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python-cryptography/0002-WIP-3.0.0-support-5250.patch
Christian Heimes 66d31f4f5f Add backports of OpenSSL 3.0.0 fixes (upstream PR #6000) 
Resolves: rhbz#1953446
2021-05-17 09:38:47 +02:00

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From a0bece343e38d73d038d4f3a62c2a9638608ac9c Mon Sep 17 00:00:00 2001
From: Paul Kehrer <paul.l.kehrer@gmail.com>
Date: Thu, 22 Apr 2021 19:16:38 -0500
Subject: [PATCH 2/3] [WIP] 3.0.0 support (#5250)
* 3.0.0 support
* almost...there...
* make mypy happy
---
.github/workflows/ci.yml | 7 ++--
src/_cffi_src/build_openssl.py | 1 +
src/_cffi_src/openssl/cryptography.py | 3 ++
src/_cffi_src/openssl/err.py | 6 +++
src/_cffi_src/openssl/fips.py | 2 +-
src/_cffi_src/openssl/provider.py | 40 ++++++++++++++++++
.../hazmat/backends/openssl/backend.py | 42 ++++++++++++++++---
.../hazmat/backends/openssl/ciphers.py | 15 ++++++-
.../hazmat/bindings/openssl/_conditional.py | 11 +++++
.../hazmat/bindings/openssl/binding.py | 20 +++++++++
tests/hazmat/backends/test_openssl_memleak.py | 6 ++-
tests/hazmat/bindings/test_openssl.py | 4 +-
tests/hazmat/primitives/test_dh.py | 24 ++++++++++-
13 files changed, 167 insertions(+), 14 deletions(-)
create mode 100644 src/_cffi_src/openssl/provider.py
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd967a3a..747f84c1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,9 +18,10 @@ jobs:
- {VERSION: "3.9", TOXENV: "flake,rust,docs", COVERAGE: "false"}
- {VERSION: "pypy3", TOXENV: "pypy3"}
- {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "openssl", VERSION: "1.1.0l"}}
- - {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "openssl", VERSION: "1.1.1i"}}
- - {VERSION: "3.9", TOXENV: "py39-ssh", OPENSSL: {TYPE: "openssl", VERSION: "1.1.1i"}}
- - {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "openssl", VERSION: "1.1.1i", CONFIG_FLAGS: "no-engine no-rc2 no-srtp no-ct"}}
+ - {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "openssl", VERSION: "1.1.1j"}}
+ - {VERSION: "3.9", TOXENV: "py39-ssh", OPENSSL: {TYPE: "openssl", VERSION: "1.1.1j"}}
+ - {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "openssl", VERSION: "1.1.1j", CONFIG_FLAGS: "no-engine no-rc2 no-srtp no-ct"}}
+ - {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "openssl", VERSION: "3.0.0-alpha15"}}
- {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "libressl", VERSION: "2.9.2"}}
- {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "libressl", VERSION: "3.0.2"}}
