[Bug 3930] New: check_pam_user() fails for AD users they do not match case

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Tue Feb 24 23:55:09 AEDT 2026


https://bugzilla.mindrot.org/show_bug.cgi?id=3930

            Bug ID: 3930
           Summary: check_pam_user() fails for AD users they do not match
                    case
           Product: Portable OpenSSH
           Version: 10.0p2
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: P5
         Component: PAM support
          Assignee: unassigned-bugs at mindrot.org
          Reporter: chsdik at gmail.com

When a user logged tries to login using lower case username, AD will
match it but returns the username in ALL CAPS; login then fails with:

debug1: PAM user "casper" does not match expected "CASPER"
PAM user mismatch

and the connection is severed.

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