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[thirdparty/openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
8 *
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).
15 *
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.
22 *
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 :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
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.
52 *
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 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
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
66 * notice, this list of conditions and the following disclaimer.
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 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
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 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
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 */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include <openssl/buffer.h>
154 #include <openssl/rand.h>
155 #include <openssl/objects.h>
156 #include <openssl/evp.h>
157 #include <openssl/md5.h>
158 #ifndef OPENSSL_NO_DH
159 # include <openssl/dh.h>
160 #endif
161 #include <openssl/bn.h>
162 #ifndef OPENSSL_NO_ENGINE
163 # include <openssl/engine.h>
164 #endif
165
166 static int ssl_set_version(SSL *s);
167 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
168 #ifndef OPENSSL_NO_TLSEXT
169 static int ssl3_check_finished(SSL *s);
170 #endif
171 static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
172 unsigned char *p,
173 int (*put_cb) (const SSL_CIPHER *,
174 unsigned char *));
175
176 #ifndef OPENSSL_NO_SSL3_METHOD
177 static const SSL_METHOD *ssl3_get_client_method(int ver)
178 {
179 if (ver == SSL3_VERSION)
180 return (SSLv3_client_method());
181 else
182 return (NULL);
183 }
184
185 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
186 ssl_undefined_function,
187 ssl3_connect, ssl3_get_client_method)
188 #endif
189 int ssl3_connect(SSL *s)
190 {
191 BUF_MEM *buf = NULL;
192 unsigned long Time = (unsigned long)time(NULL);
193 void (*cb) (const SSL *ssl, int type, int val) = NULL;
194 int ret = -1;
195 int new_state, state, skip = 0;
196
197 RAND_add(&Time, sizeof(Time), 0);
198 ERR_clear_error();
199 clear_sys_error();
200
201 if (s->info_callback != NULL)
202 cb = s->info_callback;
203 else if (s->ctx->info_callback != NULL)
204 cb = s->ctx->info_callback;
205
206 s->in_handshake++;
207 if (!SSL_in_init(s) || SSL_in_before(s)) {
208 if (!SSL_clear(s))
209 return -1;
210 }
211
212 #ifndef OPENSSL_NO_HEARTBEATS
213 /*
214 * If we're awaiting a HeartbeatResponse, pretend we already got and
215 * don't await it anymore, because Heartbeats don't make sense during
216 * handshakes anyway.
217 */
218 if (s->tlsext_hb_pending) {
219 s->tlsext_hb_pending = 0;
220 s->tlsext_hb_seq++;
221 }
222 #endif
223
224 for (;;) {
225 state = s->state;
226
227 switch (s->state) {
228 case SSL_ST_RENEGOTIATE:
229 s->renegotiate = 1;
230 s->state = SSL_ST_CONNECT;
231 s->ctx->stats.sess_connect_renegotiate++;
232 /* break */
233 case SSL_ST_BEFORE:
234 case SSL_ST_CONNECT:
235 case SSL_ST_BEFORE | SSL_ST_CONNECT:
236 case SSL_ST_OK | SSL_ST_CONNECT:
237
238 s->server = 0;
239 if (cb != NULL)
240 cb(s, SSL_CB_HANDSHAKE_START, 1);
241
242 if ((s->version >> 8) != SSL3_VERSION_MAJOR
243 && s->version != TLS_ANY_VERSION) {
244 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
245 s->state = SSL_ST_ERR;
246 ret = -1;
247 goto end;
248 }
249
250 if (s->version != TLS_ANY_VERSION &&
251 !ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
252 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
253 return -1;
254 }
255
256 /* s->version=SSL3_VERSION; */
257 s->type = SSL_ST_CONNECT;
258
259 if (s->init_buf == NULL) {
260 if ((buf = BUF_MEM_new()) == NULL) {
261 ret = -1;
262 s->state = SSL_ST_ERR;
263 goto end;
264 }
265 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
266 ret = -1;
267 s->state = SSL_ST_ERR;
268 goto end;
269 }
270 s->init_buf = buf;
271 buf = NULL;
272 }
273
274 if (!ssl3_setup_buffers(s)) {
275 ret = -1;
276 goto end;
277 }
278
279 /* setup buffing BIO */
280 if (!ssl_init_wbio_buffer(s, 0)) {
281 ret = -1;
282 s->state = SSL_ST_ERR;
283 goto end;
284 }
285
286 /* don't push the buffering BIO quite yet */
287
288 ssl3_init_finished_mac(s);
289
290 s->state = SSL3_ST_CW_CLNT_HELLO_A;
291 s->ctx->stats.sess_connect++;
292 s->init_num = 0;
293 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
294 /*
295 * Should have been reset by ssl3_get_finished, too.
296 */
297 s->s3->change_cipher_spec = 0;
298 break;
299
300 case SSL3_ST_CW_CLNT_HELLO_A:
301 case SSL3_ST_CW_CLNT_HELLO_B:
302
303 s->shutdown = 0;
304 ret = ssl3_client_hello(s);
305 if (ret <= 0)
306 goto end;
307 s->state = SSL3_ST_CR_SRVR_HELLO_A;
308 s->init_num = 0;
309
310 /* turn on buffering for the next lot of output */
311 if (s->bbio != s->wbio)
312 s->wbio = BIO_push(s->bbio, s->wbio);
313
314 break;
315
316 case SSL3_ST_CR_SRVR_HELLO_A:
317 case SSL3_ST_CR_SRVR_HELLO_B:
318 ret = ssl3_get_server_hello(s);
319 if (ret <= 0)
320 goto end;
321
322 if (s->hit) {
323 s->state = SSL3_ST_CR_FINISHED_A;
324 #ifndef OPENSSL_NO_TLSEXT
325 if (s->tlsext_ticket_expected) {
326 /* receive renewed session ticket */
327 s->state = SSL3_ST_CR_SESSION_TICKET_A;
328 }
329 #endif
330 } else {
331 s->state = SSL3_ST_CR_CERT_A;
332 }
333 s->init_num = 0;
334 break;
335 case SSL3_ST_CR_CERT_A:
336 case SSL3_ST_CR_CERT_B:
337 #ifndef OPENSSL_NO_TLSEXT
338 /* Noop (ret = 0) for everything but EAP-FAST. */
339 ret = ssl3_check_finished(s);
340 if (ret < 0)
341 goto end;
342 if (ret == 1) {
343 s->hit = 1;
344 s->state = SSL3_ST_CR_FINISHED_A;
345 s->init_num = 0;
346 break;
347 }
348 #endif
349 /* Check if it is anon DH/ECDH, SRP auth */
350 /* or PSK */
351 if (!
352 (s->s3->tmp.
353 new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
354 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
355 ret = ssl3_get_server_certificate(s);
356 if (ret <= 0)
357 goto end;
358 #ifndef OPENSSL_NO_TLSEXT
359 if (s->tlsext_status_expected)
360 s->state = SSL3_ST_CR_CERT_STATUS_A;
361 else
362 s->state = SSL3_ST_CR_KEY_EXCH_A;
363 } else {
364 skip = 1;
365 s->state = SSL3_ST_CR_KEY_EXCH_A;
366 }
367 #else
368 } else
369 skip = 1;
370
371 s->state = SSL3_ST_CR_KEY_EXCH_A;
372 #endif
373 s->init_num = 0;
374 break;
375
376 case SSL3_ST_CR_KEY_EXCH_A:
377 case SSL3_ST_CR_KEY_EXCH_B:
378 ret = ssl3_get_key_exchange(s);
379 if (ret <= 0)
380 goto end;
381 s->state = SSL3_ST_CR_CERT_REQ_A;
382 s->init_num = 0;
383
384 /*
385 * at this point we check that we have the required stuff from
386 * the server
387 */
388 if (!ssl3_check_cert_and_algorithm(s)) {
389 ret = -1;
390 s->state = SSL_ST_ERR;
391 goto end;
392 }
393 break;
394
395 case SSL3_ST_CR_CERT_REQ_A:
396 case SSL3_ST_CR_CERT_REQ_B:
397 ret = ssl3_get_certificate_request(s);
398 if (ret <= 0)
399 goto end;
400 s->state = SSL3_ST_CR_SRVR_DONE_A;
401 s->init_num = 0;
402 break;
403
404 case SSL3_ST_CR_SRVR_DONE_A:
405 case SSL3_ST_CR_SRVR_DONE_B:
406 ret = ssl3_get_server_done(s);
407 if (ret <= 0)
408 goto end;
409 #ifndef OPENSSL_NO_SRP
410 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
411 if ((ret = SRP_Calc_A_param(s)) <= 0) {
412 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC);
413 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
414 s->state = SSL_ST_ERR;
415 goto end;
416 }
417 }
418 #endif
419 if (s->s3->tmp.cert_req)
420 s->state = SSL3_ST_CW_CERT_A;
421 else
422 s->state = SSL3_ST_CW_KEY_EXCH_A;
423 s->init_num = 0;
424
425 break;
426
427 case SSL3_ST_CW_CERT_A:
428 case SSL3_ST_CW_CERT_B:
429 case SSL3_ST_CW_CERT_C:
430 case SSL3_ST_CW_CERT_D:
431 ret = ssl3_send_client_certificate(s);
432 if (ret <= 0)
433 goto end;
434 s->state = SSL3_ST_CW_KEY_EXCH_A;
435 s->init_num = 0;
436 break;
437
438 case SSL3_ST_CW_KEY_EXCH_A:
439 case SSL3_ST_CW_KEY_EXCH_B:
440 ret = ssl3_send_client_key_exchange(s);
441 if (ret <= 0)
442 goto end;
443 /*
444 * EAY EAY EAY need to check for DH fix cert sent back
445 */
446 /*
447 * For TLS, cert_req is set to 2, so a cert chain of nothing is
448 * sent, but no verify packet is sent
449 */
450 /*
451 * XXX: For now, we do not support client authentication in ECDH
452 * cipher suites with ECDH (rather than ECDSA) certificates. We
453 * need to skip the certificate verify message when client's
454 * ECDH public key is sent inside the client certificate.
