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OpenSSL: update to 1.0.2a
[tomato.git] / release / src / router / openssl / ssl / s3_clnt.c
blob91053d59eab39602f3c9d743c7a03d4468baa126
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 "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 # include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 # include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 # include <openssl/engine.h>
168 #endif
169
170 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
171
172 #ifndef OPENSSL_NO_SSL3_METHOD
173 static const SSL_METHOD *ssl3_get_client_method(int ver)
174 {
175 if (ver == SSL3_VERSION)
176 return (SSLv3_client_method());
177 else
178 return (NULL);
179 }
180
181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
182 ssl_undefined_function,
183 ssl3_connect, ssl3_get_client_method)
184 #endif
185 int ssl3_connect(SSL *s)
186 {
187 BUF_MEM *buf = NULL;
188 unsigned long Time = (unsigned long)time(NULL);
189 void (*cb) (const SSL *ssl, int type, int val) = NULL;
190 int ret = -1;
191 int new_state, state, skip = 0;
192
193 RAND_add(&Time, sizeof(Time), 0);
194 ERR_clear_error();
195 clear_sys_error();
196
197 if (s->info_callback != NULL)
198 cb = s->info_callback;
199 else if (s->ctx->info_callback != NULL)
200 cb = s->ctx->info_callback;
201
202 s->in_handshake++;
203 if (!SSL_in_init(s) || SSL_in_before(s))
204 SSL_clear(s);
205
206 #ifndef OPENSSL_NO_HEARTBEATS
207 /*
208 * If we're awaiting a HeartbeatResponse, pretend we already got and
209 * don't await it anymore, because Heartbeats don't make sense during
210 * handshakes anyway.
211 */
212 if (s->tlsext_hb_pending) {
213 s->tlsext_hb_pending = 0;
214 s->tlsext_hb_seq++;
215 }
216 #endif
217
218 for (;;) {
219 state = s->state;
220
221 switch (s->state) {
222 case SSL_ST_RENEGOTIATE:
223 s->renegotiate = 1;
224 s->state = SSL_ST_CONNECT;
225 s->ctx->stats.sess_connect_renegotiate++;
226 /* break */
227 case SSL_ST_BEFORE:
228 case SSL_ST_CONNECT:
229 case SSL_ST_BEFORE | SSL_ST_CONNECT:
230 case SSL_ST_OK | SSL_ST_CONNECT:
231
232 s->server = 0;
233 if (cb != NULL)
234 cb(s, SSL_CB_HANDSHAKE_START, 1);
235
236 if ((s->version & 0xff00) != 0x0300) {
237 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
238 ret = -1;
239 goto end;
240 }
241
242 /* s->version=SSL3_VERSION; */
243 s->type = SSL_ST_CONNECT;
244
245 if (s->init_buf == NULL) {
246 if ((buf = BUF_MEM_new()) == NULL) {
247 ret = -1;
248 goto end;
249 }
250 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
251 ret = -1;
252 goto end;
253 }
254 s->init_buf = buf;
255 buf = NULL;
256 }
257
258 if (!ssl3_setup_buffers(s)) {
259 ret = -1;
260 goto end;
261 }
262
263 /* setup buffing BIO */
264 if (!ssl_init_wbio_buffer(s, 0)) {
265 ret = -1;
266 goto end;
267 }
268
269 /* don't push the buffering BIO quite yet */
270
271 ssl3_init_finished_mac(s);
272
273 s->state = SSL3_ST_CW_CLNT_HELLO_A;
274 s->ctx->stats.sess_connect++;
275 s->init_num = 0;
276 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
277 /*
278 * Should have been reset by ssl3_get_finished, too.
279 */
280 s->s3->change_cipher_spec = 0;
281 break;
282
283 case SSL3_ST_CW_CLNT_HELLO_A:
284 case SSL3_ST_CW_CLNT_HELLO_B:
285
286 s->shutdown = 0;
287 ret = ssl3_client_hello(s);
288 if (ret <= 0)
289 goto end;
290 s->state = SSL3_ST_CR_SRVR_HELLO_A;
291 s->init_num = 0;
292
293 /* turn on buffering for the next lot of output */
294 if (s->bbio != s->wbio)
295 s->wbio = BIO_push(s->bbio, s->wbio);
296
297 break;
298
299 case SSL3_ST_CR_SRVR_HELLO_A:
300 case SSL3_ST_CR_SRVR_HELLO_B:
301 ret = ssl3_get_server_hello(s);
302 if (ret <= 0)
303 goto end;
304
305 if (s->hit) {
306 s->state = SSL3_ST_CR_FINISHED_A;
307 #ifndef OPENSSL_NO_TLSEXT
308 if (s->tlsext_ticket_expected) {
309 /* receive renewed session ticket */
310 s->state = SSL3_ST_CR_SESSION_TICKET_A;
311 }
312 #endif
313 } else {
314 s->state = SSL3_ST_CR_CERT_A;
315 }
316 s->init_num = 0;
317 break;
318 case SSL3_ST_CR_CERT_A:
319 case SSL3_ST_CR_CERT_B:
320 /* Check if it is anon DH/ECDH, SRP auth */
321 /* or PSK */
322 if (!
323 (s->s3->tmp.
324 new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
325 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
326 ret = ssl3_get_server_certificate(s);
327 if (ret <= 0)
328 goto end;
329 #ifndef OPENSSL_NO_TLSEXT
330 if (s->tlsext_status_expected)
331 s->state = SSL3_ST_CR_CERT_STATUS_A;
332 else
333 s->state = SSL3_ST_CR_KEY_EXCH_A;
334 } else {
335 skip = 1;
336 s->state = SSL3_ST_CR_KEY_EXCH_A;
337 }
338 #else
339 } else
340 skip = 1;
341
342 s->state = SSL3_ST_CR_KEY_EXCH_A;
343 #endif
344 s->init_num = 0;
345 break;
346
347 case SSL3_ST_CR_KEY_EXCH_A:
348 case SSL3_ST_CR_KEY_EXCH_B:
349 ret = ssl3_get_key_exchange(s);
350 if (ret <= 0)
351 goto end;
352 s->state = SSL3_ST_CR_CERT_REQ_A;
353 s->init_num = 0;
354
355 /*
356 * at this point we check that we have the required stuff from
357 * the server
358 */
359 if (!ssl3_check_cert_and_algorithm(s)) {
360 ret = -1;
361 goto end;
362 }
363 break;
364
365 case SSL3_ST_CR_CERT_REQ_A:
366 case SSL3_ST_CR_CERT_REQ_B:
367 ret = ssl3_get_certificate_request(s);
368 if (ret <= 0)
369 goto end;
370 s->state = SSL3_ST_CR_SRVR_DONE_A;
371 s->init_num = 0;
372 break;
373
374 case SSL3_ST_CR_SRVR_DONE_A:
375 case SSL3_ST_CR_SRVR_DONE_B:
376 ret = ssl3_get_server_done(s);
377 if (ret <= 0)
378 goto end;
379 #ifndef OPENSSL_NO_SRP
380 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
381 if ((ret = SRP_Calc_A_param(s)) <= 0) {
382 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC);
383 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
384 goto end;
385 }
386 }
387 #endif
388 if (s->s3->tmp.cert_req)
389 s->state = SSL3_ST_CW_CERT_A;
390 else
391 s->state = SSL3_ST_CW_KEY_EXCH_A;
392 s->init_num = 0;
393
394 break;
395
396 case SSL3_ST_CW_CERT_A:
397 case SSL3_ST_CW_CERT_B:
398 case SSL3_ST_CW_CERT_C:
399 case SSL3_ST_CW_CERT_D:
400 ret = ssl3_send_client_certificate(s);
401 if (ret <= 0)
402 goto end;
403 s->state = SSL3_ST_CW_KEY_EXCH_A;
404 s->init_num = 0;
405 break;
406
407 case SSL3_ST_CW_KEY_EXCH_A:
408 case SSL3_ST_CW_KEY_EXCH_B:
409 ret = ssl3_send_client_key_exchange(s);
410 if (ret <= 0)
411 goto end;
412 /*
413 * EAY EAY EAY need to check for DH fix cert sent back
414 */
415 /*
416 * For TLS, cert_req is set to 2, so a cert chain of nothing is
417 * sent, but no verify packet is sent
418 */
419 /*
420 * XXX: For now, we do not support client authentication in ECDH
421 * cipher suites with ECDH (rather than ECDSA) certificates. We
422 * need to skip the certificate verify message when client's
423 * ECDH public key is sent inside the client certificate.
424 */
425 if (s->s3->tmp.cert_req == 1) {
426 s->state = SSL3_ST_CW_CERT_VRFY_A;
427 } else {
428 s->state = SSL3_ST_CW_CHANGE_A;
429 }
430 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
431 s->state = SSL3_ST_CW_CHANGE_A;
432 }
433
434 s->init_num = 0;
435 break;
436
437 case SSL3_ST_CW_CERT_VRFY_A:
438 case SSL3_ST_CW_CERT_VRFY_B:
439 ret = ssl3_send_client_verify(s);
440 if (ret <= 0)
441 goto end;
442 s->state = SSL3_ST_CW_CHANGE_A;
443 s->init_num = 0;
444 break;
445
446 case SSL3_ST_CW_CHANGE_A:
447 case SSL3_ST_CW_CHANGE_B:
448 ret = ssl3_send_change_cipher_spec(s,
449 SSL3_ST_CW_CHANGE_A,
450 SSL3_ST_CW_CHANGE_B);
451 if (ret <= 0)
452 goto end;
453
454 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
455 s->state = SSL3_ST_CW_FINISHED_A;
456 #else
457 if (s->s3->next_proto_neg_seen)
458 s->state = SSL3_ST_CW_NEXT_PROTO_A;
459 else
460 s->state = SSL3_ST_CW_FINISHED_A;
461 #endif
462 s->init_num = 0;
463
464 s->session->cipher = s->s3->tmp.new_cipher;
465 #ifdef OPENSSL_NO_COMP
466 s->session->compress_meth = 0;
467 #else
468 if (s->s3->tmp.new_compression == NULL)
469 s->session->compress_meth = 0;
470 else
471 s->session->compress_meth = s->s3->tmp.new_compression->id;
472 #endif
473 if (!s->method->ssl3_enc->setup_key_block(s)) {
474 ret = -1;
475 goto end;
476 }
477
478 if (!s->method->ssl3_enc->change_cipher_state(s,
479 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
480 {
481 ret = -1;
482 goto end;
483 }
484
485 break;
486
487 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
488 case SSL3_ST_CW_NEXT_PROTO_A:
489 case SSL3_ST_CW_NEXT_PROTO_B:
490 ret = ssl3_send_next_proto(s);
491 if (ret <= 0)
492 goto end;
493 s->state = SSL3_ST_CW_FINISHED_A;
494 break;
495 #endif
496
497 case SSL3_ST_CW_FINISHED_A:
498 case SSL3_ST_CW_FINISHED_B:
499 ret = ssl3_send_finished(s,
500 SSL3_ST_CW_FINISHED_A,
501 SSL3_ST_CW_FINISHED_B,
502 s->method->
503 ssl3_enc->client_finished_label,
504 s->method->
505 ssl3_enc->client_finished_label_len);
506 if (ret <= 0)
507 goto end;
508 s->state = SSL3_ST_CW_FLUSH;
509
510 /* clear flags */
511 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
512 if (s->hit) {
513 s->s3->tmp.next_state = SSL_ST_OK;
514 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
515 s->state = SSL_ST_OK;
516 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
517 s->s3->delay_buf_pop_ret = 0;
518 }
519 } else {
520 #ifndef OPENSSL_NO_TLSEXT
521 /*
522 * Allow NewSessionTicket if ticket expected
523 */
524 if (s->tlsext_ticket_expected)
525 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
526 else
527 #endif
528
529 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
530 }
531 s->init_num = 0;
532 break;
533
534 #ifndef OPENSSL_NO_TLSEXT
535 case SSL3_ST_CR_SESSION_TICKET_A:
536 case SSL3_ST_CR_SESSION_TICKET_B:
537 ret = ssl3_get_new_session_ticket(s);
538 if (ret <= 0)
539 goto end;
540 s->state = SSL3_ST_CR_FINISHED_A;
541 s->init_num = 0;
542 break;
543
544 case SSL3_ST_CR_CERT_STATUS_A:
545 case SSL3_ST_CR_CERT_STATUS_B:
546 ret = ssl3_get_cert_status(s);
547 if (ret <= 0)
548 goto end;
549 s->state = SSL3_ST_CR_KEY_EXCH_A;
550 s->init_num = 0;
551 break;
552 #endif
553
554 case SSL3_ST_CR_FINISHED_A:
555 case SSL3_ST_CR_FINISHED_B:
556 s->s3->flags |= SSL3_FLAGS_CCS_OK;
557 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
558 SSL3_ST_CR_FINISHED_B);
559 if (ret <= 0)
560 goto end;
561
562 if (s->hit)
563 s->state = SSL3_ST_CW_CHANGE_A;
564 else
565 s->state = SSL_ST_OK;
566 s->init_num = 0;
567 break;
568
569 case SSL3_ST_CW_FLUSH:
570 s->rwstate = SSL_WRITING;
571 if (BIO_flush(s->wbio) <= 0) {
572 ret = -1;
573 goto end;
574 }
575 s->rwstate = SSL_NOTHING;
576 s->state = s->s3->tmp.next_state;
577 break;
578
579 case SSL_ST_OK:
580 /* clean a few things up */
581 ssl3_cleanup_key_block(s);
582
583 if (s->init_buf != NULL) {
584 BUF_MEM_free(s->init_buf);
585 s->init_buf = NULL;
586 }
587
588 /*
589 * If we are not 'joining' the last two packets, remove the
590 * buffering now
591 */
592 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
593 ssl_free_wbio_buffer(s);
594 /* else do it later in ssl3_write */
595
596 s->init_num = 0;
597 s->renegotiate = 0;
598 s->new_session = 0;
599
600 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
601 if (s->hit)
602 s->ctx->stats.sess_hit++;
603
604 ret = 1;
605 /* s->server=0; */
606 s->handshake_func = ssl3_connect;
607 s->ctx->stats.sess_connect_good++;
608
609 if (cb != NULL)
610 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
611
612 goto end;
613 /* break; */
614
615 default:
616 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
617 ret = -1;
618 goto end;
619 /* break; */
620 }
621
622 /* did we do anything */
623 if (!s->s3->tmp.reuse_message && !skip) {
624 if (s->debug) {
625 if ((ret = BIO_flush(s->wbio)) <= 0)
626 goto end;
627 }
628
629 if ((cb != NULL) && (s->state != state)) {
630 new_state = s->state;
631 s->state = state;
632 cb(s, SSL_CB_CONNECT_LOOP, 1);
633 s->state = new_state;
634 }
635 }
636 skip = 0;
637 }
638 end:
639 s->in_handshake--;
640 if (buf != NULL)
641 BUF_MEM_free(buf);
642 if (cb != NULL)
643 cb(s, SSL_CB_CONNECT_EXIT, ret);
644 return (ret);
645 }
646
647 int ssl3_client_hello(SSL *s)
648 {
649 unsigned char *buf;
650 unsigned char *p, *d;
651 int i;
652 unsigned long l;
653 int al = 0;
654 #ifndef OPENSSL_NO_COMP
655 int j;
656 SSL_COMP *comp;
657 #endif
658
659 buf = (unsigned char *)s->init_buf->data;
660 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
661 SSL_SESSION *sess = s->session;
662 if ((sess == NULL) ||
663 (sess->ssl_version != s->version) ||
664 !sess->session_id_length || (sess->not_resumable)) {
665 if (!ssl_get_new_session(s, 0))
666 goto err;
667 }
668 if (s->method->version == DTLS_ANY_VERSION) {
669 /* Determine which DTLS version to use */
670 int options = s->options;
671 /* If DTLS 1.2 disabled correct the version number */
672 if (options & SSL_OP_NO_DTLSv1_2) {
673 if (tls1_suiteb(s)) {
674 SSLerr(SSL_F_SSL3_CLIENT_HELLO,
675 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
676 goto err;
677 }
678 /*
679 * Disabling all versions is silly: return an error.
