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Add block cipher API with automatic padding

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Resolves: rhbz#2084161

Signed-off-by: Zoltan Fridrich <zfridric@redhat.com>
This commit is contained in:
Zoltan Fridrich 2022-11-15 14:19:07 +01:00
parent 2adea0884d
commit ec0dad9c1f
2 changed files with 435 additions and 0 deletions
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433
gnutls-3.7.7-aes-cbc-padding-support.patch Normal file
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@ -0,0 +1,433 @@
diff --color -ruNp a/doc/Makefile.am b/doc/Makefile.am
--- a/doc/Makefile.am 2022-11-15 14:14:10.632725399 +0100
+++ b/doc/Makefile.am 2022-11-15 14:14:40.252300863 +0100
@@ -575,6 +575,7 @@ ENUMS += enums/gnutls_certificate_verifi
ENUMS += enums/gnutls_certificate_verify_flags
ENUMS += enums/gnutls_channel_binding_t
ENUMS += enums/gnutls_cipher_algorithm_t
+ENUMS += enums/gnutls_cipher_flags_t
ENUMS += enums/gnutls_close_request_t
ENUMS += enums/gnutls_compression_method_t
ENUMS += enums/gnutls_credentials_type_t
@@ -882,12 +883,16 @@ FUNCS += functions/gnutls_cipher_decrypt
FUNCS += functions/gnutls_cipher_decrypt.short
FUNCS += functions/gnutls_cipher_decrypt2
FUNCS += functions/gnutls_cipher_decrypt2.short
+FUNCS += functions/gnutls_cipher_decrypt3
+FUNCS += functions/gnutls_cipher_decrypt3.short
FUNCS += functions/gnutls_cipher_deinit
FUNCS += functions/gnutls_cipher_deinit.short
FUNCS += functions/gnutls_cipher_encrypt
FUNCS += functions/gnutls_cipher_encrypt.short
FUNCS += functions/gnutls_cipher_encrypt2
FUNCS += functions/gnutls_cipher_encrypt2.short
+FUNCS += functions/gnutls_cipher_encrypt3
+FUNCS += functions/gnutls_cipher_encrypt3.short
FUNCS += functions/gnutls_cipher_get
FUNCS += functions/gnutls_cipher_get.short
FUNCS += functions/gnutls_cipher_get_block_size
diff --color -ruNp a/doc/manpages/Makefile.am b/doc/manpages/Makefile.am
--- a/doc/manpages/Makefile.am 2022-11-15 14:14:10.634725438 +0100
+++ b/doc/manpages/Makefile.am 2022-11-15 14:14:40.254300902 +0100
@@ -273,9 +273,11 @@ APIMANS += gnutls_check_version.3
APIMANS += gnutls_cipher_add_auth.3
APIMANS += gnutls_cipher_decrypt.3
APIMANS += gnutls_cipher_decrypt2.3
+APIMANS += gnutls_cipher_decrypt3.3
APIMANS += gnutls_cipher_deinit.3
APIMANS += gnutls_cipher_encrypt.3
APIMANS += gnutls_cipher_encrypt2.3
+APIMANS += gnutls_cipher_encrypt3.3
APIMANS += gnutls_cipher_get.3
APIMANS += gnutls_cipher_get_block_size.3
APIMANS += gnutls_cipher_get_id.3
diff --color -ruNp a/lib/crypto-api.c b/lib/crypto-api.c
--- a/lib/crypto-api.c 2022-11-15 14:14:11.036733248 +0100
+++ b/lib/crypto-api.c 2022-11-15 14:14:40.255300921 +0100
@@ -413,6 +413,166 @@ gnutls_cipher_decrypt2(gnutls_cipher_hd_
}
/**
+ * gnutls_cipher_encrypt3:
+ * @handle: is a #gnutls_cipher_hd_t type
+ * @ptext: the data to encrypt
+ * @ptext_len: the length of data to encrypt
+ * @ctext: the encrypted data
+ * @ctext_len: the length of encrypted data (initially must hold the maximum available size)
+ * @flags: flags for padding
+ *
+ * This function will encrypt the given data using the algorithm
+ * specified by the context. For block ciphers, @ptext_len is
+ * typically a multiple of the block size. If not, the caller can
+ * instruct the function to pad the last block according to @flags.
+ * Currently, the only available padding scheme is
+ * %GNUTLS_CIPHER_PADDING_PKCS7.
+ *
+ * If @ctext is not %NULL, it must hold enough space to store
+ * resulting cipher text. To check the required size, this function
+ * can be called with @ctext set to %NULL. Then @ctext_len will be
+ * updated without performing actual encryption.