455 */
456 if (s->s3->tmp.cert_req == 1) {
457 s->state = SSL3_ST_CW_CERT_VRFY_A;
458 } else {
459 s->state = SSL3_ST_CW_CHANGE_A;
460 }
461 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
462 s->state = SSL3_ST_CW_CHANGE_A;
463 }
464
465 s->init_num = 0;
466 break;
467
468 case SSL3_ST_CW_CERT_VRFY_A:
469 case SSL3_ST_CW_CERT_VRFY_B:
470 ret = ssl3_send_client_verify(s);
471 if (ret <= 0)
472 goto end;
473 s->state = SSL3_ST_CW_CHANGE_A;
474 s->init_num = 0;
475 break;
476
477 case SSL3_ST_CW_CHANGE_A:
478 case SSL3_ST_CW_CHANGE_B:
479 ret = ssl3_send_change_cipher_spec(s,
480 SSL3_ST_CW_CHANGE_A,
481 SSL3_ST_CW_CHANGE_B);
482 if (ret <= 0)
483 goto end;
484
485 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
486 s->state = SSL3_ST_CW_FINISHED_A;
487 #else
488 if (s->s3->next_proto_neg_seen)
489 s->state = SSL3_ST_CW_NEXT_PROTO_A;
490 else
491 s->state = SSL3_ST_CW_FINISHED_A;
492 #endif
493 s->init_num = 0;
494
495 s->session->cipher = s->s3->tmp.new_cipher;
496 #ifdef OPENSSL_NO_COMP
497 s->session->compress_meth = 0;
498 #else
499 if (s->s3->tmp.new_compression == NULL)
500 s->session->compress_meth = 0;
501 else
502 s->session->compress_meth = s->s3->tmp.new_compression->id;
503 #endif
504 if (!s->method->ssl3_enc->setup_key_block(s)) {
505 ret = -1;
506 s->state = SSL_ST_ERR;
507 goto end;
508 }
509
510 if (!s->method->ssl3_enc->change_cipher_state(s,
511 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
512 {
513 ret = -1;
514 s->state = SSL_ST_ERR;
515 goto end;
516 }
517
518 break;
519
520 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
521 case SSL3_ST_CW_NEXT_PROTO_A:
522 case SSL3_ST_CW_NEXT_PROTO_B:
523 ret = ssl3_send_next_proto(s);
524 if (ret <= 0)
525 goto end;
526 s->state = SSL3_ST_CW_FINISHED_A;
527 break;
528 #endif
529
530 case SSL3_ST_CW_FINISHED_A:
531 case SSL3_ST_CW_FINISHED_B:
532 ret = ssl3_send_finished(s,
533 SSL3_ST_CW_FINISHED_A,
534 SSL3_ST_CW_FINISHED_B,
535 s->method->
536 ssl3_enc->client_finished_label,
537 s->method->
538 ssl3_enc->client_finished_label_len);
539 if (ret <= 0)
540 goto end;
541 s->state = SSL3_ST_CW_FLUSH;
542
543 /* clear flags */
544 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
545 if (s->hit) {
546 s->s3->tmp.next_state = SSL_ST_OK;
547 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
548 s->state = SSL_ST_OK;
549 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
550 s->s3->delay_buf_pop_ret = 0;
551 }
552 } else {
553 #ifndef OPENSSL_NO_TLSEXT
554 /*
555 * Allow NewSessionTicket if ticket expected
556 */
557 if (s->tlsext_ticket_expected)
558 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
559 else
560 #endif
561
562 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
563 }
564 s->init_num = 0;
565 break;
566
567 #ifndef OPENSSL_NO_TLSEXT
568 case SSL3_ST_CR_SESSION_TICKET_A:
569 case SSL3_ST_CR_SESSION_TICKET_B:
570 ret = ssl3_get_new_session_ticket(s);
571 if (ret <= 0)
572 goto end;
573 s->state = SSL3_ST_CR_FINISHED_A;
574 s->init_num = 0;
575 break;
576
577 case SSL3_ST_CR_CERT_STATUS_A:
578 case SSL3_ST_CR_CERT_STATUS_B:
579 ret = ssl3_get_cert_status(s);
580 if (ret <= 0)
581 goto end;
582 s->state = SSL3_ST_CR_KEY_EXCH_A;
583 s->init_num = 0;
584 break;
585 #endif
586
587 case SSL3_ST_CR_FINISHED_A:
588 case SSL3_ST_CR_FINISHED_B:
589 if (!s->s3->change_cipher_spec)
590 s->s3->flags |= SSL3_FLAGS_CCS_OK;
591 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
592 SSL3_ST_CR_FINISHED_B);
593 if (ret <= 0)
594 goto end;
595
596 if (s->hit)
597 s->state = SSL3_ST_CW_CHANGE_A;
598 else
599 s->state = SSL_ST_OK;
600 s->init_num = 0;
601 break;
602
603 case SSL3_ST_CW_FLUSH:
604 s->rwstate = SSL_WRITING;
605 if (BIO_flush(s->wbio) <= 0) {
606 ret = -1;
607 goto end;
608 }
609 s->rwstate = SSL_NOTHING;
610 s->state = s->s3->tmp.next_state;
611 break;
612
613 case SSL_ST_OK:
614 /* clean a few things up */
615 ssl3_cleanup_key_block(s);
616 BUF_MEM_free(s->init_buf);
617 s->init_buf = NULL;
618
619 /*
620 * If we are not 'joining' the last two packets, remove the
621 * buffering now
622 */
623 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
624 ssl_free_wbio_buffer(s);
625 /* else do it later in ssl3_write */
626
627 s->init_num = 0;
628 s->renegotiate = 0;
629 s->new_session = 0;
630
631 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
632 if (s->hit)
633 s->ctx->stats.sess_hit++;
634
635 ret = 1;
636 /* s->server=0; */
637 s->handshake_func = ssl3_connect;
638 s->ctx->stats.sess_connect_good++;
639
640 if (cb != NULL)
641 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
642
643 goto end;
644 /* break; */
645
646 case SSL_ST_ERR:
647 default:
648 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
649 ret = -1;
650 goto end;
651 /* break; */
652 }
653
654 /* did we do anything */
655 if (!s->s3->tmp.reuse_message && !skip) {
656 if (s->debug) {
657 if ((ret = BIO_flush(s->wbio)) <= 0)
658 goto end;
659 }
660
661 if ((cb != NULL) && (s->state != state)) {
662 new_state = s->state;
663 s->state = state;
664 cb(s, SSL_CB_CONNECT_LOOP, 1);
665 s->state = new_state;
666 }
667 }
668 skip = 0;
669 }
670 end:
671 s->in_handshake--;
672 BUF_MEM_free(buf);
673 if (cb != NULL)
674 cb(s, SSL_CB_CONNECT_EXIT, ret);
675 return (ret);
676 }
677
678 /*
679 * Work out what version we should be using for the initial ClientHello if
680 * the version is currently set to (D)TLS_ANY_VERSION.
681 * Returns 1 on success
682 * Returns 0 on error
683 */
684 static int ssl_set_version(SSL *s)
685 {
686 unsigned long mask, options = s->options;
687
688 if (s->method->version == TLS_ANY_VERSION) {
689 /*
690 * SSL_OP_NO_X disables all protocols above X *if* there are
691 * some protocols below X enabled. This is required in order
692 * to maintain "version capability" vector contiguous. So
693 * that if application wants to disable TLS1.0 in favour of
694 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
695 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3.
696 */
697 mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1
698 #if !defined(OPENSSL_NO_SSL3)
699 | SSL_OP_NO_SSLv3
700 #endif
701 ;
702 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
703 if (options & SSL_OP_NO_TLSv1_2) {
704 if ((options & mask) != mask) {
705 s->version = TLS1_1_VERSION;
706 } else {
707 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE);
708 return 0;
709 }
710 } else {
711 s->version = TLS1_2_VERSION;
712 }
713 #else
714 if ((options & mask) == mask) {
715 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE);
716 return 0;
717 }
718 s->version = TLS1_1_VERSION;
719 #endif
720
721 mask &= ~SSL_OP_NO_TLSv1_1;
722 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
723 s->version = TLS1_VERSION;
724 mask &= ~SSL_OP_NO_TLSv1;
725 #if !defined(OPENSSL_NO_SSL3)
726 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
727 s->version = SSL3_VERSION;
728 #endif
729
730 if (s->version != TLS1_2_VERSION && tls1_suiteb(s)) {
731 SSLerr(SSL_F_SSL_SET_VERSION,
732 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
733 return 0;
734 }
735
736 if (s->version == SSL3_VERSION && FIPS_mode()) {
737 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
738 return 0;
739 }
740
741 } else if (s->method->version == DTLS_ANY_VERSION) {
742 /* Determine which DTLS version to use */
743 /* If DTLS 1.2 disabled correct the version number */
744 if (options & SSL_OP_NO_DTLSv1_2) {
745 if (tls1_suiteb(s)) {
746 SSLerr(SSL_F_SSL_SET_VERSION,
747 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
748 return 0;
749 }
750 /*
751 * Disabling all versions is silly: return an error.
752 */
753 if (options & SSL_OP_NO_DTLSv1) {
754 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_WRONG_SSL_VERSION);
755 return 0;
756 }
757 /*
758 * Update method so we don't use any DTLS 1.2 features.
759 */
760 s->method = DTLSv1_client_method();
761 s->version = DTLS1_VERSION;
762 } else {
763 /*
764 * We only support one version: update method
765 */
766 if (options & SSL_OP_NO_DTLSv1)
767 s->method = DTLSv1_2_client_method();
768 s->version = DTLS1_2_VERSION;
769 }
770 }
771
772 s->client_version = s->version;
773
774 return 1;
775 }
776
777 int ssl3_client_hello(SSL *s)
778 {
779 unsigned char *buf;
780 unsigned char *p, *d;
781 int i;
782 unsigned long l;
783 int al = 0;
784 #ifndef OPENSSL_NO_COMP
785 int j;
786 SSL_COMP *comp;
787 #endif
788
789 buf = (unsigned char *)s->init_buf->data;
790 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
791 SSL_SESSION *sess = s->session;
792
793 /* Work out what SSL/TLS/DTLS version to use */
794 if (ssl_set_version(s) == 0)
795 goto err;
796
797 if ((sess == NULL) || (sess->ssl_version != s->version) ||
798 #ifdef OPENSSL_NO_TLSEXT
799 !sess->session_id_length ||
800 #else
801 /*
802 * In the case of EAP-FAST, we can have a pre-shared
803 * "ticket" without a session ID.
804 */
805 (!sess->session_id_length && !sess->tlsext_tick) ||
806 #endif
807 (sess->not_resumable)) {
808 if (!ssl_get_new_session(s, 0))
809 goto err;
810 }
811 /* else use the pre-loaded session */
812
813 p = s->s3->client_random;
814
815 /*
816 * for DTLS if client_random is initialized, reuse it, we are
817 * required to use same upon reply to HelloVerify
818 */
819 if (SSL_IS_DTLS(s)) {
820 size_t idx;
821 i = 1;
822 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
823 if (p[idx]) {
824 i = 0;
825 break;
826 }
827 }
828 } else
829 i = 1;
830
831 if (i && ssl_fill_hello_random(s, 0, p,
832 sizeof(s->s3->client_random)) <= 0)
833 goto err;
834
835 /* Do the message type and length last */
836 d = p = ssl_handshake_start(s);
837
838 /*-
839 * version indicates the negotiated version: for example from
840 * an SSLv2/v3 compatible client hello). The client_version
841 * field is the maximum version we permit and it is also
842 * used in RSA encrypted premaster secrets. Some servers can
843 * choke if we initially report a higher version then
844 * renegotiate to a lower one in the premaster secret. This
845 * didn't happen with TLS 1.0 as most servers supported it
846 * but it can with TLS 1.1 or later if the server only supports
847 * 1.0.
848 *
849 * Possible scenario with previous logic:
850 * 1. Client hello indicates TLS 1.2
851 * 2. Server hello says TLS 1.0
852 * 3. RSA encrypted premaster secret uses 1.2.
853 * 4. Handhaked proceeds using TLS 1.0.
854 * 5. Server sends hello request to renegotiate.
855 * 6. Client hello indicates TLS v1.0 as we now
856 * know that is maximum server supports.
857 * 7. Server chokes on RSA encrypted premaster secret
858 * containing version 1.0.
859 *
860 * For interoperability it should be OK to always use the
861 * maximum version we support in client hello and then rely
862 * on the checking of version to ensure the servers isn't
863 * being inconsistent: for example initially negotiating with
864 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
865 * client_version in client hello and not resetting it to
866 * the negotiated version.
867 */
868 *(p++) = s->client_version >> 8;
869 *(p++) = s->client_version & 0xff;
870
871 /* Random stuff */
872 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
873 p += SSL3_RANDOM_SIZE;
874
875 /* Session ID */
876 if (s->new_session)
877 i = 0;
878 else
879 i = s->session->session_id_length;
880 *(p++) = i;
881 if (i != 0) {
882 if (i > (int)sizeof(s->session->session_id)) {
883 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
884 goto err;
885 }
886 memcpy(p, s->session->session_id, i);
887 p += i;
888 }
889
890 /* cookie stuff for DTLS */
891 if (SSL_IS_DTLS(s)) {
892 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
893 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
894 goto err;
895 }
896 *(p++) = s->d1->cookie_len;
897 memcpy(p, s->d1->cookie, s->d1->cookie_len);
898 p += s->d1->cookie_len;
899 }
900
901 /* Ciphers supported */
902 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
903 if (i == 0) {
904 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
905 goto err;
906 }
907 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
908 /*
909 * Some servers hang if client hello > 256 bytes as hack workaround
910 * chop number of supported ciphers to keep it well below this if we
911 * use TLS v1.2
912 */
913 if (TLS1_get_version(s) >= TLS1_2_VERSION
914 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
915 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
916 #endif
917 s2n(i, p);
918 p += i;
919
920 /* COMPRESSION */
921 #ifdef OPENSSL_NO_COMP
922 *(p++) = 1;
923 #else
924
925 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
926 j = 0;
927 else
928 j = sk_SSL_COMP_num(s->ctx->comp_methods);
929 *(p++) = 1 + j;
930 for (i = 0; i < j; i++) {
931 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
932 *(p++) = comp->id;
933 }
934 #endif
935 *(p++) = 0; /* Add the NULL method */
936
937 #ifndef OPENSSL_NO_TLSEXT
938 /* TLS extensions */
939 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
940 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
941 goto err;
942 }
943 if ((p =
944 ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
945 &al)) == NULL) {
946 ssl3_send_alert(s, SSL3_AL_FATAL, al);
947 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
948 goto err;
949 }
950 #endif
951
952 l = p - d;
953 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l)) {
954 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
955 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
956 goto err;
957 }
958 s->state = SSL3_ST_CW_CLNT_HELLO_B;
959 }
960
961 /* SSL3_ST_CW_CLNT_HELLO_B */
962 return ssl_do_write(s);
963 err:
964 s->state = SSL_ST_ERR;
965 return (-1);
966 }
967
968 int ssl3_get_server_hello(SSL *s)
969 {
970 STACK_OF(SSL_CIPHER) *sk;
971 const SSL_CIPHER *c;
972 CERT *ct = s->cert;
973 unsigned char *p, *d;
974 int i, al = SSL_AD_INTERNAL_ERROR, ok;
975 unsigned int j;
976 long n;
977 #ifndef OPENSSL_NO_COMP
978 SSL_COMP *comp;
979 #endif
980 /*
981 * Hello verify request and/or server hello version may not match so set
982 * first packet if we're negotiating version.
