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[thirdparty/openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124 /* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "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 #ifndef OPENSSL_NO_DH
160 # include <openssl/dh.h>
161 #endif
162 #include <openssl/bn.h>
163 #ifndef OPENSSL_NO_ENGINE
164 # include <openssl/engine.h>
165 #endif
166
167 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
168 #ifndef OPENSSL_NO_TLSEXT
169 static int ssl3_check_finished(SSL *s);
170 #endif
171
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 if (!SSL_clear(s))
205 return -1;
206 }
207
208 #ifndef OPENSSL_NO_HEARTBEATS
209 /*
210 * If we're awaiting a HeartbeatResponse, pretend we already got and
211 * don't await it anymore, because Heartbeats don't make sense during
212 * handshakes anyway.
213 */
214 if (s->tlsext_hb_pending) {
215 s->tlsext_hb_pending = 0;
216 s->tlsext_hb_seq++;
217 }
218 #endif
219
220 for (;;) {
221 state = s->state;
222
223 switch (s->state) {
224 case SSL_ST_RENEGOTIATE:
225 s->renegotiate = 1;
226 s->state = SSL_ST_CONNECT;
227 s->ctx->stats.sess_connect_renegotiate++;
228 /* break */
229 case SSL_ST_BEFORE:
230 case SSL_ST_CONNECT:
231 case SSL_ST_BEFORE | SSL_ST_CONNECT:
232 case SSL_ST_OK | SSL_ST_CONNECT:
233
234 s->server = 0;
235 if (cb != NULL)
236 cb(s, SSL_CB_HANDSHAKE_START, 1);
237
238 if ((s->version & 0xff00) != 0x0300) {
239 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
240 ret = -1;
241 goto end;
242 }
243
244 if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
245 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
246 return -1;
247 }
248
249 /* s->version=SSL3_VERSION; */
250 s->type = SSL_ST_CONNECT;
251
252 if (s->init_buf == NULL) {
253 if ((buf = BUF_MEM_new()) == NULL) {
254 ret = -1;
255 goto end;
256 }
257 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
258 ret = -1;
259 goto end;
260 }
261 s->init_buf = buf;
262 buf = NULL;
263 }
264
265 if (!ssl3_setup_buffers(s)) {
266 ret = -1;
267 goto end;
268 }
269
270 /* setup buffing BIO */
271 if (!ssl_init_wbio_buffer(s, 0)) {
272 ret = -1;
273 goto end;
274 }
275
276 /* don't push the buffering BIO quite yet */
277
278 ssl3_init_finished_mac(s);
279
280 s->state = SSL3_ST_CW_CLNT_HELLO_A;
281 s->ctx->stats.sess_connect++;
282 s->init_num = 0;
283 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
284 /*
285 * Should have been reset by ssl3_get_finished, too.
286 */
287 s->s3->change_cipher_spec = 0;
288 break;
289
290 case SSL3_ST_CW_CLNT_HELLO_A:
291 case SSL3_ST_CW_CLNT_HELLO_B:
292
293 s->shutdown = 0;
294 ret = ssl3_client_hello(s);
295 if (ret <= 0)
296 goto end;
297 s->state = SSL3_ST_CR_SRVR_HELLO_A;
298 s->init_num = 0;
299
300 /* turn on buffering for the next lot of output */
301 if (s->bbio != s->wbio)
302 s->wbio = BIO_push(s->bbio, s->wbio);
303
304 break;
305
306 case SSL3_ST_CR_SRVR_HELLO_A:
307 case SSL3_ST_CR_SRVR_HELLO_B:
308 ret = ssl3_get_server_hello(s);
309 if (ret <= 0)
310 goto end;
311
312 if (s->hit) {
313 s->state = SSL3_ST_CR_FINISHED_A;
314 #ifndef OPENSSL_NO_TLSEXT
315 if (s->tlsext_ticket_expected) {
316 /* receive renewed session ticket */
317 s->state = SSL3_ST_CR_SESSION_TICKET_A;
318 }
319 #endif
320 } else {
321 s->state = SSL3_ST_CR_CERT_A;
322 }
323 s->init_num = 0;
324 break;
325 case SSL3_ST_CR_CERT_A:
326 case SSL3_ST_CR_CERT_B:
327 #ifndef OPENSSL_NO_TLSEXT
328 /* Noop (ret = 0) for everything but EAP-FAST. */
329 ret = ssl3_check_finished(s);
330 if (ret < 0)
331 goto end;
332 if (ret == 1) {
333 s->hit = 1;
334 s->state = SSL3_ST_CR_FINISHED_A;
335 s->init_num = 0;
336 break;
337 }
338 #endif
339 /* Check if it is anon DH/ECDH, SRP auth */
340 /* or PSK */
341 if (!
342 (s->s3->tmp.
343 new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
344 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
345 ret = ssl3_get_server_certificate(s);
346 if (ret <= 0)
347 goto end;
348 #ifndef OPENSSL_NO_TLSEXT
349 if (s->tlsext_status_expected)
350 s->state = SSL3_ST_CR_CERT_STATUS_A;
351 else
352 s->state = SSL3_ST_CR_KEY_EXCH_A;
353 } else {
354 skip = 1;
355 s->state = SSL3_ST_CR_KEY_EXCH_A;
356 }
357 #else
358 } else
359 skip = 1;
360
361 s->state = SSL3_ST_CR_KEY_EXCH_A;
362 #endif
363 s->init_num = 0;
364 break;
365
366 case SSL3_ST_CR_KEY_EXCH_A:
367 case SSL3_ST_CR_KEY_EXCH_B:
368 ret = ssl3_get_key_exchange(s);
369 if (ret <= 0)
370 goto end;
371 s->state = SSL3_ST_CR_CERT_REQ_A;
372 s->init_num = 0;
373
374 /*
375 * at this point we check that we have the required stuff from
376 * the server
377 */
378 if (!ssl3_check_cert_and_algorithm(s)) {
379 ret = -1;
380 goto end;
381 }
382 break;
383
384 case SSL3_ST_CR_CERT_REQ_A:
385 case SSL3_ST_CR_CERT_REQ_B:
386 ret = ssl3_get_certificate_request(s);
387 if (ret <= 0)
388 goto end;
389 s->state = SSL3_ST_CR_SRVR_DONE_A;
390 s->init_num = 0;
391 break;
392
393 case SSL3_ST_CR_SRVR_DONE_A:
394 case SSL3_ST_CR_SRVR_DONE_B:
395 ret = ssl3_get_server_done(s);
396 if (ret <= 0)
397 goto end;
398 #ifndef OPENSSL_NO_SRP
399 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
400 if ((ret = SRP_Calc_A_param(s)) <= 0) {
401 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC);
402 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
403 goto end;
404 }
405 }
406 #endif
407 if (s->s3->tmp.cert_req)
408 s->state = SSL3_ST_CW_CERT_A;
409 else
410 s->state = SSL3_ST_CW_KEY_EXCH_A;
411 s->init_num = 0;
412
413 break;
414
415 case SSL3_ST_CW_CERT_A:
416 case SSL3_ST_CW_CERT_B:
417 case SSL3_ST_CW_CERT_C:
418 case SSL3_ST_CW_CERT_D:
419 ret = ssl3_send_client_certificate(s);
420 if (ret <= 0)
421 goto end;
422 s->state = SSL3_ST_CW_KEY_EXCH_A;
423 s->init_num = 0;
424 break;
425
426 case SSL3_ST_CW_KEY_EXCH_A:
427 case SSL3_ST_CW_KEY_EXCH_B:
428 ret = ssl3_send_client_key_exchange(s);
429 if (ret <= 0)
430 goto end;
431 /*
432 * EAY EAY EAY need to check for DH fix cert sent back
433 */
434 /*
435 * For TLS, cert_req is set to 2, so a cert chain of nothing is
436 * sent, but no verify packet is sent
437 */
438 /*
439 * XXX: For now, we do not support client authentication in ECDH
440 * cipher suites with ECDH (rather than ECDSA) certificates. We
441 * need to skip the certificate verify message when client's
442 * ECDH public key is sent inside the client certificate.
443 */
444 if (s->s3->tmp.cert_req == 1) {
445 s->state = SSL3_ST_CW_CERT_VRFY_A;
446 } else {
447 s->state = SSL3_ST_CW_CHANGE_A;
448 }
449 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
450 s->state = SSL3_ST_CW_CHANGE_A;
451 }
452
453 s->init_num = 0;
454 break;
455
456 case SSL3_ST_CW_CERT_VRFY_A:
457 case SSL3_ST_CW_CERT_VRFY_B:
458 ret = ssl3_send_client_verify(s);
459 if (ret <= 0)
460 goto end;
461 s->state = SSL3_ST_CW_CHANGE_A;
462 s->init_num = 0;
463 break;
464
465 case SSL3_ST_CW_CHANGE_A:
466 case SSL3_ST_CW_CHANGE_B:
467 ret = ssl3_send_change_cipher_spec(s,
468 SSL3_ST_CW_CHANGE_A,
469 SSL3_ST_CW_CHANGE_B);
470 if (ret <= 0)
471 goto end;
472
473 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
474 s->state = SSL3_ST_CW_FINISHED_A;
475 #else
476 if (s->s3->next_proto_neg_seen)
477 s->state = SSL3_ST_CW_NEXT_PROTO_A;
478 else
479 s->state = SSL3_ST_CW_FINISHED_A;
480 #endif
481 s->init_num = 0;
482
483 s->session->cipher = s->s3->tmp.new_cipher;
484 #ifdef OPENSSL_NO_COMP
485 s->session->compress_meth = 0;
486 #else
487 if (s->s3->tmp.new_compression == NULL)
488 s->session->compress_meth = 0;
489 else
490 s->session->compress_meth = s->s3->tmp.new_compression->id;
491 #endif
492 if (!s->method->ssl3_enc->setup_key_block(s)) {
493 ret = -1;
494 goto end;
495 }
496
497 if (!s->method->ssl3_enc->change_cipher_state(s,
498 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
499 {
500 ret = -1;
501 goto end;
502 }
503
504 break;
505
506 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
507 case SSL3_ST_CW_NEXT_PROTO_A:
508 case SSL3_ST_CW_NEXT_PROTO_B:
509 ret = ssl3_send_next_proto(s);
510 if (ret <= 0)
511 goto end;
512 s->state = SSL3_ST_CW_FINISHED_A;
513 break;
514 #endif
515
516 case SSL3_ST_CW_FINISHED_A:
517 case SSL3_ST_CW_FINISHED_B:
518 ret = ssl3_send_finished(s,
519 SSL3_ST_CW_FINISHED_A,
520 SSL3_ST_CW_FINISHED_B,
521 s->method->
522 ssl3_enc->client_finished_label,
523 s->method->
524 ssl3_enc->client_finished_label_len);
525 if (ret <= 0)
526 goto end;
527 s->state = SSL3_ST_CW_FLUSH;
528
529 /* clear flags */
530 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
531 if (s->hit) {
532 s->s3->tmp.next_state = SSL_ST_OK;
533 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
534 s->state = SSL_ST_OK;
535 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
536 s->s3->delay_buf_pop_ret = 0;
537 }
538 } else {
539 #ifndef OPENSSL_NO_TLSEXT
540 /*
541 * Allow NewSessionTicket if ticket expected
542 */
543 if (s->tlsext_ticket_expected)
544 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
545 else
546 #endif
547
548 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
549 }
550 s->init_num = 0;
551 break;
552
553 #ifndef OPENSSL_NO_TLSEXT
554 case SSL3_ST_CR_SESSION_TICKET_A:
555 case SSL3_ST_CR_SESSION_TICKET_B:
556 ret = ssl3_get_new_session_ticket(s);
557 if (ret <= 0)
558 goto end;
559 s->state = SSL3_ST_CR_FINISHED_A;
560 s->init_num = 0;
561 break;
562
563 case SSL3_ST_CR_CERT_STATUS_A:
564 case SSL3_ST_CR_CERT_STATUS_B:
565 ret = ssl3_get_cert_status(s);
566 if (ret <= 0)
567 goto end;
568 s->state = SSL3_ST_CR_KEY_EXCH_A;
569 s->init_num = 0;
570 break;
571 #endif
572
573 case SSL3_ST_CR_FINISHED_A:
574 case SSL3_ST_CR_FINISHED_B:
575 if (!s->s3->change_cipher_spec)
576 s->s3->flags |= SSL3_FLAGS_CCS_OK;
577 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
578 SSL3_ST_CR_FINISHED_B);
579 if (ret <= 0)
580 goto end;
581
582 if (s->hit)
583 s->state = SSL3_ST_CW_CHANGE_A;
584 else
585 s->state = SSL_ST_OK;
586 s->init_num = 0;
587 break;
588
589 case SSL3_ST_CW_FLUSH:
590 s->rwstate = SSL_WRITING;
591 if (BIO_flush(s->wbio) <= 0) {
592 ret = -1;
593 goto end;
594 }
595 s->rwstate = SSL_NOTHING;
596 s->state = s->s3->tmp.next_state;
597 break;
598
599 case SSL_ST_OK:
600 /* clean a few things up */
601 ssl3_cleanup_key_block(s);
602
603 if (s->init_buf != NULL) {
604 BUF_MEM_free(s->init_buf);
605 s->init_buf = NULL;
606 }
607
608 /*
609 * If we are not 'joining' the last two packets, remove the
610 * buffering now
611 */
612 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
613 ssl_free_wbio_buffer(s);
614 /* else do it later in ssl3_write */
615
616 s->init_num = 0;
617 s->renegotiate = 0;
618 s->new_session = 0;
619
620 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
621 if (s->hit)
622 s->ctx->stats.sess_hit++;
623
624 ret = 1;
625 /* s->server=0; */
626 s->handshake_func = ssl3_connect;
627 s->ctx->stats.sess_connect_good++;
628
629 if (cb != NULL)
630 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
631
632 goto end;
633 /* break; */
634
635 default:
636 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
637 ret = -1;
638 goto end;
639 /* break; */
640 }
641
642 /* did we do anything */
643 if (!s->s3->tmp.reuse_message && !skip) {
644 if (s->debug) {
645 if ((ret = BIO_flush(s->wbio)) <= 0)
646 goto end;
647 }
648
649 if ((cb != NULL) && (s->state != state)) {
650 new_state = s->state;
651 s->state = state;
652 cb(s, SSL_CB_CONNECT_LOOP, 1);
653 s->state = new_state;
654 }
655 }
656 skip = 0;
657 }
658 end:
659 s->in_handshake--;
660 if (buf != NULL)
661 BUF_MEM_free(buf);
662 if (cb != NULL)
663 cb(s, SSL_CB_CONNECT_EXIT, ret);
664 return (ret);
665 }
666
667 int ssl3_client_hello(SSL *s)
668 {
669 unsigned char *buf;
670 unsigned char *p, *d;
671 int i;
672 unsigned long l;
673 int al = 0;
674 #ifndef OPENSSL_NO_COMP
675 int j;
676 SSL_COMP *comp;
677 #endif
678
679 buf = (unsigned char *)s->init_buf->data;
680 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
681 SSL_SESSION *sess = s->session;
682 if ((sess == NULL) || (sess->ssl_version != s->version) ||
683 #ifdef OPENSSL_NO_TLSEXT
684 !sess->session_id_length ||
685 #else
686 /*
687 * In the case of EAP-FAST, we can have a pre-shared
688 * "ticket" without a session ID.
