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[Dave McCowan <dmccowan@xxxxxxxxx>]

** Also affects: castellan
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1523646

Title:
  Nova/Cinder Key Manager for Barbican Uses Stale Cache

Status in castellan:
  New
Status in Cinder:
  In Progress
Status in OpenStack Compute (nova):
  In Progress

Bug description:
  The Key Manger for Barbican, implemented in Nova and Cinder, caches a value of barbican_client to save extra
  calls to Keystone for authentication.  However, the cached value of barbican_client is only valid for the current
  context.  A check needs to be made to ensure the context has not changed before using the saved value.

  The symptoms for using a stale cache value include getting the following error message when creating
  an encrypted volume.

  From CLI:
  ---------------
  openstack volume create --size 1 --type LUKS encrypted_volume
  The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-aea6be92-020e-41ed-ba88-44a1f5235ab0)

  
  In cinder.log
  -------------------
  2015-12-03 09:09:03.648 TRACE cinder.volume.api Traceback (most recent call last):
  2015-12-03 09:09:03.648 TRACE cinder.volume.api   File "/usr/lib/python2.7/site-packages/taskflow/engines/action_engine/executor.py", line 82, in _exe
  cute_task
  2015-12-03 09:09:03.648 TRACE cinder.volume.api     result = task.execute(**arguments)
  2015-12-03 09:09:03.648 TRACE cinder.volume.api   File "/opt/stack/cinder/cinder/volume/flows/api/create_volume.py", line 409, in execute
  2015-12-03 09:09:03.648 TRACE cinder.volume.api     source_volume)
  2015-12-03 09:09:03.648 TRACE cinder.volume.api   File "/opt/stack/cinder/cinder/volume/flows/api/create_volume.py", line 338, in _get_encryption_key_
  id
  2015-12-03 09:09:03.648 TRACE cinder.volume.api     encryption_key_id = key_manager.create_key(context)
  2015-12-03 09:09:03.648 TRACE cinder.volume.api   File "/opt/stack/cinder/cinder/keymgr/barbican.py", line 147, in create_key
  2015-12-03 09:09:03.648 TRACE cinder.volume.api     LOG.exception(_LE("Error creating key."))
  ….
  2015-12-03 09:09:03.648 TRACE cinder.volume.api   File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 502, in post
  2015-12-03 09:09:03.648 TRACE cinder.volume.api     return self.request(url, 'POST', **kwargs)
  2015-12-03 09:09:03.648 TRACE cinder.volume.api   File "/usr/lib/python2.7/site-packages/keystoneclient/utils.py", line 337, in inner
  2015-12-03 09:09:03.648 TRACE cinder.volume.api     return func(*args, **kwargs)
  2015-12-03 09:09:03.648 TRACE cinder.volume.api   File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 402, in request
  2015-12-03 09:09:03.648 TRACE cinder.volume.api     raise exceptions.from_response(resp, method, url)
  2015-12-03 09:09:03.648 TRACE cinder.volume.api Unauthorized: The request you have made requires authentication. (Disable debug mode to suppress these details.) (HTTP 401) (Request-ID: req-d2c52e0b-c16d-43ec-a7a0-7611113f1270)

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