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 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 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 if (ssl_replace_hash(&s->read_hash, m) == NULL) {
257 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
260 #ifndef OPENSSL_NO_COMP
262 if (s->expand != NULL) {
263 COMP_CTX_free(s->expand);
267 s->expand = COMP_CTX_new(comp);
268 if (s->expand == NULL) {
269 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
270 SSL_R_COMPRESSION_LIBRARY_ERROR);
273 if (s->s3->rrec.comp == NULL)
274 s->s3->rrec.comp = (unsigned char *)
275 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
276 if (s->s3->rrec.comp == NULL)
280 memset(&(s->s3->read_sequence[0]), 0, 8);
281 mac_secret = &(s->s3->read_mac_secret[0]);
283 if (s->enc_write_ctx != NULL)
285 else if ((s->enc_write_ctx =
286 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
290 * make sure it's intialized in case we exit later with an error
292 EVP_CIPHER_CTX_init(s->enc_write_ctx);
293 dd = s->enc_write_ctx;
294 if (ssl_replace_hash(&s->write_hash, m) == NULL) {
295 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
298 #ifndef OPENSSL_NO_COMP
300 if (s->compress != NULL) {
301 COMP_CTX_free(s->compress);
305 s->compress = COMP_CTX_new(comp);
306 if (s->compress == NULL) {
307 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
308 SSL_R_COMPRESSION_LIBRARY_ERROR);
313 memset(&(s->s3->write_sequence[0]), 0, 8);
314 mac_secret = &(s->s3->write_mac_secret[0]);
318 EVP_CIPHER_CTX_cleanup(dd);
320 p = s->s3->tmp.key_block;
324 cl = EVP_CIPHER_key_length(c);
325 j = is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
326 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
327 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
328 k = EVP_CIPHER_iv_length(c);
329 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
330 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
337 er1 = &(s->s3->client_random[0]);
338 er2 = &(s->s3->server_random[0]);
347 er1 = &(s->s3->server_random[0]);
348 er2 = &(s->s3->client_random[0]);
351 if (n > s->s3->tmp.key_block_length) {
352 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
356 EVP_MD_CTX_init(&md);
357 memcpy(mac_secret, ms, i);
360 * In here I set both the read and write key/iv to the same value
361 * since only the correct one will be used :-).
363 EVP_DigestInit_ex(&md, EVP_md5(), NULL);
364 EVP_DigestUpdate(&md, key, j);
365 EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE);
366 EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE);
367 EVP_DigestFinal_ex(&md, &(exp_key[0]), NULL);
371 EVP_DigestInit_ex(&md, EVP_md5(), NULL);
372 EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE);
373 EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE);
374 EVP_DigestFinal_ex(&md, &(exp_iv[0]), NULL);
379 s->session->key_arg_length = 0;
381 EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE));
383 #ifdef OPENSSL_SSL_TRACE_CRYPTO
384 if (s->msg_callback) {
386 int wh = which & SSL3_CC_WRITE ?
387 TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
388 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
389 mac_secret, EVP_MD_size(m), s, s->msg_callback_arg);
391 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
392 key, c->key_len, s, s->msg_callback_arg);
394 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,
395 iv, k, s, s->msg_callback_arg);
400 OPENSSL_cleanse(&(exp_key[0]), sizeof(exp_key));
401 OPENSSL_cleanse(&(exp_iv[0]), sizeof(exp_iv));
402 EVP_MD_CTX_cleanup(&md);
405 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
410 int ssl3_setup_key_block(SSL *s)
419 if (s->s3->tmp.key_block_length != 0)
422 if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp)) {
423 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
427 s->s3->tmp.new_sym_enc = c;
428 s->s3->tmp.new_hash = hash;
429 #ifdef OPENSSL_NO_COMP
430 s->s3->tmp.new_compression = NULL;
432 s->s3->tmp.new_compression = comp;
435 num = EVP_MD_size(hash);
439 num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c);
442 ssl3_cleanup_key_block(s);
444 if ((p = OPENSSL_malloc(num)) == NULL)
447 s->s3->tmp.key_block_length = num;
448 s->s3->tmp.key_block = p;
450 ret = ssl3_generate_key_block(s, p, num);
452 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
454 * enable vulnerability countermeasure for CBC ciphers with known-IV
455 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
457 s->s3->need_empty_fragments = 1;
459 if (s->session->cipher != NULL) {
460 if (s->session->cipher->algorithm_enc == SSL_eNULL)
461 s->s3->need_empty_fragments = 0;
463 #ifndef OPENSSL_NO_RC4
464 if (s->session->cipher->algorithm_enc == SSL_RC4)
465 s->s3->need_empty_fragments = 0;
473 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
477 void ssl3_cleanup_key_block(SSL *s)
479 if (s->s3->tmp.key_block != NULL) {
480 OPENSSL_cleanse(s->s3->tmp.key_block, s->s3->tmp.key_block_length);
481 OPENSSL_free(s->s3->tmp.key_block);
482 s->s3->tmp.key_block = NULL;
484 s->s3->tmp.key_block_length = 0;
488 * ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
491 * 0: (in non-constant time) if the record is publically invalid (i.e. too
493 * 1: if the record's padding is valid / the encryption was successful.
