Source code for

# Copyright 2012 OpenStack Foundation
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

"""Main entry point into the Trust service."""

from six.moves import zip

from keystone.common import manager
from keystone.common import provider_api
import keystone.conf
from keystone import exception
from keystone.i18n import _
from keystone import notifications

CONF = keystone.conf.CONF
PROVIDERS = provider_api.ProviderAPIs

[docs]class Manager(manager.Manager): """Default pivot point for the Trust backend. See :mod:`keystone.common.manager.Manager` for more details on how this dynamically calls the backend. """ driver_namespace = '' _provides_api = 'trust_api' _TRUST = "OS-TRUST:trust" def __init__(self): super(Manager, self).__init__( notifications.register_event_callback( notifications.ACTIONS.deleted, 'user', self._on_user_delete) def _on_user_delete(self, service, resource_type, operation, payload): # NOTE(davechen): Only delete the user that is maintained by # keystone will delete the related trust, since we don't know # when a LDAP user or federation user is deleted. user_id = payload['resource_info'] trusts = self.driver.list_trusts_for_trustee(user_id) trusts = trusts + self.driver.list_trusts_for_trustor(user_id) for trust in trusts: self.driver.delete_trust(trust['id']) @staticmethod def _validate_redelegation(redelegated_trust, trust): # Validate against: # 0 < redelegation_count <= max_redelegation_count max_redelegation_count = redelegation_depth = redelegated_trust.get('redelegation_count', 0) if not (0 < redelegation_depth <= max_redelegation_count): raise exception.Forbidden( _('Remaining redelegation depth of %(redelegation_depth)d' ' out of allowed range of [0..%(max_count)d]') % {'redelegation_depth': redelegation_depth, 'max_count': max_redelegation_count}) # remaining_uses is None remaining_uses = trust.get('remaining_uses') if remaining_uses is not None: raise exception.Forbidden( _('Field "remaining_uses" is set to %(value)s' ' while it must not be set in order to redelegate a trust'), value=remaining_uses) # expiry times trust_expiry = trust.get('expires_at') redelegated_expiry = redelegated_trust['expires_at'] if trust_expiry: # redelegated trust is from backend and has no tzinfo if redelegated_expiry < trust_expiry.replace(tzinfo=None): raise exception.Forbidden( _('Requested expiration time is more ' 'than redelegated trust can provide')) else: trust['expires_at'] = redelegated_expiry # trust roles is a subset of roles of the redelegated trust parent_roles = set(role['id'] for role in redelegated_trust['roles']) if not all(role['id'] in parent_roles for role in trust['roles']): raise exception.Forbidden( _('Some of requested roles are not in redelegated trust')) # forbid to create a trust (with impersonation set to true) from a # redelegated trust (with impersonation set to false) if not redelegated_trust['impersonation'] and trust['impersonation']: raise exception.Forbidden( _('Impersonation is not allowed because redelegated trust ' 'does not specify impersonation. Redelegated trust id: %s') % redelegated_trust['id'])
[docs] def get_trust_pedigree(self, trust_id): trust = self.driver.get_trust(trust_id) trust_chain = [trust] while trust and trust.get('redelegated_trust_id'): trust = self.driver.get_trust(trust['redelegated_trust_id']) trust_chain.append(trust) return trust_chain
[docs] def get_trust(self, trust_id, deleted=False): trust = self.driver.get_trust(trust_id, deleted) if trust and trust.get('redelegated_trust_id') and not deleted: trust_chain = self.get_trust_pedigree(trust_id) for parent, child in zip(trust_chain[1:], trust_chain): self._validate_redelegation(parent, child) try: PROVIDERS.identity_api.assert_user_enabled( parent['trustee_user_id']) except (AssertionError, exception.NotFound): raise exception.Forbidden( _('One of the trust agents is disabled or deleted')) return trust
[docs] def create_trust(self, trust_id, trust, roles, redelegated_trust=None, initiator=None): """Create a new trust. :returns: a new trust """ # Default for initial trust in chain is max_redelegation_count max_redelegation_count = requested_count = trust.get('redelegation_count') redelegatable = (trust.pop('allow_redelegation', False) and requested_count != 0) if not redelegatable: trust['redelegation_count'] = requested_count = 0 remaining_uses = trust.get('remaining_uses') if remaining_uses is not None and remaining_uses <= 0: msg = _('remaining_uses must be a positive integer or null.') raise exception.ValidationError(msg) else: # Validate requested redelegation depth if requested_count and requested_count > max_redelegation_count: raise exception.Forbidden( _('Requested redelegation depth of %(requested_count)d ' 'is greater than allowed %(max_count)d') % {'requested_count': requested_count, 'max_count': max_redelegation_count}) # Decline remaining_uses if trust.get('remaining_uses') is not None: raise exception.ValidationError( _('remaining_uses must not be set if redelegation is ' 'allowed')) if redelegated_trust: trust['redelegated_trust_id'] = redelegated_trust['id'] remaining_count = redelegated_trust['redelegation_count'] - 1 # Validate depth consistency if (redelegatable and requested_count and requested_count != remaining_count): msg = _('Modifying "redelegation_count" upon redelegation is ' 'forbidden. Omitting this parameter is advised.') raise exception.Forbidden(msg) trust.setdefault('redelegation_count', remaining_count) # Check entire trust pedigree validity pedigree = self.get_trust_pedigree(redelegated_trust['id']) for t in pedigree: self._validate_redelegation(t, trust) trust.setdefault('redelegation_count', max_redelegation_count) ref = self.driver.create_trust(trust_id, trust, roles) notifications.Audit.created(self._TRUST, trust_id, initiator=initiator) return ref
[docs] def delete_trust(self, trust_id, initiator=None): """Remove a trust. :raises keystone.exception.TrustNotFound: If the trust doesn't exist. Recursively remove given and redelegated trusts """ trust = self.driver.get_trust(trust_id) trusts = self.driver.list_trusts_for_trustor( trust['trustor_user_id']) for t in trusts: if t.get('redelegated_trust_id') == trust_id: # recursive call to make sure all notifications are sent try: self.delete_trust(t['id']) except exception.TrustNotFound: # nosec # if trust was deleted by concurrent process # consistency must not suffer pass # end recursion self.driver.delete_trust(trust_id) notifications.Audit.deleted(self._TRUST, trust_id, initiator)
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