fenix/fenix/policy.py

111 lines
3.3 KiB
Python

# Copyright (c) 2013 Bull.
#
# 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 Fenix."""
import functools
from oslo_config import cfg
from oslo_log import log as logging
from oslo_policy import opts
from oslo_policy import policy
from fenix import context
from fenix import exceptions
from fenix import policies
CONF = cfg.CONF
opts.set_defaults(CONF)
LOG = logging.getLogger(__name__)
_ENFORCER = None
def reset():
global _ENFORCER
if _ENFORCER:
_ENFORCER.clear()
_ENFORCER = None
def init():
global _ENFORCER
if not _ENFORCER:
_ENFORCER = policy.Enforcer(CONF)
_ENFORCER.register_defaults(policies.list_rules())
def set_rules(data, default_rule=None):
default_rule = default_rule or CONF.policy_default_rule
if not _ENFORCER:
init()
if default_rule:
_ENFORCER.default_rule = default_rule
_ENFORCER.set_rules(policy.Rules.load(data, default_rule))
def enforce(context, action, target, do_raise=True):
"""Verifies that the action is valid on the target in this context.
:param context: fenix context
:param action: string representing the action to be checked
:param target: 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}``
:param do_raise: if True (the default), raises PolicyNotAuthorized;
if False, returns False
:raises fenix.exceptions.PolicyNotAuthorized: if verification fails
and do_raise is True.
:return: returns a non-False value (not necessarily "True") if
authorized, and the exact value False if not authorized and
do_raise is False.
"""
init()
credentials = context.to_dict()
LOG.debug("enforce %s" % credentials)
# Add the exceptions arguments if asked to do a raise
extra = {}
if do_raise:
extra.update(exc=exceptions.PolicyNotAuthorized, action=action)
return _ENFORCER.enforce(action, target, credentials, do_raise=do_raise,
**extra)
def authorize(extension, action=None, api='fenix', ctx=None,
target=None):
def decorator(func):
@functools.wraps(func)
def wrapped(self, *args, **kwargs):
cur_ctx = ctx or context.current()
tgt = target or {'project_id': cur_ctx.project_id,
'user_id': cur_ctx.user_id}
LOG.debug("authorize target: %s" % tgt)
if action is None:
act = '%s:%s' % (api, extension)
else:
act = '%s:%s:%s' % (api, extension, action)
LOG.debug("authorize policy: %s" % act)
enforce(cur_ctx, act, tgt)
return func(self, *args, **kwargs)
return wrapped
return decorator