494 * -1: if the record's padding is invalid or, if sending, an internal error
497 int ssl3_enc(SSL *s, int send)
502 int bs, i, mac_size = 0;
503 const EVP_CIPHER *enc;
506 ds = s->enc_write_ctx;
507 rec = &(s->s3->wrec);
508 if (s->enc_write_ctx == NULL)
511 enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
513 ds = s->enc_read_ctx;
514 rec = &(s->s3->rrec);
515 if (s->enc_read_ctx == NULL)
518 enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
521 if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) {
522 memmove(rec->data, rec->input, rec->length);
523 rec->input = rec->data;
526 bs = EVP_CIPHER_block_size(ds->cipher);
530 if ((bs != 1) && send) {
531 i = bs - ((int)l % bs);
533 /* we need to add 'i-1' padding bytes */
536 * the last of these zero bytes will be overwritten with the
539 memset(&rec->input[rec->length], 0, i);
541 rec->input[l - 1] = (i - 1);
545 if (l == 0 || l % bs != 0)
547 /* otherwise, rec->length >= bs */
550 if (EVP_Cipher(ds, rec->data, rec->input, l) < 1)
553 if (EVP_MD_CTX_md(s->read_hash) != NULL)
554 mac_size = EVP_MD_CTX_size(s->read_hash);
555 if ((bs != 1) && !send)
556 return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
561 void ssl3_init_finished_mac(SSL *s)
563 if (s->s3->handshake_buffer)
564 BIO_free(s->s3->handshake_buffer);
565 if (s->s3->handshake_dgst)
566 ssl3_free_digest_list(s);
567 s->s3->handshake_buffer = BIO_new(BIO_s_mem());
568 (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);
571 void ssl3_free_digest_list(SSL *s)
574 if (!s->s3->handshake_dgst)
576 for (i = 0; i < SSL_MAX_DIGEST; i++) {
577 if (s->s3->handshake_dgst[i])
578 EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
580 OPENSSL_free(s->s3->handshake_dgst);
581 s->s3->handshake_dgst = NULL;
584 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
586 if (s->s3->handshake_buffer
587 && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) {
588 BIO_write(s->s3->handshake_buffer, (void *)buf, len);
591 for (i = 0; i < SSL_MAX_DIGEST; i++) {
592 if (s->s3->handshake_dgst[i] != NULL)
593 EVP_DigestUpdate(s->s3->handshake_dgst[i], buf, len);
598 int ssl3_digest_cached_records(SSL *s)
606 /* Allocate handshake_dgst array */
607 ssl3_free_digest_list(s);
608 s->s3->handshake_dgst =
609 OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
610 memset(s->s3->handshake_dgst, 0, SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
611 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
613 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
617 /* Loop through bitso of algorithm2 field and create MD_CTX-es */
618 for (i = 0; ssl_get_handshake_digest(i, &mask, &md); i++) {
619 if ((mask & ssl_get_algorithm2(s)) && md) {
620 s->s3->handshake_dgst[i] = EVP_MD_CTX_create();
622 if (EVP_MD_nid(md) == NID_md5) {
623 EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i],
624 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
627 EVP_DigestInit_ex(s->s3->handshake_dgst[i], md, NULL);