983 */
984 if (SSL_IS_DTLS(s))
985 s->first_packet = 1;
986
987 n = s->method->ssl_get_message(s,
988 SSL3_ST_CR_SRVR_HELLO_A,
989 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
990
991 if (!ok)
992 return ((int)n);
993
994 if (SSL_IS_DTLS(s)) {
995 s->first_packet = 0;
996 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
997 if (s->d1->send_cookie == 0) {
998 s->s3->tmp.reuse_message = 1;
999 return 1;
1000 } else { /* already sent a cookie */
1001
1002 al = SSL_AD_UNEXPECTED_MESSAGE;
1003 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
1004 goto f_err;
1005 }
1006 }
1007 }
1008
1009 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
1010 al = SSL_AD_UNEXPECTED_MESSAGE;
1011 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
1012 goto f_err;
1013 }
1014
1015 d = p = (unsigned char *)s->init_msg;
1016
1017 if (s->method->version == TLS_ANY_VERSION) {
1018 int sversion = (p[0] << 8) | p[1];
1019
1020 #if TLS_MAX_VERSION != TLS1_2_VERSION
1021 #error Code needs updating for new TLS version
1022 #endif
1023 #ifndef OPENSSL_NO_SSL3
1024 if ((sversion == SSL3_VERSION) && !(s->options & SSL_OP_NO_SSLv3)) {
1025 if (FIPS_mode()) {
1026 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1027 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
1028 al = SSL_AD_PROTOCOL_VERSION;
1029 goto f_err;
1030 }
1031 s->method = SSLv3_client_method();
1032 } else
1033 #endif
1034 if ((sversion == TLS1_VERSION) && !(s->options & SSL_OP_NO_TLSv1)) {
1035 s->method = TLSv1_client_method();
1036 } else if ((sversion == TLS1_1_VERSION) &&
1037 !(s->options & SSL_OP_NO_TLSv1_1)) {
1038 s->method = TLSv1_1_client_method();
1039 } else if ((sversion == TLS1_2_VERSION) &&
1040 !(s->options & SSL_OP_NO_TLSv1_2)) {
1041 s->method = TLSv1_2_client_method();
1042 } else {
1043 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
1044 al = SSL_AD_PROTOCOL_VERSION;
1045 goto f_err;
1046 }
1047 s->session->ssl_version = s->version = s->method->version;
1048
1049 if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
1050 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_VERSION_TOO_LOW);
1051 al = SSL_AD_PROTOCOL_VERSION;
1052 goto f_err;
1053 }
1054 } else if (s->method->version == DTLS_ANY_VERSION) {
1055 /* Work out correct protocol version to use */
1056 int hversion = (p[0] << 8) | p[1];
1057 int options = s->options;
1058 if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2))
1059 s->method = DTLSv1_2_client_method();
1060 else if (tls1_suiteb(s)) {
1061 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1062 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1063 s->version = hversion;
1064 al = SSL_AD_PROTOCOL_VERSION;
1065 goto f_err;
1066 } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1))
1067 s->method = DTLSv1_client_method();
1068 else {
1069 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
1070 s->version = hversion;
1071 al = SSL_AD_PROTOCOL_VERSION;
1072 goto f_err;
1073 }
1074 s->version = s->method->version;
1075 } else if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
1076 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
1077 s->version = (s->version & 0xff00) | p[1];
1078 al = SSL_AD_PROTOCOL_VERSION;
1079 goto f_err;
1080 }
1081 p += 2;
1082
1083 /* load the server hello data */
1084 /* load the server random */
1085 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
1086 p += SSL3_RANDOM_SIZE;
1087
1088 s->hit = 0;
1089
1090 /* get the session-id */
1091 j = *(p++);
1092
1093 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
1094 al = SSL_AD_ILLEGAL_PARAMETER;
1095 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
1096 goto f_err;
1097 }
1098 #ifndef OPENSSL_NO_TLSEXT
1099 /*
1100 * Check if we can resume the session based on external pre-shared secret.
1101 * EAP-FAST (RFC 4851) supports two types of session resumption.
1102 * Resumption based on server-side state works with session IDs.
1103 * Resumption based on pre-shared Protected Access Credentials (PACs)
1104 * works by overriding the SessionTicket extension at the application
1105 * layer, and does not send a session ID. (We do not know whether EAP-FAST
1106 * servers would honour the session ID.) Therefore, the session ID alone
1107 * is not a reliable indicator of session resumption, so we first check if
1108 * we can resume, and later peek at the next handshake message to see if the
1109 * server wants to resume.
1110 */
1111 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb &&
1112 s->session->tlsext_tick) {
1113 SSL_CIPHER *pref_cipher = NULL;
1114 s->session->master_key_length = sizeof(s->session->master_key);
1115 if (s->tls_session_secret_cb(s, s->session->master_key,
1116 &s->session->master_key_length,
1117 NULL, &pref_cipher,
1118 s->tls_session_secret_cb_arg)) {
1119 s->session->cipher = pref_cipher ?
1120 pref_cipher : ssl_get_cipher_by_char(s, p + j);
1121 } else {
1122 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1123 al = SSL_AD_INTERNAL_ERROR;
1124 goto f_err;
1125 }
1126 }
1127 #endif /* OPENSSL_NO_TLSEXT */
1128
1129 if (j != 0 && j == s->session->session_id_length
1130 && memcmp(p, s->session->session_id, j) == 0) {
1131 if (s->sid_ctx_length != s->session->sid_ctx_length
1132 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
1133 /* actually a client application bug */
1134 al = SSL_AD_ILLEGAL_PARAMETER;
1135 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1136 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1137 goto f_err;
1138 }
1139 s->hit = 1;
1140 } else {
1141 /*
1142 * If we were trying for session-id reuse but the server
1143 * didn't echo the ID, make a new SSL_SESSION.
1144 * In the case of EAP-FAST and PAC, we do not send a session ID,
1145 * so the PAC-based session secret is always preserved. It'll be
1146 * overwritten if the server refuses resumption.
1147 */
1148 if (s->session->session_id_length > 0) {
1149 if (!ssl_get_new_session(s, 0)) {
1150 goto f_err;
1151 }
1152 }
1153 s->session->session_id_length = j;
1154 memcpy(s->session->session_id, p, j); /* j could be 0 */
1155 }
1156 p += j;
1157 c = ssl_get_cipher_by_char(s, p);
1158 if (c == NULL) {
1159 /* unknown cipher */
1160 al = SSL_AD_ILLEGAL_PARAMETER;
1161 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
1162 goto f_err;
1163 }
1164 /* Set version disabled mask now we know version */
1165 if (!SSL_USE_TLS1_2_CIPHERS(s))
1166 ct->mask_ssl = SSL_TLSV1_2;
1167 else
1168 ct->mask_ssl = 0;
1169 /*
1170 * If it is a disabled cipher we didn't send it in client hello, so
1171 * return an error.
1172 */
1173 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) {
1174 al = SSL_AD_ILLEGAL_PARAMETER;
1175 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1176 goto f_err;
1177 }
1178 p += ssl_put_cipher_by_char(s, NULL, NULL);
1179
1180 sk = ssl_get_ciphers_by_id(s);
1181 i = sk_SSL_CIPHER_find(sk, c);
1182 if (i < 0) {
1183 /* we did not say we would use this cipher */
1184 al = SSL_AD_ILLEGAL_PARAMETER;
1185 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1186 goto f_err;
1187 }
1188
1189 /*
1190 * Depending on the session caching (internal/external), the cipher
1191 * and/or cipher_id values may not be set. Make sure that cipher_id is
1192 * set and use it for comparison.
1193 */
1194 if (s->session->cipher)
1195 s->session->cipher_id = s->session->cipher->id;
1196 if (s->hit && (s->session->cipher_id != c->id)) {
1197 al = SSL_AD_ILLEGAL_PARAMETER;
1198 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1199 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1200 goto f_err;
1201 }
1202 s->s3->tmp.new_cipher = c;
1203 /*
1204 * Don't digest cached records if no sigalgs: we may need them for client
1205 * authentication.
1206 */
1207 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1208 goto f_err;
1209 /* lets get the compression algorithm */
1210 /* COMPRESSION */
1211 #ifdef OPENSSL_NO_COMP
1212 if (*(p++) != 0) {
1213 al = SSL_AD_ILLEGAL_PARAMETER;
1214 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1215 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1216 goto f_err;
1217 }
1218 /*
1219 * If compression is disabled we'd better not try to resume a session
1220 * using compression.
1221 */
1222 if (s->session->compress_meth != 0) {
1223 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1224 goto f_err;
1225 }
1226 #else
1227 j = *(p++);
1228 if (s->hit && j != s->session->compress_meth) {
1229 al = SSL_AD_ILLEGAL_PARAMETER;
1230 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1231 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1232 goto f_err;
1233 }
1234 if (j == 0)
1235 comp = NULL;
1236 else if (!ssl_allow_compression(s)) {
1237 al = SSL_AD_ILLEGAL_PARAMETER;
1238 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
1239 goto f_err;
1240 } else
1241 comp = ssl3_comp_find(s->ctx->comp_methods, j);
1242
1243 if ((j != 0) && (comp == NULL)) {
1244 al = SSL_AD_ILLEGAL_PARAMETER;
1245 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1246 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1247 goto f_err;
1248 } else {
1249 s->s3->tmp.new_compression = comp;
1250 }
1251 #endif
1252
1253 #ifndef OPENSSL_NO_TLSEXT
1254 /* TLS extensions */
1255 if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) {
1256 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
1257 goto err;
1258 }
1259 #endif
1260
1261 if (p != (d + n)) {
1262 /* wrong packet length */
1263 al = SSL_AD_DECODE_ERROR;
1264 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
1265 goto f_err;
1266 }
1267
1268 return (1);
1269 f_err:
1270 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1271 err:
1272 s->state = SSL_ST_ERR;
1273 return (-1);
1274 }
1275
1276 int ssl3_get_server_certificate(SSL *s)
1277 {
1278 int al, i, ok, ret = -1, exp_idx;
1279 unsigned long n, nc, llen, l;
1280 X509 *x = NULL;
1281 const unsigned char *q, *p;
1282 unsigned char *d;
1283 STACK_OF(X509) *sk = NULL;
1284 SESS_CERT *sc;
1285 EVP_PKEY *pkey = NULL;
1286
1287 n = s->method->ssl_get_message(s,
1288 SSL3_ST_CR_CERT_A,
1289 SSL3_ST_CR_CERT_B,
1290 -1, s->max_cert_list, &ok);
1291
1292 if (!ok)
1293 return ((int)n);
1294
1295 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) {
1296 s->s3->tmp.reuse_message = 1;
1297 return (1);
1298 }
1299
1300 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1301 al = SSL_AD_UNEXPECTED_MESSAGE;
1302 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
1303 goto f_err;
1304 }
1305 p = d = (unsigned char *)s->init_msg;
1306
1307 if ((sk = sk_X509_new_null()) == NULL) {
1308 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1309 goto err;
1310 }
1311
1312 n2l3(p, llen);
1313 if (llen + 3 != n) {
1314 al = SSL_AD_DECODE_ERROR;
1315 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
1316 goto f_err;
1317 }
1318 for (nc = 0; nc < llen;) {
1319 n2l3(p, l);
1320 if ((l + nc + 3) > llen) {
1321 al = SSL_AD_DECODE_ERROR;
1322 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1323 SSL_R_CERT_LENGTH_MISMATCH);
1324 goto f_err;
1325 }
1326
1327 q = p;
1328 x = d2i_X509(NULL, &q, l);
1329 if (x == NULL) {
1330 al = SSL_AD_BAD_CERTIFICATE;
1331 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
1332 goto f_err;
1333 }
1334 if (q != (p + l)) {
1335 al = SSL_AD_DECODE_ERROR;
1336 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1337 SSL_R_CERT_LENGTH_MISMATCH);
1338 goto f_err;
1339 }
1340 if (!sk_X509_push(sk, x)) {
1341 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1342 goto err;
1343 }
1344 x = NULL;
1345 nc += l + 3;
1346 p = q;
1347 }
1348
1349 i = ssl_verify_cert_chain(s, sk);
1350 if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) {
1351 al = ssl_verify_alarm_type(s->verify_result);
1352 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1353 SSL_R_CERTIFICATE_VERIFY_FAILED);
1354 goto f_err;
1355 }
1356 ERR_clear_error(); /* but we keep s->verify_result */
1357 if (i > 1) {
1358 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1359 al = SSL_AD_HANDSHAKE_FAILURE;
1360 goto f_err;
1361 }
1362
1363 sc = ssl_sess_cert_new();
1364 if (sc == NULL)
1365 goto err;
1366
1367 ssl_sess_cert_free(s->session->sess_cert);
1368 s->session->sess_cert = sc;
1369
1370 sc->cert_chain = sk;
1371 /*
1372 * Inconsistency alert: cert_chain does include the peer's certificate,
1373 * which we don't include in s3_srvr.c
1374 */
1375 x = sk_X509_value(sk, 0);
1376 sk = NULL;
1377 /*
1378 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1379 */
1380
1381 pkey = X509_get_pubkey(x);
1382
1383 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
1384 x = NULL;
1385 al = SSL3_AL_FATAL;
1386 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1387 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1388 goto f_err;
1389 }
1390
1391 i = ssl_cert_type(x, pkey);
1392 if (i < 0) {
1393 x = NULL;
1394 al = SSL3_AL_FATAL;
1395 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1396 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1397 goto f_err;
1398 }
1399
1400 exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1401 if (exp_idx >= 0 && i != exp_idx) {
1402 x = NULL;
1403 al = SSL_AD_ILLEGAL_PARAMETER;
1404 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1405 SSL_R_WRONG_CERTIFICATE_TYPE);
1406 goto f_err;
1407 }
1408 sc->peer_cert_type = i;
1409 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1410 /*
1411 * Why would the following ever happen? We just created sc a couple
1412 * of lines ago.
