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[thirdparty/openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124 /* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include <openssl/buffer.h>
154 #include <openssl/rand.h>
155 #include <openssl/objects.h>
156 #include <openssl/evp.h>
157 #include <openssl/md5.h>
158 #ifndef OPENSSL_NO_DH
159 # include <openssl/dh.h>
160 #endif
161 #include <openssl/bn.h>
162 #ifndef OPENSSL_NO_ENGINE
163 # include <openssl/engine.h>
164 #endif
165
166 static int ssl_set_version(SSL *s);
167 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
168 #ifndef OPENSSL_NO_TLSEXT
169 static int ssl3_check_finished(SSL *s);
170 #endif
171 static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
172 unsigned char *p,
173 int (*put_cb) (const SSL_CIPHER *,
174 unsigned char *));
175
176
177 int ssl3_connect(SSL *s)
178 {
179 BUF_MEM *buf = NULL;
180 unsigned long Time = (unsigned long)time(NULL);
181 void (*cb) (const SSL *ssl, int type, int val) = NULL;
182 int ret = -1;
183 int new_state, state, skip = 0;
184
185 RAND_add(&Time, sizeof(Time), 0);
186 ERR_clear_error();
187 clear_sys_error();
188
189 if (s->info_callback != NULL)
190 cb = s->info_callback;
191 else if (s->ctx->info_callback != NULL)
192 cb = s->ctx->info_callback;
193
194 s->in_handshake++;
195 if (!SSL_in_init(s) || SSL_in_before(s)) {
196 if (!SSL_clear(s))
197 return -1;
198 }
199
200 #ifndef OPENSSL_NO_HEARTBEATS
201 /*
202 * If we're awaiting a HeartbeatResponse, pretend we already got and
203 * don't await it anymore, because Heartbeats don't make sense during
204 * handshakes anyway.
205 */
206 if (s->tlsext_hb_pending) {
207 s->tlsext_hb_pending = 0;
208 s->tlsext_hb_seq++;
209 }
210 #endif
211
212 for (;;) {
213 state = s->state;
214
215 switch (s->state) {
216 case SSL_ST_RENEGOTIATE:
217 s->renegotiate = 1;
218 s->state = SSL_ST_CONNECT;
219 s->ctx->stats.sess_connect_renegotiate++;
220 /* break */
221 case SSL_ST_BEFORE:
222 case SSL_ST_CONNECT:
223 case SSL_ST_BEFORE | SSL_ST_CONNECT:
224 case SSL_ST_OK | SSL_ST_CONNECT:
225
226 s->server = 0;
227 if (cb != NULL)
228 cb(s, SSL_CB_HANDSHAKE_START, 1);
229
230 if ((s->version >> 8) != SSL3_VERSION_MAJOR
231 && s->version != TLS_ANY_VERSION) {
232 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
233 s->state = SSL_ST_ERR;
234 ret = -1;
235 goto end;
236 }
237
238 if (s->version != TLS_ANY_VERSION &&
239 !ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
240 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
241 return -1;
242 }
243
244 /* s->version=SSL3_VERSION; */
245 s->type = SSL_ST_CONNECT;
246
247 if (s->init_buf == NULL) {
248 if ((buf = BUF_MEM_new()) == NULL) {
249 ret = -1;
250 s->state = SSL_ST_ERR;
251 goto end;
252 }
253 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
254 ret = -1;
255 s->state = SSL_ST_ERR;
256 goto end;
257 }
258 s->init_buf = buf;
259 buf = NULL;
260 }
261
262 if (!ssl3_setup_buffers(s)) {
263 ret = -1;
264 goto end;
265 }
266
267 /* setup buffing BIO */
268 if (!ssl_init_wbio_buffer(s, 0)) {
269 ret = -1;
270 s->state = SSL_ST_ERR;
271 goto end;
272 }
273
274 /* don't push the buffering BIO quite yet */
275
276 ssl3_init_finished_mac(s);
277
278 s->state = SSL3_ST_CW_CLNT_HELLO_A;
279 s->ctx->stats.sess_connect++;
280 s->init_num = 0;
281 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
282 /*
283 * Should have been reset by ssl3_get_finished, too.
284 */
285 s->s3->change_cipher_spec = 0;
286 break;
287
288 case SSL3_ST_CW_CLNT_HELLO_A:
289 case SSL3_ST_CW_CLNT_HELLO_B:
290
291 s->shutdown = 0;
292 ret = ssl3_client_hello(s);
293 if (ret <= 0)
294 goto end;
295 s->state = SSL3_ST_CR_SRVR_HELLO_A;
296 s->init_num = 0;
297
298 /* turn on buffering for the next lot of output */
299 if (s->bbio != s->wbio)
300 s->wbio = BIO_push(s->bbio, s->wbio);
301
302 break;
303
304 case SSL3_ST_CR_SRVR_HELLO_A:
305 case SSL3_ST_CR_SRVR_HELLO_B:
306 ret = ssl3_get_server_hello(s);
307 if (ret <= 0)
308 goto end;
309
310 if (s->hit) {
311 s->state = SSL3_ST_CR_FINISHED_A;
312 #ifndef OPENSSL_NO_TLSEXT
313 if (s->tlsext_ticket_expected) {
314 /* receive renewed session ticket */
315 s->state = SSL3_ST_CR_SESSION_TICKET_A;
316 }
317 #endif
318 } else {
319 s->state = SSL3_ST_CR_CERT_A;
320 }
321 s->init_num = 0;
322 break;
323 case SSL3_ST_CR_CERT_A:
324 case SSL3_ST_CR_CERT_B:
325 #ifndef OPENSSL_NO_TLSEXT
326 /* Noop (ret = 0) for everything but EAP-FAST. */
327 ret = ssl3_check_finished(s);
328 if (ret < 0)
329 goto end;
330 if (ret == 1) {
331 s->hit = 1;
332 s->state = SSL3_ST_CR_FINISHED_A;
333 s->init_num = 0;
334 break;
335 }
336 #endif
337 /* Check if it is anon DH/ECDH, SRP auth */
338 /* or PSK */
339 if (!
340 (s->s3->tmp.
341 new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
342 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
343 ret = ssl3_get_server_certificate(s);
344 if (ret <= 0)
345 goto end;
346 #ifndef OPENSSL_NO_TLSEXT
347 if (s->tlsext_status_expected)
348 s->state = SSL3_ST_CR_CERT_STATUS_A;
349 else
350 s->state = SSL3_ST_CR_KEY_EXCH_A;
351 } else {
352 skip = 1;
353 s->state = SSL3_ST_CR_KEY_EXCH_A;
354 }
355 #else
356 } else
357 skip = 1;
358
359 s->state = SSL3_ST_CR_KEY_EXCH_A;
360 #endif
361 s->init_num = 0;
362 break;
363
364 case SSL3_ST_CR_KEY_EXCH_A:
365 case SSL3_ST_CR_KEY_EXCH_B:
366 ret = ssl3_get_key_exchange(s);
367 if (ret <= 0)
368 goto end;
369 s->state = SSL3_ST_CR_CERT_REQ_A;
370 s->init_num = 0;
371
372 /*
373 * at this point we check that we have the required stuff from
374 * the server
375 */
376 if (!ssl3_check_cert_and_algorithm(s)) {
377 ret = -1;
378 s->state = SSL_ST_ERR;
379 goto end;
380 }
381 break;
382
383 case SSL3_ST_CR_CERT_REQ_A:
384 case SSL3_ST_CR_CERT_REQ_B:
385 ret = ssl3_get_certificate_request(s);
386 if (ret <= 0)
387 goto end;
388 s->state = SSL3_ST_CR_SRVR_DONE_A;
389 s->init_num = 0;
390 break;
391
392 case SSL3_ST_CR_SRVR_DONE_A:
393 case SSL3_ST_CR_SRVR_DONE_B:
394 ret = ssl3_get_server_done(s);
395 if (ret <= 0)
396 goto end;
397 #ifndef OPENSSL_NO_SRP
398 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
399 if ((ret = SRP_Calc_A_param(s)) <= 0) {
400 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC);
401 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
402 s->state = SSL_ST_ERR;
403 goto end;
404 }
405 }
406 #endif
407 if (s->s3->tmp.cert_req)
408 s->state = SSL3_ST_CW_CERT_A;
409 else
410 s->state = SSL3_ST_CW_KEY_EXCH_A;
411 s->init_num = 0;
412
413 break;
414
415 case SSL3_ST_CW_CERT_A:
416 case SSL3_ST_CW_CERT_B:
417 case SSL3_ST_CW_CERT_C:
418 case SSL3_ST_CW_CERT_D:
419 ret = ssl3_send_client_certificate(s);
420 if (ret <= 0)
421 goto end;
422 s->state = SSL3_ST_CW_KEY_EXCH_A;
423 s->init_num = 0;
424 break;
425
426 case SSL3_ST_CW_KEY_EXCH_A:
427 case SSL3_ST_CW_KEY_EXCH_B:
428 ret = ssl3_send_client_key_exchange(s);
429 if (ret <= 0)
430 goto end;
431 /*
432 * EAY EAY EAY need to check for DH fix cert sent back
433 */
434 /*
435 * For TLS, cert_req is set to 2, so a cert chain of nothing is
436 * sent, but no verify packet is sent
437 */
438 /*
439 * XXX: For now, we do not support client authentication in ECDH
440 * cipher suites with ECDH (rather than ECDSA) certificates. We
441 * need to skip the certificate verify message when client's
442 * ECDH public key is sent inside the client certificate.
