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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import os
import subprocess
import sys
import textwrap
import pretend
import pytest
from cryptography import utils
from cryptography.exceptions import InternalError, _Reasons
from cryptography.hazmat.backends.openssl.backend import (
Backend, backend
)
from cryptography.hazmat.backends.openssl.ec import _sn_to_elliptic_curve
from cryptography.hazmat.primitives import hashes, interfaces
from cryptography.hazmat.primitives.asymmetric import dsa, padding
from cryptography.hazmat.primitives.ciphers import (
BlockCipherAlgorithm, Cipher, CipherAlgorithm
)
from cryptography.hazmat.primitives.ciphers.algorithms import AES
from cryptography.hazmat.primitives.ciphers.modes import CBC, CTR, Mode
from ..primitives.fixtures_rsa import RSA_KEY_512
from ...utils import load_vectors_from_file, raises_unsupported_algorithm
@utils.register_interface(Mode)
class DummyMode(object):
name = "dummy-mode"
def validate_for_algorithm(self, algorithm):
pass
@utils.register_interface(CipherAlgorithm)
class DummyCipher(object):
name = "dummy-cipher"
key_size = None
@utils.register_interface(interfaces.AsymmetricPadding)
class DummyPadding(object):
name = "dummy-cipher"
@utils.register_interface(hashes.HashAlgorithm)
class DummyHash(object):
name = "dummy-hash"
block_size = None
digest_size = None
class DummyMGF(object):
_salt_length = 0
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_aes_ctr_always_available(self):
# AES CTR should always be available in both 0.9.8 and 1.0.0+
assert backend.cipher_supported(AES(b"\x00" * 16),
CTR(b"\x00" * 16)) is True
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 raises_unsupported_algorithm(_Reasons.UNSUPPORTED_CIPHER):
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 raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
backend.derive_pbkdf2_hmac(hashes.SHA256(), 10, b"", 1000, b"")
@pytest.mark.skipif(
backend._lib.OPENSSL_VERSION_NUMBER >= 0x1000000f,
reason="Requires an older OpenSSL. Must be < 1.0.0"
)
def test_large_key_size_on_old_openssl(self):
with pytest.raises(ValueError):
dsa.generate_parameters(2048, backend=backend)
with pytest.raises(ValueError):
dsa.generate_parameters(3072, backend=backend)
@pytest.mark.skipif(
backend._lib.OPENSSL_VERSION_NUMBER < 0x1000000f,
reason="Requires a newer OpenSSL. Must be >= 1.0.0"
)
def test_large_key_size_on_new_openssl(self):
parameters = dsa.generate_parameters(2048, backend)
param_num = parameters.parameter_numbers()
assert utils.bit_length(param_num.p) == 2048
parameters = dsa.generate_parameters(3072, backend)
param_num = parameters.parameter_numbers()
assert utils.bit_length(param_num.p) == 3072
def test_int_to_bn(self):
value = (2 ** 4242) - 4242
bn = backend._int_to_bn(value)
assert bn != backend._ffi.NULL
bn = backend._ffi.gc(bn, backend._lib.BN_free)
assert bn
assert backend._bn_to_int(bn) == value
def test_int_to_bn_inplace(self):
value = (2 ** 4242) - 4242
bn_ptr = backend._lib.BN_new()
assert bn_ptr != backend._ffi.NULL
bn_ptr = backend._ffi.gc(bn_ptr, backend._lib.BN_free)
bn = backend._int_to_bn(value, bn_ptr)
assert bn == bn_ptr
assert backend._bn_to_int(bn_ptr) == value
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_engine_is_default(self, tmpdir):
engine_printer = textwrap.dedent(
"""
import sys
from cryptography.hazmat.backends.openssl.backend import backend
e = backend._lib.ENGINE_get_default_RAND()
name = backend._lib.ENGINE_get_name(e)
sys.stdout.write(backend._ffi.string(name).decode('ascii'))
res = backend._lib.ENGINE_free(e)
assert res == 1
"""
)
engine_name = tmpdir.join('engine_name')
with engine_name.open('w') as out:
subprocess.check_call(
[sys.executable, "-c", engine_printer],
stdout=out
)
osrandom_engine_name = backend._ffi.string(
backend._lib.Cryptography_osrandom_engine_name
)
assert engine_name.read().encode('ascii') == 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_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
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
class TestOpenSSLRSA(object):
def test_generate_rsa_parameters_supported(self):
assert backend.generate_rsa_parameters_supported(1, 1024) is False
assert backend.generate_rsa_parameters_supported(4, 1024) is False
assert backend.generate_rsa_parameters_supported(3, 1024) is True
assert backend.generate_rsa_parameters_supported(3, 511) is False
def test_generate_bad_public_exponent(self):
with pytest.raises(ValueError):
