1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
56 */
57 /* ====================================================================
58 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
59 *
60 * Redistribution and use in source and binary forms, with or without
61 * modification, are permitted provided that the following conditions
62 * are met:
63 *
64 * 1. Redistributions of source code must retain the above copyright
65 * notice, this list of conditions and the following disclaimer.
66 *
67 * 2. Redistributions in binary form must reproduce the above copyright
68 * notice, this list of conditions and the following disclaimer in
69 * the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3. All advertising materials mentioning features or use of this
73 * software must display the following acknowledgment:
74 * "This product includes software developed by the OpenSSL Project
75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
76 *
77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
78 * endorse or promote products derived from this software without
79 * prior written permission. For written permission, please contact
80 * openssl-core@openssl.org.
81 *
82 * 5. Products derived from this software may not be called "OpenSSL"
83 * nor may "OpenSSL" appear in their names without prior written
84 * permission of the OpenSSL Project.
85 *
86 * 6. Redistributions of any form whatsoever must retain the following
87 * acknowledgment:
88 * "This product includes software developed by the OpenSSL Project
89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
90 *
91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
102 * OF THE POSSIBILITY OF SUCH DAMAGE.
103 * ====================================================================
104 *
105 * This product includes cryptographic software written by Eric Young
106 * (eay@cryptsoft.com). This product includes software written by Tim
107 * Hudson (tjh@cryptsoft.com).
108 *
109 */
110 /* ====================================================================
111 * Copyright 2005 Nokia. All rights reserved.
112 *
113 * The portions of the attached software ("Contribution") is developed by
114 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
115 * license.
116 *
117 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
118 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
119 * support (see RFC 4279) to OpenSSL.
120 *
121 * No patent licenses or other rights except those expressly stated in
122 * the OpenSSL open source license shall be deemed granted or received
123 * expressly, by implication, estoppel, or otherwise.
124 *
125 * No assurances are provided by Nokia that the Contribution does not
126 * infringe the patent or other intellectual property rights of any third
127 * party or that the license provides you with all the necessary rights
128 * to make use of the Contribution.
129 *
130 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
131 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
132 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
133 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
134 * OTHERWISE. */
135
136 #include <openssl/ssl.h>
137
138 #include <assert.h>
139 #include <stdio.h>
140 #include <string.h>
141
142 #include <openssl/err.h>
143 #include <openssl/evp.h>
144 #include <openssl/hmac.h>
145 #include <openssl/md5.h>
146 #include <openssl/mem.h>
147 #include <openssl/obj.h>
148 #include <openssl/rand.h>
149
150 #include "internal.h"
151
152
153 /* tls1_P_hash computes the TLS P_<hash> function as described in RFC 5246,
