03079191cd
The original policy framework allowed new policy checks to be created through inheritance. This is somewhat clunky and unnecessary in Python. This change refactors policy.py to allow new policy checks to be registered using an @register() decorator. One consequence is that HttpBrain is deprecated. Care has been taken to ensure backwards compatibility; deprecation warnings will be emitted for uses of HttpBrain or the inheritance- based checks. (Pull-up from openstack-common, with deprecation of HttpBrain.) Change-Id: I0aa78d1128e55aa7d59558c62128105c01da8f1b
97 lines
3.1 KiB
Python
97 lines
3.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 OpenStack, LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Policy engine for quantum. Largely copied from nova.
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"""
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import os.path
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from quantum.common import exceptions
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from quantum.openstack.common import cfg
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import quantum.common.utils as utils
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from quantum.openstack.common import policy
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_POLICY_PATH = None
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_POLICY_CACHE = {}
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def reset():
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global _POLICY_PATH
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_POLICY_PATH = None
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_POLICY_CACHE = {}
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policy.reset()
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def init():
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global _POLICY_PATH
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global _POLICY_CACHE
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if not _POLICY_PATH:
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_POLICY_PATH = utils.find_config_file({}, cfg.CONF.policy_file)
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if not _POLICY_PATH:
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raise exceptions.PolicyNotFound(path=cfg.CONF.policy_file)
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# pass _set_brain to read_cached_file so that the policy brain
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# is reset only if the file has changed
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utils.read_cached_file(_POLICY_PATH, _POLICY_CACHE,
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reload_func=_set_brain)
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def _set_brain(data):
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default_rule = 'default'
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policy.set_brain(policy.Brain.load_json(data, default_rule))
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def check(context, action, target):
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"""Verifies that the action is valid on the target in this context.
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:param context: quantum context
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:param action: string representing the action to be checked
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this should be colon separated for clarity.
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:param object: dictionary representing the object of the action
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for object creation this should be a dictionary representing the
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location of the object e.g. ``{'project_id': context.project_id}``
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:return: Returns True if access is permitted else False.
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"""
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init()
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match_list = ('rule:%s' % action,)
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credentials = context.to_dict()
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return policy.enforce(match_list, target, credentials)
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def enforce(context, action, target):
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"""Verifies that the action is valid on the target in this context.
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:param context: quantum context
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:param action: string representing the action to be checked
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this should be colon separated for clarity.
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:param object: dictionary representing the object of the action
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for object creation this should be a dictionary representing the
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location of the object e.g. ``{'project_id': context.project_id}``
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:raises quantum.exceptions.PolicyNotAllowed: if verification fails.
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"""
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init()
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match_list = ('rule:%s' % action,)
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credentials = context.to_dict()
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policy.enforce(match_list, target, credentials,
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exceptions.PolicyNotAuthorized, action=action)
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