97 lines
3.2 KiB
Python
97 lines
3.2 KiB
Python
#
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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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import base64
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import sys
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from Crypto.Cipher import AES
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from cryptography import fernet
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from oslo_config import cfg
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from oslo_utils import encodeutils
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from heat.common.i18n import _
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from heat.openstack.common.crypto import utils
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auth_opts = [
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cfg.StrOpt('auth_encryption_key',
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secret=True,
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default='notgood but just long enough i t',
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help=_('Key used to encrypt authentication info in the '
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'database. Length of this key must be 32 characters.'))
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]
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cfg.CONF.register_opts(auth_opts)
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def encrypt(value, encryption_key=None):
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if value is None:
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return None, None
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encryption_key = get_valid_encryption_key(encryption_key, fix_length=True)
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sym = fernet.Fernet(encryption_key.encode('base64'))
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res = sym.encrypt(encodeutils.safe_encode(value))
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return 'cryptography_decrypt_v1', res
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def decrypt(method, data, encryption_key=None):
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if method is None or data is None:
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return None
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decryptor = getattr(sys.modules[__name__], method)
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value = decryptor(data, encryption_key)
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if value is not None:
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return encodeutils.safe_decode(value, 'utf-8')
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def oslo_decrypt_v1(value, encryption_key=None):
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encryption_key = get_valid_encryption_key(encryption_key)
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sym = utils.SymmetricCrypto()
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return sym.decrypt(encryption_key,
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value, b64decode=True)
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def cryptography_decrypt_v1(value, encryption_key=None):
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encryption_key = get_valid_encryption_key(encryption_key, fix_length=True)
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sym = fernet.Fernet(encryption_key.encode('base64'))
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return sym.decrypt(encodeutils.safe_encode(value))
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def get_valid_encryption_key(encryption_key, fix_length=False):
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if encryption_key is None:
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encryption_key = cfg.CONF.auth_encryption_key
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if fix_length and len(encryption_key) < 32:
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# Backward compatible size
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encryption_key = encryption_key * 2
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return encryption_key[:32]
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def heat_decrypt(value, encryption_key=None):
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"""Decrypt function for data that has been encrypted using an older
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version of Heat.
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Note: the encrypt function returns the function that is needed to
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decrypt the data. The database then stores this. When the data is
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then retrieved (potentially by a later version of Heat) the decrypt
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function must still exist. So whilst it may seem that this function
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is not referenced, it will be referenced from the database.
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"""
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encryption_key = get_valid_encryption_key(encryption_key)
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auth = base64.b64decode(value)
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iv = auth[:AES.block_size]
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cipher = AES.new(encryption_key, AES.MODE_CFB, iv)
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res = cipher.decrypt(auth[AES.block_size:])
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return res
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def list_opts():
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yield None, auth_opts
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