X2Go Bug report logs - #448
x2goclient won't connect with ssh agent (Q: Who was so afraid of the NSA that he disabled agent communication in x2go?)

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Package: x2goclient; Maintainer for x2goclient is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goclient is src:x2goclient.

Reported by: Stefan Baur <newsgroups.mail2@stefanbaur.de>

Date: Thu, 6 Mar 2014 17:55:02 UTC

Severity: normal

Tags: pending

Found in version 4.0.2.0

Fixed in version 4.0.2.0

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

Bug is archived. No further changes may be made.

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From: owner@bugs.x2go.org (X2Go Bug Tracking System)
Subject: Bug#448 closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
 (X2Go issue (in src:x2goclient) has been marked as closed)
Message-ID: <handler.448.c.139713076530160.notifdone@bugs.x2go.org>
References: <20140410115214.3C7BE3BC4C@ymir.das-netzwerkteam.de>
X-X2go-PR-Keywords: pending
X-X2go-PR-Message: they-closed 448
X-X2go-PR-Package: x2goclient
X-X2go-PR-Source: x2goclient
Date: Thu, 10 Apr 2014 11:55:10 +0000
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This is an automatic notification regarding your Bug report
which was filed against the x2goclient package:

#448: x2goclient won't connect with ssh agent (Q: Who was so afraid of the NSA that he disabled agent communication in x2go?)

It has been closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Mike Gabriel <mike.gabriel@das-netzwerkteam.de> by
replying to this email.


-- 
X2Go Bug Tracking System
Contact owner@bugs.x2go.org with problems
[Message part 2 (message/rfc822, inline)]
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: 448-submitter@bugs.x2go.org
Cc: control@bugs.x2go.org, 448@bugs.x2go.org
Subject: X2Go issue (in src:x2goclient) has been marked as closed
Date: Thu, 10 Apr 2014 13:52:14 +0200 (CEST)
close #448
thanks

Hello,

we are very hopeful that X2Go issue #448 reported by you
has been resolved in the new release (4.0.2.0) of the
X2Go source project »src:x2goclient«.

You can view the complete changelog entry of src:x2goclient (4.0.2.0)
below, and you can use the following link to view all the code changes
between this and the last release of src:x2goclient.

    http://code.x2go.org/gitweb?p=x2goclient.git;a=commitdiff;h=cbe900f245206ad9bd62d0fbaf226da1b3ffc44e;hp=f7cdada8c57c45ee9ea3b6c42bd680fae26d728c

If you feel that the issue has not been resolved satisfyingly, feel
free to reopen this bug report or submit a follow-up report with
further observations described based on the new released version
of src:x2goclient.

Thanks a lot for contributing to X2Go!!!

light+love
X2Go Git Admin (on behalf of the sender of this mail)

