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d02b48c6 1/* ssl/s3_clnt.c */
58964a49 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6
RE		 3 * All rights reserved.
4 *
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.
0f113f3e 8 *
d02b48c6
RE		 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).
0f113f3e 15 *
d02b48c6
RE		 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.
0f113f3e 22 *
d02b48c6
RE		 23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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 :-).
0f113f3e 37 * 4. If you include any Windows specific code (or a derivative thereof) from
d02b48c6
RE		 38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
0f113f3e 40 *
d02b48c6
RE		 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
51 * SUCH DAMAGE.
0f113f3e 52 *
d02b48c6
RE		 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.]
57 */
8c74b5e5 58/* ====================================================================
52b8dad8 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
8c74b5e5
BM		 60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
0f113f3e 66 * notice, this list of conditions and the following disclaimer.
8c74b5e5
BM		 67 *
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
71 * distribution.
72 *
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/)"
77 *
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.
82 *
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.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
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 * ====================================================================
105 *
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).
109 *
110 */
ea262260
BM		 111/* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
0f113f3e 114 * Portions of the attached software ("Contribution") are developed by
ea262260
BM		 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
ea262260
BM		 120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
ddac1974
NL		 124/* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
d02b48c6
RE		 150
151#include <stdio.h>
7b63c0fa 152#include "ssl_locl.h"
ec577822
BM		 153#include <openssl/buffer.h>
154#include <openssl/rand.h>
155#include <openssl/objects.h>
156#include <openssl/evp.h>
dbad1690 157#include <openssl/md5.h>
3eeaab4b 158#ifndef OPENSSL_NO_DH
0f113f3e 159# include <openssl/dh.h>
3eeaab4b 160#endif
d095b68d 161#include <openssl/bn.h>
368888bc 162#ifndef OPENSSL_NO_ENGINE
0f113f3e 163# include <openssl/engine.h>
368888bc 164#endif
f9b3bff6 165
d45ba43d 166static int ssl_set_version(SSL *s);
0f113f3e 167static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
657da85e 168static int ssl3_check_change(SSL *s);
d45ba43d
MC		 169static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
170 unsigned char *p,
171 int (*put_cb) (const SSL_CIPHER *,
172 unsigned char *));
ea262260 173
d02b48c6 174
6b691a5c 175int ssl3_connect(SSL *s)
0f113f3e
MC		 176{
177 BUF_MEM *buf = NULL;
178 unsigned long Time = (unsigned long)time(NULL);
179 void (*cb) (const SSL *ssl, int type, int val) = NULL;
180 int ret = -1;
181 int new_state, state, skip = 0;
d02b48c6 182
0f113f3e
MC		 183 RAND_add(&Time, sizeof(Time), 0);
184 ERR_clear_error();
185 clear_sys_error();
4817504d 186
0f113f3e
MC		 187 if (s->info_callback != NULL)
188 cb = s->info_callback;
189 else if (s->ctx->info_callback != NULL)
190 cb = s->ctx->info_callback;
191
192 s->in_handshake++;
69f68237 193 if (!SSL_in_init(s) || SSL_in_before(s)) {
61986d32 194 if (!SSL_clear(s))
69f68237
MC		 195 return -1;
196 }
0f113f3e
MC		 197
198#ifndef OPENSSL_NO_HEARTBEATS
199 /*
200 * If we're awaiting a HeartbeatResponse, pretend we already got and
201 * don't await it anymore, because Heartbeats don't make sense during
202 * handshakes anyway.
203 */
204 if (s->tlsext_hb_pending) {
205 s->tlsext_hb_pending = 0;
206 s->tlsext_hb_seq++;
207 }
208#endif
209
210 for (;;) {
211 state = s->state;
212
213 switch (s->state) {
214 case SSL_ST_RENEGOTIATE:
215 s->renegotiate = 1;
216 s->state = SSL_ST_CONNECT;
217 s->ctx->stats.sess_connect_renegotiate++;
218 /* break */
219 case SSL_ST_BEFORE:
220 case SSL_ST_CONNECT:
221 case SSL_ST_BEFORE | SSL_ST_CONNECT:
222 case SSL_ST_OK | SSL_ST_CONNECT:
223
224 s->server = 0;
225 if (cb != NULL)
226 cb(s, SSL_CB_HANDSHAKE_START, 1);
227
13c9bb3e
MC		 228 if ((s->version >> 8) != SSL3_VERSION_MAJOR
229 && s->version != TLS_ANY_VERSION) {
0f113f3e 230 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
cc273a93 231 s->state = SSL_ST_ERR;
0f113f3e
MC		 232 ret = -1;
233 goto end;
234 }
235
d45ba43d
MC		 236 if (s->version != TLS_ANY_VERSION &&
237 !ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
0f113f3e
MC		 238 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
239 return -1;
240 }
241
242 /* s->version=SSL3_VERSION; */
243 s->type = SSL_ST_CONNECT;
244
245 if (s->init_buf == NULL) {
246 if ((buf = BUF_MEM_new()) == NULL) {
247 ret = -1;
cc273a93 248 s->state = SSL_ST_ERR;
0f113f3e
MC		 249 goto end;
250 }
251 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
252 ret = -1;
cc273a93 253 s->state = SSL_ST_ERR;
0f113f3e
MC		 254 goto end;
255 }
256 s->init_buf = buf;
257 buf = NULL;
258 }
259
260 if (!ssl3_setup_buffers(s)) {
261 ret = -1;
262 goto end;
263 }
264
265 /* setup buffing BIO */
266 if (!ssl_init_wbio_buffer(s, 0)) {
267 ret = -1;
cc273a93 268 s->state = SSL_ST_ERR;
0f113f3e
MC		 269 goto end;
270 }
271
272 /* don't push the buffering BIO quite yet */
273
274 ssl3_init_finished_mac(s);
275
276 s->state = SSL3_ST_CW_CLNT_HELLO_A;
277 s->ctx->stats.sess_connect++;
278 s->init_num = 0;
0f113f3e
MC		 279 /*
280 * Should have been reset by ssl3_get_finished, too.
281 */
282 s->s3->change_cipher_spec = 0;
283 break;
284
285 case SSL3_ST_CW_CLNT_HELLO_A:
286 case SSL3_ST_CW_CLNT_HELLO_B:
287
288 s->shutdown = 0;
289 ret = ssl3_client_hello(s);
290 if (ret <= 0)
291 goto end;
292 s->state = SSL3_ST_CR_SRVR_HELLO_A;
293 s->init_num = 0;
294
295 /* turn on buffering for the next lot of output */
296 if (s->bbio != s->wbio)
297 s->wbio = BIO_push(s->bbio, s->wbio);
298
299 break;
300
301 case SSL3_ST_CR_SRVR_HELLO_A:
302 case SSL3_ST_CR_SRVR_HELLO_B:
303 ret = ssl3_get_server_hello(s);
304 if (ret <= 0)
305 goto end;
306
307 if (s->hit) {
657da85e 308 s->state = SSL3_ST_CR_CHANGE_A;
0f113f3e
MC		 309 if (s->tlsext_ticket_expected) {
310 /* receive renewed session ticket */
311 s->state = SSL3_ST_CR_SESSION_TICKET_A;
312 }
0f113f3e
MC		 313 } else {
314 s->state = SSL3_ST_CR_CERT_A;
315 }
316 s->init_num = 0;
317 break;
318 case SSL3_ST_CR_CERT_A:
319 case SSL3_ST_CR_CERT_B:
6e3d0153 320 /* Noop (ret = 0) for everything but EAP-FAST. */
657da85e 321 ret = ssl3_check_change(s);
6e3d0153
EK		 322 if (ret < 0)
323 goto end;
324 if (ret == 1) {
325 s->hit = 1;
657da85e 326 s->state = SSL3_ST_CR_CHANGE_A;
6e3d0153
EK		 327 s->init_num = 0;
328 break;
329 }
e481f9b9 330
0f113f3e
MC		 331 /* Check if it is anon DH/ECDH, SRP auth */
332 /* or PSK */
7689082b
DSH		 333 if (!(s->s3->tmp.new_cipher->algorithm_auth &
334 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
0f113f3e
MC		 335 ret = ssl3_get_server_certificate(s);
336 if (ret <= 0)
337 goto end;
e481f9b9 338
0f113f3e
MC		 339 if (s->tlsext_status_expected)
340 s->state = SSL3_ST_CR_CERT_STATUS_A;
341 else
342 s->state = SSL3_ST_CR_KEY_EXCH_A;
343 } else {
344 skip = 1;
345 s->state = SSL3_ST_CR_KEY_EXCH_A;
346 }
0f113f3e 347
0f113f3e
MC		 348 s->init_num = 0;
349 break;
350
351 case SSL3_ST_CR_KEY_EXCH_A:
352 case SSL3_ST_CR_KEY_EXCH_B:
353 ret = ssl3_get_key_exchange(s);
354 if (ret <= 0)
355 goto end;
356 s->state = SSL3_ST_CR_CERT_REQ_A;
357 s->init_num = 0;
358
359 /*
360 * at this point we check that we have the required stuff from
361 * the server
362 */
363 if (!ssl3_check_cert_and_algorithm(s)) {
364 ret = -1;
cc273a93 365 s->state = SSL_ST_ERR;
0f113f3e
MC		 366 goto end;
367 }
368 break;
369
370 case SSL3_ST_CR_CERT_REQ_A:
371 case SSL3_ST_CR_CERT_REQ_B:
372 ret = ssl3_get_certificate_request(s);
373 if (ret <= 0)
374 goto end;
375 s->state = SSL3_ST_CR_SRVR_DONE_A;
376 s->init_num = 0;
377 break;
378
379 case SSL3_ST_CR_SRVR_DONE_A:
380 case SSL3_ST_CR_SRVR_DONE_B:
381 ret = ssl3_get_server_done(s);
382 if (ret <= 0)
383 goto end;
edc032b5 384#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 385 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
386 if ((ret = SRP_Calc_A_param(s)) <= 0) {
387 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC);
388 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
cc273a93 389 s->state = SSL_ST_ERR;
0f113f3e
MC		 390 goto end;
391 }
392 }
393#endif
394 if (s->s3->tmp.cert_req)
395 s->state = SSL3_ST_CW_CERT_A;
396 else
397 s->state = SSL3_ST_CW_KEY_EXCH_A;
398 s->init_num = 0;
399
400 break;
401
402 case SSL3_ST_CW_CERT_A:
403 case SSL3_ST_CW_CERT_B:
404 case SSL3_ST_CW_CERT_C:
405 case SSL3_ST_CW_CERT_D:
406 ret = ssl3_send_client_certificate(s);
407 if (ret <= 0)
408 goto end;
409 s->state = SSL3_ST_CW_KEY_EXCH_A;
410 s->init_num = 0;
411 break;
412
413 case SSL3_ST_CW_KEY_EXCH_A:
414 case SSL3_ST_CW_KEY_EXCH_B:
415 ret = ssl3_send_client_key_exchange(s);
416 if (ret <= 0)
417 goto end;
418 /*
419 * EAY EAY EAY need to check for DH fix cert sent back
420 */
421 /*
422 * For TLS, cert_req is set to 2, so a cert chain of nothing is
423 * sent, but no verify packet is sent
424 */
425 /*
426 * XXX: For now, we do not support client authentication in ECDH
427 * cipher suites with ECDH (rather than ECDSA) certificates. We
428 * need to skip the certificate verify message when client's
429 * ECDH public key is sent inside the client certificate.
