52f62c31f7
* Replace text.decode('hex') with binascii.unhexlify(text)
* test_barbican: base64 string is a bytes string
* tests-py3.txt: add keymgr tests
Partial-Implements: blueprint cinder-python3
Change-Id: Icc19fa354603857b259458b858e27c5bdd600360
137 lines
4.7 KiB
Python
137 lines
4.7 KiB
Python
# Copyright (c) 2013 The Johns Hopkins University/Applied Physics Laboratory
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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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"""
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An implementation of a key manager that reads its key from the project's
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configuration options.
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This key manager implementation provides limited security, assuming that the
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key remains secret. Using the volume encryption feature as an example,
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encryption provides protection against a lost or stolen disk, assuming that
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the configuration file that contains the key is not stored on the disk.
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Encryption also protects the confidentiality of data as it is transmitted via
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iSCSI from the compute host to the storage host (again assuming that an
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attacker who intercepts the data does not know the secret key).
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Because this implementation uses a single, fixed key, it proffers no
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protection once that key is compromised. In particular, different volumes
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encrypted with a key provided by this key manager actually share the same
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encryption key so *any* volume can be decrypted once the fixed key is known.
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"""
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import array
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import binascii
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from oslo_config import cfg
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from oslo_log import log as logging
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from cinder import exception
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from cinder.i18n import _, _LW
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from cinder.keymgr import key
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from cinder.keymgr import key_mgr
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key_mgr_opts = [
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cfg.StrOpt('fixed_key',
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help='Fixed key returned by key manager, specified in hex'),
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]
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CONF = cfg.CONF
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CONF.register_opts(key_mgr_opts, group='keymgr')
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LOG = logging.getLogger(__name__)
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class ConfKeyManager(key_mgr.KeyManager):
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"""Key Manager that supports one key defined by the fixed_key conf option.
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This key manager implementation supports all the methods specified by the
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key manager interface. This implementation creates a single key in response
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to all invocations of create_key. Side effects (e.g., raising exceptions)
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for each method are handled as specified by the key manager interface.
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"""
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def __init__(self):
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super(ConfKeyManager, self).__init__()
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self.key_id = '00000000-0000-0000-0000-000000000000'
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def _generate_key(self, **kwargs):
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_hex = self._generate_hex_key(**kwargs)
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key_list = array.array('B', binascii.unhexlify(_hex)).tolist()
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return key.SymmetricKey('AES', key_list)
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def _generate_hex_key(self, **kwargs):
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if CONF.keymgr.fixed_key is None:
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LOG.warning(
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_LW('config option keymgr.fixed_key has not been defined:'
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' some operations may fail unexpectedly'))
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raise ValueError(_('keymgr.fixed_key not defined'))
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return CONF.keymgr.fixed_key
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def create_key(self, ctxt, **kwargs):
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"""Creates a key.
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This implementation returns a UUID for the created key. A
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NotAuthorized exception is raised if the specified context is None.
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"""
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if ctxt is None:
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raise exception.NotAuthorized()
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return self.key_id
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def store_key(self, ctxt, key, **kwargs):
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"""Stores (i.e., registers) a key with the key manager."""
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if ctxt is None:
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raise exception.NotAuthorized()
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if key != self._generate_key():
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raise exception.KeyManagerError(
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reason="cannot store arbitrary keys")
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return self.key_id
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def copy_key(self, ctxt, key_id, **kwargs):
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if ctxt is None:
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raise exception.NotAuthorized()
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return self.key_id
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def get_key(self, ctxt, key_id, **kwargs):
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"""Retrieves the key identified by the specified id.
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This implementation returns the key that is associated with the
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specified UUID. A NotAuthorized exception is raised if the specified
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context is None; a KeyError is raised if the UUID is invalid.
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"""
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if ctxt is None:
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raise exception.NotAuthorized()
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if key_id != self.key_id:
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raise KeyError(key_id)
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return self._generate_key()
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def delete_key(self, ctxt, key_id, **kwargs):
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if ctxt is None:
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raise exception.NotAuthorized()
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if key_id != self.key_id:
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raise exception.KeyManagerError(
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reason="cannot delete non-existent key")
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LOG.warning(_LW("Not deleting key %s"), key_id)
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