2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
111 /* ====================================================================
112 * Copyright 2005 Nokia. All rights reserved.
114 * The portions of the attached software ("Contribution") is developed by
115 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
118 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
119 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
120 * support (see RFC 4279) to OpenSSL.
122 * No patent licenses or other rights except those expressly stated in
123 * the OpenSSL open source license shall be deemed granted or received
124 * expressly, by implication, estoppel, or otherwise.
126 * No assurances are provided by Nokia that the Contribution does not
127 * infringe the patent or other intellectual property rights of any third
128 * party or that the license provides you with all the necessary rights
129 * to make use of the Contribution.
131 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
132 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
133 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
134 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
139 #include "ssl_locl.h"
140 #include <openssl/evp.h>
141 #include <openssl/md5.h>
143 static const unsigned char ssl3_pad_1[48] = {
144 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
145 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
146 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
147 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
148 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
149 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36
152 static const unsigned char ssl3_pad_2[48] = {
153 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
154 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
155 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
156 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
157 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
158 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c
161 static int ssl3_handshake_mac(SSL *s, int md_nid,
162 const char *sender, int len, unsigned char *p);
163 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
167 unsigned char buf[16], smd[SHA_DIGEST_LENGTH];
168 unsigned char c = 'A';
169 unsigned int i, j, k;
171 #ifdef CHARSET_EBCDIC
172 c = os_toascii[c]; /* 'A' in ASCII */
175 EVP_MD_CTX_init(&m5);
176 EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
177 EVP_MD_CTX_init(&s1);
178 for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {
180 if (k > sizeof buf) {
181 /* bug: 'buf' is too small for this ciphersuite */
182 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
186 for (j = 0; j < k; j++)
189 EVP_DigestInit_ex(&s1, EVP_sha1(), NULL);
190 EVP_DigestUpdate(&s1, buf, k);
191 EVP_DigestUpdate(&s1, s->session->master_key,
192 s->session->master_key_length);
193 EVP_DigestUpdate(&s1, s->s3->server_random, SSL3_RANDOM_SIZE);
194 EVP_DigestUpdate(&s1, s->s3->client_random, SSL3_RANDOM_SIZE);
195 EVP_DigestFinal_ex(&s1, smd, NULL);
197 EVP_DigestInit_ex(&m5, EVP_md5(), NULL);
198 EVP_DigestUpdate(&m5, s->session->master_key,
199 s->session->master_key_length);
200 EVP_DigestUpdate(&m5, smd, SHA_DIGEST_LENGTH);
201 if ((int)(i + MD5_DIGEST_LENGTH) > num) {
202 EVP_DigestFinal_ex(&m5, smd, NULL);
203 memcpy(km, smd, (num - i));
205 EVP_DigestFinal_ex(&m5, km, NULL);
207 km += MD5_DIGEST_LENGTH;
209 OPENSSL_cleanse(smd, SHA_DIGEST_LENGTH);
210 EVP_MD_CTX_cleanup(&m5);
211 EVP_MD_CTX_cleanup(&s1);