430 */
431 if (s->s3->tmp.cert_req == 1) {
432 s->state = SSL3_ST_CW_CERT_VRFY_A;
433 } else {
434 s->state = SSL3_ST_CW_CHANGE_A;
435 }
436 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
437 s->state = SSL3_ST_CW_CHANGE_A;
438 }
439
440 s->init_num = 0;
441 break;
442
443 case SSL3_ST_CW_CERT_VRFY_A:
444 case SSL3_ST_CW_CERT_VRFY_B:
445 ret = ssl3_send_client_verify(s);
446 if (ret <= 0)
447 goto end;
448 s->state = SSL3_ST_CW_CHANGE_A;
449 s->init_num = 0;
450 break;
451
452 case SSL3_ST_CW_CHANGE_A:
453 case SSL3_ST_CW_CHANGE_B:
454 ret = ssl3_send_change_cipher_spec(s,
455 SSL3_ST_CW_CHANGE_A,
456 SSL3_ST_CW_CHANGE_B);
457 if (ret <= 0)
458 goto end;
ee2ffc27 459
e481f9b9 460#if defined(OPENSSL_NO_NEXTPROTONEG)
0f113f3e 461 s->state = SSL3_ST_CW_FINISHED_A;
ee2ffc27 462#else
0f113f3e
MC		 463 if (s->s3->next_proto_neg_seen)
464 s->state = SSL3_ST_CW_NEXT_PROTO_A;
465 else
466 s->state = SSL3_ST_CW_FINISHED_A;
ee2ffc27 467#endif
0f113f3e 468 s->init_num = 0;
d02b48c6 469
0f113f3e 470 s->session->cipher = s->s3->tmp.new_cipher;
09b6c2ef 471#ifdef OPENSSL_NO_COMP
0f113f3e 472 s->session->compress_meth = 0;
09b6c2ef 473#else
0f113f3e
MC		 474 if (s->s3->tmp.new_compression == NULL)
475 s->session->compress_meth = 0;
476 else
477 s->session->compress_meth = s->s3->tmp.new_compression->id;
09b6c2ef 478#endif
0f113f3e
MC		 479 if (!s->method->ssl3_enc->setup_key_block(s)) {
480 ret = -1;
cc273a93 481 s->state = SSL_ST_ERR;
0f113f3e
MC		 482 goto end;
483 }
d02b48c6 484
0f113f3e
MC		 485 if (!s->method->ssl3_enc->change_cipher_state(s,
486 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
487 {
488 ret = -1;
cc273a93 489 s->state = SSL_ST_ERR;
0f113f3e
MC		 490 goto end;
491 }
d02b48c6 492
0f113f3e 493 break;
d02b48c6 494
e481f9b9 495#if !defined(OPENSSL_NO_NEXTPROTONEG)
0f113f3e
MC		 496 case SSL3_ST_CW_NEXT_PROTO_A:
497 case SSL3_ST_CW_NEXT_PROTO_B:
498 ret = ssl3_send_next_proto(s);
499 if (ret <= 0)
500 goto end;
501 s->state = SSL3_ST_CW_FINISHED_A;
502 break;
503#endif
504
505 case SSL3_ST_CW_FINISHED_A:
506 case SSL3_ST_CW_FINISHED_B:
507 ret = ssl3_send_finished(s,
508 SSL3_ST_CW_FINISHED_A,
509 SSL3_ST_CW_FINISHED_B,
510 s->method->
511 ssl3_enc->client_finished_label,
512 s->method->
513 ssl3_enc->client_finished_label_len);
514 if (ret <= 0)
515 goto end;
516 s->state = SSL3_ST_CW_FLUSH;
517
0f113f3e
MC		 518 if (s->hit) {
519 s->s3->tmp.next_state = SSL_ST_OK;
0f113f3e 520 } else {
0f113f3e
MC		 521 /*
522 * Allow NewSessionTicket if ticket expected
523 */
524 if (s->tlsext_ticket_expected)
525 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
526 else
657da85e 527 s->s3->tmp.next_state = SSL3_ST_CR_CHANGE_A;
0f113f3e
MC		 528 }
529 s->init_num = 0;
530 break;
d02b48c6 531
0f113f3e
MC		 532 case SSL3_ST_CR_SESSION_TICKET_A:
533 case SSL3_ST_CR_SESSION_TICKET_B:
534 ret = ssl3_get_new_session_ticket(s);
535 if (ret <= 0)
536 goto end;
657da85e 537 s->state = SSL3_ST_CR_CHANGE_A;
0f113f3e
MC		 538 s->init_num = 0;
539 break;
540
541 case SSL3_ST_CR_CERT_STATUS_A:
542 case SSL3_ST_CR_CERT_STATUS_B:
543 ret = ssl3_get_cert_status(s);
544 if (ret <= 0)
545 goto end;
546 s->state = SSL3_ST_CR_KEY_EXCH_A;
547 s->init_num = 0;
548 break;
0f113f3e 549
657da85e
MC		 550 case SSL3_ST_CR_CHANGE_A:
551 case SSL3_ST_CR_CHANGE_B:
552 ret = ssl3_get_change_cipher_spec(s, SSL3_ST_CR_CHANGE_A,
553 SSL3_ST_CR_CHANGE_B);
554 if (ret <= 0)
555 goto end;
556
557 s->state = SSL3_ST_CR_FINISHED_A;
558 s->init_num = 0;
559 break;
560
0f113f3e
MC		 561 case SSL3_ST_CR_FINISHED_A:
562 case SSL3_ST_CR_FINISHED_B:
0f113f3e
MC		 563 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
564 SSL3_ST_CR_FINISHED_B);
565 if (ret <= 0)
566 goto end;
567
568 if (s->hit)
569 s->state = SSL3_ST_CW_CHANGE_A;
570 else
571 s->state = SSL_ST_OK;
572 s->init_num = 0;
573 break;
574
575 case SSL3_ST_CW_FLUSH:
576 s->rwstate = SSL_WRITING;
577 if (BIO_flush(s->wbio) <= 0) {
578 ret = -1;
579 goto end;
580 }
581 s->rwstate = SSL_NOTHING;
582 s->state = s->s3->tmp.next_state;
583 break;
584
585 case SSL_ST_OK:
586 /* clean a few things up */
587 ssl3_cleanup_key_block(s);
25aaa98a
RS		 588 BUF_MEM_free(s->init_buf);
589 s->init_buf = NULL;
0f113f3e 590
57787ac8
MC		 591 /* remove the buffering */
592 ssl_free_wbio_buffer(s);
0f113f3e
MC		 593
594 s->init_num = 0;
595 s->renegotiate = 0;
596 s->new_session = 0;
597
598 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
599 if (s->hit)
600 s->ctx->stats.sess_hit++;
601
602 ret = 1;
603 /* s->server=0; */
604 s->handshake_func = ssl3_connect;
605 s->ctx->stats.sess_connect_good++;
606
607 if (cb != NULL)
608 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
609
610 goto end;
611 /* break; */
612
cc273a93 613 case SSL_ST_ERR:
0f113f3e
MC		 614 default:
615 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
616 ret = -1;
617 goto end;
618 /* break; */
619 }
620
621 /* did we do anything */
622 if (!s->s3->tmp.reuse_message && !skip) {
623 if (s->debug) {
624 if ((ret = BIO_flush(s->wbio)) <= 0)
625 goto end;
626 }
627
628 if ((cb != NULL) && (s->state != state)) {
629 new_state = s->state;
630 s->state = state;
631 cb(s, SSL_CB_CONNECT_LOOP, 1);
632 s->state = new_state;
633 }
634 }
635 skip = 0;
636 }
637 end:
638 s->in_handshake--;
25aaa98a 639 BUF_MEM_free(buf);
0f113f3e
MC		 640 if (cb != NULL)
641 cb(s, SSL_CB_CONNECT_EXIT, ret);
642 return (ret);
643}
d02b48c6 644
d45ba43d
MC		 645/*
646 * Work out what version we should be using for the initial ClientHello if
647 * the version is currently set to (D)TLS_ANY_VERSION.
648 * Returns 1 on success
649 * Returns 0 on error
650 */
651static int ssl_set_version(SSL *s)
652{
653 unsigned long mask, options = s->options;
654
655 if (s->method->version == TLS_ANY_VERSION) {
656 /*
657 * SSL_OP_NO_X disables all protocols above X *if* there are
658 * some protocols below X enabled. This is required in order
659 * to maintain "version capability" vector contiguous. So
660 * that if application wants to disable TLS1.0 in favour of
661 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
662 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3.
663 */
664 mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1
665#if !defined(OPENSSL_NO_SSL3)
666 | SSL_OP_NO_SSLv3
667#endif
668 ;
669#if !defined(OPENSSL_NO_TLS1_2_CLIENT)
670 if (options & SSL_OP_NO_TLSv1_2) {
671 if ((options & mask) != mask) {
672 s->version = TLS1_1_VERSION;
673 } else {
674 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE);
675 return 0;
676 }
677 } else {
678 s->version = TLS1_2_VERSION;
679 }
680#else
681 if ((options & mask) == mask) {
682 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE);
683 return 0;
684 }
685 s->version = TLS1_1_VERSION;
686#endif
687
688 mask &= ~SSL_OP_NO_TLSv1_1;
689 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
690 s->version = TLS1_VERSION;
691 mask &= ~SSL_OP_NO_TLSv1;
692#if !defined(OPENSSL_NO_SSL3)
693 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
694 s->version = SSL3_VERSION;
695#endif
696
697 if (s->version != TLS1_2_VERSION && tls1_suiteb(s)) {
698 SSLerr(SSL_F_SSL_SET_VERSION,
699 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
700 return 0;
701 }
702
703 if (s->version == SSL3_VERSION && FIPS_mode()) {
704 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
705 return 0;
706 }
707
708 } else if (s->method->version == DTLS_ANY_VERSION) {
709 /* Determine which DTLS version to use */
710 /* If DTLS 1.2 disabled correct the version number */
711 if (options & SSL_OP_NO_DTLSv1_2) {
712 if (tls1_suiteb(s)) {
713 SSLerr(SSL_F_SSL_SET_VERSION,
714 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
715 return 0;
716 }
717 /*
718 * Disabling all versions is silly: return an error.
719 */
720 if (options & SSL_OP_NO_DTLSv1) {
721 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_WRONG_SSL_VERSION);
722 return 0;
723 }
724 /*
725 * Update method so we don't use any DTLS 1.2 features.
726 */
727 s->method = DTLSv1_client_method();
728 s->version = DTLS1_VERSION;
729 } else {
730 /*
731 * We only support one version: update method
732 */
733 if (options & SSL_OP_NO_DTLSv1)
734 s->method = DTLSv1_2_client_method();
735 s->version = DTLS1_2_VERSION;
736 }
737 }
738
739 s->client_version = s->version;
740
741 return 1;
742}
743
36d16f8e 744int ssl3_client_hello(SSL *s)
0f113f3e
MC		 745{
746 unsigned char *buf;
747 unsigned char *p, *d;
748 int i;
749 unsigned long l;
750 int al = 0;
09b6c2ef 751#ifndef OPENSSL_NO_COMP
0f113f3e
MC		 752 int j;
753 SSL_COMP *comp;
754#endif
755
756 buf = (unsigned char *)s->init_buf->data;
757 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
758 SSL_SESSION *sess = s->session;
13c9bb3e 759
d45ba43d
MC		 760 /* Work out what SSL/TLS/DTLS version to use */
761 if (ssl_set_version(s) == 0)
762 goto err;
13c9bb3e
MC		 763
764 if ((sess == NULL) || (sess->ssl_version != s->version) ||
13c9bb3e
MC		 765 /*
766 * In the case of EAP-FAST, we can have a pre-shared
767 * "ticket" without a session ID.
768 */
769 (!sess->session_id_length && !sess->tlsext_tick) ||
13c9bb3e
MC		 770 (sess->not_resumable)) {
771 if (!ssl_get_new_session(s, 0))
772 goto err;
773 }
0f113f3e
MC		 774 /* else use the pre-loaded session */
775
776 p = s->s3->client_random;
777
778 /*
779 * for DTLS if client_random is initialized, reuse it, we are
780 * required to use same upon reply to HelloVerify
781 */
782 if (SSL_IS_DTLS(s)) {
783 size_t idx;
784 i = 1;
785 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
786 if (p[idx]) {
787 i = 0;
788 break;
789 }
790 }
791 } else
792 i = 1;
793
e1b568dd
MC		 794 if (i && ssl_fill_hello_random(s, 0, p,
795 sizeof(s->s3->client_random)) <= 0)
796 goto err;
0f113f3e
MC		 797
798 /* Do the message type and length last */
799 d = p = ssl_handshake_start(s);
800
35a1cc90
MC		 801 /*-
802 * version indicates the negotiated version: for example from
803 * an SSLv2/v3 compatible client hello). The client_version
804 * field is the maximum version we permit and it is also
805 * used in RSA encrypted premaster secrets. Some servers can
806 * choke if we initially report a higher version then
807 * renegotiate to a lower one in the premaster secret. This
808 * didn't happen with TLS 1.0 as most servers supported it
809 * but it can with TLS 1.1 or later if the server only supports
810 * 1.0.
811 *
812 * Possible scenario with previous logic:
813 * 1. Client hello indicates TLS 1.2
814 * 2. Server hello says TLS 1.0
815 * 3. RSA encrypted premaster secret uses 1.2.
816 * 4. Handhaked proceeds using TLS 1.0.
817 * 5. Server sends hello request to renegotiate.
818 * 6. Client hello indicates TLS v1.0 as we now
819 * know that is maximum server supports.
820 * 7. Server chokes on RSA encrypted premaster secret
821 * containing version 1.0.
822 *
823 * For interoperability it should be OK to always use the
824 * maximum version we support in client hello and then rely
825 * on the checking of version to ensure the servers isn't
826 * being inconsistent: for example initially negotiating with
827 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
828 * client_version in client hello and not resetting it to
829 * the negotiated version.
830 */
0f113f3e
MC		 831 *(p++) = s->client_version >> 8;
832 *(p++) = s->client_version & 0xff;
0f113f3e
MC		 833
834 /* Random stuff */
835 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
836 p += SSL3_RANDOM_SIZE;
837
838 /* Session ID */
839 if (s->new_session)
840 i = 0;
841 else
842 i = s->session->session_id_length;
843 *(p++) = i;
844 if (i != 0) {
845 if (i > (int)sizeof(s->session->session_id)) {
846 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
847 goto err;
848 }
849 memcpy(p, s->session->session_id, i);
850 p += i;
851 }
852
853 /* cookie stuff for DTLS */
854 if (SSL_IS_DTLS(s)) {
855 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
856 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
857 goto err;
858 }
859 *(p++) = s->d1->cookie_len;
860 memcpy(p, s->d1->cookie, s->d1->cookie_len);
861 p += s->d1->cookie_len;
862 }
863
864 /* Ciphers supported */
865 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
866 if (i == 0) {
867 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
868 goto err;
869 }
800e1cd9 870#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
0f113f3e
MC		 871 /*
872 * Some servers hang if client hello > 256 bytes as hack workaround
873 * chop number of supported ciphers to keep it well below this if we
874 * use TLS v1.2
875 */
876 if (TLS1_get_version(s) >= TLS1_2_VERSION
877 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
878 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
879#endif
880 s2n(i, p);
881 p += i;
882
883 /* COMPRESSION */
09b6c2ef 884#ifdef OPENSSL_NO_COMP
0f113f3e 885 *(p++) = 1;
09b6c2ef 886#else
566dda07 887
0f113f3e
MC		 888 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
889 j = 0;
890 else
891 j = sk_SSL_COMP_num(s->ctx->comp_methods);
892 *(p++) = 1 + j;
893 for (i = 0; i < j; i++) {
894 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
895 *(p++) = comp->id;
896 }
09b6c2ef 897#endif
0f113f3e 898 *(p++) = 0; /* Add the NULL method */
761772d7 899
0f113f3e
MC		 900 /* TLS extensions */
901 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
902 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
903 goto err;
904 }
905 if ((p =
906 ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
907 &al)) == NULL) {
908 ssl3_send_alert(s, SSL3_AL_FATAL, al);
909 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
910 goto err;
911 }
0f113f3e
MC		 912
913 l = p - d;
61986d32 914 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l)) {
77d514c5
MC		 915 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
916 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
917 goto err;
918 }
0f113f3e
MC		 919 s->state = SSL3_ST_CW_CLNT_HELLO_B;
920 }
921
922 /* SSL3_ST_CW_CLNT_HELLO_B */
923 return ssl_do_write(s);
924 err:
cc273a93 925 s->state = SSL_ST_ERR;
0f113f3e
MC		 926 return (-1);
927}
d02b48c6 928
36d16f8e 929int ssl3_get_server_hello(SSL *s)
0f113f3e
MC		 930{
931 STACK_OF(SSL_CIPHER) *sk;
932 const SSL_CIPHER *c;
0f113f3e
MC		 933 unsigned char *p, *d;
934 int i, al = SSL_AD_INTERNAL_ERROR, ok;
935 unsigned int j;
936 long n;
09b6c2ef 937#ifndef OPENSSL_NO_COMP
0f113f3e
MC		 938 SSL_COMP *comp;
939#endif
940 /*
941 * Hello verify request and/or server hello version may not match so set
942 * first packet if we're negotiating version.