- {VERSION: "3.9", TOXENV: "py39", OPENSSL: {TYPE: "libressl", VERSION: "3.1.5"}}
diff --git a/src/_cffi_src/build_openssl.py b/src/_cffi_src/build_openssl.py
index 08499d66..557296ed 100644
--- a/src/_cffi_src/build_openssl.py
+++ b/src/_cffi_src/build_openssl.py
@@ -104,6 +104,7 @@ ffi = build_ffi_for_binding(
"osrandom_engine",
"pem",
"pkcs12",
+ "provider",
"rand",
"rsa",
"ssl",
diff --git a/src/_cffi_src/openssl/cryptography.py b/src/_cffi_src/openssl/cryptography.py
index e2b5a132..06d1e778 100644
--- a/src/_cffi_src/openssl/cryptography.py
+++ b/src/_cffi_src/openssl/cryptography.py
@@ -34,6 +34,8 @@ INCLUDES = """
#define CRYPTOGRAPHY_OPENSSL_110F_OR_GREATER \
(OPENSSL_VERSION_NUMBER >= 0x1010006f && !CRYPTOGRAPHY_IS_LIBRESSL)
+#define CRYPTOGRAPHY_OPENSSL_300_OR_GREATER \
+ (OPENSSL_VERSION_NUMBER >= 0x30000000 && !CRYPTOGRAPHY_IS_LIBRESSL)
#define CRYPTOGRAPHY_OPENSSL_LESS_THAN_110J \
(OPENSSL_VERSION_NUMBER < 0x101000af || CRYPTOGRAPHY_IS_LIBRESSL)
@@ -53,6 +55,7 @@ INCLUDES = """
TYPES = """
static const int CRYPTOGRAPHY_OPENSSL_110F_OR_GREATER;
+static const int CRYPTOGRAPHY_OPENSSL_300_OR_GREATER;
static const int CRYPTOGRAPHY_OPENSSL_LESS_THAN_111;
static const int CRYPTOGRAPHY_OPENSSL_LESS_THAN_111B;
diff --git a/src/_cffi_src/openssl/err.py b/src/_cffi_src/openssl/err.py
index 0634b656..8cfeaf5b 100644
--- a/src/_cffi_src/openssl/err.py
+++ b/src/_cffi_src/openssl/err.py
@@ -18,6 +18,7 @@ static const int EVP_R_UNKNOWN_PBE_ALGORITHM;
static const int ERR_LIB_EVP;
static const int ERR_LIB_PEM;
+static const int ERR_LIB_PROV;
static const int ERR_LIB_ASN1;
static const int ERR_LIB_PKCS12;
@@ -45,4 +46,9 @@ int ERR_GET_REASON(unsigned long);
"""
CUSTOMIZATIONS = """
+/* This define is tied to provider support and is conditionally
+ removed if Cryptography_HAS_PROVIDERS is false */
+#ifndef ERR_LIB_PROV
+#define ERR_LIB_PROV 0
+#endif
"""
diff --git a/src/_cffi_src/openssl/fips.py b/src/_cffi_src/openssl/fips.py
index b9d0d64d..23c10af9 100644
--- a/src/_cffi_src/openssl/fips.py
+++ b/src/_cffi_src/openssl/fips.py
@@ -17,7 +17,7 @@ int FIPS_mode(void);
"""
CUSTOMIZATIONS = """
-#if CRYPTOGRAPHY_IS_LIBRESSL
+#if CRYPTOGRAPHY_IS_LIBRESSL || CRYPTOGRAPHY_OPENSSL_300_OR_GREATER
static const long Cryptography_HAS_FIPS = 0;
int (*FIPS_mode_set)(int) = NULL;
int (*FIPS_mode)(void) = NULL;
diff --git a/src/_cffi_src/openssl/provider.py b/src/_cffi_src/openssl/provider.py
new file mode 100644
index 00000000..d7d659ea
--- /dev/null
+++ b/src/_cffi_src/openssl/provider.py
@@ -0,0 +1,40 @@
+# 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.
