Power Plus Communications AG • Dudenstrasse 6 • 68167 Mannheim • Deutschland • www.ppc-ag.de Security Target SMGW Version 2.1.1 page 2 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Version History 1 Version Datum Name Änderungen 1.3 28.06.2024 C. Miller SMGW 2.1.1 page 3 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Contents 2 Contents.............................................................................................................3 3 1 Introduction.................................................................................................6 4 1.1 ST reference........................................................................................................... 6 5 1.2 TOE reference ........................................................................................................ 7 6 1.3 Introduction.......................................................................................................... 10 7 1.4 TOE Overview ...................................................................................................... 12 8 1.4.1 Introduction ...................................................................................................................... 12 9 1.4.2 Overview of the Gateway in a Smart Metering System ................................................ 13 10 1.4.3 TOE description................................................................................................................ 16 11 1.4.4 TOE Type definition ......................................................................................................... 17 12 1.4.5 TOE logical boundary ...................................................................................................... 20 13 1.4.6 The logical interfaces of the TOE ................................................................................... 28 14 1.4.7 The cryptography of the TOE and its Security Module ................................................ 29 15 TOE life-cycle ................................................................................................................................ 33 16 2 Conformance Claims................................................................................34 17 2.1 CC Conformance Claim....................................................................................... 34 18 2.2 PP Claim / Conformance Statement ................................................................... 34 19 2.3 Package Claim ..................................................................................................... 34 20 2.4 Conformance Claim Rationale ............................................................................ 34 21 3 Security Problem Definition.....................................................................35 22 3.1 External entities ................................................................................................... 35 23 3.2 Assets................................................................................................................... 35 24 3.3 Assumptions........................................................................................................ 39 25 3.4 Threats.................................................................................................................. 41 26 3.5 Organizational Security Policies......................................................................... 44 27 4 Security Objectives ..................................................................................46 28 4.1 Security Objectives for the TOE ......................................................................... 46 29 4.2 Security Objectives for the Operational Environment....................................... 51 30 4.3 Security Objective Rationale............................................................................... 53 31 4.3.1 Overview ........................................................................................................................... 53 32 4.3.2 Countering the threats..................................................................................................... 54 33 4.3.3 Coverage of organisational security policies ............................................................... 57 34 4.3.4 Coverage of assumptions ............................................................................................... 58 35 5 Extended Component definition .............................................................60 36 5.1 Communication concealing (FPR_CON) ............................................................ 60 37 5.2 Family behaviour ................................................................................................. 60 38 5.3 Component levelling............................................................................................ 60 39 5.4 Management......................................................................................................... 60 40 5.5 Audit ..................................................................................................................... 60 41 5.6 Communication concealing (FPR_CON.1) ......................................................... 60 42 6 Security Requirements.............................................................................62 43 6.1 Overview............................................................................................................... 62 44 page 4 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2 Class FAU: Security Audit................................................................................... 66 45 6.2.1 Introduction ...................................................................................................................... 66 46 6.2.2 Security Requirements for the System Log .................................................................. 68 47 6.2.3 Security Requirements for the Consumer Log ............................................................. 71 48 6.2.4 Security Requirements for the Calibration Log ............................................................ 74 49 6.2.5 Security Requirements that apply to all logs ................................................................ 79 50 6.3 Class FCO: Communication................................................................................ 81 51 6.3.1 Non-repudiation of origin (FCO_NRO)........................................................................... 81 52 6.4 Class FCS: Cryptographic Support .................................................................... 82 53 6.4.1 Cryptographic support for TLS....................................................................................... 82 54 6.4.2 Cryptographic support for CMS ..................................................................................... 83 55 6.4.3 Cryptographic support for Meter communication encryption .................................... 85 56 6.4.4 General Cryptographic support...................................................................................... 87 57 6.5 Class FDP: User Data Protection........................................................................ 90 58 6.5.1 Introduction to the Security Functional Policies .......................................................... 90 59 6.5.2 Gateway Access SFP....................................................................................................... 90 60 6.5.3 Firewall SFP...................................................................................................................... 92 61 6.5.4 Meter SFP.......................................................................................................................... 95 62 6.5.5 General Requirements on user data protection............................................................ 99 63 6.6 Class FIA: Identification and Authentication ................................................... 100 64 6.6.1 User Attribute Definition (FIA_ATD) ............................................................................. 100 65 6.6.2 Authentication Failures (FIA_AFL) ............................................................................... 101 66 6.6.3 User Authentication (FIA_UAU) .................................................................................... 101 67 6.6.4 User identification (FIA_UID) ........................................................................................ 103 68 6.6.5 User-subject binding (FIA_USB)................................................................................... 104 69 6.7 Class FMT: Security Management .................................................................... 105 70 6.7.1 Management of the TSF................................................................................................. 105 71 6.7.2 Security management roles (FMT_SMR) ..................................................................... 112 72 6.7.3 Management of security attributes for Gateway access SFP.................................... 113 73 6.7.4 Management of security attributes for Firewall SFP .................................................. 114 74 6.7.5 Management of security attributes for Meter SFP ...................................................... 115 75 6.8 Class FPR: Privacy ............................................................................................ 116 76 6.8.1 Communication Concealing (FPR_CON) ..................................................................... 116 77 6.8.2 Pseudonymity (FPR_PSE)............................................................................................. 117 78 6.9 Class FPT: Protection of the TSF ..................................................................... 118 79 6.9.1 Fail secure (FPT_FLS).................................................................................................... 118 80 6.9.2 Replay Detection (FPT_RPL)......................................................................................... 119 81 6.9.3 Time stamps (FPT_STM) ............................................................................................... 119 82 6.9.4 TSF self test (FPT_TST)................................................................................................. 119 83 6.9.5 TSF physical protection (FPT_PHP)............................................................................. 120 84 6.10 Class FTP: Trusted path/channels.................................................................... 120 85 6.10.1 Inter-TSF trusted channel (FTP_ITC)............................................................................ 120 86 page 5 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.11 Security Assurance Requirements for the TOE............................................... 122 87 6.12 Security Requirements rationale ...................................................................... 124 88 6.12.1 Security Functional Requirements rationale............................................................... 124 89 6.12.2 Security Assurance Requirements rationale .............................................................. 137 90 7 TOE Summary Specification..................................................................138 91 7.1 SF.1: Authentication of Communication and Role Assignment for external 92 entities............................................................................................................................ 138 93 7.2 SF.2: Acceptance and Deposition of Meter Data, Encryption of Meter Data for 94 WAN transmission......................................................................................................... 145 95 7.3 SF.3: Administration, Configuration and SW Update...................................... 147 96 7.4 SF.4: Displaying Consumption Data................................................................. 149 97 7.5 SF.5: Audit and Logging.................................................................................... 150 98 7.6 SF.6: TOE Integrity Protection .......................................................................... 152 99 7.7 TSS Rationale..................................................................................................... 153 100 8 List of Tables...........................................................................................157 101 9 List of Figures .........................................................................................158 102 10 Appendix ..............................................................................................159 103 10.1 Mapping from English to German terms .......................................................... 159 104 10.2 Glossary ............................................................................................................. 161 105 11 Literature..............................................................................................166 106 107 page 6 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 1 Introduction 108 1.1ST reference 109 Title: Security Target, SMGW Version 2.1.1 110 Editors: Power Plus Communications AG 111 CC-Version: 3.1 Revision 5 112 Assurance Level: EAL 4+, augmented by AVA_VAN.5 and ALC_FLR.2 113 General Status: Final 114 Document Version: 1.3 115 Document Date: 28.06.2024 116 TOE: SMGW Version 2.1.1 117 Certification ID: BSI-DSZ-CC-0831-V9-2023 118 This document contains the security target of the SMGW Version 2.1.1. 119 This security target claims conformance to the Smart Meter Gateway protection profile 120 [PP_GW]. 121 122 page 7 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 1.2TOE reference 123 The TOE described in this security target is the SMGW Version 2.1.1. 124 The following classifications of the product “Smart Meter Gateway” contain the TOE: 125 • BPL Smart Meter Gateway (BPL-SMGW), SMGW-B-2A-111-00, SMGW-B-2B- 126 111-00, SMGW-H-2B-111-00 127 • ETH Smart Meter Gateway (ETH-SMGW), SMGW-E-2A-111-00, SMGW-E-2B- 128 111-00 129 • LTE Smart Meter Gateway (LTE-SMGW), SMGW-J-2A-111-10, SMGW-J-2A- 130 111-30, SMGW-K-2A-111-10 or SMGW-K-2A-111-30, SMGW-J-2B-111-10, 131 SMGW-J-2B-111-30, SMGW-K-2B-111-10 or SMGW-K-2B-111-30 132 • G.hn Smart Meter Gateway (G.hn-SMGW), SMGW-N-2A-111-00, SMGW-N- 133 2B-111-00 134 • LTE450 Smart Meter Gateway (LTE450-SMGW), SMGW-V-2A-111-20, 135 SMGW-V-2B-111-20 136 • pWE Smart Meter Gateway (pWE-SMGW), SMGW-P-2A-111-00, SMGW-P- 137 2B-111-00 138 The TOE comprises the following parts: 139 • hardware device of the hardware generation 2A or 2B according to Table 1, 140 including the TOE’s main circuit board, a carrier board, a power-supply unit and 141 a radio module for communication with wireless meter (included in the hardware 142 device “Smart Meter Gateway”) 143 • firmware including software application (loaded into the circuit board) 144 o “SMGW Software Version 2.2.1”, identified by the value 00902-34801 145 which comprises of two revision numbers of the underlying version control sys- 146 tem for the TOE, where the first part is for the operating system and the second 147 part is for the SMGW application 148 • manuals 149 o „Handbuch für Verbraucher, Smart Meter Gateway“ [AGD_CON- 150 SUMER], identified by the SHA-256 hash value 151 4816009774a634d207edb00ca6408bb28c26daf2c6c9185ced1f1215088a02e4 152 o „Handbuch für Service-Techniker, Smart Meter Gateway“ [AGD_Techni- 153 ker], identified by the SHA-256 hash value 154 1be4058c8db43bcf730387c9f14f0e87bc84db5520815804daaf8f5de1ed6c5a 155 page 8 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland o „Handbuch für Hersteller von Smart-Meter Gateway-Administrations- 156 Software, Smart Meter Gateway“ [AGD_GWA], identified by the SHA- 157 256 hash value 158 4c2e9765853136121c370f7ba6bf9c5e969a704020153e065f9dad1977c9f586 159 o „Logmeldungen, SMGW “ [SMGW_Logging] identified by the SHA-256 160 hash value 161 f3a935b6ae1713ccdaa02411b377377a8e4f7dfb092a181efe1a6c9a86f17a64 162 o „Auslieferungs- und Fertigungsprozeduren, Anhang Sichere Ausliefe- 163 rung“ [AGD_SEC], identified by the SHA-256 hash value 164 17e280428e1602759b7bfa7dbbfde2e8d65ad7d518a96f0ab41a7130a9f38205 165 The hardware device “Smart Meter Gateway” includes a secure module with the product 166 name “TCOS Smart Meter Security Module Version 1.0 Release 2/P60C144PVE” which 167 is not part of the TOE but has its own certification id “BSI-DSZ-CC-0957-V2-2016”. More- 168 over, a hard-wired communication adapter is connected to the TOE via [USB] as shown 169 in Figure 3 which is not part of the TOE (but always an inseparable part of the delivered 170 entity). This communication adapter can be either a LTE communication adapter, a 171 LTE450 communication adapter, a BPL [IEEE 1901] communication adapter, a GPRS 172 communication adapter, a CDMA communication adapter, a powerWAN-Ethernet com- 173 munication adapter, a G.hn [ITU G.hn] communication adapter or an ethernet commu- 174 nication adapter. There might be not every communication adapter available for each 175 Hardware Generation. 176 The following table shows the different “Smart Meter Gateway” product classifications 177 applied on the case of the product, while not all of them might be part of the TOE: 178 # Characteristic Value Description 1 Product family SMGW each classification of a type start with this value 2 - Delimiter 3 Communication Technology B Product Type „BPL Smart Meter Gateway“ H Product Type “BPL Smart Meter Gateway” C Product Type „CDMA Smart Meter Gateway“ E Product Type „ETH Smart Meter Gateway“ page 9 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland # Characteristic Value Description G Product Type „GPRS Smart Meter Gateway“ L Product Type „LTE Smart Meter Gateway“ J Product Type “LTE Smart Meter Gateway” K Product Type „LTE Smart Meter Gateway“ P Product Type „powerWAN-ETH Smart Meter Gateway“ N Product Type „G.hn Smart Meter Gateway“ V Product Type “LTE450 Smart Meter Gateway” 4 - Delimiter 5 Hardware gen- eration 1A Identification of hardware generation; version 1.0 of “SMGW Hardware” 1B Identification of hardware generation; version 1.0.1 of “SMGW Hardware” (with new power adapter) 2A Identification of hardware generation; version 2.0 of “SMGW Hardware” 2B Identification of hardware generation; version 2B of “SMGW Hardware” 6 - Delimiter 7 HAN Interface 1 Ethernet 8 CLS Interface 1 Ethernet 9 LMN Interface 1 Wireless and wired page 10 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland # Characteristic Value Description 10 - Delimiter 11 SIM card type 0 None 1 SIM card assembled at factory and SIM slot 2 SIM card assembled at factory only 3 SIM slot only 12 reserved 0 Table 1: Smart Meter Gateway product classifications 179 1.3Introduction 180 The increasing use of green energy and upcoming technologies around e-mobility lead 181 to an increasing demand for functions of a so called smart grid. A smart grid hereby 182 refers to a commodity 1 network that intelligently integrates the behaviour and actions of 183 all entities connected to it – suppliers of natural resources and energy, its consumers 184 and those that are both – in order to efficiently ensure a more sustainable, economic and 185 secure supply of a certain commodity (definition adopted from [CEN]). 186 In its vision such a smart grid would allow to invoke consumer devices to regulate the 187 load and availability of resources or energy in the grid, e.g. by using consumer devices 188 to store energy or by triggering the use of energy based upon the current load of the 189 grid2. Basic features of such a smart use of energy or resources are already reality. 190 Providers of electricity in Germany, for example, have to offer at least one tariff that has 191 the purpose to motivate the consumer to save energy. 192 In the past, the production of electricity followed the demand/consumption of the con- 193 sumers. Considering the strong increase in renewable energy and the production of en- 194 ergy as a side effect in heat generation today, the consumption/demand has to follow 195 1 Commodities can be electricity, gas, water or heat which is distributed from its generator to the consumer through a grid (network). 2 Please note that such a functionality requires a consent or a contract between the supplier and the consumer, alterna- tively a regulatory requirement. page 11 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland the – often externally controlled – production of energy. Similar mechanisms can exist 196 for the gas network to control the feed of biogas or hydrogen based on information sub- 197 mitted by consumer devices. 198 An essential aspect for all considerations of a smart grid is the so called Smart Metering 199 System that meters the consumption or production of certain commodities at the con- 200 sumers’ side and allows sending the information about the consumption or production to 201 external entities, which is then the basis for e. g. billing the consumption or production. 202 This Security Target defines the security objectives, corresponding requirements and 203 their fulfilment for a Gateway which is the central communication component of such a 204 Smart Metering System (please refer to chapter 1.4.2 for a more detailed overview). 205 The Target of Evaluation (TOE) that is described in this document is an electronic unit 206 comprising hardware and software/firmware3 used for collection, storage and provision 207 of Meter Data4 from one or more Meters of one or multiple commodities. 208 The Gateway connects a Wide Area Network (WAN) with a Network of Devices of one 209 or more Smart Metering devices (Local Metrological Network, LMN) and the consumer 210 Home Area Network (HAN), which hosts Controllable Local Systems (CLS) and visuali- 211 zation devices. The security functionality of the TOE comprises 212 • protection of confidentiality, authenticity, integrity of data and 213 • information flow control 214 mainly to protect the privacy of consumers, to ensure a reliable billing process and to 215 protect the Smart Metering System and a corresponding large scale infrastructure of the 216 smart grid. The availability of the Gateway is not addressed by this ST. 217 218 3 For the rest of this document the term “firmware” will be used if the complete firmware ist meant. For the application in- cluding its services the term “software” will be used. 4 Please refer to chapter 3.2 for an exact definition of the term "Meter Data”. page 12 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 1.4TOE Overview 219 1.4.1 Introduction 220 The TOE as defined in this Security Target is the Gateway in a Smart Metering System. 221 In the following subsections the overall Smart Metering System will be described first 222 and afterwards the Gateway itself. 223 There are various different vocabularies existing in the area of Smart Grid, Smart Meter- 224 ing and Home Automation. Furthermore, the Common Criteria maintain their own vo- 225 cabulary. The Protection Profile [PP_GW, chapter 1.3] provides an overview over the 226 most prominent terms used in this Security Target to avoid any bias which is not fully 227 repeated here. 228 page 13 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 1.4.2 Overview of the Gateway in a Smart Metering System 229 The following figure provides an overview of the TOE as part of a complete Smart Me- 230 tering System from a purely functional perspective as used in this ST.5 231 232 Figure 1: The TOE and its direct environment 233 234 As can be seen in Figure 1, a system for smart metering comprises different functional 235 units in the context of the descriptions in this ST: 236 • The Gateway (as defined in this ST) serves as the communication component 237 between the components in the local area network (LAN) of the consumer and 238 the outside world. It can be seen as a special kind of firewall dedicated to the 239 smart metering functionality. It also collects, processes and stores the records 240 5 It should be noted that this description purely contains aspects that are relevant to motivate and understand the function- alities of the Gateway as described in this ST. It does not aim to provide a universal description of a Smart Metering Sys- tem for all application cases. page 14 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland from Meter(s) and ensures that only authorised parties have access to them or 241 derivatives thereof. Before sending meter data6 the information will be en- 242 crypted and signed using the services of a Security Module. The Gateway fea- 243 tures a mandatory user interface, enabling authorised consumers to access the 244 data relevant to them. 245 • The Meter itself records the consumption or production of one or more com- 246 modities (e.g. electricity, gas, water, heat) and submits those records in defined 247 intervals to the Gateway. The Meter Data has to be signed and encrypted be- 248 fore transfer in order to ensure its confidentiality, authenticity, and integrity. The 249 Meter is comparable to a classical meter7 and has comparable security require- 250 ments; it will be sealed as classical meters according to the regulations of the 251 calibration authority. The Meter further supports the encryption and integrity 252 protection of its connection to the Gateway8. 253 • The Gateway utilises the services of a Security Module (e.g. a smart card) as 254 a cryptographic service provider and as a secure storage for confidential assets. 255 The Security Module will be evaluated separately according to the requirements 256 in the corresponding Protection Profile (c.f. [SecModPP]). 257 Controllable Local Systems (CLS, as shown in Figure 2) may range from local power 258 generation plants, controllable loads such as air condition and intelligent household ap- 259 pliances (“white goods”) to applications in home automation. CLS may utilise the ser- 260 vices of the Gateway for communication services. However, CLS are not part of the 261 Smart Metering System. 262 The following figure introduces the external interfaces of the TOE and shows the cardi- 263 nality of the involved entities. Please note that the arrows of the interfaces within the 264 Smart Metering System as shown in Figure 2 indicate the flow of information. However, 265 it does not indicate that a communication flow can be initiated bi-directionally. Indeed, 266 6 Please note that readings and data which are not relevant for billing may require an explicit endorsement of the consumer. 7 In this context, a classical meter denotes a meter without a communication channel, i.e. whose values have to be read out locally. 8 It should be noted that this ST does not imply that the connection between the Gateways and external components (specifically meters and CLS) is cable based. It is also possible that the connections as shown in Figure 1 are realised deploying a wireless technology. However, the requirements on how the connections shall be secured apply regardless of the realisation. page 15 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland the following chapters of this ST will place dedicated requirements on the way an infor- 267 mation flow can be initiated9. 268 269 Figure 2: The logical interfaces of the TOE 270 The overview of the Smart Metering System as described before is based on a threat 271 model that has been developed for the Smart Metering System and has been motivated 272 by the following considerations: 273 • The Gateway is the central communication unit in the Smart Metering System. 274 It is the only unit directly connected to the WAN, to be the first line of defence 275 an attacker located in the WAN would have to conquer. 276 • The Gateway is the central component that collects, processes and stores Me- 277 ter Data. It therewith is the primary point for user interaction in the context of 278 the Smart Metering System. 279 9 Please note that the cardinality of the interface to the consumer is 0...n as it cannot be assumed that a consumer is interacting with the TOE at all. page 16 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland • To conquer a Meter in the LMN or CLS in the HAN (that uses the TOE for com- 280 munication) a WAN attacker first would have to attack the Gateway success- 281 fully. All data transferred between LAN and WAN flows via the Gateway which 282 makes it an ideal unit for implementing significant parts of the system's overall 283 security functionality. 284 • Because a Gateway can be used to connect and protect multiple Meters (while 285 a Meter will always be connected to exactly one Gateway) and CLS with the 286 WAN, there might be more Meters and CLS in a Smart Metering System than 287 there are Gateways. 288 All these arguments motivated the approach to have a Gateway (using a Security Mod- 289 ule for cryptographic support), which is rich in security functionality, strong and evaluated 290 in depth, in contrast to a Meter which will only deploy a minimum of security functions. 291 The Security Module will be evaluated separately. 292 1.4.3 TOE description 293 The Smart Metering Gateway (in the following short: Gateway or TOE) may serve as the 294 communication unit between devices of private and commercial consumers and service 295 providers of a commodity industry (e.g. electricity, gas, water, etc.). It also collects, pro- 296 cesses and stores Meter Data and is responsible for the distribution of this data to ex- 297 ternal entities. 298 Typically, the Gateway will be placed in the household or premises of the consumer10 of 299 the commodity and enables access to local Meter(s) (i.e. the unit(s) used for measuring 300 the consumption or production of electric power, gas, water, heat etc.) and may enable 301 access to Controllable Local Systems (e.g. power generation plants, controllable loads 302 such as air condition and intelligent household appliances). 303 The TOE has a fail-safe design that specifically ensures that any malfunction can not 304 impact the delivery of a commodity, e.g. energy, gas or water11. 305 306 10 Please note that it is possible that the consumer of the commodity is not the owner of the premises where the Gateway will be placed. However, this description acknowledges that there is a certain level of control over the physical access to the Gateway. 11 Indeed, this Security Target assumes that the Gateway and the Meters have no possibility at all to impact the delivery of a commodity. Even an intentional stop of the delivery of a certain commodity is Not within the scope of this Security Target. It should, however, be noted that such a functionality may be realised by a CLS that utilises the services of the TOE for its communication. page 17 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland The following figure provides an overview of the product with its TOE and non-TOE parts: 307 308 Figure 3: The product with its TOE and non-TOE parts 309 The TOE communicates over the interface IF_GW_SM with a security module and over 310 the interfaces USB_P, USB_N and Module Reset with one of the possible communica- 311 tion adapters according to chapter 1.2. The communication adapters, which are not part 312 of the TOE, transmit data from the USB interface to the WAN interface and vice versa. 313 1.4.4 TOE Type definition 314 At first, the TOE is a communication Gateway. It provides different external communica- 315 tion interfaces and enables the data communication between these interfaces and con- 316 nected IT systems. It further collects, processes and stores Meter Data and is responsi- 317 ble for the distribution of this data to external parties. 318 Typically, the Gateway will be placed in the household or premises of the consumer of 319 the commodity and enables access to local Meter(s) (i.e. the unit(s) used for measuring 320 the consumption or production of electric power, gas, water, heat etc.) and may enable 321 access to Controllable Local Systems (e.g. power generation plants, controllable loads 322 such as air condition and intelligent household appliances). Roles respectively External 323 Entities in the context of the TOE are introduced in chapter 3.1. 324 The TOE described in this ST is a product that has been developed by Power Plus Com- 325 munication AG. It is a communication product which complies with the requirements of 326 the Protection Profile “Protection Profile for the Gateway of a Smart Metering System” 327 page 18 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland [PP_GW]. The TOE consists of hardware and software including the operating system. 328 The communication with more than one meter is possible. 329 The TOE is implemented as a separate physical module which can be integrated into 330 more complex modular systems. This means that the TOE can be understood as an 331 OEM module which provides all required physical interfaces and protocols on well de- 332 fined interfaces. Because of this, the module can be integrated into communication de- 333 vices and directly into meters. 334 The TOE-design includes the following components: 335 • The security relevant components compliant to the Protection Profile. 336 • Components with no security relevance (e.g. communication protocols and in- 337 terfaces). 338 The TOE evaluation does not include the evaluation of the Security Module. In fact, the 339 TOE relies on the security functionality of the Security Module but it must be security 340 evaluated in a separate security evaluation12. 341 The hardware platform of the TOE mainly consists of a suitable embedded CPU, volatile 342 and non-volatile memory and supporting circuits like Security Module and RTC. 343 The TOE contains mechanisms for the integrity protection for its firmware. 344 The TOE supports the following communication protocols: 345 • OBIS according to [IEC-62056-6-1] and [EN 13757-1], 346 • DLMS/COSEM according to [IEC-62056-6-2], 347 • SML according to [IEC-62056-5-3-8], 348 • unidirectional and bidirectional wireless M-Bus according to [EN 13757-3], 349 [EN 13757-4], and [IEC-62056-21]. 350 351 12 Please note that the Security Module is physically integrated into the Gateway even though it is not part of the TOE. page 19 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland The TOE provides the following physical interfaces for communication 352 • Wireless M-Bus (LMN) according to [EN 13757-3], 353 • RS-485 (LMN) according to [EIA RS-485], 354 • Ethernet (HAN) according to [IEEE 802.3], and 355 • USB (WAN) according to [USB]. 356 The physical interface for the WAN communication is described in chapter 1.4.3. The 357 communication is protected according to [TR-03109]. 358 The communication into the HAN is also provided by the Ethernet interface. The proto- 359 cols HTTPS and TLS proxy are therefore supported. 