943 */
81fc390f 944 s->first_packet = 1;
0f113f3e
MC		 945
946 n = s->method->ssl_get_message(s,
947 SSL3_ST_CR_SRVR_HELLO_A,
948 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
949
950 if (!ok)
951 return ((int)n);
952
81fc390f 953 s->first_packet = 0;
0f113f3e 954 if (SSL_IS_DTLS(s)) {
0f113f3e
MC		 955 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
956 if (s->d1->send_cookie == 0) {
957 s->s3->tmp.reuse_message = 1;
958 return 1;
959 } else { /* already sent a cookie */
960
961 al = SSL_AD_UNEXPECTED_MESSAGE;
962 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
963 goto f_err;
964 }
965 }
966 }
967
968 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
969 al = SSL_AD_UNEXPECTED_MESSAGE;
970 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
971 goto f_err;
972 }
973
974 d = p = (unsigned char *)s->init_msg;
13c9bb3e
MC		 975
976 if (s->method->version == TLS_ANY_VERSION) {
977 int sversion = (p[0] << 8) | p[1];
978
979#if TLS_MAX_VERSION != TLS1_2_VERSION
980#error Code needs updating for new TLS version
981#endif
982#ifndef OPENSSL_NO_SSL3
983 if ((sversion == SSL3_VERSION) && !(s->options & SSL_OP_NO_SSLv3)) {
984 if (FIPS_mode()) {
985 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
986 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
d45ba43d
MC		 987 al = SSL_AD_PROTOCOL_VERSION;
988 goto f_err;
13c9bb3e
MC		 989 }
990 s->method = SSLv3_client_method();
991 } else
992#endif
993 if ((sversion == TLS1_VERSION) && !(s->options & SSL_OP_NO_TLSv1)) {
994 s->method = TLSv1_client_method();
995 } else if ((sversion == TLS1_1_VERSION) &&
996 !(s->options & SSL_OP_NO_TLSv1_1)) {
997 s->method = TLSv1_1_client_method();
998 } else if ((sversion == TLS1_2_VERSION) &&
999 !(s->options & SSL_OP_NO_TLSv1_2)) {
1000 s->method = TLSv1_2_client_method();
1001 } else {
1002 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
d45ba43d
MC		 1003 al = SSL_AD_PROTOCOL_VERSION;
1004 goto f_err;
13c9bb3e
MC		 1005 }
1006 s->session->ssl_version = s->version = s->method->version;
1007
1008 if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
1009 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_VERSION_TOO_LOW);
d45ba43d
MC		 1010 al = SSL_AD_PROTOCOL_VERSION;
1011 goto f_err;
13c9bb3e
MC		 1012 }
1013 } else if (s->method->version == DTLS_ANY_VERSION) {
0f113f3e
MC		 1014 /* Work out correct protocol version to use */
1015 int hversion = (p[0] << 8) | p[1];
1016 int options = s->options;
1017 if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2))
1018 s->method = DTLSv1_2_client_method();
1019 else if (tls1_suiteb(s)) {
1020 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1021 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1022 s->version = hversion;
1023 al = SSL_AD_PROTOCOL_VERSION;
1024 goto f_err;
1025 } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1))
1026 s->method = DTLSv1_client_method();
1027 else {
1028 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
1029 s->version = hversion;
1030 al = SSL_AD_PROTOCOL_VERSION;
1031 goto f_err;
1032 }
7322abf5 1033 s->session->ssl_version = s->version = s->method->version;
13c9bb3e 1034 } else if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
0f113f3e
MC		 1035 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
1036 s->version = (s->version & 0xff00) | p[1];
1037 al = SSL_AD_PROTOCOL_VERSION;
1038 goto f_err;
1039 }
1040 p += 2;
1041
1042 /* load the server hello data */
1043 /* load the server random */
1044 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
1045 p += SSL3_RANDOM_SIZE;
1046
1047 s->hit = 0;
1048
1049 /* get the session-id */
1050 j = *(p++);
1051
1052 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
1053 al = SSL_AD_ILLEGAL_PARAMETER;
1054 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
1055 goto f_err;
1056 }
e481f9b9 1057
0f113f3e 1058 /*
6e3d0153
EK		 1059 * Check if we can resume the session based on external pre-shared secret.
1060 * EAP-FAST (RFC 4851) supports two types of session resumption.
1061 * Resumption based on server-side state works with session IDs.
1062 * Resumption based on pre-shared Protected Access Credentials (PACs)
1063 * works by overriding the SessionTicket extension at the application
1064 * layer, and does not send a session ID. (We do not know whether EAP-FAST
1065 * servers would honour the session ID.) Therefore, the session ID alone
1066 * is not a reliable indicator of session resumption, so we first check if
1067 * we can resume, and later peek at the next handshake message to see if the
1068 * server wants to resume.
0f113f3e 1069 */
6e3d0153
EK		 1070 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb &&
1071 s->session->tlsext_tick) {
0f113f3e
MC		 1072 SSL_CIPHER *pref_cipher = NULL;
1073 s->session->master_key_length = sizeof(s->session->master_key);
1074 if (s->tls_session_secret_cb(s, s->session->master_key,
1075 &s->session->master_key_length,
1076 NULL, &pref_cipher,
1077 s->tls_session_secret_cb_arg)) {
1078 s->session->cipher = pref_cipher ?
1079 pref_cipher : ssl_get_cipher_by_char(s, p + j);
6e3d0153
EK		 1080 } else {
1081 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1082 al = SSL_AD_INTERNAL_ERROR;
1083 goto f_err;
0f113f3e
MC		 1084 }
1085 }
0f113f3e 1086
6e3d0153 1087 if (j != 0 && j == s->session->session_id_length
0f113f3e
MC		 1088 && memcmp(p, s->session->session_id, j) == 0) {
1089 if (s->sid_ctx_length != s->session->sid_ctx_length
1090 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
1091 /* actually a client application bug */
1092 al = SSL_AD_ILLEGAL_PARAMETER;
1093 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1094 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1095 goto f_err;
1096 }
1097 s->hit = 1;
6e3d0153 1098 } else {
0f113f3e 1099 /*
6e3d0153
EK		 1100 * If we were trying for session-id reuse but the server
1101 * didn't echo the ID, make a new SSL_SESSION.
1102 * In the case of EAP-FAST and PAC, we do not send a session ID,
1103 * so the PAC-based session secret is always preserved. It'll be
1104 * overwritten if the server refuses resumption.
0f113f3e
MC		 1105 */
1106 if (s->session->session_id_length > 0) {
1107 if (!ssl_get_new_session(s, 0)) {
1108 goto f_err;
1109 }
1110 }
1111 s->session->session_id_length = j;
1112 memcpy(s->session->session_id, p, j); /* j could be 0 */
1113 }
1114 p += j;
1115 c = ssl_get_cipher_by_char(s, p);
1116 if (c == NULL) {
1117 /* unknown cipher */
1118 al = SSL_AD_ILLEGAL_PARAMETER;
1119 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
1120 goto f_err;
1121 }
1122 /* Set version disabled mask now we know version */
1123 if (!SSL_USE_TLS1_2_CIPHERS(s))
4d69f9e6 1124 s->s3->tmp.mask_ssl = SSL_TLSV1_2;
0f113f3e 1125 else
4d69f9e6 1126 s->s3->tmp.mask_ssl = 0;
0f113f3e
MC		 1127 /*
1128 * If it is a disabled cipher we didn't send it in client hello, so
1129 * return an error.
1130 */
1131 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) {
1132 al = SSL_AD_ILLEGAL_PARAMETER;
1133 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1134 goto f_err;
1135 }
1136 p += ssl_put_cipher_by_char(s, NULL, NULL);
1137
1138 sk = ssl_get_ciphers_by_id(s);
1139 i = sk_SSL_CIPHER_find(sk, c);
1140 if (i < 0) {
1141 /* we did not say we would use this cipher */
1142 al = SSL_AD_ILLEGAL_PARAMETER;
1143 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1144 goto f_err;
1145 }
1146
1147 /*
1148 * Depending on the session caching (internal/external), the cipher
1149 * and/or cipher_id values may not be set. Make sure that cipher_id is
1150 * set and use it for comparison.
1151 */
1152 if (s->session->cipher)
1153 s->session->cipher_id = s->session->cipher->id;
1154 if (s->hit && (s->session->cipher_id != c->id)) {
9e9858d1
RS		 1155 al = SSL_AD_ILLEGAL_PARAMETER;
1156 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1157 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1158 goto f_err;
0f113f3e
MC		 1159 }
1160 s->s3->tmp.new_cipher = c;
1161 /*
1162 * Don't digest cached records if no sigalgs: we may need them for client
1163 * authentication.
1164 */
124037fd 1165 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s, 0))
0f113f3e
MC		 1166 goto f_err;
1167 /* lets get the compression algorithm */
1168 /* COMPRESSION */
09b6c2ef 1169#ifdef OPENSSL_NO_COMP
0f113f3e
MC		 1170 if (*(p++) != 0) {
1171 al = SSL_AD_ILLEGAL_PARAMETER;
1172 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1173 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1174 goto f_err;
1175 }
1176 /*
1177 * If compression is disabled we'd better not try to resume a session
1178 * using compression.
1179 */
1180 if (s->session->compress_meth != 0) {
1181 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1182 goto f_err;
1183 }
09b6c2ef 1184#else
0f113f3e
MC		 1185 j = *(p++);
1186 if (s->hit && j != s->session->compress_meth) {
1187 al = SSL_AD_ILLEGAL_PARAMETER;
1188 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1189 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1190 goto f_err;
1191 }
1192 if (j == 0)
1193 comp = NULL;
1194 else if (!ssl_allow_compression(s)) {
1195 al = SSL_AD_ILLEGAL_PARAMETER;
1196 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
1197 goto f_err;
1198 } else
1199 comp = ssl3_comp_find(s->ctx->comp_methods, j);
1200
1201 if ((j != 0) && (comp == NULL)) {
1202 al = SSL_AD_ILLEGAL_PARAMETER;
1203 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1204 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1205 goto f_err;
1206 } else {
1207 s->s3->tmp.new_compression = comp;
1208 }
09b6c2ef 1209#endif
761772d7 1210
0f113f3e
MC		 1211 /* TLS extensions */
1212 if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) {
1213 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
1214 goto err;
1215 }
0f113f3e
MC		 1216
1217 if (p != (d + n)) {
1218 /* wrong packet length */
1219 al = SSL_AD_DECODE_ERROR;
1220 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
1221 goto f_err;
1222 }
1223
1224 return (1);
1225 f_err:
1226 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1227 err:
cc273a93 1228 s->state = SSL_ST_ERR;
0f113f3e
MC		 1229 return (-1);
1230}
d02b48c6 1231
36d16f8e 1232int ssl3_get_server_certificate(SSL *s)
0f113f3e 1233{
55a9a16f 1234 int al, i, ok, ret = -1, exp_idx;
0f113f3e
MC		 1235 unsigned long n, nc, llen, l;
1236 X509 *x = NULL;
1237 const unsigned char *q, *p;
1238 unsigned char *d;
1239 STACK_OF(X509) *sk = NULL;
0f113f3e 1240 EVP_PKEY *pkey = NULL;
0f113f3e
MC		 1241
1242 n = s->method->ssl_get_message(s,
1243 SSL3_ST_CR_CERT_A,
1244 SSL3_ST_CR_CERT_B,
1245 -1, s->max_cert_list, &ok);
1246
1247 if (!ok)
1248 return ((int)n);
1249
55a9a16f 1250 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) {
0f113f3e
MC		 1251 s->s3->tmp.reuse_message = 1;
1252 return (1);
1253 }
1254
1255 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1256 al = SSL_AD_UNEXPECTED_MESSAGE;
1257 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
1258 goto f_err;
1259 }
1260 p = d = (unsigned char *)s->init_msg;
1261
1262 if ((sk = sk_X509_new_null()) == NULL) {
1263 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
cc273a93 1264 goto err;
0f113f3e
MC		 1265 }
1266
1267 n2l3(p, llen);
1268 if (llen + 3 != n) {
1269 al = SSL_AD_DECODE_ERROR;
1270 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
1271 goto f_err;
1272 }
1273 for (nc = 0; nc < llen;) {
1274 n2l3(p, l);
1275 if ((l + nc + 3) > llen) {
1276 al = SSL_AD_DECODE_ERROR;
1277 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1278 SSL_R_CERT_LENGTH_MISMATCH);
1279 goto f_err;
1280 }
1281
1282 q = p;
1283 x = d2i_X509(NULL, &q, l);
1284 if (x == NULL) {
1285 al = SSL_AD_BAD_CERTIFICATE;
1286 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
1287 goto f_err;
1288 }
1289 if (q != (p + l)) {
1290 al = SSL_AD_DECODE_ERROR;
1291 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1292 SSL_R_CERT_LENGTH_MISMATCH);
1293 goto f_err;
1294 }
1295 if (!sk_X509_push(sk, x)) {
1296 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
cc273a93 1297 goto err;
0f113f3e
MC		 1298 }
1299 x = NULL;
1300 nc += l + 3;
1301 p = q;
1302 }
1303
1304 i = ssl_verify_cert_chain(s, sk);
55a9a16f 1305 if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) {
0f113f3e
MC		 1306 al = ssl_verify_alarm_type(s->verify_result);
1307 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1308 SSL_R_CERTIFICATE_VERIFY_FAILED);
1309 goto f_err;
1310 }
1311 ERR_clear_error(); /* but we keep s->verify_result */
1312 if (i > 1) {
1313 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1314 al = SSL_AD_HANDSHAKE_FAILURE;
1315 goto f_err;
1316 }
1317
c34b0f99 1318 s->session->peer_chain = sk;
0f113f3e
MC		 1319 /*
1320 * Inconsistency alert: cert_chain does include the peer's certificate,
1321 * which we don't include in s3_srvr.c
1322 */
1323 x = sk_X509_value(sk, 0);
1324 sk = NULL;
1325 /*
1326 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1327 */
1328
1329 pkey = X509_get_pubkey(x);
1330
55a9a16f 1331 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
0f113f3e
MC		 1332 x = NULL;
1333 al = SSL3_AL_FATAL;
1334 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1335 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1336 goto f_err;
1337 }
1338
1339 i = ssl_cert_type(x, pkey);
55a9a16f 1340 if (i < 0) {
0f113f3e
MC		 1341 x = NULL;
1342 al = SSL3_AL_FATAL;
1343 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1344 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1345 goto f_err;
1346 }
1347
55a9a16f
MC		 1348 exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1349 if (exp_idx >= 0 && i != exp_idx) {
1350 x = NULL;
1351 al = SSL_AD_ILLEGAL_PARAMETER;
1352 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1353 SSL_R_WRONG_CERTIFICATE_TYPE);
1354 goto f_err;
0f113f3e 1355 }
a273c6ee 1356 s->session->peer_type = i;
55a9a16f
MC		 1357
1358 X509_free(s->session->peer);
1359 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1360 s->session->peer = x;
0f113f3e
MC		 1361 s->session->verify_result = s->verify_result;
1362
1363 x = NULL;
1364 ret = 1;
66696478
RS		 1365 goto done;
1366
0f113f3e 1367 f_err:
66696478 1368 ssl3_send_alert(s, SSL3_AL_FATAL, al);
cc273a93
MC		 1369 err:
1370 s->state = SSL_ST_ERR;
66696478 1371 done:
0f113f3e
MC		 1372 EVP_PKEY_free(pkey);
1373 X509_free(x);
1374 sk_X509_pop_free(sk, X509_free);
1375 return (ret);
1376}
d02b48c6 1377
36d16f8e 1378int ssl3_get_key_exchange(SSL *s)
0f113f3e 1379{
bc36ee62 1380#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 1381 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1382#endif
1383 EVP_MD_CTX md_ctx;
1384 unsigned char *param, *p;
1385 int al, j, ok;
1386 long i, param_len, n, alg_k, alg_a;
1387 EVP_PKEY *pkey = NULL;
1388 const EVP_MD *md = NULL;
bc36ee62 1389#ifndef OPENSSL_NO_RSA
0f113f3e 1390 RSA *rsa = NULL;
79df9d62 1391#endif
bc36ee62 1392#ifndef OPENSSL_NO_DH
0f113f3e 1393 DH *dh = NULL;
58964a49 1394#endif
10bf4fc2 1395#ifndef OPENSSL_NO_EC
0f113f3e
MC		 1396 EC_KEY *ecdh = NULL;
1397 BN_CTX *bn_ctx = NULL;
1398 EC_POINT *srvr_ecpoint = NULL;
1399 int curve_nid = 0;
1400 int encoded_pt_len = 0;
1401#endif
1402
1403 EVP_MD_CTX_init(&md_ctx);
1404
1405 /*
1406 * use same message size as in ssl3_get_certificate_request() as
1407 * ServerKeyExchange message may be skipped
1408 */
1409 n = s->method->ssl_get_message(s,
1410 SSL3_ST_CR_KEY_EXCH_A,
1411 SSL3_ST_CR_KEY_EXCH_B,
1412 -1, s->max_cert_list, &ok);
1413 if (!ok)
1414 return ((int)n);
1415
1416 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1417
1418 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1419 /*
1420 * Can't skip server key exchange if this is an ephemeral
1421 * ciphersuite.