154 * section 5. It XORs |out_len| bytes to |out|, using |md| as the hash and
155 * |secret| as the secret. |seed1| through |seed3| are concatenated to form the
156 * seed parameter. It returns one on success and zero on failure. */
tls1_P_hash(uint8_t * out,size_t out_len,const EVP_MD * md,const uint8_t * secret,size_t secret_len,const uint8_t * seed1,size_t seed1_len,const uint8_t * seed2,size_t seed2_len,const uint8_t * seed3,size_t seed3_len)157 static int tls1_P_hash(uint8_t *out, size_t out_len, const EVP_MD *md,
158 const uint8_t *secret, size_t secret_len,
159 const uint8_t *seed1, size_t seed1_len,
160 const uint8_t *seed2, size_t seed2_len,
161 const uint8_t *seed3, size_t seed3_len) {
162 HMAC_CTX ctx, ctx_tmp, ctx_init;
163 uint8_t A1[EVP_MAX_MD_SIZE];
164 unsigned A1_len;
165 int ret = 0;
166
167 size_t chunk = EVP_MD_size(md);
168
169 HMAC_CTX_init(&ctx);
170 HMAC_CTX_init(&ctx_tmp);
171 HMAC_CTX_init(&ctx_init);
172 if (!HMAC_Init_ex(&ctx_init, secret, secret_len, md, NULL) ||
173 !HMAC_CTX_copy_ex(&ctx, &ctx_init) ||
174 !HMAC_Update(&ctx, seed1, seed1_len) ||
175 !HMAC_Update(&ctx, seed2, seed2_len) ||
176 !HMAC_Update(&ctx, seed3, seed3_len) ||
177 !HMAC_Final(&ctx, A1, &A1_len)) {
178 goto err;
179 }
180
181 for (;;) {
182 unsigned len;
183 uint8_t hmac[EVP_MAX_MD_SIZE];
184 if (!HMAC_CTX_copy_ex(&ctx, &ctx_init) ||
185 !HMAC_Update(&ctx, A1, A1_len) ||
186 /* Save a copy of |ctx| to compute the next A1 value below. */
187 (out_len > chunk && !HMAC_CTX_copy_ex(&ctx_tmp, &ctx)) ||
188 !HMAC_Update(&ctx, seed1, seed1_len) ||
189 !HMAC_Update(&ctx, seed2, seed2_len) ||
190 !HMAC_Update(&ctx, seed3, seed3_len) ||
191 !HMAC_Final(&ctx, hmac, &len)) {
192 goto err;
193 }
194 assert(len == chunk);
195
196 /* XOR the result into |out|. */
197 if (len > out_len) {
198 len = out_len;
199 }
200 unsigned i;
201 for (i = 0; i < len; i++) {
202 out[i] ^= hmac[i];
203 }
204 out += len;
205 out_len -= len;
206
207 if (out_len == 0) {
208 break;
209 }
210
211 /* Calculate the next A1 value. */
212 if (!HMAC_Final(&ctx_tmp, A1, &A1_len)) {
213 goto err;
214 }
215 }
216
217 ret = 1;
218
219 err:
220 HMAC_CTX_cleanup(&ctx);
221 HMAC_CTX_cleanup(&ctx_tmp);
222 HMAC_CTX_cleanup(&ctx_init);
223 OPENSSL_cleanse(A1, sizeof(A1));
224 return ret;
225 }
226
tls1_prf(SSL * ssl,uint8_t * out,size_t out_len,const uint8_t * secret,size_t secret_len,const char * label,size_t label_len,const uint8_t * seed1,size_t seed1_len,const uint8_t * seed2,size_t seed2_len)227 int tls1_prf(SSL *ssl, uint8_t *out, size_t out_len, const uint8_t *secret,
228 size_t secret_len, const char *label, size_t label_len,
229 const uint8_t *seed1, size_t seed1_len,
230 const uint8_t *seed2, size_t seed2_len) {
231
232 if (out_len == 0) {
233 return 1;
234 }
235
236 memset(out, 0, out_len);
237
238 uint32_t algorithm_prf = ssl_get_algorithm_prf(ssl);
239 if (algorithm_prf == SSL_HANDSHAKE_MAC_DEFAULT) {
240 /* If using the MD5/SHA1 PRF, |secret| is partitioned between SHA-1 and
241 * MD5, MD5 first. */
242 size_t secret_half = secret_len - (secret_len / 2);
243 if (!tls1_P_hash(out, out_len, EVP_md5(), secret, secret_half,
244 (const uint8_t *)label, label_len, seed1, seed1_len, seed2,
245 seed2_len)) {
246 return 0;
247 }
248
249 /* Note that, if |secret_len| is odd, the two halves share a byte. */
250 secret = secret + (secret_len - secret_half);
251 secret_len = secret_half;
252 }
253
254 if (!tls1_P_hash(out, out_len, ssl_get_handshake_digest(algorithm_prf),
255 secret, secret_len, (const uint8_t *)label, label_len,
256 seed1, seed1_len, seed2, seed2_len)) {
257 return 0;
258 }
259
