1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124 /* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 # include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 # include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 # include <openssl/engine.h>
168 #endif
169
170 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
171 #ifndef OPENSSL_NO_TLSEXT
172 static int ssl3_check_finished(SSL *s);
173 #endif
174
175 #ifndef OPENSSL_NO_SSL3_METHOD
ssl3_get_client_method(int ver)176 static const SSL_METHOD *ssl3_get_client_method(int ver)
177 {
178 if (ver == SSL3_VERSION)
179 return (SSLv3_client_method());
180 else
181 return (NULL);
182 }
183
IMPLEMENT_ssl3_meth_func(SSLv3_client_method,ssl_undefined_function,ssl3_connect,ssl3_get_client_method)184 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
185 ssl_undefined_function,
186 ssl3_connect, ssl3_get_client_method)
187 #endif
188 int ssl3_connect(SSL *s)
189 {
190 BUF_MEM *buf = NULL;
191 unsigned long Time = (unsigned long)time(NULL);
192 void (*cb) (const SSL *ssl, int type, int val) = NULL;
193 int ret = -1;
194 int new_state, state, skip = 0;
195
196 RAND_add(&Time, sizeof(Time), 0);
197 ERR_clear_error();
198 clear_sys_error();
199
200 if (s->info_callback != NULL)
201 cb = s->info_callback;
202 else if (s->ctx->info_callback != NULL)
203 cb = s->ctx->info_callback;
204
205 s->in_handshake++;
206 if (!SSL_in_init(s) || SSL_in_before(s))
207 SSL_clear(s);
208
209 #ifndef OPENSSL_NO_HEARTBEATS
210 /*
211 * If we're awaiting a HeartbeatResponse, pretend we already got and
212 * don't await it anymore, because Heartbeats don't make sense during
213 * handshakes anyway.
214 */
215 if (s->tlsext_hb_pending) {
216 s->tlsext_hb_pending = 0;
217 s->tlsext_hb_seq++;
218 }
219 #endif
220
221 for (;;) {
222 state = s->state;
223
224 switch (s->state) {
225 case SSL_ST_RENEGOTIATE:
226 s->renegotiate = 1;
227 s->state = SSL_ST_CONNECT;
228 s->ctx->stats.sess_connect_renegotiate++;
229 /* break */
230 case SSL_ST_BEFORE:
231 case SSL_ST_CONNECT:
232 case SSL_ST_BEFORE | SSL_ST_CONNECT:
233 case SSL_ST_OK | SSL_ST_CONNECT:
234
235 s->server = 0;
236 if (cb != NULL)
237 cb(s, SSL_CB_HANDSHAKE_START, 1);
238
239 if ((s->version & 0xff00) != 0x0300) {
240 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
241 s->state = SSL_ST_ERR;
242 ret = -1;
243 goto end;
244 }
245
246 /* s->version=SSL3_VERSION; */
247 s->type = SSL_ST_CONNECT;
248
249 if (s->init_buf == NULL) {
250 if ((buf = BUF_MEM_new()) == NULL) {
251 ret = -1;
252 s->state = SSL_ST_ERR;
253 goto end;
254 }
255 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
256 ret = -1;
257 s->state = SSL_ST_ERR;
258 goto end;
259 }
260 s->init_buf = buf;
261 buf = NULL;
262 }
263
264 if (!ssl3_setup_buffers(s)) {
265 ret = -1;
266 goto end;
267 }
268
269 /* setup buffing BIO */
270 if (!ssl_init_wbio_buffer(s, 0)) {
271 ret = -1;
272 s->state = SSL_ST_ERR;
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 s->init_num = 0;
323 break;
324
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 s->state = SSL_ST_ERR;
381 goto end;
382 }
383 break;
384
385 case SSL3_ST_CR_CERT_REQ_A:
386 case SSL3_ST_CR_CERT_REQ_B:
387 ret = ssl3_get_certificate_request(s);
388 if (ret <= 0)
389 goto end;
390 s->state = SSL3_ST_CR_SRVR_DONE_A;
391 s->init_num = 0;
392 break;
393
394 case SSL3_ST_CR_SRVR_DONE_A:
395 case SSL3_ST_CR_SRVR_DONE_B:
396 ret = ssl3_get_server_done(s);
397 if (ret <= 0)
398 goto end;
399 #ifndef OPENSSL_NO_SRP
400 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
401 if ((ret = SRP_Calc_A_param(s)) <= 0) {
402 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC);
403 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
404 s->state = SSL_ST_ERR;
405 goto end;
406 }
407 }
408 #endif
409 if (s->s3->tmp.cert_req)
410 s->state = SSL3_ST_CW_CERT_A;
411 else
412 s->state = SSL3_ST_CW_KEY_EXCH_A;
413 s->init_num = 0;
414
415 break;
416
417 case SSL3_ST_CW_CERT_A:
418 case SSL3_ST_CW_CERT_B:
419 case SSL3_ST_CW_CERT_C:
420 case SSL3_ST_CW_CERT_D:
421 ret = ssl3_send_client_certificate(s);
422 if (ret <= 0)
423 goto end;
424 s->state = SSL3_ST_CW_KEY_EXCH_A;
425 s->init_num = 0;
426 break;
427
428 case SSL3_ST_CW_KEY_EXCH_A:
429 case SSL3_ST_CW_KEY_EXCH_B:
430 ret = ssl3_send_client_key_exchange(s);
431 if (ret <= 0)
432 goto end;
433 /*
434 * EAY EAY EAY need to check for DH fix cert sent back
435 */
436 /*
437 * For TLS, cert_req is set to 2, so a cert chain of nothing is
438 * sent, but no verify packet is sent
439 */
440 /*
441 * XXX: For now, we do not support client authentication in ECDH
442 * cipher suites with ECDH (rather than ECDSA) certificates. We
443 * need to skip the certificate verify message when client's
444 * ECDH public key is sent inside the client certificate.
445 */
446 if (s->s3->tmp.cert_req == 1) {
447 s->state = SSL3_ST_CW_CERT_VRFY_A;
448 } else {
449 s->state = SSL3_ST_CW_CHANGE_A;
450 }
451 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
452 s->state = SSL3_ST_CW_CHANGE_A;
453 }
454
455 s->init_num = 0;
456 break;
457
458 case SSL3_ST_CW_CERT_VRFY_A:
459 case SSL3_ST_CW_CERT_VRFY_B:
460 ret = ssl3_send_client_verify(s);
461 if (ret <= 0)
462 goto end;
463 s->state = SSL3_ST_CW_CHANGE_A;
464 s->init_num = 0;
465 break;
466
467 case SSL3_ST_CW_CHANGE_A:
468 case SSL3_ST_CW_CHANGE_B:
469 ret = ssl3_send_change_cipher_spec(s,
470 SSL3_ST_CW_CHANGE_A,
471 SSL3_ST_CW_CHANGE_B);
472 if (ret <= 0)
473 goto end;
474
475 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
476 s->state = SSL3_ST_CW_FINISHED_A;
477 #else
478 if (s->s3->next_proto_neg_seen)
479 s->state = SSL3_ST_CW_NEXT_PROTO_A;
480 else
481 s->state = SSL3_ST_CW_FINISHED_A;
482 #endif
483 s->init_num = 0;
484
485 s->session->cipher = s->s3->tmp.new_cipher;
486 #ifdef OPENSSL_NO_COMP
487 s->session->compress_meth = 0;
488 #else
489 if (s->s3->tmp.new_compression == NULL)
490 s->session->compress_meth = 0;
491 else
492 s->session->compress_meth = s->s3->tmp.new_compression->id;
493 #endif
494 if (!s->method->ssl3_enc->setup_key_block(s)) {
495 ret = -1;
496 s->state = SSL_ST_ERR;
497 goto end;
498 }
499
500 if (!s->method->ssl3_enc->change_cipher_state(s,
501 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
502 {
503 ret = -1;
504 s->state = SSL_ST_ERR;
505 goto end;
506 }
507
508 break;
509
510 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
511 case SSL3_ST_CW_NEXT_PROTO_A:
512 case SSL3_ST_CW_NEXT_PROTO_B:
513 ret = ssl3_send_next_proto(s);
514 if (ret <= 0)
515 goto end;
516 s->state = SSL3_ST_CW_FINISHED_A;
517 break;
518 #endif
519
520 case SSL3_ST_CW_FINISHED_A:
521 case SSL3_ST_CW_FINISHED_B:
522 ret = ssl3_send_finished(s,
523 SSL3_ST_CW_FINISHED_A,
524 SSL3_ST_CW_FINISHED_B,
525 s->method->
526 ssl3_enc->client_finished_label,
527 s->method->
528 ssl3_enc->client_finished_label_len);
529 if (ret <= 0)
530 goto end;
531 s->state = SSL3_ST_CW_FLUSH;
532
533 /* clear flags */
534 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
535 if (s->hit) {
536 s->s3->tmp.next_state = SSL_ST_OK;
537 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
538 s->state = SSL_ST_OK;
539 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
540 s->s3->delay_buf_pop_ret = 0;
541 }
542 } else {
543 #ifndef OPENSSL_NO_TLSEXT
544 /*
545 * Allow NewSessionTicket if ticket expected
546 */
547 if (s->tlsext_ticket_expected)
548 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
549 else
550 #endif
551
552 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
553 }
554 s->init_num = 0;
555 break;
556
557 #ifndef OPENSSL_NO_TLSEXT
558 case SSL3_ST_CR_SESSION_TICKET_A:
559 case SSL3_ST_CR_SESSION_TICKET_B:
560 ret = ssl3_get_new_session_ticket(s);
561 if (ret <= 0)
562 goto end;
563 s->state = SSL3_ST_CR_FINISHED_A;
564 s->init_num = 0;
565 break;
566
567 case SSL3_ST_CR_CERT_STATUS_A:
568 case SSL3_ST_CR_CERT_STATUS_B:
569 ret = ssl3_get_cert_status(s);
570 if (ret <= 0)
571 goto end;
572 s->state = SSL3_ST_CR_KEY_EXCH_A;
573 s->init_num = 0;
574 break;
575 #endif
576
577 case SSL3_ST_CR_FINISHED_A:
578 case SSL3_ST_CR_FINISHED_B:
579 if (!s->s3->change_cipher_spec)
580 s->s3->flags |= SSL3_FLAGS_CCS_OK;
581 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
582 SSL3_ST_CR_FINISHED_B);
583 if (ret <= 0)
584 goto end;
585
586 if (s->hit)
587 s->state = SSL3_ST_CW_CHANGE_A;
588 else
589 s->state = SSL_ST_OK;
590 s->init_num = 0;
591 break;
592
593 case SSL3_ST_CW_FLUSH:
594 s->rwstate = SSL_WRITING;
595 if (BIO_flush(s->wbio) <= 0) {
596 ret = -1;
597 goto end;
598 }
599 s->rwstate = SSL_NOTHING;
600 s->state = s->s3->tmp.next_state;
601 break;
602
603 case SSL_ST_OK:
604 /* clean a few things up */
605 ssl3_cleanup_key_block(s);
606
607 if (s->init_buf != NULL) {
608 BUF_MEM_free(s->init_buf);
609 s->init_buf = NULL;
610 }
611
612 /*
613 * If we are not 'joining' the last two packets, remove the
614 * buffering now
615 */
616 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
617 ssl_free_wbio_buffer(s);
618 /* else do it later in ssl3_write */
619
620 s->init_num = 0;
621 s->renegotiate = 0;
622 s->new_session = 0;
623
624 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
625 if (s->hit)
626 s->ctx->stats.sess_hit++;
627
628 ret = 1;
629 /* s->server=0; */
630 s->handshake_func = ssl3_connect;
631 s->ctx->stats.sess_connect_good++;
632
633 if (cb != NULL)
634 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
635
636 goto end;
637 /* break; */
638
639 case SSL_ST_ERR:
640 default:
641 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
642 ret = -1;
643 goto end;
644 /* break; */
645 }
646
647 /* did we do anything */
648 if (!s->s3->tmp.reuse_message && !skip) {
649 if (s->debug) {
650 if ((ret = BIO_flush(s->wbio)) <= 0)
651 goto end;
652 }
653
654 if ((cb != NULL) && (s->state != state)) {
655 new_state = s->state;
656 s->state = state;
657 cb(s, SSL_CB_CONNECT_LOOP, 1);
658 s->state = new_state;
659 }
660 }
661 skip = 0;
662 }
663 end:
664 s->in_handshake--;
665 if (buf != NULL)
666 BUF_MEM_free(buf);
667 if (cb != NULL)
668 cb(s, SSL_CB_CONNECT_EXIT, ret);
669 return (ret);
670 }
671
ssl3_client_hello(SSL * s)672 int ssl3_client_hello(SSL *s)
673 {
674 unsigned char *buf;
675 unsigned char *p, *d;
676 int i;
677 unsigned long l;
678 #ifndef OPENSSL_NO_COMP
679 int j;
680 SSL_COMP *comp;
681 #endif
682
683 buf = (unsigned char *)s->init_buf->data;
684 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
685 SSL_SESSION *sess = s->session;
686 if ((sess == NULL) || (sess->ssl_version != s->version) ||
687 #ifdef OPENSSL_NO_TLSEXT
688 !sess->session_id_length ||
689 #else
690 /*
691 * In the case of EAP-FAST, we can have a pre-shared
692 * "ticket" without a session ID.