628 EVP_DigestUpdate(s->s3->handshake_dgst[i], hdata, hdatalen);
630 s->s3->handshake_dgst[i] = NULL;
633 if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) {
634 /* Free handshake_buffer BIO */
635 BIO_free(s->s3->handshake_buffer);
636 s->s3->handshake_buffer = NULL;
642 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
644 return (ssl3_handshake_mac(s, md_nid, NULL, 0, p));
647 int ssl3_final_finish_mac(SSL *s,
648 const char *sender, int len, unsigned char *p)
651 ret = ssl3_handshake_mac(s, NID_md5, sender, len, p);
657 sha1len = ssl3_handshake_mac(s, NID_sha1, sender, len, p);
665 static int ssl3_handshake_mac(SSL *s, int md_nid,
666 const char *sender, int len, unsigned char *p)
671 unsigned char md_buf[EVP_MAX_MD_SIZE];
672 EVP_MD_CTX ctx, *d = NULL;
674 if (s->s3->handshake_buffer)
675 if (!ssl3_digest_cached_records(s))
679 * Search for digest of specified type in the handshake_dgst array
681 for (i = 0; i < SSL_MAX_DIGEST; i++) {
682 if (s->s3->handshake_dgst[i]
683 && EVP_MD_CTX_type(s->s3->handshake_dgst[i]) == md_nid) {
684 d = s->s3->handshake_dgst[i];
689 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, SSL_R_NO_REQUIRED_DIGEST);
692 EVP_MD_CTX_init(&ctx);
693 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
694 EVP_MD_CTX_copy_ex(&ctx, d);
695 n = EVP_MD_CTX_size(&ctx);
700 if ((sender != NULL && EVP_DigestUpdate(&ctx, sender, len) <= 0)
701 || EVP_DigestUpdate(&ctx, s->session->master_key,
702 s->session->master_key_length) <= 0
703 || EVP_DigestUpdate(&ctx, ssl3_pad_1, npad) <= 0
704 || EVP_DigestFinal_ex(&ctx, md_buf, &i) <= 0
706 || EVP_DigestInit_ex(&ctx, EVP_MD_CTX_md(&ctx), NULL) <= 0
707 || EVP_DigestUpdate(&ctx, s->session->master_key,
708 s->session->master_key_length) <= 0
709 || EVP_DigestUpdate(&ctx, ssl3_pad_2, npad) <= 0
710 || EVP_DigestUpdate(&ctx, md_buf, i) <= 0
711 || EVP_DigestFinal_ex(&ctx, p, &ret) <= 0) {
712 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, ERR_R_INTERNAL_ERROR);
716 EVP_MD_CTX_cleanup(&ctx);
721 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
724 unsigned char *mac_sec, *seq;
726 const EVP_MD_CTX *hash;
727 unsigned char *p, rec_char;
728 size_t md_size, orig_len;
733 rec = &(ssl->s3->wrec);
734 mac_sec = &(ssl->s3->write_mac_secret[0]);
735 seq = &(ssl->s3->write_sequence[0]);
736 hash = ssl->write_hash;
738 rec = &(ssl->s3->rrec);
739 mac_sec = &(ssl->s3->read_mac_secret[0]);
740 seq = &(ssl->s3->read_sequence[0]);
741 hash = ssl->read_hash;
744 t = EVP_MD_CTX_size(hash);
748 npad = (48 / md_size) * md_size;
751 * kludge: ssl3_cbc_remove_padding passes padding length in rec->type
753 orig_len = rec->length + md_size + ((unsigned int)rec->type >> 8);
757 EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
758 ssl3_cbc_record_digest_supported(hash)) {
760 * This is a CBC-encrypted record. We must avoid leaking any
761 * timing-side channel information about how many blocks of data we
762 * are hashing because that gives an attacker a timing-oracle.
