Samsung Electronics Co., Ltd.
Samsung Galaxy Tab Active2 on
Android 8.1
(MDFPP31/WLANCEP10/VPNC21)
Security Target
Version 0.7
2019/09/03
Prepared for:
Samsung Electronics Co., Ltd.
416 Maetan-3dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-742 Korea
Prepared By:
www.gossamersec.com
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1. SECURITY TARGET INTRODUCTION........................................................................................................4
1.1 SECURITY TARGET REFERENCE......................................................................................................................5
1.2 TOE REFERENCE............................................................................................................................................5
1.3 TOE OVERVIEW .............................................................................................................................................5
1.4 TOE DESCRIPTION .........................................................................................................................................5
1.4.1 TOE Architecture...................................................................................................................................6
1.4.2 TOE Documentation ..............................................................................................................................8
2. CONFORMANCE CLAIMS..............................................................................................................................9
2.1 CONFORMANCE RATIONALE...........................................................................................................................9
3. SECURITY OBJECTIVES ..............................................................................................................................11
3.1 SECURITY OBJECTIVES FOR THE OPERATIONAL ENVIRONMENT ...................................................................11
4. EXTENDED COMPONENTS DEFINITION ................................................................................................12
5. SECURITY REQUIREMENTS.......................................................................................................................14
5.1 TOE SECURITY FUNCTIONAL REQUIREMENTS .............................................................................................14
5.1.1 Security audit (FAU)............................................................................................................................16
5.1.2 Cryptographic support (FCS)..............................................................................................................17
5.1.3 User data protection (FDP).................................................................................................................25
5.1.4 Identification and authentication (FIA) ...............................................................................................27
5.1.5 Security management (FMT) ...............................................................................................................31
5.1.6 Protection of the TSF (FPT) ................................................................................................................40
5.1.7 TOE access (FTA)................................................................................................................................42
5.1.8 Trusted path/channels (FTP) ...............................................................................................................43
5.2 TOE SECURITY ASSURANCE REQUIREMENTS...............................................................................................43
5.2.1 Development (ADV).............................................................................................................................44
5.2.2 Guidance documents (AGD)................................................................................................................44
5.2.3 Life-cycle support (ALC) .....................................................................................................................45
5.2.4 Tests (ATE) ..........................................................................................................................................46
5.2.5 Vulnerability assessment (AVA)...........................................................................................................46
6. TOE SUMMARY SPECIFICATION..............................................................................................................47
6.1 SECURITY AUDIT ..........................................................................................................................................47
6.2 CRYPTOGRAPHIC SUPPORT ...........................................................................................................................49
6.3 USER DATA PROTECTION ..............................................................................................................................55
6.4 IDENTIFICATION AND AUTHENTICATION.......................................................................................................58
6.5 SECURITY MANAGEMENT .............................................................................................................................62
6.6 PROTECTION OF THE TSF .............................................................................................................................63
6.7 TOE ACCESS.................................................................................................................................................66
6.8 TRUSTED PATH/CHANNELS ...........................................................................................................................67
6.9 KNOX WORKSPACE CONTAINER FUNCTIONALITY........................................................................................67
7. TSF INVENTORY ............................................................................................................................................69
LIST OF TABLES
Table 1 Evaluated Devices ..........................................................................................................................................6
Table 2 Equivalent Devices.........................................................................................................................................6
Table 3 Carrier Models...............................................................................................................................................6
Table 4 Technical Decisions........................................................................................................................................9
Table 5 TOE Security Functional Components ......................................................................................................16
Table 6 Security Management Functions ................................................................................................................39
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Table 7 EAL 1 augmented with ALC_TSU_EXT.1 Assurance Components.......................................................43
Table 8 Audit Events .................................................................................................................................................48
Table 9 Asymmetric Key Generation per module ..................................................................................................49
Table 10 Wi-Fi Alliance Certificates........................................................................................................................49
Table 12 Salt Creation...............................................................................................................................................50
Table 13 BoringSSL Cryptographic Algorithms ....................................................................................................51
Table 14 Samsung Kernel Cryptographic Algorithms...........................................................................................51
Table 15 SCrypto TEE Cryptographic Algorithms................................................................................................51
Table 16 Samsung Flash Memory Protector Driver (Kernel) Algorithms ...........................................................51
Table 17 Chipset Hardware Cryptographic Algorithms........................................................................................52
Table 19 Key Management Matrix ..........................................................................................................................55
Table 20 Access Control Categories.........................................................................................................................57
Table 22 Power-up Cryptographic Algorithm Self-Tests ......................................................................................65
Table 23 TSF Files Inventory ...................................................................................................................................70
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1. Security Target Introduction
This section identifies the Security Target (ST) and Target of Evaluation (TOE) identification, ST conventions, ST
conformance claims, and the ST organization. The TOE consists of the Samsung Galaxy Tab Active2 on Android
8.1 provided by Samsung Electronics Co., Ltd.. The TOE is being evaluated as a Mobile Device.
The Security Target contains the following additional sections:
 Conformance Claims (Section 2)
 Security Objectives (Section 3)
 Extended Components Definition (Section 4)
 Security Requirements (Section 5)
 TOE Summary Specification (Section 6)
Acronyms and Terminology
AA Assurance Activity
BAF Biometric Authentication Factor
CC Common Criteria
CCEVS Common Criteria Evaluation and Validation Scheme
EAR Entropy Analysis Report
GUI Graphical User Interface
PCL Product Compliant List
PP Protection Profile
SAR Security Assurance Requirement
SFR Security Functional Requirement
SOF Strength of Function
ST Security Target
TEE Trusted Execution Environment (TrustZone)
TOE Target of Evaluation
U.S. United States
VR Validation Report
Conventions
The following conventions have been applied in this document:
 Security Functional Requirements – Part 2 of the CC defines the approved set of operations that may be
applied to functional requirements: iteration, assignment, selection, and refinement.
o Iteration: allows a component to be used more than once with varying operations. In the ST,
iteration is indicated by a parenthetical number placed at the end of the component. For example
FDP_ACC.1(1) and FDP_ACC.1(2) indicate that the ST includes two iterations of the
FDP_ACC.1 requirement.
o Assignment: allows the specification of an identified parameter. Assignments are indicated using
bold and are surrounded by brackets (e.g., [assignment]). Note that an assignment within a
selection would be identified in italics and with embedded bold brackets (e.g., [[selected-
assignment]]).
o Selection: allows the specification of one or more elements from a list. Selections are indicated
using bold italics and are surrounded by brackets (e.g., [selection]).
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o Refinement: allows the addition of details. Refinements are indicated using bold, for additions,
and strike-through, for deletions (e.g., “… all objects …” or “… some big things …”).
 Other sections of the ST – Other sections of the ST use bolding to highlight text of special interest, such as
captions.
1.1 Security Target Reference
ST Title – Samsung Electronics Co., Ltd. Samsung Galaxy Tab Active2 on Android 8.1
(MDFPP31/WLANCEP10/VPNC21) Security Target
ST Version – Version 0.7
ST Date – 2019/09/03
1.2 TOE Reference
TOE Identification – Samsung Electronics Co., Ltd. Samsung Galaxy Tab Active2 on Android 8.1.
TOE Developer – Samsung Electronics Co., Ltd.
Evaluation Sponsor – Samsung Electronics Co., Ltd.
1.3 TOE Overview
The Target of Evaluation (TOE) are the Samsung Galaxy Tab Active2 on Android 8.1.
1.4 TOE Description
The TOE is a mobile device based on Android 8.1 with a built-in IPsec VPN client and modifications made to
increase the level of security provided to end users and enterprises. The TOE is intended for use as part of an
enterprise mobility solution providing mobile staff with enterprise connectivity.
The TOE includes a Common Criteria mode (or “CC mode”) that an administrator can invoke using an MDM. The
TOE must meet the following prerequisites in order for an administrator to transition the TOE to and remain in the
CC configuration.
 Require a screen lock password (swipe, PIN, pattern, accessibility (direction), or facial recognition screen
locks are not allowed).
 The maximum password failure retry policy should be less than or equal to 30.
 A screen lock password required to decrypt data on boot.
 Revocation checking must be enabled.
 External storage must be encrypted.
 Password (non-container) recovery policy and password history must not be enabled.
When CC mode has been enabled, the TOE behaves as follows:
 The TOE sets the system wide Android CC mode property to enabled.
 The TOE prevents loading of custom firmware/kernels and requires all updates occur through FOTA
(Samsung’s Firmware Over The Air firmware update method).
 The TOE utilizes CAVP approved cryptographic ciphers for TLS.
 The TOE ensures FOTA updates utilize 2048-bit PKCS #1 RSA-PSS formatted signatures (with SHA-512
hashing).
The TOE includes a containerization capability, Knox Workspace Container, which is part of the Knox Platform.
This container provides a way to segment applications and data into two separate areas on the device, such as a
personal area and a work area, each with its own separate apps, data and security policies. For this effort the TOE
was evaluated both without and with a Knox Workspace container created (and to create a Knox Workspace
container, one must purchase an additional license). Thus, the evaluation includes several Knox-specific claims that
apply to a Knox Workspace container when created.
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There are different models of the TOE, the Samsung Galaxy Tab Active2 on Android 8.1, and these models differ in
their internal components (as described in the table below).
The model numbers of the mobile devices used during evaluation testing are as follows:
Device Name
Model
Number
Chipset
Vendor
CPU
Build
Arch/ISA
Android
Version
Kernel
Version
Build
Number
Galaxy Tab
Active2
SM-T397U Samsung Exynos 7870 A32 8.1 3.18.14 M1AJQ
Table 1 Evaluated Devices
In addition to the evaluated devices, the following device models are claimed as equivalent with a note about the
differences between the evaluated device and the equivalent models.
Evaluated Device CPU Equivalent Devices Differences
Galaxy Tab Active2
(T397)
Exynos 7870 Galaxy Tab Active2
T390 & T397 models have 32GB
of storage, T395 has 16GB
T395 & T397 models have LTE
Table 2 Equivalent Devices
In general, the devices include a final letter or number at the end of the name that denotes that the device is for a
specific carrier or region (for example, U = US Carrier build and F = International, which were used during the
evaluation).
For each device there are specific models which are validated. This table lists the specific carrier models that have
the validated configuration (covering both evaluated and equivalent devices).
Device Name Base Model Number Carrier Models
Galaxy Tab Active2
SM-T390 None
SM-T395 None
SM-T397 U
Table 3 Carrier Models
Where Carrier Models specifies “None” that means a device without a suffix is also a device that can be placed into
a validated configuration.
1.4.1 TOE Architecture
The TOE combines with a Mobile Device Management solution (note that this evaluation does not include an MDM
agent nor server) that enables the Enterprise to watch, control and administer all deployed mobile devices, across
multiple mobile service providers as well as facilitate secure communications through a VPN. This partnership
provides a secure mobile environment that can be managed and controlled by the environment and reduces the risks
that can be introduced through a Bring-Your-Own-Device (BYOD) model which can be extended to Corporate-
Owned-Personally-Enabled (COPE) or other corporate-owned deployments.
Data on the TOE is protected through the implementation of Samsung On-Device Encryption (ODE) that utilizes a
CAVP certified cryptographic algorithms to encrypt device storage. This functionality is combined with a number of
on-device policies including local wipe, remote wipe, password complexity, automatic lock and privileged access to
security configurations to prevent unauthorized access to the device and stored data.
The Samsung Knox Software Development Kit (SDK) builds on top of the existing Android security model by
expanding the current set of security configuration options to more than 600 configurable policies and including
additional security functionality such as application whitelisting and blacklisting.
The Knox Platform for Enterprise provides a set of flexible deployment options for Work environments, including
the ability to enhance the BYOD or COPE models by creating a separate container for the Enterprise (the
Workspace). Within the Knox Workspace, the Enterprise can provision separate applications and ensure they are
kept separate from anything the user may do outside the Knox Workspace. The Enterprise can use policy controls to
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manage a Work environment on the device as a whole or within the Knox Workspace container specifically, as
needed by the organization.
1.4.1.1 Physical Boundaries
The TOE is a multi-user mobile device based on Android 8.1 that incorporates the Samsung Knox SDK. The TOE
does not include the user applications that run on top of the operating system, but does include controls that limit
application behavior. The TOE includes an IPsec VPN client integrated into the firmware (as opposed to a
downloadable application). Within an Enterprise environment, the Enterprise can manage the configuration of the
mobile device, including the VPN client, through a compliant device management solution.
The TOE communicates and interacts with 802.11-2012 Access Points and mobile data networks to establish
network connectivity, and the through that connectivity interacts with MDM servers that allow administrative
control of the TOE.
1.4.1.2 Logical Boundaries
This section summarizes the security functions provided by the Samsung Galaxy Tab Active2 on Android 8.1:
 Security Audit
 Cryptographic support
 User data protection
 Identification and authentication
 Security management
 Protection of the TSF
 TOE access
 Trusted path/channels
1.4.1.2.1 Security audit
The TOE generates logs for a range of security relevant events. The TOE stores the logs locally so they can be
accessed by an administrator or they can be exported to an MDM.
1.4.1.2.2 Cryptographic support
The TOE includes multiple cryptographic libraries with CAVP certified algorithms for a wide range of
cryptographic functions including: asymmetric key generation and establishment, symmetric key generation,
encryption/decryption, cryptographic hashing and keyed-hash message authentication. These functions are
supported with suitable random bit generation, key derivation, salt generation, initialization vector generation,
secure key storage, and key and protected data destruction. These primitive cryptographic functions are used to
implement security protocols such as TLS, EAP-TLS, IPsec, and HTTPS and to encrypt the media (including the
generation and protection of data and key encryption keys) used by the TOE. Many of these cryptographic functions
are also accessible as services to applications running on the TOE.
1.4.1.2.3 User data protection
The TOE controls access to system services by hosted applications, including protection of the Trust Anchor
Database. Additionally, the TOE protects user and other sensitive data using encryption so that even if a device is
physically lost, the data remains protected. The functionality provided by a Knox Workspace container enhances
the security of user data by providing an additional layer of separation between different categories of apps and data
while the device is in use. The TOE ensures that residual information is protected from potential reuse in accessible
objects such as network packets.
1.4.1.2.4 Identification and authentication
The TOE supports a number of features related to identification and authentication. From a user perspective, except
for making phone calls to an emergency number, a password or Biometric Authentication Factor (BAF) must be
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correctly entered to unlock the TOE. In addition, even when the TOE is unlocked the password must be re-entered to
change the password or re-enroll the biometric template. Passwords are obscured when entered so they cannot be
read from the TOE's display, the frequency of entering passwords is limited and when a configured number of
failures occurs, the TOE will be wiped to protect its contents. Passwords can be constructed using upper and lower
case characters, numbers, and special characters and passwords between 4 and 16 characters are supported.
The TOE can also serve as an 802.1X supplicant and can use X.509v3 and validate certificates for EAP-TLS, TLS
and IPsec exchanges. The TOE can also act as a client or server in an authenticated Bluetooth pairing. In addition
to storing X.509 certificates used for IPsec connections, the TOE can also securely store pre-shared keys for VPN
connections.
1.4.1.2.5 Security management
The TOE provides all the interfaces necessary to manage the security functions (including the VPN client) identified
throughout this Security Target as well as other functions commonly found in mobile devices. Many of the available
functions are available to users of the TOE while many are restricted to administrators operating through a Mobile
Device Management solution once the TOE has been enrolled. Once the TOE has been enrolled and then un-
enrolled, it removes all MDM policies and disables CC mode.
1.4.1.2.6 Protection of the TSF
The TOE implements a number of features to protect itself to ensure the reliability and integrity of its security
features. It protects particularly sensitive data such as cryptographic keys so that they are not accessible or
exportable. It also provides its own timing mechanism to ensure that reliable time information is available (e.g., for
log accountability). It enforces read, write, and execute memory page protections, uses address space layout
randomization, and stack-based buffer overflow protections to minimize the potential to exploit application flaws. It
also protects itself from modification by applications as well as isolates the address spaces of applications from one
another to protect those applications.
The TOE includes functions to perform self-tests and software/firmware integrity checking so that it might detect
when it is failing or may be corrupt. If any of the self-tests fail, the TOE will not go into an operational mode. It also
includes mechanisms (i.e., verification of the digital signature of each new image) so that the TOE itself can be
updated while ensuring that the updates will not introduce malicious or other unexpected changes in the TOE.
Digital signature checking also extends to verifying applications prior to their installation.
1.4.1.2.7 TOE access
The TOE can be locked, obscuring its display, by the user or after a configured interval of inactivity. The TOE also
has the capability to display an advisory message (banner) when users unlock the TOE for use.
The TOE is also able to attempt to connect to wireless networks as configured.
1.4.1.2.8 Trusted path/channels
The TOE supports the use of 802.11-2012, 802.1X, EAP-TLS, TLS, HTTPS and IPsec to secure communications
channels between itself and other trusted network devices.
1.4.2 TOE Documentation
 Samsung Android 8.x on Galaxy Devices Administrator Guide, version 4.2, September 3, 2019
 Samsung VPN Client on Galaxy Devices Administrator Guide, version 4.2, June 14, 2019
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2. Conformance Claims
This TOE is conformant to the following CC specifications:
 Common Criteria for Information Technology Security Evaluation Part 2: Security functional components,
Version 3.1, Revision 5, April 2017.
 Part 2 Extended
 Common Criteria for Information Technology Security Evaluation Part 3: Security assurance components,
Version 3.1 Revision 5, April 2017.
 Part 3 Conformant
 Package Claims:
 Protection Profile for Mobile Device Fundamentals, Version 3.1, 16 June 2017, General Purpose
Operating Systems Protection Profile/Mobile Device Fundamentals Protection Profile Extended
Package (EP) Wireless Local Area Network (WLAN) Clients, Version 1.0, 08 February 2016 and
PP-Module for Virtual Private Network (VPN) Clients, Version 2.1, 05 October 2017
(MDFPP31/WLANCEP10/VPNC21)
 Technical Decisions as of July 22, 2019:
TD No. PP Applied Rationale
TD0194 WLANCEP10 Yes Impacts required audit events
TD0244 MDFPP31
WLANCEP10
Yes Allows additional TLSC curves
TD0301 MDFPP31 Yes Biometrics supported and affects FMT_SMF_EXT.3
Assurance Activities
TD0303 VPNC21 Yes IKEv1 with XAUTH supported
TD0304 MDFPP31 Yes Impacts Assurance Activities
TD0305 MDFPP31 Yes Impacts Assurance Activities
TD0330 VPNC21 Yes Updates FCS_CKM.1 key generation
TD0346 MDFPP31 Yes Removes selection from FMT_SMF_EXT.2.1
TD0347 MDFPP31 Yes Updates Use Case 2
TD0351 MDFPP31 Yes Adds DEK selections to FCS_CKM_EXT.2.1
TD0355 VPNC21 No Applies to VPN client being evaluated with App PP
TD0362 VPNC21 No Random PSK generation not selected
TD0366 MDFPP31 Yes FCS_COP.1(5) updated language per TD
TD0369 MDFPP31 Yes LTTCKM present
TD0371 MDFPP31 Yes Updates Use Case 2
TD0373 VPNC21 No Applies to VPN client being evaluated with App PP
TD0378 VPNC21 Yes TOE/TOE Platform selection in FCS_IPSEC.1
TD0379 VPNC21 Yes FCS_IPSEC_EXT.1.11 tests updated
TD0385 VPNC21 No Applies to VPN client being evaluated with App PP
TD0387 VPNC21 No Applies to VPN client being evaluated with GPOS PP
TD0413 MDFPP31 Yes Update to properly allow VPN PP-Module
TD0426 MDFPP31 Yes Correction of Inconsistency with RFC7748
Table 4 Technical Decisions
2.1 Conformance Rationale
The ST conforms to the MDFPP31/WLANCEP10/VPNC21. As explained previously, the security problem
definition, security objectives, and security requirements are defined in the PP.
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3. Security Objectives
The Security Problem Definition may be found in the MDFPP31/WLANCEP10/VPNC21 and this section
reproduces only the corresponding Security Objectives for operational environment for reader convenience. The
MDFPP31/WLANCEP10/VPNC21 offers additional information about the identified security objectives, but that
has not been reproduced here and the MDFPP31/WLANCEP10/VPNC21 should be consulted if there is interest in
that material.
In general, the MDFPP31/WLANCEP10/VPNC21 has defined Security Objectives appropriate for Mobile Devices
and as such are applicable to the Samsung Galaxy Tab Active2 on Android 8.1 TOE.
3.1 Security Objectives for the Operational Environment
 OE.CONFIG TOE administrators will configure the Mobile Device security functions correctly to create
the intended security policy.
 OE.NO_TOE_BYPASS (WLANCEP10) Information cannot flow between external and internal networks
located in different enclaves without passing through the TOE.
 OE.NOTIFY The Mobile User will immediately notify the administrator if the Mobile Device is lost or
stolen.
 OE.PRECAUTION The Mobile User exercises precautions to reduce the risk of loss or theft of the Mobile
Device.
 OE.TRUSTED_ADMIN (WLANCEP10) TOE Administrators are trusted to follow and apply all
administrator guidance in a trusted manner.
 OE.NO_TOE_BYPASS (VPNC21) Information cannot flow onto the network to which the VPN client's
host is connected without passing through the TOE.
 OE.PHYSICAL (VPNC21) Physical security, commensurate with the value of the TOE and the data it
contains, is assumed to be provided by the environment.
 OE.TRUSTED_CONFIG (VPNC21) Personnel configuring the TOE and its operational environment will
follow the applicable security configuration guidance.
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4. Extended Components Definition
All of the extended requirements in this ST have been drawn from the MDFPP31/WLANCEP10/VPNC21. The
MDFPP31/WLANCEP10/VPNC21 defines the following extended SFRs and SARs and since they are not redefined
in this ST the MDFPP31/WLANCEP10/VPNC21 should be consulted for more information in regard to those CC
extensions.