680 */
681 if (options & SSL_OP_NO_DTLSv1) {
682 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_WRONG_SSL_VERSION);
683 goto err;
684 }
685 /*
686 * Update method so we don't use any DTLS 1.2 features.
687 */
688 s->method = DTLSv1_client_method();
689 s->version = DTLS1_VERSION;
690 } else {
691 /*
692 * We only support one version: update method
693 */
694 if (options & SSL_OP_NO_DTLSv1)
695 s->method = DTLSv1_2_client_method();
696 s->version = DTLS1_2_VERSION;
697 }
698 s->client_version = s->version;
699 }
700 /* else use the pre-loaded session */
701
702 p = s->s3->client_random;
703
704 /*
705 * for DTLS if client_random is initialized, reuse it, we are
706 * required to use same upon reply to HelloVerify
707 */
708 if (SSL_IS_DTLS(s)) {
709 size_t idx;
710 i = 1;
711 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
712 if (p[idx]) {
713 i = 0;
714 break;
715 }
716 }
717 } else
718 i = 1;
719
720 if (i && ssl_fill_hello_random(s, 0, p,
721 sizeof(s->s3->client_random)) <= 0)
722 goto err;
723
724 /* Do the message type and length last */
725 d = p = ssl_handshake_start(s);
726
727 /*-
728 * version indicates the negotiated version: for example from
729 * an SSLv2/v3 compatible client hello). The client_version
730 * field is the maximum version we permit and it is also
731 * used in RSA encrypted premaster secrets. Some servers can
732 * choke if we initially report a higher version then
733 * renegotiate to a lower one in the premaster secret. This
734 * didn't happen with TLS 1.0 as most servers supported it
735 * but it can with TLS 1.1 or later if the server only supports
736 * 1.0.
737 *
738 * Possible scenario with previous logic:
739 * 1. Client hello indicates TLS 1.2
740 * 2. Server hello says TLS 1.0
741 * 3. RSA encrypted premaster secret uses 1.2.
742 * 4. Handhaked proceeds using TLS 1.0.
743 * 5. Server sends hello request to renegotiate.
744 * 6. Client hello indicates TLS v1.0 as we now
745 * know that is maximum server supports.
746 * 7. Server chokes on RSA encrypted premaster secret
747 * containing version 1.0.
748 *
749 * For interoperability it should be OK to always use the
750 * maximum version we support in client hello and then rely
751 * on the checking of version to ensure the servers isn't
752 * being inconsistent: for example initially negotiating with
753 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
754 * client_version in client hello and not resetting it to
755 * the negotiated version.
756 */
757 #if 0
758 *(p++) = s->version >> 8;
759 *(p++) = s->version & 0xff;
760 s->client_version = s->version;
761 #else
762 *(p++) = s->client_version >> 8;
763 *(p++) = s->client_version & 0xff;
764 #endif
765
766 /* Random stuff */
767 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
768 p += SSL3_RANDOM_SIZE;
769
770 /* Session ID */
771 if (s->new_session)
772 i = 0;
773 else
774 i = s->session->session_id_length;
775 *(p++) = i;
776 if (i != 0) {
777 if (i > (int)sizeof(s->session->session_id)) {
778 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
779 goto err;
780 }
781 memcpy(p, s->session->session_id, i);
782 p += i;
783 }
784
785 /* cookie stuff for DTLS */
786 if (SSL_IS_DTLS(s)) {
787 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
788 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
789 goto err;
790 }
791 *(p++) = s->d1->cookie_len;
792 memcpy(p, s->d1->cookie, s->d1->cookie_len);
793 p += s->d1->cookie_len;
794 }
795
796 /* Ciphers supported */
797 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
798 if (i == 0) {
799 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
800 goto err;
801 }
802 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
803 /*
804 * Some servers hang if client hello > 256 bytes as hack workaround
805 * chop number of supported ciphers to keep it well below this if we
806 * use TLS v1.2
807 */
808 if (TLS1_get_version(s) >= TLS1_2_VERSION
809 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
810 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
811 #endif
812 s2n(i, p);
813 p += i;
814
815 /* COMPRESSION */
816 #ifdef OPENSSL_NO_COMP
817 *(p++) = 1;
818 #else
819
820 if ((s->options & SSL_OP_NO_COMPRESSION)
821 || !s->ctx->comp_methods)
822 j = 0;
823 else
824 j = sk_SSL_COMP_num(s->ctx->comp_methods);
825 *(p++) = 1 + j;
826 for (i = 0; i < j; i++) {
827 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
828 *(p++) = comp->id;
829 }
830 #endif
831 *(p++) = 0; /* Add the NULL method */
832
833 #ifndef OPENSSL_NO_TLSEXT
834 /* TLS extensions */
835 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
836 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
837 goto err;
838 }
839 if ((p =
840 ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
841 &al)) == NULL) {
842 ssl3_send_alert(s, SSL3_AL_FATAL, al);
843 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
844 goto err;
845 }
846 #endif
847
848 l = p - d;
849 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
850 s->state = SSL3_ST_CW_CLNT_HELLO_B;
851 }
852
853 /* SSL3_ST_CW_CLNT_HELLO_B */
854 return ssl_do_write(s);
855 err:
856 return (-1);
857 }
858
859 int ssl3_get_server_hello(SSL *s)
860 {
861 STACK_OF(SSL_CIPHER) *sk;
862 const SSL_CIPHER *c;
863 CERT *ct = s->cert;
864 unsigned char *p, *d;
865 int i, al = SSL_AD_INTERNAL_ERROR, ok;
866 unsigned int j;
867 long n;
868 #ifndef OPENSSL_NO_COMP
869 SSL_COMP *comp;
870 #endif
871 /*
872 * Hello verify request and/or server hello version may not match so set
873 * first packet if we're negotiating version.
874 */
875 if (SSL_IS_DTLS(s))
876 s->first_packet = 1;
877
878 n = s->method->ssl_get_message(s,
879 SSL3_ST_CR_SRVR_HELLO_A,
880 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
881
882 if (!ok)
883 return ((int)n);
884
885 if (SSL_IS_DTLS(s)) {
886 s->first_packet = 0;
887 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
888 if (s->d1->send_cookie == 0) {
889 s->s3->tmp.reuse_message = 1;
890 return 1;
891 } else { /* already sent a cookie */
892
893 al = SSL_AD_UNEXPECTED_MESSAGE;
894 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
895 goto f_err;
896 }
897 }
898 }
899
900 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
901 al = SSL_AD_UNEXPECTED_MESSAGE;
902 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
903 goto f_err;
904 }
905
906 d = p = (unsigned char *)s->init_msg;
907 if (s->method->version == DTLS_ANY_VERSION) {
908 /* Work out correct protocol version to use */
909 int hversion = (p[0] << 8) | p[1];
910 int options = s->options;
911 if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2))
912 s->method = DTLSv1_2_client_method();
913 else if (tls1_suiteb(s)) {
914 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
915 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
916 s->version = hversion;
917 al = SSL_AD_PROTOCOL_VERSION;
918 goto f_err;
919 } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1))
920 s->method = DTLSv1_client_method();
921 else {
922 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
923 s->version = hversion;
924 al = SSL_AD_PROTOCOL_VERSION;
925 goto f_err;
926 }
927 s->version = s->method->version;
928 }
929
930 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
931 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
932 s->version = (s->version & 0xff00) | p[1];
933 al = SSL_AD_PROTOCOL_VERSION;
934 goto f_err;
935 }
936 p += 2;
937
938 /* load the server hello data */
939 /* load the server random */
940 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
941 p += SSL3_RANDOM_SIZE;
942
943 s->hit = 0;
944
945 /* get the session-id */
946 j = *(p++);
947
948 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
949 al = SSL_AD_ILLEGAL_PARAMETER;
950 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
951 goto f_err;
952 }
953 #ifndef OPENSSL_NO_TLSEXT
954 /*
955 * check if we want to resume the session based on external pre-shared
956 * secret
957 */
958 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
959 SSL_CIPHER *pref_cipher = NULL;
960 s->session->master_key_length = sizeof(s->session->master_key);
961 if (s->tls_session_secret_cb(s, s->session->master_key,
962 &s->session->master_key_length,
963 NULL, &pref_cipher,
964 s->tls_session_secret_cb_arg)) {
965 s->session->cipher = pref_cipher ?
966 pref_cipher : ssl_get_cipher_by_char(s, p + j);
967 s->hit = 1;
968 }
969 }
970 #endif /* OPENSSL_NO_TLSEXT */
971
972 if (!s->hit && j != 0 && j == s->session->session_id_length
973 && memcmp(p, s->session->session_id, j) == 0) {
974 if (s->sid_ctx_length != s->session->sid_ctx_length
975 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
976 /* actually a client application bug */
977 al = SSL_AD_ILLEGAL_PARAMETER;
978 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
979 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
980 goto f_err;
981 }
982 s->hit = 1;
983 }
984 /* a miss or crap from the other end */
985 if (!s->hit) {
986 /*
987 * If we were trying for session-id reuse, make a new SSL_SESSION so
988 * we don't stuff up other people
989 */
990 if (s->session->session_id_length > 0) {
991 if (!ssl_get_new_session(s, 0)) {
992 goto f_err;
993 }
994 }
995 s->session->session_id_length = j;
996 memcpy(s->session->session_id, p, j); /* j could be 0 */
997 }
998 p += j;
999 c = ssl_get_cipher_by_char(s, p);
1000 if (c == NULL) {
1001 /* unknown cipher */
1002 al = SSL_AD_ILLEGAL_PARAMETER;
1003 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
1004 goto f_err;
1005 }
1006 /*
1007 * If it is a disabled cipher we didn't send it in client hello, so
1008 * return an error.
