Hi,
first of: my familiarity with OpenSSH/Pam code-base is very limited..
Please excuse me if some of this does not make any sense or seems stupid!
I'm investigating if it is possible for a PAM module to find out which
public key was accepted (when 'AuthenticationMethods
publickey,keyboard-interactive' is used). From my digging in the source,
it seems it is currently not.
Would it be possible to provide this information? Maybe using
do_pam_putenv()? Would there be any security implications of doing this?
The reason I'm asking is that I'm looking into using 2FA (i.e. pubkey +
pam_google_authenticator) for *some* of my SSH keys. For example, a SSH
privkey on my trusted box can login without verification code, but
another SSH privkey on my not-as-trusted box requires a verification
code to login.
My initial thought was to implemented it through a pubkey whitelist in
the specific PAM module, but other solutions might also be possible.
Maybe a PAM module configured as "sufficient", which looks in a pubkey
whitelist and accepts immediately, skipping any further PAM modules
would work.
Thanks for any feedback!
Regards
Johan (who is not on the list and appreciates a direct CC!)
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