Extended SFRs:
 FCS_CKM_EXT.1: Extended: Cryptographic Key Support
 FCS_CKM_EXT.2: Extended: Cryptographic Key Random Generation
 FCS_CKM_EXT.3: Extended: Cryptographic Key Generation
 FCS_CKM_EXT.4: Extended: Key Destruction
 FCS_CKM_EXT.5: Extended: TSF Wipe
 FCS_CKM_EXT.6: Extended: Salt Generation
 FCS_HTTPS_EXT.1: Extended: HTTPS Protocol
 FCS_IPSEC_EXT.1: Extended: IPsec
 FCS_IV_EXT.1: Extended: Initialization Vector Generation
 FCS_RBG_EXT.1: Extended: Cryptographic Operation (Random Bit Generation)
 FCS_RBG_EXT.2: Extended: Cryptographic Operation (Random Bit Generation)
 FCS_SRV_EXT.1: Extended: Cryptographic Algorithm Services
 FCS_STG_EXT.1: Extended: Cryptographic Key Storage
 FCS_STG_EXT.2: Extended: Encrypted Cryptographic Key Storage
 FCS_STG_EXT.3: Extended: Integrity of encrypted key storage
 FCS_TLSC_EXT.1: Extended: TLS Protocol
 FCS_TLSC_EXT.1/WLAN: Extended: Extensible Authentication Protocol-Transport Layer Security - WLAN
 FCS_TLSC_EXT.2/WLAN: Extended: TLS Client Protocol - WLAN
 FDP_ACF_EXT.1: Extended: Security access control
 FDP_DAR_EXT.1: Extended: Protected Data Encryption
 FDP_DAR_EXT.2: Extended: Sensitive Data Encryption
 FDP_IFC_EXT.1: Extended: Subset information flow control
 FDP_STG_EXT.1: Extended: User Data Storage
 FDP_UPC_EXT.1: Extended: Inter-TSF user data transfer protection
 FIA_AFL_EXT.1: Extended: Authentication failure handling
 FIA_BLT_EXT.1: Extended: Bluetooth User Authorization
 FIA_BLT_EXT.2: Extended: Bluetooth Mutual Authentication
 FIA_BLT_EXT.3: Extended: Rejection of Duplicate Bluetooth Connections
 FIA_BLT_EXT.4: Extended: Secure Simple Pairing
 FIA_PAE_EXT.1: Extended: Port Access Entity Authentication
 FIA_PMG_EXT.1: Extended: Password Management
 FIA_PSK_EXT.1: Extended: Pre-Shared Key Composition - VPN
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 FIA_TRT_EXT.1: Extended: Authentication Throttling
 FIA_UAU_EXT.1: Extended: Authentication for Cryptographic Operation
 FIA_UAU_EXT.2: Extended: Timing of Authentication
 FIA_UAU_EXT.4: Extended: Secondary User Authentication
 FIA_X509_EXT.1: Extended: Validation of certificates
 FIA_X509_EXT.2: Extended: X509 certificate authentication
 FIA_X509_EXT.2/WLAN: Extended: X.509 Certificate Authentication (EAP-TLS) - WLAN
 FIA_X509_EXT.3: Extended: Request Validation of certificates
 FMT_MOF_EXT.1: Extended: Management of security functions behavior
 FMT_SMF_EXT.1: Extended: Specification of Management Functions
 FMT_SMF_EXT.1/WLAN: Extended: Specification of Management Functions -WLAN
 FMT_SMF_EXT.2: Extended: Specification of Remediation Actions
 FMT_SMF_EXT.3 Extended: Current Administrator
 FPT_AEX_EXT.1: Extended: Anti-Exploitation Services (ASLR)
 FPT_AEX_EXT.2: Extended: Anti-Exploitation Services (Memory Page Permissions)
 FPT_AEX_EXT.3: Extended: Anti-Exploitation Services (Overflow Protection)
 FPT_AEX_EXT.4: Extended: Domain Isolation
 FPT_AEX_EXT.6: Extended: Anti-Exploitation Services (Memory Page Permissions)
 FPT_BBD_EXT.1: Extended: Application Processor Mediation
 FPT_JTA_EXT.1: Extended: JTAG Disablement
 FPT_KST_EXT.1: Extended: Key Storage
 FPT_KST_EXT.2: Extended: No Key Transmission
 FPT_KST_EXT.3: Extended: No Plaintext Key Export
 FPT_NOT_EXT.1: Extended: Self-Test Notification
 FPT_TST_EXT.1: Extended: TSF Cryptographic Functionality Testing
 FPT_TST_EXT.1/WLAN: Extended: TSF Cryptographic Functionality Testing - WLAN
 FPT_TST_EXT.1/VPN: Extended: TSF Self-Test - VPN
 FPT_TST_EXT.2(1): Extended: TSF Integrity Testing
 FPT_TST_EXT.2(2): Extended: TSF Integrity Testing
 FPT_TUD_EXT.1: Extended: Trusted Update: TSF version query
 FPT_TUD_EXT.2: Extended: Trusted Update Verification
 FTA_SSL_EXT.1: Extended: TSF- and User-initiated locked state
 FTA_WSE_EXT.1: Extended: Wireless Network Access - WLAN
 FTP_BLT_EXT.2: Extended: Bluetooth Encryption
 FTP_ITC_EXT.1: Extended: Trusted channel Communication
 FTP_ITC_EXT.1/WLAN: Extended: Trusted Channel Communication (Wireless LAN) - WLAN
Extended SARs:
 ALC_TSU_EXT.1: Timely Security Updates
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5. Security Requirements
This section defines the Security Functional Requirements (SFRs) and Security Assurance Requirements (SARs)
that serve to represent the security functional claims for the Target of Evaluation (TOE) and to scope the evaluation
effort.
The SFRs have all been drawn from the MDFPP31/WLANCEP10/VPNC21. The refinements and operations
already performed in the MDFPP31/WLANCEP10/VPNC21 are not identified (e.g., highlighted) here, rather the
requirements have been copied from the MDFPP31/WLANCEP10/VPNC21 and any residual operations have been
completed herein. Of particular note, the MDFPP31/WLANCEP10/VPNC21 made a number of refinements and
completed some of the SFR operations defined in the Common Criteria (CC) and that PP should be consulted to
identify those changes if necessary.
The SARs are also drawn from the MDFPP31/WLANCEP10/VPNC21 which include all the SARs for EAL 1
augmented with ALC_TSU_EXT.1. However, the SARs are effectively refined since requirement-specific
'Assurance Activities' are defined in the MDFPP31/WLANCEP10/VPNC21 that serve to ensure corresponding
evaluations will yield more practical and consistent assurance than the assurance requirements alone. The
MDFPP31/WLANCEP10/VPNC21 should be consulted for the assurance activity definitions.
5.1 TOE Security Functional Requirements
The following table identifies the SFRs that are satisfied by the Samsung Galaxy Tab Active2 on Android 8.1 TOE.
Requirement Class Requirement Component
FAU: Security FAU_GEN.1: Audit Data Generation
Audit FAU_SAR.1: Audit Review
FAU_SEL.1: Selective Audit
FAU_STG.1: Audit Storage Protection
FAU_STG.4: Prevention of Audit Data Loss
FCS: FCS_CKM.1: Cryptographic key generation
Cryptographic
support
FCS_CKM.1/WLAN: Cryptographic Key Generation (Symmetric Keys for WPA2
Connections) - WLAN
FCS_CKM.1/VPN: Cryptographic Key Generation (IKE) - VPN
FCS_CKM.2(1): Cryptographic key establishment
FCS_CKM.2(2): Cryptographic key establishment (While device is locked)
FCS_CKM.2/WLAN: Cryptographic Key Distribution (GTK) - WLAN
FCS_CKM_EXT.1: Extended: Cryptographic Key Support
FCS_CKM_EXT.2: Extended: Cryptographic Key Random Generation
FCS_CKM_EXT.3: Extended: Cryptographic Key Generation
FCS_CKM_EXT.4: Extended: Key Destruction
FCS_CKM_EXT.5: Extended: TSF Wipe
FCS_CKM_EXT.6: Extended: Salt Generation
FCS_COP.1(1): Cryptographic operation
FCS_COP.1(2): Cryptographic operation
FCS_COP.1(3): Cryptographic operation
FCS_COP.1(4): Cryptographic operation
FCS_COP.1(5): Cryptographic operation
FCS_HTTPS_EXT.1: Extended: HTTPS Protocol
FCS_IPSEC_EXT.1: Extended: IPsec
FCS_IV_EXT.1: Extended: Initialization Vector Generation
FCS_RBG_EXT.1: Extended: Cryptographic Operation (Random Bit Generation)
FCS_RBG_EXT.2: Extended: Cryptographic Operation (Random Bit Generation)
FCS_SRV_EXT.1: Extended: Cryptographic Algorithm Services
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Requirement Class Requirement Component
FCS_SRV_EXT.2: Extended: Cryptographic Algorithm Services
FCS_STG_EXT.1: Extended: Cryptographic Key Storage
FCS_STG_EXT.2: Extended: Encrypted Cryptographic Key Storage
FCS_STG_EXT.3: Extended: Integrity of encrypted key storage
FCS_TLSC_EXT.1: Extended: TLS Protocol
FCS_TLSC_EXT.1/WLAN: Extended: Extensible Authentication Protocol-
Transport Layer Security - WLAN
FCS_TLSC_EXT.2: Extended: TLS Protocol
FCS_TLSC_EXT.2/WLAN: Extended: TLS Client Protocol - WLAN
FDP: User data FDP_ACF_EXT.1: Extended: Security access control
protection FDP_ACF_EXT.2: Extended: Security access control
FDP_ACF_EXT.3: Extended: Security attribute based access control
FDP_DAR_EXT.1: Extended: Protected Data Encryption
FDP_DAR_EXT.2: Extended: Sensitive Data Encryption
FDP_IFC_EXT.1: Extended: Subset information flow control
FDP_PBA_EXT.1: Extended: Storage of Critical Biometric Parameters
FDP_RIP.2: Full Residual Information Protection
FDP_STG_EXT.1: Extended: User Data Storage
FDP_UPC_EXT.1: Extended: Inter-TSF user data transfer protection
FIA: Identification FIA_AFL_EXT.1: Extended: Authentication failure handling
and authentication FIA_BLT_EXT.1: Extended: Bluetooth User Authorization
FIA_BLT_EXT.2: Extended: Bluetooth Mutual Authentication
FIA_BLT_EXT.3: Extended: Rejection of Duplicate Bluetooth Connections
FIA_BLT_EXT.4: Extended: Secure Simple Pairing
FIA_BLT_EXT.6: Extended: Bluetooth User Authorization
FIA_BMG_EXT.1(1): Extended: Accuracy of Biometric Authentication
FIA_BMG_EXT.1(2): Extended: Accuracy of Biometric Authentication
FIA_PAE_EXT.1: Extended: Port Access Entity Authentication
FIA_PMG_EXT.1: Extended: Password Management
FIA_PSK_EXT.1: Extended: Pre-Shared Key Composition - VPN
FIA_TRT_EXT.1: Extended: Authentication Throttling
FIA_UAU.5: Multiple Authentication Mechanisms
FIA_UAU.6(1): Re-Authentication
FIA_UAU.6(2): Re-Authentication
FIA_UAU.7: Protected authentication feedback
FIA_UAU_EXT.1: Extended: Authentication for Cryptographic Operation
FIA_UAU_EXT.2: Extended: Timing of Authentication
FIA_UAU_EXT.4: Extended: Secondary User Authentication
FIA_X509_EXT.1: Extended: Validation of certificates
FIA_X509_EXT.2: Extended: X509 certificate authentication
FIA_X509_EXT.2/WLAN: Extended: X.509 Certificate Authentication (EAP-
TLS) - WLAN
FIA_X509_EXT.3: Extended: Request Validation of certificates
FMT: Security FMT_MOF_EXT.1: Extended: Management of security functions behavior
management FMT_SMF_EXT.1: Extended: Specification of Management Functions
FMT_SMF_EXT.1/WLAN: Extended: Specification of Management Functions -
WLAN
FMT_SMF.1/VPN: Specification of Management Functions - VPN
FMT_SMF_EXT.2: Extended: Specification of Remediation Actions
FMT_SMF_EXT.3 Extended: Current Administrator
FPT: Protection of FPT_AEX_EXT.1: Extended: Anti-Exploitation Services (ASLR)
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Requirement Class Requirement Component
the TSF FPT_AEX_EXT.2: Extended: Anti-Exploitation Services (Memory Page
Permissions)
FPT_AEX_EXT.3: Extended: Anti-Exploitation Services (Overflow Protection)
FPT_AEX_EXT.4: Extended: Domain Isolation
FPT_AEX_EXT.6: Extended: Anti-Exploitation Services (Memory Page
Permissions)
FPT_BBD_EXT.1: Extended: Application Processor Mediation
FPT_JTA_EXT.1: Extended: JTAG Disablement
FPT_KST_EXT.1: Extended: Key Storage
FPT_KST_EXT.2: Extended: No Key Transmission
FPT_KST_EXT.3: Extended: No Plaintext Key Export
FPT_NOT_EXT.1: Extended: Self-Test Notification
FPT_STM.1: Reliable time stamps
FPT_TST_EXT.1: Extended: TSF Cryptographic Functionality Testing
FPT_TST_EXT.1/WLAN: Extended: TSF Cryptographic Functionality Testing -
WLAN
FPT_TST_EXT.1/VPN: Extended: TSF Cryptographic Functionality Testing -
VPN
FPT_TST_EXT.2(1): Extended: TSF Integrity Checking
FPT_TST_EXT.2(2): Extended: TSF Integrity Checking
FPT_TUD_EXT.1: Extended: Trusted Update: TSF version query
FPT_TUD_EXT.2: Extended: TSF Update Verification
FTA: TOE access FTA_SSL_EXT.1: Extended: TSF- and User-initiated Locked State
FTA_TAB.1: Default TOE Access Banners
FTA_WSE_EXT.1: Extended: Wireless Network Access - WLAN
FTP_ITC_EXT.1: Extended: Trusted channel Communication
FTP_ITC_EXT.1/WLAN: Extended: Trusted Channel Communication (Wireless
LAN) - WLAN
Table 5 TOE Security Functional Components
5.1.1 Security audit (FAU)
5.1.1.1 Audit Data Generation (FAU_GEN.1)
FAU_GEN.1.1
The TSF shall be able to generate an audit record of the following auditable events:
1. Start-up and shutdown of the audit functions
2. All auditable events for the not selected level of audit
3. All administrative actions
4. Start-up and shutdown of the Rich OS
5. Insertion or removal of removable media
6. Specifically defined auditable events in Table 1 (of the MDFPP31);
7. [Audit records reaching [95%] percentage of audit capacity].
8. [Refinement: Objective audit events from the MDFPP31 as listed in Table 8 Audit Events,
auditable events in Table 2 of WLANCEP10]
]
FAU_GEN.1.2
The TSF shall record within each audit record at least the following information:
1. Date and time of the event
2. type of event
3. subject identity
4. the outcome (success or failure) of the event
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5. additional information in Table 1
6. [no additional information]
(TD0194 applied)
5.1.1.2 Audit Review (FAU_SAR.1)
FAU_SAR.1.1
The TSF shall provide the administrator with the capability to read all audited events and record
contents from the audit records.
FAU_SAR.1.2
The TSF shall provide the audit records in a manner suitable for the user to interpret the
information.
5.1.1.3 Selective Audit (FAU_SEL.1)
FAU_SEL.1.1
The TSF shall be able to select the set of events to be audited from the set of all auditable events
based on the following attributes [
 success of auditable security events;
 failure of auditable security events; and
 [event group, event severity, UserID and kernel events]].
5.1.1.4 Audit Storage Protection (FAU_STG.1)
FAU_STG.1.1
The TSF shall protect the stored audit records in the audit trail from unauthorized deletion.
FAU_STG.1.2
The TSF shall be able to prevent unauthorized modifications to the stored audit records in the
audit trail.
5.1.1.5 Prevention of Audit Data Loss (FAU_STG.4)
FAU_STG.4.1
The TSF shall overwrite the oldest stored audit records if the audit trail is full.
5.1.2 Cryptographic support (FCS)
5.1.2.1 Cryptographic key generation (FCS_CKM.1)
FCS_CKM.1.1
The TSF shall generate asymmetric cryptographic keys in accordance with a specified
cryptographic key generation algorithm [ECC schemes] using [“NIST curves” P-256, P-384, and
[P-521]] that meet the following: [FIPS PUB 186-4, “Digital Signature Standard (DSS)”,
Appendix B.4];
[
- [FFC schemes] using cryptographic key sizes of [2048-bit or greater] that meet the following:
[FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.1]];
- [RSA schemes] using cryptographic key sizes of [2048-bit or greater] that meet the following:
[FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.3]
].
(TD0330 applied)
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5.1.2.2 Cryptographic Key Generation (Symmetric Keys for WPA2 Connections) - WLAN
(FCS_CKM.1/WLAN)
FCS_CKM.1.1/WLAN
Refinement: The TSF shall generate symmetric cryptographic keys in accordance with a specified
cryptographic key generation algorithm PRF-384 and [no other] and specified cryptographic key
sizes 128 bits and [no other key sizes] using a Random Bit Generator as specified in
FCS_RBG_EXT.1 that meet the following: IEEE 802.11-2012 and [IEEE 802.11ac-2014].
5.1.2.3 Cryptographic Key Generation (IKE) - VPN (FCS_CKM.1/VPN)
FCS_CKM.1.1/VPN
The [OS] shall generate asymmetric cryptographic keys used for IKE peer authentication in
accordance with:
- FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.3 for RSA schemes;
- FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.4 for ECDSA schemes
and implementing “NIST curves”, P-256, P-384 and [P-521]]
and specified cryptographic key sizes equivalent to, or greater than, a symmetric key strength of
112 bits.
5.1.2.4 Cryptographic key establishment (FCS_CKM.2(1))
FCS_CKM.2(1).1
The TSF shall perform cryptographic key establishment in accordance with a specified
cryptographic key establishment method:
- RSA-based key establishment schemes that meets the following: NIST Special Publication
800-56B, 'Recommendation for Pair-Wise Key Establishment Schemes Using Integer
Factorization Cryptography'
- Elliptic curve-based key establishment schemes that meets the following: NIST Special
Publication 800-56A, “Recommendation for Pair-Wise Key Establishment Schemes Using
Discrete Logarithm Cryptography”
and [
- Finite field-based key establishment schemes] that meets the following: NIST Special
Publication 800-56A, “Recommendation for Pair-Wise Key Establishment Schemes
Using Discrete Logarithm Cryptography”].
5.1.2.5 Cryptographic key establishment (While device is locked) (FCS_CKM.2(2))
FCS_CKM.2(2).1
The TSF shall perform cryptographic key establishment in accordance with a specified
cryptographic key establishment method: [
Elliptic curve-based key establishment schemes that meets the following: [NIST Special
Publication 800-56A, “Recommendation for Pair-Wise Key Establishment Schemes Using
Discrete Logarithm Cryptography]]
for the purposes of encrypting sensitive data received while the device is locked.
5.1.2.6 Cryptographic Key Distribution (GTK) - WLAN (FCS_CKM.2/WLAN)
FCS_CKM.2.1/WLAN
Refinement: The TSF shall decrypt Group Temporal Key in accordance with a specified
cryptographic key distribution method [AES Key Wrap in an EAPOL-Key frame] that meets the
following:[RFC 3394 for AES Key Wrap, 802.11-2012 for the packet format and timing
considerations] and does not expose the cryptographic keys.
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5.1.2.7 Extended: Cryptographic Key Support (FCS_CKM_EXT.1)
FCS_CKM_EXT.1.1
The TSF shall support a [immutable hardware] REK(s) with a [symmetric] key of strength [256
bits].
FCS_CKM_EXT.1.2
Each REK shall be hardware-isolated from Rich OS on the TSF in runtime.
FCS_CKM_EXT.1.3
Each REK shall be generated by a RBG in accordance with FCS_RBG_EXT.1.
5.1.2.8 Extended: Cryptographic Key Random Generation (FCS_CKM_EXT.2)
FCS_CKM_EXT.2.1
All DEKs shall be [
- randomly generated
] with entropy corresponding to the security strength of AES key sizes of [256] bits.
(TD0351 applied)
5.1.2.9 Extended: Cryptographic Key Generation (FCS_CKM_EXT.3)
FCS_CKM_EXT.3.1
The TSF shall use [asymmetric KEKs of [128-bit] security strength, symmetric KEKs of [256-bit]
security strength corresponding to at least the security strength of the keys encrypted by the
KEK].
FCS_CKM_EXT.3.2
The TSF shall generate all KEKs using one of the following methods:
- derive the KEK from a Password Authentication Factor using according to FCS_COP.1(5).1
and [
- generate the KEK using an RBG that meets this profile (as specified in FCS_RBG_EXT.1),
- generate the KEK using a key generation scheme that meets this profile (as specified in
FCS_CKM.1),
- Combine the KEK from other KEKs in a way that preserves the effective entropy of each
factor by [encrypting one key with another]].
(TD0366 applied)
5.1.2.10 Extended: Key Destruction (FCS_CKM_EXT.4)
FCS_CKM_EXT.4.1
The TSF shall destroy cryptographic keys in accordance with the specified cryptographic key
destruction methods:
- by clearing the KEK encrypting the target key
- in accordance with the following rules
 For volatile memory, the destruction shall be executed by a single direct overwrite
[consisting of zeroes].
 For non-volatile EEPROM, the destruction shall be executed by a single direct overwrite
consisting of a pseudo random pattern using the TSF's RBG (as specified in
FCS_RBG_EXT.1), followed by a read-verify.
 For non-volatile flash memory, that is not wear-leveled, the destruction shall be executed
[by a single direct overwrite consisting of zeros followed by a read-verify].
 For non-volatile flash memory, that is wear-leveled, the destruction shall be executed [by
a block erase].
 For non-volatile memory other than EEPROM and flash, the destruction shall be
executed by a single direct overwrite with a random pattern that is changed before each
write.
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FCS_CKM_EXT.4.2
The TSF shall destroy all plaintext keying material and critical security parameters when no longer
needed.
5.1.2.11 Extended: TSF Wipe (FCS_CKM_EXT.5)
FCS_CKM_EXT.5.1
The TSF shall wipe all protected data by [Cryptographically erasing the encrypted DEKs and/or
the KEKs in non-volatile memory by following the requirements in FCS_CKM_EXT.4.1].
FCS_CKM_EXT.5.2
The TSF shall perform a power cycle on conclusion of the wipe procedure.
5.1.2.12 Extended: Salt Generation (FCS_CKM_EXT.6)
FCS_CKM_EXT.6.1
The TSF shall generate all salts using a RBG that meets FCS_RBG_EXT.1.
5.1.2.13 Cryptographic operation (FCS_COP.1(1))
FCS_COP.1(1).1
The TSF shall perform encryption/decryption in accordance with a specified cryptographic
algorithm:
- AES-CBC (as defined in FIPS PUB 197, and NIST SP 800-38A) mode
- AES-CCMP (as defined in FIPS PUB 197, NIST SP 800-38C and IEEE 802.11-2012),
- AES-GCM (as defined in NIST SP 800-38D), and [
- AES Key Wrap (KW) (as defined in NIST SP 800-38F),
- AES-XTS (as defined in NIST SP 800-38E)]
and cryptographic key sizes 128-bit key sizes and [256-bit key sizes].
5.1.2.14 Cryptographic operation (FCS_COP.1(2))
FCS_COP.1(2).1
The TSF shall perform cryptographic hashing in accordance with a specified cryptographic
algorithm SHA-1 and [SHA-256, SHA-384, SHA-512] and message digest sizes 160 and [256,
384, 512] that meet the following: FIPS Pub 180-4.
