215 lines
8.4 KiB
Python
215 lines
8.4 KiB
Python
# Copyright 2012 OpenStack Foundation
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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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"""Main entry point into the Trust service."""
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from oslo_log import versionutils
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from six.moves import zip
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from keystone.common import dependency
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from keystone.common import manager
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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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from keystone import notifications
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from keystone.trust.backends import base
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CONF = keystone.conf.CONF
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@dependency.requires('identity_api')
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@dependency.provider('trust_api')
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class Manager(manager.Manager):
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"""Default pivot point for the Trust 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.trust'
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_TRUST = "OS-TRUST:trust"
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def __init__(self):
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super(Manager, self).__init__(CONF.trust.driver)
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@staticmethod
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def _validate_redelegation(redelegated_trust, trust):
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# Validate against:
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# 0 < redelegation_count <= max_redelegation_count
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max_redelegation_count = CONF.trust.max_redelegation_count
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redelegation_depth = redelegated_trust.get('redelegation_count', 0)
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if not (0 < redelegation_depth <= max_redelegation_count):
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raise exception.Forbidden(
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_('Remaining redelegation depth of %(redelegation_depth)d'
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' out of allowed range of [0..%(max_count)d]') %
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{'redelegation_depth': redelegation_depth,
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'max_count': max_redelegation_count})
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# remaining_uses is None
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remaining_uses = trust.get('remaining_uses')
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if remaining_uses is not None:
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raise exception.Forbidden(
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_('Field "remaining_uses" is set to %(value)s'
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' while it must not be set in order to redelegate a trust'),
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value=remaining_uses)
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# expiry times
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trust_expiry = trust.get('expires_at')
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redelegated_expiry = redelegated_trust['expires_at']
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if trust_expiry:
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# redelegated trust is from backend and has no tzinfo
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if redelegated_expiry < trust_expiry.replace(tzinfo=None):
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raise exception.Forbidden(
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_('Requested expiration time is more '
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'than redelegated trust can provide'))
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else:
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trust['expires_at'] = redelegated_expiry
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# trust roles is a subset of roles of the redelegated trust
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parent_roles = set(role['id']
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for role in redelegated_trust['roles'])
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if not all(role['id'] in parent_roles for role in trust['roles']):
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raise exception.Forbidden(
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_('Some of requested roles are not in redelegated trust'))
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# forbid to create a trust (with impersonation set to true) from a
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# redelegated trust (with impersonation set to false)
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if not redelegated_trust['impersonation'] and trust['impersonation']:
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raise exception.Forbidden(
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_('Impersonation is not allowed because redelegated trust '
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'does not specify impersonation. Redelegated trust id: %s') %
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redelegated_trust['id'])
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def get_trust_pedigree(self, trust_id):
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trust = self.driver.get_trust(trust_id)
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trust_chain = [trust]
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while trust and trust.get('redelegated_trust_id'):
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trust = self.driver.get_trust(trust['redelegated_trust_id'])
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trust_chain.append(trust)
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return trust_chain
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def get_trust(self, trust_id, deleted=False):
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trust = self.driver.get_trust(trust_id, deleted)
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if trust and trust.get('redelegated_trust_id') and not deleted:
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trust_chain = self.get_trust_pedigree(trust_id)
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for parent, child in zip(trust_chain[1:], trust_chain):
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self._validate_redelegation(parent, child)
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try:
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self.identity_api.assert_user_enabled(
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parent['trustee_user_id'])
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except (AssertionError, exception.NotFound):
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raise exception.Forbidden(
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_('One of the trust agents is disabled or deleted'))
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return trust
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def create_trust(self, trust_id, trust, roles, redelegated_trust=None,
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initiator=None):
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"""Create a new trust.
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:returns: a new trust
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"""
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# Default for initial trust in chain is max_redelegation_count
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max_redelegation_count = CONF.trust.max_redelegation_count
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requested_count = trust.get('redelegation_count')
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redelegatable = (trust.pop('allow_redelegation', False)
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and requested_count != 0)
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if not redelegatable:
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trust['redelegation_count'] = requested_count = 0
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remaining_uses = trust.get('remaining_uses')
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if remaining_uses is not None and remaining_uses <= 0:
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msg = _('remaining_uses must be a positive integer or null.')
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raise exception.ValidationError(msg)
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else:
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# Validate requested redelegation depth
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if requested_count and requested_count > max_redelegation_count:
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raise exception.Forbidden(
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_('Requested redelegation depth of %(requested_count)d '
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'is greater than allowed %(max_count)d') %
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{'requested_count': requested_count,
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'max_count': max_redelegation_count})
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# Decline remaining_uses
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if trust.get('remaining_uses') is not None:
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raise exception.ValidationError(
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_('remaining_uses must not be set if redelegation is '
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'allowed'))
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if redelegated_trust:
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trust['redelegated_trust_id'] = redelegated_trust['id']
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remaining_count = redelegated_trust['redelegation_count'] - 1
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# Validate depth consistency
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if (redelegatable and requested_count and
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requested_count != remaining_count):
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msg = _('Modifying "redelegation_count" upon redelegation is '
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'forbidden. Omitting this parameter is advised.')
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raise exception.Forbidden(msg)
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trust.setdefault('redelegation_count', remaining_count)
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# Check entire trust pedigree validity
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pedigree = self.get_trust_pedigree(redelegated_trust['id'])
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for t in pedigree:
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self._validate_redelegation(t, trust)
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trust.setdefault('redelegation_count', max_redelegation_count)
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ref = self.driver.create_trust(trust_id, trust, roles)
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notifications.Audit.created(self._TRUST, trust_id, initiator=initiator)
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return ref
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def delete_trust(self, trust_id, initiator=None):
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"""Remove a trust.
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:raises keystone.exception.TrustNotFound: If the trust doesn't exist.
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Recursively remove given and redelegated trusts
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"""
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trust = self.driver.get_trust(trust_id)
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trusts = self.driver.list_trusts_for_trustor(
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trust['trustor_user_id'])
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for t in trusts:
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if t.get('redelegated_trust_id') == trust_id:
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# recursive call to make sure all notifications are sent
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try:
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self.delete_trust(t['id'])
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except exception.TrustNotFound: # nosec
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# if trust was deleted by concurrent process
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# consistency must not suffer
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pass
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# end recursion
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self.driver.delete_trust(trust_id)
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notifications.Audit.deleted(self._TRUST, trust_id, initiator)
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@versionutils.deprecated(
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versionutils.deprecated.NEWTON,
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what='keystone.trust.TrustDriverV8',
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in_favor_of='keystone.trust.backends.base.TrustDriverV8',
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remove_in=+1)
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class TrustDriverV8(base.TrustDriverV8):
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pass
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Driver = manager.create_legacy_driver(base.TrustDriverV8)
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