1422 */
7689082b 1423 if (alg_k & (SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK)) {
0f113f3e
MC		 1424 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1425 al = SSL_AD_UNEXPECTED_MESSAGE;
1426 goto f_err;
1427 }
a16ca4e8 1428
0f113f3e
MC		 1429 s->s3->tmp.reuse_message = 1;
1430 return (1);
1431 }
1432
1433 param = p = (unsigned char *)s->init_msg;
8d92c1f8 1434
bc36ee62 1435#ifndef OPENSSL_NO_RSA
8d92c1f8
DSH		 1436 RSA_free(s->s3->peer_rsa_tmp);
1437 s->s3->peer_rsa_tmp = NULL;
d02b48c6 1438#endif
bc36ee62 1439#ifndef OPENSSL_NO_DH
8d92c1f8
DSH		 1440 DH_free(s->s3->peer_dh_tmp);
1441 s->s3->peer_dh_tmp = NULL;
ea262260 1442#endif
10bf4fc2 1443#ifndef OPENSSL_NO_EC
8d92c1f8
DSH		 1444 EC_KEY_free(s->s3->peer_ecdh_tmp);
1445 s->s3->peer_ecdh_tmp = NULL;
d02b48c6 1446#endif
8d92c1f8 1447
0f113f3e
MC		 1448 /* Total length of the parameters including the length prefix */
1449 param_len = 0;
f2be92b9 1450
0f113f3e 1451 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
d02b48c6 1452
0f113f3e 1453 al = SSL_AD_DECODE_ERROR;
f2be92b9 1454
ddac1974 1455#ifndef OPENSSL_NO_PSK
7689082b
DSH		 1456 /* PSK ciphersuites are preceded by an identity hint */
1457 if (alg_k & SSL_PSK) {
0f113f3e
MC		 1458
1459 param_len = 2;
1460 if (param_len > n) {
1461 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1462 goto f_err;
1463 }
1464 n2s(p, i);
1465
1466 /*
1467 * Store PSK identity hint for later use, hint is used in
1468 * ssl3_send_client_key_exchange. Assume that the maximum length of
1469 * a PSK identity hint can be as long as the maximum length of a PSK
1470 * identity.
1471 */
1472 if (i > PSK_MAX_IDENTITY_LEN) {
1473 al = SSL_AD_HANDSHAKE_FAILURE;
1474 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
1475 goto f_err;
1476 }
1477 if (i > n - param_len) {
1478 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1479 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1480 goto f_err;
1481 }
1482 param_len += i;
1483
a16ca4e8 1484 OPENSSL_free(s->session->psk_identity_hint);
7689082b
DSH		 1485 if (i != 0) {
1486 s->session->psk_identity_hint = BUF_strndup((char *)p, i);
1487 if (s->session->psk_identity_hint == NULL) {
1488 al = SSL_AD_HANDSHAKE_FAILURE;
1489 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1490 goto f_err;
1491 }
1492 } else {
1493 s->session->psk_identity_hint = NULL;
0f113f3e
MC		 1494 }
1495
1496 p += i;
1497 n -= param_len;
7689082b
DSH		 1498 }
1499
1500 /* Nothing else to do for plain PSK or RSAPSK */
1501 if (alg_k & (SSL_kPSK | SSL_kRSAPSK)) {
0f113f3e
MC		 1502 } else
1503#endif /* !OPENSSL_NO_PSK */
edc032b5 1504#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 1505 if (alg_k & SSL_kSRP) {
1506 param_len = 2;
1507 if (param_len > n) {
1508 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1509 goto f_err;
1510 }
1511 n2s(p, i);
1512
1513 if (i > n - param_len) {
1514 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
1515 goto f_err;
1516 }
1517 param_len += i;
1518
75ebbd9a 1519 if ((s->srp_ctx.N = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 1520 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1521 goto err;
1522 }
1523 p += i;
1524
1525 if (2 > n - param_len) {
1526 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1527 goto f_err;
1528 }
1529 param_len += 2;
1530
1531 n2s(p, i);
1532
1533 if (i > n - param_len) {
1534 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
1535 goto f_err;
1536 }
1537 param_len += i;
1538
75ebbd9a 1539 if ((s->srp_ctx.g = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 1540 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1541 goto err;
1542 }
1543 p += i;
1544
1545 if (1 > n - param_len) {
1546 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1547 goto f_err;
1548 }
1549 param_len += 1;
1550
1551 i = (unsigned int)(p[0]);
1552 p++;
1553
1554 if (i > n - param_len) {
1555 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
1556 goto f_err;
1557 }
1558 param_len += i;
1559
75ebbd9a 1560 if ((s->srp_ctx.s = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 1561 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1562 goto err;
1563 }
1564 p += i;
1565
1566 if (2 > n - param_len) {
1567 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1568 goto f_err;
1569 }
1570 param_len += 2;
1571
1572 n2s(p, i);
1573
1574 if (i > n - param_len) {
1575 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
1576 goto f_err;
1577 }
1578 param_len += i;
1579
75ebbd9a 1580 if ((s->srp_ctx.B = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 1581 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1582 goto err;
1583 }
1584 p += i;
1585 n -= param_len;
1586
1587 if (!srp_verify_server_param(s, &al)) {
1588 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
1589 goto f_err;
1590 }
0989790b 1591
edc032b5 1592/* We must check if there is a certificate */
8df53b7a 1593 if (alg_a & (SSL_aRSA|SSL_aDSS))
a273c6ee 1594 pkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 1595 } else
1596#endif /* !OPENSSL_NO_SRP */
edc032b5 1597#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 1598 if (alg_k & SSL_kRSA) {
1599 /* Temporary RSA keys only allowed in export ciphersuites */
1600 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1601 al = SSL_AD_UNEXPECTED_MESSAGE;
1602 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1603 goto f_err;
1604 }
1605 if ((rsa = RSA_new()) == NULL) {
1606 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1607 goto err;
1608 }
1609
1610 param_len = 2;
1611 if (param_len > n) {
1612 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1613 goto f_err;
1614 }
1615 n2s(p, i);
1616
1617 if (i > n - param_len) {
1618 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1619 goto f_err;
1620 }
1621 param_len += i;
1622
75ebbd9a 1623 if ((rsa->n = BN_bin2bn(p, i, rsa->n)) == NULL) {
0f113f3e
MC		 1624 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1625 goto err;
1626 }
1627 p += i;
1628
1629 if (2 > n - param_len) {
1630 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1631 goto f_err;
1632 }
1633 param_len += 2;
1634
1635 n2s(p, i);
1636
1637 if (i > n - param_len) {
1638 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1639 goto f_err;
1640 }
1641 param_len += i;
1642
75ebbd9a 1643 if ((rsa->e = BN_bin2bn(p, i, rsa->e)) == NULL) {
0f113f3e
MC		 1644 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1645 goto err;
1646 }
1647 p += i;
1648 n -= param_len;
1649
1650 /* this should be because we are using an export cipher */
1651 if (alg_a & SSL_aRSA)
a273c6ee 1652 pkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 1653 else {
1654 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1655 goto err;
1656 }
1dece951
KR		 1657
1658 if (EVP_PKEY_bits(pkey) <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
1659 al = SSL_AD_UNEXPECTED_MESSAGE;
1660 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1661 goto f_err;
1662 }
1663
8d92c1f8 1664 s->s3->peer_rsa_tmp = rsa;
0f113f3e
MC		 1665 rsa = NULL;
1666 }
1667#else /* OPENSSL_NO_RSA */
1668 if (0) ;
d02b48c6 1669#endif
bc36ee62 1670#ifndef OPENSSL_NO_DH
7689082b 1671 else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
0f113f3e
MC		 1672 if ((dh = DH_new()) == NULL) {
1673 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1674 goto err;
1675 }
1676
1677 param_len = 2;
1678 if (param_len > n) {
1679 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1680 goto f_err;
1681 }
1682 n2s(p, i);
1683
1684 if (i > n - param_len) {
1685 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1686 goto f_err;
1687 }
1688 param_len += i;
1689
75ebbd9a 1690 if ((dh->p = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 1691 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1692 goto err;
1693 }
1694 p += i;
1695
1696 if (2 > n - param_len) {
1697 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1698 goto f_err;
1699 }
1700 param_len += 2;
1701
1702 n2s(p, i);
1703
1704 if (i > n - param_len) {
1705 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1706 goto f_err;
1707 }
1708 param_len += i;
1709
75ebbd9a 1710 if ((dh->g = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 1711 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1712 goto err;
1713 }
1714 p += i;
1715
1716 if (2 > n - param_len) {
1717 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1718 goto f_err;
1719 }
1720 param_len += 2;
1721
1722 n2s(p, i);
1723
1724 if (i > n - param_len) {
1725 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1726 goto f_err;
1727 }
1728 param_len += i;
1729
75ebbd9a 1730 if ((dh->pub_key = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 1731 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1732 goto err;
1733 }
1734 p += i;
1735 n -= param_len;
1736
1737 if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) {
1738 al = SSL_AD_HANDSHAKE_FAILURE;
1739 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DH_KEY_TOO_SMALL);
1740 goto f_err;
1741 }
8df53b7a 1742 if (alg_a & (SSL_aRSA|SSL_aDSS))
a273c6ee 1743 pkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 1744 /* else anonymous DH, so no certificate or pkey. */
1745
8d92c1f8 1746 s->s3->peer_dh_tmp = dh;
0f113f3e 1747 dh = NULL;
0f113f3e
MC		 1748 }
1749#endif /* !OPENSSL_NO_DH */
ea262260 1750
10bf4fc2 1751#ifndef OPENSSL_NO_EC
7689082b 1752 else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
0f113f3e
MC		 1753 EC_GROUP *ngroup;
1754 const EC_GROUP *group;
1755
1756 if ((ecdh = EC_KEY_new()) == NULL) {
1757 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1758 goto err;
1759 }
1760
1761 /*
1762 * Extract elliptic curve parameters and the server's ephemeral ECDH
1763 * public key. Keep accumulating lengths of various components in
1764 * param_len and make sure it never exceeds n.
1765 */
1766
1767 /*
1768 * XXX: For now we only support named (not generic) curves and the
1769 * ECParameters in this case is just three bytes. We also need one
1770 * byte for the length of the encoded point
1771 */
1772 param_len = 4;
1773 if (param_len > n) {
1774 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1775 goto f_err;
1776 }
1777 /*
1778 * Check curve is one of our preferences, if not server has sent an
1779 * invalid curve. ECParameters is 3 bytes.
1780 */
1781 if (!tls1_check_curve(s, p, 3)) {
1782 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
1783 goto f_err;
1784 }
1785
1786 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) {
1787 al = SSL_AD_INTERNAL_ERROR;
1788 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1789 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1790 goto f_err;
1791 }
1792
1793 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1794 if (ngroup == NULL) {
1795 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1796 goto err;
1797 }
1798 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1799 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1800 goto err;
1801 }
1802 EC_GROUP_free(ngroup);
1803
1804 group = EC_KEY_get0_group(ecdh);
1805
1806 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1807 (EC_GROUP_get_degree(group) > 163)) {
1808 al = SSL_AD_EXPORT_RESTRICTION;
1809 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1810 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1811 goto f_err;
1812 }
1813
1814 p += 3;
1815
1816 /* Next, get the encoded ECPoint */
1817 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1818 ((bn_ctx = BN_CTX_new()) == NULL)) {
1819 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1820 goto err;
1821 }
1822
1823 encoded_pt_len = *p; /* length of encoded point */
1824 p += 1;
1825
1826 if ((encoded_pt_len > n - param_len) ||
1827 (EC_POINT_oct2point(group, srvr_ecpoint,
1828 p, encoded_pt_len, bn_ctx) == 0)) {
1829 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1830 goto f_err;
1831 }
1832 param_len += encoded_pt_len;
1833
1834 n -= param_len;
1835 p += encoded_pt_len;
1836
1837 /*
1838 * The ECC/TLS specification does not mention the use of DSA to sign
1839 * ECParameters in the server key exchange message. We do support RSA
1840 * and ECDSA.