260 return 1;
261 }
262
tls1_generate_key_block(SSL * ssl,uint8_t * out,size_t out_len)263 static int tls1_generate_key_block(SSL *ssl, uint8_t *out, size_t out_len) {
264 return ssl->enc_method->prf(
265 ssl, out, out_len, ssl->session->master_key,
266 ssl->session->master_key_length, TLS_MD_KEY_EXPANSION_CONST,
267 TLS_MD_KEY_EXPANSION_CONST_SIZE, ssl->s3->server_random, SSL3_RANDOM_SIZE,
268 ssl->s3->client_random, SSL3_RANDOM_SIZE);
269 }
270
tls1_change_cipher_state(SSL * ssl,int which)271 int tls1_change_cipher_state(SSL *ssl, int which) {
272 /* is_read is true if we have just read a ChangeCipherSpec message - i.e. we
273 * need to update the read cipherspec. Otherwise we have just written one. */
274 const char is_read = (which & SSL3_CC_READ) != 0;
275 /* use_client_keys is true if we wish to use the keys for the "client write"
276 * direction. This is the case if we're a client sending a ChangeCipherSpec,
277 * or a server reading a client's ChangeCipherSpec. */
278 const char use_client_keys = which == SSL3_CHANGE_CIPHER_CLIENT_WRITE ||
279 which == SSL3_CHANGE_CIPHER_SERVER_READ;
280 const uint8_t *client_write_mac_secret, *server_write_mac_secret, *mac_secret;
281 const uint8_t *client_write_key, *server_write_key, *key;
282 const uint8_t *client_write_iv, *server_write_iv, *iv;
283 const EVP_AEAD *aead = ssl->s3->tmp.new_aead;
284 size_t key_len, iv_len, mac_secret_len;
285 const uint8_t *key_data;
286
287 /* Reset sequence number to zero. */
288 if (is_read) {
289 if (SSL_IS_DTLS(ssl)) {
290 ssl->d1->r_epoch++;
291 memset(&ssl->d1->bitmap, 0, sizeof(ssl->d1->bitmap));
292 }
293 memset(ssl->s3->read_sequence, 0, sizeof(ssl->s3->read_sequence));
294 } else {
295 if (SSL_IS_DTLS(ssl)) {
296 ssl->d1->w_epoch++;
297 memcpy(ssl->d1->last_write_sequence, ssl->s3->write_sequence,
298 sizeof(ssl->s3->write_sequence));
299 }
300 memset(ssl->s3->write_sequence, 0, sizeof(ssl->s3->write_sequence));
301 }
302
303 mac_secret_len = ssl->s3->tmp.new_mac_secret_len;
304 iv_len = ssl->s3->tmp.new_fixed_iv_len;
305
306 if (aead == NULL) {
307 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
308 return 0;
309 }
310
311 key_len = EVP_AEAD_key_length(aead);
312 if (mac_secret_len > 0) {
313 /* For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher
314 * suites) the key length reported by |EVP_AEAD_key_length| will
315 * include the MAC and IV key bytes. */
316 if (key_len < mac_secret_len + iv_len) {
317 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
318 return 0;
319 }
320 key_len -= mac_secret_len + iv_len;
321 }
322
323 key_data = ssl->s3->tmp.key_block;
324 client_write_mac_secret = key_data;
325 key_data += mac_secret_len;
326 server_write_mac_secret = key_data;
327 key_data += mac_secret_len;
328 client_write_key = key_data;
329 key_data += key_len;
330 server_write_key = key_data;
331 key_data += key_len;
332 client_write_iv = key_data;
333 key_data += iv_len;
334 server_write_iv = key_data;
335 key_data += iv_len;
336
337 if (use_client_keys) {
338 mac_secret = client_write_mac_secret;
339 key = client_write_key;
340 iv = client_write_iv;
341 } else {
342 mac_secret = server_write_mac_secret;
343 key = server_write_key;
344 iv = server_write_iv;
345 }
346
347 if (key_data - ssl->s3->tmp.key_block != ssl->s3->tmp.key_block_length) {
348 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
349 return 0;
350 }
351
352 if (is_read) {
353 SSL_AEAD_CTX_free(ssl->aead_read_ctx);
354 ssl->aead_read_ctx = SSL_AEAD_CTX_new(
355 evp_aead_open, ssl3_version_from_wire(ssl, ssl->version),
356 ssl->s3->tmp.new_cipher, key, key_len, mac_secret, mac_secret_len, iv,
