/usr/lib/python2.7/dist-packages/keystone/policy/ is in python-keystone 2:13.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/keystone/policy/__init__.py
/usr/lib/python2.7/dist-packages/keystone/policy/backends/
/usr/lib/python2.7/dist-packages/keystone/policy/backends/__init__.py
/usr/lib/python2.7/dist-packages/keystone/policy/backends/base.py
/usr/lib/python2.7/dist-packages/keystone/policy/backends/rules.py
/usr/lib/python2.7/dist-packages/keystone/policy/backends/sql.py
/usr/lib/python2.7/dist-packages/keystone/policy/controllers.py
/usr/lib/python2.7/dist-packages/keystone/policy/core.py
/usr/lib/python2.7/dist-packages/keystone/policy/routers.py
/usr/lib/python2.7/dist-packages/keystone/policy/schema.py