+ *
+ * Returns: Zero or a negative error code on error.
+ *
+ * Since: 3.7.7
+ **/
+int
+gnutls_cipher_encrypt3(gnutls_cipher_hd_t handle,
+ const void *ptext, size_t ptext_len,
+ void *ctext, size_t *ctext_len,
+ unsigned flags)
+{
+ api_cipher_hd_st *h = handle;
+ const cipher_entry_st *e = h->ctx_enc.e;
+ int block_size = _gnutls_cipher_get_block_size(e);
+ int ret = 0;
+
+ if (unlikely(ctext_len == NULL)) {
+ return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
+ }
+
+ if (_gnutls_cipher_type(e) == CIPHER_BLOCK &&
+ (flags & GNUTLS_CIPHER_PADDING_PKCS7)) {
+ size_t n, r;
+ uint8_t last_block[MAX_CIPHER_BLOCK_SIZE];
+ const uint8_t *p = ptext;
+ uint8_t *c = ctext;
+
+ if (!INT_ADD_OK(ptext_len, block_size, &n)) {
+ return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
+ }
+
+ n = (n / block_size) * block_size;
+
+ if (!ctext) {
+ *ctext_len = n;
+ return 0;
+ }
+
+ if (*ctext_len < n) {
+ return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
+ }
+
+ /* Encrypt up to the last complete block */
+ r = ptext_len % block_size;
+
+ ret = _gnutls_cipher_encrypt2(&h->ctx_enc,
+ ptext, ptext_len - r,
+ ctext, ptext_len - r);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Encrypt the last block with padding */
+ gnutls_memset(last_block, block_size - r, sizeof(last_block));
+ if (r > 0) {
+ memcpy(last_block, &p[ptext_len - r], r);
+ }
+ ret = _gnutls_cipher_encrypt2(&h->ctx_enc,
+ last_block, block_size,
+ &c[ptext_len - r], block_size);
+ if (ret < 0) {
+ goto error;
+ }
+ *ctext_len = n;
+ } else {
+ if (!ctext) {
+ *ctext_len = ptext_len;
+ return 0;
+ }
+
+ ret = _gnutls_cipher_encrypt2(&h->ctx_enc, ptext, ptext_len,
+ ctext, *ctext_len);
+ if (ret < 0) {
+ goto error;
+ }
+ *ctext_len = ptext_len;
+ }
+
+ error:
+ if (ret < 0) {
+ _gnutls_switch_fips_state(GNUTLS_FIPS140_OP_ERROR);
+ } else {
+ _gnutls_switch_fips_state(GNUTLS_FIPS140_OP_APPROVED);
+ }
+ return ret;
+}
+
+/**
+ * gnutls_cipher_decrypt3:
+ * @handle: is a #gnutls_cipher_hd_t type
+ * @ctext: the data to decrypt
+ * @ctext_len: the length of data to decrypt
+ * @ptext: the decrypted data
+ * @ptext_len: the available length for decrypted data
+ * @flags: flags for padding
+ *
+ * This function will decrypt the given data using the algorithm
+ * specified by the context. If @flags is specified, padding for the
+ * decrypted data will be removed accordingly and @ptext_len will be
+ * updated.
+ *
+ * Returns: Zero or a negative error code on error.
+ *
+ * Since: 3.7.7
+ **/
+int
+gnutls_cipher_decrypt3(gnutls_cipher_hd_t handle,
+ const void *ctext, size_t ctext_len,
+ void *ptext, size_t *ptext_len,
+ unsigned flags)
+{
+ api_cipher_hd_st *h = handle;
+ int ret;
+
+ ret = gnutls_cipher_decrypt2(handle,
+ ctext, ctext_len,
+ ptext, *ptext_len);
+ if (ret < 0) {
+ return ret;
+ }
+
+ if (_gnutls_cipher_type(h->ctx_enc.e) == CIPHER_BLOCK &&
+ (flags & GNUTLS_CIPHER_PADDING_PKCS7)) {
+ uint8_t *p = ptext;
+ uint8_t padding = p[*ptext_len - 1];
+ if (!padding || padding > _gnutls_cipher_get_block_size(h->ctx_enc.e)) {
+ return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
+ }
+ /* Check that the prior bytes are all PADDING */
+ for (size_t i = *ptext_len - padding; i < *ptext_len; i++) {
+ if (padding != p[*ptext_len - 1]) {
+ return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
+ }
+ }
+ *ptext_len -= padding;
+ }
+
+ return 0;
+}
+
+/**
* gnutls_cipher_deinit:
* @handle: is a #gnutls_cipher_hd_t type
*
diff --color -ruNp a/lib/includes/gnutls/crypto.h b/lib/includes/gnutls/crypto.h
--- a/lib/includes/gnutls/crypto.h 2022-05-10 13:57:43.000000000 +0200
+++ b/lib/includes/gnutls/crypto.h 2022-11-15 14:14:40.256300941 +0100
@@ -49,6 +49,28 @@ int gnutls_cipher_encrypt2(gnutls_cipher
const void *text, size_t textlen,
void *ciphertext, size_t ciphertextlen);
+/**
+ * gnutls_cipher_flags_t:
+ * @GNUTLS_CIPHER_PADDING_PKCS7: Flag to indicate PKCS#7 padding
+ *
+ * Enumeration of flags to control block cipher padding, used by
+ * gnutls_cipher_encrypt3() and gnutls_cipher_decrypt3().