+
+
+INCLUDES = """
+#if CRYPTOGRAPHY_OPENSSL_300_OR_GREATER
+#include <openssl/provider.h>
+#include <openssl/proverr.h>
+#endif
+"""
+
+TYPES = """
+static const long Cryptography_HAS_PROVIDERS;
+
+typedef ... OSSL_PROVIDER;
+typedef ... OSSL_LIB_CTX;
+
+static const long PROV_R_BAD_DECRYPT;
+static const long PROV_R_WRONG_FINAL_BLOCK_LENGTH;
+"""
+
+FUNCTIONS = """
+OSSL_PROVIDER *OSSL_PROVIDER_load(OSSL_LIB_CTX *, const char *);
+int OSSL_PROVIDER_unload(OSSL_PROVIDER *prov);
+"""
+
+CUSTOMIZATIONS = """
+#if CRYPTOGRAPHY_OPENSSL_300_OR_GREATER
+static const long Cryptography_HAS_PROVIDERS = 1;
+#else
+static const long Cryptography_HAS_PROVIDERS = 0;
+typedef void OSSL_PROVIDER;
+typedef void OSSL_LIB_CTX;
+static const long PROV_R_BAD_DECRYPT = 0;
+static const long PROV_R_WRONG_FINAL_BLOCK_LENGTH = 0;
+OSSL_PROVIDER *(*OSSL_PROVIDER_load)(OSSL_LIB_CTX *, const char *) = NULL;
+int (*OSSL_PROVIDER_unload)(OSSL_PROVIDER *) = NULL;
+#endif
+"""
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index a96d08d8..86e8f0a8 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -1281,6 +1281,11 @@ class Backend(object):
def _evp_pkey_from_der_traditional_key(self, bio_data, password):
key = self._lib.d2i_PrivateKey_bio(bio_data.bio, self._ffi.NULL)
if key != self._ffi.NULL:
+ # In OpenSSL 3.0.0-alpha15 there exist scenarios where the key will
+ # successfully load but errors are still put on the stack. Tracked
+ # as https://github.com/openssl/openssl/issues/14996
+ self._consume_errors()
+
key = self._ffi.gc(key, self._lib.EVP_PKEY_free)
if password is not None:
raise TypeError(
@@ -1448,6 +1453,11 @@ class Backend(object):
else:
self._handle_key_loading_error()
+ # In OpenSSL 3.0.0-alpha15 there exist scenarios where the key will
+ # successfully load but errors are still put on the stack. Tracked
+ # as https://github.com/openssl/openssl/issues/14996
+ self._consume_errors()
+
evp_pkey = self._ffi.gc(evp_pkey, self._lib.EVP_PKEY_free)
if password is not None and userdata.called == 0:
@@ -1470,11 +1480,22 @@ class Backend(object):
"incorrect format or it may be encrypted with an unsupported "
"algorithm."
)
- elif errors[0]._lib_reason_match(
- self._lib.ERR_LIB_EVP, self._lib.EVP_R_BAD_DECRYPT
- ) or errors[0]._lib_reason_match(
- self._lib.ERR_LIB_PKCS12,
- self._lib.PKCS12_R_PKCS12_CIPHERFINAL_ERROR,
+
+ elif (
+ errors[0]._lib_reason_match(
+ self._lib.ERR_LIB_EVP, self._lib.EVP_R_BAD_DECRYPT
+ )
+ or errors[0]._lib_reason_match(
+ self._lib.ERR_LIB_PKCS12,
+ self._lib.PKCS12_R_PKCS12_CIPHERFINAL_ERROR,
+ )
+ or (
+ self._lib.Cryptography_HAS_PROVIDERS
+ and errors[0]._lib_reason_match(
+ self._lib.ERR_LIB_PROV,
+ self._lib.PROV_R_BAD_DECRYPT,
+ )
+ )
):
raise ValueError("Bad decrypt. Incorrect password?")
@@ -2520,7 +2541,16 @@ class Backend(object):
if sk_x509_ptr[0] != self._ffi.NULL:
sk_x509 = self._ffi.gc(sk_x509_ptr[0], self._lib.sk_X509_free)
num = self._lib.sk_X509_num(sk_x509_ptr[0])
- for i in range(num):
+
+ # In OpenSSL < 3.0.0 PKCS12 parsing reverses the order of the
+ # certificates.
+ indices: typing.Iterable[int]
+ if self._lib.CRYPTOGRAPHY_OPENSSL_300_OR_GREATER:
+ indices = range(num)
+ else:
+ indices = reversed(range(num))
+
+ for i in indices:
x509 = self._lib.sk_X509_value(sk_x509, i)
self.openssl_assert(x509 != self._ffi.NULL)
x509 = self._ffi.gc(x509, self._lib.X509_free)
diff --git a/src/cryptography/hazmat/backends/openssl/ciphers.py b/src/cryptography/hazmat/backends/openssl/ciphers.py
index 0f96795f..a2dd6894 100644
--- a/src/cryptography/hazmat/backends/openssl/ciphers.py
+++ b/src/cryptography/hazmat/backends/openssl/ciphers.py
@@ -145,7 +145,13 @@ class _CipherContext(object):
res = self._backend._lib.EVP_CipherUpdate(
self._ctx, outbuf, outlen, inbuf, inlen
)
- self._backend.openssl_assert(res != 0)
+ if res == 0 and isinstance(self._mode, modes.XTS):
+ raise ValueError(
+ "In XTS mode you must supply at least a full block in the "
+ "first update call. For AES this is 16 bytes."
