Huawei NetEngine AR6700&AR8000
Series Routers' Yunshan Software
V600R021C10SPC100Security Target
Date: 2022-11-21
Created by
Huawei NetEngine AR6700&AR8000 Series Routers’
Yunshan Software V600R021C10SPC100 Security Target
Change History
Version Date Author Comment
0.1 18/03/2022 Huawei First draft
0.2 13/06/2022 ShiZhen Minor fixes based on vendor feedback
0.3 28/06/2022 Huawei Minor fixes based on lab comments.
0.4 13/07/2022 Huawei Fixed based on lab comments.
0.5 19/07/2022 Huawei Fixed definitions of SFRs method of key
destruction in volatile storage
0.6 01/08/2022 Huawei Updated in accordance with Switch
comments
0.7 08/08/2022 Huawei Documents version from Physical
Scope updated
0.8 12/08/2022 Huawei FPT_STM_EXT.1 modified
0.9 12/08/2022 Huawei Physical Scope updated
1.0 17/11/2022 Huawei Replace FAU_STG.3 by FAU_STG_EXT.3
Update the name for FTP_ITC.1
1.1 21/11/2022 Huawei Updated Component levelling for
FAU_STG_EXT
Huawei NetEngine AR6700&AR8000 Series Routers’
Yunshan Software V600R021C10SPC100 Security Target
Table of contents
1 ST Introduction............................................................................................................................... 7
1.1 ST Reference .......................................................................................................................... 7
1.2 TOE Reference........................................................................................................................ 7
1.3 TOE Overview......................................................................................................................... 8
1.3.1 Introduction ................................................................................................................... 8
1.3.2 TOE Type ........................................................................................................................ 8
1.3.3 TOE Usage & Major Security Features........................................................................... 8
1.3.3.1 TOE usage................................................................................................................... 8
1.3.3.2 Major Security Features............................................................................................. 9
1.3.4 Non-TOE Hardware/Software/Firmware....................................................................... 9
1.4 TOE Description.................................................................................................................... 11
1.4.1 Introduction ................................................................................................................. 11
1.4.2 TOE Logical Scope ........................................................................................................ 16
1.4.2.1 Security audit ........................................................................................................... 16
1.4.2.2 Cryptographic support............................................................................................. 16
1.4.2.3 Identification and authentication ............................................................................ 17
1.4.2.4 Secure Management................................................................................................ 17
1.4.2.5 Protection of the TSF ............................................................................................... 17
1.4.2.6 TOE access through user authentication ................................................................. 17
1.4.2.7 Trusted path and channels for device authentication............................................. 17
1.4.2.8 Trusted updates ....................................................................................................... 18
1.4.3 TOE Physical Scope....................................................................................................... 18
2 Conformance Claims.................................................................................................................... 20
3 Security Problem Definition......................................................................................................... 21
3.1 Assets ................................................................................................................................... 21
3.2 Threat Agents....................................................................................................................... 21
3.3 Threats to Security............................................................................................................... 22
3.4 Organizational Security Policies........................................................................................... 23
3.5 Assumptions......................................................................................................................... 23
4 Security Objectives....................................................................................................................... 25
4.1 Security objectives for the TOE............................................................................................ 25
4.2 Security objectives for the operational environment.......................................................... 26
4.3 Security Objectives Rationale .............................................................................................. 26
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4.3.1 Threats ......................................................................................................................... 30
4.3.2 Organizational Security Policies................................................................................... 31
4.3.3 Assumptions................................................................................................................. 31
5 Extended Components Definition................................................................................................ 33
5.1 Class FAU: Security audit...................................................................................................... 33
5.1.1 Protected audit event storage (FAU_STG_EXT)........................................................... 33
5.2 Class FCS: Cryptographic support ........................................................................................ 34
5.2.1 Random Bit Generation (FCS_RBG_EXT)...................................................................... 35
5.2.2 SSH Server Protocol (FCS_SSHS_EXT) .......................................................................... 36
5.2.3 TLS Client Protocol (FCS_TLSC_EXT)............................................................................. 37
5.3 Class FIA: Identification and authentication........................................................................ 39
5.3.1 Password Management (FIA_PMG_EXT)..................................................................... 40
5.3.2 User Identification and Authentication (FIA_UIA_EXT) ............................................... 41
5.3.3 Authentication using X.509 certificates (FIA_X509_EXT)............................................. 42
5.3.4 User authentication (FIA_UAU_EXT)............................................................................ 45
5.4 Class FPT: Protection of the TSF........................................................................................... 45
5.4.1 Protection of TSF Data (FPT_SKP_EXT) ........................................................................ 46
5.4.2 Protection of Administrator Passwords (FPT_APW_EXT)............................................ 47
5.4.3 TSF Self-Test (FPT_TST_EXT) ........................................................................................ 48
5.4.4 Trusted Update (FPT_TUD_EXT) .................................................................................. 49
5.4.5 Time stamps (FPT_STM_EXT)....................................................................................... 50
5.5 Class FTA: TOE access........................................................................................................... 51
5.5.1 TSF-initiated Session Locking (FTA_SSL_EXT)............................................................... 51
6 Security Requirements................................................................................................................. 53
6.1 Security Functional Requirements....................................................................................... 53
6.1.1 FAU: Security audit....................................................................................................... 53
6.1.1.1 FAU_GEN.1: Audit data generation ......................................................................... 53
6.1.1.2 FAU_GEN.2: User identity association..................................................................... 57
6.1.1.3 FAU_STG.1: Protected audit trail storage................................................................ 57
6.1.1.4 FAU_ STG_EXT.3: Action in case of possible audit data loss.................................... 57
6.1.1.5 FAU_STG_EXT.1: Protected Audit Event Storage..................................................... 58
6.1.2 FCS: Cryptographic support ......................................................................................... 58
6.1.2.1 FCS_CKM.1: Cryptographic key generation ............................................................. 58
6.1.2.2 FCS_CKM.2: Cryptographic key distribution establishment ................................... 58
6.1.2.3 FCS_CKM.4: Cryptographic key destruction ............................................................ 58
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6.1.2.4 FCS_COP.1/DataEncryption ..................................................................................... 59
6.1.2.5 FCS_COP.1/SigGen ................................................................................................... 59
6.1.2.6 FCS_COP.1/Hash ...................................................................................................... 59
6.1.2.7 FCS_COP.1/KeyedHash ............................................................................................ 60
6.1.2.8 FCS_RBG_EXT.1: Random Bit Generation................................................................ 60
6.1.2.9 FCS_SSHS_EXT.1: SSH Server Protocol..................................................................... 60
6.1.2.10 FCS_TLSC_EXT.1: TLS Client Protocol....................................................................... 61
6.1.3 FIA: Identification and authentication......................................................................... 62
6.1.3.1 FIA_AFL.1: Authentication failure handling management ..................................... 62
6.1.3.2 FIA_UAU.7: Protected authentication feedback...................................................... 62
6.1.3.3 FIA_PMG_EXT.1: Password Management ............................................................... 62
6.1.3.4 FIA_UIA_EXT.1: User Identification and Authentication.......................................... 63
6.1.3.5 FIA_X509_EXT.1/Rev: X.509 Certificate Validation.................................................. 63
6.1.3.6 FIA_X509_EXT.2: X509 Certificate Authentication .................................................. 64
6.1.3.7 FIA_UAU_EXT.2: Password-based Authentication Mechanism............................... 64
6.1.4 FMT: Security management......................................................................................... 64
6.1.4.1 FMT_MOF.1/ManualUpdate: Management of security functions behaviour......... 64
6.1.4.2 FMT_MOF.1/Functions: Management of security functions behaviour ................. 65
6.1.4.3 FMT_MOF.1/Services: Management of security functions behaviour.................... 65
6.1.4.4 FMT_MTD.1/CoreData: Management of TSF data .................................................. 65
6.1.4.5 FMT_MTD.1/CryptoKeys: Management of TSF data............................................... 65
6.1.4.6 FMT_SMF.1: Specification of Management Functions............................................ 65
6.1.4.7 FMT_SMR.2: Restrictions on security roles ............................................................. 66
6.1.5 FTA: TOE access............................................................................................................ 66
6.1.5.1 FTA_SSL.3: TSF-initiated termination....................................................................... 66
6.1.5.2 FTA_SSL.4: User-initiated termination..................................................................... 66
6.1.5.3 FTA_TAB.1: Default TOE access banners ................................................................. 66
6.1.5.4 FTA_SSL_EXT.1: TSF-initiated Session Locking......................................................... 66
6.1.6 FTP: Trusted path/channels......................................................................................... 66
6.1.6.1 FTP_ITC.1: Inter-TSF trusted channel....................................................................... 66
6.1.6.2 FTP_TRP.1: Trusted path.......................................................................................... 67
6.1.7 FPT: Protection of the TSF............................................................................................ 67
6.1.7.1 FPT_SKP_EXT.1: Protection of TSF Data (for reading of all pre-shared, symmetric and
private keys)............................................................................................................................. 67
6.1.7.2 FPT_APW_EXT.1: Protection of Administrator Passwords ...................................... 67
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6.1.7.3 FPT_TST_EXT.1: TSF Testing..................................................................................... 68
6.1.7.4 FPT_TUD_EXT.1: Trusted Update............................................................................. 68
6.1.7.5 FPT_STM_EXT.1: Reliable Time Stamps................................................................... 68
6.2 Security Assurance Requirements ....................................................................................... 68
6.3 Security Requirements Rationale......................................................................................... 69
6.3.1 Necessity and sufficiency analysis................................................................................ 69
6.3.2 Security Requirement Sufficiency................................................................................ 73
6.3.3 SFR Dependency Rationale .......................................................................................... 75
6.3.3.1 Table of SFR dependencies ...................................................................................... 75
6.3.3.2 Justification for missing dependencies.................................................................... 77
6.3.4 SAR Rationale............................................................................................................... 77
6.3.5 SAR Dependency Rationale.......................................................................................... 78
6.3.5.1 Table of SAR dependencies...................................................................................... 78
7 TOE Summary Specification......................................................................................................... 80
7.1 Security Audit....................................................................................................................... 80
7.2 Cryptographic Support (FCS)................................................................................................ 81
7.2.1 Cryptographic Key Management ................................................................................. 81
7.2.2 Cryptographic operations ............................................................................................ 84
7.2.3 Random Number Generation....................................................................................... 85
7.2.4 SSH protocol cryptography .......................................................................................... 85
7.2.5 Transport Layer Security Cryptography ....................................................................... 86
7.3 Identification and Authentication........................................................................................ 87
7.4 TOE Management Functions................................................................................................ 89
7.5 Protection of the TSF ........................................................................................................... 90
7.6 Trusted Updates................................................................................................................... 91
7.7 TOE access............................................................................................................................ 91
7.8 Trusted path/channels......................................................................................................... 92
8 Acronyms ..................................................................................................................................... 93
9 Glossary of Terms......................................................................................................................... 95
10 Document References.............................................................................................................. 96
11 Appendices............................................................................................................................... 98
11.1 Crypto Disclaimer................................................................................................................. 98
Huawei NetEngine AR6700&AR8000 Series Routers’
Yunshan Software V600R021C10SPC100 Security Target
1 ST Introduction
1.1 ST Reference
Title: Huawei NetEngine AR6700&AR8000 Series Routers’ Yunshan Software V600R021C10SPC100
Security Target
Version: 1.1
Author: Huawei
Date of publication: 2022-11-21
This is the Security Target for the Common Criteria Evaluation of the Huawei NetEngine
AR6700&AR8000 Series Routers' Software. The TOE defined in this ST strictly consists on of the
software running on the supported hardware platforms. The Routers’ hardware is out of the scope of
the Common Criteria evaluation and, hence, not considered as part of the Target of Evaluation. The
TOE software includes TSF and non-TSF parts. These are distinguished and detailed in section 1.4.1 of
this document.
This Security Target includes in section 6 a set of Security Functional Requirements that are the taken
from [CPP_ND]. Hence, the security functionality provided by the TOE is equivalent to that described
in the mentioned Collaborative Protection Profile. Such functional requirements have been minimally
adapted or application notes have been added to them where required, since the original Protection
Profile also considers the routers’ hardware as part of the TOE.
In addition, the [CPP_ND] applies refinements to some of the SFRs in [CC31R5P2] where some
assignments are refined into selections with a closed set of options. However, these refinements are
not deemed necessary for the following SFRs
• FCS_CKM.1
• FCS_COP.1/SigGen
• FCS_COP.1/Hash
• FCS_COP.1/KeyedHash
• FMT_MOF.1/Functions
• FTP_TRP.1
• FAU_STG.1
1.2 TOE Reference
TOE Name: Huawei NetEngine AR6700&AR8000 Series Routers Software
TOE Developer: Huawei Technologies Co., Ltd.
TOE Version: V600R021C10SPC100
Huawei NetEngine AR6700&AR8000 Series Routers’
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The TOE is defined as the software running on the hardware corresponding to the following Huawei
routers: AR8140-12G10XG, AR8140-T-12G10XG, AR6710-L26T2X4, AR6710-L26T2X4-T, AR6710-
L50T2X4, AR6710-L50T2X4-T.
1.3 TOE Overview
1.3.1 Introduction
The TOE is the software running on the NetEngine AR6700&AR8000 series routers. These routers
consist of both hardware (non-TOE) and software. The software running on the routers is
denominated Yunshan software developed by Huawei. It is composed of two different software
packages: The deployment of one or the other software depends on the hardware server on which
the software is going to be hosted. The TSF of the two software is identical, so they are considered
the same TOE. Both software are identified with the same version, regardless of the hardware on
which they are deployed. They both have their own binary because the hardware where they are
deployed needs different drivers to adapt to the different physical interface board and power
modules. Yunshan software provides extensive security features, including different interfaces with
according access levels for administrators, enforcing authentications prior to establishment of
administrative sessions, auditing of security-relevant management activities. The TOE software
consists of TSF and non-TSF parts. These are listed in detail in section 1.4.1.
1.3.2 TOE Type
The TOE is software running on a network device that is connected to the network and has an
infrastructure role within the network.
1.3.3 TOE Usage & Major Security Features
1.3.3.1 TOE usage
TOE usage is summarized below:
• The TOE supports username/password, or public-key authentication mode and only users
that are authenticated can access the TOE and its command line interface (CLI).
• The TOE is accessed by CLI locally or a Network Management Server (NMS) remotely over SSH
so that a secure channel is established to protect the data between TOE and NMS. This
channel is used for TOE management by administrators.
• For secure transmission of audit information between the TOE and the Syslog server a secure
TLS channel is used.
• The TOE supports digital signature verification for software. Each of the software package or
patch package released by Huawei includes a unique digital signature. When an NMS
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distributes the package to router, the TOE will verify the online digital signature before
updating. The verification of the digital signature demonstrates the integrity and authenticity
of the package. The package is only processed further after successful verification of the
digital signature, otherwise the package will be discarded without processing. Software
integrity is verified for software update packages and for installed firmware upon every boot.
1.3.3.2 Major Security Features
The TOE is comprised of several security features. Below are identified the security features that are
considered TSF:
• Security audit
• Cryptographic support
• Identification and authentication
• Secure Management
• Protection of the TSF
• TOE access through user authentication
• Trusted path and channels for device authentication
• Trusted software updates
The TOE includes other features that are in TOE scope but are not considered TSF, such as: routing
functionality, traffic forwarding, ARP and TCP/IP management, resource management as operating
system level, BGP protocol, data packet forwarding, IS-IS dynamic routing, MAC address table
handling, or OSPF. See section 1.4.1 for details.
1.3.4 Non-TOE Hardware/Software/Firmware
The TOE provides security services when running in a single and secure device. It supports (in some
cases optionally) the following hardware, software, and firmware in its environment when the TOE is
configured as in the Figure below:
Huawei NetEngine AR6700&AR8000 Series Routers’
Yunshan Software V600R021C10SPC100 Security Target
Figure 1 Elements in the operational environment
As shown in Figure 1, the TOE functions as the edge gateway and supports multiple types of physical
links, such as Internet links. NetEngine 8000 series routers, support hybrid link access, and provide
visualized and controllable services. This reduces WAN interconnection costs and improves O&M
efficiency.
The headquarters and branches of an enterprise use routers to connect to the Internet, establish a
VPN, and use VPN tunnels to secure data.
As shown in Figure 1, the headquarters of an enterprise is connected to the Internet through a router.
LANs of branches connect to the Internet through routers. The headquarters and branches establish
GRE tunnels, and the headquarters and employees on business trips establish IPsec VPN tunnels to
secure data. After the branches and headquarters establish VPN tunnels, the branches can
communicate with each other through the headquarters.
These IT entities (like the NTP server) should be physical protected in order to ensure that no one can
attack them or steal information.
The TOE supports the following hardware, software, and firmware components in its operational
environment. All of the following environment components are supported by the TOE.
Component Usage/Purpose Description for
TOE performance
AR8140-12G10XG
AR8140-T-12G10XG
AR6710-L26T2X4
AR6710-L26T2X4-T
AR6710-L50T2X4
AR6710-L50T2X4-T
The TOE runs on these hardware platforms.
Huawei NetEngine AR6700&AR8000 series
routers are used to satisfy the requirements for
networks of various scales. They are deployed at
the edge of IP backbone networks, IP
metropolitan area networks (MANs), and other
large-scale IP networks, also can be used to
access, aggregate, and transmit carrier-class
Ethernet services on Fixed-Mobile Convergence
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Yunshan Software V600R021C10SPC100 Security Target
(FMC) Metropolitan Area Networks (MANs).
They provide network traffic processing
capacity.
Network traffic is processed and forwarded by
the underlying hardware according to routing
decisions downloaded from Yunshan software.
Network Management Server This includes any Management workstation with
an SSH client installed that is used to establish a
protected channel with the TOE
Local Console This includes any Console that is directly
connected to the TOE via the Serial Console Port
and is used by the TOE administrator to support
TOE administration.
NTP Server The TOE supports secure communications with
an NTP server in order to synchronize the date
and time on the TOE with the NTP server’s date
and time.
Syslog Server This includes any syslog server to which the TOE
would transmit syslog messages.
Table 1 Hardware, software and firmware out of evaluation scope
1.4 TOE Description
1.4.1 Introduction
This section will introduce TOE from a software architectural view. The TOE scope consists of the
software running in the router device. The hardware is out of TOE scope.
The underlying OS on which the TOE software is supported consists in a Linux operating system. The
OS provides basic services including memory management, scheduling management, file
management, and device management.
The Yunshan software is a network operating platform, which has a distributed, multi-process, and
component-based architecture. It builds upon the hardware development trend and will meet
carriers' exploding service requirements.
The Yunshan software is responsible for functional management, routing information generation,
receiving generated routing information and formatting them into hardware-specific data to direct
traffic forwarding.
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The diagram below describes which modules of the Yunshan software are part of the TSF and which
ones are not. Only the part of the TOE highlighted in green is included in the TSF.
Figure 2 Architecture and boundaries of the Target of Evaluation
Remark: Yunshan software consists of Management Plane, Control Plane, Data Plane.
• In TSF scope:
o Management Plane (MP), implements management for external access,
management for system configuration, information output on Yunshan software,
NTP.
o Framework, implements system internal scheduling, communication, management
of signals, events, timers, etc. System security functions are also implemented at this
plane.
• In TOE scope:
o Control Plane (CP), controls and manages the operation of all network protocols. The
control plane provides various network information and forwarding query entries
required for data processing and forwarding on the Data Plane;
o Data Plane (DP), processes and forwards various types of data on different ports of
the router;
o OS, provide hardware and software resource management.
• Out Of TOE scope: Hardware, provide hardware resource management.
The table below presents all the software modules that are part of the TOE and specifies which of
them are TSF and which of them are not.
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Modules TSF Description
AAA YES AAA (Authentication Authorization
Accounting), implemented in
accordance with related RFC,
provides authentication,
authorization and accounting
functionalities.
BGP NO Border Gateway Protocol, the
protocol backing the core routing
decisions on the Internet. It
maintains a table of IP networks or
'prefixes' which designate network
reachability among autonomous
systems (AS). It is described as a
path vector protocol.
Cryptographic YES RSA, ECC, ECDSA, SHA, HMAC-SHA,
AES, DRBG
Audit YES Information Center, accepts,
categorizes and filters information
generated by all components
and/or modules including log and
alarm information, and outputs
accordingly (e.g., to terminal, to
log file).
IS-IS NO Intermediate System to
Intermediate System (IS-IS) is a
dynamic routing protocol initially
designed by the International
Organization for Standardization
(ISO) for its Connectionless
Network Protocol (CLNP).
