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# Copyright 2012 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Main entry point into the Policy service."""
import abc
from oslo_config import cfg
import six
from keystone.common import dependency
from keystone.common import manager
from keystone import exception
from keystone import notifications
CONF = cfg.CONF
@dependency.provider('policy_api')
class Manager(manager.Manager):
"""Default pivot point for the Policy backend.
See :mod:`keystone.common.manager.Manager` for more details on how this
dynamically calls the backend.
"""
driver_namespace = 'keystone.policy'
_POLICY = 'policy'
def __init__(self):
super(Manager, self).__init__(CONF.policy.driver)
def create_policy(self, policy_id, policy, initiator=None):
ref = self.driver.create_policy(policy_id, policy)
notifications.Audit.created(self._POLICY, policy_id, initiator)
return ref
def get_policy(self, policy_id):
try:
return self.driver.get_policy(policy_id)
except exception.NotFound:
raise exception.PolicyNotFound(policy_id=policy_id)
def update_policy(self, policy_id, policy, initiator=None):
if 'id' in policy and policy_id != policy['id']:
raise exception.ValidationError('Cannot change policy ID')
try:
ref = self.driver.update_policy(policy_id, policy)
except exception.NotFound:
raise exception.PolicyNotFound(policy_id=policy_id)
notifications.Audit.updated(self._POLICY, policy_id, initiator)
return ref
@manager.response_truncated
def list_policies(self, hints=None):
# NOTE(henry-nash): Since the advantage of filtering or list limiting
# of policies at the driver level is minimal, we leave this to the
# caller.
return self.driver.list_policies()
def delete_policy(self, policy_id, initiator=None):
try:
ret = self.driver.delete_policy(policy_id)
except exception.NotFound:
raise exception.PolicyNotFound(policy_id=policy_id)
notifications.Audit.deleted(self._POLICY, policy_id, initiator)
return ret
@six.add_metaclass(abc.ABCMeta)
class Driver(object):
def _get_list_limit(self):
return CONF.policy.list_limit or CONF.list_limit
@abc.abstractmethod
def enforce(self, context, credentials, action, target):
"""Verify that a user is authorized to perform action.
For more information on a full implementation of this see:
`keystone.policy.backends.rules.Policy.enforce`
"""
raise exception.NotImplemented() # pragma: no cover
@abc.abstractmethod
def create_policy(self, policy_id, policy):
"""Store a policy blob.
:raises: keystone.exception.Conflict
"""
raise exception.NotImplemented() # pragma: no cover
@abc.abstractmethod
def list_policies(self):
"""List all policies."""
raise exception.NotImplemented() # pragma: no cover
@abc.abstractmethod
def get_policy(self, policy_id):
"""Retrieve a specific policy blob.
:raises: keystone.exception.PolicyNotFound
"""
raise exception.NotImplemented() # pragma: no cover
@abc.abstractmethod
def update_policy(self, policy_id, policy):
"""Update a policy blob.
:raises: keystone.exception.PolicyNotFound
"""
raise exception.NotImplemented() # pragma: no cover
@abc.abstractmethod
def delete_policy(self, policy_id):
"""Remove a policy blob.
:raises: keystone.exception.PolicyNotFound
"""
raise exception.NotImplemented() # pragma: no cover
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