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# Copyright 2012 Managed I.T.
#
# Author: Kiall Mac Innes <kiall@managedit.ie>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from oslo_config import cfg
from oslo_log import log as logging
from oslo_policy import opts
from oslo_policy import policy
from designate.common import policies
from designate import exceptions
CONF = cfg.CONF
# Add the default policy opts
# TODO(gmann): Remove setting the default value of config policy_file
# once oslo_policy change the default value to 'policy.yaml'.
# https://github.com/openstack/oslo.policy/blob/a626ad12fe5a3abd49d70e3e5b95589d279ab578/oslo_policy/opts.py#L49
DEFAULT_POLICY_FILE = 'policy.yaml'
opts.set_defaults(CONF, DEFAULT_POLICY_FILE)
LOG = logging.getLogger(__name__)
_ENFORCER = None
def reset():
global _ENFORCER
if _ENFORCER:
_ENFORCER.clear()
_ENFORCER = None
def set_rules(data, default_rule=None, overwrite=True):
default_rule = default_rule or cfg.CONF.policy_default_rule
if not _ENFORCER:
LOG.debug("Enforcer not present, recreating at rules stage.")
init()
if default_rule:
_ENFORCER.default_rule = default_rule
msg = "Loading rules %s, default: %s, overwrite: %s"
LOG.debug(msg, data, default_rule, overwrite)
if isinstance(data, dict):
rules = policy.Rules.from_dict(data, default_rule)
else:
rules = policy.Rules.load_json(data, default_rule)
_ENFORCER.set_rules(rules, overwrite=overwrite)
def init(default_rule=None, policy_file=None):
global _ENFORCER
if not _ENFORCER:
LOG.debug("Enforcer is not present, recreating.")
_ENFORCER = policy.Enforcer(CONF, policy_file=policy_file)
_ENFORCER.register_defaults(policies.list_rules())
def check(rule, ctxt, target=None, do_raise=True, exc=exceptions.Forbidden):
if enforce_new_defaults():
creds = ctxt.to_policy_values()
else:
creds = ctxt.to_dict()
target = target or {}
try:
result = _ENFORCER.enforce(rule, target, creds, do_raise, exc)
except policy.InvalidScope:
result = False
if do_raise:
raise exceptions.InvalidTokenScope
except Exception:
result = False
raise
else:
return result
finally:
extra = {'policy': {'rule': rule, 'target': target}}
if result:
LOG.trace("Policy check succeeded for rule '%(rule)s' "
"on target %(target)s",
{'rule': rule, 'target': repr(target)}, extra=extra)
else:
LOG.info("Policy check failed for rule '%(rule)s' "
"on target %(target)s",
{'rule': rule, 'target': repr(target)}, extra=extra)
def enforce_new_defaults():
if CONF.get('oslo_policy'):
return CONF['oslo_policy'].get('enforce_new_defaults', False)
return False
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