126 lines
4.2 KiB
Python
126 lines
4.2 KiB
Python
# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
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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 designate/policy.py
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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
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from oslo_policy import policy
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from webob import exc as exceptions
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from murano.common import policies
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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_ENFORCER = None
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# TODO(gmann): Remove setting the default value of config policy_file
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# once oslo_policy change the default value to 'policy.yaml'.
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# https://github.com/openstack/oslo.policy/blob/a626ad12fe5a3abd49d70e3e5b95589d279ab578/oslo_policy/opts.py#L49
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DEFAULT_POLICY_FILE = 'policy.yaml'
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opts.set_defaults(CONF, DEFAULT_POLICY_FILE)
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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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global _ENFORCER
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if not _ENFORCER:
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LOG.debug("Enforcer is not present, recreating.")
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_ENFORCER = policy.Enforcer(CONF, use_conf=use_conf)
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register_rules(_ENFORCER)
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def set_rules(data, default_rule=None, overwrite=True):
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default_rule = default_rule or cfg.CONF.policy_default_rule
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if not _ENFORCER:
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LOG.debug("Enforcer not present, recreating at rules stage.")
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init()
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if default_rule:
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_ENFORCER.default_rule = default_rule
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LOG.debug("Loading rules {rules}, default: {def_rule}, overwrite: "
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"{overwrite}".format(rules=data, def_rule=default_rule,
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overwrite=overwrite))
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if isinstance(data, dict):
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rules = policy.Rules.from_dict(data, default_rule)
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else:
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rules = policy.Rules.load_json(data, default_rule)
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_ENFORCER.set_rules(rules, overwrite=overwrite)
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def check(rule, ctxt, target=None, do_raise=True, exc=None):
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"""Verify that the rule is valid on the target in this context.
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:param rule: String representing the action to be checked, which should
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be colon-separated for clarity.
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:param ctxt: Request context from which user credentials are extracted.
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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. {'environment_id':
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object.environment_id}
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:param do_raise: Whether to raise an exception or not if the check fails.
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:param exc: Class of the exception to raise if the check fails.
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:raises exceptions.HTTPForbidden: If verification fails. Or if 'exc' is
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specified it will raise an exception of
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that type.
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"""
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init()
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if target is None:
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target = {}
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creds = ctxt.to_dict()
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if not exc:
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exc = exceptions.HTTPForbidden
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try:
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result = _ENFORCER.enforce(rule, target, creds, do_raise, exc)
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except Exception:
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result = False
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raise
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else:
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return result
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finally:
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if result:
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LOG.debug("Policy check succeeded for rule {rule} on target "
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"{target}".format(rule=rule, target=repr(target)))
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else:
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LOG.debug("Policy check failed for rule {rule} on target: "
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"{target}".format(rule=rule, target=repr(target)))
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def check_is_admin(context):
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"""Check if the given context is associated with an admin role.
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:param context: Murano request context
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:returns: A non-False value if context role is admin.
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"""
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return check('context_is_admin', context, context.to_dict(),
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do_raise=False)
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def register_rules(enforcer):
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enforcer.register_defaults(policies.list_rules())
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