---
X2Go Component: src:x2goclient
Version: 4.0.2.0-0x2go1
Status: RELEASE
Date: Thu, 10 Apr 2014 13:47:56 +0200
Fixes: 138 349 422 440 446 448 453
Changes: 
 x2goclient (4.0.2.0-0x2go1) RELEASED; urgency=low
 .
   [ Oleksandr Shneyder ]
   * New upstream version (4.0.2.0):
     - Revrite SSH Classes to support libssh fix.
     - Add Class HelpDialog to show options in scroll area.
     - Fix authentication on SSH Broker with key + passphrase.
     - Set modmap timer timeout to 10 sec on Mac.
     - Fix running xmodmap if X2Go Client not started from terminal.
     - Setting keyboard modifiers with xmodmap.
     - Fix multimonitor support on Linux.
     - Display more version info. Parameters --version, --git, --changelog.
     - Don't show GUI dialog for --version, --help, etc, if started
       from terminal on linux and mac.
     - If no user in session config, display system username in pass form.
     - Check if txt/changelog and txt/git exist on config phase.
       Rename option "--git" to "--git-info".
     - Change x2goclient.nsi for nightly builds.
 .
   [ Josh Lukens ]
   * New upstream version (4.0.2.0):
     - Switch to QNetworkAccessManager. Appropriately set content type
       header to "application/x-www-form-urlencoded" for HTTP post
       requests. (Fixes: #440, #138).
     - Fix copy+paste errors in QNetworkAccessManager code.
     - Provide support for dynamic authentication IDs. This is
       a requirement for using the broker client against brokers
       that use some sort of OTP authentication mechanism.
       (Fixes: #446).
 .
   [ Mike Gabriel ]
   * New upstream version (4.0.2.0):
     - Drop create_text.sh again, implement changelog copying
       in distro build files. Implement Git history creation for
       nightly builds in build scripts.
     - Rename txt/git to txt/git-info (make it compliant with cmdline
       options).
     - Allow starting shadow sessions from the command line with
       option --hidden being enabled. (Fixes: #349).
   * debian/control:
     + Build-depend on libssh-dev (>= 0.5.4-2).
     + Bump Standards: to 3.9.5. No changes needed.
   * debian/rules:
     + Copy debian/changelog into txt/ subfolder during dh_auto_configure.
     + Create txt/git-info files for ChangeLog.git if it exists.
   * x2goclient.spec:
     + Copy ChangeLog (or debian/changelog) into txt/ subfolder during
       %setup.
     + Copy ChangeLog.gitlog (if present) into txt/ subfolder during %setup.
     + B-R (epel-7): man2html-core (same as for Fedora builds).
 .
   [ Mike DePaulo ]
   * New upstream version (4.0.2.0):
     - Decrease HelpDialog's tab width from 320 to 30
       (the width of 10 spaces.) (Fixes: #453)
     - Windows: Fix compatibility with PulseAudio 3.0 & later through
       new cookie handling. (Fixes: #422)
     - Windows: Upgrade included PulseAudio from 1.1 to 5.0.
       The 5.0 build is patched for X2Go bug #363. and available here:
         https://build.opensuse.org/project/show/home:mikedep333:branches:home:\
         mkbosmans:mingw32:pulseaudio
     - Windows: Reapply KDE on Windows's patch for Pageant support to
       libssh 0.5.5. (Fixes: #448)

[Message part 3 (message/rfc822, inline)]
From: Stefan Baur <newsgroups.mail2@stefanbaur.de>
To: submit@bugs.x2go.org, Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, Michael DePaulo <mikedep333@gmail.com>
Subject: x2goclient won't connect with ssh agent (Q: Who was so afraid of the NSA that he disabled agent communication in x2go?)
Date: Thu, 06 Mar 2014 18:45:21 +0100
Package: x2goclient
Version: 4.0.2.0

(I'm filing this against 4.0.2.0 b/c it's still present there. If bugs
should be filed against the version they initially appeared in, please
let me know)

not affected: 4.0.0.3 with PulseAudio 0.9.6
not affected: 4.0.1.2 with PulseAudio 0.9.6
possibly affected (untested) 4.0.1.3 with PulseAudio 0.9.6
affected: 4.0.1.3+build2 with PulseAudio 0.9.6
affected: 4.0.2.0

Preface:
The followin issue has been observed on Windows; whoever takes care of
this should also check if the same issue occurs on Linux and Mac when
using the ssh agents shipped with these operating systems.

Situation:
4.0.1.2 with PulseAudio 0.9.6 and older clients allowed the use of an
external SSH agent that loads and memorizes SSH private keys (so you
don't have to re-enter your private key's passphrase whenever you try to
connect).
In my case, this SSH agent was "Pageant" from the PuTTY package.

With 4.0.1.3+build2/PA0.9.6, using the same (registry-stored) settings
as before, x2goclient.exe pops up a dialog box asking me for my private
key's password. Which it does over and over again, without ever connecting.
To me, it looks like it's asking for the password for a non-existant
private key, the key with the file name "", thus it always fails.

Assumption:
Someone tried to add/fix code regarding ssh public key authentication
(maybe something to do with bug #322?), took care of whatever issue
there was with private key file handling by x2goclient itself, but
overlooked the possibility that an external ssh agent might be involved.

Net Result:
SSH public key login using an SSH agent is effectively broken in
4.0.1.3+build2 (and possibly 4.0.1.3), up to 4.0.2.0-2014-03-06 (nightly
build), and probably still broken in the current source.

Sounds like a case for one of our two Mikes ...

-Stefan

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