bug#23960: lshd: X11 forwarding request failed on channel 0

[myglc2 <myglc2@gmail.com>]

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From 'Re: guixSD - problem with X11 forwarding' in help-guix@gnu.org

myglc2 <myglc2@gmail.com> writes:

> ludo@gnu.org (Ludovic Courtès) writes:
>
>> myglc2 <myglc2@gmail.com> skribis:
>>
>>> On guixSD, with no packages installed in the login user profile, I get
>>> 'X11 forwarding request failed on channel 0'
>>
>> [...]
>>
>>> debug1: channel 0: new [client-session]
>>> debug1: Entering interactive session.
>>> debug1: Requesting X11 forwarding with authentication spoofing.
>>> debug1: Sending environment.
>>> debug1: Sending env LANG = en_US.UTF-8
>>> X11 forwarding request failed on channel 0
>>
>> Right, I see that as well.
>>
>> lshd gives some clues in /var/log/messages:
>>
>> Feb 23 18:14:09 localhost lshd[430]: lshd: Updating utmp for login failed (errno = 2): No such file or directory 
>> Feb 23 18:14:09 localhost lshd[430]: lshd: xauth invocation failed: exit code: 127 
>> Feb 23 18:14:33 localhost lshd[430]: lshd: Updating utmpx for logout failed (errno = 2): No such file or directory 
>> Feb 23 18:14:33 localhost lshd[430]: lshd: write_buffer: Attempt to write data to closed buffer. 
>> Feb 23 18:14:33 localhost lshd[430]: lshd: Disconnect for reason 11: disconnected by user 
>>
>> Indeed, server_x11.c in lsh reads:
>>
>> #ifndef XAUTH_PROGRAM
>> # define XAUTH_PROGRAM "/usr/X11R6/bin/xauth"
>> #endif
>>
>> I believe this is fixed by commit da35acf.
>>
>> To give it a try, you can run (as root):
>>
>>   # guix pull
>>   # herd stop ssh-daemon
>>   # guix system reconfigure your-config.scm
>
> I tried the above. 'ssh -v ...' still produces results quoted above and
> I see in /var/log/messages:
>
> Feb 29 20:43:54 localhost lshd[6959]: lshd: Failed to cd to `/tmp/.X11-unix' (errno = 2): No such file or directory 
> Feb 29 20:43:54 localhost lshd[6959]: lshd: Updating utmp for login failed (errno = 2): No such file or directory 
> Feb 29 20:45:35 localhost lshd[6959]: lshd: Updating utmpx for logout failed (errno = 2): No such file or directory 
> Feb 29 20:45:35 localhost lshd[6959]: lshd: write_buffer: Attempt to write data to closed buffer. 
> Feb 29 20:45:35 localhost lshd[6959]: lshd: Disconnect for reason 11: disconnected by user 
> Feb 29 20:45:47 localhost lshd[6959]: lshd: Failed to cd to `/tmp/.X11-unix' (errno = 2): No such file or directory 
> Feb 29 20:45:47 localhost lshd[6959]: lshd: Updating utmp for login failed (errno = 2): No such file or directory 
>
> I tried 'sudo mkdir /tmp/.X11-unix' which changed /var/log/messages to:
>
> Feb 29 20:54:04 localhost lshd[6959]: lshd: Updating utmp for login failed (errno = 2): No such file or directory 
> Feb 29 20:54:09 localhost lshd[6959]: lshd: Updating utmpx for logout failed (errno = 2): No such file or directory 
> Feb 29 20:54:09 localhost lshd[6959]: lshd: write_buffer: Attempt to write data to closed buffer. 
> Feb 29 20:54:09 localhost lshd[6959]: lshd: Disconnect for reason 11: disconnected by user 
>
> and 'ssh -v ...' still produces the results quoted above.

Don't think this is fixed yet. ssh in to GuixSD gives ...

'X11 forwarding request failed on channel 0'

... and on GuixSD in /var/log/messages I see ...

Jul 12 16:25:42 localhost lshd[384]: lshd: Failed to cd to `/tmp/.X11-unix' (errno = 2): No such file or directory 
Jul 12 16:25:42 localhost lshd[384]: lshd: Updating utmp for login failed (errno = 2): No such file or directory 

... or after ...

sudo mkdir /tmp/.X11-unix

... I see ...

