#672 - SSH-Agent-Forwarding in pyhoca-gui does not survive reconnects

X2Go Bug report logs - #672
SSH-Agent-Forwarding in pyhoca-gui does not survive reconnects

Reported by: Robert Siemer <Robert.Siemer-lists@backsla.sh>

Date: Wed, 12 Nov 2014 23:40:01 UTC

Severity: normal

Tags: pending

Found in version 4.0.1.18

Fixed in version 4.0.1.19

Done: X2Go Release Manager <git-admin@x2go.org>

Bug is archived. No further changes may be made.

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Subject: Bug#672: SSH-Agent-Forwarding in pyhoca-gui does not survive reconnects
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From: Robert Siemer <Robert.Siemer-lists@backsla.sh>
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Package: x2goserver Version: 4.0.1.18 Pyhoca-gui supports SSH-agent-forwarding, but that doesn’t survive a reconnect with session resumption. As far as I understand the following happens: (-pyhoca is configured to do SSH-agent-forwarding) -pyhoca connects via SSH to the X2Go server -the sshd creates a unix domain socket in /tmp/ssh-XXXXXX/agend.PID -the sshd sets SSH_AUTH_SOCKET containing the name of the socket -sshd starts whatever is requests by the X2Go client having that environment -SSH-agent-forwarding works whenever the SSH-connection dies (proper session suspend with disconnect or connection is “cut”) it continues like this: -SSH is connected again -unix domain socket and environment is set up, but -the programs (the X11 clients in a resumed X2Go session) are still running in the old environment with outdated SSH_AUTH_SOCKET info -the programs from before can’t access the SSH-agent -...unless the new value gets setup in the old environments possible fix is this: -X2Go on the server side does not start any new programs in the X2Go session or resumes an X2Go session, until: -an only-session-dependent symbolic link is set up pointing to the socket from SSH_AUTH_SOCKET -SSH_AUTH_SOCKET is set to that symbolic link Result: -as the name of symbolic link is fixed for the session, no environment variables need to be updated -the link always points to the socket created by the sshd for this connection -the ssh-agent can be reached

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X2Go Bug report logs - #672 SSH-Agent-Forwarding in pyhoca-gui does not survive reconnects

X2Go Bug report logs - #672
SSH-Agent-Forwarding in pyhoca-gui does not survive reconnects