360 361 Figure 4: The TOE’s protocol stack 362 The TOE provides the following functionality: 363 • Protected handling of Meter Data compliant to [PP_GW, chapter 1.4.6.1 and 364 1.4.6.2] 365 • Integrity and authenticity protection e. g. of Meter Data compliant to [PP_GW, 366 chapter 1.6.4.3] 367 • Protection of LAN devices against access from the WAN compliant to [PP_GW, 368 chapter 1.4.6.4] 369 • Wake-Up Service compliant to [PP_GW, chapter 1.4.6.5] 370 • Privacy protection compliant to [PP_GW, chapter 1.4.6.6] 371 • Management of Security Functions compliant to [PP_GW, chapter 1.4.6.7] 372 page 20 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland • Cryptography of the TOE and its Security Module compliant to [PP_GW, chap- 373 ter 1.4.8] 374 1.4.5 TOE logical boundary 375 The logical boundary of the Gateway can be defined by its security features: 376 • Handling of Meter Data, collection and processing of Meter Data, submission 377 to authorised external entities (e.g. one of the service providers involved) where 378 necessary protected by a digital signature 379 • Protection of authenticity, integrity and confidentiality of data temporarily or per- 380 sistently stored in the Gateway, transferred locally within the LAN and trans- 381 ferred in the WAN (between Gateway and authorised external entities) 382 • Firewalling of information flows to the WAN and information flow control among 383 Meters, Controllable Local Systems and the WAN 384 • A Wake-Up-Service that allows to contact the TOE from the WAN side 385 • Privacy preservation 386 • Management of Security Functionality 387 • Identification and Authentication of TOE users 388 The following sections introduce the security functionality of the TOE in more detail. 389 1.4.5.1 Handling of Meter Data13 390 The Gateway is responsible for handling Meter Data. It receives the Meter Data from the 391 Meter(s), processes it, stores it and submits it to external entities. 392 The TOE utilises Processing Profiles to determine which data shall be sent to which 393 component or external entity. A Processing Profile defines: 394 • how Meter Data must be processed, 395 • which processed Meter Data must be sent in which intervals, 396 • to which component or external entity, 397 • signed using which key material, 398 • encrypted using which key material, 399 • whether processed Meter Data shall be pseudonymised or not, and 400 • which pseudonym shall be used to send the data. 401 13 Please refer to chapter 3.2 for an exact definition of the various data types. page 21 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland The Processing Profiles are not only the basis for the security features of the TOE; they 402 also contain functional aspects as they indicate to the Gateway how the Meter Data shall 403 be processed. More details on the Processing Profiles can be found in [TR-03109-1]. 404 The Gateway restricts access to (processed) Meter Data in the following ways: 405 • consumers must be identified and authenticated first before access to any data 406 may be granted, 407 • the Gateway accepts Meter Data from authorised Meters only, 408 • the Gateway sends processed Meter Data to correspondingly authorised exter- 409 nal entities only. 410 The Gateway accepts data (e.g. configuration data, firmware updates) from correspond- 411 ingly authorised Gateway Administrators or correspondingly authorised external entities 412 only. This restriction is a prerequisite for a secure operation and therewith for a secure 413 handling of Meter Data. Further, the Gateway maintains a calibration log with all relevant 414 events that could affect the calibration of the Gateway. 415 These functionalities: 416 • prevent that the Gateway accepts data from or sends data to unauthorised en- 417 tities, 418 • ensure that only the minimum amount of data leaves the scope of control of the 419 consumer, 420 • preserve the integrity of billing processes and as such serve in the interests of 421 the consumer as well as in the interests of the supplier. Both parties are inter- 422 ested in an billing process that ensures that the value of the consumed amount 423 of a certain commodity (and only the used amount) is transmitted, 424 • preserve the integrity of the system components and their configurations. 425 The TOE offers a local interface to the consumer (see also IF_GW_CON in Figure 2) 426 and allows the consumer to obtain information via this interface. This information com- 427 prises the billing-relevant data (to allow the consumer to verify an invoice) and infor- 428 mation about which Meter Data has been and will be sent to which external entity. The 429 TOE ensures that the communication to the consumer is protected by using TLS and 430 ensures that consumers only get access to their own data. Therefore, the TOE contains 431 a web server that delivers the content to the web browser after successful authentication 432 of the user. 433 page 22 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 1.4.5.2 Confidentiality protection 434 The TOE protects data from unauthorised disclosure 435 • while received from a Meter via the LMN, 436 • while received from the administrator via the WAN, 437 • while temporarily stored in the volatile memory of the Gateway, 438 • while transmitted to the corresponding external entity via the WAN or HAN. 439 Furthermore, all data, which no longer have to be stored in the Gateway, are securely 440 erased to prevent any form of access to residual data via external interfaces of the TOE. 441 These functionalities protect the privacy of the consumer and prevent that an unauthor- 442 ised party is able to disclose any of the data transferred in and from the Smart Metering 443 System (e.g. Meter Data, configuration settings). 444 The TOE utilises the services of its Security Module for aspects of this functionality. 445 1.4.5.3 Integrity and Authenticity protection 446 The Gateway provides the following authenticity and integrity protection: 447 • Verification of authenticity and integrity when receiving Meter Data from a Meter 448 via the LMN, to verify that the Meter Data have been sent from an authentic 449 Meter and have not been altered during transmission. The TOE utilises the ser- 450 vices of its Security Module for aspects of this functionality. 451 • Application of authenticity and integrity protection measures when sending pro- 452 cessed Meter Data to an external entity, to enable the external entity to verify 453 that the processed Meter Data have been sent from an authentic Gateway and 454 have not been changed during transmission. The TOE utilises the services of 455 its Security Module for aspects of this functionality. 456 • Verification of authenticity and integrity when receiving data from an external 457 entity (e.g. configuration settings or firmware updates) to verify that the data 458 have been sent from an authentic and authorised external entity and have not 459 been changed during transmission. The TOE utilises the services of its Security 460 Module for aspects of this functionality. 461 These functionalities 462 • prevent within the Smart Metering System that data may be sent by a non- 463 authentic component without the possibility that the data recipient can detect 464 this, 465 page 23 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland • facilitate the integrity of billing processes and serve for the interests of the con- 466 sumer as well as for the interest of the supplier. Both parties are interested in 467 the transmission of correct processed Meter Data to be used for billing, 468 • protect the Smart Metering System and a corresponding large scale Smart Grid 469 infrastructure by preventing that data (e.g. Meter Data, configuration settings, 470 or firmware updates) from forged components (with the aim to cause damage 471 to the Smart Grid) will be accepted in the system. 472 1.4.5.4 Information flow control and firewall 473 The Gateway separates devices in the LAN of the consumer from the WAN and enforces 474 the following information flow control to control the communication between the networks 475 that the Gateway is attached to: 476 • only the Gateway may establish a connection to an external entity in the WAN14; 477 specifically connection establishment by an external entity in the WAN or a Me- 478 ter in the LMN to the WAN is not possible, 479 • the Gateway can establish connections to devices in the LMN or in the HAN, 480 • Meters in the LMN are only allowed to establish a connection to the Gateway, 481 • the Gateway shall offer a wake-up service that allows external entities in the 482 WAN to trigger a connection establishment by the Gateway, 483 • connections are allowed to pre-configured addresses only, 484 • only cryptographically-protected (i.e. encrypted, integrity protected and mutu- 485 ally authenticated) connections are possible.15 486 These functionalities 487 • prevent that the Gateway itself or the components behind the Gateway (i.e. 488 Meters or Controllable Local Systems) can be conquered by a WAN attacker 489 (as defined in section 3.4), that processed data are transmitted to the wrong 490 external entity, and that processed data are transmitted without being confi- 491 dentiality/authenticity/integrity-protected, 492 • protect the Smart Metering System and a corresponding large scale infrastruc- 493 ture in two ways: by preventing that conquered components will send forged 494 14 Please note that this does not affect the functionality for a CLS to establish a secure channel to a party in the WAN. Technically however, this channel is established by the TOE who acts as a proxy between the CLS and the WAN. 15 To establish an encrypted channel the TOE may use the required protocols such as DHCP or PPP. Beside the establishment of an encrypted channel no unprotected communication between the TOE and external entities located in the WAN or LAN is allowed. page 24 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Meter Data (with the aim to cause damage to the Smart Grid), and by preventing 495 that widely distributed Smart Metering Systems can be abused as a platform 496 for malicious software/firmware to attack other systems in the WAN (e.g. a WAN 497 attacker who would be able to install a botnet on components of the Smart Me- 498 tering System). 499 The communication flows that are enforced by the Gateway between parties in the HAN, 500 LMN and WAN are summarized in the following table16: 501 Table 2: Communication flows between devices in different networks 502 For communications within the different networks the following assumptions are defined: 503 1. Communications within the WAN are not restricted. However, the Gateway is 504 not involved in this communication, 505 2. No communications between devices in the LMN are assumed. Devices in the 506 LMN may only communicate to the Gateway and shall not be connected to any 507 other network, 508 3. Devices in the HAN may communicate with each other. However, the Gateway 509 is not involved in this communication. If devices in the HAN have a separate 510 16 Please note that this table only addresses the communication flow between devices in the various networks attached to the Gateway. It does not aim to provide an overview over the services that the Gateway itself offers to those devices nor an overview over the communication between devices in the same network. This information can be found in the paragraphs following the table. 17 The channel to the external entity in the WAN is established by the Gateway. Source(1st column) Destination (1st row) WAN LMN HAN WAN - (see following list) No connection establishment allowed No connection establishment allowed LMN No connection establishment allowed - (see following list) No connection establishment allowed HAN Connection establishment is allowed to trustworthy, pre-configured endpoints and via an encrypted channel only17 No connection establishment allowed - (see following list) page 25 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland connection to parties in the WAN (beside the Gateway) this connection is as- 511 sumed to be appropriately protected. It should be noted that for the case that a 512 TOE connects to more than one HAN communications between devices within 513 different HAN via the TOE are only allowed if explicitly configured by a Gateway 514 Administrator. 515 Finally, the Gateway itself offers the following services within the various networks: 516 • the Gateway accepts the submission of Meter Data from the LMN, 517 • the Gateway offers a wake-up service at the WAN side as described in chapter 518 1.4.6.5 of [PP_GW], 519 • the Gateway offers a user interface to the HAN that allows CLS or consumers 520 to connect to the Gateway in order to read relevant information. 521 1.4.5.5 Wake-Up-Service 522 In order to protect the Gateway and the devices in the LAN against threats from the WAN 523 side the Gateway implements a strict firewall policy and enforces that connections with 524 external entities in the WAN shall only be established by the Gateway itself (e.g. when 525 the Gateway delivers Meter Data or contacts the Gateway Administrator to check for 526 updates)18. 527 While this policy is the optimal policy from a security perspective, the Gateway 528 Administrator may want to facilitate applications in which an instant communication to 529 the Gateway is required. 530 In order to allow this kind of re-activeness of the Gateway, this ST allows the Gateway 531 to keep existing connections to external entities open (please refer to [TR-03109-3] for 532 more details) and to offer a so called wake-up service. 533 The Gateway is able to receive a wake-up message that is signed by the Gateway 534 Administrator. The following steps are taken: 535 1. The Gateway verifies the wake-up packet. This comprises 536 i. a check if the header identification is correct, 537 ii. the recipient is the Gateway, 538 iii. the wake-up packet has been sent/received within an acceptable period 539 of time in order to prevent replayed messages, 540 18 Please note that this does not affect the functionality for a CLS to establish a secure channel to a party in the WAN. Technically however, this channel is established by the TOE who acts as a proxy between the CLS and the WAN. page 26 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland iv. the wake-up message has not been received before, 541 2. If the wake-up message could not be verified as described in step #1, the 542 message will be dropped/ignored. No further operations will be initiated and no 543 feedback is provided. 544 3. If the message could be verified as described in step #1, the signature of the 545 wake-up message will be verified. The Gateway uses the services of its Security 546 Module for signature verification. 547 4. If the signature of the wake-up message cannot be verified as described in step 548 #3 the message will be dropped/ignored. No feedback is given to the sending 549 external entity and the wake-up sequence terminates. 550 5. If the signature of the wake-up message could be verified successfully , the 551 Gateway initiates a connection to a pre-configured external entity; however no 552 feedback is given to the sending external entity. 553 More details on the exact implementation of this mechanism can be found in [TR-03109- 554 1, „Wake-Up Service“]. 555 1.4.5.6 Privacy Preservation 556 The preservation of the privacy of the consumer is an essential aspect that is imple- 557 mented by the functionality of the TOE as required by this ST. 558 This contains two aspects: 559 The Processing Profiles that the TOE obeys facilitate an approach in which only a mini- 560 mum amount of data have to be submitted to external entities and therewith leave the 561 scope of control of the consumer. The mechanisms “encryption” and “pseudonymisation” 562 ensure that the data can only be read by the intended recipient and only contains an 563 association with the identity of the Meter if this is necessary. 564 On the other hand, the TOE provides the consumer with transparent information about 565 the information flows that happen with their data. In order to achieve this, the TOE im- 566 plements a consumer log that specifically contains the information about the information 567 flows which has been and will be authorised based on the previous and current Pro- 568 cessing Profiles. The access to this consumer log is only possible via a local interface 569 from the HAN and after authentication of the consumer. The TOE does only allow a 570 consumer access to the data in the consumer log that is related to their own consumption 571 or production. The following paragraphs provide more details on the information that is 572 included in this log: 573 page 27 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Monitoring of Data Transfers 574 The TOE keeps track of each data transmission in the consumer log and allows the 575 consumer to see details on which information have been and will be sent (based on the 576 previous and current settings) to which external entity. 577 Configuration Reporting 578 The TOE provides detailed and complete reporting in the consumer log of each security 579 and privacy-relevant configuration setting. Additional to device specific configuration set- 580 tings, the consumer log contains the parameters of each Processing Profile. The con- 581 sumer log contains the configured addresses for internal and external entities including 582 the CLS. 583 Audit Log and Monitoring 584 The TOE provides all audit data from the consumer log at the user interface 585 IF_GW_CON. Access to the consumer log is only possible after successful authentica- 586 tion and only to information that the consumer has permission to (i.e. that has been 587 recorded based on events belonging to the consumer). 588 1.4.5.7 Management of Security Functions 589 The Gateway provides authorised Gateway Administrators with functionality to manage 590 the behaviour of the security functions and to update the TOE. 591 Further, it is defined that only authorised Gateway Administrators may be able to use 592 the management functionality of the Gateway (while the Security Module is used for the 593 authentication of the Gateway Administrator) and that the management of the Gateway 594 shall only be possible from the WAN side interface. 595 System Status 596 The TOE provides information on the current status of the TOE in the system log. Spe- 597 cifically it shall indicate whether the TOE operates normally or any errors have been 598 detected that are of relevance for the administrator. 599 1.4.5.8 Identification and Authentication 600 To protect the TSF as well as User Data and TSF data from unauthorized modification 601 the TOE provides a mechanism that requires each user to be successfully identified and 602 authenticated before allowing any other actions on behalf of that user. This functionality 603 includes the identification and authentication of users who receive data from the 604 page 28 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Gateway as well as the identification and authentication of CLS located in HAN and 605 Meters located in LMN. 606 The Gateway provides different kinds of identification and authentication mechanisms 607 that depend on the user role and the used interfaces. Most of the mechanisms require 608 the usage of certificates. Only consumers are able to decide whether they use certifi- 609 cates or username and password for identification and authentication. 610 1.4.6 The logical interfaces of the TOE 611 The TOE offers its functionality as outlined before via a set of external interfaces. Figure 612 2 also indicates the cardinality of the interfaces. The following table provides an overview 613 of the mandatory external interfaces of the TOE and provides additional information: 614 19 Please note that this interface allows consumer (or consumer’s CLS) to connect to the gateway in order to read consumer specific information. 20 Please note that an implementation of this external interface is also required in the case that Meter and Gateway are implemented within one physical device in order to allow the extension of the system by another Meter. Interface Name Description IF_GW_CON Via this interface the Gateway provides the consumer19 with the possibility to review information that is relevant for billing or the privacy of the consumer. Specifically the access to the consumer log is only allowed via this interface. IF_GW_MTR Interface between the Meter and the Gateway. The Gateway receives Meter Data via this interface.20 IF_GW_SM The Gateway invokes the services of its Security Module via this interface. IF_GW_CLS CLS may use the communication services of the Gateway via this interface. The implementation of at least one interface for CLS is mandatory. IF_GW_WAN The Gateway submits information to authorised external entities via this interface. IF_GW_SRV Local interface via which the service technician has the possibility to review information that are relevant to maintain the Gateway. Specifically he has page 29 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 3: Mandatory TOE external interfaces 615 1.4.7 The cryptography of the TOE and its Security Module 616 Parts of the cryptographic functionality used in the upper mentioned functions is provided 617 by a Security Module. The Security Module provides strong cryptographic functionality, 618 random number generation, secure storage of secrets and supports the authentication 619 of the Gateway Administrator. The Security Module is a different IT product and not part 620 of the TOE as described in this ST. Nevertheless, it is physically embedded into the 621 Gateway and protected by the same level of physical protection. The requirements 622 applicable to the Security Module are specified in a separate PP (see [SecModPP]). 623 The following table provides a more detailed overview on how the cryptographic 624 functions are distributed between the TOE and its Security Module. 625 read access to the system log only via this interface. He has also the possibility to view non-TSF data via this interface. Aspect TOE Security Module Communicatio n with external entities • encryption • decryption • hashing • key derivation • MAC generation • MAC verification • secure storage of the TLS certificates Key negotiation: • support of the authentication of the external entity • secure storage of the private key • random number generation • digital signature verification and generation Communicatio nwith the consumer • encryption • decryption • hashing • key derivation • MAC generation • MAC verification • secure storage of the TLS certificates Key negotiation: • support of the authentication of the consumer • secure storage of the private key • digital signature verification and generation • random number generation page 30 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 4: Cryptographic support of the TOE and its Security Module 626 627 1.4.7.1 Content data encryption vs. an encrypted channel 628 The TOE utilises concepts of the encryption of data on the content level as well as the 629 establishment of a trusted channel to external entities. 630 As a general rule, all processed Meter Data that is prepared to be submitted to ex- 631 ternal entities is encrypted and integrity protected on a content level using CMS (ac- 632 cording to [TR-03109-1-I]). 633 Further, all communication with external entities is enforced to happen via encrypted, 634 integrity protected and mutually authenticated channels. 635 This concept of encryption on two layers facilitates use cases in which the external 636 party that the TOE communicates with is not the final recipient of the Meter Data. In 637 Communicatio n with the Meter • encryption • decryption • hashing • key derivation • MAC generation • MAC verification • secure storage of the TLS certificates Key negotiation (in case of TLS connection): • support of the authentication of the meter • secure storage of the private key • digital signature verification and generation • random number generation Signing data before submission to an external entity • hashing Signature creation • secure storage of the private key Content data encryption and integrity protection • encryption • decryption • MAC generation • key derivation • secure storage of the public Key Key negotiation: • secure storage of the private key • random number generation page 31 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland this way, it is for example possible that the Gateway Administrator receives Meter 638 Data that they forward to other parties. In such a case, the Gateway Administrator is 639 the endpoint of the trusted channel but cannot read the Meter Data. 640 Administration data that is transmitted between the Gateway Administrator and the TOE 641 is also encrypted and integrity protected using CMS. 642 The following figure introduces the communication process between the Meter, the TOE 643 and external entities (focussing on billing-relevant Meter Data). 644 The basic information flow for Meter Data is as follows and shown in Figure 5: 645 1. The Meter measures the consumption or production of a certain commodity. 646 2. The Meter Data is prepared for transmission: 647 a. The Meter Data is typically signed (typically using the services of an 648 integrated Security Module). 649 b. If the communication between the Meter and the Gateway is performed 650 bidirectional, the Meter Data is transmitted via an encrypted and mutually 651 authenticated channel to the Gateway. Please note that the submission of 652 this information may be triggered by the Meter or the Gateway. 653 or 654 c. If a unidirectional communication is performed between the Meter and the 655 Gateway, the Meter Data is encrypted using a symmetric algorithm 656 (according to [TR-03109-3]) and facilitating a defined data structure to ensure 657 the authenticity and confidentiality. 658 3. The authenticity and integrity of the Meter Data is verified by the Gateway. 659 4. If (and only if) authenticity and integrity have been verified successfully, the 660 Meter Data is further processed by the Gateway according to the rules in the 661 Processing Profile else the cryptographic information flow will be cancelled. 662 5. The processed Meter Data is encrypted and integrity protected using CMS 663 (according to [TR-03109-1-I]) for the final recipient of the data21. 664 6. The processed Meter Data is signed using the services of the Security Module. 665 7. The processed and signed Meter Data may be stored for a certain amount of 666 time. 667 21 Optionally the Meter Data can additionally be signed before any encryption is done. page 32 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 8. The processed Meter Data is finally submitted to an authorised external entity 668 in the WAN via an encrypted and mutually authenticated channel. 669 670 Figure 5: Cryptographic information flow for distributed Meters and Gateway 671 672 page 33 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland TOE life-cycle 673 The life-cycle of the TOE can be separated into the following phases: 674 1. Development 675 2. Production 676 3. Pre-personalization at the developer's premises (without Security Module) 677 4. Pre-personalization and integration of Security Module 678 5. Installation and start of operation 679 6. Personalization 680 7. Normal operation 681 A detailed description of the phases #1 to #4 and #6 to #7 is provided in [TR-03109-1- 682 VI], while phase #5 is described in the TOE manuals. 683 The TOE will be delivered after phase “Pre-personalization and integration of Security 684 Module”. The phase “Personalization” will be performed when the TOE is started for the 685 first time after phase “Installation and start of operation”. The TOE delivery process is 686 specified in [AGD_SEC]. 687 page 34 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 2 Conformance Claims 688 2.1CC Conformance Claim 689 • This ST has been developed using Version 3.1 Revision 5 of Common Criteria 690 [CC]. 691 • This ST is [CC] part 2 extended due to the use of FPR_CON.1. 692 • This ST claims conformance to [CC] part 3; no extended assurance compo- 693 nents have been defined. 694 695 2.2PP Claim / Conformance Statement 696 This Security Target claims strict conformance to Protection Profile [PP_GW]. 697 698 2.3Package Claim 699 This Security Target claims an assurance package EAL4 augmented by AVA_VAN.5 700 and ALC_FLR.2 as defined in [CC] Part 3 for product certification. 701 702 2.4Conformance Claim Rationale 703 This Security Target claims strict conformance to only one PP [PP_GW]. 704 This Security Target is consistent to the TOE type according to [PP_GW] because the 705 TOE is a communication Gateway that provides different external communication inter- 706 faces and enables the data communication between these interfaces and connected IT 707 systems. It further collects processes, and stores Meter Data. 708 This Security Target is consistent to the security problem defined in [PP_GW]. 709 This Security Target is consistent to the security objectives stated in [PP_GW], no secu- 710 rity objective of the PP is removed, nor added to this Security Target. 711 This Security Target is consistent to the security requirements stated in [PP_GW], no 712 security requirement of the PP is removed, nor added to this Security Target. 713 714 page 35 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 3 Security Problem Definition 715 3.1External entities 716 The following external entities interact with the system consisting of Meter and Gateway. 717 Those roles have been defined for the use in this Security Target. It is possible that a 718 party implements more than one role in practice. 719 Role Description Consumer The authorised individual or organization that “owns” the Meter Data. In most cases, this will be tenants or house owners con- suming electricity, water, gas or further commodities. However, it is also possible that the consumer produces or stores energy (e.g. with their own solar plant). Gateway Admin- istrator Authority that installs, configures, monitors, and controls the Smart Meter Gateway. Service Techni- cian The authorised individual that is responsible for diagnostic pur- poses. Authorised Exter- nal Entity / User Human or IT entity possibly interacting with the TOE from outside of the TOE boundary. In the context of this ST, the term user or external entity serve as a hypernym for all entities mentioned be- fore. Table 5: Roles used in the Security Target 720 721 3.2Assets 722 The following tables introduces the relevant assets for this Security Target. The tables 723 focus on the assets that are relevant for the Gateway and does not claim to provide an 724 overview over all assets in the Smart Metering System or for other devices in the LMN. 725 The following Table 6 lists all assets typified as “user data”: 726 727 page 36 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Asset Description Need for Protection Meter Data Meter readings that allow calculation of the quantity of a commodity, e.g. electricity, gas, water or heat consumed over a period. Meter Data comprise Consumption or Production Data (billing-relevant) and grid status data (not billing-relevant). While billing-relevant data needs to have a relation to the Consumer, grid status data do not have to be directly related to a Consumer. • According to their specific need (see below) System log data Log data from the • system log. • Integrity • Confidentiality (only authorised SMGW administrators and Service technicians may read the log data) Consumer log data Log data from the • consumer log. • Integrity • Confidentiality (only authorised Consumers may read the log data) Calibration log data Log data from the • calibration log. • Integrity • Confidentiality (only authorised SMGW ad- ministrators may read the log data) Consumption Data Billing-relevant part of Meter Data. Please note that the term Consumption Data implicitly includes Production Data. • Integrity and authenticity (comparable to the classical meter and its security requirements) • Confidentiality (due to privacy concerns) page 37 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 6: Assets (User data) 728 Table 7 lists all assets typified as “TSF data”: 729 22 Please note that these readings and data of the Meter which are not relevant for billing may require an explicit endorsement of the consumer(s). Status Data Grid status data, subset of Meter Data that is not billing-relevant22. • Integrity and authenticity (comparable to the classical meter and its security requirements) • Confidentiality (due to privacy concerns) Supplementar y Data The Gateway may be used for communication purposes by devices in the LMN or HAN. It may be that the functionality of the Gateway that is used by such a device is limited to pure (but secure) communication services. Data that is transmitted via the Gateway but that does not belong to one of the aforementioned data types is named Supplementary Data. • According to their specific need Data The term Data is used as hypernym for Meter Data and Supplementary Data. • According to their specific need Gateway time Date and time of the real-time clock of the Gateway. Gateway Time is used in Meter Data records sent to external entities. • Integrity • Authenticity (when time is adjusted to an external reference time) Personally Identifiable Information (PII) Personally Identifiable Information refers to information that can be used to uniquely identify, contact, or locate a single person or can be used with other sources to uniquely identify a single individual. • Confidentiality page 38 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 7: Assets (TSF data) 730 731 Asset Description Need for Protection Meter config (secondary asset) Configuration data of the Meter to control its behaviour including the Meter identity. Configuration data is transmitted to the Meter via the Gateway. • Integrity and authenticity • Confidentiality Gateway config (secondary asset) Configuration data of the Gateway to control its behaviour including the Gateway identity, the Processing Profiles and certificate/key material for authentication. • Integrity and authenticity • Confidentiality CLS config (secondary asset) Configuration data of a CLS to control its behaviour. Configuration data is transmitted to the CLS via the Gateway. • Integrity and authenticity • Confidentiality Firmware update (secondary asset) Firmware update that is downloaded by the TOE to update the firmware of the TOE. • Integrity and authenticity Ephemeral keys (secondary asset) Ephemeral cryptographic material used by the TOE for cryptographic operations. • Integrity and authenticity • Confidentiality page 39 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 3.3Assumptions 732 In this threat model the following assumptions about the environment of the components 733 need to be taken into account in order to ensure a secure operation. 