133 lines
3.9 KiB
Python
133 lines
3.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# 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 Nova"""
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import os.path
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from nova import config
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from nova import exception
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from nova import flags
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from nova.openstack.common import cfg
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from nova.openstack.common import policy
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from nova import utils
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policy_opts = [
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cfg.StrOpt('policy_file',
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default='policy.json',
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help=_('JSON file representing policy')),
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cfg.StrOpt('policy_default_rule',
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default='default',
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help=_('Rule checked when requested rule is not found')),
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]
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CONF = config.CONF
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CONF.register_opts(policy_opts)
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_POLICY_PATH = None
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_POLICY_CACHE = {}
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def reset():
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global _POLICY_PATH
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global _POLICY_CACHE
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_POLICY_PATH = None
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_POLICY_CACHE = {}
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policy.reset()
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def init():
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global _POLICY_PATH
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global _POLICY_CACHE
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if not _POLICY_PATH:
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_POLICY_PATH = CONF.policy_file
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if not os.path.exists(_POLICY_PATH):
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_POLICY_PATH = CONF.find_file(_POLICY_PATH)
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if not _POLICY_PATH:
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raise exception.ConfigNotFound(path=CONF.policy_file)
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utils.read_cached_file(_POLICY_PATH, _POLICY_CACHE,
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reload_func=_set_rules)
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def _set_rules(data):
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default_rule = CONF.policy_default_rule
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policy.set_rules(policy.Rules.load_json(data, default_rule))
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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: nova 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: if True (the default), raises PolicyNotAuthorized;
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if False, returns False
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:raises nova.exception.PolicyNotAuthorized: if verification fails
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and do_raise is True.
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:return: returns a non-False value (not necessarily "True") if
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authorized, and the exact value False if not authorized and
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do_raise is False.
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"""
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init()
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credentials = 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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return policy.check(action, target, credentials, **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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target = {}
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credentials = {'roles': roles}
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return policy.check('context_is_admin', target, credentials)
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@policy.register('is_admin')
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class IsAdminCheck(policy.Check):
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"""An explicit check for is_admin."""
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def __init__(self, kind, match):
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"""Initialize the check."""
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self.expected = (match.lower() == 'true')
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super(IsAdminCheck, self).__init__(kind, str(self.expected))
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def __call__(self, target, creds):
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"""Determine whether is_admin matches the requested value."""
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return creds['is_admin'] == self.expected
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