1841 */
1842 if (0) ;
1843# ifndef OPENSSL_NO_RSA
1844 else if (alg_a & SSL_aRSA)
a273c6ee 1845 pkey = X509_get_pubkey(s->session->peer);
0f113f3e 1846# endif
10bf4fc2 1847# ifndef OPENSSL_NO_EC
0f113f3e 1848 else if (alg_a & SSL_aECDSA)
a273c6ee 1849 pkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 1850# endif
1851 /* else anonymous ECDH, so no certificate or pkey. */
1852 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
8d92c1f8 1853 s->s3->peer_ecdh_tmp = ecdh;
0f113f3e
MC		 1854 ecdh = NULL;
1855 BN_CTX_free(bn_ctx);
1856 bn_ctx = NULL;
1857 EC_POINT_free(srvr_ecpoint);
1858 srvr_ecpoint = NULL;
1859 } else if (alg_k) {
1860 al = SSL_AD_UNEXPECTED_MESSAGE;
1861 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1862 goto f_err;
1863 }
10bf4fc2 1864#endif /* !OPENSSL_NO_EC */
0f113f3e
MC		 1865
1866 /* p points to the next byte, there are 'n' bytes left */
1867
1868 /* if it was signed, check the signature */
1869 if (pkey != NULL) {
1870 if (SSL_USE_SIGALGS(s)) {
1871 int rv;
1872 if (2 > n) {
1873 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1874 goto f_err;
1875 }
1876 rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1877 if (rv == -1)
1878 goto err;
1879 else if (rv == 0) {
1880 goto f_err;
1881 }
a2f9200f 1882#ifdef SSL_DEBUG
0f113f3e
MC		 1883 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1884#endif
1885 p += 2;
1886 n -= 2;
1887 } else
1888 md = EVP_sha1();
1889
1890 if (2 > n) {
1891 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1892 goto f_err;
1893 }
1894 n2s(p, i);
1895 n -= 2;
1896 j = EVP_PKEY_size(pkey);
1897
1898 /*
1899 * Check signature length. If n is 0 then signature is empty
1900 */
1901 if ((i != n) || (n > j) || (n <= 0)) {
1902 /* wrong packet length */
1903 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1904 goto f_err;
1905 }
bc36ee62 1906#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 1907 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
1908 int num;
1909 unsigned int size;
1910
1911 j = 0;
1912 q = md_buf;
1913 for (num = 2; num > 0; num--) {
1914 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1915 EVP_DigestInit_ex(&md_ctx, (num == 2)
1916 ? s->ctx->md5 : s->ctx->sha1, NULL);
1917 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1918 SSL3_RANDOM_SIZE);
1919 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1920 SSL3_RANDOM_SIZE);
1921 EVP_DigestUpdate(&md_ctx, param, param_len);
1922 EVP_DigestFinal_ex(&md_ctx, q, &size);
1923 q += size;
1924 j += size;
1925 }
1926 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
1927 if (i < 0) {
1928 al = SSL_AD_DECRYPT_ERROR;
1929 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
1930 goto f_err;
1931 }
1932 if (i == 0) {
1933 /* bad signature */
1934 al = SSL_AD_DECRYPT_ERROR;
1935 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1936 goto f_err;
1937 }
1938 } else
1939#endif
1940 {
1941 EVP_VerifyInit_ex(&md_ctx, md, NULL);
1942 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1943 SSL3_RANDOM_SIZE);
1944 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1945 SSL3_RANDOM_SIZE);
1946 EVP_VerifyUpdate(&md_ctx, param, param_len);
1947 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1948 /* bad signature */
1949 al = SSL_AD_DECRYPT_ERROR;
1950 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1951 goto f_err;
1952 }
1953 }
1954 } else {
7689082b
DSH		 1955 /* aNULL, aSRP or PSK do not need public keys */
1956 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_PSK)) {
0f113f3e
MC		 1957 /* Might be wrong key type, check it */
1958 if (ssl3_check_cert_and_algorithm(s))
1959 /* Otherwise this shouldn't happen */
1960 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1961 goto err;
1962 }
1963 /* still data left over */
1964 if (n != 0) {
1965 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
1966 goto f_err;
1967 }
1968 }
1969 EVP_PKEY_free(pkey);
1970 EVP_MD_CTX_cleanup(&md_ctx);
1971 return (1);
1972 f_err:
1973 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1974 err:
1975 EVP_PKEY_free(pkey);
bc36ee62 1976#ifndef OPENSSL_NO_RSA
d6407083 1977 RSA_free(rsa);
6b521df3 1978#endif
bc36ee62 1979#ifndef OPENSSL_NO_DH
d6407083 1980 DH_free(dh);
ea262260 1981#endif
10bf4fc2 1982#ifndef OPENSSL_NO_EC
0f113f3e
MC		 1983 BN_CTX_free(bn_ctx);
1984 EC_POINT_free(srvr_ecpoint);
8fdc3734 1985 EC_KEY_free(ecdh);
6b521df3 1986#endif
0f113f3e 1987 EVP_MD_CTX_cleanup(&md_ctx);
cc273a93 1988 s->state = SSL_ST_ERR;
0f113f3e
MC		 1989 return (-1);
1990}
d02b48c6 1991
36d16f8e 1992int ssl3_get_certificate_request(SSL *s)
0f113f3e
MC		 1993{
1994 int ok, ret = 0;
1995 unsigned long n, nc, l;
1996 unsigned int llen, ctype_num, i;
1997 X509_NAME *xn = NULL;
1998 const unsigned char *p, *q;
1999 unsigned char *d;
2000 STACK_OF(X509_NAME) *ca_sk = NULL;
2001
2002 n = s->method->ssl_get_message(s,
2003 SSL3_ST_CR_CERT_REQ_A,
2004 SSL3_ST_CR_CERT_REQ_B,
2005 -1, s->max_cert_list, &ok);
2006
2007 if (!ok)
2008 return ((int)n);
2009
2010 s->s3->tmp.cert_req = 0;
2011
2012 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
2013 s->s3->tmp.reuse_message = 1;
2014 /*
2015 * If we get here we don't need any cached handshake records as we
2016 * wont be doing client auth.
2017 */
124037fd
DSH		 2018 if (!ssl3_digest_cached_records(s, 0))
2019 goto err;
0f113f3e
MC		 2020 return (1);
2021 }
2022
2023 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
2024 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2025 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
2026 goto err;
2027 }
2028
2029 /* TLS does not like anon-DH with client cert */
2030 if (s->version > SSL3_VERSION) {
2031 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
2032 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2033 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2034 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2035 goto err;
2036 }
2037 }
2038
2039 p = d = (unsigned char *)s->init_msg;
2040
2041 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
2042 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2043 goto err;
2044 }
2045
2046 /* get the certificate types */
2047 ctype_num = *(p++);
b548a1f1
RS		 2048 OPENSSL_free(s->cert->ctypes);
2049 s->cert->ctypes = NULL;
0f113f3e
MC		 2050 if (ctype_num > SSL3_CT_NUMBER) {
2051 /* If we exceed static buffer copy all to cert structure */
2052 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2053 if (s->cert->ctypes == NULL) {
2054 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2055 goto err;
2056 }
2057 memcpy(s->cert->ctypes, p, ctype_num);
2058 s->cert->ctype_num = (size_t)ctype_num;
2059 ctype_num = SSL3_CT_NUMBER;
2060 }
2061 for (i = 0; i < ctype_num; i++)
2062 s->s3->tmp.ctype[i] = p[i];
2063 p += p[-1];
2064 if (SSL_USE_SIGALGS(s)) {
2065 n2s(p, llen);
2066 /*
2067 * Check we have enough room for signature algorithms and following
2068 * length value.
2069 */
2070 if ((unsigned long)(p - d + llen + 2) > n) {
2071 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2072 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2073 SSL_R_DATA_LENGTH_TOO_LONG);
2074 goto err;
2075 }
2076 /* Clear certificate digests and validity flags */
2077 for (i = 0; i < SSL_PKEY_NUM; i++) {
d376e57d 2078 s->s3->tmp.md[i] = NULL;
6383d316 2079 s->s3->tmp.valid_flags[i] = 0;
0f113f3e
MC		 2080 }
2081 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) {
2082 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2083 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2084 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2085 goto err;
2086 }
2087 if (!tls1_process_sigalgs(s)) {
2088 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2089 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2090 goto err;
2091 }
2092 p += llen;
2093 }
2094
2095 /* get the CA RDNs */
2096 n2s(p, llen);
0f113f3e
MC		 2097
2098 if ((unsigned long)(p - d + llen) != n) {
2099 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2100 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
2101 goto err;
2102 }
2103
2104 for (nc = 0; nc < llen;) {
2105 n2s(p, l);
2106 if ((l + nc + 2) > llen) {
0f113f3e
MC		 2107 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2108 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
2109 goto err;
2110 }
2111
2112 q = p;
2113
2114 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
3c33c6f6
MC		 2115 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2116 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
2117 goto err;
0f113f3e
MC		 2118 }
2119
2120 if (q != (p + l)) {
2121 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2122 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2123 SSL_R_CA_DN_LENGTH_MISMATCH);
2124 goto err;
2125 }
2126 if (!sk_X509_NAME_push(ca_sk, xn)) {
2127 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2128 goto err;
2129 }
2130
2131 p += l;
2132 nc += l + 2;
2133 }
2134
0f113f3e
MC		 2135 /* we should setup a certificate to return.... */
2136 s->s3->tmp.cert_req = 1;
2137 s->s3->tmp.ctype_num = ctype_num;
222561fe 2138 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
0f113f3e
MC		 2139 s->s3->tmp.ca_names = ca_sk;
2140 ca_sk = NULL;
2141
2142 ret = 1;
cc273a93 2143 goto done;
0f113f3e 2144 err:
cc273a93
MC		 2145 s->state = SSL_ST_ERR;
2146 done:
222561fe 2147 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
0f113f3e
MC		 2148 return (ret);
2149}
2150
2151static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
dfeab068 2152{
0f113f3e 2153 return (X509_NAME_cmp(*a, *b));
dfeab068 2154}
dfeab068 2155
6434abbf 2156int ssl3_get_new_session_ticket(SSL *s)
0f113f3e
MC		 2157{
2158 int ok, al, ret = 0, ticklen;
2159 long n;
2160 const unsigned char *p;
2161 unsigned char *d;
2162
2163 n = s->method->ssl_get_message(s,
2164 SSL3_ST_CR_SESSION_TICKET_A,
2165 SSL3_ST_CR_SESSION_TICKET_B,
2166 SSL3_MT_NEWSESSION_TICKET, 16384, &ok);
2167
2168 if (!ok)
2169 return ((int)n);
2170
2171 if (n < 6) {
2172 /* need at least ticket_lifetime_hint + ticket length */
2173 al = SSL_AD_DECODE_ERROR;
2174 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2175 goto f_err;
2176 }
2177
2178 p = d = (unsigned char *)s->init_msg;
98ece4ee
MC		 2179
2180 if (s->session->session_id_length > 0) {
2181 int i = s->session_ctx->session_cache_mode;
2182 SSL_SESSION *new_sess;
2183 /*
2184 * We reused an existing session, so we need to replace it with a new
2185 * one
2186 */
2187 if (i & SSL_SESS_CACHE_CLIENT) {
2188 /*
2189 * Remove the old session from the cache
2190 */
2191 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) {
2192 if (s->session_ctx->remove_session_cb != NULL)
2193 s->session_ctx->remove_session_cb(s->session_ctx,
2194 s->session);
2195 } else {
2196 /* We carry on if this fails */
2197 SSL_CTX_remove_session(s->session_ctx, s->session);
2198 }
2199 }
2200
2201 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
2202 al = SSL_AD_INTERNAL_ERROR;
2203 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2204 goto f_err;
2205 }
2206
2207 SSL_SESSION_free(s->session);
2208 s->session = new_sess;
2209 }
2210
0f113f3e
MC		 2211 n2l(p, s->session->tlsext_tick_lifetime_hint);
2212 n2s(p, ticklen);
2213 /* ticket_lifetime_hint + ticket_length + ticket */
2214 if (ticklen + 6 != n) {
2215 al = SSL_AD_DECODE_ERROR;
2216 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2217 goto f_err;
2218 }
b548a1f1
RS		 2219 OPENSSL_free(s->session->tlsext_tick);
2220 s->session->tlsext_ticklen = 0;
0f113f3e
MC		 2221 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2222 if (!s->session->tlsext_tick) {
2223 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2224 goto err;
2225 }
2226 memcpy(s->session->tlsext_tick, p, ticklen);
2227 s->session->tlsext_ticklen = ticklen;
2228 /*
2229 * There are two ways to detect a resumed ticket session. One is to set
2230 * an appropriate session ID and then the server must return a match in
2231 * ServerHello. This allows the normal client session ID matching to work
2232 * and we know much earlier that the ticket has been accepted. The
2233 * other way is to set zero length session ID when the ticket is
2234 * presented and rely on the handshake to determine session resumption.
2235 * We choose the former approach because this fits in with assumptions
2236 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
2237 * SHA256 is disabled) hash of the ticket.
