107 lines
3.9 KiB
Python
107 lines
3.9 KiB
Python
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# 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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# Based on glance/api/policy.py
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"""Policy Engine For Heat"""
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from oslo.config import cfg
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from heat.common import exception
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import heat.openstack.common.log as logging
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from heat.openstack.common import policy
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logger = logging.getLogger(__name__)
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CONF = cfg.CONF
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DEFAULT_RULES = {
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'default': policy.FalseCheck(),
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}
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class Enforcer(object):
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"""Responsible for loading and enforcing rules."""
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def __init__(self, scope='heat', exc=exception.Forbidden,
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default_rule=DEFAULT_RULES['default']):
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self.scope = scope
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self.exc = exc
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self.default_rule = default_rule
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self.enforcer = policy.Enforcer(default_rule=default_rule)
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def set_rules(self, rules, overwrite=True):
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"""Create a new Rules object based on the provided dict of rules."""
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rules_obj = policy.Rules(rules, self.default_rule)
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self.enforcer.set_rules(rules_obj, overwrite)
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def load_rules(self, force_reload=False):
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"""Set the rules found in the json file on disk."""
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self.enforcer.load_rules(force_reload)
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def _check(self, context, rule, target, exc, *args, **kwargs):
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"""Verifies that the action is valid on the target in this context.
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:param context: Heat request context
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:param rule: String representing the action to be checked
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:param target: Dictionary representing the object of the action.
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:raises: self.exc (defaults to heat.common.exception.Forbidden)
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:returns: A non-False value if access is allowed.
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"""
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do_raise = False if not exc else True
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credentials = {
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'roles': context.roles,
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'user': context.username,
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'tenant': context.tenant,
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}
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return self.enforcer.enforce(rule, target, credentials,
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do_raise, exc=exc, *args, **kwargs)
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def enforce(self, context, action, scope=None, target=None):
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"""Verifies that the action is valid on the target in this context.
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:param context: Heat request context
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:param action: String representing the action to be checked
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:param target: Dictionary representing the object of the action.
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:raises: self.exc (defaults to heat.common.exception.Forbidden)
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:returns: A non-False value if access is allowed.
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"""
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_action = '%s:%s' % (scope or self.scope, action)
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_target = target or {}
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return self._check(context, _action, _target, self.exc, action=action)
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def check(self, context, action, target):
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"""Verifies that the action is valid on the target in this context.
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:param context: Heat request context
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:param action: String representing the action to be checked
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:param target: Dictionary representing the object of the action.
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:returns: A non-False value if access is allowed.
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"""
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return self._check(context, action, target)
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def check_is_admin(self, context):
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"""Whether or not roles contains 'admin' role according to policy.json
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:param context: Heat request context
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:returns: A non-False value if the user is admin according to policy
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"""
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return self._check(context, 'context_is_admin', target={}, exc=None)
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def clear(self):
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self.enforcer.clear()
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