To support IP routing, the Internet
Engineering Task Force (IETF)
extends and modifies IS-IS in [RFC-
1195], which enables IS-IS to be
applied to both TCP/IP and Open
System Interconnection (OSI)
environments. This type of IS-IS is
called Integrated IS-IS or Dual IS-IS.
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OSPF NO Open Shortest Path First, is an
adaptive routing protocol for
Internet Protocol (IP) networks. It
uses a link state routing algorithm
and falls into the group of interior
routing protocols, operating within
a single autonomous system (AS).
Boot-Security YES The TSF run a suite of self-tests
during initial start-up to
demonstrate the correct operation
of the TSF, including software
integration verification by digital
signature check.
Trusted-Update YES Patches are a type of software
compatible with system software.
They are used to fix urgent bugs in
system software. You can upgrade
the system by installing patches,
without having to upgrade the
system software.
You can select a proper operation
to upgrade and maintain the
device according to the real-world
situation. Application scenarios of
these operations are as follows:
• System software upgrade
System software upgrade can
optimize device performance, add
new features, and upgrade the
current software version.
• Patch installation
SSH YES Secure Shell (SSH v2.0), provides
secure channel between end user
and the TOE, and to protect the
TOE from IP address fraud,
password interception, etc.
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TLS YES TLSv1.2 function performs loading
digital certificate revocation list,
and trusted CA file.
NTP YES The Network Time Protocol (NTP)
is an application layer protocol in
the TCP/IP protocol suite. NTP
synchronizes the time among a set
of distributed time servers and
clients. The TOE uses NTP version
3.
SDK NO The SDK configures hardware to
forward packets.
HPP NO High Performance Packet
Processer (HPP) contains "High
Performance Environment (HPE)",
"High Performance Forward
(HPF)", "High performance Stack
(HPS)" and "Host Receive and send
(HOST)".
• The HPE container is a
high-performance
execution environment
that provides the
execution environment
and function library
support for forwarding
services and forwarding
control.
• The HPF implements the
forwarding service feature,
invokes the forwarding
support interface
downwards, and connects
to the protocol stack
upwards.
• The HPS provides socket
capabilities for external
systems.
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Non-security relevant
component
NO Non-security relevant component
which are not within the scope of
this evaluation.
Table 2 Modules specifications
1.4.2 TOE Logical Scope
The TOE is comprised of several security features. Each of the security features identified above
consists of several security functionalities, as identified below.
1.4.2.1 Security audit
The log module of the host software records operations on a device and events that occur to a device.
The recorded operations and events are log messages. Log messages provide evidence for diagnosing
and maintaining a system. Log messages reflect the operating status of a device and are used to
analyze the conditions of a network and to find out the causes of network failure or faults.
Key elements of log messages include timestamp, host name, Huawei identity, version, module name,
severity, brief description, etc.
Audit component are the module processing, outputting log records. Information hierarchy is
designed to help the user roughly differentiate between information about normal operation and
information about faults. Since the information center needs to output information to the terminal,
console, log buffer, and log file.
1.4.2.2 Cryptographic support
The TOE provides cryptography in support of secure connections that includes remote administrative
management.
The cryptographic services provided by the TOE are described in Table below.
Cryptographic function Use in the TOE
DRBG Used in session establishment of TLS and SSH
RSA Used for signature verification and generation
in session establishment of TLS and SSH
SHA Used to provide cryptographic hashing services
HMAC-SHA Used to provide integrity and authentication
verification
AES Used to encrypt traffic transmitted through TLS
and SSH
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ECC Used for key generation in session
establishment of SSH
ECDSA Used for SSH public-key based authentication
ECDH Used for key establishment for TLS and SSH
communication channels
1.4.2.3 Identification and authentication
The authentication functionality provides validation by user’s account name and password. Public key
authentication is supported for SSH users. Detailed functionalities, for example max idle-timeout
period, max log-in attempts, UI lock, user kick out, can be configured by Security Administrator
according to networking environment, customized security considerations, differential user role on
TOE, and/or other operational concerns.
1.4.2.4 Secure Management
The TOE restricts the ability to determine the behavior of and modify the behavior of the function's
transmission of audit data to the security administrator. Only the security administrator can manage
the cryptographic keys. Only the security administrator has the right of opening/closing the security
services and creation/deletion/modification of the user accounts.
1.4.2.5 Protection of the TSF
The TOE protects the pre-shared keys, symmetric keys, and private keys from reading them by an
unauthorized entity. The TOE stores the users or administrator passwords in non-plaintext form
preventing them from reading. The TOE verifies the packet before their installation and uses the
digital signature. The TOE also obtains reliable timestamps from an external NTP server and performs
self-test for integrity of the software and the cryptographic functions upon each boot.
1.4.2.6 TOE access through user authentication
To protect the TOE from eavesdrop and to ensure data transmission security and confidentiality, SSH
implements:
• Authentication by password or by public-key;
• AES encryption algorithms;
• Secure cryptographic key exchange;
1.4.2.7 Trusted path and channels for device
authentication
The TOE supports the trusted connections using TLS for the communication with the audit
(syslog) server.
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1.4.2.8 Trusted updates
The TOE supports installation of software updates by Security Administrator after a successful
verification of their authenticity using secure and strong cryptographic algorithms based on digital
signatures.
1.4.3 TOE Physical Scope
This section will define the physical scope of the TOE to be evaluated.
Type Delivery Item Delivery Method Version
Product
Guidance
(AGD_PRE)
Huawei NetEngine
AR6700&AR8000 Series
Routers' Yunshan software
V600R021C10SPC100
Preparative Procedures
Distributed by e-mail in
PDF format
0.7
Product
Guidance
(AGD_OPE)
Huawei NetEngine
AR6700&AR8000 Series
Routers' Yunshan software
V600R021C10SPC100
Operational User Guidance
Distributed by e-mail in
PDF format
0.7
Upgrade
Guide
NetEngine AR V600R021C10
Upgrade Guide
Distributed by e-mail in
.docx format or digital
download available
through the HUAWEI
support website,
through authenticated
access.
01
Product
Guidance
(General)
Huawei NetEngine
AR6700&AR8000 Series
Routers' Yunshan Software
V600R021C10SPC100 Product
Documentation
Users can log in to the
HUAWEI support
website to read the
document directly or
download the product
documentation in
accordance to the
version of the TOE. The
download file format is
*.hdx, user can
1.1
Huawei NetEngine AR6700&AR8000 Series Routers’
Yunshan Software V600R021C10SPC100 Security Target
download the *.hdx
reader from the same
website.
TOE
Software
AR6700
V600R021C10SPC100.cc
The TOE software is
distributed embedded
in the non-TOE
hardware platforms
depending on the
chosen model. This
software is used by the
following hardware
devices: AR6710-
L26T2X4, AR6710-
L26T2X4-T, AR6710-
L50T2X4 and AR6710-
L50T2X4-T
V600R021C10SPC100
TOE
Software
AR8100
V600R021C10SPC100.cc
The TOE software is
distributed embedded
in the non-TOE
hardware platforms
depending on the
chosen model. This
software is used by the
following hardware
devices: AR8140-
12G10XG and AR8140-T-
12G10XG
V600R021C10SPC100
Signature
Verificatio
n Guide
PGPVerify V100R001C00
Signature Verification Guide
Distributed by e-mail in
PDF format
05
Table 3 Physical Scope
Huawei NetEngine AR6700&AR8000 Series Routers’
Yunshan Software V600R021C10SPC100 Security Target
2 Conformance Claims
This Security Target and the TOE described are in accordance with the requirements of Common
Criteria 3.1R5.
This Security Target claims conformance with the following parts of Common Criteria:
o Conformance with [CC31R5P2] extended.
o Conformance with [CC31R5P3].
The methodology to be used for the evaluation is described in the “Common Evaluation
Methodology” of the Common Criteria standard of April 2017, version 3.1 revision 5 with an
evaluation assurance level of EAL4 + ALC_FLR.2.
This Security Target does not claim conformance with any protection profile.
All the Security Functional Requirements defined in section 5, that are included in section 6 have been
taken from [CPP_ND].In terms of security functionality, this ST contains the same SFRs as a Security
Target claiming exact conformance with [CPP_ND] except for FCS_NTP_EXT.1. The TOE is not a
distributed TOE, therefore, all SFRs applicable to this TOE type are not claimed / provided by the TOE
as well as several other optional SFRs are not implemented.
The chosen assurance level chosen for this Common Criteria Evaluation is EAL4 + ALC_FLR.2, which is
a higher assurance level than that defined in [CPP_ND].
Huawei NetEngine AR6700&AR8000 Series Routers’
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3 Security Problem Definition
This section describes the security aspects of the operational environment and its expected use in
said environment. It includes the declaration of the TOE operational environment that identifies and
describes:
• The alleged known threats that will be countered by the TOE
• The organizational security policies that the TOE has to adhere to
• The TOE usage assumptions in the suggested operational environment.
We will begin defining Assets and Agents of threats.
3.1 Assets
TOE ADMINISTRATOR ACCESS: Access to an authenticated session of a Security Administrator user
on the TOE. This allows Security Administrator to perform TOE configuration modifications at an
administrative level. Potentially it could allow malicious actions that compromise the security
functionality of the TOE and the network on which the hardware where the TOE runs.
TOE NETWORK TRAFFIC: Traffic incoming and outgoing of the TOE Network interfaces, exchanged
with external entities in its operational environment. This traffic needs to be protected in
confidentiality and integrity while it is in transit between the TOE and another communication
endpoint.
TOE FIRMWARE: Executable firmware code of the TOE, which provides the TSF implementation.
Integrity must be preserved.
TOE CONFIGURATION: Those configuration parameters on which the behavior of the TOE
functionality depends. TOE configuration shall be protected against unauthorized modification
(authorization is required) and undetected modification (traceability).
ADMINISTRATIVE PASSWORDS: Passwords used to authenticate as an administrator user on the TOE.
CRYPTOGRAPHIC KEYS: Cryptographic keys used by the TOE for providing its cryptographic services.
TSF INTEGRITY: Integrity of the TOE Security Functionality must be preserved in order to guarantee
that the TOE Security Functionality is as described in this ST.
3.2 Threat Agents
ATTACKER: Any individual using the TOE services in a way that intends to vulnerate or compromise
the security of the TOE assets, such as:
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• An eavesdropper, who has access to communication channels through which TSF data are
transferred.
• An unauthorized user of the TOE, who gains unauthorized access to the TOE.
3.3 Threats to Security
This section identifies the threats to assets that require protection by the TOE. The threats are defined
in terms of assets concerned, attackers and the adverse action that materializes the threat.
T.UNAUTHORIZED_ADMINISTRATOR_ACCESS: An Attacker may attempt to gain TOE Administrator
Access to the TOE by nefarious means such as: masquerading as an Administrator to the device,
masquerading as the device to an Administrator, replaying an administrative session (in its entirety,
or selected portions), or performing man-in-the-middle attacks, which would provide access to the
administrative session, or sessions between network devices.
Successfully gaining TOE Administrator Access allows malicious actions that compromise the security
functionality of the device and the network on which it resides.
T.WEAK_CRYPTOGRAPHY: An Attacker may exploit weak cryptographic algorithms or perform a
cryptographic exhaust against the key space. Poorly chosen encryption algorithms, modes, and key
sizes will allow attackers to compromise the algorithms, or brute force exhaust the key space and give
them unauthorized access allowing them to read, manipulate and/or control the TOE Network Traffic
with minimal effort.
T.UNTRUSTED_COMMUNICATION_CHANNELS: An Attacker may attempt to target communication
channels with the TOE that do not use standardized secure tunneling protocols to protect the critical
TOE Network Traffic. Attackers may take advantage of poorly designed protocols or poor key
management to successfully perform man-in-the-middle attacks, replay attacks, etc. Successful
attacks will result in loss of confidentiality and integrity of the critical TOE Network Traffic, and
potentially could lead to a compromise of the TOE itself.
T.WEAK_AUTHENTICATION_ENDPOINTS: An Attacker may take advantage of secure protocols that
use weak methods to authenticate the endpoints – e.g. a shared password that is guessable or
transported as plaintext. The consequences are the same as a poorly designed protocol, the attacker
could masquerade as the Administrator or another device, and the attacker could insert themselves
into the network stream and perform a man-in-the-middle attack. The result is the critical TOE
Network Traffic is exposed and there could be a loss of confidentiality and integrity, and potentially
the TOE itself could be compromised if TOE Administrator Access is gained.
T.UPDATE_COMPROMISE: An Attacker may attempt to provide a compromised update of the
software or firmware which undermines the security functionality of the device. Non-validated
updates or updates validated using non-secure or weak cryptography leave the update firmware
vulnerable to surreptitious alteration, hence compromising the TOE Firmware.
T.UNDETECTED_ACTIVITY: An Attacker may attempt to access, change, and/or modify the security
functionality of the TOE by modifying the TOE Configuration without Administrator awareness. This
could result in the attacker finding an avenue (e.g., misconfiguration, flaw in the product) to
compromise the TOE and the Administrator would have no knowledge that it has been compromised.
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T.CRYPTO_KEY_COMPROMISE: An Attacker may compromise and the TOE Cryptographic Keys in
order to gain access to the TOE or TOE data by using the keys that the TOE uses for encryption of its
communication channels.
T.ADMIN_PASSWORD_COMPROMISE: An Attacker may be able to take advantage of weak
administrative passwords to use brute force attacks or massive authentication attempts to the TOE,
obtaining access to Administrative Passwords, or non-secure mechanisms for storage of keys on the
TOE may be exploited for the same purpose. If obtained, TOE Administrator Access could be gained
in an illicit way.
T.SECURITY_FUNCTIONALITY_FAILURE: An Attacker could take advantage of a failure in the security
functionality of the TOE during start-up or during operations, causing a compromise of the TSF
Integrity, and leaving the device susceptible to attackers.
3.4 Organizational Security Policies
The organizational Security policies are defined as follows.
P.ACCESS_BANNER: The TOE shall display an initial banner describing restrictions of use, legal
agreements, or any other appropriate information to which users consent by accessing the TOE.
3.5 Assumptions
The assumptions when using the TOE are the following:
A.PHYSICAL_PROTECTION: The TOE is assumed to be physically protected in its operational
environment and not subject to physical attacks that compromise the security and/or interfere with
the interconnections of the physical device where the TOE software runs, and correct operation. This
protection is assumed to be sufficient to protect the device where the TOE runs. As a result, the ST
will not include any requirements on physical tamper protection or other physical attack mitigations.
The ST will not expect the product to defend against physical access to the device that allows
unauthorized entities to extract data, bypass other controls, or otherwise manipulate the device
where the TOE runs.
A.NO_THRU_TRAFFIC_PROTECTION: The TOE does not provide any assurance regarding the
protection of traffic that traverses through it. The intent is for the TOE to protect data that originates
on or is destined to it, to include administrative data and audit data. Traffic that is traversing the TOE,
destined for another network entity, is not covered by this ST.
A.TRUSTED_ADMINISTRATOR: The Security Administrator(s) for the TOE are assumed to be trusted
and to act in the best interest of security for the organization. This includes being appropriately
trained, following policy, and adhering to guidance documentation. Administrators are trusted to
ensure passwords/credentials have sufficient strength and entropy and to lack malicious intent when
administering the TOE. The TOE is not expected to be capable of defending against a malicious
Administrator that actively works to bypass or compromise the security of the TOE.
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A.REGULAR_UPDATES: The TOE firmware and software is assumed to be updated by an Administrator
on a regular basis in response to the release of product updates due to known vulnerabilities.
A.ADMIN_CREDENTIALS_SECURE: The Administrator’s credentials used to access the network device
are protected by the platform on which they reside.
A.RESIDUAL_INFORMATION: The Administrator must ensure that there is no unauthorized access
possible for sensitive residual information (e.g. cryptographic keys, keying material, PINs, passwords
etc.) on networking equipment when the equipment is discarded or removed from its operational
environment.
Huawei NetEngine AR6700&AR8000 Series Routers’
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4 Security Objectives
The security objectives are high level declarations, concise and abstract of the solution to the problem
exposed in the former section, which counteracts the threats and fulfills the security policies and the
assumptions. These consist of:
• the security objectives for the operational environment.
• the security objectives for the TOE
4.1 Security objectives for the TOE
The security objectives for the TOE must determine (to the desired extent) the responsibility of the
TOE in countering the threats and in enforcing the OSPs. Each objective must be traced back to aspects
of identified threats to be countered by the TOE and to aspects of OSPs to be met by the TOE.
O.ADMIN_AUTH: The TOE shall require identification and authentication of administrators before
granting them access to the TOE management functions. The TOE management capabilities available
to administrators shall be defined and limited, and actions available prior to authentication shall be
limited and constrained. Administrators' authentication process shall consist in local authentication
on the TOE using passwords through a secure communication channel, and authentication sessions
will be closed by the TOE after a defined period of inactivity.
O.STRONG_CRYPTO: The TOE shall use robust cryptographic algorithms, compliant to industry
approved standards, in order to provide robust cryptographic protection of network communications.
O.TRUSTED_COMM: The TOE shall implement secure channels that use standardized tunneling
protocols to protect the critical network traffic, ensuring protection of the communications between
the TOE and trusted external entities in confidentiality, integrity, and protection against
communication replays.
O.STRONG_AUTHENTICATION_ENDPOINT: The TOE shall implement methods for robust and reliable
authentication of trusted entities with the TOE, preventing attacks based on weak authentication
methods (e.g. guessing or transported shared keys).
O.SECURE_UPDATES: The TOE shall provide to administrators the capability of installing software or
firmware updates only after a successful verification of their authenticity using secure and strong
cryptographic algorithms based on digital signatures.
O.ACTIVITY_AUDIT: The TOE shall generate audit records for relevant management actions carried
by administrators. Audit records will be marked with precise timestamps, associated to user identity,
and protected from unauthorized modification or deletion. The TOE shall send the audit records to
an external syslog server through a secure communication channel and store them locally. When local
storage is full, the TOE shall overwrite the oldest log files and generate a warning.
O.CRYPTO_KEY_PROTECTION: The TOE shall protect stored cryptographic keys in a way that prevents
unauthorized access. Management of cryptographic keys shall be restricted to Security Administrators
Huawei NetEngine AR6700&AR8000 Series Routers’
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and key destruction shall be performed in a secure way that prevents key recover from residual
information. The TOE shall not allow any access to pre-shared, symmetric and private keys.
O.PASSWORD_PROTECTION: The TOE shall protect the passwords user for local administrator
authentication by enforcing complexity and quality rules. Also, the TOE shall limit failed
authentication attempts and limit the feedback given to users on failed authentications, in order to
prevent brute force or guessing attacks. Also, the TOE shall perform secure storage of passwords,
refraining from storing them in plaintext.
O.SELF_TEST: The TOE shall perform self-tests of the TSF functionality in order to detect potential
failures during start-up or operation and prevent further situations that could lead to malfunction.
O.BANNER: The TOE shall display an advisory notice and consent about use of the TOE to
administrators before establishing an administrative user session,
4.2 Security objectives for the operational
environment
The security objectives for the Operational Environment determine the responsibility of the
environment in countering the threats, enforcing the OSPs and upholding the assumptions. Each
objective must be traced back to aspects of identified threats to be countered by the environment,
to aspects of OSPs to be enforced by the environment and to assumptions to be uphold by the
environment.
OE.PHYSICAL: Physical security, commensurate with the value of the TOE and the data it contains, is
provided by the environment.
OE.NO_THRU_TRAFFIC_PROTECTION: The TOE does not provide any protection of traffic that
traverses it. It is assumed that protection of this traffic will be covered by other security and assurance
measures in the operational environment.
OE.TRUSTED_ADMIN: TOE Administrators are trusted to follow and apply all guidance
documentation in a trusted manner.
OE.UPDATES: The TOE firmware and software is updated by a Security Administrator on a regular
basis in response to the release of product updates due to known vulnerabilities.
OE.ADMIN_CREDENTIALS_SECURE: The administrator’s credentials used to access the TOE must be
protected on any other platform on which they reside.
OE.RESIDUAL_INFORMATION: The Security Administrator ensures that there is no unauthorized
access possible for sensitive residual information (e.g. cryptographic keys, keying material, PINs,
passwords etc.) on networking equipment when the equipment is discarded or removed from its
operational environment.
4.3 Security Objectives Rationale
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The following table provides a mapping of security objectives tracing each security objective for the
TOE back to threats countered by that security objective and OSPs enforced by that security objective,
and each security objective for the operational environment back to threats countered by that
security objective, OSPs enforced by that security objective, and assumptions upheld by that security
objective. This illustrates that the security objectives counter all threats, the security objectives
enforce all OSPs and the security objectives for the operational environment uphold all assumptions.