2238 */
2239 EVP_Digest(p, ticklen,
2240 s->session->session_id, &s->session->session_id_length,
0f113f3e 2241 EVP_sha256(), NULL);
0f113f3e
MC		 2242 ret = 1;
2243 return (ret);
2244 f_err:
2245 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2246 err:
cc273a93 2247 s->state = SSL_ST_ERR;
0f113f3e
MC		 2248 return (-1);
2249}
67c8e7f4
DSH		 2250
2251int ssl3_get_cert_status(SSL *s)
0f113f3e
MC		 2252{
2253 int ok, al;
2254 unsigned long resplen, n;
2255 const unsigned char *p;
2256
2257 n = s->method->ssl_get_message(s,
2258 SSL3_ST_CR_CERT_STATUS_A,
2259 SSL3_ST_CR_CERT_STATUS_B,
2260 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
2261
2262 if (!ok)
2263 return ((int)n);
2264 if (n < 4) {
2265 /* need at least status type + length */
2266 al = SSL_AD_DECODE_ERROR;
2267 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2268 goto f_err;
2269 }
2270 p = (unsigned char *)s->init_msg;
2271 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
2272 al = SSL_AD_DECODE_ERROR;
2273 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
2274 goto f_err;
2275 }
2276 n2l3(p, resplen);
2277 if (resplen + 4 != n) {
2278 al = SSL_AD_DECODE_ERROR;
2279 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2280 goto f_err;
2281 }
b548a1f1 2282 OPENSSL_free(s->tlsext_ocsp_resp);
0f113f3e
MC		 2283 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2284 if (!s->tlsext_ocsp_resp) {
2285 al = SSL_AD_INTERNAL_ERROR;
2286 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2287 goto f_err;
2288 }
2289 s->tlsext_ocsp_resplen = resplen;
2290 if (s->ctx->tlsext_status_cb) {
2291 int ret;
2292 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2293 if (ret == 0) {
2294 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2295 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
2296 goto f_err;
2297 }
2298 if (ret < 0) {
2299 al = SSL_AD_INTERNAL_ERROR;
2300 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2301 goto f_err;
2302 }
2303 }
2304 return 1;
2305 f_err:
2306 ssl3_send_alert(s, SSL3_AL_FATAL, al);
cc273a93 2307 s->state = SSL_ST_ERR;
0f113f3e
MC		 2308 return (-1);
2309}
d02b48c6 2310
36d16f8e 2311int ssl3_get_server_done(SSL *s)
0f113f3e
MC		 2312{
2313 int ok, ret = 0;
2314 long n;
2315
2316 /* Second to last param should be very small, like 0 :-) */
2317 n = s->method->ssl_get_message(s,
2318 SSL3_ST_CR_SRVR_DONE_A,
2319 SSL3_ST_CR_SRVR_DONE_B,
2320 SSL3_MT_SERVER_DONE, 30, &ok);
2321
2322 if (!ok)
2323 return ((int)n);
2324 if (n > 0) {
2325 /* should contain no data */
2326 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2327 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
cc273a93 2328 s->state = SSL_ST_ERR;
0f113f3e
MC		 2329 return -1;
2330 }
2331 ret = 1;
2332 return (ret);
2333}
176f31dd 2334
36d16f8e 2335int ssl3_send_client_key_exchange(SSL *s)
0f113f3e
MC		 2336{
2337 unsigned char *p;
2338 int n;
7689082b
DSH		 2339#ifndef OPENSSL_NO_PSK
2340 size_t pskhdrlen = 0;
2341#endif
0f113f3e 2342 unsigned long alg_k;
bc36ee62 2343#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 2344 unsigned char *q;
2345 EVP_PKEY *pkey = NULL;
79df9d62 2346#endif
10bf4fc2 2347#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2348 EC_KEY *clnt_ecdh = NULL;
2349 const EC_POINT *srvr_ecpoint = NULL;
2350 EVP_PKEY *srvr_pub_pkey = NULL;
2351 unsigned char *encodedPoint = NULL;
2352 int encoded_pt_len = 0;
2353 BN_CTX *bn_ctx = NULL;
ea262260 2354#endif
c660ec63
DSH		 2355 unsigned char *pms = NULL;
2356 size_t pmslen = 0;
7689082b 2357 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
d02b48c6 2358
0f113f3e
MC		 2359 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
2360 p = ssl_handshake_start(s);
d02b48c6 2361
7689082b
DSH		 2362
2363#ifndef OPENSSL_NO_PSK
2364 if (alg_k & SSL_PSK) {
2365 int psk_err = 1;
2366 /*
2367 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
2368 * \0-terminated identity. The last byte is for us for simulating
2369 * strnlen.
2370 */
2371 char identity[PSK_MAX_IDENTITY_LEN + 1];
2372 size_t identitylen;
2373 unsigned char psk[PSK_MAX_PSK_LEN];
2374 size_t psklen;
2375
2376 if (s->psk_client_callback == NULL) {
2377 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2378 SSL_R_PSK_NO_CLIENT_CB);
2379 goto err;
2380 }
2381
2382 memset(identity, 0, sizeof(identity));
2383
2384 psklen = s->psk_client_callback(s, s->session->psk_identity_hint,
2385 identity, sizeof(identity) - 1,
2386 psk, sizeof(psk));
2387
2388 if (psklen > PSK_MAX_PSK_LEN) {
2389 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2390 ERR_R_INTERNAL_ERROR);
2391 goto psk_err;
2392 } else if (psklen == 0) {
2393 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2394 SSL_R_PSK_IDENTITY_NOT_FOUND);
2395 goto psk_err;
2396 }
2397
2398 OPENSSL_free(s->s3->tmp.psk);
2399 s->s3->tmp.psk = BUF_memdup(psk, psklen);
2400 OPENSSL_cleanse(psk, psklen);
2401
3df16cc2
DSH		 2402 if (s->s3->tmp.psk == NULL) {
2403 OPENSSL_cleanse(identity, sizeof(identity));
7689082b 2404 goto memerr;
3df16cc2 2405 }
7689082b
DSH		 2406
2407 s->s3->tmp.psklen = psklen;
2408
2409 identitylen = strlen(identity);
2410 if (identitylen > PSK_MAX_IDENTITY_LEN) {
2411 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2412 ERR_R_INTERNAL_ERROR);
2413 goto psk_err;
2414 }
2415 OPENSSL_free(s->session->psk_identity);
2416 s->session->psk_identity = BUF_strdup(identity);
3df16cc2
DSH		 2417 if (s->session->psk_identity == NULL) {
2418 OPENSSL_cleanse(identity, sizeof(identity));
7689082b 2419 goto memerr;
3df16cc2 2420 }
7689082b
DSH		 2421
2422 s2n(identitylen, p);
2423 memcpy(p, identity, identitylen);
2424 pskhdrlen = 2 + identitylen;
2425 p += identitylen;
2426 psk_err = 0;
2427 psk_err:
2428 OPENSSL_cleanse(identity, sizeof(identity));
2429 if (psk_err != 0) {
2430 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2431 goto err;
2432 }
2433 }
2434 if (alg_k & SSL_kPSK) {
2435 n = 0;
2436 } else
2437#endif
d02b48c6 2438
0f113f3e
MC		 2439 /* Fool emacs indentation */
2440 if (0) {
2441 }
bc36ee62 2442#ifndef OPENSSL_NO_RSA
7689082b 2443 else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
0f113f3e 2444 RSA *rsa;
c660ec63
DSH		 2445 pmslen = SSL_MAX_MASTER_KEY_LENGTH;
2446 pms = OPENSSL_malloc(pmslen);
2447 if (!pms)
2448 goto memerr;
0f113f3e 2449
389ebcec 2450 if (s->session->peer == NULL) {
0f113f3e
MC		 2451 /*
2452 * We should always have a server certificate with SSL_kRSA.
2453 */
2454 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2455 ERR_R_INTERNAL_ERROR);
2456 goto err;
2457 }
2458
8d92c1f8
DSH		 2459 if (s->s3->peer_rsa_tmp != NULL)
2460 rsa = s->s3->peer_rsa_tmp;
0f113f3e 2461 else {
a273c6ee 2462 pkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 2463 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
2464 || (pkey->pkey.rsa == NULL)) {
2465 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2466 ERR_R_INTERNAL_ERROR);
2467 goto err;
2468 }
2469 rsa = pkey->pkey.rsa;
2470 EVP_PKEY_free(pkey);
2471 }
2472
c660ec63
DSH		 2473 pms[0] = s->client_version >> 8;
2474 pms[1] = s->client_version & 0xff;
2475 if (RAND_bytes(pms + 2, pmslen - 2) <= 0)
0f113f3e
MC		 2476 goto err;
2477
0f113f3e
MC		 2478 q = p;
2479 /* Fix buf for TLS and beyond */
2480 if (s->version > SSL3_VERSION)
2481 p += 2;
c660ec63 2482 n = RSA_public_encrypt(pmslen, pms, p, rsa, RSA_PKCS1_PADDING);
0f113f3e
MC		 2483# ifdef PKCS1_CHECK
2484 if (s->options & SSL_OP_PKCS1_CHECK_1)
2485 p[1]++;
2486 if (s->options & SSL_OP_PKCS1_CHECK_2)
2487 tmp_buf[0] = 0x70;
2488# endif
2489 if (n <= 0) {
2490 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2491 SSL_R_BAD_RSA_ENCRYPT);
2492 goto err;
2493 }
2494
2495 /* Fix buf for TLS and beyond */
2496 if (s->version > SSL3_VERSION) {
2497 s2n(n, q);
2498 n += 2;
2499 }
0f113f3e 2500 }
f9b3bff6 2501#endif
bc36ee62 2502#ifndef OPENSSL_NO_DH
7689082b 2503 else if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd | SSL_kDHEPSK)) {
0f113f3e 2504 DH *dh_srvr, *dh_clnt;
8d92c1f8
DSH		 2505 if (s->s3->peer_dh_tmp != NULL)
2506 dh_srvr = s->s3->peer_dh_tmp;
0f113f3e
MC		 2507 else {
2508 /* we get them from the cert */
0f113f3e
MC		 2509 EVP_PKEY *spkey = NULL;
2510 dh_srvr = NULL;
a273c6ee 2511 spkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 2512 if (spkey) {
2513 dh_srvr = EVP_PKEY_get1_DH(spkey);
2514 EVP_PKEY_free(spkey);
2515 }
2516 if (dh_srvr == NULL) {
2517 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2518 ERR_R_INTERNAL_ERROR);
2519 goto err;
2520 }
2521 }
2522 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
2523 /* Use client certificate key */
2524 EVP_PKEY *clkey = s->cert->key->privatekey;
2525 dh_clnt = NULL;
2526 if (clkey)
2527 dh_clnt = EVP_PKEY_get1_DH(clkey);
2528 if (dh_clnt == NULL) {
2529 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2530 ERR_R_INTERNAL_ERROR);
2531 goto err;
2532 }
2533 } else {
2534 /* generate a new random key */
2535 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2536 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2537 goto err;
2538 }
2539 if (!DH_generate_key(dh_clnt)) {
2540 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2541 DH_free(dh_clnt);
2542 goto err;
2543 }
2544 }
2545
c660ec63
DSH		 2546 pmslen = DH_size(dh_clnt);
2547 pms = OPENSSL_malloc(pmslen);
2548 if (!pms)
2549 goto memerr;
2550
0f113f3e
MC		 2551 /*
2552 * use the 'p' output buffer for the DH key, but make sure to
2553 * clear it out afterwards
2554 */
2555
c660ec63 2556 n = DH_compute_key(pms, dh_srvr->pub_key, dh_clnt);
8d92c1f8 2557 if (s->s3->peer_dh_tmp == NULL)
0f113f3e
MC		 2558 DH_free(dh_srvr);
2559
2560 if (n <= 0) {
2561 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2562 DH_free(dh_clnt);
2563 goto err;
2564 }
6b937f8b 2565 pmslen = n;
0f113f3e 2566
0f113f3e
MC		 2567 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2568 n = 0;
2569 else {
2570 /* send off the data */
2571 n = BN_num_bytes(dh_clnt->pub_key);
2572 s2n(n, p);
2573 BN_bn2bin(dh_clnt->pub_key, p);
2574 n += 2;
2575 }
2576
2577 DH_free(dh_clnt);
0f113f3e 2578 }
d02b48c6 2579#endif
ea262260 2580
10bf4fc2 2581#ifndef OPENSSL_NO_EC
7689082b 2582 else if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) {
0f113f3e
MC		 2583 const EC_GROUP *srvr_group = NULL;
2584 EC_KEY *tkey;
2585 int ecdh_clnt_cert = 0;
2586 int field_size = 0;
0f113f3e
MC		 2587 /*
2588 * Did we send out the client's ECDH share for use in premaster
2589 * computation as part of client certificate? If so, set
2590 * ecdh_clnt_cert to 1.
2591 */
2592 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
50e735f9
MC		 2593 /*-
2594 * XXX: For now, we do not support client
2595 * authentication using ECDH certificates.
2596 * To add such support, one needs to add
2597 * code that checks for appropriate
2598 * conditions and sets ecdh_clnt_cert to 1.
2599 * For example, the cert have an ECC
2600 * key on the same curve as the server's
2601 * and the key should be authorized for
2602 * key agreement.
2603 *
2604 * One also needs to add code in ssl3_connect
2605 * to skip sending the certificate verify
2606 * message.
2607 *
2608 * if ((s->cert->key->privatekey != NULL) &&
2609 * (s->cert->key->privatekey->type ==
2610 * EVP_PKEY_EC) && ...)
2611 * ecdh_clnt_cert = 1;
2612 */
0f113f3e
MC		 2613 }
2614
8d92c1f8
DSH		 2615 if (s->s3->peer_ecdh_tmp != NULL) {
2616 tkey = s->s3->peer_ecdh_tmp;
0f113f3e
MC		 2617 } else {
2618 /* Get the Server Public Key from Cert */
a273c6ee 2619 srvr_pub_pkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 2620 if ((srvr_pub_pkey == NULL)
2621 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2622 || (srvr_pub_pkey->pkey.ec == NULL)) {
2623 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2624 ERR_R_INTERNAL_ERROR);
2625 goto err;
2626 }
2627
2628 tkey = srvr_pub_pkey->pkey.ec;
2629 }
2630
2631 srvr_group = EC_KEY_get0_group(tkey);
2632 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2633
2634 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2635 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2636 ERR_R_INTERNAL_ERROR);
2637 goto err;
2638 }
2639
2640 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2641 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2642 ERR_R_MALLOC_FAILURE);
2643 goto err;
2644 }
2645
2646 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2647 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2648 goto err;
2649 }
2650 if (ecdh_clnt_cert) {
2651 /*
2652 * Reuse key info from our certificate We only need our
2653 * private key to perform the ECDH computation.
2654 */
2655 const BIGNUM *priv_key;
2656 tkey = s->cert->key->privatekey->pkey.ec;
2657 priv_key = EC_KEY_get0_private_key(tkey);
2658 if (priv_key == NULL) {
2659 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2660 ERR_R_MALLOC_FAILURE);
2661 goto err;
2662 }
2663 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2664 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2665 goto err;
2666 }
2667 } else {
2668 /* Generate a new ECDH key pair */
2669 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2670 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2671 ERR_R_ECDH_LIB);
2672 goto err;
2673 }
2674 }
2675
2676 /*
2677 * use the 'p' output buffer for the ECDH key, but make sure to
2678 * clear it out afterwards
2679 */
2680
2681 field_size = EC_GROUP_get_degree(srvr_group);
2682 if (field_size <= 0) {
2683 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2684 goto err;
2685 }
c660ec63
DSH		 2686 pmslen = (field_size + 7) / 8;
2687 pms = OPENSSL_malloc(pmslen);
2688 if (!pms)
2689 goto memerr;
2690 n = ECDH_compute_key(pms, pmslen, srvr_ecpoint, clnt_ecdh, NULL);
2691 if (n <= 0 || pmslen != (size_t)n) {
0f113f3e
MC		 2692 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2693 goto err;
2694 }
2695
0f113f3e
MC		 2696 if (ecdh_clnt_cert) {
2697 /* Send empty client key exch message */
2698 n = 0;
2699 } else {
2700 /*
2701 * First check the size of encoding and allocate memory
2702 * accordingly.