693 */
694 (!sess->session_id_length && !sess->tlsext_tick) ||
695 #endif
696 (sess->not_resumable)) {
697 if (!ssl_get_new_session(s, 0))
698 goto err;
699 }
700 /* else use the pre-loaded session */
701
702 p = s->s3->client_random;
703
704 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
705 goto err;
706
707 /* Do the message type and length last */
708 d = p = &(buf[4]);
709
710 /*-
711 * version indicates the negotiated version: for example from
712 * an SSLv2/v3 compatible client hello). The client_version
713 * field is the maximum version we permit and it is also
714 * used in RSA encrypted premaster secrets. Some servers can
715 * choke if we initially report a higher version then
716 * renegotiate to a lower one in the premaster secret. This
717 * didn't happen with TLS 1.0 as most servers supported it
718 * but it can with TLS 1.1 or later if the server only supports
719 * 1.0.
720 *
721 * Possible scenario with previous logic:
722 * 1. Client hello indicates TLS 1.2
723 * 2. Server hello says TLS 1.0
724 * 3. RSA encrypted premaster secret uses 1.2.
725 * 4. Handhaked proceeds using TLS 1.0.
726 * 5. Server sends hello request to renegotiate.
727 * 6. Client hello indicates TLS v1.0 as we now
728 * know that is maximum server supports.
729 * 7. Server chokes on RSA encrypted premaster secret
730 * containing version 1.0.
731 *
732 * For interoperability it should be OK to always use the
733 * maximum version we support in client hello and then rely
734 * on the checking of version to ensure the servers isn't
735 * being inconsistent: for example initially negotiating with
736 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
737 * client_version in client hello and not resetting it to
738 * the negotiated version.
739 */
740 #if 0
741 *(p++) = s->version >> 8;
742 *(p++) = s->version & 0xff;
743 s->client_version = s->version;
744 #else
745 *(p++) = s->client_version >> 8;
746 *(p++) = s->client_version & 0xff;
747 #endif
748
749 /* Random stuff */
750 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
751 p += SSL3_RANDOM_SIZE;
752
753 /* Session ID */
754 if (s->new_session)
755 i = 0;
756 else
757 i = s->session->session_id_length;
758 *(p++) = i;
759 if (i != 0) {
760 if (i > (int)sizeof(s->session->session_id)) {
761 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
762 goto err;
763 }
764 memcpy(p, s->session->session_id, i);
765 p += i;
766 }
767
768 /* Ciphers supported */
769 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
770 if (i == 0) {
771 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
772 goto err;
773 }
774 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
775 /*
776 * Some servers hang if client hello > 256 bytes as hack workaround
777 * chop number of supported ciphers to keep it well below this if we
778 * use TLS v1.2
779 */
780 if (TLS1_get_version(s) >= TLS1_2_VERSION
781 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
782 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
783 #endif
784 s2n(i, p);
785 p += i;
786
787 /* COMPRESSION */
788 #ifdef OPENSSL_NO_COMP
789 *(p++) = 1;
790 #else
791
792 if ((s->options & SSL_OP_NO_COMPRESSION)
793 || !s->ctx->comp_methods)
794 j = 0;
795 else
796 j = sk_SSL_COMP_num(s->ctx->comp_methods);
797 *(p++) = 1 + j;
798 for (i = 0; i < j; i++) {
799 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
800 *(p++) = comp->id;
801 }
802 #endif
803 *(p++) = 0; /* Add the NULL method */
804
805 #ifndef OPENSSL_NO_TLSEXT
806 /* TLS extensions */
807 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
808 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
809 goto err;
810 }
811 if ((p =
812 ssl_add_clienthello_tlsext(s, p,
813 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
814 NULL) {
815 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
816 goto err;
817 }
818 #endif
819
820 l = (p - d);
821 d = buf;
822 *(d++) = SSL3_MT_CLIENT_HELLO;
823 l2n3(l, d);
824
825 s->state = SSL3_ST_CW_CLNT_HELLO_B;
826 /* number of bytes to write */
827 s->init_num = p - buf;
828 s->init_off = 0;
829 }
830
831 /* SSL3_ST_CW_CLNT_HELLO_B */
832 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
833 err:
834 s->state = SSL_ST_ERR;
835 return (-1);
836 }
837
ssl3_get_server_hello(SSL * s)838 int ssl3_get_server_hello(SSL *s)
839 {
840 STACK_OF(SSL_CIPHER) *sk;
841 const SSL_CIPHER *c;
842 unsigned char *p, *d;
843 int i, al, ok;
844 unsigned int j;
845 long n;
846 #ifndef OPENSSL_NO_COMP
847 SSL_COMP *comp;
848 #endif
849
850 n = s->method->ssl_get_message(s,
851 SSL3_ST_CR_SRVR_HELLO_A,
852 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
853
854 if (!ok)
855 return ((int)n);
856
857 if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) {
858 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
859 if (s->d1->send_cookie == 0) {
860 s->s3->tmp.reuse_message = 1;
861 return 1;
862 } else { /* already sent a cookie */
863
864 al = SSL_AD_UNEXPECTED_MESSAGE;
865 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
866 goto f_err;
867 }
868 }
869 }
870
871 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
872 al = SSL_AD_UNEXPECTED_MESSAGE;
873 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
874 goto f_err;
875 }
876
877 d = p = (unsigned char *)s->init_msg;
878
879 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
880 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
881 s->version = (s->version & 0xff00) | p[1];
882 al = SSL_AD_PROTOCOL_VERSION;
883 goto f_err;
884 }
885 p += 2;
886
887 /* load the server hello data */
888 /* load the server random */
889 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
890 p += SSL3_RANDOM_SIZE;
891
892 s->hit = 0;
893
894 /* get the session-id */
895 j = *(p++);
896
897 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
898 al = SSL_AD_ILLEGAL_PARAMETER;
899 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
900 goto f_err;
901 }
902 #ifndef OPENSSL_NO_TLSEXT
903 /*
904 * Check if we can resume the session based on external pre-shared secret.
905 * EAP-FAST (RFC 4851) supports two types of session resumption.
906 * Resumption based on server-side state works with session IDs.
907 * Resumption based on pre-shared Protected Access Credentials (PACs)
908 * works by overriding the SessionTicket extension at the application
909 * layer, and does not send a session ID. (We do not know whether EAP-FAST
910 * servers would honour the session ID.) Therefore, the session ID alone
911 * is not a reliable indicator of session resumption, so we first check if
912 * we can resume, and later peek at the next handshake message to see if the
913 * server wants to resume.
914 */
915 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb &&
916 s->session->tlsext_tick) {
917 SSL_CIPHER *pref_cipher = NULL;
918 s->session->master_key_length = sizeof(s->session->master_key);
919 if (s->tls_session_secret_cb(s, s->session->master_key,
920 &s->session->master_key_length,
921 NULL, &pref_cipher,
922 s->tls_session_secret_cb_arg)) {
923 s->session->cipher = pref_cipher ?
924 pref_cipher : ssl_get_cipher_by_char(s, p + j);
925 } else {
926 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
927 al = SSL_AD_INTERNAL_ERROR;
928 goto f_err;
929 }
930 }
931 #endif /* OPENSSL_NO_TLSEXT */
932
933 if (j != 0 && j == s->session->session_id_length
934 && memcmp(p, s->session->session_id, j) == 0) {
935 if (s->sid_ctx_length != s->session->sid_ctx_length
936 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
937 /* actually a client application bug */
938 al = SSL_AD_ILLEGAL_PARAMETER;
939 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
940 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
941 goto f_err;
942 }
943 s->hit = 1;
944 } else {
945 /*
946 * If we were trying for session-id reuse but the server
947 * didn't echo the ID, make a new SSL_SESSION.
948 * In the case of EAP-FAST and PAC, we do not send a session ID,
949 * so the PAC-based session secret is always preserved. It'll be
950 * overwritten if the server refuses resumption.
951 */
952 if (s->session->session_id_length > 0) {
953 if (!ssl_get_new_session(s, 0)) {
954 al = SSL_AD_INTERNAL_ERROR;
955 goto f_err;
956 }
957 }
958 s->session->session_id_length = j;
959 memcpy(s->session->session_id, p, j); /* j could be 0 */
960 }
961 p += j;
962 c = ssl_get_cipher_by_char(s, p);
963 if (c == NULL) {
964 /* unknown cipher */
965 al = SSL_AD_ILLEGAL_PARAMETER;
966 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
967 goto f_err;
968 }
969 /* TLS v1.2 only ciphersuites require v1.2 or later */
970 if ((c->algorithm_ssl & SSL_TLSV1_2) &&
971 (TLS1_get_version(s) < TLS1_2_VERSION)) {
972 al = SSL_AD_ILLEGAL_PARAMETER;
973 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
974 goto f_err;
975 }
976 #ifndef OPENSSL_NO_SRP
977 if (((c->algorithm_mkey & SSL_kSRP) || (c->algorithm_auth & SSL_aSRP)) &&
978 !(s->srp_ctx.srp_Mask & SSL_kSRP)) {
979 al = SSL_AD_ILLEGAL_PARAMETER;
980 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
981 goto f_err;
982 }
983 #endif /* OPENSSL_NO_SRP */
984 p += ssl_put_cipher_by_char(s, NULL, NULL);
985
986 sk = ssl_get_ciphers_by_id(s);
987 i = sk_SSL_CIPHER_find(sk, c);
988 if (i < 0) {
989 /* we did not say we would use this cipher */
990 al = SSL_AD_ILLEGAL_PARAMETER;
991 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
992 goto f_err;
993 }
994
995 /*
996 * Depending on the session caching (internal/external), the cipher
997 * and/or cipher_id values may not be set. Make sure that cipher_id is
998 * set and use it for comparison.
999 */
1000 if (s->session->cipher)
1001 s->session->cipher_id = s->session->cipher->id;
1002 if (s->hit && (s->session->cipher_id != c->id)) {
1003 /* Workaround is now obsolete */
1004 #if 0
1005 if (!(s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1006 #endif
1007 {
1008 al = SSL_AD_ILLEGAL_PARAMETER;
1009 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1010 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1011 goto f_err;
1012 }
1013 }
1014 s->s3->tmp.new_cipher = c;
1015 /*
1016 * Don't digest cached records if TLS v1.2: we may need them for client
1017 * authentication.
1018 */
1019 if (TLS1_get_version(s) < TLS1_2_VERSION
1020 && !ssl3_digest_cached_records(s)) {
1021 al = SSL_AD_INTERNAL_ERROR;
1022 goto f_err;
1023 }
1024 /* lets get the compression algorithm */
1025 /* COMPRESSION */
1026 #ifdef OPENSSL_NO_COMP
1027 if (*(p++) != 0) {
1028 al = SSL_AD_ILLEGAL_PARAMETER;
1029 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1030 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1031 goto f_err;
1032 }
1033 /*
1034 * If compression is disabled we'd better not try to resume a session
1035 * using compression.