1009 */
1010 if (c->algorithm_ssl & ct->mask_ssl ||
1011 c->algorithm_mkey & ct->mask_k || c->algorithm_auth & ct->mask_a) {
1012 al = SSL_AD_ILLEGAL_PARAMETER;
1013 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1014 goto f_err;
1015 }
1016 p += ssl_put_cipher_by_char(s, NULL, NULL);
1017
1018 sk = ssl_get_ciphers_by_id(s);
1019 i = sk_SSL_CIPHER_find(sk, c);
1020 if (i < 0) {
1021 /* we did not say we would use this cipher */
1022 al = SSL_AD_ILLEGAL_PARAMETER;
1023 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1024 goto f_err;
1025 }
1026
1027 /*
1028 * Depending on the session caching (internal/external), the cipher
1029 * and/or cipher_id values may not be set. Make sure that cipher_id is
1030 * set and use it for comparison.
1031 */
1032 if (s->session->cipher)
1033 s->session->cipher_id = s->session->cipher->id;
1034 if (s->hit && (s->session->cipher_id != c->id)) {
1035 /* Workaround is now obsolete */
1036 #if 0
1037 if (!(s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1038 #endif
1039 {
1040 al = SSL_AD_ILLEGAL_PARAMETER;
1041 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1042 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1043 goto f_err;
1044 }
1045 }
1046 s->s3->tmp.new_cipher = c;
1047 /*
1048 * Don't digest cached records if no sigalgs: we may need them for client
1049 * authentication.
1050 */
1051 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1052 goto f_err;
1053 /* lets get the compression algorithm */
1054 /* COMPRESSION */
1055 #ifdef OPENSSL_NO_COMP
1056 if (*(p++) != 0) {
1057 al = SSL_AD_ILLEGAL_PARAMETER;
1058 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1059 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1060 goto f_err;
1061 }
1062 /*
1063 * If compression is disabled we'd better not try to resume a session
1064 * using compression.
1065 */
1066 if (s->session->compress_meth != 0) {
1067 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1068 goto f_err;
1069 }
1070 #else
1071 j = *(p++);
1072 if (s->hit && j != s->session->compress_meth) {
1073 al = SSL_AD_ILLEGAL_PARAMETER;
1074 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1075 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1076 goto f_err;
1077 }
1078 if (j == 0)
1079 comp = NULL;
1080 else if (s->options & SSL_OP_NO_COMPRESSION) {
1081 al = SSL_AD_ILLEGAL_PARAMETER;
1082 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
1083 goto f_err;
1084 } else
1085 comp = ssl3_comp_find(s->ctx->comp_methods, j);
1086
1087 if ((j != 0) && (comp == NULL)) {
1088 al = SSL_AD_ILLEGAL_PARAMETER;
1089 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1090 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1091 goto f_err;
1092 } else {
1093 s->s3->tmp.new_compression = comp;
1094 }
1095 #endif
1096
1097 #ifndef OPENSSL_NO_TLSEXT
1098 /* TLS extensions */
1099 if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) {
1100 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
1101 goto err;
1102 }
1103 #endif
1104
1105 if (p != (d + n)) {
1106 /* wrong packet length */
1107 al = SSL_AD_DECODE_ERROR;
1108 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
1109 goto f_err;
1110 }
1111
1112 return (1);
1113 f_err:
1114 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1115 err:
1116 return (-1);
1117 }
1118
1119 int ssl3_get_server_certificate(SSL *s)
1120 {
1121 int al, i, ok, ret = -1;
1122 unsigned long n, nc, llen, l;
1123 X509 *x = NULL;
1124 const unsigned char *q, *p;
1125 unsigned char *d;
1126 STACK_OF(X509) *sk = NULL;
1127 SESS_CERT *sc;
1128 EVP_PKEY *pkey = NULL;
1129 int need_cert = 1; /* VRS: 0=> will allow null cert if auth ==
1130 * KRB5 */
1131
1132 n = s->method->ssl_get_message(s,
1133 SSL3_ST_CR_CERT_A,
1134 SSL3_ST_CR_CERT_B,
1135 -1, s->max_cert_list, &ok);
1136
1137 if (!ok)
1138 return ((int)n);
1139
1140 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1141 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1142 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) {
1143 s->s3->tmp.reuse_message = 1;
1144 return (1);
1145 }
1146
1147 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1148 al = SSL_AD_UNEXPECTED_MESSAGE;
1149 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
1150 goto f_err;
1151 }
1152 p = d = (unsigned char *)s->init_msg;
1153
1154 if ((sk = sk_X509_new_null()) == NULL) {
1155 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1156 goto err;
1157 }
1158
1159 n2l3(p, llen);
1160 if (llen + 3 != n) {
1161 al = SSL_AD_DECODE_ERROR;
1162 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
1163 goto f_err;
1164 }
1165 for (nc = 0; nc < llen;) {
1166 n2l3(p, l);
1167 if ((l + nc + 3) > llen) {
1168 al = SSL_AD_DECODE_ERROR;
1169 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1170 SSL_R_CERT_LENGTH_MISMATCH);
1171 goto f_err;
1172 }
1173
1174 q = p;
1175 x = d2i_X509(NULL, &q, l);
1176 if (x == NULL) {
1177 al = SSL_AD_BAD_CERTIFICATE;
1178 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
1179 goto f_err;
1180 }
1181 if (q != (p + l)) {
1182 al = SSL_AD_DECODE_ERROR;
1183 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1184 SSL_R_CERT_LENGTH_MISMATCH);
1185 goto f_err;
1186 }
1187 if (!sk_X509_push(sk, x)) {
1188 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1189 goto err;
1190 }
1191 x = NULL;
1192 nc += l + 3;
1193 p = q;
1194 }
1195
1196 i = ssl_verify_cert_chain(s, sk);
1197 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1198 #ifndef OPENSSL_NO_KRB5
1199 && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1200 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1201 #endif /* OPENSSL_NO_KRB5 */
1202 ) {
1203 al = ssl_verify_alarm_type(s->verify_result);
1204 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1205 SSL_R_CERTIFICATE_VERIFY_FAILED);
1206 goto f_err;
1207 }
1208 ERR_clear_error(); /* but we keep s->verify_result */
1209
1210 sc = ssl_sess_cert_new();
1211 if (sc == NULL)
1212 goto err;
1213
1214 if (s->session->sess_cert)
1215 ssl_sess_cert_free(s->session->sess_cert);
1216 s->session->sess_cert = sc;
1217
1218 sc->cert_chain = sk;
1219 /*
1220 * Inconsistency alert: cert_chain does include the peer's certificate,
1221 * which we don't include in s3_srvr.c
1222 */
1223 x = sk_X509_value(sk, 0);
1224 sk = NULL;
1225 /*
1226 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1227 */
1228
1229 pkey = X509_get_pubkey(x);
1230
1231 /* VRS: allow null cert if auth == KRB5 */
1232 need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1233 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1234 ? 0 : 1;
1235
1236 #ifdef KSSL_DEBUG
1237 fprintf(stderr, "pkey,x = %p, %p\n", pkey, x);
1238 fprintf(stderr, "ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey));
1239 fprintf(stderr, "cipher, alg, nc = %s, %lx, %lx, %d\n",
1240 s->s3->tmp.new_cipher->name,
1241 s->s3->tmp.new_cipher->algorithm_mkey,
1242 s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1243 #endif /* KSSL_DEBUG */
1244
1245 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) {
1246 x = NULL;
1247 al = SSL3_AL_FATAL;
1248 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1249 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1250 goto f_err;
1251 }
1252
1253 i = ssl_cert_type(x, pkey);
1254 if (need_cert && i < 0) {
1255 x = NULL;
1256 al = SSL3_AL_FATAL;
1257 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1258 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1259 goto f_err;
1260 }
1261
1262 if (need_cert) {
1263 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1264 if (exp_idx >= 0 && i != exp_idx) {
1265 x = NULL;
1266 al = SSL_AD_ILLEGAL_PARAMETER;
1267 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1268 SSL_R_WRONG_CERTIFICATE_TYPE);
1269 goto f_err;
1270 }
1271 sc->peer_cert_type = i;
1272 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1273 /*
1274 * Why would the following ever happen? We just created sc a couple
1275 * of lines ago.
1276 */
1277 if (sc->peer_pkeys[i].x509 != NULL)
1278 X509_free(sc->peer_pkeys[i].x509);
1279 sc->peer_pkeys[i].x509 = x;
1280 sc->peer_key = &(sc->peer_pkeys[i]);
1281
1282 if (s->session->peer != NULL)
1283 X509_free(s->session->peer);
1284 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1285 s->session->peer = x;
1286 } else {
1287 sc->peer_cert_type = i;
1288 sc->peer_key = NULL;
1289
1290 if (s->session->peer != NULL)
1291 X509_free(s->session->peer);
1292 s->session->peer = NULL;
1293 }
1294 s->session->verify_result = s->verify_result;
1295
1296 x = NULL;
1297 ret = 1;
1298 if (0) {
1299 f_err:
1300 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1301 }
1302 err:
1303 EVP_PKEY_free(pkey);
1304 X509_free(x);
1305 sk_X509_pop_free(sk, X509_free);
1306 return (ret);
1307 }
1308
1309 int ssl3_get_key_exchange(SSL *s)
1310 {
1311 #ifndef OPENSSL_NO_RSA
1312 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1313 #endif
1314 EVP_MD_CTX md_ctx;
1315 unsigned char *param, *p;
1316 int al, j, ok;
1317 long i, param_len, n, alg_k, alg_a;
1318 EVP_PKEY *pkey = NULL;
1319 const EVP_MD *md = NULL;
1320 #ifndef OPENSSL_NO_RSA
1321 RSA *rsa = NULL;
1322 #endif
1323 #ifndef OPENSSL_NO_DH
1324 DH *dh = NULL;
1325 #endif
1326 #ifndef OPENSSL_NO_ECDH
1327 EC_KEY *ecdh = NULL;
1328 BN_CTX *bn_ctx = NULL;
1329 EC_POINT *srvr_ecpoint = NULL;
1330 int curve_nid = 0;
1331 int encoded_pt_len = 0;
1332 #endif
1333
1334 EVP_MD_CTX_init(&md_ctx);
1335
1336 /*
1337 * use same message size as in ssl3_get_certificate_request() as
1338 * ServerKeyExchange message may be skipped
1339 */
1340 n = s->method->ssl_get_message(s,
1341 SSL3_ST_CR_KEY_EXCH_A,
1342 SSL3_ST_CR_KEY_EXCH_B,
1343 -1, s->max_cert_list, &ok);
1344 if (!ok)
1345 return ((int)n);
1346
1347 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1348
1349 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1350 /*
1351 * Can't skip server key exchange if this is an ephemeral
1352 * ciphersuite.
1353 */
1354 if (alg_k & (SSL_kDHE | SSL_kECDHE)) {
1355 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1356 al = SSL_AD_UNEXPECTED_MESSAGE;
1357 goto f_err;
1358 }
1359 #ifndef OPENSSL_NO_PSK
1360 /*
1361 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no
1362 * identity hint is sent. Set session->sess_cert anyway to avoid
1363 * problems later.