+ )
+ else:
+ self._backend.openssl_assert(res != 0)
data_processed += inlen
total_out += outlen[0]
@@ -174,6 +180,13 @@ class _CipherContext(object):
errors[0]._lib_reason_match(
self._backend._lib.ERR_LIB_EVP,
self._backend._lib.EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH,
+ )
+ or (
+ self._backend._lib.Cryptography_HAS_PROVIDERS
+ and errors[0]._lib_reason_match(
+ self._backend._lib.ERR_LIB_PROV,
+ self._backend._lib.PROV_R_WRONG_FINAL_BLOCK_LENGTH,
+ )
),
errors=errors,
)
diff --git a/src/cryptography/hazmat/bindings/openssl/_conditional.py b/src/cryptography/hazmat/bindings/openssl/_conditional.py
index 86548357..1f42c7be 100644
--- a/src/cryptography/hazmat/bindings/openssl/_conditional.py
+++ b/src/cryptography/hazmat/bindings/openssl/_conditional.py
@@ -270,6 +270,16 @@ def cryptography_has_get_proto_version():
]
+def cryptography_has_providers():
+ return [
+ "OSSL_PROVIDER_load",
+ "OSSL_PROVIDER_unload",
+ "ERR_LIB_PROV",
+ "PROV_R_WRONG_FINAL_BLOCK_LENGTH",
+ "PROV_R_BAD_DECRYPT",
+ ]
+
+
# This is a mapping of
# {condition: function-returning-names-dependent-on-that-condition} so we can
# loop over them and delete unsupported names at runtime. It will be removed
@@ -318,4 +328,5 @@ CONDITIONAL_NAMES = {
"Cryptography_HAS_VERIFIED_CHAIN": cryptography_has_verified_chain,
"Cryptography_HAS_SRTP": cryptography_has_srtp,
"Cryptography_HAS_GET_PROTO_VERSION": cryptography_has_get_proto_version,
+ "Cryptography_HAS_PROVIDERS": cryptography_has_providers,
}
diff --git a/src/cryptography/hazmat/bindings/openssl/binding.py b/src/cryptography/hazmat/bindings/openssl/binding.py
index a2bc36a8..6dcec26a 100644
--- a/src/cryptography/hazmat/bindings/openssl/binding.py
+++ b/src/cryptography/hazmat/bindings/openssl/binding.py
@@ -113,6 +113,8 @@ class Binding(object):
ffi = ffi
_lib_loaded = False
_init_lock = threading.Lock()
+ _legacy_provider: typing.Any = None
+ _default_provider: typing.Any = None
def __init__(self):
self._ensure_ffi_initialized()
@@ -140,6 +142,24 @@ class Binding(object):
# adds all ciphers/digests for EVP
cls.lib.OpenSSL_add_all_algorithms()
cls._register_osrandom_engine()
+ # As of OpenSSL 3.0.0 we must register a legacy cipher provider
+ # to get RC2 (needed for junk asymmetric private key
+ # serialization), RC4, Blowfish, IDEA, SEED, etc. These things
+ # are ugly legacy, but we aren't going to get rid of them
+ # any time soon.