443 */
444 if (s->s3->tmp.cert_req == 1) {
445 s->state = SSL3_ST_CW_CERT_VRFY_A;
446 } else {
447 s->state = SSL3_ST_CW_CHANGE_A;
448 }
449 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
450 s->state = SSL3_ST_CW_CHANGE_A;
451 }
452
453 s->init_num = 0;
454 break;
455
456 case SSL3_ST_CW_CERT_VRFY_A:
457 case SSL3_ST_CW_CERT_VRFY_B:
458 ret = ssl3_send_client_verify(s);
459 if (ret <= 0)
460 goto end;
461 s->state = SSL3_ST_CW_CHANGE_A;
462 s->init_num = 0;
463 break;
464
465 case SSL3_ST_CW_CHANGE_A:
466 case SSL3_ST_CW_CHANGE_B:
467 ret = ssl3_send_change_cipher_spec(s,
468 SSL3_ST_CW_CHANGE_A,
469 SSL3_ST_CW_CHANGE_B);
470 if (ret <= 0)
471 goto end;
472
473 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
474 s->state = SSL3_ST_CW_FINISHED_A;
475 #else
476 if (s->s3->next_proto_neg_seen)
477 s->state = SSL3_ST_CW_NEXT_PROTO_A;
478 else
479 s->state = SSL3_ST_CW_FINISHED_A;
480 #endif
481 s->init_num = 0;
482
483 s->session->cipher = s->s3->tmp.new_cipher;
484 #ifdef OPENSSL_NO_COMP
485 s->session->compress_meth = 0;
486 #else
487 if (s->s3->tmp.new_compression == NULL)
488 s->session->compress_meth = 0;
489 else
490 s->session->compress_meth = s->s3->tmp.new_compression->id;
491 #endif
492 if (!s->method->ssl3_enc->setup_key_block(s)) {
493 ret = -1;
494 s->state = SSL_ST_ERR;
495 goto end;
496 }
497
498 if (!s->method->ssl3_enc->change_cipher_state(s,
499 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
500 {
501 ret = -1;
502 s->state = SSL_ST_ERR;
503 goto end;
504 }
505
506 break;
507
508 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
509 case SSL3_ST_CW_NEXT_PROTO_A:
510 case SSL3_ST_CW_NEXT_PROTO_B:
511 ret = ssl3_send_next_proto(s);
512 if (ret <= 0)
513 goto end;
514 s->state = SSL3_ST_CW_FINISHED_A;
515 break;
516 #endif
517
518 case SSL3_ST_CW_FINISHED_A:
519 case SSL3_ST_CW_FINISHED_B:
520 ret = ssl3_send_finished(s,
521 SSL3_ST_CW_FINISHED_A,
522 SSL3_ST_CW_FINISHED_B,
523 s->method->
524 ssl3_enc->client_finished_label,
525 s->method->
526 ssl3_enc->client_finished_label_len);
527 if (ret <= 0)
528 goto end;
529 s->state = SSL3_ST_CW_FLUSH;
530
531 /* clear flags */
532 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
533 if (s->hit) {
534 s->s3->tmp.next_state = SSL_ST_OK;
535 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
536 s->state = SSL_ST_OK;
537 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
538 s->s3->delay_buf_pop_ret = 0;
539 }
540 } else {
541 #ifndef OPENSSL_NO_TLSEXT
542 /*
543 * Allow NewSessionTicket if ticket expected
544 */
545 if (s->tlsext_ticket_expected)
546 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
547 else
548 #endif
549
550 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
551 }
552 s->init_num = 0;
553 break;
554
555 #ifndef OPENSSL_NO_TLSEXT
556 case SSL3_ST_CR_SESSION_TICKET_A:
557 case SSL3_ST_CR_SESSION_TICKET_B:
558 ret = ssl3_get_new_session_ticket(s);
559 if (ret <= 0)
560 goto end;
561 s->state = SSL3_ST_CR_FINISHED_A;
562 s->init_num = 0;
563 break;
564
565 case SSL3_ST_CR_CERT_STATUS_A:
566 case SSL3_ST_CR_CERT_STATUS_B:
567 ret = ssl3_get_cert_status(s);
568 if (ret <= 0)
569 goto end;
570 s->state = SSL3_ST_CR_KEY_EXCH_A;
571 s->init_num = 0;
572 break;
573 #endif
574
575 case SSL3_ST_CR_FINISHED_A:
576 case SSL3_ST_CR_FINISHED_B:
577 if (!s->s3->change_cipher_spec)
578 s->s3->flags |= SSL3_FLAGS_CCS_OK;
579 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
580 SSL3_ST_CR_FINISHED_B);
581 if (ret <= 0)
582 goto end;
583
584 if (s->hit)
585 s->state = SSL3_ST_CW_CHANGE_A;
586 else
587 s->state = SSL_ST_OK;
588 s->init_num = 0;
589 break;
590
591 case SSL3_ST_CW_FLUSH:
592 s->rwstate = SSL_WRITING;
593 if (BIO_flush(s->wbio) <= 0) {
594 ret = -1;
595 goto end;
596 }
597 s->rwstate = SSL_NOTHING;
598 s->state = s->s3->tmp.next_state;
599 break;
600
601 case SSL_ST_OK:
602 /* clean a few things up */
603 ssl3_cleanup_key_block(s);
604 BUF_MEM_free(s->init_buf);
605 s->init_buf = NULL;
606
607 /*
608 * If we are not 'joining' the last two packets, remove the
609 * buffering now
610 */
611 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
612 ssl_free_wbio_buffer(s);
613 /* else do it later in ssl3_write */
614
615 s->init_num = 0;
616 s->renegotiate = 0;
617 s->new_session = 0;
618
619 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
620 if (s->hit)
621 s->ctx->stats.sess_hit++;
622
623 ret = 1;
624 /* s->server=0; */
625 s->handshake_func = ssl3_connect;
626 s->ctx->stats.sess_connect_good++;
627
628 if (cb != NULL)
629 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
630
631 goto end;
632 /* break; */
633
634 case SSL_ST_ERR:
635 default:
636 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
637 ret = -1;
638 goto end;
639 /* break; */
640 }
641
642 /* did we do anything */
643 if (!s->s3->tmp.reuse_message && !skip) {
644 if (s->debug) {
645 if ((ret = BIO_flush(s->wbio)) <= 0)
646 goto end;
647 }
648
649 if ((cb != NULL) && (s->state != state)) {
650 new_state = s->state;
651 s->state = state;
652 cb(s, SSL_CB_CONNECT_LOOP, 1);
653 s->state = new_state;
654 }
655 }
656 skip = 0;
657 }
658 end:
659 s->in_handshake--;
660 BUF_MEM_free(buf);
661 if (cb != NULL)
662 cb(s, SSL_CB_CONNECT_EXIT, ret);
663 return (ret);
664 }
665
666 /*
667 * Work out what version we should be using for the initial ClientHello if
668 * the version is currently set to (D)TLS_ANY_VERSION.
669 * Returns 1 on success
670 * Returns 0 on error
671 */
672 static int ssl_set_version(SSL *s)
673 {
674 unsigned long mask, options = s->options;
675
676 if (s->method->version == TLS_ANY_VERSION) {
677 /*
678 * SSL_OP_NO_X disables all protocols above X *if* there are
679 * some protocols below X enabled. This is required in order
680 * to maintain "version capability" vector contiguous. So
681 * that if application wants to disable TLS1.0 in favour of
682 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
683 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3.
684 */
685 mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1
686 #if !defined(OPENSSL_NO_SSL3)
687 | SSL_OP_NO_SSLv3
688 #endif
689 ;
690 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
691 if (options & SSL_OP_NO_TLSv1_2) {
692 if ((options & mask) != mask) {
693 s->version = TLS1_1_VERSION;
694 } else {
695 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE);
696 return 0;
697 }
698 } else {
699 s->version = TLS1_2_VERSION;
700 }
701 #else
702 if ((options & mask) == mask) {
703 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE);
704 return 0;
705 }
706 s->version = TLS1_1_VERSION;
707 #endif
708
709 mask &= ~SSL_OP_NO_TLSv1_1;
710 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
711 s->version = TLS1_VERSION;
712 mask &= ~SSL_OP_NO_TLSv1;
713 #if !defined(OPENSSL_NO_SSL3)
714 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
715 s->version = SSL3_VERSION;
716 #endif
717
718 if (s->version != TLS1_2_VERSION && tls1_suiteb(s)) {
719 SSLerr(SSL_F_SSL_SET_VERSION,
720 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
721 return 0;
722 }
723
724 if (s->version == SSL3_VERSION && FIPS_mode()) {
725 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
726 return 0;
727 }
728
729 } else if (s->method->version == DTLS_ANY_VERSION) {
730 /* Determine which DTLS version to use */
731 /* If DTLS 1.2 disabled correct the version number */
732 if (options & SSL_OP_NO_DTLSv1_2) {
733 if (tls1_suiteb(s)) {
734 SSLerr(SSL_F_SSL_SET_VERSION,
735 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
736 return 0;
737 }
738 /*
739 * Disabling all versions is silly: return an error.
740 */
741 if (options & SSL_OP_NO_DTLSv1) {
742 SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_WRONG_SSL_VERSION);
743 return 0;
744 }
745 /*
746 * Update method so we don't use any DTLS 1.2 features.
747 */
748 s->method = DTLSv1_client_method();
749 s->version = DTLS1_VERSION;
750 } else {
751 /*
752 * We only support one version: update method
753 */
754 if (options & SSL_OP_NO_DTLSv1)
755 s->method = DTLSv1_2_client_method();
756 s->version = DTLS1_2_VERSION;
757 }
758 }
759
760 s->client_version = s->version;
761
762 return 1;
763 }
764
765 int ssl3_client_hello(SSL *s)
766 {
767 unsigned char *buf;
768 unsigned char *p, *d;
769 int i;
770 unsigned long l;
771 int al = 0;
772 #ifndef OPENSSL_NO_COMP
773 int j;
774 SSL_COMP *comp;
775 #endif
776
777 buf = (unsigned char *)s->init_buf->data;
778 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
779 SSL_SESSION *sess = s->session;
780
781 /* Work out what SSL/TLS/DTLS version to use */
782 if (ssl_set_version(s) == 0)
783 goto err;
784
785 if ((sess == NULL) || (sess->ssl_version != s->version) ||
786 #ifdef OPENSSL_NO_TLSEXT
787 !sess->session_id_length ||
788 #else
789 /*
790 * In the case of EAP-FAST, we can have a pre-shared
791 * "ticket" without a session ID.
792 */
793 (!sess->session_id_length && !sess->tlsext_tick) ||
794 #endif
795 (sess->not_resumable)) {
796 if (!ssl_get_new_session(s, 0))
797 goto err;
798 }
799 /* else use the pre-loaded session */
800
801 p = s->s3->client_random;
802
803 /*
804 * for DTLS if client_random is initialized, reuse it, we are
805 * required to use same upon reply to HelloVerify
806 */
807 if (SSL_IS_DTLS(s)) {
808 size_t idx;
809 i = 1;
810 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
811 if (p[idx]) {
812 i = 0;
813 break;
814 }
815 }
816 } else
817 i = 1;
818
819 if (i && ssl_fill_hello_random(s, 0, p,
820 sizeof(s->s3->client_random)) <= 0)
821 goto err;
822
823 /* Do the message type and length last */
824 d = p = ssl_handshake_start(s);
825
826 /*-
827 * version indicates the negotiated version: for example from
828 * an SSLv2/v3 compatible client hello). The client_version
829 * field is the maximum version we permit and it is also
830 * used in RSA encrypted premaster secrets. Some servers can
831 * choke if we initially report a higher version then
832 * renegotiate to a lower one in the premaster secret. This
833 * didn't happen with TLS 1.0 as most servers supported it
834 * but it can with TLS 1.1 or later if the server only supports
835 * 1.0.
836 *
837 * Possible scenario with previous logic:
838 * 1. Client hello indicates TLS 1.2
839 * 2. Server hello says TLS 1.0
840 * 3. RSA encrypted premaster secret uses 1.2.
841 * 4. Handhaked proceeds using TLS 1.0.
842 * 5. Server sends hello request to renegotiate.
843 * 6. Client hello indicates TLS v1.0 as we now
844 * know that is maximum server supports.
845 * 7. Server chokes on RSA encrypted premaster secret
846 * containing version 1.0.
847 *
848 * For interoperability it should be OK to always use the
849 * maximum version we support in client hello and then rely
850 * on the checking of version to ensure the servers isn't
851 * being inconsistent: for example initially negotiating with
852 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
853 * client_version in client hello and not resetting it to
854 * the negotiated version.
855 */
856 *(p++) = s->client_version >> 8;
857 *(p++) = s->client_version & 0xff;
858
859 /* Random stuff */
860 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
861 p += SSL3_RANDOM_SIZE;
862
863 /* Session ID */
864 if (s->new_session)
865 i = 0;
866 else
867 i = s->session->session_id_length;
868 *(p++) = i;
869 if (i != 0) {
870 if (i > (int)sizeof(s->session->session_id)) {
871 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
872 goto err;
873 }
874 memcpy(p, s->session->session_id, i);
875 p += i;
876 }
877
878 /* cookie stuff for DTLS */
879 if (SSL_IS_DTLS(s)) {
880 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
881 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
882 goto err;
883 }
884 *(p++) = s->d1->cookie_len;
885 memcpy(p, s->d1->cookie, s->d1->cookie_len);
886 p += s->d1->cookie_len;
887 }
888
889 /* Ciphers supported */
890 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
891 if (i == 0) {
892 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
893 goto err;
894 }
895 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
896 /*
897 * Some servers hang if client hello > 256 bytes as hack workaround
898 * chop number of supported ciphers to keep it well below this if we
899 * use TLS v1.2
900 */
901 if (TLS1_get_version(s) >= TLS1_2_VERSION
902 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
903 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
904 #endif
905 s2n(i, p);
906 p += i;
907
908 /* COMPRESSION */
909 #ifdef OPENSSL_NO_COMP
910 *(p++) = 1;
911 #else
912
913 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
914 j = 0;
915 else
916 j = sk_SSL_COMP_num(s->ctx->comp_methods);
917 *(p++) = 1 + j;
918 for (i = 0; i < j; i++) {
919 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
920 *(p++) = comp->id;
921 }
922 #endif
923 *(p++) = 0; /* Add the NULL method */
924
925 #ifndef OPENSSL_NO_TLSEXT
926 /* TLS extensions */
927 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
928 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
929 goto err;
930 }
931 if ((p =
932 ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
933 &al)) == NULL) {
934 ssl3_send_alert(s, SSL3_AL_FATAL, al);
935 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
936 goto err;
937 }
938 #endif
939
940 l = p - d;
941 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l)) {
942 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
943 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
944 goto err;
945 }
946 s->state = SSL3_ST_CW_CLNT_HELLO_B;
947 }
948
949 /* SSL3_ST_CW_CLNT_HELLO_B */
950 return ssl_do_write(s);
951 err:
952 s->state = SSL_ST_ERR;
953 return (-1);
954 }
955
956 int ssl3_get_server_hello(SSL *s)
957 {
958 STACK_OF(SSL_CIPHER) *sk;
959 const SSL_CIPHER *c;
960 CERT *ct = s->cert;
961 unsigned char *p, *d;
962 int i, al = SSL_AD_INTERNAL_ERROR, ok;
963 unsigned int j;
964 long n;
965 #ifndef OPENSSL_NO_COMP
966 SSL_COMP *comp;
967 #endif
968 /*
969 * Hello verify request and/or server hello version may not match so set
970 * first packet if we're negotiating version.