689 */
690 (!sess->session_id_length && !sess->tlsext_tick) ||
691 #endif
692 (sess->not_resumable)) {
693 if (!ssl_get_new_session(s, 0))
694 goto err;
695 }
696 if (s->method->version == DTLS_ANY_VERSION) {
697 /* Determine which DTLS version to use */
698 int options = s->options;
699 /* If DTLS 1.2 disabled correct the version number */
700 if (options & SSL_OP_NO_DTLSv1_2) {
701 if (tls1_suiteb(s)) {
702 SSLerr(SSL_F_SSL3_CLIENT_HELLO,
703 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
704 goto err;
705 }
706 /*
707 * Disabling all versions is silly: return an error.
708 */
709 if (options & SSL_OP_NO_DTLSv1) {
710 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_WRONG_SSL_VERSION);
711 goto err;
712 }
713 /*
714 * Update method so we don't use any DTLS 1.2 features.
715 */
716 s->method = DTLSv1_client_method();
717 s->version = DTLS1_VERSION;
718 } else {
719 /*
720 * We only support one version: update method
721 */
722 if (options & SSL_OP_NO_DTLSv1)
723 s->method = DTLSv1_2_client_method();
724 s->version = DTLS1_2_VERSION;
725 }
726 s->client_version = s->version;
727 }
728 /* else use the pre-loaded session */
729
730 p = s->s3->client_random;
731
732 /*
733 * for DTLS if client_random is initialized, reuse it, we are
734 * required to use same upon reply to HelloVerify
735 */
736 if (SSL_IS_DTLS(s)) {
737 size_t idx;
738 i = 1;
739 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
740 if (p[idx]) {
741 i = 0;
742 break;
743 }
744 }
745 } else
746 i = 1;
747
748 if (i && ssl_fill_hello_random(s, 0, p,
749 sizeof(s->s3->client_random)) <= 0)
750 goto err;
751
752 /* Do the message type and length last */
753 d = p = ssl_handshake_start(s);
754
755 /*-
756 * version indicates the negotiated version: for example from
757 * an SSLv2/v3 compatible client hello). The client_version
758 * field is the maximum version we permit and it is also
759 * used in RSA encrypted premaster secrets. Some servers can
760 * choke if we initially report a higher version then
761 * renegotiate to a lower one in the premaster secret. This
762 * didn't happen with TLS 1.0 as most servers supported it
763 * but it can with TLS 1.1 or later if the server only supports
764 * 1.0.
765 *
766 * Possible scenario with previous logic:
767 * 1. Client hello indicates TLS 1.2
768 * 2. Server hello says TLS 1.0
769 * 3. RSA encrypted premaster secret uses 1.2.
770 * 4. Handhaked proceeds using TLS 1.0.
771 * 5. Server sends hello request to renegotiate.
772 * 6. Client hello indicates TLS v1.0 as we now
773 * know that is maximum server supports.
774 * 7. Server chokes on RSA encrypted premaster secret
775 * containing version 1.0.
776 *
777 * For interoperability it should be OK to always use the
778 * maximum version we support in client hello and then rely
779 * on the checking of version to ensure the servers isn't
780 * being inconsistent: for example initially negotiating with
781 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
782 * client_version in client hello and not resetting it to
783 * the negotiated version.
784 */
785 *(p++) = s->client_version >> 8;
786 *(p++) = s->client_version & 0xff;
787
788 /* Random stuff */
789 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
790 p += SSL3_RANDOM_SIZE;
791
792 /* Session ID */
793 if (s->new_session)
794 i = 0;
795 else
796 i = s->session->session_id_length;
797 *(p++) = i;
798 if (i != 0) {
799 if (i > (int)sizeof(s->session->session_id)) {
800 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
801 goto err;
802 }
803 memcpy(p, s->session->session_id, i);
804 p += i;
805 }
806
807 /* cookie stuff for DTLS */
808 if (SSL_IS_DTLS(s)) {
809 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
810 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
811 goto err;
812 }
813 *(p++) = s->d1->cookie_len;
814 memcpy(p, s->d1->cookie, s->d1->cookie_len);
815 p += s->d1->cookie_len;
816 }
817
818 /* Ciphers supported */
819 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
820 if (i == 0) {
821 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
822 goto err;
823 }
824 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
825 /*
826 * Some servers hang if client hello > 256 bytes as hack workaround
827 * chop number of supported ciphers to keep it well below this if we
828 * use TLS v1.2
829 */
830 if (TLS1_get_version(s) >= TLS1_2_VERSION
831 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
832 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
833 #endif
834 s2n(i, p);
835 p += i;
836
837 /* COMPRESSION */
838 #ifdef OPENSSL_NO_COMP
839 *(p++) = 1;
840 #else
841
842 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
843 j = 0;
844 else
845 j = sk_SSL_COMP_num(s->ctx->comp_methods);
846 *(p++) = 1 + j;
847 for (i = 0; i < j; i++) {
848 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
849 *(p++) = comp->id;
850 }
851 #endif
852 *(p++) = 0; /* Add the NULL method */
853
854 #ifndef OPENSSL_NO_TLSEXT
855 /* TLS extensions */
856 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
857 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
858 goto err;
859 }
860 if ((p =
861 ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
862 &al)) == NULL) {
863 ssl3_send_alert(s, SSL3_AL_FATAL, al);
864 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
865 goto err;
866 }
867 #endif
868
869 l = p - d;
870 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l)) {
871 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
872 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
873 goto err;
874 }
875 s->state = SSL3_ST_CW_CLNT_HELLO_B;
876 }
877
878 /* SSL3_ST_CW_CLNT_HELLO_B */
879 return ssl_do_write(s);
880 err:
881 return (-1);
882 }
883
884 int ssl3_get_server_hello(SSL *s)
885 {
886 STACK_OF(SSL_CIPHER) *sk;
887 const SSL_CIPHER *c;
888 CERT *ct = s->cert;
889 unsigned char *p, *d;
890 int i, al = SSL_AD_INTERNAL_ERROR, ok;
891 unsigned int j;
892 long n;
893 #ifndef OPENSSL_NO_COMP
894 SSL_COMP *comp;
895 #endif
896 /*
897 * Hello verify request and/or server hello version may not match so set
898 * first packet if we're negotiating version.
899 */
900 if (SSL_IS_DTLS(s))
901 s->first_packet = 1;
902
903 n = s->method->ssl_get_message(s,
904 SSL3_ST_CR_SRVR_HELLO_A,
905 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
906
907 if (!ok)
908 return ((int)n);
909
910 if (SSL_IS_DTLS(s)) {
911 s->first_packet = 0;
912 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
913 if (s->d1->send_cookie == 0) {
914 s->s3->tmp.reuse_message = 1;
915 return 1;
916 } else { /* already sent a cookie */
917
918 al = SSL_AD_UNEXPECTED_MESSAGE;
919 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
920 goto f_err;
921 }
922 }
923 }
924
925 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
926 al = SSL_AD_UNEXPECTED_MESSAGE;
927 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
928 goto f_err;
929 }
930
931 d = p = (unsigned char *)s->init_msg;
932 if (s->method->version == DTLS_ANY_VERSION) {
933 /* Work out correct protocol version to use */
934 int hversion = (p[0] << 8) | p[1];
935 int options = s->options;
936 if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2))
937 s->method = DTLSv1_2_client_method();
938 else if (tls1_suiteb(s)) {
939 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
940 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
941 s->version = hversion;
942 al = SSL_AD_PROTOCOL_VERSION;
943 goto f_err;
944 } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1))
945 s->method = DTLSv1_client_method();
946 else {
947 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
948 s->version = hversion;
949 al = SSL_AD_PROTOCOL_VERSION;
950 goto f_err;
951 }
952 s->version = s->method->version;
953 }
954
955 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
956 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
957 s->version = (s->version & 0xff00) | p[1];
958 al = SSL_AD_PROTOCOL_VERSION;
959 goto f_err;
960 }
961 p += 2;
962
963 /* load the server hello data */
964 /* load the server random */
965 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
966 p += SSL3_RANDOM_SIZE;
967
968 s->hit = 0;
969
970 /* get the session-id */
971 j = *(p++);
972
973 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
974 al = SSL_AD_ILLEGAL_PARAMETER;
975 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
976 goto f_err;
977 }
978 #ifndef OPENSSL_NO_TLSEXT
979 /*
980 * Check if we can resume the session based on external pre-shared secret.
981 * EAP-FAST (RFC 4851) supports two types of session resumption.
982 * Resumption based on server-side state works with session IDs.
983 * Resumption based on pre-shared Protected Access Credentials (PACs)
984 * works by overriding the SessionTicket extension at the application
985 * layer, and does not send a session ID. (We do not know whether EAP-FAST
986 * servers would honour the session ID.) Therefore, the session ID alone
987 * is not a reliable indicator of session resumption, so we first check if
988 * we can resume, and later peek at the next handshake message to see if the
989 * server wants to resume.
990 */
991 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb &&
992 s->session->tlsext_tick) {
993 SSL_CIPHER *pref_cipher = NULL;
994 s->session->master_key_length = sizeof(s->session->master_key);
995 if (s->tls_session_secret_cb(s, s->session->master_key,
996 &s->session->master_key_length,
997 NULL, &pref_cipher,
998 s->tls_session_secret_cb_arg)) {
999 s->session->cipher = pref_cipher ?