5.1.2.15 Cryptographic operation (FCS_COP.1(3))
FCS_COP.1(3).1
The TSF shall perform cryptographic signature services (generation and verification) in
accordance with a specified cryptographic algorithm
- RSA schemes using cryptographic key sizes of 2048-bit or greater that meet the following:
FIPS PUB 186-4, 'Digital Signature Standard (DSS)', Section 4 and [
- ECDSA schemes using 'NIST curves' P-384 and [P-256, P-521] that meet the following:
FIPS PUB 186-4, 'Digital Signature Standard (DSS)', Section 5].
5.1.2.16 Cryptographic operation (FCS_COP.1(4))
FCS_COP.1(4).1
The TSF shall perform keyed-hash message authentication in accordance with a specified
cryptographic algorithm HMAC-SHA-1 and [HMAC-SHA-256, HMAC-SHA-384, HMAC-SHA-
512] and cryptographic key sizes [160, 256, 384, 512-bits] and message digest sizes 160 and [256,
384, 512] bits that meet the following: FIPS Pub 198-1, 'The Keyed-Hash Message Authentication
Code', and FIPS Pub 180-4, 'Secure Hash Standard'.
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5.1.2.17 Cryptographic operation (FCS_COP.1(5))
FCS_COP.1(5).1
The TSF shall perform conditioning in accordance with a specified cryptographic algorithm
[HMAC-[SHA-256, SHA-512]] using a salt, and [PBKDF2 with [4096] iterations], and output
cryptographic key sizes [256] that meet the following: NIST [SP 800-132].
(TD0366 applied)
5.1.2.18 Extended: HTTPS Protocol (FCS_HTTPS_EXT.1)
FCS_HTTPS_EXT.1.1
The TSF shall implement the HTTPS protocol that complies with RFC 2818.
FCS_HTTPS_EXT.1.2
The TSF shall implement HTTPS using TLS (FCS_TLSC_EXT.1).
FCS_HTTPS_EXT.1.3
The TSF shall notify the application and [no other action] if the peer certificate is deemed invalid.
5.1.2.19 Extended: IPsec (FCS_IPSEC_EXT.1)
FCS_IPSEC_EXT.1.1
The [TOE] shall implement the IPsec architecture as specified in RFC 4301.
FCS_IPSEC_EXT.1.2
The [TOE] shall implement [tunnel mode].
FCS_IPSEC_EXT.1.3
The [TOE] shall have a nominal, final entry in the SPD that matches anything that is otherwise
unmatched, and discards it.
FCS_IPSEC_EXT.1.4
The [TOE] shall implement the IPsec protocol ESP as defined by RFC 4303 using the
cryptographic algorithms AES-GCM-128, AES-GCM-256 as specified in RFC 4106, [AES-CBC-
128, AES-CBC-256 (both specified by RFC 3602) together with a Secure Hash Algorithm
(SHA)-based HMAC, no other algorithms].
FCS_IPSEC_EXT.1.5
The [TOE] shall implement the protocol: [
- IKEv1, using Main Mode for Phase I exchanges, as defined in RFCs 2407, 2408, 2409, RFC
4109, [no other RFCs for extended sequence numbers], and [no other RFCs for hash functions]
and [support for XAUTH];
- IKEv2 as defined in RFCs 7296 (with mandatory support for NAT traversal as specified in
section 2.23), 4307, and [no other RFCs for hash functions]].
(TD0303 applied)
FCS_IPSEC_EXT.1.6
The [TOE] shall ensure the encrypted payload in the [IKEv1, IKEv2] protocol uses the
cryptographic algorithms AES-CBC-128, AES-CBC-256 as specified in RFC 6379 and [AES-
GCM-128, AES-GCM-256 as specified in RFC 5282]1
.
FCS_IPSEC_EXT.1.7
The [TOE] shall ensure that [
- IKEv2 SA lifetimes can be configured by [VPN Gateway] based on [length of time];
- IKEv1 SA lifetimes can be configured by [VPN Gateway] based on [length of time]].
If length of time is used, it must include at least one option that is 24 hours or less for Phase 1 SAs
and 8 hours or less for Phase 2 SAs.
FCS_IPSEC_EXT.1.8
The [TOE] shall ensure that all IKE protocols implement DH Groups 14 (2048-bit MODP), 19
1
Note that AES-GCM-128 and AES-GCM-256 are supported only for IKEv2.
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(256-bit Random ECP), 20 (384-bit Random ECP), and [5 (1536-bit MODP), 24 (2048-bit MODP
with 256-bit POS)].
FCS_IPSEC_EXT.1.9
The [TOE] shall generate the secret value x used in the IKE Diffie-Hellman key exchange (“x” in
gx
mod p) using the random bit generator specified in FCS_RBG_EXT.1, and having a length of at
least [(224, 256, or 384)] bits.
FCS_IPSEC_EXT.1.10
The [TOE] shall generate nonces used in IKE exchanges in a manner such that the probability that
a specific nonce value will be repeated during the life a specific IPsec SA is less than 1 in 2^[(112,
128, or 192)].
FCS_IPSEC_EXT.1.11
The [TOE] shall ensure that all IKE protocols perform peer authentication using a [RSA, ECDSA]
that use X.509v3 certificates that conform to RFC 4945 and [Pre-Shared Keys].
FCS_IPSEC_EXT.1.12
The [TOE] shall not establish an SA if the [IP address, Fully Qualified Domain Name (FQDN))]
and [no other reference identifier type] contained in a certificate does not match the expected
value(s) for the entity attempting to establish a connection.
(TD0378 applied)
FCS_IPSEC_EXT.1.13
The [TOE] shall not establish an SA if the presented identifier does not match the configured
reference identifier of the peer.
(TD0378 applied)
FCS_IPSEC_EXT.1.14
The [VPN Gateway] shall be able to ensure by default that the strength of the symmetric algorithm
(in terms of the number of bits in the key) negotiated to protect the [IKEv1 Phase 1, IKEv2
IKE_SA] connection is greater than or equal to the strength of the symmetric algorithm (in terms
of the number of bits in the key) negotiated to protect the [IKEv1 Phase 2, IKEv2 CHILD_SA]
connection.
5.1.2.20 Extended: Initialization Vector Generation (FCS_IV_EXT.1)
FCS_IV_EXT.1.1
The TSF shall generate IVs in accordance with MDFPP31 Table 11: References and IV
Requirements for NIST-approved Cipher Modes.
5.1.2.21 Extended: Cryptographic Operation (Random Bit Generation) (FCS_RBG_EXT.1)
FCS_RBG_EXT.1.1
The TSF shall perform all deterministic random bit generation services in accordance with NIST
Special Publication 800-90A using [Hash_DRBG (any), HMAC_DRBG (any), CTR_DRBG
(AES)].
FCS_RBG_EXT.1.2
The deterministic RBG shall be seeded by an entropy source that accumulates entropy from [TSF-
hardware-based noise source] with a minimum of [256 bits] of entropy at least equal to the
greatest security strength (according to NIST SP 800-57) of the keys and hashes that it will
generate.
FCS_RBG_EXT.1.3
The TSF shall be capable of providing output of the RBG to applications running on the TSF that
request random bits.
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5.1.2.22 Extended: Cryptographic Operation (Random Bit Generation) (FCS_RBG_EXT.2)
FCS_RBG_EXT.2.1
The TSF shall save the state of the deterministic RBG at power-off, and shall use this state as
input to the deterministic RBG at startup.
5.1.2.23 Extended: Cryptographic Algorithm Services (FCS_SRV_EXT.1)
FCS_SRV_EXT.1.1
The TSF shall provide a mechanism for applications to request the TSF to perform the following
cryptographic operations:
- All mandatory and [selected algorithms] in FCS_CKM.2(2)
- The following algorithms in FCS_COP.1(1): AES-CBC, [AES-GCM]
- All mandatory and selected algorithms in FCS_COP.1(3)
- All mandatory and selected algorithms in FCS_COP.1(2)
- All mandatory and selected algorithms in FCS_COP.1(4)
- [No other cryptographic operations].
5.1.2.24 Extended: Cryptographic Algorithm Services (FCS_SRV_EXT.2)
FCS_SRV_EXT.2.1
The TSF shall provide a mechanism for applications to request the TSF to perform the following
cryptographic operations:
- Algorithms in FCS_COP.1(1)
- Algorithms in FCS_COP.1(3)
by keys stored in the secure key storage.
5.1.2.25 Extended: Cryptographic Key Storage (FCS_STG_EXT.1)
FCS_STG_EXT.1.1
The TSF shall provide [software-based] secure key storage for asymmetric private keys and
[symmetric keys].
FCS_STG_EXT.1.2
The TSF shall be capable of importing keys/secrets into the secure key storage upon request of
[the user, the administrator] and [applications running on the TSF].
FCS_STG_EXT.1.3
The TSF shall be capable of destroying keys/secrets in the secure key storage upon request of [the
user].
FCS_STG_EXT.1.4
The TSF shall have the capability to allow only the application that imported the key/secret the
use of the key/secret. Exceptions may only be explicitly authorized by [a common application
developer].
FCS_STG_EXT.1.5
The TSF shall allow only the application that imported the key/secret to request that the key/secret
be destroyed. Exceptions may only be explicitly authorized by [a common application developer].
5.1.2.26 Extended: Encrypted Cryptographic Key Storage (FCS_STG_EXT.2)
FCS_STG_EXT.2.1
The TSF shall encrypt all DEKs and KEKs and [Wi-Fi, Bluetooth, and SecurityLogAgent
properties (related to SE Android)] and [all software-based key storage] by KEKs that are [
1) Protected by the REK with [
a. encryption by a REK,
b. encryption by a KEK that is derived from a REK],
2) Protected by the REK and the password with [
a. encryption by a REK and the password-derived KEK,
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b. encryption by a KEK that is derived from a REK and the password-derived or
biometric-unlocked KEK]].
FCS_STG_EXT.2.2
DEKs, KEKs, [Bluetooth and WPA2 PSK long-term trusted channel key material and
SecurityLogAgent properties (related to SE Android)] and [all software-based key storage] shall
be encrypted using one of the following methods: [using a SP800-56B key establishment scheme,
using AES in the [GCM, CBC mode]].
(TD0369 applied)
5.1.2.27 Extended: Integrity of encrypted key storage (FCS_STG_EXT.3)
FCS_STG_EXT.3.1
The TSF shall protect the integrity of any encrypted DEKs and KEKs and [long-term trusted
channel key material, all software-based key storage] by [
- [GCM] cipher mode for encryption according to FCS_STG_EXT.2
- a hash (FCS_COP.1(2)) of the stored key that is encrypted by a key protected by
FCS_STG_EXT.2
- a keyed hash (FCS_COP.1(4)) using a key protected by a key protected by FCS_STG_EXT.2].
FCS_STG_EXT.3.2
The TSF shall verify the integrity of the [MAC] of the stored key prior to use of the key.
5.1.2.28 Extended: TLS Protocol (FCS_TLSC_EXT.1)
FCS_TLSC_EXT.1.1
The TSF shall implement TLS 1.2 (RFC 5246) supporting the following ciphersuites:
Mandatory Ciphersuites: [
- TLS_RSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5246,
- TLS_RSA_WITH_AES_256_CBC_ SHA256 as defined in RFC 5246]
Optional Ciphersuites: [
- TLS_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5288,
- 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_ECDSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289,
- TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289].
FCS_TLSC_EXT.1.2
The TSF shall verify that the presented identifier matches the reference identifier according to
RFC 6125.
FCS_TLSC_EXT.1.3
The TSF shall not establish a trusted channel if the peer certificate is invalid.
FCS_TLSC_EXT.1.4
The TSF shall support mutual authentication using X.509v3 certificates.
5.1.2.29 Extended: Extensible Authentication Protocol-Transport Layer Security - WLAN
(FCS_TLSC_EXT.1/WLAN)
FCS_TLSC_EXT.1.1/WLAN
The TSF shall implement TLS 1.0 and [TLS 1.1 (RFC 4346), TLS 1.2 (RFC 5246)] in support of
the EAP-TLS protocol as specified in RFC 5216 supporting the following ciphersuites:
Mandatory Ciphersuites in accordance with RFC 5246:
- TLS_RSA_WITH_AES_128_CBC_SHA
Optional Ciphersuites: [
- TLS_RSA_WITH_AES_256_CBC_SHA as defined in RFC 5246,
- 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_SHA as defined in RFC 5246,
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- TLS_DHE_RSA_WITH_AES_256_CBC_SHA 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_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_ECDSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5430,
- TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 as defined in RFC 5430,
- 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_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289,
- TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289].
FCS_TLSC_EXT.1.2/WLAN
The TSF shall generate random values used in the EAP-TLS exchange using the RBG specified in
FCS_RBG_EXT.1.
FCS_TLSC_EXT.1.3/WLAN
The TSF shall use X509 v3 certificates as specified in FIA_X509_EXT.1.
FCS_TLSC_EXT.1.4/WLAN
The TSF shall verify that the server certificate presented includes the Server Authentication
purpose (id-kp 1 with OID 1.3.6.1.5.5.7.3.1) in the extendedKeyUsage field.
FCS_TLSC_EXT.1.5/WLAN
The TSF shall allow an authorized administrator to configure the list of CAs that are allowed to
sign authentication server certificates that are accepted by the TOE.
FCS_TLSC_EXT.1.6/WLAN
The TSF shall allow an authorized administrator to configure the list of algorithm suites that may
be proposed and accepted during the EAP-TLS exchanges.
5.1.2.30 Extended: TLS Protocol (FCS_TLSC_EXT.2)
FCS_TLSC_EXT.2.1
The TSF shall present the Supported Elliptic Curves Extension in the Client Hello handshake
message with the following NIST curves: [secp256r1, secp384r1].
(TD0244 applied)
5.1.2.31 TLS Client Protocol - WLAN (FCS_TLSC_EXT.2/WLAN)
FCS_TLSC_EXT.2.1/WLAN
The TSF shall present the Supported Elliptic Curves Extension in the Client Hello with the
following NIST curves: [secp256r1, secp384r1].
(TD0244 applied).
5.1.3 User data protection (FDP)
5.1.3.1 Extended: Security access control (FDP_ACF_EXT.1)
FDP_ACF_EXT.1.1
The TSF shall provide a mechanism to restrict the system services that are accessible to an
application.
FDP_ACF_EXT.1.2
The TSF shall provide an access control policy that prevents [application, groups of applications]
from accessing [all] data stored by other [application, groups of applications]. Exceptions may
only be explicitly authorized for such sharing by [the administrator, a common application
developer].
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5.1.3.2 Extended: Security access control (FDP_ACF_EXT.2)
FDP_ACF_EXT.2.1
The TSF shall provide a separate [address book, calendar] for each application group and only
allow applications within that process group to access the resource. Exceptions may only be
explicitly authorized for such sharing by [the user].
5.1.3.3 Extended: Security attribute based access control (FDP_ACF_EXT.3)
FDP_ACF_EXT.3.1
The TSF shall enforce an access control policy that prohibits an application from granting both
write and execute permission to a file on the device except for [files stored in the application’s
private data folder].
5.1.3.4 Extended: Protected Data Encryption (FDP_DAR_EXT.1)
FDP_DAR_EXT.1.1
Encryption shall cover all protected data.
FDP_DAR_EXT.1.2
Encryption shall be performed using DEKs with AES in the [CBC, GCM, XTS] mode with key
size [128,256] bits.
5.1.3.5 Extended: Sensitive Data Encryption (FDP_DAR_EXT.2)
FDP_DAR_EXT.2.1
The TSF shall provide a mechanism for applications to mark data and keys as sensitive.
FDP_DAR_EXT.2.2
The TSF shall use an asymmetric key scheme to encrypt and store sensitive data received while
the product is locked.
FDP_DAR_EXT.2.3
The TSF shall encrypt any stored symmetric key and any stored private key of the asymmetric
key(s) used for the protection of sensitive data according to FCS_STG_EXT.2.1 selection 2.
FDP_DAR_EXT.2.4
The TSF shall decrypt the sensitive data that was received while in the locked state upon
transitioning to the unlocked state using the asymmetric key scheme and shall re-encrypt that
sensitive data using the symmetric key scheme.
5.1.3.6 Extended: Subset information flow control (FDP_IFC_EXT.1)
FDP_IFC_EXT.1.1
The TSF shall [provide an interface which allows a VPN client to protect all IP traffic using
IPsec, provide a VPN client which can protect all IP traffic using IPsec] with the exception of IP
traffic required to establish the VPN connection.
5.1.3.7 Extended: Storage of Critical Biometric Parameters (FDP_PBA_EXT.1)
FDP_PBA_EXT.1.1
The TSF shall protect the authentication template [using a password as an additional factor].
5.1.3.8 Full Residual Information Protection (FDP_RIP.2)
FDP_RIP.2.1
The [TOE] shall enforce that any previous information content of a resource is made unavailable
upon the [allocation of the resource to] all objects.
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5.1.3.9 Extended: User Data Storage (FDP_STG_EXT.1)
FDP_STG_EXT.1.1
The TSF shall provide protected storage for the Trust Anchor Database.
5.1.3.10 Extended: Inter-TSF user data transfer protection (FDP_UPC_EXT.1)
FDP_UPC_EXT.1.1
The TSF shall provide a means for non-TSF applications executing on the TOE to use TLS,
HTTPS, Bluetooth BR/EDR, and [Bluetooth LE, IPsec] to provide a protected communication
channel between the non-TSF application and another IT product that is logically distinct from
other communication channels, provides assured identification of its end points, protects channel
data from disclosure, and detects modification of the channel data.
FDP_UPC_EXT.1.2
The TSF shall permit the non-TSF applications to initiate communication via the trusted channel.
5.1.4 Identification and authentication (FIA)
5.1.4.1 Extended: Authentication failure handling (FIA_AFL_EXT.1)
FIA_AFL_EXT.1.1
The TSF shall consider password and [no other] as critical authentication mechanisms.
FIA_AFL_EXT.1.2
The TSF shall detect when a configurable positive integer within [1-30] of [non-unique]
unsuccessful authentication attempts occur related to last successful authentication for each
authentication mechanism.
FIA_AFL_EXT.1.3
The TSF shall maintain the number of unsuccessful authentication attempts that have occurred
upon power off.
FIA_AFL_EXT.1.4
When the defined number of unsuccessful authentication attempts has exceeded the maximum
allowed for a given authentication mechanism, all future authentication attempts will be limited to
other available authentication mechanisms, unless the given mechanism is designated as a critical
authentication mechanism.
FIA_AFL_EXT.1.5
When the defined number of unsuccessful authentication attempts for the last available
authentication mechanism or single critical authentication mechanism has been surpassed, the TSF
shall perform a wipe of all protected data.
FIA_AFL_EXT.1.6
The TSF shall increment the number of unsuccessful authentication attempts prior to notifying the
user that the authentication was unsuccessful.
5.1.4.2 Extended: Bluetooth User Authorization (FIA_BLT_EXT.1)
FIA_BLT_EXT.1.1
The TSF shall require explicit user authorization before pairing with a remote Bluetooth device.
5.1.4.3 Extended: Bluetooth Mutual Authentication (FIA_BLT_EXT.2)
FIA_BLT_EXT.2.1
The TSF shall require Bluetooth mutual authentication between devices prior to any data transfer
over the Bluetooth link.
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5.1.4.4 Extended: Rejection of Duplicate Bluetooth Connections (FIA_BLT_EXT.3)
FIA_BLT_EXT.3.1
The TSF shall discard connection attempts from a Bluetooth device address (BD_ADDR) to
which a current connection already exists.
5.1.4.5 Extended: Secure Simple Pairing (FIA_BLT_EXT.4)
FIA_BLT_EXT.4.1
The TOE shall support Bluetooth Secure Simple Pairing, both in the host and the controller.
Furthermore, Secure Simple Pairing shall be used during the pairing process if the remote device
also supports it.
5.1.4.6 Extended: Bluetooth User Authorization (FIA_BLT_EXT.6)
FIA_BLT_EXT.6.1
The TSF shall require explicit user authorization before granting trusted remote devices access to
services associated with the following Bluetooth profiles: [OPP], and shall require explicit user
authorization before granting untrusted remote devices access to services associated with the
following Bluetooth profiles: [all available Bluetooth profiles].
5.1.4.7 Extended: Accuracy of Biometric Authentication (FIA_BMG_EXT.1(1))
FIA_BMG_EXT.1(1).1
The one-attempt BAF False Accept Rate (FAR) for [fingerprint] shall not exceed [1:10,000] with
a one-attempt BAF False Reject Rate (FRR) not to exceed [3%].
(TD0301 applied)
FIA_BMG_EXT.1(1).2
The overall System Authentication False Accept Rate (SAFAR) shall be no greater than 1 in
[1,000] within a 1% margin.
5.1.4.8 Extended: Accuracy of Biometric Authentication (FIA_BMG_EXT.1(2))
FIA_BMG_EXT.1(2).1
The one-attempt BAF False Accept Rate (FAR) for [hybrid] shall not exceed [1:10,000] with a
one-attempt BAF False Reject Rate (FRR) not to exceed [3%].
(TD0301 applied)
FIA_BMG_EXT.1(2).2
The overall System Authentication False Accept Rate (SAFAR) shall be no greater than 1 in
[1,000,000] within a 1% margin.
5.1.4.9 Port Access Entity Authentication (FIA_PAE_EXT.1)
FIA_PAE_EXT.1.1
The TSF shall conform to IEEE Standard 802.1X for a Port Access Entity (PAE) in the
'Supplicant' role.
5.1.4.10 Extended: Password Management (FIA_PMG_EXT.1)
FIA_PMG_EXT.1.1
The TSF shall support the following for the Password Authentication Factor:
1. Passwords shall be able to be composed of any combination of [upper and lower case letters],
numbers, and special characters: [ ! @ # $ % ^ & * ( ) + = _ / - ' " : ; , ? ` ~ \ | < > { } [ ] ];
2. Password length up to [16] characters shall be supported.
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5.1.4.11 Extended: Pre-Shared Key Composition - VPN (FIA_PSK_EXT.1)
FIA_PSK_EXT.1.1
The [TOE] shall be able to use pre-shared keys for IPsec.
FIA_PSK_EXT.1.2
The [TOE] shall be able to accept text-based pre-shared keys that:
- are 22 characters and [[between 1 and 64 characters]];
- composed of any combination of upper and lower case letters, numbers, and special characters
(that include: '!', '@', '#', '$', '%', '^', '&', '*', '(', and ')').
FIA_PSK_EXT.1.3
The [TOE] shall condition the text-based pre-shared keys by using [[the entered string as ASCII
Hex]], [be able to [accept] bit-based pre-shared keys].
5.1.4.12 Extended: Authentication Throttling (FIA_TRT_EXT.1)
FIA_TRT_EXT.1.1
The TSF shall limit automated user authentication attempts by [enforcing a delay between
incorrect authentication attempts] for all authentication mechanisms selected in FIA_UAU.5.1.
The minimum delay shall be such that no more than 10 attempts can be attempted per 500
milliseconds.
5.1.4.13 Multiple Authentication Mechanisms (FIA_UAU.5)
FIA_UAU.5.1
The TSF shall provide password and [fingerprint, hybrid] to support user authentication.
