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OpenStack Study: single_key_mgr.py**** CubicPower OpenStack Study ****
# Copyright (c) 2013 The Johns Hopkins University/Applied Physics Laboratory # All Rights Reserved. # # 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 # # http://www.apache.org/licenses/LICENSE-2.0 # # 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. """ An implementation of a key manager that returns a single key in response to all invocations of get_key. """ from nova import exception from nova.keymgr import mock_key_mgr from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class SingleKeyManager(mock_key_mgr.MockKeyManager): """This key manager implementation supports all the methods specified by the key manager interface. This implementation creates a single key in response to all invocations of create_key. Side effects (e.g., raising exceptions) for each method are handled as specified by the key manager interface. """
**** CubicPower OpenStack Study **** def __init__(self): LOG.warn(_('This key manager is insecure and is not recommended for ' 'production deployments')) super(SingleKeyManager, self).__init__() self.key_id = '00000000-0000-0000-0000-000000000000' self.key = self._generate_key(key_length=256) # key should exist by default self.keys[self.key_id] = self.key
**** CubicPower OpenStack Study **** def _generate_hex_key(self, **kwargs): key_length = kwargs.get('key_length', 256) return '0' * (key_length / 4) # hex digit => 4 bits
**** CubicPower OpenStack Study **** def _generate_key_id(self): return self.key_id
**** CubicPower OpenStack Study **** def store_key(self, ctxt, key, **kwargs): if key != self.key: raise exception.KeyManagerError( reason="cannot store arbitrary keys") return super(SingleKeyManager, self).store_key(ctxt, key, **kwargs)
**** CubicPower OpenStack Study **** def delete_key(self, ctxt, key_id, **kwargs): if ctxt is None: raise exception.NotAuthorized() if key_id != self.key_id: raise exception.KeyManagerError( reason="cannot delete non-existent key") LOG.warn(_("Not deleting key %s"), key_id)
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