1000 pref_cipher : ssl_get_cipher_by_char(s, p + j);
1001 } else {
1002 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1003 al = SSL_AD_INTERNAL_ERROR;
1004 goto f_err;
1005 }
1006 }
1007 #endif /* OPENSSL_NO_TLSEXT */
1008
1009 if (j != 0 && j == s->session->session_id_length
1010 && memcmp(p, s->session->session_id, j) == 0) {
1011 if (s->sid_ctx_length != s->session->sid_ctx_length
1012 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
1013 /* actually a client application bug */
1014 al = SSL_AD_ILLEGAL_PARAMETER;
1015 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1016 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1017 goto f_err;
1018 }
1019 s->hit = 1;
1020 } else {
1021 /*
1022 * If we were trying for session-id reuse but the server
1023 * didn't echo the ID, make a new SSL_SESSION.
1024 * In the case of EAP-FAST and PAC, we do not send a session ID,
1025 * so the PAC-based session secret is always preserved. It'll be
1026 * overwritten if the server refuses resumption.
1027 */
1028 if (s->session->session_id_length > 0) {
1029 if (!ssl_get_new_session(s, 0)) {
1030 goto f_err;
1031 }
1032 }
1033 s->session->session_id_length = j;
1034 memcpy(s->session->session_id, p, j); /* j could be 0 */
1035 }
1036 p += j;
1037 c = ssl_get_cipher_by_char(s, p);
1038 if (c == NULL) {
1039 /* unknown cipher */
1040 al = SSL_AD_ILLEGAL_PARAMETER;
1041 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
1042 goto f_err;
1043 }
1044 /* Set version disabled mask now we know version */
1045 if (!SSL_USE_TLS1_2_CIPHERS(s))
1046 ct->mask_ssl = SSL_TLSV1_2;
1047 else
1048 ct->mask_ssl = 0;
1049 /*
1050 * If it is a disabled cipher we didn't send it in client hello, so
1051 * return an error.
1052 */
1053 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) {
1054 al = SSL_AD_ILLEGAL_PARAMETER;
1055 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1056 goto f_err;
1057 }
1058 p += ssl_put_cipher_by_char(s, NULL, NULL);
1059
1060 sk = ssl_get_ciphers_by_id(s);
1061 i = sk_SSL_CIPHER_find(sk, c);
1062 if (i < 0) {
1063 /* we did not say we would use this cipher */
1064 al = SSL_AD_ILLEGAL_PARAMETER;
1065 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1066 goto f_err;
1067 }
1068
1069 /*
1070 * Depending on the session caching (internal/external), the cipher
1071 * and/or cipher_id values may not be set. Make sure that cipher_id is
1072 * set and use it for comparison.
1073 */
1074 if (s->session->cipher)
1075 s->session->cipher_id = s->session->cipher->id;
1076 if (s->hit && (s->session->cipher_id != c->id)) {
1077 al = SSL_AD_ILLEGAL_PARAMETER;
1078 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1079 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1080 goto f_err;
1081 }
1082 s->s3->tmp.new_cipher = c;
1083 /*
1084 * Don't digest cached records if no sigalgs: we may need them for client
1085 * authentication.
1086 */
1087 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1088 goto f_err;
1089 /* lets get the compression algorithm */
1090 /* COMPRESSION */
1091 #ifdef OPENSSL_NO_COMP
1092 if (*(p++) != 0) {
1093 al = SSL_AD_ILLEGAL_PARAMETER;
1094 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1095 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1096 goto f_err;
1097 }
1098 /*
1099 * If compression is disabled we'd better not try to resume a session
1100 * using compression.
1101 */
1102 if (s->session->compress_meth != 0) {
1103 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1104 goto f_err;
1105 }
1106 #else
1107 j = *(p++);
1108 if (s->hit && j != s->session->compress_meth) {
1109 al = SSL_AD_ILLEGAL_PARAMETER;
1110 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1111 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1112 goto f_err;
1113 }
1114 if (j == 0)
1115 comp = NULL;
1116 else if (!ssl_allow_compression(s)) {
1117 al = SSL_AD_ILLEGAL_PARAMETER;
1118 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
1119 goto f_err;
1120 } else
1121 comp = ssl3_comp_find(s->ctx->comp_methods, j);
1122
1123 if ((j != 0) && (comp == NULL)) {
1124 al = SSL_AD_ILLEGAL_PARAMETER;
1125 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1126 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1127 goto f_err;
1128 } else {
1129 s->s3->tmp.new_compression = comp;
1130 }
1131 #endif
1132
1133 #ifndef OPENSSL_NO_TLSEXT
1134 /* TLS extensions */
1135 if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) {
1136 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
1137 goto err;
1138 }
1139 #endif
1140
1141 if (p != (d + n)) {
1142 /* wrong packet length */
1143 al = SSL_AD_DECODE_ERROR;
1144 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
1145 goto f_err;
1146 }
1147
1148 return (1);
1149 f_err:
1150 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1151 err:
1152 return (-1);
1153 }
1154
1155 int ssl3_get_server_certificate(SSL *s)
1156 {
1157 int al, i, ok, ret = -1;
1158 unsigned long n, nc, llen, l;
1159 X509 *x = NULL;
1160 const unsigned char *q, *p;
1161 unsigned char *d;
1162 STACK_OF(X509) *sk = NULL;
1163 SESS_CERT *sc;
1164 EVP_PKEY *pkey = NULL;
1165 int need_cert = 1; /* VRS: 0=> will allow null cert if auth ==
1166 * KRB5 */
1167
1168 n = s->method->ssl_get_message(s,
1169 SSL3_ST_CR_CERT_A,
1170 SSL3_ST_CR_CERT_B,
1171 -1, s->max_cert_list, &ok);
1172
1173 if (!ok)
1174 return ((int)n);
1175
1176 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1177 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1178 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) {
1179 s->s3->tmp.reuse_message = 1;
1180 return (1);
1181 }
1182
1183 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1184 al = SSL_AD_UNEXPECTED_MESSAGE;
1185 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
1186 goto f_err;
1187 }
1188 p = d = (unsigned char *)s->init_msg;
1189
1190 if ((sk = sk_X509_new_null()) == NULL) {
1191 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1192 goto err;
1193 }
1194
1195 n2l3(p, llen);
1196 if (llen + 3 != n) {
1197 al = SSL_AD_DECODE_ERROR;
1198 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
1199 goto f_err;
1200 }
1201 for (nc = 0; nc < llen;) {
1202 n2l3(p, l);
1203 if ((l + nc + 3) > llen) {
1204 al = SSL_AD_DECODE_ERROR;
1205 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1206 SSL_R_CERT_LENGTH_MISMATCH);
1207 goto f_err;
1208 }
1209
1210 q = p;
1211 x = d2i_X509(NULL, &q, l);
1212 if (x == NULL) {
1213 al = SSL_AD_BAD_CERTIFICATE;
1214 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
1215 goto f_err;
1216 }
1217 if (q != (p + l)) {
1218 al = SSL_AD_DECODE_ERROR;
1219 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1220 SSL_R_CERT_LENGTH_MISMATCH);
1221 goto f_err;
1222 }
1223 if (!sk_X509_push(sk, x)) {
1224 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1225 goto err;
1226 }
1227 x = NULL;
1228 nc += l + 3;
1229 p = q;
1230 }
1231
1232 i = ssl_verify_cert_chain(s, sk);
1233 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1234 #ifndef OPENSSL_NO_KRB5
1235 && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1236 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1237 #endif /* OPENSSL_NO_KRB5 */
1238 ) {
1239 al = ssl_verify_alarm_type(s->verify_result);
1240 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1241 SSL_R_CERTIFICATE_VERIFY_FAILED);
1242 goto f_err;
1243 }
1244 ERR_clear_error(); /* but we keep s->verify_result */
1245 if (i > 1) {
1246 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1247 al = SSL_AD_HANDSHAKE_FAILURE;
1248 goto f_err;
1249 }
1250
1251 sc = ssl_sess_cert_new();
1252 if (sc == NULL)
1253 goto err;
1254
1255 ssl_sess_cert_free(s->session->sess_cert);
1256 s->session->sess_cert = sc;
1257
1258 sc->cert_chain = sk;
1259 /*
1260 * Inconsistency alert: cert_chain does include the peer's certificate,
1261 * which we don't include in s3_srvr.c
1262 */
1263 x = sk_X509_value(sk, 0);
1264 sk = NULL;
1265 /*
1266 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1267 */
1268
1269 pkey = X509_get_pubkey(x);
1270
1271 /* VRS: allow null cert if auth == KRB5 */
1272 need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1273 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1274 ? 0 : 1;
1275
1276 #ifdef KSSL_DEBUG
1277 fprintf(stderr, "pkey,x = %p, %p\n", pkey, x);
1278 fprintf(stderr, "ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey));
1279 fprintf(stderr, "cipher, alg, nc = %s, %lx, %lx, %d\n",
1280 s->s3->tmp.new_cipher->name,
1281 s->s3->tmp.new_cipher->algorithm_mkey,
1282 s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1283 #endif /* KSSL_DEBUG */
1284
1285 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) {
1286 x = NULL;
1287 al = SSL3_AL_FATAL;
1288 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1289 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1290 goto f_err;
1291 }
1292
1293 i = ssl_cert_type(x, pkey);
1294 if (need_cert && i < 0) {
1295 x = NULL;
1296 al = SSL3_AL_FATAL;
1297 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1298 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1299 goto f_err;
1300 }
1301
1302 if (need_cert) {
1303 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1304 if (exp_idx >= 0 && i != exp_idx) {
1305 x = NULL;
1306 al = SSL_AD_ILLEGAL_PARAMETER;
1307 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1308 SSL_R_WRONG_CERTIFICATE_TYPE);
1309 goto f_err;
1310 }
1311 sc->peer_cert_type = i;
1312 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1313 /*
1314 * Why would the following ever happen? We just created sc a couple
1315 * of lines ago.
1316 */
1317 X509_free(sc->peer_pkeys[i].x509);
1318 sc->peer_pkeys[i].x509 = x;
1319 sc->peer_key = &(sc->peer_pkeys[i]);
1320
1321 X509_free(s->session->peer);
1322 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1323 s->session->peer = x;
1324 } else {
1325 sc->peer_cert_type = i;
1326 sc->peer_key = NULL;
1327
1328 X509_free(s->session->peer);
1329 s->session->peer = NULL;
1330 }
1331 s->session->verify_result = s->verify_result;
1332
1333 x = NULL;
1334 ret = 1;
1335 if (0) {
1336 f_err:
1337 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1338 }
1339 err:
1340 EVP_PKEY_free(pkey);
1341 X509_free(x);
1342 sk_X509_pop_free(sk, X509_free);
1343 return (ret);
1344 }
1345
1346 int ssl3_get_key_exchange(SSL *s)
1347 {
1348 #ifndef OPENSSL_NO_RSA
1349 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1350 #endif
1351 EVP_MD_CTX md_ctx;
1352 unsigned char *param, *p;
1353 int al, j, ok;
1354 long i, param_len, n, alg_k, alg_a;
1355 EVP_PKEY *pkey = NULL;
1356 const EVP_MD *md = NULL;
1357 #ifndef OPENSSL_NO_RSA
1358 RSA *rsa = NULL;
1359 #endif
1360 #ifndef OPENSSL_NO_DH
1361 DH *dh = NULL;
1362 #endif
1363 #ifndef OPENSSL_NO_EC
1364 EC_KEY *ecdh = NULL;
1365 BN_CTX *bn_ctx = NULL;
1366 EC_POINT *srvr_ecpoint = NULL;
1367 int curve_nid = 0;
1368 int encoded_pt_len = 0;
1369 #endif
1370
1371 EVP_MD_CTX_init(&md_ctx);
1372
1373 /*
1374 * use same message size as in ssl3_get_certificate_request() as
1375 * ServerKeyExchange message may be skipped
1376 */
1377 n = s->method->ssl_get_message(s,
1378 SSL3_ST_CR_KEY_EXCH_A,
1379 SSL3_ST_CR_KEY_EXCH_B,
1380 -1, s->max_cert_list, &ok);
1381 if (!ok)
1382 return ((int)n);
1383
1384 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1385
1386 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1387 /*
1388 * Can't skip server key exchange if this is an ephemeral
1389 * ciphersuite.
1390 */
1391 if (alg_k & (SSL_kDHE | SSL_kECDHE)) {
1392 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1393 al = SSL_AD_UNEXPECTED_MESSAGE;
1394 goto f_err;
1395 }
1396 #ifndef OPENSSL_NO_PSK
1397 /*
1398 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no
1399 * identity hint is sent. Set session->sess_cert anyway to avoid
1400 * problems later.
