[Bug 1873565] Re: issue with TLS 1.2 session ticket handling as client during resumption

[Sebastien Bacher]

The issue seems fixed in focal so it's about backporting to older series

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Title:
  issue with TLS 1.2 session ticket handling as client during resumption

Status in Gnutls:
  Fix Released
Status in gnutls28 package in Ubuntu:
  New

Bug description:
  Known upstream bug, that has been fixed upstream. There is an issue
  with session ticket handling in GnuTLS during session resumption.

  The issue is intermittent, but can eventually be reproduced by
  running:

  gnutls-cli --resume api.twitter.com 443

  When you trigger the bug the output will finish with the following two
  lines:

  *** Fatal error: An unexpected TLS packet was received.
  *** handshake has failed: An unexpected TLS packet was received.

  This is breaking the Cawbird Snap package based on Bionic/Core18.

  The issue affects both Bionic and Eoan.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: gnutls-bin 3.6.9-5ubuntu1.1
  ProcVersionSignature: User Name 5.3.0-46.38-generic 5.3.18
  Uname: Linux 5.3.0-46-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.8
  Architecture: amd64
  Date: Sat Apr 18 15:05:04 2020
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnutls28
  UpgradeStatus: No upgrade log present (probably fresh install)

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