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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
# 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 pytest
from cryptography import utils
from cryptography.exceptions import (
UnsupportedCipher, UnsupportedHash, InternalError
)
from cryptography.hazmat.backends.openssl.backend import backend, Backend
from cryptography.hazmat.primitives import interfaces, hashes
from cryptography.hazmat.primitives.ciphers import Cipher
from cryptography.hazmat.primitives.ciphers.algorithms import AES
from cryptography.hazmat.primitives.ciphers.modes import CBC
@utils.register_interface(interfaces.Mode)
class DummyMode(object):
name = "dummy-mode"
def validate_for_algorithm(self, algorithm):
pass
@utils.register_interface(interfaces.CipherAlgorithm)
class DummyCipher(object):
name = "dummy-cipher"
class TestOpenSSL(object):
def test_backend_exists(self):
assert backend
def test_openssl_version_text(self):
"""
This test checks the value of OPENSSL_VERSION_TEXT.
Unfortunately, this define does not appear to have a
formal content definition, so for now we'll test to see
if it starts with OpenSSL as that appears to be true
for every OpenSSL.
"""
assert backend.openssl_version_text().startswith("OpenSSL")
def test_supports_cipher(self):
assert backend.cipher_supported(None, None) is False
def test_register_duplicate_cipher_adapter(self):
with pytest.raises(ValueError):
backend.register_cipher_adapter(AES, CBC, None)
@pytest.mark.parametrize("mode", [DummyMode(), None])
def test_nonexistent_cipher(self, mode):
b = Backend()
b.register_cipher_adapter(
DummyCipher,
type(mode),
lambda backend, cipher, mode: backend._ffi.NULL
)
cipher = Cipher(
DummyCipher(), mode, backend=b,
)
with pytest.raises(UnsupportedCipher):
cipher.encryptor()
def test_consume_errors(self):
for i in range(10):
backend._lib.ERR_put_error(backend._lib.ERR_LIB_EVP, 0, 0,
b"test_openssl.py", -1)
assert backend._lib.ERR_peek_error() != 0
errors = backend._consume_errors()
assert backend._lib.ERR_peek_error() == 0
assert len(errors) == 10
def test_openssl_error_string(self):
backend._lib.ERR_put_error(
backend._lib.ERR_LIB_EVP,
backend._lib.EVP_F_EVP_DECRYPTFINAL_EX,
0,
b"test_openssl.py",
-1
)
errors = backend._consume_errors()
exc = backend._unknown_error(errors[0])
assert (
"digital envelope routines:"
"EVP_DecryptFinal_ex:digital envelope routines" in str(exc)
)
def test_ssl_ciphers_registered(self):
meth = backend._lib.TLSv1_method()
ctx = backend._lib.SSL_CTX_new(meth)
assert ctx != backend._ffi.NULL
backend._lib.SSL_CTX_free(ctx)
def test_evp_ciphers_registered(self):
cipher = backend._lib.EVP_get_cipherbyname(b"aes-256-cbc")
assert cipher != backend._ffi.NULL
def test_error_strings_loaded(self):
# returns a value in a static buffer
err = backend._lib.ERR_error_string(101183626, backend._ffi.NULL)
assert backend._ffi.string(err) == (
b"error:0607F08A:digital envelope routines:EVP_EncryptFinal_ex:"
b"data not multiple of block length"
)
def test_unknown_error_in_cipher_finalize(self):
cipher = Cipher(AES(b"\0" * 16), CBC(b"\0" * 16), backend=backend)
enc = cipher.encryptor()
enc.update(b"\0")
backend._lib.ERR_put_error(0, 0, 1,
b"test_openssl.py", -1)
with pytest.raises(InternalError):
enc.finalize()
def test_derive_pbkdf2_raises_unsupported_on_old_openssl(self):
if backend.pbkdf2_hmac_supported(hashes.SHA256()):
pytest.skip("Requires an older OpenSSL")
with pytest.raises(UnsupportedHash):
backend.derive_pbkdf2_hmac(hashes.SHA256(), 10, b"", 1000, b"")
# This test is not in the next class because to check if it's really
# default we don't want to run the setup_method before it
def test_osrandom_engine_is_default(self):
e = backend._lib.ENGINE_get_default_RAND()
name = backend._lib.ENGINE_get_name(e)
assert name == backend._lib.Cryptography_osrandom_engine_name
res = backend._lib.ENGINE_free(e)
assert res == 1
class TestOpenSSLRandomEngine(object):
def teardown_method(self, method):
# we need to reset state to being default. backend is a shared global
# for all these tests.
backend.activate_osrandom_engine()
current_default = backend._lib.ENGINE_get_default_RAND()
name = backend._lib.ENGINE_get_name(current_default)
assert name == backend._lib.Cryptography_osrandom_engine_name
def test_osrandom_sanity_check(self):
# This test serves as a check against catastrophic failure.
buf = backend._ffi.new("char[]", 500)
res = backend._lib.RAND_bytes(buf, 500)
assert res == 1
assert backend._ffi.buffer(buf)[:] != "\x00" * 500
def test_activate_osrandom_already_default(self):
e = backend._lib.ENGINE_get_default_RAND()
name = backend._lib.ENGINE_get_name(e)
assert name == backend._lib.Cryptography_osrandom_engine_name
res = backend._lib.ENGINE_free(e)
assert res == 1
backend.activate_osrandom_engine()
e = backend._lib.ENGINE_get_default_RAND()
name = backend._lib.ENGINE_get_name(e)
assert name == backend._lib.Cryptography_osrandom_engine_name
res = backend._lib.ENGINE_free(e)
assert res == 1
def test_activate_osrandom_no_default(self):
backend.activate_builtin_random()
e = backend._lib.ENGINE_get_default_RAND()
assert e == backend._ffi.NULL
backend.activate_osrandom_engine()
e = backend._lib.ENGINE_get_default_RAND()
name = backend._lib.ENGINE_get_name(e)
assert name == backend._lib.Cryptography_osrandom_engine_name
res = backend._lib.ENGINE_free(e)
assert res == 1
def test_activate_builtin_random(self):
e = backend._lib.ENGINE_get_default_RAND()
assert e != backend._ffi.NULL
name = backend._lib.ENGINE_get_name(e)
assert name == backend._lib.Cryptography_osrandom_engine_name
res = backend._lib.ENGINE_free(e)
assert res == 1
backend.activate_builtin_random()
e = backend._lib.ENGINE_get_default_RAND()
assert e == backend._ffi.NULL
def test_activate_builtin_random_already_active(self):
backend.activate_builtin_random()
e = backend._lib.ENGINE_get_default_RAND()
assert e == backend._ffi.NULL
backend.activate_builtin_random()
e = backend._lib.ENGINE_get_default_RAND()
assert e == backend._ffi.NULL
|