357 iv_len);
358 return ssl->aead_read_ctx != NULL;
359 }
360
361 SSL_AEAD_CTX_free(ssl->aead_write_ctx);
362 ssl->aead_write_ctx = SSL_AEAD_CTX_new(
363 evp_aead_seal, ssl3_version_from_wire(ssl, ssl->version),
364 ssl->s3->tmp.new_cipher, key, key_len, mac_secret, mac_secret_len, iv,
365 iv_len);
366 return ssl->aead_write_ctx != NULL;
367 }
368
tls1_setup_key_block(SSL * ssl)369 int tls1_setup_key_block(SSL *ssl) {
370 uint8_t *p;
371 const EVP_AEAD *aead = NULL;
372 int ret = 0;
373 size_t mac_secret_len, fixed_iv_len, variable_iv_len, key_len;
374 size_t key_block_len;
375
376 if (ssl->s3->tmp.key_block_length != 0) {
377 return 1;
378 }
379
380 if (ssl->session->cipher == NULL) {
381 goto cipher_unavailable_err;
382 }
383
384 if (!ssl_cipher_get_evp_aead(&aead, &mac_secret_len, &fixed_iv_len,
385 ssl->session->cipher,
386 ssl3_version_from_wire(ssl, ssl->version))) {
387 goto cipher_unavailable_err;
388 }
389 key_len = EVP_AEAD_key_length(aead);
390 variable_iv_len = EVP_AEAD_nonce_length(aead);
391 if (mac_secret_len > 0) {
392 /* For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher suites) the
393 * key length reported by |EVP_AEAD_key_length| will include the MAC key
394 * bytes and initial implicit IV. */
395 if (key_len < mac_secret_len + fixed_iv_len) {
396 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
397 return 0;
398 }
399 key_len -= mac_secret_len + fixed_iv_len;
400 } else {
401 /* The nonce is split into a fixed portion and a variable portion. */
402 if (variable_iv_len < fixed_iv_len) {
403 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
404 return 0;
405 }
406 variable_iv_len -= fixed_iv_len;
407 }
408
409 assert(mac_secret_len < 256);
410 assert(fixed_iv_len < 256);
411 assert(variable_iv_len < 256);
412
413 ssl->s3->tmp.new_aead = aead;
414 ssl->s3->tmp.new_mac_secret_len = (uint8_t)mac_secret_len;
415 ssl->s3->tmp.new_fixed_iv_len = (uint8_t)fixed_iv_len;
416 ssl->s3->tmp.new_variable_iv_len = (uint8_t)variable_iv_len;
417
418 key_block_len = key_len + mac_secret_len + fixed_iv_len;
419 key_block_len *= 2;
420
421 ssl3_cleanup_key_block(ssl);
422
423 p = (uint8_t *)OPENSSL_malloc(key_block_len);
424 if (p == NULL) {
425 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
426 goto err;
427 }
428
429 ssl->s3->tmp.key_block_length = key_block_len;
430 ssl->s3->tmp.key_block = p;
431
432 if (!tls1_generate_key_block(ssl, p, key_block_len)) {
433 goto err;
434 }
435
436 ret = 1;
437
438 err:
439 return ret;
440
441 cipher_unavailable_err:
442 OPENSSL_PUT_ERROR(SSL, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
443 return 0;
444 }
445
tls1_cert_verify_mac(SSL * ssl,int md_nid,uint8_t * out)446 int tls1_cert_verify_mac(SSL *ssl, int md_nid, uint8_t *out) {
447 const EVP_MD_CTX *ctx_template;
448 if (md_nid == NID_md5) {
449 ctx_template = &ssl->s3->handshake_md5;
450 } else if (md_nid == EVP_MD_CTX_type(&ssl->s3->handshake_hash)) {
451 ctx_template = &ssl->s3->handshake_hash;
452 } else {
453 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_REQUIRED_DIGEST);
454 return 0;
455 }
456
457 EVP_MD_CTX ctx;
458 EVP_MD_CTX_init(&ctx);
459 if (!EVP_MD_CTX_copy_ex(&ctx, ctx_template)) {
460 EVP_MD_CTX_cleanup(&ctx);
461 return 0;
462 }
463 unsigned ret;
464 EVP_DigestFinal_ex(&ctx, out, &ret);
465 EVP_MD_CTX_cleanup(&ctx);
466 return ret;
467 }
468
append_digest(const EVP_MD_CTX * ctx,uint8_t * out,size_t * out_len,size_t max_out)469 static int append_digest(const EVP_MD_CTX *ctx, uint8_t *out, size_t *out_len,
470 size_t max_out) {
471 int ret = 0;
472 EVP_MD_CTX ctx_copy;
