264 lines
11 KiB
Python
264 lines
11 KiB
Python
# Copyright 2014 IBM Corp.
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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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from oslo_log import log
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from keystone.common import manager
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from keystone.common import provider_api
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import keystone.conf
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from keystone import exception
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from keystone.i18n import _
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CONF = keystone.conf.CONF
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LOG = log.getLogger(__name__)
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PROVIDERS = provider_api.ProviderAPIs
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class Manager(manager.Manager):
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"""Default pivot point for the Endpoint Policy backend.
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See :mod:`keystone.common.manager.Manager` for more details on how this
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dynamically calls the backend.
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"""
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driver_namespace = 'keystone.endpoint_policy'
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_provides_api = 'endpoint_policy_api'
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def __init__(self):
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super(Manager, self).__init__(CONF.endpoint_policy.driver)
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def _assert_valid_association(self, endpoint_id, service_id, region_id):
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"""Assert that the association is supported.
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There are three types of association supported:
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- Endpoint (in which case service and region must be None)
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- Service and region (in which endpoint must be None)
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- Service (in which case endpoint and region must be None)
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"""
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if (endpoint_id is not None and
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service_id is None and region_id is None):
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return
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if (service_id is not None and region_id is not None and
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endpoint_id is None):
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return
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if (service_id is not None and
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endpoint_id is None and region_id is None):
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return
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raise exception.InvalidPolicyAssociation(endpoint_id=endpoint_id,
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service_id=service_id,
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region_id=region_id)
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def create_policy_association(self, policy_id, endpoint_id=None,
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service_id=None, region_id=None):
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self._assert_valid_association(endpoint_id, service_id, region_id)
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self.driver.create_policy_association(policy_id, endpoint_id,
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service_id, region_id)
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def check_policy_association(self, policy_id, endpoint_id=None,
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service_id=None, region_id=None):
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self._assert_valid_association(endpoint_id, service_id, region_id)
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self.driver.check_policy_association(policy_id, endpoint_id,
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service_id, region_id)
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def delete_policy_association(self, policy_id, endpoint_id=None,
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service_id=None, region_id=None):
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self._assert_valid_association(endpoint_id, service_id, region_id)
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self.driver.delete_policy_association(policy_id, endpoint_id,
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service_id, region_id)
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def list_endpoints_for_policy(self, policy_id):
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def _get_endpoint(endpoint_id, policy_id):
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try:
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return PROVIDERS.catalog_api.get_endpoint(endpoint_id)
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except exception.EndpointNotFound:
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msg = ('Endpoint %(endpoint_id)s referenced in '
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'association for policy %(policy_id)s not found.')
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LOG.warning(msg, {'policy_id': policy_id,
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'endpoint_id': endpoint_id})
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raise
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def _get_endpoints_for_service(service_id, endpoints):
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# TODO(henry-nash): Consider optimizing this in the future by
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# adding an explicit list_endpoints_for_service to the catalog API.
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return [ep for ep in endpoints if ep['service_id'] == service_id]
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def _get_endpoints_for_service_and_region(
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service_id, region_id, endpoints, regions):
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# TODO(henry-nash): Consider optimizing this in the future.
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# The lack of a two-way pointer in the region tree structure
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# makes this somewhat inefficient.
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def _recursively_get_endpoints_for_region(
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region_id, service_id, endpoint_list, region_list,
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endpoints_found, regions_examined):
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"""Recursively search down a region tree for endpoints.
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:param region_id: the point in the tree to examine
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:param service_id: the service we are interested in
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:param endpoint_list: list of all endpoints
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:param region_list: list of all regions
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:param endpoints_found: list of matching endpoints found so
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far - which will be updated if more are
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found in this iteration
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:param regions_examined: list of regions we have already looked
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at - used to spot illegal circular
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references in the tree to avoid never
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completing search
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:returns: list of endpoints that match
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"""
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if region_id in regions_examined:
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msg = ('Circular reference or a repeated entry found '
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'in region tree - %(region_id)s.')
