File gnutls-Make-XTS-key-check-failure-not-fatal.patch of Package gnutls.26615
From 00fff0aad2b606801704046042aa3b2b24f07d63 Mon Sep 17 00:00:00 2001
From: Zoltan Fridrich <zfridric@redhat.com>
Date: Thu, 29 Sep 2022 15:31:28 +0200
Subject: [PATCH] Make XTS key check failure not fatal
Signed-off-by: Zoltan Fridrich <zfridric@redhat.com>
---
lib/accelerated/x86/aes-xts-x86-aesni.c | 1
lib/nettle/cipher.c | 73 +++++++++--------------------
tests/Makefile.am | 2
tests/xts-key-check.c | 78 ++++++++++++++++++++++++++++++++
4 files changed, 102 insertions(+), 52 deletions(-)
create mode 100644 tests/xts-key-check.c
--- a/lib/accelerated/x86/aes-xts-x86-aesni.c
+++ b/lib/accelerated/x86/aes-xts-x86-aesni.c
@@ -73,7 +73,6 @@ x86_aes_xts_cipher_setkey(void *_ctx, co
/* Check key block according to FIPS-140-2 IG A.9 */
if (_gnutls_fips_mode_enabled()){
if (gnutls_memcmp(key, key + (keysize / 2), keysize / 2) == 0) {
- _gnutls_switch_lib_state(LIB_STATE_ERROR);
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
}
--- a/lib/nettle/cipher.c
+++ b/lib/nettle/cipher.c
@@ -432,12 +432,14 @@ _gcm_decrypt(struct nettle_cipher_ctx *c
length, dst, src);
}
-static void _des_set_key(struct des_ctx *ctx, const uint8_t *key)
+static void
+_des_set_key(struct des_ctx *ctx, const uint8_t *key)
{
des_set_key(ctx, key);
}
-static void _des3_set_key(struct des3_ctx *ctx, const uint8_t *key)
+static void
+_des3_set_key(struct des3_ctx *ctx, const uint8_t *key)
{
des3_set_key(ctx, key);
}
@@ -461,50 +463,6 @@ _cfb8_decrypt(struct nettle_cipher_ctx *
}
static void
-_xts_aes128_set_encrypt_key(struct xts_aes128_key *xts_key,
- const uint8_t *key)
-{
- if (_gnutls_fips_mode_enabled() &&
- gnutls_memcmp(key, key + AES128_KEY_SIZE, AES128_KEY_SIZE) == 0)
- _gnutls_switch_lib_state(LIB_STATE_ERROR);
-
- xts_aes128_set_encrypt_key(xts_key, key);
-}
-
-static void
-_xts_aes128_set_decrypt_key(struct xts_aes128_key *xts_key,
- const uint8_t *key)
-{
- if (_gnutls_fips_mode_enabled() &&
- gnutls_memcmp(key, key + AES128_KEY_SIZE, AES128_KEY_SIZE) == 0)
- _gnutls_switch_lib_state(LIB_STATE_ERROR);
-
- xts_aes128_set_decrypt_key(xts_key, key);
-}
-
-static void
-_xts_aes256_set_encrypt_key(struct xts_aes256_key *xts_key,
- const uint8_t *key)
-{
- if (_gnutls_fips_mode_enabled() &&
- gnutls_memcmp(key, key + AES256_KEY_SIZE, AES256_KEY_SIZE) == 0)
- _gnutls_switch_lib_state(LIB_STATE_ERROR);
-
- xts_aes256_set_encrypt_key(xts_key, key);
-}
-
-static void
-_xts_aes256_set_decrypt_key(struct xts_aes256_key *xts_key,
- const uint8_t *key)
-{
- if (_gnutls_fips_mode_enabled() &&
- gnutls_memcmp(key, key + AES256_KEY_SIZE, AES256_KEY_SIZE) == 0)
- _gnutls_switch_lib_state(LIB_STATE_ERROR);
-
- xts_aes256_set_decrypt_key(xts_key, key);
-}
-
-static void
_xts_aes128_encrypt(struct nettle_cipher_ctx *ctx, size_t length, uint8_t * dst,
const uint8_t * src)
{
@@ -1025,8 +983,8 @@ static const struct nettle_cipher_st bui
.ctx_size = sizeof(struct xts_aes128_key),
.encrypt = _xts_aes128_encrypt,
.decrypt = _xts_aes128_decrypt,
- .set_encrypt_key = (nettle_set_key_func*)_xts_aes128_set_encrypt_key,
- .set_decrypt_key = (nettle_set_key_func*)_xts_aes128_set_decrypt_key,
+ .set_encrypt_key = (nettle_set_key_func*)xts_aes128_set_encrypt_key,