Jul 12 16:21:53 localhost lshd[384]: lshd: Updating utmpx for logout failed (errno = 2): No such file or directory 
Jul 12 16:21:53 localhost lshd[384]: lshd: write_buffer: Attempt to write data to closed buffer. 
Jul 12 16:21:53 localhost lshd[384]: lshd: Disconnect for reason 11: disconnected by user 
Jul 12 16:22:00 localhost lshd[384]: lshd: Updating utmp for login failed (errno = 2): No such file or directory 

I am running from a git checkout ...

g1@g1 ~/src/guix$ git branch -av | grep '* master'
* master                                   0885881 gnu: obs: Remove compiler flags for non-Intel hardware.
g1@g1 ~/src/guix$ stat /home/g1/.config/guix/latest | grep File:
  File: ‘/home/g1/.config/guix/latest’ -> ‘../../src/guix’


system and user configs attached. TIA - George


[-- Attachment #2: g1.scm --]
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(use-package-modules
 aspell
 gettext
 ghostscript ;; gs-fonts
 fonts ;; font-dejavu font-gnu-freefont-ttf
 base
 ssh rsync wget screen
 version-control
 emacs
  ;; so we can make guix w/o guix environment
 autotools ;; automake
 texlive ;; texlive-minimal
 curl
 xorg certs
 graphviz
 )
(packages->manifest
 (list
  ;;  gnu-gettext
  ;; gs-fonts font-dejavu font-gnu-freefont-ttf
  ;; gnu-make
  ;; openssh nss-certs xauth rsync wget git git-manpages
  ;; emacs magit screen
  aspell aspell-dict-en
  ;; ;; so we can make guix w/o guix environment
  ;; texlive-minimal  automake
  curl ;; lpaste
  ;; graphviz
   ))

[-- Attachment #3: system.scm --]
[-- Type: application/octet-stream, Size: 2249 bytes --]

(use-modules (gnu))
(use-service-modules networking ssh)
(use-package-modules
 admin
 disk
 aspell
 gettext
 ghostscript ;; gs-fonts
 fonts ;; font-dejavu font-gnu-freefont-ttf
 base
 ssh rsync wget screen
 version-control
 emacs
 ;; so we can make guix w/o guix environment
 autotools ;; automake
 texinfo
 texlive ;; texlive
 ;; curl
 xorg certs
 graphviz
 qemu
 )
(operating-system
  (host-name "g1")
  (timezone "America/New_York")
  (locale "en_US.utf8")
  (bootloader (grub-configuration (device "/dev/sda")))
  (file-systems (cons (file-system
			(device "g1sd")
			(title 'label)
			(mount-point "/")
			(type "ext4"))
		      %base-file-systems))
  (users (cons* (user-account
		 (name "glc")
		 (comment "g l c")
		 (group "users")
		 (supplementary-groups '("wheel"))
		 (home-directory "/home/glc"))
		(user-account
		 (name "g1")
		 (comment "g1")
		 (group "users")
		 (supplementary-groups '("wheel" "kvm"))
		 (home-directory "/home/g1"))
		(user-account
		 (name "glc2")
		 (comment "glc2")
		 (group "users")
		 (supplementary-groups '("wheel"))
		 (home-directory "/home/glc2"))
		(user-account
		 (name "glc3")
		 (comment "glc3")
		 (group "users")
		 (supplementary-groups '("wheel"))
		 (home-directory "/home/glc3"))
		(user-account
		 (name "glc4")
		 (comment "glc4")
		 (group "users")
		 (supplementary-groups '("wheel"))
		 (home-directory "/home/glc4"))
		(user-account
		 (name "glc5")
		 (comment "glc5")
		 (group "users")
		 (supplementary-groups '("wheel"))
		 (home-directory "/home/glc5"))
		(user-account
		 (name "glc6")
		 (comment "glc6")
		 (group "users")
		 (supplementary-groups '("wheel"))
		 (home-directory "/home/glc6"))
		%base-user-accounts))
  (packages
   (cons*
    glibc-utf8-locales
    parted
    gs-fonts font-dejavu font-gnu-freefont-ttf
    gnu-make
    openssh nss-certs xauth rsync wget git git-manpages
    emacs-markdown-mode emacs-web-mode flycheck
    screen
    emacs magit aspell aspell-dict-en emacs-zenburn-theme paredit
    ;; so we can make guix w/o guix environment
    texinfo
    texlive-minimal
    automake
    ;; curl ;; lpaste
    graphviz
    qemu
    %base-packages))
  (services (cons* (dhcp-client-service)
		   (lsh-service #:port-number 22)
		   %base-services)))