#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: [X2Go-Dev] Bug#602: X2GoSession clobbers .ssh/known_hosts when add_to_known_hosts is set
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From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Matteo Panella <m.panella@level28.org>, 602@bugs.x2go.org
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Hi Matteo, On Mi 10 Sep 2014 09:45:18 CEST, Matteo Panella wrote: > 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) This does not happen with python-paramiko 1.15.1 anymore. I will add a versioned dependency for that paramiko version to our upstream release python-x2go and then see how to fix our archives. Thanks for notifying us! 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

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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