1036 */
1037 if (s->session->compress_meth != 0) {
1038 al = SSL_AD_INTERNAL_ERROR;
1039 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1040 goto f_err;
1041 }
1042 #else
1043 j = *(p++);
1044 if (s->hit && j != s->session->compress_meth) {
1045 al = SSL_AD_ILLEGAL_PARAMETER;
1046 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1047 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1048 goto f_err;
1049 }
1050 if (j == 0)
1051 comp = NULL;
1052 else if (s->options & SSL_OP_NO_COMPRESSION) {
1053 al = SSL_AD_ILLEGAL_PARAMETER;
1054 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
1055 goto f_err;
1056 } else
1057 comp = ssl3_comp_find(s->ctx->comp_methods, j);
1058
1059 if ((j != 0) && (comp == NULL)) {
1060 al = SSL_AD_ILLEGAL_PARAMETER;
1061 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1062 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1063 goto f_err;
1064 } else {
1065 s->s3->tmp.new_compression = comp;
1066 }
1067 #endif
1068
1069 #ifndef OPENSSL_NO_TLSEXT
1070 /* TLS extensions */
1071 if (s->version >= SSL3_VERSION) {
1072 if (!ssl_parse_serverhello_tlsext(s, &p, d, n, &al)) {
1073 /* 'al' set by ssl_parse_serverhello_tlsext */
1074 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
1075 goto f_err;
1076 }
1077 if (ssl_check_serverhello_tlsext(s) <= 0) {
1078 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
1079 goto err;
1080 }
1081 }
1082 #endif
1083
1084 if (p != (d + n)) {
1085 /* wrong packet length */
1086 al = SSL_AD_DECODE_ERROR;
1087 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
1088 goto f_err;
1089 }
1090
1091 return (1);
1092 f_err:
1093 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1094 err:
1095 s->state = SSL_ST_ERR;
1096 return (-1);
1097 }
1098
ssl3_get_server_certificate(SSL * s)1099 int ssl3_get_server_certificate(SSL *s)
1100 {
1101 int al, i, ok, ret = -1;
1102 unsigned long n, nc, llen, l;
1103 X509 *x = NULL;
1104 const unsigned char *q, *p;
1105 unsigned char *d;
1106 STACK_OF(X509) *sk = NULL;
1107 SESS_CERT *sc;
1108 EVP_PKEY *pkey = NULL;
1109 int need_cert = 1; /* VRS: 0=> will allow null cert if auth ==
1110 * KRB5 */
1111
1112 n = s->method->ssl_get_message(s,
1113 SSL3_ST_CR_CERT_A,
1114 SSL3_ST_CR_CERT_B,
1115 -1, s->max_cert_list, &ok);
1116
1117 if (!ok)
1118 return ((int)n);
1119
1120 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1121 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1122 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) {
1123 s->s3->tmp.reuse_message = 1;
1124 return (1);
1125 }
1126
1127 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1128 al = SSL_AD_UNEXPECTED_MESSAGE;
1129 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
1130 goto f_err;
1131 }
1132 p = d = (unsigned char *)s->init_msg;
1133
1134 if ((sk = sk_X509_new_null()) == NULL) {
1135 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1136 goto err;
1137 }
1138
1139 n2l3(p, llen);
1140 if (llen + 3 != n) {
1141 al = SSL_AD_DECODE_ERROR;
1142 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
1143 goto f_err;
1144 }
1145 for (nc = 0; nc < llen;) {
1146 n2l3(p, l);
1147 if ((l + nc + 3) > llen) {
1148 al = SSL_AD_DECODE_ERROR;
1149 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1150 SSL_R_CERT_LENGTH_MISMATCH);
1151 goto f_err;
1152 }
1153
1154 q = p;
1155 x = d2i_X509(NULL, &q, l);
1156 if (x == NULL) {
1157 al = SSL_AD_BAD_CERTIFICATE;
1158 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
1159 goto f_err;
1160 }
1161 if (q != (p + l)) {
1162 al = SSL_AD_DECODE_ERROR;
1163 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1164 SSL_R_CERT_LENGTH_MISMATCH);
1165 goto f_err;
1166 }
1167 if (!sk_X509_push(sk, x)) {
1168 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1169 goto err;
1170 }
1171 x = NULL;
1172 nc += l + 3;
1173 p = q;
1174 }
1175
1176 i = ssl_verify_cert_chain(s, sk);
1177 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1178 #ifndef OPENSSL_NO_KRB5
1179 && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1180 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1181 #endif /* OPENSSL_NO_KRB5 */
1182 ) {
1183 al = ssl_verify_alarm_type(s->verify_result);
1184 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1185 SSL_R_CERTIFICATE_VERIFY_FAILED);
1186 goto f_err;
1187 }
1188 ERR_clear_error(); /* but we keep s->verify_result */
1189
1190 sc = ssl_sess_cert_new();
1191 if (sc == NULL)
1192 goto err;
1193
1194 if (s->session->sess_cert)
1195 ssl_sess_cert_free(s->session->sess_cert);
1196 s->session->sess_cert = sc;
1197
1198 sc->cert_chain = sk;
1199 /*
1200 * Inconsistency alert: cert_chain does include the peer's certificate,
1201 * which we don't include in s3_srvr.c
1202 */
1203 x = sk_X509_value(sk, 0);
1204 sk = NULL;
1205 /*
1206 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1207 */
1208
1209 pkey = X509_get_pubkey(x);
1210
1211 /* VRS: allow null cert if auth == KRB5 */
1212 need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1213 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1214 ? 0 : 1;
1215
1216 #ifdef KSSL_DEBUG
1217 fprintf(stderr, "pkey,x = %p, %p\n", pkey, x);
1218 fprintf(stderr, "ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey));
1219 fprintf(stderr, "cipher, alg, nc = %s, %lx, %lx, %d\n",
1220 s->s3->tmp.new_cipher->name,
1221 s->s3->tmp.new_cipher->algorithm_mkey,
1222 s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1223 #endif /* KSSL_DEBUG */
1224
1225 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) {
1226 x = NULL;
1227 al = SSL3_AL_FATAL;
1228 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1229 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1230 goto f_err;
1231 }
1232
1233 i = ssl_cert_type(x, pkey);
1234 if (need_cert && i < 0) {
1235 x = NULL;
1236 al = SSL3_AL_FATAL;
1237 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1238 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1239 goto f_err;
1240 }
1241
1242 if (need_cert) {
1243 sc->peer_cert_type = i;
1244 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1245 /*
1246 * Why would the following ever happen? We just created sc a couple
1247 * of lines ago.
1248 */
1249 if (sc->peer_pkeys[i].x509 != NULL)
1250 X509_free(sc->peer_pkeys[i].x509);
1251 sc->peer_pkeys[i].x509 = x;
1252 sc->peer_key = &(sc->peer_pkeys[i]);
1253
1254 if (s->session->peer != NULL)
1255 X509_free(s->session->peer);
1256 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1257 s->session->peer = x;
1258 } else {
1259 sc->peer_cert_type = i;
1260 sc->peer_key = NULL;
1261
1262 if (s->session->peer != NULL)
1263 X509_free(s->session->peer);
1264 s->session->peer = NULL;
1265 }
1266 s->session->verify_result = s->verify_result;
1267
1268 x = NULL;
1269 ret = 1;
1270
1271 if (0) {
1272 f_err:
1273 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1274 err:
1275 s->state = SSL_ST_ERR;
1276 }
1277
1278 EVP_PKEY_free(pkey);
1279 X509_free(x);
1280 sk_X509_pop_free(sk, X509_free);
1281 return (ret);
1282 }
1283
ssl3_get_key_exchange(SSL * s)1284 int ssl3_get_key_exchange(SSL *s)
1285 {
1286 #ifndef OPENSSL_NO_RSA
1287 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1288 #endif
1289 EVP_MD_CTX md_ctx;
1290 unsigned char *param, *p;
1291 int al, j, ok;
1292 long i, param_len, n, alg_k, alg_a;
1293 EVP_PKEY *pkey = NULL;
1294 const EVP_MD *md = NULL;
1295 #ifndef OPENSSL_NO_RSA
1296 RSA *rsa = NULL;
1297 #endif
1298 #ifndef OPENSSL_NO_DH
1299 DH *dh = NULL;
1300 #endif
1301 #ifndef OPENSSL_NO_ECDH
1302 EC_KEY *ecdh = NULL;
1303 BN_CTX *bn_ctx = NULL;
1304 EC_POINT *srvr_ecpoint = NULL;
1305 int curve_nid = 0;
1306 int encoded_pt_len = 0;
1307 #endif
1308
1309 EVP_MD_CTX_init(&md_ctx);
1310
1311 /*
1312 * use same message size as in ssl3_get_certificate_request() as
1313 * ServerKeyExchange message may be skipped
1314 */
1315 n = s->method->ssl_get_message(s,
1316 SSL3_ST_CR_KEY_EXCH_A,
1317 SSL3_ST_CR_KEY_EXCH_B,
1318 -1, s->max_cert_list, &ok);
1319 if (!ok)
1320 return ((int)n);
1321
1322 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1323
1324 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1325 /*
1326 * Can't skip server key exchange if this is an ephemeral
1327 * ciphersuite.
1328 */
1329 if (alg_k & (SSL_kEDH | SSL_kEECDH)) {
1330 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1331 al = SSL_AD_UNEXPECTED_MESSAGE;
1332 goto f_err;
1333 }
1334 #ifndef OPENSSL_NO_PSK
1335 /*
1336 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no
1337 * identity hint is sent. Set session->sess_cert anyway to avoid
1338 * problems later.
1339 */
1340 if (alg_k & SSL_kPSK) {
1341 s->session->sess_cert = ssl_sess_cert_new();
1342 if (s->ctx->psk_identity_hint)
1343 OPENSSL_free(s->ctx->psk_identity_hint);
1344 s->ctx->psk_identity_hint = NULL;
1345 }
1346 #endif
1347 s->s3->tmp.reuse_message = 1;
1348 return (1);
1349 }
1350
1351 param = p = (unsigned char *)s->init_msg;
1352 if (s->session->sess_cert != NULL) {
1353 #ifndef OPENSSL_NO_RSA
1354 if (s->session->sess_cert->peer_rsa_tmp != NULL) {
1355 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1356 s->session->sess_cert->peer_rsa_tmp = NULL;
1357 }
1358 #endif
1359 #ifndef OPENSSL_NO_DH
1360 if (s->session->sess_cert->peer_dh_tmp) {
1361 DH_free(s->session->sess_cert->peer_dh_tmp);
1362 s->session->sess_cert->peer_dh_tmp = NULL;
1363 }
1364 #endif
1365 #ifndef OPENSSL_NO_ECDH
1366 if (s->session->sess_cert->peer_ecdh_tmp) {
1367 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1368 s->session->sess_cert->peer_ecdh_tmp = NULL;
1369 }
1370 #endif
1371 } else {
1372 s->session->sess_cert = ssl_sess_cert_new();
1373 }
1374
1375 /* Total length of the parameters including the length prefix */
1376 param_len = 0;
1377
1378 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1379
1380 al = SSL_AD_DECODE_ERROR;
1381
1382 #ifndef OPENSSL_NO_PSK
1383 if (alg_k & SSL_kPSK) {
1384 char tmp_id_hint[PSK_MAX_IDENTITY_LEN + 1];
1385
1386 param_len = 2;
1387 if (param_len > n) {
1388 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1389 goto f_err;
1390 }
1391 n2s(p, i);
1392
1393 /*
1394 * Store PSK identity hint for later use, hint is used in
1395 * ssl3_send_client_key_exchange. Assume that the maximum length of
1396 * a PSK identity hint can be as long as the maximum length of a PSK
1397 * identity.
1398 */
1399 if (i > PSK_MAX_IDENTITY_LEN) {
1400 al = SSL_AD_HANDSHAKE_FAILURE;
1401 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
1402 goto f_err;
1403 }
1404 if (i > n - param_len) {
1405 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1406 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1407 goto f_err;
1408 }
1409 param_len += i;
1410
1411 /*
1412 * If received PSK identity hint contains NULL characters, the hint
1413 * is truncated from the first NULL. p may not be ending with NULL,
1414 * so create a NULL-terminated string.
