116 lines
3.9 KiB
Python
116 lines
3.9 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"""
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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 novajoin import config
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from novajoin import exception
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CONF = config.CONF
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policy_opts.set_defaults(CONF, 'policy.json')
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_ENFORCER = None
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# We have only one endpoint, so there is not a lot of default rules
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_RULES = [
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policy.RuleDefault(
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'context_is_admin', 'role:admin',
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"Decides what is required for the 'is_admin:True' check to succeed."),
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policy.RuleDefault(
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'service_project', 'project_name:service',
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"service project"),
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policy.RuleDefault(
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'compute_service_user', 'user_name:nova and rule:service_project',
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"This is usualy the nova service user, which calls the novajoin API, "
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"configured in [vendordata_dynamic_auth] in nova.conf."),
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policy.DocumentedRuleDefault(
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'join:create', 'rule:compute_service_user',
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'Generate the OTP, register it with IPA',
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[{'path': '/', 'method': 'POST'}]
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)
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]
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def list_rules():
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return _RULES
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def get_enforcer():
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global _ENFORCER # pylint: disable=global-statement
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if not _ENFORCER:
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_ENFORCER = policy.Enforcer(CONF)
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_ENFORCER.register_defaults(list_rules())
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return _ENFORCER
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def authorize_action(context, action):
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"""Checks that the action can be done by the given context.
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Applies a check to ensure the context's project_id, user_id and others
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can be applied to the given action using the policy enforcement api.
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"""
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return authorize(context, action, context.to_dict())
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def authorize(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: novajoin 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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:raises PolicyNotAuthorized: if verification fails.
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"""
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return get_enforcer().authorize(action, target, context.to_dict(),
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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 check_is_admin(roles, context=None):
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"""Whether or not user is admin according to policy setting.
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Can use roles or user_id from context to determine if user is admin.
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In a multi-domain configuration, roles alone may not be sufficient.
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"""
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# include project_id on target to avoid KeyError if context_is_admin
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# policy definition is missing, and default admin_or_owner rule
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# attempts to apply. Since our credentials dict does not include a
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# project_id, this target can never match as a generic rule.
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target = {'project_id': ''}
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if context is None:
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credentials = {'roles': roles}
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else:
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credentials = {'roles': context.roles,
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'user_id': context.user_id
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}
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return get_enforcer().authorize('context_is_admin', target, credentials)
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