FIA_UAU.5.2
The TSF shall authenticate any user's claimed identity according to the [following rules:
 Passwords
o Can be used at any time
 Biometric
o Can only be used
 When Work environment is not enabled for the device unlock screen,
 when there is an enrolled biometric,
 when the user enables the allow biometrics for unlock feature,
 the non-critical biometric failed limit has not been reached, and
 at OS unlock screen (not at reboot/power-on screen)
 Hybrid
o For Work environments unlock and hybrid authentication factor configured by
the user
].
5.1.4.14 Re-Authentication (FIA_UAU.6(1))
FIA_UAU.6(1).1
The TSF shall re-authenticate the user via the Password Authentication Factor under the
conditions attempted change to any supported authentication mechanisms.
5.1.4.15 Re-Authentication (FIA_UAU.6(2))
FIA_UAU.6(2).1
The TSF shall re-authenticate the user via an authentication factor defined in FIA_UAU.5.1 under
the conditions TSF-initiated lock, user-initiated lock, [no other conditions].
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5.1.4.16 Protected authentication feedback (FIA_UAU.7)
FIA_UAU.7.1
The TSF shall provide only obscured feedback to the device's display to the user while the
authentication is in progress.
5.1.4.17 Extended: Authentication for Cryptographic Operation (FIA_UAU_EXT.1)
FIA_UAU_EXT.1.1
The TSF shall require the user to present the Password Authentication Factor prior to decryption
of protected data and encrypted DEKs, KEKs and [long-term trusted channel key material, all
software-based key storage] at startup.
5.1.4.18 Extended: Timing of Authentication (FIA_UAU_EXT.2)
FIA_UAU_EXT.2.1
The TSF shall allow [[enter password or supply biometric authentication factor to unlock, make
emergency calls, receive calls, take pictures and screen shots (automatically named and stored
internally by the TOE), see notifications, configure sound/vibrate/mute, set the volume (up and
down) for various sound categories, see the configured banner, access Notification Panel
functions (including toggles Always on Display, Flashlight, Do not disturb toggle, Airplane
mode, Power saving, Auto rotate, and Sound (on, mute, vibrate) and access user configured
Edge applications]] on behalf of the user to be performed before the user is authenticated.
FIA_UAU_EXT.2.2
The TSF shall require each user to be successfully authenticated before allowing any other TSF-
mediated actions on behalf of that user.
5.1.4.19 Extended: Secondary User Authentication (FIA_UAU_EXT.4)
FIA_UAU_EXT.4.1
The TSF shall provide a secondary authentication mechanism for accessing Enterprise
applications and resources. The secondary authentication mechanism shall control access to the
Enterprise application and shared resources and shall be incorporated into the encryption of
protected and sensitive data belonging to Enterprise applications and shared resources.
FIA_UAU_EXT.4.2
The TSF shall require the user to present the secondary authentication factor prior to decryption of
Enterprise application data and Enterprise shared resource data.
5.1.4.20 Extended: Validation of certificates (FIA_X509_EXT.1)
FIA_X509_EXT.1.1
The TSF shall validate certificates in accordance with the following rules:
- RFC 5280 certificate validation and certificate path validation
- The certificate path must terminate with a certificate in the Trust Anchor Database
- The TSF shall validate a certificate path by ensuring the presence of the basicConstraints
extension and that the CA flag is set to TRUE for all CA certificates
- The TSF shall validate the revocation status of the certificate using [the Online Certificate
Status Protocol (OCSP) as specified in RFC 2560 (for TLS, HTTPS, IPsec), a Certificate
Revocation List (CRL) as specified in RFC 5759(for TLS, HTTPS)]
- The TSF shall validate the extendedKeyUsage field according to the following rules:
o 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
o 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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o (Conditional) Server certificates presented for EST shall have the CMC Registration
Authority (RA) purpose (id-kp-cmcRA with OID 1.3.6.1.5.5.7.3.28) 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.
5.1.4.21 Extended: X509 certificate authentication (FIA_X509_EXT.2)
FIA_X509_EXT.2.1
The TSF shall use X.509v3 certificates as defined by RFC 5280 to support authentication for
IPsec, and [TLS, HTTPS], and [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 [not accept the certificate].
5.1.4.22 Extended: X.509 Certificate Authentication (EAP-TLS) - WLAN (FIA_X509_EXT.2/WLAN)
FIA_X509_EXT.2.1/WLAN
The TSF shall use X.509v3 certificates as defined by RFC 5280 to support authentication for
EAP-TLS exchanges.
FIA_X509_EXT.2.2/WLAN
When the TSF cannot establish a connection to determine the validity of a certificate, the TSF
shall [accept the certificate].
5.1.4.23 Extended: Request Validation of certificates (FIA_X509_EXT.3)
FIA_X509_EXT.3.1
The TSF shall provide a certificate validation service to applications.
FIA_X509_EXT.3.2
The TSF shall respond to the requesting application with the success or failure of the validation.
5.1.5 Security management (FMT)
5.1.5.1 Extended: Management of security functions behavior (FMT_MOF_EXT.1)
FMT_MOF_EXT.1.1
The TSF shall restrict the ability to perform the functions in column 3 of Table 6 Security
Management Functions to the user.
FMT_MOF_EXT.1.2
The TSF shall restrict the ability to perform the functions in column 5 of Table 6 Security
Management Functions to the administrator when the device is enrolled and according to the
administrator-configured policy.
5.1.5.2 Extended: Specification of Management Functions (FMT_SMF_EXT.1)
FMT_SMF_EXT.1.1
The TSF shall be capable of performing the functions: in column 2 of Table 6 Security
Management Functions.
5.1.5.3 Extended: Specification of Management Functions - WLAN (FMT_SMF_EXT.1/WLAN)
FMT_SMF_EXT.1.1/WLAN
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The TSF shall be capable of performing the following management functions in rows 48-55 of
Table 6 Security Management Functions
5.1.5.4 Specification of Management Functions - VPN (FMT_SMF.1/VPN)
FMT_SMF.1.1/VPN
The TSF shall be capable of performing the following management functions in rows 56-61 of
Table 6 Security Management Functions
Management Function
FMT_SMF_EXT.1.1
FMT_MOF_EXT.1.1
Admin
FMT_MOF_EXT.1.2
1. configure password policy:
a. minimum password length
b. minimum password complexity
c. maximum password lifetime
The administrator can configure the required password characteristics
(minimum length, complexity, and lifetime) using the Android MDM APIs.
There are distinct settings for the passwords used to unlock the base device
and Knox Workspace container.
Length: an integer value of characters (0 = no minimum)
Complexity: Unspecified, Something, Numeric, Alphabetic, Alphanumeric,
Complex.
Lifetime: an integer value of days (0 = no maximum)
M M M
2. configure session locking policy:
a. screen-lock enabled/disabled
b. screen lock timeout
c. number of authentication failures
The administrator can configure the session locking policy using the Android
MDM APIs. There are distinct settings for base device and Knox Workspace
container inactivity.
The user can also adjust each of the session locking policies for the base
device and Knox Workspace container; however, if set by the administrator,
the user can only set a more strict policy (e.g., setting the device to allow
fewer authentication failures than configured by the administrator).
Screen lock timeout: an integer number of minutes before the TOE locks (0 =
no lock timeout)
Authentication failures: an integer number (0 = no limit)
M M M
3. enable/disable the VPN protection:
a. across device
[
M I I
Status Markers:
M – Mandatory
I – Implemented optional
function
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FMT_MOF_EXT.1.1
Admin
FMT_MOF_EXT.1.2
b. on a per-app basis,
c. on a per-group of applications processes basis
]
The user can configure and then enable the TOE’s VPN to protect traffic
across the entire device.
The administrator (through an MDM Agent that utilizes the TOE’s MDM
APIs) can restrict the TOE’s ability to connect to a VPN.
The administrator can configure per-app and per-container VPN connections
with the Knox Workspace MDM APIs.
4. enable/disable [Bluetooth, Wi-Fi, and cellular radios]
The administrator can disable the radios using the TOE’s MDM APIs. Once
disabled, a user cannot enable the radio. The administrator cannot fully
disable/restrict cellular voice capabilities. The TOE’s radios operate at
frequencies of 2.4 GHz (Bluetooth), 2.4/5 GHz (Wi-Fi), and 850 MHz
(4G/LTE).
M I I
5. enable/disable [camera, microphone]:
a. across device
[ d. no other method]
An administrator may configure the TOE (through an MDM agent utilizing
the TOE’s MDM APIs) to turn off the camera and or microphones. If the
administrator has disabled either the camera or the microphones, then the
user cannot use those capture devices.
The administrator can also disable the use of the camera or microphone
inside a Knox Workspace container without affecting access to those devices
when outside the container.
M I I
6. transition to the locked state
Both users and administrators (using the TOE’s MDM APIs) can transition the
TOE into a locked state.
M M -
7. TSF wipe of protected data
Both users and administrators (using the TOE’s MDM APIs) can force the TOE
to perform a full wipe (factory reset) of data.
M M
8. configure application installation policy by:
a. restricting the sources of applications
M M M
Status Markers:
M – Mandatory
I – Implemented optional
function
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FMT_MOF_EXT.1.1
Admin
FMT_MOF_EXT.1.2
[b. specifying a set of allowed applications based on [application name,
developer signature] (an application whitelist)
c. denying installation of applications]
The administrator using the TOE’s MDM APIs can configure the TOE so that
applications cannot be installed and can also block the use of the Google
Market Place. There are distinct settings for disabling the installation of
applications for the base device and Knox Workspace container.
9. import keys/secrets into the secure key storage
Both users and administrators (using the TOE’s MDM APIs) can import secret
keys into the secure key storage.
M I
10. destroy imported keys/secrets and [no other keys/secrets] in the secure
key storage
Both users and administrators (using the TOE’s MDM APIs) can destroy
secret keys in the secure key storage.
M I
11. import X.509v3 certificates into the Trust Anchor Database
Both users and administrators (using the TOE’s MDM APIs) can import
X.509v3 certificates into the Trust Anchor Database (note that the container
does not have a separate TAD, but instead shares the TAD of the mobile
device).
M M
12. remove imported X.509v3 certificates and [default X.509v3 certificates]
in the Trust Anchor Database
Both users and administrators (using the TOE’s MDM APIs) can remove
imported X.509v3 certificates from the Trust Anchor Database as well as
disable any of the TOE’s default Root CA certificates (in the latter case, the
CA certificate still resides in the TOE’s read-only system partition; however,
the TOE will treat that Root CA certificate and any certificate chaining to it as
untrusted).
M I
13. enroll the TOE in management
TOE users can enroll the TOE in management according to the instructions
specific to a given MDM. Presumably any enrollment would involve at least
some user functions (e.g., install an MDM agent application) on the TOE
prior to enrollment.
M M
14. remove applications
Both users and administrators (using the TOE’s MDM APIs) can uninstall user
M M
Status Markers:
M – Mandatory
I – Implemented optional
function
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FMT_MOF_EXT.1.1
Admin
FMT_MOF_EXT.1.2
and administrator installed applications on the TOE (non-container) and
applications inside a Knox Workspace container.
15. update system software
Users can check for updates and cause the device to update if an update is
available. An administrator can use MDM APIs to query the version of the
TOE and query the installed applications and an MDM agent on the TOE
could issue pop-ups, initiate updates, block communication, etc. until any
necessary updates are completed. Note that the system software covers the
entire mobile device (including all container software).
M M
16. install applications
Both users and administrators (using the TOE’s MDM APIs) can install
applications on the TOE (non-container) and applications inside a Knox
Workspace container.
M M
17. remove Enterprise applications
Both users and administrators (using the TOE’s MDM APIs) can uninstall user
and administrator installed applications on the TOE (non-container) and
applications inside a Knox Workspace container. Applications installed
within the Knox Workspace are marked as Enterprise (Work) applications
M M
18. configure the Bluetooth trusted channel:
a. disable/enable the Discoverable mode (for BR/EDR)
b. change the Bluetooth device name
[ k. no other Bluetooth configuration),]
TOE users can enable Bluetooth discoverable mode for a short period of
time and can also change the device name which is used for the Bluetooth
name. Bluetooth profiles (not services) can be managed on the device by
the administrator. The administrator can restrict only items a and e.
M
19. enable/disable display notification in the locked state of: [
f. all notifications]
TOE users can configure the TOE to allow or disallow notifications while in a
locked state.
M
20. enable data-at rest protection
The TOE meets this management function in the sense that the TOE always
encrypts data-at-rest. Devices shipping with Android 6.0 or higher encrypt
the user data partition by default and one cannot disable the encryption.
This device behavior matches the administrator enabling data-at-rest
M I I
Status Markers:
M – Mandatory
I – Implemented optional
function
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FMT_SMF_EXT.1.1
FMT_MOF_EXT.1.1
Admin
FMT_MOF_EXT.1.2
protection and then preventing the user from altering it.
21. enable removable media’s data-at-rest protection
The administrator (using the TOE’s MDM APIs) can configure a device
removable media encryption policy. Once enabled, the device will prompt a
user to encrypt a newly inserted external SD cards (and the device will then
encrypt any files present after which the device can use the SD Card). If the
user chooses not to encrypt the newly inserted external SD card, then the
device cannot access the SD Card. If the administrator has set the policy to
force encrypt removable media, then the settings option to decrypt the SD
Card is greyed out and the user cannot decrypt the SD Card.
M I I
22. enable/disable location services:
a. across device
[ d. no other method]
The administrator (using the TOE’s MDM APIs) can disable location services.
Unless disabled by the administrator, TOE users can enable and disable
location services.
M I I
23. enable/disable the use of [Fingerprint, Hybrid Authentication]
The TOE supports disabling Biometric authentication for the both the TOE’s
normal device lockscreen and for the TOE’s KNOX container lockscreen. The
TOE’s normal device lockscreen supports fingerprint, which the
administrator can disable. The TOE’s KNOX container supports hybrid
authentication (combination of password and fingerprints), which the
administrator can also disable.
M I I
24. enable/disable all data signaling over [assignment: list of externally
accessible hardware ports]
25. enable/disable [Wi-Fi tethering, USB tethering, and Bluetooth
tethering]2
The administrator (using the TOE’s MDM APIs) can individually disable each
tethering method.
Unless disabled by the administrator, TOE users can individually enable and
disable tethering via a Wi-Fi hotspot, USB connection, and Bluetooth pairing.
The TOE acts as a server (acting as an access point, a USB Ethernet adapter,
I I I
2
Not all devices support all (or any) options for tethering. Many carriers require additional subscriptions/payments
to enable tethering features on the device.
Status Markers:
M – Mandatory
I – Implemented optional
function
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Admin
FMT_MOF_EXT.1.2
and as a Bluetooth Ethernet adapter respectively) in order to share its
network connection with another device.
26. enable/disable developer modes
The administrator (using the TOE’s MDM APIs) can disable Developer Mode.
Unless disabled by the administrator, TOE users can enable and disable
Developer Mode.
I I I
27. enable/disable bypass of local user authentication I I I
28. wipe Enterprise data
The TOE container provides the ability to remove only Enterprise data versus
user data.
I
29. approve [import] by applications of X.509v3 certificates in the Trust
Anchor Database
The TOE will prompt the User to approve requests by an application to
import an X.509v3 CA Certificate into the TOE’s Trust Anchor Database. The
User, when prompted, can allow or deny the import.
30. configure whether to establish a trusted channel or disallow
establishment if the TSF cannot establish a connection to determine the
validity of a certificate
31. enable/disable the cellular protocols used to connect to cellular network
base stations
32. read audit logs kept by the TSF
The administrator (using MDM APIs) can view the TOE’s audit records.
I I
33. configure [selection: certificate, public-key] used to validate digital
signature on applications
34. approve exceptions for shared use of keys/secrets by multiple
applications
35. approve exceptions for destruction of keys/secrets by applications that
did not import the key/secret
36. configure the unlock banner
The administrator (using the TOE’s MDM APIs) can defined a banner of a
maximum of 256 characters to be displayed while the TOE is locked. There is
no method for the user to change the banner.
I I I
37. configure the auditable items I I I
38. retrieve TSF-software integrity verification values
39. enable/disable [ I I I
Status Markers:
M – Mandatory
I – Implemented optional
function
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Management Function
FMT_SMF_EXT.1.1
FMT_MOF_EXT.1.1
Admin
FMT_MOF_EXT.1.2
a. USB mass storage mode]
The administrator (using the TOE’s MDM APIs) can disable USB mass storage
mode.
40. enable/disable backup of [selection: all applications, selected
applications, selected groups of applications, configuration data] to
[selection: local system, remote system]
41. enable/disable [
a. Hotspot functionality authenticated by [pre-shared key],
b. USB tethering authenticated by [no authentication]]
The administrator (using the TOE’s MDM APIs) can disable the Wi-Fi hotspot
and USB tethering.
Unless disabled by the administrator, TOE users can configure the Wi-Fi
hotspot with a pre-shared key and can configure USB tethering (with no
authentication).
I I I
42. approve exceptions for sharing data between [groups of application
processes]
The TOE container provides separation between groups of application
processes along with the ability to control the ability to share data between
these groups
I I
43. place applications into application process groups based on [assignment:
enterprise configuration settings]
44. unenroll the TOE from management I I I
45. Enable/disable the Always On VPN protection
Android’s DPM API of setAlwaysOnVpnPackage allows an MDM Agent acting
as either a device or profile owner to configure an always-on VPN
connection through a specific VPN application for the current user.
I I I
46. Revoke Biometric template
47. [enable/disable USB host storage
disable CC Mode
enable/disable Admin removal
enable/disable manual Date/Time changes
enable/disable applications (including pre-installed)
enable/disable auto-completion of browser text input
configure whitelist/blacklist of allowed email accounts]
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Status Markers:
M – Mandatory
I – Implemented optional
function
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FMT_SMF_EXT.1.1
FMT_MOF_EXT.1.1
Admin
FMT_MOF_EXT.1.2
The user can always disable CC Mode by entirely wiping the device (factory
reset), as this will return the phone to its factory state (in which CC Mode
has not been enabled)
FMT_SMF_EXT.1(1)/WLAN
48. configure security policy for each wireless network:
a. [specify the CA(s) from which the TSF will accept WLAN
authentication server certificate(s)]
b. security type
c. authentication protocol
d. client credentials to be used for authentication;
M M I
49. specify wireless networks (SSIDs) to which the TSF may connect; I I I
50. enable/disable certificate revocation list checking;
51. disable ad hoc wireless client-to-client connection capability;
52. disable wireless network bridging capability (for example, bridging a
connection between the WLAN and cellular radios on a smartphone so it
can function as a hotspot);
53. disable roaming capability
54. enable/disable IEEE 802.1X pre-authentication
55. enable/disable and configure PMK caching
a. set the amount of time (in minutes) for which PMK entries are
cached
b. set the maximum number of PMK entries that can be cached
FMT_SMF.1/VPN
56. Specify VPN gateways to use for connections I
57. Specify IPsec VPN Clients to use for connections
58. Specify IPsec-capable network devices to use for connections
59. Specify client credentials to be used for connections M
60. Configure the reference identifier of the peer M
61. [any additional VPN management functions]
Table 6 Security Management Functions
5.1.5.5 Extended: Specification of Remediation Actions (FMT_SMF_EXT.2)
FMT_SMF_EXT.2.1
The TSF shall offer [wipe of protected data, wipe of sensitive data, remove Enterprise
applications, remove all device-stored Enterprise resource data, remove Enterprise secondary
authentication data] upon unenrollment and [no other triggers].
Status Markers:
M – Mandatory
I – Implemented optional
function
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(TD0346 applied)
5.1.5.6 Extended: Current Administrator (FMT_SMF_EXT.3)
FMT_SMF_EXT.3.1
The TSF shall provide a mechanism that allows users to view a list of currently authorized
administrators and the management functions that each administrator is authorized to perform.
5.1.6 Protection of the TSF (FPT)
5.1.6.1 Extended: Anti-Exploitation Services (ASLR) (FPT_AEX_EXT.1)
FPT_AEX_EXT.1.1
The TSF shall provide address space layout randomization ASLR to applications.
FPT_AEX_EXT.1.2
The base address of any user-space memory mapping will consist of at least 8 unpredictable bits.
5.1.6.2 Extended: Anti-Exploitation Services (Memory Page Permissions) (FPT_AEX_EXT.2)
FPT_AEX_EXT.2.1
The TSF shall be able to enforce read, write, and execute permissions on every page of physical
memory.
5.1.6.3 Extended: Anti-Exploitation Services (Overflow Protection) (FPT_AEX_EXT.3)
FPT_AEX_EXT.3.1
TSF processes that execute in a non-privileged execution domain on the application processor
shall implement stack-based buffer overflow protection.
5.1.6.4 Extended: Domain Isolation (FPT_AEX_EXT.4)
FPT_AEX_EXT.4.1
The TSF shall protect itself from modification by untrusted subjects.
FPT_AEX_EXT.4.2
The TSF shall enforce isolation of address space between applications.
5.1.6.5 Extended: Anti-Exploitation Services (Memory Page Permissions) (FPT_AEX_EXT.6)
FPT_AEX_EXT.6.1
The TSF shall prevent write and execute permissions from being simultaneously granted to any
page of physical memory [excluding memory used for JIT (just-in-time) compilation and
memory allocated with mmap].
5.1.6.6 Extended: Application Processor Mediation (FPT_BBD_EXT.1)
FPT_BBD_EXT.1.1
The TSF shall prevent code executing on any baseband processor (BP) from accessing application
processor (AP) resources except when mediated by the AP.
5.1.6.7 Extended: JTAG Disablement (FPT_JTA_EXT.1)
FPT_JTA_EXT.1.1
The TSF shall [control access by a signing key] to JTAG.
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5.1.6.8 Extended: Key Storage (FPT_KST_EXT.1)
FPT_KST_EXT.1.1
The TSF shall not store any plaintext key material in readable non-volatile memory.
5.1.6.9 Extended: No Key Transmission (FPT_KST_EXT.2)
FPT_KST_EXT.2.1
The TSF shall not transmit any plaintext key material outside the security boundary of the TOE.
5.1.6.10 Extended: No Plaintext Key Export (FPT_KST_EXT.3)
FPT_KST_EXT.3.1
The TSF shall ensure it is not possible for the TOE user(s) to export plaintext keys.
5.1.6.11 Extended: Self-Test Notification (FPT_NOT_EXT.1)
FPT_NOT_EXT.1.1
The TSF shall transition to non-operational mode and [force User authentication failure] when
the following types of failures occur:
- failures of the self-test(s)
- TSF software integrity verification failures
- [no other failures].
5.1.6.12 Reliable time stamps (FPT_STM.1)
FPT_STM.1.1
The TSF shall be able to provide reliable time stamps for its own use.
5.1.6.13 Extended: TSF Cryptographic Functionality Testing (FPT_TST_EXT.1)
FPT_TST_EXT.1.1
The TSF shall run a suite of self-tests during initial start-up (on power on) to demonstrate the
correct operation of all cryptographic functionality.
