[Bug 3552] New: ssh_config option RevokedHostKeys doesn't do tilde expansion on the filename

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3552

            Bug ID: 3552
           Summary: ssh_config option RevokedHostKeys doesn't do tilde
                    expansion on the filename
           Product: Portable OpenSSH
           Version: 9.0p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: daniel at spatof.org

Thanks to GitHub's private key leak I got to use the RevokedHostKeys
setting in ssh_config, and I realized it doesn't do tilde expansion on
the filename.

Specifically, this doesn't work and gives a "No such file or directory"
error:

  RevokedHostKeys ~/.ssh/revoked_host_keys

but this does work:

  RevokedHostKeys /Users/my_user/.ssh/revoked_host_keys

This was tested on OpenSSH 9.0p1 on macOS 13.2.1; I can't test on the
latest OpenSSH, but I did a quick search on the OpenSSH code on GitHub
and I think this bug is still present.

The IdentityFile option do tilde expansion:
https://github.com/openbsd/src/blob/fba4865f1dbe0cc6c4725437366d812456e9331d/usr.bin/ssh/ssh.c#L2265

The RevokedHostKeys option does not:
https://github.com/openbsd/src/blob/fba4865f1dbe0cc6c4725437366d812456e9331d/usr.bin/ssh/authfile.c#L385

Slightly related, the ssh_config man page doesn't specify that the
plain text version of the RevokedHostKeys file can contain comments.

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