68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
# Copyright (c) 2011 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Policy Engine For Cerberus."""
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from oslo.config import cfg
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from cerberus.openstack.common import policy
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_ENFORCER = None
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CONF = cfg.CONF
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def init_enforcer(policy_file=None, rules=None,
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default_rule=None, use_conf=True):
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"""Synchronously initializes the policy enforcer
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:param policy_file: Custom policy file to use, if none is specified,
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`CONF.policy_file` will be used.
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:param rules: Default dictionary / Rules to use. It will be
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considered just in the first instantiation.
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:param default_rule: Default rule to use, CONF.default_rule will
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be used if none is specified.
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:param use_conf: Whether to load rules from config file.
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"""
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global _ENFORCER
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if _ENFORCER:
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return
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_ENFORCER = policy.Enforcer(policy_file=policy_file,
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rules=rules,
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default_rule=default_rule,
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use_conf=use_conf)
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def get_enforcer():
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"""Provides access to the single instance of Policy enforcer."""
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if not _ENFORCER:
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init_enforcer()
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return _ENFORCER
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def enforce(rule, target, creds, do_raise=False, exc=None, *args, **kwargs):
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"""A shortcut for policy.Enforcer.enforce()
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Checks authorization of a rule against the target and credentials.
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"""
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enforcer = get_enforcer()
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return enforcer.enforce(rule, target, creds, do_raise=do_raise,
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exc=exc, *args, **kwargs)
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