X2Go Bug report logs - #1295
x2goclient/broker mode : don't close on suspended session with --close-disconnect

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Message #5 received at submit@bugs.x2go.org (full text, mbox, reply):

From: Walid MOGHRABI <w.moghrabi@servicemagic.eu>

To: submit@bugs.x2go.org

Subject: x2goclient/broker mode : don't close on suspended session with --close-disconnect

Date: Wed, 9 May 2018 16:00:43 +0200 (CEST)

package: x2goclient
version: 4.1.2.0-0~1750~ubuntu16.04.1
priority: bug

In broker/tce mode, when I connect a new session on TCE-CLIENT-1, if I live migrate the running session on TCE-CLIENT-2, the session is detached from client 1 to client 2 correctly (suspended on client 1 and correctly resumed on client 2) but x2goclient doesn't close itself on client 1 once session is detached.
The client stays opened on the sessions profiles list with the currently logged in user instead of closing itself and getting back to the broker login prompt.

This is a major security issue since anyone can then just click on a session profile to connect with the current user credentials. 

Regards,
Walid Moghrabi

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Message #10 received at 1295@bugs.x2go.org (full text, mbox, reply):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

To: Walid MOGHRABI <w.moghrabi@servicemagic.eu>, 1295@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#1295: x2goclient/broker mode : don't close on suspended session with --close-disconnect

Date: Tue, 15 May 2018 12:01:03 +0000

[Message part 1 (text/plain, inline)]

Hi Walid,

On  Mi 09 Mai 2018 16:00:43 CEST, Walid MOGHRABI wrote:

> package: x2goclient
> version: 4.1.2.0-0~1750~ubuntu16.04.1
> priority: bug
>
> In broker/tce mode, when I connect a new session on TCE-CLIENT-1, if  
> I live migrate the running session on TCE-CLIENT-2, the session is  
> detached from client 1 to client 2 correctly (suspended on client 1  
> and correctly resumed on client 2) but x2goclient doesn't close  
> itself on client 1 once session is detached.

This per se is a bug, as --close-disconnect fails.

> The client stays opened on the sessions profiles list with the  
> currently logged in user instead of closing itself and getting back  
> to the broker login prompt.

I think --close-disconnect is not what you want. You want --broker-autologoff.

> This is a major security issue since anyone can then just click on a  
> session profile to connect with the current user credentials.

Understood. However, please check if you can achieve the correct  
behaviour with --broker-autologoff. It saves you the X2Go Client  
restarts on session logout.

Mike
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