#784 - x2gobroker-agent.pl commands break if user shell environment has login settings it doesn't like

X2Go Bug report logs - #784
x2gobroker-agent.pl commands break if user shell environment has login settings it doesn't like

Reported by: Jason Alavaliant <alavaliant@ra09.com>

Date: Tue, 10 Feb 2015 05:55:01 UTC

Severity: normal

Tags: fixed, pending

Found in version 0.0.2.3

Fixed in version 0.0.3.0

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

Bug is archived. No further changes may be made.

X-Loop: owner@bugs.x2go.org
Subject: Bug#784: [X2Go-Dev] Bug#784: x2gobroker-agent.pl commands break if user shell environment has login settings it doesn't like
Reply-To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 784@bugs.x2go.org
Resent-From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Resent-To: x2go-dev@lists.x2go.org
Resent-CC: X2Go Developers <x2go-dev@lists.x2go.org>
X-Loop: owner@bugs.x2go.org
Resent-Date: Tue, 10 Feb 2015 08:25:02 +0000
Resent-Message-ID: <handler.784.B784.142355660316744@bugs.x2go.org>
Resent-Sender: owner@bugs.x2go.org
X-X2Go-PR-Message: followup 784
X-X2Go-PR-Package: x2gobroker-agent
X-X2Go-PR-Keywords: 
Received: via spool by 784-submit@bugs.x2go.org id=B784.142355660316744
          (code B ref 784); Tue, 10 Feb 2015 08:25:02 +0000
Received: (at 784) by bugs.x2go.org; 10 Feb 2015 08:23:23 +0000
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on
	ymir.das-netzwerkteam.de
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,URIBL_BLOCKED
	autolearn=ham version=3.3.2
Received: from freya.das-netzwerkteam.de (freya.das-netzwerkteam.de [88.198.48.199])
	by ymir.das-netzwerkteam.de (Postfix) with ESMTPS id 1ED205DBCA
	for <784@bugs.x2go.org>; Tue, 10 Feb 2015 09:23:21 +0100 (CET)
Received: from grimnir.das-netzwerkteam.de (grimnir.das-netzwerkteam.de [78.46.204.98])
	by freya.das-netzwerkteam.de (Postfix) with ESMTPS id B126FAF6;
	Tue, 10 Feb 2015 09:23:20 +0100 (CET)
Received: from localhost (localhost [127.0.0.1])
	by grimnir.das-netzwerkteam.de (Postfix) with ESMTP id 9084D3C1B3;
	Tue, 10 Feb 2015 09:23:20 +0100 (CET)
X-Virus-Scanned: Debian amavisd-new at grimnir.das-netzwerkteam.de
Received: from grimnir.das-netzwerkteam.de ([127.0.0.1])
	by localhost (grimnir.das-netzwerkteam.de [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id GFR2MHqexL2q; Tue, 10 Feb 2015 09:23:20 +0100 (CET)
Received: from grimnir.das-netzwerkteam.de (localhost [127.0.0.1])
	by grimnir.das-netzwerkteam.de (Postfix) with ESMTPS id 5B9013C045;
	Tue, 10 Feb 2015 09:23:20 +0100 (CET)
Received: from 134.245.44.4 ([134.245.44.4]) by mail.das-netzwerkteam.de
 (Horde Framework) with HTTP; Tue, 10 Feb 2015 08:23:20 +0000
Date: Tue, 10 Feb 2015 08:23:20 +0000
Message-ID: <20150210082320.Horde.Ux2rIQx6x4VgeCS6VpAbUg1@mail.das-netzwerkteam.de>
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Jason Alavaliant <alavaliant@ra09.com>, 784@bugs.x2go.org
In-Reply-To: <981e2e7256215a6351c339829d0e9d67@private.ra09.com>
User-Agent: Internet Messaging Program (IMP) H5 (6.2.2)
Accept-Language: de,en
Organization: DAS-NETZWERKTEAM
X-Originating-IP: 134.245.44.4
X-Remote-Browser: Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101
 Firefox/32.0 Iceweasel/32.0
Content-Type: multipart/signed; boundary="=_yDwoVzrZiIMbpXQFp59Opg9";
 protocol="application/pgp-signature"; micalg=pgp-sha1
MIME-Version: 1.0

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

Control: tag -1 pending Control: tag -1 fixed 0.3.0.0 Hi Jason, On Di 10 Feb 2015 06:13:52 CET, Jason Alavaliant wrote: > Package: x2ggobroker-agent > Version: 0.0.2.3 > > One of my users started to get their connections to the x2go broker > failing with 'Error downloading http://x2go-broker-url/plain/inifile > - server replied: Internal Server Error' > > Tracking back through the commands the broker was logging the issue > turned out be > > /usr/lib/x2go/x2gobroker-agent $USER listsessions > (and other commands that x2gobroker-agent.pl runs by su - username > -c command) returning things like > > OK > [1] 32542 > klipper: Command not found. > [1] + exit 1 klipper > > which was a result of how the command is run; since the > x2gobroker-agent $USER FOO commands all internally su to the named > user to run the command it results in the user's environment being > sourced which puts them at the risk of being broken by the user's > environment. My user in this case had embedded a command that > didn't exist on the broker host to run as soon as their shell > environment was created which caused the broker to error out. > (possibly compounded by in this case the shell tcsh being used as > the user's default shell - tcsh in my experience being very > temperamental with it's startup files - a single failure will stop > the environment file sourcing to error our instantly and not process > further lines. I've not had time to cross compare with bash etc and > see if this problem only exists for tcsh or if it effects most > shells). > > I managed to work around the issue in my case by fixing the su > commands in x2gobroker-agent.pl to use /bin/sh (which links to > /bin/dash) on my system to avoid user shell startup file environment > issues breaking logging in via the broker. It feels more like a > workaround that a proper fix to me so I'm not suggesting the > attached patch for merging, rather just as an example of how I got > around it in my case. My feeling is that there must be a better > way to ensure these x2gobroker-agent commands can't be broken by the > user env but I'm not managing to come up with a better solution > currently. > > Thanks > Jason This issue is already fixed in Git and pending for 0.0.3.0. I have marked the appropriate changelog line and added a closure there for this bug. Mike -- DAS-NETZWERKTEAM mike gabriel, herweg 7, 24357 fleckeby fon: +49 (1520) 1976 148 GnuPG Key ID 0x25771B31 mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de freeBusy: https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xfb

[Message part 2 (application/pgp-signature, inline)]

X2Go Developers <owner@bugs.x2go.org>. Last modified: Fri Oct 24 17:33:07 2025; Machine Name: ymir.das-netzwerkteam.de

X2Go Bug tracking system

Debbugs is free software and licensed under the terms of the GNU Public License version 2. The current version can be obtained from https://bugs.debian.org/debbugs-source/.

X2Go Bug report logs - #784 x2gobroker-agent.pl commands break if user shell environment has login settings it doesn't like

X2Go Bug report logs - #784
x2gobroker-agent.pl commands break if user shell environment has login settings it doesn't like