1413 */
1414 X509_free(sc->peer_pkeys[i].x509);
1415 sc->peer_pkeys[i].x509 = x;
1416 sc->peer_key = &(sc->peer_pkeys[i]);
1417
1418 X509_free(s->session->peer);
1419 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1420 s->session->peer = x;
1421 s->session->verify_result = s->verify_result;
1422
1423 x = NULL;
1424 ret = 1;
1425 goto done;
1426
1427 f_err:
1428 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1429 err:
1430 s->state = SSL_ST_ERR;
1431 done:
1432 EVP_PKEY_free(pkey);
1433 X509_free(x);
1434 sk_X509_pop_free(sk, X509_free);
1435 return (ret);
1436 }
1437
1438 int ssl3_get_key_exchange(SSL *s)
1439 {
1440 #ifndef OPENSSL_NO_RSA
1441 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1442 #endif
1443 EVP_MD_CTX md_ctx;
1444 unsigned char *param, *p;
1445 int al, j, ok;
1446 long i, param_len, n, alg_k, alg_a;
1447 EVP_PKEY *pkey = NULL;
1448 const EVP_MD *md = NULL;
1449 #ifndef OPENSSL_NO_RSA
1450 RSA *rsa = NULL;
1451 #endif
1452 #ifndef OPENSSL_NO_DH
1453 DH *dh = NULL;
1454 #endif
1455 #ifndef OPENSSL_NO_EC
1456 EC_KEY *ecdh = NULL;
1457 BN_CTX *bn_ctx = NULL;
1458 EC_POINT *srvr_ecpoint = NULL;
1459 int curve_nid = 0;
1460 int encoded_pt_len = 0;
1461 #endif
1462
1463 EVP_MD_CTX_init(&md_ctx);
1464
1465 /*
1466 * use same message size as in ssl3_get_certificate_request() as
1467 * ServerKeyExchange message may be skipped
1468 */
1469 n = s->method->ssl_get_message(s,
1470 SSL3_ST_CR_KEY_EXCH_A,
1471 SSL3_ST_CR_KEY_EXCH_B,
1472 -1, s->max_cert_list, &ok);
1473 if (!ok)
1474 return ((int)n);
1475
1476 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1477
1478 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1479 /*
1480 * Can't skip server key exchange if this is an ephemeral
1481 * ciphersuite.
1482 */
1483 if (alg_k & (SSL_kDHE | SSL_kECDHE)) {
1484 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1485 al = SSL_AD_UNEXPECTED_MESSAGE;
1486 goto f_err;
1487 }
1488 #ifndef OPENSSL_NO_PSK
1489 /*
1490 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no
1491 * identity hint is sent. Set session->sess_cert anyway to avoid
1492 * problems later.
1493 */
1494 if (alg_k & SSL_kPSK) {
1495 s->session->sess_cert = ssl_sess_cert_new();
1496 OPENSSL_free(s->ctx->psk_identity_hint);
1497 s->ctx->psk_identity_hint = NULL;
1498 }
1499 #endif
1500 s->s3->tmp.reuse_message = 1;
1501 return (1);
1502 }
1503
1504 param = p = (unsigned char *)s->init_msg;
1505 if (s->session->sess_cert != NULL) {
1506 #ifndef OPENSSL_NO_RSA
1507 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1508 s->session->sess_cert->peer_rsa_tmp = NULL;
1509 #endif
1510 #ifndef OPENSSL_NO_DH
1511 DH_free(s->session->sess_cert->peer_dh_tmp);
1512 s->session->sess_cert->peer_dh_tmp = NULL;
1513 #endif
1514 #ifndef OPENSSL_NO_EC
1515 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1516 s->session->sess_cert->peer_ecdh_tmp = NULL;
1517 #endif
1518 } else {
1519 s->session->sess_cert = ssl_sess_cert_new();
1520 }
1521
1522 /* Total length of the parameters including the length prefix */
1523 param_len = 0;
1524
1525 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1526
1527 al = SSL_AD_DECODE_ERROR;
1528
1529 #ifndef OPENSSL_NO_PSK
1530 if (alg_k & SSL_kPSK) {
1531 char tmp_id_hint[PSK_MAX_IDENTITY_LEN + 1];
1532
1533 param_len = 2;
1534 if (param_len > n) {
1535 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1536 goto f_err;
1537 }
1538 n2s(p, i);
1539
1540 /*
1541 * Store PSK identity hint for later use, hint is used in
1542 * ssl3_send_client_key_exchange. Assume that the maximum length of
1543 * a PSK identity hint can be as long as the maximum length of a PSK
1544 * identity.
1545 */
1546 if (i > PSK_MAX_IDENTITY_LEN) {
1547 al = SSL_AD_HANDSHAKE_FAILURE;
1548 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
1549 goto f_err;
1550 }
1551 if (i > n - param_len) {
1552 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1553 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1554 goto f_err;
1555 }
1556 param_len += i;
1557
1558 /*
1559 * If received PSK identity hint contains NULL characters, the hint
1560 * is truncated from the first NULL. p may not be ending with NULL,
1561 * so create a NULL-terminated string.
1562 */
1563 memcpy(tmp_id_hint, p, i);
1564 memset(tmp_id_hint + i, 0, PSK_MAX_IDENTITY_LEN + 1 - i);
1565 OPENSSL_free(s->ctx->psk_identity_hint);
1566 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1567 if (s->ctx->psk_identity_hint == NULL) {
1568 al = SSL_AD_HANDSHAKE_FAILURE;
1569 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1570 goto f_err;
1571 }
1572
1573 p += i;
1574 n -= param_len;
1575 } else
1576 #endif /* !OPENSSL_NO_PSK */
1577 #ifndef OPENSSL_NO_SRP
1578 if (alg_k & SSL_kSRP) {
1579 param_len = 2;
1580 if (param_len > n) {
1581 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1582 goto f_err;
1583 }
1584 n2s(p, i);
1585
1586 if (i > n - param_len) {
1587 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
1588 goto f_err;
1589 }
1590 param_len += i;
1591
1592 if ((s->srp_ctx.N = BN_bin2bn(p, i, NULL)) == NULL) {
1593 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1594 goto err;
1595 }
1596 p += i;
1597
1598 if (2 > n - param_len) {
1599 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1600 goto f_err;
1601 }
1602 param_len += 2;
1603
1604 n2s(p, i);
1605
1606 if (i > n - param_len) {
1607 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
1608 goto f_err;
1609 }
1610 param_len += i;
1611
1612 if ((s->srp_ctx.g = BN_bin2bn(p, i, NULL)) == NULL) {
1613 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1614 goto err;
1615 }
1616 p += i;
1617
1618 if (1 > n - param_len) {
1619 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1620 goto f_err;
1621 }
1622 param_len += 1;
1623
1624 i = (unsigned int)(p[0]);
1625 p++;
1626
1627 if (i > n - param_len) {
1628 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
1629 goto f_err;
1630 }
1631 param_len += i;
1632
1633 if ((s->srp_ctx.s = BN_bin2bn(p, i, NULL)) == NULL) {
1634 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1635 goto err;
1636 }
1637 p += i;
1638
1639 if (2 > n - param_len) {
1640 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1641 goto f_err;
1642 }
1643 param_len += 2;
1644
1645 n2s(p, i);
1646
1647 if (i > n - param_len) {
1648 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
1649 goto f_err;
1650 }
1651 param_len += i;
1652
1653 if ((s->srp_ctx.B = BN_bin2bn(p, i, NULL)) == NULL) {
1654 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1655 goto err;
1656 }
1657 p += i;
1658 n -= param_len;
1659
1660 if (!srp_verify_server_param(s, &al)) {
1661 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
1662 goto f_err;
1663 }
1664
1665 /* We must check if there is a certificate */
1666 # ifndef OPENSSL_NO_RSA
1667 if (alg_a & SSL_aRSA)
1668 pkey =
1669 X509_get_pubkey(s->session->
1670 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1671 # else
1672 if (0) ;
1673 # endif
1674 # ifndef OPENSSL_NO_DSA
1675 else if (alg_a & SSL_aDSS)
1676 pkey =
1677 X509_get_pubkey(s->session->
1678 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1679 x509);
1680 # endif
1681 } else
1682 #endif /* !OPENSSL_NO_SRP */
1683 #ifndef OPENSSL_NO_RSA
1684 if (alg_k & SSL_kRSA) {
1685 /* Temporary RSA keys only allowed in export ciphersuites */
1686 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1687 al = SSL_AD_UNEXPECTED_MESSAGE;
1688 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1689 goto f_err;
1690 }
1691 if ((rsa = RSA_new()) == NULL) {
1692 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1693 goto err;
1694 }
1695
1696 param_len = 2;
1697 if (param_len > n) {
1698 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1699 goto f_err;
1700 }
1701 n2s(p, i);
1702
1703 if (i > n - param_len) {
1704 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1705 goto f_err;
1706 }
1707 param_len += i;
1708
1709 if ((rsa->n = BN_bin2bn(p, i, rsa->n)) == NULL) {
1710 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1711 goto err;
1712 }
1713 p += i;
1714
1715 if (2 > n - param_len) {
1716 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1717 goto f_err;
1718 }
1719 param_len += 2;
1720
1721 n2s(p, i);
1722
1723 if (i > n - param_len) {
1724 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1725 goto f_err;
1726 }
1727 param_len += i;
1728
1729 if ((rsa->e = BN_bin2bn(p, i, rsa->e)) == NULL) {
1730 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1731 goto err;
1732 }
1733 p += i;
1734 n -= param_len;
1735
1736 /* this should be because we are using an export cipher */
1737 if (alg_a & SSL_aRSA)
1738 pkey =
1739 X509_get_pubkey(s->session->
1740 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1741 else {
1742 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1743 goto err;
1744 }
1745 s->session->sess_cert->peer_rsa_tmp = rsa;
1746 rsa = NULL;
1747 }
1748 #else /* OPENSSL_NO_RSA */
1749 if (0) ;
1750 #endif
1751 #ifndef OPENSSL_NO_DH
1752 else if (alg_k & SSL_kDHE) {
1753 if ((dh = DH_new()) == NULL) {
1754 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1755 goto err;
1756 }
1757
1758 param_len = 2;
1759 if (param_len > n) {
1760 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1761 goto f_err;
1762 }
1763 n2s(p, i);
1764
1765 if (i > n - param_len) {
1766 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1767 goto f_err;
1768 }
1769 param_len += i;
1770
1771 if ((dh->p = BN_bin2bn(p, i, NULL)) == NULL) {
1772 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1773 goto err;
1774 }
1775 p += i;
1776
1777 if (2 > n - param_len) {
1778 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1779 goto f_err;
1780 }
1781 param_len += 2;
1782
1783 n2s(p, i);
1784
1785 if (i > n - param_len) {
1786 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1787 goto f_err;
1788 }
1789 param_len += i;
1790
1791 if ((dh->g = BN_bin2bn(p, i, NULL)) == NULL) {
1792 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1793 goto err;
1794 }
1795 p += i;
1796
1797 if (2 > n - param_len) {
1798 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1799 goto f_err;
1800 }
1801 param_len += 2;
1802
1803 n2s(p, i);
1804
1805 if (i > n - param_len) {
1806 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1807 goto f_err;
1808 }
1809 param_len += i;
1810
1811 if ((dh->pub_key = BN_bin2bn(p, i, NULL)) == NULL) {
1812 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1813 goto err;
1814 }
1815 p += i;
1816 n -= param_len;
1817
1818 if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) {
1819 al = SSL_AD_HANDSHAKE_FAILURE;
1820 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DH_KEY_TOO_SMALL);
1821 goto f_err;
1822 }
1823 # ifndef OPENSSL_NO_RSA
1824 if (alg_a & SSL_aRSA)
1825 pkey =
1826 X509_get_pubkey(s->session->
1827 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1828 # else
1829 if (0) ;
1830 # endif
1831 # ifndef OPENSSL_NO_DSA
1832 else if (alg_a & SSL_aDSS)
1833 pkey =
1834 X509_get_pubkey(s->session->
1835 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1836 x509);
1837 # endif
1838 /* else anonymous DH, so no certificate or pkey. */
1839
1840 s->session->sess_cert->peer_dh_tmp = dh;
1841 dh = NULL;
1842 }
1843 #endif /* !OPENSSL_NO_DH */
1844
1845 #ifndef OPENSSL_NO_EC
1846 else if (alg_k & SSL_kECDHE) {
1847 EC_GROUP *ngroup;
1848 const EC_GROUP *group;
1849
1850 if ((ecdh = EC_KEY_new()) == NULL) {
1851 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1852 goto err;
1853 }
1854
1855 /*
1856 * Extract elliptic curve parameters and the server's ephemeral ECDH
1857 * public key. Keep accumulating lengths of various components in
1858 * param_len and make sure it never exceeds n.
1859 */
1860
1861 /*
1862 * XXX: For now we only support named (not generic) curves and the
1863 * ECParameters in this case is just three bytes. We also need one
1864 * byte for the length of the encoded point
1865 */
1866 param_len = 4;
1867 if (param_len > n) {
1868 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1869 goto f_err;
1870 }
1871 /*
1872 * Check curve is one of our preferences, if not server has sent an
1873 * invalid curve. ECParameters is 3 bytes.
