210 lines
7.3 KiB
Python
210 lines
7.3 KiB
Python
# 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 Manila"""
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import functools
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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 policy
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from oslo_utils import excutils
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from manila import exception
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from manila import policies
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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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(rules=None, use_conf=True):
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"""Init an Enforcer class.
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:param policy_file: Custom policy file to use, if none is specified,
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`CONF.policy_file` will be used.
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:param rules: Default dictionary / Rules to use. It will be
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considered just in the first instantiation.
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:param default_rule: Default rule to use, CONF.default_rule will
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be used if none is specified.
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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(CONF,
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rules=rules,
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use_conf=use_conf)
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register_rules(_ENFORCER)
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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: manila 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. ``share:create``,
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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: Whether to raise an exception if check fails.
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:returns: When ``do_raise`` is ``False``, returns a value that
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evaluates as ``True`` or ``False`` depending on whether
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the policy allows action on the target.
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:raises: manila.exception.PolicyNotAuthorized if verification fails
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and ``do_raise`` is ``True``.
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"""
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init()
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if not isinstance(context, dict):
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context = 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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do_raise=do_raise)
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return _ENFORCER.enforce(action, target, context, **extra)
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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 Manila 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='manila')
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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: manila 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. ``share:create``,
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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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: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 manila.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.debug('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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"""
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init()
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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 wrap_check_policy(resource):
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"""Check policy corresponding to the wrapped methods prior to execution."""
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def check_policy_wraper(func):
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@functools.wraps(func)
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def wrapped(self, context, target_obj, *args, **kwargs):
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check_policy(context, resource, func.__name__, target_obj)
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return func(self, context, target_obj, *args, **kwargs)
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return wrapped
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return check_policy_wraper
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def check_policy(context, resource, action, target_obj=None, do_raise=True):
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target = {
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'project_id': context.project_id,
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'user_id': context.user_id,
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}
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target.update(target_obj or {})
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_action = '%s:%s' % (resource, action)
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return authorize(context, _action, target, do_raise=do_raise)
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