123 lines
3.8 KiB
Python
123 lines
3.8 KiB
Python
# Copyright (c) 2013 Bull.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Policy Engine For Blazar."""
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import functools
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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 blazar import context
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from blazar import exceptions
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from blazar import policies
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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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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_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():
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global _ENFORCER
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if not _ENFORCER:
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LOG.debug("Enforcer not present, recreating at init stage.")
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_ENFORCER = policy.Enforcer(CONF)
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_ENFORCER.register_defaults(policies.list_rules())
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def set_rules(data, default_rule=None):
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default_rule = default_rule or 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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_ENFORCER.set_rules(policy.Rules.load(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: blazar 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 blazar.exceptions.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 exceptions 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=exceptions.PolicyNotAuthorized, action=action)
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return _ENFORCER.enforce(action, target, credentials, do_raise=do_raise,
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**extra)
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def authorize(extension, action=None, api='blazar', ctx=None,
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target=None):
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def decorator(func):
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@functools.wraps(func)
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def wrapped(self, *args, **kwargs):
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cur_ctx = ctx or context.current()
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tgt = target or {'project_id': cur_ctx.project_id,
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'user_id': cur_ctx.user_id}
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if action is None:
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act = '%s:%s' % (api, extension)
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else:
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act = '%s:%s:%s' % (api, extension, action)
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enforce(cur_ctx, act, tgt)
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return func(self, *args, **kwargs)
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return wrapped
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return decorator
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