[Bug 1207123] Re: Key usage violation in certificate has been detected

[Launchpad Bug Tracker]

This bug was fixed in the package gnutls26 - 2.12.14-5ubuntu4.4

---------------
gnutls26 (2.12.14-5ubuntu4.4) quantal-proposed; urgency=low

  * debian/patches/21_ignore_key_usage_violation.patch:
    Prints debug message on key usage violation rather than treating
    the violation as fatal. (LP: #1207123)
 -- Adam Stokes <adam.stokes at ubuntu.com>   Mon, 05 Aug 2013 11:15:19 -0400

** Changed in: gnutls26 (Ubuntu Quantal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1207123

Title:
  Key usage violation in certificate has been detected

Status in “gnutls26” package in Ubuntu:
  Fix Released
Status in “gnutls26” source package in Precise:
  Fix Released
Status in “gnutls26” source package in Quantal:
  Fix Released

Bug description:
  [Impact]
  A certificate issued to allow _only_ a certain ciphersuite (e.g. RSA) gnutls will fail with a key usage violation unless the server explicitly disables all other ciphersuites.

  [Test Case]
  + On a 12.04 system install a valid certificate supporting only RSA
  + Configure an ssl enabled website via apache2 using the above certificate
  + Run gnutls-cli <hostname>

  [Regression Potential]
  The fix for this was pulled from 13.04 and so far no major bugs have been filed relating to this specific issue.

  [Additional]
  As stated above the attached debdiff(s) for quantal and precise were pulled from 13.04 where the code just ignores this violation and moves on. I don't know of a better way to handle this and perhaps someone with more knowledge around gnutls could provide more insight.

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