[Bug 1975] Support for Match configuration directive to also include subsystems

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1975

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
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                 CC|                            |djm at mindrot.org

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
At present, this is not possible - the matching happens around
authentication time, well before the subsystem is requested.

It would be conceivably possible to add another pass through the config
file, but it would be pretty confusing since some combinations of
options would never make sense. E.g.

Match user djm subsystem sftp
    PasswordAuthentication no
    ChrootDirectory /blah

This could not be evaluated at authentication time and so the
PasswordAuthentication directive could not be applied.

Another approach might be to have another Match-like keywords that is
used just for stuff that happens later (say "SessionMatch") that could
therefore have access to session-time information. IMO that's confusing
and complicated in its own way too.

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