5.1.6.14 Extended: TSF Cryptographic Functionality Testing - WLAN (FPT_TST_EXT.1/WLAN)
FPT_TST_EXT.1.1/WLAN
The [TOE platform] shall run a suite of self-tests during initial start-up (on power on) to
demonstrate the correct operation of the TSF.
FPT_TST_EXT.1.2/WLAN
The [TOE platform] shall provide the capability to verify the integrity of stored TSF executable
code when it is loaded for execution through the use of the TSF-provided cryptographic services.
5.1.6.15 Extended: TSF Self Test - VPN (FPT_TST_EXT.1/VPN)
FPT_TST_EXT.1.1/VPN
The [TOE Platform] shall run a suite of self -tests during initial start-up (on power on) to
demonstrate the correct operation of the TSF.
FPT_TST_EXT.1.2/VPN
The [TOE Platform] shall provide the capability to verify the integrity of stored TSF executable
code when it is loaded for execution through the use of the [cryptographic signature and hash
for integrity].
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5.1.6.16 Extended: TSF Integrity Checking (FPT_TST_EXT.2(1))
FPT_TST_EXT.2(1).1
The TSF shall verify the integrity of the bootchain up through the Application Processor OS
kernel stored in mutable media prior to its execution through the use of [an immutable hardware
hash of an asymmetric key].
5.1.6.17 Extended: TSF Integrity Checking (FPT_TST_EXT.2(2))
FPT_TST_EXT.2(2).1
The TSF shall verify the integrity of [[the /system partition]], stored in mutable media prior to its
execution through the use of [hardware-protected hash].
5.1.6.18 Extended: Trusted Update: TSF version query (FPT_TUD_EXT.1)
FPT_TUD_EXT.1.1
The TSF shall provide authorized users the ability to query the current version of the TOE
firmware/software.
FPT_TUD_EXT.1.2
The TSF shall provide authorized users the ability to query the current version of the hardware
model of the device.
FPT_TUD_EXT.1.3
The TSF shall provide authorized users the ability to query the current version of installed mobile
applications.
5.1.6.19 Extended: TSF Update Verification (FPT_TUD_EXT.2)
FPT_TUD_EXT.2.1
The TSF shall verify software updates to the Application Processor system software and
[[communications processor software, bootloader software, carrier specific configuration]]
using a digital signature verified by the manufacturer trusted key prior to installing those updates.
FPT_TUD_EXT.2.2
The TSF shall [update only by verified software] the TSF boot integrity [key, hash].
FPT_TUD_EXT.2.3
The TSF shall verify that the digital signature verification key used for TSF updates [matches an
immutable hardware public key].
FPT_TUD_EXT.2.4
The TSF shall verify mobile application software using a digital signature mechanism prior to
installation.
5.1.7 TOE access (FTA)
5.1.7.1 Extended: TSF- and User-initiated Locked State (FTA_SSL_EXT.1)
FTA_SSL_EXT.1.1
The TSF shall transition to a locked state after a time interval of inactivity.
FTA_SSL_EXT.1.2
The TSF shall transition to a locked state after initiation by either the user or the administrator.
FTA_SSL_EXT.1.3
The TSF shall, upon transitioning to the locked state, perform the following operations:
a. clearing or overwriting display devices, obscuring the previous contents;
b. [no other actions].
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5.1.7.2 Default TOE Access Banners (FTA_TAB.1)
FTA_TAB.1.1
Before establishing a user session, the TSF shall display an advisory warning message regarding
unauthorized use of the TOE.
5.1.7.3 Wireless Network Access (FTA_WSE_EXT.1)
FTA_WSE_EXT.1.1
The TSF shall be able to attempt connections only to wireless networks specified as acceptable
networks as configured by the administrator in FMT_SMF_EXT.1.1/WLAN.
5.1.8 Trusted path/channels (FTP)
5.1.8.1 Extended: Trusted channel Communication (FTP_ITC_EXT.1)
FTP_ITC_EXT.1.1
The TSF shall use 802.11-2012, 802.1X, and EAP-TLS, IPsec and [TLS, HTTPS] protocol to
provide a communication channel between itself and another trusted IT product that is logically
distinct from other communication channels, provides assured identification of its end points,
protects channel data from disclosure, and detects modification of the channel data.
FTP_ITC_EXT.1.2
The TSF shall permit the TSF to initiate communication via the trusted channel.
FTP_ITC_EXT.1.3
The TSF shall initiate communication via the trusted channel for wireless access point
connections, administrative communication, configured enterprise connections, and [no other
connections].
5.1.8.2 Trusted Channel Communication - WLAN (FTP_ITC_EXT.1/WLAN)
FTP_ITC_EXT.1.1/WLAN
The TSF shall use 802.11-2012, 802.1X, and EAP-TLS to provide a trusted communication
channel between itself and a wireless access point that is logically distinct from other
communication channels, provides assured identification of its end points, protects channel data
from disclosure, and detects modification of the channel data.
FTP_ITC_EXT.1.2/WLAN
The TSF shall initiate communication via the trusted channel for wireless access point
connections.
5.2 TOE Security Assurance Requirements
The SARs for the TOE are the EAL 1 augmented with ALC_TSU_EXT.1 components as specified in Part 3 of the
Common Criteria. Note that the SARs have effectively been refined with the assurance activities explicitly defined
in association with both the SFRs and SARs.
Requirement Class Requirement Component
ADV: Development ADV_FSP.1: Basic Functional Specification
AGD: Guidance documents
AGD_OPE.1: Operational User Guidance
AGD_PRE.1: Preparative Procedures
ALC: Life-cycle support
ALC_CMC.1: Labelling of the TOE
ALC_CMS.1: TOE CM Coverage
ALC_TSU_EXT.1: Timely Security Updates
ATE: Tests ATE_IND.1: Independent Testing - sample
AVA: Vulnerability assessment AVA_VAN.1: Vulnerability Survey
Table 7 EAL 1 augmented with ALC_TSU_EXT.1 Assurance Components
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5.2.1 Development (ADV)
5.2.1.1 Basic Functional Specification (ADV_FSP.1)
ADV_FSP.1.1d
The developer shall provide a functional specification.
ADV_FSP.1.2d
The developer shall provide a tracing from the functional specification to the SFRs.
ADV_FSP.1.1c
The functional specification shall describe the purpose and method of use for each SFR-enforcing
and SFR-supporting TSFI.
ADV_FSP.1.2c
The functional specification shall identify all parameters associated with each SFR-enforcing and
SFR-supporting TSFI.
ADV_FSP.1.3c
The functional specification shall provide rationale for the implicit categorization of interfaces as
SFR-non-interfering.
ADV_FSP.1.4c
The tracing shall demonstrate that the SFRs trace to TSFIs in the functional specification.
ADV_FSP.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
ADV_FSP.1.2e
The evaluator shall determine that the functional specification is an accurate and complete
instantiation of the SFRs.
5.2.2 Guidance documents (AGD)
5.2.2.1 Operational User Guidance (AGD_OPE.1)
AGD_OPE.1.1d
The developer shall provide operational user guidance.
AGD_OPE.1.1c
The operational user guidance shall describe, for each user role, the user-accessible functions and
privileges that should be controlled in a secure processing environment, including appropriate
warnings.
AGD_OPE.1.2c
The operational user guidance shall describe, for each user role, how to use the available interfaces
provided by the TOE in a secure manner.
AGD_OPE.1.3c
The operational user guidance shall describe, for each user role, the available functions and
interfaces, in particular all security parameters under the control of the user, indicating secure
values as appropriate.
AGD_OPE.1.4c
The operational user guidance shall, for each user role, clearly present each type of security-
relevant event relative to the user-accessible functions that need to be performed, including
changing the security characteristics of entities under the control of the TSF.
AGD_OPE.1.5c
The operational user guidance shall identify all possible modes of operation of the TOE (including
operation following failure or operational error), their consequences, and implications for
maintaining secure operation.
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AGD_OPE.1.6c
The operational user guidance shall, for each user role, describe the security measures to be
followed in order to fulfill the security objectives for the operational environment as described in
the ST.
AGD_OPE.1.7c
The operational user guidance shall be clear and reasonable.
AGD_OPE.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
5.2.2.2 Preparative Procedures (AGD_PRE.1)
AGD_PRE.1.1d
The developer shall provide the TOE, including its preparative procedures.
AGD_PRE.1.1c
The preparative procedures shall describe all the steps necessary for secure acceptance of the
delivered TOE in accordance with the developer's delivery procedures.
AGD_PRE.1.2c
The preparative procedures shall describe all the steps necessary for secure installation of the TOE
and for the secure preparation of the operational environment in accordance with the security
objectives for the operational environment as described in the ST.
AGD_PRE.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
AGD_PRE.1.2e
The evaluator shall apply the preparative procedures to confirm that the TOE can be prepared
securely for operation.
5.2.3 Life-cycle support (ALC)
5.2.3.1 Labelling of the TOE (ALC_CMC.1)
ALC_CMC.1.1d
The developer shall provide the TOE and a reference for the TOE.
ALC_CMC.1.1c
The TOE shall be labelled with its unique reference.
ALC_CMC.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
5.2.3.2 TOE CM Coverage (ALC_CMS.1)
ALC_CMS.1.1d
The developer shall provide a configuration list for the TOE.
ALC_CMS.1.1c
The configuration list shall include the following: the TOE itself; and the evaluation evidence
required by the SARs.
ALC_CMS.1.2c
The configuration list shall uniquely identify the configuration items.
ALC_CMS.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
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5.2.3.3 Timely Security Updates (ALC_TSU_EXT.1)
ALC_TSU_EXT.1.1d
The developer shall provide a description in the TSS of how timely security updates are made to
the TOE.
ALC_TSU_EXT.1.1c
The description shall include the process for creating and deploying security updates for the TOE
software.
ALC_TSU_EXT.1.2c
The description shall express the time window as the length of time, in days, between public
disclosure of a vulnerability and the public availability of security updates to the TOE.
ALC_TSU_EXT.1.3c
The description shall include the mechanisms publicly available for reporting security issues
pertaining to the TOE.
ALC_TSU_EXT.1.4c
The description shall include where users can seek information about the availability of new
updates including details (e.g. CVE identifiers) of the specific public vulnerabilities corrected by
each update.
ALC_TSU_EXT.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
5.2.4 Tests (ATE)
5.2.4.1 Independent Testing - sample (ATE_IND.1)
ATE_IND.1.1d
The developer shall provide the TOE for testing.
ATE_IND.1.1c
The TOE shall be suitable for testing.
ATE_IND.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
ATE_IND.1.2e
The evaluator shall test a subset of the TSF to confirm that the TSF operates as specified.
5.2.5 Vulnerability assessment (AVA)
5.2.5.1 Vulnerability Survey (AVA_VAN.1)
AVA_VAN.1.1d
The developer shall provide the TOE for testing.
AVA_VAN.1.1c
The TOE shall be suitable for testing.
AVA_VAN.1.1e
The evaluator shall confirm that the information provided meets all requirements for content and
presentation of evidence.
AVA_VAN.1.2e
The evaluator shall perform a search of public domain sources to identify potential vulnerabilities
in the TOE.
AVA_VAN.1.3e
The evaluator shall conduct penetration testing, based on the identified potential vulnerabilities, to
determine that the TOE is resistant to attacks performed by an attacker possessing Basic attack
potential.
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6. TOE Summary Specification
This chapter describes the security functions:
 Security audit
 Cryptographic support
 User data protection
 Identification and authentication
 Security management
 Protection of the TSF
 TOE access
 Trusted path/channels
6.1 Security audit
FAU_GEN.1: The following table enumerates the events that the TOE audits. Requirements marked with “(O)” are
from the Table 2: Additional Auditable Events of the MDFPP31.
Requirement Audit Event Content
FAU_GEN.1 Start-up and shutdown of the audit
functions
FAU_GEN.1 All administrative actions
FAU_GEN.1 Start-up and shutdown of the OS and
kernel
FAU_GEN.1 Insertion or removal of removable media
FAU_GEN.1 Establishment of a synchronizing
connection
FAU_GEN.1 Reaching the configured audit log
critical size limit
FCS_CKM.1 Failure of key generation activity for
authentication keys.
FCS_CKM_EXT.5 Failure of the wipe.
FCS_HTTPS_EXT.1 (O) Failure of the certificate validity check. Issuer Name and Subject Name of
certificate.
FCS_STG_EXT.1 Import or destruction of key. Identity of key. Role and identity of
requestor.
FCS_STG_EXT.3 Failure to verify integrity of stored key. Identity of key being verified.
FCS_TLSC_EXT.1 (O) Failure to establish a TLS session. Reason for failure.
FCS_TLSC_EXT.1 (O) Failure to verify presented identifier. Presented identifier and reference
identifier.
FCS_TLSC_EXT.1 (O) Establishment/termination of a TLS
session.
Non-TOE endpoint of connection.
FCS_TLSC_EXT.1/WLAN Failure to establish an EAP-TLS session. Reason for failure.
FCS_TLSC_EXT.1/WLAN Establishment/termination of an EAP-
TLS session.
Non-TOE endpoint of connection.
FDP_DAR_EXT.2 Failure to encrypt/decrypt data.
FDP_STG_EXT.1 Addition or removal of certificate from
Trust Anchor Database.
Subject name of certificate.
FIA_UAU.6 (O) User changes Password Authentication
Factor.
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FIA_X509_EXT.1 Failure to validate X.509v3 certificate. Reason for failure of validation.
FIA_X509_EXT.2 (O) Failure to establish connection to
determine revocation status.
FMT_SMF_EXT.1 Change of settings. Role of user that changed setting.
Value of new setting.
FMT_SMF_EXT.1 (O) Success or failure of function. Role of user that performed function.
Function performed.
Reason for failure.
FMT_SMF_EXT.1 (O) Initiation of software update. Version of update.
FMT_SMF_EXT.1 (O) Initiation of application installation or
update.
Name and version of application.
FPT_TST_EXT.1 &
FPT_TST_EXT.1/WLAN
Initiation of self-test. Failure of self-test. [none]
FPT_TST_EXT.1/WLAN Execution of this set of TSF self-tests.
 [detected integrity violations]
[The TSF binary file that caused the
integrity violation].
FPT_TST_EXT.2(1) Start-up of TOE.
[none]
No additional Information.
[no additional information]
FPT_TUD_EXT.2 (O) Success or failure of signature
verification for software updates.
FPT_TUD_EXT.2 (O) Success or failure of signature
verification for applications.
FTA_TAB.1 (O) Change in banner setting.
FTA_WSE_EXT.1 All attempts to connect to access points. Identity of access point being
connected to as well as success and
failures (including reason for failure).
FTP_ITC_EXT.1/WLAN All attempts to establish a trusted
channel.
(TD0194 applied)
Identification of the non-TOE
endpoint of the channel.
Table 8 Audit Events
FAU_SAR.1: The TOE provides the ability for the administrator to export and read the audit log.
FAU_SEL.1: The TOE provides the ability to select the audit events that are logged. There are three classes of audit
events that can be logged, system and apps, kernel and IP tables. Each can be controlled individually, so the
administrator can log just select classes of events. Within the classes, events can be selected based upon success,
failure, severity, event group, and UID.
FAU_STG.1: The TOE stores audit records in a file within the file system accessible only to Linux processes with
system permissions (effectively the TSF itself and MDM agents possessing a valid Knox license using the defined
APIs). These restrictions prevent the unauthorized modification or deletion of the audit records stored in the audit
files.
FAU_STG.4: The TOE pre-allocates a file system area (between 10MB and 50MB in size, depending upon
available storage on the device) by creating a /data/system/[admin_uid]_bubble/bubbleFile and directory
(/data/system/[admin_uid]) in which to archive compressed audit logs. If the TOE lacks sufficient space (at least
10MB), then the TOE returns a failure code in response to the administrator’s attempt to enable the AuditLog. Once
enabled, the TOE writes audit events into nodes until they read a given size, and then compresses and archives the
records. The TOE utilizes a circular buffer approach to handle when the accumulated, compressed audit events
exceed the allocated file system size. When the limit is reached, the TOE removes the oldest audit logs, freeing
space for new records.
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6.2 Cryptographic support
FCS_CKM.1: The TOE supports asymmetric key generation for all types in accordance with FIPS 186-4. The TOE
generates RSA keys in its SCrypto library and generates DH/ECDH/ECDSA (including P-256, P384 and P-521)
keys in both its SCrypto and BoringSSL libraries. The TOE supports generating keys with a security strength of
112-bits and larger, thus supports 2048-bit RSA and DH keys, and 256-bit ECDH/ECDSA keys. The TOE’s RSA
and ECDSA implementations have the CAVP certificates described in the FCS_COP.1 section below.
Cryptographic Library RSA Generation DH (FCC) ECDH (ECC) EDCSA (ECC)
BoringSSL (user space) No Yes Yes Yes
Kernel Crypto (Kernel) No No No No
SCrypto (TrustZone) Yes No No Yes
Application Processor No No No No
Table 9 Asymmetric Key Generation per module
FCS_CKM.1/WLAN: The TOE adheres to IEEE 802.11-2012 and IEEE 802.11ac-2014 for key generation. The
TOE’s wpa_supplicant provides the PRF384 for WPA2 derivation of 128-bit AES Temporal Key (using the HMAC
implementation provided by BoringSSL) and employs its BoringSSL AES-256 DRBG when generating random
values used in the EAP-TLS and 802.11 4-way handshake. The TOE supports the AES-128 CCMP encryption
mode. The TOE has successfully completed certification (including WPA2 Enterprise) and received Wi-Fi
CERTIFIED Interoperability Certificates from the Wi-Fi Alliance. The Wi-Fi Alliance maintains a website
providing further information about the testing program: http://www.wi-fi.org/certification.
Device Name Model Number Wi-Fi Alliance Certificate Numbers
Galaxy Tab
Active2
SM-T39xx 73278, 73501, 73502, 74227
Table 10 Wi-Fi Alliance Certificates
FCS_CKM.1/VPN: The VPN uses the TOE cryptographic libraries to generate asymmetric keys (RSA or ECDSA)
for authentication during the IKE key exchange. Note that ECDSA is only supported by IKEv2 connections.
FCS_CKM.2(1): The TOE supports RSA (800-56B, as an initiator only), DHE (FFC 800-56A), and ECDHE (ECC
800-56A) methods in TLS key establishment/exchange. The TOE has CVL KAS and ECDSA CAVP algorithm
certificates for Elliptic Curve key establishment and key generation respectively as described in the FCS_COP.1
section below. Samsung vendor-affirms that the TOE’s RSA key establishment follows 800-56B. The user and
administrator need take no special configuration of the TOE as the TOE automatically generates the keys needed for
negotiated TLS ciphersuites. Because the TOE only acts as a TLS client, the TOE only performs 800-56B
encryption (specifically the encryption of the Pre-Master Secret using the Server’s RSA public key) when
participating in TLS_RSA_* based TLS handshakes. Thus, the TOE does not perform 800-56B decryption.
However, the TOE’s TLS client correctly handles other cryptographic errors (for example, invalid checksums,
incorrect certificate types, corrupted certificates) by sending a TLS fatal alert.
FCS_CKM.2(2): The TOE uses ECDH with a P-256 curve key establishment for protection of application sensitive
data received while the device is locked.
FCS_CKM.2/WLAN: The TOE adheres to RFC 3394, SP 800-38F, and 802.11-2012 standards and unwraps the
GTK (sent encrypted with the WPA2 KEK using AES Key Wrap in an EAPOL-Key frame). The TOE, upon
receiving an EAPOL frame, will subject the frame to a number of checks (frame length, EAPOL version, frame
payload size, EAPOL-Key type, key data length, EAPOL-Key CCMP descriptor version, and replay counter) to
ensure a proper EAPOL message and then decrypt the GTK using the KEK, thus ensuring that it does not expose the
Group Temporal Key (GTK).
FCS_CKM_EXT.1: The TOE supports a Root Encryption Key (REK) within the main (application) processor.
Requests for encryption or decryption chaining to the REK are only accessible through the Trusted Execution
Environment, or TEE (TrustZone). The REK lies in a series of 256-bit fuses, programmed during manufacturing.
The TEE does not allow direct access to the REK but provides services to derive a HEK (Hardware Encryption Key,
which is derived from the REK through a KDF function) for encryption and decryption.
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The REK value is generated during manufacturing either by the TOE (if it detects that the REK fuses have not been
set) using its hardware DRBG or is generated during fabrication using an external RBG that meets the requirements
of this PP in that the process utilizes a SHA-256 Hash_DRBG seeded by a hardware entropy source identical in
architecture to that within the TOE. This fabrication process includes strict controls (including physical and logical
access control to the manufacturing room where programming takes place as well as video surveillance and access
only to specific, authorized, trusted individuals) to ensure that the fabricator cannot access any REK values between
generation and programming.
FCS_CKM_EXT.2: The TOE supports Data Encryption Key (DEK) generation using its approved RBGs. The TOE
RBGs are capable of generating both AES 128-bit and AES 256-bit DEKs in response to applications and services
on the device. These can be accessed through both Android native APIs and C APIs depending on the library being
called.
FCS_CKM_EXT.3: The TOE generates KEKs (which are always AES 256-bit keys generated by one of the TOE’s
DRBGs) through a combination of methods. First, the TOE generates a KEK (the Keystore masterkey) for each
user of the TOE. The TOE also generates encryption KEKs for Onboard Device Encryption (ODE), the SD Card
encryption, and container (Knox) encryption (both normal and sensitive).
The TOE generates a number of different KEKs. In addition to the TSF KEKs, applications may request key
generation (through the Android/Java APIs), and the TOE utilizes its BoringSSL CTR_DRBG to satisfy those
requests. The requesting application ultimately chooses whether to use that key as a DEK or a KEK (and can choose
whether it wishes that key to be 128 or 256-bits), but it is worth mentioning here, as an application can utilize such a
key as a KEK, should it choose.
FCS_CKM_EXT.4: The TOE destroys cryptographic keys when they are no longer in use by the system. The
exceptions to this are public keys (that protect the boot chain and software updates) and the REK, which are never
cleared. Keys stored in RAM during use are destroyed by a zero overwrite. Keys stored in Flash (i.e. eMMC) are
destroyed by cryptographic erasure through a block erase call to the flash controller for the location where the ODE
and SD Card keys are stored. Once these are erased, all keys (and data) stored within the encrypted data partition of
the TOE are considered cryptographically erased.
FCS_CKM_EXT.5: The TOE provides a TOE Wipe function that first erases the encrypted ODE DEK used to
encrypt the entire data partition using a block erase and read verify command to ensure that the TOE writes zeros to
the eMMC blocks containing the encrypted ODE DEK (the crypto footer contains the encrypted DKEKs and DEKs
(ODE and SD Card)). After overwriting that, the TOE will reformat the partition. Upon completion of reformatting
the Flash partition holding user data, the TOE will perform a power-cycle.