1874 */
1875 if (!tls1_check_curve(s, p, 3)) {
1876 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
1877 goto f_err;
1878 }
1879
1880 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) {
1881 al = SSL_AD_INTERNAL_ERROR;
1882 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1883 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1884 goto f_err;
1885 }
1886
1887 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1888 if (ngroup == NULL) {
1889 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1890 goto err;
1891 }
1892 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1893 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1894 goto err;
1895 }
1896 EC_GROUP_free(ngroup);
1897
1898 group = EC_KEY_get0_group(ecdh);
1899
1900 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1901 (EC_GROUP_get_degree(group) > 163)) {
1902 al = SSL_AD_EXPORT_RESTRICTION;
1903 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1904 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1905 goto f_err;
1906 }
1907
1908 p += 3;
1909
1910 /* Next, get the encoded ECPoint */
1911 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1912 ((bn_ctx = BN_CTX_new()) == NULL)) {
1913 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1914 goto err;
1915 }
1916
1917 encoded_pt_len = *p; /* length of encoded point */
1918 p += 1;
1919
1920 if ((encoded_pt_len > n - param_len) ||
1921 (EC_POINT_oct2point(group, srvr_ecpoint,
1922 p, encoded_pt_len, bn_ctx) == 0)) {
1923 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1924 goto f_err;
1925 }
1926 param_len += encoded_pt_len;
1927
1928 n -= param_len;
1929 p += encoded_pt_len;
1930
1931 /*
1932 * The ECC/TLS specification does not mention the use of DSA to sign
1933 * ECParameters in the server key exchange message. We do support RSA
1934 * and ECDSA.
1935 */
1936 if (0) ;
1937 # ifndef OPENSSL_NO_RSA
1938 else if (alg_a & SSL_aRSA)
1939 pkey =
1940 X509_get_pubkey(s->session->
1941 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1942 # endif
1943 # ifndef OPENSSL_NO_EC
1944 else if (alg_a & SSL_aECDSA)
1945 pkey =
1946 X509_get_pubkey(s->session->
1947 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1948 # endif
1949 /* else anonymous ECDH, so no certificate or pkey. */
1950 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1951 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1952 ecdh = NULL;
1953 BN_CTX_free(bn_ctx);
1954 bn_ctx = NULL;
1955 EC_POINT_free(srvr_ecpoint);
1956 srvr_ecpoint = NULL;
1957 } else if (alg_k) {
1958 al = SSL_AD_UNEXPECTED_MESSAGE;
1959 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1960 goto f_err;
1961 }
1962 #endif /* !OPENSSL_NO_EC */
1963
1964 /* p points to the next byte, there are 'n' bytes left */
1965
1966 /* if it was signed, check the signature */
1967 if (pkey != NULL) {
1968 if (SSL_USE_SIGALGS(s)) {
1969 int rv;
1970 if (2 > n) {
1971 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1972 goto f_err;
1973 }
1974 rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1975 if (rv == -1)
1976 goto err;
1977 else if (rv == 0) {
1978 goto f_err;
1979 }
1980 #ifdef SSL_DEBUG
1981 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1982 #endif
1983 p += 2;
1984 n -= 2;
1985 } else
1986 md = EVP_sha1();
1987
1988 if (2 > n) {
1989 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1990 goto f_err;
1991 }
1992 n2s(p, i);
1993 n -= 2;
1994 j = EVP_PKEY_size(pkey);
1995
1996 /*
1997 * Check signature length. If n is 0 then signature is empty
1998 */
1999 if ((i != n) || (n > j) || (n <= 0)) {
2000 /* wrong packet length */
2001 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
2002 goto f_err;
2003 }
2004 #ifndef OPENSSL_NO_RSA
2005 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
2006 int num;
2007 unsigned int size;
2008
2009 j = 0;
2010 q = md_buf;
2011 for (num = 2; num > 0; num--) {
2012 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2013 EVP_DigestInit_ex(&md_ctx, (num == 2)
2014 ? s->ctx->md5 : s->ctx->sha1, NULL);
2015 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
2016 SSL3_RANDOM_SIZE);
2017 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
2018 SSL3_RANDOM_SIZE);
2019 EVP_DigestUpdate(&md_ctx, param, param_len);
2020 EVP_DigestFinal_ex(&md_ctx, q, &size);
2021 q += size;
2022 j += size;
2023 }
2024 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
2025 if (i < 0) {
2026 al = SSL_AD_DECRYPT_ERROR;
2027 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
2028 goto f_err;
2029 }
2030 if (i == 0) {
2031 /* bad signature */
2032 al = SSL_AD_DECRYPT_ERROR;
2033 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
2034 goto f_err;
2035 }
2036 } else
2037 #endif
2038 {
2039 EVP_VerifyInit_ex(&md_ctx, md, NULL);
2040 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
2041 SSL3_RANDOM_SIZE);
2042 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
2043 SSL3_RANDOM_SIZE);
2044 EVP_VerifyUpdate(&md_ctx, param, param_len);
2045 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
2046 /* bad signature */
2047 al = SSL_AD_DECRYPT_ERROR;
2048 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
2049 goto f_err;
2050 }
2051 }
2052 } else {
2053 /* aNULL, aSRP or kPSK do not need public keys */
2054 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) {
2055 /* Might be wrong key type, check it */
2056 if (ssl3_check_cert_and_algorithm(s))
2057 /* Otherwise this shouldn't happen */
2058 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2059 goto err;
2060 }
2061 /* still data left over */
2062 if (n != 0) {
2063 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
2064 goto f_err;
2065 }
2066 }
2067 EVP_PKEY_free(pkey);
2068 EVP_MD_CTX_cleanup(&md_ctx);
2069 return (1);
2070 f_err:
2071 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2072 err:
2073 EVP_PKEY_free(pkey);
2074 #ifndef OPENSSL_NO_RSA
2075 RSA_free(rsa);
2076 #endif
2077 #ifndef OPENSSL_NO_DH
2078 DH_free(dh);
2079 #endif
2080 #ifndef OPENSSL_NO_EC
2081 BN_CTX_free(bn_ctx);
2082 EC_POINT_free(srvr_ecpoint);
2083 EC_KEY_free(ecdh);
2084 #endif
2085 EVP_MD_CTX_cleanup(&md_ctx);
2086 s->state = SSL_ST_ERR;
2087 return (-1);
2088 }
2089
2090 int ssl3_get_certificate_request(SSL *s)
2091 {
2092 int ok, ret = 0;
2093 unsigned long n, nc, l;
2094 unsigned int llen, ctype_num, i;
2095 X509_NAME *xn = NULL;
2096 const unsigned char *p, *q;
2097 unsigned char *d;
2098 STACK_OF(X509_NAME) *ca_sk = NULL;
2099
2100 n = s->method->ssl_get_message(s,
2101 SSL3_ST_CR_CERT_REQ_A,
2102 SSL3_ST_CR_CERT_REQ_B,
2103 -1, s->max_cert_list, &ok);
2104
2105 if (!ok)
2106 return ((int)n);
2107
2108 s->s3->tmp.cert_req = 0;
2109
2110 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
2111 s->s3->tmp.reuse_message = 1;
2112 /*
2113 * If we get here we don't need any cached handshake records as we
2114 * wont be doing client auth.
2115 */
2116 if (s->s3->handshake_buffer) {
2117 if (!ssl3_digest_cached_records(s))
2118 goto err;
2119 }
2120 return (1);
2121 }
2122
2123 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
2124 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2125 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
2126 goto err;
2127 }
2128
2129 /* TLS does not like anon-DH with client cert */
2130 if (s->version > SSL3_VERSION) {
2131 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
2132 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2133 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2134 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2135 goto err;
2136 }
2137 }
2138
2139 p = d = (unsigned char *)s->init_msg;
2140
2141 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
2142 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2143 goto err;
2144 }
2145
2146 /* get the certificate types */
2147 ctype_num = *(p++);
2148 OPENSSL_free(s->cert->ctypes);
2149 s->cert->ctypes = NULL;
2150 if (ctype_num > SSL3_CT_NUMBER) {
2151 /* If we exceed static buffer copy all to cert structure */
2152 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2153 if (s->cert->ctypes == NULL) {
2154 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2155 goto err;
2156 }
2157 memcpy(s->cert->ctypes, p, ctype_num);
2158 s->cert->ctype_num = (size_t)ctype_num;
2159 ctype_num = SSL3_CT_NUMBER;
2160 }
2161 for (i = 0; i < ctype_num; i++)
2162 s->s3->tmp.ctype[i] = p[i];
2163 p += p[-1];
2164 if (SSL_USE_SIGALGS(s)) {
2165 n2s(p, llen);
2166 /*
2167 * Check we have enough room for signature algorithms and following
2168 * length value.
2169 */
2170 if ((unsigned long)(p - d + llen + 2) > n) {
2171 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2172 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2173 SSL_R_DATA_LENGTH_TOO_LONG);
2174 goto err;
2175 }
2176 /* Clear certificate digests and validity flags */
2177 for (i = 0; i < SSL_PKEY_NUM; i++) {
2178 s->cert->pkeys[i].digest = NULL;
2179 s->cert->pkeys[i].valid_flags = 0;
2180 }
2181 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) {
2182 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2183 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2184 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2185 goto err;
2186 }
2187 if (!tls1_process_sigalgs(s)) {
2188 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2189 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2190 goto err;
2191 }
2192 p += llen;
2193 }
2194
2195 /* get the CA RDNs */
2196 n2s(p, llen);
2197
2198 if ((unsigned long)(p - d + llen) != n) {
2199 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2200 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
2201 goto err;
2202 }
2203
2204 for (nc = 0; nc < llen;) {
2205 n2s(p, l);
2206 if ((l + nc + 2) > llen) {
2207 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2208 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
2209 goto err;
2210 }
2211
2212 q = p;
2213
2214 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
2215 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2216 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
2217 goto err;
2218 }
2219
2220 if (q != (p + l)) {
2221 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2222 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2223 SSL_R_CA_DN_LENGTH_MISMATCH);
2224 goto err;
2225 }
2226 if (!sk_X509_NAME_push(ca_sk, xn)) {
2227 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2228 goto err;
2229 }
2230
2231 p += l;
2232 nc += l + 2;
2233 }
2234
2235 /* we should setup a certificate to return.... */
2236 s->s3->tmp.cert_req = 1;
2237 s->s3->tmp.ctype_num = ctype_num;
2238 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
2239 s->s3->tmp.ca_names = ca_sk;
2240 ca_sk = NULL;
2241
2242 ret = 1;
2243 goto done;
2244 err:
2245 s->state = SSL_ST_ERR;
2246 done:
2247 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
2248 return (ret);
2249 }
2250
2251 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
2252 {
2253 return (X509_NAME_cmp(*a, *b));
2254 }
2255
2256 #ifndef OPENSSL_NO_TLSEXT
2257 int ssl3_get_new_session_ticket(SSL *s)
2258 {
2259 int ok, al, ret = 0, ticklen;
2260 long n;
2261 const unsigned char *p;
2262 unsigned char *d;
2263
2264 n = s->method->ssl_get_message(s,
2265 SSL3_ST_CR_SESSION_TICKET_A,
2266 SSL3_ST_CR_SESSION_TICKET_B,
2267 SSL3_MT_NEWSESSION_TICKET, 16384, &ok);
2268
2269 if (!ok)
2270 return ((int)n);
2271
2272 if (n < 6) {
2273 /* need at least ticket_lifetime_hint + ticket length */
2274 al = SSL_AD_DECODE_ERROR;
2275 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2276 goto f_err;
2277 }
2278
2279 p = d = (unsigned char *)s->init_msg;
2280 n2l(p, s->session->tlsext_tick_lifetime_hint);
2281 n2s(p, ticklen);
2282 /* ticket_lifetime_hint + ticket_length + ticket */
2283 if (ticklen + 6 != n) {
2284 al = SSL_AD_DECODE_ERROR;
2285 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2286 goto f_err;
2287 }
2288 OPENSSL_free(s->session->tlsext_tick);
2289 s->session->tlsext_ticklen = 0;
2290 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2291 if (!s->session->tlsext_tick) {
2292 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2293 goto err;
2294 }
2295 memcpy(s->session->tlsext_tick, p, ticklen);
2296 s->session->tlsext_ticklen = ticklen;
2297 /*
2298 * There are two ways to detect a resumed ticket session. One is to set
2299 * an appropriate session ID and then the server must return a match in
2300 * ServerHello. This allows the normal client session ID matching to work
2301 * and we know much earlier that the ticket has been accepted. The
2302 * other way is to set zero length session ID when the ticket is
2303 * presented and rely on the handshake to determine session resumption.
2304 * We choose the former approach because this fits in with assumptions
2305 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
2306 * SHA256 is disabled) hash of the ticket.
