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# Copyright (c) 2011 OpenStack Foundation
# Copyright 2013 IBM Corp.
# 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 Escalator"""
from oslo.config import cfg
from oslo.log import log as logging
from oslo.policy import policy
from escalator.common import exception
from escalator import i18n
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
DEFAULT_RULES = policy.Rules.from_dict({
'context_is_admin': 'role:admin',
'default': '@',
'manage_image_cache': 'role:admin',
})
_ = i18n._
_LI = i18n._LI
_LW = i18n._LW
class Enforcer(policy.Enforcer):
"""Responsible for loading and enforcing rules"""
def __init__(self):
if CONF.find_file(CONF.oslo_policy.policy_file):
kwargs = dict(rules=None, use_conf=True)
else:
kwargs = dict(rules=DEFAULT_RULES, use_conf=False)
super(Enforcer, self).__init__(CONF, overwrite=False, **kwargs)
def add_rules(self, rules):
"""Add new rules to the Rules object"""
self.set_rules(rules, overwrite=False, use_conf=self.use_conf)
def enforce(self, context, action, target):
"""Verifies that the action is valid on the target in this context.
:param context: Escalator request context
:param action: String representing the action to be checked
:param target: Dictionary representing the object of the action.
:raises: `escalator.common.exception.Forbidden`
:returns: A non-False value if access is allowed.
"""
credentials = {
'roles': context.roles,
'user': context.user,
'tenant': context.tenant,
}
return super(Enforcer, self).enforce(action, target, credentials,
do_raise=True,
exc=exception.Forbidden,
action=action)
def check(self, context, action, target):
"""Verifies that the action is valid on the target in this context.
:param context: Escalator request context
:param action: String representing the action to be checked
:param target: Dictionary representing the object of the action.
:returns: A non-False value if access is allowed.
"""
credentials = {
'roles': context.roles,
'user': context.user,
'tenant': context.tenant,
}
return super(Enforcer, self).enforce(action, target, credentials)
def check_is_admin(self, context):
"""Check if the given context is associated with an admin role,
as defined via the 'context_is_admin' RBAC rule.
:param context: Escalator request context
:returns: A non-False value if context role is admin.
"""
return self.check(context, 'context_is_admin', context.to_dict())
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