114 lines
3.7 KiB
Python
114 lines
3.7 KiB
Python
# Copyright (c) 2011 OpenStack, LLC.
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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 Meteos"""
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import functools
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from oslo_config import cfg
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from oslo_policy import policy
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from meteos import exception
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CONF = cfg.CONF
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_ENFORCER = None
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def reset():
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global _ENFORCER
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if _ENFORCER:
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_ENFORCER.clear()
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_ENFORCER = None
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def init(policy_path=None):
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global _ENFORCER
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if not _ENFORCER:
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_ENFORCER = policy.Enforcer(CONF)
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if policy_path:
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_ENFORCER.policy_path = policy_path
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_ENFORCER.load_rules()
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def enforce(context, action, target, do_raise=True):
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"""Verifies that the action is valid on the target in this context.
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:param context: meteos context
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:param action: string representing the action to be checked
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this should be colon separated for clarity.
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i.e. ``compute:create_instance``,
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``compute:attach_volume``,
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``volume:attach_volume``
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:param target: dictionary representing the object of the action
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for object creation this should be a dictionary representing the
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location of the object e.g. ``{'project_id': context.project_id}``
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:param do_raise: Whether to raise an exception if check fils.
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:returns: When ``do_raise`` is ``False``, returns a value that
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evaluates as ``True`` or ``False`` depending on whether
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the policy allows action on the target.
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:raises: meteos.exception.PolicyNotAuthorized if verification fails
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and ``do_raise`` is ``True``.
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"""
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init()
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if not isinstance(context, dict):
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context = context.to_dict()
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# Add the exception arguments if asked to do a raise
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extra = {}
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if do_raise:
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extra.update(exc=exception.PolicyNotAuthorized, action=action,
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do_raise=do_raise)
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return _ENFORCER.enforce(action, target, context, **extra)
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def check_is_admin(roles):
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"""Whether or not roles contains 'admin' role according to policy setting.
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"""
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init()
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# include project_id on target to avoid KeyError if context_is_admin
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# policy definition is missing, and default admin_or_owner rule
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# attempts to apply. Since our credentials dict does not include a
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# project_id, this target can never match as a generic rule.
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target = {'project_id': ''}
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credentials = {'roles': roles}
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return _ENFORCER.enforce("context_is_admin", target, credentials)
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def wrap_check_policy(resource):
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"""Check policy corresponding to the wrapped methods prior to execution."""
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def check_policy_wraper(func):
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@functools.wraps(func)
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def wrapped(self, context, target_obj, *args, **kwargs):
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check_policy(context, resource, func.__name__, target_obj)
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return func(self, context, target_obj, *args, **kwargs)
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return wrapped
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return check_policy_wraper
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def check_policy(context, resource, action, target_obj=None):
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target = {
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'project_id': context.project_id,
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'user_id': context.user_id,
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}
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target.update(target_obj or {})
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_action = '%s:%s' % (resource, action)
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enforce(context, _action, target)
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