971 */
972 if (SSL_IS_DTLS(s))
973 s->first_packet = 1;
974
975 n = s->method->ssl_get_message(s,
976 SSL3_ST_CR_SRVR_HELLO_A,
977 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
978
979 if (!ok)
980 return ((int)n);
981
982 if (SSL_IS_DTLS(s)) {
983 s->first_packet = 0;
984 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
985 if (s->d1->send_cookie == 0) {
986 s->s3->tmp.reuse_message = 1;
987 return 1;
988 } else { /* already sent a cookie */
989
990 al = SSL_AD_UNEXPECTED_MESSAGE;
991 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
992 goto f_err;
993 }
994 }
995 }
996
997 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
998 al = SSL_AD_UNEXPECTED_MESSAGE;
999 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
1000 goto f_err;
1001 }
1002
1003 d = p = (unsigned char *)s->init_msg;
1004
1005 if (s->method->version == TLS_ANY_VERSION) {
1006 int sversion = (p[0] << 8) | p[1];
1007
1008 #if TLS_MAX_VERSION != TLS1_2_VERSION
1009 #error Code needs updating for new TLS version
1010 #endif
1011 #ifndef OPENSSL_NO_SSL3
1012 if ((sversion == SSL3_VERSION) && !(s->options & SSL_OP_NO_SSLv3)) {
1013 if (FIPS_mode()) {
1014 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1015 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
1016 al = SSL_AD_PROTOCOL_VERSION;
1017 goto f_err;
1018 }
1019 s->method = SSLv3_client_method();
1020 } else
1021 #endif
1022 if ((sversion == TLS1_VERSION) && !(s->options & SSL_OP_NO_TLSv1)) {
1023 s->method = TLSv1_client_method();
1024 } else if ((sversion == TLS1_1_VERSION) &&
1025 !(s->options & SSL_OP_NO_TLSv1_1)) {
1026 s->method = TLSv1_1_client_method();
1027 } else if ((sversion == TLS1_2_VERSION) &&
1028 !(s->options & SSL_OP_NO_TLSv1_2)) {
1029 s->method = TLSv1_2_client_method();
1030 } else {
1031 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
1032 al = SSL_AD_PROTOCOL_VERSION;
1033 goto f_err;
1034 }
1035 s->session->ssl_version = s->version = s->method->version;
1036
1037 if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
1038 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_VERSION_TOO_LOW);
1039 al = SSL_AD_PROTOCOL_VERSION;
1040 goto f_err;
1041 }
1042 } else if (s->method->version == DTLS_ANY_VERSION) {
1043 /* Work out correct protocol version to use */
1044 int hversion = (p[0] << 8) | p[1];
1045 int options = s->options;
1046 if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2))
1047 s->method = DTLSv1_2_client_method();
1048 else if (tls1_suiteb(s)) {
1049 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1050 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1051 s->version = hversion;
1052 al = SSL_AD_PROTOCOL_VERSION;
1053 goto f_err;
1054 } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1))
1055 s->method = DTLSv1_client_method();
1056 else {
1057 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
1058 s->version = hversion;
1059 al = SSL_AD_PROTOCOL_VERSION;
1060 goto f_err;
1061 }
1062 s->version = s->method->version;
1063 } else if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
1064 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
1065 s->version = (s->version & 0xff00) | p[1];
1066 al = SSL_AD_PROTOCOL_VERSION;
1067 goto f_err;
1068 }
1069 p += 2;
1070
1071 /* load the server hello data */
1072 /* load the server random */
1073 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
1074 p += SSL3_RANDOM_SIZE;
1075
1076 s->hit = 0;
1077
1078 /* get the session-id */
1079 j = *(p++);
1080
1081 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
1082 al = SSL_AD_ILLEGAL_PARAMETER;
1083 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
1084 goto f_err;
1085 }
1086 #ifndef OPENSSL_NO_TLSEXT
1087 /*
1088 * Check if we can resume the session based on external pre-shared secret.
1089 * EAP-FAST (RFC 4851) supports two types of session resumption.
1090 * Resumption based on server-side state works with session IDs.
1091 * Resumption based on pre-shared Protected Access Credentials (PACs)
1092 * works by overriding the SessionTicket extension at the application
1093 * layer, and does not send a session ID. (We do not know whether EAP-FAST
1094 * servers would honour the session ID.) Therefore, the session ID alone
1095 * is not a reliable indicator of session resumption, so we first check if
1096 * we can resume, and later peek at the next handshake message to see if the
1097 * server wants to resume.
1098 */
1099 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb &&
1100 s->session->tlsext_tick) {
1101 SSL_CIPHER *pref_cipher = NULL;
1102 s->session->master_key_length = sizeof(s->session->master_key);
1103 if (s->tls_session_secret_cb(s, s->session->master_key,
1104 &s->session->master_key_length,
1105 NULL, &pref_cipher,
1106 s->tls_session_secret_cb_arg)) {
1107 s->session->cipher = pref_cipher ?
1108 pref_cipher : ssl_get_cipher_by_char(s, p + j);
1109 } else {
1110 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1111 al = SSL_AD_INTERNAL_ERROR;
1112 goto f_err;
1113 }
1114 }
1115 #endif /* OPENSSL_NO_TLSEXT */
1116
1117 if (j != 0 && j == s->session->session_id_length
1118 && memcmp(p, s->session->session_id, j) == 0) {
1119 if (s->sid_ctx_length != s->session->sid_ctx_length
1120 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
1121 /* actually a client application bug */
1122 al = SSL_AD_ILLEGAL_PARAMETER;
1123 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1124 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1125 goto f_err;
1126 }
1127 s->hit = 1;
1128 } else {
1129 /*
1130 * If we were trying for session-id reuse but the server
1131 * didn't echo the ID, make a new SSL_SESSION.
1132 * In the case of EAP-FAST and PAC, we do not send a session ID,
1133 * so the PAC-based session secret is always preserved. It'll be
1134 * overwritten if the server refuses resumption.
1135 */
1136 if (s->session->session_id_length > 0) {
1137 if (!ssl_get_new_session(s, 0)) {
1138 goto f_err;
1139 }
1140 }
1141 s->session->session_id_length = j;
1142 memcpy(s->session->session_id, p, j); /* j could be 0 */
1143 }
1144 p += j;
1145 c = ssl_get_cipher_by_char(s, p);
1146 if (c == NULL) {
1147 /* unknown cipher */
1148 al = SSL_AD_ILLEGAL_PARAMETER;
1149 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
1150 goto f_err;
1151 }
1152 /* Set version disabled mask now we know version */
1153 if (!SSL_USE_TLS1_2_CIPHERS(s))
1154 ct->mask_ssl = SSL_TLSV1_2;
1155 else
1156 ct->mask_ssl = 0;
1157 /*
1158 * If it is a disabled cipher we didn't send it in client hello, so
1159 * return an error.
1160 */
1161 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) {
1162 al = SSL_AD_ILLEGAL_PARAMETER;
1163 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1164 goto f_err;
1165 }
1166 p += ssl_put_cipher_by_char(s, NULL, NULL);
1167
1168 sk = ssl_get_ciphers_by_id(s);
1169 i = sk_SSL_CIPHER_find(sk, c);
1170 if (i < 0) {
1171 /* we did not say we would use this cipher */
1172 al = SSL_AD_ILLEGAL_PARAMETER;
1173 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1174 goto f_err;
1175 }
1176
1177 /*
1178 * Depending on the session caching (internal/external), the cipher
1179 * and/or cipher_id values may not be set. Make sure that cipher_id is
1180 * set and use it for comparison.
1181 */
1182 if (s->session->cipher)
1183 s->session->cipher_id = s->session->cipher->id;
1184 if (s->hit && (s->session->cipher_id != c->id)) {
1185 al = SSL_AD_ILLEGAL_PARAMETER;
1186 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1187 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1188 goto f_err;
1189 }
1190 s->s3->tmp.new_cipher = c;
1191 /*
1192 * Don't digest cached records if no sigalgs: we may need them for client
1193 * authentication.
1194 */
1195 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1196 goto f_err;
1197 /* lets get the compression algorithm */
1198 /* COMPRESSION */
1199 #ifdef OPENSSL_NO_COMP
1200 if (*(p++) != 0) {
1201 al = SSL_AD_ILLEGAL_PARAMETER;
1202 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1203 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1204 goto f_err;
1205 }
1206 /*
1207 * If compression is disabled we'd better not try to resume a session
1208 * using compression.
1209 */
1210 if (s->session->compress_meth != 0) {
1211 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1212 goto f_err;
1213 }
1214 #else
1215 j = *(p++);
1216 if (s->hit && j != s->session->compress_meth) {
1217 al = SSL_AD_ILLEGAL_PARAMETER;
1218 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1219 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1220 goto f_err;
1221 }
1222 if (j == 0)
1223 comp = NULL;
1224 else if (!ssl_allow_compression(s)) {
1225 al = SSL_AD_ILLEGAL_PARAMETER;
1226 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
1227 goto f_err;
1228 } else
1229 comp = ssl3_comp_find(s->ctx->comp_methods, j);
1230
1231 if ((j != 0) && (comp == NULL)) {
1232 al = SSL_AD_ILLEGAL_PARAMETER;
1233 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1234 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1235 goto f_err;
1236 } else {
1237 s->s3->tmp.new_compression = comp;
1238 }
1239 #endif
1240
1241 #ifndef OPENSSL_NO_TLSEXT
1242 /* TLS extensions */
1243 if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) {
1244 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
1245 goto err;
1246 }
1247 #endif
1248
1249 if (p != (d + n)) {
1250 /* wrong packet length */
1251 al = SSL_AD_DECODE_ERROR;
1252 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
1253 goto f_err;
1254 }
1255
1256 return (1);
1257 f_err:
1258 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1259 err:
1260 s->state = SSL_ST_ERR;
1261 return (-1);
1262 }
1263
1264 int ssl3_get_server_certificate(SSL *s)
1265 {
1266 int al, i, ok, ret = -1, exp_idx;
1267 unsigned long n, nc, llen, l;
1268 X509 *x = NULL;
1269 const unsigned char *q, *p;
1270 unsigned char *d;
1271 STACK_OF(X509) *sk = NULL;
1272 SESS_CERT *sc;
1273 EVP_PKEY *pkey = NULL;
1274
1275 n = s->method->ssl_get_message(s,
1276 SSL3_ST_CR_CERT_A,
1277 SSL3_ST_CR_CERT_B,
1278 -1, s->max_cert_list, &ok);
1279
1280 if (!ok)
1281 return ((int)n);
1282
1283 if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) {
1284 s->s3->tmp.reuse_message = 1;
1285 return (1);
1286 }
1287
1288 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1289 al = SSL_AD_UNEXPECTED_MESSAGE;
1290 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
1291 goto f_err;
1292 }
1293 p = d = (unsigned char *)s->init_msg;
1294
1295 if ((sk = sk_X509_new_null()) == NULL) {
1296 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1297 goto err;
1298 }
1299
1300 n2l3(p, llen);
1301 if (llen + 3 != n) {
1302 al = SSL_AD_DECODE_ERROR;
1303 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
1304 goto f_err;
1305 }
1306 for (nc = 0; nc < llen;) {
1307 n2l3(p, l);
1308 if ((l + nc + 3) > llen) {
1309 al = SSL_AD_DECODE_ERROR;
1310 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1311 SSL_R_CERT_LENGTH_MISMATCH);
1312 goto f_err;
1313 }
1314
1315 q = p;
1316 x = d2i_X509(NULL, &q, l);
1317 if (x == NULL) {
1318 al = SSL_AD_BAD_CERTIFICATE;
1319 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
1320 goto f_err;
1321 }
1322 if (q != (p + l)) {
1323 al = SSL_AD_DECODE_ERROR;
1324 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1325 SSL_R_CERT_LENGTH_MISMATCH);
1326 goto f_err;
1327 }
1328 if (!sk_X509_push(sk, x)) {
1329 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1330 goto err;
1331 }
1332 x = NULL;
1333 nc += l + 3;
1334 p = q;
1335 }
1336
1337 i = ssl_verify_cert_chain(s, sk);
1338 if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) {
1339 al = ssl_verify_alarm_type(s->verify_result);
1340 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1341 SSL_R_CERTIFICATE_VERIFY_FAILED);
1342 goto f_err;
1343 }
1344 ERR_clear_error(); /* but we keep s->verify_result */
1345 if (i > 1) {
1346 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1347 al = SSL_AD_HANDSHAKE_FAILURE;
1348 goto f_err;
1349 }
1350
1351 sc = ssl_sess_cert_new();
1352 if (sc == NULL)
1353 goto err;
1354
1355 ssl_sess_cert_free(s->session->sess_cert);
1356 s->session->sess_cert = sc;
1357
1358 sc->cert_chain = sk;
1359 /*
1360 * Inconsistency alert: cert_chain does include the peer's certificate,
1361 * which we don't include in s3_srvr.c
1362 */
1363 x = sk_X509_value(sk, 0);
1364 sk = NULL;
1365 /*
1366 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1367 */
1368
1369 pkey = X509_get_pubkey(x);
1370
1371 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
1372 x = NULL;
1373 al = SSL3_AL_FATAL;
1374 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1375 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1376 goto f_err;
1377 }
1378
1379 i = ssl_cert_type(x, pkey);
1380 if (i < 0) {
1381 x = NULL;
1382 al = SSL3_AL_FATAL;
1383 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1384 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1385 goto f_err;
1386 }
1387
1388 exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1389 if (exp_idx >= 0 && i != exp_idx) {
1390 x = NULL;
1391 al = SSL_AD_ILLEGAL_PARAMETER;
1392 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1393 SSL_R_WRONG_CERTIFICATE_TYPE);
1394 goto f_err;
1395 }
1396 sc->peer_cert_type = i;
1397 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1398 /*
1399 * Why would the following ever happen? We just created sc a couple
1400 * of lines ago.