FCS_CKM_EXT.6: The TOE creates salt and nonces (which are just salt values used in WPA2) using its AES-256
CTR_DRBG.
Salt value and size RBG origin Salt storage location
User password salt (256-bit) BoringSSL’s AES-256 CTR_DRBG Flash file system
TLS client_random (256-bit) BoringSSL’s AES-256 CTR_DRBG N/A (ephemeral)
TLS pre_master_secret (384-bit) BoringSSL’s AES-256 CTR_DRBG N/A (ephemeral)
TLS DHE/ECDHE private value (256, 384, 512) BoringSSL’s AES-256 CTR_DRBG N/A (ephemeral)
WPA2 4-way handshake supplicant nonce (SNonce)
BoringSSL’s AES-256 CTR_DRBG
through wpa_supplicant
N/A (ephemeral)
Table 11 Salt Creation
FCS_COP.1: The TOE performs cryptographic algorithms in accordance with the following NIST standards and
has received the following CAVP algorithm certificates.
The BoringSSL v1.2.1 (Android 8.1) libraries provide the following algorithms.
Algorithm NIST Standard SFR Reference Cert#
AES 128/256 CBC, GCM, KW FIPS 197, SP 800-38A/D/F FCS_COP.1(1) 5468
CVL ECC/FFC SP 800-56A
FCS_CKM.2(1)
FCS_CKM_EXT.3
1920
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Algorithm NIST Standard SFR Reference Cert#
DSA FFC SigGen/SigVer FIPS 186-4 FCS_CKM.1 1406
DRBG CTR SP 800-90A FCS_RBG_EXT.1 2149
ECDSA PKG/PKV/SigGen/SigVer FIPS 186-4
FCS_CKM.1
FCS_CKM.2(1)
FCS_COP.1(3)
1463
HMAC SHA-1/256/384/512 FIPS 198-1 & 180-4 FCS_COP.1(4) 3626
RSA SigGen/SigVer FIPS 186-4 FCS_COP.1(3) 2937
SHS SHA-1/256/384/512 FIPS 180-4 FCS_COP.1(2) 4389
KBKDF SP 800-108 FCS_CKM_EXT.3 218
Table 12 BoringSSL Cryptographic Algorithms
The Samsung Kernel Cryptographic (“Kernel Crypto”) Module provides the following algorithms. The Tab Active2
uses version 1.7.1.
Algorithm NIST Standard SFR Reference Cert#
AES 128/256 CBC FIPS 197, SP 800-38A FCS_COP.1(1) 4745, 4744
HMAC SHA-1/256 FIPS 198-1 & 180-4 FCS_COP.1(4) 3160, 3159
DRBG SHA-256 HMAC_DRBG SP 800-90A FCS_RBG_EXT.1 1627
SHS SHA-1/256 FIPS 180-4 FCS_COP.1(2) 3889, 3888
Table 13 Samsung Kernel Cryptographic Algorithms
The Samsung SCrypto TEE library provides the following algorithms. The Tab Active2 devices use SCrypto v2.0
running in Kinibi 310. Note that the TOE only performs RSA signing/decryption (using the private key) in the TEE,
and performs public key verification/encryption in the normal world using BoringSSL.
Algorithm NIST Standard SFR Reference Cert#’s
AES CBC/GCM FIPS 197, SP 800-38A/D FCS_COP.1(1) 4389
DRBG AES-256 CTR_DRBG SP 800-90A FCS_RBG_EXT.1 1412
ECDSA PKG/PKV/SigGen/SigVer FIPS 186-4
FCS_CKM.1
FCS_COP.1(3)
1049
HMAC SHA-1/256/384/512 FIPS 198-1 & 180-4 FCS_COP.1(4) 2916
RSA KeyGen and SigGen (no
verification)
FIPS 186-4
FCS_CKM.1FCS_CKM.2(1)
FCS_COP.1(3)
2372
SHS SHA-1/256/384/512 FIPS 180-4 FCS_COP.1(2) 3618
KBKDF SP800-108 FCS_CKM_EXT.3 125
Table 14 SCrypto TEE Cryptographic Algorithms
The Samsung Flash Memory Protector (“FMP”) Driver Module provides the following software algorithms. The
Tab Active2 uses FMP software driver version 1.3.1.
Algorithm NIST Standard SFR Reference Cert#
SHS SHA-256 (Exynos FMP) FIPS 180-4 FCS_COP.1(2) 3854
HMAC SHA-256 (Exynos FMP) FIPS 198-1 & 180-4 FCS_COP.1(4) 3126
Table 15 Samsung Flash Memory Protector Driver (Kernel) Algorithms
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The Chipset hardware provides the following algorithms. The Tab Active2 uses the Exynos 7870 processor, which
incorporates Samsung FMP hardware version 3.01 and SSS. The Tab Active2 also uses the Atheros QCA9377 Wi-
Fi chipset.
Algorithm NIST Standard SFR Reference Cert#’s
AES 128 CCM (Atheros Wi-Fi)
FIPS 197, SP 800-
38C
FCS_COP.1(1) 2450
AES 128/256 XTS (Exynos FMP)
FIPS 197, SP 800-
38E
FCS_COP.1(1) 4407
KBKDF (Exynos SSS) SP 800-108 FCS_CKM_EXT.3 C802
AES 128/256 CBC/GCM (Exynos
SSS)
FIPS 197, SP 800-
38A/D
FCS_COP.1(1) C802
SHS SHA-256 (Exynos SSS) FIPS 180-4 FCS_COP.1(2) C802
HMAC SHA-256 (Exynos SSS) FIPS 198-1 & 180-4 FCS_COP.1(4) C802
Table 16 Chipset Hardware Cryptographic Algorithms
The TOE’s application processors include hardware entropy implementations that supply random data within the
TEE and to the Linux kernel RNG (/dev/random).
Note that kernel-space system applications utilize the cryptographic algorithm implementations in the Samsung
Kernel Cryptographic Module (Kernel Crypto) or in the Chipset hardware, while user-space system applications and
mobile applications utilize the BoringSSL library (through the Java API). In the case of each cryptographic library,
the library itself includes any algorithms required (for example, BoringSSL provides hash functions for use by
HMAC and digital signature algorithms).
Trusted Applications executing with the Trusted Execution Environment (TEE) utilize the SCrypto library. For
example, the trusted application implementing the Android Keymaster that supports the Android Keystore utilizes
the SCrypto library for all of its cryptographic functionality.
For its HMAC implementations, the TOE accepts all key sizes of 160, 256, 384, & 512; supports all SHA sizes save
224 (e.g., SHA-1, 256, 384, & 512), utilizes the specified block size (512 for SHA-1 and 256, and 1024 for SHA-
384 & 512); and outputs MAC lengths of 160, 256, 384, and 512.
The TOE conditions the user's password exactly as per SP 800-132 (and thus as per SP 800-197-1) with no
deviations by using PBKDF2 with 4096 HMAC-SHA-512 or HMAC-SHA-256 (depending on the use) iterations to
combine a 128-bit salt with the user’s password. The time needed to derive keying material does not impact or
lessen the difficulty faced by an attacker’s exhaustive guessing as the combination of the password derived KEK
with REK value entirely prevents offline attacks and the TOE’s maximum incorrect password login attempts
(between 1 and 30 incorrect attempts with 4 character, minimum, passwords) prevents exhaustive online attacks.
The TOE’s algorithm certificates represent the BoringSSL library, Kernel Cryptographic module, SCrypto library,
and Chipset hardware implementations. These implementations have been tested upon Android 8.1 (Oreo) running
atop Exynos ARMv8 chipsets. The TOE’s Exynos processor devices include the Samsung Flash Memory Protector
(FMP v1.2.1) implementation for encryption and decryption.
FCS_HTTPS_EXT.1: The TOE includes the ability to support the HTTPS protocol (compliant with RFC 2818) so
that (mobile and system client) applications executing on the TOE can securely connect to external servers using
HTTPS. Administrators have no credentials and cannot use HTTPS or TLS to establish administrative sessions with
the TOE as the TOE does not provide any such capabilities.
FCS_IPSEC_EXT.1: The TOE’s VPN Client implements the IPsec protocol as specified in RFC 4301; however,
the VPN Client presents as few configuration options as possible to the User in order to minimize the possibility of
misconfiguration and relies upon the Gateway to enforce organizational policies (for things like the specific cipher
suites and selection of traffic to protect). For this reason, the VPN Client does not support editing of its SPD entries.
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The VPN Client will insert a PROTECT rule to IPsec encrypt and send all TOE traffic to the VPN GW (as the VPN
Client ignores the IKEv1/IKEv2 Traffic Selector negotiated between the client and gateway and always sends all
traffic).
The VPN Client routes all packets through the kernel’s IPsec interface (ipsec0) when the VPN is active. The kernel
compares packets routed through this interface to the SPDs configured for the VPN to determine whether to
PROTECT, BYPASS, or DISCARD each packet. The vendor designed the TOE’s VPN Client, when operating in
CC Mode, to allow no configuration and to always force all traffic through the VPN. The VPN Client ignores any
IKEv1/IKEv2 traffic selector negotiations with the VPN GW and will always create an SPD PROTECT rule that
matches all traffic. Thus, the kernel will match all packets, subsequently encrypt those packets, and finally forward
them to the VPN Gateway. The VPN Client supports tunnel mode for its IPsec connections. The VPN Client
provides IKEv1/IKEv2 key establishment as part of its IPsec implementation. The IKEv1/IKEv2 implementation is
conformant with RFCs 5996 and 4307 and supports NAT traversal. IKEv1 only supports main mode and requires
no configuration for this enforcement.
The TOE provides RFC 4106 conformant AES-GCM-128 and AES-GCM-256, and RFC 3602 conformant AES-
CBC-128 and AES-CBC-256 as encryption algorithms. The TOE Platform also provides SHA-1 (SHA-1 can only
be used for IKEv2 connections), SHA-256, SHA-384, and SHA-512 in addition to HMAC-SHA1, HMAC-SHA-
256, HMAC-SHA-384, and HMAC-SHA-512 as integrity/authentication algorithms (producing message digests of
160, 256, 384, and 512-bits in length) as well as Diffie-Hellman Groups 5, 14, 19, 20 and 24. The VPN utilizes the
algorithms from the BoringSSL and Kernel Cryptographic modules as part of the IKEv1/IKEv2 and IPsec protocols
(however, note that IKEv1 does not support SHA-1). The encrypted payload for IKEv1/IKEv2 uses AES-CBC-128,
AES-CBC-256 as specified in RFC 6379 and (for IKEv2) AES-GCM-128 and AES-GCM-256 as specified in RFC
5282. The TOE relies upon the VPN Gateway to ensure that by default the strength of the symmetric algorithm (in
terms of the number of bits in the key) negotiated to protect the IKEv1 Phase 1/IKEv2 /IKE_SA connection is
greater than or equal to the strength of the symmetric algorithm (in terms of the number of bits in the key) negotiated
to protect the IKEv1 Phase 2/IKEv2 CHILD_SA connection. The IKEv1 implementation includes XAUTH
authentication.
An administrator can configure the VPN Gateway to limit SA lifetimes based on length of time to values that
include 24 hours for IKE SAs and 8 hours for IPsec SAs. The TOE includes hardcoded limits of 10 hours for an
IKE SA and 3 hours for an IPsec SA. The TOE and VPN Gateway will rekey their IKE and IPsec SAs after the
shorter of either 10 hours and 3 hours respectively (the TOE’s fixed lifetimes) or the administrator specified lifetime
configured on the VPN Gateway.
The VPN Client generates the secret value x used in the IKEv1/IKEv2 Diffie-Hellman key exchange ('x' in gx
mod
p) using the FIPS validated RBG specified in FCS_RBG_EXT.1 and having possible lengths of 224, 256, or 384
bits. When a random number is needed for a nonce, the probability that a specific nonce value will be repeated
during the life of a specific IPsec SA is less than 1 in 2112
, 2128
, or 2192
.
The VPN Client implements peer authentication using RSA certificates or ECDSA certificates (IKEv1 does not
support using ECDSA certificates) that conform to RFC 4945 and FIPS 186-4, or pre-shared keys. If certificates are
used, the VPN Client ensures that the IP address or Fully Qualified Distinguished Name (FQDN) contained in a
certificate matches the expected IP Address or FQDN for the entity attempting to establish a connection and ensures
that the certificate has not been revoked (using the Online Certificate Status Protocol [OCSP] in accordance with
RFC 2560).
Pre-shared keys can include any letter from a-z, A-Z, the numbers 0 – 9, and the special character located above the
numbers on a US keyboard (“!@#$%^&*()”). The specific length of 22 characters required by the VPNC21 is
supported by the VPN Client. The VPN Client processes the pre-shared keys by using the entered string as ASCII
Hex values.
The TOE supports a number of different Diffie-Hellman (DH) groups for use in SA negotiation including DH
Groups 5 (1536-bit MODP), 14 (2048-bit MODP), 19 (256-bit Random ECP), 20 (384-bit Random ECP), and 24
(2048-bit MODP with 256-bit POS). The TOE selects the DH group by selecting the largest group configured by an
administrator that is offered by the VPN gateway.
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During the Peer Authentication stage of IPsec, the TOE Platform will verify the authenticity of the VPN gateway’s
X.509v3 certificate by validating the certificate, validating the certificate path, validating the certificate’s revocation
status using OCSP, validating that the certificate path terminates in a trusted CA certificate, and validating that the
CA certificate has the basicConstraints extension present and the CA flag set to true. The TOE will also ensure that
the Subject Alternative Name IP address or DNS name in the VPN gateway’s certificate matches the IP address or
DNS name configured in the VPN profile. If the configured IP address or DNS name does not match a Subject
Alternative Name in the VPN gateway’s certificate, the TOE will refuse to establish an IPsec connection with the
VPN gateway.
The VPN Client relies upon the VPN Gateway to ensure that the cryptographic algorithms and key sizes negotiated
during the IKEv1/IKEv2 negotiation ensure that the security strength of the Phase 1/IKE_SA are greater than or
equal to that of the Phase 2/CHILD_SA.
FCS_IV_EXT.1: The TOE generates IVs for data storage encryption and for key storage encryption. The TOE uses
AES-XTS and AES-CBC mode for data encryption and AES-GCM for key storage.
FCS_RBG_EXT.1: The TOE provides a number of different RBGs including:
1. An AES-256 CTR_DRBG provided by BoringSSL. The TOE provides mobile applications access
(through an Android Java API) to random data drawn from its AES-256 CTR_DRBG
2. An AES-256 CTR_DRBG provided by SCrypto in the TEE
3. A SHA-256 HMAC_DRBG provided by Kernel Crypto in the Android kernel
The TOE ensures that it initializes each RBG with sufficient entropy ultimately accumulated from a TOE-hardware-
based noise source. The TOE uses its hardware-based noise source to continuously fill /dev/random with random
data that has full entropy, and in turn, the TOE draws from /dev/random to seed both its AES-256 CTR_DRBG and
its SHA-256 HMAC_DRBG. The TOE seeds each of its AES-256 CTR_DRBGs using 384-bits of data from
/dev/random, thus ensuring at least 256-bits of entropy. Finally, the TOE seeds the SHA-256 HMAC_DRBG with
440-bits of data from /dev/random, also ensuring that it contains at least 256-bits of entropy. These RBGs are all
capable of providing other amounts of entropy (such as 128-bits) to any requesting application. The TOE itself
always uses 256-bits of entropy, but other applications or services are not subject to this limitation, and can request
128-bits or 256-bits of entropy subject its own requirements.
FCS_RBG_EXT.2: The devices save a block of 4096-bits of random data, and upon the next boot, a service called
entropy mixer adds the block of saved random data into the Linux Kernel Random Number Generator’s input pool.
FCS_SRV_EXT.1/2: The TOE provides applications access to the cryptographic operations including encryption
(AES), hashing (SHA), signing and verification (RSA & ECDSA), key hashing (HMAC), password-based key-
derivation functions (PKBDFv2 HMAC-SHA-512), generating asymmetric keys for key establishment (RSA and
ECDH), and generating asymmetric keys for signature generation and verification (RSA, ECDSA). The TOE
provides access through the Android operating system’s Java API methods and through the kernel. The vendor also
developed testing applications to enable execution of the NIST algorithm testing suite in order to verify the
correctness of the algorithm implementations.
FCS_STG_EXT.1: The TOE provides users and applications running on the TOE the ability to generate, import,
and securely store symmetric and asymmetric keys through the TOE’s Android Keystore. The TOE allows a user to
import a certificate (in PKCS#12 [PFX] format) and provides applications running on the TOE an API to import a
certificate or secret key. In either case, the TOE will place the key into the user’s keystore (and the TOE will
remove the PKCS#12 password-based protection if the imported key is a certificate) and doubly encrypt the
imported key with DEKs, which in turn are encrypted by a KEK derived from the user's DKEK and a KEK derived
from the REK. All user and application keys placed into the user’s keystore are secured in this fashion. The TOE
also encrypts (using ODE) the Flash file system in which all keystore blobs reside (as encrypted files), providing yet
another layer of encryption protection to keystore objects.
The user of the TOE can elect to delete keys from the keystore, as well as to securely wipe the entire device.
The TOE affords applications control (control over use and destruction) of keys that they create or import, and only
the user or a common application developer can explicitly authorize access, use, or destruction of one application’s
key by any other application.
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Entity Can import? Can
destroy?
Allow other
app to use?
Allow other
app to destroy
User Yes Yes Yes
Administrator Yes Yes
Mobile application Yes Yes
Common application developer Yes Yes
Table 17 Key Management Matrix
FCS_STG_EXT.2: The TOE provides protection for all stored keys (i.e. those written to storage media for
persistent storage) chained to both the user’s password and the REK. All keys are encrypted with AES-GCM or
AES-CBC (in the case of SD card File Encryption Keys). All KEKs are 256-bit, ensuring that the TOE encrypts
every key with another key of equal or greater strength/size.
In the case of Wi-Fi, the TOE utilizes the 802.11-2012 KCK and KEK keys to unwrap (decrypt) the WPA2 Group
Temporal Key received from the access point. Additionally, the TOE protects persistent Wi-Fi keys (user
certificates) by storing them in the Android Keystore.
FCS_STG_EXT.3: The key hierarchy shows AES-256 GCM is used to encrypt all KEKs other than SD Card keys
(which uses HMAC for integrity) and the GCM encryption mode itself ensures integrity as authenticated decryption
operations fail if the encrypted KEK becomes corrupted.
FCS_TLSC_EXT.1/2: The TOE provides mobile applications (through its Android API) the use of TLS version 1.2
including support for the selected ciphersuites in the selections in section 5.1.2.28. The TOE supports Common
Name (CN) and Subject Alternative Name (SAN) (DNS and IP address) as reference identifiers. The TOE supports
client (mutual) authentication. The TOE inherently (without requiring any configuration) supports the evaluated
elliptic curves (P-256 and P-384); neither the user nor the administrator need configure anything in order for the
TOE to support these curves. The TOE supports the use of wildcards in X.509 reference identifiers (CN and SAN),
and the TOE supports certificate pinning through Android’s Network security configuration. This configuration
allows a mobile application to specify one or more certificate public key hashes (SHA-1 or SHA-256) along with the
domain and optionally an expiry. With such a configuration, the application will only establish a TLS connection if
one of the public keys in the certificate path matches a “pinned“ key hash. After the optional expiry, Android
disregards the pinned certificates an performs no pinning (to prevent connectivity issues in apps which have not
been updated).
FCS_TLSC_EXT.1/WLAN & FCS_TLSC_EXT.2/WLAN: The TSF supports TLS versions 1.0, 1.1, and 1.2 with
client (mutual) authentication and supports the ciphersuites in the selections in section 5.1.2.29 for use with EAP-
TLS as part of WPA2. The TOE, by design, supports the evaluated elliptic curves (P-256 and P-384) and
requires/allows no configuration of the supported curves.
6.3 User data protection
FDP_ACF_EXT.1/2/3:
The TOE provides protection for high-level services like location, email, calendar in addition to providing individual
permissions to which mobile applications can request access.
The TOE provides the following categories of system services to applications:
1. normal – A lower-risk permission that gives an application access to isolated application-level features,
with minimal risk to other applications, the system, or the user. The system automatically grants this type
of permission to a requesting application at installation, without asking for the user's explicit approval
(though the user always has the option to review these permissions before installing).
2. dangerous – A higher-risk permission that would give a requesting application access to private user data or
control over the device that can negatively impact the user. Because this type of permission introduces
potential risk, the system may not automatically grant it to the requesting application. For example, any
dangerous permissions requested by an application may be displayed to the user and require confirmation
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before proceeding, or some other approach may be taken to avoid the user automatically allowing the use
of such facilities.
3. signature – A permission that the system is to grant only if the requesting application is signed with the
same certificate as the application that declared the permission. If the certificates match, the system
automatically grants the permission without notifying the user or asking for the user's explicit approval.
4. signatureOrSystem – A permission that the system is to grant only to packages in the Android system
image or that are signed with the same certificates. Please avoid using this option, as the signature
protection level should be sufficient for most needs and works regardless of exactly where applications are
installed. This permission is used for certain special situations where multiple vendors have applications
built in to a system image which need to share specific features explicitly because they are being built
together.
An example of a normal permission is the ability to vibrate the device: android.permission.VIBRATE. This
permission allows an application to make the device vibrate, and an application that does not declare this permission
would have its vibration requests ignored.
An example of a dangerous privilege would be access to location services to determine the location of the mobile
device: android.permission.ACCESS_FINE_LOCATION. The TOE controls access to dangerous
permissions during the installation of the application. The TOE prompts the user to review the application’s
requested permissions (by displaying a description of each permission group, into which individual permissions
map, to which an application requested access). If the user approves, then the mobile device continues with the
installation of the application. Thereafter, the mobile device grants that application during execution access to the
set of permissions declared in its Manifest file.
An example of a signature permission is the android.permission.BIND_VPN_SERVICE that an application
must declare in order to utilize the VpnService APIs of the device. Because the permission is a signature
permission, the mobile device only grants this permission to an application that requests this permission and that has
been signed with the same developer key used to sign the application declaring the permission (in the case of the
example, the Android Framework itself).
An example of a signature permission is the android.permission.LOCATION_HARDWARE, which allows an
application to use location features in hardware (such as the geofencing API). The device grants this permission to
requesting applications that either have been signed with the same developer key used to sign the android
application declaring the permissions or that reside in the “system” directory within Android, which for Android 4.4
and above, are applications residing in the /system/priv-app/ directory on the read-only system partition. Put another
way, the device grants systemOrSignature permissions by Signature or by virtue of the requesting application being
part of the “system image.”
Additionally, Android includes the following flags that layer atop the base categories:
1. privileged – this permission can also be granted to any applications installed as privileged apps on the
system image. Please avoid using this option, as the signature protection level should be sufficient for most
needs and works regardless of exactly where applications are installed. This permission flag is used for
certain special situations where multiple vendors have applications built in to a system image which need to
share specific features explicitly because they are being built together.
2. system – Old synonym for "privileged".
