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policy.py
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policy.py
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# Copyright (c) 2011 OpenStack Foundation
# All Rights Reserved.
#
# 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.
"""Policy Engine For Cinder"""
from oslo_config import cfg
from cinder import exception
from cinder.openstack.common import policy
CONF = cfg.CONF
_ENFORCER = None
def init():
global _ENFORCER
if not _ENFORCER:
_ENFORCER = policy.Enforcer()
def enforce_action(context, action):
"""Checks that the action can be done by the given context.
Applies a check to ensure the context's project_id and user_id can be
applied to the given action using the policy enforcement api.
"""
return enforce(context, action, {'project_id': context.project_id,
'user_id': context.user_id})
def enforce(context, action, target):
"""Verifies that the action is valid on the target in this context.
:param context: cinder context
:param action: string representing the action to be checked
this should be colon separated for clarity.
i.e. ``compute:create_instance``,
``compute:attach_volume``,
``volume:attach_volume``
:param object: dictionary representing the object of the action
for object creation this should be a dictionary representing the
location of the object e.g. ``{'project_id': context.project_id}``
:raises PolicyNotAuthorized: if verification fails.
"""
init()
return _ENFORCER.enforce(action, target, context.to_dict(),
do_raise=True,
exc=exception.PolicyNotAuthorized,
action=action)
def check_is_admin(roles):
"""Whether or not roles contains 'admin' role according to policy setting.
"""
init()
# include project_id on target to avoid KeyError if context_is_admin
# policy definition is missing, and default admin_or_owner rule
# attempts to apply. Since our credentials dict does not include a
# project_id, this target can never match as a generic rule.
target = {'project_id': ''}
credentials = {'roles': roles}
return _ENFORCER.enforce('context_is_admin', target, credentials)