Ubuntu
openssh package

OpenSSH Client Certificate Auth Regression

Bug #1575961 reported by Paul Querna on 2016-04-27

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	openssh (Ubuntu)	Fix Released	High	Colin Watson
	Xenial	Fix Released	High	Colin Watson

Bug Description

OpenSSH Client Certificates worked in Ubuntu 15.10 and 14.04 LTS -- but not 16.04.

OpenSSH 7.2.p2 includes a bug in how it loads keys & certificates, and basically will never find the correct private key for an OpenSSH Client Certificate.

This is the upstream bug:

https://bugzilla.mindrot.org/show_bug.cgi?id=2550

Fix was committed on March 14:

https://github.com/openssh/openssh-portable/commit/c38905ba391434834da86abfc988a2b8b9b62477

I've tested with the attached patch, and it allows Client Certificate auth to work at all.

Tags:

Revision history for this message

Paul Querna (pquerna) wrote on 2016-04-27:

unbreak-certificate-auth.dpatch Edit (2.6 KiB, text/plain)

Revision history for this message

Ubuntu Foundations Team Bug Bot (crichton) wrote on 2016-04-28:

The attachment "unbreak-certificate-auth.dpatch" seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]

tags:

added: patch

Colin Watson (cjwatson) on 2016-04-28

Changed in openssh (Ubuntu):
status:	New → Triaged
importance:	Undecided → High
assignee:	nobody → Colin Watson (cjwatson)
no longer affects:	openssh (Ubuntu Trusty)
Changed in openssh (Ubuntu Xenial):
status:	New → Triaged
importance:	Undecided → High

Colin Watson (cjwatson) on 2016-04-28

Changed in openssh (Ubuntu):
status:	Triaged → Fix Committed

Colin Watson (cjwatson) on 2016-04-28

Changed in openssh (Ubuntu Xenial):
status:	Triaged → In Progress
assignee:	nobody → Colin Watson (cjwatson)

Revision history for this message

Martin Pitt (pitti) wrote on 2016-04-28: Please test proposed package

Hello Paul, or anyone else affected,

Accepted openssh into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/openssh/1:7.2p2-4ubuntu1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Changed in openssh (Ubuntu Xenial):
status:	In Progress → Fix Committed
tags:	added: verification-needed

Revision history for this message

Paul Querna (pquerna) wrote on 2016-04-28:

Thanks for the quick response, with openssh-client_7.2p2-4ubuntu1_amd64.deb installed I am able to use SSH Client Certificates again!

Colin Watson (cjwatson) on 2016-04-28

tags:

added: verification-done
removed: verification-needed

Revision history for this message

Launchpad Janitor (janitor) wrote on 2016-04-29:

This bug was fixed in the package openssh - 1:7.2p2-5

---------------
openssh (1:7.2p2-5) unstable; urgency=medium

  * Backport upstream patch to unbreak authentication using lone certificate
    keys in ssh-agent: when attempting pubkey auth with a certificate, if no
    separate private key is found among the keys then try with the
    certificate key itself (thanks, Paul Querna; LP: #1575961).

-- Colin Watson <email address hidden> Thu, 28 Apr 2016 01:52:01 +0100

Changed in openssh (Ubuntu):
status:	Fix Committed → Fix Released

Revision history for this message

Launchpad Janitor (janitor) wrote on 2016-05-09:

This bug was fixed in the package openssh - 1:7.2p2-4ubuntu1

---------------
openssh (1:7.2p2-4ubuntu1) xenial; urgency=medium

-- Colin Watson <email address hidden> Thu, 28 Apr 2016 01:57:51 +0100

Changed in openssh (Ubuntu Xenial):
status:	Fix Committed → Fix Released

Revision history for this message

Martin Pitt (pitti) wrote on 2016-05-09: Update Released

The verification of the Stable Release Update for openssh has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.