734 A.ExternalPrivacy It is assumed that authorised and authenticated external 735 entities receiving any kind of privacy-relevant data or bill- 736 ing-relevant data and the applications that they operate are 737 trustworthy (in the context of the data that they receive) and 738 do not perform unauthorised analyses of this data with re- 739 spect to the corresponding Consumer(s). 740 A.TrustedAdmins It is assumed that the Gateway Administrator and the Ser- 741 vice Technician are trustworthy and well-trained. 742 A.PhysicalProtection It is assumed that the TOE is installed in a non-public en- 743 vironment within the premises of the Consumer which pro- 744 vides a basic level of physical protection. This protection 745 covers the TOE, the Meter(s) that the TOE communicates 746 with and the communication channel between the TOE and 747 its Security Module. 748 A.ProcessProfile The Processing Profiles that are used when handling data 749 are assumed to be trustworthy and correct. 750 A.Update It is assumed that firmware updates for the Gateway that 751 can be provided by an authorised external entity have un- 752 dergone a certification process according to this Security 753 Target before they are issued and can therefore be as- 754 sumed to be correctly implemented. It is further assumed 755 that the external entity that is authorised to provide the up- 756 date is trustworthy and will not introduce any malware into 757 a firmware update. 758 A.Network It is assumed that 759 • a WAN network connection with a sufficient reliabil- 760 ity and bandwidth for the individual situation is 761 available, 762 • one or more trustworthy sources for an update of 763 the system time are available in the WAN, 764 page 40 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland • the Gateway is the only communication gateway for 765 Meters in the LMN23, 766 • if devices in the HAN have a separate connection 767 to parties in the WAN (beside the Gateway) this 768 connection is appropriately protected. 769 A.Keygen It is assumed that the ECC key pair for a Meter (TLS) is 770 generated securely according to [TR-03109-3] and brought 771 into the Gateway in a secure way by the Gateway Admin- 772 istrator. 773 Application Note 1: This ST acknowledges that the Gateway cannot be com- 774 pletely protected against unauthorised physical access by 775 its environment. However, it is important for the overall se- 776 curity of the TOE that it is not installed within a public envi- 777 ronment. 778 The level of physical protection that is expected to be pro- 779 vided by the environment is the same level of protection 780 that is expected for classical meters that operate according 781 to the regulations of the national calibration authority [TR- 782 03109-1]. 783 Application Note 2: The Processing Profiles that are used for information flow 784 control as referred to by A.ProcessProfile are an essential 785 factor for the preservation of the privacy of the Consumer. 786 The Processing Profiles are used to determine which data 787 shall be sent to which entity at which frequency and how 788 data are processed, e.g. whether the data needs to be re- 789 lated to the Consumer (because it is used for billing pur- 790 poses) or whether the data shall be pseudonymised. 791 The Processing Profiles shall be visible for the Consumer 792 to allow a transparent communication. 793 23 Please note that this assumption holds on a logical level rather than on a physical one. It may be possible that the Meters in the LMN have a physical connection to other devices that would in theory also allow a communication. This is specifically true for wireless communication technologies. It is further possible that signals of Meters are amplified by other devices or other Meters on the physical level without violating this assumption. However, it is assumed that the Meters do only communicate with the TOE and that only the TOE is able to decrypt the data sent by the Meter. page 41 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland It is essential that Processing Profiles correctly define the 794 amount of information that must be sent to an external en- 795 tity. Exact regulations regarding the Processing Profiles 796 and the Gateway Administrator are beyond the scope of 797 this Security Target. 798 799 3.4Threats 800 The following sections identify the threats that are posed against the assets handled by 801 the Smart Meter System. Those threats are the result of a threat model that has been 802 developed for the whole Smart Metering System first and then has been focussed on 803 the threats against the Gateway. It should be noted that the threats in the following par- 804 agraphs consider two different kinds of attackers: 805 • Attackers having physical access to Meter, Gateway, a connection between 806 these components or local logical access to any of the interfaces (local at- 807 tacker), trying to disclose or alter assets while stored in the Gateway or while 808 transmitted between Meters in the LMN and the Gateway. Please note that the 809 following threat model assumes that the local attacker has less motivation than 810 the WAN attacker as a successful attack of a local attacker will always only 811 impact one Gateway. Please further note that the local attacker includes au- 812 thorised individuals like consumers. 813 • An attacker located in the WAN (WAN attacker) trying to compromise the con- 814 fidentiality and/or integrity of the processed Meter Data and or configuration 815 data transmitted via the WAN, or attacker trying to conquer a component of the 816 infrastructure (i.e. Meter, Gateway or Controllable Local System) via the WAN 817 to cause damage to a component itself or to the corresponding grid (e.g. by 818 sending forged Meter Data to an external entity). 819 The specific rationale for this situation is given by the expected benefit of a successful 820 attack. An attacker who has to have physical access to the TOE that they are attacking, 821 will only be able to compromise one TOE at a time. So the effect of a successful attack 822 will always be limited to the attacked TOE. A logical attack from the WAN side on the 823 other hand may have the potential to compromise a large amount of TOEs. 824 825 page 42 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland T.DataModificationLocal A local attacker may try to modify (i.e. alter, delete, insert, 826 replay or redirect) Meter Data when transmitted between 827 Meter and Gateway, Gateway and Consumer, or Gateway 828 and external entities. The objective of the attacker may be 829 to alter billing-relevant information or grid status infor- 830 mation. The attacker may perform the attack via any inter- 831 face (LMN, HAN, or WAN). 832 In order to achieve the modification, the attacker may also 833 try to modify secondary assets like the firmware or config- 834 uration parameters of the Gateway. 835 T.DataModificationWAN A WAN attacker may try to modify (i.e. alter, delete, insert, 836 replay or redirect) Meter Data, Gateway config data, Meter 837 config data, CLS config data or a firmware update when 838 transmitted between the Gateway and an external entity in 839 the WAN. 840 When trying to modify Meter Data, it is the objective of the 841 WAN attacker to modify billing-relevant information or grid 842 status data. 843 When trying to modify config data or a firmware update, the 844 WAN attacker tries to circumvent security mechanisms of 845 the TOE or tries to get control over the TOE or a device in 846 the LAN that is protected by the TOE. 847 T.TimeModification A local attacker or WAN attacker may try to alter the Gate- 848 way time. The motivation of the attacker could be e.g. to 849 change the relation between date/time and measured con- 850 sumption or production values in the Meter Data records 851 (e.g. to influence the balance of the next invoice). 852 T.DisclosureWAN A WAN attacker may try to violate the privacy of the Con- 853 sumer by disclosing Meter Data or configuration data (Me- 854 ter config, Gateway config or CLS config) or parts of it 855 when transmitted between Gateway and external entities 856 in the WAN. 857 page 43 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland T.DisclosureLocal A local attacker may try to violate the privacy of the Con- 858 sumer by disclosing Meter Data transmitted between the 859 TOE and the Meter. This threat is of specific importance if 860 Meters of more than one Consumer are served by one 861 Gateway. 862 T.Infrastructure A WAN attacker may try to obtain control over Gateways, 863 Meters or CLS via the TOE, which enables the WAN at- 864 tacker to cause damage to Consumers or external entities 865 or the grids used for commodity distribution (e.g. by send- 866 ing wrong data to an external entity). 867 A WAN attacker may also try to conquer a CLS in the HAN 868 first in order to logically attack the TOE from the HAN side. 869 T.ResidualData By physical and/or logical means a local attacker or a WAN 870 attacker may try to read out data from the Gateway, which 871 travelled through the Gateway before and which are no 872 longer needed by the Gateway (i.e. Meter Data, Meter con- 873 fig, or CLS config). 874 T.ResidentData A WAN or local attacker may try to access (i.e. read, alter, 875 delete) information to which they don't have permission to 876 while the information is stored in the TOE. 877 While the WAN attacker only uses the logical interface of 878 the TOE that is provided into the WAN, the local attacker 879 may also physically access the TOE. 880 T.Privacy A WAN attacker may try to obtain more detailed infor- 881 mation from the Gateway than actually required to fulfil the 882 tasks defined by its role or the contract with the Consumer. 883 This includes scenarios in which an external entity that is 884 primarily authorised to obtain information from the TOE 885 tries to obtain more information than the information that 886 has been authorised as well as scenarios in which an at- 887 tacker who is not authorised at all tries to obtain infor- 888 mation. 889 890 page 44 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 3.5Organizational Security Policies 891 This section lists the organizational security policies (OSP) that the Gateway shall com- 892 ply with: 893 OSP.SM The TOE shall use the services of a certified Security Mod- 894 ule for 895 • verification of digital signatures, 896 • generation of digital signatures, 897 • key agreement, 898 • key transport, 899 • key storage, 900 • Random Number Generation, 901 The Security Module shall be certified according to 902 [SecModPP] and shall be used in accordance with its rele- 903 vant guidance documentation. 904 OSP.Log The TOE shall maintain a set of log files as defined in [TR- 905 03109-1] as follows: 906 1. A system log of relevant events in order to allow an 907 authorised Gateway Administrator to analyse the 908 status of the TOE. The TOE shall also analyse the 909 system log automatically for a cumulation of secu- 910 rity relevant events. 911 2. A consumer log that contains information about the 912 information flows that have been initiated to the 913 WAN and information about the Processing Profiles 914 causing this information flow as well as the billing- 915 relevant information. 916 3. A calibration log (as defined in chapter 6.2.1) that 917 provides the Gateway Administrator with a possibil- 918 ity to review calibration relevant events. 919 The TOE shall further limit access to the information in the 920 different log files as follows: 921 1. Access to the information in the system log shall 922 only be allowed for an authorised Gateway 923 page 45 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Administrator via the IF_GW_WAN interface of the 924 TOE and an authorised Service Technician via the 925 IF_GW_SRV interface of the TOE. 926 2. Access to the information in the calibration log shall 927 only be allowed for an authorised Gateway Admin- 928 istrator via the IF_GW_WAN interface of the TOE. 929 3. Access to the information in the consumer log shall 930 only be allowed for an authorised Consumer via the 931 IF_GW_CON interface of the TOE. The Consumer 932 shall only have access to their own information. 933 The system log may overwrite the oldest events in case 934 that the audit trail gets full. 935 For the consumer log the TOE shall ensure that a sufficient 936 amount of events is available (in order to allow a Consumer 937 to verify an invoice) but may overwrite older events in case 938 that the audit trail gets full. 939 For the calibration log, however, the TOE shall ensure the 940 availability of all events over the lifetime of the TOE. 941 page 46 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 4 Security Objectives 942 4.1Security Objectives for the TOE 943 O.Firewall The TOE shall serve as the connection point for the con- 944 nected devices within the LAN to external entities within 945 the WAN and shall provide firewall functionality in order to 946 protect the devices of the LMN and HAN (as long as they 947 use the Gateway) and itself against threats from the WAN 948 side. 949 The firewall: 950 • shall allow only connections established from HAN 951 or the TOE itself to the WAN (i.e. from devices in 952 the HAN to external entities in the WAN or from the 953 TOE itself to external entities in the WAN), 954 • shall provide a wake-up service on the WAN side 955 interface, 956 • shall not allow connections from the LMN to the 957 WAN, 958 • shall not allow any other services being offered on 959 the WAN side interface, 960 • shall not allow connections from the WAN to the 961 LAN or to the TOE itself, 962 • shall enforce communication flows by allowing traf- 963 fic from CLS in the HAN to the WAN only if confi- 964 dentiality-protected and integrity-protected and if 965 endpoints are authenticated. 966 O.SeparateIF The TOE shall have physically separated ports for the 967 LMN, the HAN and the WAN and shall automatically detect 968 during its self test whether connections (wired or wireless), 969 if any, are wrongly connected. 970 Application Note 3: O.SeparateIF refers to physical inter- 971 faces and must not be fulfilled by a pure logical separation 972 of one physical interface only. 973 page 47 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland O.Conceal To protect the privacy of its Consumers, the TOE shall con- 974 ceal the communication with external entities in the WAN 975 in order to ensure that no privacy-relevant information may 976 be obtained by analysing the frequency, load, size or the 977 absence of external communication.24 978 O.Meter The TOE receives or polls information about the consump- 979 tion or production of different commodities from one or mul- 980 tiple Meters and is responsible for handling this Meter 981 Data. 982 This includes that: 983 • The TOE shall ensure that the communication to 984 the Meter(s) is established in an Gateway Adminis- 985 trator-definable interval or an interval as defined by 986 the Meter, 987 • the TOE shall enforce encryption and integrity pro- 988 tection for the communication with the Meter25, 989 • the TOE shall verify the integrity and authenticity of 990 the data received from a Meter before handling it 991 further, 992 • the TOE shall process the data according to the 993 definition in the corresponding Processing Profile, 994 • the TOE shall encrypt the processed Meter Data for 995 the final recipient, sign the data and 996 • deliver the encrypted data to authorised external 997 entities as defined in the corresponding Processing 998 Profiles facilitating an encrypted channel, 999 • the TOE shall store processed Meter Data if an ex- 1000 ternal entity cannot be reached and re-try to send 1001 24 It should be noted that this requirement only applies to communication flows in the WAN. 25 It is acknowledged that the implementation of a secure channel between the Meter and the Gateway is a security function of both units. The TOE as defined in this Security Target only has a limited possibility to secure this communication as both sides have to sign responsible for the quality of a cryptographic connection. However, it should be noted that the encryption of this channel only needs to protect against the Local Attacker possessing a basic attack potential and that the Meter utilises the services of its Security Module to negotiate the channel. page 48 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland the data until a configurable number of unsuccess- 1002 ful retries has been reached, 1003 • the TOE shall pseudonymize the data for parties 1004 that do not need the relation between the pro- 1005 cessed Meter Data and the identity of the Con- 1006 sumer. 1007 O.Crypt The TOE shall provide cryptographic functionality as fol- 1008 lows: 1009 • authentication, integrity protection and encryption 1010 of the communication and data to external entities 1011 in the WAN, 1012 • authentication, integrity protection and encryption 1013 of the communication to the Meter, 1014 • authentication, integrity protection and encryption 1015 of the communication to the Consumer, 1016 • replay detection for all communications with exter- 1017 nal entities, 1018 • encryption of the persistently stored TSF and user 1019 data of the TOE26. 1020 In addition, the TOE shall generate the required keys uti- 1021 lising the services of its Security Module27, ensure that the 1022 keys are only used for an acceptable amount of time and 1023 destroy ephemeral28 keys if no longer needed.29 1024 O.Time The TOE shall provide reliable time stamps and update 1025 its internal clock in regular intervals by retrieving reliable 1026 time information from a dedicated reliable source in the 1027 WAN. 1028 26 The encryption of the persistent memory shall support the protection of the TOE against local attacks. 27 Please refer to chapter 1.4.7 for an overview on how the cryptographic functions are distributed between the TOE and its Security Module. 28 This objective addresses the destruction of ephemeral keys only because all keys that need to be stored persistently are stored in the Security Module. 29 Please refer to chapter F.9 of part 2 of [CC] for more detailed information about what kind of information this objective applies to. page 49 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland O.Protect The TOE shall implement functionality to protect its secu- 1029 rity functions against malfunctions and tampering. 1030 Specifically, the TOE shall 1031 • encrypt its TSF and user data as long as it is not in 1032 use, 1033 • overwrite any information that is no longer needed 1034 to ensure that it is no longer available via the exter- 1035 nal interfaces of the TOE30, 1036 • monitor user data and the TOE firmware for integ- 1037 rity errors, 1038 • contain a test that detects whether the interfaces 1039 for WAN and LAN are separate, 1040 • have a fail-safe design that specifically ensures that 1041 no malfunction can impact the delivery of a com- 1042 modity (e.g. energy, gas, heat or water)31, 1043 • make any physical manipulation within the scope of 1044 the intended environment detectable for the Con- 1045 sumer and Gateway Administrator. 1046 O.Management The TOE shall only provide authorised Gateway Adminis- 1047 trators with functions for the management of the security 1048 features. 1049 The TOE shall ensure that any change in the behaviour of 1050 the security functions can only be achieved from the WAN 1051 side interface. Any management activity from a local inter- 1052 face may only be read only. 1053 Further, the TOE shall implement a secure mechanism to 1054 update the firmware of the TOE that ensures that only au- 1055 thorised entities are able to provide updates for the TOE 1056 30 Please refer to chapter F.9 of part 2 of [CC] for more detailed information about what kind of information this objective applies to. 31 Indeed this Security Target acknowledges that the Gateway and the Meters have no possibility at all to impact the deliv- ery of a commodity. Even an intentional stop of the delivery of a certain commodity is not within the scope of this Security Target. It should however be noted that such a functionality may be realised by a CLS that utilises the services of the TOE for its communication. page 50 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland and that only authentic and integrity protected updates are 1057 applied. 1058 O.Log The TOE shall maintain a set of log files as defined in [TR- 1059 03109-1] as follows: 1060 1. A system log of relevant events in order to allow an 1061 authorised Gateway Administrator or an authorised 1062 Service Technician to analyse the status of the 1063 TOE. The TOE shall also analyse the system log 1064 automatically for a cumulation of security relevant 1065 events. 1066 2. A consumer log that contains information about the 1067 information flows that have been initiated to the 1068 WAN and information about the Processing Profiles 1069 causing this information flow as well as the billing- 1070 relevant information and information about the sys- 1071 tem status (including relevant error messages). 1072 3. A calibration log that provides the Gateway Admin- 1073 istrator with a possibility to review calibration rele- 1074 vant events. 1075 The TOE shall further limit access to the information in the 1076 different log files as follows: 1077 1. Access to the information in the system log shall 1078 only be allowed for an authorised Gateway Admin- 1079 istrator via IF_GW_WAN or for an authorised Ser- 1080 vice Technician via IF_GW_SRV. 1081 2. Access to the information in the consumer log shall 1082 only be allowed for an authorised Consumer via the 1083 IF_GW_CON interface of the TOE and via a se- 1084 cured (i.e. confidentiality and integrity protected) 1085 connection. The Consumer shall only have access 1086 to their own information. 1087 3. Read-only access to the information in the calibra- 1088 tion log shall only be allowed for an authorised 1089 page 51 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Gateway Administrator via the WAN interface of the 1090 TOE. 1091 The system log may overwrite the oldest events in case 1092 that the audit trail gets full. 1093 For the consumer log, the TOE shall ensure that a suffi- 1094 cient amount of events is available (in order to allow a Con- 1095 sumer to verify an invoice) but may overwrite older events 1096 in case that the audit trail gets full. 1097 For the calibration log however, the TOE shall ensure the 1098 availability of all events over the lifetime of the TOE. 1099 O.Access The TOE shall control the access of external entities in 1100 WAN, HAN or LMN to any information that is sent to, from 1101 or via the TOE via its external interfaces32. Access control 1102 shall depend on the destination interface that is used to 1103 send that information. 1104 1105 4.2Security Objectives for the Operational Environment 1106 OE.ExternalPrivacy Authorised and authenticated external entities receiving 1107 any kind of private or billing-relevant data shall be trustwor- 1108 thy and shall not perform unauthorised analyses of these 1109 data with respect to the corresponding consumer(s). 1110 OE.TrustedAdmins The Gateway Administrator and the Service Technician 1111 shall be trustworthy and well-trained. 1112 OE.PhysicalProtection The TOE shall be installed in a non-public environment 1113 within the premises of the Consumer that provides a basic 1114 level of physical protection. This protection shall cover the 1115 TOE, the Meters that the TOE communicates with and the 1116 communication channel between the TOE and its Security 1117 32 While in classical access control mechanisms the Gateway Administrator gets complete access, the TOE also maintains a set of information (specifically the consumer log) to which Gateway Administrators have restricted access. page 52 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Module. Only authorised individuals may physically access 1118 the TOE. 1119 OE.Profile The Processing Profiles that are used when handling data 1120 shall be obtained from a trustworthy and reliable source 1121 only. 1122 OE.SM The environment shall provide the services of a certified 1123 Security Module for 1124 • verification of digital signatures, 1125 • generation of digital signatures, 1126 • key agreement, 1127 • key transport, 1128 • key storage, 1129 • Random Number Generation. 1130 The Security Module used shall be certified according to 1131 [SecModPP] and shall be used in accordance with its rele- 1132 vant guidance documentation. 1133 OE.Update The firmware updates for the Gateway that can be pro- 1134 vided by an authorised external entity shall undergo a cer- 1135 tification process according to this Security Target before 1136 they are issued to show that the update is implemented 1137 correctly. The external entity that is authorised to provide 1138 the update shall be trustworthy and ensure that no mal- 1139 ware is introduced via a firmware update. 1140 OE.Network It shall be ensured that 1141 • a WAN network connection with a sufficient reliabil- 1142 ity and bandwidth for the individual situation is 1143 available, 1144 • one or more trustworthy sources for an update of 1145 the system time are available in the WAN, 1146 • the Gateway is the only communication gateway for 1147 Meters in the LMN, 1148 page 53 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland • if devices in the HAN have a separate connection 1149 to parties in the WAN (beside the Gateway) this 1150 connection is appropriately protected. 1151 OE.Keygen It shall be ensured that the ECC key pair for a Meter (TLS) 1152 is generated securely according to the [TR-03109-3]. It 1153 shall also be ensured that the keys are brought into the 1154 Gateway in a secure way by the Gateway Administrator. 1155 1156 4.3Security Objective Rationale 1157 4.3.1 Overview 1158 The following table gives an overview how the assumptions, threats, and organisational 1159 security policies are addressed by the security objectives. The text of the following sec- 1160 tions justifies this more in detail. 1161 O.Firewall O.SeparateIF O.Conceal O.Meter O.Crypt O.Time O.Protect O.Management O.Log O.Access OE.SM OE.ExternalPrivacy OE.TrustedAdmins OE.PhysicalProtec- tion OE.Profile OE.Update OE.Network OE.Keygen T.DataModification- Local X X X X X X T.DataModification- WAN X X X X X T.TimeModification X X X X X X T.DisclosureWAN X X X X X X T.DisclosureLocal X X X X X X T.Infrastructure X X X X X X X T.ResidualData X X X page 54 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 8: Rationale for Security Objectives 1162 1163 4.3.2 Countering the threats 1164 The following sections provide more detailed information on how the threats are coun- 1165 tered by the security objectives for the TOE and its operational environment. 1166 1167 4.3.2.1 General objectives 1168 The security objectives O.Protect, O.Management and OE.TrustedAdmins contribute 1169 to counter each threat and contribute to each OSP. 1170 O.Management is indispensable as it defines the requirements around the management 1171 of the Security Functions. Without a secure management no TOE can be secure. Also 1172 OE.TrustedAdmins contributes to this aspect as it provides the requirements on the 1173 availability of a trustworthy Gateway Administrator and Service Technician. O.Protect is 1174 present to ensure that all security functions are working as specified. 1175 Those general objectives will not be addressed in detail in the following paragraphs. 1176 T.ResidentData X X X X X X X T.Privacy X X X X X X X X OSP.SM X X X X X OSP.Log X X X X X A.ExternalPrivacy X A.TrustedAdmins X A.PhysicalProtection X A.ProcessProfile X A.Update X A.Network X A.Keygen X page 55 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 4.3.2.2 T.DataModificationLocal 1177 The threat T.DataModificationLocal is countered by a combination of the security ob- 1178 jectives O.Meter, O.Crypt, O.Log and OE.PhysicalProtection. 1179 O.Meter defines that the TOE will enforce the encryption of communication when receiv- 1180 ing Meter Data from the Meter. O.Crypt defines the required cryptographic functionality. 1181 The objectives together ensure that the communication between the Meter and the TOE 1182 cannot be modified or released. 1183 OE.PhysicalProtection is of relevance as it ensures that access to the TOE is limited. 1184 4.3.2.3 T.DataModificationWAN 1185 The threat T.DataModificationWAN is countered by a combination of the security ob- 1186 jectives O.Firewall and O.Crypt. 1187 O.Firewall defines the connections for the devices within the LAN to external entities 1188 within the WAN and shall provide firewall functionality in order to protect the devices of 1189 the LMN and HAN (as long as they use the Gateway) and itself against threats from the 1190 WAN side. O.Crypt defines the required cryptographic functionality. Both objectives to- 1191 gether ensure that the data transmitted between the TOE and the WAN cannot be mod- 1192 ified by a WAN attacker. 1193 4.3.2.4 T.TimeModification 1194 The threat T.TimeModification is countered by a combination of the security objectives 1195 O.Time, O.Crypt and OE.PhysicalProtection. 1196 O.Time defines that the TOE needs a reliable time stamp mechanism that is also up- 1197 dated from reliable sources regularly in the WAN. O.Crypt defines the required crypto- 1198 graphic functionality for the communication to external entities in the WAN. Therewith, 1199 O.Time and O.Crypt are the core objective to counter the threat T.TimeModification. 1200 OE.PhysicalProtection is of relevance as it ensures that access to the TOE is limited. 1201 4.3.2.5 T.DisclosureWAN 1202 The threat T.DisclosureWAN is countered by a combination of the security objectives 1203 O.Firewall, O.Conceal and O.Crypt. 1204 O.Firewall defines the connections for the devices within the LAN to external entities 1205 within the WAN and shall provide firewall functionality in order to protect the devices of 1206 the LMN and HAN (as long as they use the Gateway) and itself against threats from the 1207 WAN side. O.Crypt defines the required cryptographic functionality. Both objectives 1208 page 56 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland together ensure that the communication between the Meter and the TOE cannot be dis- 1209 closed. 1210 O.Conceal ensures that no information can be disclosed based on additional character- 1211 istics of the communication like frequency, load or the absence of a communication. 1212 4.3.2.6 T.DisclosureLocal 1213 The threat T.DisclosureLocal is countered by a combination of the security objectives 1214 O.Meter, O.Crypt and OE.PhysicalProtection. 1215 O.Meter defines that the TOE will enforce the encryption and integrity protection of com- 1216 munication when polling or receiving Meter Data from the Meter. O.Crypt defines the 1217 required cryptographic functionality. Both objectives together ensure that the communi- 1218 cation between the Meter and the TOE cannot be disclosed. 1219 OE.PhysicalProtection is of relevance as it ensures that access to the TOE is limited. 1220 4.3.2.7 T.Infrastructure 1221 The threat T.Infrastructure is countered by a combination of the security objectives 1222 O.Firewall, O.SeparateIF, O.Meter and O.Crypt. 1223 O.Firewall is the core objective that counters this threat. It ensures that all communica- 1224 tion flows to the WAN are initiated by the TOE. The fact that the TOE does not offer any 1225 services to the WAN side and will not react to any requests (except the wake-up call) 1226 from the WAN is a significant aspect in countering this threat. Further the TOE will only 1227 communicate using encrypted channels to authenticated and trustworthy parties which 1228 mitigates the possibility that an attacker could try to hijack a communication. 1229 O.Meter defines that the TOE will enforce the encryption and integrity protection for the 1230 communication with the Meter. 1231 O.SeparateIF facilitates the disjunction of the WAN from the LMN. 1232 O.Crypt supports the mitigation of this threat by providing the required cryptographic 1233 primitives. 1234 4.3.2.8 T.ResidualData 1235 The threat T.ResidualData is mitigated by the security objective O.Protect as this se- 1236 curity objective defines that the TOE shall delete information as soon as it is no longer 1237 used. Assuming that a TOE follows this requirement, an attacker cannot read out any 1238 residual information as it does simply not exist. 1239 page 57 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 4.3.2.9 T.ResidentData 1240 The threat T.ResidentData is countered by a combination of the security objectives 1241 O.Access, O.Firewall, O.Protect and O.Crypt. Further, the environment (OE.Physi- 1242 calProtection and OE.TrustedAdmins) contributes to this. 1243 O.Access defines that the TOE shall control the access of users to information via the 1244 external interfaces. 1245 The aspect of a local attacker with physical access to the TOE is covered by a combi- 1246 nation of O.Protect (defining the detection of physical manipulation) and O.Crypt (re- 1247 quiring the encryption of persistently stored TSF and user data of the TOE). In addition, 1248 the physical protection provided by the environment (OE.PhysicalProtection) and the 1249 Gateway Administrator (OE.TrustedAdmins) who could realise a physical manipulation 1250 contribute to counter this threat. 1251 The aspect of a WAN attacker is covered by O.Firewall as this objective ensures that 1252 an adequate level of protection is realised against attacks from the WAN side. 1253 4.3.2.10 T.Privacy 1254 The threat T.Privacy is primarily addressed by the security objectives O.Meter, O.Crypt 1255 and O.Firewall as these objective ensures that the TOE will only distribute Meter Data 1256 to external parties in the WAN as defined in the corresponding Processing Profiles and 1257 that the data will be protected for the transfer. OE.Profile is present to ensure that the 1258 Processing Profiles are obtained from a trustworthy and reliable source only. 1259 Finally, O.Conceal ensures that an attacker cannot obtain the relevant information for 1260 this threat by observing external characteristics of the information flow. 1261 4.3.3 Coverage of organisational security policies 1262 The following sections provide more detailed information about how the security objec- 1263 tives for the environment and the TOE cover the organizational security policies. 