215 int ssl3_change_cipher_state(SSL *s, int which)
217 unsigned char *p, *mac_secret;
218 unsigned char exp_key[EVP_MAX_KEY_LENGTH];
219 unsigned char exp_iv[EVP_MAX_IV_LENGTH];
220 unsigned char *ms, *key, *iv, *er1, *er2;
223 #ifndef OPENSSL_NO_COMP
228 int is_exp, n, i, j, k, cl;
231 is_exp = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
232 c = s->s3->tmp.new_sym_enc;
233 m = s->s3->tmp.new_hash;
234 /* m == NULL will lead to a crash later */
236 #ifndef OPENSSL_NO_COMP
237 if (s->s3->tmp.new_compression == NULL)
240 comp = s->s3->tmp.new_compression->method;
243 if (which & SSL3_CC_READ) {
244 if (s->enc_read_ctx != NULL)
246 else if ((s->enc_read_ctx =
247 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
251 * make sure it's intialized in case we exit later with an error
253 EVP_CIPHER_CTX_init(s->enc_read_ctx);
254 dd = s->enc_read_ctx;
256 ssl_replace_hash(&s->read_hash, m);
257 #ifndef OPENSSL_NO_COMP
259 if (s->expand != NULL) {
260 COMP_CTX_free(s->expand);
264 s->expand = COMP_CTX_new(comp);
265 if (s->expand == NULL) {
266 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
267 SSL_R_COMPRESSION_LIBRARY_ERROR);
270 if (s->s3->rrec.comp == NULL)
271 s->s3->rrec.comp = (unsigned char *)
272 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
273 if (s->s3->rrec.comp == NULL)
277 memset(&(s->s3->read_sequence[0]), 0, 8);
278 mac_secret = &(s->s3->read_mac_secret[0]);
280 if (s->enc_write_ctx != NULL)
282 else if ((s->enc_write_ctx =
283 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
287 * make sure it's intialized in case we exit later with an error
289 EVP_CIPHER_CTX_init(s->enc_write_ctx);
290 dd = s->enc_write_ctx;
291 ssl_replace_hash(&s->write_hash, m);
292 #ifndef OPENSSL_NO_COMP
294 if (s->compress != NULL) {
295 COMP_CTX_free(s->compress);
299 s->compress = COMP_CTX_new(comp);
300 if (s->compress == NULL) {
301 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
302 SSL_R_COMPRESSION_LIBRARY_ERROR);
307 memset(&(s->s3->write_sequence[0]), 0, 8);
308 mac_secret = &(s->s3->write_mac_secret[0]);
312 EVP_CIPHER_CTX_cleanup(dd);
314 p = s->s3->tmp.key_block;
318 cl = EVP_CIPHER_key_length(c);
319 j = is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
320 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
321 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
322 k = EVP_CIPHER_iv_length(c);
323 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
324 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
331 er1 = &(s->s3->client_random[0]);
332 er2 = &(s->s3->server_random[0]);
341 er1 = &(s->s3->server_random[0]);
342 er2 = &(s->s3->client_random[0]);
345 if (n > s->s3->tmp.key_block_length) {
346 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
350 EVP_MD_CTX_init(&md);
351 memcpy(mac_secret, ms, i);
354 * In here I set both the read and write key/iv to the same value
355 * since only the correct one will be used :-).
357 EVP_DigestInit_ex(&md, EVP_md5(), NULL);
358 EVP_DigestUpdate(&md, key, j);
359 EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE);
360 EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE);
361 EVP_DigestFinal_ex(&md, &(exp_key[0]), NULL);
365 EVP_DigestInit_ex(&md, EVP_md5(), NULL);
366 EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE);
367 EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE);
368 EVP_DigestFinal_ex(&md, &(exp_iv[0]), NULL);
373 EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE));
375 #ifdef OPENSSL_SSL_TRACE_CRYPTO
376 if (s->msg_callback) {
378 int wh = which & SSL3_CC_WRITE ?