1401 */
1402 X509_free(sc->peer_pkeys[i].x509);
1403 sc->peer_pkeys[i].x509 = x;
1404 sc->peer_key = &(sc->peer_pkeys[i]);
1405
1406 X509_free(s->session->peer);
1407 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1408 s->session->peer = x;
1409 s->session->verify_result = s->verify_result;
1410
1411 x = NULL;
1412 ret = 1;
1413 goto done;
1414
1415 f_err:
1416 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1417 err:
1418 s->state = SSL_ST_ERR;
1419 done:
1420 EVP_PKEY_free(pkey);
1421 X509_free(x);
1422 sk_X509_pop_free(sk, X509_free);
1423 return (ret);
1424 }
1425
1426 int ssl3_get_key_exchange(SSL *s)
1427 {
1428 #ifndef OPENSSL_NO_RSA
1429 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1430 #endif
1431 EVP_MD_CTX md_ctx;
1432 unsigned char *param, *p;
1433 int al, j, ok;
1434 long i, param_len, n, alg_k, alg_a;
1435 EVP_PKEY *pkey = NULL;
1436 const EVP_MD *md = NULL;
1437 #ifndef OPENSSL_NO_RSA
1438 RSA *rsa = NULL;
1439 #endif
1440 #ifndef OPENSSL_NO_DH
1441 DH *dh = NULL;
1442 #endif
1443 #ifndef OPENSSL_NO_EC
1444 EC_KEY *ecdh = NULL;
1445 BN_CTX *bn_ctx = NULL;
1446 EC_POINT *srvr_ecpoint = NULL;
1447 int curve_nid = 0;
1448 int encoded_pt_len = 0;
1449 #endif
1450
1451 EVP_MD_CTX_init(&md_ctx);
1452
1453 /*
1454 * use same message size as in ssl3_get_certificate_request() as
1455 * ServerKeyExchange message may be skipped
1456 */
1457 n = s->method->ssl_get_message(s,
1458 SSL3_ST_CR_KEY_EXCH_A,
1459 SSL3_ST_CR_KEY_EXCH_B,
1460 -1, s->max_cert_list, &ok);
1461 if (!ok)
1462 return ((int)n);
1463
1464 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1465
1466 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1467 /*
1468 * Can't skip server key exchange if this is an ephemeral
1469 * ciphersuite.
1470 */
1471 if (alg_k & (SSL_kDHE | SSL_kECDHE)) {
1472 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1473 al = SSL_AD_UNEXPECTED_MESSAGE;
1474 goto f_err;
1475 }
1476 #ifndef OPENSSL_NO_PSK
1477 /*
1478 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no
1479 * identity hint is sent. Set session->sess_cert anyway to avoid
1480 * problems later.
1481 */
1482 if (alg_k & SSL_kPSK) {
1483 s->session->sess_cert = ssl_sess_cert_new();
1484 OPENSSL_free(s->ctx->psk_identity_hint);
1485 s->ctx->psk_identity_hint = NULL;
1486 }
1487 #endif
1488 s->s3->tmp.reuse_message = 1;
1489 return (1);
1490 }
1491
1492 param = p = (unsigned char *)s->init_msg;
1493 if (s->session->sess_cert != NULL) {
1494 #ifndef OPENSSL_NO_RSA
1495 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1496 s->session->sess_cert->peer_rsa_tmp = NULL;
1497 #endif
1498 #ifndef OPENSSL_NO_DH
1499 DH_free(s->session->sess_cert->peer_dh_tmp);
1500 s->session->sess_cert->peer_dh_tmp = NULL;
1501 #endif
1502 #ifndef OPENSSL_NO_EC
1503 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1504 s->session->sess_cert->peer_ecdh_tmp = NULL;
1505 #endif
1506 } else {
1507 s->session->sess_cert = ssl_sess_cert_new();
1508 }
1509
1510 /* Total length of the parameters including the length prefix */
1511 param_len = 0;
1512
1513 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1514
1515 al = SSL_AD_DECODE_ERROR;
1516
1517 #ifndef OPENSSL_NO_PSK
1518 if (alg_k & SSL_kPSK) {
1519 char tmp_id_hint[PSK_MAX_IDENTITY_LEN + 1];
1520
1521 param_len = 2;
1522 if (param_len > n) {
1523 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1524 goto f_err;
1525 }
1526 n2s(p, i);
1527
1528 /*
1529 * Store PSK identity hint for later use, hint is used in
1530 * ssl3_send_client_key_exchange. Assume that the maximum length of
1531 * a PSK identity hint can be as long as the maximum length of a PSK
1532 * identity.
1533 */
1534 if (i > PSK_MAX_IDENTITY_LEN) {
1535 al = SSL_AD_HANDSHAKE_FAILURE;
1536 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
1537 goto f_err;
1538 }
1539 if (i > n - param_len) {
1540 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1541 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1542 goto f_err;
1543 }
1544 param_len += i;
1545
1546 /*
1547 * If received PSK identity hint contains NULL characters, the hint
1548 * is truncated from the first NULL. p may not be ending with NULL,
1549 * so create a NULL-terminated string.
1550 */
1551 memcpy(tmp_id_hint, p, i);
1552 memset(tmp_id_hint + i, 0, PSK_MAX_IDENTITY_LEN + 1 - i);
1553 OPENSSL_free(s->ctx->psk_identity_hint);
1554 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1555 if (s->ctx->psk_identity_hint == NULL) {
1556 al = SSL_AD_HANDSHAKE_FAILURE;
1557 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1558 goto f_err;
1559 }
1560
1561 p += i;
1562 n -= param_len;
1563 } else
1564 #endif /* !OPENSSL_NO_PSK */
1565 #ifndef OPENSSL_NO_SRP
1566 if (alg_k & SSL_kSRP) {
1567 param_len = 2;
1568 if (param_len > n) {
1569 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1570 goto f_err;
1571 }
1572 n2s(p, i);
1573
1574 if (i > n - param_len) {
1575 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
1576 goto f_err;
1577 }
1578 param_len += i;
1579
1580 if ((s->srp_ctx.N = BN_bin2bn(p, i, NULL)) == NULL) {
1581 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1582 goto err;
1583 }
1584 p += i;
1585
1586 if (2 > n - param_len) {
1587 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1588 goto f_err;
1589 }
1590 param_len += 2;
1591
1592 n2s(p, i);
1593
1594 if (i > n - param_len) {
1595 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
1596 goto f_err;
1597 }
1598 param_len += i;
1599
1600 if ((s->srp_ctx.g = BN_bin2bn(p, i, NULL)) == NULL) {
1601 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1602 goto err;
1603 }
1604 p += i;
1605
1606 if (1 > n - param_len) {
1607 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1608 goto f_err;
1609 }
1610 param_len += 1;
1611
1612 i = (unsigned int)(p[0]);
1613 p++;
1614
1615 if (i > n - param_len) {
1616 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
1617 goto f_err;
1618 }
1619 param_len += i;
1620
1621 if ((s->srp_ctx.s = BN_bin2bn(p, i, NULL)) == NULL) {
1622 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1623 goto err;
1624 }
1625 p += i;
1626
1627 if (2 > n - param_len) {
1628 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1629 goto f_err;
1630 }
1631 param_len += 2;
1632
1633 n2s(p, i);
1634
1635 if (i > n - param_len) {
1636 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
1637 goto f_err;
1638 }
1639 param_len += i;
1640
1641 if ((s->srp_ctx.B = BN_bin2bn(p, i, NULL)) == NULL) {
1642 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1643 goto err;
1644 }
1645 p += i;
1646 n -= param_len;
1647
1648 if (!srp_verify_server_param(s, &al)) {
1649 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
1650 goto f_err;
1651 }
1652
1653 /* We must check if there is a certificate */
1654 # ifndef OPENSSL_NO_RSA
1655 if (alg_a & SSL_aRSA)
1656 pkey =
1657 X509_get_pubkey(s->session->
1658 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1659 # else
1660 if (0) ;
1661 # endif
1662 # ifndef OPENSSL_NO_DSA
1663 else if (alg_a & SSL_aDSS)
1664 pkey =
1665 X509_get_pubkey(s->session->
1666 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1667 x509);
1668 # endif
1669 } else
1670 #endif /* !OPENSSL_NO_SRP */
1671 #ifndef OPENSSL_NO_RSA
1672 if (alg_k & SSL_kRSA) {
1673 /* Temporary RSA keys only allowed in export ciphersuites */
1674 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1675 al = SSL_AD_UNEXPECTED_MESSAGE;
1676 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1677 goto f_err;
1678 }
1679 if ((rsa = RSA_new()) == NULL) {
1680 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1681 goto err;
1682 }
1683
1684 param_len = 2;
1685 if (param_len > n) {
1686 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1687 goto f_err;
1688 }
1689 n2s(p, i);
1690
1691 if (i > n - param_len) {
1692 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1693 goto f_err;
1694 }
1695 param_len += i;
1696
1697 if ((rsa->n = BN_bin2bn(p, i, rsa->n)) == NULL) {
1698 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1699 goto err;
1700 }
1701 p += i;
1702
1703 if (2 > n - param_len) {
1704 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1705 goto f_err;
1706 }
1707 param_len += 2;
1708
1709 n2s(p, i);
1710
1711 if (i > n - param_len) {
1712 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1713 goto f_err;
1714 }
1715 param_len += i;
1716
1717 if ((rsa->e = BN_bin2bn(p, i, rsa->e)) == NULL) {
1718 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1719 goto err;
1720 }
1721 p += i;
1722 n -= param_len;
1723
1724 /* this should be because we are using an export cipher */
1725 if (alg_a & SSL_aRSA)
1726 pkey =
1727 X509_get_pubkey(s->session->
1728 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1729 else {
1730 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1731 goto err;
1732 }
1733 s->session->sess_cert->peer_rsa_tmp = rsa;
1734 rsa = NULL;
1735 }
1736 #else /* OPENSSL_NO_RSA */
1737 if (0) ;
1738 #endif
1739 #ifndef OPENSSL_NO_DH
1740 else if (alg_k & SSL_kDHE) {
1741 if ((dh = DH_new()) == NULL) {
1742 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1743 goto err;
1744 }
1745
1746 param_len = 2;
1747 if (param_len > n) {
1748 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1749 goto f_err;
1750 }
1751 n2s(p, i);
1752
1753 if (i > n - param_len) {
1754 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1755 goto f_err;
1756 }
1757 param_len += i;
1758
1759 if ((dh->p = BN_bin2bn(p, i, NULL)) == NULL) {
1760 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1761 goto err;
1762 }
1763 p += i;
1764
1765 if (2 > n - param_len) {
1766 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1767 goto f_err;
1768 }
1769 param_len += 2;
1770
1771 n2s(p, i);
1772
1773 if (i > n - param_len) {
1774 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1775 goto f_err;
1776 }
1777 param_len += i;
1778
1779 if ((dh->g = BN_bin2bn(p, i, NULL)) == NULL) {
1780 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1781 goto err;
1782 }
1783 p += i;
1784
1785 if (2 > n - param_len) {
1786 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1787 goto f_err;
1788 }
1789 param_len += 2;
1790
1791 n2s(p, i);
1792
1793 if (i > n - param_len) {
1794 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1795 goto f_err;
1796 }
1797 param_len += i;
1798
1799 if ((dh->pub_key = BN_bin2bn(p, i, NULL)) == NULL) {
1800 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1801 goto err;
1802 }
1803 p += i;
1804 n -= param_len;
1805
1806 if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) {
1807 al = SSL_AD_HANDSHAKE_FAILURE;
1808 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DH_KEY_TOO_SMALL);
1809 goto f_err;
1810 }
1811 # ifndef OPENSSL_NO_RSA
1812 if (alg_a & SSL_aRSA)
1813 pkey =
1814 X509_get_pubkey(s->session->
1815 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1816 # else
1817 if (0) ;
1818 # endif
1819 # ifndef OPENSSL_NO_DSA
1820 else if (alg_a & SSL_aDSS)
1821 pkey =
1822 X509_get_pubkey(s->session->
1823 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1824 x509);
1825 # endif
1826 /* else anonymous DH, so no certificate or pkey. */
1827
1828 s->session->sess_cert->peer_dh_tmp = dh;
1829 dh = NULL;
1830 }
1831 #endif /* !OPENSSL_NO_DH */
1832
1833 #ifndef OPENSSL_NO_EC
1834 else if (alg_k & SSL_kECDHE) {
1835 EC_GROUP *ngroup;
1836 const EC_GROUP *group;
1837
1838 if ((ecdh = EC_KEY_new()) == NULL) {
1839 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1840 goto err;
1841 }
1842
1843 /*
1844 * Extract elliptic curve parameters and the server's ephemeral ECDH
1845 * public key. Keep accumulating lengths of various components in
1846 * param_len and make sure it never exceeds n.