1264 4.3.3.1 OSP.SM 1265 The Organizational Security Policy OSP.SM that mandates that the TOE utilises the ser- 1266 vices of a certified Security Module is directly addressed by the security objectives 1267 OE.SM and O.Crypt. The objective OE.SM addresses the functions that the Security 1268 Module shall be utilised for as defined in OSP.SM and also requires a certified Security 1269 Module. O.Crypt defines the cryptographic functionalities for the TOE itself. In this 1270 page 58 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland context, it has to be ensured that the Security Module is operated in accordance with its 1271 guidance documentation. 1272 4.3.3.2 OSP.Log 1273 The Organizational Security Policy OSP.Log that mandates that the TOE maintains an 1274 audit log is directly addressed by the security objective for the TOE O.Log. 1275 O.Access contributes to the implementation of the OSP as it defines that also Gateway 1276 Administrators are not allowed to read/modify all data. This is of specific importance to 1277 ensure the confidentiality and integrity of the log data as is required by the OSP.Log. 1278 4.3.4 Coverage of assumptions 1279 The following sections provide more detailed information about how the security objec- 1280 tives for the environment cover the assumptions. 1281 4.3.4.1 A.ExternalPrivacy 1282 The assumption A.ExternalPrivacy is directly and completely covered by the security 1283 objective OE.ExternalPrivacy. The assumption and the objective for the environment 1284 are drafted in a way that the correspondence is obvious. 1285 4.3.4.2 A.TrustedAdmins 1286 The assumption A.TrustedAdmins is directly and completely covered by the security 1287 objective OE.TrustedAdmins. The assumption and the objective for the environment 1288 are drafted in a way that the correspondence is obvious. 1289 4.3.4.3 A.PhysicalProtection 1290 The assumption A.PhysicalProtection is directly and completely covered by the secu- 1291 rity objective OE.PhysicalProtection. The assumption and the objective for the envi- 1292 ronment are drafted in a way that the correspondence is obvious. 1293 4.3.4.4 A.ProcessProfile 1294 The assumption A.ProcessProfile is directly and completely covered by the security 1295 objective OE.Profile. The assumption and the objective for the environment are drafted 1296 in a way that the correspondence is obvious. 1297 4.3.4.5 A.Update 1298 The assumption A.Update is directly and completely covered by the security objective 1299 OE.Update. The assumption and the objective for the environment are drafted in a way 1300 that the correspondence is obvious. 1301 page 59 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 4.3.4.6 A.Network 1302 The assumption A.Network is directly and completely covered by the security objective 1303 OE.Network. The assumption and the objective for the environment are drafted in a way 1304 that the correspondence is obvious. 1305 4.3.4.7 A.Keygen 1306 The assumption A.Keygen is directly and completely covered by the security objective 1307 OE.Keygen. The assumption and the objective for the environment are drafted in a way 1308 that the correspondence is obvious. 1309 1310 page 60 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 5 Extended Component definition 1311 5.1Communication concealing (FPR_CON) 1312 The additional family Communication concealing (FPR_CON) of the Class FPR (Pri- 1313 vacy) is defined here to describe the specific IT security functional requirements of the 1314 TOE. The TOE shall prevent attacks against Personally Identifiable Information (PII) of 1315 the Consumer that may be obtained by an attacker by observing the encrypted commu- 1316 nication of the TOE with remote entities. 1317 1318 5.2Family behaviour 1319 This family defines requirements to mitigate attacks against communication channels in 1320 which an attacker tries to obtain privacy relevant information based on characteristics of 1321 an encrypted communication channel. Examples include but are not limited to an analy- 1322 sis of the frequency of communication or the transmitted workload. 1323 1324 5.3Component levelling 1325 FPR_CON: Communication concealing ------------1 1326 1327 5.4Management 1328 The following actions could be considered for the management functions in FMT: 1329 a. Definition of the interval in FPR_CON.1.2 if definable within the operational 1330 phase of the TOE. 1331 1332 5.5Audit 1333 There are no auditable events foreseen. 1334 1335 5.6Communication concealing (FPR_CON.1) 1336 Hierarchical to: No other components. 1337 Dependencies: No dependencies. 1338 page 61 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FPR_CON.1.1 The TSF shall enforce the [assignment: information 1339 flow policy] in order to ensure that no personally iden- 1340 tifiable information (PII) can be obtained by an analysis 1341 of [assignment: characteristics of the information flow 1342 that need to be concealed]. 1343 FPR_CON.1.2 The TSF shall connect to [assignment: list of external 1344 entities] in intervals as follows [selection: weekly, 1345 daily, hourly, [assignment: other interval]] to conceal 1346 the data flow. 1347 page 62 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6 Security Requirements 1348 6.1Overview 1349 This chapter describes the security functional and the assurance requirements which 1350 have to be fulfilled by the TOE. Those requirements comprise functional components 1351 from part 2 of [CC] and the assurance components as defined for the Evaluation Assur- 1352 ance Level 4 from part 3 of [CC]. 1353 The following notations are used: 1354 • Refinement operation (denoted by bold text): is used to add details to a re- 1355 quirement, and thus further restricts a requirement. In case that a word has 1356 been deleted from the original text this refinement is indicated by crossed out 1357 bold text. 1358 • Selection operation (denoted by underlined text): is used to select one or more 1359 options provided by the [CC] in stating a requirement. 1360 • Assignment operation (denoted by italicised text): is used to assign a specific 1361 value to an unspecified parameter, such as the length of a password. 1362 • Iteration operation: are identified with a suffix in the name of the SFR (e.g. 1363 FDP_IFC.2/FW). 1364 It should be noted that the requirements in the following chapters are not necessarily be 1365 ordered alphabetically. Where useful the requirements have been grouped. 1366 The following table summarises all TOE security functional requirements of this ST: 1367 Class FAU: Security Audit FAU_ARP.1/SYS Security alarms for system log FAU_GEN.1/SYS Audit data generation for system log FAU_SAA.1/SYS Potential violation analysis for system log FAU_SAR.1/SYS Audit review for system log FAU_STG.4/SYS Prevention of audit data loss for the system log FAU_GEN.1/CON Audit data generation for consumer log page 63 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FAU_SAR.1/CON Audit review for consumer log FAU_STG.4/CON Prevention of audit data loss for the consumer log FAU_GEN.1/CAL Audit data generation for calibration log FAU_SAR.1/CAL Audit review for calibration log FAU_STG.4/CAL Prevention of audit data loss for the calibration log FAU_GEN.2 User identity association FAU_STG.2 Guarantees of audit data availability Class FCO: Communication FCO_NRO.2 Enforced proof of origin Class FCS: Cryptographic Support FCS_CKM.1/TLS Cryptographic key generation for TLS FCS_COP.1/TLS Cryptographic operation for TLS FCS_CKM.1/CMS Cryptographic key generation for CMS FCS_COP.1/CMS Cryptographic operation for CMS FCS_CKM.1/MTR Cryptographic key generation for Meter communication encryption FCS_COP.1/MTR Cryptographic operation for Meter communication encryption FCS_CKM.4 Cryptographic key destruction FCS_COP.1/HASH Cryptographic operation for Signatures FCS_COP.1/MEM Cryptographic operation for TSF and user data encryption page 64 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Class FDP: User Data Protection FDP_ACC.2 Complete Access Control FDP_ACF.1 Security attribute based access control FDP_IFC.2/FW Complete information flow control for firewall FDP_IFF.1/FW Simple security attributes for Firewall FDP_IFC.2/MTR Complete information flow control for Meter information flow FDP_IFF.1/MTR Simple security attributes for Meter information FDP_RIP.2 Full residual information protection FDP_SDI.2 Stored data integrity monitoring and action Class FIA: Identification and Authentication FIA_ATD.1 User attribute definition FIA_AFL.1 Authentication failure handling FIA_UAU.2 User authentication before any action FIA_UAU.5 Multiple authentication mechanisms FIA_UAU.6 Re-Authenticating FIA_UID.2 User identification before any action FIA_USB.1 User-subject binding Class FMT: Security Management FMT_MOF.1 Management of security functions behaviour FMT_SMF.1 Specification of Management Functions FMT_SMR.1 Security roles page 65 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FMT_MSA.1/AC Management of security attributes for Gateway access policy FMT_MSA.3/AC Static attribute initialisation for Gateway access policy FMT_MSA.1/FW Management of security attributes for Firewall policy FMT_MSA.3/FW Static attribute initialisation for Firewall policy FMT_MSA.1/MTR Management of security attributes for Meter policy FMT_MSA.3/MTR Static attribute initialisation for Meter policy Class FPR: Privacy FPR_CON.1 Communication Concealing FPR_PSE.1 Pseudonymity Class FPT: Protection of the TSF FPT_FLS.1 Failure with preservation of secure state FPT_RPL.1 Replay Detection FPT_STM.1 Reliable time stamps FPT_TST.1 TSF testing FPT_PHP.1 Passive detection of physical attack Class FTP: Trusted path/channels FTP_ITC.1/WAN Inter-TSF trusted channel for WAN FTP_ITC.1/MTR Inter-TSF trusted channel for Meter FTP_ITC.1/USR Inter-TSF trusted channel for User Table 9: List of Security Functional Requirements 1368 page 66 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2Class FAU: Security Audit 1369 6.2.1 Introduction 1370 The TOE compliant to this Security Target shall implement three different audit logs as 1371 defined in OSP.Log and O.Log. The following table provides an overview over the three 1372 audit logs before the following chapters introduce the SFRs related to those audit logs. 1373 System-Log Consumer-Log Calibration-Log Purpose • Inform the Gateway Administrator about security relevant events • Log all events as defined by Common Criteria [CC] for the used SFR • Log all system relevant events on specific functionality • Automated alarms in case of a cumulation of certain events • Inform the Service Technician about the status of the Gateway • Inform the Consumer about all information flows to the WAN • Inform the Consumer about the Processing Profiles • Inform the Consumer about other metering data (not billing-relevant) • Inform the Consumer about all billing-relevant data needed to verify an invoice • Track changes that are relevant for the calibration of the TOE relevant data needed to verify an invoice Data • As defined by CC part 2 • Augmented by specific events for the security functions • Information about all information flows to the WAN • Information about the current and the previous Processing Profiles • Non-billing-relevant Meter Data • Information about the system status (including relevant errors) • Calibration relevant data only page 67 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 10: Overview over audit processes 1374 • Billing-relevant data needed to verify an invoice Access • Access by authorised Gateway Administrator and via IF_GW_WAN only • Events may only be deleted by an authorised Gateway Administrator via IF_GW_WAN • Read access by authorised Service Technician via IF_GW_SRV only • Read access by authorised Consumer and via IF_GW_CON only to the data related to the current consumer • Read access by authorised Gateway Administrator and via IF_GW_WAN only Deletion • Ring buffer. • The availability of data has to be ensured for a sufficient amount of time • Overwriting old events is possible if the memory is full. • Ring buffer. • The availability of data has to be ensured for a sufficient amount of time. • Overwriting old events is possible if the memory is full • Retention period is set by authorised Gateway Administrator on request by consumer, data older than this are deleted. • The availability of data has to be ensured over the lifetime of the TOE. page 68 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2.2 Security Requirements for the System Log 1375 6.2.2.1 Security audit automatic response (FAU_ARP) 1376 6.2.2.1.1 FAU_ARP.1/SYS: Security Alarms for system log 1377 FAU_ARP.1.1/SYS The TSF shall take inform an authorised Gateway 1378 Administrator and create a log entry in the system log 33 1379 upon detection of a potential security violation. 1380 Hierarchical to: No other components 1381 Dependencies: FAU_SAA.1 Potential violation analysis 1382 1383 6.2.2.2 Security audit data generation (FAU_GEN) 1384 6.2.2.2.1 FAU_GEN.1/SYS: Audit data generation for system log 1385 FAU_GEN.1.1/SYS The TSF shall be able to generate an audit record of the 1386 following auditable events: 1387 a) Start-up and shutdown of the audit functions; 1388 b) All auditable events for the basic34 level of audit; and 1389 c) other non privacy relevant auditable events: none35. 1390 FAU_GEN.1.2/SYS The TSF shall record within each audit record at least the 1391 following information: 1392 a) Date and time of the event, type of event, subject identity 1393 (if applicable), and the outcome (success or failure) of the 1394 event; and 1395 b) For each audit event type, based on the auditable event 1396 definitions of the functional components included in the 1397 PP/ST36, other audit relevant information: none 37. 1398 33 [assignment: list of actions] 34 [selection, choose one of: minimum, basic, detailed, not specified] 35 [assignment: other specifically defined auditable events] 36 [refinement: PP/ST] 37 [assignment: other audit relevant information] page 69 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Hierarchical to: No other components 1399 Dependencies: FPT_STM.1 1400 6.2.2.3 Security audit analysis (FAU_SAA) 1401 6.2.2.3.1 FAU_SAA.1/SYS: Potential violation analysis for system 1402 log 1403 FAU_SAA.1.1./SYS The TSF shall be able to apply a set of rules in monitoring 1404 the audited events and based upon these rules indicate a 1405 potential violation of the enforcement of the SFRs. 1406 FAU_SAA.1.2/SYS The TSF shall enforce the following rules for monitoring 1407 audited events: 1408 a) Accumulation or combination of 1409 • Start-up and shutdown of the audit functions 1410 • all auditable events for the basic level of audit 1411 • all types of failures in the TSF as listed in 1412 FPT_FLS.1 38 1413 known to indicate a potential security violation. 1414 b) any other rules: none 39. 1415 Hierarchical to: No other components 1416 Dependencies: FAU_GEN.1 1417 6.2.2.4 Security audit review (FAU_SAR) 1418 6.2.2.4.1 FAU_SAR.1/SYS: Audit Review for system log 1419 FAU_SAR.1.1/SYS The TSF shall provide only authorised Gateway 1420 Administrators via the IF_GW_WAN interface and 1421 authorised Service Technicians via the IF_GW_SRV 1422 38 [assignment: subset of defined auditable events] 39 [assignment: any other rules] page 70 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland interface 40 with the capability to read all information 41 1423 from the system audit records 42. 1424 FAU_SAR.1.2/SYS The TSF shall provide the audit records in a manner 1425 suitable for the user to interpret the information. 1426 Hierarchical to: No other components 1427 Dependencies: FAU_GEN.1 1428 6.2.2.5 Security audit event storage (FAU_STG) 1429 6.2.2.5.1 FAU_STG.4/SYS: Prevention of audit data loss for 1430 systemlog 1431 FAU_STG.4.1/SYS The TSF shall overwrite the oldest stored audit records 43 1432 and other actions to be taken in case of audit storage 1433 failure: none 44 if the system audit trail 45 is full. 1434 Hierarchical to: FAU_STG.3 Action in case of possible audit data loss 1435 Dependencies: FAU_STG.1 Protected audit trail storage 1436 Application Note 4: The size of the audit trail that is available before the oldest 1437 events get overwritten is configurable for the Gateway 1438 Administrator. 1439 40 [assignment: authorised users] 41 [assignment: list of audit information] 42 [refinement: audit records] 43 [selection, choose one of: “ignore audited events”, “prevent audited events, except those taken by the authorised user with special rights”, “overwrite the oldest stored audit records”] 44 [assignment: other actions to be taken in case of audit storage failure] 45 [refinement: audit trail] page 71 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2.3 Security Requirements for the Consumer Log 1440 6.2.3.1 Security audit data generation (FAU_GEN) 1441 6.2.3.1.1 FAU_GEN.1/CON: Audit data generation for consumer log 1442 FAU_GEN.1.1/CON The TSF shall be able to generate an audit record of the 1443 following auditable events: 1444 a) Start-up and shutdown of the audit functions; 1445 b) All auditable events for the not specified46 level of audit; 1446 and 1447 c) all audit events as listed in Table 11 and additional 1448 events: none 47. 1449 FAU_GEN.1.2/CON The TSF shall record within each audit record at least the 1450 following information: 1451 a) Date and time of the event, type of event, subject identity 1452 (if applicable), and the outcome (success or failure) of the 1453 event; and 1454 b) For each audit event type, based on the auditable event 1455 definitions of the functional components included in the 1456 PP/ST48, additional information as listed in Table 11 and 1457 additional events: none 49. 1458 Hierarchical to: No other components 1459 Dependencies: FPT_STM.1 1460 1461 46 [selection, choose one of: minimum, basic, detailed, not specified] 47 [assignment: other specifically defined auditable events] 48 [refinement: PP/ST] 49 [assignment: other audit relevant information] page 72 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 11: Events for consumer log 1462 1463 6.2.3.2 Security audit review (FAU_SAR) 1464 6.2.3.2.1 FAU_SAR.1/CON: Audit Review for consumer log 1465 FAU_SAR.1.1/CON The TSF shall provide only authorised Consumer via the 1466 IF_GW_CON interface 50 with the capability to read all 1467 50 [assignment: authorised users] Event Additional Information Any change to a Processing Profile The new and the old Processing Profile Any submission of Meter Data to an external entity The Processing Profile that lead to the submission The submitted values Any submission of Meter Data that is not billing- relevant - Billing-relevant data - Any administrative action performed - Relevant system status information including relevant errors - page 73 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland information that are related to them 51 from the consumer 1468 audit records 52. 1469 FAU_SAR.1.2/CON The TSF shall provide the audit records in a manner 1470 suitable for the user to interpret the information. 1471 Hierarchical to: No other components 1472 Dependencies: FAU_GEN.1 1473 Application Note 5: FAU_SAR.1.2/CON shall ensure that the Consumer is 1474 able to interpret the information that is provided to him in a 1475 way that allows him to verify the invoice. 1476 6.2.3.3 Security audit event storage (FAU_STG) 1477 6.2.3.3.1 FAU_STG.4/CON: Prevention of audit data loss for the 1478 consumer log 1479 FAU_STG.4.1/CON The TSF shall overwrite the oldest stored audit records and 1480 interrupt metrological operation in case that the oldest 1481 audit record must still be kept for billing verification 53 if the 1482 consumer audit trail is full. 1483 Hierarchical to: FAU_STG.3 Action in case of possible audit data loss 1484 Dependencies: FAU_STG.1 Protected audit trail storage 1485 Application Note 6: The size of the audit trail that is available before the oldest 1486 events get overwritten is configurable for the Gateway 1487 Administrator. 1488 51 [assignment: list of audit information] 52 [refinement: audit records] 53 [assignment: other actions to be taken in case of audit storage failure] page 74 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2.4 Security Requirements for the Calibration Log 1489 6.2.4.1 Security audit data generation (FAU_GEN) 1490 6.2.4.1.1 FAU_GEN.1/CAL: Audit data generation for calibration log 1491 FAU_GEN.1.1/CAL The TSF shall be able to generate an audit record of the 1492 following auditable events: 1493 a) Start-up and shutdown of the audit functions; 1494 b) All auditable events for the not specified 54 level of audit; 1495 and 1496 c) all calibration-relevant information according to Table 1497 1255. 1498 FAU_GEN.1.2/CAL The TSF shall record within each audit record at least the 1499 following information: 1500 a) Date and time of the event, type of event, subject identity 1501 (if applicable), and the outcome (success or failure) of the 1502 event; and 1503 b) For each audit event type, based on the auditable event 1504 definitions of the functional components included in the 1505 PP/ST 56, other audit relevant information: none 57. 1506 Hierarchical to: No other components 1507 Dependencies: FPT_STM.1 1508 Application Note 7: The calibration log serves to fulfil national requirements in 1509 the context of the calibration of the TOE. 1510 1511 54 [selection, choose one of: minimum, basic, detailed, not specified] 55 [assignment: other specifically defined auditable events] 56 [refinement: PP/ST] 57 [assignment: other audit relevant information] page 75 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Event / Parameter Content Commissioning Commissioning of the SMGW MUST be logged in calibration log. Event of self-test Initiation of self-test MUST be logged in calibration log. New meter Connection and registration of a new meter MUST be logged in calibration log. Meter removal Removal of a meter from SMGW MUST be logged in calibration log. Change of tarification profiles Every change (incl. parameter change) of a tarification profile according to [TR-03109-1, 4.4], provided the parameter is relevant for calibration regulations (see below) as well as new storage or removal of tarification profiles MUST be logged in calibration log. Parameter relevant for calibration regulations are: • Device-ID of a meter - Unique identifier of the meter, which send the input values for a TAF • OBIS value of the measured variable of the meter - Unique value for the measured variable of the meter for the used TAF • Metering point name - Unique name of the metering point • Billing period - Period in which a billing should be done • Consumer ID • Validity period - Period for which the TAF is booked • Definition of tariff stages - Defines different tariff stages and associated OBIS values. Here it will be defined which tariff stage is valid at the time of rule set activation • Tariff switching time - Defines to the split second the switching of tariff stages. The time points can be defined as periodic values • Register period - Time distance of two consecutive measured value acquisitions for meter readings page 76 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Change of meter profiles Every change (incl. parameter change) of a meter profile according to [TR-03109-1, 4.4], provided the parameter is relevant for calibration regulations (see below) as well as new storage or removal of meter profiles MUST be logged in calibration log. Parameter relevant for legal metrology are: • Device-ID - Unique identifier of the meter according to DIN 43863-5 • Key material - Public key for inner signature (dependent on the used meter in LMN) • Register period - Interval during receipt of meter values • Displaying interval (‘Anzeigeintervall’) - Interval during which the actual meter value (only during display) must be updated in case of bidirectional communication between meter and SMGW • Balancing (‘Saldierend’) - Determines if the meter is balancing (‘saldierend’) and meter values can grow and fall • OBIS values - OBIS values according to IEC-62056-6-1 resp. EN 13757-1 • Converter factor (‘Wandlerfaktor’) - Value is 1 in case of directly connected meter. In usage of converter counter (‘Wandlerzähler’) the value may be different. Software update Every update of the code which touches calibration regulations (serialized COSEM-objects, rules) MUST be logged in calibration log. Firmware update Every firmware update (incl. operating system update if applicable) MUST be logged in calibration log. Error messages of a meter All FATAL messages of a connected meter MUST be logged in calibration log according to 0 - no error 1 - Warning, no action to be done according to calibration authority, meter value valid page 77 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 2 - Temporal error, send meter value will be marked as invalid, the value in meter field (‘Messwertfeld’) could be used according to the rules of [VDE4400] resp. [G865] as replacement value (‘Ersatzwert’) in backend. 3 - Temporal error, send meter value is invalid; the value in the meter field (‘Messwertfeld’) cannot be used as replacement value in backend. 4 - Fatal error (meter defect), actual send value is invalid and all future values will be invalid. including the device-ID. Error messages of a SMGW All self-test and calibration regulations relevant errors MUST be logged in calibration log. Table 12: Content of calibration log 1512 1513 page 78 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2.4.2 Security audit review (FAU_SAR) 1514 6.2.4.2.1 FAU_SAR.1/CAL: Audit Review for the calibration log 1515 FAU_SAR.1.1/CAL The TSF shall provide only authorised Gateway 1516 Administrators via the IF_GW_WAN interface 58 with the 1517 capability to read all information 59 from the calibration 1518 audit records 60. 1519 FAU_SAR.1.2/CAL The TSF shall provide the audit records in a manner 1520 suitable for the user to interpret the information. 1521 Hierarchical to: No other components 1522 Dependencies: FAU_GEN.1 1523 6.2.4.3 Security audit event storage (FAU_STG) 1524 6.2.4.3.1 FAU_STG.4/CAL: Prevention of audit data loss for 1525 calibration log 1526 FAU_STG.4.1/CAL The TSF shall ignore audited events 61 and stop the 1527 operation of the TOE and inform a Gateway 1528 Administrator 62 if the calibration audit trail 63 is full. 1529 Hierarchical to: FAU_STG.3 Action in case of possible audit data loss 1530 Dependencies: FAU_STG.1 Protected audit trail storage 1531 Application Note 8: As outlined in the introduction it has to be ensured that the 1532 events of the calibration log are available over the lifetime 1533 of the TOE. 1534 58 [assignment: authorised users] 59 [assignment: list of audit information] 60 [refinement: audit records] 61 [selection, choose one of: “ignore audited events”, “prevent audited events, except those taken by the authorised user with special rights”, “overwrite the oldest stored audit records”] 62 [assignment: other actions to be taken in case of audit storage failure] 63 [refinement: audit trail] page 79 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2.5 Security Requirements that apply to all logs 1535 6.2.5.1 Security audit data generation (FAU_GEN) 1536 6.2.5.1.1 FAU_GEN.2: User identity association 1537 FAU_GEN.2.1 For audit events resulting from actions of identified users, 1538 the TSF shall be able to associate each auditable event 1539 with the identity of the user that caused the event. 1540 Hierarchical to: No other components 1541 Dependencies: FAU_GEN.1 1542 FIA_UID.1 1543 Application Note 9: Please note that FAU_GEN.2 applies to all audit logs, the 1544 system log, the calibration log, and the consumer log. 1545 page 80 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.2.5.2 Security audit event storage (FAU_STG) 1546 6.2.5.2.1 FAU_STG.2: Guarantees of audit data availability 1547 FAU_STG.2.1 The TSF shall protect the stored audit records in the all 1548 audit trails 64 from unauthorised deletion. 1549 FAU_STG.2.2 The TSF shall be able to prevent 65 unauthorised 1550 modifications to the stored audit records in the all audit 1551 trails 66. 1552 FAU_STG.2.3 The TSF shall ensure that all 67 stored audit records will be 1553 maintained when the following conditions occur: audit 1554 storage exhaustion or failure 68. 1555 Hierarchical to: FAU_STG.1 Protected audit trail storage 1556 Dependencies: FAU_GEN.1 1557 Application Note 10: Please note that FAU_STG.2 applies to all audit logs, the 1558 system log, the calibration log, and the consumer log. 1559 64 [refinement: audit trail] 65 [selection, choose one of: prevent, detect] 66 [refinement: audit trail] 67 [assignment: metric for saving audit records] 68 [selection: audit storage exhaustion, failure, attack] page 81 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.3Class FCO: Communication 1560 6.3.1 Non-repudiation of origin (FCO_NRO) 1561 6.3.1.1 FCO_NRO.2: Enforced proof of origin 1562 FCO_NRO.2.1 The TSF shall enforce the generation of evidence of origin 1563 for transmitted Meter Data 69 at all times. 1564 FCO_NRO.2.2 The TSF shall be able to relate the key material used for 1565 signature 70, 71 of the originator of the information, and the 1566 signature 72 of the information to which the evidence 1567 applies. 1568 FCO_NRO.2.3 The TSF shall provide a capability to verify the evidence of 1569 origin of information to recipient, Consumer 73 given 1570 limitations of the digital signature according to TR-03109- 1571 1 74. 1572 Hierarchical to: FCO_NRO.1 Selective proof of origin 1573 Dependencies: FIA_UID.1 Timing of identification 1574 Application Note 11: FCO_NRO.2 requires that the TOE calculates a signature 1575 over Meter Data that is submitted to external entities. 1576 Therefore, the TOE has to create a hash value over the 1577 Data To Be Signed (DTBS) as defined in 1578 FCS_COP.1/HASH. The creation of the actual signature 1579 however is performed by the Security Module. 1580 69 [assignment: list of information types] 70 [assignment: list of attributes] 71 The key material here also represents the identity of the Gateway. 72 [assignment: list of information fields] 73 [selection: originator, recipient, [assignment: list of third parties]] 74 [assignment: limitations on the evidence of origin] page 82 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.4Class FCS: Cryptographic Support 1581 6.4.1 Cryptographic support for TLS 1582 6.4.1.1 Cryptographic key management (FCS_CKM) 1583 6.4.1.1.1 FCS_CKM.1/TLS: Cryptographic key generation for TLS 1584 FCS_CKM.1.1/TLS The TSF shall generate cryptographic keys in accordance 1585 with a specified cryptographic key generation algorithm 1586 TLS-PRF with SHA-256 or SHA-384 75 and specified 1587 cryptographic key sizes 128 bit, 256 bit or 384 bit 76 that 1588 meet the following: [RFC 5246] in combination with 1589 [FIPS Pub. 180-4] and [RFC 2104] 77. 1590 Hierarchical to: No other components. 1591 Dependencies: [FCS_CKM.2 Cryptographic key distribution, or 1592 FCS_COP.1 Cryptographic operation], fulfilled by 1593 FCS_COP .1/TLS 1594 FCS_CKM.4 Cryptographic key destruction 1595 Application Note 12: The Security Module is used for the generation of random 1596 numbers and for all cryptographic operations with the pri- 1597 vate key of a TLS certificate. 1598 Application Note 13: The TOE uses only cryptographic specifications and 1599 algorithms as described in [TR-03109-3]. 1600 6.4.1.2 Cryptographic operation (FCS_COP) 1601 6.4.1.2.1 FCS_COP.1/TLS: Cryptographic operation for TLS 1602 FCS_COP.1.1/TLS The TSF shall perform TLS encryption, decryption, and 1603 integrity protection 78 in accordance with a specified 1604 cryptographic algorithm TLS cipher suites 1605 75 [assignment: key generation algorithm] 76 [assignment: cryptographic key sizes] 77 [assignment: list of standards] 78 [assignment: list of cryptographic operations] page 83 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, 1606 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384, 1607 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 1608 and 1609 TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 1610 79 using elliptic curves BrainpoolP256r1, BrainpoolP384r1, 1611 BrainpoolP512r1 (according to [RFC 5639]), NIST P-256, 1612 and NIST P-384 (according to [RFC 5114]) and 1613 cryptographic key sizes 128 bit or 256 bit 80 that meet the 1614 following: [RFC 2104], [RFC 5114], [RFC 5246], 1615 [RFC 5289], [RFC 5639], [NIST 800-38A], and [NIST 800- 1616 38D] 81. 1617 Hierarchical to: No other components. 1618 Dependencies: [FDP_ITC.1 Import of user data without security attributes, 1619 or 1620 FDP_ITC.2 Import of user data with security attributes, or 1621 FCS_CKM.1 Cryptographic key generation], fulfilled by 1622 FCS_CKM.1/TLS 1623 FCS_CKM.4 Cryptographic key destruction 1624 Application Note 14: The TOE uses only cryptographic specifications and 1625 algorithms as described in [TR-03109-3]. 1626 6.4.2 Cryptographic support for CMS 1627 6.4.2.1 Cryptographic key management (FCS_CKM) 1628 6.4.2.1.1 FCS_CKM.1/CMS: Cryptographic key generation for CMS 1629 FCS_CKM.1.1/CMS The TSF shall generate cryptographic keys in accordance 1630 with a specified cryptographic key generation algorithm 1631 ECKA-EG 82 and specified cryptographic key sizes 128 1632 79 [assignment: cryptographic algorithm] 80 [assignment: cryptographic key sizes] 81 [assignment: list of standards] 82 [assignment: cryptographic key generation algorithm] page 84 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland bit 83 that meet the following: [X9.63] in combination with 1633 [RFC 3565] 84. 1634 Hierarchical to: No other components. 1635 Dependencies: [FCS_CKM.2 Cryptographic key distribution, or 1636 FCS_COP.1 Cryptographic operation], fulfilled by 1637 FCS_COP.1/CMS 1638 FCS_CKM.4 Cryptographic key destruction 1639 Application Note 15: The TOE utilises the services of its Security Module for the 1640 generation of random numbers and for all cryptographic 1641 operations with the private asymmetric key of a CMS cer- 1642 tificate. 1643 Application Note 16: The TOE uses only cryptographic specifications and 1644 algorithms as described in [TR-03109-3]. 