+ if cls.lib.CRYPTOGRAPHY_OPENSSL_300_OR_GREATER:
+ cls._legacy_provider = cls.lib.OSSL_PROVIDER_load(
+ cls.ffi.NULL, b"legacy"
+ )
+ _openssl_assert(
+ cls.lib, cls._legacy_provider != cls.ffi.NULL
+ )
+ cls._default_provider = cls.lib.OSSL_PROVIDER_load(
+ cls.ffi.NULL, b"default"
+ )
+ _openssl_assert(
+ cls.lib, cls._default_provider != cls.ffi.NULL
+ )
@classmethod
def init_static_locks(cls):
diff --git a/tests/hazmat/backends/test_openssl_memleak.py b/tests/hazmat/backends/test_openssl_memleak.py
index 0c96516f..0316b5d9 100644
--- a/tests/hazmat/backends/test_openssl_memleak.py
+++ b/tests/hazmat/backends/test_openssl_memleak.py
@@ -82,7 +82,7 @@ def main(argv):
assert result == 1
# Trigger a bunch of initialization stuff.
- import cryptography.hazmat.backends.openssl
+ from cryptography.hazmat.backends.openssl.backend import backend
start_heap = set(heap)
@@ -91,6 +91,10 @@ def main(argv):
gc.collect()
gc.collect()
+ if lib.CRYPTOGRAPHY_OPENSSL_300_OR_GREATER:
+ lib.OSSL_PROVIDER_unload(backend._binding._legacy_provider)
+ lib.OSSL_PROVIDER_unload(backend._binding._default_provider)
+
if lib.Cryptography_HAS_OPENSSL_CLEANUP:
lib.OPENSSL_cleanup()
diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index fb9a1e36..4d1e3b55 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -91,7 +91,9 @@ class TestOpenSSL(object):
_openssl_assert(b.lib, False)
error = exc_info.value.err_code[0]
- assert error.code == 101183626
+ # As of 3.0.0 OpenSSL sets func codes to 0, so the combined
+ # code is a different value
+ assert error.code in (101183626, 50331786)
assert error.lib == b.lib.ERR_LIB_EVP
assert error.func == b.lib.EVP_F_EVP_ENCRYPTFINAL_EX
assert error.reason == b.lib.EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
diff --git a/tests/hazmat/primitives/test_dh.py b/tests/hazmat/primitives/test_dh.py
index 131807fc..bb29919f 100644
--- a/tests/hazmat/primitives/test_dh.py
+++ b/tests/hazmat/primitives/test_dh.py
@@ -180,7 +180,23 @@ class TestDH(object):
params = dh.DHParameterNumbers(p, int(vector["g"]))
param = params.parameters(backend)
key = param.generate_private_key()
- assert key.private_numbers().public_numbers.parameter_numbers == params
+ # In OpenSSL 3.0.0 OpenSSL maps to known groups. This results in
+ # a scenario where loading a known group with p and g returns a
+ # re-serialized form that has q as well (the Sophie Germain prime of
+ # that group). This makes a naive comparison of the parameter numbers
+ # objects fail, so we have to be a bit smarter
+ serialized_params = (
+ key.private_numbers().public_numbers.parameter_numbers
+ )
+ if serialized_params.q is None:
+ # This is the path OpenSSL < 3.0 takes
+ assert serialized_params == params
+ else:
+ assert serialized_params.p == params.p
+ assert serialized_params.g == params.g
+ # p = 2q + 1 since it is a Sophie Germain prime, so we can compute
+ # what we expect OpenSSL to have done here.
+ assert serialized_params.q == (params.p - 1) // 2
@pytest.mark.skip_fips(reason="non-FIPS parameters")
@pytest.mark.parametrize(
@@ -382,6 +398,12 @@ class TestDH(object):
assert symkey1 != symkey2
@pytest.mark.skip_fips(reason="key_size too small for FIPS")
+ @pytest.mark.supported(
+ only_if=lambda backend: (
+ not backend._lib.CRYPTOGRAPHY_OPENSSL_300_OR_GREATER
+ ),
+ skip_message="256-bit DH keys are not supported in OpenSSL 3.0.0+",
+ )
def test_load_256bit_key_from_pkcs8(self, backend):
data = load_vectors_from_file(
os.path.join("asymmetric", "DH", "dh_key_256.pem"),
--
2.30.2
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