O.ADMIN_AUTH
O.STRONG_CRYPTO
O.TRUSTED_COMM
O.STRONG_AUTHENTICATION_ENDPOINT
O.SECURE_UPDATES
O.ACTIVITY_AUDIT
O.CRYPTO_KEY_PROTECTION
O.PASSWORD_PROTECTION
O.SELF_TEST
O.BANNER
OE.PHYSICAL
OE.NO_THRU_TRAFFIC_PROTECTION
OE.TRUSTED_ADMIN
OE.UPDATES
OE.ADMIN_CREDENTIALS_SECURE
OE.RESIDUAL_INFORMATION
T.UNAUTHORIZED_ADMINISTRATOR
_ACCESS
X
T.WEAK_CRYPTOGRAPHY X
T.UNTRUSTED_COMMUNICATION_C
HANNELS
X
T.WEAK_AUTHENTICATION_ENDPOI
NTS
X
T.UPDATE_COMPROMISE X
T.UNDETECTED_ACTIVITY X
T.CRYPTO_KEY_COMPROMISE X
T.ADMIN_PASSWORD_COMPROMIS
E
X
T.SECURITY_FUNCTIONALITY_FAILU
RE
X
P.ACCESS_BANNER X
A.PHYSICAL_PROTECTION X
A.NO_THRU_TRAFFIC_PROTECTION X
Huawei NetEngine AR6700&AR8000 Series Routers’
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O.ADMIN_AUTH
O.STRONG_CRYPTO
O.TRUSTED_COMM
O.STRONG_AUTHENTICATION_ENDPOINT
O.SECURE_UPDATES
O.ACTIVITY_AUDIT
O.CRYPTO_KEY_PROTECTION
O.PASSWORD_PROTECTION
O.SELF_TEST
O.BANNER
OE.PHYSICAL
OE.NO_THRU_TRAFFIC_PROTECTION
OE.TRUSTED_ADMIN
OE.UPDATES
OE.ADMIN_CREDENTIALS_SECURE
OE.RESIDUAL_INFORMATION
A.TRUSTED_ADMINISTRATOR X
A.REGULAR_UPDATES X
A.ADMIN_CREDENTIALS_SECURE X
A.RESIDUAL_INFORMATION X
Table 4 Security Objectives vs Security Problem Definition
Huawei NetEngine AR6700&AR8000 Series Routers’
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Figure 3 Mapping of Security Problem Definition to Security Objectives
Huawei NetEngine AR6700&AR8000 Series Routers’
Yunshan Software V600R021C10SPC100 Security Target
4.3.1 Threats
T.UNAUTHORIZED_ADMINISTRATOR_ACCESS: This threat is countered by O.ADMIN_AUTH which
requires identification and authentication of administrator before granting them access to the TOE
and to management functions. It also enforces that the TOE requires identification and authentication
of administrators before granting them access to the TOE management functions.
The TOE management capabilities available to administrators shall be defined and limited, and actions
available prior to authentication shall be limited and constrained.
Administrators' authentication process shall consist in local authentication of the TOE using
passwords through a secure communication channel, and authentication sessions will be closed by
the TOE after a defined period of inactivity.
T.WEAK_CRYPTOGRAPHY: This threat is countered by O.STRONG_CRYPTO which requires usage of
robust cryptographic algorithms, compliant to industry approved standards, in order to provide
robust cryptographic protection of network communications.
T.UNTRUSTED_COMMUNICATION_CHANNELS: This threat is countered
by O.TRUSTED_COMM which requires secure communication channels that use standardized
tunneling protocols to protect the critical network traffic, ensuring protection of the communications
between the TOE and trusted external entities in confidentiality, integrity, and protection against
communication replays.
T.WEAK_AUTHENTICATION_ENDPOINTS: This threat is countered
by O.STRONG_AUTHENTICATION_ENDPOINT which requires methods for strong authentication of
trusted entities with the TOE, preventing attacks based on weak authentication methods.
T.UPDATE_COMPROMISE: This threat is countered by O.SECURE_UPDATES which requires
verification of updates authenticity by administrators based on cryptographic digital signatures.
T.UNDETECTED_ACTIVITY: This threat is countered by O.ACTIVITY_AUDIT which requires the
generation of audit records for relevant management actions carried by administrators, marked with
precise timestamps, associated to user identity, and protected from unauthorized modification or
deletion.
T.CRYPTO_KEY_COMPROMISE: This threat is countered by O.CRYPTO_KEY_PROTECTION which
requires protection of stored cryptographic keys in order to prevent unauthorized access, restricting
management of cryptographic keys to administrators, and enforcing secure key destruction methods
not allowing access to pre-shared, symmetric and private keys.
T.ADMIN_PASSWORD_COMPROMISE: This threat is countered
by O.PASSWORD_PROTECTION which requires the TOE to enforce password complexity and quality
in passwords used by administrators for authentication, hence preventing successful attacks to weak
passwords. The same objective also forbids plaintext storage of passwords in the TOE and prevents
attacks based on massive authentication attempts or guessing passwords from feedback resulting
from failed authentication attempts.
T.SECURITY_FUNCTIONALITY_FAILURE: This threat is countered by O.SELF_TEST which requires
that The TOE carries outs TSF self-tests in order to detect potential failures during start-up or
operation and prevent further situations that could lead to malfunction.
Huawei NetEngine AR6700&AR8000 Series Routers’
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The following table maps the threats of the security problem established to the security objectives of
the TOE and the security objectives of the operational environment.
Threats Security Objectives
T.UNAUTHORIZED_ADMINISTRATOR_ACCESS O.ADMIN_AUTH
T.WEAK_CRYPTOGRAPHY O.STRONG_CRYPTO
T.UNTRUSTED_COMMUNICATION_CHANNELS O.TRUSTED_COMM
T.WEAK_AUTHENTICATION_ENDPOINTS O.STRONG_AUTHENTICATION_ENDPOINT
T.UPDATE_COMPROMISE O.SECURE_UPDATES
T.UNDETECTED_ACTIVITY O.ACTIVITY_AUDIT
T.CRYPTO_KEY_COMPROMISE O.CRYPTO_KEY_PROTECTION
T.ADMIN_PASSWORD_COMPROMISE O.PASSWORD_PROTECTION
T.SECURITY_FUNCTIONALITY_FAILURE O.SELF_TEST
Table 5 Threats vs Security Objectives
4.3.2 Organizational Security Policies
P.ACCESS_BANNER: This policy is enforced by O.BANNER which requires that the TOE displays an
advisory notice and consent about use of the TOE to administrators before establishing an
administrative user session,
The following table maps the organizational security policies of the problem established to the
security objectives of the TOE and the security objectives of the operational environment.
OSPs Security Objectives
P.ACCESS_BANNER O.BANNER
Table 6 OSPs vs Security Objectives
4.3.3 Assumptions
A.PHYSICAL_PROTECTION: This assumption is directly upheld by OE.PHYSICAL, which requires that
physical protection to the TOE is provided by the operational environment.
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A.NO_THRU_TRAFFIC_PROTECTION: This assumption is directly upheld
by OE.NO_THRU_TRAFFIC_PROTECTION, which requires that the TOE does not provide any
protection of traffic that traverses it, but such protection is covered by other security and assurance
measures in the operational environment.
A.TRUSTED_ADMINISTRATOR: This assumption is directly upheld by OE.TRUSTED_ADMIN, which
requires that TOE Administrators are trusted to follow and apply all guidance documentation in a
trusted manner.
A.REGULAR_UPDATES: This assumption is directly upheld by OE.UPDATES, which requires that the
TOE firmware and software is updated by an administrator on a regular basis in response to the
release of product updates due to known vulnerabilities.
A.ADMIN_CREDENTIALS_SECURE: This assumption is directly upheld
by OE.ADMIN_CREDENTIALS_SECURE, which requires that the administrator’s credentials (private
key) used to access the TOE are protected on any other platform on which they reside.
A.RESIDUAL_INFORMATION: This assumption is directly upheld
by OE.RESIDUAL_INFORMATION which requires administrators to ensure that there is no
unauthorized access possible for sensitive residual information on networking equipment when the
equipment is discarded or removed from its operational environment.
The following table maps the assumptions of the problem established to the security objectives of the
TOE and the security objectives of the operational environment.
Assumptions Security Objectives
A.PHYSICAL_PROTECTION OE.PHYSICAL
A.NO_THRU_TRAFFIC_PROTECTION OE.NO_THRU_TRAFFIC_PROTECTION
A.TRUSTED_ADMINISTRATOR OE.TRUSTED_ADMIN
A.REGULAR_UPDATES OE.UPDATES
A.ADMIN_CREDENTIALS_SECURE OE.ADMIN_CREDENTIALS_SECURE
A.RESIDUAL_INFORMATION OE.RESIDUAL_INFORMATION
Table 7 Assumptions vs Security Objectives for the Operational Environment
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5 Extended Components Definition
5.1 Class FAU: Security audit
Security auditing involves recognising, recording, storing, and analysing information related to
security relevant activities (i.e. activities controlled by the TSF). The resulting audit records can be
examined to determine which security relevant activities took place and whom (which user) is
responsible for them.
FAU class is extended in order to add the family FAU_STG_EXT. It is defined to include new SFRs
related to audit storage features that are not covered by FAU_STG class. New family is added due to
the meaningful differences between the extended components defined and those already existing in
FAU_STG family.
5.1.1 Protected audit event storage
(FAU_STG_EXT)
Family behavior
This component defines the requirements for the TSF to be able to securely transmit audit data
between the TOE and an external IT entity.
Component levelling
FAU_STG_EXT.1 Protected audit event storage requires the TSF to use a trusted channel
implementing a secure protocol.
FAU_STG_EXT.3 Action in case of possible audit data loss requires the TSF to generate a warning
before the audit trail exceeds the local storage capacity
Management: FAU_STG_EXT.1, FAU_STG_EXT.3
The following actions could be considered for the management functions in FMT:
- The TSF shall have the ability to configure the cryptographic functionality.
Audit: FAU_STG_EXT.1, FAU_STG_EXT.3
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- No audit necessary.
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FAU_STG_EXT.1: Protected Audit Event Storage
Hierarchical to:
No other components.
Dependencies:
FAU_GEN.1
FTP_ITC.1
FAU_STG_EXT.1.1: The TSF shall be able to transmit the generated audit data to an external IT entity
using a trusted channel according to FTP_ITC.1.
FAU_STG_EXT.1.2: The TSF shall be able to store generated audit data on the TOE itself. [selection:
TOE shall consist of a single standalone component that stores audit data locally, The TOE shall be
a distributed TOE that stores audit data on the following TOE components: [assignment:
identification of TOE components], The TOE shall be a distributed TOE with storage of audit data
provided externally for the following TOE components: [assignment: list of TOE components that do
not store audit data locally and the other TOE components to which they transmit their generated
audit data]]
FAU_STG_EXT.1.3: The TSF shall [selection: drop new audit data, overwrite previous audit records
according to the following rule: [assignment: rule for overwriting previous audit records],
[assignment: other action]] when the local storage space for audit data is full.
FAU_ STG_EXT.3 Action in Case of Possible Audit Data Loss
Hierarchical to:
No other components.
Dependencies:
FAU_GEN.1 Audit data generation
FAU_STG_EXT.1 External Audit Trail Storage
FAU_STG_EXT.3.1/LocSpace The TSF shall generate a warning to inform the Administrator before
the audit trail exceeds the local audit trail storage capacity.
5.2 Class FCS: Cryptographic support
The TSF may employ cryptographic functionality to help satisfy several high-level security objectives.
These include (but are not limited to): identification and authentication, non-repudiation, trusted
path, trusted channel and data separation. This class is used when the TOE implements cryptographic
functions, the implementation of which could be in hardware, firmware and/or software.
The FCS class is composed of two families: FCS_CKM and FCS_COP. The FCS_CKM family addresses
the management aspects of cryptographic keys, while the FCS_COP family is concerned with the
operational use of those cryptographic keys.
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FCS class is extended in order to add the families FCS_TLSC_EXT, FCS_SSHS_EXTand FCS_RGB_EXT.
FCS_TLSC_EXT cover cryptographic requirements associated to TLS communications. FCS_SSHS_EXT
includes cryptographic requirements related to SSH server implementation. FCS_RGB_EXT includes
requirements for random number generators, used for supporting other cryptographic operations.
None of the requirements of those classes already exist in the Common Criteria standard.
5.2.1 Random Bit Generation (FCS_RBG_EXT)
Family behavior
Components in this family address the requirements for random bit/number generation. This is a new
family defined for the FCS class.
Component levelling
Random Bit Generation requires random bit generation to be performed in accordance with selected
standards and seeded by an entropy source.
Management: FCS_RBG_EXT.1
The following actions could be considered for the management functions in FMT:
- There are no management activities foreseen
Audit: FCS_RBG_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- Minimal: failure of the randomization process
FCS_RBG_EXT.1: Random Bit Generation
Hierarchical to:
No other components.
Dependencies:
No dependencies.
FCS_RBG_EXT.1.1: The TSF shall perform all deterministic random bit generation services in
accordance with ISO/IEC 18031:2011 using [selection: Hash_DRBG (any), HMAC_DRBG (any),
CTR_DRBG (AES)]
FCS_RBG_EXT.1.2: The deterministic RBG shall be seeded by at least one entropy source that
accumulates entropy from [selection: [assignment: number of software-based sources] software-
based noise source, [assignment: number of hardware-based sources] hardware-based noise
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source] with a minimum of [selection: 128 bits, 192 bits, 256 bits] of entropy at least equal to the
greatest security strength, according to ISO/IEC 18031:2011 Table C.1 “Security Strength Table for
Hash Functions”, of the keys and hashes that it will generate.
5.2.2 SSH Server Protocol (FCS_SSHS_EXT)
Family behavior
The component in this family addresses the ability for a server to offer SSH to protect data between
a client and the server using the SSH protocol.
Component levelling
SSH Server requires that the server side of SSH be implemented as specified.
Management: FCS_SSHS_EXT.1
The following actions could be considered for the management functions in FMT:
- There are no management activities foreseen.
Audit: FCS_SSHS_EXT.1
The following actions should be considered for audit if FAU_GEN Security audit data generation is
included in the PP/ST:
- Failure of SSH session establishment
- SSH session establishment
- SSH session termination
FCS_SSHS_EXT.1: SSH Server Protocol
Hierarchical to:
No other components.
Dependencies:
FCS_CKM.1
FCS_CKM.2
FCS_COP.1/DataEncryption
FCS_COP.1/SigGen
FCS_COP.1/Hash
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FCS_COP.1/KeyedHash
FCS_RBG_EXT.1
FCS_SSHS_EXT.1.1: The TSF shall implement the SSH protocol in accordance with: RFCs 4251, 4252,
4253, 4254, [selection: 4256, 4344, 5647, 5656, 6187, 6668, 8268, 8308 section 3.1, 8332].
FCS_SSHS_EXT.1.2: The TSF shall ensure that the SSH protocol implementation supports the
following authentication methods as described in RFC 4252: public key-based, [selection: password-
based, no other method]
FCS_SSHS_EXT.1.3: The TSF shall ensure that, as described in RFC 4253, packets greater than
[assignment: number of bytes] bytes in an SSH transport connection are dropped.
FCS_SSHS_EXT.1.4: The TSF shall ensure that the SSH transport implementation uses the following
encryption algorithms and rejects all other encryption algorithms: [selection: aes128-cbc, aes256-
cbc, aes128-ctr, aes256-ctr, AEAD_AES_128_GCM, AEAD_AES_256_GCM, aes128-
gcm@openssh.com, aes256-gcm@openssh.com]
FCS_SSHS_EXT.1.5: The TSF shall ensure that the SSH public-key based authentication
implementation uses [selection: ssh-rsa, rsa-sha2-256, rsa-sha2-512, ecdsa-sha2-nistp256, x509v3-
ssh-rsa, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521, x509v3-ecdsa-sha2-nistp256, x509v3-ecdsa-
sha2-nistp384, x509v3-ecdsa-sha2-nistp521, x509v3-rsa2048-sha256] as its public key algorithm(s)
and rejects all other public key algorithms.
FCS_SSHS_EXT.1.6: The TSF shall ensure that the SSH transport implementation uses [selection:
hmac-sha1, hmac-sha1-96, hmac-sha2-256, hmac-sha2-512, AEAD_AES_128_GCM,
AEAD_AES_256_GCM, implicit] as its MAC algorithm(s) and rejects all other MAC algorithm(s).
FCS_SSHS_EXT.1.7: The TSF shall ensure that [selection: diffie-hellman-group14-sha1, diffie-
hellman-group15-sha512, ecdh-sha2-nistp256] and [selection: diffie-hellman-group14-sha256,
diffie-hellman-group16-sha512, ecdh-sha2-nistp384, ecdh-sha2-nistp521, no other methods] are
the only allowed key exchange methods used for the SSH protocol.
FCS_SSHS_EXT.1.8: The TSF shall ensure that within SSH connections the same session keys are used
for a threshold of no longer than one hour, and no more than one gigabyte of transmitted data.
After either of the thresholds are reached a rekey needs to be performed
5.2.3 TLS Client Protocol (FCS_TLSC_EXT)
Family behavior
The component in this family addresses the ability for a client to use TLS to protect data between the
client and a server using the TLS protocol.
Component levelling
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TLS Client requires that the client side of TLS be implemented as specified.
Management: FCS_TLSC_EXT.1
The following actions could be considered for the management functions in FMT:
- There are no management activities foreseen.
Audit: FCS_TLSC_EXT.1
The following actions should be considered for audit if FAU_GEN Security audit data generation is
included in the PP/ST:
- Failure of TLS session establishment
- TLS session establishment
- TLS session termination
FCS_TLSC_EXT.1: TLS Client Protocol
Hierarchical to:
No other components.
Dependencies:
FCS_CKM.1
FCS_CKM.2
FCS_COP.1/DataEncryption
FCS_COP.1/SigGen
FCS_COP.1/Hash
FCS_COP.1/KeyedHash
FCS_RBG_EXT.1
FCS_TLSC_EXT.1.1: The TSF shall implement [selection: TLS 1.2 (RFC 5246), TLS 1.1 (RFC 4346)] and
reject all other TLS and SSL versions. The TLS implementation will support the following ciphersuites
[selection: TLS_RSA_WITH_AES_128_CBC_SHA as defined in RFC 3268,
TLS_RSA_WITH_AES_256_CBC_SHA as defined in RFC 3268,
TLS_DHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 3268,
TLS_DHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 3268,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 4492,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 4492,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA as defined in RFC 4492,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA as defined in RFC 4492,
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TLS_RSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5246, TLS_RSA_WITH_AES_256_CBC_
SHA256 as defined in RFC 5246, TLS_DHE_RSA_WITH_AES_128_CBC_ SHA256 as defined in RFC
5246, TLS_DHE_RSA_WITH_AES_256_CBC_ SHA256 as defined in RFC 5246,
TLS_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5288,
TLS_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5288,
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5288,
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5288,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5289,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 as defined in RFC 5289,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289,
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5289,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 as defined in RFC 5289]
FCS_TLSC_EXT.1.2: The TSF shall verify that the presented identifier matches [selection: the
reference identifier per RFC 6125 section 6, IPv4 address in CN or SAN, IPv6 address in the CN or SAN,
IPv4 address in SAN, IPv6 address in the SAN, the identifier per RFC 5280 Appendix A using [selection:
id-at-commonName, id-at-countryName, id-at-dnQualifier, idat-generationQualifier, id-at-
givenName, id-at-initials, id-at-localityName, id-at-name, id-atorganizationalUnitName, id-at-
organizationName, id-at-pseudonym, id-at-serialNumber, idat-stateOrProvinceName, id-at-
surname, id-at-title] and no other attribute types].
FCS_TLSC_EXT.1.3: When establishing a trusted channel, by default the TSF shall not establish a
trusted channel if the server certificate is invalid. The TSF shall also [selection: Not implement any
administrator override mechanism, require administrator authorization to establish the connection
if the TSF fails to [selection: match the reference identifier, validate certificate path, validate
expiration date, determine the revocation status] of the presented server certificate.
FCS_TLSC_EXT.1.4: The TSF shall [selection: not present the Supported Elliptic Curves Extension,
present the Supported Elliptic Curves Extension with the following NIST curves: [selection:
secp256r1, secp384r1, secp521r1] and no other curves] in the Client Hello.