+ *
+ * Since: 3.7.7
+ */
+typedef enum gnutls_cipher_flags_t {
+ GNUTLS_CIPHER_PADDING_PKCS7 = 1
+} gnutls_cipher_flags_t;
+
+int gnutls_cipher_encrypt3(gnutls_cipher_hd_t handle,
+ const void *ptext, size_t ptext_len,
+ void *ctext, size_t *ctext_len,
+ unsigned flags);
+int gnutls_cipher_decrypt3(gnutls_cipher_hd_t handle,
+ const void *ctext, size_t ctext_len,
+ void *ptext, size_t *ptext_len,
+ unsigned flags);
+
void gnutls_cipher_set_iv(gnutls_cipher_hd_t handle, void *iv,
size_t ivlen);
diff --color -ruNp a/lib/libgnutls.map b/lib/libgnutls.map
--- a/lib/libgnutls.map 2022-11-15 14:14:11.142735308 +0100
+++ b/lib/libgnutls.map 2022-11-15 14:14:40.256300941 +0100
@@ -1403,6 +1403,8 @@ GNUTLS_3_7_7
{
global:
gnutls_fips140_run_self_tests;
+ gnutls_cipher_encrypt3;
+ gnutls_cipher_decrypt3;
local:
*;
} GNUTLS_3_7_5;
diff --color -ruNp a/tests/cipher-padding.c b/tests/cipher-padding.c
--- a/tests/cipher-padding.c 1970-01-01 01:00:00.000000000 +0100
+++ b/tests/cipher-padding.c 2022-11-15 14:14:40.258300980 +0100
@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2022 Red Hat, Inc.
+ *
+ * Author: Daiki Ueno
+ *
+ * This file is part of GnuTLS.
+ *
+ * The GnuTLS is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>
+ *
+ */
+
+#include <config.h>
+
+#include <gnutls/crypto.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdio.h>
+#include "utils.h"
+
+static void tls_log_func(int level, const char *str)
+{
+ fprintf(stderr, "<%d>| %s", level, str);
+}
+
+#define CLAMP(x, b) (((x) + (b)) / (b)) * (b)
+
+static void
+start(gnutls_cipher_algorithm_t algo, size_t plaintext_size, unsigned int flags)
+{
+ int ret;
+ gnutls_cipher_hd_t ch;
+ uint8_t key16[64];
+ uint8_t iv16[32];
+ uint8_t plaintext[128];
+ uint8_t ciphertext[128];
+ size_t block_size;
+ size_t size;
+ gnutls_datum_t key, iv;
+
+ success("%s %zu %u\n",
+ gnutls_cipher_get_name(algo), plaintext_size, flags);
+
+ block_size = gnutls_cipher_get_block_size(algo);
+
+ key.data = key16;
+ key.size = gnutls_cipher_get_key_size(algo);
+ assert(key.size <= sizeof(key16));
+
+ iv.data = iv16;
+ iv.size = gnutls_cipher_get_iv_size(algo);
+ assert(iv.size <= sizeof(iv16));
+
+ memset(iv.data, 0xff, iv.size);
+ memset(key.data, 0xfe, key.size);
+ memset(plaintext, 0xfa, sizeof(plaintext));
+
+ ret = gnutls_cipher_init(&ch, algo, &key, &iv);
+ if (ret < 0) {
+ fail("gnutls_cipher_init failed\n");
+ }
+
+ /* Check overflow if PKCS#7 is requested */
+ if (flags & GNUTLS_CIPHER_PADDING_PKCS7) {
+ ret = gnutls_cipher_encrypt3(ch,
+ plaintext, SIZE_MAX,
+ NULL, &size,
+ flags);
+ if (ret != GNUTLS_E_INVALID_REQUEST) {
+ fail("gnutls_cipher_encrypt3 succeeded\n");
+ }
+ }
+
+ /* Get the ciphertext size */
+ ret = gnutls_cipher_encrypt3(ch,
+ plaintext, plaintext_size,
+ NULL, &size,
+ flags);
+ if (ret < 0) {
+ fail("gnutls_cipher_encrypt3 failed\n");
+ }
+
+ if (flags & GNUTLS_CIPHER_PADDING_PKCS7) {