379 TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
380 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
381 mac_secret, EVP_MD_size(m), s, s->msg_callback_arg);
383 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
384 key, c->key_len, s, s->msg_callback_arg);
386 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,
387 iv, k, s, s->msg_callback_arg);
392 OPENSSL_cleanse(&(exp_key[0]), sizeof(exp_key));
393 OPENSSL_cleanse(&(exp_iv[0]), sizeof(exp_iv));
394 EVP_MD_CTX_cleanup(&md);
397 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
402 int ssl3_setup_key_block(SSL *s)
411 if (s->s3->tmp.key_block_length != 0)
414 if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp, 0)) {
415 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
419 s->s3->tmp.new_sym_enc = c;
420 s->s3->tmp.new_hash = hash;
421 #ifdef OPENSSL_NO_COMP
422 s->s3->tmp.new_compression = NULL;
424 s->s3->tmp.new_compression = comp;
427 num = EVP_MD_size(hash);
431 num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c);
434 ssl3_cleanup_key_block(s);
436 if ((p = OPENSSL_malloc(num)) == NULL)
439 s->s3->tmp.key_block_length = num;
440 s->s3->tmp.key_block = p;
442 ret = ssl3_generate_key_block(s, p, num);
444 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
446 * enable vulnerability countermeasure for CBC ciphers with known-IV
447 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
449 s->s3->need_empty_fragments = 1;
451 if (s->session->cipher != NULL) {
452 if (s->session->cipher->algorithm_enc == SSL_eNULL)
453 s->s3->need_empty_fragments = 0;
455 #ifndef OPENSSL_NO_RC4
456 if (s->session->cipher->algorithm_enc == SSL_RC4)
457 s->s3->need_empty_fragments = 0;
465 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
469 void ssl3_cleanup_key_block(SSL *s)
471 if (s->s3->tmp.key_block != NULL) {
472 OPENSSL_cleanse(s->s3->tmp.key_block, s->s3->tmp.key_block_length);
473 OPENSSL_free(s->s3->tmp.key_block);
474 s->s3->tmp.key_block = NULL;
476 s->s3->tmp.key_block_length = 0;
480 * ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
483 * 0: (in non-constant time) if the record is publically invalid (i.e. too
485 * 1: if the record's padding is valid / the encryption was successful.
486 * -1: if the record's padding is invalid or, if sending, an internal error
489 int ssl3_enc(SSL *s, int send)
494 int bs, i, mac_size = 0;
495 const EVP_CIPHER *enc;
498 ds = s->enc_write_ctx;
499 rec = &(s->s3->wrec);
500 if (s->enc_write_ctx == NULL)
503 enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
505 ds = s->enc_read_ctx;
506 rec = &(s->s3->rrec);
507 if (s->enc_read_ctx == NULL)
510 enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
513 if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) {
514 memmove(rec->data, rec->input, rec->length);
515 rec->input = rec->data;
518 bs = EVP_CIPHER_block_size(ds->cipher);
522 if ((bs != 1) && send) {
523 i = bs - ((int)l % bs);
525 /* we need to add 'i-1' padding bytes */
528 * the last of these zero bytes will be overwritten with the
531 memset(&rec->input[rec->length], 0, i);
533 rec->input[l - 1] = (i - 1);
537 if (l == 0 || l % bs != 0)
539 /* otherwise, rec->length >= bs */
542 if (EVP_Cipher(ds, rec->data, rec->input, l) < 1)
545 if (EVP_MD_CTX_md(s->read_hash) != NULL)
546 mac_size = EVP_MD_CTX_size(s->read_hash);
547 if ((bs != 1) && !send)
548 return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
553 void ssl3_init_finished_mac(SSL *s)
555 if (s->s3->handshake_buffer)
556 BIO_free(s->s3->handshake_buffer);
557 if (s->s3->handshake_dgst)
558 ssl3_free_digest_list(s);
559 s->s3->handshake_buffer = BIO_new(BIO_s_mem());
560 (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);
563 void ssl3_free_digest_list(SSL *s)
566 if (!s->s3->handshake_dgst)
568 for (i = 0; i < SSL_MAX_DIGEST; i++) {
569 if (s->s3->handshake_dgst[i])
570 EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
572 OPENSSL_free(s->s3->handshake_dgst);
573 s->s3->handshake_dgst = NULL;