2307 */
2308 EVP_Digest(p, ticklen,
2309 s->session->session_id, &s->session->session_id_length,
2310 EVP_sha256(), NULL);
2311 ret = 1;
2312 return (ret);
2313 f_err:
2314 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2315 err:
2316 s->state = SSL_ST_ERR;
2317 return (-1);
2318 }
2319
2320 int ssl3_get_cert_status(SSL *s)
2321 {
2322 int ok, al;
2323 unsigned long resplen, n;
2324 const unsigned char *p;
2325
2326 n = s->method->ssl_get_message(s,
2327 SSL3_ST_CR_CERT_STATUS_A,
2328 SSL3_ST_CR_CERT_STATUS_B,
2329 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
2330
2331 if (!ok)
2332 return ((int)n);
2333 if (n < 4) {
2334 /* need at least status type + length */
2335 al = SSL_AD_DECODE_ERROR;
2336 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2337 goto f_err;
2338 }
2339 p = (unsigned char *)s->init_msg;
2340 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
2341 al = SSL_AD_DECODE_ERROR;
2342 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
2343 goto f_err;
2344 }
2345 n2l3(p, resplen);
2346 if (resplen + 4 != n) {
2347 al = SSL_AD_DECODE_ERROR;
2348 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2349 goto f_err;
2350 }
2351 OPENSSL_free(s->tlsext_ocsp_resp);
2352 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2353 if (!s->tlsext_ocsp_resp) {
2354 al = SSL_AD_INTERNAL_ERROR;
2355 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2356 goto f_err;
2357 }
2358 s->tlsext_ocsp_resplen = resplen;
2359 if (s->ctx->tlsext_status_cb) {
2360 int ret;
2361 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2362 if (ret == 0) {
2363 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2364 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
2365 goto f_err;
2366 }
2367 if (ret < 0) {
2368 al = SSL_AD_INTERNAL_ERROR;
2369 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2370 goto f_err;
2371 }
2372 }
2373 return 1;
2374 f_err:
2375 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2376 s->state = SSL_ST_ERR;
2377 return (-1);
2378 }
2379 #endif
2380
2381 int ssl3_get_server_done(SSL *s)
2382 {
2383 int ok, ret = 0;
2384 long n;
2385
2386 /* Second to last param should be very small, like 0 :-) */
2387 n = s->method->ssl_get_message(s,
2388 SSL3_ST_CR_SRVR_DONE_A,
2389 SSL3_ST_CR_SRVR_DONE_B,
2390 SSL3_MT_SERVER_DONE, 30, &ok);
2391
2392 if (!ok)
2393 return ((int)n);
2394 if (n > 0) {
2395 /* should contain no data */
2396 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2397 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
2398 s->state = SSL_ST_ERR;
2399 return -1;
2400 }
2401 ret = 1;
2402 return (ret);
2403 }
2404
2405 int ssl3_send_client_key_exchange(SSL *s)
2406 {
2407 unsigned char *p;
2408 int n;
2409 unsigned long alg_k;
2410 #ifndef OPENSSL_NO_RSA
2411 unsigned char *q;
2412 EVP_PKEY *pkey = NULL;
2413 #endif
2414 #ifndef OPENSSL_NO_EC
2415 EC_KEY *clnt_ecdh = NULL;
2416 const EC_POINT *srvr_ecpoint = NULL;
2417 EVP_PKEY *srvr_pub_pkey = NULL;
2418 unsigned char *encodedPoint = NULL;
2419 int encoded_pt_len = 0;
2420 BN_CTX *bn_ctx = NULL;
2421 #endif
2422 unsigned char *pms = NULL;
2423 size_t pmslen = 0;
2424
2425 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
2426 p = ssl_handshake_start(s);
2427
2428 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2429
2430 /* Fool emacs indentation */
2431 if (0) {
2432 }
2433 #ifndef OPENSSL_NO_RSA
2434 else if (alg_k & SSL_kRSA) {
2435 RSA *rsa;
2436 pmslen = SSL_MAX_MASTER_KEY_LENGTH;
2437 pms = OPENSSL_malloc(pmslen);
2438 if (!pms)
2439 goto memerr;
2440
2441 if (s->session->sess_cert == NULL) {
2442 /*
2443 * We should always have a server certificate with SSL_kRSA.
2444 */
2445 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2446 ERR_R_INTERNAL_ERROR);
2447 goto err;
2448 }
2449
2450 if (s->session->sess_cert->peer_rsa_tmp != NULL)
2451 rsa = s->session->sess_cert->peer_rsa_tmp;
2452 else {
2453 pkey =
2454 X509_get_pubkey(s->session->
2455 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
2456 x509);
2457 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
2458 || (pkey->pkey.rsa == NULL)) {
2459 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2460 ERR_R_INTERNAL_ERROR);
2461 goto err;
2462 }
2463 rsa = pkey->pkey.rsa;
2464 EVP_PKEY_free(pkey);
2465 }
2466
2467 pms[0] = s->client_version >> 8;
2468 pms[1] = s->client_version & 0xff;
2469 if (RAND_bytes(pms + 2, pmslen - 2) <= 0)
2470 goto err;
2471
2472 q = p;
2473 /* Fix buf for TLS and beyond */
2474 if (s->version > SSL3_VERSION)
2475 p += 2;
2476 n = RSA_public_encrypt(pmslen, pms, p, rsa, RSA_PKCS1_PADDING);
2477 # ifdef PKCS1_CHECK
2478 if (s->options & SSL_OP_PKCS1_CHECK_1)
2479 p[1]++;
2480 if (s->options & SSL_OP_PKCS1_CHECK_2)
2481 tmp_buf[0] = 0x70;
2482 # endif
2483 if (n <= 0) {
2484 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2485 SSL_R_BAD_RSA_ENCRYPT);
2486 goto err;
2487 }
2488
2489 /* Fix buf for TLS and beyond */
2490 if (s->version > SSL3_VERSION) {
2491 s2n(n, q);
2492 n += 2;
2493 }
2494 }
2495 #endif
2496 #ifndef OPENSSL_NO_DH
2497 else if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
2498 DH *dh_srvr, *dh_clnt;
2499 SESS_CERT *scert = s->session->sess_cert;
2500
2501 if (scert == NULL) {
2502 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2503 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2504 SSL_R_UNEXPECTED_MESSAGE);
2505 goto err;
2506 }
2507
2508 if (scert->peer_dh_tmp != NULL)
2509 dh_srvr = scert->peer_dh_tmp;
2510 else {
2511 /* we get them from the cert */
2512 int idx = scert->peer_cert_type;
2513 EVP_PKEY *spkey = NULL;
2514 dh_srvr = NULL;
2515 if (idx >= 0)
2516 spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509);
2517 if (spkey) {
2518 dh_srvr = EVP_PKEY_get1_DH(spkey);
2519 EVP_PKEY_free(spkey);
2520 }
2521 if (dh_srvr == NULL) {
2522 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2523 ERR_R_INTERNAL_ERROR);
2524 goto err;
2525 }
2526 }
2527 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
2528 /* Use client certificate key */
2529 EVP_PKEY *clkey = s->cert->key->privatekey;
2530 dh_clnt = NULL;
2531 if (clkey)
2532 dh_clnt = EVP_PKEY_get1_DH(clkey);
2533 if (dh_clnt == NULL) {
2534 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2535 ERR_R_INTERNAL_ERROR);
2536 goto err;
2537 }
2538 } else {
2539 /* generate a new random key */
2540 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2541 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2542 goto err;
2543 }
2544 if (!DH_generate_key(dh_clnt)) {
2545 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2546 DH_free(dh_clnt);
2547 goto err;
2548 }
2549 }
2550
2551 pmslen = DH_size(dh_clnt);
2552 pms = OPENSSL_malloc(pmslen);
2553 if (!pms)
2554 goto memerr;
2555
2556 /*
2557 * use the 'p' output buffer for the DH key, but make sure to
2558 * clear it out afterwards
2559 */
2560
2561 n = DH_compute_key(pms, dh_srvr->pub_key, dh_clnt);
2562 if (scert->peer_dh_tmp == NULL)
2563 DH_free(dh_srvr);
2564
2565 if (n <= 0) {
2566 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2567 DH_free(dh_clnt);
2568 goto err;
2569 }
2570 pmslen = n;
2571
2572 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2573 n = 0;
2574 else {
2575 /* send off the data */
2576 n = BN_num_bytes(dh_clnt->pub_key);
2577 s2n(n, p);
2578 BN_bn2bin(dh_clnt->pub_key, p);
2579 n += 2;
2580 }
2581
2582 DH_free(dh_clnt);
2583
2584 /* perhaps clean things up a bit EAY EAY EAY EAY */
2585 }
2586 #endif
2587
2588 #ifndef OPENSSL_NO_EC
2589 else if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe)) {
2590 const EC_GROUP *srvr_group = NULL;
2591 EC_KEY *tkey;
2592 int ecdh_clnt_cert = 0;
2593 int field_size = 0;
2594
2595 if (s->session->sess_cert == NULL) {
2596 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2597 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2598 SSL_R_UNEXPECTED_MESSAGE);
2599 goto err;
2600 }
2601
2602 /*
2603 * Did we send out the client's ECDH share for use in premaster
2604 * computation as part of client certificate? If so, set
2605 * ecdh_clnt_cert to 1.
2606 */
2607 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
2608 /*-
2609 * XXX: For now, we do not support client
2610 * authentication using ECDH certificates.
2611 * To add such support, one needs to add
2612 * code that checks for appropriate
2613 * conditions and sets ecdh_clnt_cert to 1.
2614 * For example, the cert have an ECC
2615 * key on the same curve as the server's
2616 * and the key should be authorized for
2617 * key agreement.
2618 *
2619 * One also needs to add code in ssl3_connect
2620 * to skip sending the certificate verify
2621 * message.
2622 *
2623 * if ((s->cert->key->privatekey != NULL) &&
2624 * (s->cert->key->privatekey->type ==
2625 * EVP_PKEY_EC) && ...)
2626 * ecdh_clnt_cert = 1;
2627 */
2628 }
2629
2630 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2631 tkey = s->session->sess_cert->peer_ecdh_tmp;
2632 } else {
2633 /* Get the Server Public Key from Cert */
2634 srvr_pub_pkey =
2635 X509_get_pubkey(s->session->
2636 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2637 if ((srvr_pub_pkey == NULL)
2638 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2639 || (srvr_pub_pkey->pkey.ec == NULL)) {
2640 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2641 ERR_R_INTERNAL_ERROR);
2642 goto err;
2643 }
2644
2645 tkey = srvr_pub_pkey->pkey.ec;
2646 }
2647
2648 srvr_group = EC_KEY_get0_group(tkey);
2649 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2650
2651 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2652 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2653 ERR_R_INTERNAL_ERROR);
2654 goto err;
2655 }
2656
2657 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2658 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2659 ERR_R_MALLOC_FAILURE);
2660 goto err;
2661 }
2662
2663 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2664 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2665 goto err;
2666 }
2667 if (ecdh_clnt_cert) {
2668 /*
2669 * Reuse key info from our certificate We only need our
2670 * private key to perform the ECDH computation.
2671 */
2672 const BIGNUM *priv_key;
2673 tkey = s->cert->key->privatekey->pkey.ec;
2674 priv_key = EC_KEY_get0_private_key(tkey);
2675 if (priv_key == NULL) {
2676 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2677 ERR_R_MALLOC_FAILURE);
2678 goto err;
2679 }
2680 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2681 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2682 goto err;
2683 }
2684 } else {
2685 /* Generate a new ECDH key pair */
2686 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2687 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2688 ERR_R_ECDH_LIB);
2689 goto err;
2690 }
2691 }
2692
2693 /*
2694 * use the 'p' output buffer for the ECDH key, but make sure to
2695 * clear it out afterwards
2696 */
2697
2698 field_size = EC_GROUP_get_degree(srvr_group);
2699 if (field_size <= 0) {
2700 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2701 goto err;
2702 }
2703 pmslen = (field_size + 7) / 8;
2704 pms = OPENSSL_malloc(pmslen);
2705 if (!pms)
2706 goto memerr;
2707 n = ECDH_compute_key(pms, pmslen, srvr_ecpoint, clnt_ecdh, NULL);
2708 if (n <= 0 || pmslen != (size_t)n) {
2709 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2710 goto err;
2711 }
2712
2713 if (ecdh_clnt_cert) {
2714 /* Send empty client key exch message */
2715 n = 0;
2716 } else {
2717 /*
2718 * First check the size of encoding and allocate memory
2719 * accordingly.