1401 */
1402 if (alg_k & SSL_kPSK) {
1403 s->session->sess_cert = ssl_sess_cert_new();
1404 if (s->ctx->psk_identity_hint)
1405 OPENSSL_free(s->ctx->psk_identity_hint);
1406 s->ctx->psk_identity_hint = NULL;
1407 }
1408 #endif
1409 s->s3->tmp.reuse_message = 1;
1410 return (1);
1411 }
1412
1413 param = p = (unsigned char *)s->init_msg;
1414 if (s->session->sess_cert != NULL) {
1415 #ifndef OPENSSL_NO_RSA
1416 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1417 s->session->sess_cert->peer_rsa_tmp = NULL;
1418 #endif
1419 #ifndef OPENSSL_NO_DH
1420 DH_free(s->session->sess_cert->peer_dh_tmp);
1421 s->session->sess_cert->peer_dh_tmp = NULL;
1422 #endif
1423 #ifndef OPENSSL_NO_EC
1424 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1425 s->session->sess_cert->peer_ecdh_tmp = NULL;
1426 #endif
1427 } else {
1428 s->session->sess_cert = ssl_sess_cert_new();
1429 }
1430
1431 /* Total length of the parameters including the length prefix */
1432 param_len = 0;
1433
1434 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1435
1436 al = SSL_AD_DECODE_ERROR;
1437
1438 #ifndef OPENSSL_NO_PSK
1439 if (alg_k & SSL_kPSK) {
1440 char tmp_id_hint[PSK_MAX_IDENTITY_LEN + 1];
1441
1442 param_len = 2;
1443 if (param_len > n) {
1444 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1445 goto f_err;
1446 }
1447 n2s(p, i);
1448
1449 /*
1450 * Store PSK identity hint for later use, hint is used in
1451 * ssl3_send_client_key_exchange. Assume that the maximum length of
1452 * a PSK identity hint can be as long as the maximum length of a PSK
1453 * identity.
1454 */
1455 if (i > PSK_MAX_IDENTITY_LEN) {
1456 al = SSL_AD_HANDSHAKE_FAILURE;
1457 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
1458 goto f_err;
1459 }
1460 if (i > n - param_len) {
1461 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1462 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1463 goto f_err;
1464 }
1465 param_len += i;
1466
1467 /*
1468 * If received PSK identity hint contains NULL characters, the hint
1469 * is truncated from the first NULL. p may not be ending with NULL,
1470 * so create a NULL-terminated string.
1471 */
1472 memcpy(tmp_id_hint, p, i);
1473 memset(tmp_id_hint + i, 0, PSK_MAX_IDENTITY_LEN + 1 - i);
1474 if (s->ctx->psk_identity_hint != NULL)
1475 OPENSSL_free(s->ctx->psk_identity_hint);
1476 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1477 if (s->ctx->psk_identity_hint == NULL) {
1478 al = SSL_AD_HANDSHAKE_FAILURE;
1479 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1480 goto f_err;
1481 }
1482
1483 p += i;
1484 n -= param_len;
1485 } else
1486 #endif /* !OPENSSL_NO_PSK */
1487 #ifndef OPENSSL_NO_SRP
1488 if (alg_k & SSL_kSRP) {
1489 param_len = 2;
1490 if (param_len > n) {
1491 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1492 goto f_err;
1493 }
1494 n2s(p, i);
1495
1496 if (i > n - param_len) {
1497 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
1498 goto f_err;
1499 }
1500 param_len += i;
1501
1502 if (!(s->srp_ctx.N = BN_bin2bn(p, i, NULL))) {
1503 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1504 goto err;
1505 }
1506 p += i;
1507
1508 if (2 > n - param_len) {
1509 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1510 goto f_err;
1511 }
1512 param_len += 2;
1513
1514 n2s(p, i);
1515
1516 if (i > n - param_len) {
1517 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
1518 goto f_err;
1519 }
1520 param_len += i;
1521
1522 if (!(s->srp_ctx.g = BN_bin2bn(p, i, NULL))) {
1523 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1524 goto err;
1525 }
1526 p += i;
1527
1528 if (1 > n - param_len) {
1529 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1530 goto f_err;
1531 }
1532 param_len += 1;
1533
1534 i = (unsigned int)(p[0]);
1535 p++;
1536
1537 if (i > n - param_len) {
1538 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
1539 goto f_err;
1540 }
1541 param_len += i;
1542
1543 if (!(s->srp_ctx.s = BN_bin2bn(p, i, NULL))) {
1544 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1545 goto err;
1546 }
1547 p += i;
1548
1549 if (2 > n - param_len) {
1550 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1551 goto f_err;
1552 }
1553 param_len += 2;
1554
1555 n2s(p, i);
1556
1557 if (i > n - param_len) {
1558 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
1559 goto f_err;
1560 }
1561 param_len += i;
1562
1563 if (!(s->srp_ctx.B = BN_bin2bn(p, i, NULL))) {
1564 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1565 goto err;
1566 }
1567 p += i;
1568 n -= param_len;
1569
1570 if (!srp_verify_server_param(s, &al)) {
1571 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
1572 goto f_err;
1573 }
1574
1575 /* We must check if there is a certificate */
1576 # ifndef OPENSSL_NO_RSA
1577 if (alg_a & SSL_aRSA)
1578 pkey =
1579 X509_get_pubkey(s->session->
1580 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1581 # else
1582 if (0) ;
1583 # endif
1584 # ifndef OPENSSL_NO_DSA
1585 else if (alg_a & SSL_aDSS)
1586 pkey =
1587 X509_get_pubkey(s->session->
1588 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1589 x509);
1590 # endif
1591 } else
1592 #endif /* !OPENSSL_NO_SRP */
1593 #ifndef OPENSSL_NO_RSA
1594 if (alg_k & SSL_kRSA) {
1595 /* Temporary RSA keys only allowed in export ciphersuites */
1596 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1597 al = SSL_AD_UNEXPECTED_MESSAGE;
1598 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1599 goto f_err;
1600 }
1601 if ((rsa = RSA_new()) == NULL) {
1602 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1603 goto err;
1604 }
1605
1606 param_len = 2;
1607 if (param_len > n) {
1608 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1609 goto f_err;
1610 }
1611 n2s(p, i);
1612
1613 if (i > n - param_len) {
1614 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1615 goto f_err;
1616 }
1617 param_len += i;
1618
1619 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) {
1620 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1621 goto err;
1622 }
1623 p += i;
1624
1625 if (2 > n - param_len) {
1626 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1627 goto f_err;
1628 }
1629 param_len += 2;
1630
1631 n2s(p, i);
1632
1633 if (i > n - param_len) {
1634 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1635 goto f_err;
1636 }
1637 param_len += i;
1638
1639 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) {
1640 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1641 goto err;
1642 }
1643 p += i;
1644 n -= param_len;
1645
1646 /* this should be because we are using an export cipher */
1647 if (alg_a & SSL_aRSA)
1648 pkey =
1649 X509_get_pubkey(s->session->
1650 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1651 else {
1652 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1653 goto err;
1654 }
1655 s->session->sess_cert->peer_rsa_tmp = rsa;
1656 rsa = NULL;
1657 }
1658 #else /* OPENSSL_NO_RSA */
1659 if (0) ;
1660 #endif
1661 #ifndef OPENSSL_NO_DH
1662 else if (alg_k & SSL_kDHE) {
1663 if ((dh = DH_new()) == NULL) {
1664 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1665 goto err;
1666 }
1667
1668 param_len = 2;
1669 if (param_len > n) {
1670 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1671 goto f_err;
1672 }
1673 n2s(p, i);
1674
1675 if (i > n - param_len) {
1676 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1677 goto f_err;
1678 }
1679 param_len += i;
1680
1681 if (!(dh->p = BN_bin2bn(p, i, NULL))) {
1682 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1683 goto err;
1684 }
1685 p += i;
1686
1687 if (2 > n - param_len) {
1688 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1689 goto f_err;
1690 }
1691 param_len += 2;
1692
1693 n2s(p, i);
1694
1695 if (i > n - param_len) {
1696 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1697 goto f_err;
1698 }
1699 param_len += i;
1700
1701 if (!(dh->g = BN_bin2bn(p, i, NULL))) {
1702 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1703 goto err;
1704 }
1705 p += i;
1706
1707 if (2 > n - param_len) {
1708 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1709 goto f_err;
1710 }
1711 param_len += 2;
1712
1713 n2s(p, i);
1714
1715 if (i > n - param_len) {
1716 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1717 goto f_err;
1718 }
1719 param_len += i;
1720
1721 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) {
1722 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1723 goto err;
1724 }
1725 p += i;
1726 n -= param_len;
1727
1728 if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) {
1729 al = SSL_AD_HANDSHAKE_FAILURE;
1730 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DH_KEY_TOO_SMALL);
1731 goto f_err;
1732 }
1733 # ifndef OPENSSL_NO_RSA
1734 if (alg_a & SSL_aRSA)
1735 pkey =
1736 X509_get_pubkey(s->session->
1737 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1738 # else
1739 if (0) ;
1740 # endif
1741 # ifndef OPENSSL_NO_DSA
1742 else if (alg_a & SSL_aDSS)
1743 pkey =
1744 X509_get_pubkey(s->session->
1745 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1746 x509);
1747 # endif
1748 /* else anonymous DH, so no certificate or pkey. */
1749
1750 s->session->sess_cert->peer_dh_tmp = dh;
1751 dh = NULL;
1752 }
1753 #endif /* !OPENSSL_NO_DH */
1754
1755 #ifndef OPENSSL_NO_EC
1756 else if (alg_k & SSL_kECDHE) {
1757 EC_GROUP *ngroup;
1758 const EC_GROUP *group;
1759
1760 if ((ecdh = EC_KEY_new()) == NULL) {
1761 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1762 goto err;
1763 }
1764
1765 /*
1766 * Extract elliptic curve parameters and the server's ephemeral ECDH
1767 * public key. Keep accumulating lengths of various components in
1768 * param_len and make sure it never exceeds n.
1769 */
1770
1771 /*
1772 * XXX: For now we only support named (not generic) curves and the
1773 * ECParameters in this case is just three bytes. We also need one
1774 * byte for the length of the encoded point
1775 */
1776 param_len = 4;
1777 if (param_len > n) {
1778 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1779 goto f_err;
1780 }
1781 /*
1782 * Check curve is one of our preferences, if not server has sent an
1783 * invalid curve. ECParameters is 3 bytes.
1784 */
1785 if (!tls1_check_curve(s, p, 3)) {
1786 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
1787 goto f_err;
1788 }
1789
1790 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) {
1791 al = SSL_AD_INTERNAL_ERROR;
1792 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1793 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1794 goto f_err;
1795 }
1796
1797 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1798 if (ngroup == NULL) {
1799 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1800 goto err;
1801 }
1802 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1803 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1804 goto err;
1805 }
1806 EC_GROUP_free(ngroup);
1807
1808 group = EC_KEY_get0_group(ecdh);
1809
1810 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1811 (EC_GROUP_get_degree(group) > 163)) {
1812 al = SSL_AD_EXPORT_RESTRICTION;
1813 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1814 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1815 goto f_err;
1816 }
1817
1818 p += 3;
1819
1820 /* Next, get the encoded ECPoint */
1821 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1822 ((bn_ctx = BN_CTX_new()) == NULL)) {
1823 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1824 goto err;
1825 }
1826
1827 encoded_pt_len = *p; /* length of encoded point */
1828 p += 1;
1829
1830 if ((encoded_pt_len > n - param_len) ||
1831 (EC_POINT_oct2point(group, srvr_ecpoint,
1832 p, encoded_pt_len, bn_ctx) == 0)) {
1833 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1834 goto f_err;
1835 }
1836 param_len += encoded_pt_len;
1837
1838 n -= param_len;
1839 p += encoded_pt_len;
1840
1841 /*
1842 * The ECC/TLS specification does not mention the use of DSA to sign
1843 * ECParameters in the server key exchange message. We do support RSA
1844 * and ECDSA.