576 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
578 if (s->s3->handshake_buffer
579 && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) {
580 BIO_write(s->s3->handshake_buffer, (void *)buf, len);
583 for (i = 0; i < SSL_MAX_DIGEST; i++) {
584 if (s->s3->handshake_dgst[i] != NULL)
585 EVP_DigestUpdate(s->s3->handshake_dgst[i], buf, len);
590 int ssl3_digest_cached_records(SSL *s)
598 /* Allocate handshake_dgst array */
599 ssl3_free_digest_list(s);
600 s->s3->handshake_dgst =
601 OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
602 if (s->s3->handshake_dgst == NULL) {
603 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);
606 memset(s->s3->handshake_dgst, 0, SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
607 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
609 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
613 /* Loop through bitso of algorithm2 field and create MD_CTX-es */
614 for (i = 0; ssl_get_handshake_digest(i, &mask, &md); i++) {
615 if ((mask & ssl_get_algorithm2(s)) && md) {
616 s->s3->handshake_dgst[i] = EVP_MD_CTX_create();
617 if (EVP_MD_nid(md) == NID_md5) {
618 EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i],
619 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
621 EVP_DigestInit_ex(s->s3->handshake_dgst[i], md, NULL);
622 EVP_DigestUpdate(s->s3->handshake_dgst[i], hdata, hdatalen);
624 s->s3->handshake_dgst[i] = NULL;
627 if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) {
628 /* Free handshake_buffer BIO */
629 BIO_free(s->s3->handshake_buffer);
630 s->s3->handshake_buffer = NULL;
636 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
638 return (ssl3_handshake_mac(s, md_nid, NULL, 0, p));
641 int ssl3_final_finish_mac(SSL *s,
642 const char *sender, int len, unsigned char *p)
645 ret = ssl3_handshake_mac(s, NID_md5, sender, len, p);
651 sha1len = ssl3_handshake_mac(s, NID_sha1, sender, len, p);
659 static int ssl3_handshake_mac(SSL *s, int md_nid,
660 const char *sender, int len, unsigned char *p)
665 unsigned char md_buf[EVP_MAX_MD_SIZE];
666 EVP_MD_CTX ctx, *d = NULL;
668 if (s->s3->handshake_buffer)
669 if (!ssl3_digest_cached_records(s))
673 * Search for digest of specified type in the handshake_dgst array
675 for (i = 0; i < SSL_MAX_DIGEST; i++) {
676 if (s->s3->handshake_dgst[i]
677 && EVP_MD_CTX_type(s->s3->handshake_dgst[i]) == md_nid) {
678 d = s->s3->handshake_dgst[i];
683 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, SSL_R_NO_REQUIRED_DIGEST);
686 EVP_MD_CTX_init(&ctx);
687 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
688 EVP_MD_CTX_copy_ex(&ctx, d);
689 n = EVP_MD_CTX_size(&ctx);
695 EVP_DigestUpdate(&ctx, sender, len);
696 EVP_DigestUpdate(&ctx, s->session->master_key,
697 s->session->master_key_length);
698 EVP_DigestUpdate(&ctx, ssl3_pad_1, npad);
699 EVP_DigestFinal_ex(&ctx, md_buf, &i);
701 EVP_DigestInit_ex(&ctx, EVP_MD_CTX_md(&ctx), NULL);
702 EVP_DigestUpdate(&ctx, s->session->master_key,
703 s->session->master_key_length);
704 EVP_DigestUpdate(&ctx, ssl3_pad_2, npad);
705 EVP_DigestUpdate(&ctx, md_buf, i);
706 EVP_DigestFinal_ex(&ctx, p, &ret);
708 EVP_MD_CTX_cleanup(&ctx);
713 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
716 unsigned char *mac_sec, *seq;
718 const EVP_MD_CTX *hash;
719 unsigned char *p, rec_char;
725 rec = &(ssl->s3->wrec);
726 mac_sec = &(ssl->s3->write_mac_secret[0]);
727 seq = &(ssl->s3->write_sequence[0]);
728 hash = ssl->write_hash;
730 rec = &(ssl->s3->rrec);
731 mac_sec = &(ssl->s3->read_mac_secret[0]);
732 seq = &(ssl->s3->read_sequence[0]);
733 hash = ssl->read_hash;
736 t = EVP_MD_CTX_size(hash);
740 npad = (48 / md_size) * md_size;
743 EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
744 ssl3_cbc_record_digest_supported(hash)) {
746 * This is a CBC-encrypted record. We must avoid leaking any
747 * timing-side channel information about how many blocks of data we
748 * are hashing because that gives an attacker a timing-oracle.