1847 */
1848
1849 /*
1850 * XXX: For now we only support named (not generic) curves and the
1851 * ECParameters in this case is just three bytes. We also need one
1852 * byte for the length of the encoded point
1853 */
1854 param_len = 4;
1855 if (param_len > n) {
1856 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1857 goto f_err;
1858 }
1859 /*
1860 * Check curve is one of our preferences, if not server has sent an
1861 * invalid curve. ECParameters is 3 bytes.
1862 */
1863 if (!tls1_check_curve(s, p, 3)) {
1864 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
1865 goto f_err;
1866 }
1867
1868 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) {
1869 al = SSL_AD_INTERNAL_ERROR;
1870 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1871 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1872 goto f_err;
1873 }
1874
1875 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1876 if (ngroup == NULL) {
1877 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1878 goto err;
1879 }
1880 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1881 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1882 goto err;
1883 }
1884 EC_GROUP_free(ngroup);
1885
1886 group = EC_KEY_get0_group(ecdh);
1887
1888 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1889 (EC_GROUP_get_degree(group) > 163)) {
1890 al = SSL_AD_EXPORT_RESTRICTION;
1891 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1892 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1893 goto f_err;
1894 }
1895
1896 p += 3;
1897
1898 /* Next, get the encoded ECPoint */
1899 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1900 ((bn_ctx = BN_CTX_new()) == NULL)) {
1901 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1902 goto err;
1903 }
1904
1905 encoded_pt_len = *p; /* length of encoded point */
1906 p += 1;
1907
1908 if ((encoded_pt_len > n - param_len) ||
1909 (EC_POINT_oct2point(group, srvr_ecpoint,
1910 p, encoded_pt_len, bn_ctx) == 0)) {
1911 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1912 goto f_err;
1913 }
1914 param_len += encoded_pt_len;
1915
1916 n -= param_len;
1917 p += encoded_pt_len;
1918
1919 /*
1920 * The ECC/TLS specification does not mention the use of DSA to sign
1921 * ECParameters in the server key exchange message. We do support RSA
1922 * and ECDSA.
1923 */
1924 if (0) ;
1925 # ifndef OPENSSL_NO_RSA
1926 else if (alg_a & SSL_aRSA)
1927 pkey =
1928 X509_get_pubkey(s->session->
1929 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1930 # endif
1931 # ifndef OPENSSL_NO_EC
1932 else if (alg_a & SSL_aECDSA)
1933 pkey =
1934 X509_get_pubkey(s->session->
1935 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1936 # endif
1937 /* else anonymous ECDH, so no certificate or pkey. */
1938 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1939 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1940 ecdh = NULL;
1941 BN_CTX_free(bn_ctx);
1942 bn_ctx = NULL;
1943 EC_POINT_free(srvr_ecpoint);
1944 srvr_ecpoint = NULL;
1945 } else if (alg_k) {
1946 al = SSL_AD_UNEXPECTED_MESSAGE;
1947 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1948 goto f_err;
1949 }
1950 #endif /* !OPENSSL_NO_EC */
1951
1952 /* p points to the next byte, there are 'n' bytes left */
1953
1954 /* if it was signed, check the signature */
1955 if (pkey != NULL) {
1956 if (SSL_USE_SIGALGS(s)) {
1957 int rv;
1958 if (2 > n) {
1959 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1960 goto f_err;
1961 }
1962 rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1963 if (rv == -1)
1964 goto err;
1965 else if (rv == 0) {
1966 goto f_err;
1967 }
1968 #ifdef SSL_DEBUG
1969 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1970 #endif
1971 p += 2;
1972 n -= 2;
1973 } else
1974 md = EVP_sha1();
1975
1976 if (2 > n) {
1977 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1978 goto f_err;
1979 }
1980 n2s(p, i);
1981 n -= 2;
1982 j = EVP_PKEY_size(pkey);
1983
1984 /*
1985 * Check signature length. If n is 0 then signature is empty
1986 */
1987 if ((i != n) || (n > j) || (n <= 0)) {
1988 /* wrong packet length */
1989 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1990 goto f_err;
1991 }
1992 #ifndef OPENSSL_NO_RSA
1993 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
1994 int num;
1995 unsigned int size;
1996
1997 j = 0;
1998 q = md_buf;
1999 for (num = 2; num > 0; num--) {
2000 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2001 EVP_DigestInit_ex(&md_ctx, (num == 2)
2002 ? s->ctx->md5 : s->ctx->sha1, NULL);
2003 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
2004 SSL3_RANDOM_SIZE);
2005 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
2006 SSL3_RANDOM_SIZE);
2007 EVP_DigestUpdate(&md_ctx, param, param_len);
2008 EVP_DigestFinal_ex(&md_ctx, q, &size);
2009 q += size;
2010 j += size;
2011 }
2012 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
2013 if (i < 0) {
2014 al = SSL_AD_DECRYPT_ERROR;
2015 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
2016 goto f_err;
2017 }
2018 if (i == 0) {
2019 /* bad signature */
2020 al = SSL_AD_DECRYPT_ERROR;
2021 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
2022 goto f_err;
2023 }
2024 } else
2025 #endif
2026 {
2027 EVP_VerifyInit_ex(&md_ctx, md, NULL);
2028 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
2029 SSL3_RANDOM_SIZE);
2030 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
2031 SSL3_RANDOM_SIZE);
2032 EVP_VerifyUpdate(&md_ctx, param, param_len);
2033 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
2034 /* bad signature */
2035 al = SSL_AD_DECRYPT_ERROR;
2036 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
2037 goto f_err;
2038 }
2039 }
2040 } else {
2041 /* aNULL, aSRP or kPSK do not need public keys */
2042 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) {
2043 /* Might be wrong key type, check it */
2044 if (ssl3_check_cert_and_algorithm(s))
2045 /* Otherwise this shouldn't happen */
2046 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2047 goto err;
2048 }
2049 /* still data left over */
2050 if (n != 0) {
2051 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
2052 goto f_err;
2053 }
2054 }
2055 EVP_PKEY_free(pkey);
2056 EVP_MD_CTX_cleanup(&md_ctx);
2057 return (1);
2058 f_err:
2059 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2060 err:
2061 EVP_PKEY_free(pkey);
2062 #ifndef OPENSSL_NO_RSA
2063 RSA_free(rsa);
2064 #endif
2065 #ifndef OPENSSL_NO_DH
2066 DH_free(dh);
2067 #endif
2068 #ifndef OPENSSL_NO_EC
2069 BN_CTX_free(bn_ctx);
2070 EC_POINT_free(srvr_ecpoint);
2071 EC_KEY_free(ecdh);
2072 #endif
2073 EVP_MD_CTX_cleanup(&md_ctx);
2074 s->state = SSL_ST_ERR;
2075 return (-1);
2076 }
2077
2078 int ssl3_get_certificate_request(SSL *s)
2079 {
2080 int ok, ret = 0;
2081 unsigned long n, nc, l;
2082 unsigned int llen, ctype_num, i;
2083 X509_NAME *xn = NULL;
2084 const unsigned char *p, *q;
2085 unsigned char *d;
2086 STACK_OF(X509_NAME) *ca_sk = NULL;
2087
2088 n = s->method->ssl_get_message(s,
2089 SSL3_ST_CR_CERT_REQ_A,
2090 SSL3_ST_CR_CERT_REQ_B,
2091 -1, s->max_cert_list, &ok);
2092
2093 if (!ok)
2094 return ((int)n);
2095
2096 s->s3->tmp.cert_req = 0;
2097
2098 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
2099 s->s3->tmp.reuse_message = 1;
2100 /*
2101 * If we get here we don't need any cached handshake records as we
2102 * wont be doing client auth.
2103 */
2104 if (s->s3->handshake_buffer) {
2105 if (!ssl3_digest_cached_records(s))
2106 goto err;
2107 }
2108 return (1);
2109 }
2110
2111 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
2112 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2113 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
2114 goto err;
2115 }
2116
2117 /* TLS does not like anon-DH with client cert */
2118 if (s->version > SSL3_VERSION) {
2119 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
2120 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2121 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2122 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2123 goto err;
2124 }
2125 }
2126
2127 p = d = (unsigned char *)s->init_msg;
2128
2129 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
2130 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2131 goto err;
2132 }
2133
2134 /* get the certificate types */
2135 ctype_num = *(p++);
2136 OPENSSL_free(s->cert->ctypes);
2137 s->cert->ctypes = NULL;
2138 if (ctype_num > SSL3_CT_NUMBER) {
2139 /* If we exceed static buffer copy all to cert structure */
2140 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2141 if (s->cert->ctypes == NULL) {
2142 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2143 goto err;
2144 }
2145 memcpy(s->cert->ctypes, p, ctype_num);
2146 s->cert->ctype_num = (size_t)ctype_num;
2147 ctype_num = SSL3_CT_NUMBER;
2148 }
2149 for (i = 0; i < ctype_num; i++)
2150 s->s3->tmp.ctype[i] = p[i];
2151 p += p[-1];
2152 if (SSL_USE_SIGALGS(s)) {
2153 n2s(p, llen);
2154 /*
2155 * Check we have enough room for signature algorithms and following
2156 * length value.
