| # 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.interfaces import RSABackend |
| 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, serialization |
| from cryptography.hazmat.primitives.asymmetric import dsa, ec, 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_dsa import DSA_KEY_2048 |
| from ..primitives.fixtures_rsa import RSA_KEY_2048, RSA_KEY_512 |
| from ..primitives.test_ec import _skip_curve_unsupported |
| from ...utils import load_vectors_from_file, raises_unsupported_algorithm |
| |
| |
| def skip_if_libre_ssl(openssl_version): |
| if u'LibreSSL' in openssl_version: |
| pytest.skip("LibreSSL hard-codes RAND_bytes to use arc4random.") |
| |
| |
| class TestLibreSkip(object): |
| def test_skip_no(self): |
| assert skip_if_libre_ssl(u"OpenSSL 0.9.8zf 19 Mar 2015") is None |
| |
| def test_skip_yes(self): |
| with pytest.raises(pytest.skip.Exception): |
| skip_if_libre_ssl(u"LibreSSL 2.1.6") |
| |
| |
| @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(padding.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 or LibreSSL as that appears |
| to be true for every OpenSSL-alike. |
| """ |
| assert ( |
| backend.openssl_version_text().startswith("OpenSSL") or |
| backend.openssl_version_text().startswith("LibreSSL") |
| ) |
| |
| 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 |
| |
| def test_bn_to_int(self): |
| bn = backend._int_to_bn(0) |
| assert backend._bn_to_int(bn) == 0 |
| |
| def test_actual_osrandom_bytes(self, monkeypatch): |
| skip_if_libre_ssl(backend.openssl_version_text()) |
| sample_data = (b"\x01\x02\x03\x04" * 4) |
| length = len(sample_data) |
| |
| def notrandom(size): |
| assert size == length |
| return sample_data |
| monkeypatch.setattr(os, "urandom", notrandom) |
| buf = backend._ffi.new("char[]", length) |
| backend._lib.RAND_bytes(buf, length) |
| assert backend._ffi.buffer(buf)[0:length] == sample_data |
| |
| |
| 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._binding._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') |
| |
| # If we're running tests via ``python setup.py test`` in a clean |
| # environment then all of our dependencies are going to be installed |
| # into either the current directory or the .eggs directory. However the |
| # subprocess won't know to activate these dependencies, so we'll get it |
| # to do so by passing our entire sys.path into the subprocess via the |
| # PYTHONPATH environment variable. |
| env = os.environ.copy() |
| env["PYTHONPATH"] = os.pathsep.join(sys.path) |
| |
| with engine_name.open('w') as out: |
| subprocess.check_call( |
| [sys.executable, "-c", engine_printer], |
| env=env, |
| stdout=out |
| ) |
| |
| osrandom_engine_name = backend._ffi.string( |
| backend._binding._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._binding._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._binding._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._binding._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._binding._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 TestOpenSSLCreateX509CSR(object): |
| @pytest.mark.skipif( |
| backend._lib.OPENSSL_VERSION_NUMBER >= 0x10001000, |
| reason="Requires an older OpenSSL. Must be < 1.0.1" |
| ) |
| def test_unsupported_dsa_keys(self): |
| private_key = DSA_KEY_2048.private_key(backend) |
| |
| with pytest.raises(NotImplementedError): |
| backend.create_x509_csr(object(), private_key, hashes.SHA1()) |
| |
| @pytest.mark.skipif( |
| backend._lib.OPENSSL_VERSION_NUMBER >= 0x10001000, |
| reason="Requires an older OpenSSL. Must be < 1.0.1" |
| ) |
| def test_unsupported_ec_keys(self): |
| _skip_curve_unsupported(backend, ec.SECP256R1()) |
| private_key = ec.generate_private_key(ec.SECP256R1(), backend) |
| |
| with pytest.raises(NotImplementedError): |
| backend.create_x509_csr(object(), private_key, hashes.SHA1()) |
| |
| |
| class TestOpenSSLSignX509Certificate(object): |
| def test_requires_certificate_builder(self): |
| private_key = RSA_KEY_2048.private_key(backend) |
| |
| with pytest.raises(TypeError): |
| backend.create_x509_certificate(object(), private_key, DummyHash()) |
| |
| |
| 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 DummyLibrary(object): |
| Cryptography_HAS_EC = 0 |
| |
| |
| class TestOpenSSLEllipticCurve(object): |
| def test_elliptic_curve_supported(self, monkeypatch): |
| monkeypatch.setattr(backend, "_lib", DummyLibrary()) |
| |
| assert backend.elliptic_curve_supported(None) is False |
| |
| def test_elliptic_curve_signature_algorithm_supported(self, monkeypatch): |
| monkeypatch.setattr(backend, "_lib", DummyLibrary()) |
| |
| 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") |
| |
| |
| @pytest.mark.requires_backend_interface(interface=RSABackend) |
| class TestRSAPEMSerialization(object): |
| def test_password_length_limit(self): |
| password = b"x" * 1024 |
| key = RSA_KEY_2048.private_key(backend) |
| with pytest.raises(ValueError): |
| key.private_bytes( |
| serialization.Encoding.PEM, |
| serialization.PrivateFormat.PKCS8, |
| serialization.BestAvailableEncryption(password) |
| ) |