1364 */
1365 if (alg_k & SSL_kPSK) {
1366 s->session->sess_cert = ssl_sess_cert_new();
1367 if (s->ctx->psk_identity_hint)
1368 OPENSSL_free(s->ctx->psk_identity_hint);
1369 s->ctx->psk_identity_hint = NULL;
1370 }
1371 #endif
1372 s->s3->tmp.reuse_message = 1;
1373 return (1);
1374 }
1375
1376 param = p = (unsigned char *)s->init_msg;
1377 if (s->session->sess_cert != NULL) {
1378 #ifndef OPENSSL_NO_RSA
1379 if (s->session->sess_cert->peer_rsa_tmp != NULL) {
1380 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1381 s->session->sess_cert->peer_rsa_tmp = NULL;
1382 }
1383 #endif
1384 #ifndef OPENSSL_NO_DH
1385 if (s->session->sess_cert->peer_dh_tmp) {
1386 DH_free(s->session->sess_cert->peer_dh_tmp);
1387 s->session->sess_cert->peer_dh_tmp = NULL;
1388 }
1389 #endif
1390 #ifndef OPENSSL_NO_ECDH
1391 if (s->session->sess_cert->peer_ecdh_tmp) {
1392 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1393 s->session->sess_cert->peer_ecdh_tmp = NULL;
1394 }
1395 #endif
1396 } else {
1397 s->session->sess_cert = ssl_sess_cert_new();
1398 }
1399
1400 /* Total length of the parameters including the length prefix */
1401 param_len = 0;
1402
1403 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1404
1405 al = SSL_AD_DECODE_ERROR;
1406
1407 #ifndef OPENSSL_NO_PSK
1408 if (alg_k & SSL_kPSK) {
1409 char tmp_id_hint[PSK_MAX_IDENTITY_LEN + 1];
1410
1411 param_len = 2;
1412 if (param_len > n) {
1413 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1414 goto f_err;
1415 }
1416 n2s(p, i);
1417
1418 /*
1419 * Store PSK identity hint for later use, hint is used in
1420 * ssl3_send_client_key_exchange. Assume that the maximum length of
1421 * a PSK identity hint can be as long as the maximum length of a PSK
1422 * identity.
1423 */
1424 if (i > PSK_MAX_IDENTITY_LEN) {
1425 al = SSL_AD_HANDSHAKE_FAILURE;
1426 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
1427 goto f_err;
1428 }
1429 if (i > n - param_len) {
1430 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1431 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1432 goto f_err;
1433 }
1434 param_len += i;
1435
1436 /*
1437 * If received PSK identity hint contains NULL characters, the hint
1438 * is truncated from the first NULL. p may not be ending with NULL,
1439 * so create a NULL-terminated string.
1440 */
1441 memcpy(tmp_id_hint, p, i);
1442 memset(tmp_id_hint + i, 0, PSK_MAX_IDENTITY_LEN + 1 - i);
1443 if (s->ctx->psk_identity_hint != NULL)
1444 OPENSSL_free(s->ctx->psk_identity_hint);
1445 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1446 if (s->ctx->psk_identity_hint == NULL) {
1447 al = SSL_AD_HANDSHAKE_FAILURE;
1448 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1449 goto f_err;
1450 }
1451
1452 p += i;
1453 n -= param_len;
1454 } else
1455 #endif /* !OPENSSL_NO_PSK */
1456 #ifndef OPENSSL_NO_SRP
1457 if (alg_k & SSL_kSRP) {
1458 param_len = 2;
1459 if (param_len > n) {
1460 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1461 goto f_err;
1462 }
1463 n2s(p, i);
1464
1465 if (i > n - param_len) {
1466 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
1467 goto f_err;
1468 }
1469 param_len += i;
1470
1471 if (!(s->srp_ctx.N = BN_bin2bn(p, i, NULL))) {
1472 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1473 goto err;
1474 }
1475 p += i;
1476
1477 if (2 > n - param_len) {
1478 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1479 goto f_err;
1480 }
1481 param_len += 2;
1482
1483 n2s(p, i);
1484
1485 if (i > n - param_len) {
1486 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
1487 goto f_err;
1488 }
1489 param_len += i;
1490
1491 if (!(s->srp_ctx.g = BN_bin2bn(p, i, NULL))) {
1492 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1493 goto err;
1494 }
1495 p += i;
1496
1497 if (1 > n - param_len) {
1498 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1499 goto f_err;
1500 }
1501 param_len += 1;
1502
1503 i = (unsigned int)(p[0]);
1504 p++;
1505
1506 if (i > n - param_len) {
1507 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
1508 goto f_err;
1509 }
1510 param_len += i;
1511
1512 if (!(s->srp_ctx.s = BN_bin2bn(p, i, NULL))) {
1513 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1514 goto err;
1515 }
1516 p += i;
1517
1518 if (2 > n - param_len) {
1519 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1520 goto f_err;
1521 }
1522 param_len += 2;
1523
1524 n2s(p, i);
1525
1526 if (i > n - param_len) {
1527 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
1528 goto f_err;
1529 }
1530 param_len += i;
1531
1532 if (!(s->srp_ctx.B = BN_bin2bn(p, i, NULL))) {
1533 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1534 goto err;
1535 }
1536 p += i;
1537 n -= param_len;
1538
1539 if (!srp_verify_server_param(s, &al)) {
1540 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
1541 goto f_err;
1542 }
1543
1544 /* We must check if there is a certificate */
1545 # ifndef OPENSSL_NO_RSA
1546 if (alg_a & SSL_aRSA)
1547 pkey =
1548 X509_get_pubkey(s->session->
1549 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1550 # else
1551 if (0) ;
1552 # endif
1553 # ifndef OPENSSL_NO_DSA
1554 else if (alg_a & SSL_aDSS)
1555 pkey =
1556 X509_get_pubkey(s->session->
1557 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1558 x509);
1559 # endif
1560 } else
1561 #endif /* !OPENSSL_NO_SRP */
1562 #ifndef OPENSSL_NO_RSA
1563 if (alg_k & SSL_kRSA) {
1564 /* Temporary RSA keys only allowed in export ciphersuites */
1565 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1566 al = SSL_AD_UNEXPECTED_MESSAGE;
1567 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1568 goto f_err;
1569 }
1570 if ((rsa = RSA_new()) == NULL) {
1571 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1572 goto err;
1573 }
1574
1575 param_len = 2;
1576 if (param_len > n) {
1577 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1578 goto f_err;
1579 }
1580 n2s(p, i);
1581
1582 if (i > n - param_len) {
1583 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1584 goto f_err;
1585 }
1586 param_len += i;
1587
1588 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) {
1589 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1590 goto err;
1591 }
1592 p += i;
1593
1594 if (2 > n - param_len) {
1595 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1596 goto f_err;
1597 }
1598 param_len += 2;
1599
1600 n2s(p, i);
1601
1602 if (i > n - param_len) {
1603 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1604 goto f_err;
1605 }
1606 param_len += i;
1607
1608 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) {
1609 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1610 goto err;
1611 }
1612 p += i;
1613 n -= param_len;
1614
1615 /* this should be because we are using an export cipher */
1616 if (alg_a & SSL_aRSA)
1617 pkey =
1618 X509_get_pubkey(s->session->
1619 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1620 else {
1621 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1622 goto err;
1623 }
1624 s->session->sess_cert->peer_rsa_tmp = rsa;
1625 rsa = NULL;
1626 }
1627 #else /* OPENSSL_NO_RSA */
1628 if (0) ;
1629 #endif
1630 #ifndef OPENSSL_NO_DH
1631 else if (alg_k & SSL_kEDH) {
1632 if ((dh = DH_new()) == NULL) {
1633 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1634 goto err;
1635 }
1636
1637 param_len = 2;
1638 if (param_len > n) {
1639 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1640 goto f_err;
1641 }
1642 n2s(p, i);
1643
1644 if (i > n - param_len) {
1645 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1646 goto f_err;
1647 }
1648 param_len += i;
1649
1650 if (!(dh->p = BN_bin2bn(p, i, NULL))) {
1651 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1652 goto err;
1653 }
1654 p += i;
1655
1656 if (2 > n - param_len) {
1657 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1658 goto f_err;
1659 }
1660 param_len += 2;
1661
1662 n2s(p, i);
1663
1664 if (i > n - param_len) {
1665 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1666 goto f_err;
1667 }
1668 param_len += i;
1669
1670 if (!(dh->g = BN_bin2bn(p, i, NULL))) {
1671 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1672 goto err;
1673 }
1674 p += i;
1675
1676 if (2 > n - param_len) {
1677 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1678 goto f_err;
1679 }
1680 param_len += 2;
1681
1682 n2s(p, i);
1683
1684 if (i > n - param_len) {
1685 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1686 goto f_err;
1687 }
1688 param_len += i;
1689
1690 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) {
1691 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1692 goto err;
1693 }
1694 p += i;
1695 n -= param_len;
1696
1697 # ifndef OPENSSL_NO_RSA
1698 if (alg_a & SSL_aRSA)
1699 pkey =
1700 X509_get_pubkey(s->session->
1701 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1702 # else
1703 if (0) ;
1704 # endif
1705 # ifndef OPENSSL_NO_DSA
1706 else if (alg_a & SSL_aDSS)
1707 pkey =
1708 X509_get_pubkey(s->session->
1709 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1710 x509);
1711 # endif
1712 /* else anonymous DH, so no certificate or pkey. */
1713
1714 s->session->sess_cert->peer_dh_tmp = dh;
1715 dh = NULL;
1716 } else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd)) {
1717 al = SSL_AD_ILLEGAL_PARAMETER;
1718 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1719 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1720 goto f_err;
1721 }
1722 #endif /* !OPENSSL_NO_DH */
1723
1724 #ifndef OPENSSL_NO_ECDH
1725 else if (alg_k & SSL_kEECDH) {
1726 EC_GROUP *ngroup;
1727 const EC_GROUP *group;
1728
1729 if ((ecdh = EC_KEY_new()) == NULL) {
1730 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1731 goto err;
1732 }
1733
1734 /*
1735 * Extract elliptic curve parameters and the server's ephemeral ECDH
1736 * public key. Keep accumulating lengths of various components in
1737 * param_len and make sure it never exceeds n.
1738 */
1739
1740 /*
1741 * XXX: For now we only support named (not generic) curves and the
1742 * ECParameters in this case is just three bytes. We also need one
1743 * byte for the length of the encoded point
1744 */
1745 param_len = 4;
1746 if (param_len > n) {
1747 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1748 goto f_err;
1749 }
1750 /*
1751 * Check curve is one of our preferences, if not server has sent an
1752 * invalid curve. ECParameters is 3 bytes.
1753 */
1754 if (!tls1_check_curve(s, p, 3)) {
1755 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
1756 goto f_err;
1757 }
1758
1759 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) {
1760 al = SSL_AD_INTERNAL_ERROR;
1761 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1762 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1763 goto f_err;
1764 }
1765
1766 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1767 if (ngroup == NULL) {
1768 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1769 goto err;
1770 }
1771 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1772 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1773 goto err;
1774 }
1775 EC_GROUP_free(ngroup);
1776
1777 group = EC_KEY_get0_group(ecdh);
1778
1779 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1780 (EC_GROUP_get_degree(group) > 163)) {
1781 al = SSL_AD_EXPORT_RESTRICTION;
1782 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1783 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1784 goto f_err;
1785 }
1786
1787 p += 3;
1788
1789 /* Next, get the encoded ECPoint */
1790 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1791 ((bn_ctx = BN_CTX_new()) == NULL)) {
1792 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1793 goto err;
1794 }
1795
1796 encoded_pt_len = *p; /* length of encoded point */
1797 p += 1;
1798
1799 if ((encoded_pt_len > n - param_len) ||
1800 (EC_POINT_oct2point(group, srvr_ecpoint,
1801 p, encoded_pt_len, bn_ctx) == 0)) {
1802 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1803 goto f_err;
1804 }
1805 param_len += encoded_pt_len;
1806
1807 n -= param_len;
1808 p += encoded_pt_len;
1809
1810 /*
1811 * The ECC/TLS specification does not mention the use of DSA to sign
1812 * ECParameters in the server key exchange message. We do support RSA
1813 * and ECDSA.