752 * npad is, at most, 48 bytes and that's with MD5:
753 * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
755 * With SHA-1 (the largest hash speced for SSLv3) the hash size
756 * goes up 4, but npad goes down by 8, resulting in a smaller
759 unsigned char header[75];
761 memcpy(header + j, mac_sec, md_size);
763 memcpy(header + j, ssl3_pad_1, npad);
765 memcpy(header + j, seq, 8);
767 header[j++] = rec->type;
768 header[j++] = rec->length >> 8;
769 header[j++] = rec->length & 0xff;
771 /* Final param == is SSLv3 */
772 ssl3_cbc_digest_record(hash,
775 rec->length + md_size, rec->orig_len,
776 mac_sec, md_size, 1);
778 unsigned int md_size_u;
779 /* Chop the digest off the end :-) */
780 EVP_MD_CTX_init(&md_ctx);
782 EVP_MD_CTX_copy_ex(&md_ctx, hash);
783 EVP_DigestUpdate(&md_ctx, mac_sec, md_size);
784 EVP_DigestUpdate(&md_ctx, ssl3_pad_1, npad);
785 EVP_DigestUpdate(&md_ctx, seq, 8);
786 rec_char = rec->type;
787 EVP_DigestUpdate(&md_ctx, &rec_char, 1);
790 EVP_DigestUpdate(&md_ctx, md, 2);
791 EVP_DigestUpdate(&md_ctx, rec->input, rec->length);
792 EVP_DigestFinal_ex(&md_ctx, md, NULL);
794 EVP_MD_CTX_copy_ex(&md_ctx, hash);
795 EVP_DigestUpdate(&md_ctx, mac_sec, md_size);
796 EVP_DigestUpdate(&md_ctx, ssl3_pad_2, npad);
797 EVP_DigestUpdate(&md_ctx, md, md_size);
798 EVP_DigestFinal_ex(&md_ctx, md, &md_size_u);
801 EVP_MD_CTX_cleanup(&md_ctx);
804 ssl3_record_sequence_update(seq);
808 void ssl3_record_sequence_update(unsigned char *seq)
812 for (i = 7; i >= 0; i--) {
819 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
822 static const unsigned char *salt[3] = {
823 #ifndef CHARSET_EBCDIC
824 (const unsigned char *)"A",
825 (const unsigned char *)"BB",
826 (const unsigned char *)"CCC",
828 (const unsigned char *)"\x41",
829 (const unsigned char *)"\x42\x42",
830 (const unsigned char *)"\x43\x43\x43",
833 unsigned char buf[EVP_MAX_MD_SIZE];
837 #ifdef OPENSSL_SSL_TRACE_CRYPTO
838 unsigned char *tmpout = out;
841 EVP_MD_CTX_init(&ctx);
842 for (i = 0; i < 3; i++) {
843 EVP_DigestInit_ex(&ctx, s->ctx->sha1, NULL);
844 EVP_DigestUpdate(&ctx, salt[i], strlen((const char *)salt[i]));
845 EVP_DigestUpdate(&ctx, p, len);
846 EVP_DigestUpdate(&ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE);
847 EVP_DigestUpdate(&ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE);
848 EVP_DigestFinal_ex(&ctx, buf, &n);
850 EVP_DigestInit_ex(&ctx, s->ctx->md5, NULL);
851 EVP_DigestUpdate(&ctx, p, len);
852 EVP_DigestUpdate(&ctx, buf, n);
853 EVP_DigestFinal_ex(&ctx, out, &n);
857 EVP_MD_CTX_cleanup(&ctx);
859 #ifdef OPENSSL_SSL_TRACE_CRYPTO
860 if (s->msg_callback) {
861 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
862 p, len, s, s->msg_callback_arg);
863 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
