212 lines
7.3 KiB
Python
212 lines
7.3 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 Cinder"""
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import sys
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_policy import opts as policy_opts
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from oslo_policy import policy
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from oslo_utils import excutils
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from cinder import exception
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from cinder import policies
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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DEFAULT_POLICY_FILENAME = 'policy.yaml'
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policy_opts.set_defaults(cfg.CONF, DEFAULT_POLICY_FILENAME)
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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(use_conf=True):
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"""Init an Enforcer class.
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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 not _ENFORCER:
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_ENFORCER = policy.Enforcer(
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CONF,
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use_conf=use_conf)
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register_rules(_ENFORCER)
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_ENFORCER.load_rules()
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def enforce(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: cinder 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 for object
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creation this should be a dictionary representing the
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location of the object e.g.
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``{'project_id': context.project_id}``
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:raises PolicyNotAuthorized: if verification fails.
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"""
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init()
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return _ENFORCER.enforce(action,
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target,
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context.to_policy_values(),
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do_raise=True,
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exc=exception.PolicyNotAuthorized,
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action=action)
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def set_rules(rules, overwrite=True, use_conf=False):
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"""Set rules based on the provided dict of rules.
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:param rules: New rules to use. It should be an instance of dict.
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:param overwrite: Whether to overwrite current rules or update them
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with the new rules.
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:param use_conf: Whether to reload rules from config file.
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"""
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init(use_conf=False)
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_ENFORCER.set_rules(rules, overwrite, use_conf)
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def get_rules():
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if _ENFORCER:
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return _ENFORCER.rules
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def register_rules(enforcer):
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enforcer.register_defaults(policies.list_rules())
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def get_enforcer():
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# This method is for use by oslopolicy CLI scripts. Those scripts need the
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# 'output-file' and 'namespace' options, but having those in sys.argv means
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# loading the Cinder config options will fail as those are not expected to
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# be present. So we pass in an arg list with those stripped out.
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conf_args = []
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# Start at 1 because cfg.CONF expects the equivalent of sys.argv[1:]
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i = 1
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while i < len(sys.argv):
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if sys.argv[i].strip('-') in ['namespace', 'output-file']:
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i += 2
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continue
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conf_args.append(sys.argv[i])
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i += 1
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cfg.CONF(conf_args, project='cinder')
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init()
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return _ENFORCER
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def authorize(context, action, target, do_raise=True, exc=None):
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"""Verifies that the action is valid on the target in this context.
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:param context: cinder 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 for object
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creation this should be a dictionary representing the
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location of the object e.g.
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``{'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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:param exc: Class of the exception to raise if the check fails.
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Any remaining arguments passed to :meth:`authorize` (both
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positional and keyword arguments) will be passed to
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the exception class. If not specified,
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:class:`PolicyNotAuthorized` will be used.
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:raises cinder.exception.PolicyNotAuthorized: if verification fails
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and do_raise is True. Or if 'exc' is specified it will raise an
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exception of that type.
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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_policy_values()
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if not exc:
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exc = exception.PolicyNotAuthorized
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try:
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result = _ENFORCER.authorize(action, target, credentials,
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do_raise=do_raise, exc=exc, action=action)
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except policy.PolicyNotRegistered:
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with excutils.save_and_reraise_exception():
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LOG.exception('Policy not registered')
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.error('Policy check for %(action)s failed with credentials '
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'%(credentials)s',
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{'action': action, 'credentials': credentials})
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return result
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def check_is_admin(context):
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"""Whether or not user is admin according to policy setting."""
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init()
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# the target is user-self
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credentials = context.to_policy_values()
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target = credentials
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return _ENFORCER.authorize('context_is_admin', target, credentials)
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def verify_deprecated_policy(old_policy, new_policy, default_rule, context):
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"""Check the rule of the deprecated policy action
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If the current rule of the deprecated policy action is set to a non-default
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value, then a warning message is logged stating that the new policy
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action should be used to dictate permissions as the old policy action is
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being deprecated.
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:param old_policy: policy action that is being deprecated
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:param new_policy: policy action that is replacing old_policy
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:param default_rule: the old_policy action default rule value
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:param context: the cinder context
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"""
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if _ENFORCER:
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current_rule = str(_ENFORCER.rules[old_policy])
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else:
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current_rule = None
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if current_rule != default_rule:
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LOG.warning('Start using the new action %(new_policy)s. The existing '
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'action %(old_policy)s is being deprecated and will be '
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'removed in future release.',
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{'new_policy': new_policy, 'old_policy': old_policy})
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context.authorize(old_policy)
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return True
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return False
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