Dropbear incompatible with current python Twisted

Matt Johnston matt at ucc.asn.au
Tue Jun 5 22:10:03 AWST 2018


The most likely cause would be that Twisted doesn't handle firstPacketFollows properly, which seems to be the case looking at https://github.com/twisted/twisted/blob/trunk/src/twisted/conch/ssh/transport.py#L869 
Can you add that to the Twisted bug report?

Cheers,
Matt


> On Tue 5/6/2018, at 1:12 am, Michael Ducharme <mducharme at gobcn.ca> wrote:
> 
> I recently upgraded our Zenoss system to 6.1.2 which includes a newer version of Twisted python framework. This new version of Twisted no longer connects to dropbear on our Ubiquiti radios.
> 
> When Twisted tries to connect, the connection is lost while authenticating, and dropbear logs the error:
> 
> Jun  4 10:29:02 dropbear[28183]: Child connection from 206.red.ac.ted:60338
> Jun  4 10:29:04 dropbear[28183]: Exit before auth: Integrity error
> Jun  4 10:29:07 dropbear[28195]: Child connection from 206.red.ac.ted:60342
> Jun  4 10:29:09 dropbear[28195]: Exit before auth: Integrity error
> 
> I've been able to reproduce this issue with the latest release of twisted, 18.4.0, which I installed on another server by itself. This issue did not happen on the 2 or 3 year old version of Zenoss we were upgrading from, which presumably used an older version of Twisted.
> 
> I submitted a bug report with twisted (https://twistedmatrix.com/trac/ticket/9464 <https://twistedmatrix.com/trac/ticket/9464>) but thought I would ask here on the off chance that it is due to a dropbear bug.

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