99 lines
2.8 KiB
Python
99 lines
2.8 KiB
Python
# Copyright (c) 2017 VMware, Inc. 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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"""Encryption module for handling passwords in Congress."""
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from __future__ import print_function
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from __future__ import division
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from __future__ import absolute_import
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import io
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import os
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from cryptography import fernet
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from cryptography.fernet import Fernet
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from oslo_config import cfg
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from oslo_log import log as logging
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LOG = logging.getLogger(__name__)
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__key = None
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__fernet = None
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def _get_key_file_path():
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return os.path.join(cfg.CONF.encryption_key_path, 'aes_key')
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def key_file_exists():
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return os.path.isfile(_get_key_file_path())
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def read_key_from_file():
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with io.open(_get_key_file_path(), 'r', encoding='ascii') as key_file:
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key = str(key_file.read()).encode('ascii')
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return key
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def create_new_key_file():
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LOG.debug("Generate new key file")
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dir_path = os.path.dirname(_get_key_file_path())
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if not os.path.isdir(dir_path):
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os.makedirs(dir_path, mode=0o700) # important: restrictive permissions
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key = Fernet.generate_key()
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# first create file with restrictive permissions, then write key
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# two separate file opens because each version supports
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# permissions and encoding respectively, but neither supports both.
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with os.fdopen(os.open(_get_key_file_path(), os.O_CREAT | os.O_WRONLY,
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0o600), 'w'):
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pass
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with io.open(_get_key_file_path(), 'w', encoding='ascii') as key_file:
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key_file.write(key.decode('ascii'))
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return key
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def initialize_key():
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'''initialize key.'''
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global __key
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global __fernet
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if key_file_exists():
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__key = read_key_from_file()
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else:
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__key = create_new_key_file()
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__fernet = Fernet(__key)
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def initialize_if_needed():
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'''initialize key if not already initialized.'''
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global __fernet
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if not __fernet:
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initialize_key()
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def encrypt(string):
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initialize_if_needed()
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return __fernet.encrypt(string.encode('utf-8')).decode('utf-8')
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class InvalidToken(fernet.InvalidToken):
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pass
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def decrypt(string):
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initialize_if_needed()
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try:
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return __fernet.decrypt(string.encode('utf-8')).decode('utf-8')
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except fernet.InvalidToken as exc:
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raise InvalidToken(exc)
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