3. development – this permission can also (optionally) be granted to development applications (e.g., to allow
additional location reporting during beta testing).
4. appop – this permission is closely associated with an app op for controlling access.
5. pre23 – this permission can be automatically granted to apps that target API levels below API level 23
(Marshmallow/6.0).
6. installer – this permission can be automatically granted to system apps that install packages.
7. verifier – this permission can be automatically granted to system apps that verify packages.
8. preinstalled – this permission can be automatically granted to any application pre-installed on the system
image (not just privileged apps) (the TOE does not prompt the user to approve the permission).
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For older applications (those targeting Android’s pre-23 API level, i.e., API level 22 [lollipop] and below), the TOE
will prompt a user at the time of application installation whether they agree to grant the application access to the
requested services. Thereafter (each time the application is run), the TOE will grant the application access to the
services specified during install.
For newer applications (those targeting API level 23 or later), the TOE grants individual permissions at application
run-time by prompting the user for confirmation of each permissions category requested by the application (and only
granting the permission if the user chooses to grant it).
While Android provides a large number of individual permissions, they are generally grouped into categories or
features that provide similar functionality. Table 18 shows a series of functional categories centered around
common functionality.
Service Features Description
Sensitive I/O Devices & Sensors Location services, Audio & Video capture, Body sensors
User Personal Information & Credentials Contacts, Calendar, Call logs, SMS
Metadata & Device ID Information IMEI, Phone Number
Data Storage Protection SD Card, App data, App cache
System Settings & Application
Management
Date time, Reboot/Shutdown, Sleep, Force-close application,
Administrator Enrollment
Wi-Fi, Bluetooth, USB Access Wi-Fi, Bluetooth, USB tethering, debugging and file transfer
Mobile Device Management &
Administration
MDM APIs
Peripheral Hardware NFC, Camera, Headphones
Security & Encryption Certificate/Key Management, Password, Revocation rules
Table 18 Access Control Categories
FDP_PBA_EXT.1: The TOE requires the user to enter their password to enroll, re-enroll or un-enroll any biometric
templates. When the user attempts biometric authentication to the TOE, the biometric sensor takes an image of the
presented biometric for comparison to the enrolled templates. The captured image is compared to all the stored
templates on the device to determine if there is a match. The complete biometric authentication process is handled
inside the TEE (including image capture, all processing and match determination). The image is provided to the
biometric service to check the enrolled templates for a match to the captured image.
FDP_DAR_EXT.1: The TOE provides AES-256 XTS encryption of all data (which includes both user data and
TSF data) stored on the TOE through On Device Encryption (ODE) of the data partition. The TOE also has TSF
data for its ODE keys, which the TOE stores outside the ODE encrypted data partition, and the TOE also includes a
read-only file system in which the TOE’s system executables, libraries, and their configuration data reside. For its
ODE encryption of the data partition (where the TOE stores all user data and all application data), the TOE uses an
AES-256 bit DEK with XTS mode to encrypt the entire partition. The TOE also provides AES-256 CBC encryption
of protected data stored on the external SD Card using FEKs. The TOE encrypts each individual file stored on the
SD Card, generating a unique FEK for each file.
FDP_DAR_EXT.2: The TOE, as part of the Knox Platform for Enterprise, provides mobile applications the ability
to store sensitive data and have the TOE encrypt it accordingly. Based on the Work environment lock-state,
sensitive data protected by this mechanism will be encrypted when locked (either directly by the user via timeout).
An application can determine whether sensitive data should remain encrypted in this manner or if it should be re-
encrypted (such as by a symmetric key for better performance). Applications can use this to securely receive data
while the Work environment is locked (such as an email application).
FDP_IFC_EXT.1: The TOE supports the installation of VPN Client applications, which can make use of the
provided VPN APIs in order to configure the TOE’s routing functionality to direct all traffic through the VPN. The
TOE also includes an IPsec VPN Client that ensures all traffic other than traffic necessary to establish the VPN
connection (for example, ARP, 802.11-2012 traffic, IKEv1, and IKEv2) flows through the VPN. The TOE routes
all packets through the kernel’s IPsec interface (ipsec0) when the VPN is active. The kernel compares packets
routed through this interface to the SPDs configured for the VPN to determine whether to PROTECT, BYPASS, or
DISCARD each packet. The vendor developed the TOE’s VPN, when operating in CC Mode, to allow no
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configuration and to always force all traffic through the VPN. The TOE ignores any IKEv2 traffic selector
negotiations with the VPN GW and will always create an SPD PROTECT rule that matches all traffic. Thus, the
kernel will match all packets, subsequently encrypt those packets, and finally forward them to the VPN Gateway.
FDP_RIP.2: The TOE has been designed to ensure that no residual information exists in network packets when the
VPN is turned on. When the TOE allocates a new buffer for either an incoming or outgoing a network packet, the
new packet data will be used to overwrite any previous data in the buffer. If an allocated buffer exceeds the size of
the packet, any additional space will be overwritten (padded) with zeros before the packet is forwarded (to the
external network or delivered to the appropriate internal application).
FDP_STG_EXT.1: The TOE’s Trusted Anchor Database consists of the built-in certs (individually stored in
/system/etc/security/cacerts) which the user can disable using the TOE’s Android user interface
[Settings->Security-> Trusted Credentials] and consists of any additional user or admin/MDM loaded certificates.
Disabled default certificates and user added certificates reside in the /data/misc/user/0/cacerts-
removed and /data/misc/user/0/cacerts-added directories respectively. The built-in ones are
protected as they are part of the TSF’s read only system partition, while the TOE protects user-loaded certificates by
storing them with appropriate permissions to prevent modification by mobile applications. The TOE also stores the
user-loaded certificates in the user’s keystore.
FDP_UPC_EXT.1: The TOE provides APIs allowing non-TSF applications (mobile applications) the ability to
establish a secure channel using IPsec, TLS, HTTPS, Bluetooth BR/EDR and Bluetooth LE. Mobile applications
can use the following Android APIs for IPsec, TLS, HTTPS, and Bluetooth respectively:
android.net.VpnService
https://developer.android.com/reference/android/net/VpnService.html
com.samsung.android.knox.net.vpn
https://seap.samsung.com/api-references/android/reference/com/samsung/android/knox/net/vpn/package-
summary.html
javax.net.ssl.SSLContext:
http://developer.android.com/reference/javax/net/ssl/SSLContext.html
javax.net.ssl.HttpsURLConnection:
http://developer.android.com/reference/javax/net/ssl/HttpsURLConnection.html
android.bluetooth:
http://developer.android.com/reference/android/bluetooth/package-summary.html
6.4 Identification and authentication
FIA_AFL_EXT.1: The TOE maintains three separate lock screens: two lock screens for the TOE as a whole, and
one lock screen for KNOX containers.
For the TOE as a whole, the TOE maintains two lock screens, each with its own individually stored and maintained
(in separate Flash locations) the number of failed login attempts on the device. The first lock (crypt-lock) screen
appears after a power cycle and does not support the use of biometrics for authentication. When this crypt-lock
screen is active, the user data partition is encrypted and the TOE does not have access to data stored within it.
The second lock screen is the Android lock screen, during which time the TOE is active and the TOE has access to
the user data partition data after successful authentication to the first lock screen.
The TOE maintains, for each lock screen, the number of failed logins since the last successful login, and upon
reaching the maximum number of incorrect logins the TOE performs a full wipe of all protected data (and in fact,
wipes all users’ data). The TOE maintains the number of failed logins across power-cycles (so for example,
assuming a configured maximum retry of ten incorrect attempts, if one were to enter five incorrect passwords and
power cycle the phone, the phone would only allow five more incorrect login attempts before wiping) by storing the
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number of logins remaining within its Flash file system. An administrator can adjust the number of failed logins to
a value between one and 30 through an MDM, and this setting will be used at both lock screens.
For users with biometrics enabled, biometric authentication attempts are maintained along with the password
attempts. In all cases, biometric or hybrid authentication mechanisms are non-critical and cannot be the
authentication method that triggers an action (device or Workspace container wipe).
The maximum number of incorrect password authentication attempts can be configured to a value between 1 and 30.
The maximum number of biometric attempts is 10 (and cannot be changed). The user can attempt 10 biometric
attempts followed by the max value password attempts before the TOE will wipe itself. For example, if the counter
were set to 15, 10 biometric attempts would be followed by 15 password attempts before the device was wiped.
Alternatively, the user might enter 14 incorrect passwords, then ten failed biometric authentication attempts
followed by a final incorrect password attempt.
The TOE’s KNOX container provides its own lock screen, which allows password authentication or hybrid
authentication (biometric and password). The hybrid authentication method requires the user to authenticate with a
biometric and a password in sequential order. To login, the user must first enter his or her KNOX biometric and
only upon successfully verifying the user’s biometric, the TOE prompts the User for their KNOX password, and the
user must enter their password. KNOX will count the number of incorrect passwords attempted, and wipe the
KNOX container (and its associated data) after the user reaches the configured number of incorrect attempts.
The TOE validates passwords by providing them to Android’s Gatekeeper (which runs in the Trusted Execution
Environment), and if the presented password fails to validate, the TOE increments the failed attempt counter before
displaying a visual error to the user. The TOE validates biometric attempts through the biometric service (which
runs in the Trusted Execution Environment), and if the presented biometric does not match the registered templates,
the TOE increments the failed attempt counter before displaying a visual error to the user.
FIA_BLT_EXT.1: The TOE requires explicit user authorization before it will pair with a remote Bluetooth device.
When pairing with another device, the TOE requires that the user either confirm that a displayed numeric passcode
matches between the two devices or that the user enter (or choose) a numeric passcode that the peer device generates
(or must enter).
FIA_BLT_EXT.2: The TOE requires explicit user authorization or user authorization before data transfers over the
link. When transferring data with another device, the TOE requires that the user must confirm an authorization
popup displayed allowing data transfer (Obex Object Push) or confirm the user passkey displayed numeric passcode
matches between the two devices (RFCOMM).
FIA_BLT_EXT.3: The TOE tracks active connections and actively ignores connection attempts from Bluetooth
device addresses for which the TOE already has an active connection.
FIA_BLT_EXT.4: The TOE’s Bluetooth host and controller support Bluetooth Secure Simple Pairing and the TOE
utilizes this pairing method when the remote host also supports it.
FIA_BLT_EXT.6: The TOE supports OPP profiles on a per service basis (as opposed to a per app basis).
FIA_BMG_EXT.1(1)/.1(2):
The TOE provides options for fingerprint biometric authentication. The user must always have a password, even
when a biometric authentication method is enabled. Biometric authentication attempts are limited though there are
differences based on the devices. The user can switch between mechanisms at any time though the counters will not
reset between modality switches. All biometric attempts are enumerated in one counter with a maximum of 10 total
attempts before no more attempts are allowed.
In the evaluated configuration, the maximum number of authentication attempts is 40 before a wipe event is
triggered. This means that on all devices up to 10 biometric attempts and 30 password attempts could be made
before a wipe occurs. Using this as the worst-case scenario leads to a maximum of 10 biometric attempts that can be
made for the SAFAR calculations. All devices or configurations provide for fewer attempts (both password and
biometric), and so any resulting SAFAR would be lower than this scenario. The last attempt before a wipe must be
a password attempt.
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For a password-only configuration, the SAFAR claim would be 1:1,000,000 when set for 10 attempts. The
password minimum length is 4 characters and there are 93 possible characters that can be used in the password.
This is not claimed since this configuration (i.e. no biometric authentication allowed) would not require
FIA_BMG_EXT.1, but is shown here for the overall SAFAR calculations.
𝑆𝐴𝐹𝐴𝑅𝑝𝑎𝑠𝑠𝑤𝑜𝑟𝑑 = 1 − (1 − 1
93
⁄
4
)
30
= 4.010 ∗ 10−7
The FAR for fingerprint is 1:10,000 and the FRR is 3%. The SAFAR when a fingerprint is in use is 1:1,000 based
on a maximum of 10 attempts of the biometric as noted in the worst-case scenario.
𝑆𝐴𝐹𝐴𝑅𝑓𝑖𝑛𝑔𝑒𝑟𝑝𝑟𝑖𝑛𝑡 = 1 − (1 − 10−4)10
= 9.996 ∗ 10−4
For all SAFAR calculations the password is considered a critical factor for all combined factor SAFARany
calculations as detailed in MDFPP31 section H.4.
The Tab Active2 devices only support the use of fingerprint biometrics, so SAFARfingerprint is used for the
calculation. This is also the worst-case scenario for the Note9 devices as SAFARfingerprint is the lowest SAFAR value.
This value is accepted because it is within the 1% margin allowed by MDFPP31.
𝑆𝐴𝐹𝐴𝑅𝑎𝑛𝑦−𝑓𝑝 = 1 − (1 − 𝑆𝐴𝐹𝐴𝑅𝑓𝑖𝑛𝑔𝑒𝑟𝑝𝑟𝑖𝑛𝑡) ∗ (1 − 𝑆𝐴𝐹𝐴𝑅𝑝𝑎𝑠𝑠𝑤𝑜𝑟𝑑)
𝑆𝐴𝐹𝐴𝑅𝑎𝑛𝑦−𝑓𝑝 = 1.00022 ∗ 10−3
The Knox Platform for Enterprise provides hybrid (multi-factor: password and fingerprint) authentication. When
using the hybrid authentication mechanism, the user must enter a correct biometric factor and then a correct
password in order to successfully unlock the container.
The SAFAR when a hybrid mechanism is in use is equal to SAFARpassword as there is no limit to the number of
biometric attempts, but eventually the biometric factor must be entered correctly and then one must always enter a
correct password. Given the potentially unlimited biometric attempts, although that could take a very long time
given some imposed delays, that factor is discounted in calculating the SAFAR. The password minimum length is 4
characters and there are 93 possible characters that can be used in the password.
𝑆𝐴𝐹𝐴𝑅ℎ𝑦𝑏𝑟𝑖𝑑 = 𝑆𝐴𝐹𝐴𝑅𝑝𝑎𝑠𝑠𝑤𝑜𝑟𝑑
The biometric FAR/FRR values are tested internally by two independent groups using different methodologies. The
first set of tests are “offline” in that a specially configured device is connected to a test harness and used to enroll
biometric samples for storage. The test harness then uses the samples to run through numerous combinations of the
samples to determine FAR/FRR results that are used to tune the algorithms controlling the biometric system. Once
testing is complete a second set of tests are performed in an “online” manner where the testing is done with users
directly testing on a live device.
All devices with different hardware combinations that could affect the biometric subsystem are tested. These tests
are integrated into the production process and so are repeated continually during the development process.
FIA_PAE_EXT.1: The TOE can join WPA2-802.1X (802.11i) wireless networks requiring EAP-TLS
authentication, acting as a client/supplicant (and in that role connect to the 802.11 access point and communicate
with the 802.1X authentication server).
FIA_PMG_EXT.1: The TOE authenticates the user through a password consisting of basic Latin characters (upper
and lower case, numbers, and the special characters noted in the selection (see section 5.1.4.10)). The TOE can
support a minimum password length of as few as four characters and a maximum of no more than sixteen characters.
The TOE defaults to requiring passwords to have a minimum of four characters that contain at least one letter and
one number. An MDM application can change these defaults and impose password restrictions (like quality, specify
another minimum length, the minimum number of letters, numeric characters, lower case letters, upper case letters,
symbols, and non-letters).
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FIA_PSK_EXT.1: The TOE supports the use of pre-shared keys (the TOE allows 1 to 64 character PSKs) for IPsec
VPNs. Pre-shared keys can include any letter from a-z, A-Z, the numbers 0 – 9, and the special character located
above the numbers on a US keyboard (“!@#$%^&*()”). The specific length of 22 characters required by the
VPNC21 is supported by the TOE. The TOE does not perform any processing on pre-shared keys. The TOE simply
uses the pre-shared key that was entered by the user or administrator.
FIA_TRT_EXT.1: The TOE allows users to authenticate through external ports (either a USB keyboard or a
Bluetooth keyboard paired in advance of the login attempt). If not using an external keyboard, a user must
authenticate through the standard User Interface (using the TOE touchscreen). The TOE limits the number of
authentication attempts through the UI to no more than five attempts within 30 seconds (irrespective of what
keyboard the operator uses). Thus if the current [the nth
] and prior four authentication attempts have failed, and the
n-4th
attempt was less than 30 second ago, the TOE will prevent any further authentication attempts until 30 seconds
has elapsed. Note as well that the TOE will wipe itself when it reaches the maximum number of unsuccessful
authentication attempts (as described in FIA_AFL_EXT.1 above).
FIA_UAU.5: The TOE, in CC mode, allows the user to authenticate to the device’s Android lock screens (crypto-
lock and lock screen) using a password, or fingerprint and to authentication to the KNOX container lock screen
using a password or hybrid mechanism depending on the device configuration. The TOE prohibits other
authentication mechanisms such as pattern or PIN. Use of Smart Lock mechanisms (on-body detection, trusted
places, trusted devices, trusted face, trusted voice) can be blocked through management controls. Upon restart or
power-on the user can only use a password for authentication at the crypto-lock screen. Once past this
authentication screen the user is able to use one of the configured methods at the Android lock screen to login and
the KNOX container lock screen.
FIA_UAU.6(1)/FIA_UAU.6(2): The TOE requires the user to enter their password or supply their biometric in
order to unlock the TOE. Additionally, the TOE requires the user to confirm their current password when accessing
the “Settings->Display->LockScreen->Screen Security->Select screen lock” menu in the TOE’s user interface. The
TOE can disable Smart Lock through management controls. Only after entering their current user password can the
user then elect to change their password.
FIA_UAU.7: The TOE’s three lock screens (Android crypto-lock, Android normal lock screen, and KNOX
container lock screen), by default, briefly display the most recently entered password character and then obscures
the character by replacing the displayed character with a dot symbol. The user can configure the TOE’s behavior for
the normal lockscreen so that it does not briefly display the last typed character; however, the TOE always briefly
displays the last entered character for the crypt-lock screen and KNOX container lock screen. Additionally, the
TOE’s Android lock screen does not provide any feedback other than a notification of a failed biometric
(fingerprint) authentication attempt (“not recognized”). Similarly, the TOE’s KNOX container lock screen, when
configured for hybrid authentication, displays only an indication (“no match”) of a failed biometric attempt.
FIA_UAU_EXT.1: The TOE's Key Hierarchy requires the user's password in order to derive the PKEK1 & PKEK2
keys in order to decrypt other KEKs and DEKs. Thus, until it has the user's password, the TOE cannot decrypt the
DEK utilized by ODE to decrypt protected data.
FIA_UAU_EXT.2: The TOE, when configured to require user authentication (as is the case in CC mode), allows
only those actions described in section 5.1.4.18. Beyond those actions, a user cannot perform any other actions
other than observing notifications displayed on the lock screen until after successfully authenticating.
FIA_UAU_EXT.4: The TOE requires a separate password or hybrid authentication for its container, thus protecting
all Enterprise application data and shared resource data. The user must enter either their password or both their
password and biometric (if the user has configured hybrid container authentication and enrolled a biometric) in order
to access any of the Enterprise application data.
FIA_X509_EXT.1: The TOE checks the validity of all imported CA certificates by checking for the presence of the
basicConstraints extension and that the CA flag is set to TRUE as the TOE imports the certificate into the TOE’s
Trust Anchor Database. If the TOE detects the absence of either the extension or flag, the TOE will import the
certificate as a user public key and add it to the keystore (not the Trust Anchor Database). The TOE also checks for
the presence of the basicConstraints extension and CA flag in each CA certificate in a server’s certificate chain.
Similarly, the TOE verifies the extendedKeyUsage Server Authentication purpose during certificate validation. The
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TOE’s certificate validation algorithm examines each certificate in the path (starting with the peer’s certificate) and
first checks for validity of that certificate (e.g., has the certificate expired? or is it not yet valid? whether the
certificate contains the appropriate X.509 extensions [e.g., the CA flag in the basic constraints extension for a CA
certificate, or that a server certificate contains the Server Authentication purpose in the extendedKeyUsage field]),
then verifies each certificate in the chain (applying the same rules as above, but also ensuring that the Issuer of each
certificate matches the Subject in the next rung “up” in the chain and that the chain ends in a self-signed certificate
present in either the TOE’s trusted anchor database or matches a specified Root CA), and finally the TOE performs
revocation checking for all certificates in the chain.
FIA_X509_EXT.2/FIA_X509_EXT.2/WLAN: The TOE uses X.509v3 certificates as part of EAP-TLS, TLS,
HTTPS and IPsec authentication. The TOE comes with a built-in set of default Trusted Credentials (Android's set
of trusted CA certificates). And while the user cannot remove any of the built-in default CA certificates, the user
can disable any of those certificates through the user interface so that certificates issued by disabled CA’s cannot
validate successfully. In addition, a user can import a new trusted CA certificate into the Keystore or an
administrator can install a new certificate through an MDM.
The TOE does not establish TLS or HTTPS connections itself (beyond EAP-TLS used for WPA2 Wi-Fi
connections), but provides a series of APIs that mobile applications can use to check the validity of a peer
certificate. When establishing an EAP-TLS connection, the TOE does not check for certificate revocation as the
revocation servers are not available until after the EAP-TLS connection is established. The mobile application, after
correctly using the specified APIs, can be assured as to the validity of the peer certificate and will not establish the
trusted connection if the peer certificate cannot be verified (including validity, certification path, and revocation
[through CRL and OCSP]).
The VPN requires that for each VPN profile, the user specify the client certificate the TOE will use (the certificate
must have been previously imported into the keystore) and specify the CA certificate to which the server’s
certificate must chain. The VPN thus uses the specified certificate when attempting to establish that VPN
connection. The VPN processes a connection to a server by first comparing the Identification (ID) Payload received
from the server against the certificate sent by the server, and if the DN of the certificate does not match the ID, then
the TOE does not establish the connection.
During revocation checking (for any type of connection except EAP-TLS), the TOE first attempts to determine a
certificate’s revocation status through OCSP (if the Authority Information Access, AIA, extension is present). If the
certificate lacks AIA or if the OCSP server does not respond, or if the OCSP responder returns an unknown status;
the TOE attempts to determine revocation status using CRLs, if the certificate includes a CRL Distribution Point
(CDP). If the TOE cannot establish a connection with the server acting as the CDP, the TOE will deem the server’s
certificate as invalid and not establish a TLS connection with the server. Note that the VPN only checks OCSP for
revocation.
FIA_X509_EXT.3: The TOE’s Android operating system provides applications the
java.security.cert.CertPathValidator Java API Class of methods for validating certificates and
certification paths (certificate chains establishing a trust chain from a certificate to a trust anchor). This class is also
recommended to be used by third-party Android developers for certificate validation. However,
TrustedCertificateStore must be used to chain certificates to the Android System Trust Anchor Database
(anchors should be retrieved and provided to PKIXParameters used by CertPathValidator). The
available APIs may be found here:
http://developer.android.com/reference/java/security/cert/package-summary.html
6.5 Security management
FMT_MOF_EXT.1/FMT_SMF_EXT.1: The TOE provides the management functions described in Table 6. The
table includes annotations describing the roles that have access to each service and how to access the service. The
TOE enforces administrative configured restrictions by rejecting user configuration (through the UI) when
attempted.