1415 */
1416 memcpy(tmp_id_hint, p, i);
1417 memset(tmp_id_hint + i, 0, PSK_MAX_IDENTITY_LEN + 1 - i);
1418 if (s->ctx->psk_identity_hint != NULL)
1419 OPENSSL_free(s->ctx->psk_identity_hint);
1420 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1421 if (s->ctx->psk_identity_hint == NULL) {
1422 al = SSL_AD_HANDSHAKE_FAILURE;
1423 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1424 goto f_err;
1425 }
1426
1427 p += i;
1428 n -= param_len;
1429 } else
1430 #endif /* !OPENSSL_NO_PSK */
1431 #ifndef OPENSSL_NO_SRP
1432 if (alg_k & SSL_kSRP) {
1433 param_len = 2;
1434 if (param_len > n) {
1435 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1436 goto f_err;
1437 }
1438 n2s(p, i);
1439
1440 if (i > n - param_len) {
1441 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
1442 goto f_err;
1443 }
1444 param_len += i;
1445
1446 if (!(s->srp_ctx.N = BN_bin2bn(p, i, NULL))) {
1447 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1448 goto err;
1449 }
1450 p += i;
1451
1452 if (2 > n - param_len) {
1453 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1454 goto f_err;
1455 }
1456 param_len += 2;
1457
1458 n2s(p, i);
1459
1460 if (i > n - param_len) {
1461 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
1462 goto f_err;
1463 }
1464 param_len += i;
1465
1466 if (!(s->srp_ctx.g = BN_bin2bn(p, i, NULL))) {
1467 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1468 goto err;
1469 }
1470 p += i;
1471
1472 if (1 > n - param_len) {
1473 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1474 goto f_err;
1475 }
1476 param_len += 1;
1477
1478 i = (unsigned int)(p[0]);
1479 p++;
1480
1481 if (i > n - param_len) {
1482 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
1483 goto f_err;
1484 }
1485 param_len += i;
1486
1487 if (!(s->srp_ctx.s = BN_bin2bn(p, i, NULL))) {
1488 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1489 goto err;
1490 }
1491 p += i;
1492
1493 if (2 > n - param_len) {
1494 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1495 goto f_err;
1496 }
1497 param_len += 2;
1498
1499 n2s(p, i);
1500
1501 if (i > n - param_len) {
1502 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
1503 goto f_err;
1504 }
1505 param_len += i;
1506
1507 if (!(s->srp_ctx.B = BN_bin2bn(p, i, NULL))) {
1508 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1509 goto err;
1510 }
1511 p += i;
1512 n -= param_len;
1513
1514 if (!srp_verify_server_param(s, &al)) {
1515 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
1516 goto f_err;
1517 }
1518
1519 /* We must check if there is a certificate */
1520 # ifndef OPENSSL_NO_RSA
1521 if (alg_a & SSL_aRSA)
1522 pkey =
1523 X509_get_pubkey(s->session->
1524 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1525 # else
1526 if (0) ;
1527 # endif
1528 # ifndef OPENSSL_NO_DSA
1529 else if (alg_a & SSL_aDSS)
1530 pkey =
1531 X509_get_pubkey(s->session->
1532 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1533 x509);
1534 # endif
1535 } else
1536 #endif /* !OPENSSL_NO_SRP */
1537 #ifndef OPENSSL_NO_RSA
1538 if (alg_k & SSL_kRSA) {
1539 /* Temporary RSA keys only allowed in export ciphersuites */
1540 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1541 al = SSL_AD_UNEXPECTED_MESSAGE;
1542 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1543 goto f_err;
1544 }
1545 if ((rsa = RSA_new()) == NULL) {
1546 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1547 goto err;
1548 }
1549
1550 param_len = 2;
1551 if (param_len > n) {
1552 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1553 goto f_err;
1554 }
1555 n2s(p, i);
1556
1557 if (i > n - param_len) {
1558 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1559 goto f_err;
1560 }
1561 param_len += i;
1562
1563 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) {
1564 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1565 goto err;
1566 }
1567 p += i;
1568
1569 if (2 > n - param_len) {
1570 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1571 goto f_err;
1572 }
1573 param_len += 2;
1574
1575 n2s(p, i);
1576
1577 if (i > n - param_len) {
1578 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1579 goto f_err;
1580 }
1581 param_len += i;
1582
1583 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) {
1584 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1585 goto err;
1586 }
1587 p += i;
1588 n -= param_len;
1589
1590 /* this should be because we are using an export cipher */
1591 if (alg_a & SSL_aRSA)
1592 pkey =
1593 X509_get_pubkey(s->session->
1594 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1595 else {
1596 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1597 goto err;
1598 }
1599
1600 if (EVP_PKEY_bits(pkey) <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
1601 al = SSL_AD_UNEXPECTED_MESSAGE;
1602 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1603 goto f_err;
1604 }
1605
1606 s->session->sess_cert->peer_rsa_tmp = rsa;
1607 rsa = NULL;
1608 }
1609 #else /* OPENSSL_NO_RSA */
1610 if (0) ;
1611 #endif
1612 #ifndef OPENSSL_NO_DH
1613 else if (alg_k & SSL_kEDH) {
1614 if ((dh = DH_new()) == NULL) {
1615 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1616 goto err;
1617 }
1618
1619 param_len = 2;
1620 if (param_len > n) {
1621 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1622 goto f_err;
1623 }
1624 n2s(p, i);
1625
1626 if (i > n - param_len) {
1627 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1628 goto f_err;
1629 }
1630 param_len += i;
1631
1632 if (!(dh->p = BN_bin2bn(p, i, NULL))) {
1633 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1634 goto err;
1635 }
1636 p += i;
1637
1638 if (2 > n - param_len) {
1639 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1640 goto f_err;
1641 }
1642 param_len += 2;
1643
1644 n2s(p, i);
1645
1646 if (i > n - param_len) {
1647 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1648 goto f_err;
1649 }
1650 param_len += i;
1651
1652 if (!(dh->g = BN_bin2bn(p, i, NULL))) {
1653 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1654 goto err;
1655 }
1656 p += i;
1657
1658 if (2 > n - param_len) {
1659 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1660 goto f_err;
1661 }
1662 param_len += 2;
1663
1664 n2s(p, i);
1665
1666 if (i > n - param_len) {
1667 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1668 goto f_err;
1669 }
1670 param_len += i;
1671
1672 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) {
1673 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1674 goto err;
1675 }
1676 p += i;
1677 n -= param_len;
1678
1679 # ifndef OPENSSL_NO_RSA
1680 if (alg_a & SSL_aRSA)
1681 pkey =
1682 X509_get_pubkey(s->session->
1683 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1684 # else
1685 if (0) ;
1686 # endif
1687 # ifndef OPENSSL_NO_DSA
1688 else if (alg_a & SSL_aDSS)
1689 pkey =
1690 X509_get_pubkey(s->session->
1691 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1692 x509);
1693 # endif
1694 /* else anonymous DH, so no certificate or pkey. */
1695
1696 s->session->sess_cert->peer_dh_tmp = dh;
1697 dh = NULL;
1698 } else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd)) {
1699 al = SSL_AD_ILLEGAL_PARAMETER;
1700 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1701 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1702 goto f_err;
1703 }
1704 #endif /* !OPENSSL_NO_DH */
1705
1706 #ifndef OPENSSL_NO_ECDH
1707 else if (alg_k & SSL_kEECDH) {
1708 EC_GROUP *ngroup;
1709 const EC_GROUP *group;
1710
1711 if ((ecdh = EC_KEY_new()) == NULL) {
1712 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1713 goto err;
1714 }
1715
1716 /*
1717 * Extract elliptic curve parameters and the server's ephemeral ECDH
1718 * public key. Keep accumulating lengths of various components in
1719 * param_len and make sure it never exceeds n.
1720 */
1721
1722 /*
1723 * XXX: For now we only support named (not generic) curves and the
1724 * ECParameters in this case is just three bytes. We also need one
1725 * byte for the length of the encoded point
1726 */
1727 param_len = 4;
1728 if (param_len > n) {
1729 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1730 goto f_err;
1731 }
1732
1733 if ((*p != NAMED_CURVE_TYPE) ||
1734 ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) {
1735 al = SSL_AD_INTERNAL_ERROR;
1736 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1737 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1738 goto f_err;
1739 }
1740
1741 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1742 if (ngroup == NULL) {
1743 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1744 goto err;
1745 }
1746 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1747 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1748 goto err;
1749 }
1750 EC_GROUP_free(ngroup);
1751
1752 group = EC_KEY_get0_group(ecdh);
1753
1754 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1755 (EC_GROUP_get_degree(group) > 163)) {
1756 al = SSL_AD_EXPORT_RESTRICTION;
1757 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1758 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1759 goto f_err;
1760 }
1761
1762 p += 3;
1763
1764 /* Next, get the encoded ECPoint */
1765 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1766 ((bn_ctx = BN_CTX_new()) == NULL)) {
1767 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1768 goto err;
1769 }
1770
1771 encoded_pt_len = *p; /* length of encoded point */
1772 p += 1;
1773
1774 if ((encoded_pt_len > n - param_len) ||
1775 (EC_POINT_oct2point(group, srvr_ecpoint,
1776 p, encoded_pt_len, bn_ctx) == 0)) {
1777 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1778 goto f_err;
1779 }
1780 param_len += encoded_pt_len;
1781
1782 n -= param_len;
1783 p += encoded_pt_len;
1784
1785 /*
1786 * The ECC/TLS specification does not mention the use of DSA to sign
1787 * ECParameters in the server key exchange message. We do support RSA
1788 * and ECDSA.
1789 */
1790 if (0) ;
1791 # ifndef OPENSSL_NO_RSA
1792 else if (alg_a & SSL_aRSA)
1793 pkey =
1794 X509_get_pubkey(s->session->
1795 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1796 # endif
1797 # ifndef OPENSSL_NO_ECDSA
1798 else if (alg_a & SSL_aECDSA)
1799 pkey =
1800 X509_get_pubkey(s->session->
1801 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1802 # endif
1803 /* else anonymous ECDH, so no certificate or pkey. */
1804 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1805 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1806 ecdh = NULL;
1807 BN_CTX_free(bn_ctx);
1808 bn_ctx = NULL;
1809 EC_POINT_free(srvr_ecpoint);
1810 srvr_ecpoint = NULL;
1811 } else if (alg_k) {
1812 al = SSL_AD_UNEXPECTED_MESSAGE;
1813 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1814 goto f_err;
1815 }
1816 #endif /* !OPENSSL_NO_ECDH */
1817
1818 /* p points to the next byte, there are 'n' bytes left */
1819
1820 /* if it was signed, check the signature */
1821 if (pkey != NULL) {
1822 if (TLS1_get_version(s) >= TLS1_2_VERSION) {
1823 int sigalg;
1824 if (2 > n) {
1825 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1826 goto f_err;
1827 }
1828
1829 sigalg = tls12_get_sigid(pkey);
1830 /* Should never happen */
1831 if (sigalg == -1) {
1832 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1833 goto err;
1834 }
1835 /* Check key type is consistent with signature */
1836 if (sigalg != (int)p[1]) {
1837 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1838 SSL_R_WRONG_SIGNATURE_TYPE);
1839 al = SSL_AD_DECODE_ERROR;
1840 goto f_err;
1841 }
1842 md = tls12_get_hash(p[0]);
1843 if (md == NULL) {
1844 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNKNOWN_DIGEST);
1845 goto f_err;
1846 }
1847 #ifdef SSL_DEBUG
1848 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1849 #endif
1850 p += 2;
1851 n -= 2;
1852 } else
1853 md = EVP_sha1();
1854
1855 if (2 > n) {
1856 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1857 goto f_err;
1858 }
1859 n2s(p, i);
1860 n -= 2;
1861 j = EVP_PKEY_size(pkey);
1862
1863 /*
1864 * Check signature length. If n is 0 then signature is empty
1865 */
1866 if ((i != n) || (n > j) || (n <= 0)) {
1867 /* wrong packet length */
1868 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1869 goto f_err;
1870 }
1871 #ifndef OPENSSL_NO_RSA
1872 if (pkey->type == EVP_PKEY_RSA
1873 && TLS1_get_version(s) < TLS1_2_VERSION) {
1874 int num;
1875 unsigned int size;
1876
1877 j = 0;
1878 q = md_buf;
1879 for (num = 2; num > 0; num--) {
1880 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1881 EVP_DigestInit_ex(&md_ctx, (num == 2)
1882 ? s->ctx->md5 : s->ctx->sha1, NULL);
1883 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1884 SSL3_RANDOM_SIZE);
1885 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1886 SSL3_RANDOM_SIZE);
1887 EVP_DigestUpdate(&md_ctx, param, param_len);
1888 EVP_DigestFinal_ex(&md_ctx, q, &size);
1889 q += size;
1890 j += size;
1891 }
1892 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
1893 if (i < 0) {
1894 al = SSL_AD_DECRYPT_ERROR;
1895 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
1896 goto f_err;
1897 }
1898 if (i == 0) {
1899 /* bad signature */
1900 al = SSL_AD_DECRYPT_ERROR;
1901 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1902 goto f_err;
1903 }
1904 } else
1905 #endif
1906 {
1907 EVP_VerifyInit_ex(&md_ctx, md, NULL);
1908 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1909 SSL3_RANDOM_SIZE);
1910 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1911 SSL3_RANDOM_SIZE);
1912 EVP_VerifyUpdate(&md_ctx, param, param_len);
1913 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1914 /* bad signature */
1915 al = SSL_AD_DECRYPT_ERROR;
1916 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1917 goto f_err;
1918 }
1919 }
1920 } else {
1921 /* aNULL, aSRP or kPSK do not need public keys */
1922 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) {
1923 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1924 goto err;
1925 }
1926 /* still data left over */
1927 if (n != 0) {
1928 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
1929 goto f_err;
1930 }
1931 }
1932 EVP_PKEY_free(pkey);
1933 EVP_MD_CTX_cleanup(&md_ctx);
1934 return (1);
1935 f_err:
1936 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1937 err:
1938 EVP_PKEY_free(pkey);
1939 #ifndef OPENSSL_NO_RSA
1940 if (rsa != NULL)
1941 RSA_free(rsa);
1942 #endif
1943 #ifndef OPENSSL_NO_DH
1944 if (dh != NULL)
1945 DH_free(dh);
1946 #endif
1947 #ifndef OPENSSL_NO_ECDH
1948 BN_CTX_free(bn_ctx);
1949 EC_POINT_free(srvr_ecpoint);
1950 if (ecdh != NULL)
1951 EC_KEY_free(ecdh);
1952 #endif
1953 EVP_MD_CTX_cleanup(&md_ctx);
1954 s->state = SSL_ST_ERR;
1955 return (-1);
1956 }
1957
ssl3_get_certificate_request(SSL * s)1958 int ssl3_get_certificate_request(SSL *s)
1959 {
1960 int ok, ret = 0;
1961 unsigned long n, nc, l;
1962 unsigned int llen, ctype_num, i;
1963 X509_NAME *xn = NULL;
1964 const unsigned char *p, *q;
1965 unsigned char *d;
1966 STACK_OF(X509_NAME) *ca_sk = NULL;
1967
1968 n = s->method->ssl_get_message(s,
1969 SSL3_ST_CR_CERT_REQ_A,
1970 SSL3_ST_CR_CERT_REQ_B,
1971 -1, s->max_cert_list, &ok);
1972
1973 if (!ok)
1974 return ((int)n);
1975
1976 s->s3->tmp.cert_req = 0;
1977
1978 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
1979 s->s3->tmp.reuse_message = 1;
1980 /*
1981 * If we get here we don't need any cached handshake records as we
1982 * wont be doing client auth.