5.3 Class FIA: Identification and
authentication
Families in this class address the requirements for functions to establish and verify a claimed user
identity.
Identification and Authentication is required to ensure that users are associated with the proper
security attributes (e.g. identity, groups, roles, security or integrity levels).
The unambiguous identification of authorized users and the correct association of security attributes
with users and subjects is critical to the enforcement of the intended security policies. The families in
this class deal with determining and verifying the identity of users, determining their authority to
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interact with the TOE, and with the correct association of security attributes for each authorized user.
Other classes of requirements (e.g. User Data Protection, Security Audit) are dependent upon correct
identification and authentication of users in order to be effective.
FIA class is extended in order to add the families FIA_X509_EXT, FIA_UIA_EXT, FIA_PGM_EXT, and
FIA_UAU_EXT.
Those families are defined to include new SFRs related to identification based on X509 cryptography
(FIA_X509_EXT), common requirements for identification and authentication (FIA_UIA_EXT),
password management requirements (FIA_PGM_EXT) and additional user authentication
requirements (FIA_UAU_EXT). In the case of FIA_UAU_EXT, this new family is added due to the
meaningful differences between the extended components defined and those already existing in
FIA_UAU family.
5.3.1 Password Management (FIA_PMG_EXT)
Family behavior
The TOE defines the attributes of passwords used by administrative users to ensure that strong
passwords and passphrases can be chosen and maintained.
Component levelling
Password management requires the TSF to support passwords with varying composition
requirements, minimum lengths, maximum lifetime, and similarity constraints.
Management: FIA_PMG_EXT.1
No management functions.
Audit: FIA_PMG_EXT.1
No specific audit requirements.
FIA_PMG_EXT.1: Password Management
Hierarchical to:
No other components.
Dependencies:
No dependencies.
FIA_PMG_EXT.1.1: The TSF shall provide the following password management capabilities for
administrative passwords:
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a) Passwords shall be able to be composed of any combination of upper and lower case letters,
numbers, and the following special characters: [selection: "!", "@", "#", "$", "%", "^", "&", "*",
"(", ")", [assignment: other characters]]
b) Minimum password length shall be configurable to between [assignment: minimum number of
characters supported by the TOE] and [assignment: number of characters greater than or equal
to 15] characters.
5.3.2 User Identification and Authentication
(FIA_UIA_EXT)
Family behavior
The TSF allows certain specified actions before the non-TOE entity goes through the identification and
authentication process.
Component levelling
User Identification and Authentication requires Administrators (including remote Administrators) to
be identified and authenticated by the TOE, providing assurance for that end of the communication
path. It also ensures that every user is identified and authenticated before the TOE performs any
mediated functions
Management: FIA_UIA_EXT.1
The following actions could be considered for the management functions in FMT:
- Ability to configure the list of TOE services available before an entity is identified and authenticated
Audit: FIA_UIA_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- All use of the identification and authentication mechanism
- Provided user identity, origin of the attempt (e.g. IP address)
FIA_UIA_EXT.1: User Identification and Authentication
Hierarchical to:
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FIA_UAU.1
FIA_UID.1
Dependencies:
FTA_TAB.1
FIA_UIA_EXT.1.1: The TSF shall allow the following actions prior to requiring the non-TOE entity to
initiate the identification and authentication process:
a) Display the warning banner in accordance with FTA_TAB.1
b) [selection: no other actions, automated generation of cryptographic keys, [assignment: list of
services, actions performed by the TSF in response to non-TOE requests]]
FIA_UIA_EXT.1.2: The TSF shall require each administrative user to be successfully identified and
authenticated before allowing any other TSF-mediated actions on behalf of that administrative
user.
5.3.3 Authentication using X.509 certificates
(FIA_X509_EXT)
Family behavior
This family defines the behaviour, management, and use of X.509 certificates for functions to be
performed by the TSF. Components in this family require validation of certificates according to a
specified set of rules, use of certificates for authentication for protocols and integrity verification, and
the generation of certificate requests.
Component levelling
X509 Certificate Validation, requires the TSF to check and validate certificates in accordance with the
RFCs and rules specified in the component.
X509 Certificate Authentication, requires the TSF to use certificates to authenticate peers in protocols
that support certificates, as well as for integrity verification and potentially other functions that
require certificates.
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Management: FIA_X509_EXT.1
The following actions could be considered for the management functions in FMT:
- Remove imported X.509v3 certificates
- Approve import and removal of X.509v3 certificates
- Initiate certificate requests
Management: FIA_X509_EXT.2
The following actions could be considered for the management functions in FMT:
- Remove imported X.509v3 certificates
- Approve import and removal of X.509v3 certificates
- Initiate certificate requests
Audit: FIA_X509_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- Minimal: No specific audit requirements are specified.
Audit: FIA_X509_EXT.2
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- Minimal: No specific audit requirements are specified.
FIA_X509_EXT.1: X.509 Certificate Validation
Hierarchical to:
No other components.
Dependencies:
FIA_X509_EXT.2 X.509 Certificate Authentication.
FIA_X509_EXT.1.1: The TSF shall validate certificates in accordance with the following rules:
• RFC 5280 certificate validation and certification path validation supporting a minimum path
length of three certificates.
• The certification path must terminate with a trusted CA certificate designated as a trust anchor.
• The TSF shall validate a certification path by ensuring that all CA certificates in the certification
path contain the basicConstraints extension with the CA flag set to TRUE.
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• The TSF shall validate the revocation status of the certificate using [selection: the Online
Certificate Status Protocol (OCSP) as specified in RFC 6960, a Certificate Revocation List (CRL) as
specified in RFC 5280 Section 6.3, Certificate Revocation List (CRL) as specified in RFC 5759
Section 5]
• The TSF shall validate the extendedKeyUsage field according to the following rules:
• Certificates used for trusted updates and executable code integrity verification shall have
the Code Signing purpose (id-kp 3 with OID 1.3.6.1.5.5.7.3.3) in the extendedKeyUsage field.
• Server certificates presented for TLS shall have the Server Authentication purpose (id-kp 1
with OID 1.3.6.1.5.5.7.3.1) in the extendedKeyUsage field.
• Client certificates presented for TLS shall have the Client Authentication purpose (id-kp 2
with OID 1.3.6.1.5.5.7.3.2) in the extendedKeyUsage field.
• OCSP certificates presented for OCSP responses shall have the OCSP Signing purpose (id-kp
9 with OID 1.3.6.1.5.5.7.3.9) in the extendedKeyUsage field.
FIA_X509_EXT.1.2: The TSF shall only treat a certificate as a CA certificate if the basicConstraints
extension is present and the CA flag is set to TRUE.
FIA_X509_EXT.2: X509 Certificate Authentication
Hierarchical to:
No other components.
Dependencies:
FIA_X509_EXT.1
FIA_X509_EXT.2.1: The TSF shall use X.509v3 certificates as defined by RFC 5280 to support
authentication for [selection: DTLS, HTTPS, IPsec, SSH, TLS, no protocols] and [selection: code signing
for system software updates[assignment: other uses], no additional uses].
FIA_X509_EXT.2.2: When the TSF cannot establish a connection to determine the validity of a
certificate, the TSF shall [selection: allow the Administrator to choose whether to accept the
certificate in these cases, accept the certificate, not accept the certificate]
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5.3.4 User authentication (FIA_UAU_EXT)
Family behavior
Provides for a locally based administrative user authentication mechanism.
Component levelling
The password-based authentication mechanism provides administrative users a locally based
authentication mechanism.
Management: FIA_UAU_EXT.2
The following actions could be considered for the management functions in FMT:
- None
Audit: FIA_UAU_EXT.2
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- Minimal: All use of the authentication mechanism
FIA_UAU_EXT.2: Password-based Authentication Mechanism
Hierarchical to:
No other components.
Dependencies:
No dependencies.
FIA_UAU_EXT.2.1: The TSF shall provide a local [selection: password-based, SSH public key-based,
certificate-based, [assignment: no other authentication mechanism]] authentication mechanism to
perform local administrative user authentication.
5.4 Class FPT: Protection of the TSF
This class contains families of functional requirements that relate to the integrity and management
of the mechanisms that constitute the TSF and to the integrity of TSF data. In some sense, families in
this class may appear to duplicate components in the FDP class; they may even be implemented using
the same mechanisms. However, FDP focuses on user data protection, while FPT focuses on TSF data
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protection. In fact, components from the FPT class are necessary to provide requirements that the
SFPs in the TOE cannot be tampered with or bypassed.
From the point of view of this class, regarding to the TSF there are three significant elements:
o The TSF's implementation, which executes and implements the mechanisms that
enforce the SFRs.
o The TSF's data, which are the administrative databases that guide the enforcement
of the SFRs.
o The external entities that the TSF may interact with in order to enforce the SFRs.
FPT class is extended in order to add the families FPT_TUD_EXT, FPT_TST_EXT, FPT_STM_EXT,
FPT_SKP_EXT and FPT_APW_EXT. In the case of FPT_TST_EXT, a self-test requirement for the TOE is
added that presents meaningful differences with those existing in FPT_TST. The rest of the mentioned
families include new requirements related to TOE self-protection that are not covered in any of the
existing FPT families of the Common Criteria standard.
5.4.1 Protection of TSF Data (FPT_SKP_EXT)
Family behavior
Components in this family address the requirements for managing and protecting TSF data, such as
cryptographic keys. This is a new family modelled after the FPT_PTD Class.
Component levelling
Protection of TSF Data (for reading all symmetric keys), requires preventing symmetric keys from
being read by any user or subject. It is the only component of this family.
Management: FPT_SKP_EXT.1
The following actions could be considered for the management functions in FMT:
- There are no management activities foreseen.
Audit: FPT_SKP_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- There are no auditable events foreseen.
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FPT_SKP_EXT.1: Protection of TSF Data (for reading of all pre-shared,
symmetric and private keys)
Hierarchical to:
No other components.
Dependencies:
No dependencies.
FPT_SKP_EXT.1.1: The TSF shall prevent reading of all pre-shared keys, symmetric keys, and private
keys.
5.4.2 Protection of Administrator Passwords
(FPT_APW_EXT)
Family behavior
Components in this family ensure that the TSF will protect plaintext credential data such as passwords
from unauthorized disclosure.
Component levelling
Protection of Administrator passwords requires that the TSF prevent plaintext credential data from
being read by any user or subject.
Management: FPT_APW_EXT.1
The following actions could be considered for the management functions in FMT:
- No management functions.
Audit: FPT_APW_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- No audit necessary.
FPT_APW_EXT.1: Protection of Administrator Passwords
Hierarchical to:
No other components.
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Dependencies:
No dependencies.
FPT_APW_EXT.1.1: The TSF shall store passwords in non-plaintext form.
FPT_APW_EXT.1.2: The TSF shall prevent the reading of plaintext passwords.
5.4.3 TSF Self-Test (FPT_TST_EXT)
Family behavior
Components in this family address the requirements for self-testing the TSF for selected correct
operation.
Component levelling
Self-Test requires a suite of self-tests to be run during initial start-up in order to demonstrate correct
operation of the TSF.
Management: FPT_TST_EXT.1
The following actions could be considered for the management functions in FMT:
- No management functions.
Audit: FPT_TST_EXT.1
The following actions should be considered for audit if FAU_GEN Security audit data generation is
included in the PP/ST:
- Indication that TSF self-test was completed
- Failure of self-test
FPT_TST_EXT.1: TSF Testing
Hierarchical to:
No other components.
Dependencies:
No dependencies.
FPT_TST_EXT.1.1: The TSF shall run a suite of the following self-tests [selection: during initial start-
up (on power on), periodically during normal operation, at the request of the authorised user, at
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the conditions [assignment: conditions under which self-tests should occur]] to demonstrate the
correct operation of the TSF: [assignment: list of self-tests run by the TSF]
5.4.4 Trusted Update (FPT_TUD_EXT)
Family behavior
Components in this family address the requirements for updating the TOE firmware and/or software.
Component levelling
Trusted Update requires management tools be provided to update the TOE firmware and software,
including the ability to verify the updates prior to installation.
Management: FPT_TUD_EXT.1
The following actions could be considered for the management functions in FMT:
- Ability to update the TOE and to verify the updates
- Ability to update the TOE and to verify the updates using the digital signature capability
(FCS_COP.1/SigGen)
- Ability to update the TOE and to verify the updates using the digital signature capability prior to
installing those updates
Audit: FPT_TUD_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- Initiation of the update process.
- Any failure to verify the integrity of the update
FPT_TUD_EXT.1: Trusted Update
Hierarchical to:
No other components.
Dependencies:
FCS_COP.1/SigGen or FCS_COP.1/Hash
FPT_TUD_EXT.1.1: The TSF shall provide [assignment: Administrators] the ability to query the
currently executing version of the TOE firmware/software and [selection: the most recently installed
version of the TOE firmware/software, no other TOE firmware/software version]
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FPT_TUD_EXT.1.2: The TSF shall provide [assignment: Administrators] the ability to manually
initiate updates to TOE firmware/software and [selection: support automatic checking for updates,
support automatic updates, no other update mechanism]
FPT_TUD_EXT.1.3: The TSF shall provide means to authenticate firmware/software updates to the
TOE using a [selection: digital signature mechanism, published hash] prior to installing those
updates.
5.4.5 Time stamps (FPT_STM_EXT)
Family behavior
Components in this family extend FPT_STM requirements by describing the source of time used in
timestamps.
Component levelling
Reliable Time Stamps is hierarchic to FPT_STM.1: it requires that the TSF provide reliable time stamps
for TSF and identifies the source of the time used in those timestamps.
Management: FPT_STM_EXT.1
The following actions could be considered for the management functions in FMT:
- Management of the time
- Administrator setting of the time.
Audit: FPT_STM_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- Discontinuous changes to the time.
FPT_STM_EXT.1: Reliable Time Stamps
Hierarchical to:
FPT_STM.1
Dependencies:
No dependencies.
FPT_STM_EXT.1.1: The TSF shall be able to provide reliable time stamps for its own use.
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FPT_STM_EXT.1.2: The TSF shall [selection: allow the Security Administrator to set the time,
synchronise time with an NTP server]
5.5 Class FTA: TOE access
This family specifies functional requirements for controlling the establishment of a user's session.
FTA class is extended in order to add the family FTA_SSL_EXT. This class includes requirements for
authenticated sessions, considering different requirements for local and remote user sessions.
5.5.1 TSF-initiated Session Locking
(FTA_SSL_EXT)
Family behavior
Components in this family address the requirements for TSF-initiated and user-initiated locking,
unlocking, and termination of interactive sessions.
The extended FTA_SSL_EXT family is based on the FTA_SSL family.
Component levelling
TSF-initiated session locking, requires system initiated locking of an interactive session after a
specified period of inactivity. It is the only component of this family.
Management: FTA_SSL_EXT.1
The following actions could be considered for the management functions in FMT:
- Specification of the time of user inactivity after which lock-out occurs for an individual user.
Audit: FTA_SSL_EXT.1
The following actions should be auditable if FAU_GEN Security audit data generation is included in
the PP/ST:
- Any attempts at unlocking an interactive session.
FTA_SSL_EXT.1: TSF-initiated Session Locking
Hierarchical to:
No other components.
Dependencies:
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FIA_UAU.1
FTA_SSL_EXT.1.1: The TSF shall, for local interactive sessions [selection: lock the session - disable
any activity of the Administrator’s data access/display devices other than unlocking the session,
and requiring that the Administrator re-authenticate to the TSF prior to unlocking the session,
terminate the session] after a Security Administrator-specified time period of inactivity.
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6 Security Requirements
This section defines the Security functional requirements (SFRs) and the Security assurance
requirements (SARs) that fulfill the TOE. Assignment, selection, iteration and refinement operations
have been made, adhering to the following conventions:
• Assignments. They appear between square brackets. The word “assignment” is maintained
and the resolution is presented in boldface, italic and blue color.
• Selections. They appear between square brackets. The word “selection” is maintained and
the resolution is presented in boldface, italic and blue color.
• Iterations. It includes “/” and an “identifier” following requirement identifier that allows to
distinguish the iterations of the requirement. Example: FCS_COP.1/XXX.
• Refinements: the text where the refinement has been done is shown boldface, italic, and
light red color. Where part of the content of a SFR component has been removed, the
removed text is shown in boldface, italic, light red color and crossed out.
6.1 Security Functional Requirements
6.1.1 FAU: Security audit
6.1.1.1 FAU_GEN.1: Audit data generation
FAU_GEN.1.1 The TSF shall be able to generate an audit record of the following auditable events:
a) Start-up and shutdown of the audit functions;
b) All auditable events for the [selection: not specified] level of audit; and
c) [assignment: All administrative actions comprising:
- Administrative login and logout (name of user account shall be logged if individual user
accounts are required for administrators).
- Changes to TSF data related to configuration changes (in addition to the information that a
change occurred it shall be logged what has been changed).
- Generating/import of, changing, or deleting of cryptographic keys (in addition to the action
itself a unique key name or key reference shall be logged).
- Resetting passwords (name of related user account shall be logged).
- Starting and stopping services.
Specifically defined auditable events listed in the table presented in the next application note.]
.
FAU_GEN.1.2 The TSF shall record within each audit record at least the following information:
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a) Date and time of the event, type of event, subject identity (if applicable), and the outcome
(success or failure) of the event; and
b) For each audit event type, based on the auditable event definitions of the functional components
included in the PP/ST, [assignment: information specified in column three of the table presented
in the next application note.] .
Application Note
The following table presents the list of auditable events.
Requirement Auditable Events Additional Audit Record
Contents
FAU_GEN.1 None. None.
FAU_GEN.2 None. None.
FAU_STG_EXT.1 None. None.
FCS_CKM.1 None. None.
FCS_CKM.2 None. None.
FCS_CKM.4 None. None.
FCS_COP.1/DataEncryption None. None.
FCS_COP.1/SigGen None. None.
FCS_COP.1/Hash None. None.
FCS_COP.1/KeyedHash None. None.
FCS_RBG_EXT.1 None. None.
FIA_AFL.1 Unsuccessful login
attempts limit is met or
exceeded
Origin of the attempt
(e.g., IP address).
FIA_PMG_EXT.1 None. None.
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FIA_UIA_EXT.1 All use of the
identification and
authentication
mechanism
Origin of the attempt
(e.g. IP address).
FIA_UAU_EXT.2 All use of the
identification and
authentication
mechanism.
Origin of the attempt
(e.g. IP address).
FIA_UAU.7 None. None.
FMT_MOF.1/ManualUpdate Any attempt to initiate a
manual update
None.
FMT_MTD.1/CoreData None. None.
FMT_SMF.1 All management
activities of TSF data.
None.
FMT_SMR.2 None. None.
FPT_SKP_EXT.1 None. None.
FPT_APW_EXT.1 None. None.
FPT_TST_EXT.1 None. None.
FPT_TUD_EXT.1 Initiation of update;
result of the update
attempt (success or
failure).
None.
FPT_STM_EXT.1 Discontinuous changes to
time - either
Administrator actuated
or changed via an
automated process.
(Note that no continuous
changes to time need to
be logged. See also
application note on
FPT_STM_EXT.1)
For discontinuous
changes to time: The old
and new values for the
time. Origin of the
attempt to change time
for success and failure
(e.g. IP address).
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FTA_SSL_EXT.1 The termination of a local
session by the session
locking mechanism.
None.
FTA_SSL.3 The termination of a
remote session by the
session locking
mechanism.
None.
FTA_SSL.4 The termination of an
interactive session.
None.
FTA_TAB.1 None. None.
FTP_ITC.1 Initiation of the trusted
channel. Termination of
the trusted channel.
Failure of the trusted
channel functions.
Identification of the
initiator and target of
failed trusted channels
establishment attempt.
FTP_TRP.1 Initiation of the trusted
path. Termination of the
trusted path. Failures of
the trusted path
functions.
None.
FAU_STG.1 None. None.
FAU_ STG_EXT.3 Low storage space for
audit events.
None.
FCS_SSHS_EXT.1 Failure to establish an
SSH session.
Reason for failure.
FCS_TLSC_EXT.1 Failure to establish a TLS
Session.
Reason for failure.
FIA_X509_EXT.1/Rev Unsuccessful attempt to
validate a certificate.
Any addition,
replacement or removal
Reason for failure of
certificate validation
Identification of
certificates added,
replaced or removed as
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of trust anchors in the
TOE's trust store
trust anchor in the TOE's
trust store
FMT_MOF.1/Services None None.
FMT_MOF.1/Functions None. None.
FMT_MTD.1/CryptoKeys None None.