766 * npad is, at most, 48 bytes and that's with MD5:
767 * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
769 * With SHA-1 (the largest hash speced for SSLv3) the hash size
770 * goes up 4, but npad goes down by 8, resulting in a smaller
773 unsigned char header[75];
775 memcpy(header + j, mac_sec, md_size);
777 memcpy(header + j, ssl3_pad_1, npad);
779 memcpy(header + j, seq, 8);
781 header[j++] = rec->type;
782 header[j++] = rec->length >> 8;
783 header[j++] = rec->length & 0xff;
785 /* Final param == is SSLv3 */
786 if (ssl3_cbc_digest_record(hash,
789 rec->length + md_size, orig_len,
790 mac_sec, md_size, 1) <= 0)
793 unsigned int md_size_u;
794 /* Chop the digest off the end :-) */
795 EVP_MD_CTX_init(&md_ctx);
797 rec_char = rec->type;
800 if (EVP_MD_CTX_copy_ex(&md_ctx, hash) <= 0
801 || EVP_DigestUpdate(&md_ctx, mac_sec, md_size) <= 0
802 || EVP_DigestUpdate(&md_ctx, ssl3_pad_1, npad) <= 0
803 || EVP_DigestUpdate(&md_ctx, seq, 8) <= 0
804 || EVP_DigestUpdate(&md_ctx, &rec_char, 1) <= 0
805 || EVP_DigestUpdate(&md_ctx, md, 2) <= 0
806 || EVP_DigestUpdate(&md_ctx, rec->input, rec->length) <= 0
807 || EVP_DigestFinal_ex(&md_ctx, md, NULL) <= 0
808 || EVP_MD_CTX_copy_ex(&md_ctx, hash) <= 0
809 || EVP_DigestUpdate(&md_ctx, mac_sec, md_size) <= 0
810 || EVP_DigestUpdate(&md_ctx, ssl3_pad_2, npad) <= 0
811 || EVP_DigestUpdate(&md_ctx, md, md_size) <= 0
812 || EVP_DigestFinal_ex(&md_ctx, md, &md_size_u) <= 0) {
813 EVP_MD_CTX_cleanup(&md_ctx);
818 EVP_MD_CTX_cleanup(&md_ctx);
821 ssl3_record_sequence_update(seq);
825 void ssl3_record_sequence_update(unsigned char *seq)
829 for (i = 7; i >= 0; i--) {
836 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
839 static const unsigned char *salt[3] = {
840 #ifndef CHARSET_EBCDIC
841 (const unsigned char *)"A",
842 (const unsigned char *)"BB",
843 (const unsigned char *)"CCC",
845 (const unsigned char *)"\x41",
846 (const unsigned char *)"\x42\x42",
847 (const unsigned char *)"\x43\x43\x43",
850 unsigned char buf[EVP_MAX_MD_SIZE];
854 #ifdef OPENSSL_SSL_TRACE_CRYPTO
855 unsigned char *tmpout = out;
858 EVP_MD_CTX_init(&ctx);
859 for (i = 0; i < 3; i++) {
860 if (EVP_DigestInit_ex(&ctx, s->ctx->sha1, NULL) <= 0
861 || EVP_DigestUpdate(&ctx, salt[i],
862 strlen((const char *)salt[i])) <= 0
863 || EVP_DigestUpdate(&ctx, p, len) <= 0
864 || EVP_DigestUpdate(&ctx, &(s->s3->client_random[0]),
865 SSL3_RANDOM_SIZE) <= 0
866 || EVP_DigestUpdate(&ctx, &(s->s3->server_random[0]),
867 SSL3_RANDOM_SIZE) <= 0
868 || EVP_DigestFinal_ex(&ctx, buf, &n) <= 0
870 || EVP_DigestInit_ex(&ctx, s->ctx->md5, NULL) <= 0
871 || EVP_DigestUpdate(&ctx, p, len) <= 0
872 || EVP_DigestUpdate(&ctx, buf, n) <= 0
873 || EVP_DigestFinal_ex(&ctx, out, &n) <= 0) {
874 SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_INTERNAL_ERROR);
881 EVP_MD_CTX_cleanup(&ctx);
883 #ifdef OPENSSL_SSL_TRACE_CRYPTO
884 if (ret > 0 && s->msg_callback) {
