[Bug 3906] Misusing 'Match Host' in server config causes a crash at deferred connection time

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3906

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |3880
                 CC|                            |dtucker at dtucker.net

--- Comment #1 from Darren Tucker <dtucker at dtucker.net> ---
(In reply to egberts from comment #0)
> Ok, I misused 'Host' in sshd_config as in:

What you did looks fine.  It certainly should not be crashing.

>     Match Host 127.0.0.1
>     Subsystem sftp internal-sftp

The problem is in the handling of Subsystem inside the Match block. 
I'm not sure exactly why yet, but Subsystem has some special handling
so I would guess it's related to that.

> And the server daemon comes up ok, no invalidation, no early exit,
> just open the port and wait.
> 
> Running: OpenSSH_10.0p2 Debian-7, OpenSSL 3.5.4 30 Sep 2025
> 
> Checked out github openssh to tag 'upstream/10.0p1' (p2 is not
> available).

Due to an error in the release process, what was intended as the 10.0p1
release reported itself as 10.0p2, so we consider them equivalent.


Referenced Bugs:

https://bugzilla.mindrot.org/show_bug.cgi?id=3880
[Bug 3880] Tracking bug for openssh-10.3
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