2157 */
2158 if ((unsigned long)(p - d + llen + 2) > n) {
2159 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2160 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2161 SSL_R_DATA_LENGTH_TOO_LONG);
2162 goto err;
2163 }
2164 /* Clear certificate digests and validity flags */
2165 for (i = 0; i < SSL_PKEY_NUM; i++) {
2166 s->cert->pkeys[i].digest = NULL;
2167 s->cert->pkeys[i].valid_flags = 0;
2168 }
2169 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) {
2170 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2171 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2172 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2173 goto err;
2174 }
2175 if (!tls1_process_sigalgs(s)) {
2176 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2177 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2178 goto err;
2179 }
2180 p += llen;
2181 }
2182
2183 /* get the CA RDNs */
2184 n2s(p, llen);
2185
2186 if ((unsigned long)(p - d + llen) != n) {
2187 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2188 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
2189 goto err;
2190 }
2191
2192 for (nc = 0; nc < llen;) {
2193 n2s(p, l);
2194 if ((l + nc + 2) > llen) {
2195 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2196 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
2197 goto err;
2198 }
2199
2200 q = p;
2201
2202 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
2203 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2204 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
2205 goto err;
2206 }
2207
2208 if (q != (p + l)) {
2209 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2210 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2211 SSL_R_CA_DN_LENGTH_MISMATCH);
2212 goto err;
2213 }
2214 if (!sk_X509_NAME_push(ca_sk, xn)) {
2215 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2216 goto err;
2217 }
2218
2219 p += l;
2220 nc += l + 2;
2221 }
2222
2223 /* we should setup a certificate to return.... */
2224 s->s3->tmp.cert_req = 1;
2225 s->s3->tmp.ctype_num = ctype_num;
2226 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
2227 s->s3->tmp.ca_names = ca_sk;
2228 ca_sk = NULL;
2229
2230 ret = 1;
2231 goto done;
2232 err:
2233 s->state = SSL_ST_ERR;
2234 done:
2235 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
2236 return (ret);
2237 }
2238
2239 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
2240 {
2241 return (X509_NAME_cmp(*a, *b));
2242 }
2243
2244 #ifndef OPENSSL_NO_TLSEXT
2245 int ssl3_get_new_session_ticket(SSL *s)
2246 {
2247 int ok, al, ret = 0, ticklen;
2248 long n;
2249 const unsigned char *p;
2250 unsigned char *d;
2251
2252 n = s->method->ssl_get_message(s,
2253 SSL3_ST_CR_SESSION_TICKET_A,
2254 SSL3_ST_CR_SESSION_TICKET_B,
2255 SSL3_MT_NEWSESSION_TICKET, 16384, &ok);
2256
2257 if (!ok)
2258 return ((int)n);
2259
2260 if (n < 6) {
2261 /* need at least ticket_lifetime_hint + ticket length */
2262 al = SSL_AD_DECODE_ERROR;
2263 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2264 goto f_err;
2265 }
2266
2267 p = d = (unsigned char *)s->init_msg;
2268 n2l(p, s->session->tlsext_tick_lifetime_hint);
2269 n2s(p, ticklen);
2270 /* ticket_lifetime_hint + ticket_length + ticket */
2271 if (ticklen + 6 != n) {
2272 al = SSL_AD_DECODE_ERROR;
2273 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2274 goto f_err;
2275 }
2276 OPENSSL_free(s->session->tlsext_tick);
2277 s->session->tlsext_ticklen = 0;
2278 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2279 if (!s->session->tlsext_tick) {
2280 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2281 goto err;
2282 }
2283 memcpy(s->session->tlsext_tick, p, ticklen);
2284 s->session->tlsext_ticklen = ticklen;
2285 /*
2286 * There are two ways to detect a resumed ticket session. One is to set
2287 * an appropriate session ID and then the server must return a match in
2288 * ServerHello. This allows the normal client session ID matching to work
2289 * and we know much earlier that the ticket has been accepted. The
2290 * other way is to set zero length session ID when the ticket is
2291 * presented and rely on the handshake to determine session resumption.
2292 * We choose the former approach because this fits in with assumptions
2293 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
2294 * SHA256 is disabled) hash of the ticket.
2295 */
2296 EVP_Digest(p, ticklen,
2297 s->session->session_id, &s->session->session_id_length,
2298 EVP_sha256(), NULL);
2299 ret = 1;
2300 return (ret);
2301 f_err:
2302 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2303 err:
2304 s->state = SSL_ST_ERR;
2305 return (-1);
2306 }
2307
2308 int ssl3_get_cert_status(SSL *s)
2309 {
2310 int ok, al;
2311 unsigned long resplen, n;
2312 const unsigned char *p;
2313
2314 n = s->method->ssl_get_message(s,
2315 SSL3_ST_CR_CERT_STATUS_A,
2316 SSL3_ST_CR_CERT_STATUS_B,
2317 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
2318
2319 if (!ok)
2320 return ((int)n);
2321 if (n < 4) {
2322 /* need at least status type + length */
2323 al = SSL_AD_DECODE_ERROR;
2324 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2325 goto f_err;
2326 }
2327 p = (unsigned char *)s->init_msg;
2328 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
2329 al = SSL_AD_DECODE_ERROR;
2330 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
2331 goto f_err;
2332 }
2333 n2l3(p, resplen);
2334 if (resplen + 4 != n) {
2335 al = SSL_AD_DECODE_ERROR;
2336 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2337 goto f_err;
2338 }
2339 OPENSSL_free(s->tlsext_ocsp_resp);
2340 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2341 if (!s->tlsext_ocsp_resp) {
2342 al = SSL_AD_INTERNAL_ERROR;
2343 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2344 goto f_err;
2345 }
2346 s->tlsext_ocsp_resplen = resplen;
2347 if (s->ctx->tlsext_status_cb) {
2348 int ret;
2349 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2350 if (ret == 0) {
2351 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2352 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
2353 goto f_err;
2354 }
2355 if (ret < 0) {
2356 al = SSL_AD_INTERNAL_ERROR;
2357 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2358 goto f_err;
2359 }
2360 }
2361 return 1;
2362 f_err:
2363 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2364 s->state = SSL_ST_ERR;
2365 return (-1);
2366 }
2367 #endif
2368
2369 int ssl3_get_server_done(SSL *s)
2370 {
2371 int ok, ret = 0;
2372 long n;
2373
2374 /* Second to last param should be very small, like 0 :-) */
2375 n = s->method->ssl_get_message(s,
2376 SSL3_ST_CR_SRVR_DONE_A,
2377 SSL3_ST_CR_SRVR_DONE_B,
2378 SSL3_MT_SERVER_DONE, 30, &ok);
2379
2380 if (!ok)
2381 return ((int)n);
2382 if (n > 0) {
2383 /* should contain no data */
2384 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2385 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
2386 s->state = SSL_ST_ERR;
2387 return -1;
2388 }
2389 ret = 1;
2390 return (ret);
2391 }
2392
2393 int ssl3_send_client_key_exchange(SSL *s)
2394 {
2395 unsigned char *p;
2396 int n;
2397 unsigned long alg_k;
2398 #ifndef OPENSSL_NO_RSA
2399 unsigned char *q;
2400 EVP_PKEY *pkey = NULL;
2401 #endif
2402 #ifndef OPENSSL_NO_EC
2403 EC_KEY *clnt_ecdh = NULL;
2404 const EC_POINT *srvr_ecpoint = NULL;
2405 EVP_PKEY *srvr_pub_pkey = NULL;
2406 unsigned char *encodedPoint = NULL;
2407 int encoded_pt_len = 0;
2408 BN_CTX *bn_ctx = NULL;
2409 #endif
2410 unsigned char *pms = NULL;
2411 size_t pmslen = 0;
2412
2413 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
2414 p = ssl_handshake_start(s);
2415
2416 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2417
2418 /* Fool emacs indentation */
2419 if (0) {
2420 }
2421 #ifndef OPENSSL_NO_RSA
2422 else if (alg_k & SSL_kRSA) {
2423 RSA *rsa;
2424 pmslen = SSL_MAX_MASTER_KEY_LENGTH;
2425 pms = OPENSSL_malloc(pmslen);
2426 if (!pms)
2427 goto memerr;
2428
2429 if (s->session->sess_cert == NULL) {
2430 /*
2431 * We should always have a server certificate with SSL_kRSA.
2432 */
2433 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2434 ERR_R_INTERNAL_ERROR);
2435 goto err;
2436 }
2437
2438 if (s->session->sess_cert->peer_rsa_tmp != NULL)
2439 rsa = s->session->sess_cert->peer_rsa_tmp;
2440 else {
2441 pkey =
2442 X509_get_pubkey(s->session->
2443 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
2444 x509);
2445 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
2446 || (pkey->pkey.rsa == NULL)) {
2447 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2448 ERR_R_INTERNAL_ERROR);
2449 goto err;
2450 }
2451 rsa = pkey->pkey.rsa;
2452 EVP_PKEY_free(pkey);
2453 }
2454
2455 pms[0] = s->client_version >> 8;
2456 pms[1] = s->client_version & 0xff;
2457 if (RAND_bytes(pms + 2, pmslen - 2) <= 0)
2458 goto err;
2459
2460 q = p;
2461 /* Fix buf for TLS and beyond */
2462 if (s->version > SSL3_VERSION)
2463 p += 2;
2464 n = RSA_public_encrypt(pmslen, pms, p, rsa, RSA_PKCS1_PADDING);
2465 # ifdef PKCS1_CHECK
2466 if (s->options & SSL_OP_PKCS1_CHECK_1)
2467 p[1]++;
2468 if (s->options & SSL_OP_PKCS1_CHECK_2)
2469 tmp_buf[0] = 0x70;
2470 # endif
2471 if (n <= 0) {
2472 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2473 SSL_R_BAD_RSA_ENCRYPT);
2474 goto err;
2475 }
2476
2477 /* Fix buf for TLS and beyond */
2478 if (s->version > SSL3_VERSION) {
2479 s2n(n, q);
2480 n += 2;
2481 }
2482 }
2483 #endif
2484 #ifndef OPENSSL_NO_DH
2485 else if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
2486 DH *dh_srvr, *dh_clnt;
2487 SESS_CERT *scert = s->session->sess_cert;
2488
2489 if (scert == NULL) {
2490 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2491 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2492 SSL_R_UNEXPECTED_MESSAGE);
2493 goto err;
2494 }
2495
2496 if (scert->peer_dh_tmp != NULL)
2497 dh_srvr = scert->peer_dh_tmp;
2498 else {
2499 /* we get them from the cert */
2500 int idx = scert->peer_cert_type;
2501 EVP_PKEY *spkey = NULL;
2502 dh_srvr = NULL;
2503 if (idx >= 0)
2504 spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509);
2505 if (spkey) {
2506 dh_srvr = EVP_PKEY_get1_DH(spkey);
2507 EVP_PKEY_free(spkey);
2508 }
2509 if (dh_srvr == NULL) {
2510 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2511 ERR_R_INTERNAL_ERROR);
2512 goto err;
2513 }
2514 }
2515 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
2516 /* Use client certificate key */
2517 EVP_PKEY *clkey = s->cert->key->privatekey;
2518 dh_clnt = NULL;
2519 if (clkey)
2520 dh_clnt = EVP_PKEY_get1_DH(clkey);
2521 if (dh_clnt == NULL) {
2522 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2523 ERR_R_INTERNAL_ERROR);
2524 goto err;
2525 }
2526 } else {
2527 /* generate a new random key */
2528 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2529 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2530 goto err;
2531 }
2532 if (!DH_generate_key(dh_clnt)) {
2533 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2534 DH_free(dh_clnt);
2535 goto err;
2536 }
2537 }
2538
2539 pmslen = DH_size(dh_clnt);
2540 pms = OPENSSL_malloc(pmslen);
2541 if (!pms)
2542 goto memerr;
2543
2544 /*
2545 * use the 'p' output buffer for the DH key, but make sure to
2546 * clear it out afterwards
2547 */
2548
2549 n = DH_compute_key(pms, dh_srvr->pub_key, dh_clnt);
2550 if (scert->peer_dh_tmp == NULL)
2551 DH_free(dh_srvr);
2552
2553 if (n <= 0) {
2554 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2555 DH_free(dh_clnt);
2556 goto err;
2557 }
2558 pmslen = n;
2559
2560 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2561 n = 0;
2562 else {
2563 /* send off the data */
2564 n = BN_num_bytes(dh_clnt->pub_key);
2565 s2n(n, p);
2566 BN_bn2bin(dh_clnt->pub_key, p);
2567 n += 2;
2568 }
2569
2570 DH_free(dh_clnt);
2571
2572 /* perhaps clean things up a bit EAY EAY EAY EAY */
2573 }
2574 #endif
2575
2576 #ifndef OPENSSL_NO_EC
2577 else if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe)) {
2578 const EC_GROUP *srvr_group = NULL;
2579 EC_KEY *tkey;
2580 int ecdh_clnt_cert = 0;
2581 int field_size = 0;
2582
2583 if (s->session->sess_cert == NULL) {
2584 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2585 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2586 SSL_R_UNEXPECTED_MESSAGE);
2587 goto err;
2588 }
2589
2590 /*
2591 * Did we send out the client's ECDH share for use in premaster
2592 * computation as part of client certificate? If so, set
2593 * ecdh_clnt_cert to 1.
2594 */
2595 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
2596 /*-
2597 * XXX: For now, we do not support client
2598 * authentication using ECDH certificates.
2599 * To add such support, one needs to add
2600 * code that checks for appropriate
2601 * conditions and sets ecdh_clnt_cert to 1.
2602 * For example, the cert have an ECC
2603 * key on the same curve as the server's
2604 * and the key should be authorized for
2605 * key agreement.
2606 *
2607 * One also needs to add code in ssl3_connect
2608 * to skip sending the certificate verify
2609 * message.
2610 *
2611 * if ((s->cert->key->privatekey != NULL) &&
2612 * (s->cert->key->privatekey->type ==
2613 * EVP_PKEY_EC) && ...)
