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TD0243:  SSH Key-Based Authentication

Publication Date
2017.10.03

Protection Profiles
PP_OS_V4.1

Other References
FIA_UAU.5.1

Issue Description

FIA_UAU.5.1 provides a selection for authentication based on X.509 certificates. The default implementation of OpenSSH does not provide capabilities for x.509 authentication. While it is not a mandatory inclusion, many end-users will chose to disable password authentication in favor of using SSH Keys.

Resolution

FIA_UAU.5.1 is updated as follows to allow the use of SSH keys:

FIA_UAU.5 Multiple Authentication Mechanisms
The OS shall provide the following authentication mechanisms
[selection:

 

authentication based on user name and password,
authentication based on user name and a PIN that releases
an asymmetric key stored in OE-protected storage,
authentication based on X.509 certificates,

for use in SSH only, SSH public key-based authentication as specified by the Extended Package for Secure Shell

 

] to support user authentication.

 

 Application Note:

 

The "for use in SSH only, SSH public key-based authentication as specified by the Extended Package for Secure Shell" selection can only be included, and must be included, if FTP_ITC_EXT.1.1 selects "SSH as conforming to the Extended Package for Secure Shell".

Justification

Operating systems, like other technologies, should be allowed to support public key authentication without X.509 certificates for SSH.

 
 
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