1983 */
1984 if (s->s3->handshake_buffer) {
1985 if (!ssl3_digest_cached_records(s))
1986 goto err;
1987 }
1988 return (1);
1989 }
1990
1991 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
1992 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1993 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
1994 goto err;
1995 }
1996
1997 /* TLS does not like anon-DH with client cert */
1998 if (s->version > SSL3_VERSION) {
1999 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
2000 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2001 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2002 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2003 goto err;
2004 }
2005 }
2006
2007 p = d = (unsigned char *)s->init_msg;
2008
2009 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
2010 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2011 goto err;
2012 }
2013
2014 /* get the certificate types */
2015 ctype_num = *(p++);
2016 if (ctype_num > SSL3_CT_NUMBER)
2017 ctype_num = SSL3_CT_NUMBER;
2018 for (i = 0; i < ctype_num; i++)
2019 s->s3->tmp.ctype[i] = p[i];
2020 p += ctype_num;
2021 if (TLS1_get_version(s) >= TLS1_2_VERSION) {
2022 n2s(p, llen);
2023 /*
2024 * Check we have enough room for signature algorithms and following
2025 * length value.
2026 */
2027 if ((unsigned long)(p - d + llen + 2) > n) {
2028 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2029 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2030 SSL_R_DATA_LENGTH_TOO_LONG);
2031 goto err;
2032 }
2033 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen)) {
2034 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2035 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2036 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2037 goto err;
2038 }
2039 p += llen;
2040 }
2041
2042 /* get the CA RDNs */
2043 n2s(p, llen);
2044 #if 0
2045 {
2046 FILE *out;
2047 out = fopen("/tmp/vsign.der", "w");
2048 fwrite(p, 1, llen, out);
2049 fclose(out);
2050 }
2051 #endif
2052
2053 if ((unsigned long)(p - d + llen) != n) {
2054 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2055 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
2056 goto err;
2057 }
2058
2059 for (nc = 0; nc < llen;) {
2060 n2s(p, l);
2061 if ((l + nc + 2) > llen) {
2062 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2063 goto cont; /* netscape bugs */
2064 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2065 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
2066 goto err;
2067 }
2068
2069 q = p;
2070
2071 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
2072 /* If netscape tolerance is on, ignore errors */
2073 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2074 goto cont;
2075 else {
2076 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2077 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
2078 goto err;
2079 }
2080 }
2081
2082 if (q != (p + l)) {
2083 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2084 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2085 SSL_R_CA_DN_LENGTH_MISMATCH);
2086 goto err;
2087 }
2088 if (!sk_X509_NAME_push(ca_sk, xn)) {
2089 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2090 goto err;
2091 }
2092
2093 p += l;
2094 nc += l + 2;
2095 }
2096
2097 if (0) {
2098 cont:
2099 ERR_clear_error();
2100 }
2101
2102 /* we should setup a certificate to return.... */
2103 s->s3->tmp.cert_req = 1;
2104 s->s3->tmp.ctype_num = ctype_num;
2105 if (s->s3->tmp.ca_names != NULL)
2106 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
2107 s->s3->tmp.ca_names = ca_sk;
2108 ca_sk = NULL;
2109
2110 ret = 1;
2111 goto done;
2112 err:
2113 s->state = SSL_ST_ERR;
2114 done:
2115 if (ca_sk != NULL)
2116 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
2117 return (ret);
2118 }
2119
ca_dn_cmp(const X509_NAME * const * a,const X509_NAME * const * b)2120 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
2121 {
2122 return (X509_NAME_cmp(*a, *b));
2123 }
2124
2125 #ifndef OPENSSL_NO_TLSEXT
ssl3_get_new_session_ticket(SSL * s)2126 int ssl3_get_new_session_ticket(SSL *s)
2127 {
2128 int ok, al, ret = 0, ticklen;
2129 long n;
2130 const unsigned char *p;
2131 unsigned char *d;
2132
2133 n = s->method->ssl_get_message(s,
2134 SSL3_ST_CR_SESSION_TICKET_A,
2135 SSL3_ST_CR_SESSION_TICKET_B,
2136 SSL3_MT_NEWSESSION_TICKET, 16384, &ok);
2137
2138 if (!ok)
2139 return ((int)n);
2140
2141 if (n < 6) {
2142 /* need at least ticket_lifetime_hint + ticket length */
2143 al = SSL_AD_DECODE_ERROR;
2144 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2145 goto f_err;
2146 }
2147
2148 p = d = (unsigned char *)s->init_msg;
2149
2150 if (s->session->session_id_length > 0) {
2151 int i = s->session_ctx->session_cache_mode;
2152 SSL_SESSION *new_sess;
2153 /*
2154 * We reused an existing session, so we need to replace it with a new
2155 * one
2156 */
2157 if (i & SSL_SESS_CACHE_CLIENT) {
2158 /*
2159 * Remove the old session from the cache
2160 */
2161 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) {
2162 if (s->session_ctx->remove_session_cb != NULL)
2163 s->session_ctx->remove_session_cb(s->session_ctx,
2164 s->session);
2165 } else {
2166 /* We carry on if this fails */
2167 SSL_CTX_remove_session(s->session_ctx, s->session);
2168 }
2169 }
2170
2171 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
2172 al = SSL_AD_INTERNAL_ERROR;
2173 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2174 goto f_err;
2175 }
2176
2177 SSL_SESSION_free(s->session);
2178 s->session = new_sess;
2179 }
2180
2181 n2l(p, s->session->tlsext_tick_lifetime_hint);
2182 n2s(p, ticklen);
2183 /* ticket_lifetime_hint + ticket_length + ticket */
2184 if (ticklen + 6 != n) {
2185 al = SSL_AD_DECODE_ERROR;
2186 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2187 goto f_err;
2188 }
2189 if (s->session->tlsext_tick) {
2190 OPENSSL_free(s->session->tlsext_tick);
2191 s->session->tlsext_ticklen = 0;
2192 }
2193 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2194 if (!s->session->tlsext_tick) {
2195 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2196 goto err;
2197 }
2198 memcpy(s->session->tlsext_tick, p, ticklen);
2199 s->session->tlsext_ticklen = ticklen;
2200 /*
2201 * There are two ways to detect a resumed ticket session. One is to set
2202 * an appropriate session ID and then the server must return a match in
2203 * ServerHello. This allows the normal client session ID matching to work
2204 * and we know much earlier that the ticket has been accepted. The
2205 * other way is to set zero length session ID when the ticket is
2206 * presented and rely on the handshake to determine session resumption.
2207 * We choose the former approach because this fits in with assumptions
2208 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
2209 * SHA256 is disabled) hash of the ticket.
2210 */
2211 EVP_Digest(p, ticklen,
2212 s->session->session_id, &s->session->session_id_length,
2213 # ifndef OPENSSL_NO_SHA256
2214 EVP_sha256(), NULL);
2215 # else
2216 EVP_sha1(), NULL);
2217 # endif
2218 ret = 1;
2219 return (ret);
2220 f_err:
2221 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2222 err:
2223 s->state = SSL_ST_ERR;
2224 return (-1);
2225 }
2226
ssl3_get_cert_status(SSL * s)2227 int ssl3_get_cert_status(SSL *s)
2228 {
2229 int ok, al;
2230 unsigned long resplen, n;
2231 const unsigned char *p;
2232
2233 n = s->method->ssl_get_message(s,
2234 SSL3_ST_CR_CERT_STATUS_A,
2235 SSL3_ST_CR_CERT_STATUS_B,
2236 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
2237
2238 if (!ok)
2239 return ((int)n);
2240 if (n < 4) {
2241 /* need at least status type + length */
2242 al = SSL_AD_DECODE_ERROR;
2243 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2244 goto f_err;
2245 }
2246 p = (unsigned char *)s->init_msg;
2247 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
2248 al = SSL_AD_DECODE_ERROR;
2249 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
2250 goto f_err;
2251 }
2252 n2l3(p, resplen);
2253 if (resplen + 4 != n) {
2254 al = SSL_AD_DECODE_ERROR;
2255 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2256 goto f_err;
2257 }
2258 if (s->tlsext_ocsp_resp)
2259 OPENSSL_free(s->tlsext_ocsp_resp);
2260 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2261 if (!s->tlsext_ocsp_resp) {
2262 al = SSL_AD_INTERNAL_ERROR;
2263 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2264 goto f_err;
2265 }
2266 s->tlsext_ocsp_resplen = resplen;
2267 if (s->ctx->tlsext_status_cb) {
2268 int ret;
2269 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2270 if (ret == 0) {
2271 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2272 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
2273 goto f_err;
2274 }
2275 if (ret < 0) {
2276 al = SSL_AD_INTERNAL_ERROR;
2277 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2278 goto f_err;
2279 }
2280 }
2281 return 1;
2282 f_err:
2283 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2284 s->state = SSL_ST_ERR;
2285 return (-1);
2286 }
2287 #endif
2288
ssl3_get_server_done(SSL * s)2289 int ssl3_get_server_done(SSL *s)
2290 {
2291 int ok, ret = 0;
2292 long n;
2293
2294 /* Second to last param should be very small, like 0 :-) */
2295 n = s->method->ssl_get_message(s,
2296 SSL3_ST_CR_SRVR_DONE_A,
2297 SSL3_ST_CR_SRVR_DONE_B,
2298 SSL3_MT_SERVER_DONE, 30, &ok);
2299
2300 if (!ok)
2301 return ((int)n);
2302 if (n > 0) {
2303 /* should contain no data */
2304 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2305 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
2306 s->state = SSL_ST_ERR;
2307 return -1;
2308 }
2309 ret = 1;
2310 return (ret);
2311 }
2312
ssl3_send_client_key_exchange(SSL * s)2313 int ssl3_send_client_key_exchange(SSL *s)
2314 {
2315 unsigned char *p, *d;
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_ECDH
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
2334 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
2335 d = (unsigned char *)s->init_buf->data;
2336 p = &(d[4]);
2337
2338 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2339
2340 /* Fool emacs indentation */
2341 if (0) {
2342 }
2343 #ifndef OPENSSL_NO_RSA
2344 else if (alg_k & SSL_kRSA) {
2345 RSA *rsa;
2346 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2347
2348 if (s->session->sess_cert == NULL) {
2349 /*
2350 * We should always have a server certificate with SSL_kRSA.