473 EVP_MD_CTX_init(&ctx_copy);
474
475 if (EVP_MD_CTX_size(ctx) > max_out) {
476 OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFER_TOO_SMALL);
477 goto err;
478 }
479 unsigned len;
480 if (!EVP_MD_CTX_copy_ex(&ctx_copy, ctx) ||
481 !EVP_DigestFinal_ex(&ctx_copy, out, &len)) {
482 goto err;
483 }
484 assert(len == EVP_MD_CTX_size(ctx));
485
486 *out_len = len;
487 ret = 1;
488
489 err:
490 EVP_MD_CTX_cleanup(&ctx_copy);
491 return ret;
492 }
493
494 /* tls1_handshake_digest calculates the current handshake hash and writes it to
495 * |out|, which has space for |out_len| bytes. It returns the number of bytes
496 * written or -1 in the event of an error. This function works on a copy of the
497 * underlying digests so can be called multiple times and prior to the final
498 * update etc. */
tls1_handshake_digest(SSL * ssl,uint8_t * out,size_t out_len)499 int tls1_handshake_digest(SSL *ssl, uint8_t *out, size_t out_len) {
500 size_t md5_len = 0;
501 if (EVP_MD_CTX_md(&ssl->s3->handshake_md5) != NULL &&
502 !append_digest(&ssl->s3->handshake_md5, out, &md5_len, out_len)) {
503 return -1;
504 }
505
506 size_t len;
507 if (!append_digest(&ssl->s3->handshake_hash, out + md5_len, &len,
508 out_len - md5_len)) {
509 return -1;
510 }
511
512 return (int)(md5_len + len);
513 }
514
tls1_final_finish_mac(SSL * ssl,const char * str,int slen,uint8_t * out)515 int tls1_final_finish_mac(SSL *ssl, const char *str, int slen, uint8_t *out) {
516 uint8_t buf[2 * EVP_MAX_MD_SIZE];
517 int err = 0;
518 int digests_len;
519
520 /* At this point, the handshake should have released the handshake buffer on
521 * its own. */
522 assert(ssl->s3->handshake_buffer == NULL);
523
524 digests_len = tls1_handshake_digest(ssl, buf, sizeof(buf));
525 if (digests_len < 0) {
526 err = 1;
527 digests_len = 0;
528 }
529
530 if (!ssl->enc_method->prf(ssl, out, 12, ssl->session->master_key,
531 ssl->session->master_key_length, str, slen, buf,
532 digests_len, NULL, 0)) {
533 err = 1;
534 }
535
536 if (err) {
537 return 0;
538 } else {
539 return 12;
540 }
541 }
542
tls1_generate_master_secret(SSL * ssl,uint8_t * out,const uint8_t * premaster,size_t premaster_len)543 int tls1_generate_master_secret(SSL *ssl, uint8_t *out,
544 const uint8_t *premaster,
545 size_t premaster_len) {
546 if (ssl->s3->tmp.extended_master_secret) {
547 uint8_t digests[2 * EVP_MAX_MD_SIZE];
548 int digests_len = tls1_handshake_digest(ssl, digests, sizeof(digests));
549 if (digests_len == -1) {
550 return 0;
551 }
552
553 if (!ssl->enc_method->prf(ssl, out, SSL3_MASTER_SECRET_SIZE, premaster,
554 premaster_len,
555 TLS_MD_EXTENDED_MASTER_SECRET_CONST,
556 TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE, digests,
557 digests_len, NULL, 0)) {
558 return 0;
559 }
560 } else {
561 if (!ssl->enc_method->prf(ssl, out, SSL3_MASTER_SECRET_SIZE, premaster,
562 premaster_len, TLS_MD_MASTER_SECRET_CONST,
563 TLS_MD_MASTER_SECRET_CONST_SIZE,
564 ssl->s3->client_random, SSL3_RANDOM_SIZE,
565 ssl->s3->server_random, SSL3_RANDOM_SIZE)) {
566 return 0;
567 }
568 }
569
570 return SSL3_MASTER_SECRET_SIZE;
571 }
572
tls1_export_keying_material(SSL * ssl,uint8_t * out,size_t out_len,const char * label,size_t label_len,const uint8_t * context,size_t context_len,int use_context)573 int tls1_export_keying_material(SSL *ssl, uint8_t *out, size_t out_len,
574 const char *label, size_t label_len,
575 const uint8_t *context, size_t context_len,
576 int use_context) {
577 if (!ssl->s3->have_version || ssl->version == SSL3_VERSION) {
578 OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
579 return 0;
