GNU bug report logs - #55335
openssh-service no longer listens on IPv6

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#55335: closed (openssh-service no longer listens on IPv6)
Date: Sun, 22 May 2022 20:09:01 +0000

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Your message dated Sun, 22 May 2022 22:08:46 +0200
with message-id <87a6b9qqi9.fsf <at> gnu.org>
and subject line Re: bug#55335: openssh-service no longer listens on IPv6
has caused the debbugs.gnu.org bug report #55335,
regarding openssh-service no longer listens on IPv6
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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55335: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=55335
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From: Christopher Baines <mail <at> cbaines.net>
To: bug-guix <at> gnu.org
Subject: openssh-service no longer listens on IPv6
Date: Mon, 09 May 2022 11:39:47 +0100

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This looks to be a recent regression, probably connected with the
shepherd now doing the listening, rather than sshd itself.

Previously, you could use both IPv4 and IPv6.

  netstat -tlnp | grep sshd
  tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      26683/sshd: /gnu/st
  tcp6       0      0 :::22                   :::*                    LISTEN      26683/sshd: /gnu/st

Now though, it looks like with shepherd doing the listening, you can
only use IPv4.

  netstat -tlnp | grep 22
  tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1/guile


On an affected machine, you can reproduce this by trying to SSH over v6.

  cbaines <at> lakeside ~$ ssh 127.0.0.1
  The authenticity of host '127.0.0.1 (127.0.0.1)' can't be established.
  ED25519 key fingerprint is SHA256:1wV7w84awrGv5ilP5e8k5ygIvSkXSJ6LIy3MnqZG2Jw.
  This key is not known by any other names
  Are you sure you want to continue connecting (yes/no/[fingerprint])? ^C

  cbaines <at> lakeside ~$ ssh ::1
  ssh: connect to host ::1 port 22: Connection refused


This isn't an issue if you're not using IPv6, but if you have a machine
only accessible via IPv6, then you can't ssh in. The main workaround
I've found is getting access via other means, then starting sshd
listening on a different port (as the shepherd is using 22).

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From: Ludovic Courtès <ludo <at> gnu.org>
To: 55335-done <at> debbugs.gnu.org, Christopher Baines <mail <at> cbaines.net>, Jack
 Hill <jackhill <at> jackhill.us>
Subject: Re: bug#55335: openssh-service no longer listens on IPv6
Date: Sun, 22 May 2022 22:08:46 +0200

Hello!

With Shepherd 0.9.1 released, I believe Guix commit
d2b3400f79ffaed3357650307376ab69a7ec3b1b fixes this bug for good, also
adding a system test for SSH access over IPv6 (both with OpenSSH and
Dropbear).

Let me know if anything’s amiss!

Thanks,
Ludo’.

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