Table 8 Security Functional Requirements and Auditable Events
Application Note
Audit functionality is enabled by default. The auditing functionality cannot be disabled.
Application Note
The TOE does not support using reset command to reset password directly, but it can modify
password in the following way: re-create local-user or change local-user password.
6.1.1.2 FAU_GEN.2: User identity association
FAU_GEN.2.1 For audit events resulting from actions of identified users, the TSF shall be able to
associate each auditable event with the identity of the user that caused the event.
6.1.1.3 FAU_STG.1: Protected audit trail storage
FAU_STG.1.1 The TSF shall protect the stored audit records in the audit trail from unauthorised
deletion.
FAU_STG.1.2 The TSF shall be able to [selection: prevent] unauthorized modifications to the stored
audit records in the audit trail.
6.1.1.4 FAU_ STG_EXT.3: Action in case of possible audit
data loss
FAU_ STG_EXT.3.1 The TSF shall generate a warning to inform the Administrator before the audit trail
exceeds the local audit trail storage capacity.
Application Note
The audit data is stored in the Internal flash of the non-TOE hardware platform. Oldest files are
deleted to save latest log files in case of audit trail exceeds storage capacity. Audit records could be
“invisibly lost” if enough audit records are generated to overwrite the recorded warning. Audit logs
are stored in the audit partition. The size of the partition is limited. If the logs reaches the upper limit,
the logs are written cyclically.
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6.1.1.5 FAU_STG_EXT.1: Protected Audit Event Storage
FAU_STG_EXT.1.1 The TSF shall be able to transmit the generated audit data to an external IT entity
using a trusted channel according to FTP_ITC.1.
FAU_STG_EXT.1.2 The TSF shall be able to store generated audit data on the TOE itself. [selection:
TOE shall consist of a single standalone component that stores audit data locally]
Application Note
The TOE consists only in software. The storage is done by the TOE software in the local non-TOE
hardware platform in which the TOE runs.
FAU_STG_EXT.1.3 The TSF shall [selection: overwrite previous audit records according to the
following rule: [assignment: overwrite the oldest log information always]] when the local storage
space for audit data is full.
6.1.2 FCS: Cryptographic support
6.1.2.1 FCS_CKM.1: Cryptographic key generation
FCS_CKM.1.1 The TSF shall generate asymmetric cryptographic keys in accordance with a specified
cryptographic key generation algorithm [assignment: RSA and ECC schemes] and specified
cryptographic key sizes [assignment: 2048 bits or greater (RSA) and P-256, P-384 and P-521 (ECC)]
that meet the following: [assignment: FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix
B.3 (RSA) and FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.4 (ECC)].
Application Note
The compliance to FIPS PUB 186-4 is limited to Appendix B.3 and Appendix B.4, in particular:
• Generation of random primes (B.3.2 and B.3.3).
• Generation of random primes with conditions (B.3.4, B.3.5 and B.3.6).
• Generation using extra random bits (B.4.1)
• Generation by testing candidates (B.4.2)
6.1.2.2 FCS_CKM.2: Cryptographic key distribution
establishment
FCS_CKM.2.1 The TSF shall distribute cryptographic keys perform cryptographic key establishment
in accordance with a specified cryptographic key distribution establishment method [assignment:
Elliptic curve-based key establishment schemes] that meets the following: [assignment: NIST Special
Publication 800-56A Revision 3, “Recommendation for Pair-Wise Key Establishment Schemes Using
Discrete Logarithm Cryptography”].
6.1.2.3 FCS_CKM.4: Cryptographic key destruction
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FCS_CKM.4.1 The TSF shall destroy cryptographic keys in accordance with a specified cryptographic
key destruction method [assignment:
• For plaintext keys in volatile storage, the destruction shall be executed by a single overwrite
consisting of zeroes.
• For plaintext keys in non-volatile storage, the destruction shall be executed by the invocation of
an interface provided by a part of the TSF that logically addresses the storage location of the key
and performs a single, overwrite consisting of a new value of the key.]
that meets the following: [assignment: No standard].
6.1.2.4 FCS_COP.1/DataEncryption
FCS_COP.1.1/DATAENCRYPTION The TSF shall perform [assignment: encryption/decryption] in
accordance with a specified cryptographic algorithm [assignment: AES used in GCM mode] and
cryptographic key sizes [assignment: 128 bits, 256 bits] that meet the following: [assignment: AES as
specified in ISO 18033-3, GCM as specified in ISO 19772]
Application Note
The compliance to ISO/IEC 18033-3 is limited to section 5.2
Application Note
The compliance to ISO/IEC 19772 is limited to Annex A, section A.8.
6.1.2.5 FCS_COP.1/SigGen
FCS_COP.1.1/SIGGEN The TSF shall perform [assignment: cryptographic signature services
(generation and verification)] in accordance with a specified cryptographic algorithm [assignment:
RSA Digital Signature Algorithm and Elliptic Curve Digital Signature Algorithm] and cryptographic
key sizes [assignment: 3072 bits, 4096 bits (RSA) and 256, 384 and 521(ECDSA)] that meet the
following: [assignment: For RSA schemes: FIPS PUB 186-4, “Digital Signature Standard (DSS)”,
Section 5.5, using PKCS #1 v2.1 Signature Schemes RSASSA-PSS and/or RSASSA-PKCS1v1_5; ISO/IEC
9796-2, Digital signature scheme 2 or Digital Signature scheme 3 (RSA) and For ECDSA schemes: FIPS
PUB 186-4, “Digital Signature Standard (DSS)”, Section 6 and Appendix D, Implementing “NIST
curves” P-256, P-384, P-521; ISO/IEC 14888-3, Section 6.4 ]].
Application Note
The compliance to ISO/IEC 9796-2 is limited to:
• Digital Signature Scheme 2 (section 9 of the standard).
• Digital Signature Scheme 3 (section 10 of the standard).
6.1.2.6 FCS_COP.1/Hash
FCS_COP.1.1/HASH The TSF shall perform [assignment: cryptographic hashing services] in
accordance with a specified cryptographic algorithm [assignment: SHA-256, SHA-384, SHA-512] and
cryptographic key message digest sizes [assignment: 256, 384, 512] bits that meet the following:
[assignment: ISO/IEC 10118-3:2004].
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Application Note
The compliance to ISO/IEC 10118-3:2004 is limited to:
• Section 10 Dedicated Hash-Function 4, which defines SHA-256.
• Section 12 Dedicated Hash-Function 6, which defines SHA-384.
Where SHA512 is only used for RSA-based public key authentication
6.1.2.7 FCS_COP.1/KeyedHash
FCS_COP.1.1/KEYEDHASH The TSF shall perform [assignment: keyed-hash message authentication]
in accordance with a specified cryptographic algorithm [assignment: HMAC-SHA-256, HMAC-
SHA384] and cryptographic key sizes [assignment: 256, 384 bits] and message digest sizes 256 and
384 bits that meet the following: [assignment: ISO/IEC 9797-2:2011, Section 7 “MAC Algorithm 2”].
Application Note
The compliance to ISO/IEC 9797-2 2011, Section 7 is limited to the definition of the algorithm HMAC-
SHA-256, HMAC-SHA-384.
6.1.2.8 FCS_RBG_EXT.1: Random Bit Generation
FCS_RBG_EXT.1.1 The TSF shall perform all deterministic random bit generation services in
accordance with ISO/IEC 18031:2011 using [selection: Hash_DRBG (any)]
FCS_RBG_EXT.1.2 The deterministic RBG shall be seeded by at least one entropy source that
accumulates entropy from [selection: [assignment: 1] platform-based noise source] with a minimum
of [selection: 256 bits] of entropy at least equal to the greatest security strength, according to ISO/IEC
18031:2011 Table C.1 “Security Strength Table for Hash Functions”, of the keys and hashes that it will
generate.
Application Note
The compliance to ISO/IEC 18031:2011 is limited to:
• Section 7.2 Deterministic Random Bit Generator.
• Section 9. Overview and requirements for a deterministic random bit generator.
• C.2.1 Hash-function DRBG(Hash_DRBG)
6.1.2.9 FCS_SSHS_EXT.1: SSH Server Protocol
FCS_SSHS_EXT.1.1 The TSF shall implement the SSH protocol that complies with RFCs 4251, 4252,
4253, 4254, [selection: 4256, 4344, 5647, 5656, 6668, 8268, 8332].
Application Note
The compliance to the RFC 4251 affecting the evaluated configuration includes only the general
architecture of the SSH protocol, i.e. transport, confidentiality, data integrity, key exchange and
authentication.
Application Note
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The compliance to the RFC 4252 is limited to public-key based and password-based authentication (as
per FCS_SSHS_EXT.1.2).
Application Note
The parts of the RFC 4253 that are relevant to the scope of the TSF in terms of evaluated configuration
are the following:
• Maximum packet length (as per FCS_SSHS_EXT.1.3)
• Encryption algorithms used during transport (as per FCS_SSHS_EXT.1.4)
• Supported public-key based authentication algorithms (as per FCS_SSHS_EXT.1.5).
• Transport data integrity algorithms (as per FCS_SSHS_EXT.1.6).
• Key exchange methods (as per FCS_SSHS_EXT.1.7).
• Session re-key requirements (as per FCS_SSHS_EXT.1.8).
FCS_SSHS_EXT.1.2 The TSF shall ensure that the SSH protocol implementation supports the following
authentication methods as described in RFC 4252: public key-based, [selection: password-based]
FCS_SSHS_EXT.1.3 The TSF shall ensure that, as described in RFC 4253, packets greater than
[assignment: 262144] bytes in an SSH transport connection are dropped.
FCS_SSHS_EXT.1.4 The TSF shall ensure that the SSH transport implementation uses the following
encryption algorithms and rejects all other encryption algorithms: [selection: AEAD_AES_128_GCM,
AEAD_AES_256_GCM]
FCS_SSHS_EXT.1.5 The TSF shall ensure that the SSH public-key based authentication implementation
uses [selection: rsa-sha2-256, rsa-sha2-512, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384 and ecdsa-
sha2-nistp521] as its public key algorithm(s) and rejects all other public key algorithms.
FCS_SSHS_EXT.1.6 The TSF shall ensure that the SSH transport implementation uses [selection:
implicit] as its MAC algorithm(s) and rejects all other MAC algorithm(s).
FCS_SSHS_EXT.1.7 The TSF shall ensure that [selection: ecdh-sha2-nistp256] and [selection: ecdh-
sha2-nistp384, ecdh-sha2-nistp521] are the only allowed key exchange methods used for the SSH
protocol.
FCS_SSHS_EXT.1.8 The TSF shall ensure that within SSH connections the same session keys are used
for a threshold of no longer than one hour, and no more than one gigabyte of transmitted data. After
either of the thresholds are reached a rekey needs to be performed
6.1.2.10 FCS_TLSC_EXT.1: TLS Client Protocol
FCS_TLSC_EXT.1.1 The TSF shall implement [selection: TLS 1.2 (RFC 5246)] and reject all other TLS and
SSL versions. The TLS implementation will support the following ciphersuites [selection:
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289]
Application Note
The compliance of the TSF with RFC 5246 in terms of evaluated configuration includes support of only
the ciphersuites defined in FCS_TLSC_EXT.1.1. The compliance with this RFC is also limited by the TSF
defined in FCS_TLSC_EXT.1.2, FCS_TLSC.1.3 and FCS_TLSC.1.4.
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Application Note
The compliance to the RFC 5288 is limited to the ciphersuites supported by the TOE. The ciphersuites
included in the evaluated configuration are limited by FCS_TLSC_EXT.1.1.
FCS_TLSC_EXT.1.2 The TSF shall verify that the presented identifier matches [selection: the reference
identifier per RFC 6125 section 6].
Application Note
The reference identifier is established by the user and by an application (a parameter of an API). Based
on a singular reference identifier’s source domain and application service type, the client establishes
all reference identifiers including a Common Name for the Subject Name field of the certificate and a
(case-insensitive) DNS name, URI name, and Service Name for the Subject Alternative Name field. The
client then compares this list of all acceptable reference identifiers to the presented identifiers in the
TLS server’s certificate.
FCS_TLSC_EXT.1.3 When establishing a trusted channel, by default the TSF shall not establish a
trusted channel if the server certificate is invalid. The TSF shall also [selection: Not implement any
administrator override mechanism]
FCS_TLSC_EXT.1.4 The TSF shall [selection: present the Supported Elliptic Curves/Supported Groups
Extension with the following curves/groups: [selection: secp256r1, secp384r1, secp521r1]] in the
Client Hello.
Application Note
The ciphersuites with elliptic curves were not selected in FCS_TLSC_EXT.1.1. The TSF doesn’t support
this ciphersuite.
6.1.3 FIA: Identification and authentication
6.1.3.1 FIA_AFL.1: Authentication failure handling
management
FIA_AFL.1.1 The TSF shall detect when an Administrator configurable positive integer within
[assignment: 3 to 5]] unsuccessful authentication attempts occur related to [assignment:
Administrators attempting to authenticate remotely using a password].
FIA_AFL.1.2 When the defined number of unsuccessful authentication attempts has been [selection:
met], the TSF shall [assignment: prevent the offending Administrator from successfully establishing
a remote session using any authentication method that involves a password until an Administrator
defined time period has elapsed].
6.1.3.2 FIA_UAU.7: Protected authentication feedback
FIA_UAU.7.1 The TSF shall provide only [assignment: obscured feedback] to the administrative user
while the authentication is in progress at the local console.
6.1.3.3 FIA_PMG_EXT.1: Password Management
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FIA_PMG_EXT.1.1 The TSF shall provide the following password management capabilities for
administrative passwords:
a) Passwords shall be able to be composed of any combination of upper and lower case letters,
numbers, and the following special characters: [selection: “!”, “@”, “#”, “$”, “%”, “^”, “&”, “*”,
“(“, “),[assignment:”, “-“, “+”, “=”, “[“, “]”, “{“, “}”, “|”, “\”, “,”, “.”, “/”, “<”, “>”, “;”, “’”, “:”,
“””]]
b) Minimum password length shall be configurable to between [assignment: 8] and [assignment:
128] characters.
6.1.3.4 FIA_UIA_EXT.1: User Identification and
Authentication
FIA_UIA_EXT.1.1 The TSF shall allow the following actions prior to requiring the non-TOE entity to
initiate the identification and authentication process:
a) Display the warning banner in accordance with FTA_TAB.1
b) [selection: no other actions]
FIA_UIA_EXT.1.2 The TSF shall require each administrative user to be successfully identified and
authenticated before allowing any other TSF-mediated actions on behalf of that administrative user.
Application Note
Only a banner will show to the user or IT entity and no services are available before authentication.
6.1.3.5 FIA_X509_EXT.1/Rev: X.509 Certificate Validation
FIA_X509_EXT.1.1/Rev The TSF shall validate certificates in accordance with the following rules:
• RFC 5280 certificate validation and certification path validation supporting a minimum path
length of three certificates.
• The certification path must terminate with a trusted CA certificate designated as a trust anchor.
• The TSF shall validate a certification path by ensuring that all CA certificates in the certification
path contain the basicConstraints extension with the CA flag set to TRUE.
• The TSF shall validate the revocation status of the certificate using [selection: a Certificate
Revocation List (CRL) as specified in RFC 5280 Section 6.3]
• The TSF shall validate the extendedKeyUsage field according to the following rules:
• Certificates used for trusted updates and executable code integrity verification shall have the
Code Signing purpose (id-kp 3 with OID 1.3.6.1.5.5.7.3.3) in the extendedKeyUsage field.
• Server certificates presented for TLS shall have the Server Authentication purpose (id-kp 1
with OID 1.3.6.1.5.5.7.3.1) in the extendedKeyUsage field.
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• Client certificates presented for TLS shall have the Client Authentication purpose (id-kp 2 with
OID 1.3.6.1.5.5.7.3.2) in the extendedKeyUsage field.
• OCSP certificates presented for OCSP responses shall have the OCSP Signing purpose (id-kp
9 with OID 1.3.6.1.5.5.7.3.9) in the extendedKeyUsage field.
Application Note
The aspects of the RFC 5280 that are relevant to the TSF are the following:
• Validation of trusted certification chain.
• Verification of fail in validation of incomplete certificate chain.
• Handling of revoked certificates.
• Revocation of peer certificates and peer intermediate certificates.
• Validation of the KeyUsage cRLSign field when employing CRLs.
FIA_X509_EXT.1.2/Rev The TSF shall only treat a certificate as a CA certificate if the basicConstraints
extension is present and the CA flag is set to TRUE.
Application Note
Revocation status is verified using CRLs. TLS requires that certificates are used and this use requires
that the extendedKeyUsage rules are verified. The validation is expected to end in a trusted root CA
certificate in a root store managed by the platform. The certificate path must end in a trusted root CA
certificate otherwise it will be judged invalid.
6.1.3.6 FIA_X509_EXT.2: X509 Certificate Authentication
FIA_X509_EXT.2.1 The TSF shall use X.509v3 certificates as defined by RFC 5280 to support
authentication for [selection: TLS] , and [selection: no additional uses ]
FIA_X509_EXT.2.2 When the TSF cannot establish a connection to determine the validity of a
certificate, the TSF shall [selection: not accept the certificate]
6.1.3.7 FIA_UAU_EXT.2: Password-based Authentication
Mechanism
FIA_UAU_EXT.2.1 The TSF shall provide a local [selection: password-based] authentication
mechanism to perform local administrative user authentication.
6.1.4 FMT: Security management
6.1.4.1 FMT_MOF.1/ManualUpdate: Management of
security functions behaviour
FMT_MOF.1.1/MANUALUPDATE The TSF shall restrict the ability to [selection: enable] the functions
[assignment: to perform manual updates] to [assignment: Security Administrators].
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6.1.4.2 FMT_MOF.1/Functions: Management of security
functions behaviour
FMT_MOF.1.1/FUNCTIONS The TSF shall restrict the ability to [selection: determine the behaviour
of] the functions [assignment: transmission of audit data to an external IT entity] to [assignment:
Security Administrators].
6.1.4.3 FMT_MOF.1/Services: Management of security
functions behaviour
FMT_MOF.1.1/SERVICES The TSF shall restrict the ability to [selection: disable, enable] the functions
services [assignment: Start and stop] to [assignment: Security Administrators].
Application Note
The following security services can be enabled and disabled by Security Administrators: SSH, TLS, NTP
and SYSLOG.
6.1.4.4 FMT_MTD.1/CoreData: Management of TSF data
FMT_MTD.1.1/COREDATA The TSF shall restrict the ability to [selection: [assignment: manage]] the
[assignment: TSF data] to [assignment: Security Administrators].
Application note
Where TSF data refers to audit data, TSFIs-related configuration data and user data. The word
‘manage’ includes but is not limited to create, initialize, view, change default, modify, delete, clear,
and append. This SFR includes also the resetting of user passwords by the Security Administrator. The
identifier ‘CoreData’ has been added here to separate this iteration of FMT_MTD.1 from
FMT_MTD.1/CryptoKeys.
6.1.4.5 FMT_MTD.1/CryptoKeys: Management of TSF data
FMT_MTD.1.1/CRYPTOKEYS The TSF shall restrict the ability to [selection: [assignment: manage]]
the [assignment: cryptographic keys] to [assignment: Security Administrators].
6.1.4.6 FMT_SMF.1: Specification of Management
Functions
FMT_SMF.1.1 The TSF shall be capable of performing the following management functions:
[assignment: - Ability to administer the TOE locally and remotely;
- Ability to configure the access banner;
- Ability to configure the session inactivity time before session termination or locking;
- Ability to manually update the TOE, and to verify the updates using digital signature capability
prior to installing those updates;
- Ability to configure the authentication failure parameters for FIA_AFL.1;
- Ability to start and stop services (SSH, TLS, NTP and SYSLOG)
- Ability to configure audit behavior (e.g. changes to storage locations for audit; changes to
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behavior when local audit storage space is full);
- Ability to modify the behavior of the transmission of audit data to an external IT entity;
- Ability to manage the cryptographic keys;
- Ability to configure thresholds for SSH rekeying
- Ability to re-enable an Administrator account;
- Ability to configure NTP;
- Ability to manage the TOE's trust store and designate X.509.v3 certificates as trust anchors;
- Ability to import X.509v3 certificates to the TOE's trust store].
6.1.4.7 FMT_SMR.2: Restrictions on security roles
FMT_SMR.2.1 The TSF shall maintain the roles: [assignment: Security Administrator].
FMT_SMR.2.2 The TSF shall be able to associate users with roles.