1845 */
1846 if (0) ;
1847 # ifndef OPENSSL_NO_RSA
1848 else if (alg_a & SSL_aRSA)
1849 pkey =
1850 X509_get_pubkey(s->session->
1851 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1852 # endif
1853 # ifndef OPENSSL_NO_EC
1854 else if (alg_a & SSL_aECDSA)
1855 pkey =
1856 X509_get_pubkey(s->session->
1857 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1858 # endif
1859 /* else anonymous ECDH, so no certificate or pkey. */
1860 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1861 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1862 ecdh = NULL;
1863 BN_CTX_free(bn_ctx);
1864 bn_ctx = NULL;
1865 EC_POINT_free(srvr_ecpoint);
1866 srvr_ecpoint = NULL;
1867 } else if (alg_k) {
1868 al = SSL_AD_UNEXPECTED_MESSAGE;
1869 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1870 goto f_err;
1871 }
1872 #endif /* !OPENSSL_NO_EC */
1873
1874 /* p points to the next byte, there are 'n' bytes left */
1875
1876 /* if it was signed, check the signature */
1877 if (pkey != NULL) {
1878 if (SSL_USE_SIGALGS(s)) {
1879 int rv;
1880 if (2 > n) {
1881 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1882 goto f_err;
1883 }
1884 rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1885 if (rv == -1)
1886 goto err;
1887 else if (rv == 0) {
1888 goto f_err;
1889 }
1890 #ifdef SSL_DEBUG
1891 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1892 #endif
1893 p += 2;
1894 n -= 2;
1895 } else
1896 md = EVP_sha1();
1897
1898 if (2 > n) {
1899 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1900 goto f_err;
1901 }
1902 n2s(p, i);
1903 n -= 2;
1904 j = EVP_PKEY_size(pkey);
1905
1906 /*
1907 * Check signature length. If n is 0 then signature is empty
1908 */
1909 if ((i != n) || (n > j) || (n <= 0)) {
1910 /* wrong packet length */
1911 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1912 goto f_err;
1913 }
1914 #ifndef OPENSSL_NO_RSA
1915 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
1916 int num;
1917 unsigned int size;
1918
1919 j = 0;
1920 q = md_buf;
1921 for (num = 2; num > 0; num--) {
1922 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1923 EVP_DigestInit_ex(&md_ctx, (num == 2)
1924 ? s->ctx->md5 : s->ctx->sha1, NULL);
1925 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1926 SSL3_RANDOM_SIZE);
1927 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1928 SSL3_RANDOM_SIZE);
1929 EVP_DigestUpdate(&md_ctx, param, param_len);
1930 EVP_DigestFinal_ex(&md_ctx, q, &size);
1931 q += size;
1932 j += size;
1933 }
1934 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
1935 if (i < 0) {
1936 al = SSL_AD_DECRYPT_ERROR;
1937 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
1938 goto f_err;
1939 }
1940 if (i == 0) {
1941 /* bad signature */
1942 al = SSL_AD_DECRYPT_ERROR;
1943 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1944 goto f_err;
1945 }
1946 } else
1947 #endif
1948 {
1949 EVP_VerifyInit_ex(&md_ctx, md, NULL);
1950 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1951 SSL3_RANDOM_SIZE);
1952 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1953 SSL3_RANDOM_SIZE);
1954 EVP_VerifyUpdate(&md_ctx, param, param_len);
1955 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1956 /* bad signature */
1957 al = SSL_AD_DECRYPT_ERROR;
1958 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1959 goto f_err;
1960 }
1961 }
1962 } else {
1963 /* aNULL, aSRP or kPSK do not need public keys */
1964 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) {
1965 /* Might be wrong key type, check it */
1966 if (ssl3_check_cert_and_algorithm(s))
1967 /* Otherwise this shouldn't happen */
1968 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1969 goto err;
1970 }
1971 /* still data left over */
1972 if (n != 0) {
1973 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
1974 goto f_err;
1975 }
1976 }
1977 EVP_PKEY_free(pkey);
1978 EVP_MD_CTX_cleanup(&md_ctx);
1979 return (1);
1980 f_err:
1981 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1982 err:
1983 EVP_PKEY_free(pkey);
1984 #ifndef OPENSSL_NO_RSA
1985 RSA_free(rsa);
1986 #endif
1987 #ifndef OPENSSL_NO_DH
1988 DH_free(dh);
1989 #endif
1990 #ifndef OPENSSL_NO_EC
1991 BN_CTX_free(bn_ctx);
1992 EC_POINT_free(srvr_ecpoint);
1993 EC_KEY_free(ecdh);
1994 #endif
1995 EVP_MD_CTX_cleanup(&md_ctx);
1996 return (-1);
1997 }
1998
1999 int ssl3_get_certificate_request(SSL *s)
2000 {
2001 int ok, ret = 0;
2002 unsigned long n, nc, l;
2003 unsigned int llen, ctype_num, i;
2004 X509_NAME *xn = NULL;
2005 const unsigned char *p, *q;
2006 unsigned char *d;
2007 STACK_OF(X509_NAME) *ca_sk = NULL;
2008
2009 n = s->method->ssl_get_message(s,
2010 SSL3_ST_CR_CERT_REQ_A,
2011 SSL3_ST_CR_CERT_REQ_B,
2012 -1, s->max_cert_list, &ok);
2013
2014 if (!ok)
2015 return ((int)n);
2016
2017 s->s3->tmp.cert_req = 0;
2018
2019 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
2020 s->s3->tmp.reuse_message = 1;
2021 /*
2022 * If we get here we don't need any cached handshake records as we
2023 * wont be doing client auth.
2024 */
2025 if (s->s3->handshake_buffer) {
2026 if (!ssl3_digest_cached_records(s))
2027 goto err;
2028 }
2029 return (1);
2030 }
2031
2032 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
2033 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2034 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
2035 goto err;
2036 }
2037
2038 /* TLS does not like anon-DH with client cert */
2039 if (s->version > SSL3_VERSION) {
2040 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
2041 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2042 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2043 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2044 goto err;
2045 }
2046 }
2047
2048 p = d = (unsigned char *)s->init_msg;
2049
2050 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
2051 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2052 goto err;
2053 }
2054
2055 /* get the certificate types */
2056 ctype_num = *(p++);
2057 if (s->cert->ctypes) {
2058 OPENSSL_free(s->cert->ctypes);
2059 s->cert->ctypes = NULL;
2060 }
2061 if (ctype_num > SSL3_CT_NUMBER) {
2062 /* If we exceed static buffer copy all to cert structure */
2063 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2064 if (s->cert->ctypes == NULL) {
2065 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2066 goto err;
2067 }
2068 memcpy(s->cert->ctypes, p, ctype_num);
2069 s->cert->ctype_num = (size_t)ctype_num;
2070 ctype_num = SSL3_CT_NUMBER;
2071 }
2072 for (i = 0; i < ctype_num; i++)
2073 s->s3->tmp.ctype[i] = p[i];
2074 p += p[-1];
2075 if (SSL_USE_SIGALGS(s)) {
2076 n2s(p, llen);
2077 /*
2078 * Check we have enough room for signature algorithms and following
2079 * length value.
2080 */
2081 if ((unsigned long)(p - d + llen + 2) > n) {
2082 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2083 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2084 SSL_R_DATA_LENGTH_TOO_LONG);
2085 goto err;
2086 }
2087 /* Clear certificate digests and validity flags */
2088 for (i = 0; i < SSL_PKEY_NUM; i++) {
2089 s->cert->pkeys[i].digest = NULL;
2090 s->cert->pkeys[i].valid_flags = 0;
2091 }
2092 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) {
2093 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2094 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2095 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2096 goto err;
2097 }
2098 if (!tls1_process_sigalgs(s)) {
2099 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2100 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2101 goto err;
2102 }
2103 p += llen;
2104 }
2105
2106 /* get the CA RDNs */
2107 n2s(p, llen);
2108
2109 if ((unsigned long)(p - d + llen) != n) {
2110 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2111 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
2112 goto err;
2113 }
2114
2115 for (nc = 0; nc < llen;) {
2116 n2s(p, l);
2117 if ((l + nc + 2) > llen) {
2118 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2119 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
2120 goto err;
2121 }
2122
2123 q = p;
2124
2125 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
2126 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2127 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
2128 goto err;
2129 }
2130
2131 if (q != (p + l)) {
2132 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2133 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2134 SSL_R_CA_DN_LENGTH_MISMATCH);
2135 goto err;
2136 }
2137 if (!sk_X509_NAME_push(ca_sk, xn)) {
2138 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2139 goto err;
2140 }
2141
2142 p += l;
2143 nc += l + 2;
2144 }
2145
2146 /* we should setup a certificate to return.... */
2147 s->s3->tmp.cert_req = 1;
2148 s->s3->tmp.ctype_num = ctype_num;
2149 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
2150 s->s3->tmp.ca_names = ca_sk;
2151 ca_sk = NULL;
2152
2153 ret = 1;
2154 err:
2155 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
2156 return (ret);
2157 }
2158
2159 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
2160 {
2161 return (X509_NAME_cmp(*a, *b));
2162 }
2163
2164 #ifndef OPENSSL_NO_TLSEXT
2165 int ssl3_get_new_session_ticket(SSL *s)
2166 {
2167 int ok, al, ret = 0, ticklen;
2168 long n;
2169 const unsigned char *p;
2170 unsigned char *d;
2171
2172 n = s->method->ssl_get_message(s,
2173 SSL3_ST_CR_SESSION_TICKET_A,
2174 SSL3_ST_CR_SESSION_TICKET_B,
2175 SSL3_MT_NEWSESSION_TICKET, 16384, &ok);
2176
2177 if (!ok)
2178 return ((int)n);
2179
2180 if (n < 6) {
2181 /* need at least ticket_lifetime_hint + ticket length */
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
2187 p = d = (unsigned char *)s->init_msg;
2188 n2l(p, s->session->tlsext_tick_lifetime_hint);
2189 n2s(p, ticklen);
2190 /* ticket_lifetime_hint + ticket_length + ticket */
2191 if (ticklen + 6 != n) {
2192 al = SSL_AD_DECODE_ERROR;
2193 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2194 goto f_err;
2195 }
2196 if (s->session->tlsext_tick) {
2197 OPENSSL_free(s->session->tlsext_tick);
2198 s->session->tlsext_ticklen = 0;
2199 }
2200 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2201 if (!s->session->tlsext_tick) {
2202 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2203 goto err;
2204 }
2205 memcpy(s->session->tlsext_tick, p, ticklen);
2206 s->session->tlsext_ticklen = ticklen;
2207 /*
2208 * There are two ways to detect a resumed ticket session. One is to set
2209 * an appropriate session ID and then the server must return a match in
2210 * ServerHello. This allows the normal client session ID matching to work
2211 * and we know much earlier that the ticket has been accepted. The
2212 * other way is to set zero length session ID when the ticket is
2213 * presented and rely on the handshake to determine session resumption.
2214 * We choose the former approach because this fits in with assumptions
2215 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
2216 * SHA256 is disabled) hash of the ticket.
2217 */
2218 EVP_Digest(p, ticklen,
2219 s->session->session_id, &s->session->session_id_length,
2220 EVP_sha256(), NULL);
2221 ret = 1;
2222 return (ret);
2223 f_err:
2224 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2225 err:
2226 return (-1);
2227 }
2228
2229 int ssl3_get_cert_status(SSL *s)
2230 {
2231 int ok, al;
2232 unsigned long resplen, n;
2233 const unsigned char *p;
2234
2235 n = s->method->ssl_get_message(s,
2236 SSL3_ST_CR_CERT_STATUS_A,
2237 SSL3_ST_CR_CERT_STATUS_B,
2238 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
2239
2240 if (!ok)
2241 return ((int)n);
2242 if (n < 4) {
2243 /* need at least status type + length */
2244 al = SSL_AD_DECODE_ERROR;
2245 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2246 goto f_err;
2247 }
2248 p = (unsigned char *)s->init_msg;
2249 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
2250 al = SSL_AD_DECODE_ERROR;
2251 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
2252 goto f_err;
2253 }
2254 n2l3(p, resplen);
2255 if (resplen + 4 != n) {
2256 al = SSL_AD_DECODE_ERROR;
2257 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2258 goto f_err;
2259 }
2260 if (s->tlsext_ocsp_resp)
2261 OPENSSL_free(s->tlsext_ocsp_resp);
2262 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2263 if (!s->tlsext_ocsp_resp) {
2264 al = SSL_AD_INTERNAL_ERROR;
2265 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2266 goto f_err;
2267 }
2268 s->tlsext_ocsp_resplen = resplen;
2269 if (s->ctx->tlsext_status_cb) {
2270 int ret;
2271 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2272 if (ret == 0) {
2273 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2274 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
2275 goto f_err;
2276 }
2277 if (ret < 0) {
2278 al = SSL_AD_INTERNAL_ERROR;
2279 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2280 goto f_err;
2281 }
2282 }
2283 return 1;
2284 f_err:
2285 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2286 return (-1);
2287 }
2288 #endif
2289
2290 int ssl3_get_server_done(SSL *s)
2291 {
2292 int ok, ret = 0;
2293 long n;
2294
2295 /* Second to last param should be very small, like 0 :-) */
2296 n = s->method->ssl_get_message(s,
2297 SSL3_ST_CR_SRVR_DONE_A,
2298 SSL3_ST_CR_SRVR_DONE_B,
2299 SSL3_MT_SERVER_DONE, 30, &ok);
2300
2301 if (!ok)
2302 return ((int)n);
2303 if (n > 0) {
2304 /* should contain no data */
2305 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2306 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
2307 return -1;
2308 }
2309 ret = 1;
2310 return (ret);
2311 }
2312
2313 int ssl3_send_client_key_exchange(SSL *s)
2314 {
2315 unsigned char *p;
2316 int n;
2317 unsigned long alg_k;
2318 #ifndef OPENSSL_NO_RSA
2319 unsigned char *q;
2320 EVP_PKEY *pkey = NULL;
2321 #endif
2322 #ifndef OPENSSL_NO_KRB5
2323 KSSL_ERR kssl_err;
2324 #endif /* OPENSSL_NO_KRB5 */
2325 #ifndef OPENSSL_NO_EC
2326 EC_KEY *clnt_ecdh = NULL;
2327 const EC_POINT *srvr_ecpoint = NULL;
2328 EVP_PKEY *srvr_pub_pkey = NULL;
2329 unsigned char *encodedPoint = NULL;
2330 int encoded_pt_len = 0;
2331 BN_CTX *bn_ctx = NULL;
2332 #endif
2333 unsigned char *pms = NULL;
2334 size_t pmslen = 0;
2335
2336 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
2337 p = ssl_handshake_start(s);
2338
2339 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2340
2341 /* Fool emacs indentation */
2342 if (0) {
2343 }
2344 #ifndef OPENSSL_NO_RSA
2345 else if (alg_k & SSL_kRSA) {
2346 RSA *rsa;
2347 pmslen = SSL_MAX_MASTER_KEY_LENGTH;
2348 pms = OPENSSL_malloc(pmslen);
2349 if (!pms)
2350 goto memerr;
2351
2352 if (s->session->sess_cert == NULL) {
2353 /*
2354 * We should always have a server certificate with SSL_kRSA.