1645 6.4.2.2 Cryptographic operation (FCS_COP) 1646 6.4.2.2.1 FCS_COP.1/CMS: Cryptographic operation for CMS 1647 FCS_COP.1.1/CMS The TSF shall perform 1648 symmetric encryption, decryption and integrity protection 1649 in accordance with a specified cryptographic algorithm 1650 AES-CBC-CMAC or AES-GCM 85 and cryptographic key 1651 sizes 128 bit 86 that meet the following: [FIPS Pub. 197], 1652 83 [assignment: cryptographic key sizes] 84 [assignment: list of standards] 85 [assignment: list of cryptographic operations] 86 [assignment: cryptographic key sizes] page 85 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland [NIST 800-38D], [RFC 4493], [RFC 5084], and [RFC 5652] 1653 in combination with [NIST 800-38A] 87. 1654 Hierarchical to: No other components. 1655 Dependencies: [FDP_ITC.1 Import of user data without security attributes, 1656 or 1657 FDP_ITC.2 Import of user data with security attributes, or 1658 FCS_CKM.1 Cryptographic key generation], fulfilled by 1659 FCS_CKM.1/CMS 1660 FCS_CKM.4 Cryptographic key destruction 1661 Application Note 17: The TOE uses only cryptographic specifications and 1662 algorithms as described in [TR-03109-3]. 1663 6.4.3 Cryptographic support for Meter communication encryption 1664 6.4.3.1 Cryptographic key management (FCS_CKM) 1665 6.4.3.1.1 FCS_CKM.1/MTR: Cryptographic key generation for Meter 1666 communication (symmetric encryption) 1667 FCS_CKM.1.1/MTR The TSF shall generate cryptographic keys in accordance 1668 with a specified cryptographic key generation algorithm 1669 AES-CMAC 88 and specified cryptographic key sizes 128 1670 bit 89 that meet the following: [FIPS Pub. 197], and 1671 [RFC 4493] 90. 1672 Hierarchical to: No other components. 1673 Dependencies: [FCS_CKM.2 Cryptographic key distribution, or 1674 FCS_COP.1 Cryptographic operation], fulfilled by 1675 FCS_COP.1/MTR 1676 FCS_CKM.4 Cryptographic key destruction 1677 87 [assignment: list of standards] 88 [assignment: cryptographic key generation algorithm] 89 [assignment: cryptographic key sizes] 90 [assignment: list of standards] page 86 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Application Note 18: The TOE uses only cryptographic specifications and 1678 algorithms as described in [TR-03109-3]. 1679 6.4.3.2 Cryptographic operation (FCS_COP) 1680 6.4.3.2.1 FCS_COP.1/MTR: Cryptographic operation for Meter 1681 communication encryption 1682 FCS_COP.1.1/MTR The TSF shall perform symmetric encryption, decryption, 1683 integrity protection 91 in accordance with a specified 1684 cryptographic algorithm AES-CBC-CMAC 92 and 1685 cryptographic key sizes 128 bit 93 that meet the following: 1686 [FIPS Pub. 197] and [RFC 4493] in combination with 1687 [ISO 10116] 94. 1688 Hierarchical to: No other components. 1689 Dependencies: [FDP_ITC.1 Import of user data without security attributes, 1690 or 1691 FDP_ITC.2 Import of user data with security attributes, or 1692 FCS_CKM.1 Cryptographic key generation], fulfilled by 1693 FCS_CKM.1/MTR 1694 FCS_CKM.4 Cryptographic key destruction 1695 Application Note 19: The ST allows different scenarios of key generation for 1696 Meter communication encryption. Those are: 1697 1. If a TLS encryption is being used, the key 1698 generation/negotiation is as defined by 1699 FCS_CKM.1/TLS. 1700 2. If AES encryption is being used, the key has been 1701 brought into the Gateway via a management 1702 function during the pairing process for the Meter 1703 91 [assignment: list of cryptographic operations] 92 [assignment: cryptographic algorithm] 93 [assignment: cryptographic key sizes] 94 [assignment: list of standards] page 87 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland (see FMT_SMF.1) as defined by 1704 FCS_COP.1/MTR. 1705 Application Note 20: If the connection between the Meter and TOE is 1706 unidirectional, the communication between the Meter and 1707 the TOE is secured by the use of a symmetric AES 1708 encryption. If a bidirectional connection between the Meter 1709 and the TOE is established, the communication is secured 1710 by a TLS channel as described in chapter 6.4.1. As the 1711 TOE shall be interoperable with all kind of Meters, both 1712 kinds of encryption are implemented. 1713 Application Note 21: The TOE uses only cryptographic specifications and 1714 algorithms as described in [TR-03109-3]. 1715 6.4.4 General Cryptographic support 1716 6.4.4.1 Cryptographic key management (FCS_CKM) 1717 6.4.4.1.1 FCS_CKM.4: Cryptographic key destruction 1718 FCS_CKM.4.1 The TSF shall destroy cryptographic keys in accordance 1719 with a specified cryptographic key destruction method 1720 Zeroisation 95 that meets the following: none 96. 1721 Hierarchical to: No other components. 1722 Dependencies: [FDP_ITC.1 Import of user data without security attributes, 1723 or 1724 FDP_ITC.2 Import of user data with security attributes, or 1725 FCS_CKM.1 Cryptographic key generation], fulfilled by 1726 FCS_CKM.1/TLS and 1727 FCS_CKM.1/CMS and FCS_CKM.1/MTR 1728 Application Note 22: Please note that as against the requirement FDP_RIP.2, 1729 the mechanisms implementing the requirement from 1730 FCS_CKM.4 shall be suitable to avoid attackers with 1731 95 [assignment: cryptographic key destruction method] 96 [assignment: list of standards] page 88 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland physical access to the TOE from accessing the keys after 1732 they are no longer used. 1733 6.4.4.2 Cryptographic operation (FCS_COP) 1734 6.4.4.2.1 FCS_COP.1/HASH: Cryptographic operation, hashing for 1735 signatures 1736 FCS_COP.1.1/HASH The TSF shall perform hashing for signature creation and 1737 verification 97 in accordance with a specified cryptographic 1738 algorithm SHA-256, SHA-384 and SHA-512 98 and 1739 cryptographic key sizes none 99 that meet the following: 1740 [FIPS Pub. 180-4]100. 1741 Hierarchical to: No other components. 1742 Dependencies: [FDP_ITC.1 Import of user data without security attributes, 1743 or 1744 FDP_ITC.2 Import of user data with security attributes, or 1745 FCS_CKM.1 Cryptographic key generation 101] 1746 FCS_CKM.4 Cryptographic key destruction 1747 Application Note 23: The TOE is only responsible for hashing of data in the 1748 context of digital signatures. The actual signature 1749 operation and the handling (i.e. protection) of the 1750 cryptographic keys in this context is performed by the 1751 Security Module. 1752 Application Note 24: The TOE uses only cryptographic specifications and 1753 algorithms as described in [TR-03109-3]. 1754 97 [assignment: list of cryptographic operations] 98 [assignment: cryptographic algorithm] 99 [assignment: cryptographic key sizes] 100 [assignment: list of standards] 101 The justification for the missing dependency FCS_CKM.1 can be found in chapter 6.12.1.3. page 89 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.4.4.2.2 FCS_COP.1/MEM: Cryptographic operation, encryption of 1755 TSF and user data 1756 FCS_COP.1.1/MEM The TSF shall perform TSF and user data encryption and 1757 decryption 102 in accordance with a specified cryptographic 1758 algorithm AES-XTS 103 and cryptographic key sizes 128 1759 bit 104 that meet the following: [FIPS Pub. 197] and 1760 [NIST 800-38E] 105. 1761 Hierarchical to: No other components. 1762 Dependencies: [FDP_ITC.1 Import of user data without security attributes, 1763 or 1764 FDP_ITC.2 Import of user data with security attributes, or 1765 FCS_CKM.1 Cryptographic key generation], not fulfilled s. 1766 Application Note 25 1767 FCS_CKM.4 Cryptographic key destruction 1768 Application Note 25: Please note that for the key generation process an external 1769 security module is used during TOE production. 1770 Application Note 26: The TOE encrypts its local TSF and user data while it is 1771 not in use (i.e. while stored in a persistent memory). 1772 It shall be noted that this kind of encryption cannot provide 1773 an absolute protection against physical manipulation and 1774 does not aim to. It however contributes to the security 1775 concept that considers the protection that is provided by 1776 the environment. 1777 102 [assignment: list of cryptographic operations] 103 [assignment: cryptographic algorithm] 104 [assignment: cryptographic key sizes] 105 [assignment: list of standards] page 90 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.5Class FDP: User Data Protection 1778 6.5.1 Introduction to the Security Functional Policies 1779 The security functional requirements that are used in the following chapters implicitly 1780 define a set of Security Functional Policies (SFP). These policies are introduced in the 1781 following paragraphs in more detail to facilitate the understanding of the SFRs: 1782 • The Gateway access SFP is an access control policy to control the access to 1783 objects under the control of the TOE. The details of this access control policy 1784 highly depend on the concrete application of the TOE. The access control policy 1785 is described in more detail in [TR-03109-1]. 1786 • The Firewall SFP implements an information flow policy to fulfil the objective 1787 O.Firewall. All requirements around the communication control that the TOE 1788 poses on communications between the different networks are defined in this 1789 policy. 1790 • The Meter SFP implements an information flow policy to fulfil the objective 1791 O.Meter. It defines all requirements concerning how the TOE shall handle Meter 1792 Data. 1793 6.5.2 Gateway Access SFP 1794 6.5.2.1 Access control policy (FDP_ACC) 1795 6.5.2.1.1 FDP_ACC.2: Complete access control 1796 FDP_ACC.2.1 The TSF shall enforce the Gateway access SFP 106 on 1797 subjects: external entities in WAN, HAN and LMN 1798 objects: any information that is sent to, from or via 1799 the TOE and any information that is stored in the 1800 TOE 107 and all operations among subjects and 1801 objects covered by the SFP. 1802 FDP_ACC.2.2 The TSF shall ensure that all operations between any 1803 subject controlled by the TSF and any object controlled by 1804 the TSF are covered by an access control SFP. 1805 106 [assignment: access control SFP] 107 [assignment: list of subjects and objects] page 91 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Hierarchical to: FDP_ACC.1 Subset access control 1806 Dependencies: FDP_ACF.1 Security attribute based access control 1807 6.5.2.1.2 FDP_ACF.1: Security attribute based access control 1808 FDP_ACF.1.1 The TSF shall enforce the Gateway access SFP 108 to 1809 objects based on the following: 1810 subjects: external entities on the WAN, HAN or 1811 LMN side 1812 objects: any information that is sent to, from or via 1813 the TOE 1814 attributes: destination interface 109. 1815 FDP_ACF.1.2 The TSF shall enforce the following rules to determine if 1816 an operation among controlled subjects and controlled 1817 objects is allowed: 1818 • an authorised Consumer is only allowed to have 1819 read access to his own User Data via the interface 1820 IF_GW_CON, 1821 • an authorised Service Technician is only allowed to 1822 have read access to the system log via the interface 1823 IF_GW_SRV, the Service Technician must not be 1824 allowed to read, modify or delete any other TSF 1825 data, 1826 • an authorised Gateway Administrator is allowed to 1827 interact with the TOE only via IF_GW_WAN, 1828 • only authorised Gateway Administrators are 1829 allowed to establish a wake-up call, 1830 • additional rules governing access among controlled 1831 subjects and controlled objects using controlled 1832 108 [assignment: access control SFP] 109 [assignment: list of subjects and objects controlled under the indicated SFP, and for each, the SFP-relevant security attributes, or named groups of SFP-relevant security attributes] page 92 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland operations on controlled objects or none: 1833 none 110. 111 1834 FDP_ACF.1.3 The TSF shall explicitly authorise access of subjects to 1835 objects based on the following additional rules: none 112. 1836 FDP_ACF.1.4 The TSF shall explicitly deny access of subjects to objects 1837 based on the following additional rules: 1838 • the Gateway Administrator is not allowed to read 1839 consumption data or the Consumer Log, 1840 • nobody must be allowed to read the symmetric 1841 keys used for encryption 113. 1842 Hierarchical to: No other components 1843 Dependencies: FDP_ACC.1 Subset access control 1844 FMT_MSA.3 Static attribute initialisation 1845 6.5.3 Firewall SFP 1846 6.5.3.1 Information flow control policy (FDP_IFC) 1847 6.5.3.1.1 FDP_IFC.2/FW: Complete information flow control for 1848 firewall 1849 FDP_IFC.2.1/FW The TSF shall enforce the Firewall SFP 114 on the TOE, 1850 external entities on the WAN side, external entities on the 1851 LAN side and all information flowing between them 115 and 1852 all operations that cause that information to flow to and 1853 from subjects covered by the SFP. 1854 110 [assignment: additional rules governing access among controlled subjects and controlled objects using controlled operations on controlled objects or none] 111 [assignment: rules governing access among controlled subjects and controlled objects using controlled operations on controlled objects] 112 [assignment: rules, based on security attributes, that explicitly authorise access of subjects to objects] 113 [assignment: rules, based on security attributes, that explicitly deny access of subjects to objects] 114 [assignment: information flow control SFP] 115 [assignment: list of subjects and information] page 93 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FDP_IFC.2.2/FW The TSF shall ensure that all operations that cause any 1855 information in the TOE to flow to and from any subject in 1856 the TOE are covered by an information flow control SFP. 1857 Hierarchical to: FDP_IFC.1 Subset information flow control 1858 Dependencies: FDP_IFF.1 Simple security attributes 1859 6.5.3.2 Information flow control functions (FDP_IFF) 1860 6.5.3.2.1 FDP_IFF.1/FW: Simple security attributes for Firewall 1861 FDP_IFF.1.1/FW The TSF shall enforce the Firewall SFP 116 based on the 1862 following types of subject and information security 1863 attributes: 1864 subjects: The TOE and external entities on the 1865 WAN, HAN or LMN side 1866 information: any information that is sent to, from or 1867 via the TOE 1868 attributes: destination_interface (TOE, LMN, HAN 1869 or WAN), source_interface (TOE, LMN, HAN or 1870 WAN), destination_authenticated, 1871 source_authenticated 117. 1872 FDP_IFF.1.2/FW The TSF shall permit an information flow between a 1873 controlled subject and controlled information via a 1874 controlled operation if the following rules hold: 1875 (if source_interface=HAN or 1876 source_interface=TOE) and 1877 destination_interface=WAN and 1878 destination_authenticated = true 1879 Connection establishment is allowed 1880 1881 116 [assignment: information flow control SFP] 117 [assignment: list of subjects and information controlled under the indicated SFP, and for each, the security attributes] page 94 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland if source_interface=LMN and 1882 destination_interface= TOE and 1883 source_authenticated = true 1884 Connection establishment is allowed 1885 1886 if source_interface=TOE and 1887 destination_interface= LMN and 1888 destination_authenticated = true 1889 Connection establishment is allowed 1890 1891 if source_interface=HAN and 1892 destination_interface= TOE and 1893 source_authenticated = true 1894 Connection establishment is allowed 1895 1896 if source_interface=TOE and 1897 destination_interface= HAN and 1898 destination_authenticated = true 1899 Connection establishment is allowed 1900 else 1901 Connection establishment is denied 118. 1902 FDP_IFF.1.3/FW The TSF shall enforce the establishment of a connection 1903 to a configured external entity in the WAN after having 1904 received a wake-up message on the WAN interface 119. 1905 118 [assignment: for each operation, the security attribute-based relationship that must hold between subject and information security attributes] 119 [assignment: additional information flow control SFP rules] page 95 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FDP_IFF.1.4/FW The TSF shall explicitly authorise an information flow 1906 based on the following rules: none 120. 1907 FDP_IFF.1.5/FW The TSF shall explicitly deny an information flow based on 1908 the following rules: none 121. 1909 Hierarchical to: No other components 1910 Dependencies: FDP_IFC.1 Subset information flow control 1911 FMT_MSA.3 Static attribute initialisation 1912 Application Note 27: It should be noted that the FDP_IFF.1.1/FW facilitates 1913 different interfaces of the origin and the destination of an 1914 information flow implicitly requires the TOE to implement 1915 physically separate ports for WAN, LMN and HAN. 1916 6.5.4 Meter SFP 1917 6.5.4.1 Information flow control policy (FDP_IFC) 1918 6.5.4.1.1 FDP_IFC.2/MTR: Complete information flow control for 1919 Meter information flow 1920 FDP_IFC.2.1/MTR The TSF shall enforce the Meter SFP 122 on the TOE, 1921 attached Meters, authorized External Entities in the WAN 1922 and all information flowing between them 123 and all 1923 operations that cause that information to flow to and from 1924 subjects covered by the SFP. 1925 FDP_IFC.2.2/MTR The TSF shall ensure that all operations that cause any 1926 information in the TOE to flow to and from any subject in 1927 the TOE are covered by an information flow control SFP. 1928 Hierarchical to: FDP_IFC.1 Subset information flow control 1929 Dependencies: FDP_IFF.1 Simple security attributes 1930 120 [assignment: rules, based on security attributes, that explicitly authorise information flows] 121 [assignment: rules, based on security attributes, that explicitly deny information flows] 122 [assignment: information flow control SFP] 123 [assignment: list of subjects and information] page 96 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.5.4.2 Information flow control functions (FDP_IFF) 1931 6.5.4.2.1 FDP_IFF.1/MTR: Simple security attributes for Meter 1932 information 1933 FDP_IFF.1.1/MTR The TSF shall enforce the Meter SFP 124 based on the 1934 following types of subject and information security 1935 attributes: 1936 • subjects: TOE, external entities in WAN, Meters 1937 located in LMN 1938 • information: any information that is sent via the 1939 TOE 1940 • attributes: destination interface, source interface 1941 (LMN or WAN), Processing Profile 125. 1942 FDP_IFF.1.2/MTR The TSF shall permit an information flow between a 1943 controlled subject and controlled information via a 1944 controlled operation if the following rules hold: 1945 • an information flow shall only be initiated if allowed 1946 by a corresponding Processing Profile 126. 1947 FDP_IFF.1.3/MTR The TSF shall enforce the following rules: 1948 • Data received from Meters shall be processed as 1949 defined in the corresponding Processing Profiles, 1950 • Results of processing of Meter Data shall be 1951 submitted to external entities as defined in the 1952 Processing Profiles, 1953 • The internal system time shall be synchronised as 1954 follows: 1955 124 [assignment: information flow control SFP] 125 [assignment: list of subjects and information controlled under the indicated SFP, and for each, the security attributes] 126 [assignment: for each operation, the security attribute-based relationship that must hold between subject and information security attributes] page 97 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland o The TOE shall compare the system time to a 1956 reliable external time source every 24 1957 hours 127. 1958 o If the deviation between the local time and the 1959 remote time is acceptable 128 , the local system 1960 time shall be updated according to the remote 1961 time. 1962 o If the deviation is not acceptable the TOE 1963 shall ensure that any following Meter Data is 1964 not used, stop operation 129 and 1965 inform a Gateway Administrator 130. 1966 FDP_IFF.1.4/MTR The TSF shall explicitly authorise an information flow 1967 based on the following rules: none 131. 1968 FDP_IFF.1.5/MTR The TSF shall explicitly deny an information flow based on 1969 the following rules: The TOE shall deny any acceptance of 1970 information by external entities in the LMN unless the 1971 authenticity, integrity and confidentiality of the Meter Data 1972 could be verified 132. 1973 Hierarchical to: No other components 1974 Dependencies: FDP_IFC.1 Subset information flow control 1975 FMT_MSA.3 Static attribute initialisation 1976 Application Note 28: FDP_IFF.1.3 defines that the TOE shall update the local 1977 system time regularly with reliable external time sources if 1978 the deviation is acceptable. In the context of this 1979 functionality two aspects should be mentioned: 1980 127 [assignment: synchronization interval between 1 minute and 24 hours] 128 Please refer to the following application note for a detailed definition of “acceptable”. 129 Please note that this refers to the complete functional operation of the TOE and not only to the update of local time. However, an administrative access shall still be possible. 130 [assignment: additional information flow control SFP rules] 131 [assignment: rules, based on security attributes, that explicitly authorise information flows] 132 [assignment: rules, based on security attributes, that explicitly deny information flows] page 98 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Reliability of external source 1981 There are several ways to achieve the reliability of the 1982 external source. On the one hand, there may be a source 1983 in the WAN that has an acceptable reliability on its own 1984 (e.g. because it is operated by a very trustworthy 1985 organisation (an official legal time issued by the calibration 1986 authority would be a good example for such a source133)). 1987 On the other hand a developer may choose to maintain 1988 multiple external sources that all have a certain level of 1989 reliability but no absolute reliability. When using such 1990 sources the TOE shall contact more than one source and 1991 harmonize the results in order to ensure that no attack 1992 happened. 1993 Acceptable deviation 1994 For the question whether a deviation between the time 1995 source(s) in the WAN and the local system time is still 1996 acceptable, normative or legislative regulations shall be 1997 considered. If no regulation exists, a maximum deviation of 1998 3% of the measuring period is allowed to be in 1999 conformance with [PP_GW]. It should be noted that 2000 depending on the kind of application a more accurate 2001 system time is needed. For doing so, the intervall for the 2002 comparison of the system time to a reliable external time 2003 source is configurable. But this aspect is not within the 2004 scope of this Security Target. 2005 Please further note that – depending on the exactness of 2006 the local clock – it may be required to synchronize the time 2007 more often than every 24 hours. 2008 Application Note 29: In FDP_IFF.1.5/MTR the TOE is required to verify the 2009 authenticity, integrity and confidentiality of the Meter Data 2010 133 By the time that this ST is developed however, this time source is not yet available. page 99 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland received from the Meter. The TOE has two options to do 2011 so: 2012 1. To implement a channel between the Meter and the 2013 TOE using the functionality as described in 2014 FCS_COP.1/TLS. 2015 2. To accept, decrypt and verify data that has been 2016 encrypted by the Meter as required in 2017 FCS_COP.1/MTR if a wireless connection to the 2018 meters is established. 2019 The latter possibility can be used only if a wireless 2020 connection between the Meter and the TOE is established. 2021 6.5.5 General Requirements on user data protection 2022 6.5.5.1 Residual information protection (FDP_RIP) 2023 6.5.5.1.1 FDP_RIP.2: Full residual information protection 2024 FDP_RIP.2.1 The TSF shall ensure that any previous information 2025 content of a resource is made unavailable upon the 2026 deallocation of the resource from 134 all objects. 2027 Hierarchical to: FDP_RIP.1 Subset residual information protection 2028 Dependencies: No dependencies. 2029 Application Note 30: Please refer to chapter F.9 of part 2 of [CC] for more 2030 detailed information about what kind of information this 2031 requirement applies to. 2032 Please further note that this SFR has been used in order 2033 to ensure that information that is no longer used is made 2034 unavailable from a logical perspective. Specifically, it has 2035 to be ensured that this information is no longer available 2036 via an external interface (even if an access control or 2037 information flow policy would fail). However, this does not 2038 necessarily mean that the information is overwritten in a 2039 134 [selection: allocation of the resource to, deallocation of the resource from] page 100 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland way that makes it impossible for an attacker to get access 2040 to is assuming a physical access to the memory of the 2041 TOE. 2042 6.5.5.2 Stored data integrity (FDP_SDI) 2043 6.5.5.2.1 FDP_SDI.2: Stored data integrity monitoring and action 2044 FDP_SDI.2.1 The TSF shall monitor user data stored in containers 2045 controlled by the TSF for integrity errors 135 on all objects, 2046 based on the following attributes: cryptographical check 2047 sum 136. 2048 FDP_SDI.2.2 Upon detection of a data integrity error, the TSF shall 2049 create a system log entry137. 2050 Hierarchical to: FDP_SDI.1 Stored data integrity monitoring 2051 Dependencies: No dependencies. 2052 6.6Class FIA: Identification and Authentication 2053 6.6.1 User Attribute Definition (FIA_ATD) 2054 6.6.1.1 FIA_ATD.1: User attribute definition 2055 FIA_ATD.1.1 The TSF shall maintain the following list of security 2056 attributes belonging to individual users: 2057 • User Identity 2058 • Status of Identity (Authenticated or not) 2059 • Connecting network (WAN, HAN or LMN) 2060 • Role membership 2061 • none 138. 2062 Hierarchical to: No other components. 2063 Dependencies: No dependencies. 2064 135 [assignment: integrity errors] 136 [assignment: user data attributes] 137 [assignment: action to be taken] 138 [assignment: list of security attributes] page 101 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.6.2 Authentication Failures (FIA_AFL) 2065 6.6.2.1 FIA_AFL.1: Authentication failure handling 2066 FIA_AFL.1.1 The TSF shall detect when 5 139 unsuccessful 2067 authentication attempts occur related to authentication 2068 attempts at IF_GW_CON 140. 2069 FIA_AFL.1.2 When the defined number of unsuccessful authentication 2070 attempts has been met 141, the TSF shall block 2071 IF_GW_CON for 5 minutes 142. 2072 Hierarchical to: No other components 2073 Dependencies: FIA_UAU.1 Timing of authentication 2074 6.6.3 User Authentication (FIA_UAU) 2075 6.6.3.1 FIA_UAU.2: User authentication before any action 2076 FIA_UAU.2.1 The TSF shall require each user to be successfully 2077 authenticated before allowing any other TSF-mediated 2078 actions on behalf of that user. 2079 Hierarchical to: FIA_UAU.1 2080 Dependencies: FIA_UID.1 Timing of identification 2081 Application Note 31: Please refer to [TR-03109-1] for a more detailed overview 2082 on the authentication of TOE users. 2083 6.6.3.2 FIA_UAU.5: Multiple authentication mechanisms 2084 FIA_UAU.5.1 The TSF shall provide 2085 • authentication via certificates at the IF_GW_MTR 2086 interface 2087 • TLS-authentication via certificates at the 2088 IF_GW_WAN interface 2089 139 [selection: [assignment: positive integer number], an administrator configurable positive integer within [assignment: range of acceptable values]] 140 [assignment: list of authentication events] 141 [selection: met, surpassed] 142 [assignment: list of actions] page 102 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland • TLS-authentication via HAN-certificates at the 2090 IF_GW_CON interface 2091 • authentication via password at the IF_GW_CON 2092 interface 2093 • TLS-authentication via HAN-certificates at the 2094 IF_GW_SRV interface 2095 • authentication at the IF_GW_CLS interface 2096 • verification via a commands' signature 143 2097 to support user authentication. 2098 FIA_UAU.5.2 The TSF shall authenticate any user's claimed identity 2099 according to the 2100 • meters shall be authenticated via certificates at the 2101 IF_GW_MTR interface only 2102 • Gateway Administrators shall be authenticated via 2103 TLS-certificates at the IF_GW_WAN interface only 2104 • Consumers shall be authenticated via TLS- 2105 certificates or via password at the IF_GW_CON 2106 interface only 2107 • Service Technicians shall be authenticated via 2108 TLS-certificates at the IF_GW_SRV interface only 2109 • CLS shall be authenticated at the IF_GW_CLS only 2110 • each command of an Gateway Administrator shall 2111 be authenticated by verification of the commands' 2112 signature, 2113 • other external entities shall be authenticated via 2114 TLS-certificates at the IF_GW_WAN interface 2115 only 144. 2116 143 [assignment: list of multiple authentication mechanisms] 144 [assignment: rules describing how the multiple authentication mechanisms provide authentication] page 103 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Hierarchical to: No other components. 2117 Dependencies: No dependencies. 2118 Application Note 32: Please refer to [TR-03109-1] for a more detailed overview 2119 on the authentication of TOE users. 2120 6.6.3.3 FIA_UAU.6: Re-authenticating 2121 FIA_UAU.6.1 The TSF shall re-authenticate an external entity 145 under 2122 the conditions 2123 • TLS channel to the WAN shall be disconnected 2124 after 48 hours, 2125 • TLS channel to the LMN shall be disconnected after 2126 5 MB of transmitted information, 2127 • other local users shall be re-authenticated after at 2128 least 10 minutes146 of inactivity 147. 2129 Hierarchical to: No other components. 2130 Dependencies: No dependencies. 2131 Application Note 33: This requirement on re-authentication for external entities 2132 in the WAN and LMN is addressed by disconnecting the 2133 TLS channel even though a re-authentication is - strictly 2134 speaking - only achieved if the TLS channel is build up 2135 again. 2136 6.6.4 User identification (FIA_UID) 2137 6.6.4.1 FIA_UID.2: User identification before any action 2138 FIA_UID.2.1 The TSF shall require each user to be successfully 2139 identified before allowing any other TSF-mediated actions 2140 on behalf of that user. 2141 Hierarchical to: FIA_UID.1 2142 Dependencies: No dependencies. 2143 145 [refinement: the user] 146 [refinement: after at least 10 minutes]. This value is configurable by the authorised Gateway Administrator. 147 [assignment: list of conditions under which re-authentication is required] page 104 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.6.5 User-subject binding (FIA_USB) 2144 6.6.5.1 FIA_USB.1: User-subject binding 2145 FIA_USB.1.1 The TSF shall associate the following user security 2146 attributes with subjects acting on the behalf of that user: 2147 attributes as defined in FIA_ATD.1 148. 2148 FIA_USB.1.2 The TSF shall enforce the following rules on the initial 2149 association of user security attributes with subjects acting 2150 on the behalf of users: 2151 • The initial value of the security attribute ‘connecting 2152 network’ is set to the corresponding physical 2153 interface of the TOE (HAN, WAN, or LMN). 2154 • The initial value of the security attribute ‘role 2155 membership’ is set to the user role claimed on basis 2156 of the credentials used for authentication at the 2157 connecting network as defined in FIA_UAU.5.2. For 2158 role membership ‘Gateway Administrators’, 2159 additionally the remote network endpoint 149used 2160 and configured in the TSF data must be identical. 2161 • The initial value of the security attribute ‘user 2162 identity’ is set to the identification attribute of the 2163 credentials used by the subject. The security 2164 attribute ‘user identity’ is set to the subject key ID of 2165 the certificate in case of a certificate-based 2166 authentication, the meter-ID for wired Meters and 2167 the user name owner in case of a password-based 2168 authentication at interface IF_GW_CON. 2169 • The initial value of the security attribute ‘status of 2170 identity’ is set to the authentication status of the 2171 claimed identity. If the authentication is successful 2172 on basis of the used credentials, the status of 2173 148 [assignment: list of user security attributes] 149 The remote network endpoint can be either the remote IP address or the remote host name. page 105 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland identity is ‘authenticated’, otherwise it is 2174 ‘not authenticated’ 150. 2175 FIA_USB.1.3 The TSF shall enforce the following rules governing 2176 changes to the user security attributes associated with 2177 subjects acting on the behalf of users: 2178 • security attribute ‘connecting network’ is not 2179 changeable. 2180 • security attribute ‘role membership’ is not 2181 changeable. 2182 • security attribute ‘user identity’ is not changeable. 2183 • security attribute ‘status of identity’ is not 2184 changeable151. 2185 Hierarchical to: No other components. 2186 Dependencies: FIA_ATD.1 User attribute definition 2187 6.7Class FMT: Security Management 2188 6.7.1 Management of the TSF 2189 6.7.1.1 Management of functions in TSF (FMT_MOF) 2190 6.7.1.1.1 FMT_MOF.1: Management of security functions 2191 behaviour 2192 FMT_MOF.1.1 The TSF shall restrict the ability to modify the behaviour 2193 of 152 the functions for management as defined in 2194 150 [assignment: rules for the initial association of attributes] 151 [assignment: rules for the changing of attributes] 152 [selection: determine the behaviour of, disable, enable, modify the behaviour of] page 106 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FMT_SMF.1 153 to roles and criteria as defined in Table 2195 13 154. 2196 Hierarchical to: No other components. 2197 Dependencies: FMT_SMR.1 Security roles 2198 FMT_SMF.1 Specification of Management Functions 2199 Table 13: Restrictions on Management Functions 2200 153 [assignment: list of functions] 154 [assignment: the authorised identified roles] 155 The TOE displays the version number of the TOE and the current time of the TOE also to the authorized service techni- cian via the interface IF_GW_SRV because the service technician must be able to determine if the current time of the TOE is correct or if the version number of the TOE is correct. 