FMT_SMR.2.3 The TSF shall ensure that the conditions [assignment: The Security Administrator role
shall be able to administer the TOE locally; The Security Administrator role shall be able to
administer the TOE remotely] are satisfied.
6.1.5 FTA: TOE access
6.1.5.1 FTA_SSL.3: TSF-initiated termination
FTA_SSL.3.1 The TSF shall terminate an a remote interactive session after a [assignment: Security
Administrator-configurable time interval of session inactivity].
6.1.5.2 FTA_SSL.4: User-initiated termination
FTA_SSL.4.1 The TSF shall allow user-initiated Administrator-initiated termination of the user's
Administrator's own interactive session.
6.1.5.3 FTA_TAB.1: Default TOE access banners
FTA_TAB.1.1 Before establishing a an administrative user session the TSF shall display a Security
Administrator-specified advisory notice and consent warning message regarding unauthorised use
of the TOE.
6.1.5.4 FTA_SSL_EXT.1: TSF-initiated Session Locking
FTA_SSL_EXT.1.1 The TSF shall, for local interactive sessions [selection: terminate the session] after
a Security Administrator-specified time period of inactivity.
6.1.6 FTP: Trusted path/channels
6.1.6.1 FTP_ITC.1: Inter-TSF trusted channel
FTP_ITC.1.1 The TSF shall be capable of using TLS to provide a communication channel between itself
and another trusted authorized IT product entities supporting the following capabilities: audit
server; that is logically distinct from other communication channels and provides assured
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identification of its end points and protection of the channel data from disclosure and detection of
modification or disclosure. of the channel data.
FTP_ITC.1.2 The TSF shall permit [selection: the TSF or the authorized IT entities] to initiate
communication via the trusted channel.
FTP_ITC.1.3 The TSF shall initiate communication via the trusted channel for [assignment: audit
service].
6.1.6.2 FTP_TRP.1: Trusted path
FTP_TRP.1.1 The TSF shall be capable of using SSH to provide a communication path between itself
and authorized [selection: remote] users administrators that is logically distinct from other
communication paths and provides assured identification of its end points and protection of the
communicated data from [selection: [assignment: disclosure and provides detection of modification
of the channel data]].
FTP_TRP.1.2 The TSF shall permit [selection: remote administrators] to initiate communication via
the trusted path.
FTP_TRP.1.3 The TSF shall require the use of the trusted path for [selection: [assignment: initial
administrator authentication and all remote administration actions]].
6.1.7 FPT: Protection of the TSF
6.1.7.1 FPT_SKP_EXT.1: Protection of TSF Data (for reading
of all pre-shared, symmetric and private keys)
FPT_SKP_EXT.1.1 The TSF shall prevent reading of all pre-shared keys, symmetric keys, and private
keys.
Application Note
The intent of this requirement is for the device to protect keys, key material, and authentication
credentials from unauthorized disclosure. This data should only be accessed for the purposes of their
assigned security functionality, and there is no need for them to be displayed/accessed at any other
time. This requirement does not prevent the device from providing indication that these exist, are in
use, or are still valid. It does, however, restrict the reading of the values outright.
6.1.7.2 FPT_APW_EXT.1: Protection of Administrator
Passwords
FPT_APW_EXT.1.1 The TSF shall store passwords in non-plaintext form.
FPT_APW_EXT.1.2 The TSF shall prevent the reading of plaintext passwords.
Application Note
The intent of the requirement is that raw password authentication data of Security Administrators is
not stored in the clear, and that no user or Administrator is able to read the plaintext password of a
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Security Administrator through “normal” interfaces. An all-powerful Administrator could directly read
memory to capture a password but is trusted not to do so.
6.1.7.3 FPT_TST_EXT.1: TSF Testing
FPT_TST_EXT.1.1 The TSF shall run a suite of the following self-tests [selection: during initial start-up
(on power on)] to demonstrate the correct operation of the TSF: [assignment: integrity of the
firmware and software (software digital signature), the correct operation of cryptographic
functions]
6.1.7.4 FPT_TUD_EXT.1: Trusted Update
FPT_TUD_EXT.1.1 The TSF shall provide [assignment: Security Administrators] the ability to query
the currently executing version of the TOE firmware/software and [selection: the most recently
installed version of the TOE firmware/software]
FPT_TUD_EXT.1.2 The TSF shall provide [assignment: Security Administrators] the ability to manually
initiate updates to TOE firmware/software and [selection: no other update mechanism]
FPT_TUD_EXT.1.3 The TSF shall provide means to authenticate firmware/software updates to the TOE
using a [selection: digital signature mechanism] prior to installing those updates.
Application Note
“Update” in the context of this SFR refers to the process of replacing a non-volatile (NV), system
resident software component with another. The former is referred to as the NV image, and the latter
is the update image. While the update image is typically newer than the NV image, this is not a
requirement. There are legitimate cases where the system owner may want to rollback a component
to an older version (e.g., when the component manufacturer releases a faulty update, or when the
system relies on an undocumented feature no longer present in the update). Likewise, the owner may
want to update with the same version as the NV image to recover from faulty storage.
6.1.7.5 FPT_STM_EXT.1: Reliable Time Stamps
FPT_STM_EXT.1.1 The TSF shall be able to provide reliable time stamps for its own use.
FPT_STM_EXT.1.2 The TSF shall [selection: synchronize time with an NTP server].
Application Note
In case of supporting NTP server communication, [CPP_ND] forces to claim FCS_NTP_EXT.1. However,
as stated at chapter 2 Conformance Claims, this ST does not claim strict conformance with any
Protection Profile; therefore, the mentioned SFR is not included.
6.2 Security Assurance Requirements
The development and the evaluation of the TOE shall be done in accordance to the following security
assurance requirements: EAL4 + ALC_FLR.2
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The following table shows the assurance requirements by reference the individual components in
[CC31R5P3]
Assurance Class Assurance Components
ASE: Security Target evaluation
ASE_CCL.1: Conformance claims
ASE_ECD.1: Extended components definition
ASE_INT.1: ST introduction
ASE_TSS.1: TOE summary specification
ASE_OBJ.2: Security objectives
ASE_REQ.2: Derived security requirements
ASE_SPD.1: Security problem definition
ALC: Life-cycle support
ALC_CMC.4: Production support, acceptance procedures and
automation
ALC_CMS.4: Problem tracking CM coverage
ALC_DEL.1: Delivery procedures
ALC_DVS.1: Identification of security measures
ALC_LCD.1: Developer defined life-cycle model
ALC_TAT.1: Well-defined development tools
ALC_FLR.2: Flaw reporting procedures
ADV: Development
ADV_ARC.1: Security architecture description
ADV_FSP.4: Complete functional specification
ADV_IMP.1: Implementation representation of the TSF
ADV_TDS.3: Basic modular design
AGD: Guidance documents
AGD_OPE.1: Operational user guidance
AGD_PRE.1: Preparative procedures
ATE: Tests
ATE_COV.2: Analysis of coverage
ATE_DPT.1: Testing: basic design
ATE_FUN.1: Functional testing
ATE_IND.2: Independent testing - sample
AVA: Vulnerability assessment AVA_VAN.3: Focused vulnerability analysis
Table 9 Security Assurance Requirements
6.3 Security Requirements Rationale
6.3.1 Necessity and sufficiency analysis
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SFR / TOE Security Objective
O.ADMIN_AUTH
O.STRONG_CRYPTO
O.TRUSTED_COMM
O.STRONG_AUTHENTICATION_ENDPOINT
O.SECURE_UPDATES
O.ACTIVITY_AUDIT
O.CRYPTO_KEY_PROTECTION
O.PASSWORD_PROTECTION
O.SELF_TEST
O.BANNER
FAU_GEN.1 X
FAU_GEN.2 X
FAU_STG_EXT.1 X
FAU_ STG_EXT.3 X
FAU_STG.1 X
FCS_CKM.1 X
FCS_CKM.2 X
FCS_CKM.4 X
FCS_COP.1/DataEncryption X
FCS_COP.1/SigGen X
FCS_COP.1/Hash X
FCS_COP.1/KeyedHash X
FCS_SSHS_EXT.1 X
FIA_AFL.1 X
FIA_PMG_EXT.1 X
FIA_UIA_EXT.1 X
FIA_UAU_EXT.2 X
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SFR / TOE Security Objective
O.ADMIN_AUTH
O.STRONG_CRYPTO
O.TRUSTED_COMM
O.STRONG_AUTHENTICATION_ENDPOINT
O.SECURE_UPDATES
O.ACTIVITY_AUDIT
O.CRYPTO_KEY_PROTECTION
O.PASSWORD_PROTECTION
O.SELF_TEST
O.BANNER
FIA_UAU.7 X
FIA_X509_EXT.1/Rev X X
FIA_X509_EXT.2 X X
FMT_MOF.1/ManualUpdate X
FMT_MOF.1/Functions X X
FMT_MOF.1/Services X
FMT_MTD.1/CoreData X
FMT_MTD.1/CryptoKeys X
FMT_SMF.1 X X X X X
FMT_SMR.2 X
FPT_SKP_EXT.1 X
FPT_APW_EXT.1 X
FPT_TUD_EXT.1 X
FPT_STM_EXT.1 X
FTA_SSL_EXT.1 X
FTA_SSL.3 X
FTA_SSL.4 X
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SFR / TOE Security Objective
O.ADMIN_AUTH
O.STRONG_CRYPTO
O.TRUSTED_COMM
O.STRONG_AUTHENTICATION_ENDPOINT
O.SECURE_UPDATES
O.ACTIVITY_AUDIT
O.CRYPTO_KEY_PROTECTION
O.PASSWORD_PROTECTION
O.SELF_TEST
O.BANNER
FTA_TAB.1 X X
FTP_ITC.1 X X
FTP_TRP.1 X X X
FCS_RBG_EXT.1 X
FPT_TST_EXT.1 X
FCS_TLSC_EXT.1 X
Table 10 SFRs / TOE Security Objectives coverage
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6.3.2 Security Requirement Sufficiency
O.ADMIN_AUTH: The Administrator role is defined in FMT_SMR.2 and along with FMT_SMF.1, they
support this security objective by defining the TOE management capabilities available to
administrators.
FMT_MTD.1/CoreData restricts the ability to manage the TSF to security administrators.
FMT_MOF.1/Functions restricts the ability to determine the feature of the transmission of audit data
to an external IT entity. On the other hand, FMT_MOF.1/Services restricts the ability to disable or
enable the services of the TOE to the security administrators.
FIA_UIA_EXT.1 supports this security objective by preventing any action before the identification and
authentication process. FTA_TAB.1 supports this security objective by showing an advisory notice and
consent warning message is the only action allowed before the identification and authentication
process occurs.
The administrators’ authentication process is defined in FIA_UAU_EXT.2 and consists on providing a
local password-based authentication mechanism to perform local administrative user authentication.
This security objective is intended to perform the closure of authentication sessions after a defined
period of inactivity. FTA_SSL_EXT.1 ensures this feature for local sessions, FTA_SSL.4 for all interactive
sessions, and by FTA_SSL.3 for remote sessions.
Another goal of this security objective is that the authentication of the TOE using passwords was
through a secure communication channel. This task is covered by FTP_TRP.1.
O.STRONG_CRYPTO: This security objective is supported by the following security requirements, that
provide use of robust cryptographic algorithms, compliant to industry approved standards:
- Requirements for key generation and key establishment are set in FCS_CKM.1 and FCS_CKM.2,
respectively.
- Requirements for use of cryptographic schemes are set in FCS_COP.1/DataEncryption,
FCS_COP.1/SigGen, FCS_COP.1/Hash, and FCS_COP.1/KeyedHash.
- Requirements for random bit generation to support key generation and secure protocols are set in
FCS_RBG_EXT.1.
- FMT_SMF.1 is intended to establish the management of cryptographic functions by a security
administrator.
O.TRUSTED_COMM: This security objective is intended to implement secure channels that use
standardized tunneling protocols to protect the critical network traffic. The following security
requirements support this security objective:
- FTP_ITC.1 supports this security objective by providing a communication channel between itself and
authorized IT entities by using the TLS protocol. FTP_TRP.1 is able to provide this channel by using
SSH.
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- FCS_SSHS_EXT.1 and FCS_TLSC_EXT.1 support this security objective for the use of secure
communication protocols by using SSH Client, SSH Server Protocol, and TLS Client Protocols.
- Requirements for the use of public-key certificates to support secure protocols are supported by
FIA_X509_EXT.1/Rev, FIA_X509_EXT.2.
All the above-mentioned security requirements support this security objective by providing
communication security in terms of confidentiality, integrity, and protection.
O.STRONG_AUTHENTICATION_ENDPOINT: FTP_ITC.1 and FTP_TRP.1 support this security objective
by providing assured identification of its endpoints (using TLS and SSH respectively) and protection of
the channel data from disclosure and detection of modification of the channel data.
O.SECURE_UPDATES: FPT_TUD_EXT.1 supports this security objective by allowing administrators to
query the current TOE version of the TOE firmware/software and manually initiate the installation of
updates, that need to be authenticated using digital signature before installing.
FIA_X509_EXT.1/Rev and FIA_X509_EXT.2 support this security objective by defining a set of rules to
validate the authenticity of the certificate using secure and robust cryptographic algorithms.
FMT_SMF.1 supports this security objective by providing a set of management functions, which
includes the ability to update the TOE and to verify the updates using digital signature capabilities.
FMT_MOF.1/ManualUpdate likewise supports this security objective by restricting the ability of this
feature to security administrators.
O.ACTIVITY_AUDIT: FAU_GEN.1 supports this security objective by generating audit records of a set
of auditable events. Each audit event will be marked with precise timestamps, associated subject
identity, and the outcome (success or failure) of the event. FAU_GEN.2 supports this security
objective by providing a relationship between the audit event and the identity of the user that causes
the event. FPT_STM_EXT.1 is intended to provide reliable time stamps for the own TOE’s use.
FAU_STG.1 supports this security target by protecting the stored audit records from unauthorized
deletion. This security requirement is also intended to prevent unauthorized modifications to the
stored audit records in the audit trail.
FAU_STG_EXT.1 is intended to provide the ability to transmit the generated audit data to an external
IT entity using a trusted channel by using secure communication protocols. This security requirement
also provides a mechanism to overwrite the oldest log information always when the local storage
space for audit data is full.
FAU_ STG_EXT.3 provides a mechanism to generate a warning to inform the TOE’s administrator if
the audit trail exceeds the local audit trail storage capacity. This mechanism is intended to deal with
the potential loss of locally stored audit records.
FMT_SMF.1 supports this security objective by providing a set of management functions, which
includes the ability to configure audit behavior.
FMT_MOF.1/Functions likewise supports this security objective by restricting the ability to enable the
transmission of audit data to an external IT entity to a security administrator.
O.CRYPTO_KEY_PROTECTION: FPT_SKP_EXT.1 supports the protection of secret/private keys against
compromise.
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FCS_CKM.4 provides a mechanism to perform the key’s destruction in a secure way that prevents key
recovery from residual information.
FMT_SMF.1 supports this security objective by providing a set of management functions, which
includes the ability to configure thresholds for SSH rekeying. FMT_MTD.1/CryptoKeys is intended to
restrict the ability to manage cryptographic keys to security administrators.
O.PASSWORD_PROTECTION: FIA_PMG_EXT.1 supports this security objective by providing the ability
to establish password management capabilities based on password complexity (composed of any
combination of upper and lower case letters numbers, and special characters) and minimum
password length restriction.
Protection of password entry by providing obscured feedback is specified in FIA_UAU.7
FIA_AFL.1 supports this security objective by providing the ability to detect unsuccessful
authentication attempts when administrators are attempting to authenticate remotely. This security
requirement meets this security objective by locking the authentication of the user, which reaches
the defined number of authentication attempts established.
FPT_APW_EXT.1 prevents the plaintext storage of passwords. Therefore, this security requirement
also prevents the reading of plaintext passwords.
O.SELF_TEST: FPT_TST_EXT.1 provides the necessary mechanisms to support this security objective
by run a suite of tests during the initial start-up of the TOE to demonstrate its correct operation.
O.BANNER: This security objective is supported by FTA_TAB.1 which requires that the TOE
displays an advisory notice and consent about the use of the TOE to administrators before establishing
an administrative user session.
6.3.3 SFR Dependency Rationale
6.3.3.1 Table of SFR dependencies
The following table lists the dependencies for each requirement, indicating how they have been
satisfied. The abbreviation "h.a." indicates that the dependency has been satisfied by a SFR that is
hierarchically above the required dependency.
SFR Required Fulfilled Missing
FAU_GEN.1 FPT_STM.1 None None
FAU_GEN.2 FAU_GEN.1, FIA_UID.1 FAU_GEN.1 None
FAU_STG_EXT.1 FAU_GEN.1, FTP_ITC.1 FAU_GEN.1, FTP_ITC.1 None
FAU_ STG_EXT.3
FAU_GEN.1
FAU_STG_EXT.1
FAU_GEN.1
FAU_STG_EXT.1
None
FAU_STG.1 FAU_GEN.1 FAU_GEN.1 None
FCS_CKM.1
FCS_CKM.4, [FCS_CKM.2 or
FCS_COP.1]
FCS_CKM.4, FCS_CKM.2
and FCS_COP.1/SigGen
None
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SFR Required Fulfilled Missing
FCS_CKM.2
FCS_CKM.4, [FDP_ITC.1 or
FDP_ITC.2 or FCS_CKM.1]
FCS_CKM.4, FCS_CKM.1 None
FCS_CKM.4
[FDP_ITC.1 or FDP_ITC.2 or
FCS_CKM.1]
FCS_CKM.1 None
FCS_COP.1/DataEncryption
FCS_CKM.4, [FDP_ITC.1 or
FDP_ITC.2 or FCS_CKM.1]
FCS_CKM.4
FCS_CKM.
1
FCS_COP.1/SigGen
FCS_CKM.4, [FDP_ITC.1 or
FDP_ITC.2 or FCS_CKM.1]
FCS_CKM.4, FCS_CKM.1 None
FCS_COP.1/Hash
FCS_CKM.4, [FDP_ITC.1 or
FDP_ITC.2 or FCS_CKM.1]
None
FCS_CKM.
4 and
FCS_CKM.
1
FCS_COP.1/KeyedHash
FCS_CKM.4, [FDP_ITC.1 or
FDP_ITC.2 or FCS_CKM.1]
FCS_CKM.4
FCS_CKM.
1
FCS_SSHS_EXT.1
FCS_CKM.1, FCS_CKM.2,
FCS_COP.1/DataEncryption
, FCS_COP.1/SigGen,
FCS_COP.1/Hash,
FCS_COP.1/KeyedHash,
FCS_RBG_EXT.1
FCS_CKM.1, FCS_CKM.2,
FCS_COP.1/DataEncryption
, FCS_COP.1/SigGen,
FCS_COP.1/Hash,
FCS_COP.1/KeyedHash,
FCS_RBG_EXT.1
None
FIA_AFL.1 FIA_UAU.1 FIA_UIA_EXT.1 None
FIA_PMG_EXT.1 None None None
FIA_UIA_EXT.1 FTA_TAB.1 FTA_TAB.1 None
FIA_UAU_EXT.2 None None None
FIA_UAU.7 FIA_UAU.1 FIA_UIA_EXT.1 None
FIA_X509_EXT.1/Rev FIA_X509_EXT.2 FIA_X509_EXT.2 None
FIA_X509_EXT.2 FIA_X509_EXT.1 FIA_X509_EXT.1/Rev None
FMT_MOF.1/ManualUpdat
e
FMT_SMR.1, FMT_SMF.1
FMT_SMR.2 (h.a.
FMT_SMR.1), FMT_SMF.1
None
FMT_MOF.1/Functions FMT_SMR.1, FMT_SMF.1
FMT_SMR.2 (h.a.
FMT_SMR.1), FMT_SMF.1
None
FMT_MOF.1/Services FMT_SMR.1, FMT_SMF.1
FMT_SMR.2 (h.a.
FMT_SMR.1), FMT_SMF.1
None
FMT_MTD.1/CoreData FMT_SMR.1, FMT_SMF.1
FMT_SMR.2 (h.a.
FMT_SMR.1), FMT_SMF.1
None
FMT_MTD.1/CryptoKeys FMT_SMR.1, FMT_SMF.1
FMT_SMR.2 (h.a.