864 s->s3->client_random, SSL3_RANDOM_SIZE,
865 s, s->msg_callback_arg);
866 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
867 s->s3->server_random, SSL3_RANDOM_SIZE,
868 s, s->msg_callback_arg);
869 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
870 tmpout, SSL3_MASTER_SECRET_SIZE,
871 s, s->msg_callback_arg);
874 OPENSSL_cleanse(buf, sizeof buf);
878 int ssl3_alert_code(int code)
881 case SSL_AD_CLOSE_NOTIFY:
882 return (SSL3_AD_CLOSE_NOTIFY);
883 case SSL_AD_UNEXPECTED_MESSAGE:
884 return (SSL3_AD_UNEXPECTED_MESSAGE);
885 case SSL_AD_BAD_RECORD_MAC:
886 return (SSL3_AD_BAD_RECORD_MAC);
887 case SSL_AD_DECRYPTION_FAILED:
888 return (SSL3_AD_BAD_RECORD_MAC);
889 case SSL_AD_RECORD_OVERFLOW:
890 return (SSL3_AD_BAD_RECORD_MAC);
891 case SSL_AD_DECOMPRESSION_FAILURE:
892 return (SSL3_AD_DECOMPRESSION_FAILURE);
893 case SSL_AD_HANDSHAKE_FAILURE:
894 return (SSL3_AD_HANDSHAKE_FAILURE);
895 case SSL_AD_NO_CERTIFICATE:
896 return (SSL3_AD_NO_CERTIFICATE);
897 case SSL_AD_BAD_CERTIFICATE:
898 return (SSL3_AD_BAD_CERTIFICATE);
899 case SSL_AD_UNSUPPORTED_CERTIFICATE:
900 return (SSL3_AD_UNSUPPORTED_CERTIFICATE);
901 case SSL_AD_CERTIFICATE_REVOKED:
902 return (SSL3_AD_CERTIFICATE_REVOKED);
903 case SSL_AD_CERTIFICATE_EXPIRED:
904 return (SSL3_AD_CERTIFICATE_EXPIRED);
905 case SSL_AD_CERTIFICATE_UNKNOWN:
906 return (SSL3_AD_CERTIFICATE_UNKNOWN);
907 case SSL_AD_ILLEGAL_PARAMETER:
908 return (SSL3_AD_ILLEGAL_PARAMETER);
909 case SSL_AD_UNKNOWN_CA:
910 return (SSL3_AD_BAD_CERTIFICATE);
911 case SSL_AD_ACCESS_DENIED:
912 return (SSL3_AD_HANDSHAKE_FAILURE);
913 case SSL_AD_DECODE_ERROR:
914 return (SSL3_AD_HANDSHAKE_FAILURE);
915 case SSL_AD_DECRYPT_ERROR:
916 return (SSL3_AD_HANDSHAKE_FAILURE);
917 case SSL_AD_EXPORT_RESTRICTION:
918 return (SSL3_AD_HANDSHAKE_FAILURE);
919 case SSL_AD_PROTOCOL_VERSION:
920 return (SSL3_AD_HANDSHAKE_FAILURE);
921 case SSL_AD_INSUFFICIENT_SECURITY:
922 return (SSL3_AD_HANDSHAKE_FAILURE);
923 case SSL_AD_INTERNAL_ERROR:
924 return (SSL3_AD_HANDSHAKE_FAILURE);
925 case SSL_AD_USER_CANCELLED:
926 return (SSL3_AD_HANDSHAKE_FAILURE);
927 case SSL_AD_NO_RENEGOTIATION:
928 return (-1); /* Don't send it :-) */
929 case SSL_AD_UNSUPPORTED_EXTENSION:
930 return (SSL3_AD_HANDSHAKE_FAILURE);
931 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
932 return (SSL3_AD_HANDSHAKE_FAILURE);
933 case SSL_AD_UNRECOGNIZED_NAME:
934 return (SSL3_AD_HANDSHAKE_FAILURE);
935 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
936 return (SSL3_AD_HANDSHAKE_FAILURE);
937 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
938 return (SSL3_AD_HANDSHAKE_FAILURE);
939 case SSL_AD_UNKNOWN_PSK_IDENTITY:
940 return (TLS1_AD_UNKNOWN_PSK_IDENTITY);
941 case SSL_AD_INAPPROPRIATE_FALLBACK:
942 return (TLS1_AD_INAPPROPRIATE_FALLBACK);