+ if (size <= plaintext_size) {
+ fail("no padding appended\n");
+ }
+ if (size != CLAMP(plaintext_size, block_size)) {
+ fail("size does not match: %zu (expected %zu)\n",
+ size, CLAMP(plaintext_size, block_size));
+ }
+ } else {
+ if (size != plaintext_size) {
+ fail("size does not match: %zu (expected %zu)\n",
+ size, plaintext_size);
+ }
+ }
+
+ /* Encrypt with padding */
+ ret = gnutls_cipher_encrypt3(ch,
+ plaintext, plaintext_size,
+ ciphertext, &size,
+ flags);
+ if (ret < 0) {
+ fail("gnutls_cipher_encrypt3 failed\n");
+ }
+
+ /* Decrypt with padding */
+ ret = gnutls_cipher_decrypt3(ch,
+ ciphertext, size,
+ ciphertext, &size,
+ flags);
+ if (ret < 0) {
+ fail("gnutls_cipher_encrypt3 failed\n");
+ }
+
+ if (size != plaintext_size) {
+ fail("size does not match: %zu (expected %zu)\n",
+ size, plaintext_size);
+ }
+
+ if (memcmp(ciphertext, plaintext, size) != 0) {
+ fail("plaintext does not match\n");
+ }
+
+ gnutls_cipher_deinit(ch);
+}
+
+void doit(void) {
+ int ret;
+
+ gnutls_global_set_log_function(tls_log_func);
+ if (debug) {
+ gnutls_global_set_log_level(4711);
+ }
+
+ ret = global_init();
+ if (ret < 0) {
+ fail("Cannot initialize library\n");
+ }
+
+ start(GNUTLS_CIPHER_AES_128_CBC, 0, GNUTLS_CIPHER_PADDING_PKCS7);
+ start(GNUTLS_CIPHER_AES_128_CBC, 11, GNUTLS_CIPHER_PADDING_PKCS7);
+ start(GNUTLS_CIPHER_AES_128_CBC, 77, GNUTLS_CIPHER_PADDING_PKCS7);
+ start(GNUTLS_CIPHER_AES_128_CBC, 80, GNUTLS_CIPHER_PADDING_PKCS7);
+
+ start(GNUTLS_CIPHER_AES_128_CBC, 0, 0);
+ start(GNUTLS_CIPHER_AES_128_CBC, 80, 0);
+
+ gnutls_global_deinit();
+}
diff --color -ruNp a/tests/Makefile.am b/tests/Makefile.am
--- a/tests/Makefile.am 2022-11-15 14:14:11.144735347 +0100
+++ b/tests/Makefile.am 2022-11-15 14:14:40.257300960 +0100
@@ -233,7 +233,7 @@ ctests += mini-record-2 simple gnutls_hm
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 ciphersuite-name \
- x509-upnconstraint xts-key-check pkcs7-verify-double-free \
+ x509-upnconstraint cipher-padding xts-key-check pkcs7-verify-double-free \
fips-rsa-sizes tls12-rehandshake-ticket
ctests += tls-channel-binding

2
gnutls.spec
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@ -32,6 +32,7 @@ Patch: gnutls-3.7.6-fips-symkey-limit.patch
Patch: gnutls-3.7.6-fips-ecdsa-hash-check.patch
Patch: gnutls-3.7.8-xts-key-check.patch
Patch: gnutls-3.7.8-clear-session-ticket.patch
Patch: gnutls-3.7.7-aes-cbc-padding-support.patch
# not upstreamed
Patch: gnutls-3.7.3-disable-config-reload.patch
@ -400,6 +401,7 @@ make check %{?_smp_mflags} GNUTLS_SYSTEM_PRIORITY_FILE=/dev/null
- fips: make XTS key check failure not fatal (#2130971)
- enable source archive verification again (#2127094)
- clear server's session ticket indication at rehandshake (#2136072)
- crypto-api: add block cipher API with automatic padding (#2084161)
* Tue Sep 27 2022 Daiki Ueno <dueno@redhat.com> - 3.7.6-12
- fips: mark PBKDF2 with short key and output sizes non-approved