/usr/lib/python2.7/dist-packages/cinder/policy.py is in python-cinder 1:2014.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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# 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.gettextutils import _
from cinder.openstack.common import policy
from cinder import utils
policy_opts = [
cfg.StrOpt('policy_file',
default='policy.json',
help=_('JSON file representing policy')),
cfg.StrOpt('policy_default_rule',
default='default',
help=_('Rule checked when requested rule is not found')), ]
CONF = cfg.CONF
CONF.register_opts(policy_opts)
_POLICY_PATH = None
_POLICY_CACHE = {}
def reset():
global _POLICY_PATH
global _POLICY_CACHE
_POLICY_PATH = None
_POLICY_CACHE = {}
policy.reset()
def init():
global _POLICY_PATH
global _POLICY_CACHE
if not _POLICY_PATH:
_POLICY_PATH = utils.find_config(CONF.policy_file)
utils.read_cached_file(_POLICY_PATH, _POLICY_CACHE,
reload_func=_set_brain)
def _set_brain(data):
default_rule = CONF.policy_default_rule
policy.set_brain(policy.Brain.load_json(data, default_rule))
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.
"""
target = {
'project_id': context.project_id,
'user_id': context.user_id,
}
enforce(context, action, target)
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 cinder.exception.PolicyNotAuthorized: if verification fails.
"""
init()
match_list = ('rule:%s' % action,)
credentials = context.to_dict()
policy.enforce(match_list, target, credentials,
exception.PolicyNotAuthorized, action=action)
def check_is_admin(roles):
"""Whether or not roles contains 'admin' role according to policy setting.
"""
init()
action = 'context_is_admin'
match_list = ('rule:%s' % action,)
# 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 policy.enforce(match_list, target, credentials)
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