1814 */
1815 if (0) ;
1816 # ifndef OPENSSL_NO_RSA
1817 else if (alg_a & SSL_aRSA)
1818 pkey =
1819 X509_get_pubkey(s->session->
1820 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1821 # endif
1822 # ifndef OPENSSL_NO_ECDSA
1823 else if (alg_a & SSL_aECDSA)
1824 pkey =
1825 X509_get_pubkey(s->session->
1826 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1827 # endif
1828 /* else anonymous ECDH, so no certificate or pkey. */
1829 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1830 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1831 ecdh = NULL;
1832 BN_CTX_free(bn_ctx);
1833 bn_ctx = NULL;
1834 EC_POINT_free(srvr_ecpoint);
1835 srvr_ecpoint = NULL;
1836 } else if (alg_k) {
1837 al = SSL_AD_UNEXPECTED_MESSAGE;
1838 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1839 goto f_err;
1840 }
1841 #endif /* !OPENSSL_NO_ECDH */
1842
1843 /* p points to the next byte, there are 'n' bytes left */
1844
1845 /* if it was signed, check the signature */
1846 if (pkey != NULL) {
1847 if (SSL_USE_SIGALGS(s)) {
1848 int rv;
1849 if (2 > n) {
1850 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1851 goto f_err;
1852 }
1853 rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1854 if (rv == -1)
1855 goto err;
1856 else if (rv == 0) {
1857 goto f_err;
1858 }
1859 #ifdef SSL_DEBUG
1860 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1861 #endif
1862 p += 2;
1863 n -= 2;
1864 } else
1865 md = EVP_sha1();
1866
1867 if (2 > n) {
1868 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1869 goto f_err;
1870 }
1871 n2s(p, i);
1872 n -= 2;
1873 j = EVP_PKEY_size(pkey);
1874
1875 /*
1876 * Check signature length. If n is 0 then signature is empty
1877 */
1878 if ((i != n) || (n > j) || (n <= 0)) {
1879 /* wrong packet length */
1880 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1881 goto f_err;
1882 }
1883 #ifndef OPENSSL_NO_RSA
1884 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
1885 int num;
1886 unsigned int size;
1887
1888 j = 0;
1889 q = md_buf;
1890 for (num = 2; num > 0; num--) {
1891 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1892 EVP_DigestInit_ex(&md_ctx, (num == 2)
1893 ? s->ctx->md5 : s->ctx->sha1, NULL);
1894 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1895 SSL3_RANDOM_SIZE);
1896 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1897 SSL3_RANDOM_SIZE);
1898 EVP_DigestUpdate(&md_ctx, param, param_len);
1899 EVP_DigestFinal_ex(&md_ctx, q, &size);
1900 q += size;
1901 j += size;
1902 }
1903 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
1904 if (i < 0) {
1905 al = SSL_AD_DECRYPT_ERROR;
1906 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
1907 goto f_err;
1908 }
1909 if (i == 0) {
1910 /* bad signature */
1911 al = SSL_AD_DECRYPT_ERROR;
1912 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1913 goto f_err;
1914 }
1915 } else
1916 #endif
1917 {
1918 EVP_VerifyInit_ex(&md_ctx, md, NULL);
1919 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1920 SSL3_RANDOM_SIZE);
1921 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1922 SSL3_RANDOM_SIZE);
1923 EVP_VerifyUpdate(&md_ctx, param, param_len);
1924 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1925 /* bad signature */
1926 al = SSL_AD_DECRYPT_ERROR;
1927 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1928 goto f_err;
1929 }
1930 }
1931 } else {
1932 /* aNULL, aSRP or kPSK do not need public keys */
1933 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) {
1934 /* Might be wrong key type, check it */
1935 if (ssl3_check_cert_and_algorithm(s))
1936 /* Otherwise this shouldn't happen */
1937 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1938 goto err;
1939 }
1940 /* still data left over */
1941 if (n != 0) {
1942 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
1943 goto f_err;
1944 }
1945 }
1946 EVP_PKEY_free(pkey);
1947 EVP_MD_CTX_cleanup(&md_ctx);
1948 return (1);
1949 f_err:
1950 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1951 err:
1952 EVP_PKEY_free(pkey);
1953 #ifndef OPENSSL_NO_RSA
1954 if (rsa != NULL)
1955 RSA_free(rsa);
1956 #endif
1957 #ifndef OPENSSL_NO_DH
1958 if (dh != NULL)
1959 DH_free(dh);
1960 #endif
1961 #ifndef OPENSSL_NO_ECDH
1962 BN_CTX_free(bn_ctx);
1963 EC_POINT_free(srvr_ecpoint);
1964 if (ecdh != NULL)
1965 EC_KEY_free(ecdh);
1966 #endif
1967 EVP_MD_CTX_cleanup(&md_ctx);
1968 return (-1);
1969 }
1970
1971 int ssl3_get_certificate_request(SSL *s)
1972 {
1973 int ok, ret = 0;
1974 unsigned long n, nc, l;
1975 unsigned int llen, ctype_num, i;
1976 X509_NAME *xn = NULL;
1977 const unsigned char *p, *q;
1978 unsigned char *d;
1979 STACK_OF(X509_NAME) *ca_sk = NULL;
1980
1981 n = s->method->ssl_get_message(s,
1982 SSL3_ST_CR_CERT_REQ_A,
1983 SSL3_ST_CR_CERT_REQ_B,
1984 -1, s->max_cert_list, &ok);
1985
1986 if (!ok)
1987 return ((int)n);
1988
1989 s->s3->tmp.cert_req = 0;
1990
1991 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
1992 s->s3->tmp.reuse_message = 1;
1993 /*
1994 * If we get here we don't need any cached handshake records as we
1995 * wont be doing client auth.
1996 */
1997 if (s->s3->handshake_buffer) {
1998 if (!ssl3_digest_cached_records(s))
1999 goto err;
2000 }
2001 return (1);
2002 }
2003
2004 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
2005 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2006 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
2007 goto err;
2008 }
2009
2010 /* TLS does not like anon-DH with client cert */
2011 if (s->version > SSL3_VERSION) {
2012 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
2013 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2014 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2015 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2016 goto err;
2017 }
2018 }
2019
2020 p = d = (unsigned char *)s->init_msg;
2021
2022 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
2023 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2024 goto err;
2025 }
2026
2027 /* get the certificate types */
2028 ctype_num = *(p++);
2029 if (s->cert->ctypes) {
2030 OPENSSL_free(s->cert->ctypes);
2031 s->cert->ctypes = NULL;
2032 }
2033 if (ctype_num > SSL3_CT_NUMBER) {
2034 /* If we exceed static buffer copy all to cert structure */
2035 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2036 memcpy(s->cert->ctypes, p, ctype_num);
2037 s->cert->ctype_num = (size_t)ctype_num;
2038 ctype_num = SSL3_CT_NUMBER;
2039 }
2040 for (i = 0; i < ctype_num; i++)
2041 s->s3->tmp.ctype[i] = p[i];
2042 p += p[-1];
2043 if (SSL_USE_SIGALGS(s)) {
2044 n2s(p, llen);
2045 /*
2046 * Check we have enough room for signature algorithms and following
2047 * length value.
2048 */
2049 if ((unsigned long)(p - d + llen + 2) > n) {
2050 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2051 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2052 SSL_R_DATA_LENGTH_TOO_LONG);
2053 goto err;
2054 }
2055 /* Clear certificate digests and validity flags */
2056 for (i = 0; i < SSL_PKEY_NUM; i++) {
2057 s->cert->pkeys[i].digest = NULL;
2058 s->cert->pkeys[i].valid_flags = 0;
2059 }
2060 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) {
2061 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2062 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2063 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2064 goto err;
2065 }
2066 if (!tls1_process_sigalgs(s)) {
2067 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2068 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2069 goto err;
2070 }
2071 p += llen;
2072 }
2073
2074 /* get the CA RDNs */
2075 n2s(p, llen);
2076 #if 0
2077 {
2078 FILE *out;
2079 out = fopen("/tmp/vsign.der", "w");
2080 fwrite(p, 1, llen, out);
2081 fclose(out);
2082 }
2083 #endif
2084
2085 if ((unsigned long)(p - d + llen) != n) {
2086 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2087 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
2088 goto err;
2089 }
2090
2091 for (nc = 0; nc < llen;) {
2092 n2s(p, l);
2093 if ((l + nc + 2) > llen) {
2094 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2095 goto cont; /* netscape bugs */
2096 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2097 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
2098 goto err;
2099 }
2100
2101 q = p;
2102
2103 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
2104 /* If netscape tolerance is on, ignore errors */
2105 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2106 goto cont;
2107 else {
2108 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2109 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
2110 goto err;
2111 }
2112 }
2113
2114 if (q != (p + l)) {
2115 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2116 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2117 SSL_R_CA_DN_LENGTH_MISMATCH);
2118 goto err;
2119 }
2120 if (!sk_X509_NAME_push(ca_sk, xn)) {
2121 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2122 goto err;
2123 }
2124
2125 p += l;
2126 nc += l + 2;
2127 }
2128
2129 if (0) {
2130 cont:
2131 ERR_clear_error();
2132 }
2133
2134 /* we should setup a certificate to return.... */
2135 s->s3->tmp.cert_req = 1;
2136 s->s3->tmp.ctype_num = ctype_num;
2137 if (s->s3->tmp.ca_names != NULL)
2138 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
2139 s->s3->tmp.ca_names = ca_sk;
2140 ca_sk = NULL;
2141
2142 ret = 1;
2143 err:
2144 if (ca_sk != NULL)
2145 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
2146 return (ret);
2147 }
2148
2149 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
2150 {
2151 return (X509_NAME_cmp(*a, *b));
2152 }
2153
2154 #ifndef OPENSSL_NO_TLSEXT
2155 int ssl3_get_new_session_ticket(SSL *s)
2156 {
2157 int ok, al, ret = 0, ticklen;
2158 long n;
2159 const unsigned char *p;
2160 unsigned char *d;
2161
2162 n = s->method->ssl_get_message(s,
2163 SSL3_ST_CR_SESSION_TICKET_A,
2164 SSL3_ST_CR_SESSION_TICKET_B,
2165 SSL3_MT_NEWSESSION_TICKET, 16384, &ok);
2166
2167 if (!ok)
2168 return ((int)n);
2169
2170 if (n < 6) {
2171 /* need at least ticket_lifetime_hint + ticket length */
2172 al = SSL_AD_DECODE_ERROR;
2173 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2174 goto f_err;
2175 }
2176
2177 p = d = (unsigned char *)s->init_msg;
2178 n2l(p, s->session->tlsext_tick_lifetime_hint);
2179 n2s(p, ticklen);
2180 /* ticket_lifetime_hint + ticket_length + ticket */
2181 if (ticklen + 6 != n) {
2182 al = SSL_AD_DECODE_ERROR;
2183 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2184 goto f_err;
2185 }
2186 if (s->session->tlsext_tick) {
2187 OPENSSL_free(s->session->tlsext_tick);
2188 s->session->tlsext_ticklen = 0;
2189 }
2190 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2191 if (!s->session->tlsext_tick) {
2192 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2193 goto err;
2194 }
2195 memcpy(s->session->tlsext_tick, p, ticklen);
2196 s->session->tlsext_ticklen = ticklen;
2197 /*
2198 * There are two ways to detect a resumed ticket session. One is to set
2199 * an appropriate session ID and then the server must return a match in
2200 * ServerHello. This allows the normal client session ID matching to work
2201 * and we know much earlier that the ticket has been accepted. The
2202 * other way is to set zero length session ID when the ticket is
2203 * presented and rely on the handshake to determine session resumption.
2204 * We choose the former approach because this fits in with assumptions
2205 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
2206 * SHA256 is disabled) hash of the ticket.
2207 */
2208 EVP_Digest(p, ticklen,
2209 s->session->session_id, &s->session->session_id_length,
2210 # ifndef OPENSSL_NO_SHA256
2211 EVP_sha256(), NULL);
2212 # else
2213 EVP_sha1(), NULL);
2214 # endif
2215 ret = 1;
2216 return (ret);
2217 f_err:
2218 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2219 err:
2220 return (-1);
2221 }
2222
2223 int ssl3_get_cert_status(SSL *s)
2224 {
2225 int ok, al;
2226 unsigned long resplen, n;
2227 const unsigned char *p;
2228
2229 n = s->method->ssl_get_message(s,
2230 SSL3_ST_CR_CERT_STATUS_A,
2231 SSL3_ST_CR_CERT_STATUS_B,
2232 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
2233
2234 if (!ok)
2235 return ((int)n);
2236 if (n < 4) {
2237 /* need at least status type + length */
2238 al = SSL_AD_DECODE_ERROR;
2239 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2240 goto f_err;
2241 }
2242 p = (unsigned char *)s->init_msg;
2243 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
2244 al = SSL_AD_DECODE_ERROR;
2245 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
2246 goto f_err;
2247 }
2248 n2l3(p, resplen);
2249 if (resplen + 4 != n) {
2250 al = SSL_AD_DECODE_ERROR;
2251 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2252 goto f_err;
2253 }
2254 if (s->tlsext_ocsp_resp)
2255 OPENSSL_free(s->tlsext_ocsp_resp);
2256 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2257 if (!s->tlsext_ocsp_resp) {
2258 al = SSL_AD_INTERNAL_ERROR;
2259 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2260 goto f_err;
2261 }
2262 s->tlsext_ocsp_resplen = resplen;
2263 if (s->ctx->tlsext_status_cb) {
2264 int ret;
2265 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2266 if (ret == 0) {
2267 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2268 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
2269 goto f_err;
2270 }
2271 if (ret < 0) {
2272 al = SSL_AD_INTERNAL_ERROR;
2273 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2274 goto f_err;
2275 }
2276 }
2277 return 1;
2278 f_err:
2279 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2280 return (-1);
2281 }
2282 #endif
2283
2284 int ssl3_get_server_done(SSL *s)
2285 {
2286 int ok, ret = 0;
2287 long n;
2288
2289 /* Second to last param should be very small, like 0 :-) */
2290 n = s->method->ssl_get_message(s,
2291 SSL3_ST_CR_SRVR_DONE_A,
2292 SSL3_ST_CR_SRVR_DONE_B,
2293 SSL3_MT_SERVER_DONE, 30, &ok);
2294
2295 if (!ok)
2296 return ((int)n);
2297 if (n > 0) {
2298 /* should contain no data */
2299 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2300 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
2301 return -1;
2302 }
2303 ret = 1;
2304 return (ret);
2305 }
2306
2307 int ssl3_send_client_key_exchange(SSL *s)
2308 {
2309 unsigned char *p;
2310 int n;
2311 unsigned long alg_k;
2312 #ifndef OPENSSL_NO_RSA
2313 unsigned char *q;
2314 EVP_PKEY *pkey = NULL;
2315 #endif
2316 #ifndef OPENSSL_NO_KRB5
2317 KSSL_ERR kssl_err;
2318 #endif /* OPENSSL_NO_KRB5 */
2319 #ifndef OPENSSL_NO_ECDH
2320 EC_KEY *clnt_ecdh = NULL;
2321 const EC_POINT *srvr_ecpoint = NULL;
2322 EVP_PKEY *srvr_pub_pkey = NULL;
2323 unsigned char *encodedPoint = NULL;
2324 int encoded_pt_len = 0;
2325 BN_CTX *bn_ctx = NULL;
2326 #endif
2327
2328 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
2329 p = ssl_handshake_start(s);
2330
2331 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2332
2333 /* Fool emacs indentation */
2334 if (0) {
2335 }
2336 #ifndef OPENSSL_NO_RSA
2337 else if (alg_k & SSL_kRSA) {
2338 RSA *rsa;
2339 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2340
2341 if (s->session->sess_cert == NULL) {
2342 /*
2343 * We should always have a server certificate with SSL_kRSA.
