/usr/share/pyshared/glance/api/policy.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright (c) 2011 OpenStack, LLC.
# 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 Glance"""
import json
import os.path
from glance.common import cfg
from glance.common import exception
from glance.common import policy
class Enforcer(object):
"""Responsible for loading and enforcing rules"""
policy_opts = (
cfg.StrOpt('policy_file', default=None),
cfg.StrOpt('policy_default_rule', default='default'),
)
def __init__(self, conf):
for opt in self.policy_opts:
conf.register_opt(opt)
self.default_rule = conf.policy_default_rule
self.policy_path = self._find_policy_file(conf)
self.policy_file_mtime = None
self.policy_file_contents = None
def set_rules(self, rules):
"""Create a new Brain based on the provided dict of rules"""
brain = policy.Brain(rules, self.default_rule)
policy.set_brain(brain)
def load_rules(self):
"""Set the rules found in the json file on disk"""
rules = self._read_policy_file()
self.set_rules(rules)
@staticmethod
def _find_policy_file(conf):
"""Locate the policy json data file"""
if conf.policy_file:
return conf.policy_file
matches = cfg.find_config_files('glance', 'policy', 'json')
try:
return matches[0]
except IndexError:
raise cfg.ConfigFilesNotFoundError(('policy.json',))
def _read_policy_file(self):
"""Read contents of the policy file
This re-caches policy data if the file has been changed.
"""
mtime = os.path.getmtime(self.policy_path)
if not self.policy_file_contents or mtime != self.policy_file_mtime:
with open(self.policy_path) as fap:
raw_contents = fap.read()
self.policy_file_contents = json.loads(raw_contents)
self.policy_file_mtime = mtime
return self.policy_file_contents
def enforce(self, context, action, target):
"""Verifies that the action is valid on the target in this context.
:param context: Glance request context
:param action: String representing the action to be checked
:param object: Dictionary representing the object of the action.
:raises: `glance.common.exception.Forbidden`
:returns: None
"""
self.load_rules()
match_list = ('rule:%s' % action,)
credentials = {
'roles': context.roles,
'user': context.user,
'tenant': context.tenant,
}
try:
policy.enforce(match_list, target, credentials)
except policy.NotAuthorized:
raise exception.Forbidden(action=action)
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