openssh bugs - Jul 2011 - [Bug 1922] New: Disabling ChallengeResponseAuthentication also disables KbdInteractiveAuthentication

https://bugzilla.mindrot.org/show_bug.cgi?id=1922

             Bug #: 1922
           Summary: Disabling ChallengeResponseAuthentication also
                    disables KbdInteractiveAuthentication
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 5.8p2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sshd
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: maxb at f2s.com


I was chasing some unexpected behaviour from OpenSSH, and have come
across an oddity in the source code which feels like a bug.

In auth2-kbdint.c, the Authmethod struct declares
options.kbd_interactive_authentication as the enabled flag for this
method. However in the implementation function a few lines above, it
checks options.challenge_response_authentication to decide whether to
actually proceed with the authentication.

This results in the behaviour of "ChallengeResponseAuthentication no"
also disabling keyboard-interactive authentication, even if
"KbdInteractiveAuthentication yes" is specified.

(Also, the KbdInteractiveAuthentication option isn't explicitly
documented in the manpages, so I'm unsure if it's actually intended to
be used or not.)

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