2344 */
2345 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2346 ERR_R_INTERNAL_ERROR);
2347 goto err;
2348 }
2349
2350 if (s->session->sess_cert->peer_rsa_tmp != NULL)
2351 rsa = s->session->sess_cert->peer_rsa_tmp;
2352 else {
2353 pkey =
2354 X509_get_pubkey(s->session->
2355 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
2356 x509);
2357 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
2358 || (pkey->pkey.rsa == NULL)) {
2359 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2360 ERR_R_INTERNAL_ERROR);
2361 goto err;
2362 }
2363 rsa = pkey->pkey.rsa;
2364 EVP_PKEY_free(pkey);
2365 }
2366
2367 tmp_buf[0] = s->client_version >> 8;
2368 tmp_buf[1] = s->client_version & 0xff;
2369 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2370 goto err;
2371
2372 s->session->master_key_length = sizeof tmp_buf;
2373
2374 q = p;
2375 /* Fix buf for TLS and beyond */
2376 if (s->version > SSL3_VERSION)
2377 p += 2;
2378 n = RSA_public_encrypt(sizeof tmp_buf,
2379 tmp_buf, p, rsa, RSA_PKCS1_PADDING);
2380 # ifdef PKCS1_CHECK
2381 if (s->options & SSL_OP_PKCS1_CHECK_1)
2382 p[1]++;
2383 if (s->options & SSL_OP_PKCS1_CHECK_2)
2384 tmp_buf[0] = 0x70;
2385 # endif
2386 if (n <= 0) {
2387 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2388 SSL_R_BAD_RSA_ENCRYPT);
2389 goto err;
2390 }
2391
2392 /* Fix buf for TLS and beyond */
2393 if (s->version > SSL3_VERSION) {
2394 s2n(n, q);
2395 n += 2;
2396 }
2397
2398 s->session->master_key_length =
2399 s->method->ssl3_enc->generate_master_secret(s,
2400 s->
2401 session->master_key,
2402 tmp_buf,
2403 sizeof tmp_buf);
2404 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2405 }
2406 #endif
2407 #ifndef OPENSSL_NO_KRB5
2408 else if (alg_k & SSL_kKRB5) {
2409 krb5_error_code krb5rc;
2410 KSSL_CTX *kssl_ctx = s->kssl_ctx;
2411 /* krb5_data krb5_ap_req; */
2412 krb5_data *enc_ticket;
2413 krb5_data authenticator, *authp = NULL;
2414 EVP_CIPHER_CTX ciph_ctx;
2415 const EVP_CIPHER *enc = NULL;
2416 unsigned char iv[EVP_MAX_IV_LENGTH];
2417 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2418 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
2419 int padl, outl = sizeof(epms);
2420
2421 EVP_CIPHER_CTX_init(&ciph_ctx);
2422
2423 # ifdef KSSL_DEBUG
2424 fprintf(stderr, "ssl3_send_client_key_exchange(%lx & %lx)\n",
2425 alg_k, SSL_kKRB5);
2426 # endif /* KSSL_DEBUG */
2427
2428 authp = NULL;
2429 # ifdef KRB5SENDAUTH
2430 if (KRB5SENDAUTH)
2431 authp = &authenticator;
2432 # endif /* KRB5SENDAUTH */
2433
2434 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
2435 enc = kssl_map_enc(kssl_ctx->enctype);
2436 if (enc == NULL)
2437 goto err;
2438 # ifdef KSSL_DEBUG
2439 {
2440 fprintf(stderr, "kssl_cget_tkt rtn %d\n", krb5rc);
2441 if (krb5rc && kssl_err.text)
2442 fprintf(stderr, "kssl_cget_tkt kssl_err=%s\n",
2443 kssl_err.text);
2444 }
2445 # endif /* KSSL_DEBUG */
2446
2447 if (krb5rc) {
2448 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2449 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
2450 goto err;
2451 }
2452
2453 /*-
2454 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
2455 * in place of RFC 2712 KerberosWrapper, as in:
2456 *
2457 * Send ticket (copy to *p, set n = length)
2458 * n = krb5_ap_req.length;
2459 * memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2460 * if (krb5_ap_req.data)
2461 * kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2462 *
2463 * Now using real RFC 2712 KerberosWrapper
2464 * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2465 * Note: 2712 "opaque" types are here replaced
2466 * with a 2-byte length followed by the value.
2467 * Example:
2468 * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2469 * Where "xx xx" = length bytes. Shown here with
2470 * optional authenticator omitted.
2471 */
2472
2473 /* KerberosWrapper.Ticket */
2474 s2n(enc_ticket->length, p);
2475 memcpy(p, enc_ticket->data, enc_ticket->length);
2476 p += enc_ticket->length;
2477 n = enc_ticket->length + 2;
2478
2479 /* KerberosWrapper.Authenticator */
2480 if (authp && authp->length) {
2481 s2n(authp->length, p);
2482 memcpy(p, authp->data, authp->length);
2483 p += authp->length;
2484 n += authp->length + 2;
2485
2486 free(authp->data);
2487 authp->data = NULL;
2488 authp->length = 0;
2489 } else {
2490 s2n(0, p); /* null authenticator length */
2491 n += 2;
2492 }
2493
2494 tmp_buf[0] = s->client_version >> 8;
2495 tmp_buf[1] = s->client_version & 0xff;
2496 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2497 goto err;
2498
2499 /*-
2500 * 20010420 VRS. Tried it this way; failed.
2501 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2502 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2503 * kssl_ctx->length);
2504 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2505 */
2506
2507 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2508 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
2509 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
2510 sizeof tmp_buf);
2511 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
2512 outl += padl;
2513 if (outl > (int)sizeof epms) {
2514 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2515 ERR_R_INTERNAL_ERROR);
2516 goto err;
2517 }
2518 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2519
2520 /* KerberosWrapper.EncryptedPreMasterSecret */
2521 s2n(outl, p);
2522 memcpy(p, epms, outl);
2523 p += outl;
2524 n += outl + 2;
2525
2526 s->session->master_key_length =
2527 s->method->ssl3_enc->generate_master_secret(s,
2528 s->
2529 session->master_key,
2530 tmp_buf,
2531 sizeof tmp_buf);
2532
2533 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2534 OPENSSL_cleanse(epms, outl);
2535 }
2536 #endif
2537 #ifndef OPENSSL_NO_DH
2538 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
2539 DH *dh_srvr, *dh_clnt;
2540 SESS_CERT *scert = s->session->sess_cert;
2541
2542 if (scert == NULL) {
2543 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2544 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2545 SSL_R_UNEXPECTED_MESSAGE);
2546 goto err;
2547 }
2548
2549 if (scert->peer_dh_tmp != NULL)
2550 dh_srvr = scert->peer_dh_tmp;
2551 else {
2552 /* we get them from the cert */
2553 int idx = scert->peer_cert_type;
2554 EVP_PKEY *spkey = NULL;
2555 dh_srvr = NULL;
2556 if (idx >= 0)
2557 spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509);
2558 if (spkey) {
2559 dh_srvr = EVP_PKEY_get1_DH(spkey);
2560 EVP_PKEY_free(spkey);
2561 }
2562 if (dh_srvr == NULL) {
2563 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2564 ERR_R_INTERNAL_ERROR);
2565 goto err;
2566 }
2567 }
2568 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
2569 /* Use client certificate key */
2570 EVP_PKEY *clkey = s->cert->key->privatekey;
2571 dh_clnt = NULL;
2572 if (clkey)
2573 dh_clnt = EVP_PKEY_get1_DH(clkey);
2574 if (dh_clnt == NULL) {
2575 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2576 ERR_R_INTERNAL_ERROR);
2577 goto err;
2578 }
2579 } else {
2580 /* generate a new random key */
2581 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2582 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2583 goto err;
2584 }
2585 if (!DH_generate_key(dh_clnt)) {
2586 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2587 DH_free(dh_clnt);
2588 goto err;
2589 }
2590 }
2591
2592 /*
2593 * use the 'p' output buffer for the DH key, but make sure to
2594 * clear it out afterwards
2595 */
2596
2597 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
2598 if (scert->peer_dh_tmp == NULL)
2599 DH_free(dh_srvr);
2600
2601 if (n <= 0) {
2602 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2603 DH_free(dh_clnt);
2604 goto err;
2605 }
2606
2607 /* generate master key from the result */
2608 s->session->master_key_length =
2609 s->method->ssl3_enc->generate_master_secret(s,
2610 s->
2611 session->master_key,
2612 p, n);
2613 /* clean up */
2614 memset(p, 0, n);
2615
2616 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2617 n = 0;
2618 else {
2619 /* send off the data */
2620 n = BN_num_bytes(dh_clnt->pub_key);
2621 s2n(n, p);
2622 BN_bn2bin(dh_clnt->pub_key, p);
2623 n += 2;
2624 }
2625
2626 DH_free(dh_clnt);
2627
2628 /* perhaps clean things up a bit EAY EAY EAY EAY */
2629 }
2630 #endif
2631
2632 #ifndef OPENSSL_NO_ECDH
2633 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) {
2634 const EC_GROUP *srvr_group = NULL;
2635 EC_KEY *tkey;
2636 int ecdh_clnt_cert = 0;
2637 int field_size = 0;
2638
2639 if (s->session->sess_cert == NULL) {
2640 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2641 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2642 SSL_R_UNEXPECTED_MESSAGE);
2643 goto err;
2644 }
2645
2646 /*
2647 * Did we send out the client's ECDH share for use in premaster
2648 * computation as part of client certificate? If so, set
2649 * ecdh_clnt_cert to 1.
2650 */
2651 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
2652 /*-
2653 * XXX: For now, we do not support client
2654 * authentication using ECDH certificates.
2655 * To add such support, one needs to add
2656 * code that checks for appropriate
2657 * conditions and sets ecdh_clnt_cert to 1.
2658 * For example, the cert have an ECC
2659 * key on the same curve as the server's
2660 * and the key should be authorized for
2661 * key agreement.
2662 *
2663 * One also needs to add code in ssl3_connect
2664 * to skip sending the certificate verify
2665 * message.
2666 *
2667 * if ((s->cert->key->privatekey != NULL) &&
2668 * (s->cert->key->privatekey->type ==
2669 * EVP_PKEY_EC) && ...)