156 This criterion applies to all management functions. The following entries in this table only augment this restriction further. Function Limitation Display the version number of the TOE Display the current time The management functions must only be accessible for an authorised Consumer and only via the interface IF_GW_CON. An authorized Service Technician is also able to access the version numer of the TOE and the current time of the TOE via interface IF_GW_SRV 155. All other management functions as defined in FMT_SMF.1 The management functions must only be accessible for an authorised Gateway Administrator and only via the interface IF_GW_WAN 156. Firmware Update The firmware update must only be possible after the authenticity of the firmware update has been verified (using the services of the Security Module and the trust anchor of the Gateway developer) and if the version number of the new firmware is higher to the version of the installed firmware. Deletion or modification of events from the Calibration Log A deletion or modification of events from the calibration log must not be possible. page 107 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.7.1.2 Specification of Management Functions (FMT_SMF) 2201 6.7.1.2.1 FMT_SMF.1: Specification of Management Functions 2202 FMT_SMF.1.1 The TSF shall be capable of performing the following 2203 management functions: list of management functions as 2204 defined in Table 14 and Table 15 and additional 2205 functionalities: none 157. 2206 Hierarchical to: No other components. 2207 Dependencies: No dependencies. 2208 157 [assignment: list of management functions to be provided by the TSF] 158 The TOE does not have the indicated management ability since there exist no standard method calls for the Gateway Administrator to enforce such management ability. 159 As the rules for audit review are fixed within [PP_GW], the management functions as defined by [CC, part 2] do not apply. SFR Management functionality FAU_ARP.1/SYS • The management (addition, removal, or modification) of actions 158 FAU_GEN.1/SYS FAU_GEN.1/CON FAU_GEN.1/CAL - FAU_SAA.1/SYS • Maintenance of the rules by (adding, modifying, deletion) of rules from the set of rules 158 FAU_SAR.1/SYS FAU_SAR.1/CON FAU_SAR.1/CAL - 159 FAU_STG.4/SYS FAU_STG.4/CON • Maintenance (deletion, modification, addition) of actions to be taken in case of audit storage failure 158 • Size configuration of the audit trail that is available before the oldest events get overwritten 158 page 108 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 160 As the actions that shall be performed if the audit trail is full are fixed within [PP_GW], the management functions as defined by [CC, part 2] do not apply. FAU_STG.4/CAL - 160 FAU_GEN.2 - FAU_STG.2 • Maintenance of the parameters that control the audit storage capability for the consumer log and the system log 158 FCO_NRO.2 • The management of changes to information types, fields, 158 originator attributes and recipients of evidence FCS_CKM.1/TLS - FCS_COP.1/TLS • Management of key material including key material stored in the Security Module FCS_CKM.1/CMS - FCS_COP.1/CMS • Management of key material including key material stored in the Security Module FCS_CKM.1/MTR - FCS_COP.1/MTR • Management of key material stored in the Security Module and key material brought into the gateway during the pairing process FCS_CKM.4 - FCS_COP.1/HASH - FCS_COP.1/MEM • Management of key material FDP_ACC.2 - FDP_ACF.1 - FDP_IFC.2/FW - page 109 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 161 In the assignment it is not indicated that the authorized Gateway Administrator might be able to define additional security attributes for users. 162 As the rules for re-authentication are fixed within [PP_GW], the management functions as defined by [CC, part 2] do not apply. FDP_IFF.1/FW • Managing the attributes used to make explicit access based decisions • Add authorised units for communication (pairing) • Management of endpoint to be contacted after successful wake-up call • Management of CLS systems FDP_IFC.2/MTR - FDP_IFF.1/MTR • Managing the attributes (including Processing Profiles) used to make explicit access based decisions FDP_RIP.2 - FDP_SDI.2 • The actions to be taken upon the detection of an integrity error shall be configurable. 158 FIA_ATD.1 • If so indicated in the assignment, the authorised Gateway Administrator might be able to define additional security attributes for users161. FIA_AFL.1 • Management of the threshold for unsuccessful authentication attempts 158 • Management of actions to be taken in the event of an authentication failure 158 FIA_UAU.2 • Management of the authentication data by an Gateway Administrator FIA_UAU.5 - 162 FIA_UAU.6 • Management of re-authentication time page 110 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 163 As the role that can interact with the security attributes is restricted to the Gateway Administrator within [PP_GW], not all management functions as defined by [CC, part 2] do apply. 164 As no role is allowed to specify alternative initial values within [PP_GW], the management functions as defined by [CC, part 2] do not apply. 165 As the role that can read, modify, delete or add the security attributes is restricted to the Gateway Administrator within [PP_GW], not all management functions as defined by [CC, part 2] do apply. 166 As no role is allowed to specify alternative initial values within [PP_GW], the management functions as defined by [CC, part 2] do not apply. 167 As the role that can read, modify, delete or add the security attributes is restricted to the Gateway Administrator within [PP_GW], not all management functions as defined by [CC, part 2] do apply. FIA_UID.2 • The management of the user identities FIA_USB.1 • An authorised Gateway Administrator can define default subject security attributes, if so indicated in the assignment of FIA_ATD.1. 158 • An authorised Gateway Administrator can change subject security attributes, if so indicated in the assignment of FIA_ATD.1. 158 FMT_MOF.1 • Managing the group of roles that can interact with the functions in the TSF FMT_SMF.1 - FMT_SMR.1 • Managing the group of users that are part of a role FMT_MSA.1/AC • Management of rules by which security attributes inherit specified values 163 158 FMT_MSA.3/AC - 164 FMT_MSA.1/FW • Management of rules by which security attributes inherit specified values 165 158 FMT_MSA.3/FW - 166 FMT_MSA.1/MTR • Management of rules by which security attributes inherit specified values 167 158 page 111 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 14: SFR related Management Functionalities 2209 168 As no role is allowed to specify alternative initial values within [PP_GW], the management functions as defined by [CC, part 2] do not apply. 169 As the rules for TSF testing are fixed within [PP_GW], the management functions as defined by [CC, part 2] do not apply. 170 As the configuration of the actions that require a trusted channel is fixed by [PP_GW], the management functions as defined in [CC, part 2] do not apply. 171 As the configuration of the actions that require a trusted channel is fixed by [PP_GW], the management functions as defined in [CC, part 2] do not apply. 172 As the configuration of the actions that require a trusted channel is fixed by [PP_GW], the management functions as defined in [CC, part 2] do not apply. FMT_MSA.3/MTR - 168 FPR_CON.1 • Definition of the interval in FPR_CON.1.2 if definable within the operational phase of the TOE 158 FPR_PSE.1 - FPT_FLS.1 - FPT_RPL.1 - FPT_STM.1 • Management a time source FPT_TST.1 - 169 FPT_PHP.1 • Management of the user or role that determines whether physical tampering has occurred 158 FTP_ITC.1/WAN - 170 FTP_ITC.1/MTR - 171 FTP_ITC.1/USR - 172 page 112 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 2210 Table 15: Gateway specific Management Functionalities 2211 6.7.2 Security management roles (FMT_SMR) 2212 6.7.2.1 FMT_SMR.1: Security roles 2213 FMT_SMR.1.1 The TSF shall maintain the roles authorised Consumer, 2214 authorised Gateway Administrator, authorised Service 2215 Technician, the authorised identified roles: authorised 2216 external entity, CLS, and Meter 174. 2217 FMT_SMR.1.2 The TSF shall be able to associate users with roles. 2218 Hierarchical to: No other components. 2219 Dependencies: No dependencies. 2220 173 Resetting the TOE will be necessary when the TOE stopped operation due to a critical deviation between local and remote time (see FDP_IFF.1.3/MTR)or when the calibration log is full. 174 [assignment: the authorised identified roles] Gateway specific Management functionality Pairing of a Meter Performing a firmware update Displaying the current version number of the TOE Displaying the current time Management of certificates of external entities in the WAN for communication Resetting of the TOE 173 page 113 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.7.3 Management of security attributes for Gateway access SFP 2221 6.7.3.1 Management of security attributes (FMT_MSA) 2222 6.7.3.1.1 FMT_MSA.1/AC: Management of security attributes for 2223 Gateway access SFP 2224 FMT_MSA.1.1/AC The TSF shall enforce the Gateway access SFP 175 to 2225 restrict the ability to query, modify, delete, other 2226 operations: none 176 the security attributes all relevant 2227 security attributes 177 to authorised Gateway 2228 Administrators 178. 2229 Hierarchical to: No other components. 2230 Dependencies: [FDP_ACC.1 Subset access control, or 2231 FDP_IFC.1 Subset information flow control], fulfilled by 2232 FDP_ACC.2 2233 FMT_SMR.1 Security roles 2234 FMT_SMF.1 Specification of Management Functions 2235 6.7.3.1.2 FMT_MSA.3/AC: Static attribute initialisation for Gateway 2236 access SFP 2237 FMT_MSA.3.1/AC The TSF shall enforce the Gateway access SFP 179 to 2238 provide restrictive 180 default values for security attributes 2239 that are used to enforce the SFP. 2240 FMT_MSA.3.2/AC The TSF shall allow the no role 181 to specify alternative 2241 initial values to override the default values when an object 2242 or information is created. 2243 175 [assignment: access control SFP(s), information flow control SFP(s)] 176 [selection: change_default, query, modify, delete, [assignment: other operations]] 177 [assignment: list of security attributes] 178 [assignment: the authorised identified roles] 179 [assignment: access control SFP, information flow control SFP] 180 [selection, choose one of: restrictive, permissive, [assignment: other property]] 181 [assignment: the authorised identified roles] page 114 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Hierarchical to: No other components. 2244 Dependencies: FMT_MSA.1 Management of security attributes 2245 FMT_SMR.1 Security roles 2246 6.7.4 Management of security attributes for Firewall SFP 2247 6.7.4.1 Management of security attributes (FMT_MSA) 2248 6.7.4.1.1 FMT_MSA.1/FW: Management of security attributes for 2249 firewall policy 2250 FMT_MSA.1.1/FW The TSF shall enforce the Firewall SFP 182 to restrict the 2251 ability to query, modify, delete, other operations: none 183 2252 the security attributes all relevant security attributes 184 to 2253 authorised Gateway Administrators 185. 2254 Hierarchical to: No other components. 2255 Dependencies: [FDP_ACC.1 Subset access control, or 2256 FDP_IFC.1 Subset information flow control], fulfilled by 2257 FDP_IFC.2/FW 2258 FMT_SMR.1 Security roles 2259 FMT_SMF.1 Specification of Management Functions 2260 6.7.4.1.2 FMT_MSA.3/FW: Static attribute initialisation for Firewall 2261 policy 2262 FMT_MSA.3.1/FW The TSF shall enforce the Firewall SFP 186 to provide 2263 restrictive 187 default values for security attributes that are 2264 used to enforce the SFP. 2265 182 [assignment: access control SFP(s), information flow control SFP(s)] 183 [selection: change_default, query, modify, delete, [assignment: other operations]] 184 [assignment: list of security attributes] 185 [assignment: the authorised identified roles] 186 [assignment: access control SFP, information flow control SFP] 187 [selection, choose one of: restrictive, permissive, [assignment: other property]] page 115 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FMT_MSA.3.2/FW The TSF shall allow the no role 188 to specify alternative 2266 initial values to override the default values when an object 2267 or information is created. 2268 Hierarchical to: No other components. 2269 Dependencies: FMT_MSA.1 Management of security attributes 2270 FMT_SMR.1 Security roles 2271 Application Note 34: The definition of restrictive default rules for the firewall 2272 information flow policy refers to the rules as defined in 2273 FDP_IFF.1.2/FW and FDP_IFF.1.5/FW. Those rules apply 2274 to all information flows and must not be overwritable by 2275 anybody. 2276 6.7.5 Management of security attributes for Meter SFP 2277 6.7.5.1 Management of security attributes (FMT_MSA) 2278 6.7.5.1.1 FMT_MSA.1/MTR: Management of security attributes for 2279 Meter policy 2280 FMT_MSA.1.1/MTR The TSF shall enforce the Meter SFP 189 to restrict the 2281 ability to change_default, query, modify, delete, other 2282 operations: none 190 the security attributes all relevant 2283 security attributes 191 to authorised Gateway 2284 Administrators 192. 2285 Hierarchical to: No other components. 2286 Dependencies: [FDP_ACC.1 Subset access control, or 2287 FDP_IFC.1 Subset information flow control], fulfilled by 2288 FDP_IFC.2/FW 2289 FMT_SMR.1 Security roles 2290 188 [assignment: the authorised identified roles] 189 [assignment: access control SFP(s), information flow control SFP(s)] 190 [selection: change_default, query, modify, delete, [assignment: other operations]] 191 [assignment: list of security attributes] 192 [assignment: the authorised identified roles] page 116 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FMT_SMF.1 Specification of Management Functions 2291 6.7.5.1.2 FMT_MSA.3/MTR: Static attribute initialisation for Meter 2292 policy 2293 FMT_MSA.3.1/MTR The TSF shall enforce the Meter SFP 193 to provide 2294 restrictive 194 default values for security attributes that are 2295 used to enforce the SFP. 2296 FMT_MSA.3.2/MTR The TSF shall allow the no role 195 to specify alternative 2297 initial values to override the default values when an object 2298 or information is created. 2299 Hierarchical to: No other components. 2300 Dependencies: FMT_MSA.1 Management of security attributes 2301 FMT_SMR.1 Security roles 2302 2303 6.8Class FPR: Privacy 2304 6.8.1 Communication Concealing (FPR_CON) 2305 6.8.1.1 FPR_CON.1: Communication Concealing 2306 FPR_CON.1.1 The TSF shall enforce the Firewall SFP 196 in order to 2307 ensure that no personally identifiable information (PII) can 2308 be obtained by an analysis of frequency, load, size or the 2309 absence of external communication 197. 2310 FPR_CON.1.2 The TSF shall connect to the Gateway Administrator, 2311 authorized External Entity in the WAN 198 in intervals as 2312 193 [assignment: access control SFP, information flow control SFP] 194 [selection, choose one of: restrictive, permissive, [assignment: other property]] 195 [assignment: the authorised identified roles] 196 [assignment: information flow policy] 197 [assignment: characteristics of the information flow that need to be concealed] 198 [assignment: list of external entities] page 117 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland follows daily, other interval: none 199 to conceal the data 2313 flow200. 2314 Hierarchical to: No other components. 2315 Dependencies: No dependencies. 2316 6.8.2 Pseudonymity (FPR_PSE) 2317 6.8.2.1 FPR_PSE.1 Pseudonymity 2318 FPR_PSE.1.1 The TSF shall ensure that external entities in the WAN 201 2319 are unable to determine the real user name bound to 2320 information neither relevant for billing nor for a secure 2321 operation of the Grid sent to parties in the WAN 202. 2322 FPR_PSE.1.2 The TSF shall be able to provide aliases as defined by the 2323 Processing Profiles 203 of the real user name for the 2324 Meter and Gateway identity 204 to external entities in the 2325 WAN 205. 2326 FPR_PSE.1.3 The TSF shall determine an alias for a user 206 and verify 2327 that it conforms to the alias given by the Gateway 2328 Administrator in the Processing Profile207. 2329 Hierarchical to: No other components. 2330 Dependencies: No dependencies. 2331 Application Note 35: When the TOE submits information about the consumption 2332 or production of a certain commodity that is not relevant for 2333 the billing process nor for a secure operation of the Grid, 2334 there is no need that this information is sent with a direct 2335 199 [selection: weekly, daily, hourly, [assignment: other interval]] 200 The TOE uses a randomized value of about ±50 percent per delivery. 201 [assignment: set of users and/or subjects] 202 [assignment: list of subjects and/or operations and/or objects] 203 [assignment: number of aliases] 204 [refinement: of the real user name] 205 [assignment: list of subjects] 206 [selection, choose one of: determine an alias for a user, accept the alias from the user] 207 [assignment: alias metric] page 118 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland link to the identity of the consumer. In those cases, the 2336 TOE shall replace the identity of the Consumer by a 2337 pseudonymous identifier. Please note that the identity of 2338 the Consumer may not be their name but could also be a 2339 number (e.g. consumer ID) used for billing purposes. 2340 A Gateway may use more than one pseudonymous 2341 identifier. 2342 A complete anonymisation would be beneficial in terms of 2343 the privacy of the consumer. However, a complete 2344 anonymous set of information would not allow the external 2345 entity to ensure that the data comes from a trustworthy 2346 source. 2347 Please note that an information flow shall only be initiated 2348 if allowed by a corresponding Processing Profile. 2349 2350 6.9Class FPT: Protection of the TSF 2351 6.9.1 Fail secure (FPT_FLS) 2352 6.9.1.1 FPT_FLS.1: Failure with preservation of secure state 2353 FPT_FLS.1.1 The TSF shall preserve a secure state when the following 2354 types of failures occur: 2355 • the deviation between local system time of the TOE 2356 and the reliable external time source is too large, 2357 • TOE hardware / firmware integrity violation or 2358 • TOE software application integrity violation 208. 2359 Hierarchical to: No other components. 2360 Dependencies: No dependencies. 2361 Application Note 36: The local clock shall be as exact as required by normative 2362 or legislative regulations. If no regulation exists, a 2363 208 [assignment: list of types of failures in the TSF] page 119 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland maximum deviation of 3% of the measuring period is 2364 allowed to be in conformance with [PP_GW]. 2365 6.9.2 Replay Detection (FPT_RPL) 2366 6.9.2.1 FPT_RPL.1: Replay detection 2367 FPT_RPL.1.1 The TSF shall detect replay for the following entities: all 2368 external entities 209. 2369 FPT_RPL.1.2 The TSF shall perform ignore replayed data 210 when 2370 replay is detected. 2371 Hierarchical to: No other components. 2372 Dependencies: No dependencies. 2373 6.9.3 Time stamps (FPT_STM) 2374 6.9.3.1 FPT_STM.1: Reliable time stamps 2375 FPT_STM.1.1 The TSF shall be able to provide reliable time stamps. 2376 Hierarchical to: No other components. 2377 Dependencies: No dependencies. 2378 2379 6.9.4 TSF self test (FPT_TST) 2380 6.9.4.1 FPT_TST.1: TSF testing 2381 FPT_TST.1.1 The TSF shall run a suite of self tests during initial startup, 2382 at the request of a user and periodically during normal 2383 operation 211 to demonstrate the correct operation of the 2384 TSF 212. 2385 209 [assignment: list of identified entities] 210 [assignment: list of specific actions] 211 [selection: during initial start-up, periodically during normal operation, at the request of the authorised user, at the conditions[assignment: conditions under which self test should occur]] 212 [selection: [assignment: parts of TSF], the TSF] page 120 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FPT_TST.1.2 The TSF shall provide authorised users with the capability 2386 to verify the integrity of TSF data 213. 2387 FPT_TST.1.3 The TSF shall provide authorised users with the capability 2388 to verify the integrity of TSF 214. 2389 Hierarchical to: No other components. 2390 Dependencies: No dependencies. 2391 6.9.5 TSF physical protection (FPT_PHP) 2392 6.9.5.1 FPT_PHP.1: Passive detection of physical attack 2393 FPT_PHP.1.1 The TSF shall provide unambiguous detection of physical 2394 tampering that might compromise the TSF. 2395 FPT_PHP.1.2 The TSF shall provide the capability to determine whether 2396 physical tampering with the TSF's devices or TSF 2397 elements has occurred. 2398 Hierarchical to: No other components. 2399 Dependencies: No dependencies. 2400 2401 6.10 Class FTP: Trusted path/channels 2402 6.10.1 Inter-TSF trusted channel (FTP_ITC) 2403 6.10.1.1 FTP_ITC.1/WAN: Inter-TSF trusted channel for WAN 2404 FTP_ITC.1.1/WAN The TSF shall provide a communication channel between 2405 itself and another trusted IT product that is logically distinct 2406 from other communication channels and provides assured 2407 identification of its end points and protection of the channel 2408 data from modification or disclosure. 2409 213 [selection: [assignment: parts of TSF data], TSF data] 214 [selection: [assignment: parts of TSF], TSF] page 121 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FTP_ITC.1.2/WAN The TSF shall permit the TSF 215 to initiate communication 2410 via the trusted channel. 2411 FTP_ITC.1.3/WAN The TSF shall initiate communication via the trusted 2412 channel for all communications to external entities in the 2413 WAN 216. 2414 Hierarchical to: No other components 2415 Dependencies: No dependencies. 2416 6.10.1.2 FTP_ITC.1/MTR: Inter-TSF trusted channel for Meter 2417 FTP_ITC.1.1/MTR The TSF shall provide a communication channel between 2418 itself and another trusted IT product that is logically distinct 2419 from other communication channels and provides assured 2420 identification of its end points and protection of the channel 2421 data from modification or disclosure. 2422 FTP_ITC.1.2/MTR The TSF shall permit the Meter and the TOE 217 to initiate 2423 communication via the trusted channel. 2424 FTP_ITC.1.3/MTR The TSF shall initiate communication via the trusted 2425 channel for any communication between a Meter and the 2426 TOE 218. 2427 Hierarchical to: No other components. 2428 Dependencies: No dependencies. 2429 Application Note 37: The corresponding cryptographic primitives are defined by 2430 FCS_COP.1/MTR. 2431 6.10.1.3 FTP_ITC.1/USR: Inter-TSF trusted channel for User 2432 FTP_ITC.1.1/USR The TSF shall provide a communication channel between 2433 itself and another trusted IT product that is logically distinct 2434 from other communication channels and provides assured 2435 215 [selection: the TSF, another trusted IT product] 216 [assignment: list of functions for which a trusted channel is required] 217 [selection: the TSF, another trusted IT product] 218 [assignment: list of functions for which a trusted channel is required] page 122 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland identification of its end points and protection of the channel 2436 data from modification or disclosure. 2437 FTP_ITC.1.2/USR The TSF shall permit the Consumer, the Service 2438 Technician 219 to initiate communication via the trusted 2439 channel. 2440 FTP_ITC.1.3/USR The TSF shall initiate communication via the trusted 2441 channel for any communication between a Consumer and 2442 the TOE and the Service Technician and the TOE 220. 2443 Hierarchical to: No other components. 2444 Dependencies: No dependencies. 2445 2446 6.11 Security Assurance Requirements for the TOE 2447 The minimum Evaluation Assurance Level for this Security Target is EAL 4 augmented 2448 by AVA_VAN.5 and ALC_FLR.2. The following table lists the assurance components 2449 which are therefore applicable to this ST. 2450 Assurance Class Assurance Component Development ADV_ARC.1 ADV_FSP.4 ADV_IMP.1 ADV_TDS.3 Guidance documents AGD_OPE.1 AGD_PRE.1 Life-cycle support ALC_CMC.4 219 [selection: the TSF, another trusted IT product] 220 [assignment: list of functions for which a trusted channel is required] page 123 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Assurance Class Assurance Component ALC_CMS.4 ALC_DEL.1 ALC_DVS.1 ALC_LCD.1 ALC_TAT.1 ALC_FLR.2 Security Target Evaluation ASE_CCL.1 ASE_ECD.1 ASE_INT.1 ASE_OBJ.2 ASE_REQ.2 ASE_SPD.1 ASE_TSS.1 Tests ATE_COV.2 ATE_DPT.1 ATE_FUN.1 ATE_IND.2 Vulnerability Assessment AVA_VAN.5 Table 16: Assurance Requirements 2451 page 124 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.12 Security Requirements rationale 2452 6.12.1 Security Functional Requirements rationale 2453 6.12.1.1 Fulfilment of the Security Objectives 2454 This chapter proves that the set of security requirements (TOE) is suited to fulfil the 2455 security objectives described in chapter 4 and that each SFR can be traced back to the 2456 security objectives. At least one security objective exists for each security requirement. 2457 O.Firewall O.SeparateIF O.Conceal O.Meter O.Crypt O.Time O.Protect O.Manage- ment O.Log O.Access FAU_ARP.1/SYS X FAU_GEN.1/SYS X FAU_SAA.1/SYS X FAU_SAR.1/SYS X FAU_STG.4/SYS X FAU_GEN.1/CON X FAU_SAR.1/CON X FAU_STG.4/CON X FAU_GEN.1/CAL X FAU_SAR.1/CAL X FAU_STG.4/CAL X FAU_GEN.2 X FAU_STG.2 X FCO_NRO.2 X page 125 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland O.Firewall O.SeparateIF O.Conceal O.Meter O.Crypt O.Time O.Protect O.Manage- ment O.Log O.Access FCS_CKM.1/TLS X FCS_COP.1/TLS X FCS_CKM.1/CMS X FCS_COP.1/CMS X FCS_CKM.1/MTR X FCS_COP.1/MTR X FCS_CKM.4 X FCS_COP.1/HASH X FCS_COP.1/MEM X X FDP_ACC.2 X FDP_ACF.1 X FDP_IFC.2/FW X X FDP_IFF.1/FW X X FDP_IFC.2/MTR X X FDP_IFF.1/MTR X X FDP_RIP.2 X FDP_SDI.2 X FIA_ATD.1 X page 126 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland O.Firewall O.SeparateIF O.Conceal O.Meter O.Crypt O.Time O.Protect O.Manage- ment O.Log O.Access FIA_AFL.1 X FIA_UAU.2 X FIA_UAU.5 X FIA_UAU.6 X FIA_UID.2 X FIA_USB.1 X FMT_MOF.1 X FMT_SMF.1 X FMT_SMR.1 X FMT_MSA.1/AC X FMT_MSA.3/AC X FMT_MSA.1/FW X FMT_MSA.3/FW X FMT_MSA.1/MTR X FMT_MSA.3/MTR X FPR_CON.1 X FPR_PSE.1 X FPT_FLS.1 X page 127 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland O.Firewall O.SeparateIF O.Conceal O.Meter O.Crypt O.Time O.Protect O.Manage- ment O.Log O.Access FPT_RPL.1 X FPT_STM.1 X X FPT_TST.1 X X FPT_PHP.1 X FTP_ITC.1/WAN X FTP_ITC.1/MTR X FTP_ITC.1/USR X Table 17: Fulfilment of Security Objectives 2458 The following paragraphs contain more details on this mapping. 2459 6.12.1.1.1 O.Firewall 2460 O.Firewall is met by a combination of the following SFRs: 2461 • FDP_IFC.2/FW defines that the TOE shall implement an information flow policy 2462 for its firewall functionality. 2463 • FDP_IFF.1/FW defines the concrete rules for the firewall information flow policy. 2464 • FTP_ITC.1/WAN defines the policy around the trusted channel to parties in the 2465 WAN. 2466 6.12.1.1.2 O.SeparateIF 2467 O.SeparateIF is met by a combination of the following SFRs: 2468 • FDP_IFC.2/FW and FDP_IFF.1/FW implicitly require the TOE to implement 2469 physically separate ports for WAN and LMN. 2470 • FPT_TST.1 implements a self test that also detects whether the ports for WAN 2471 and LAN have been interchanged. 2472 page 128 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.12.1.1.3 O.Conceal 2473 O.Conceal is completely met by FPR_CON.1 as directly follows. 2474 6.12.1.1.4 O.Meter 2475 O.Meter is met by a combination of the following SFRs: 2476 • FDP_IFC.2/MTR and FDP_IFF.1/MTR define an information flow policy to 2477 introduce how the Gateway shall handle Meter Data. 2478 • FCO_NRO.2 ensure that all Meter Data will be signed by the Gateway (invoking 2479 the services of its Security Module) before being submitted to external entities. 2480 • FPR_PSE.1 defines requirements around the pseudonymization of Meter 2481 identities for Status data. 2482 • FTP_ITC.1/MTR defines the requirements around the Trusted Channel that 2483 shall be implemented by the Gateway in order to protect information submitted 2484 via the Gateway and external entities in the WAN or the Gateway and a 2485 distributed Meter. 2486 2487 page 129 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.12.1.1.5 O.Crypt 2488 O.Crypt is met by a combination of the following SFRs: 2489 • FCS_CKM.4 defines the requirements around the secure deletion of ephemeral 2490 cryptographic keys. 2491 • FCS_CKM.1/TLS defines the requirements on key negotiation for the TLS 2492 protocol. 2493 • FCS_CKM.1/CMS defines the requirements on key generation for symmetric 2494 encryption within CMS. 2495 • FCS_COP.1/TLS defines the requirements around the encryption and 2496 decryption capabilities of the Gateway for communications with external parties 2497 and to Meters. 2498 • FCS_COP.1/CMS defines the requirements around the encryption and 2499 decryption of content and administration data. 2500 • FCS_CKM.1/MTR defines the requirements on key negotiation for meter com- 2501 munication encryption. 2502 • FCS_COP.1/MTR defines the cryptographic primitives for meter 2503 communication encryption. 2504 • FCS_COP.1/HASH defines the requirements on hashing that are needed in the 2505 context of digital signatures (which are created and verified by the Security 2506 Module). 2507 • FCS_COP.1/MEM defines the requirements around the encryption of TSF data. 2508 • FPT_RPL.1 ensures that a replay attack for communications with external 2509 entities is detected. 2510 6.12.1.1.6 O.Time 2511 O.Time is met by a combination of the following SFRs: 2512 • FDP_IFC.2/MTR and FDP_IFF.1/MTR define the required update functionality 2513 for the local time as part of the information flow control policy for handling Meter 2514 Data. 2515 • FPT_STM.1 defines that the TOE shall be able to provide reliable time stamps. 2516 2517 page 130 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 6.12.1.1.7 O.Protect 2518 O.Protect is met by a combination of the following SFRs: 2519 • FCS_COP.1/MEM defines that the TOE shall encrypt its TSF and user data as 2520 long as it is not in use. 2521 • FDP_RIP.2 defines that the TOE shall make information unavailable as soon 2522 as it is no longer needed. 2523 • FDP_SDI.2 defines requirements around the integrity protection for stored data. 2524 • FPT_FLS.1 defines requirements that the TOE falls back to a safe state for 2525 specific error cases. 2526 • FPT_TST.1 defines the self testing functionality to detect whether the interfaces 2527 for WAN and LAN are separate. 2528 • FPT_PHP.1 defines the exact requirements around the physical protection that 2529 the TOE has to provide. 2530 6.12.1.1.8 O.Management 2531 O.Management is met by a combination of the following SFRs: 2532 • FIA_ATD.1 defines the attributes for users. 2533 • FIA_AFL.1 defines the requirements if the authentication of users fails multiple 2534 times. 2535 • FIA_UAU.2 defines requirements around the authentication of users. 2536 • FIA_UID.2 defines requirements around the identification of users. 2537 • FIA_USB.1 defines that the TOE must be able to associate users with subjects 2538 acting on behalf of them. 2539 • FMT_MOF.1 defines requirements around the limitations for management of 2540 security functions. 2541 • FMT_MSA.1/AC defines requirements around the limitations for management 2542 of attributes used for the Gateway access SFP. 2543 • FMT_MSA.1/FW defines requirements around the limitations for management 2544 of attributes used for the Firewall SFP. 2545 • FMT_MSA.1/MTR defines requirements around the limitations for management 2546 of attributes used for the Meter SFP. 2547 • FMT_MSA.3/AC defines the default values for the Gateway access SFP. 2548 • FMT_MSA.3/FW defines the default values for the Firewall SFP. 2549 • FMT_MSA.3/MTR defines the default values for the Meter SFP. 2550 page 131 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland • FMT_SMF.1 defines the management functionalities that the TOE must offer. 2551 • FMT_SMR.1 defines the role concept for the TOE. 2552 6.12.1.1.9 O.Log 2553 O.Log defines that the TOE shall implement three different audit processes that are 2554 covered by the Security Functional Requirements as follows: 2555 System Log 2556 The implementation of the system log itself is covered by the use of FAU_GEN.1/SYS. 2557 FAU_ARP.1/SYS and FAU_SAA.1/SYS allow to define a set of criteria for automated 2558 analysis of the audit and a corresponding response. FAU_SAR.1/SYS defines the 2559 requirements around the audit review functions and that access to them shall be limited 2560 to authorised Gateway Administrators via the IF_GW_WAN interface and to authorised 2561 Service Technicians via the IF_GW_SRV interface. Finally, FAU_STG.4/SYS defines 2562 the requirements on what should happen if the audit log is full. 2563 Consumer Log 2564 The implementation of the consumer log itself is covered by the use of 2565 FAU_GEN.1/CON. FAU_STG.4/CON defines the requirements on what should happen 2566 if the audit log is full. FAU_SAR.1/CON defines the requirements around the audit review 2567 functions for the consumer log and that access to them shall be limited to authorised 2568 Consumer via the IF_GW_CON interface. FTP_ITC.1/USR defines the requirements on 2569 the protection of the communication of the Consumer with the TOE. 2570 Calibration Log 2571 The implementation of the calibration log itself is covered by the use of 2572 FAU_GEN.1/CAL. FAU_STG.4/CAL defines the requirements on what should happen 2573 if the audit log is full. FAU_SAR.1/CAL defines the requirements around the audit review 2574 functions for the calibration log and that access to them shall be limited to authorised 2575 Gateway Administrators via the IF_GW_WAN interface. 2576 FAU_GEN.2, FAU_STG.2 and FPT_STM.1 apply to all three audit processes. 2577 6.12.1.1.10 O.Access 2578 FDP_ACC.2 and FDP_ACF.1 define the access control policy as required to address 2579 O.Access. FIA_UAU.5 ensures that entities that would like to communicate with the TOE 2580 are authenticated before any action whereby FIA_UAU.6 ensures that external entities 2581 page 132 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland in the WAN are re-authenticated after the session key has been used for a certain 2582 amount of time. 2583 6.12.1.2 Fulfilment of the dependencies 2584 The following table summarises all TOE functional requirements dependencies of this 2585 ST and demonstrates that they are fulfilled. 