120 lines
3.6 KiB
Python
120 lines
3.6 KiB
Python
# Copyright (c) 2011 OpenStack Foundation
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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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"""Policy Engine For Cinder"""
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from oslo.config import cfg
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from cinder import exception
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from cinder.openstack.common.gettextutils import _
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from cinder.openstack.common import policy
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from cinder import utils
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policy_opts = [
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cfg.StrOpt('policy_file',
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default='policy.json',
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help=_('JSON file representing policy')),
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cfg.StrOpt('policy_default_rule',
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default='default',
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help=_('Rule checked when requested rule is not found')), ]
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CONF = cfg.CONF
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CONF.register_opts(policy_opts)
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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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global _POLICY_CACHE
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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(CONF.policy_file)
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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 = CONF.policy_default_rule
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policy.set_brain(policy.Brain.load_json(data, default_rule))
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def enforce_action(context, action):
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"""Checks that the action can be done by the given context.
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Applies a check to ensure the context's project_id and user_id can be
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applied to the given action using the policy enforcement api.
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"""
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target = {
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'project_id': context.project_id,
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'user_id': context.user_id,
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}
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enforce(context, action, target)
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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: cinder 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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i.e. ``compute:create_instance``,
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``compute:attach_volume``,
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``volume:attach_volume``
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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 cinder.exception.PolicyNotAuthorized: 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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exception.PolicyNotAuthorized, action=action)
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def check_is_admin(roles):
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"""Whether or not roles contains 'admin' role according to policy setting.
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"""
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init()
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action = 'context_is_admin'
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match_list = ('rule:%s' % action,)
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# include project_id on target to avoid KeyError if context_is_admin
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# policy definition is missing, and default admin_or_owner rule
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# attempts to apply. Since our credentials dict does not include a
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# project_id, this target can never match as a generic rule.
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target = {'project_id': ''}
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credentials = {'roles': roles}
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return policy.enforce(match_list, target, credentials)
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