backend.generate_rsa_private_key(public_exponent=1, key_size=2048)
with pytest.raises(ValueError):
backend.generate_rsa_private_key(public_exponent=4, key_size=2048)
def test_cant_generate_insecure_tiny_key(self):
with pytest.raises(ValueError):
backend.generate_rsa_private_key(public_exponent=65537,
key_size=511)
with pytest.raises(ValueError):
backend.generate_rsa_private_key(public_exponent=65537,
key_size=256)
@pytest.mark.skipif(
backend._lib.OPENSSL_VERSION_NUMBER >= 0x1000100f,
reason="Requires an older OpenSSL. Must be < 1.0.1"
)
def test_non_sha1_pss_mgf1_hash_algorithm_on_old_openssl(self):
private_key = RSA_KEY_512.private_key(backend)
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
private_key.signer(
padding.PSS(
mgf=padding.MGF1(
algorithm=hashes.SHA256(),
),
salt_length=padding.PSS.MAX_LENGTH
),
hashes.SHA1()
)
public_key = private_key.public_key()
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
public_key.verifier(
b"sig",
padding.PSS(
mgf=padding.MGF1(
algorithm=hashes.SHA256(),
),
salt_length=padding.PSS.MAX_LENGTH
),
hashes.SHA1()
)
def test_rsa_padding_unsupported_pss_mgf1_hash(self):
assert backend.rsa_padding_supported(
padding.PSS(mgf=padding.MGF1(DummyHash()), salt_length=0)
) is False
def test_rsa_padding_unsupported(self):
assert backend.rsa_padding_supported(DummyPadding()) is False
def test_rsa_padding_supported_pkcs1v15(self):
assert backend.rsa_padding_supported(padding.PKCS1v15()) is True
def test_rsa_padding_supported_pss(self):
assert backend.rsa_padding_supported(
padding.PSS(mgf=padding.MGF1(hashes.SHA1()), salt_length=0)
) is True
def test_rsa_padding_supported_oaep(self):
assert backend.rsa_padding_supported(
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA1(),
label=None
),
) is True
def test_rsa_padding_unsupported_mgf(self):
assert backend.rsa_padding_supported(
padding.OAEP(
mgf=DummyMGF(),
algorithm=hashes.SHA1(),
label=None
),
) is False
assert backend.rsa_padding_supported(
padding.PSS(mgf=DummyMGF(), salt_length=0)
) is False
def test_unsupported_mgf1_hash_algorithm_decrypt(self):
private_key = RSA_KEY_512.private_key(backend)
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
private_key.decrypt(
b"0" * 64,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA1(),
label=None
)
)
def test_unsupported_oaep_hash_algorithm_decrypt(self):
private_key = RSA_KEY_512.private_key(backend)
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
private_key.decrypt(
b"0" * 64,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA256(),
label=None
)
)
def test_unsupported_oaep_label_decrypt(self):
private_key = RSA_KEY_512.private_key(backend)
with pytest.raises(ValueError):
private_key.decrypt(
b"0" * 64,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA1(),
label=b"label"
)
)
@pytest.mark.skipif(
backend._lib.OPENSSL_VERSION_NUMBER <= 0x10001000,
reason="Requires an OpenSSL version >= 1.0.1"
)
class TestOpenSSLCMAC(object):
def test_unsupported_cipher(self):
@utils.register_interface(BlockCipherAlgorithm)
class FakeAlgorithm(object):
block_size = 64
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_CIPHER):
backend.create_cmac_ctx(FakeAlgorithm())
class TestOpenSSLSerialisationWithOpenSSL(object):
def test_pem_password_cb_buffer_too_small(self):
ffi_cb, cb = backend._pem_password_cb(b"aa")
assert cb(None, 1, False, None) == 0
def test_unsupported_evp_pkey_type(self):
key = pretend.stub(type="unsupported")
with raises_unsupported_algorithm(None):
backend._evp_pkey_to_private_key(key)
with raises_unsupported_algorithm(None):
backend._evp_pkey_to_public_key(key)
def test_very_long_pem_serialization_password(self):
password = "x" * 1024
with pytest.raises(ValueError):
load_vectors_from_file(
os.path.join(
"asymmetric", "Traditional_OpenSSL_Serialization",
"key1.pem"
),
lambda pemfile: (
backend.load_pem_private_key(
pemfile.read().encode(), password
)
)
)
class TestOpenSSLEllipticCurve(object):
def test_elliptic_curve_supported(self, monkeypatch):
monkeypatch.setattr(backend._lib, "Cryptography_HAS_EC", 0)
assert backend.elliptic_curve_supported(None) is False
def test_elliptic_curve_signature_algorithm_supported(self, monkeypatch):
monkeypatch.setattr(backend._lib, "Cryptography_HAS_EC", 0)
assert backend.elliptic_curve_signature_algorithm_supported(
None, None
) is False
def test_sn_to_elliptic_curve_not_supported(self):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_ELLIPTIC_CURVE):
_sn_to_elliptic_curve(backend, b"fake")
|