2670 * ecdh_clnt_cert = 1;
2671 */
2672 }
2673
2674 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2675 tkey = s->session->sess_cert->peer_ecdh_tmp;
2676 } else {
2677 /* Get the Server Public Key from Cert */
2678 srvr_pub_pkey =
2679 X509_get_pubkey(s->session->
2680 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2681 if ((srvr_pub_pkey == NULL)
2682 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2683 || (srvr_pub_pkey->pkey.ec == NULL)) {
2684 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2685 ERR_R_INTERNAL_ERROR);
2686 goto err;
2687 }
2688
2689 tkey = srvr_pub_pkey->pkey.ec;
2690 }
2691
2692 srvr_group = EC_KEY_get0_group(tkey);
2693 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2694
2695 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2696 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2697 ERR_R_INTERNAL_ERROR);
2698 goto err;
2699 }
2700
2701 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2702 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2703 ERR_R_MALLOC_FAILURE);
2704 goto err;
2705 }
2706
2707 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2708 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2709 goto err;
2710 }
2711 if (ecdh_clnt_cert) {
2712 /*
2713 * Reuse key info from our certificate We only need our
2714 * private key to perform the ECDH computation.
2715 */
2716 const BIGNUM *priv_key;
2717 tkey = s->cert->key->privatekey->pkey.ec;
2718 priv_key = EC_KEY_get0_private_key(tkey);
2719 if (priv_key == NULL) {
2720 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2721 ERR_R_MALLOC_FAILURE);
2722 goto err;
2723 }
2724 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2725 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2726 goto err;
2727 }
2728 } else {
2729 /* Generate a new ECDH key pair */
2730 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2731 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2732 ERR_R_ECDH_LIB);
2733 goto err;
2734 }
2735 }
2736
2737 /*
2738 * use the 'p' output buffer for the ECDH key, but make sure to
2739 * clear it out afterwards
2740 */
2741
2742 field_size = EC_GROUP_get_degree(srvr_group);
2743 if (field_size <= 0) {
2744 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2745 goto err;
2746 }
2747 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint,
2748 clnt_ecdh, NULL);
2749 if (n <= 0) {
2750 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2751 goto err;
2752 }
2753
2754 /* generate master key from the result */
2755 s->session->master_key_length =
2756 s->method->ssl3_enc->generate_master_secret(s,
2757 s->
2758 session->master_key,
2759 p, n);
2760
2761 memset(p, 0, n); /* clean up */
2762
2763 if (ecdh_clnt_cert) {
2764 /* Send empty client key exch message */
2765 n = 0;
2766 } else {
2767 /*
2768 * First check the size of encoding and allocate memory
2769 * accordingly.
2770 */
2771 encoded_pt_len =
2772 EC_POINT_point2oct(srvr_group,
2773 EC_KEY_get0_public_key(clnt_ecdh),
2774 POINT_CONVERSION_UNCOMPRESSED,
2775 NULL, 0, NULL);
2776
2777 encodedPoint = (unsigned char *)
2778 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2779 bn_ctx = BN_CTX_new();
2780 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2781 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2782 ERR_R_MALLOC_FAILURE);
2783 goto err;
2784 }
2785
2786 /* Encode the public key */
2787 n = EC_POINT_point2oct(srvr_group,
2788 EC_KEY_get0_public_key(clnt_ecdh),
2789 POINT_CONVERSION_UNCOMPRESSED,
2790 encodedPoint, encoded_pt_len, bn_ctx);
2791
2792 *p = n; /* length of encoded point */
2793 /* Encoded point will be copied here */
2794 p += 1;
2795 /* copy the point */
2796 memcpy((unsigned char *)p, encodedPoint, n);
2797 /* increment n to account for length field */
2798 n += 1;
2799 }
2800
2801 /* Free allocated memory */
2802 BN_CTX_free(bn_ctx);
2803 if (encodedPoint != NULL)
2804 OPENSSL_free(encodedPoint);
2805 if (clnt_ecdh != NULL)
2806 EC_KEY_free(clnt_ecdh);
2807 EVP_PKEY_free(srvr_pub_pkey);
2808 }
2809 #endif /* !OPENSSL_NO_ECDH */
2810 else if (alg_k & SSL_kGOST) {
2811 /* GOST key exchange message creation */
2812 EVP_PKEY_CTX *pkey_ctx;
2813 X509 *peer_cert;
2814 size_t msglen;
2815 unsigned int md_len;
2816 int keytype;
2817 unsigned char premaster_secret[32], shared_ukm[32], tmp[256];
2818 EVP_MD_CTX *ukm_hash;
2819 EVP_PKEY *pub_key;
2820
2821 /*
2822 * Get server sertificate PKEY and create ctx from it
2823 */
2824 peer_cert =
2825 s->session->
2826 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509;
2827 if (!peer_cert)
2828 peer_cert =
2829 s->session->
2830 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509;
2831 if (!peer_cert) {
2832 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2833 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2834 goto err;
2835 }
2836
2837 pkey_ctx = EVP_PKEY_CTX_new(pub_key =
2838 X509_get_pubkey(peer_cert), NULL);
2839 /*
2840 * If we have send a certificate, and certificate key
2841 *
2842 * * parameters match those of server certificate, use
2843 * certificate key for key exchange
2844 */
2845
2846 /* Otherwise, generate ephemeral key pair */
2847
2848 EVP_PKEY_encrypt_init(pkey_ctx);
2849 /* Generate session key */
2850 RAND_bytes(premaster_secret, 32);
2851 /*
2852 * If we have client certificate, use its secret as peer key
2853 */
2854 if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2855 if (EVP_PKEY_derive_set_peer
2856 (pkey_ctx, s->cert->key->privatekey) <= 0) {
2857 /*
2858 * If there was an error - just ignore it. Ephemeral key
2859 * * would be used
2860 */
2861 ERR_clear_error();
2862 }
2863 }
2864 /*
2865 * Compute shared IV and store it in algorithm-specific context
2866 * data
2867 */
2868 ukm_hash = EVP_MD_CTX_create();
2869 EVP_DigestInit(ukm_hash,
2870 EVP_get_digestbynid(NID_id_GostR3411_94));
2871 EVP_DigestUpdate(ukm_hash, s->s3->client_random,
2872 SSL3_RANDOM_SIZE);
2873 EVP_DigestUpdate(ukm_hash, s->s3->server_random,
2874 SSL3_RANDOM_SIZE);
2875 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2876 EVP_MD_CTX_destroy(ukm_hash);
2877 if (EVP_PKEY_CTX_ctrl
2878 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8,
2879 shared_ukm) < 0) {
2880 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2881 SSL_R_LIBRARY_BUG);
2882 goto err;
2883 }
2884 /* Make GOST keytransport blob message */
2885 /*
2886 * Encapsulate it into sequence
2887 */
2888 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2889 msglen = 255;
2890 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 32)
2891 < 0) {
2892 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2893 SSL_R_LIBRARY_BUG);
2894 goto err;
2895 }
2896 if (msglen >= 0x80) {
2897 *(p++) = 0x81;
2898 *(p++) = msglen & 0xff;
2899 n = msglen + 3;
2900 } else {
2901 *(p++) = msglen & 0xff;
2902 n = msglen + 2;
2903 }
2904 memcpy(p, tmp, msglen);
2905 /* Check if pubkey from client certificate was used */
2906 if (EVP_PKEY_CTX_ctrl
2907 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) {
2908 /* Set flag "skip certificate verify" */
2909 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2910 }
2911 EVP_PKEY_CTX_free(pkey_ctx);
2912 s->session->master_key_length =
2913 s->method->ssl3_enc->generate_master_secret(s,
2914 s->
2915 session->master_key,
2916 premaster_secret,
2917 32);
2918 EVP_PKEY_free(pub_key);
2919
2920 }
2921 #ifndef OPENSSL_NO_SRP
2922 else if (alg_k & SSL_kSRP) {
2923 if (s->srp_ctx.A != NULL) {
2924 /* send off the data */
2925 n = BN_num_bytes(s->srp_ctx.A);
2926 s2n(n, p);
2927 BN_bn2bin(s->srp_ctx.A, p);
2928 n += 2;
2929 } else {
2930 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2931 ERR_R_INTERNAL_ERROR);
2932 goto err;
2933 }
2934 if (s->session->srp_username != NULL)
2935 OPENSSL_free(s->session->srp_username);
2936 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2937 if (s->session->srp_username == NULL) {
2938 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2939 ERR_R_MALLOC_FAILURE);
2940 goto err;
2941 }
2942
2943 if ((s->session->master_key_length =
2944 SRP_generate_client_master_secret(s,
2945 s->session->master_key)) <
2946 0) {
2947 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2948 ERR_R_INTERNAL_ERROR);
2949 goto err;
2950 }
2951 }
2952 #endif
2953 #ifndef OPENSSL_NO_PSK
2954 else if (alg_k & SSL_kPSK) {
2955 /*
2956 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
2957 * \0-terminated identity. The last byte is for us for simulating
2958 * strnlen.
2959 */
2960 char identity[PSK_MAX_IDENTITY_LEN + 2];
2961 size_t identity_len;
2962 unsigned char *t = NULL;
2963 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4];
2964 unsigned int pre_ms_len = 0, psk_len = 0;
2965 int psk_err = 1;
2966
2967 n = 0;
2968 if (s->psk_client_callback == NULL) {
2969 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2970 SSL_R_PSK_NO_CLIENT_CB);
2971 goto err;
2972 }
2973
2974 memset(identity, 0, sizeof(identity));
2975 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2976 identity, sizeof(identity) - 1,
2977 psk_or_pre_ms,
2978 sizeof(psk_or_pre_ms));
2979 if (psk_len > PSK_MAX_PSK_LEN) {
2980 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2981 ERR_R_INTERNAL_ERROR);
2982 goto psk_err;
2983 } else if (psk_len == 0) {
2984 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2985 SSL_R_PSK_IDENTITY_NOT_FOUND);
2986 goto psk_err;
2987 }
2988 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
2989 identity_len = strlen(identity);
2990 if (identity_len > PSK_MAX_IDENTITY_LEN) {
2991 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2992 ERR_R_INTERNAL_ERROR);
2993 goto psk_err;
2994 }
2995 /* create PSK pre_master_secret */
2996 pre_ms_len = 2 + psk_len + 2 + psk_len;
2997 t = psk_or_pre_ms;
2998 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len);
2999 s2n(psk_len, t);
3000 memset(t, 0, psk_len);
3001 t += psk_len;
3002 s2n(psk_len, t);
3003
3004 if (s->session->psk_identity_hint != NULL)
3005 OPENSSL_free(s->session->psk_identity_hint);
3006 s->session->psk_identity_hint =
3007 BUF_strdup(s->ctx->psk_identity_hint);
3008 if (s->ctx->psk_identity_hint != NULL
3009 && s->session->psk_identity_hint == NULL) {
3010 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3011 ERR_R_MALLOC_FAILURE);
3012 goto psk_err;
3013 }
3014
3015 if (s->session->psk_identity != NULL)
3016 OPENSSL_free(s->session->psk_identity);
3017 s->session->psk_identity = BUF_strdup(identity);
3018 if (s->session->psk_identity == NULL) {
3019 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3020 ERR_R_MALLOC_FAILURE);
3021 goto psk_err;
3022 }
3023
3024 s->session->master_key_length =
3025 s->method->ssl3_enc->generate_master_secret(s,
3026 s->
3027 session->master_key,
3028 psk_or_pre_ms,
3029 pre_ms_len);
3030 s2n(identity_len, p);
3031 memcpy(p, identity, identity_len);
3032 n = 2 + identity_len;
3033 psk_err = 0;
3034 psk_err:
3035 OPENSSL_cleanse(identity, sizeof(identity));
3036 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3037 if (psk_err != 0) {
3038 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3039 goto err;
3040 }
3041 }
3042 #endif
3043 else {
3044 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3045 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3046 goto err;
3047 }
3048
3049 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3050 s->state = SSL3_ST_CW_KEY_EXCH_B;
3051 }
3052
3053 /* SSL3_ST_CW_KEY_EXCH_B */
3054 return ssl_do_write(s);
3055 err:
3056 #ifndef OPENSSL_NO_ECDH
3057 BN_CTX_free(bn_ctx);
3058 if (encodedPoint != NULL)
3059 OPENSSL_free(encodedPoint);
3060 if (clnt_ecdh != NULL)
3061 EC_KEY_free(clnt_ecdh);
3062 EVP_PKEY_free(srvr_pub_pkey);
3063 #endif
3064 return (-1);
3065 }
3066
3067 int ssl3_send_client_verify(SSL *s)
3068 {
3069 unsigned char *p;
3070 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
3071 EVP_PKEY *pkey;
3072 EVP_PKEY_CTX *pctx = NULL;
3073 EVP_MD_CTX mctx;
3074 unsigned u = 0;
3075 unsigned long n;
3076 int j;
3077
3078 EVP_MD_CTX_init(&mctx);
3079
3080 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
3081 p = ssl_handshake_start(s);
3082 pkey = s->cert->key->privatekey;
3083 /* Create context from key and test if sha1 is allowed as digest */
3084 pctx = EVP_PKEY_CTX_new(pkey, NULL);
3085 EVP_PKEY_sign_init(pctx);
3086 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
3087 if (!SSL_USE_SIGALGS(s))
3088 s->method->ssl3_enc->cert_verify_mac(s,
3089 NID_sha1,
3090 &(data
3091 [MD5_DIGEST_LENGTH]));
3092 } else {
3093 ERR_clear_error();
3094 }
3095 /*
3096 * For TLS v1.2 send signature algorithm and signature using agreed
3097 * digest and cached handshake records.