2614 * ecdh_clnt_cert = 1;
2615 */
2616 }
2617
2618 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2619 tkey = s->session->sess_cert->peer_ecdh_tmp;
2620 } else {
2621 /* Get the Server Public Key from Cert */
2622 srvr_pub_pkey =
2623 X509_get_pubkey(s->session->
2624 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2625 if ((srvr_pub_pkey == NULL)
2626 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2627 || (srvr_pub_pkey->pkey.ec == NULL)) {
2628 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2629 ERR_R_INTERNAL_ERROR);
2630 goto err;
2631 }
2632
2633 tkey = srvr_pub_pkey->pkey.ec;
2634 }
2635
2636 srvr_group = EC_KEY_get0_group(tkey);
2637 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2638
2639 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2640 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2641 ERR_R_INTERNAL_ERROR);
2642 goto err;
2643 }
2644
2645 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2646 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2647 ERR_R_MALLOC_FAILURE);
2648 goto err;
2649 }
2650
2651 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2652 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2653 goto err;
2654 }
2655 if (ecdh_clnt_cert) {
2656 /*
2657 * Reuse key info from our certificate We only need our
2658 * private key to perform the ECDH computation.
2659 */
2660 const BIGNUM *priv_key;
2661 tkey = s->cert->key->privatekey->pkey.ec;
2662 priv_key = EC_KEY_get0_private_key(tkey);
2663 if (priv_key == NULL) {
2664 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2665 ERR_R_MALLOC_FAILURE);
2666 goto err;
2667 }
2668 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2669 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2670 goto err;
2671 }
2672 } else {
2673 /* Generate a new ECDH key pair */
2674 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2675 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2676 ERR_R_ECDH_LIB);
2677 goto err;
2678 }
2679 }
2680
2681 /*
2682 * use the 'p' output buffer for the ECDH key, but make sure to
2683 * clear it out afterwards
2684 */
2685
2686 field_size = EC_GROUP_get_degree(srvr_group);
2687 if (field_size <= 0) {
2688 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2689 goto err;
2690 }
2691 pmslen = (field_size + 7) / 8;
2692 pms = OPENSSL_malloc(pmslen);
2693 if (!pms)
2694 goto memerr;
2695 n = ECDH_compute_key(pms, pmslen, srvr_ecpoint, clnt_ecdh, NULL);
2696 if (n <= 0 || pmslen != (size_t)n) {
2697 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2698 goto err;
2699 }
2700
2701 if (ecdh_clnt_cert) {
2702 /* Send empty client key exch message */
2703 n = 0;
2704 } else {
2705 /*
2706 * First check the size of encoding and allocate memory
2707 * accordingly.
2708 */
2709 encoded_pt_len =
2710 EC_POINT_point2oct(srvr_group,
2711 EC_KEY_get0_public_key(clnt_ecdh),
2712 POINT_CONVERSION_UNCOMPRESSED,
2713 NULL, 0, NULL);
2714
2715 encodedPoint = (unsigned char *)
2716 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2717 bn_ctx = BN_CTX_new();
2718 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2719 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2720 ERR_R_MALLOC_FAILURE);
2721 goto err;
2722 }
2723
2724 /* Encode the public key */
2725 n = EC_POINT_point2oct(srvr_group,
2726 EC_KEY_get0_public_key(clnt_ecdh),
2727 POINT_CONVERSION_UNCOMPRESSED,
2728 encodedPoint, encoded_pt_len, bn_ctx);
2729
2730 *p = n; /* length of encoded point */
2731 /* Encoded point will be copied here */
2732 p += 1;
2733 /* copy the point */
2734 memcpy(p, encodedPoint, n);
2735 /* increment n to account for length field */
2736 n += 1;
2737 }
2738
2739 /* Free allocated memory */
2740 BN_CTX_free(bn_ctx);
2741 OPENSSL_free(encodedPoint);
2742 EC_KEY_free(clnt_ecdh);
2743 EVP_PKEY_free(srvr_pub_pkey);
2744 }
2745 #endif /* !OPENSSL_NO_EC */
2746 else if (alg_k & SSL_kGOST) {
2747 /* GOST key exchange message creation */
2748 EVP_PKEY_CTX *pkey_ctx;
2749 X509 *peer_cert;
2750 size_t msglen;
2751 unsigned int md_len;
2752 int keytype;
2753 unsigned char shared_ukm[32], tmp[256];
2754 EVP_MD_CTX *ukm_hash;
2755 EVP_PKEY *pub_key;
2756
2757 pmslen = 32;
2758 pms = OPENSSL_malloc(pmslen);
2759 if (!pms)
2760 goto memerr;
2761
2762 /*
2763 * Get server sertificate PKEY and create ctx from it
2764 */
2765 peer_cert =
2766 s->session->
2767 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509;
2768 if (!peer_cert)
2769 peer_cert =
2770 s->session->
2771 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509;
2772 if (!peer_cert) {
2773 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2774 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2775 goto err;
2776 }
2777
2778 pkey_ctx = EVP_PKEY_CTX_new(pub_key =
2779 X509_get_pubkey(peer_cert), NULL);
2780 /*
2781 * If we have send a certificate, and certificate key
2782 *
2783 * * parameters match those of server certificate, use
2784 * certificate key for key exchange
2785 */
2786
2787 /* Otherwise, generate ephemeral key pair */
2788
2789 EVP_PKEY_encrypt_init(pkey_ctx);
2790 /* Generate session key */
2791 if (RAND_bytes(pms, pmslen) <= 0) {
2792 EVP_PKEY_CTX_free(pkey_ctx);
2793 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2794 ERR_R_INTERNAL_ERROR);
2795 goto err;
2796 };
2797 /*
2798 * If we have client certificate, use its secret as peer key
2799 */
2800 if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2801 if (EVP_PKEY_derive_set_peer
2802 (pkey_ctx, s->cert->key->privatekey) <= 0) {
2803 /*
2804 * If there was an error - just ignore it. Ephemeral key
2805 * * would be used
2806 */
2807 ERR_clear_error();
2808 }
2809 }
2810 /*
2811 * Compute shared IV and store it in algorithm-specific context
2812 * data
2813 */
2814 ukm_hash = EVP_MD_CTX_create();
2815 EVP_DigestInit(ukm_hash,
2816 EVP_get_digestbynid(NID_id_GostR3411_94));
2817 EVP_DigestUpdate(ukm_hash, s->s3->client_random,
2818 SSL3_RANDOM_SIZE);
2819 EVP_DigestUpdate(ukm_hash, s->s3->server_random,
2820 SSL3_RANDOM_SIZE);
2821 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2822 EVP_MD_CTX_destroy(ukm_hash);
2823 if (EVP_PKEY_CTX_ctrl
2824 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8,
2825 shared_ukm) < 0) {
2826 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2827 SSL_R_LIBRARY_BUG);
2828 goto err;
2829 }
2830 /* Make GOST keytransport blob message */
2831 /*
2832 * Encapsulate it into sequence
2833 */
2834 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2835 msglen = 255;
2836 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) < 0) {
2837 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2838 SSL_R_LIBRARY_BUG);
2839 goto err;
2840 }
2841 if (msglen >= 0x80) {
2842 *(p++) = 0x81;
2843 *(p++) = msglen & 0xff;
2844 n = msglen + 3;
2845 } else {
2846 *(p++) = msglen & 0xff;
2847 n = msglen + 2;
2848 }
2849 memcpy(p, tmp, msglen);
2850 /* Check if pubkey from client certificate was used */
2851 if (EVP_PKEY_CTX_ctrl
2852 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) {
2853 /* Set flag "skip certificate verify" */
2854 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2855 }
2856 EVP_PKEY_CTX_free(pkey_ctx);
2857 EVP_PKEY_free(pub_key);
2858
2859 }
2860 #ifndef OPENSSL_NO_SRP
2861 else if (alg_k & SSL_kSRP) {
2862 if (s->srp_ctx.A != NULL) {
2863 /* send off the data */
2864 n = BN_num_bytes(s->srp_ctx.A);
2865 s2n(n, p);
2866 BN_bn2bin(s->srp_ctx.A, p);
2867 n += 2;
2868 } else {
2869 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2870 ERR_R_INTERNAL_ERROR);
2871 goto err;
2872 }
2873 OPENSSL_free(s->session->srp_username);
2874 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2875 if (s->session->srp_username == NULL) {
2876 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2877 ERR_R_MALLOC_FAILURE);
2878 goto err;
2879 }
2880 }
2881 #endif
2882 #ifndef OPENSSL_NO_PSK
2883 else if (alg_k & SSL_kPSK) {
2884 /*
2885 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
2886 * \0-terminated identity. The last byte is for us for simulating
2887 * strnlen.
2888 */
2889 char identity[PSK_MAX_IDENTITY_LEN + 2];
2890 size_t identity_len;
2891 unsigned char *t = NULL;
2892 unsigned int psk_len = 0;
2893 int psk_err = 1;
2894
2895 n = 0;
2896 if (s->psk_client_callback == NULL) {
2897 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2898 SSL_R_PSK_NO_CLIENT_CB);
2899 goto err;
2900 }
2901
2902 memset(identity, 0, sizeof(identity));
2903 /* Allocate maximum size buffer */
2904 pmslen = PSK_MAX_PSK_LEN * 2 + 4;
2905 pms = OPENSSL_malloc(pmslen);
2906 if (!pms)
2907 goto memerr;
2908
2909 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2910 identity, sizeof(identity) - 1,
2911 pms, pmslen);
2912 if (psk_len > PSK_MAX_PSK_LEN) {
2913 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2914 ERR_R_INTERNAL_ERROR);
2915 goto psk_err;
2916 } else if (psk_len == 0) {
2917 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2918 SSL_R_PSK_IDENTITY_NOT_FOUND);
2919 goto psk_err;
2920 }
2921 /* Change pmslen to real length */
2922 pmslen = 2 + psk_len + 2 + psk_len;
2923 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
2924 identity_len = strlen(identity);
2925 if (identity_len > PSK_MAX_IDENTITY_LEN) {
2926 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2927 ERR_R_INTERNAL_ERROR);
2928 goto psk_err;
2929 }
2930 /* create PSK pre_master_secret */
2931 t = pms;
2932 memmove(pms + psk_len + 4, pms, psk_len);
2933 s2n(psk_len, t);
2934 memset(t, 0, psk_len);
2935 t += psk_len;
2936 s2n(psk_len, t);
2937
2938 OPENSSL_free(s->session->psk_identity_hint);
2939 s->session->psk_identity_hint =
2940 BUF_strdup(s->ctx->psk_identity_hint);
2941 if (s->ctx->psk_identity_hint != NULL
2942 && s->session->psk_identity_hint == NULL) {
2943 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2944 ERR_R_MALLOC_FAILURE);
2945 goto psk_err;
2946 }
2947
2948 OPENSSL_free(s->session->psk_identity);
2949 s->session->psk_identity = BUF_strdup(identity);
2950 if (s->session->psk_identity == NULL) {
2951 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2952 ERR_R_MALLOC_FAILURE);
2953 goto psk_err;
2954 }
2955
2956 s2n(identity_len, p);
2957 memcpy(p, identity, identity_len);
2958 n = 2 + identity_len;
2959 psk_err = 0;
2960 psk_err:
2961 OPENSSL_cleanse(identity, sizeof(identity));
2962 if (psk_err != 0) {
2963 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2964 goto err;
2965 }
2966 }
2967 #endif
2968 else {
2969 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2970 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2971 goto err;
2972 }
2973
2974 if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n)) {
2975 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2976 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2977 goto err;
2978 }
2979
2980 s->state = SSL3_ST_CW_KEY_EXCH_B;
2981 }
2982
2983 /* SSL3_ST_CW_KEY_EXCH_B */
2984 n = ssl_do_write(s);
2985 #ifndef OPENSSL_NO_SRP
2986 /* Check for SRP */
2987 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
2988 /*
2989 * If everything written generate master key: no need to save PMS as
2990 * SRP_generate_client_master_secret generates it internally.