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FMT_SMF_EXT.1/WLAN: The TOE provides the management functions described in Table 6 Rows 48-55. The
table includes annotations describing the roles that have access to each service and how to access the service. The
TOE enforces administrative configured restrictions by rejecting user configuration (through the UI) when
attempted. It is worth noting that the TOE’s ability to specify authorized application repositories takes the form of
allowing enterprise applications (i.e., restricting applications to only those applications installed by an MDM
Agent).
FMT_SMF_EXT.2: A user can unenroll an MDM agent from the device in one of two ways. First, a user can
revoke the MDM agent’s administrative privileges through the Settings app (Settings->Security & Location-
>Device admin apps) and then uninstall the agent. This method assumes that the MDM agent does block the user
from revoking the agent’s administrator privileges. When unenrolled in this fashion, the device will remove the
KNOX container, the container’s applications and data. In effect, this translates to the selections of wiping all
sensitive data (all KNOX container data), removing all Enterprise applications (all container applications), removing
all device-stored Enterprise application data (all container application data), and removing Enterprise secondary
authentication data (KNOX password and/or fingerprint).
In the case where an MDM agent blocks the user from revoking the agent’s administrative privileges, a user can
only unenroll by wiping the entire device. By doing this, the user causes the device to wipe all protected data
(wiping all data, including both the user’s protected data and any Enterprise/KNOX container data) as well as
remove MDM policies and disabling CC mode (as the device returns to factory defaults).
FMT_SMF_EXT.3: The TOE provides the user with the ability to see all apps installed on the device that have
administrative capabilities. Each app listing also shows the status of the app privileges for administration (enabled or
disabled) and the permissions the app has on the device.
FMT_SMF.1/VPN: The TOE provides the management functions described in Table 6 Rows 56-61. In addition,
the VPN Gateway, acting as administrator, can specify the IKE algorithms, protocols and authentication techniques,
and the crypto period for session keys.
The TOE provides users the ability to specify an X.509v3 certificate (previously loaded into the TOE Platform’s
keystore) for the TOE to use to authenticate to the VPN gateway during IPsec peer authentication as well as an
X.509v3 certificate to use as the CA certificate. The TOE alternatively provides users the ability to enter a Pre-
Shared Key to be used in lieu of an X.509v3 certificate during IPsec peer authentication.
6.6 Protection of the TSF
FPT_AEX_EXT.1: The Linux kernel of the TOE’s Android operating system provides address space layout
randomization utilizing a non-cryptographic kernel random function to provide 8 unpredictable bits to the base
address of any user-space memory mapping. The random function, though not cryptographic, ensures that one
cannot predict the value of the bits.
FPT_AEX_EXT.2/FPT_AEX_EXT.6: The TOE's Android 8.1 operating system utilizes 3.18 Linux kernel, whose
memory management unit (MMU) enforces read, write, and execute permissions on all pages of virtual memory and
ensures that write and execute permissions are not simultaneously granted on all memory (exceptions are only made
for Dalvik JIT compilation). The Android operating system (as of Android 2.3) sets the ARM eXecute Never (XN)
bit on memory pages and the TOE’s ARMv8 Application Processor’s MMU circuitry enforces the XN bits. From
Android’s documentation (https://source.android.com/devices/tech/security/index.html), Android 2.3 forward
supports “Hardware-based No eXecute (NX) to prevent code execution on the stack and heap”. Section D.5 of the
ARM v8 Architecture Reference Manual contains additional details about the MMU of ARM-based processors:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0487a.f/index.html.
FPT_AEX_EXT.3: The TOE's Android operating system provides explicit mechanisms to prevent stack buffer
overruns (enabling -fstack-protector) in addition to taking advantage of hardware-based No eXecute to prevent code
execution on the stack and heap. Samsung requires and applies these protections to all TSF executable binaries and
libraries.
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FPT_AEX_EXT.4: The TOE protects itself from modification by untrusted subjects using a variety of methods.
The first protection employed by the TOE is a Secure Boot process that uses cryptographic signatures to ensure the
authenticity and integrity of the bootloader and kernels using data fused into the device processor.
The TOE’s Secure Boot process employs a series of public keys to form a chain of trust that operates as follows.
The Application Processor (AP) contains the SHA-256 hash of the Secure Boot Public Key (an RSA 2048-bit key
embedded in the end of the signed bootloader image), and upon verifying the SBPK attached to the bootloader
produces the expected hash, the AP uses this public key to verify the PKCS 1.5 RSA 2048 w/ SHA-256 signature of
the bootloader image, to ensure its integrity and authenticity before transitioning execution to the bootloader. The
bootloader, in turn, contains the Image Signing Public Key (ISPK), which the bootloader will use to verify the
PKCS 1.5 RSA 2048 w/ SHA-1 signature on either kernel image (primary kernel image or recovery kernel image).
Note that when configured for Common Criteria mode, the TOE only accepts updates to the TOE Firmware Over
The Air; however, when not configured for CC mode, the TOE allows updates through the bootloader’s ODIN
mode. The primary kernel includes an embedded FOTA Public Key, which the TOE uses to verify the authenticity
and integrity of Firmware Over The Air update signatures (which contain a PKCS 2.1 PSS RSA 2048 w/ SHA-512
signature).
The TOE protects access to the REK and derived HEK to only trusted applications3
within the TEE (TrustZone).
The TOE key manager includes a TEE module which utilizes the HEK to protect all other keys in the key hierarchy.
All TEE applications are cryptographically signed, and when invoked at runtime (at the behest of an untrusted
application), the TEE will only load the trusted application after successfully verifying its cryptographic signature.
Furthermore, the device encryption library checks the integrity of the system by checking the result from both
Secure Boot/SecurityManager and from the Integrity Check Daemon before servicing any requests. Without this
TEE application, no keys within the TOE (including keys for ScreenLock, the keystore, and user data) can be
successfully decrypted, and thus are useless.
The third protection is the TOE’s internal SecurityManager watchdog service. The SecurityManager manages the
CC mode of the TOE by looking for unsigned kernels or failures from other, non-cryptographic checks on system
integrity, and upon detection of a failure in either, disables the CC mode and notifies the TEE application. The TEE
application then locks itself, again rendering all TOE keys useless.
Finally, the TOE’s Android OS provides “sandboxing” that ensures each non-system mobile application executes
with the file permissions of a unique Linux user ID in a different virtual memory space. This ensures that
applications cannot access each other’s memory space (it is possible for two processes to utilize shared memory, but
not directly access the memory of another application) or files and cannot access the memory space or files of
system-level applications.
FPT_BBD_EXT.1: The TOE’s hardware and software architecture ensures separation of the application processor
(AP) from the baseband or communications processor (CP). From a software perspective, the AP and CP
communicate logically through the Android Radio Interface Layer (RIL) daemon. This daemon, which executes on
the AP, coordinates all communication between the AP and CP. It makes requests of the CP and accepts the
response from the CP; however, the RIL daemon does not provide any reciprocal mechanism for the CP to make
requests of the AP. Because the mobile architecture provides only the RIL daemon interface, the CP has no method
to access the resources of the software executing on the AP.
FPT_JTA_EXT.1: The TOE prevents access to its processor’s JTAG interface by only enabling JTAG when the
TOE has a special image written to its bootloader/TEE partitions. That special image must be signed by the
appropriate key (corresponding to the public key that has its SHA-256 hash programmed into the processor’s fuses).
FPT_KST_EXT.1: The TOE does not store any plaintext key material in its internal Flash; instead, the TOE
encrypts all keys before storing them. This ensures that irrespective of how the TOE powers down (e.g., a user
commands the TOE to power down, the TOE reboots itself, or battery is removed), all keys in internal Flash are
wrapped with a KEK. Please refer to section 6.2 of the TSS for further information (including the KEK used)
regarding the encryption of keys stored in the internal Flash. As the TOE encrypts all keys stored in Flash, upon
boot-up, the TOE must first decrypt and utilize keys. Note as well that the TOE does not use a user’s biometric
3
A TrustZone application is a trusted application that executes in a hardware-isolated domain.
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fingerprint to encrypt/protect key material. Rather the TOE always requires the user enter his or her password after
a reboot (in order to derive the necessary keys to decrypt the user data partition and other keys in the key hierarchy).
FPT_KST_EXT.2: The TOE utilizes a cryptographic library consisting of an implementation of BoringSSL, the
kernel crypto module, the SCrypto module, and the following system-level executables that utilize KEKs: dm-crypt,
eCryptfs, wpa_supplicant, and the keystore.
The TOE ensures that plaintext key material is not exported by not allowing the REK to be exported and by ensuring
that only authenticated entities can request utilization of the REK. Furthermore, the TOE only allows the system-
level executables access to plaintext DEK values needed for their operation. The TSF software (the system-level
executables) protects those plaintext DEK values in memory both by not providing any access to these values and by
clearing them when no longer needed (in compliance with FCS_CKM_EXT.4). Note again that the TOE does not
use the user’s biometric fingerprint to encrypt/protect key material (and instead only relies upon the user’s
password).
FPT_KST_EXT.3: The TOE does not provide any way to export plaintext DEKs or KEKs (including all keys
stored in the keystore) as the TOE chains all KEKs to the HEK/REK.
FPT_NOT_EXT.1: When the TOE encounters a self-test failure or when the TOE software integrity verification
fails, the TOE transitions to a non-operational mode. The user may attempt to power-cycle the TOE to see if the
failure condition persists, and if it does persist, the user may attempt to boot to the recovery mode/kernel to wipe
data and perform a factory reset in order to recover the device.
FPT_STM.1: The TOE requires time for the Package Manager, FOTA image verifier, TLS certificate validation,
wpa_supplicant, audit system and keystore applications. These TOE components obtain time from the TOE using
system API calls [e.g., time() or gettimeofday()]. An application cannot modify the system time as mobile
applications need the Android “SET_TIME” permission to do so. Likewise, only a process with system privileges
can directly modify the system time using system-level APIs. The TOE uses the Cellular Carrier time (obtained
through the Carrier’s network time server) as a trusted source; however, the user can also manually set the time
through the TOE’s user interface.
FPT_TST_EXT.1: The TOE performs known answer power on self-tests (POST) on its cryptographic algorithms to
ensure that they are functioning correctly. The kernel itself performs known answer tests on its cryptographic
algorithms to ensure they are working correctly and the SecurityManager service invokes the self-tests of
BoringSSL at start-up to ensure that those cryptographic algorithms are working correctly. The Chipset hardware
performs a power-up self-test to ensure that its AES implementation is working as does the TEE SCrypto
cryptographic library. Should any of the tests fail, the TOE will reboot to see if that will clear the error.
Algorithm Implemented in Description
AES encryption/
decryption
BoringSSL, SCrypto, Kernel
Crypto, Chipset hardware
Comparison of known answer to calculated valued
ECDH key agreement BoringSSL Comparison of known answer to calculated valued
DRBG random bit
generation
BoringSSL, SCrypto, Kernel
Crypto
Comparison of known answer to calculated valued
ECDSA sign/verify BoringSSL, SCrypto Sign operation followed by verify
HMAC-SHA BoringSSL, SCrypto, Kernel
Crypto
Comparison of known answer to calculated valued
RSA sign/verify BoringSSL, SCrypto Comparison of known answer to calculated valued
SHA hashing BoringSSL, SCrypto, Kernel
Crypto
Comparison of known answer to calculated valued
Table 19 Power-up Cryptographic Algorithm Self-Tests
FPT_TST_EXT.1/WLAN & FPT_TST_EXT.1/VPN: The TOE platform performs the previously mentioned self-
tests to ensure the integrity of the WLAN client (wpa_supplicant) and the VPN client (libcharon.so) in addition to
the cryptographic libraries used by the clients.
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FPT_TST_EXT.2(1)/FPT_TST_EXT.2(2): The TOE ensures a secure boot process in which the TOE verifies the
digital signature of the bootloader software for the Application Processor (using a public key whose hash resides in
the processor’s internal fuses) before transferring control. The bootloader, in turn, verifies the signature of the
Linux kernel (either the primary or the recovery kernel) it loads.
The TOE also uses dm-verity in EIO mode to protect the integrity of the system partition. After verifying the digital
signature of the dm-verity hash tree (using the same public key that verifies the kernel image), the TOE will reject
the loading of filesystem blocks where the integrity does not match, and return an I/O error (as if the block were
unreadable).
FPT_TUD_EXT.1: The TOE’s user interface provides a method to query the current version of the TOE
software/firmware (Android version, baseband version, kernel version, build number, and security software version)
and hardware (model and version). Additionally, the TOE provides users the ability to review the currently installed
apps (including 3rd
party “built-in” applications) and their version.
FPT_TUD_EXT.2: When in CC mode, the TOE verifies all updates to the TOE software using a public key (FOTA
public key) chaining ultimately to the Secure Boot Public Key (SBPK), a hardware protected key whose SHA-256
hash resides inside the application processor (note that when not in CC mode, the TOE allows updates to the TOE
software through ODIN mode of the bootloader). After verifying an update’s FOTA signature, the TOE will then
install those updates to the TOE. The TOE will check a new image to ensure that the image is not older than the
current image, and if so, the TOE will reject the new image and not update the TOE software.
The application processing verifies the bootloader’s authenticity and integrity (thus tying the bootloader and
subsequent stages to a hardware root of trust: the SHA-256 hash of the SBPK, which cannot be reprogrammed after
the “write-enable” fuse has been blown).
The Android OS on the TOE requires that all applications bear a valid signature before Android will install the
application.
ALC_TSU_EXT: Samsung utilizes industry best practices to ensure their devices are patched to mitigate security
flaws. Samsung provides customers with a developer web portal (http://developer.samsung.com/notice/How-to-Use-
the-Forum) in which one can ask questions as well as inform Samsung of potential issues with their software (as
Samsung moderators monitor the forums), and as an Android OEM, also works with Google on reported Android
issues (http://source.android.com/source/report-bugs.html) to ensure customer devices are secure.
Samsung will create updates and patches to resolve reported issues as quickly as possible, at which point the update
is provided to the wireless carriers. The delivery time for resolving an issue depends on the severity, and can be as
rapid as a few days before the carrier handoff for high priority cases. The wireless carriers perform additional tests
to ensure the updates will not adversely impact their networks and then plan device rollouts once that testing is
complete. Carrier updates usually take at least two weeks to as much as two months (depending on the type and
severity of the update) to be rolled out to customers. However, the Carriers also release monthly Maintenance
Releases in order to address security-critical issues, and Samsung itself maintains a security blog
(http://security.samsungmobile.com) in order to disseminate information directly to the public.
Samsung communicates with the reporting party to inform them of the status of the reported issue. Further
information about updates is handled through the carrier release notes. Issues reported to Google directly are
handled through Google’s notification processes.
6.7 TOE access
FTA_SSL_EXT.1: The TOE transitions to its locked state either immediately after a user initiates a lock by
pressing the power button or after a configurable period of inactivity, and as part of that transition, the TOE will
display a lock screen to obscure the previous contents; however, the TOE’s lock screen still allows a user to perform
the functions listed in section 5.1.4.18 before authenticating. But without authenticating first, a user cannot perform
any related actions based upon these notifications (for example, they cannot respond to emails, calendar appointment
requests, or text messages) other than answering an incoming phone call.
Note that during power up, the TOE presents the user with an initial power-up ODE lock screen, where the user can
only make an emergency call or enter the ODE password, in order to allow the TOE to decrypt the ODE key so as to
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be able to access the data partition. After successfully authenticating at the power-up login screen, the TOE (when
subsequently locked) presents the user with the Android lock screen.
FTA_TAB.1: The TOE can be configured to display a user-specified message (maximum of 23 characters) on the
lock screen, and additionally an administrator can also set a lock screen message using an MDM.
FTA_WSE_EXT.1: The TOE allows an administrator to specify (through the use of an MDM) a list of wireless
networks (SSIDs) to which the user may direct the TOE to connect. When not enrolled with an MDM, the TOE
allows the user to control to which wireless networks the TOE should connect, but does not provide an explicit list
of such networks, rather the user may scan for available wireless network (or directly enter a specific wireless
network), and then connect. Once a user has connected to a wireless network, the TOE will automatically reconnect
to that network when in range and the user has enabled the TOE’s Wi-Fi radio.
6.8 Trusted path/channels
FTP_ITC_EXT.1/FTP_ITC_EXT.1/WLAN: The TOE provides secured (encrypted and mutually authenticated)
communication channels between itself and other trusted IT products through the use of 802.11-2012, 802.1X, and
EAP-TLS, TLS, HTTPS and IPsec. The TOE permits itself and applications to initiate communications via the
trusted channel, and the TOE initiates communication via the trusted channel for connection to a wireless access
point. The TOE provides access to TLS and HTTPS via published APIs which are accessible to any application that
needs an encrypted end-to-end trusted channel. The TOE also meets the PP-Module for Virtual Private Network
(VPN) Clients.
6.9 Knox Workspace Container Functionality
To differentiate the functionality provided specifically by a Knox Workspace container, this section enumerates the
functionality provided by the container.
FDP_ACF_EXT.1.2: The TOE, through a combination of Android’s multi-user capabilities and Security
Enhancements (SE) for Android, provides the ability to create an isolated container within the device. Within a
container a group of applications can be installed, and access to those applications is then restricted to usage solely
within the container. The container boundary restricts the ability of sharing data such that applications outside the
container cannot see, share or even copy data to those inside the container and vice versa. Exceptions to the
boundary (such as allowing a copy operation) must be configured by the administrator via policy. Furthermore, the
container boundary policy can control access to hardware features, such as the camera or microphone, and restrict
the ability of applications within the container to access those services.
FIA_AFL_EXT.1: The Knox Workspace container maintains, in Flash, the number of failed logins since the last
successful login, and upon reaching the maximum number of incorrect logins, the Knox Workspace container
performs a full wipe of data protected by Knox (i.e. data inside the container). An administrator can adjust the
number of failed logins for the hybrid and password login mechanism from the default of ten failed logins to a value
between one and thirty through an MDM.
FIA_UAU.5: The Knox Workspace container allows the user to authenticate using a password, or a hybrid method
requiring both a biometric and the password at the same time. The TOE prohibits other authentication mechanisms,
such as pattern, PIN, or biometric by themselves.
FIA_UAU.6(1)/FIA_UAU6(2): The Knox Workspace container requires the user to enter their password in order to
unlock the Knox Workspace container. Additionally the Knox Workspace container requires the user to confirm
their current password when accessing the “Knox Settings -> Knox unlock method” menu in the Knox Workspace
container’s user interface. Only after entering their current user password can the user then elect to change their
password.
FIA_UAU.7: The Knox Workspace container allows the user to enter the user's password from the Knox lock
screen. The Knox Workspace container will, by default, display the most recently entered character of the password
briefly or until the user enters the next character in the password, at which point the Knox Workspace container
obscures the character by replacing the character with a dot symbol.
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FMT_MOF.1/FMT_SMF_EXT.1: The Knox Workspace container grants the admin additional controls over the
container beyond those available to the device as a whole. The primary additional control is over sharing data to and
from the container.
The control over the camera and microphone within the Knox Workspace container only affects access to those
resources inside the container, not outside the container. If either of these is disabled outside the container then they
will not be available within the container, even if they are enabled.
In general the management functions for the Knox Workspace container are the same as those of the device as a
whole. Specific differences of the impact of a Knox Workspace container function are noted in Table 6 Security
Management Functions.
FTA_SSL_EXT.1: The Knox Workspace container transitions to its locked state either immediately after a user
initiates a lock by pressing the container lock button from the notification bar or after a configurable period of
inactivity, and as part of that transition, the Knox Workspace container will display a lock screen to obscure the
previous contents. When the Knox Workspace container is locked, it can still display calendar appointments and
other notifications allowed by the administrator to be shown outside the container (in the notification area). But
without authenticating first to the Knox Workspace container, a user cannot perform any related actions based upon
these container notifications (they cannot respond to emails, calendar appointments, or text messages).
The Knox Workspace container timeout is independent of the TOE timeout and as such can be set to different
values.
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7. TSF Inventory
Below is a list of user-mode TSF binaries and libraries. All are built with the -fstack-protector option set. For each
binary/library, the name, path and security function is provided.
Name Path Security Function
app_process system/bin APP
charon system/bin VPN
dalvikvm system/bin VM
gatekeeper.mdfpp.so
system/vendor/lib/hw,
system/vendor/lib64/hw
Keystore/Key Mgmt
gatekeeperd system/bin Keystore/Key Mgmt
icd system/bin Integrity
keystore system/bin Keystore
keystore.mdfpp.so system/vendor/lib64/hw Keystore
libcharon.so system/lib64 VPN
libcrypto.so system/lib, system/lib64 Crypto
libjavacrypto.so system/lib, system/lib64 Crypto JNI
libkeymaster_helper.so system/vendor/lib64 Keystore/Key Mgmt
libkeymaster_mdfpp.so system/vendor/lib64 Keystore/Key Mgmt
libkeymaster2_mdfpp.so system/vendor/lib64 Keystore/Key Mgmt
libkeystore_binder.so system/lib, system/lib64 Keystore
libknox_km.so system/lib, system/lib64 DAR
libmdf.so
system/lib, system/lib64,
system/vendor/lib,
system/vendor/lib64
CCMode
libQSEEComAPI.so
system/vendor/lib,
system/vendor/lib64
TrustZone Daemon
libsdp_crypto.so system/lib, system/lib64 DAR
libsdp_kekm.so system/lib, system/lib64 DAR
libsdp_sdk.so system/lib, system/lib64 DAR
libsec_ode_keymanager.so system/lib64 DAR
libsec_ode_keymaster.so system/lib64 DAR
libsec_ode_pbkdf.so system/lib, system/lib64 DAR
libsec_ode_sdcardencryption.so system/lib64 DAR
libsecure_storage.so
system/vendor/lib,
system/vendor/lib64
DAR
libsecure_storage_jni.so
system/vendor/lib,
system/vendor/lib64
DAR
libsoftkeymaster.so system/lib, system/lib64 Keystore/Key Mgmt
libssl.so system/lib, system/lib64 Crypto
libstrongswan.so system/lib64/ VPN
macloader system/vendor/bin/hw/macloader WLAN
mcDriverDaemon system/vendor/bin TrustZone Daemon
mdf_fota system/bin TrustZone Daemon
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Name Path Security Function
mfgloader system/vendor/bin/hw/macloader WLAN
qseecomd system/vendor/bin DAR
sdp_cryptod system/bin/ DAR
secure_storage_daemon system/bin FOTA
time_daemon system/vendor/bin Time
vold system/bin DAR
wlandutservice system/bin WLAN
wpa_supplicant system/vendor/bin/hw WLAN
Table 20 TSF Files Inventory