2720 */
2721 encoded_pt_len =
2722 EC_POINT_point2oct(srvr_group,
2723 EC_KEY_get0_public_key(clnt_ecdh),
2724 POINT_CONVERSION_UNCOMPRESSED,
2725 NULL, 0, NULL);
2726
2727 encodedPoint = (unsigned char *)
2728 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2729 bn_ctx = BN_CTX_new();
2730 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2731 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2732 ERR_R_MALLOC_FAILURE);
2733 goto err;
2734 }
2735
2736 /* Encode the public key */
2737 n = EC_POINT_point2oct(srvr_group,
2738 EC_KEY_get0_public_key(clnt_ecdh),
2739 POINT_CONVERSION_UNCOMPRESSED,
2740 encodedPoint, encoded_pt_len, bn_ctx);
2741
2742 *p = n; /* length of encoded point */
2743 /* Encoded point will be copied here */
2744 p += 1;
2745 /* copy the point */
2746 memcpy(p, encodedPoint, n);
2747 /* increment n to account for length field */
2748 n += 1;
2749 }
2750
2751 /* Free allocated memory */
2752 BN_CTX_free(bn_ctx);
2753 OPENSSL_free(encodedPoint);
2754 EC_KEY_free(clnt_ecdh);
2755 EVP_PKEY_free(srvr_pub_pkey);
2756 }
2757 #endif /* !OPENSSL_NO_EC */
2758 else if (alg_k & SSL_kGOST) {
2759 /* GOST key exchange message creation */
2760 EVP_PKEY_CTX *pkey_ctx;
2761 X509 *peer_cert;
2762 size_t msglen;
2763 unsigned int md_len;
2764 int keytype;
2765 unsigned char shared_ukm[32], tmp[256];
2766 EVP_MD_CTX *ukm_hash;
2767 EVP_PKEY *pub_key;
2768
2769 pmslen = 32;
2770 pms = OPENSSL_malloc(pmslen);
2771 if (!pms)
2772 goto memerr;
2773
2774 /*
2775 * Get server sertificate PKEY and create ctx from it
2776 */
2777 peer_cert =
2778 s->session->
2779 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509;
2780 if (!peer_cert)
2781 peer_cert =
2782 s->session->
2783 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509;
2784 if (!peer_cert) {
2785 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2786 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2787 goto err;
2788 }
2789
2790 pkey_ctx = EVP_PKEY_CTX_new(pub_key =
2791 X509_get_pubkey(peer_cert), NULL);
2792 /*
2793 * If we have send a certificate, and certificate key
2794 *
2795 * * parameters match those of server certificate, use
2796 * certificate key for key exchange
2797 */
2798
2799 /* Otherwise, generate ephemeral key pair */
2800
2801 EVP_PKEY_encrypt_init(pkey_ctx);
2802 /* Generate session key */
2803 if (RAND_bytes(pms, pmslen) <= 0) {
2804 EVP_PKEY_CTX_free(pkey_ctx);
2805 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2806 ERR_R_INTERNAL_ERROR);
2807 goto err;
2808 };
2809 /*
2810 * If we have client certificate, use its secret as peer key
2811 */
2812 if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2813 if (EVP_PKEY_derive_set_peer
2814 (pkey_ctx, s->cert->key->privatekey) <= 0) {
2815 /*
2816 * If there was an error - just ignore it. Ephemeral key
2817 * * would be used
2818 */
2819 ERR_clear_error();
2820 }
2821 }
2822 /*
2823 * Compute shared IV and store it in algorithm-specific context
2824 * data
2825 */
2826 ukm_hash = EVP_MD_CTX_create();
2827 EVP_DigestInit(ukm_hash,
2828 EVP_get_digestbynid(NID_id_GostR3411_94));
2829 EVP_DigestUpdate(ukm_hash, s->s3->client_random,
2830 SSL3_RANDOM_SIZE);
2831 EVP_DigestUpdate(ukm_hash, s->s3->server_random,
2832 SSL3_RANDOM_SIZE);
2833 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2834 EVP_MD_CTX_destroy(ukm_hash);
2835 if (EVP_PKEY_CTX_ctrl
2836 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8,
2837 shared_ukm) < 0) {
2838 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2839 SSL_R_LIBRARY_BUG);
2840 goto err;
2841 }
2842 /* Make GOST keytransport blob message */
2843 /*
2844 * Encapsulate it into sequence
2845 */
2846 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2847 msglen = 255;
2848 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) < 0) {
2849 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2850 SSL_R_LIBRARY_BUG);
2851 goto err;
2852 }
2853 if (msglen >= 0x80) {
2854 *(p++) = 0x81;
2855 *(p++) = msglen & 0xff;
2856 n = msglen + 3;
2857 } else {
2858 *(p++) = msglen & 0xff;
2859 n = msglen + 2;
2860 }
2861 memcpy(p, tmp, msglen);
2862 /* Check if pubkey from client certificate was used */
2863 if (EVP_PKEY_CTX_ctrl
2864 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) {
2865 /* Set flag "skip certificate verify" */
2866 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2867 }
2868 EVP_PKEY_CTX_free(pkey_ctx);
2869 EVP_PKEY_free(pub_key);
2870
2871 }
2872 #ifndef OPENSSL_NO_SRP
2873 else if (alg_k & SSL_kSRP) {
2874 if (s->srp_ctx.A != NULL) {
2875 /* send off the data */
2876 n = BN_num_bytes(s->srp_ctx.A);
2877 s2n(n, p);
2878 BN_bn2bin(s->srp_ctx.A, p);
2879 n += 2;
2880 } else {
2881 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2882 ERR_R_INTERNAL_ERROR);
2883 goto err;
2884 }
2885 OPENSSL_free(s->session->srp_username);
2886 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2887 if (s->session->srp_username == NULL) {
2888 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2889 ERR_R_MALLOC_FAILURE);
2890 goto err;
2891 }
2892 }
2893 #endif
2894 #ifndef OPENSSL_NO_PSK
2895 else if (alg_k & SSL_kPSK) {
2896 /*
2897 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
2898 * \0-terminated identity. The last byte is for us for simulating
2899 * strnlen.
2900 */
2901 char identity[PSK_MAX_IDENTITY_LEN + 2];
2902 size_t identity_len;
2903 unsigned char *t = NULL;
2904 unsigned int psk_len = 0;
2905 int psk_err = 1;
2906
2907 n = 0;
2908 if (s->psk_client_callback == NULL) {
2909 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2910 SSL_R_PSK_NO_CLIENT_CB);
2911 goto err;
2912 }
2913
2914 memset(identity, 0, sizeof(identity));
2915 /* Allocate maximum size buffer */
2916 pmslen = PSK_MAX_PSK_LEN * 2 + 4;
2917 pms = OPENSSL_malloc(pmslen);
2918 if (!pms)
2919 goto memerr;
2920
2921 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2922 identity, sizeof(identity) - 1,
2923 pms, pmslen);
2924 if (psk_len > PSK_MAX_PSK_LEN) {
2925 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2926 ERR_R_INTERNAL_ERROR);
2927 goto psk_err;
2928 } else if (psk_len == 0) {
2929 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2930 SSL_R_PSK_IDENTITY_NOT_FOUND);
2931 goto psk_err;
2932 }
2933 /* Change pmslen to real length */
2934 pmslen = 2 + psk_len + 2 + psk_len;
2935 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
2936 identity_len = strlen(identity);
2937 if (identity_len > PSK_MAX_IDENTITY_LEN) {
2938 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2939 ERR_R_INTERNAL_ERROR);
2940 goto psk_err;
2941 }
2942 /* create PSK pre_master_secret */
2943 t = pms;
2944 memmove(pms + psk_len + 4, pms, psk_len);
2945 s2n(psk_len, t);
2946 memset(t, 0, psk_len);
2947 t += psk_len;
2948 s2n(psk_len, t);
2949
2950 OPENSSL_free(s->session->psk_identity_hint);
2951 s->session->psk_identity_hint =
2952 BUF_strdup(s->ctx->psk_identity_hint);
2953 if (s->ctx->psk_identity_hint != NULL
2954 && s->session->psk_identity_hint == NULL) {
2955 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2956 ERR_R_MALLOC_FAILURE);
2957 goto psk_err;
2958 }
2959
2960 OPENSSL_free(s->session->psk_identity);
2961 s->session->psk_identity = BUF_strdup(identity);
2962 if (s->session->psk_identity == NULL) {
2963 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2964 ERR_R_MALLOC_FAILURE);
2965 goto psk_err;
2966 }
2967
2968 s2n(identity_len, p);
2969 memcpy(p, identity, identity_len);
2970 n = 2 + identity_len;
2971 psk_err = 0;
2972 psk_err:
2973 OPENSSL_cleanse(identity, sizeof(identity));
2974 if (psk_err != 0) {
2975 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2976 goto err;
2977 }
2978 }
2979 #endif
2980 else {
2981 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2982 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2983 goto err;
2984 }
2985
2986 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n)) {
2987 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2988 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2989 goto err;
2990 }
2991
2992 s->state = SSL3_ST_CW_KEY_EXCH_B;
2993 }
2994
2995 /* SSL3_ST_CW_KEY_EXCH_B */
2996 n = ssl_do_write(s);
2997 #ifndef OPENSSL_NO_SRP
2998 /* Check for SRP */
2999 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
3000 /*
3001 * If everything written generate master key: no need to save PMS as
3002 * SRP_generate_client_master_secret generates it internally.
3003 */
3004 if (n > 0) {
3005 if ((s->session->master_key_length =
3006 SRP_generate_client_master_secret(s,
3007 s->session->master_key)) <
3008 0) {
3009 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3010 ERR_R_INTERNAL_ERROR);
3011 goto err;
3012 }
3013 }
3014 } else
3015 #endif
3016 /* If we haven't written everything save PMS */
3017 if (n <= 0) {
3018 s->cert->pms = pms;
3019 s->cert->pmslen = pmslen;
3020 } else {
3021 /* If we don't have a PMS restore */
3022 if (pms == NULL) {
3023 pms = s->cert->pms;
3024 pmslen = s->cert->pmslen;
3025 }
3026 if (pms == NULL) {
3027 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3028 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
3029 goto err;
3030 }
3031 s->session->master_key_length =
3032 s->method->ssl3_enc->generate_master_secret(s,
3033 s->
3034 session->master_key,
3035 pms, pmslen);
3036 OPENSSL_clear_free(pms, pmslen);
3037 s->cert->pms = NULL;
3038 if (s->session->master_key_length < 0) {
3039 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3040 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3041 goto err;
3042 }
3043 }
3044 return n;
3045 memerr:
3046 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3047 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
3048 err:
3049 OPENSSL_clear_free(pms, pmslen);
3050 s->cert->pms = NULL;
3051 #ifndef OPENSSL_NO_EC
3052 BN_CTX_free(bn_ctx);
3053 OPENSSL_free(encodedPoint);
3054 EC_KEY_free(clnt_ecdh);
3055 EVP_PKEY_free(srvr_pub_pkey);
3056 #endif
3057 s->state = SSL_ST_ERR;
3058 return (-1);
3059 }
3060
3061 int ssl3_send_client_verify(SSL *s)
3062 {
3063 unsigned char *p;
3064 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
3065 EVP_PKEY *pkey;
3066 EVP_PKEY_CTX *pctx = NULL;
3067 EVP_MD_CTX mctx;
3068 unsigned u = 0;
3069 unsigned long n;
3070 int j;
3071
3072 EVP_MD_CTX_init(&mctx);
3073
3074 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
3075 p = ssl_handshake_start(s);
3076 pkey = s->cert->key->privatekey;
3077 /* Create context from key and test if sha1 is allowed as digest */
3078 pctx = EVP_PKEY_CTX_new(pkey, NULL);
3079 EVP_PKEY_sign_init(pctx);
3080 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
3081 if (!SSL_USE_SIGALGS(s))
3082 s->method->ssl3_enc->cert_verify_mac(s,
3083 NID_sha1,
3084 &(data
3085 [MD5_DIGEST_LENGTH]));
3086 } else {
3087 ERR_clear_error();
3088 }
3089 /*
3090 * For TLS v1.2 send signature algorithm and signature using agreed
3091 * digest and cached handshake records.
3092 */
3093 if (SSL_USE_SIGALGS(s)) {
3094 long hdatalen = 0;
3095 void *hdata;
3096 const EVP_MD *md = s->cert->key->digest;
3097 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3098 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) {
3099 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3100 goto err;
3101 }
3102 p += 2;
3103 #ifdef SSL_DEBUG
3104 fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3105 EVP_MD_name(md));
3106 #endif
3107 if (!EVP_SignInit_ex(&mctx, md, NULL)
3108 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3109 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
3110 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB);
3111 goto err;
3112 }
3113 s2n(u, p);
3114 n = u + 4;
3115 /*
3116 * For extended master secret we've already digested cached
3117 * records.
3118 */
3119 if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
3120 BIO_free(s->s3->handshake_buffer);
3121 s->s3->handshake_buffer = NULL;
3122 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3123 } else if (!ssl3_digest_cached_records(s))
3124 goto err;
3125 } else
3126 #ifndef OPENSSL_NO_RSA
3127 if (pkey->type == EVP_PKEY_RSA) {
3128 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
3129 if (RSA_sign(NID_md5_sha1, data,
3130 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
3131 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
3132 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
3133 goto err;
3134 }
3135 s2n(u, p);
3136 n = u + 2;
3137 } else
3138 #endif
3139 #ifndef OPENSSL_NO_DSA
3140 if (pkey->type == EVP_PKEY_DSA) {
3141 if (!DSA_sign(pkey->save_type,
3142 &(data[MD5_DIGEST_LENGTH]),
3143 SHA_DIGEST_LENGTH, &(p[2]),
3144 (unsigned int *)&j, pkey->pkey.dsa)) {
3145 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
3146 goto err;
3147 }
3148 s2n(j, p);
3149 n = j + 2;
3150 } else
3151 #endif
3152 #ifndef OPENSSL_NO_EC
3153 if (pkey->type == EVP_PKEY_EC) {
3154 if (!ECDSA_sign(pkey->save_type,
3155 &(data[MD5_DIGEST_LENGTH]),
3156 SHA_DIGEST_LENGTH, &(p[2]),
3157 (unsigned int *)&j, pkey->pkey.ec)) {
3158 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
3159 goto err;
3160 }
3161 s2n(j, p);
3162 n = j + 2;
3163 } else
3164 #endif
3165 if (pkey->type == NID_id_GostR3410_94
3166 || pkey->type == NID_id_GostR3410_2001) {
3167 unsigned char signbuf[64];
3168 int i;
3169 size_t sigsize = 64;
3170 s->method->ssl3_enc->cert_verify_mac(s,
3171 NID_id_GostR3411_94, data);
3172 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3173 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3174 goto err;
3175 }
3176 for (i = 63, j = 0; i >= 0; j++, i--) {
3177 p[2 + j] = signbuf[i];
3178 }
3179 s2n(j, p);
3180 n = j + 2;
3181 } else {
3182 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3183 goto err;
3184 }
3185 if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n)) {
3186 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3187 goto err;
3188 }
3189 s->state = SSL3_ST_CW_CERT_VRFY_B;
3190 }
3191 EVP_MD_CTX_cleanup(&mctx);
3192 EVP_PKEY_CTX_free(pctx);
3193 return ssl_do_write(s);
3194 err:
3195 EVP_MD_CTX_cleanup(&mctx);
3196 EVP_PKEY_CTX_free(pctx);
3197 s->state = SSL_ST_ERR;
3198 return (-1);
3199 }
3200
3201 /*
3202 * Check a certificate can be used for client authentication. Currently check
3203 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
3204 * certificates can be used and optionally checks suitability for Suite B.
