[Bug 1771988] Re: certificate validation with IP address based SAN's fails

[James Page]

Uploaded to xenial proposed for SRU team review.

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https://bugs.launchpad.net/bugs/1771988

Title:
  certificate validation with IP address based SAN's fails

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive mitaka series:
  In Progress
Status in python-urllib3 package in Ubuntu:
  Fix Released
Status in python-urllib3 source package in Xenial:
  In Progress

Bug description:
  [Impact]
  Users of urllib3 are unable to securely access websites who's certificates use IP based subject alternative names;  this includes openstack client tooling which uses urllib3 via requests.

  [Test Case]
  Deploy and configure a server with TLS and an IP based SAN cert with a locally trusted CA.

  import urllib3

  http = urllib3.PoolManager()
  r = http.request('GET', 'https://192.168.1.2')

  will fail

  [Regression Potential]
  Cherry picked fix comes from a later urllib3 release which has tested fine for IP SAN usage in later OpenStack release deployments.

  [Original Bug Report]
  urllib3 fails to validate certificates with IP address based SAN's.

  Fixed upstream:
  https://github.com/urllib3/urllib3/commit/c74bd70c3a97e30f0560bee9b7fa1bfc767ebf0b

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