X2Go Bug report logs - #1003
x2goclient sshd (for folder sharing) weak host key

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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: Florian Wicke - Hetzner Online GmbH <florian.wicke@hetzner.de>

Date: Thu, 25 Feb 2016 15:20:01 UTC

Severity: normal

Tags: pending

Fixed in version

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

Bug is archived. No further changes may be made.

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From: owner@bugs.x2go.org (X2Go Bug Tracking System)
Subject: Bug#1003 closed by X2Go Release Manager <git-admin@x2go.org>
 (X2Go issue (in src:x2goclient) has been marked as closed)
Message-ID: <handler.1003.c.147425859311800.notifdone@bugs.x2go.org>
References: <20160919041606.CB3FE5DA94@ymir.das-netzwerkteam.de>
X-X2go-PR-Keywords: pending
X-X2go-PR-Message: they-closed 1003
X-X2go-PR-Package: x2goclient
X-X2go-PR-Source: x2goclient
Date: Mon, 19 Sep 2016 04:20:11 +0000
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[Message part 1 (text/plain, inline)]
This is an automatic notification regarding your Bug report
which was filed against the x2goclient package:

#1003: x2goclient sshd (for folder sharing) weak host key

It has been closed by X2Go Release Manager <git-admin@x2go.org>.

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 X2Go Release Manager <git-admin@x2go.org> by
replying to this email.

X2Go Bug Tracking System
Contact owner@bugs.x2go.org with problems
[Message part 2 (message/rfc822, inline)]
From: X2Go Release Manager <git-admin@x2go.org>
To: 1003-submitter@bugs.x2go.org
Cc: control@bugs.x2go.org, 1003@bugs.x2go.org
Subject: X2Go issue (in src:x2goclient) has been marked as closed
Date: Mon, 19 Sep 2016 06:16:06 +0200 (CEST)
close #1003


we are very hopeful that X2Go issue #1003 reported by you
has been resolved in the new release ( of the
X2Go source project »src:x2goclient«.

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


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!!!

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

X2Go Component: src:x2goclient
Date: Mon, 19 Sep 2016 06:13:14 +0200
Fixes: 1003 1019 1027 1036 1079
 x2goclient ( RELEASED; urgency=medium
   [ Klaus Ade Johnstad ]
   * New upstream version (
     - res/i18n/x2goclient_nb_no.ts: update BokmÄl (Norway) translation file.
   [ Mihai Moldovan ]
   * New upstream release (
     - res/i18n/x2goclient_nb_no.ts: fixup translation by respecting the
       original messages' format, typo fixes and other changes.
     - res/i18n/x2goclient_fi.ts: fixup translation by respecting the original
       messages' format and other changes.
     - src/{ongetpass,onmainwindow}.cpp: fixup QPlastiqueStyle usage on Qt5.
       This particular style has been removed/replaced by Fusion, which
       incorporates features of both Plastique and Clearlooks styles.
     - x2goclient.spec: whitespace only.
     - src/onmainwindow.cpp: add (default) MacPorts prefix, /usr/local/bin and
       /opt/X11/bin to x2goclient's environment and child environments before
       starting xmodmap. Fixes: #1019. Requires a re-release of X2Go Client for
       OS X.
     - src/x2goutils.{cpp,h}: add new function add_to_path () to add multiple
       entries to a PATH-like string if they do not exist in there yet.
     - src/onmainwindow.cpp: replace old code to modify the PATH value with the
       new add_to_path () function.
     - src/{onmainwindow,sshmasterconnection}.cpp: refactoring and whitespace only
       changes following up the #1027 patch.
     - src/onmainwindow.h: add new enum for selecting SSH host key types.
     - src/onmainwindow.h: rename ONMainWindow::generateHostDsaKey () to
       ONMainWindow::generateHostKey () and make key type selectible. Fixes:
       #1003. Host key type selection currently only works within the code. Replace
       calls to former ONMainWindow::generateHostDsaKey () with the generalized
       function and request an RSA-type key.
     - src/help.cpp: actually make help descriptions translatable. Looks ugly
       and is cumbersome to use, but there seems to be no other way to do
     - src/help.h: typo fix in comment only.
     - src/onmainwindow.cpp: add some comments related to maybe using
       add_to_path ().
     - src/onmainwindow.cpp: work around changed SSH host key locations in OS X
       10.11+. Fixes: #1079. Also check /etc/ssh/ for keys.
     - src/onmainwindow.cpp: fix last commit by using QFileInfo instead of
       QDir. This lets us use the exists () member function correctly.
     - {nsis/x2goclient.nsi,res/i18n/x2goclient_{da,es,et,fi,nl,zh_tw}.ts}:
       replace left-overs of "X2go" with the correct "X2Go" spelling.
       This mostly touches obsolete strings and file names, that need to be
       cleaned, but it's still worthwhile to not have it show up when searching
       for the old string. Given that NTFS is normally case-insensitive,
       removing the files will still work.
   * debian/control:
     - Maintainer change in package: X2Go Developers <x2go-dev@lists.x2go.org>.
     - Uploaders: add myself. Also, force a rebuild due to the changed
   [ Mike DePaulo ]
   * New upstream release (
     - Windows: add sshd debug1 logging when using the --debug flag.
     - Windows: Revert back to Cygwin components that have not been
     - Windows: Update PuTTY from 0.66 to 0.67, which fixes
     - Windows: Update bundled Win32 OpenSSL from 1.0.1q to 1.0.1t,
       which fixes the multiple CVEs announced on 2016-01-28,
       2016-03-01 & 2016-05-03.
   [ Martti PitkÀnen ]
   * New upstream version (
     - res/i18n/x2goclient_fi.ts: update Finnish translation file.
     - res/i18n/x2goclient_fi.ts: update Finnish translation file.
   [ SĂ©bastien Ducoulombier ]
   * New upstream version (
     - misc {src/,x2goclient.pro}: port to Qt5.
   [ Tor Perkins ]
   * New upstream release (
     - src/{onmainwindow,sshmasterconnection}.{cpp,h}: add support for ANSI
       X9.9 OTP tokens. Fixes: #1027. For this to work correctly, the challenge
       string needs to be displayed to the user.
     - src/sshmasterconnection.cpp: add support for Mobile OTP tokens and
       references for the other token types. Fixes: #1036.
   [ Oleksandr Shneyder ]
   * New upstream release (
     - reset session data in broker config.
     - add "--no-autoresume" parameter.
   [ Peter Barth ]
   * New upstream release (
     - res/i18n/x2goclient_de.ts: fix typo in close message.

[Message part 3 (message/rfc822, inline)]
From: Florian Wicke - Hetzner Online GmbH <florian.wicke@hetzner.de>
To: submit@bugs.x2go.org
Subject: x2goclient sshd (for folder sharing) weak host key
Date: Thu, 25 Feb 2016 15:39:15 +0100
[Message part 4 (text/plain, inline)]
Package: x2goclient

The sshd (sshd.exe) spawned by x2goclient for things like the folder
sharing is creating a DSA HostKey.

Even if this sshd is only listening on localhost and is accessed through
the ssh tunnel from the X2Go server this might lead to connections
errors if the ssh_config of the server is configured to not allow
connections to these weak (1024 bit) DSA HostKeys.

I would advice increasing this to at least 2048 bit RSA host keys or
even elliptic curve host keys if available.

Best regards,

 Florian Wicke

Hetzner Online GmbH
Industriestr. 25
91710 Gunzenhausen
Tel: +49 9831 505-187
Fax: +49 9831 505-387

Registergericht Ansbach, HRB 6089
GeschĂ€ftsfĂŒhrer: Martin Hetzner

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