2351 */
2352 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2353 ERR_R_INTERNAL_ERROR);
2354 goto err;
2355 }
2356
2357 if (s->session->sess_cert->peer_rsa_tmp != NULL)
2358 rsa = s->session->sess_cert->peer_rsa_tmp;
2359 else {
2360 pkey =
2361 X509_get_pubkey(s->session->
2362 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
2363 x509);
2364 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
2365 || (pkey->pkey.rsa == NULL)) {
2366 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2367 ERR_R_INTERNAL_ERROR);
2368 goto err;
2369 }
2370 rsa = pkey->pkey.rsa;
2371 EVP_PKEY_free(pkey);
2372 }
2373
2374 tmp_buf[0] = s->client_version >> 8;
2375 tmp_buf[1] = s->client_version & 0xff;
2376 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2377 goto err;
2378
2379 s->session->master_key_length = sizeof tmp_buf;
2380
2381 q = p;
2382 /* Fix buf for TLS and beyond */
2383 if (s->version > SSL3_VERSION)
2384 p += 2;
2385 n = RSA_public_encrypt(sizeof tmp_buf,
2386 tmp_buf, p, rsa, RSA_PKCS1_PADDING);
2387 # ifdef PKCS1_CHECK
2388 if (s->options & SSL_OP_PKCS1_CHECK_1)
2389 p[1]++;
2390 if (s->options & SSL_OP_PKCS1_CHECK_2)
2391 tmp_buf[0] = 0x70;
2392 # endif
2393 if (n <= 0) {
2394 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2395 SSL_R_BAD_RSA_ENCRYPT);
2396 goto err;
2397 }
2398
2399 /* Fix buf for TLS and beyond */
2400 if (s->version > SSL3_VERSION) {
2401 s2n(n, q);
2402 n += 2;
2403 }
2404
2405 s->session->master_key_length =
2406 s->method->ssl3_enc->generate_master_secret(s,
2407 s->
2408 session->master_key,
2409 tmp_buf,
2410 sizeof tmp_buf);
2411 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2412 }
2413 #endif
2414 #ifndef OPENSSL_NO_KRB5
2415 else if (alg_k & SSL_kKRB5) {
2416 krb5_error_code krb5rc;
2417 KSSL_CTX *kssl_ctx = s->kssl_ctx;
2418 /* krb5_data krb5_ap_req; */
2419 krb5_data *enc_ticket;
2420 krb5_data authenticator, *authp = NULL;
2421 EVP_CIPHER_CTX ciph_ctx;
2422 const EVP_CIPHER *enc = NULL;
2423 unsigned char iv[EVP_MAX_IV_LENGTH];
2424 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2425 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
2426 int padl, outl = sizeof(epms);
2427
2428 EVP_CIPHER_CTX_init(&ciph_ctx);
2429
2430 # ifdef KSSL_DEBUG
2431 fprintf(stderr, "ssl3_send_client_key_exchange(%lx & %lx)\n",
2432 alg_k, SSL_kKRB5);
2433 # endif /* KSSL_DEBUG */
2434
2435 authp = NULL;
2436 # ifdef KRB5SENDAUTH
2437 if (KRB5SENDAUTH)
2438 authp = &authenticator;
2439 # endif /* KRB5SENDAUTH */
2440
2441 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
2442 enc = kssl_map_enc(kssl_ctx->enctype);
2443 if (enc == NULL)
2444 goto err;
2445 # ifdef KSSL_DEBUG
2446 {
2447 fprintf(stderr, "kssl_cget_tkt rtn %d\n", krb5rc);
2448 if (krb5rc && kssl_err.text)
2449 fprintf(stderr, "kssl_cget_tkt kssl_err=%s\n",
2450 kssl_err.text);
2451 }
2452 # endif /* KSSL_DEBUG */
2453
2454 if (krb5rc) {
2455 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2456 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
2457 goto err;
2458 }
2459
2460 /*-
2461 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
2462 * in place of RFC 2712 KerberosWrapper, as in:
2463 *
2464 * Send ticket (copy to *p, set n = length)
2465 * n = krb5_ap_req.length;
2466 * memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2467 * if (krb5_ap_req.data)
2468 * kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2469 *
2470 * Now using real RFC 2712 KerberosWrapper
2471 * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2472 * Note: 2712 "opaque" types are here replaced
2473 * with a 2-byte length followed by the value.
2474 * Example:
2475 * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2476 * Where "xx xx" = length bytes. Shown here with
2477 * optional authenticator omitted.
2478 */
2479
2480 /* KerberosWrapper.Ticket */
2481 s2n(enc_ticket->length, p);
2482 memcpy(p, enc_ticket->data, enc_ticket->length);
2483 p += enc_ticket->length;
2484 n = enc_ticket->length + 2;
2485
2486 /* KerberosWrapper.Authenticator */
2487 if (authp && authp->length) {
2488 s2n(authp->length, p);
2489 memcpy(p, authp->data, authp->length);
2490 p += authp->length;
2491 n += authp->length + 2;
2492
2493 free(authp->data);
2494 authp->data = NULL;
2495 authp->length = 0;
2496 } else {
2497 s2n(0, p); /* null authenticator length */
2498 n += 2;
2499 }
2500
2501 tmp_buf[0] = s->client_version >> 8;
2502 tmp_buf[1] = s->client_version & 0xff;
2503 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2504 goto err;
2505
2506 /*-
2507 * 20010420 VRS. Tried it this way; failed.
2508 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2509 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2510 * kssl_ctx->length);
2511 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2512 */
2513
2514 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2515 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
2516 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
2517 sizeof tmp_buf);
2518 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
2519 outl += padl;
2520 if (outl > (int)sizeof epms) {
2521 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2522 ERR_R_INTERNAL_ERROR);
2523 goto err;
2524 }
2525 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2526
2527 /* KerberosWrapper.EncryptedPreMasterSecret */
2528 s2n(outl, p);
2529 memcpy(p, epms, outl);
2530 p += outl;
2531 n += outl + 2;
2532
2533 s->session->master_key_length =
2534 s->method->ssl3_enc->generate_master_secret(s,
2535 s->
2536 session->master_key,
2537 tmp_buf,
2538 sizeof tmp_buf);
2539
2540 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2541 OPENSSL_cleanse(epms, outl);
2542 }
2543 #endif
2544 #ifndef OPENSSL_NO_DH
2545 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
2546 DH *dh_srvr, *dh_clnt;
2547
2548 if (s->session->sess_cert == NULL) {
2549 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2550 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2551 SSL_R_UNEXPECTED_MESSAGE);
2552 goto err;
2553 }
2554
2555 if (s->session->sess_cert->peer_dh_tmp != NULL)
2556 dh_srvr = s->session->sess_cert->peer_dh_tmp;
2557 else {
2558 /* we get them from the cert */
2559 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2560 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2561 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2562 goto err;
2563 }
2564
2565 /* generate a new random key */
2566 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2567 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2568 goto err;
2569 }
2570 if (!DH_generate_key(dh_clnt)) {
2571 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2572 DH_free(dh_clnt);
2573 goto err;
2574 }
2575
2576 /*
2577 * use the 'p' output buffer for the DH key, but make sure to
2578 * clear it out afterwards
2579 */
2580
2581 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
2582
2583 if (n <= 0) {
2584 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2585 DH_free(dh_clnt);
2586 goto err;
2587 }
2588
2589 /* generate master key from the result */
2590 s->session->master_key_length =
2591 s->method->ssl3_enc->generate_master_secret(s,
2592 s->
2593 session->master_key,
2594 p, n);
2595 /* clean up */
2596 memset(p, 0, n);
2597
2598 /* send off the data */
2599 n = BN_num_bytes(dh_clnt->pub_key);
2600 s2n(n, p);
2601 BN_bn2bin(dh_clnt->pub_key, p);
2602 n += 2;
2603
2604 DH_free(dh_clnt);
2605 }
2606 #endif
2607
2608 #ifndef OPENSSL_NO_ECDH
2609 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) {
2610 const EC_GROUP *srvr_group = NULL;
2611 EC_KEY *tkey;
2612 int ecdh_clnt_cert = 0;
2613 int field_size = 0;
2614
2615 if (s->session->sess_cert == NULL) {
2616 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2617 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2618 SSL_R_UNEXPECTED_MESSAGE);
2619 goto err;
2620 }
2621
2622 /*
2623 * Did we send out the client's ECDH share for use in premaster
2624 * computation as part of client certificate? If so, set
2625 * ecdh_clnt_cert to 1.
2626 */
2627 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
2628 /*-
2629 * XXX: For now, we do not support client
2630 * authentication using ECDH certificates.
2631 * To add such support, one needs to add
2632 * code that checks for appropriate
2633 * conditions and sets ecdh_clnt_cert to 1.
2634 * For example, the cert have an ECC
2635 * key on the same curve as the server's
2636 * and the key should be authorized for
2637 * key agreement.
2638 *
2639 * One also needs to add code in ssl3_connect
2640 * to skip sending the certificate verify
2641 * message.
2642 *
2643 * if ((s->cert->key->privatekey != NULL) &&
2644 * (s->cert->key->privatekey->type ==
2645 * EVP_PKEY_EC) && ...)
2646 * ecdh_clnt_cert = 1;
2647 */
2648 }
2649
2650 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2651 tkey = s->session->sess_cert->peer_ecdh_tmp;
2652 } else {
2653 /* Get the Server Public Key from Cert */
2654 srvr_pub_pkey =
2655 X509_get_pubkey(s->session->
2656 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2657 if ((srvr_pub_pkey == NULL)
2658 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2659 || (srvr_pub_pkey->pkey.ec == NULL)) {
2660 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2661 ERR_R_INTERNAL_ERROR);
2662 goto err;
2663 }
2664
2665 tkey = srvr_pub_pkey->pkey.ec;
2666 }
2667
2668 srvr_group = EC_KEY_get0_group(tkey);
2669 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2670
2671 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2672 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2673 ERR_R_INTERNAL_ERROR);
2674 goto err;
2675 }
2676
2677 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2678 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2679 ERR_R_MALLOC_FAILURE);
2680 goto err;
2681 }
2682
2683 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2684 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2685 goto err;
2686 }
2687 if (ecdh_clnt_cert) {
2688 /*
2689 * Reuse key info from our certificate We only need our
2690 * private key to perform the ECDH computation.
2691 */
2692 const BIGNUM *priv_key;
2693 tkey = s->cert->key->privatekey->pkey.ec;
2694 priv_key = EC_KEY_get0_private_key(tkey);
2695 if (priv_key == NULL) {
2696 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2697 ERR_R_MALLOC_FAILURE);
2698 goto err;
2699 }
2700 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2701 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2702 goto err;
2703 }
2704 } else {
2705 /* Generate a new ECDH key pair */
2706 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2707 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2708 ERR_R_ECDH_LIB);
2709 goto err;
2710 }
2711 }
2712
2713 /*
2714 * use the 'p' output buffer for the ECDH key, but make sure to
2715 * clear it out afterwards
2716 */
2717
2718 field_size = EC_GROUP_get_degree(srvr_group);
2719 if (field_size <= 0) {
2720 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2721 goto err;
2722 }
2723 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint,
2724 clnt_ecdh, NULL);
2725 if (n <= 0) {
2726 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2727 goto err;
2728 }
2729
2730 /* generate master key from the result */
2731 s->session->master_key_length =
2732 s->method->ssl3_enc->generate_master_secret(s,
2733 s->
2734 session->master_key,
2735 p, n);
2736
2737 memset(p, 0, n); /* clean up */
2738
2739 if (ecdh_clnt_cert) {
2740 /* Send empty client key exch message */
2741 n = 0;
2742 } else {
2743 /*
2744 * First check the size of encoding and allocate memory
2745 * accordingly.