2355 */
2356 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2357 ERR_R_INTERNAL_ERROR);
2358 goto err;
2359 }
2360
2361 if (s->session->sess_cert->peer_rsa_tmp != NULL)
2362 rsa = s->session->sess_cert->peer_rsa_tmp;
2363 else {
2364 pkey =
2365 X509_get_pubkey(s->session->
2366 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
2367 x509);
2368 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
2369 || (pkey->pkey.rsa == NULL)) {
2370 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2371 ERR_R_INTERNAL_ERROR);
2372 goto err;
2373 }
2374 rsa = pkey->pkey.rsa;
2375 EVP_PKEY_free(pkey);
2376 }
2377
2378 pms[0] = s->client_version >> 8;
2379 pms[1] = s->client_version & 0xff;
2380 if (RAND_bytes(pms + 2, pmslen - 2) <= 0)
2381 goto err;
2382
2383 q = p;
2384 /* Fix buf for TLS and beyond */
2385 if (s->version > SSL3_VERSION)
2386 p += 2;
2387 n = RSA_public_encrypt(pmslen, pms, p, rsa, RSA_PKCS1_PADDING);
2388 # ifdef PKCS1_CHECK
2389 if (s->options & SSL_OP_PKCS1_CHECK_1)
2390 p[1]++;
2391 if (s->options & SSL_OP_PKCS1_CHECK_2)
2392 tmp_buf[0] = 0x70;
2393 # endif
2394 if (n <= 0) {
2395 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2396 SSL_R_BAD_RSA_ENCRYPT);
2397 goto err;
2398 }
2399
2400 /* Fix buf for TLS and beyond */
2401 if (s->version > SSL3_VERSION) {
2402 s2n(n, q);
2403 n += 2;
2404 }
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 pmslen = SSL_MAX_MASTER_KEY_LENGTH;
2495 pms = OPENSSL_malloc(pmslen);
2496 if (!pms)
2497 goto memerr;
2498
2499 pms[0] = s->client_version >> 8;
2500 pms[1] = s->client_version & 0xff;
2501 if (RAND_bytes(pms + 2, pmslen - 2) <= 0)
2502 goto err;
2503
2504 /*-
2505 * 20010420 VRS. Tried it this way; failed.
2506 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2507 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2508 * kssl_ctx->length);
2509 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2510 */
2511
2512 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2513 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
2514 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, pms, pmslen);
2515 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
2516 outl += padl;
2517 if (outl > (int)sizeof epms) {
2518 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2519 ERR_R_INTERNAL_ERROR);
2520 goto err;
2521 }
2522 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2523
2524 /* KerberosWrapper.EncryptedPreMasterSecret */
2525 s2n(outl, p);
2526 memcpy(p, epms, outl);
2527 p += outl;
2528 n += outl + 2;
2529 OPENSSL_cleanse(epms, outl);
2530 }
2531 #endif
2532 #ifndef OPENSSL_NO_DH
2533 else if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
2534 DH *dh_srvr, *dh_clnt;
2535 SESS_CERT *scert = s->session->sess_cert;
2536
2537 if (scert == NULL) {
2538 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2539 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2540 SSL_R_UNEXPECTED_MESSAGE);
2541 goto err;
2542 }
2543
2544 if (scert->peer_dh_tmp != NULL)
2545 dh_srvr = scert->peer_dh_tmp;
2546 else {
2547 /* we get them from the cert */
2548 int idx = scert->peer_cert_type;
2549 EVP_PKEY *spkey = NULL;
2550 dh_srvr = NULL;
2551 if (idx >= 0)
2552 spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509);
2553 if (spkey) {
2554 dh_srvr = EVP_PKEY_get1_DH(spkey);
2555 EVP_PKEY_free(spkey);
2556 }
2557 if (dh_srvr == NULL) {
2558 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2559 ERR_R_INTERNAL_ERROR);
2560 goto err;
2561 }
2562 }
2563 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
2564 /* Use client certificate key */
2565 EVP_PKEY *clkey = s->cert->key->privatekey;
2566 dh_clnt = NULL;
2567 if (clkey)
2568 dh_clnt = EVP_PKEY_get1_DH(clkey);
2569 if (dh_clnt == NULL) {
2570 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2571 ERR_R_INTERNAL_ERROR);
2572 goto err;
2573 }
2574 } else {
2575 /* generate a new random key */
2576 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2577 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2578 goto err;
2579 }
2580 if (!DH_generate_key(dh_clnt)) {
2581 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2582 DH_free(dh_clnt);
2583 goto err;
2584 }
2585 }
2586
2587 pmslen = DH_size(dh_clnt);
2588 pms = OPENSSL_malloc(pmslen);
2589 if (!pms)
2590 goto memerr;
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(pms, 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 pmslen = n;
2607
2608 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2609 n = 0;
2610 else {
2611 /* send off the data */
2612 n = BN_num_bytes(dh_clnt->pub_key);
2613 s2n(n, p);
2614 BN_bn2bin(dh_clnt->pub_key, p);
2615 n += 2;
2616 }
2617
2618 DH_free(dh_clnt);
2619
2620 /* perhaps clean things up a bit EAY EAY EAY EAY */
2621 }
2622 #endif
2623
2624 #ifndef OPENSSL_NO_EC
2625 else if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe)) {
2626 const EC_GROUP *srvr_group = NULL;
2627 EC_KEY *tkey;
2628 int ecdh_clnt_cert = 0;
2629 int field_size = 0;
2630
2631 if (s->session->sess_cert == NULL) {
2632 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2633 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2634 SSL_R_UNEXPECTED_MESSAGE);
2635 goto err;
2636 }
2637
2638 /*
2639 * Did we send out the client's ECDH share for use in premaster
2640 * computation as part of client certificate? If so, set
2641 * ecdh_clnt_cert to 1.
2642 */
2643 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
2644 /*-
2645 * XXX: For now, we do not support client
2646 * authentication using ECDH certificates.
2647 * To add such support, one needs to add
2648 * code that checks for appropriate
2649 * conditions and sets ecdh_clnt_cert to 1.
2650 * For example, the cert have an ECC
2651 * key on the same curve as the server's
2652 * and the key should be authorized for
2653 * key agreement.
2654 *
2655 * One also needs to add code in ssl3_connect
2656 * to skip sending the certificate verify
2657 * message.
2658 *
2659 * if ((s->cert->key->privatekey != NULL) &&
2660 * (s->cert->key->privatekey->type ==
2661 * EVP_PKEY_EC) && ...)
2662 * ecdh_clnt_cert = 1;
2663 */
2664 }
2665
2666 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2667 tkey = s->session->sess_cert->peer_ecdh_tmp;
2668 } else {
2669 /* Get the Server Public Key from Cert */
2670 srvr_pub_pkey =
2671 X509_get_pubkey(s->session->
2672 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2673 if ((srvr_pub_pkey == NULL)
2674 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2675 || (srvr_pub_pkey->pkey.ec == NULL)) {
2676 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2677 ERR_R_INTERNAL_ERROR);
2678 goto err;
2679 }
2680
2681 tkey = srvr_pub_pkey->pkey.ec;
2682 }
2683
2684 srvr_group = EC_KEY_get0_group(tkey);
2685 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2686
2687 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2688 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2689 ERR_R_INTERNAL_ERROR);
2690 goto err;
2691 }
2692
2693 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2694 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2695 ERR_R_MALLOC_FAILURE);
2696 goto err;
2697 }
2698
2699 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2700 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2701 goto err;
2702 }
2703 if (ecdh_clnt_cert) {
2704 /*
2705 * Reuse key info from our certificate We only need our
2706 * private key to perform the ECDH computation.
2707 */
2708 const BIGNUM *priv_key;
2709 tkey = s->cert->key->privatekey->pkey.ec;
2710 priv_key = EC_KEY_get0_private_key(tkey);
2711 if (priv_key == NULL) {
2712 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2713 ERR_R_MALLOC_FAILURE);
2714 goto err;
2715 }
2716 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2717 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2718 goto err;
2719 }
2720 } else {
2721 /* Generate a new ECDH key pair */
2722 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2723 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2724 ERR_R_ECDH_LIB);
2725 goto err;
2726 }
2727 }
2728
2729 /*
2730 * use the 'p' output buffer for the ECDH key, but make sure to
2731 * clear it out afterwards
2732 */
2733
2734 field_size = EC_GROUP_get_degree(srvr_group);
2735 if (field_size <= 0) {
2736 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2737 goto err;
2738 }
2739 pmslen = (field_size + 7) / 8;
2740 pms = OPENSSL_malloc(pmslen);
2741 if (!pms)
2742 goto memerr;
2743 n = ECDH_compute_key(pms, pmslen, srvr_ecpoint, clnt_ecdh, NULL);
2744 if (n <= 0 || pmslen != (size_t)n) {
2745 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2746 goto err;
2747 }
2748
2749 if (ecdh_clnt_cert) {
2750 /* Send empty client key exch message */
2751 n = 0;
2752 } else {
2753 /*
2754 * First check the size of encoding and allocate memory
2755 * accordingly.
