[Bug 3915] New: Add helpful error message if configured AuthorizedPrincipalsFile cannot be read

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3915

            Bug ID: 3915
           Summary: Add helpful error message if configured
                    AuthorizedPrincipalsFile cannot be read
           Product: Portable OpenSSH
           Version: 9.6p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: u20230201 at gmail.com

Trying user certificates I made a configuration error that caused the
principals file to be missing (see
https://unix.stackexchange.com/q/804186/320598 for details).
Unfortunately there was no error message corresponding to the open of
the file failing with "no such file or directory", not even at debug
level 3.

If such a message had existed, I would have found my typing error much
earlier!

Therefore I suggest to report configured files that could not be
opened, accompanied by the proper error code or message (for a moment I
had thought it might be a permission problem, but actually the file dis
not exist at all).

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