2746 */
2747 encoded_pt_len =
2748 EC_POINT_point2oct(srvr_group,
2749 EC_KEY_get0_public_key(clnt_ecdh),
2750 POINT_CONVERSION_UNCOMPRESSED,
2751 NULL, 0, NULL);
2752
2753 encodedPoint = (unsigned char *)
2754 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2755 bn_ctx = BN_CTX_new();
2756 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2757 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2758 ERR_R_MALLOC_FAILURE);
2759 goto err;
2760 }
2761
2762 /* Encode the public key */
2763 n = EC_POINT_point2oct(srvr_group,
2764 EC_KEY_get0_public_key(clnt_ecdh),
2765 POINT_CONVERSION_UNCOMPRESSED,
2766 encodedPoint, encoded_pt_len, bn_ctx);
2767
2768 *p = n; /* length of encoded point */
2769 /* Encoded point will be copied here */
2770 p += 1;
2771 /* copy the point */
2772 memcpy((unsigned char *)p, encodedPoint, n);
2773 /* increment n to account for length field */
2774 n += 1;
2775 }
2776
2777 /* Free allocated memory */
2778 BN_CTX_free(bn_ctx);
2779 if (encodedPoint != NULL)
2780 OPENSSL_free(encodedPoint);
2781 if (clnt_ecdh != NULL)
2782 EC_KEY_free(clnt_ecdh);
2783 EVP_PKEY_free(srvr_pub_pkey);
2784 }
2785 #endif /* !OPENSSL_NO_ECDH */
2786 else if (alg_k & SSL_kGOST) {
2787 /* GOST key exchange message creation */
2788 EVP_PKEY_CTX *pkey_ctx;
2789 X509 *peer_cert;
2790 size_t msglen;
2791 unsigned int md_len;
2792 int keytype;
2793 unsigned char premaster_secret[32], shared_ukm[32], tmp[256];
2794 EVP_MD_CTX *ukm_hash;
2795 EVP_PKEY *pub_key;
2796
2797 /*
2798 * Get server sertificate PKEY and create ctx from it
2799 */
2800 peer_cert =
2801 s->session->
2802 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509;
2803 if (!peer_cert)
2804 peer_cert =
2805 s->session->
2806 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509;
2807 if (!peer_cert) {
2808 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2809 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2810 goto err;
2811 }
2812
2813 pkey_ctx = EVP_PKEY_CTX_new(pub_key =
2814 X509_get_pubkey(peer_cert), NULL);
2815 /*
2816 * If we have send a certificate, and certificate key
2817 *
2818 * * parameters match those of server certificate, use
2819 * certificate key for key exchange
2820 */
2821
2822 /* Otherwise, generate ephemeral key pair */
2823
2824 EVP_PKEY_encrypt_init(pkey_ctx);
2825 /* Generate session key */
2826 if (RAND_bytes(premaster_secret, 32) <= 0) {
2827 EVP_PKEY_CTX_free(pkey_ctx);
2828 goto err;
2829 }
2830 /*
2831 * If we have client certificate, use its secret as peer key
2832 */
2833 if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2834 if (EVP_PKEY_derive_set_peer
2835 (pkey_ctx, s->cert->key->privatekey) <= 0) {
2836 /*
2837 * If there was an error - just ignore it. Ephemeral key
2838 * * would be used
2839 */
2840 ERR_clear_error();
2841 }
2842 }
2843 /*
2844 * Compute shared IV and store it in algorithm-specific context
2845 * data
2846 */
2847 ukm_hash = EVP_MD_CTX_create();
2848 EVP_DigestInit(ukm_hash,
2849 EVP_get_digestbynid(NID_id_GostR3411_94));
2850 EVP_DigestUpdate(ukm_hash, s->s3->client_random,
2851 SSL3_RANDOM_SIZE);
2852 EVP_DigestUpdate(ukm_hash, s->s3->server_random,
2853 SSL3_RANDOM_SIZE);
2854 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2855 EVP_MD_CTX_destroy(ukm_hash);
2856 if (EVP_PKEY_CTX_ctrl
2857 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8,
2858 shared_ukm) < 0) {
2859 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2860 SSL_R_LIBRARY_BUG);
2861 goto err;
2862 }
2863 /* Make GOST keytransport blob message */
2864 /*
2865 * Encapsulate it into sequence
2866 */
2867 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2868 msglen = 255;
2869 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 32)
2870 < 0) {
2871 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2872 SSL_R_LIBRARY_BUG);
2873 goto err;
2874 }
2875 if (msglen >= 0x80) {
2876 *(p++) = 0x81;
2877 *(p++) = msglen & 0xff;
2878 n = msglen + 3;
2879 } else {
2880 *(p++) = msglen & 0xff;
2881 n = msglen + 2;
2882 }
2883 memcpy(p, tmp, msglen);
2884 /* Check if pubkey from client certificate was used */
2885 if (EVP_PKEY_CTX_ctrl
2886 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) {
2887 /* Set flag "skip certificate verify" */
2888 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2889 }
2890 EVP_PKEY_CTX_free(pkey_ctx);
2891 s->session->master_key_length =
2892 s->method->ssl3_enc->generate_master_secret(s,
2893 s->
2894 session->master_key,
2895 premaster_secret,
2896 32);
2897 EVP_PKEY_free(pub_key);
2898
2899 }
2900 #ifndef OPENSSL_NO_SRP
2901 else if (alg_k & SSL_kSRP) {
2902 if (s->srp_ctx.A != NULL) {
2903 /* send off the data */
2904 n = BN_num_bytes(s->srp_ctx.A);
2905 s2n(n, p);
2906 BN_bn2bin(s->srp_ctx.A, p);
2907 n += 2;
2908 } else {
2909 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2910 ERR_R_INTERNAL_ERROR);
2911 goto err;
2912 }
2913 if (s->session->srp_username != NULL)
2914 OPENSSL_free(s->session->srp_username);
2915 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2916 if (s->session->srp_username == NULL) {
2917 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2918 ERR_R_MALLOC_FAILURE);
2919 goto err;
2920 }
2921
2922 if ((s->session->master_key_length =
2923 SRP_generate_client_master_secret(s,
2924 s->session->master_key)) <
2925 0) {
2926 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2927 ERR_R_INTERNAL_ERROR);
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 char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4];
2943 unsigned int pre_ms_len = 0, psk_len = 0;
2944 int psk_err = 1;
2945
2946 n = 0;
2947 if (s->psk_client_callback == NULL) {
2948 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2949 SSL_R_PSK_NO_CLIENT_CB);
2950 goto err;
2951 }
2952
2953 memset(identity, 0, sizeof(identity));
2954 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2955 identity, sizeof(identity) - 1,
2956 psk_or_pre_ms,
2957 sizeof(psk_or_pre_ms));
2958 if (psk_len > PSK_MAX_PSK_LEN) {
2959 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2960 ERR_R_INTERNAL_ERROR);
2961 goto psk_err;
2962 } else if (psk_len == 0) {
2963 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2964 SSL_R_PSK_IDENTITY_NOT_FOUND);
2965 goto psk_err;
2966 }
2967 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
2968 identity_len = strlen(identity);
2969 if (identity_len > PSK_MAX_IDENTITY_LEN) {
2970 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2971 ERR_R_INTERNAL_ERROR);
2972 goto psk_err;
2973 }
2974 /* create PSK pre_master_secret */
2975 pre_ms_len = 2 + psk_len + 2 + psk_len;
2976 t = psk_or_pre_ms;
2977 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len);
2978 s2n(psk_len, t);
2979 memset(t, 0, psk_len);
2980 t += psk_len;
2981 s2n(psk_len, t);
2982
2983 if (s->session->psk_identity_hint != NULL)
2984 OPENSSL_free(s->session->psk_identity_hint);
2985 s->session->psk_identity_hint =
2986 BUF_strdup(s->ctx->psk_identity_hint);
2987 if (s->ctx->psk_identity_hint != NULL
2988 && s->session->psk_identity_hint == NULL) {
2989 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2990 ERR_R_MALLOC_FAILURE);
2991 goto psk_err;
2992 }
2993
2994 if (s->session->psk_identity != NULL)
2995 OPENSSL_free(s->session->psk_identity);
2996 s->session->psk_identity = BUF_strdup(identity);
2997 if (s->session->psk_identity == NULL) {
2998 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2999 ERR_R_MALLOC_FAILURE);
3000 goto psk_err;
3001 }
3002
3003 s->session->master_key_length =
3004 s->method->ssl3_enc->generate_master_secret(s,
3005 s->
3006 session->master_key,
3007 psk_or_pre_ms,
3008 pre_ms_len);
3009 s2n(identity_len, p);
3010 memcpy(p, identity, identity_len);
3011 n = 2 + identity_len;
3012 psk_err = 0;
3013 psk_err:
3014 OPENSSL_cleanse(identity, sizeof(identity));
3015 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3016 if (psk_err != 0) {
3017 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3018 goto err;
3019 }
3020 }
3021 #endif
3022 else {
3023 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3024 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3025 goto err;
3026 }
3027
3028 *(d++) = SSL3_MT_CLIENT_KEY_EXCHANGE;
3029 l2n3(n, d);
3030
3031 s->state = SSL3_ST_CW_KEY_EXCH_B;
3032 /* number of bytes to write */
3033 s->init_num = n + 4;
3034 s->init_off = 0;
3035 }
3036
3037 /* SSL3_ST_CW_KEY_EXCH_B */
3038 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
3039 err:
3040 #ifndef OPENSSL_NO_ECDH
3041 BN_CTX_free(bn_ctx);
3042 if (encodedPoint != NULL)
3043 OPENSSL_free(encodedPoint);
3044 if (clnt_ecdh != NULL)
3045 EC_KEY_free(clnt_ecdh);
3046 EVP_PKEY_free(srvr_pub_pkey);
3047 #endif
3048 s->state = SSL_ST_ERR;
3049 return (-1);
3050 }
3051
ssl3_send_client_verify(SSL * s)3052 int ssl3_send_client_verify(SSL *s)
3053 {
3054 unsigned char *p, *d;
3055 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
3056 EVP_PKEY *pkey;
3057 EVP_PKEY_CTX *pctx = NULL;
3058 EVP_MD_CTX mctx;
3059 unsigned u = 0;
3060 unsigned long n;
3061 int j;
3062
3063 EVP_MD_CTX_init(&mctx);
3064
3065 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
3066 d = (unsigned char *)s->init_buf->data;
3067 p = &(d[4]);
3068 pkey = s->cert->key->privatekey;
3069 /* Create context from key and test if sha1 is allowed as digest */
3070 pctx = EVP_PKEY_CTX_new(pkey, NULL);
3071 EVP_PKEY_sign_init(pctx);
3072 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
3073 if (TLS1_get_version(s) < TLS1_2_VERSION)
3074 s->method->ssl3_enc->cert_verify_mac(s,
3075 NID_sha1,
3076 &(data
3077 [MD5_DIGEST_LENGTH]));
3078 } else {
3079 ERR_clear_error();
3080 }
3081 /*
3082 * For TLS v1.2 send signature algorithm and signature using agreed
3083 * digest and cached handshake records.