885 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
886 p, len, s, s->msg_callback_arg);
887 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
888 s->s3->client_random, SSL3_RANDOM_SIZE,
889 s, s->msg_callback_arg);
890 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
891 s->s3->server_random, SSL3_RANDOM_SIZE,
892 s, s->msg_callback_arg);
893 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
894 tmpout, SSL3_MASTER_SECRET_SIZE,
895 s, s->msg_callback_arg);
898 OPENSSL_cleanse(buf, sizeof buf);
902 int ssl3_alert_code(int code)
905 case SSL_AD_CLOSE_NOTIFY:
906 return (SSL3_AD_CLOSE_NOTIFY);
907 case SSL_AD_UNEXPECTED_MESSAGE:
908 return (SSL3_AD_UNEXPECTED_MESSAGE);
909 case SSL_AD_BAD_RECORD_MAC:
910 return (SSL3_AD_BAD_RECORD_MAC);
911 case SSL_AD_DECRYPTION_FAILED:
912 return (SSL3_AD_BAD_RECORD_MAC);
913 case SSL_AD_RECORD_OVERFLOW:
914 return (SSL3_AD_BAD_RECORD_MAC);
915 case SSL_AD_DECOMPRESSION_FAILURE:
916 return (SSL3_AD_DECOMPRESSION_FAILURE);
917 case SSL_AD_HANDSHAKE_FAILURE:
918 return (SSL3_AD_HANDSHAKE_FAILURE);
919 case SSL_AD_NO_CERTIFICATE:
920 return (SSL3_AD_NO_CERTIFICATE);
921 case SSL_AD_BAD_CERTIFICATE:
922 return (SSL3_AD_BAD_CERTIFICATE);
923 case SSL_AD_UNSUPPORTED_CERTIFICATE:
924 return (SSL3_AD_UNSUPPORTED_CERTIFICATE);
925 case SSL_AD_CERTIFICATE_REVOKED:
926 return (SSL3_AD_CERTIFICATE_REVOKED);
927 case SSL_AD_CERTIFICATE_EXPIRED:
928 return (SSL3_AD_CERTIFICATE_EXPIRED);
929 case SSL_AD_CERTIFICATE_UNKNOWN:
930 return (SSL3_AD_CERTIFICATE_UNKNOWN);
931 case SSL_AD_ILLEGAL_PARAMETER:
932 return (SSL3_AD_ILLEGAL_PARAMETER);
933 case SSL_AD_UNKNOWN_CA:
934 return (SSL3_AD_BAD_CERTIFICATE);
935 case SSL_AD_ACCESS_DENIED:
936 return (SSL3_AD_HANDSHAKE_FAILURE);
937 case SSL_AD_DECODE_ERROR:
938 return (SSL3_AD_HANDSHAKE_FAILURE);
939 case SSL_AD_DECRYPT_ERROR:
940 return (SSL3_AD_HANDSHAKE_FAILURE);
941 case SSL_AD_EXPORT_RESTRICTION:
942 return (SSL3_AD_HANDSHAKE_FAILURE);
943 case SSL_AD_PROTOCOL_VERSION:
944 return (SSL3_AD_HANDSHAKE_FAILURE);
945 case SSL_AD_INSUFFICIENT_SECURITY:
946 return (SSL3_AD_HANDSHAKE_FAILURE);
947 case SSL_AD_INTERNAL_ERROR:
948 return (SSL3_AD_HANDSHAKE_FAILURE);
949 case SSL_AD_USER_CANCELLED:
950 return (SSL3_AD_HANDSHAKE_FAILURE);
951 case SSL_AD_NO_RENEGOTIATION:
952 return (-1); /* Don't send it :-) */
953 case SSL_AD_UNSUPPORTED_EXTENSION:
954 return (SSL3_AD_HANDSHAKE_FAILURE);
955 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
956 return (SSL3_AD_HANDSHAKE_FAILURE);
957 case SSL_AD_UNRECOGNIZED_NAME:
958 return (SSL3_AD_HANDSHAKE_FAILURE);
959 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
960 return (SSL3_AD_HANDSHAKE_FAILURE);
961 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
962 return (SSL3_AD_HANDSHAKE_FAILURE);
963 case SSL_AD_UNKNOWN_PSK_IDENTITY:
964 return (TLS1_AD_UNKNOWN_PSK_IDENTITY);
965 case SSL_AD_INAPPROPRIATE_FALLBACK:
966 return (TLS1_AD_INAPPROPRIATE_FALLBACK);