580 }
581
582 size_t seed_len = 2 * SSL3_RANDOM_SIZE;
583 if (use_context) {
584 if (context_len >= 1u << 16) {
585 OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
586 return 0;
587 }
588 seed_len += 2 + context_len;
589 }
590 uint8_t *seed = OPENSSL_malloc(seed_len);
591 if (seed == NULL) {
592 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
593 return 0;
594 }
595
596 memcpy(seed, ssl->s3->client_random, SSL3_RANDOM_SIZE);
597 memcpy(seed + SSL3_RANDOM_SIZE, ssl->s3->server_random, SSL3_RANDOM_SIZE);
598 if (use_context) {
599 seed[2 * SSL3_RANDOM_SIZE] = (uint8_t)(context_len >> 8);
600 seed[2 * SSL3_RANDOM_SIZE + 1] = (uint8_t)context_len;
601 memcpy(seed + 2 * SSL3_RANDOM_SIZE + 2, context, context_len);
602 }
603
604 int ret = ssl->enc_method->prf(ssl, out, out_len, ssl->session->master_key,
605 ssl->session->master_key_length, label,
606 label_len, seed, seed_len, NULL, 0);
607 OPENSSL_free(seed);
608 return ret;
609 }
610
tls1_alert_code(int code)611 int tls1_alert_code(int code) {
612 switch (code) {
613 case SSL_AD_CLOSE_NOTIFY:
614 return SSL3_AD_CLOSE_NOTIFY;
615
616 case SSL_AD_UNEXPECTED_MESSAGE:
617 return SSL3_AD_UNEXPECTED_MESSAGE;
618
619 case SSL_AD_BAD_RECORD_MAC:
620 return SSL3_AD_BAD_RECORD_MAC;
621
622 case SSL_AD_DECRYPTION_FAILED:
623 return TLS1_AD_DECRYPTION_FAILED;
624
625 case SSL_AD_RECORD_OVERFLOW:
626 return TLS1_AD_RECORD_OVERFLOW;
627
628 case SSL_AD_DECOMPRESSION_FAILURE:
629 return SSL3_AD_DECOMPRESSION_FAILURE;
630
631 case SSL_AD_HANDSHAKE_FAILURE:
632 return SSL3_AD_HANDSHAKE_FAILURE;
633
634 case SSL_AD_NO_CERTIFICATE:
635 return -1;
636
637 case SSL_AD_BAD_CERTIFICATE:
638 return SSL3_AD_BAD_CERTIFICATE;
639
640 case SSL_AD_UNSUPPORTED_CERTIFICATE:
641 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
642
643 case SSL_AD_CERTIFICATE_REVOKED:
644 return SSL3_AD_CERTIFICATE_REVOKED;
645
646 case SSL_AD_CERTIFICATE_EXPIRED:
647 return SSL3_AD_CERTIFICATE_EXPIRED;
648
649 case SSL_AD_CERTIFICATE_UNKNOWN:
650 return SSL3_AD_CERTIFICATE_UNKNOWN;
651
652 case SSL_AD_ILLEGAL_PARAMETER:
653 return SSL3_AD_ILLEGAL_PARAMETER;
654
655 case SSL_AD_UNKNOWN_CA:
656 return TLS1_AD_UNKNOWN_CA;
657
658 case SSL_AD_ACCESS_DENIED:
659 return TLS1_AD_ACCESS_DENIED;
660
661 case SSL_AD_DECODE_ERROR:
662 return TLS1_AD_DECODE_ERROR;
663
664 case SSL_AD_DECRYPT_ERROR:
665 return TLS1_AD_DECRYPT_ERROR;
666 case SSL_AD_EXPORT_RESTRICTION:
667 return TLS1_AD_EXPORT_RESTRICTION;
668
669 case SSL_AD_PROTOCOL_VERSION:
670 return TLS1_AD_PROTOCOL_VERSION;
671
672 case SSL_AD_INSUFFICIENT_SECURITY:
673 return TLS1_AD_INSUFFICIENT_SECURITY;
674
675 case SSL_AD_INTERNAL_ERROR:
676 return TLS1_AD_INTERNAL_ERROR;
677
678 case SSL_AD_USER_CANCELLED:
679 return TLS1_AD_USER_CANCELLED;
680
681 case SSL_AD_NO_RENEGOTIATION:
682 return TLS1_AD_NO_RENEGOTIATION;
683
684 case SSL_AD_UNSUPPORTED_EXTENSION:
685 return TLS1_AD_UNSUPPORTED_EXTENSION;
686
687 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
688 return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
689
690 case SSL_AD_UNRECOGNIZED_NAME:
691 return TLS1_AD_UNRECOGNIZED_NAME;
692
693 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
694 return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
695
696 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
697 return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
698
699 case SSL_AD_UNKNOWN_PSK_IDENTITY:
700 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
701
702 case SSL_AD_INAPPROPRIATE_FALLBACK:
703 return SSL3_AD_INAPPROPRIATE_FALLBACK;
704
705 default:
706 return -1;
707 }
708 }
709