1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
# Copyright DataStax, Inc.
#
# 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.
import os
import unittest
from cassandra.policies import ColDesc
from cassandra.column_encryption.policies import AES256ColumnEncryptionPolicy, \
AES256_BLOCK_SIZE_BYTES, AES256_KEY_SIZE_BYTES
class AES256ColumnEncryptionPolicyTest(unittest.TestCase):
def _random_block(self):
return os.urandom(AES256_BLOCK_SIZE_BYTES)
def _random_key(self):
return os.urandom(AES256_KEY_SIZE_BYTES)
def _test_round_trip(self, bytes):
coldesc = ColDesc('ks1','table1','col1')
policy = AES256ColumnEncryptionPolicy()
policy.add_column(coldesc, self._random_key(), "blob")
encrypted_bytes = policy.encrypt(coldesc, bytes)
self.assertEqual(bytes, policy.decrypt(coldesc, encrypted_bytes))
def test_no_padding_necessary(self):
self._test_round_trip(self._random_block())
def test_some_padding_required(self):
for byte_size in range(1,AES256_BLOCK_SIZE_BYTES - 1):
bytes = os.urandom(byte_size)
self._test_round_trip(bytes)
for byte_size in range(AES256_BLOCK_SIZE_BYTES + 1,(2 * AES256_BLOCK_SIZE_BYTES) - 1):
bytes = os.urandom(byte_size)
self._test_round_trip(bytes)
def test_add_column_invalid_key_size_raises(self):
coldesc = ColDesc('ks1','table1','col1')
policy = AES256ColumnEncryptionPolicy()
for key_size in range(1,AES256_KEY_SIZE_BYTES - 1):
with self.assertRaises(ValueError):
policy.add_column(coldesc, os.urandom(key_size), "blob")
for key_size in range(AES256_KEY_SIZE_BYTES + 1,(2 * AES256_KEY_SIZE_BYTES) - 1):
with self.assertRaises(ValueError):
policy.add_column(coldesc, os.urandom(key_size), "blob")
def test_add_column_invalid_iv_size_raises(self):
def test_iv_size(iv_size):
policy = AES256ColumnEncryptionPolicy(iv = os.urandom(iv_size))
policy.add_column(coldesc, os.urandom(AES256_KEY_SIZE_BYTES), "blob")
policy.encrypt(coldesc, os.urandom(128))
coldesc = ColDesc('ks1','table1','col1')
for iv_size in range(1,AES256_BLOCK_SIZE_BYTES - 1):
with self.assertRaises(ValueError):
test_iv_size(iv_size)
for iv_size in range(AES256_BLOCK_SIZE_BYTES + 1,(2 * AES256_BLOCK_SIZE_BYTES) - 1):
with self.assertRaises(ValueError):
test_iv_size(iv_size)
# Finally, confirm that the expected IV size has no issue
test_iv_size(AES256_BLOCK_SIZE_BYTES)
def test_add_column_null_coldesc_raises(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
policy.add_column(None, self._random_block(), "blob")
def test_add_column_null_key_raises(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, None, "blob")
def test_add_column_null_type_raises(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, self._random_block(), None)
def test_add_column_unknown_type_raises(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, self._random_block(), "foobar")
def test_encode_and_encrypt_null_coldesc_raises(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, self._random_key(), "blob")
policy.encode_and_encrypt(None, self._random_block())
def test_encode_and_encrypt_null_obj_raises(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, self._random_key(), "blob")
policy.encode_and_encrypt(coldesc, None)
def test_encode_and_encrypt_unknown_coldesc_raises(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, self._random_key(), "blob")
policy.encode_and_encrypt(ColDesc('ks2','table2','col2'), self._random_block())
def test_contains_column(self):
coldesc = ColDesc('ks1','table1','col1')
policy = AES256ColumnEncryptionPolicy()
policy.add_column(coldesc, self._random_key(), "blob")
self.assertTrue(policy.contains_column(coldesc))
self.assertFalse(policy.contains_column(ColDesc('ks2','table1','col1')))
self.assertFalse(policy.contains_column(ColDesc('ks1','table2','col1')))
self.assertFalse(policy.contains_column(ColDesc('ks1','table1','col2')))
self.assertFalse(policy.contains_column(ColDesc('ks2','table2','col2')))
def test_encrypt_unknown_column(self):
with self.assertRaises(ValueError):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, self._random_key(), "blob")
policy.encrypt(ColDesc('ks2','table2','col2'), self._random_block())
def test_decrypt_unknown_column(self):
policy = AES256ColumnEncryptionPolicy()
coldesc = ColDesc('ks1','table1','col1')
policy.add_column(coldesc, self._random_key(), "blob")
encrypted_bytes = policy.encrypt(coldesc, self._random_block())
with self.assertRaises(ValueError):
policy.decrypt(ColDesc('ks2','table2','col2'), encrypted_bytes)
def test_cache_info(self):
# Exclude any interference from tests above
AES256ColumnEncryptionPolicy._build_cipher.cache_clear()
coldesc1 = ColDesc('ks1','table1','col1')
coldesc2 = ColDesc('ks2','table2','col2')
coldesc3 = ColDesc('ks3','table3','col3')
policy = AES256ColumnEncryptionPolicy()
for coldesc in [coldesc1, coldesc2, coldesc3]:
policy.add_column(coldesc, self._random_key(), "blob")
# First run for this coldesc should be a miss, everything else should be a cache hit
for _ in range(10):
policy.encrypt(coldesc1, self._random_block())
cache_info = policy.cache_info()
self.assertEqual(cache_info.hits, 9)
self.assertEqual(cache_info.misses, 1)
self.assertEqual(cache_info.maxsize, 128)
# Important note: we're measuring the size of the cache of ciphers, NOT stored
# keys. We won't have a cipher here until we actually encrypt something
self.assertEqual(cache_info.currsize, 1)
policy.encrypt(coldesc2, self._random_block())
self.assertEqual(policy.cache_info().currsize, 2)
policy.encrypt(coldesc3, self._random_block())
self.assertEqual(policy.cache_info().currsize, 3)
|