2703 */
2704 encoded_pt_len =
2705 EC_POINT_point2oct(srvr_group,
2706 EC_KEY_get0_public_key(clnt_ecdh),
2707 POINT_CONVERSION_UNCOMPRESSED,
2708 NULL, 0, NULL);
2709
2710 encodedPoint = (unsigned char *)
2711 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2712 bn_ctx = BN_CTX_new();
2713 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2714 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2715 ERR_R_MALLOC_FAILURE);
2716 goto err;
2717 }
2718
2719 /* Encode the public key */
2720 n = EC_POINT_point2oct(srvr_group,
2721 EC_KEY_get0_public_key(clnt_ecdh),
2722 POINT_CONVERSION_UNCOMPRESSED,
2723 encodedPoint, encoded_pt_len, bn_ctx);
2724
2725 *p = n; /* length of encoded point */
2726 /* Encoded point will be copied here */
2727 p += 1;
2728 /* copy the point */
16f8d4eb 2729 memcpy(p, encodedPoint, n);
0f113f3e
MC		 2730 /* increment n to account for length field */
2731 n += 1;
2732 }
2733
2734 /* Free allocated memory */
2735 BN_CTX_free(bn_ctx);
b548a1f1 2736 OPENSSL_free(encodedPoint);
8fdc3734 2737 EC_KEY_free(clnt_ecdh);
0f113f3e
MC		 2738 EVP_PKEY_free(srvr_pub_pkey);
2739 }
10bf4fc2 2740#endif /* !OPENSSL_NO_EC */
0f113f3e
MC		 2741 else if (alg_k & SSL_kGOST) {
2742 /* GOST key exchange message creation */
2743 EVP_PKEY_CTX *pkey_ctx;
2744 X509 *peer_cert;
2745 size_t msglen;
2746 unsigned int md_len;
c660ec63 2747 unsigned char shared_ukm[32], tmp[256];
0f113f3e
MC		 2748 EVP_MD_CTX *ukm_hash;
2749 EVP_PKEY *pub_key;
2750
c660ec63
DSH		 2751 pmslen = 32;
2752 pms = OPENSSL_malloc(pmslen);
2753 if (!pms)
2754 goto memerr;
2755
0f113f3e
MC		 2756 /*
2757 * Get server sertificate PKEY and create ctx from it
2758 */
a273c6ee 2759 peer_cert = s->session->peer;
0f113f3e
MC		 2760 if (!peer_cert) {
2761 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2762 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2763 goto err;
2764 }
2765
2766 pkey_ctx = EVP_PKEY_CTX_new(pub_key =
2767 X509_get_pubkey(peer_cert), NULL);
2768 /*
2769 * If we have send a certificate, and certificate key
2770 *
2771 * * parameters match those of server certificate, use
2772 * certificate key for key exchange
2773 */
2774
2775 /* Otherwise, generate ephemeral key pair */
2776
2777 EVP_PKEY_encrypt_init(pkey_ctx);
2778 /* Generate session key */
266483d2
MC		 2779 if (RAND_bytes(pms, pmslen) <= 0) {
2780 EVP_PKEY_CTX_free(pkey_ctx);
2781 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2782 ERR_R_INTERNAL_ERROR);
2783 goto err;
2784 };
0f113f3e
MC		 2785 /*
2786 * If we have client certificate, use its secret as peer key
2787 */
2788 if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2789 if (EVP_PKEY_derive_set_peer
2790 (pkey_ctx, s->cert->key->privatekey) <= 0) {
2791 /*
2792 * If there was an error - just ignore it. Ephemeral key
2793 * * would be used
2794 */
2795 ERR_clear_error();
2796 }
2797 }
2798 /*
2799 * Compute shared IV and store it in algorithm-specific context
2800 * data
2801 */
2802 ukm_hash = EVP_MD_CTX_create();
2803 EVP_DigestInit(ukm_hash,
2804 EVP_get_digestbynid(NID_id_GostR3411_94));
2805 EVP_DigestUpdate(ukm_hash, s->s3->client_random,
2806 SSL3_RANDOM_SIZE);
2807 EVP_DigestUpdate(ukm_hash, s->s3->server_random,
2808 SSL3_RANDOM_SIZE);
2809 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2810 EVP_MD_CTX_destroy(ukm_hash);
2811 if (EVP_PKEY_CTX_ctrl
2812 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8,
2813 shared_ukm) < 0) {
2814 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2815 SSL_R_LIBRARY_BUG);
2816 goto err;
2817 }
2818 /* Make GOST keytransport blob message */
2819 /*
2820 * Encapsulate it into sequence
2821 */
2822 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2823 msglen = 255;
c660ec63 2824 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) < 0) {
0f113f3e
MC		 2825 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2826 SSL_R_LIBRARY_BUG);
2827 goto err;
2828 }
2829 if (msglen >= 0x80) {
2830 *(p++) = 0x81;
2831 *(p++) = msglen & 0xff;
2832 n = msglen + 3;
2833 } else {
2834 *(p++) = msglen & 0xff;
2835 n = msglen + 2;
2836 }
2837 memcpy(p, tmp, msglen);
2838 /* Check if pubkey from client certificate was used */
2839 if (EVP_PKEY_CTX_ctrl
2840 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) {
2841 /* Set flag "skip certificate verify" */
2842 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2843 }
2844 EVP_PKEY_CTX_free(pkey_ctx);
0f113f3e
MC		 2845 EVP_PKEY_free(pub_key);
2846
2847 }
edc032b5 2848#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 2849 else if (alg_k & SSL_kSRP) {
2850 if (s->srp_ctx.A != NULL) {
2851 /* send off the data */
2852 n = BN_num_bytes(s->srp_ctx.A);
2853 s2n(n, p);
2854 BN_bn2bin(s->srp_ctx.A, p);
2855 n += 2;
2856 } else {
2857 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2858 ERR_R_INTERNAL_ERROR);
2859 goto err;
2860 }
b548a1f1 2861 OPENSSL_free(s->session->srp_username);
0f113f3e
MC		 2862 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2863 if (s->session->srp_username == NULL) {
2864 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2865 ERR_R_MALLOC_FAILURE);
2866 goto err;
2867 }
0f113f3e 2868 }
0f113f3e
MC		 2869#endif
2870 else {
2871 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2872 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2873 goto err;
2874 }
2875
7689082b
DSH		 2876#ifndef OPENSSL_NO_PSK
2877 n += pskhdrlen;
2878#endif
2879
61986d32 2880 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n)) {
77d514c5
MC		 2881 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2882 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2883 goto err;
2884 }
2885
0f113f3e
MC		 2886 s->state = SSL3_ST_CW_KEY_EXCH_B;
2887 }
2888
2889 /* SSL3_ST_CW_KEY_EXCH_B */
c660ec63
DSH		 2890 n = ssl_do_write(s);
2891#ifndef OPENSSL_NO_SRP
2892 /* Check for SRP */
7689082b 2893 if (alg_k & SSL_kSRP) {
c660ec63
DSH		 2894 /*
2895 * If everything written generate master key: no need to save PMS as
57b272b0 2896 * srp_generate_client_master_secret generates it internally.
c660ec63
DSH		 2897 */
2898 if (n > 0) {
57b272b0 2899 if (!srp_generate_client_master_secret(s)) {
c660ec63
DSH		 2900 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2901 ERR_R_INTERNAL_ERROR);
2902 goto err;
2903 }
2904 }
2905 } else
2906#endif
2907 /* If we haven't written everything save PMS */
2908 if (n <= 0) {
76106e60
DSH		 2909 s->s3->tmp.pms = pms;
2910 s->s3->tmp.pmslen = pmslen;
c660ec63
DSH		 2911 } else {
2912 /* If we don't have a PMS restore */
2913 if (pms == NULL) {
76106e60
DSH		 2914 pms = s->s3->tmp.pms;
2915 pmslen = s->s3->tmp.pmslen;
c660ec63 2916 }
7689082b 2917 if (pms == NULL && !(alg_k & SSL_kPSK)) {
c660ec63
DSH		 2918 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2919 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
2920 goto err;
2921 }
57b272b0 2922 if (!ssl_generate_master_secret(s, pms, pmslen, 1)) {
69f68237
MC		 2923 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2924 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2925 goto err;
2926 }
c660ec63
DSH		 2927 }
2928 return n;
2929 memerr:
2930 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2931 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
0f113f3e 2932 err:
4b45c6e5 2933 OPENSSL_clear_free(pms, pmslen);
76106e60 2934 s->s3->tmp.pms = NULL;
10bf4fc2 2935#ifndef OPENSSL_NO_EC
0f113f3e 2936 BN_CTX_free(bn_ctx);
b548a1f1 2937 OPENSSL_free(encodedPoint);
8fdc3734 2938 EC_KEY_free(clnt_ecdh);
0f113f3e 2939 EVP_PKEY_free(srvr_pub_pkey);
7689082b
DSH		 2940#endif
2941#ifndef OPENSSL_NO_PSK
2942 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
2943 s->s3->tmp.psk = NULL;
0f113f3e 2944#endif
cc273a93 2945 s->state = SSL_ST_ERR;
0f113f3e
MC		 2946 return (-1);
2947}
d02b48c6 2948
36d16f8e 2949int ssl3_send_client_verify(SSL *s)
0f113f3e
MC		 2950{
2951 unsigned char *p;
2952 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
2953 EVP_PKEY *pkey;
2954 EVP_PKEY_CTX *pctx = NULL;
2955 EVP_MD_CTX mctx;
2956 unsigned u = 0;
2957 unsigned long n;
2958 int j;
2959
2960 EVP_MD_CTX_init(&mctx);
2961
2962 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
2963 p = ssl_handshake_start(s);
2964 pkey = s->cert->key->privatekey;
0e1dba93 2965/* Create context from key and test if sha1 is allowed as digest */
0f113f3e
MC		 2966 pctx = EVP_PKEY_CTX_new(pkey, NULL);
2967 EVP_PKEY_sign_init(pctx);
2968 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
2969 if (!SSL_USE_SIGALGS(s))
2970 s->method->ssl3_enc->cert_verify_mac(s,
2971 NID_sha1,
2972 &(data
2973 [MD5_DIGEST_LENGTH]));
2974 } else {
2975 ERR_clear_error();
2976 }
2977 /*
2978 * For TLS v1.2 send signature algorithm and signature using agreed
2979 * digest and cached handshake records.
2980 */
2981 if (SSL_USE_SIGALGS(s)) {
2982 long hdatalen = 0;
2983 void *hdata;
d376e57d 2984 const EVP_MD *md = s->s3->tmp.md[s->cert->key - s->cert->pkeys];
0f113f3e
MC		 2985 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
2986 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) {
2987 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
2988 goto err;
2989 }
2990 p += 2;
855a54a9 2991#ifdef SSL_DEBUG
0f113f3e
MC		 2992 fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2993 EVP_MD_name(md));
2994#endif
2995 if (!EVP_SignInit_ex(&mctx, md, NULL)
2996 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2997 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
2998 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB);
2999 goto err;
3000 }
3001 s2n(u, p);
3002 n = u + 4;
124037fd
DSH		 3003 /* Digest cached records and discard handshake buffer */
3004 if (!ssl3_digest_cached_records(s, 0))
0f113f3e
MC		 3005 goto err;
3006 } else
bc36ee62 3007#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 3008 if (pkey->type == EVP_PKEY_RSA) {
3009 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
3010 if (RSA_sign(NID_md5_sha1, data,
3011 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
3012 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
3013 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
3014 goto err;
3015 }
3016 s2n(u, p);
3017 n = u + 2;
3018 } else
d02b48c6 3019#endif
bc36ee62 3020#ifndef OPENSSL_NO_DSA
0f113f3e
MC		 3021 if (pkey->type == EVP_PKEY_DSA) {
3022 if (!DSA_sign(pkey->save_type,
3023 &(data[MD5_DIGEST_LENGTH]),
3024 SHA_DIGEST_LENGTH, &(p[2]),
3025 (unsigned int *)&j, pkey->pkey.dsa)) {
3026 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
3027 goto err;
3028 }
3029 s2n(j, p);
3030 n = j + 2;
3031 } else
ea262260 3032#endif
10bf4fc2 3033#ifndef OPENSSL_NO_EC
0f113f3e
MC		 3034 if (pkey->type == EVP_PKEY_EC) {
3035 if (!ECDSA_sign(pkey->save_type,
3036 &(data[MD5_DIGEST_LENGTH]),
3037 SHA_DIGEST_LENGTH, &(p[2]),
3038 (unsigned int *)&j, pkey->pkey.ec)) {
3039 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
3040 goto err;
3041 }
3042 s2n(j, p);
3043 n = j + 2;
3044 } else
3045#endif
3046 if (pkey->type == NID_id_GostR3410_94
3047 || pkey->type == NID_id_GostR3410_2001) {
3048 unsigned char signbuf[64];
3049 int i;
3050 size_t sigsize = 64;
3051 s->method->ssl3_enc->cert_verify_mac(s,
3052 NID_id_GostR3411_94, data);
3053 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3054 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3055 goto err;
3056 }
3057 for (i = 63, j = 0; i >= 0; j++, i--) {
3058 p[2 + j] = signbuf[i];
3059 }
3060 s2n(j, p);
3061 n = j + 2;
3062 } else {
3063 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3064 goto err;
3065 }
61986d32 3066 if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n)) {
77d514c5
MC		 3067 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3068 goto err;
3069 }
0f113f3e
MC		 3070 s->state = SSL3_ST_CW_CERT_VRFY_B;
3071 }
3072 EVP_MD_CTX_cleanup(&mctx);
3073 EVP_PKEY_CTX_free(pctx);
3074 return ssl_do_write(s);
3075 err:
3076 EVP_MD_CTX_cleanup(&mctx);
3077 EVP_PKEY_CTX_free(pctx);
cc273a93 3078 s->state = SSL_ST_ERR;
0f113f3e
MC		 3079 return (-1);
3080}
3081
3082/*
3083 * Check a certificate can be used for client authentication. Currently check
3084 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
3085 * certificates can be used and optionally checks suitability for Suite B.
0d609395
DSH		 3086 */
3087static int ssl3_check_client_certificate(SSL *s)
0f113f3e
MC		 3088{
3089 unsigned long alg_k;
3090 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3091 return 0;
3092 /* If no suitable signature algorithm can't use certificate */
d376e57d 3093 if (SSL_USE_SIGALGS(s) && !s->s3->tmp.md[s->cert->key - s->cert->pkeys])
0f113f3e
MC		 3094 return 0;
3095 /*
3096 * If strict mode check suitability of chain before using it. This also
3097 * adjusts suite B digest if necessary.