2586 SFR Dependencies Fulfilled by FAU_ARP.1/SYS FAU_SAA.1 Potential violation analysis FAU_SAA.1/SYS FAU_GEN.1/SYS FPT_STM.1 Reliable time stamps FPT_STM.1 FAU_SAA.1/SYS FAU_GEN.1 Audit data generation FAU_GEN.1/SYS FAU_SAR.1/SYS FAU_GEN.1 Audit data generation FAU_GEN.1/SYS FAU_STG.4/SYS FAU_STG.1 Protected audit trail storage FAU_STG.2 FAU_GEN.1/CON FPT_STM.1 Reliable time stamps FPT_STM.1 FAU_SAR.1/CON FAU_GEN.1 Audit data generation FAU_GEN.1/CON FAU_STG.4/CON FAU_STG.1 Protected audit trail storage FAU_STG.2 FAU_GEN.1/CAL FPT_STM.1 Reliable time stamps FPT_STM.1 FAU_SAR.1/CAL FAU_GEN.1 Audit data generation FAU_GEN.1/CAL FAU_STG.4/CAL FAU_STG.1 Protected audit trail storage FAU_STG.2 FAU_GEN.2 FAU_GEN.1 Audit data generation FIA_UID.1 Timing of identification FAU_GEN.1/SYS FAU_GEN.1/CON FIA_UID.2 FAU_STG.2 FAU_GEN.1 Audit data generation FAU_GEN.1/SYS FAU_GEN.1/CON FAU_GEN.1/CAL page 133 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FCO_NRO.2 FIA_UID.1 Timing of identification FIA_UID.2 FCS_CKM.1/TLS [FCS_CKM.2 Cryptographic key distribution, or FCS_COP.1 Cryptographic operation] FCS_CKM.4 Cryptographic key destruction FCS_COP.1/TLS FCS_CKM.4 FCS_COP.1/TLS [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction FCS_CKM.1/TLS FCS_CKM.4 FCS_CKM.1/CMS [FCS_CKM.2 Cryptographic key distribution, or FCS_COP.1 Cryptographic operation] FCS_CKM.4 Cryptographic key destruction FCS_COP.1/CMS FCS_CKM.4 FCS_COP.1/CMS [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction FCS_CKM.1/CMS FCS_CKM.4 FCS_CKM.1/MTR [FCS_CKM.2 Cryptographic key distribution, or FCS_COP.1 Cryptographic operation] FCS_CKM.4 Cryptographic key destruction FCS_COP.1/MTR FCS_CKM.4 FCS_COP.1/MTR [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1/TLS FCS_CKM.4 page 134 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 221 The key will be generated by secure production environment and not the TOE itself. FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction FCS_CKM.4 [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.1/TLS FCS_CKM.1/CMS FCS_CKM.1/MTR FCS_COP.1/HASH [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction Please refer to chapter 6.12.1.3 for missing dependency FCS_CKM.4 FCS_COP.1/MEM [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction not fulfilled 221 FCS_CKM.4 FDP_ACC.2 FDP_ACF.1 Security attribute based access control FDP_ACF.1 FDP_ACF.1 FDP_ACC.1 Subset access control FMT_MSA.3 Static attribute initialisation FDP_ACC.2 FMT_MSA.3/AC FDP_IFC.2/FW FDP_IFF.1 Simple security attributes FDP_IFF.1/FW page 135 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FDP_IFF.1/FW FDP_IFC.1 Subset information flow control FMT_MSA.3 Static attribute initialisation FDP_IFC.2/FW FMT_MSA.3/FW FDP_IFC.2/MTR FDP_IFF.1 Simple security attributes FDP_IFF.1/MTR FDP_IFF.1/MTR FDP_IFC.1 Subset information flow control FMT_MSA.3 Static attribute initialisation FDP_IFC.2/MTR FMT_MSA.3/MTR FDP_RIP.2 - - FDP_SDI.2 - - FIA_ATD.1 - - FIA_AFL.1 FIA_UAU.1 Timing of authentication FIA_UAU.2 FIA_UAU.2 FIA_UID.1 Timing of identification FIA_UID.2 FIA_UAU.5 - - FIA_UAU.6 - - FIA_UID.2 - - FIA_USB.1 FIA_ATD.1 User attribute definition FIA_ATD.1 FMT_MOF.1 FMT_SMR.1 Security roles FMT_SMF.1 Specification of Management Functions FMT_SMR.1 FMT_SMF.1 FMT_SMF.1 - - FMT_SMR.1 FIA_UID.1 Timing of identification FIA_UID.2 FMT_MSA.1/AC [FDP_ACC.1 Subset access control, or FDP_IFC.1 Subset information flow control] FMT_SMR.1 Security roles FDP_ACC.2 FMT_SMR.1 FMT_SMF.1 page 136 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FMT_SMF.1 Specification of Management Functions FMT_MSA.3/AC FMT_MSA.1 Management of security attributes FMT_SMR.1 Security roles FMT_MSA.1/AC FMT_SMR.1 FMT_MSA.1/FW [FDP_ACC.1 Subset access control, or FDP_IFC.1 Subset information flow control] FMT_SMR.1 Security roles FMT_SMF.1 Specification of Management Functions FDP_IFC.2/WAN FMT_SMR.1 FMT_SMF.1 FMT_MSA.3/FW FMT_MSA.1 Management of security attributes FMT_SMR.1 Security roles FMT_MSA.1/FW FMT_SMR.1 FMT_MSA.1/MTR [FDP_ACC.1 Subset access control, or FDP_IFC.1 Subset information flow control] FMT_SMR.1 Security roles FMT_SMF.1 Specification of Management Functions FDP_IFC.2/MTR FMT_SMR.1 FMT_SMF.1 FMT_MSA.3/MTR FMT_MSA.1 Management of security attributes FMT_SMR.1 Security roles FMT_MSA.1/MTR FMT_SMR.1 FPR_CON.1 - - FPR_PSE.1 - - FPT_FLS.1 - - FPT_RPL.1 - - FPT_STM.1 - - FPT_TST.1 - - page 137 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Table 18: SFR Dependencies 2587 6.12.1.3 Justification for missing dependencies 2588 Dependency FCS_CKM.1 for FCS_COP.1/MEM ist not fulfilled. For the key generation 2589 process an external security module (“D-HSM”) is used so that the key is imported from 2590 an HSM during TOE production. 2591 The hash algorithm as defined in FCS_COP.1/HASH does not need any key material. 2592 As such the dependency to an import or generation of key material is omitted for this 2593 SFR. 2594 6.12.2 Security Assurance Requirements rationale 2595 The decision on the assurance level has been mainly driven by the assumed attack 2596 potential. As outlined in the previous chapters of this Security Target it is assumed that 2597 – at least from the WAN side – a high attack potential is posed against the security 2598 functions of the TOE. This leads to the use of AVA_VAN.5 (Resistance against high 2599 attack potential). 2600 In order to keep evaluations according to this Security Target commercially feasible EAL 2601 4 has been chosen as assurance level as this is the lowest level that provides the 2602 prerequisites for the use of AVA_VAN.5. 2603 Eventually, the augmentation by ALC_FLR.2 has been chosen to emphasize the 2604 importance of a structured process for flaw remediation at the developer’s side, 2605 specifically for such a new technology. 2606 6.12.2.1 Dependencies of assurance components 2607 The dependencies of the assurance requirements taken from EAL 4 are fulfilled 2608 automatically. The augmentation by AVA_VAN.5 and ALC_FLR.2 does not introduce 2609 additional assurance components that are not contained in EAL 4. 2610 FPT_PHP.1 - - FTP_ITC.1/WAN - - FTP_ITC.1/MTR - - FTP_ITC.1/USR - - page 138 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 7 TOE Summary Specification 2611 The following paragraph provides a TOE summary specification describing how the TOE 2612 meets each SFR. 2613 2614 7.1SF.1: Authentication of Communication and Role Assignment 2615 for external entities 2616 The TOE contains a software module that authenticates all communication channels 2617 with WAN, HAN and LMN networks. The authentication is based on the TLS 1.2 protocol 2618 compliant to [RFC 5246]. According to [TR-03109], this TLS authentication mechanism 2619 is used for all TLS secured communications channels with external entities. The TOE 2620 does always implement the bidirectional authentication as required by [TR-03109-1] with 2621 one exception: if the Consumer requests a password-based authentication from the 2622 GWA according to [TR-03109-1], and the GWA activates this authentication method for 2623 this Consumer, the TOE uses a unidirectional TLS authentication. Thus, although the 2624 client has not sent a valid certificate, the TOE continues the TLS authentication process 2625 with the password authentication process for this client (see [RFC 5246, chap. 7.4.6.]). 2626 The password policy to be fulfilled hereby is that the password must be at least 10 char- 2627 acters long containing at least one character of each of the following character groups: 2628 capital letters, small letters, digits, and special characters (!"§$%&/()=?+*~#',;.:-_). Fur- 2629 ther characters could also be used. 2630 [TR-03109-1] requires the TOE to use elliptical curves conforming to [RFC 5289] 2631 whereas the following cipher suites are supported: 2632 • TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, 2633 • TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384, 2634 • TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, and 2635 • TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384. 2636 The following elliptical curves are supported by the TOE 2637 • BrainpoolP256r1 (according to [RFC 5639]), 2638 • BrainpoolP384r1 (according to [RFC 5639]), 2639 • BrainpoolP512r1 (according to [RFC 5639]), 2640 • NIST P-256 (according to [RFC 5114]), and 2641 • NIST P-384 (according to [RFC 5114]). 2642 page 139 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Alongside, the TOE supports the case of unidirectional communication with wireless me- 2643 ter (via the wM-Bus protocol), where the external entity is authenticated via AES with 2644 CMAC authentication. In this case, the AES algorithm is operating in CBC mode with 2645 128-bit symmetric keys. The authentication is successful in case that the CMAC has 2646 been successfully verified by the use of a cryptographic key Kmac. The cryptographic key 2647 for CMAC authentication (Kmac) is derived from the meter individual key MK conformant 2648 to [TR-03116-3, chap. 7.2]. The meter individual key MK (brought into the TOE by the 2649 GWA) is selected by the TOE through the MAC-protected but unencrypted meter-id sub- 2650 mitted by the meter. 2651 The generation of the cryptographic key material for TLS secured communication chan- 2652 nels utilizes a Security Module. This Security Module is compliant to [TR-03109-2] and 2653 evaluated according to [SecModPP]. 2654 The destruction of cryptographic key material used by the TOE is performed through 2655 “zeroisation”. The TOE stores all ephemeral keys used for TLS secured communication 2656 or other cryptographic operations in the RAM only. For instance, whenever a TLS se- 2657 cured communication is terminated, the TOE wipes the RAM area used for the crypto- 2658 graphic key material with 0-bytes directly after finishing the usage of that material. 2659 The TOE receives the authentication certificate of the external entity during the hand- 2660 shake phase of the TLS protocol. For the establishment of the TLS secured communi- 2661 cation channel, the TOE verifies the correctness of the signed data transmitted during 2662 the TLS protocol handshake phase. While importing an authentication certificate the 2663 TOE verifies the certificate chain of the certificate for all certificates of the SM-PKI ac- 2664 cording to [TR-03109-4]. Note, that the certificate used for the TLS-based authentication 2665 of wired meters is self-signed and not part of the SM-PKI. Additionally, the TOE checks 2666 whether the certificate is configured by the Gateway Administrator for the used interface, 2667 and whether the remote IP address used and configured in the TSF data are identical 2668 (FIA_USB.1). The TOE does not check the certificate’s revocation status. In order to 2669 authenticate the external entity, the key material of the TOE’s communication partner 2670 must be known and trusted. 2671 The following communication types are known to the TOE 222: 2672 a) WAN communication via IF_GW_WAN 2673 222 Please note that the TOE additionally offers the interface IF_GW_SM to the certified Security Module built into the TOE. page 140 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland b) LMN communication via IF_GW_MTR (wireless or wired Meter) 2674 c) HAN communication via IF_GW_CON, IF_GW_CLS or IF_GW_SRV 2675 Except the communication with wireless meters at IF_GW_MTR, all communication 2676 types are TLS-based. In order to accept a TLS communication connection as being au- 2677 thenticated, the following conditions must be fulfilled: 2678 a) The TLS channel must have been established successfully with the required 2679 cryptographic mechanisms. 2680 b) The certificate of the external entity must be known and trusted through config- 2681 uration by the Gateway Administrator, and associated with the according com- 2682 munication type223. 2683 For the successfully authenticated external entity, the TOE performs an internal assign- 2684 ment of the communication type based on the certificate received at the external inter- 2685 face if applicable. The user identity is associated with the name of the certificate owner 2686 in case of a certificate-based authentication or with the user name in case of a password- 2687 based authentication at interface IF_GW_CON. 2688 For the LMN communication of the TOE with wireless (a.k.a. wM-Bus-based) meters, 2689 the external entity is authenticated by the use of the AES-CMAC algorithm and the me- 2690 ter-ID for wired Meters is used for association to the user identity (FIA_USB.1). This 2691 communication is only allowed for meters not supporting TLS-based communication 2692 scenarios. 2693 FCS_CKM.1/TLS is fulfilled by the TOE through the implementation of the pseudoran- 2694 dom function of the TLS protocol compliant to [RFC 5246] while the Security Module is 2695 used by the TOE for the generation of the cryptographic key material. The use of TLS 2696 according to [RFC 5246] and the use of the postulated cipher suites according to 2697 [RFC 5639] fulfill the requirement FCS_COP.1/TLS. The requirements 2698 FCS_CKM.1/MTR and FCS_COP.1/MTR are fulfilled by the use of AES-CMAC-secured 2699 communication for wireless meters. The requirement FCS_CKM.4 is fulfilled by the de- 2700 scribed method of “zeroisation” when destroying cryptographic key material. The imple- 2701 mentation of the described mechanisms (especially the use of TLS and AES-CBC with 2702 CMAC) fulfills the requirements FTP_ITC.1/WAN, FTP_ITC.1/MTR, and 2703 223 Of course, this does not apply if password-based authentication is configured at IF_GW_CON. page 141 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland FTP_ITC.1/USR. FPT_RPL.1 is fulfilled by the use of the TLS protocol respectively the 2704 integration of transmission counters according to [TR-03116-3, chap. 7.3]. 2705 A successfully established connection will be automatically disconnected by the TOE if 2706 a TLS channel to the WAN is established more than 48 hours, if a TLS channel to the 2707 LMN has transmitted more than 5 MB of information or if a channel to a local user is 2708 inactive for a time configurable by the authorised Gateway Administrator of up to 10 2709 minutes, and a new connection establishment will require a new full authentication pro- 2710 cedure (FIA_UAU.6). In any case – whether the connection has been successfully es- 2711 tablished or not – all associated resources related with the connection or connection 2712 attempt are freed. The implementation of this requirement is done by means of the TOE’s 2713 operation system monitoring and limiting the resources of each process. This means 2714 that with each connection (or connection attempt) an internal session is created that is 2715 associated with resources monitored and limited by the TOE. All resources are freed 2716 even before finishing a session if the respective resource is no longer needed so that no 2717 previous information content of a resource is made available. Especially, the associated 2718 cryptographic key material is wiped as soon it is no longer needed. As such, the TOE 2719 ensures that during the phase of connection termination the internal session is also ter- 2720 minated and by this, all internal data (associated cryptographic key material and volatile 2721 data) is wiped by the zeroisation procedure described. Allocated physical resources are 2722 also freed. In case non-volatile data is no longer needed, the associated resources data 2723 are freed, too. The TOE doesn’t reuse any objects after deallocation of the resource 2724 (FDP_RIP.2). 2725 If the external entity can be successfully authenticated on basis of the received certificate 2726 (or the password in case of a consumer using password authentication) and the ac- 2727 claimed identity could be approved for the used external interface, the TOE associates 2728 the user identity, the authentication status and the connecting network to the role ac- 2729 cording to the internal role model (FIA_ATD.1). In order to implement this, the TOE uti- 2730 lizes an internal data model which supplies the allowed communication network and 2731 other restricting properties linked with the submitted security attribute on the basis of the 2732 submitted authentication data providing the multiple mechanisms for authentication of 2733 any user's claimed identity according to the necessary rules according to [TR-03109-1] 2734 (FIA_UAU.5). 2735 In case of wireless meter communication (via the wM-Bus protocol), the security attribute 2736 of the Meter is the meter-id authenticated by the CMAC, where the meter-id is the identity 2737 providing criterion that is used by the TOE. The identity of the Meter is associated to the 2738 page 142 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland successfully authenticated external entity by the TOE and linked to the respective role 2739 according to Table 5 and its active session. In this case, the identity providing criterion 2740 is also the meter-id. 2741 The TOE enforces an explicit and complete security policy protecting the data flow for 2742 all external entities (FDP_IFC.2/FW, FDP_IFF.1/FW, FDP_IFC.2/MTR, 2743 FDP_IFF.1/MTR). The security policy defines the accessibility of data for each external 2744 entity and additionally the permitted actions for these data. Moreover, the external enti- 2745 ties do also underlie restrictions for the operations which can be executed with the TOE 2746 (FDP_ACF.1). In case that it is not possible to authenticate an external entity success- 2747 fully (e.g. caused by unknown authentication credentials), no other action is allowed on 2748 behalf of this user and the concerning connection is terminated (FIA_UAU.2). Any com- 2749 munication is only possible after successful authentication and identification of the ex- 2750 ternal entity (FIA_UID.2, FIA_USB.1). 2751 The reception of the wake-up service data package is a special case that requests the 2752 TOE to establish a TLS authenticated and protected connection to the Gateway Admin- 2753 istrator. The TOE validates the data package due to its compliance to the structure de- 2754 scribed in [TR-03109-1] and verifies the ECDSA signature with the public key of the 2755 Gateway Administrator’s certificate which must be known and trusted to the TOE. The 2756 TOE does n ot perform a revocation check or any validity check compliant to the shell 2757 model. The TOE verifies the electronic signature successfully when the certificate is 2758 known, trusted and associated to the Gateway Administrator. The TOE establishes the 2759 connection to the Gateway Administrator when the package has been validated due to 2760 its structural conformity, the signature has been verified and the integrated timestamp 2761 fulfills the requirements of [TR-03109-1]. Receiving the data package and the successful 2762 validation of the wake-up package does not mean that the Gateway Administrator has 2763 successfully been authenticated. 2764 If the Gateway Administrator could be successfully authenticated based on the certificate 2765 submitted during the TLS handshake phase, the role will be assigned by the TOE ac- 2766 cording to now approved identity based on the internal role model and the TLS channel 2767 will be established. 2768 WAN roles 2769 The TOE assigns the following roles in the WAN communication (FMT_SMR.1): 2770 • authorised Gateway Administrator, 2771 • authorised External Entity. 2772 page 143 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland The role assignment is based on the X.509 certificate used by the external entity during 2773 TLS connection establishment. The TOE has explicit knowledge of the Gateway Admin- 2774 istrator’s certificate and the assignment of the role “Gateway Administrator” requires the 2775 successful authentication of the WAN connection. 2776 The assignment of the role “Authorized External Entity” requires the X.509 certificate 2777 that is used during the TLS handshake to be part of an internal trust list that is under 2778 control of the TOE. 2779 The role “Authorized External Entity” can be assigned to more than one external entity. 2780 HAN roles 2781 The TOE differentiates and assigns the following roles in the HAN communication 2782 (FMT_SMR.1): 2783 • authorised Consumer 2784 • authorised Service Technician 2785 The role assignment is based on the X.509 certificate used by the external entity for 2786 TLS-secured communication channels or on password-based authentication at interface 2787 IF_GW_CON if configured (FIA_USB.1). 2788 The assignment of roles in the HAN communication requires the successful identification 2789 of the external entity as a result of a successful authentication based on the certificate 2790 used for the HAN connection. The certificates used to authenticate the “Consumer” or 2791 the “Service Technician” are explicitly known to the TOE through configuration by the 2792 Gateway Administrator. 2793 Multi-client capability in the HAN 2794 The HAN communication might use more than one, parallel and independent authenti- 2795 cated communication channels. The TOE ensures that the certificates that are used for 2796 the authentication are different from each other. 2797 The role “Consumer” can be assigned to multiple, parallel sessions. The TOE ensures 2798 that these parallel sessions are logically distinct from each other by the use of different 2799 authentication information. This ensures that only the Meter Data associated with the 2800 authorized user are provided and Meter Data of other users are not accessible. 2801 LMN roles 2802 One of the following authentication mechanisms is used for Meters: 2803 page 144 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland a) authentication by the use of TLS according to [RFC 5246] for wired Meters 2804 a) authentication by the use of AES with CMAC authentication according to 2805 [RFC 3394] for wireless Meters. 2806 The TOE explicitly knows the identification credentials needed for authentication (X.509 2807 certificate when using TLS; meter-id in conjunction with CMAC and known Kmac when 2808 using AES) through configuration by the Gateway Administrator. If the Meter could be 2809 successfully authenticated and the claimed identity could thus be proved, the according 2810 role “Authorised External Entity” is assigned by the TOE for this Meter at IF_GW_MTR 2811 based on the internal role model. 2812 LMN multi-client capabilities 2813 The LMN communication can be run via parallel, logically distinct and separately au- 2814 thenticated communication channels. The TOE ensures that the authentication creden- 2815 tials of each separate channel are different. 2816 The TOE’s internal policy for access to data and objects under control of the TOE is 2817 closely linked with the identity of the external entity at IF_GW_MTR according to the 2818 TOE-internal role model. Based on the successfully verified authentication data, a per- 2819 mission catalogue with security attributes is internally assigned, which defines the al- 2820 lowed actions and access permissions within a communication channel. 2821 The encapsulation of the TOE processes run by this user is realized through the mech- 2822 anisms offered by the TOE´s operating system and very restrictive user rights for each 2823 process. Each role is assigned to a separate, limited user account in the TOE´s operating 2824 system. For all of these accounts, it is only allowed to read, write or execute the files 2825 absolutely necessary for implementing the program logic. For each identity interacting 2826 with the TOE, a separate operating system process is started. Especially, the databases 2827 used by the TOE and the logging service are adequately separated for enforcement of 2828 the necessary security domain separation (FDP_ACF.1). The allowed actions and ac- 2829 cess permissions and associated objects are assigned to the successfully approved 2830 identity of the user based on the used authentication credentials and the resulting asso- 2831 ciated role. The current session is unambiguously associated with this user. No interac- 2832 tion (e.g. access to Meter Data) is possible without an appropriate permission catalogue 2833 (FDP_ACC.2). The freeing of the role assignment and associated resources are ensured 2834 through the monitoring of the current session. 2835 page 145 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 7.2SF.2: Acceptance and Deposition of Meter Data, Encryption of 2836 Meter Data for WAN transmission 2837 The TOE receives Meter Data from an LMN communication channel and deposits these 2838 Meter Data with the associated data for tariffing in a database especially assigned to this 2839 individual Meter residing in an encrypted file system (FCS_COP.1/MEM). The time in- 2840 terval for receiving or retrieving Meter Data can be configured individually per meter 2841 through a successfully authenticated Gateway Administrator and are initialized by the 2842 TOE during the setup procedure with pre-defined values. 2843 The Meter Data are cryptographically protected and their integrity is verified by the TOE 2844 before the tariffing and deposition is performed. In case of a TLS secured communica- 2845 tion, the integrity and confidentiality of the transmitted data is protected by the TLS pro- 2846 tocol according to [RFC 5246]. In case of a unidirectional communication at 2847 IF_GW_MTR/wireless, the integrity is verified by the verification of the CMAC check sum 2848 whereas the protection of the confidentiality is given by the use of AES in CBC mode 2849 with 128 bit key length in combination with the CMAC authentication (FCS_CKM.1/MTR, 2850 FCS_COP.1/MTR). The AES encryption key has been brought into the TOE via a man- 2851 agement function during the pairing process for the Meter. In the TOE’s internal data 2852 model, the used cryptographic keys Kmac and Kenc are associated with the meter-id due 2853 to the fact of the unidirectional communication. The TOE contains a packet monitor for 2854 Meter Data to avoid replay attacks based on the re-sending of Meter Data packages. In 2855 case of recognized data packets which have already been received and processed by 2856 the TOE, these data packets are blocked by the packet monitor (FPT_RPL.1). 2857 Concerning the service layers, the TOE detects replay attacks that can occur during 2858 authentication processes against the TOE or for example receiving data from one of the 2859 involved communication networks. This is for instance achieved through the correct in- 2860 terpretation of the strictly increasing ordering numbers for messages from the meters (in 2861 case that a TLS-secured communication channel is not used), through the enforcement 2862 of an appropriate time slot of execution for successfully authenticated wake-up calls, and 2863 of course through the use of the internal means of the TLS protocol according to 2864 [RFC 5246] (FPT_RPL.1). 2865 The deposition of Meter Data is performed in a way that these Meter Data are associated 2866 with a permission profile. This means that all of the operations and actions that can be 2867 taken with these data as described afterwards (e.g. sending via WAN to an Authenti- 2868 cated External Entity) depend on the permissions which are associated with the 2869 page 146 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Meter Data. For metrological purposes, the Meter Data’s security attribute - if applicable 2870 - will be persisted associated with its corresponding Meter Data by the TOE. All user 2871 associated data stored by the TOE are protected by an AES-128-CMAC value. Before 2872 accessing these data, the TOE verifies the CMAC value that has been applied to the 2873 user data and detects integrity errors on any data and especially on user associated 2874 Meter Data in a reliable manner (FDP_SDI.2). 2875 Closely linked with the deposition of the Meter Data is the assignment of an unambigu- 2876 ous and reliable timestamp on these data. The reliability grounds on the regular use of 2877 an external time source offering a sufficient exactness (FPT_STM.1) which is used to 2878 synchronize the operating system of the TOE. A maximum deviation of 3% of the meas- 2879 uring period is allowed to be in conformance with [PP_GW]. The data set (Meter Data 2880 and tariff data) is associated with the timestamp in an inseparably manner because each 2881 Meter Data entry in the database includes the corresponding time stamp and the data- 2882 base is cryptographically protected through the encrypted file system. For details about 2883 database encryption please see page 151). 2884 For transmission of consumption data (tariffed Meter Data) or status data into the WAN, 2885 the TOE ensures that the data are encrypted and digitally signed (FCO_NRO.2, 2886 FCS_CKM.1/CMS, FCS_COP.1/CMS, FCS_COP.1/HASH, FCS_COP.1/MEM). In case 2887 of a successful transmission of consumption data into the WAN, beside the transmitted 2888 data the data’s signature applied by the TOE is logged in the Consumer-Log for the 2889 respective Consumer at IF_GW_CON thus providing the possibility not only for the re- 2890 cipient to verify the evidence of origin for the transmitted data but to the Consumer at 2891 IF_GW_CON, too (FCO_NRO.2). The encryption is performed with the hybrid encryption 2892 as specified in [TR-03109-1-I] in combination with [TR-03116-3]. The public key of the 2893 external entity, the data have to be encrypted for, is known by the TOE through the 2894 authentication data configured by the Gateway Administrator and its assigned identity. 2895 This public key is assumed by the TOE to be valid because the TOE does not verify the 2896 revocation status of certificates. The public key used for the encryption of the derived 2897 symmetric key used for transmission of consumption data is different from the public key 2898 in the TLS certificate of the external entity used for the TLS secured communication 2899 channel. The derivation of the hybrid key used for transmission of consumption data is 2900 done according to [TR-03116-3, chapter 8]. 2901 The TOE does also foresee the case that the data is encrypted for an external entity that 2902 is not directly assigned to the external entity holding the active communication channel. 2903 The electronic signature is created through the utilization of the Security Module whereas 2904 page 147 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland the TOE is responsible for the computation of the hash value for the data to be signed. 2905 Therefore, the TOE utilizes the SHA-256 or SHA-384 hash algorithm. The SHA-512 hash 2906 algorithm is available in the TOE but not yet used (FCS_COP.1/HASH). The data to be 2907 sent to the external entity are prepared on basis of the tariffed meter data. The data to 2908 be transmitted are removed through deallocation of the resources after the (successful 2909 or unsuccessful) transmission attempt so that afterwards no previous information will be 2910 available (FDP_RIP.2). The created temporary session keys which have been used for 2911 encryption of the data are also deleted by the already described zeroisation mechanism 2912 as soon they are no longer needed (FCS_CKM.4). 2913 The time interval for transmission of the data is set for a daily transmission, and can be 2914 additionally configured by the Gateway Administrator. The TOE sends randomly gener- 2915 ated messages into the WAN, so that through this the analysis of frequency, load, size 2916 or the absence of external communication is concealed (FPR_CON.1). Data that are not 2917 relevant for accounting are aliased for transmission so that no personally identifiable 2918 information (PII) can be obtained by an analysis of not billing-relevant information sent 2919 to parties in the WAN. Therefore, the TOE utilizes the alias as defined by the Gateway 2920 Administrator in the Processing Profile for the Meter identity to external parties in the 2921 WAN. Thereby, the TOE determines the alias for a user and verifies that it conforms to 2922 the alias given in the Processing Profile (FPR_PSE.1). 2923 2924 7.3SF.3: Administration, Configuration and SW Update 2925 The TOE includes functionality that allows its administration and configuration as well as 2926 updating the TOE’s complete firmware (“firmware updates”) or only the software appli- 2927 cation including the service layer (“software updates”). This functionality is only provided 2928 for the authenticated Gateway Administrator (FMT_MOF.1, FMT_MSA.1/AC, 2929 FMT_MSA.1/FW, FMT_MSA.1/MTR). 2930 The following operations can be performed by the successfully authenticated Gateway 2931 Administrator: 2932 a) Definition and deployment of Processing Profiles including user administration, 2933 rights management and setting configuration parameters of the TOE 2934 b) Deployment of tariff information 2935 c) Deployment and installation of software/firmware updates 2936 page 148 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland A complete overview of the possible management functions is given in Table 14 and 2937 Table 15 (FMT_SMF.1). Beside the possibility for a successfully authenticated Service 2938 Technician to view the system log via interface IF_GW_SRV, administrative or configu- 2939 ration measures on the TOE can only be taken by the successfully authenticated Gate- 2940 way Administrator. 2941 In order to perform these measures, the TOE has to establish a TLS secured channel 2942 to the Gateway Administrator and must authenticate the Gateway Administrator suc- 2943 cessfully. There are two possibilities: 2944 a) The TOE independently contacts the Gateway Administrator at a certain time 2945 specified in advance by the Gateway Administrator. 2946 b) Through a message sent to the wake-up service, the TOE is requested to con- 2947 tact the Gateway Administrator. 2948 In the second case, the wake-up data packet is received by the TOE from the WAN and 2949 checked by the TOE for structural correctness according to [TR-03109-1]. Afterwards, 2950 the TOE verifies the correctness of the electronic signature applied to the wake-up mes- 2951 sage data packet using the certificate of the Gateway Administrator stored in the TSF 2952 data. Afterwards, a TLS connection to the Gateway Administrator is established by the 2953 TOE and the above mentioned operations can be performed. 2954 Software/firmware updates always have to be signed by the TOE manufacturer. 2955 Software/firmware updates can be of different content: 2956 a) The whole boot image of the TOE is changed. 2957 b) Only individual components of the TOE are changed. These components can 2958 be the boot loader plus the static kernel or the SMGW application. 