64 lines
2.5 KiB
Python
64 lines
2.5 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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from oslo_config import cfg
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from nova.i18n import _
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from nova.keymgr import single_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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class ConfKeyManager(single_key_mgr.SingleKeyManager):
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"""This key manager implementation supports all the methods specified by
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the key manager interface. This implementation creates a single key in
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response to all invocations of create_key. Side effects
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(e.g., raising exceptions) for each method are handled
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as specified by the key manager interface.
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"""
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def __init__(self):
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if CONF.keymgr.fixed_key is None:
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raise ValueError(_('keymgr.fixed_key not defined'))
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self._hex_key = CONF.keymgr.fixed_key
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super(ConfKeyManager, self).__init__()
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def _generate_hex_key(self, **kwargs):
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return self._hex_key
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