FMT_SMR.1), FMT_SMF.1
None
FMT_SMF.1 None None None
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SFR Required Fulfilled Missing
FMT_SMR.2 FIA_UID.1 FIA_UIA_EXT.1 None
FPT_SKP_EXT.1 None None None
FPT_APW_EXT.1 None None None
FPT_TUD_EXT.1
[FCS_COP.1/SigGen or
FCS_COP.1/Hash]
FCS_COP.1/SigGen None
FPT_STM_EXT.1 None None None
FTA_SSL_EXT.1 FIA_UAU.1 FIA_UIA_EXT.1 None
FTA_SSL.3 None None None
FTA_SSL.4 None None None
FTA_TAB.1 None None None
FTP_ITC.1 None None None
FTP_TRP.1 None None None
FCS_RBG_EXT.1 None None None
FPT_TST_EXT.1 None None None
FCS_TLSC_EXT.1
FCS_CKM.1, FCS_CKM.2,
FCS_COP.1/DataEncryption
, FCS_COP.1/SigGen,
FCS_COP.1/Hash,
FCS_COP.1/KeyedHash,
FCS_RBG_EXT.1
FCS_CKM.1, FCS_CKM.2,
FCS_COP.1/DataEncryption
, FCS_COP.1/SigGen,
FCS_COP.1/Hash,
FCS_COP.1/KeyedHash,
FCS_RBG_EXT.1
None
Table 11 SFR Dependencies
6.3.3.2 Justification for missing dependencies
FCS_COP.1/DataEncryption dependency on FCS_CKM.1
AES encryption uses a derived symmetrical key. This key is derived by Elliptic curve-based key
establishment schemes as stated at FCS_CKM.2 from the generated key from FCS_CKM.1. Because
that SFR provides the key used by AES encryption, FCS_CKM.1 is not required.
FCS_COP.1/Hash dependency on FCS_CKM.1 and FCS_CKM.4
Hashing functions do not use any keys to perform its functionality. Therefore, FCS_CKM.1 and
FCS_CKM.4 are not required.
FCS_COP.1/KeyedHash dependency on FCS_CKM.1
HMAC uses a derived symmetrical key. This key is derived by Elliptic curve-based key establishment
schemes as stated at FCS_CKM.2 from the generated key from FCS_CKM.1. Because that SFR provides
the key used by AES encryption, FCS_CKM.1 is not required.
6.3.4 SAR Rationale
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The TOE claims compliance to EAL4 level of assurance augmented by ALC_FLR.2. The assurance level
EAL4 indicates that the product is methodically designed, tested, and reviewed. The assurance
requirements for life cycle support have been augmented by ALC_FLR.2 (Basic flaw remediation) to
ensure that basic procedures used to track and correct security flaws for the TOE are in place and
documented. This is considered appropriate for attackers with Enhanced-Basic attack potential. The
rest of Security Assurance Requirements are chosen because of the evaluation level EAL4+.
6.3.5 SAR Dependency Rationale
6.3.5.1 Table of SAR dependencies
SAR Required Fulfilled Missing
ASE_CCL.1
ASE_INT.1, ASE_ECD.1,
ASE_REQ.1
ASE_INT.1, ASE_ECD.1,
ASE_REQ.2 (hierarchically
above ASE_REQ.1)
None
ASE_ECD.1 None None None
ASE_INT.1 None None None
ASE_OBJ.2 ASE_SPD.1 ASE_SPD.1 None
ASE_REQ.2 ASE_OBJ.2, ASE_ECD.1 ASE_OBJ.2, ASE_ECD.1 None
ASE_TSS.1
ASE_INT.1, ASE_REQ.1,
ADV_FSP.1
ASE_INT.1, ASE_REQ.2
(hierarchically above
ASE_REQ.1), ADV_FSP.4
(hierarchically above
ADV_FSP.1)
None
ALC_CMC.4
ALC_CMS.1, ALC_DVS.1,
ALC_LCD.1
ALC_CMS.4 (hierarchically
above ALC_CMS.1),
ALC_DVS.1, ALC_LCD.1
None
ALC_CMS.4 None None None
ADV_FSP.4 ADV_TDS.1
ADV_TDS.3 (hierarchically
above ADV_TDS.1)
None
AGD_OPE.1 ADV_FSP.1
ADV_FSP.4 (hierarchically
above ADV_FSP.1)
None
AGD_PRE.1 None None None
ATE_IND.2
ADV_FSP.2, AGD_OPE.1,
AGD_PRE.1, ATE_COV.1,
ATE_FUN.1
ADV_FSP.4 (hierarchically
above ADV_FSP.2),
AGD_OPE.1, AGD_PRE.1,
ATE_COV.2 (hierarchically
above ATE_COV.1),
ATE_FUN.1
None
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SAR Required Fulfilled Missing
AVA_VAN.3
ADV_ARC.1, ADV_FSP.4,
ADV_TDS.3, ADV_IMP.1,
AGD_OPE.1, AGD_PRE.1,
ATE_DPT.1
ADV_ARC.1, ADV_FSP.4,
ADV_TDS.3, ADV_IMP.1,
AGD_OPE.1, AGD_PRE.1,
ATE_DPT.1
None
ASE_SPD.1 None None None
ALC_DEL.1 None None None
ADV_ARC.1 ADV_FSP.1, ADV_TDS.1
ADV_FSP.4 (hierarchically
above ADV_FSP.1),
ADV_TDS.3 (hierarchically
above ADV_TDS.1)
None
ADV_IMP.1 ADV_TDS.3, ALC_TAT.1 ADV_TDS.3, ALC_TAT.1 None
ADV_TDS.3 ADV_FSP.4 ADV_FSP.4 None
ALC_DVS.1 None None None
ALC_LCD.1 None None None
ALC_TAT.1 ADV_IMP.1 ADV_IMP.1 None
ATE_COV.2 ADV_FSP.2, ATE_FUN.1
ADV_FSP.4 (hierarchically
above ADV_FSP.2),
ATE_FUN.1
None
ATE_DPT.1
ADV_ARC.1, ADV_TDS.2,
ATE_FUN.1
ADV_ARC.1, ADV_TDS.3
(hierarchically above
ADV_TDS.2), ATE_FUN.1
None
ATE_FUN.1 ATE_COV.1
ATE_COV.2 (hierarchically
above ATE_COV.1)
None
ALC_FLR.2 None None None
Table 12 SAR dependencies
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7 TOE Summary Specification
7.1 Security Audit
This section describes how the TOE meets each security functional requirement that belong to class
FAU (defined in [CC31R5P2]) and that is listed in Section 6 of this ST.
Audit data generation TSF is defined by FAU_GEN.1. The TOE meets this SFR as described below:
• The TOE generates an audit record whenever an audited event occurs. The types of events
that cause audit records to be generated include identification and authentication related
events, and administrative events (the specific events and the contents of each audit record
are listed in the table within the FAU_GEN.1 SFR, (in the table of auditable events presented
in the application note next to that SFR). Each of the events specified in the audit record is in
enough detail to identify the user for which the event is associated (e.g. user identity, MAC
address, IP address), when the event occurred, where the event occurred, the outcome of
the event, and the type of event that occurred.
• The audit trail consists of the individual audit records; one audit record for each event that
occurred. The audit record contains a lot of information, such as the type of event that
occurred, and two percent sign (%%), which follows the device name. As noted above, the
information includes at least all of the required information. Additional information can be
configured and included if desired.
• Administrators have the ability to execute CLI command to generate, import or delete
cryptographic keys, each command will generate a log and will be stored in log file (in the
hardware platform). Starting and stopping the referred service will generate a log for audit.
• Date and time of the event, type of event, subject identity, and the outcome of the event are
included in audit log.
TSF related to association of user identities to audit data is defined by FAU_GEN.2. The TOE meets
this SFR as follows: each auditable event is associated with the user that triggered the event and as a
result, they are traceable to a specific user. For example, a human user, user identity or related session
ID would be included in the audit record. For the IT entity or device where the authentication event
came from, the IP address, MAC address, host name, or other configured identification is presented.
The security log of user account management shall include user name.
Protection of audit trail storage TSF is defined by FAU_STG.1 which is met by the TOE as follows:
• Only the Security Administrators can monitor the logfile record, and operate the log files. The
unauthorized users have no access to do those actions. And the actions of the authorized
administrators will be logged.
• The Security Administrator cannot alter audit records but can delete audit information
records as a whole.
Protected audit event storage TSF is defined by FAU_STG_EXT.1 and the TOE meets this SFR as
described below:
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• The TOE supports to export syslog records to a specified, external syslog server. The TOE
protects communications with an external syslog server via TLS. The TOE stores audit records
on Internal flash (located in the non-TOE hardware platform) whenever it is connected with
syslog server or not. The transmission of audit information to an external syslog server can be
done in real-time.
• The size of an information file is configurable by the administrator with value
4M/8M/16M/32M bytes. The default maximum size of each information file is 8 MB. When
the size of an information file exceeds the configured maximum size, the information file is
compressed into a smaller file in standard log_slot ID_time.log.zip format. The maximum
quantity of compressed files is configurable by the administrator with a value ranging from 3
to 500. A maximum of 200 files can be stored on a device by default. The unauthorized users
are disallowed to handle the audit records.
• The logs are saved to flash memory (internal flash in the non-TOE platform) so records can’t
be lost in case of failures or restarts. The log buffer is circular, so newer messages overwrite
older messages after the buffer is full. Administrators are instructed to monitor the log buffer
using the “show logging privileged CLI” command to view the audit records. The first message
displayed is the newest message in the buffer. There are other associated commands to clear
the buffer, to reset log buffer, etc. The size of the log buffer can be configured by users with
sufficient privileges.
• When the local audit data store in internal flash exceeds the maximum allowed size of log file
storage, the system deletes oldest compressed files to save the latest log file.
• An administrator cannot alter audit records but can delete audit records as a whole.
TSF related to action in case of possible audit data loss is defined by FAU_ STG_EXT.3. The TOE meets
this SFR as follows:
• If the log files have already occupied more than 80% of the total audit storage in internal flash
(of the non-TOE hardware platform), or the oldest compressed files are deleted to save the
latest log file, an event will be generated and sent to management server to notice the clients
of the warning information.
• If the number of compressed log files generated in the system exceeded 90% of the maximum
number of compressed files, an event will also be generated to notice management server
the warning information.
• If the number of recorded compressed files reaches the maximum number that the security
administrator has configured, or the storage of audit events reaches the configured storage
size, another event will be generated to notice management server.
7.2 Cryptographic Support (FCS)
This section describes how the TOE meets each security functional requirement that belong to class
FCS (defined in [CC31R5P2]) and that is listed in Section 6 of this ST.
7.2.1 Cryptographic Key Management
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The TSF implements generation of cryptographic keys defined by FCS_CKM.1 and cryptographic key
establishment defined by FCS_CKM.2. In order to meet these SFRs, the TOE’s DRBG is used to
generate RSA keys with key sizes between 2048 to 4096 bits and ECC key pairs with 256, 384 and 521
curves used for ECDSA public key authentication. The generated keys are used for device
authentication. The TOE implements Elliptic-curve based Diffie-Hellman algorithms for SSH and TLS
key establishment.
The TOE acts as an SSH server to receive the communications for remote administration, and as a
client for TLS communications to transmit log data to a remote Syslog server.
Scheme SFR Service
RSA Key generation FCS_SSHS_EXT.1 SSH remote administration
FCS_TLSC_EXT.1 Transmit generated audit
data to an external IT entity
Elliptic-Curve Deffie-
Hellman Key establishment
FCS_TLSC_EXT.1 Transmit generated audit
data to an external IT entity
Elliptic-Curve Deffie-
Hellman Key establishment
FCS_SSHS_EXT.1 SSH remote administration
ECC key generation and key
establishment
FCS_SSHS_EXT.1 SSH remote administration
Table 13 Key generation and establishment methods and the corresponding services
Cryptographic key destruction TSF is defined by FCS_CKM.4. The table below describes how the TOE
meets this SFR, by specifying how each type of cryptographic key is securely destroyed from each
applicable storage media of the non-TOE hardware platform.
Name Description of Key Storage Zeroization
Diffie-Hellman
Shared Secret
This is the shared secret
used as part of the Diffie-
Hellman key exchange.
SDRAM (plaintext) Overwritten with:
zeros.
Automatically after
completion of DH
exchange.
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Diffie-Hellman
private exponent
This is the private
exponent used as part of
the Diffie-Hellman key
exchange.
SDRAM (plaintext) Overwritten with:
zeros.
Automatically after
completion of DH
exchange.
SSH/TLS session key The key is used for
encrypting/decrypting the
traffic in a secure
connection.
SDRAM (plaintext) Overwritten with:
zeros.
Automatically after
session terminated.
SSH private host key
The key for authentication.
Internal flash
(plaintext)
Overwritten with: a
new value of the key.
Overwritten by a
command.
TLS private key The key is used for
signature and
authentication.
Internal flash
(plaintext)
Overwritten with: a
new value of the key.
Overwritten by a
command.
RSA key pair The key pair is used for
digital signature and key
establishment.
SDRAM (plaintext) Overwritten with:
zeros.
Automatically after
completion of use of
the key.
RSA key pair The key pair is used for
digital signature and key
establishment.
Internal flash
(AES256 cipher)
Overwritten with:
zeros
Zeroized using “undo
rsa key-pair”
command.
ECC key pair The key pair is used for
digital signature and key
establishment.
SDRAM (plaintext) Overwritten with:
zeros.
Automatically after
completion of use of
the key.
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ECC key pair The key pair is used for
digital signature and key
establishment.
Internal flash
(AES256 cipher)
Overwritten with:
zeros
Zeroized using “undo
ecc key-pair”
command.
Table 14 Key destruction methods
7.2.2 Cryptographic operations
TSF related to cryptographic operations for data encryption and decryption are supported by the TOE
as follows.
AES encryption and decryption are provided by FCS_COP.1/DataEncryption. The TOE provides
symmetric encryption and decryption capabilities using AES algorithm with key size 128 bits, 256 bits
in GCM mode as specified in [ISO 19772].
• AES128 GCM, AES256 GCM are supported by TLS.
• AES128 GCM, AES256 GCM are supported by SSH.
Cryptographic signature verification and generation operations are supported by FCS_COP.1/SigGen.
The TOE provides cryptographic signature services using RSA with key sizes between 2048 to 4096
bits as specified in [FIPS 186-4] “Digital Signature Standard (DSS)”:
• The RSA with key size 2048 to 4096 is used for signature generation and verification of SSH.
• The RSA with key size of 2048 to 4096 is used for signature generation and verification of TLS.
• The RSA with key size of 2048 to 4096 is used for signature verification of the firmware during
the update or boot-up.
Cryptographic operations for SHA algorithms are supported by FCS_COP.1/Hash. The TOE provides
cryptographic hashing services using SHA-256, SHA-384 and SHA512 as specified in [FIPS Pub 180-3],
it also meet the [ISO/IEC 10118-3:2004]. The association of the hash function with other TSF
cryptographic functions is described in the table below:
Cryptographic Functions Hash Function
HMAC-SHA-256 SHA-256
TLS Digital signature verification SHA-256
SHA-384
SSH Digital signature verification SHA-256
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SHA-512
Hash_DRBG SHA-256
HMAC-SHA-384 SHA-384
Table 15 Association of the hash function with other crypto functions
Cryptographic operations for keyed-hash algorithms are supported by FCS_COP.1/KeyedHash. The
TOE provides cryptographic keyed hash services using HMAC-SHA-256 and HMAC-SHA-384 according
to [RFC 2104]: HMAC, it also complies with the [ISO/IEC 9797-2:2011], Section 7 “MAC Algorithm
2”. TLS performs keyed-hash message authentication in accordance with the specified cryptographic
algorithm: HMAC-SHA-256 and HMAC-SHA-384. The table below defines the parameters used for
HMAC cryptographic function:
HMAC functions Key length (bits) Hash function Block size (bits) Output MAC
length (bits)
HMAC-SHA-256 256 SHA-256 512 256
HMAC-SHA-384 384 SHA-384 1024 384
Table 16 HMAC parameters
7.2.3 Random Number Generation
Generation of random numbers is provided by FCS_RBG_EXT.1. The TOE implements a deterministic
random bit generator (DRBG) which is conformant to [ISO/IEC 18031:2011] using the DRBG
mechanism Hash_DRBG as specified in [SP800-90A], chap. 10.1.1. The entropy source is based on
software-based noise source and hardware-based noise source. The noise source from the hardware
is preferentially selected. If the noise source cannot be obtained, the noise source from the software
is obtained. Random numbers from the internal noise source are only used for seeding the DRBG. The
TOE sets a new seed using at least 256 bits entropy before generating random bits as cryptographic
key. The TSF uses Hash_DRBG to perform deterministic random bit generation. The identified hash
functions (SHA-256) are allowed for Hash_DRBG.
7.2.4 SSH protocol cryptography
Cryptography for SSH protocol in server implementation is provided by FCS_SSHS_EXT.1. The TOE
meets this SFR as follows:
• The TOE implements the SSH protocol that complies with RFCs 4251, 4252, 4253, 4254, 4256,
4344, 5647, 5656, 6668, 8268, 8308 section 3.1, and 8332. Both public key and password
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authentication modes are supported by SSH server function. The TOE implements the public
key algorithms rsa-sha2-256, rsa-sha2-512, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384 and
ecdsa-sha2-nistp521. SSH users can be authenticated in several modes: RSA, ECC, password,
password-RSA, and All (any authentication mode of RSA, ECC or password is allowed with
“ALL” mode). The SSH user created by administrators shall configure one mode. Then the
external SSH client can login SSH server successfully via the configured SSH user and
authentication mode.
• The TOE drops packets greater than 256 KB in an SSH transport connection. Packets of size
greater than 35000 bytes and smaller than 256 KB are not dropped because of that the TOE
may support uncompressed big certificates.
• SSH server function supports the encryption algorithms of aes128-gcm and aes256-gcm.
When SSH Client establishes a connection, it will send a list of encryption algorithms to SSH
server. SSH Server will check each algorithm in the list one by one. If it finds one algorithm in
the list that is also supported by it, this algorithm will be chosen as the encryption algorithm
between client and server. If no algorithm in the list is supported by SSH server, the
connection will be terminated. After the encryption algorithm is selected, Server and Client
will create a random number and exchange. Client and Server will use own random number
to create an encryption key. Then SSH server will use its own encryption key to encrypt packet,
and use SSH client’s encryption key to decrypt packet.
• SSH server function supports the public key algorithm of rsa-sha2-256, rsa-sha2-512, ecdsa-
sha2-nistp256, ecdsa-sha2-nistp384 and ecdsa-sha2-nistp521. Before SSH Client and SSH
Server build a connection, they both need to configure a Local Key-pair what is used for
authentication. In the TOE, this local key-pair is used for SSH server and SSH client. When
Client authenticates Server, first step is to consult public key algorithms. Client will send a list
of public key algorithms to SSH server. SSH Server will check each algorithm in the list one by
one. If it finds one algorithm in the list that is also supported by it, this algorithm will be chosen
as the public key algorithm between client and server. If no algorithm in the list is supported
by SSH server, the connection will be terminated. The SSH transport implementation doesn’t
support x509v3.
• SSH server supports the following key exchange algorithm: ecdh-sha2-nistp256, ecdh-sha2-
nistp384 and ecdh-sha2-nistp521.
• The SSH connection will be rekeyed after one hour of session time or one gigabyte of
transmitted data using that key which ever goes first. The SSH allows either side to force
another run of the key-exchange phase, changing the encryption and integrity keys for the
session. The idea is to do this periodically, after one hour of session time or one gigabyte of
transmitted data using that key which ever goes first.
7.2.5 Transport Layer Security Cryptography
TLS protocol-related cryptography is provided by FCS_TLSC_EXT.1. The TOE meets this SFR as follows:
• The TLS client supports the following ciphersuites:
o TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 as defined in [RFC 5288].
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o TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 as defined in [RFC 5288].
• The TOE supports configuring reference identifier and matching this identifier with server
certificate. The reference identifier is established by the user and by an application (a
parameter of an API). Based on a singular reference identifier’s source domain and application
service type (e.g. HTTP, FTP), the client establishes all reference identifiers including a
Common Name for the Subject Name field of the certificate and a (case-insensitive) DNS
name, URI name, and Service Name for the Subject Alternative Name field. The client then
compares this list of all acceptable reference identifiers to the presented identifiers in the TLS
server’s certificate.
• Only when the peer certificate is valid the TLS trusted channel can be established. If the peer
certificate is invalid, the connection will be rejected.
• TLS doesn’t support EC Extension in the Client Hello.
7.3 Identification and Authentication
This section describes how the TOE meets each security functional requirement that belongs to class
FIA (defined in [CC31R5P2]) and that is listed in Section 6 of this ST.