2959 The update packet is realized in form of an archive file enveloped into a CMS signature 2960 container according to [RFC 5652]. The electronic signature of the update packet is cre- 2961 ated using signature keys from the TOE manufacturer. The verification of this signature 2962 is performed by the TOE using the TOE's Security Module using the trust anchor of the 2963 TOE manufacturer. If the signature of the transferred data could not be successfully 2964 verified by the TOE or if the version number of the new firmware is not higher than the 2965 version number of the installed firmware, the received data is rejected by the TOE and 2966 not used for further processing. Any administrator action is entered in the System Log of 2967 the TOE. Additionally, an authorised Consumer can interact with the TOE via the 2968 page 149 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland interface IF_GW_CON to get the version number and the current time displayed 2969 (FMT_MOF.1). 2970 The signature of the update packet is immediately verified after receipt. After successful 2971 verification of the update packet the update process is immediately performed. In each 2972 case, the Gateway Administrator gets notified by the TOE and an entry in the TOE´s 2973 system log will be written. 2974 All parameters that can be changed by the Gateway Administrator are preset with re- 2975 strictive values by the TOE. No role can specify alternative initial values to override these 2976 restrictive default values (FMT_MSA.3/AC, FMT_MSA.3/FW, FMT_MSA.3/MTR). 2977 This mechanism is supported by the TOE-internal resource monitor that internally mon- 2978 itors existing connections, assigned roles and operations allowed at a specific time. 2979 2980 7.4SF.4: Displaying Consumption Data 2981 The TOE offers the possibility of displaying consumption data to authenticated Consum- 2982 ers at interface IF_GW_CON. Therefore, the TOE contains a web server that implements 2983 TLS-based communication with mutual authentication (FTP_ITC.1/USR). If the Con- 2984 sumer requests a password-based authentication from the GWA according to [TR- 2985 03109-1] and the GWA activates this authentication method for this Consumer, the TOE 2986 uses TLS authentication with server-side authentication and HTTP digest access au- 2987 thentication according to [RFC 7616]. In both cases, the requirement FCO_NRO.2 is 2988 fulfilled through the use of TLS-based communication and through encryption and digital 2989 signature of the (tariffed) Meter Data to be displayed using FCS_COP.1/HASH. 2990 To additionally display consumption data, a connection at interface IF_GW_CON must 2991 be established and the role “(authorised) Consumer” is assigned to the user with his 2992 used display unit by the TOE. Different Consumer can use different display units. The 2993 amount of allowed connection attempts at IF_GW_CON is set to 5. In case the amount 2994 of allowed connection attempts is reached, the TOE blocks IF_GW_CON (FIA_AFL.1). 2995 The display unit has to technically support the applied authentication mechanism and 2996 the HTTP protocol version 1.1 according to [RFC 2616] as communication protocol. Data 2997 is provided as HTML data stream and transferred to the display unit. In this case, further 2998 processing of the transmitted data stream is carried out by the display unit. 2999 According to [TR-03109-1], the TOE exclusively transfers Consumer specific consump- 3000 tion data to the display unit. The Consumer can be identified in a clear and unambiguous 3001 page 150 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland manner due to the applied authentication mechanism. Moreover, the TOE ensures that 3002 exclusively the data actually assigned to the Consumer is provided at the display unit 3003 via IF_GW_CON (FIA_USB.1). 3004 3005 7.5SF.5: Audit and Logging 3006 The TOE generates audit data for all actions assigned in the System-Log 3007 (FAU_GEN.1/SYS), the Consumer-Log (FAU_GEN.1/CON), and the Calibration-Log 3008 (FAU_GEN.1/CAL) as well. On the one hand, this applies to the values measured by 3009 the Meter (Consumer-Log) and on the other hand to system data (System-Log) used by 3010 the Gateway Administrator of the TOE in order to check the TOE’s current functional 3011 status. In addition, metrological entries are created in the Calibration-Log. The TOE thus 3012 distinguishes between the following log classes: 3013 a) System-Log 3014 b) Consumer-Log 3015 c) Calibration-Log 3016 The TOE audits and logs all security functions that are used. Thereby, the TOE compo- 3017 nent accomplishing this security audit functionality includes the necessary rules moni- 3018 toring these audited events and through this indicating a potential violation of the en- 3019 forcement of the TOE security functionality (e. g. in case of an integrity violation, replay 3020 attack or an authentication failure). If such a security breach is detected, it is shown as 3021 such in the log entry (FAU_SAA.1/SYS). 3022 The System-Log can only be read by the authorized Gateway Administrator via interface 3023 IF_GW_WAN or by an authorized Service Technician via interface IF_GW_SRV 3024 (FAU_SAR.1/SYS). Potential security breaches are separately indicated and identified 3025 as such in the System-Log and the GWA gets informed about this potential security 3026 breach (FAU_ARP.1/SYS, FDP_SDI.2). Data of the Consumer-Log can exclusively be 3027 viewed by authenticated Consumers via interface IF_GW_CON designed to display con- 3028 sumption data (FAU_SAR.1/CON). The data included in the Calibration-Log can only be 3029 read by the authenticated Gateway Administrator via interface IF_GW_WAN 3030 (FAU_SAR.1/CAL). 3031 If possible, each log entry is assigned to an identity that is known to the TOE. For audit 3032 events resulting from actions of identified users resp. roles, the TOE associates the 3033 page 151 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland generated log information to the identified users while generating the audit information 3034 (FAU_GEN.2). 3035 Generated audit and log data are stored in a cryptographically secured storage. For this 3036 purpose, a file-based SQL database system is used securing its’ data using an AES- 3037 XTS-128 encrypted file system (AES in XTS mode with 128-bit keys) according to 3038 [FIPS Pub. 197] and [NIST 800-38E]. This is achieved by using device-specific AES 3039 keys so that the secure environment can only be accessed with the associated symmet- 3040 ric key available. Using an appropriately limited access of this symmetric, the TOE im- 3041 plements the necessary rules so that it can be ensured that unauthorised modification 3042 or deletion is prohibited (FAU_STG.2). 3043 Audit and log data are stored in separate locations: One location is used to store Con- 3044 sumer-specific log data (Consumer-Log) whereas device status data and metrological 3045 data are stored in a separate location: status data are stored in the System-Log and 3046 metrological data are stored in the Calibration-Log. Each of these logs is located in phys- 3047 ically separate databases secured by different cryptographic keys. In case of several 3048 external meters, a separate database is created for each Meter to store the respective 3049 consumption and log data (FAU_GEN.2). 3050 If the audit trail of the System-Log or the Consumer-Log is full (so that no further data 3051 can be added), the oldest entries in the audit trail are overwritten (FAU_STG.2, 3052 FAU_STG.4/SYS, FAU_STG.4/CON). If the Consumer-Log‘s oldest audit record must 3053 be kept because the period of billing verification (of usually 15 months) has not beeen 3054 reached, the TOE’s metrological activity is paused until the oldest audit record gets 3055 deletable. Thereafter, the TOE’s metrological activity is started again through an internal 3056 timer. Moreover, the mechanism for storing log entries is designed in a way that these 3057 entries are cryptographically protected against unauthorized deletion. This is especially 3058 achieved by assigning cryptographic keys to each of the individual databases for the 3059 System-Log, Consumer-Log and Calibration-Log. 3060 If the Calibration-Log cannot store any further data, the operation of the TOE is stopped 3061 through the termination of its metering services and the TOE informs the Gateway Ad- 3062 ministrator by creating an entry in the System-Log, so that additional measures can be 3063 taken by the Gateway Administrator. Calibration-Log entries are never overwritten by 3064 the TOE (FAU_STG.2, FAU_STG.4/CAL, FMT_MOF.1). 3065 The TOE anonymizes the data in a way that no conclusions about a specific person or 3066 user can be drawn from the log or recorded not billing relevant data. Stored consumption 3067 page 152 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland data are exclusively intended for accounting with the energy supplier. The data stored 3068 in the System-Log are used for analysis purposes concerning necessary technical anal- 3069 yses and possible security-related information. 3070 7.6SF.6: TOE Integrity Protection 3071 The TOE makes physical tampering detectable through the TOE's sealed packaging of 3072 the device. So if an attacker opens the case, this can be physically noticed, e. g. by the 3073 Service Technician (FPT_PHP.1). 3074 The TOE provides a secure boot mechanism. Beginning from the AES-128-encrypted 3075 bootloader protected by a digital signature applied by the TOE manufacturer, each sub- 3076 sequent step during the boot process is based on the previous step establishing a con- 3077 tinuous forward-concatenation of cryptographical verification procedures. Thus, it is en- 3078 sured that each part of the firmware, that means the operating system, the service layers 3079 and the software application in general, is tested by the TOE during initial startup. 3080 Thereby, a test of the TSF data being part of the software application is included. During 3081 this complete self-test, it is checked that the electronic system of the physical device, 3082 and all firmware components of the TOE are in authentic condition. This complete self- 3083 test can also be run at the request of the successfully authenticated Gateway Adminis- 3084 trator via interface IF_GW_WAN or at the request of the successfully authenticated Ser- 3085 vice Technician via interface IF_GW_SRV. At the request of the successfully authenti- 3086 cated Consumer via interface IF_GW_CON, the TOE will only test the integrity of the 3087 Smart Metering software application including the service layers (without the operating 3088 system) and the completeness of the TSF data stored in the TOE’s database. Addition- 3089 ally, the TOE itself runs a complete self-test periodically at least once a month during 3090 normal operation. The integrity of TSF data stored in the TOE’s database is always 3091 tested during read access of that part of TSF data (FPT_TST.1). FPT_RPL.1 is fulfilled 3092 by the use of the TLS protocol respectively the integration of transmission counters ac- 3093 cording to [TR-03116-3, chap. 7.3], and through the enforcement of an appropriate time 3094 slot of execution for successfully authenticated wake-up calls. 3095 If an integrity violation of the TOE’s hardware or firmware is detected or if the deviation 3096 between local system time of the TOE and the reliable external time source is too large, 3097 further use of the TOE for the purpose of gathering Meter Data is not possible. Also in 3098 this case, the TOE signals the incorrect status via a suitable signal output on the case 3099 page 153 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland of the device, and the further use of the TOE for the purpose of gathering Meter Data is 3100 not allowed (FPT_FLS.1). 3101 Basically, if an integrity violation is detected, the TOE will create an entry in the System 3102 Log to document this status for the authorised Gateway Administrator on interface 3103 IF_GW_WAN resp. for the authorised Service Technician on interface IF_GW_SRV, and 3104 will inform the Gateway Administrator on this incident (FAU_ARP.1/SYS, 3105 FAU_GEN.1/SYS, FAU_SAR.1/SYS, FPT_TST.1). 3106 7.7TSS Rationale 3107 The following table shows the correspondence analysis for the described TOE security 3108 functionalities and the security functional requirements. 3109 SF.1 SF.2 SF.3 SF.4 SF.5 SF.6 FAU_ARP.1/SYS X (X) FAU_GEN.1/SYS X (X) FAU_SAA.1/SYS X FAU_SAR.1/SYS X (X) FAU_STG.4/SYS X FAU_GEN.1/CON X FAU_SAR.1/CON X FAU_STG.4/CON X FAU_GEN.1/CAL X FAU_SAR.1/CAL X FAU_STG.4/CAL X FAU_GEN.2 X page 154 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland SF.1 SF.2 SF.3 SF.4 SF.5 SF.6 FAU_STG.2 X FCO_NRO.2 X X FCS_CKM.1/TLS X FCS_COP.1/TLS X FCS_CKM.1/CMS X FCS_COP.1/CMS X FCS_CKM.1/MTR X X FCS_COP.1/MTR X X FCS_CKM.4 X X FCS_COP.1/HASH X FCS_COP.1/MEM X FDP_ACC.2 X FDP_ACF.1 X FDP_IFC.2/FW X FDP_IFF.1/FW X FDP_IFC.2/MTR X FDP_IFF.1/MTR X FDP_RIP.2 X X FDP_SDI.2 X X page 155 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland SF.1 SF.2 SF.3 SF.4 SF.5 SF.6 FIA_ATD.1 X FIA_AFL.1 X FIA_UAU.2 X FIA_UAU.5 X FIA_UAU.6 X FIA_UID.2 X FIA_USB.1 X X FMT_MOF.1 X X FMT_SMF.1 X FMT_SMR.1 X FMT_MSA.1/AC X FMT_MSA.3/AC X FMT_MSA.1/FW X FMT_MSA.3/FW X FMT_MSA.1/MTR X FMT_MSA.3/MTR X FPR_CON.1 X FPR_PSE.1 X FPT_FLS.1 X page 156 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland SF.1 SF.2 SF.3 SF.4 SF.5 SF.6 FPT_RPL.1 X X x FPT_STM.1 X FPT_TST.1 X FPT_PHP.1 X FTP_ITC.1/WAN X FTP_ITC.1/MTR X FTP_ITC.1/USR X X Table 19: Rationale for the SFR and the TOE Security Functionalities 224 3110 224 Please note that SFRs marked with “(X)” only have supporting effect on the fulfilment of the TSF. page 157 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 8 List of Tables 3111 TABLE 1: SMART METER GATEWAY PRODUCT CLASSIFICATIONS............................................... 10 3112 TABLE 2: COMMUNICATION FLOWS BETWEEN DEVICES IN DIFFERENT NETWORKS ............... 24 3113 TABLE 3: MANDATORY TOE EXTERNAL INTERFACES..................................................................... 29 3114 TABLE 4: CRYPTOGRAPHIC SUPPORT OF THE TOE AND ITS SECURITY MODULE .................... 30 3115 TABLE 5: ROLES USED IN THE SECURITY TARGET ......................................................................... 35 3116 TABLE 6: ASSETS (USER DATA).......................................................................................................... 37 3117 TABLE 7: ASSETS (TSF DATA) ............................................................................................................. 38 3118 TABLE 8: RATIONALE FOR SECURITY OBJECTIVES ........................................................................ 54 3119 TABLE 9: LIST OF SECURITY FUNCTIONAL REQUIREMENTS......................................................... 65 3120 TABLE 10: OVERVIEW OVER AUDIT PROCESSES ............................................................................ 67 3121 TABLE 11: EVENTS FOR CONSUMER LOG ........................................................................................ 72 3122 TABLE 12: CONTENT OF CALIBRATION LOG..................................................................................... 77 3123 TABLE 13: RESTRICTIONS ON MANAGEMENT FUNCTIONS.......................................................... 106 3124 TABLE 14: SFR RELATED MANAGEMENT FUNCTIONALITIES ....................................................... 111 3125 TABLE 15: GATEWAY SPECIFIC MANAGEMENT FUNCTIONALITIES ............................................ 112 3126 TABLE 16: ASSURANCE REQUIREMENTS........................................................................................ 123 3127 TABLE 17: FULFILMENT OF SECURITY OBJECTIVES ..................................................................... 127 3128 TABLE 18: SFR DEPENDENCIES ....................................................................................................... 137 3129 TABLE 19: RATIONALE FOR THE SFR AND THE TOE SECURITY FUNCTIONALITIES ................ 156 3130 3131 page 158 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 9 List of Figures 3132 FIGURE 1: THE TOE AND ITS DIRECT ENVIRONMENT..................................................................... 13 3133 FIGURE 2: THE LOGICAL INTERFACES OF THE TOE ....................................................................... 15 3134 FIGURE 3: THE PRODUCT WITH ITS TOE AND NON-TOE PARTS ................................................... 17 3135 FIGURE 4: THE TOE’S PROTOCOL STACK......................................................................................... 19 3136 FIGURE 5: CRYPTOGRAPHIC INFORMATION FLOW FOR DISTRIBUTED METERS AND GATEWAY 3137 ........................................................................................................................................................ 32 3138 3139 page 159 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 10 Appendix 3140 10.1 Mapping from English to German terms 3141 English term German term billing-relevant abrechnungsrelevant CLS, Controllable Local System dezentral steuerbare Verbraucher- oder Erzeugersysteme Consumer Anschlussnutzer; Letztverbraucher (im verbrauchenden Sinne); u.U. auch Einspeiser Consumption Data Verbrauchsdaten Gateway Kommunikationseinheit Grid Netz (für Strom/Gas/Wasser) Grid Status Data Zustandsdaten des Versorgungsnetzes LAN, Local Area Network Lokales Kommunikationsnetz LMN, Local Metrological Network Lokales Messeinrichtungsnetz Meter Messeinrichtung (Teil eines Messsystems) Processing Profiles Konfigurationsprofile Security Module Sicherheitsmodul (z.B. eine Smart Card) Service Provider Diensteanbieter Smart Meter, Smart Metering System 225 Intelligente, in ein Kommunikationsnetz eingebundene, elektronische Messeinrichtung (Messsystem) TOE EVG (Evaluierungsgegenstand) 225 Please note that the terms “Smart Meter” and “Smart Metering System” are used synonymously within this document. page 160 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland WAN, Wide Area Network Weitverkehrsnetz (für Kommunikation) 3142 page 161 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 10.2 Glossary 3143 Term Description Authenticity property that an entity is what it claims to be (according to [SD_6]) Block Tariff Tariff in which the charge is based on a series of different energy/volume rates applied to successive usage blocks of given size and supplied during a specified period. (according to [CEN]) BPL Broadband Over Power Lines, a method of power line communica- tion CA Certification Authority, an entity that issues digital certificates. CLS config CDMA Code Division Multiple Access CLS config (secondary asset) See chapter 3.2 CMS Cryptographic Message Syntax Confidentiality the property that information is not made available or disclosed to unauthorised individuals, entities, or processes (according to [SD_6]) Consumer End user of electricity, gas, water or heat (according to [CEN]). See chapter 3.1 DCP Data Co-Processor; security hardware of the CPU DLMS Device Language Message Specification DTBS Data To Be Signed EAL Evaluation Assurance Level page 162 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Term Description Energy Service Provider Organisation offering energy related services to the Consumer (ac- cording to [CEN]) ETH Ethernet external entity See chapter 3.1 firmware update See chapter 3.2 Gateway Administrator (GWA) See chapter 3.1 Gateway config (secondary asset) See chapter 3.2 Gateway time See chapter 3.2 G.hn Gigabit Home Networks GPRS General Packet Radio Service, a packet oriented mobile data ser- vice Home Area Network (HAN) In-house data communication network which interconnects domestic equipment and can be used for energy management purposes (adopted according to [CEN]). Integrity property that sensitive data has not been modified or deleted in an unauthorised and undetected manner (according to [SD_6]) IT-System Computersystem Local Area Network (LAN) Data communication network, connecting a limited number of com- munication devices (Meters and other devices) and covering a mod- erately sized geographical area within the premises of the consumer. In the context of this ST, the term LAN is used as a hypernym for HAN and LMN (according to [CEN], adopted). page 163 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Term Description Local attacker See chapter 3.4 LTE Long Term Evolution mobile broadband communication standard Meter config (secondary asset) See chapter 3.2 Local Metrological Network (LMN) In-house data communication network which interconnects metrological equipment. Meter Data See chapter 3.2 Meter Data Aggregator (MDA) Entity which offers services to aggregate metering data by grid supply point on a contractual basis. NOTE: The contract is with a supplier. The aggregate is of all that supplier's consumers connected to that particular grid supply point. The aggregate may include both metered data and data estimated by reference to standard load profiles (adopted from [CEN]) Meter Data Collector (MDC) Entity which offers services on a contractual basis to collect metering data related to a supply and provide it in an agreed format to a data aggregator (that can also be the DNO). NOTE: The contract is with a supplier or a pool. The collection may be carried out by manual or automatic means. ([CEN]) Meter Data Management System (MDMS) System for validating, storing, processing and analysing large quantities of Meter Data. ([CEN]) Metrological Area Network In-house data communication network which interconnects metrological equipment (i.e. Meters) OEM Original Equipment Manufacturer OMS Open Metering System page 164 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Term Description OCOTP On-Chip One-time-programmable Personally Identifiable Information (PII) Personally Identifiable Information refers to information that can be used to uniquely identify, contact, or locate a single person or can be used with other sources to uniquely identify a single individual. RJ45 registered jack #45; a standardized physical network interface RMII Reduced Media Independent Interface RTC Real Time Clock Service Technician Human entity being responsible for diagnostic purposes. Smart Metering System The Smart Metering System consists of a Smart Meter Gateway and connected to one or more meters. In addition, CLS (i.e. generation plants) may be connected with the gateway for dedicated communi- cation purposes. SML Smart Message Language Tariff Price structure (normally comprising a set of one or more rates of charge) applied to the consumption or production of a product or service provided to a Consumer (according to [CEN]). TCP/IP Transmission Control Protocol / Internet Protocol TLS Transport Layer Security protocol according to [RFC 5246] TOE Target of Evaluation - set of software, firmware and/or hardware possibly accompanied by guidance TSF TOE security functionality UART Universal Asynchronous Receiver Transmitter page 165 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Term Description WAN attacker See chapter 3.4 WLAN Wireless Local Area Network page 166 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland 11 Literature 3144 [CC] Common Criteria for Information Technology Security 3145 Evaluation – 3146 Part 1: Introduction and general model, April 2017, ver- 3147 sion 3.1, Revision 5, CCMB-2017-04-001, 3148 https://www.commoncriteriapor- 3149 tal.org/files/ccfiles/CCPART1V3.1R5.pdf 3150 Part 2: Security functional requirements, April 2017, ver- 3151 sion 3.1, Revision 5, CCMB-2017-04-002, 3152 https://www.commoncriteriapor- 3153 tal.org/files/ccfiles/CCPART2V3.1R5.pdf 3154 Part 3: Security assurance requirements, April 2017, ver- 3155 sion 3.1, Revision 5, CCMB-2017-04-003, 3156 https://www.commoncriteriapor- 3157 tal.org/files/ccfiles/CCPART3V3.1R5.pdf 3158 [CEN] SMART METERS CO-ORDINATION GROUP (SM-CG) 3159 Item 5. M/441 first phase deliverable – Communication – 3160 Annex: Glossary (SMCG/Sec0022/DC) 3161 [PP_GW] Protection Profile for the Gateway of a Smart Metering 3162 System (Smart Meter Gateway PP), Schutzprofil für die 3163 Kommunikationseinheit eines intelligenten Messsystems 3164 für Stoff- und Energiemengen, SMGW-PP, v.1.3, Bundes- 3165 amt für Sicherheit in der Informationstechnik, 31.03.2014 3166 [SecModPP] Protection Profile for the Security Module of a Smart Me- 3167 ter Gateway (Security Module PP), Schutzprofil für das 3168 Sicherheitsmodul der Kommunikationseinheit eines intelli- 3169 genten Messsystems für Stoff- und Energiemengen, 3170 SecMod-PP, Version 1.0.2, Bundesamt für Sicherheit in 3171 der Informationstechnik, 18.10.2013 3172 [SD_6] ISO/IEC JTC 1/SC 27 N7446, Standing Document 6 3173 (SD6): Glossary of IT Security Terminology 2009-04-29, 3174 available at 3175 page 167 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland http://www.teletrust.de/uploads/me- 3176 dia/ISOIEC_JTC1_SC27_IT_Security_Glossary_Tele- 3177 TrusT_Documentation.pdf 3178 [TR-02102] Technische Richtlinie BSI TR-02102, Kryptographische 3179 Verfahren: Empfehlungen und Schlüssellängen, Bundes- 3180 amt für Sicherheit in der Informationstechnik, Version 3181 2022-01 3182 [TR-03109] Technische Richtlinie BSI TR-03109, Version 1.1, Bun- 3183 desamt für Sicherheit in der Informationstechnik, 3184 22.09.2021 3185 [TR-03109-1] Technische Richtlinie BSI TR-03109-1, Anforderungen an 3186 die Interoperabilität der Kommunikationseinheit eines 3187 Messsystems, Version 1.1, Bundesamt für Sicherheit in 3188 der Informationstechnik, 17.09.2021 3189 [TR-03109-1-I] Technische Richtlinie BSI TR-03109-1 Anlage I, CMS- 3190 Datenformat für die Inhaltsdatenverschlüsselung und - 3191 signatur, Version 1.0.9, Bundesamt für Sicherheit in der 3192 Informationstechnik, 18.03.2013 3193 [TR-03109-1-VI] Technische Richtlinie BSI TR-03109-1 Anlage VI, Be- 3194 triebsprozesse, Version 1.0, Bundesamt für Sicherheit in 3195 der Informationstechnik, 18.03.2013 3196 [TR-03109-2] Technische Richtlinie BSI TR-03109-2, Smart Meter Ga- 3197 teway – Anforderungen an die Funktionalität und In- 3198 teroperabilität des Sicherheitsmoduls, Version 1.1, Bun- 3199 desamt für Sicherheit in der Informationstechnik, 3200 15.12.2014 3201 [TR-03109-3] Technische Richtlinie BSI TR-03109-3, Kryptographische 3202 Vorgaben für die Infrastruktur von intelligenten Messsys- 3203 temen, Version 1.1, Bundesamt für Sicherheit in der Infor- 3204 mationstechnik, 17.04.2014 3205 [TR-03109-4] Technische Richtlinie BSI TR-03109-4, Smart Metering 3206 PKI - Public Key Infrastruktur für Smart Meter Gateways, 3207 page 168 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Version 1.2.1, Bundesamt für Sicherheit in der Informati- 3208 onstechnik, 09.08.2017 3209 [TR-03109-6] Technische Richtlinie BSI TR-03109-6, Smart Meter Ga- 3210 teway Administration, Version 1.0, Bundesamt für Sicher- 3211 heit in der Informationstechnik, 26.11.2015 3212 [TR-03111] Technische Richtlinie BSI TR-03111, Elliptic Curve Cryp- 3213 tography (ECC), Version 2.1, 01.06.2018 3214 [TR-03116-3] Technische Richtlinie BSI TR-03116-3, Kryptographische 3215 Vorgaben für Projekte der Bundesregierung, Teil 3 - Intel- 3216 ligente Messsysteme, Stand 2023, Bundesamt für Sicher- 3217 heit in der Informationstechnik, 06.12.2022 3218 [AGD_Consumer] Handbuch für Verbraucher, Smart Meter Gateway, Ver- 3219 sion 4.12, 15.12.2023, Power Plus Communications AG 3220 [AGD_Techniker] Handbuch für Service-Techniker, Smart Meter Gateway, 3221 Version 5.8, 01.02.2024, Power Plus Communications 3222 AG 3223 [AGD_GWA] Handbuch für Hersteller von Smart-Meter Gateway-Admi- 3224 nistrations-Software, Smart Meter Gateway, Version 4.15, 3225 26.01.2024, Power Plus Communications AG 3226 [AGD_SEC] Auslieferungs- und Fertigungsprozeduren, Anhang Si- 3227 chere Auslieferung, Version 1.4, 12.05.2021, Power Plus 3228 Communications AG 3229 [SMGW_Logging] Logmeldungen, SMGW Version 1.3 & 2.1 & 2.1.1, Version 3230 3.4, 23.06.2023, Power Plus Communications AG 3231 [FIPS Pub. 140-2] NIST, FIPS 140-3, Security Requirements for crypto- 3232 graphic modules, 2019 3233 [FIPS Pub. 180-4] NIST, FIPS 180-4, Secure Hash Standard, 2015 3234 [FIPS Pub. 197] NIST, FIPS 197, Advances Encryption Standard (AES), 3235 2001 3236 [IEEE 1901] IEEE Std 1901-2010, IEEE Standard for Broadband over 3237 Power Line Networks: Medium Access Control and Physi- 3238 cal Layer Specifications, 2010 3239 page 169 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland [IEEE 802.3] IEEE Std 802.3-2008, IEEE Standard for Information 3240 technology, Telecommunications and information ex- 3241 change between systems, Local and metropolitan area 3242 networks, Specific requirements, 2008 3243 [ISO 10116] ISO/IEC 10116:2006, Information technology -- Security 3244 techniques -- Modes of operation for an n-bit block cipher, 3245 2006 3246 [NIST 800-38A] NIST Special Publication 800-38A, Recommendation for 3247 Block Cipher Modes of Operation: Methods and Tech- 3248 niques, December 2001, http://nvl- 3249 pubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublica- 3250 tion800-38a.pdf 3251 [NIST 800-38D] NIST Special Publication 800-38D, Recommendation for 3252 Block Cipher Modes of Operation: Galois/Counter Mode 3253 (GCM) and GMAC, M. Dworkin, November 2007, 3254 http://csrc.nist.gov/publications/nistpubs/800-38D/SP- 3255 800-38D.pdf 3256 [NIST 800-38E] NIST Special Publication 800-38E, Recommendation for 3257 Block Cipher Modes of Operation: The XTS-AES Mode 3258 for Confidentiality on Storage Devices, M. Dworkin, Janu- 3259 ary, 2010, http://csrc.nist.gov/publications/nistpubs/800- 3260 38E/nist-sp-800-38E.pdf 3261 [RFC 2104] RFC 2104, HMAC: Keyed-Hashing for Message Authenti- 3262 cation, M. Bellare, R. Canetti und H. Krawczyk, February 3263 1997, http://rfc-editor.org/rfc/rfc2104.txt 3264 [RFC 2616] RFC 2616, Hypertext Transfer Protocol - HTTP/1.1, R. 3265 Fielding, J. Gettys, J. Mogul, H. Frystyk, P. Masinter, P. 3266 Leach, T. Berners-Lee, June 1999, http://rfc-edi- 3267 tor.org/rfc/rfc2616.txt 3268 [RFC 7616] RFC 7616, HTTP Digest Access Authentication, R. 3269 Shekh-Yusef, D. Ahrens, S. Bremer, September 2015, 3270 http://rfc-editor.org/rfc/rfc7616.txt 3271 page 170 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland [RFC 3394] RFC 3394, Schaad, J. and R. Housley, Advanced En- 3272 cryption Standard (AES) Key Wrap Algorithm, September 3273 2002, http://rfc-editor.org/rfc/rfc3394.txt 3274 [RFC 3565] RFC 3565, J. Schaad, Use of the Advanced Encryption 3275 Standard (AES) Encryption Algorithm in Cryptographic 3276 Message Syntax (CMS), July 2003, http://rfc-edi- 3277 tor.org/rfc/rfc3565.txt 3278 [RFC 4493] IETF RFC 4493, The AES-CMAC Algorithm, J. H. Song, J. 3279 Lee, T. Iwata, June 2006, http://www.rfc-edi- 3280 tor.org/rfc/rfc4493.txt 3281 [RFC 5083] RFC 5083, R. Housley, Cryptographic Message Syntax 3282 (CMS) 3283 Authenticated-Enveloped-Data Content Type, November 3284 2007, http://www.ietf.org/rfc/rfc5083.txt 3285 [RFC 5084] RFC 5084, R. Housley, Using AES-CCM and AES-GCM 3286 Authenticated Encryption in the Cryptographic Message 3287 Syntax (CMS), November 2007, 3288 http://www.ietf.org/rfc/rfc5084.txt 3289 [RFC 5114] RFC 5114, Additional Diffie-Hellman Groups for Use with 3290 IETF Standards, M. Lepinski, S. Kent, January 2008, 3291 http://www.ietf.org/rfc/rfc5114.txt 3292 [RFC 5246] RFC 5246, T. Dierks, E. Rescorla, The Transport Layer 3293 Security (TLS) Protocol Version 1.2, August 2008, 3294 http://www.ietf.org/rfc/rfc5246.txt 3295 [RFC 5289] RFC 5289, TLS Elliptic Curve Cipher Suites with SHA- 3296 256/384 and AES Galois Counter Mode (GCM), E. 3297 Rescorla, RTFM, Inc., August 2008, 3298 http://www.ietf.org/rfc/rfc5289.txt 3299 [RFC 5639] RFC 5639, Elliptic Curve Cryptography (ECC) Brainpool 3300 Standard Curves and Curve Generation, M. Lochter, BSI, 3301 J. Merkle, secunet Security Networks, March 2010, 3302 http://www.ietf.org/rfc/rfc5639.txt 3303 page 171 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland [RFC 5652] RFC 5652, Cryptographic Message Syntax (CMS), R. 3304 Housley, Vigil Security, September 2009, 3305 http://www.ietf.org/rfc/rfc5652.txt 3306 [EIA RS-485] EIA Standard RS-485, Electrical Characteristics of Gener- 3307 ators and Receivers for Use in Balanced Multipoint Sys- 3308 tems, ANSI/TIA/EIA-485-A-98, 1983/R2003 3309 [EN 13757-1] M-Bus DIN EN 13757-1: Kommunikationssysteme für 3310 Zähler und deren Fernablesung Teil 1: Datenaustausch 3311 [EN 13757-3] M-Bus DIN EN 13757-3, Kommunikationssysteme für 3312 Zähler und deren Fernablesung Teil 3: Spezielle Anwen- 3313 dungsschicht 3314 [EN 13757-4] M-Bus DIN EN 13757-4, Kommunikationssysteme für 3315 Zähler und deren Fernablesung Teil 4: Zählerauslesung 3316 über Funk, Fernablesung von Zählern im SRD-Band von 3317 868 MHz bis 870 MHz 3318 [IEC-62056-5-3-8] Electricity metering – Data exchange for meter reading, 3319 tariff and load control – Part 5-3-8: Smart Message Lan- 3320 guage SML, 2012 3321 [IEC-62056-6-1] IEC-62056-6-1, Datenkommunikation der elektrischen 3322 Energiemessung, Teil 6-1: OBIS Object Identification Sys- 3323 tem, 2017, International Electrotechnical Commission 3324 [IEC-62056-6-2] IEC-62056-6-2, Datenkommunikation der elektrischen 3325 Energiemessung - DLMS/COSEM, Teil 6-2: COSEM Inter- 3326 face classes, 2017, International Electrotechnical Commis- 3327 sion 3328 [IEC-62056-21] IEC-62056-21, Direct local data exchange - Mode C, 2011, 3329 International Electrotechnical Commission 3330 [LUKS] LUKS On-Disk Format Specification Version 1.2.1, Clem- 3331 ens Fruhwirth, October 16th, 2011 3332 [PACE] The PACE-AA Protocol for Machine Readable Travel Doc- 3333 uments, and its Security, Jens Bender, Ozgur Dagdelen, 3334 page 172 of 173 © 2024 Power Plus Communications AG, Mannheim, Deutschland Marc Fischlin and Dennis Kügler, http://fc12.ifca.ai/pre- 3335 proceedings/paper_49.pdf 3336 [X9.63] ANSI X9.63, Public Key Cryptography for the Financial 3337 Services Industry: Key Agreement and Key Transport Us- 3338 ing Elliptic Curve Cryptography, 2011 3339 [G865] DVGW-Arbeitsblatt G865 Gasabrechnung, 11/2008 3340 [VDE4400] VDE-AR-N 4400:2011-09, Messwesen Strom, VDE-An- 3341 wendungsregel, 01.09.2011 3342 [DIN 43863-5] DIN: Herstellerübergreifende Identifikationsnummer für 3343 Messeinrichtungen, 2012 3344 [USB] Universal Serial Bus Specification, Revision 2.0, April 27, 3345 2000, USB Communications CLASS Specification for 3346 Ethernet Devices, http://www.usb.org/develop- 3347 ers/docs/usb20_docs/#usb20spec 3348 [ITU G.hn] G.996x Unified high-speed wireline-based home network- 3349 ing transceivers, 2018 3350 Power Plus Communications AG • Dudenstrasse 6 • 68167 Mannheim • Deutschland • www.ppc-ag.de #pwib#pigjnpiz5jnjnpo Power Plus Communications AG Dudenstraße 6, 68167 Mannheim Tel. 00 49 621 40165 100 | Fax. 00 49 621 40165 111 info@ppc-ag.de | www.ppc-ag.de