3098 */
3099 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3100 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3101 return 0;
3102 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3103 /* See if we can use client certificate for fixed DH */
3104 if (alg_k & (SSL_kDHr | SSL_kDHd)) {
a273c6ee 3105 int i = s->session->peer_type;
0f113f3e
MC		 3106 EVP_PKEY *clkey = NULL, *spkey = NULL;
3107 clkey = s->cert->key->privatekey;
3108 /* If client key not DH assume it can be used */
3109 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3110 return 1;
3111 if (i >= 0)
a273c6ee 3112 spkey = X509_get_pubkey(s->session->peer);
0f113f3e
MC		 3113 if (spkey) {
3114 /* Compare server and client parameters */
3115 i = EVP_PKEY_cmp_parameters(clkey, spkey);
3116 EVP_PKEY_free(spkey);
3117 if (i != 1)
3118 return 0;
3119 }
3120 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3121 }
3122 return 1;
3123}
0d609395 3124
36d16f8e 3125int ssl3_send_client_certificate(SSL *s)
0f113f3e
MC		 3126{
3127 X509 *x509 = NULL;
3128 EVP_PKEY *pkey = NULL;
3129 int i;
3130
3131 if (s->state == SSL3_ST_CW_CERT_A) {
3132 /* Let cert callback update client certificates if required */
3133 if (s->cert->cert_cb) {
3134 i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3135 if (i < 0) {
3136 s->rwstate = SSL_X509_LOOKUP;
3137 return -1;
3138 }
3139 if (i == 0) {
3140 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
cc273a93 3141 s->state = SSL_ST_ERR;
0f113f3e
MC		 3142 return 0;
3143 }
3144 s->rwstate = SSL_NOTHING;
3145 }
3146 if (ssl3_check_client_certificate(s))
3147 s->state = SSL3_ST_CW_CERT_C;
3148 else
3149 s->state = SSL3_ST_CW_CERT_B;
3150 }
3151
3152 /* We need to get a client cert */
3153 if (s->state == SSL3_ST_CW_CERT_B) {
3154 /*
3155 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3156 * return(-1); We then get retied later
3157 */
3158 i = 0;
3159 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3160 if (i < 0) {
3161 s->rwstate = SSL_X509_LOOKUP;
3162 return (-1);
3163 }
3164 s->rwstate = SSL_NOTHING;
3165 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3166 s->state = SSL3_ST_CW_CERT_B;
3167 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3168 i = 0;
3169 } else if (i == 1) {
3170 i = 0;
3171 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
3172 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3173 }
3174
222561fe 3175 X509_free(x509);
25aaa98a 3176 EVP_PKEY_free(pkey);
0f113f3e
MC		 3177 if (i && !ssl3_check_client_certificate(s))
3178 i = 0;
3179 if (i == 0) {
3180 if (s->version == SSL3_VERSION) {
3181 s->s3->tmp.cert_req = 0;
3182 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3183 return (1);
3184 } else {
3185 s->s3->tmp.cert_req = 2;
124037fd 3186 if (!ssl3_digest_cached_records(s, 0)) {
dab18ab5
DSH		 3187 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3188 s->state = SSL_ST_ERR;
3189 return 0;
3190 }
0f113f3e
MC		 3191 }
3192 }
3193
3194 /* Ok, we have a cert */
3195 s->state = SSL3_ST_CW_CERT_C;
3196 }
3197
3198 if (s->state == SSL3_ST_CW_CERT_C) {
3199 s->state = SSL3_ST_CW_CERT_D;
3200 if (!ssl3_output_cert_chain(s,
3201 (s->s3->tmp.cert_req ==
3202 2) ? NULL : s->cert->key)) {
3203 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3204 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
cc273a93 3205 s->state = SSL_ST_ERR;
0f113f3e
MC		 3206 return 0;
3207 }
3208 }
3209 /* SSL3_ST_CW_CERT_D */
3210 return ssl_do_write(s);
3211}
3212
3213#define has_bits(i,m) (((i)&(m)) == (m))
d02b48c6 3214
36d16f8e 3215int ssl3_check_cert_and_algorithm(SSL *s)
0f113f3e
MC		 3216{
3217 int i, idx;
3218 long alg_k, alg_a;
3219 EVP_PKEY *pkey = NULL;
ac38115c 3220 int pkey_bits;
bc36ee62 3221#ifndef OPENSSL_NO_RSA
0f113f3e 3222 RSA *rsa;
79df9d62 3223#endif
bc36ee62 3224#ifndef OPENSSL_NO_DH
0f113f3e 3225 DH *dh;
79df9d62 3226#endif
26c79d56 3227 int al = SSL_AD_HANDSHAKE_FAILURE;
d02b48c6 3228
0f113f3e
MC		 3229 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3230 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
d02b48c6 3231
0f113f3e 3232 /* we don't have a certificate */
55a9a16f 3233 if ((alg_a & SSL_aNULL) || (alg_k & SSL_kPSK))
0f113f3e 3234 return (1);
bc36ee62 3235#ifndef OPENSSL_NO_RSA
8d92c1f8 3236 rsa = s->s3->peer_rsa_tmp;
79df9d62 3237#endif
bc36ee62 3238#ifndef OPENSSL_NO_DH
8d92c1f8 3239 dh = s->s3->peer_dh_tmp;
79df9d62 3240#endif
d02b48c6 3241
0f113f3e 3242 /* This is the passed certificate */
d02b48c6 3243
a273c6ee 3244 idx = s->session->peer_type;
10bf4fc2 3245#ifndef OPENSSL_NO_EC
0f113f3e 3246 if (idx == SSL_PKEY_ECC) {
a273c6ee 3247 if (ssl_check_srvr_ecc_cert_and_alg(s->session->peer, s) == 0) {
0f113f3e
MC		 3248 /* check failed */
3249 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
3250 goto f_err;
3251 } else {
3252 return 1;
3253 }
3254 } else if (alg_a & SSL_aECDSA) {
3255 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3256 SSL_R_MISSING_ECDSA_SIGNING_CERT);
3257 goto f_err;
3258 } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
3259 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT);
3260 goto f_err;
3261 }
3262#endif
a273c6ee 3263 pkey = X509_get_pubkey(s->session->peer);
ac38115c 3264 pkey_bits = EVP_PKEY_bits(pkey);
a273c6ee 3265 i = X509_certificate_type(s->session->peer, pkey);
0f113f3e
MC		 3266 EVP_PKEY_free(pkey);
3267
3268 /* Check that we have a certificate if we require one */
3269 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
3270 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3271 SSL_R_MISSING_RSA_SIGNING_CERT);
3272 goto f_err;
3273 }
bc36ee62 3274#ifndef OPENSSL_NO_DSA
0f113f3e
MC		 3275 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
3276 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3277 SSL_R_MISSING_DSA_SIGNING_CERT);
3278 goto f_err;
3279 }
d02b48c6 3280#endif
bc36ee62 3281#ifndef OPENSSL_NO_RSA
7689082b 3282 if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
26c79d56
KR		 3283 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
3284 !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
3285 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3286 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3287 goto f_err;
3288 } else if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
3289 if (pkey_bits <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3290 if (!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
3291 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3292 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3293 goto f_err;
3294 }
3295 if (rsa != NULL) {
3296 /* server key exchange is not allowed. */
3297 al = SSL_AD_INTERNAL_ERROR;
3298 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3299 goto f_err;
3300 }
3301 }
3302 }
0f113f3e 3303 }
79df9d62 3304#endif
bc36ee62 3305#ifndef OPENSSL_NO_DH
26c79d56
KR		 3306 if ((alg_k & SSL_kDHE) && (dh == NULL)) {
3307 al = SSL_AD_INTERNAL_ERROR;
3308 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 3309 goto f_err;
3310 } else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3311 !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
3312 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3313 SSL_R_MISSING_DH_RSA_CERT);
3314 goto f_err;
3315 }
3316# ifndef OPENSSL_NO_DSA
3317 else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3318 !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
3319 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3320 SSL_R_MISSING_DH_DSA_CERT);
3321 goto f_err;
3322 }
3323# endif
d02b48c6
RE		 3324#endif
3325
ac38115c
KR		 3326 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
3327 pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
bc36ee62 3328#ifndef OPENSSL_NO_RSA
0f113f3e 3329 if (alg_k & SSL_kRSA) {
26c79d56
KR		 3330 if (rsa == NULL) {
3331 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3332 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3333 goto f_err;
3334 } else if (RSA_bits(rsa) >
0f113f3e 3335 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
26c79d56
KR		 3336 /* We have a temporary RSA key but it's too large. */
3337 al = SSL_AD_EXPORT_RESTRICTION;
0f113f3e
MC		 3338 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3339 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3340 goto f_err;
3341 }
3342 } else
d02b48c6 3343#endif
bc36ee62 3344#ifndef OPENSSL_NO_DH
26c79d56
KR		 3345 if (alg_k & SSL_kDHE) {
3346 if (DH_bits(dh) >
0f113f3e 3347 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
26c79d56
KR		 3348 /* We have a temporary DH key but it's too large. */
3349 al = SSL_AD_EXPORT_RESTRICTION;
0f113f3e
MC		 3350 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3351 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3352 goto f_err;
3353 }
26c79d56
KR		 3354 } else if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3355 /* The cert should have had an export DH key. */
3356 al = SSL_AD_EXPORT_RESTRICTION;
3357 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3358 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3359 goto f_err;
0f113f3e
MC		 3360 } else
3361#endif
3362 {
3363 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3364 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3365 goto f_err;
3366 }
3367 }
3368 return (1);
3369 f_err:
26c79d56 3370 ssl3_send_alert(s, SSL3_AL_FATAL, al);
0f113f3e
MC		 3371 return (0);
3372}
3373
3374/*
6e3d0153
EK		 3375 * Normally, we can tell if the server is resuming the session from
3376 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server
3377 * message after the ServerHello to determine if the server is resuming.
3378 * Therefore, we allow EAP-FAST to peek ahead.
657da85e
MC		 3379 * ssl3_check_change returns 1 if we are resuming from an external
3380 * pre-shared secret, we have a "ticket" and the next server message
3381 * is CCS; and 0 otherwise. It returns -1 upon an error.
6434abbf 3382 */
657da85e 3383static int ssl3_check_change(SSL *s)
6e3d0153
EK		 3384{
3385 int ok = 0;
3386
3387 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb ||
3388 !s->session->tlsext_tick)
3389 return 0;
3390
6e3d0153
EK		 3391 /*
3392 * This function is called when we might get a Certificate message instead,
3393 * so permit appropriate message length.
3394 * We ignore the return value as we're only interested in the message type
3395 * and not its length.
3396 */
3397 s->method->ssl_get_message(s,
3398 SSL3_ST_CR_CERT_A,
3399 SSL3_ST_CR_CERT_B,
3400 -1, s->max_cert_list, &ok);
6e3d0153
EK		 3401
3402 if (!ok)
3403 return -1;
3404
3405 s->s3->tmp.reuse_message = 1;
3406
657da85e 3407 if (s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC)
6e3d0153
EK		 3408 return 1;
3409
6e3d0153
EK		 3410 return 0;
3411}
6434abbf 3412
e481f9b9 3413#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27 3414int ssl3_send_next_proto(SSL *s)
0f113f3e
MC		 3415{
3416 unsigned int len, padding_len;
3417 unsigned char *d;
3418
3419 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) {
3420 len = s->next_proto_negotiated_len;
3421 padding_len = 32 - ((len + 2) % 32);
3422 d = (unsigned char *)s->init_buf->data;
3423 d[4] = len;
3424 memcpy(d + 5, s->next_proto_negotiated, len);
3425 d[5 + len] = padding_len;
3426 memset(d + 6 + len, 0, padding_len);
3427 *(d++) = SSL3_MT_NEXT_PROTO;
3428 l2n3(2 + len + padding_len, d);
3429 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3430 s->init_num = 4 + 2 + len + padding_len;
3431 s->init_off = 0;
3432 }
3433
3434 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3435}
6434abbf 3436#endif
368888bc
DSH		 3437
3438int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
0f113f3e
MC		 3439{
3440 int i = 0;
368888bc 3441#ifndef OPENSSL_NO_ENGINE
0f113f3e
MC		 3442 if (s->ctx->client_cert_engine) {
3443 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3444 SSL_get_client_CA_list(s),
3445 px509, ppkey, NULL, NULL, NULL);
3446 if (i != 0)
3447 return i;
3448 }
3449#endif
3450 if (s->ctx->client_cert_cb)
3451 i = s->ctx->client_cert_cb(s, px509, ppkey);
3452 return i;
3453}
d45ba43d
MC		 3454
3455int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
3456 unsigned char *p,
3457 int (*put_cb) (const SSL_CIPHER *,
3458 unsigned char *))
3459{
3460 int i, j = 0;
3461 SSL_CIPHER *c;
3462 unsigned char *q;
3463 int empty_reneg_info_scsv = !s->renegotiate;
3464 /* Set disabled masks for this session */
3465 ssl_set_client_disabled(s);
3466
3467 if (sk == NULL)
3468 return (0);
3469 q = p;
3470 if (put_cb == NULL)
3471 put_cb = s->method->put_cipher_by_char;
3472
3473 for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
3474 c = sk_SSL_CIPHER_value(sk, i);
3475 /* Skip disabled ciphers */
3476 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED))
3477 continue;
3478#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
3479 if (c->id == SSL3_CK_SCSV) {
3480 if (!empty_reneg_info_scsv)
3481 continue;
3482 else
3483 empty_reneg_info_scsv = 0;
3484 }
3485#endif
3486 j = put_cb(c, p);
3487 p += j;
3488 }
3489 /*
3490 * If p == q, no ciphers; caller indicates an error. Otherwise, add
3491 * applicable SCSVs.
3492 */
3493 if (p != q) {
3494 if (empty_reneg_info_scsv) {
3495 static SSL_CIPHER scsv = {
3496 0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3497 };
3498 j = put_cb(&scsv, p);
3499 p += j;
3500#ifdef OPENSSL_RI_DEBUG
3501 fprintf(stderr,
3502 "TLS_EMPTY_RENEGOTIATION_INFO_SCSV sent by client\n");
3503#endif
3504 }
3505 if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
3506 static SSL_CIPHER scsv = {
3507 0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3508 };
3509 j = put_cb(&scsv, p);
3510 p += j;
3511 }
3512 }
3513
3514 return (p - q);
3515}
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