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# -*- coding: utf-8 -*-
# Copyright 2015 Google Inc. 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.
"""Unit tests for encryption_helper."""
from __future__ import absolute_import
from __future__ import print_function
from __future__ import division
from __future__ import unicode_literals
import base64
import os
import six
import boto
from gslib.exception import CommandException
from gslib.tests.testcase.unit_testcase import GsUtilUnitTestCase
from gslib.tests.util import SetBotoConfigForTest
from gslib.utils.encryption_helper import Base64Sha256FromBase64EncryptionKey
from gslib.utils.encryption_helper import CryptoKeyWrapperFromKey
from gslib.utils.encryption_helper import FindMatchingCSEKInBotoConfig
class TestEncryptionHelper(GsUtilUnitTestCase):
"""Unit tests for encryption helper functions."""
def testMaxDecryptionKeys(self):
"""Tests a config file with the maximum number of decryption keys."""
keys = []
boto_101_key_config = []
# Generate 101 keys.
for i in range(1, 102):
try:
keys.append(base64.encodebytes(os.urandom(32)).rstrip(b'\n'))
except AttributeError:
# For Python 2 compatability.
keys.append(base64.encodestring(os.urandom(32)).rstrip(b'\n'))
boto_101_key_config.append(
('GSUtil', 'decryption_key%s' % i, keys[i - 1]))
with SetBotoConfigForTest(boto_101_key_config):
self.assertIsNotNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[0]), boto.config))
self.assertIsNotNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[99]), boto.config))
# Only 100 keys are supported.
self.assertIsNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[100]), boto.config))
boto_100_key_config = list(boto_101_key_config)
boto_100_key_config.pop()
with SetBotoConfigForTest(boto_100_key_config):
self.assertIsNotNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[0]), boto.config))
self.assertIsNotNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[99]), boto.config))
def testNonSequentialDecryptionKeys(self):
"""Tests a config file with non-sequential decryption key numbering."""
keys = []
for _ in range(3):
try:
keys.append(base64.encodebytes(os.urandom(32)).rstrip(b'\n'))
except AttributeError:
# For Python 2 compatability.
keys.append(base64.encodestring(os.urandom(32)).rstrip(b'\n'))
boto_config = [('GSUtil', 'decryption_key4', keys[2]),
('GSUtil', 'decryption_key1', keys[0]),
('GSUtil', 'decryption_key2', keys[1])]
with SetBotoConfigForTest(boto_config):
# Because decryption_key3 does not exist in boto_config, decryption_key4
# should be ignored.
self.assertIsNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[2]), boto.config))
# decryption_key1 and decryption_key2 should work, though.
self.assertIsNotNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[0]), boto.config))
self.assertIsNotNone(
FindMatchingCSEKInBotoConfig(
Base64Sha256FromBase64EncryptionKey(keys[1]), boto.config))
def testInvalidCSEKConfigurationRaises(self):
invalid_key = 'aP7KbmxLqDw1SWHeKvlfKOVgNRNNZc8L2sFz8ybLN==='
with self.assertRaises(CommandException) as cm:
CryptoKeyWrapperFromKey(invalid_key)
self.assertIn(
'Configured encryption_key or decryption_key looked like a CSEK',
cm.exception.reason)
def testInvalidCMEKConfigurationRaises(self):
invalid_key = (
'projects/my-project/locations/some-location/keyRings/keyring/'
'cryptoKeyWHOOPS-INVALID-RESOURCE-PORTION/somekey')
with self.assertRaises(CommandException) as cm:
CryptoKeyWrapperFromKey(invalid_key)
self.assertIn(
'Configured encryption_key or decryption_key looked like a CMEK',
cm.exception.reason)