Authentication Failure Management TSF is provided by FIA_AFL.1. In order to meet this SFR, the TOE
can be configured within 3 to 5 unsuccessful authentication attempts by Administrators. When the
defined number of unsuccessful authentication attempts has been met, the TOE will prevent the
offending remote Administrator from successfully authenticating until unlock is taken by a local
Administrator or prevent the offending remote Administrator from successfully authenticating until
an Administrator defined time period has elapsed.
Password Management TSF is provided by FIA_PMG_EXT.1. In order to meet this SFR, the TOE
supports the local definition of users with corresponding passwords which are used for security
administrators’ authentication of local or remote administration connections. The passwords can be
composed of any combination of upper and lower case letters, numbers, and special characters (not
including spaces or question marks)”. Minimum password length is configurable by the Authorized
Administrator, and support passwords of 15 characters or greater. Password composition rules
specifying the types and number of required characters that comprise the password are settable by
the Authorized Administrator. Passwords have a maximum lifetime, configurable by the Authorized
Administrator. The administrative passwords at local console or over protocols support the same set
of special characters that listed in FIA_PGM_EXT.1.1.
User Identification and Authentication TSF is provided by FIA_UIA_EXT.1. The TOE meets this SFR as
follows:
• The TOE requires all users to be successfully identified and authenticated before allowing
execution of any TSF mediated action except display of the banner.
• The TOE supports user login over console or remote interface. Any login method need
authentication before successfully logon.
• Local access is achieved by console port. The console interface supports user-based AAA
authentication.
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• Remote access is achieved by SSH. Users can initiate a SSH session to login to a remote
interface by user-based AAA authentication. The TOE supports public-key of RSA or
username/password for identity authentication. It also supports associated identity
authentication of password and public-key. Users can also login with any of the identity
authentication modes of password, and RSA when their login mode are configured to be ‘ALL’.
• No services are available to users before authentication.
Password-based Authentication Mechanism is provided by FIA_UAU_EXT.2. In order to meet this SFR,
the TOE can be configured to require local authentication (using console interface) or remote
authentication (using SSH) as defined in the authentication policy for interactive (human) users.
Administrators are authenticated against a local user database. If the interactive (human) users
(Administrators) password is expired, the user is required to create a new password after correctly
entering the expired password.
Protected Authentication Feedback is given by FIA_UAU.7. When a user inputs their password at the
local console, the console will not display the input so that the user password is obscured. For remote
session authentication, the TOE does not echo any characters as they are entered. The TOE does not
provide any additional information to the user that would give any indication about the
authentication data.
Validation of X.509 certificates is provided by FIA_X509_EXT.1/Rev. This requirement is met by the
TOE as follows:
• The TOE supports to verify the certificate and the certificate path by the rules specified in
[RFC 5280], using algorithm RSA.
• The TOE supports to verify the revocation status by CRLs as specified in [RFC 5280].
Revocation status is verified using CRLs. TLS requires that certificates are used and this use
requires that the extendedKeyUsage rules are verified.
• The TOE validates the certificate by steps as below:
o Validate basic certificate fields and the extendedKeyUsage field.
o Validate the revocation status using CRL as specified in [RFC 5759].
o Validate certificate path as specified in [RFC 5280], do step 1 and 2 for every
certificate in the certificate chain.
o Validate the end of the certificate chain, it should be trusted root certificate.
• TLS requires that certificates are used and this use requires that the extendedKeyUsage rules
are verified. The validation is expected to end in a trusted root CA certificate in a root store
managed by the platform.
• The certificate path must end in a trusted root CA certificate otherwise it will be judged
invalid.
Authentication with X.509 certificates functionality is provided by FIA_X509_EXT.2. Such functionality
is used in TLS connections and code signing for system software updates. The TOE meets this SFR as
follows:
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• The certificate used by TLS authentication is sent by TLS server. The CRL should be loaded for
certificate validation.
• The TOE will send a security log when a connection cannot be established during the validity
check of a certificate used in establishing a trusted channel. TLS only supports RSA certificate.
The check of validity of the certificates takes place at authentication of TLS connection and verification
of code signing for system software updates. When the certificate is valid, we can trust the peer
identity and use the certificate to verify the integrity of the message. FIA_X509_EXT.2 and
FTP_ITC.1.1 both use TLS for secure communications. If the TSF can’t establish a connection to
determine the validity of a certificate, then the certificate is not accepted by the TSF.
7.4 TOE Management Functions
This section describes how the TOE meets each security functional requirement that belong to class
FMT (defined in [CC31R5P2]) and that is listed in Section 6 of this ST.
Management of security functions behavior related to manual updates is provided
by FMT_MOF.1/ManualUpdate. In order to meet this SFR, The TSF restricts the ability to enable the
functions to perform manual updates to Security Administrators. In addition, only administrators have
the right to create or delete users in the TOE. While changing the local user privilege level, the
configured new level of the local user cannot be higher than that of the login-in user. In this way no
user except administrators can change another user to be at the privilege level of administrator, and
only administrators have the ability to perform manual update. Therefore, the manual update is
restricted to administrators. The TOE uses groups to organize users.
Management of security functions behavior related to transmission of audit data to external IT
entities is provided FMT_MOF.1/Functions. The TOE meets this SFR by enforcing that:
• Only administrators have right to configure audit servers where audit records are exported
to.
• Only administrators have the privilege to choose the trusted channel for external audit server
and decide whether transmit the audit data to an external IT entity or not.
• Only administrators have the privilege to modify the behavior of TOE Security Functions (e.g.
cryptographic algorithm, audit server).
Management of TOE services by administrators is provided by FMT_MOF.1/Services. The TSF
enforces that only administrators have the ability to enable and disable the functions and services,
the other users are disallowed to do it. The services that can be enabled and disabled by
administrators are SSH, TLS, NTP and SYSLOG.
Management of security functions behavior related to TSF data is provided by FMT_MTD.1/CoreData.
This SFR is met by the TOE as follows:
• Only administrators have privilege to manage the TSF data, the other users are disallowed to
do it.
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• The TOE provides the ability for authorized administrators to access TOE data, such as audit
data, configuration data. Each of the predefined and administratively configured user has
different right to access the TOE data.
• The access control mechanisms of the TOE are based on hierarchical access levels where a
user level is associated with every user and terminal on the one hand and a command level is
associated with every command. Only if the user level is equal or higher to a specific
command, the user is authorized to execute this command. Management of security function
is realized through commands. So, for every management function sufficient user level is
required for the user to be able to execute the corresponding command.
Management functions related to cryptographic keys are defined by FMT_MTD.1/CryptoKeys. The
TOE enforces that only administrators have the right to delete, generate, import the cryptographic
keys or certificates., the other users are disallowed to do this.
Specification of management functions is provided by FMT_SMF.1. The TOE provides all the
capabilities necessary to securely manage the TOE. The administrative user can connect to the TOE
using the CLI to perform these functions via SSH encrypted session. The management functionality
provided by the TOE includes the list of management functions described in FMT_SMF.1 requirement,
which can be exercised by administrator logged into the TOE through local or remote sessions. The
ability to configure the available services before identification and authentication is not supported.
Restrictions on security roles are provided by FMT_SMR.2. A Security Administrator is able to
administer the TOE through the local console or through a remote mechanism (SSH). An administrator
can create, delete and modify the other users and endow them with a proper right according to the
users’ roles. The TOE uses groups to organize users. Different kinds of users are in different groups and
every group has a specific level that identity its roles and scope of rights. Every user in one group has
the same scope of rights that the group owns. The TOE has 4 default user groups: "manage-ug,
system-ug, monitor-ug, and visitor-ug.
7.5 Protection of the TSF
This section describes how the TOE meets each security functional requirement that belongs to class
FPT (defined in [CC31R5P2]) and that is listed in Section 6 of this ST; with the exception of
FPT_TUD_EXT.1, which is described in section 7.6 Trusted Updates.
TSF data protection for reading symmetric cryptographic keys is provided by FPT_SKP_EXT.1. In order
to meet this SFR, the TOE stores all pre-shared keys, symmetric keys, and private keys in the file
system in Flash that can’t be read, copy or extract by administrators; hence no interface access is
available.
Protection of administrator passwords is given by FPT_APW_EXT.1. The administrator passwords are
stored to configuration file in cryptographic form hashed with salt by SHA-256, including username
passwords, authentication passwords, console and virtual terminal line access passwords. In this
manner, the TOE ensures that plaintext user passwords will not be disclosed to anyone through
normal interfaces including administrators.
TSF Self-testing is provided by FPT_TST_EXT.1. In order to meet this SFR, the TSF run a suite of self-
tests during initial start-up to demonstrate the correct operation of the TSF, including software
integrity verification by digital signature check and the correct operation of cryptographic functions.
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During initial power on start-up, software integrity is verified at first. If the digital signature-based
check for the software fails, the start-up procedure is stopped. The cryptographic functions that are
tested at start-up are RSA 2048 and SHA256.
Reliable Time-stamps functionality is defined by FPT_STM_EXT.1. The TOE allows the administrator
to synchronize TOE’s time with an external time server using NTP protocol. The Network Time
Protocol (NTP) version 3 is supported by TOE. The NTP communications carried out by the TOE support
authentication using HMAC-SHA-256 algorithm.
7.6 Trusted Updates
This section describes how the TOE meets the security functional requirement FPT_TUD_EXT.1, which
belongs to the class FPT (defined in [CC31R5P2]) and that is listed in Section 6 of this ST.
Trusted updates-related TSF is provided by FPT_TUD_EXT.1. The TOE meets this SFR as follows:
• Only authenticated administrators have the ability to manually initiate an update to TOE
firmware/software. During the updating procedure, digital signature as defined at
FCS_COP.1/SigGen will be verified by the TOE at first.
• The administrators can query the currently executing version of the TOE firmware/software
as well as the most recently installed version by a command. The currently executing patches
and most recently installed patches can also be checked out.
• The validation of the firmware/software integrity is always performed before the process of
replacing the current installed version of the TOE with a software update. All parts of the TOE
software are archived together into a whole package and the single package is digitally signed.
RSA as specified in FCS_COP.1/SigGen can be used for firmware/software digital signature
verification mechanism, in order to authenticate it prior to installation, and that installation
fails if the verification fails.
7.7 TOE access
This section describes how the TOE meets each security functional requirement that belongs to class
FPT (defined in) and that is listed in Section 6 of this ST.
Locking of TSF-initiated sessions is provided by FTA_SSL_EXT.1. An administrator can configure
maximum inactivity times for both local and remote administrative sessions. When a session is
inactive (i.e., not session input) for the configured period of time the TOE will terminate the session,
will flush the screen, and no further activity is allowed, requiring the administrator to log in (be
successfully identified and authenticated) again to establish a new session. The allowable range is
from 0 minute 0 second to 35791 minutes 59 seconds.
TSF-initiated termination of remote interactive sessions is given by FTA_SSL.3 In order to meet this
SFR, when the remote session is inactive (i.e., not session input) for the configured period of time the
TOE will terminate the session.
User-initiated termination of sessions is provided by FTA_SSL.4. Administrators can use a command
to proactively terminate their interactive session in the TOE.
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Default access banners TSF is provided by FTA_TAB.1. The TOE meets this SFR as follows:
• To provide some prompts or alarms to users, Administrator can use the “header” command
to configure a notice and consent informative message to be displayed when an administrator
logs in the TOE. Administrator can directly specify the informative message, or they can
specify the message information by using the contents of a file. The message displayed is the
same for both local and remote users.
• When a terminal (remote or local) connection is activated and attempt to log in, the terminal
displays the contents of the title that is set by using the header login command. After the
successful login, the terminal displays the contents of the title that is configured by using the
header shell command.
• The local Console port and the remote SSH are used for an administrator to communicate
with the TOE.
7.8 Trusted path/channels
This section describes how the TOE meets each security functional requirement that belong to class
FTP (defined in [CC31R5P2]) and that is listed in Section 6 of this ST.
FTP_ITC.1 Inter-TSF trusted channel is met by the TOE by protecting communications with audit
server with a TLS-encrypted channel.
FTP_TRP.1 Trusted Path is met by the TOE by ensuring that all remote administrative communications
take place over a secure encrypted SSH session. The remote users are able to initiate SSH
communications with the TOE. When the administrators establish a session through SSH, an
informative banner will be displayed.
TLS protects the data from disclosure by encryption defined by FCS_COP.1/Hash and TLS ensures that
the data has not been modified by MAC defined by FCS_COP.1/KeyedHash.
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8 Acronyms
The following table shows the acronyms used in this document.
Acronym Meaning
PP Protection Profile
CC Common Criteria
TOE Target of Evaluation
TSF TOE Security Functionality
TSFi TSF Interface
OSP Organisational Security Policies
EAL Evaluation Assurance Level
ST Security Target
IT Information Technology
NTP Network Time Protocol
NMS Network Management Server
SMP System Manage Plane
VRP Versatile Routing Platform
SCP Service Control Plane
GCP General Control Plane
ARP Address Resolution Protocol
STP Spanning Tree Protocol
TCP Transmission Control Protocol
IP Internet Protocol
SSP System Service Plane
DP Data Plane
MAC Media Access Control Address
AAA Authentication Authorization Accounting
BGP Border Gateway Protocol
RSA Rivest, Shamir and Adleman
SHA Secure Hash Algorithm
HMAC Hash-based message authentication code
AES Advanced Encryption Standard
DRBG Deterministic random bit generator
DPF Data Packet Forwarding
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Acronym Meaning
IC Information Center
IS-IS Intermediate System to Intermediate System
ISO International Organization for Standardization
CLNP Connectionless Network Protocol
IETF Internet Engineering Task Force
OSI Open System Interconnection
VLAN Virtual Local Area Network
OSPF Open Shortest Path First
SSH Secure Shell
TLS Transport Layer Security
CA Certification Authority
Table 17 Abbreviations
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9 Glossary of Terms
Term Meaning
Augmentation Addition of one or more requirement(s) to a package
Evaluation Assurance
Level
Set of assurance requirements drawn from CC Part 3, representing a point
on the CC predefined assurance scale, that form an assurance package
Operational
Environment
Environment in which the TOE is operated
Protection Profile Implementation-independent statement of security needs for a TOE type
Security Target
Implementation-dependent statement of security needs for a specific
identified TOE
Target Of Evaluation
Set of software, firmware and/or hardware possibly accompanied by
guidance
Table 18 Glossary of terms
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10 Document References
The following table shows the acronyms used in this document.
Reference Document
[CC31R5P1]
Common Criteria for Information Technology Security Evaluation, Version
3.1, Revision 5, Part 1: Introduction and general model
[CC31R5P2]
Common Criteria for Information Technology Security Evaluation, Version
3.1, Revision 5, Part 2: Security functional components
[CC31R5P3]
Common Criteria for Information Technology Security Evaluation, Version
3.1, Revision 5, Part 3: Security assurance components
[RFC-1195]
Use of OSI IS-IS for Routing in TCP/IP and Dual Environments
(https://tools.ietf.org/html/rfc1195)
[FIPS 186-4]
National Institute of Standards and Technology, Digital Signature Standard
(DSS), Federal Information Processing Standards Publication FIPS PUB 186-
4, July 2013
[PKCS#1] RSA Cryptography Specifications Version 2.1(RFC3447)
[RFC 4251] The Secure Shell (SSH) Protocol Architecture, January 2006
[RFC 4252] The Secure Shell (SSH) Authentication Protocol, January 2006
[RFC 4253] The Secure Shell (SSH) Transport Layer Protocol, January 2006
[RFC 4254] The Secure Shell (SSH) Connection Protocol, January 2006
[RFC 6668]
SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport Layer
Protocol, July 2012
[RFC 3268]
Advanced Encryption Standard (AES) Ciphersuites for Transport Layer
Security (TLS), June 2002
[RFC 5246] The Transport Layer Security (TLS) Protocol Version 1.2, August 2008
[RFC 6125]
Representation and Verification of Domain-Based Application Service
Identity within Internet Public Key Infrastructure Using X.509 (PKIX)
Certificates in the Context of Transport Layer Security (TLS), March 2011
[ISO/IEC 18031:2011]
Information technology -- Security techniques -- Random bit generation,
Nov 2011
[ISO 18033-3]
Information technology — Security techniques — Encryption algorithms,
Dec 2010
[ISO/IEC 9796-2]
Information technology -- Security techniques -- Digital signature schemes
giving message recovery, Dec 2010
[ISO/IEC 9797-
2:2011]
Information technology -- Security techniques -- Message Authentication
Codes (MACs), May 2011
[ISO/IEC 10118-
3:2004]
Information technology -- Security techniques -- Hash-functions, March
2004
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Reference Document
[ISO 19772]
Information technology — Security techniques — Authenticated encryption,
Nov 2020
[FIPS Pub 180-3] Secure Hash Standard (SHS), Oct 2008
[RFC 2104] HMAC: Keyed-Hashing for Message Authentication, Feb 1997
[SP800-90A]
Recommendation for Random Number Generation Using Deterministic
Random Bit Generators, June 2015
[RFC 5288] AES Galois Counter Mode (GCM) Cipher Suites for TLS, Aug 2008
[RFC 5280]
Internet X.509 Public Key Infrastructure Certificate and Certificate
Revocation List (CRL) Profile, May 2008
[RFC 5759] Suite B Certificate and Certificate Revocation List (CRL) Profile, Jan 2010
[CPP_ND] Collaborative Protection Profile for Network Devices, Version 2.2e
[RFC 8332]
Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH)
Protocol, March 2018
Table 19 List of document references
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11 Appendices
11.1 Crypto Disclaimer
The following cryptographic algorithms are used by NetEngine AR6700&AR8000 to enforce its security
policy:
# Purpose Cryptographic
Mechanism
Standard of
Implementation
Key Size in
Bits
Standard
of
Application
Comments
1 Key
Generation
RSA and ECC
schemes
- 2048-BIT
OR
GREATER
(RSA)
And P-
256, P-384
and P-521
curves
(ECC)
FIPS PUB
186-4,
“Digital
Signature
Standard
(DSS)”,
Appendix
B.3 (RSA)
And FIPS
PUB 186-4,
“Digital
Signature
Standard
(DSS)”
(ECC)
FCS_CKM.1
2
Key
Establishment
Elliptic-curve
based key
establishment
schemes
Pair Wise Key
Establishment
Schemes Using
Integer
Factorization
Cryptography
- NIST
Special
Publication
800 56B
FCS_CKM.2
3
Confidentiality AES in GCM
mode
128 bits or
256 bits
AES as
specified in
ISO 18033-
3, GCM as
FCS_COP.1/
DataEncryption
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specified in
ISO 19772
4
Authentication
RSA Signature
ECDSA
Signature
RSA:
PKCS#1_V2.1,
RSASSA-
PKCS1v1_5
ECDSA:
Implementing
“NIST curves” P-
256, P-384, P-
521
3072/4096
bits
ECDSA:
256,384
and 521
bits
FIPS PUB
186-4,
“Digital
Signature
Standard
(DSS)”,
Section 5.5
FCS_COP.1/
SigGen
Digital signature
scheme 2 or
Digital Signature
scheme 3
3072 bits
(RSA)
and curves
nistp256,
nistp384
and
nistp521
(ECDSA)
ISO/IEC
9796-2,
Digital
signature
scheme 2
or Digital
Signature
scheme 3
(RSA) and
ISO/IEC
14888-3 IT
Security
techniques
— Digital
signatures
with
appendix
FCS_COP.1/
SigGen
Integrity HMAC-SHA-
256
HMAC-SHA-
384
-
256 bits
and 384
bits
ISO/IEC
9797-
2:2011,
Section 7
“MAC
FCS_COP.1/Hash
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Algorithm
2”
5
Cryptographic
Primitive
SHA-256,
SHA-384,
SHA-512
-
256 bits,
384 bits,
and 512
bits
ISO/IEC
9797-
2:2011,
Section 7
“MAC
Algorithm
2”
FCS_COP.1/Hash
6
Random Bit
Generation
Hash_DRBG
(any); DRG.2
acc. To
SP800-90A
-
256 bits SP800-90A
ISO/IEC
18031:2011
Table C.1
“Security
Strength
Table for
Hash
Functions”
FCS_RBG.1
7 Trusted
Channel
SSH V2.0
RFC 6668
RFC 4251
RFC 4252
RFC 4253
RFC 4254
RFC 4256
RFC 4344
RFC 5647
RFC 5656
RFC 8268
RFC 8308
RFC 8332
- -
FTP_TRP.1
TLS1.2 RFC 6125 - -
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RFC 3268
RFC 5246
FTP_ITC.1
Table 20 Crypto Disclaimer