2756 */
2757 encoded_pt_len =
2758 EC_POINT_point2oct(srvr_group,
2759 EC_KEY_get0_public_key(clnt_ecdh),
2760 POINT_CONVERSION_UNCOMPRESSED,
2761 NULL, 0, NULL);
2762
2763 encodedPoint = (unsigned char *)
2764 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2765 bn_ctx = BN_CTX_new();
2766 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2767 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2768 ERR_R_MALLOC_FAILURE);
2769 goto err;
2770 }
2771
2772 /* Encode the public key */
2773 n = EC_POINT_point2oct(srvr_group,
2774 EC_KEY_get0_public_key(clnt_ecdh),
2775 POINT_CONVERSION_UNCOMPRESSED,
2776 encodedPoint, encoded_pt_len, bn_ctx);
2777
2778 *p = n; /* length of encoded point */
2779 /* Encoded point will be copied here */
2780 p += 1;
2781 /* copy the point */
2782 memcpy((unsigned char *)p, encodedPoint, n);
2783 /* increment n to account for length field */
2784 n += 1;
2785 }
2786
2787 /* Free allocated memory */
2788 BN_CTX_free(bn_ctx);
2789 if (encodedPoint != NULL)
2790 OPENSSL_free(encodedPoint);
2791 EC_KEY_free(clnt_ecdh);
2792 EVP_PKEY_free(srvr_pub_pkey);
2793 }
2794 #endif /* !OPENSSL_NO_EC */
2795 else if (alg_k & SSL_kGOST) {
2796 /* GOST key exchange message creation */
2797 EVP_PKEY_CTX *pkey_ctx;
2798 X509 *peer_cert;
2799 size_t msglen;
2800 unsigned int md_len;
2801 int keytype;
2802 unsigned char shared_ukm[32], tmp[256];
2803 EVP_MD_CTX *ukm_hash;
2804 EVP_PKEY *pub_key;
2805
2806 pmslen = 32;
2807 pms = OPENSSL_malloc(pmslen);
2808 if (!pms)
2809 goto memerr;
2810
2811 /*
2812 * Get server sertificate PKEY and create ctx from it
2813 */
2814 peer_cert =
2815 s->session->
2816 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509;
2817 if (!peer_cert)
2818 peer_cert =
2819 s->session->
2820 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509;
2821 if (!peer_cert) {
2822 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2823 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2824 goto err;
2825 }
2826
2827 pkey_ctx = EVP_PKEY_CTX_new(pub_key =
2828 X509_get_pubkey(peer_cert), NULL);
2829 /*
2830 * If we have send a certificate, and certificate key
2831 *
2832 * * parameters match those of server certificate, use
2833 * certificate key for key exchange
2834 */
2835
2836 /* Otherwise, generate ephemeral key pair */
2837
2838 EVP_PKEY_encrypt_init(pkey_ctx);
2839 /* Generate session key */
2840 if (RAND_bytes(pms, pmslen) <= 0) {
2841 EVP_PKEY_CTX_free(pkey_ctx);
2842 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2843 ERR_R_INTERNAL_ERROR);
2844 goto err;
2845 };
2846 /*
2847 * If we have client certificate, use its secret as peer key
2848 */
2849 if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2850 if (EVP_PKEY_derive_set_peer
2851 (pkey_ctx, s->cert->key->privatekey) <= 0) {
2852 /*
2853 * If there was an error - just ignore it. Ephemeral key
2854 * * would be used
2855 */
2856 ERR_clear_error();
2857 }
2858 }
2859 /*
2860 * Compute shared IV and store it in algorithm-specific context
2861 * data
2862 */
2863 ukm_hash = EVP_MD_CTX_create();
2864 EVP_DigestInit(ukm_hash,
2865 EVP_get_digestbynid(NID_id_GostR3411_94));
2866 EVP_DigestUpdate(ukm_hash, s->s3->client_random,
2867 SSL3_RANDOM_SIZE);
2868 EVP_DigestUpdate(ukm_hash, s->s3->server_random,
2869 SSL3_RANDOM_SIZE);
2870 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2871 EVP_MD_CTX_destroy(ukm_hash);
2872 if (EVP_PKEY_CTX_ctrl
2873 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8,
2874 shared_ukm) < 0) {
2875 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2876 SSL_R_LIBRARY_BUG);
2877 goto err;
2878 }
2879 /* Make GOST keytransport blob message */
2880 /*
2881 * Encapsulate it into sequence
2882 */
2883 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2884 msglen = 255;
2885 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) < 0) {
2886 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2887 SSL_R_LIBRARY_BUG);
2888 goto err;
2889 }
2890 if (msglen >= 0x80) {
2891 *(p++) = 0x81;
2892 *(p++) = msglen & 0xff;
2893 n = msglen + 3;
2894 } else {
2895 *(p++) = msglen & 0xff;
2896 n = msglen + 2;
2897 }
2898 memcpy(p, tmp, msglen);
2899 /* Check if pubkey from client certificate was used */
2900 if (EVP_PKEY_CTX_ctrl
2901 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) {
2902 /* Set flag "skip certificate verify" */
2903 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2904 }
2905 EVP_PKEY_CTX_free(pkey_ctx);
2906 EVP_PKEY_free(pub_key);
2907
2908 }
2909 #ifndef OPENSSL_NO_SRP
2910 else if (alg_k & SSL_kSRP) {
2911 if (s->srp_ctx.A != NULL) {
2912 /* send off the data */
2913 n = BN_num_bytes(s->srp_ctx.A);
2914 s2n(n, p);
2915 BN_bn2bin(s->srp_ctx.A, p);
2916 n += 2;
2917 } else {
2918 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2919 ERR_R_INTERNAL_ERROR);
2920 goto err;
2921 }
2922 if (s->session->srp_username != NULL)
2923 OPENSSL_free(s->session->srp_username);
2924 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2925 if (s->session->srp_username == NULL) {
2926 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2927 ERR_R_MALLOC_FAILURE);
2928 goto err;
2929 }
2930 }
2931 #endif
2932 #ifndef OPENSSL_NO_PSK
2933 else if (alg_k & SSL_kPSK) {
2934 /*
2935 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
2936 * \0-terminated identity. The last byte is for us for simulating
2937 * strnlen.
2938 */
2939 char identity[PSK_MAX_IDENTITY_LEN + 2];
2940 size_t identity_len;
2941 unsigned char *t = NULL;
2942 unsigned int psk_len = 0;
2943 int psk_err = 1;
2944
2945 n = 0;
2946 if (s->psk_client_callback == NULL) {
2947 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2948 SSL_R_PSK_NO_CLIENT_CB);
2949 goto err;
2950 }
2951
2952 memset(identity, 0, sizeof(identity));
2953 /* Allocate maximum size buffer */
2954 pmslen = PSK_MAX_PSK_LEN * 2 + 4;
2955 pms = OPENSSL_malloc(pmslen);
2956 if (!pms)
2957 goto memerr;
2958
2959 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2960 identity, sizeof(identity) - 1,
2961 pms, pmslen);
2962 if (psk_len > PSK_MAX_PSK_LEN) {
2963 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2964 ERR_R_INTERNAL_ERROR);
2965 goto psk_err;
2966 } else if (psk_len == 0) {
2967 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2968 SSL_R_PSK_IDENTITY_NOT_FOUND);
2969 goto psk_err;
2970 }
2971 /* Change pmslen to real length */
2972 pmslen = 2 + psk_len + 2 + psk_len;
2973 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
2974 identity_len = strlen(identity);
2975 if (identity_len > PSK_MAX_IDENTITY_LEN) {
2976 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2977 ERR_R_INTERNAL_ERROR);
2978 goto psk_err;
2979 }
2980 /* create PSK pre_master_secret */
2981 t = pms;
2982 memmove(pms + psk_len + 4, pms, psk_len);
2983 s2n(psk_len, t);
2984 memset(t, 0, psk_len);
2985 t += psk_len;
2986 s2n(psk_len, t);
2987
2988 if (s->session->psk_identity_hint != NULL)
2989 OPENSSL_free(s->session->psk_identity_hint);
2990 s->session->psk_identity_hint =
2991 BUF_strdup(s->ctx->psk_identity_hint);
2992 if (s->ctx->psk_identity_hint != NULL
2993 && s->session->psk_identity_hint == NULL) {
2994 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2995 ERR_R_MALLOC_FAILURE);
2996 goto psk_err;
2997 }
2998
2999 if (s->session->psk_identity != NULL)
3000 OPENSSL_free(s->session->psk_identity);
3001 s->session->psk_identity = BUF_strdup(identity);
3002 if (s->session->psk_identity == NULL) {
3003 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3004 ERR_R_MALLOC_FAILURE);
3005 goto psk_err;
3006 }
3007
3008 s2n(identity_len, p);
3009 memcpy(p, identity, identity_len);
3010 n = 2 + identity_len;
3011 psk_err = 0;
3012 psk_err:
3013 OPENSSL_cleanse(identity, sizeof(identity));
3014 if (psk_err != 0) {
3015 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3016 goto err;
3017 }
3018 }
3019 #endif
3020 else {
3021 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3022 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3023 goto err;
3024 }
3025
3026 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n)) {
3027 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3028 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3029 goto err;
3030 }
3031
3032 s->state = SSL3_ST_CW_KEY_EXCH_B;
3033 }
3034
3035 /* SSL3_ST_CW_KEY_EXCH_B */
3036 n = ssl_do_write(s);
3037 #ifndef OPENSSL_NO_SRP
3038 /* Check for SRP */
3039 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
3040 /*
3041 * If everything written generate master key: no need to save PMS as
3042 * SRP_generate_client_master_secret generates it internally.
3043 */
3044 if (n > 0) {
3045 if ((s->session->master_key_length =
3046 SRP_generate_client_master_secret(s,
3047 s->session->master_key)) <
3048 0) {
3049 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3050 ERR_R_INTERNAL_ERROR);
3051 goto err;
3052 }
3053 }
3054 } else
3055 #endif
3056 /* If we haven't written everything save PMS */
3057 if (n <= 0) {
3058 s->cert->pms = pms;
3059 s->cert->pmslen = pmslen;
3060 } else {
3061 /* If we don't have a PMS restore */
3062 if (pms == NULL) {
3063 pms = s->cert->pms;
3064 pmslen = s->cert->pmslen;
3065 }
3066 if (pms == NULL) {
3067 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3068 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
3069 goto err;
3070 }
3071 s->session->master_key_length =
3072 s->method->ssl3_enc->generate_master_secret(s,
3073 s->
3074 session->master_key,
3075 pms, pmslen);
3076 OPENSSL_clear_free(pms, pmslen);
3077 s->cert->pms = NULL;
3078 if (s->session->master_key_length < 0) {
3079 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3080 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3081 goto err;
3082 }
3083 }
3084 return n;
3085 memerr:
3086 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3087 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
3088 err:
3089 OPENSSL_clear_free(pms, pmslen);
3090 s->cert->pms = NULL;
3091 #ifndef OPENSSL_NO_EC
3092 BN_CTX_free(bn_ctx);
3093 if (encodedPoint != NULL)
3094 OPENSSL_free(encodedPoint);
3095 EC_KEY_free(clnt_ecdh);
3096 EVP_PKEY_free(srvr_pub_pkey);
3097 #endif
3098 return (-1);
3099 }
3100
3101 int ssl3_send_client_verify(SSL *s)
3102 {
3103 unsigned char *p;
3104 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
3105 EVP_PKEY *pkey;
3106 EVP_PKEY_CTX *pctx = NULL;
3107 EVP_MD_CTX mctx;
3108 unsigned u = 0;
3109 unsigned long n;
3110 int j;
3111
3112 EVP_MD_CTX_init(&mctx);
3113
3114 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
3115 p = ssl_handshake_start(s);
3116 pkey = s->cert->key->privatekey;
3117 /* Create context from key and test if sha1 is allowed as digest */
3118 pctx = EVP_PKEY_CTX_new(pkey, NULL);
3119 EVP_PKEY_sign_init(pctx);
3120 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
3121 if (!SSL_USE_SIGALGS(s))
3122 s->method->ssl3_enc->cert_verify_mac(s,
3123 NID_sha1,
3124 &(data
3125 [MD5_DIGEST_LENGTH]));
3126 } else {
3127 ERR_clear_error();
3128 }
3129 /*
3130 * For TLS v1.2 send signature algorithm and signature using agreed
3131 * digest and cached handshake records.
3132 */
3133 if (SSL_USE_SIGALGS(s)) {
3134 long hdatalen = 0;
3135 void *hdata;
3136 const EVP_MD *md = s->cert->key->digest;
3137 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3138 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) {
3139 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3140 goto err;
3141 }
3142 p += 2;
3143 #ifdef SSL_DEBUG
3144 fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3145 EVP_MD_name(md));
3146 #endif
3147 if (!EVP_SignInit_ex(&mctx, md, NULL)
3148 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3149 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
3150 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB);
3151 goto err;
3152 }
3153 s2n(u, p);
3154 n = u + 4;
3155 /*
3156 * For extended master secret we've already digested cached
3157 * records.
