#602 - X2GoSession clobbers .ssh/known_hosts when add_to_known_hosts is set

X2Go Bug report logs - #602
X2GoSession clobbers .ssh/known_hosts when add_to_known_hosts is set

Reported by: Matteo Panella <m.panella@level28.org>

Date: Wed, 10 Sep 2014 07:55:01 UTC

Severity: normal

Tags: pending

Found in version 0.4.0.9

Fixed in version 0.5.0.0

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

Bug is archived. No further changes may be made.

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Subject: Bug#602: X2GoSession clobbers .ssh/known_hosts when add_to_known_hosts is set
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Date: Wed, 10 Sep 2014 09:45:18 +0200
From: Matteo Panella <m.panella@level28.org>
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Package: python-x2go Version: 0.4.0.9 Whenever a host key is registered using pyhoca-cli or pyhoca-gui, the $HOME/.ssh/known_hosts file gets clobbered: all keys whose type is not either ssh-dss or ssh-rsa (namely, ECDSA and Ed25519 host keys) are removed. Steps to reproduce: 1. register some ECDSA/Ed25519 host keys 2. backup .ssh/known_hosts 3. define a new profile in pyhoca-gui selecting "Store SSH host keys under (unique) X2Go session profile ID" 4. connect to the host and accept the host key 5. run a diff between the old known_hosts file and the current .ssh/known_hosts file Expected behaviour: there should _only_ be an addition for the new ssh host key registered by python-x2go and no other modification Actual result: there is an addition for the new host key registered by python-x2go and removals for all ecdsa and ed25519 host keys I suspect this is a problem with paramiko not understanding ECDSA and Ed25519 keys in known_hosts and summarily discarding them, nevertheless I'm raising the bug here because the x2go PPA for Ubuntu ships a custom version of paramiko for precise (also because it should probably be noted in the release notes and/or worked around in python-x2go if possible). Client OS Version: Ubuntu 12.04.5 (amd64) Package source: ppa:x2go/stable PyHoca-GUI Version: 0.4.0.9 (0.4.0.9-0~1107~ubuntu12.04.1) python-x2go Version: 0.4.0.9 (0.4.0.9-0~1122~ubuntu12.04.1) python-paramiko Version: 1.11.0-0~664~precise1 (from ppa:x2go/stable) The server bits are mostly irrelevant since this is purely a client-side bug, but it happened with the following server-side configuration: Server OS Version: Ubuntu 14.04.1 (amd64) Package source: ppa:x2go/stable Server x2goserver Version: 4.0.1.15 (4.0.1.15-0~847~ubuntu14.04.1) Server x2goserver-xsession Version: 4.0.1.15 (4.0.1.15-0~847~ubuntu14.04.1) Server nx-libs Version: 3.5.0.27 (2:3.5.0.27-0~446~ubuntu14.04.1) -- Matteo Panella

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X2Go Bug report logs - #602 X2GoSession clobbers .ssh/known_hosts when add_to_known_hosts is set

X2Go Bug report logs - #602
X2GoSession clobbers .ssh/known_hosts when add_to_known_hosts is set