3205 */
3206 static int ssl3_check_client_certificate(SSL *s)
3207 {
3208 unsigned long alg_k;
3209 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3210 return 0;
3211 /* If no suitable signature algorithm can't use certificate */
3212 if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3213 return 0;
3214 /*
3215 * If strict mode check suitability of chain before using it. This also
3216 * adjusts suite B digest if necessary.
3217 */
3218 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3219 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3220 return 0;
3221 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3222 /* See if we can use client certificate for fixed DH */
3223 if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3224 SESS_CERT *scert = s->session->sess_cert;
3225 int i = scert->peer_cert_type;
3226 EVP_PKEY *clkey = NULL, *spkey = NULL;
3227 clkey = s->cert->key->privatekey;
3228 /* If client key not DH assume it can be used */
3229 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3230 return 1;
3231 if (i >= 0)
3232 spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3233 if (spkey) {
3234 /* Compare server and client parameters */
3235 i = EVP_PKEY_cmp_parameters(clkey, spkey);
3236 EVP_PKEY_free(spkey);
3237 if (i != 1)
3238 return 0;
3239 }
3240 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3241 }
3242 return 1;
3243 }
3244
3245 int ssl3_send_client_certificate(SSL *s)
3246 {
3247 X509 *x509 = NULL;
3248 EVP_PKEY *pkey = NULL;
3249 int i;
3250
3251 if (s->state == SSL3_ST_CW_CERT_A) {
3252 /* Let cert callback update client certificates if required */
3253 if (s->cert->cert_cb) {
3254 i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3255 if (i < 0) {
3256 s->rwstate = SSL_X509_LOOKUP;
3257 return -1;
3258 }
3259 if (i == 0) {
3260 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3261 s->state = SSL_ST_ERR;
3262 return 0;
3263 }
3264 s->rwstate = SSL_NOTHING;
3265 }
3266 if (ssl3_check_client_certificate(s))
3267 s->state = SSL3_ST_CW_CERT_C;
3268 else
3269 s->state = SSL3_ST_CW_CERT_B;
3270 }
3271
3272 /* We need to get a client cert */
3273 if (s->state == SSL3_ST_CW_CERT_B) {
3274 /*
3275 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3276 * return(-1); We then get retied later
3277 */
3278 i = 0;
3279 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3280 if (i < 0) {
3281 s->rwstate = SSL_X509_LOOKUP;
3282 return (-1);
3283 }
3284 s->rwstate = SSL_NOTHING;
3285 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3286 s->state = SSL3_ST_CW_CERT_B;
3287 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3288 i = 0;
3289 } else if (i == 1) {
3290 i = 0;
3291 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
3292 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3293 }
3294
3295 X509_free(x509);
3296 EVP_PKEY_free(pkey);
3297 if (i && !ssl3_check_client_certificate(s))
3298 i = 0;
3299 if (i == 0) {
3300 if (s->version == SSL3_VERSION) {
3301 s->s3->tmp.cert_req = 0;
3302 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3303 return (1);
3304 } else {
3305 s->s3->tmp.cert_req = 2;
3306 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s)) {
3307 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3308 s->state = SSL_ST_ERR;
3309 return 0;
3310 }
3311 }
3312 }
3313
3314 /* Ok, we have a cert */
3315 s->state = SSL3_ST_CW_CERT_C;
3316 }
3317
3318 if (s->state == SSL3_ST_CW_CERT_C) {
3319 s->state = SSL3_ST_CW_CERT_D;
3320 if (!ssl3_output_cert_chain(s,
3321 (s->s3->tmp.cert_req ==
3322 2) ? NULL : s->cert->key)) {
3323 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3324 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3325 s->state = SSL_ST_ERR;
3326 return 0;
3327 }
3328 }
3329 /* SSL3_ST_CW_CERT_D */
3330 return ssl_do_write(s);
3331 }
3332
3333 #define has_bits(i,m) (((i)&(m)) == (m))
3334
3335 int ssl3_check_cert_and_algorithm(SSL *s)
3336 {
3337 int i, idx;
3338 long alg_k, alg_a;
3339 EVP_PKEY *pkey = NULL;
3340 SESS_CERT *sc;
3341 #ifndef OPENSSL_NO_RSA
3342 RSA *rsa;
3343 #endif
3344 #ifndef OPENSSL_NO_DH
3345 DH *dh;
3346 #endif
3347
3348 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3349 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3350
3351 /* we don't have a certificate */
3352 if ((alg_a & SSL_aNULL) || (alg_k & SSL_kPSK))
3353 return (1);
3354
3355 sc = s->session->sess_cert;
3356 if (sc == NULL) {
3357 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3358 goto err;
3359 }
3360 #ifndef OPENSSL_NO_RSA
3361 rsa = s->session->sess_cert->peer_rsa_tmp;
3362 #endif
3363 #ifndef OPENSSL_NO_DH
3364 dh = s->session->sess_cert->peer_dh_tmp;
3365 #endif
3366
3367 /* This is the passed certificate */
3368
3369 idx = sc->peer_cert_type;
3370 #ifndef OPENSSL_NO_EC
3371 if (idx == SSL_PKEY_ECC) {
3372 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) {
3373 /* check failed */
3374 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
3375 goto f_err;
3376 } else {
3377 return 1;
3378 }
3379 } else if (alg_a & SSL_aECDSA) {
3380 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3381 SSL_R_MISSING_ECDSA_SIGNING_CERT);
3382 goto f_err;
3383 } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
3384 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT);
3385 goto f_err;
3386 }
3387 #endif
3388 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
3389 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
3390 EVP_PKEY_free(pkey);
3391
3392 /* Check that we have a certificate if we require one */
3393 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
3394 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3395 SSL_R_MISSING_RSA_SIGNING_CERT);
3396 goto f_err;
3397 }
3398 #ifndef OPENSSL_NO_DSA
3399 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
3400 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3401 SSL_R_MISSING_DSA_SIGNING_CERT);
3402 goto f_err;
3403 }
3404 #endif
3405 #ifndef OPENSSL_NO_RSA
3406 if ((alg_k & SSL_kRSA) &&
3407 !(has_bits(i, EVP_PK_RSA | EVP_PKT_ENC) || (rsa != NULL))) {
3408 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3409 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3410 goto f_err;
3411 }
3412 #endif
3413 #ifndef OPENSSL_NO_DH
3414 if ((alg_k & SSL_kDHE) &&
3415 !(has_bits(i, EVP_PK_DH | EVP_PKT_EXCH) || (dh != NULL))) {
3416 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_KEY);
3417 goto f_err;
3418 } else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3419 !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
3420 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3421 SSL_R_MISSING_DH_RSA_CERT);
3422 goto f_err;
3423 }
3424 # ifndef OPENSSL_NO_DSA
3425 else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3426 !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
3427 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3428 SSL_R_MISSING_DH_DSA_CERT);
3429 goto f_err;
3430 }
3431 # endif
3432 #endif
3433
3434 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i, EVP_PKT_EXP)) {
3435 #ifndef OPENSSL_NO_RSA
3436 if (alg_k & SSL_kRSA) {
3437 if (rsa == NULL
3438 || RSA_size(rsa) * 8 >
3439 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3440 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3441 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3442 goto f_err;
3443 }
3444 } else
3445 #endif
3446 #ifndef OPENSSL_NO_DH
3447 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
3448 if (dh == NULL
3449 || DH_size(dh) * 8 >
3450 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3451 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3452 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3453 goto f_err;
3454 }
3455 } else
3456 #endif
3457 {
3458 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3459 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3460 goto f_err;
3461 }
3462 }
3463 return (1);
3464 f_err:
3465 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3466 err:
3467 return (0);
3468 }
3469
3470 #ifndef OPENSSL_NO_TLSEXT
3471 /*
3472 * Normally, we can tell if the server is resuming the session from
3473 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server
3474 * message after the ServerHello to determine if the server is resuming.
3475 * Therefore, we allow EAP-FAST to peek ahead.
3476 * ssl3_check_finished returns 1 if we are resuming from an external
3477 * pre-shared secret, we have a "ticket" and the next server handshake message
3478 * is Finished; and 0 otherwise. It returns -1 upon an error.
3479 */
3480 static int ssl3_check_finished(SSL *s)
3481 {
3482 int ok = 0;
3483
3484 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb ||
3485 !s->session->tlsext_tick)
3486 return 0;
3487
3488 /* Need to permit this temporarily, in case the next message is Finished. */
3489 s->s3->flags |= SSL3_FLAGS_CCS_OK;
3490 /*
3491 * This function is called when we might get a Certificate message instead,
3492 * so permit appropriate message length.
3493 * We ignore the return value as we're only interested in the message type
3494 * and not its length.
3495 */
3496 s->method->ssl_get_message(s,
3497 SSL3_ST_CR_CERT_A,
3498 SSL3_ST_CR_CERT_B,
3499 -1, s->max_cert_list, &ok);
3500 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
3501
3502 if (!ok)
3503 return -1;
3504
3505 s->s3->tmp.reuse_message = 1;
3506
3507 if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
3508 return 1;
3509
3510 /* If we're not done, then the CCS arrived early and we should bail. */
3511 if (s->s3->change_cipher_spec) {
3512 SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY);
3513 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
3514 return -1;
3515 }
3516
3517 return 0;
3518 }
3519
3520 # ifndef OPENSSL_NO_NEXTPROTONEG
3521 int ssl3_send_next_proto(SSL *s)
3522 {
3523 unsigned int len, padding_len;
3524 unsigned char *d;
3525
3526 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) {
3527 len = s->next_proto_negotiated_len;
3528 padding_len = 32 - ((len + 2) % 32);
3529 d = (unsigned char *)s->init_buf->data;
3530 d[4] = len;
3531 memcpy(d + 5, s->next_proto_negotiated, len);
3532 d[5 + len] = padding_len;
3533 memset(d + 6 + len, 0, padding_len);
3534 *(d++) = SSL3_MT_NEXT_PROTO;
3535 l2n3(2 + len + padding_len, d);
3536 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3537 s->init_num = 4 + 2 + len + padding_len;
3538 s->init_off = 0;
3539 }
3540
3541 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3542 }
3543 # endif
3544 #endif
3545
3546 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3547 {
3548 int i = 0;
3549 #ifndef OPENSSL_NO_ENGINE
3550 if (s->ctx->client_cert_engine) {
3551 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3552 SSL_get_client_CA_list(s),
3553 px509, ppkey, NULL, NULL, NULL);
3554 if (i != 0)
3555 return i;
3556 }
3557 #endif
3558 if (s->ctx->client_cert_cb)
3559 i = s->ctx->client_cert_cb(s, px509, ppkey);
3560 return i;
3561 }
3562
3563 int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
3564 unsigned char *p,
3565 int (*put_cb) (const SSL_CIPHER *,
3566 unsigned char *))
3567 {
3568 int i, j = 0;
3569 SSL_CIPHER *c;
3570 unsigned char *q;
3571 int empty_reneg_info_scsv = !s->renegotiate;
3572 /* Set disabled masks for this session */
3573 ssl_set_client_disabled(s);
3574
3575 if (sk == NULL)
3576 return (0);
3577 q = p;
3578 if (put_cb == NULL)
3579 put_cb = s->method->put_cipher_by_char;
3580
3581 for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
3582 c = sk_SSL_CIPHER_value(sk, i);
3583 /* Skip disabled ciphers */
3584 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED))
3585 continue;
3586 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
3587 if (c->id == SSL3_CK_SCSV) {
3588 if (!empty_reneg_info_scsv)
3589 continue;
3590 else
3591 empty_reneg_info_scsv = 0;
3592 }
3593 #endif
3594 j = put_cb(c, p);
3595 p += j;
3596 }
3597 /*
3598 * If p == q, no ciphers; caller indicates an error. Otherwise, add
3599 * applicable SCSVs.
3600 */
3601 if (p != q) {
3602 if (empty_reneg_info_scsv) {
3603 static SSL_CIPHER scsv = {
3604 0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3605 };
3606 j = put_cb(&scsv, p);
3607 p += j;
3608 #ifdef OPENSSL_RI_DEBUG
3609 fprintf(stderr,
3610 "TLS_EMPTY_RENEGOTIATION_INFO_SCSV sent by client\n");
3611 #endif
3612 }
3613 if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
3614 static SSL_CIPHER scsv = {
3615 0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3616 };
3617 j = put_cb(&scsv, p);
3618 p += j;
3619 }
3620 }
3621
3622 return (p - q);
3623 }
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