GNU bug report logs - #22930
X11 forwarding fails without /tmp/.X11-unix directory

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Package: guix;

Reported by: myglc2 <myglc2 <at> gmail.com>

Date: Mon, 7 Mar 2016 01:09:01 UTC

Severity: normal

Merged with 23960, 24049

Done: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>

Bug is archived. No further changes may be made.

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Report forwarded to bug-guix <at> gnu.org:
bug#22930; Package guix. (Mon, 07 Mar 2016 01:09:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to myglc2 <myglc2 <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-guix <at> gnu.org. (Mon, 07 Mar 2016 01:09:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: myglc2 <myglc2 <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: X11 forwarding fails without /tmp/.X11-unix directory
Date: Sun, 06 Mar 2016 20:10:33 -0500
[Message part 1 (text/plain, inline)]
Example: using guix commit 59a4dd5 with openssh xauth & emacs in the
user profile (c02glc.scm) and a minimal system profile (c02system.scm),
after a reboot we see ...

nemo:~ $ ssh g1
glc <at> g1's password:
X11 forwarding request failed on channel 0

... and in /var/log/messages ...

Mar  6 19:23:35 localhost lshd[372]: lshd: Failed to cd to `/tmp/.X11-unix' (errno = 2): No such file or directory 
Mar  6 19:23:35 localhost lshd[372]: lshd: Updating utmp for login failed (errno = 2): No such file or directory 

If we do ...

mkdir /tmp/.X11-unix

... logout and login, forwarding works, emacs runs in X, and
/var/log/messages is clean. If we reboot, X11 forwarding again fails.

[c02glc.scm (application/octet-stream, attachment)]
[c02system.scm (application/octet-stream, attachment)]

Merged 22930 23960. Request was from ludo <at> gnu.org (Ludovic Courtès) to control <at> debbugs.gnu.org. (Mon, 01 Aug 2016 09:54:02 GMT) Full text and rfc822 format available.

Merged 22930 23960 24049. Request was from ludo <at> gnu.org (Ludovic Courtès) to control <at> debbugs.gnu.org. (Mon, 01 Aug 2016 09:54:02 GMT) Full text and rfc822 format available.

Reply sent to Maxim Cournoyer <maxim.cournoyer <at> gmail.com>:
You have taken responsibility. (Tue, 06 Oct 2020 04:05:02 GMT) Full text and rfc822 format available.

Notification sent to myglc2 <myglc2 <at> gmail.com>:
bug acknowledged by developer. (Tue, 06 Oct 2020 04:05:02 GMT) Full text and rfc822 format available.

Message #14 received at 22930-done <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: myglc2 <myglc2 <at> gmail.com>, 24049-done <at> debbugs.gnu.org,
 22930-done <at> debbugs.gnu.org
Subject: Re: bug#24049: GuixSD - problem with X11 forwarding
Date: Tue, 06 Oct 2020 00:04:26 -0400
[Message part 1 (text/plain, inline)]
Hello,

ludo <at> gnu.org (Ludovic Courtès) writes:

[...]

> I believe this is a bug in lshd fixed by something along the lines of
> the attached patch.
>
> Niels, what do you think?
>
> (Strangely I can’t find equivalent code in OpenSSH.)
>
> Thanks,
> Ludo’.
>
> --- /tmp/lsh-2.1/src/server_x11.c	2016-08-01 11:58:54.714647794 +0200
> +++ /tmp/lsh-2.1/src/server_x11.c.new	2016-08-01 11:58:46.606563478 +0200
> @@ -151,7 +151,7 @@ DEFINE_COMMAND(open_forwarded_x11)
>  #define X11_MIN_DISPLAY 10
>  #define X11_MAX_DISPLAY 1000
>  
> -/* FIXME: Create the /tmp/.X11-unix directory, if needed. Figure out
> +/* FIXME: Figure out
>   * if and how we should use /tmp/.X17-lock. Consider using display
>   * "unix:17" instead of just ":17".
>   */
> @@ -253,6 +253,7 @@ open_x11_socket(struct ssh_channel *chan
>  
>    old_umask = umask(0077);
>    
> +  mkdir(X11_SOCKET_DIR, S_IRWXU | S_IRWXG | S_IRWXO | S_ISVTX);
>    old_cd = lsh_pushd(X11_SOCKET_DIR, &dir, 0, 0);
>    if (old_cd < 0)
>      {

I tried the above fix and ran a VM with the attached config (the custom
kernel stuff was to try something else at the same time).  It fixes the
error about the directory, but it would still fail at X11 forwarding
(there was an error message: "Can't find any xauth information for X11
display").

I ended up figuring out it needed libxau to work; combined with your
patch, this fixes X11 forwarding.

Fixed in commit 0ec195ff02.

For the record, I've done the tests in a VM using the attached system
config.  The custom kernel stuff is unrelated.

Thanks,

Closing,

Maxim

[config-custom-kernel.scm (text/plain, attachment)]

Reply sent to Maxim Cournoyer <maxim.cournoyer <at> gmail.com>:
You have taken responsibility. (Tue, 06 Oct 2020 04:05:02 GMT) Full text and rfc822 format available.

Notification sent to myglc2 <myglc2 <at> gmail.com>:
bug acknowledged by developer. (Tue, 06 Oct 2020 04:05:02 GMT) Full text and rfc822 format available.

Reply sent to Maxim Cournoyer <maxim.cournoyer <at> gmail.com>:
You have taken responsibility. (Tue, 06 Oct 2020 04:05:02 GMT) Full text and rfc822 format available.

Notification sent to myglc2 <myglc2 <at> gmail.com>:
bug acknowledged by developer. (Tue, 06 Oct 2020 04:05:03 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Tue, 03 Nov 2020 12:24:06 GMT) Full text and rfc822 format available.

This bug report was last modified 4 years and 225 days ago.

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