3158 */
3159 if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
3160 BIO_free(s->s3->handshake_buffer);
3161 s->s3->handshake_buffer = NULL;
3162 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3163 } else if (!ssl3_digest_cached_records(s))
3164 goto err;
3165 } else
3166 #ifndef OPENSSL_NO_RSA
3167 if (pkey->type == EVP_PKEY_RSA) {
3168 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
3169 if (RSA_sign(NID_md5_sha1, data,
3170 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
3171 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
3172 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
3173 goto err;
3174 }
3175 s2n(u, p);
3176 n = u + 2;
3177 } else
3178 #endif
3179 #ifndef OPENSSL_NO_DSA
3180 if (pkey->type == EVP_PKEY_DSA) {
3181 if (!DSA_sign(pkey->save_type,
3182 &(data[MD5_DIGEST_LENGTH]),
3183 SHA_DIGEST_LENGTH, &(p[2]),
3184 (unsigned int *)&j, pkey->pkey.dsa)) {
3185 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
3186 goto err;
3187 }
3188 s2n(j, p);
3189 n = j + 2;
3190 } else
3191 #endif
3192 #ifndef OPENSSL_NO_EC
3193 if (pkey->type == EVP_PKEY_EC) {
3194 if (!ECDSA_sign(pkey->save_type,
3195 &(data[MD5_DIGEST_LENGTH]),
3196 SHA_DIGEST_LENGTH, &(p[2]),
3197 (unsigned int *)&j, pkey->pkey.ec)) {
3198 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
3199 goto err;
3200 }
3201 s2n(j, p);
3202 n = j + 2;
3203 } else
3204 #endif
3205 if (pkey->type == NID_id_GostR3410_94
3206 || pkey->type == NID_id_GostR3410_2001) {
3207 unsigned char signbuf[64];
3208 int i;
3209 size_t sigsize = 64;
3210 s->method->ssl3_enc->cert_verify_mac(s,
3211 NID_id_GostR3411_94, data);
3212 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3213 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3214 goto err;
3215 }
3216 for (i = 63, j = 0; i >= 0; j++, i--) {
3217 p[2 + j] = signbuf[i];
3218 }
3219 s2n(j, p);
3220 n = j + 2;
3221 } else {
3222 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3223 goto err;
3224 }
3225 if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n)) {
3226 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3227 goto err;
3228 }
3229 s->state = SSL3_ST_CW_CERT_VRFY_B;
3230 }
3231 EVP_MD_CTX_cleanup(&mctx);
3232 EVP_PKEY_CTX_free(pctx);
3233 return ssl_do_write(s);
3234 err:
3235 EVP_MD_CTX_cleanup(&mctx);
3236 EVP_PKEY_CTX_free(pctx);
3237 return (-1);
3238 }
3239
3240 /*
3241 * Check a certificate can be used for client authentication. Currently check
3242 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
3243 * certificates can be used and optionally checks suitability for Suite B.
3244 */
3245 static int ssl3_check_client_certificate(SSL *s)
3246 {
3247 unsigned long alg_k;
3248 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3249 return 0;
3250 /* If no suitable signature algorithm can't use certificate */
3251 if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3252 return 0;
3253 /*
3254 * If strict mode check suitability of chain before using it. This also
3255 * adjusts suite B digest if necessary.
3256 */
3257 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3258 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3259 return 0;
3260 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3261 /* See if we can use client certificate for fixed DH */
3262 if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3263 SESS_CERT *scert = s->session->sess_cert;
3264 int i = scert->peer_cert_type;
3265 EVP_PKEY *clkey = NULL, *spkey = NULL;
3266 clkey = s->cert->key->privatekey;
3267 /* If client key not DH assume it can be used */
3268 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3269 return 1;
3270 if (i >= 0)
3271 spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3272 if (spkey) {
3273 /* Compare server and client parameters */
3274 i = EVP_PKEY_cmp_parameters(clkey, spkey);
3275 EVP_PKEY_free(spkey);
3276 if (i != 1)
3277 return 0;
3278 }
3279 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3280 }
3281 return 1;
3282 }
3283
3284 int ssl3_send_client_certificate(SSL *s)
3285 {
3286 X509 *x509 = NULL;
3287 EVP_PKEY *pkey = NULL;
3288 int i;
3289
3290 if (s->state == SSL3_ST_CW_CERT_A) {
3291 /* Let cert callback update client certificates if required */
3292 if (s->cert->cert_cb) {
3293 i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3294 if (i < 0) {
3295 s->rwstate = SSL_X509_LOOKUP;
3296 return -1;
3297 }
3298 if (i == 0) {
3299 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3300 return 0;
3301 }
3302 s->rwstate = SSL_NOTHING;
3303 }
3304 if (ssl3_check_client_certificate(s))
3305 s->state = SSL3_ST_CW_CERT_C;
3306 else
3307 s->state = SSL3_ST_CW_CERT_B;
3308 }
3309
3310 /* We need to get a client cert */
3311 if (s->state == SSL3_ST_CW_CERT_B) {
3312 /*
3313 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3314 * return(-1); We then get retied later
3315 */
3316 i = 0;
3317 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3318 if (i < 0) {
3319 s->rwstate = SSL_X509_LOOKUP;
3320 return (-1);
3321 }
3322 s->rwstate = SSL_NOTHING;
3323 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3324 s->state = SSL3_ST_CW_CERT_B;
3325 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3326 i = 0;
3327 } else if (i == 1) {
3328 i = 0;
3329 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
3330 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3331 }
3332
3333 X509_free(x509);
3334 if (pkey != NULL)
3335 EVP_PKEY_free(pkey);
3336 if (i && !ssl3_check_client_certificate(s))
3337 i = 0;
3338 if (i == 0) {
3339 if (s->version == SSL3_VERSION) {
3340 s->s3->tmp.cert_req = 0;
3341 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3342 return (1);
3343 } else {
3344 s->s3->tmp.cert_req = 2;
3345 }
3346 }
3347
3348 /* Ok, we have a cert */
3349 s->state = SSL3_ST_CW_CERT_C;
3350 }
3351
3352 if (s->state == SSL3_ST_CW_CERT_C) {
3353 s->state = SSL3_ST_CW_CERT_D;
3354 if (!ssl3_output_cert_chain(s,
3355 (s->s3->tmp.cert_req ==
3356 2) ? NULL : s->cert->key)) {
3357 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3358 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3359 return 0;
3360 }
3361 }
3362 /* SSL3_ST_CW_CERT_D */
3363 return ssl_do_write(s);
3364 }
3365
3366 #define has_bits(i,m) (((i)&(m)) == (m))
3367
3368 int ssl3_check_cert_and_algorithm(SSL *s)
3369 {
3370 int i, idx;
3371 long alg_k, alg_a;
3372 EVP_PKEY *pkey = NULL;
3373 SESS_CERT *sc;
3374 #ifndef OPENSSL_NO_RSA
3375 RSA *rsa;
3376 #endif
3377 #ifndef OPENSSL_NO_DH
3378 DH *dh;
3379 #endif
3380
3381 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3382 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3383
3384 /* we don't have a certificate */
3385 if ((alg_a & (SSL_aNULL | SSL_aKRB5)) || (alg_k & SSL_kPSK))
3386 return (1);
3387
3388 sc = s->session->sess_cert;
3389 if (sc == NULL) {
3390 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3391 goto err;
3392 }
3393 #ifndef OPENSSL_NO_RSA
3394 rsa = s->session->sess_cert->peer_rsa_tmp;
3395 #endif
3396 #ifndef OPENSSL_NO_DH
3397 dh = s->session->sess_cert->peer_dh_tmp;
3398 #endif
3399
3400 /* This is the passed certificate */
3401
3402 idx = sc->peer_cert_type;
3403 #ifndef OPENSSL_NO_EC
3404 if (idx == SSL_PKEY_ECC) {
3405 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) {
3406 /* check failed */
3407 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
3408 goto f_err;
3409 } else {
3410 return 1;
3411 }
3412 } else if (alg_a & SSL_aECDSA) {
3413 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3414 SSL_R_MISSING_ECDSA_SIGNING_CERT);
3415 goto f_err;
3416 } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
3417 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT);
3418 goto f_err;
3419 }
3420 #endif
3421 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
3422 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
3423 EVP_PKEY_free(pkey);
3424
3425 /* Check that we have a certificate if we require one */
3426 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
3427 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3428 SSL_R_MISSING_RSA_SIGNING_CERT);
3429 goto f_err;
3430 }
3431 #ifndef OPENSSL_NO_DSA
3432 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
3433 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3434 SSL_R_MISSING_DSA_SIGNING_CERT);
3435 goto f_err;
3436 }
3437 #endif
3438 #ifndef OPENSSL_NO_RSA
3439 if ((alg_k & SSL_kRSA) &&
3440 !(has_bits(i, EVP_PK_RSA | EVP_PKT_ENC) || (rsa != NULL))) {
3441 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3442 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3443 goto f_err;
3444 }
3445 #endif
3446 #ifndef OPENSSL_NO_DH
3447 if ((alg_k & SSL_kDHE) &&
3448 !(has_bits(i, EVP_PK_DH | EVP_PKT_EXCH) || (dh != NULL))) {
3449 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_KEY);
3450 goto f_err;
3451 } else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3452 !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
3453 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3454 SSL_R_MISSING_DH_RSA_CERT);
3455 goto f_err;
3456 }
3457 # ifndef OPENSSL_NO_DSA
3458 else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3459 !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
3460 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3461 SSL_R_MISSING_DH_DSA_CERT);
3462 goto f_err;
3463 }
3464 # endif
3465 #endif
3466
3467 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i, EVP_PKT_EXP)) {
3468 #ifndef OPENSSL_NO_RSA
3469 if (alg_k & SSL_kRSA) {
3470 if (rsa == NULL
3471 || RSA_size(rsa) * 8 >
3472 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3473 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3474 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3475 goto f_err;
3476 }
3477 } else
3478 #endif
3479 #ifndef OPENSSL_NO_DH
3480 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
3481 if (dh == NULL
3482 || DH_size(dh) * 8 >
3483 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3484 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3485 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3486 goto f_err;
3487 }
3488 } else
3489 #endif
3490 {
3491 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3492 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3493 goto f_err;
3494 }
3495 }
3496 return (1);
3497 f_err:
3498 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3499 err:
3500 return (0);
3501 }
3502
3503 #ifndef OPENSSL_NO_TLSEXT
3504 /*
3505 * Normally, we can tell if the server is resuming the session from
3506 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server
3507 * message after the ServerHello to determine if the server is resuming.
3508 * Therefore, we allow EAP-FAST to peek ahead.
3509 * ssl3_check_finished returns 1 if we are resuming from an external
3510 * pre-shared secret, we have a "ticket" and the next server handshake message
3511 * is Finished; and 0 otherwise. It returns -1 upon an error.
3512 */
3513 static int ssl3_check_finished(SSL *s)
3514 {
3515 int ok = 0;
3516
3517 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb ||
3518 !s->session->tlsext_tick)
3519 return 0;
3520
3521 /* Need to permit this temporarily, in case the next message is Finished. */
3522 s->s3->flags |= SSL3_FLAGS_CCS_OK;
3523 /*
3524 * This function is called when we might get a Certificate message instead,
3525 * so permit appropriate message length.
3526 * We ignore the return value as we're only interested in the message type
3527 * and not its length.
3528 */
3529 s->method->ssl_get_message(s,
3530 SSL3_ST_CR_CERT_A,
3531 SSL3_ST_CR_CERT_B,
3532 -1, s->max_cert_list, &ok);
3533 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
3534
3535 if (!ok)
3536 return -1;
3537
3538 s->s3->tmp.reuse_message = 1;
3539
3540 if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
3541 return 1;
3542
3543 /* If we're not done, then the CCS arrived early and we should bail. */
3544 if (s->s3->change_cipher_spec) {
3545 SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY);
3546 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
3547 return -1;
3548 }
3549
3550 return 0;
3551 }
3552
3553 # ifndef OPENSSL_NO_NEXTPROTONEG
3554 int ssl3_send_next_proto(SSL *s)
3555 {
3556 unsigned int len, padding_len;
3557 unsigned char *d;
3558
3559 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) {
3560 len = s->next_proto_negotiated_len;
3561 padding_len = 32 - ((len + 2) % 32);
3562 d = (unsigned char *)s->init_buf->data;
3563 d[4] = len;
3564 memcpy(d + 5, s->next_proto_negotiated, len);
3565 d[5 + len] = padding_len;
3566 memset(d + 6 + len, 0, padding_len);
3567 *(d++) = SSL3_MT_NEXT_PROTO;
3568 l2n3(2 + len + padding_len, d);
3569 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3570 s->init_num = 4 + 2 + len + padding_len;
3571 s->init_off = 0;
3572 }
3573
3574 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3575 }
3576 # endif
3577 #endif
3578
3579 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3580 {
3581 int i = 0;
3582 #ifndef OPENSSL_NO_ENGINE
3583 if (s->ctx->client_cert_engine) {
3584 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3585 SSL_get_client_CA_list(s),
3586 px509, ppkey, NULL, NULL, NULL);
3587 if (i != 0)
3588 return i;
3589 }
3590 #endif
3591 if (s->ctx->client_cert_cb)
3592 i = s->ctx->client_cert_cb(s, px509, ppkey);
3593 return i;
3594 }
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