3084 */
3085 if (TLS1_get_version(s) >= TLS1_2_VERSION) {
3086 long hdatalen = 0;
3087 void *hdata;
3088 const EVP_MD *md = s->cert->key->digest;
3089 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3090 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) {
3091 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3092 goto err;
3093 }
3094 p += 2;
3095 #ifdef SSL_DEBUG
3096 fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3097 EVP_MD_name(md));
3098 #endif
3099 if (!EVP_SignInit_ex(&mctx, md, NULL)
3100 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3101 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
3102 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB);
3103 goto err;
3104 }
3105 s2n(u, p);
3106 n = u + 4;
3107 if (!ssl3_digest_cached_records(s))
3108 goto err;
3109 } else
3110 #ifndef OPENSSL_NO_RSA
3111 if (pkey->type == EVP_PKEY_RSA) {
3112 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
3113 if (RSA_sign(NID_md5_sha1, data,
3114 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
3115 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
3116 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
3117 goto err;
3118 }
3119 s2n(u, p);
3120 n = u + 2;
3121 } else
3122 #endif
3123 #ifndef OPENSSL_NO_DSA
3124 if (pkey->type == EVP_PKEY_DSA) {
3125 if (!DSA_sign(pkey->save_type,
3126 &(data[MD5_DIGEST_LENGTH]),
3127 SHA_DIGEST_LENGTH, &(p[2]),
3128 (unsigned int *)&j, pkey->pkey.dsa)) {
3129 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
3130 goto err;
3131 }
3132 s2n(j, p);
3133 n = j + 2;
3134 } else
3135 #endif
3136 #ifndef OPENSSL_NO_ECDSA
3137 if (pkey->type == EVP_PKEY_EC) {
3138 if (!ECDSA_sign(pkey->save_type,
3139 &(data[MD5_DIGEST_LENGTH]),
3140 SHA_DIGEST_LENGTH, &(p[2]),
3141 (unsigned int *)&j, pkey->pkey.ec)) {
3142 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
3143 goto err;
3144 }
3145 s2n(j, p);
3146 n = j + 2;
3147 } else
3148 #endif
3149 if (pkey->type == NID_id_GostR3410_94
3150 || pkey->type == NID_id_GostR3410_2001) {
3151 unsigned char signbuf[64];
3152 int i;
3153 size_t sigsize = 64;
3154 s->method->ssl3_enc->cert_verify_mac(s,
3155 NID_id_GostR3411_94, data);
3156 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3157 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3158 goto err;
3159 }
3160 for (i = 63, j = 0; i >= 0; j++, i--) {
3161 p[2 + j] = signbuf[i];
3162 }
3163 s2n(j, p);
3164 n = j + 2;
3165 } else {
3166 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3167 goto err;
3168 }
3169 *(d++) = SSL3_MT_CERTIFICATE_VERIFY;
3170 l2n3(n, d);
3171
3172 s->state = SSL3_ST_CW_CERT_VRFY_B;
3173 s->init_num = (int)n + 4;
3174 s->init_off = 0;
3175 }
3176 EVP_MD_CTX_cleanup(&mctx);
3177 EVP_PKEY_CTX_free(pctx);
3178 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
3179 err:
3180 EVP_MD_CTX_cleanup(&mctx);
3181 EVP_PKEY_CTX_free(pctx);
3182 s->state = SSL_ST_ERR;
3183 return (-1);
3184 }
3185
ssl3_send_client_certificate(SSL * s)3186 int ssl3_send_client_certificate(SSL *s)
3187 {
3188 X509 *x509 = NULL;
3189 EVP_PKEY *pkey = NULL;
3190 int i;
3191 unsigned long l;
3192
3193 if (s->state == SSL3_ST_CW_CERT_A) {
3194 if ((s->cert == NULL) ||
3195 (s->cert->key->x509 == NULL) ||
3196 (s->cert->key->privatekey == NULL))
3197 s->state = SSL3_ST_CW_CERT_B;
3198 else
3199 s->state = SSL3_ST_CW_CERT_C;
3200 }
3201
3202 /* We need to get a client cert */
3203 if (s->state == SSL3_ST_CW_CERT_B) {
3204 /*
3205 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3206 * return(-1); We then get retied later
3207 */
3208 i = 0;
3209 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3210 if (i < 0) {
3211 s->rwstate = SSL_X509_LOOKUP;
3212 return (-1);
3213 }
3214 s->rwstate = SSL_NOTHING;
3215 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3216 s->state = SSL3_ST_CW_CERT_B;
3217 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3218 i = 0;
3219 } else if (i == 1) {
3220 i = 0;
3221 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
3222 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3223 }
3224
3225 if (x509 != NULL)
3226 X509_free(x509);
3227 if (pkey != NULL)
3228 EVP_PKEY_free(pkey);
3229 if (i == 0) {
3230 if (s->version == SSL3_VERSION) {
3231 s->s3->tmp.cert_req = 0;
3232 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3233 return (1);
3234 } else {
3235 s->s3->tmp.cert_req = 2;
3236 }
3237 }
3238
3239 /* Ok, we have a cert */
3240 s->state = SSL3_ST_CW_CERT_C;
3241 }
3242
3243 if (s->state == SSL3_ST_CW_CERT_C) {
3244 s->state = SSL3_ST_CW_CERT_D;
3245 l = ssl3_output_cert_chain(s,
3246 (s->s3->tmp.cert_req ==
3247 2) ? NULL : s->cert->key->x509);
3248 if (!l) {
3249 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3250 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3251 s->state = SSL_ST_ERR;
3252 return 0;
3253 }
3254 s->init_num = (int)l;
3255 s->init_off = 0;
3256 }
3257 /* SSL3_ST_CW_CERT_D */
3258 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
3259 }
3260
3261 #define has_bits(i,m) (((i)&(m)) == (m))
3262
ssl3_check_cert_and_algorithm(SSL * s)3263 int ssl3_check_cert_and_algorithm(SSL *s)
3264 {
3265 int i, idx;
3266 long alg_k, alg_a;
3267 EVP_PKEY *pkey = NULL;
3268 int pkey_bits;
3269 SESS_CERT *sc;
3270 #ifndef OPENSSL_NO_RSA
3271 RSA *rsa;
3272 #endif
3273 #ifndef OPENSSL_NO_DH
3274 DH *dh;
3275 #endif
3276 int al = SSL_AD_HANDSHAKE_FAILURE;
3277
3278 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3279 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3280
3281 /* we don't have a certificate */
3282 if ((alg_a & (SSL_aDH | SSL_aNULL | SSL_aKRB5)) || (alg_k & SSL_kPSK))
3283 return (1);
3284
3285 sc = s->session->sess_cert;
3286 if (sc == NULL) {
3287 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3288 goto err;
3289 }
3290 #ifndef OPENSSL_NO_RSA
3291 rsa = s->session->sess_cert->peer_rsa_tmp;
3292 #endif
3293 #ifndef OPENSSL_NO_DH
3294 dh = s->session->sess_cert->peer_dh_tmp;
3295 #endif
3296
3297 /* This is the passed certificate */
3298
3299 idx = sc->peer_cert_type;
3300 #ifndef OPENSSL_NO_ECDH
3301 if (idx == SSL_PKEY_ECC) {
3302 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) {
3303 /* check failed */
3304 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
3305 goto f_err;
3306 } else {
3307 return 1;
3308 }
3309 }
3310 #endif
3311 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
3312 pkey_bits = EVP_PKEY_bits(pkey);
3313 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
3314 EVP_PKEY_free(pkey);
3315
3316 /* Check that we have a certificate if we require one */
3317 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
3318 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3319 SSL_R_MISSING_RSA_SIGNING_CERT);
3320 goto f_err;
3321 }
3322 #ifndef OPENSSL_NO_DSA
3323 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
3324 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3325 SSL_R_MISSING_DSA_SIGNING_CERT);
3326 goto f_err;
3327 }
3328 #endif
3329 #ifndef OPENSSL_NO_RSA
3330 if (alg_k & SSL_kRSA) {
3331 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
3332 !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
3333 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3334 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3335 goto f_err;
3336 } else if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
3337 if (pkey_bits <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3338 if (!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
3339 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3340 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3341 goto f_err;
3342 }
3343 if (rsa != NULL) {
3344 /* server key exchange is not allowed. */
3345 al = SSL_AD_INTERNAL_ERROR;
3346 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3347 goto f_err;
3348 }
3349 }
3350 }
3351 }
3352 #endif
3353 #ifndef OPENSSL_NO_DH
3354 if ((alg_k & SSL_kEDH) && dh == NULL) {
3355 al = SSL_AD_INTERNAL_ERROR;
3356 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3357 goto f_err;
3358 }
3359 if ((alg_k & SSL_kDHr) && !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
3360 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3361 SSL_R_MISSING_DH_RSA_CERT);
3362 goto f_err;
3363 }
3364 # ifndef OPENSSL_NO_DSA
3365 if ((alg_k & SSL_kDHd) && !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
3366 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3367 SSL_R_MISSING_DH_DSA_CERT);
3368 goto f_err;
3369 }
3370 # endif
3371
3372 /* Check DHE only: static DH not implemented. */
3373 if (alg_k & SSL_kEDH) {
3374 int dh_size = BN_num_bits(dh->p);
3375 if ((!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 768)
3376 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 512)) {
3377 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_DH_KEY_TOO_SMALL);
3378 goto f_err;
3379 }
3380 }
3381 #endif /* !OPENSSL_NO_DH */
3382
3383 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
3384 pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3385 #ifndef OPENSSL_NO_RSA
3386 if (alg_k & SSL_kRSA) {
3387 if (rsa == NULL) {
3388 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3389 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3390 goto f_err;
3391 } else if (BN_num_bits(rsa->n) >
3392 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3393 /* We have a temporary RSA key but it's too large. */
3394 al = SSL_AD_EXPORT_RESTRICTION;
3395 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3396 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3397 goto f_err;
3398 }
3399 } else
3400 #endif
3401 #ifndef OPENSSL_NO_DH
3402 if (alg_k & SSL_kEDH) {
3403 if (BN_num_bits(dh->p) >
3404 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3405 /* We have a temporary DH key but it's too large. */
3406 al = SSL_AD_EXPORT_RESTRICTION;
3407 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3408 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3409 goto f_err;
3410 }
3411 } else if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3412 /* The cert should have had an export DH key. */
3413 al = SSL_AD_EXPORT_RESTRICTION;
3414 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3415 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3416 goto f_err;
3417 } else
3418 #endif
3419 {
3420 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3421 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3422 goto f_err;
3423 }
3424 }
3425 return (1);
3426 f_err:
3427 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3428 err:
3429 return (0);
3430 }
3431
3432 #ifndef OPENSSL_NO_TLSEXT
3433 /*
3434 * Normally, we can tell if the server is resuming the session from
3435 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server
3436 * message after the ServerHello to determine if the server is resuming.
3437 * Therefore, we allow EAP-FAST to peek ahead.
3438 * ssl3_check_finished returns 1 if we are resuming from an external
3439 * pre-shared secret, we have a "ticket" and the next server handshake message
3440 * is Finished; and 0 otherwise. It returns -1 upon an error.
3441 */
ssl3_check_finished(SSL * s)3442 static int ssl3_check_finished(SSL *s)
3443 {
3444 int ok = 0;
3445
3446 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb ||
3447 !s->session->tlsext_tick)
3448 return 0;
3449
3450 /* Need to permit this temporarily, in case the next message is Finished. */
3451 s->s3->flags |= SSL3_FLAGS_CCS_OK;
3452 /*
3453 * This function is called when we might get a Certificate message instead,
3454 * so permit appropriate message length.
3455 * We ignore the return value as we're only interested in the message type
3456 * and not its length.
3457 */
3458 s->method->ssl_get_message(s,
3459 SSL3_ST_CR_CERT_A,
3460 SSL3_ST_CR_CERT_B,
3461 -1, s->max_cert_list, &ok);
3462 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
3463
3464 if (!ok)
3465 return -1;
3466
3467 s->s3->tmp.reuse_message = 1;
3468
3469 if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
3470 return 1;
3471
3472 /* If we're not done, then the CCS arrived early and we should bail. */
3473 if (s->s3->change_cipher_spec) {
3474 SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY);
3475 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
3476 return -1;
3477 }
3478
3479 return 0;
3480 }
3481
3482 # ifndef OPENSSL_NO_NEXTPROTONEG
ssl3_send_next_proto(SSL * s)3483 int ssl3_send_next_proto(SSL *s)
3484 {
3485 unsigned int len, padding_len;
3486 unsigned char *d;
3487
3488 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) {
3489 len = s->next_proto_negotiated_len;
3490 padding_len = 32 - ((len + 2) % 32);
3491 d = (unsigned char *)s->init_buf->data;
3492 d[4] = len;
3493 memcpy(d + 5, s->next_proto_negotiated, len);
3494 d[5 + len] = padding_len;
3495 memset(d + 6 + len, 0, padding_len);
3496 *(d++) = SSL3_MT_NEXT_PROTO;
3497 l2n3(2 + len + padding_len, d);
3498 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3499 s->init_num = 4 + 2 + len + padding_len;
3500 s->init_off = 0;
3501 }
3502
3503 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3504 }
3505 #endif /* !OPENSSL_NO_NEXTPROTONEG */
3506 #endif /* !OPENSSL_NO_TLSEXT */
3507
ssl_do_client_cert_cb(SSL * s,X509 ** px509,EVP_PKEY ** ppkey)3508 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3509 {
3510 int i = 0;
3511 #ifndef OPENSSL_NO_ENGINE
3512 if (s->ctx->client_cert_engine) {
3513 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3514 SSL_get_client_CA_list(s),
3515 px509, ppkey, NULL, NULL, NULL);
3516 if (i != 0)
3517 return i;
3518 }
3519 #endif
3520 if (s->ctx->client_cert_cb)
3521 i = s->ctx->client_cert_cb(s, px509, ppkey);
3522 return i;
3523 }
3524