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LOG.error(msg, {'region_id': ref.region_id})
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return
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regions_examined.append(region_id)
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endpoints_found += (
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[ep for ep in endpoint_list if
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ep['service_id'] == service_id and
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ep['region_id'] == region_id])
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for region in region_list:
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if region['parent_region_id'] == region_id:
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_recursively_get_endpoints_for_region(
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region['id'], service_id, endpoints, regions,
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endpoints_found, regions_examined)
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endpoints_found = []
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regions_examined = []
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# Now walk down the region tree
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_recursively_get_endpoints_for_region(
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region_id, service_id, endpoints, regions,
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endpoints_found, regions_examined)
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return endpoints_found
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matching_endpoints = []
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endpoints = PROVIDERS.catalog_api.list_endpoints()
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regions = PROVIDERS.catalog_api.list_regions()
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for ref in self.list_associations_for_policy(policy_id):
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if ref.get('endpoint_id') is not None:
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matching_endpoints.append(
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_get_endpoint(ref['endpoint_id'], policy_id))
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continue
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if (ref.get('service_id') is not None and
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ref.get('region_id') is None):
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matching_endpoints += _get_endpoints_for_service(
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ref['service_id'], endpoints)
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continue
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if (ref.get('service_id') is not None and
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ref.get('region_id') is not None):
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matching_endpoints += (
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_get_endpoints_for_service_and_region(
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ref['service_id'], ref['region_id'],
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endpoints, regions))
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continue
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msg = ('Unsupported policy association found - '
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'Policy %(policy_id)s, Endpoint %(endpoint_id)s, '
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'Service %(service_id)s, Region %(region_id)s, ')
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LOG.warning(msg, {'policy_id': policy_id,
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'endpoint_id': ref['endpoint_id'],
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'service_id': ref['service_id'],
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'region_id': ref['region_id']})
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return matching_endpoints
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def get_policy_for_endpoint(self, endpoint_id):
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def _get_policy(policy_id, endpoint_id):
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try:
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return PROVIDERS.policy_api.get_policy(policy_id)
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except exception.PolicyNotFound:
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msg = ('Policy %(policy_id)s referenced in association '
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'for endpoint %(endpoint_id)s not found.')
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LOG.warning(msg, {'policy_id': policy_id,
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'endpoint_id': endpoint_id})
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raise
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def _look_for_policy_for_region_and_service(endpoint):
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"""Look in the region and its parents for a policy.
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Examine the region of the endpoint for a policy appropriate for
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the service of the endpoint. If there isn't a match, then chase up
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the region tree to find one.
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"""
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region_id = endpoint['region_id']
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regions_examined = []
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while region_id is not None:
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try:
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ref = self.get_policy_association(
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service_id=endpoint['service_id'],
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region_id=region_id)
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return ref['policy_id']
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except exception.PolicyAssociationNotFound: # nosec
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# There wasn't one for that region & service, handle below.
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pass
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# There wasn't one for that region & service, let's
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# chase up the region tree
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regions_examined.append(region_id)
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region = PROVIDERS.catalog_api.get_region(region_id)
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region_id = None
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if region.get('parent_region_id') is not None:
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region_id = region['parent_region_id']
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if region_id in regions_examined:
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msg = ('Circular reference or a repeated entry '
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'found in region tree - %(region_id)s.')
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LOG.error(msg, {'region_id': region_id})
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break
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# First let's see if there is a policy explicitly defined for
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# this endpoint.
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try:
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ref = self.get_policy_association(endpoint_id=endpoint_id)
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return _get_policy(ref['policy_id'], endpoint_id)
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except exception.PolicyAssociationNotFound: # nosec
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# There wasn't a policy explicitly defined for this endpoint,
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# handled below.
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pass
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# There wasn't a policy explicitly defined for this endpoint, so
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# now let's see if there is one for the Region & Service.
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endpoint = PROVIDERS.catalog_api.get_endpoint(endpoint_id)
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policy_id = _look_for_policy_for_region_and_service(endpoint)
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if policy_id is not None:
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return _get_policy(policy_id, endpoint_id)
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# Finally, just check if there is one for the service.
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try:
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ref = self.get_policy_association(
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service_id=endpoint['service_id'])
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return _get_policy(ref['policy_id'], endpoint_id)
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except exception.PolicyAssociationNotFound: # nosec
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# No policy is associated with endpoint, handled below.
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pass
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msg = _('No policy is associated with endpoint '
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'%(endpoint_id)s.') % {'endpoint_id': endpoint_id}
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raise exception.NotFound(msg)
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