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[OpenStack Infra <1880959@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/731218
Committed: https://git.openstack.org/cgit/openstack/oslo.policy/commit/?id=75677a31108243e0adddc89f1fbf669053f9573b
Submitter: Zuul
Branch:    master

commit 75677a31108243e0adddc89f1fbf669053f9573b
Author: Dmitrii Shcherbakov <dmitrii.shcherbakov@xxxxxxxxxxxxx>
Date:   Wed May 27 17:06:25 2020 +0300

    Reload files in policy_dirs on primary file change
    
    It was determined that rules from policy files located in the directory
    specified in the policy_dirs option (/etc/<config_dir>/policy.d by
    default) are not re-applied after the rules from the primary policy file
    is re-applied due to a change.
    
    This change introduces additional behavior to make sure the rules from
    policy_dirs are reapplied if there is a change to the primary policy
    file.
    
    Change-Id: I8a6f8e971d881365c41ea409966723319d5b239a
    Closes-Bug: #1880959
    Related-Bug: #1880847


** Changed in: oslo.policy
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1880959

Title:
  Rules from the policy directory files are not reapplied after changes
  to the primary policy file

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive mitaka series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in Ubuntu Cloud Archive rocky series:
  Triaged
Status in Ubuntu Cloud Archive stein series:
  Triaged
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in oslo.policy:
  Fix Released
Status in python-oslo.policy package in Ubuntu:
  Triaged
Status in python-oslo.policy source package in Xenial:
  Triaged
Status in python-oslo.policy source package in Bionic:
  Triaged
Status in python-oslo.policy source package in Eoan:
  Triaged
Status in python-oslo.policy source package in Groovy:
  Triaged

Bug description:
  [Impact]
  Based on the investigation here https://bugs.launchpad.net/charm-keystone/+bug/1880847 it was determined that rules from policy files located in the directory specified in the policy_dirs option (/etc/<config_dir>/policy.d by default) are not re-applied after the rules from the primary policy file is re-applied due to a change.

  This leads to scenarios where incorrect rule combinations are active.

  Example from the test case in 1880847:

  * policy.json gets read with the following rule;
      "identity:list_credentials": "rule:admin_required or user_id:%(user_id)s",
  * rule.yaml from policy.d is read with the following rule;
  {'identity:list_credentials': '!'}
  * policy.json's mtime gets updated (with or without a content change) and overrides the rule to be
      "identity:list_credentials": "rule:admin_required or user_id:%(user_id)s",
  * rule.yaml doesn't get reapplied since it hasn't changed.

  [Test Case]
  For a particular version of oslo.policy:

  * put the attached test (https://bugs.launchpad.net/ubuntu/+source
  /python-
  oslo.policy/+bug/1880959/+attachment/5377753/+files/test_1880959.py)
  under oslo_policy/tests/test_1880959.py;

  * run tox -e cover -- oslo_policy.tests.test_1880959.EnforcerTest;
  * observe the failure;
  # ...
  testtools.matchers._impl.MismatchError: 'role:fakeA' != 'rule:admin'
  Ran 1 tests in 0.005s (+0.001s)
  FAILED (id=1, failures=1)

  * apply the patch;
  * run tox -e cover -- oslo_policy.tests.test_1880959.EnforcerTest
  * observe that the failure is no longer there.

  
  [Regression Potential]
  The regression potential is low given that there is test coverage in the olso.policy unit tests.

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