3098 */
3099 if (SSL_USE_SIGALGS(s)) {
3100 long hdatalen = 0;
3101 void *hdata;
3102 const EVP_MD *md = s->cert->key->digest;
3103 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3104 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) {
3105 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3106 goto err;
3107 }
3108 p += 2;
3109 #ifdef SSL_DEBUG
3110 fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3111 EVP_MD_name(md));
3112 #endif
3113 if (!EVP_SignInit_ex(&mctx, md, NULL)
3114 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3115 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
3116 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB);
3117 goto err;
3118 }
3119 s2n(u, p);
3120 n = u + 4;
3121 if (!ssl3_digest_cached_records(s))
3122 goto err;
3123 } else
3124 #ifndef OPENSSL_NO_RSA
3125 if (pkey->type == EVP_PKEY_RSA) {
3126 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
3127 if (RSA_sign(NID_md5_sha1, data,
3128 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
3129 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
3130 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
3131 goto err;
3132 }
3133 s2n(u, p);
3134 n = u + 2;
3135 } else
3136 #endif
3137 #ifndef OPENSSL_NO_DSA
3138 if (pkey->type == EVP_PKEY_DSA) {
3139 if (!DSA_sign(pkey->save_type,
3140 &(data[MD5_DIGEST_LENGTH]),
3141 SHA_DIGEST_LENGTH, &(p[2]),
3142 (unsigned int *)&j, pkey->pkey.dsa)) {
3143 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
3144 goto err;
3145 }
3146 s2n(j, p);
3147 n = j + 2;
3148 } else
3149 #endif
3150 #ifndef OPENSSL_NO_ECDSA
3151 if (pkey->type == EVP_PKEY_EC) {
3152 if (!ECDSA_sign(pkey->save_type,
3153 &(data[MD5_DIGEST_LENGTH]),
3154 SHA_DIGEST_LENGTH, &(p[2]),
3155 (unsigned int *)&j, pkey->pkey.ec)) {
3156 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
3157 goto err;
3158 }
3159 s2n(j, p);
3160 n = j + 2;
3161 } else
3162 #endif
3163 if (pkey->type == NID_id_GostR3410_94
3164 || pkey->type == NID_id_GostR3410_2001) {
3165 unsigned char signbuf[64];
3166 int i;
3167 size_t sigsize = 64;
3168 s->method->ssl3_enc->cert_verify_mac(s,
3169 NID_id_GostR3411_94, data);
3170 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3171 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3172 goto err;
3173 }
3174 for (i = 63, j = 0; i >= 0; j++, i--) {
3175 p[2 + j] = signbuf[i];
3176 }
3177 s2n(j, p);
3178 n = j + 2;
3179 } else {
3180 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3181 goto err;
3182 }
3183 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3184 s->state = SSL3_ST_CW_CERT_VRFY_B;
3185 }
3186 EVP_MD_CTX_cleanup(&mctx);
3187 EVP_PKEY_CTX_free(pctx);
3188 return ssl_do_write(s);
3189 err:
3190 EVP_MD_CTX_cleanup(&mctx);
3191 EVP_PKEY_CTX_free(pctx);
3192 return (-1);
3193 }
3194
3195 /*
3196 * Check a certificate can be used for client authentication. Currently check
3197 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
3198 * certificates can be used and optionally checks suitability for Suite B.
3199 */
3200 static int ssl3_check_client_certificate(SSL *s)
3201 {
3202 unsigned long alg_k;
3203 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3204 return 0;
3205 /* If no suitable signature algorithm can't use certificate */
3206 if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3207 return 0;
3208 /*
3209 * If strict mode check suitability of chain before using it. This also
3210 * adjusts suite B digest if necessary.
3211 */
3212 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3213 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3214 return 0;
3215 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3216 /* See if we can use client certificate for fixed DH */
3217 if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3218 SESS_CERT *scert = s->session->sess_cert;
3219 int i = scert->peer_cert_type;
3220 EVP_PKEY *clkey = NULL, *spkey = NULL;
3221 clkey = s->cert->key->privatekey;
3222 /* If client key not DH assume it can be used */
3223 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3224 return 1;
3225 if (i >= 0)
3226 spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3227 if (spkey) {
3228 /* Compare server and client parameters */
3229 i = EVP_PKEY_cmp_parameters(clkey, spkey);
3230 EVP_PKEY_free(spkey);
3231 if (i != 1)
3232 return 0;
3233 }
3234 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3235 }
3236 return 1;
3237 }
3238
3239 int ssl3_send_client_certificate(SSL *s)
3240 {
3241 X509 *x509 = NULL;
3242 EVP_PKEY *pkey = NULL;
3243 int i;
3244
3245 if (s->state == SSL3_ST_CW_CERT_A) {
3246 /* Let cert callback update client certificates if required */
3247 if (s->cert->cert_cb) {
3248 i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3249 if (i < 0) {
3250 s->rwstate = SSL_X509_LOOKUP;
3251 return -1;
3252 }
3253 if (i == 0) {
3254 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3255 return 0;
3256 }
3257 s->rwstate = SSL_NOTHING;
3258 }
3259 if (ssl3_check_client_certificate(s))
3260 s->state = SSL3_ST_CW_CERT_C;
3261 else
3262 s->state = SSL3_ST_CW_CERT_B;
3263 }
3264
3265 /* We need to get a client cert */
3266 if (s->state == SSL3_ST_CW_CERT_B) {
3267 /*
3268 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3269 * return(-1); We then get retied later
3270 */
3271 i = 0;
3272 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3273 if (i < 0) {
3274 s->rwstate = SSL_X509_LOOKUP;
3275 return (-1);
3276 }
3277 s->rwstate = SSL_NOTHING;
3278 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3279 s->state = SSL3_ST_CW_CERT_B;
3280 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3281 i = 0;
3282 } else if (i == 1) {
3283 i = 0;
3284 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
3285 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3286 }
3287
3288 if (x509 != NULL)
3289 X509_free(x509);
3290 if (pkey != NULL)
3291 EVP_PKEY_free(pkey);
3292 if (i && !ssl3_check_client_certificate(s))
3293 i = 0;
3294 if (i == 0) {
3295 if (s->version == SSL3_VERSION) {
3296 s->s3->tmp.cert_req = 0;
3297 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3298 return (1);
3299 } else {
3300 s->s3->tmp.cert_req = 2;
3301 }
3302 }
3303
3304 /* Ok, we have a cert */
3305 s->state = SSL3_ST_CW_CERT_C;
3306 }
3307
3308 if (s->state == SSL3_ST_CW_CERT_C) {
3309 s->state = SSL3_ST_CW_CERT_D;
3310 if (!ssl3_output_cert_chain(s,
3311 (s->s3->tmp.cert_req ==
3312 2) ? NULL : s->cert->key)) {
3313 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3314 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3315 return 0;
3316 }
3317 }
3318 /* SSL3_ST_CW_CERT_D */
3319 return ssl_do_write(s);
3320 }
3321
3322 #define has_bits(i,m) (((i)&(m)) == (m))
3323
3324 int ssl3_check_cert_and_algorithm(SSL *s)
3325 {
3326 int i, idx;
3327 long alg_k, alg_a;
3328 EVP_PKEY *pkey = NULL;
3329 SESS_CERT *sc;
3330 #ifndef OPENSSL_NO_RSA
3331 RSA *rsa;
3332 #endif
3333 #ifndef OPENSSL_NO_DH
3334 DH *dh;
3335 #endif
3336
3337 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3338 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3339
3340 /* we don't have a certificate */
3341 if ((alg_a & (SSL_aNULL | SSL_aKRB5)) || (alg_k & SSL_kPSK))
3342 return (1);
3343
3344 sc = s->session->sess_cert;
3345 if (sc == NULL) {
3346 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3347 goto err;
3348 }
3349 #ifndef OPENSSL_NO_RSA
3350 rsa = s->session->sess_cert->peer_rsa_tmp;
3351 #endif
3352 #ifndef OPENSSL_NO_DH
3353 dh = s->session->sess_cert->peer_dh_tmp;
3354 #endif
3355
3356 /* This is the passed certificate */
3357
3358 idx = sc->peer_cert_type;
3359 #ifndef OPENSSL_NO_ECDH
3360 if (idx == SSL_PKEY_ECC) {
3361 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) {
3362 /* check failed */
3363 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
3364 goto f_err;
3365 } else {
3366 return 1;
3367 }
3368 } else if (alg_a & SSL_aECDSA) {
3369 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3370 SSL_R_MISSING_ECDSA_SIGNING_CERT);
3371 goto f_err;
3372 } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
3373 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT);
3374 goto f_err;
3375 }
3376 #endif
3377 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
3378 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
3379 EVP_PKEY_free(pkey);
3380
3381 /* Check that we have a certificate if we require one */
3382 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
3383 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3384 SSL_R_MISSING_RSA_SIGNING_CERT);
3385 goto f_err;
3386 }
3387 #ifndef OPENSSL_NO_DSA
3388 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
3389 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3390 SSL_R_MISSING_DSA_SIGNING_CERT);
3391 goto f_err;
3392 }
3393 #endif
3394 #ifndef OPENSSL_NO_RSA
3395 if ((alg_k & SSL_kRSA) &&
3396 !(has_bits(i, EVP_PK_RSA | EVP_PKT_ENC) || (rsa != NULL))) {
3397 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3398 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3399 goto f_err;
3400 }
3401 #endif
3402 #ifndef OPENSSL_NO_DH
3403 if ((alg_k & SSL_kEDH) &&
3404 !(has_bits(i, EVP_PK_DH | EVP_PKT_EXCH) || (dh != NULL))) {
3405 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_KEY);
3406 goto f_err;
3407 } else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3408 !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
3409 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3410 SSL_R_MISSING_DH_RSA_CERT);
3411 goto f_err;
3412 }
3413 # ifndef OPENSSL_NO_DSA
3414 else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3415 !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
3416 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3417 SSL_R_MISSING_DH_DSA_CERT);
3418 goto f_err;
3419 }
3420 # endif
3421 #endif
3422
3423 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i, EVP_PKT_EXP)) {
3424 #ifndef OPENSSL_NO_RSA
3425 if (alg_k & SSL_kRSA) {
3426 if (rsa == NULL
3427 || RSA_size(rsa) * 8 >
3428 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3429 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3430 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3431 goto f_err;
3432 }
3433 } else
3434 #endif
3435 #ifndef OPENSSL_NO_DH
3436 if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
3437 if (dh == NULL
3438 || DH_size(dh) * 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_DH_KEY);
3442 goto f_err;
3443 }
3444 } else
3445 #endif
3446 {
3447 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3448 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3449 goto f_err;
3450 }
3451 }
3452 return (1);
3453 f_err:
3454 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3455 err:
3456 return (0);
3457 }
3458
3459 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3460 int ssl3_send_next_proto(SSL *s)
3461 {
3462 unsigned int len, padding_len;
3463 unsigned char *d;
3464
3465 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) {
3466 len = s->next_proto_negotiated_len;
3467 padding_len = 32 - ((len + 2) % 32);
3468 d = (unsigned char *)s->init_buf->data;
3469 d[4] = len;
3470 memcpy(d + 5, s->next_proto_negotiated, len);
3471 d[5 + len] = padding_len;
3472 memset(d + 6 + len, 0, padding_len);
3473 *(d++) = SSL3_MT_NEXT_PROTO;
3474 l2n3(2 + len + padding_len, d);
3475 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3476 s->init_num = 4 + 2 + len + padding_len;
3477 s->init_off = 0;
3478 }
3479
3480 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3481 }
3482 #endif /* !OPENSSL_NO_TLSEXT &&
3483 * !OPENSSL_NO_NEXTPROTONEG */
3484
3485 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3486 {
3487 int i = 0;
3488 #ifndef OPENSSL_NO_ENGINE
3489 if (s->ctx->client_cert_engine) {
3490 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3491 SSL_get_client_CA_list(s),
3492 px509, ppkey, NULL, NULL, NULL);
3493 if (i != 0)
3494 return i;
3495 }
3496 #endif
3497 if (s->ctx->client_cert_cb)
3498 i = s->ctx->client_cert_cb(s, px509, ppkey);
3499 return i;
3500 }
Tomato firmware and modifications.