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# Copyright 2016 Tesora Inc.
# 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.
from oslo_config import cfg
from oslo_policy import opts
from oslo_policy import policy
from trove.common import exception as trove_exceptions
from trove.common import policies
CONF = cfg.CONF
_ENFORCER = None
# TODO(gmann): Remove setting the default value of config policy_file
# once oslo_policy change the default value to 'policy.yaml'.
# https://github.com/openstack/oslo.policy/blob/a626ad12fe5a3abd49d70e3e5b95589d279ab578/oslo_policy/opts.py#L49
DEFAULT_POLICY_FILE = 'policy.yaml'
opts.set_defaults(CONF, DEFAULT_POLICY_FILE)
def get_enforcer():
global _ENFORCER
if not _ENFORCER:
_ENFORCER = policy.Enforcer(CONF)
_ENFORCER.register_defaults(policies.list_rules())
_ENFORCER.load_rules()
return _ENFORCER
def authorize_on_tenant(context, rule):
return __authorize(context, rule, target=None)
def authorize_on_target(context, rule, target):
if target:
return __authorize(context, rule, target=target)
raise trove_exceptions.TroveError(
"BUG: Target must not evaluate to False.")
def __authorize(context, rule, target=None):
"""Checks authorization of a rule against the target in this context.
* This function is not to be called directly.
Calling the function with a target that evaluates to None may
result in policy bypass.
Use 'authorize_on_*' calls instead.
:param context Trove context.
:type context Context.
:param rule: The rule to evaluate.
e.g. ``instance:create_instance``,
``instance:resize_volume``
:param target As much information about the object being operated on
as possible.
For object creation (target=None) this should be a
dictionary representing the location of the object
e.g. ``{'project_id': context.project_id}``
:type target dict
:raises: :class:`PolicyNotAuthorized` if verification fails.
"""
target = target or {'tenant': context.project_id}
return get_enforcer().authorize(
rule, target, context.to_dict(), do_raise=True,
exc=trove_exceptions.PolicyNotAuthorized, action=rule)
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