+ .set_decrypt_key = (nettle_set_key_func*)xts_aes128_set_decrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_256_XTS,
@@ -1036,8 +994,8 @@ static const struct nettle_cipher_st bui
.ctx_size = sizeof(struct xts_aes256_key),
.encrypt = _xts_aes256_encrypt,
.decrypt = _xts_aes256_decrypt,
- .set_encrypt_key = (nettle_set_key_func*)_xts_aes256_set_encrypt_key,
- .set_decrypt_key = (nettle_set_key_func*)_xts_aes256_set_decrypt_key,
+ .set_encrypt_key = (nettle_set_key_func*)xts_aes256_set_encrypt_key,
+ .set_decrypt_key = (nettle_set_key_func*)xts_aes256_set_decrypt_key,
.max_iv_size = AES_BLOCK_SIZE,
},
{ .algo = GNUTLS_CIPHER_AES_128_SIV,
@@ -1128,6 +1086,21 @@ wrap_nettle_cipher_setkey(void *_ctx, co
return 0;
}
+ switch (ctx->cipher->algo) {
+ case GNUTLS_CIPHER_AES_128_XTS:
+ if (_gnutls_fips_mode_enabled() &&
+ gnutls_memcmp(key, (char *)key + AES128_KEY_SIZE, AES128_KEY_SIZE) == 0)
+ return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
+ break;
+ case GNUTLS_CIPHER_AES_256_XTS:
+ if (_gnutls_fips_mode_enabled() &&
+ gnutls_memcmp(key, (char *)key + AES256_KEY_SIZE, AES256_KEY_SIZE) == 0)
+ return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
+ break;
+ default:
+ break;
+ }
+
if (ctx->enc)
ctx->cipher->set_encrypt_key(ctx->ctx_ptr, key);
else
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -229,7 +229,7 @@ ctests += mini-record-2 simple gnutls_hm
sign-verify-newapi sign-verify-deterministic iov aead-cipher-vec \
tls13-without-timeout-func buffer status-request-revoked \
set_x509_ocsp_multi_cli kdf-api keylog-func handshake-write \
- x509cert-dntypes id-on-xmppAddr tls13-compat-mode \
+ x509cert-dntypes id-on-xmppAddr tls13-compat-mode xts-key-check \
pkcs7-verify-double-free
--- /dev/null
+++ b/tests/xts-key-check.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2022 Red Hat, Inc.
+ *
+ * Author: Zoltan Fridrich
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuTLS is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GnuTLS. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gnutls/crypto.h>
+
+#include "utils.h"
+
+static void test_xts_check(gnutls_cipher_algorithm_t alg)
+{
+ int ret;
+ gnutls_cipher_hd_t ctx;
+ gnutls_datum_t key, iv;
+
+ iv.size = gnutls_cipher_get_iv_size(alg);
+ iv.data = gnutls_malloc(iv.size);
+ if (iv.data == NULL)
+ fail("Error: %s\n", gnutls_strerror(GNUTLS_E_MEMORY_ERROR));
+ gnutls_memset(iv.data, 0xf0, iv.size);
+
+ key.size = gnutls_cipher_get_key_size(alg);
+ key.data = gnutls_malloc(key.size);
+ if (key.data == NULL) {
+ gnutls_free(iv.data);
+ fail("Error: %s\n", gnutls_strerror(GNUTLS_E_MEMORY_ERROR));
+ }
+ gnutls_memset(key.data, 0xf0, key.size);
+
+ ret = gnutls_cipher_init(&ctx, alg, &key, &iv);
+ if (ret == GNUTLS_E_SUCCESS) {
+ gnutls_cipher_deinit(ctx);
+ gnutls_free(iv.data);
+ gnutls_free(key.data);
+ fail("cipher initialization should fail for key1 == key2\n");
+ }
+
+ key.data[0] = 0xff;
+
+ ret = gnutls_cipher_init(&ctx, alg, &key, &iv);
+ gnutls_free(iv.data);
+ gnutls_free(key.data);
+
+ if (ret == GNUTLS_E_SUCCESS)
+ gnutls_cipher_deinit(ctx);
+ else
+ fail("cipher initialization should succeed with key1 != key2"
+ "\n%s\n", gnutls_strerror(ret));
+}
+
+void doit(void)
+{
+ if (!gnutls_fips140_mode_enabled())
+ exit(77);
+
+ test_xts_check(GNUTLS_CIPHER_AES_128_XTS);
+ test_xts_check(GNUTLS_CIPHER_AES_256_XTS);
+}
