We checked what actually is the backend that the "ssh-add -c" is trying to
reach.
First we thought that should be the ssh-agent spawned for gnome-keyring-daemon
[1]
In PS that is visible as:
1 1000 4029 1 20 0 656132 15860 - SLl ? 0:24
/usr/bin/gnome-keyring-daemon --daemonize --login
0 1000 26372 4029 20 0 11304 3696 - S ? 0:00 \_
/usr/bin/ssh-agent -D -a /run/user/1000/keyring/.ssh
Note: there is also another ssh-agent running:
0 1000 4047 4036 20 0 568216 14944 poll_s Sl+ tty2 0:00
\_ /usr/lib/gnome-session/gnome-session-binary --session=ubuntu
1 1000 4146 4047 20 0 11304 320 - Ss ? 0:00
\_ /usr/bin/ssh-agent /usr/bin/im-launch env GNOME_SHELL_SESSION_MODE=ubuntu
gnome-session --session=ubuntu
That binary is the one of the openssh package that we have proven before to
work fine.:
$ dpkg -S /usr/bin/ssh-agent
openssh-client: /usr/bin/ssh-agent
But it is interesting that it uses
-a /run/user/1000/keyring/.ssh
But the env var is actually different (no . in the filename):
$ echo $SSH_AUTH_SOCK
/run/user/1000/keyring/ssh
But look at the ownership of the socket that we found in the env var:
$ sudo lsof +fg /run/user/1000/keyring/ssh
COMMAND PID USER FD TYPE FILE-FLAG DEVICE SIZE/OFF
NODE NAME
gnome-key 4029 paelzer 14u unix RW,ND,0x80000 0xffff910ac4316800 0t0
130189 /run/user/1000/keyring/ssh type=STREAM
So while there is a real /usr/bin/ssh-agent running the actual socket
that the env variable points to is actually owned by gnome-keyring
process.
Above we have proven that with a classic ssh-agent it works fine (comment #6).
The bug task for openssh is invalid for now due to that.
Maybe the gnome-keyring backend doesn't even have the -c feature [1] doesn't
list it - then it would be a feature request there.
But in any case we need to re-triage that at gnome-keyring, so that is the
package I'm adding a bug task for.
[1]: https://wiki.gnome.org/Projects/GnomeKeyring/Ssh
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https://bugs.launchpad.net/bugs/1812247
Title:
ssh-askpass(-gnome) fails for ssh-add -c: agent refused operation
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