2991 */
2992 if (n > 0) {
2993 if ((s->session->master_key_length =
2994 SRP_generate_client_master_secret(s,
2995 s->session->master_key)) <
2996 0) {
2997 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2998 ERR_R_INTERNAL_ERROR);
2999 goto err;
3000 }
3001 }
3002 } else
3003 #endif
3004 /* If we haven't written everything save PMS */
3005 if (n <= 0) {
3006 s->cert->pms = pms;
3007 s->cert->pmslen = pmslen;
3008 } else {
3009 /* If we don't have a PMS restore */
3010 if (pms == NULL) {
3011 pms = s->cert->pms;
3012 pmslen = s->cert->pmslen;
3013 }
3014 if (pms == NULL) {
3015 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3016 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
3017 goto err;
3018 }
3019 s->session->master_key_length =
3020 s->method->ssl3_enc->generate_master_secret(s,
3021 s->
3022 session->master_key,
3023 pms, pmslen);
3024 OPENSSL_clear_free(pms, pmslen);
3025 s->cert->pms = NULL;
3026 if (s->session->master_key_length < 0) {
3027 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3028 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3029 goto err;
3030 }
3031 }
3032 return n;
3033 memerr:
3034 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3035 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
3036 err:
3037 OPENSSL_clear_free(pms, pmslen);
3038 s->cert->pms = NULL;
3039 #ifndef OPENSSL_NO_EC
3040 BN_CTX_free(bn_ctx);
3041 OPENSSL_free(encodedPoint);
3042 EC_KEY_free(clnt_ecdh);
3043 EVP_PKEY_free(srvr_pub_pkey);
3044 #endif
3045 s->state = SSL_ST_ERR;
3046 return (-1);
3047 }
3048
3049 int ssl3_send_client_verify(SSL *s)
3050 {
3051 unsigned char *p;
3052 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
3053 EVP_PKEY *pkey;
3054 EVP_PKEY_CTX *pctx = NULL;
3055 EVP_MD_CTX mctx;
3056 unsigned u = 0;
3057 unsigned long n;
3058 int j;
3059
3060 EVP_MD_CTX_init(&mctx);
3061
3062 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
3063 p = ssl_handshake_start(s);
3064 pkey = s->cert->key->privatekey;
3065 /* Create context from key and test if sha1 is allowed as digest */
3066 pctx = EVP_PKEY_CTX_new(pkey, NULL);
3067 EVP_PKEY_sign_init(pctx);
3068 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
3069 if (!SSL_USE_SIGALGS(s))
3070 s->method->ssl3_enc->cert_verify_mac(s,
3071 NID_sha1,
3072 &(data
3073 [MD5_DIGEST_LENGTH]));
3074 } else {
3075 ERR_clear_error();
3076 }
3077 /*
3078 * For TLS v1.2 send signature algorithm and signature using agreed
3079 * digest and cached handshake records.
3080 */
3081 if (SSL_USE_SIGALGS(s)) {
3082 long hdatalen = 0;
3083 void *hdata;
3084 const EVP_MD *md = s->cert->key->digest;
3085 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3086 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) {
3087 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3088 goto err;
3089 }
3090 p += 2;
3091 #ifdef SSL_DEBUG
3092 fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3093 EVP_MD_name(md));
3094 #endif
3095 if (!EVP_SignInit_ex(&mctx, md, NULL)
3096 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3097 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
3098 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB);
3099 goto err;
3100 }
3101 s2n(u, p);
3102 n = u + 4;
3103 /*
3104 * For extended master secret we've already digested cached
3105 * records.
3106 */
3107 if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
3108 BIO_free(s->s3->handshake_buffer);
3109 s->s3->handshake_buffer = NULL;
3110 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3111 } else if (!ssl3_digest_cached_records(s))
3112 goto err;
3113 } else
3114 #ifndef OPENSSL_NO_RSA
3115 if (pkey->type == EVP_PKEY_RSA) {
3116 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
3117 if (RSA_sign(NID_md5_sha1, data,
3118 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
3119 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
3120 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
3121 goto err;
3122 }
3123 s2n(u, p);
3124 n = u + 2;
3125 } else
3126 #endif
3127 #ifndef OPENSSL_NO_DSA
3128 if (pkey->type == EVP_PKEY_DSA) {
3129 if (!DSA_sign(pkey->save_type,
3130 &(data[MD5_DIGEST_LENGTH]),
3131 SHA_DIGEST_LENGTH, &(p[2]),
3132 (unsigned int *)&j, pkey->pkey.dsa)) {
3133 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
3134 goto err;
3135 }
3136 s2n(j, p);
3137 n = j + 2;
3138 } else
3139 #endif
3140 #ifndef OPENSSL_NO_EC
3141 if (pkey->type == EVP_PKEY_EC) {
3142 if (!ECDSA_sign(pkey->save_type,
3143 &(data[MD5_DIGEST_LENGTH]),
3144 SHA_DIGEST_LENGTH, &(p[2]),
3145 (unsigned int *)&j, pkey->pkey.ec)) {
3146 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
3147 goto err;
3148 }
3149 s2n(j, p);
3150 n = j + 2;
3151 } else
3152 #endif
3153 if (pkey->type == NID_id_GostR3410_94
3154 || pkey->type == NID_id_GostR3410_2001) {
3155 unsigned char signbuf[64];
3156 int i;
3157 size_t sigsize = 64;
3158 s->method->ssl3_enc->cert_verify_mac(s,
3159 NID_id_GostR3411_94, data);
3160 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3161 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3162 goto err;
3163 }
3164 for (i = 63, j = 0; i >= 0; j++, i--) {
3165 p[2 + j] = signbuf[i];
3166 }
3167 s2n(j, p);
3168 n = j + 2;
3169 } else {
3170 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3171 goto err;
3172 }
3173 if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n)) {
3174 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3175 goto err;
3176 }
3177 s->state = SSL3_ST_CW_CERT_VRFY_B;
3178 }
3179 EVP_MD_CTX_cleanup(&mctx);
3180 EVP_PKEY_CTX_free(pctx);
3181 return ssl_do_write(s);
3182 err:
3183 EVP_MD_CTX_cleanup(&mctx);
3184 EVP_PKEY_CTX_free(pctx);
3185 s->state = SSL_ST_ERR;
3186 return (-1);
3187 }
3188
3189 /*
3190 * Check a certificate can be used for client authentication. Currently check
3191 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
3192 * certificates can be used and optionally checks suitability for Suite B.
3193 */
3194 static int ssl3_check_client_certificate(SSL *s)
3195 {
3196 unsigned long alg_k;
3197 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3198 return 0;
3199 /* If no suitable signature algorithm can't use certificate */
3200 if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3201 return 0;
3202 /*
3203 * If strict mode check suitability of chain before using it. This also
3204 * adjusts suite B digest if necessary.
3205 */
3206 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3207 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3208 return 0;
3209 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3210 /* See if we can use client certificate for fixed DH */
3211 if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3212 SESS_CERT *scert = s->session->sess_cert;
3213 int i = scert->peer_cert_type;
3214 EVP_PKEY *clkey = NULL, *spkey = NULL;
3215 clkey = s->cert->key->privatekey;
3216 /* If client key not DH assume it can be used */
3217 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3218 return 1;
3219 if (i >= 0)
3220 spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3221 if (spkey) {
3222 /* Compare server and client parameters */
3223 i = EVP_PKEY_cmp_parameters(clkey, spkey);
3224 EVP_PKEY_free(spkey);
3225 if (i != 1)
3226 return 0;
3227 }
3228 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3229 }
3230 return 1;
3231 }
3232
3233 int ssl3_send_client_certificate(SSL *s)
3234 {
3235 X509 *x509 = NULL;
3236 EVP_PKEY *pkey = NULL;
3237 int i;
3238
3239 if (s->state == SSL3_ST_CW_CERT_A) {
3240 /* Let cert callback update client certificates if required */
3241 if (s->cert->cert_cb) {
3242 i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3243 if (i < 0) {
3244 s->rwstate = SSL_X509_LOOKUP;
3245 return -1;
3246 }
3247 if (i == 0) {
3248 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3249 s->state = SSL_ST_ERR;
3250 return 0;
3251 }
3252 s->rwstate = SSL_NOTHING;
3253 }
3254 if (ssl3_check_client_certificate(s))
3255 s->state = SSL3_ST_CW_CERT_C;
3256 else
3257 s->state = SSL3_ST_CW_CERT_B;
3258 }
3259
3260 /* We need to get a client cert */
3261 if (s->state == SSL3_ST_CW_CERT_B) {
3262 /*
3263 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3264 * return(-1); We then get retied later
3265 */
3266 i = 0;
3267 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3268 if (i < 0) {
3269 s->rwstate = SSL_X509_LOOKUP;
3270 return (-1);
3271 }
3272 s->rwstate = SSL_NOTHING;
3273 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3274 s->state = SSL3_ST_CW_CERT_B;
3275 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3276 i = 0;
3277 } else if (i == 1) {
3278 i = 0;
3279 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
3280 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3281 }
3282
3283 X509_free(x509);
3284 EVP_PKEY_free(pkey);
3285 if (i && !ssl3_check_client_certificate(s))
3286 i = 0;
3287 if (i == 0) {
3288 if (s->version == SSL3_VERSION) {
3289 s->s3->tmp.cert_req = 0;
3290 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3291 return (1);
3292 } else {
3293 s->s3->tmp.cert_req = 2;
3294 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s)) {
3295 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3296 s->state = SSL_ST_ERR;
3297 return 0;
3298 }
3299 }
3300 }
3301
3302 /* Ok, we have a cert */
3303 s->state = SSL3_ST_CW_CERT_C;
3304 }
3305
3306 if (s->state == SSL3_ST_CW_CERT_C) {
3307 s->state = SSL3_ST_CW_CERT_D;
3308 if (!ssl3_output_cert_chain(s,
3309 (s->s3->tmp.cert_req ==
3310 2) ? NULL : s->cert->key)) {
3311 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3312 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3313 s->state = SSL_ST_ERR;
3314 return 0;
3315 }
3316 }
3317 /* SSL3_ST_CW_CERT_D */
3318 return ssl_do_write(s);
3319 }
3320
3321 #define has_bits(i,m) (((i)&(m)) == (m))
3322
3323 int ssl3_check_cert_and_algorithm(SSL *s)
3324 {
3325 int i, idx;
3326 long alg_k, alg_a;
3327 EVP_PKEY *pkey = NULL;
3328 SESS_CERT *sc;
3329 #ifndef OPENSSL_NO_RSA
3330 RSA *rsa;
3331 #endif
3332 #ifndef OPENSSL_NO_DH
3333 DH *dh;
3334 #endif
3335
3336 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3337 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3338
3339 /* we don't have a certificate */
3340 if ((alg_a & SSL_aNULL) || (alg_k & SSL_kPSK))
3341 return (1);
3342
3343 sc = s->session->sess_cert;
3344 if (sc == NULL) {
3345 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3346 goto err;
3347 }
3348 #ifndef OPENSSL_NO_RSA
3349 rsa = s->session->sess_cert->peer_rsa_tmp;
3350 #endif
3351 #ifndef OPENSSL_NO_DH
3352 dh = s->session->sess_cert->peer_dh_tmp;
3353 #endif
3354
3355 /* This is the passed certificate */
3356
3357 idx = sc->peer_cert_type;
3358 #ifndef OPENSSL_NO_EC
3359 if (idx == SSL_PKEY_ECC) {
3360 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) {
3361 /* check failed */
3362 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
3363 goto f_err;
3364 } else {
3365 return 1;
3366 }
3367 } else if (alg_a & SSL_aECDSA) {
3368 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3369 SSL_R_MISSING_ECDSA_SIGNING_CERT);
3370 goto f_err;
3371 } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
3372 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT);
3373 goto f_err;
3374 }
3375 #endif
3376 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
3377 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
3378 EVP_PKEY_free(pkey);
3379
3380 /* Check that we have a certificate if we require one */
3381 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
3382 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3383 SSL_R_MISSING_RSA_SIGNING_CERT);
3384 goto f_err;
3385 }
3386 #ifndef OPENSSL_NO_DSA
3387 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
3388 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3389 SSL_R_MISSING_DSA_SIGNING_CERT);
3390 goto f_err;
3391 }
3392 #endif
3393 #ifndef OPENSSL_NO_RSA
3394 if ((alg_k & SSL_kRSA) &&
3395 !(has_bits(i, EVP_PK_RSA | EVP_PKT_ENC) || (rsa != NULL))) {
3396 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3397 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3398 goto f_err;
3399 }
3400 #endif
3401 #ifndef OPENSSL_NO_DH
3402 if ((alg_k & SSL_kDHE) &&
3403 !(has_bits(i, EVP_PK_DH | EVP_PKT_EXCH) || (dh != NULL))) {
3404 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_KEY);
3405 goto f_err;
3406 } else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3407 !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
3408 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3409 SSL_R_MISSING_DH_RSA_CERT);
3410 goto f_err;
3411 }
3412 # ifndef OPENSSL_NO_DSA
3413 else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3414 !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
3415 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3416 SSL_R_MISSING_DH_DSA_CERT);
3417 goto f_err;
3418 }
3419 # endif
3420 #endif
3421
3422 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i, EVP_PKT_EXP)) {
3423 #ifndef OPENSSL_NO_RSA
3424 if (alg_k & SSL_kRSA) {
3425 if (rsa == NULL
3426 || RSA_size(rsa) * 8 >
3427 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3428 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3429 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3430 goto f_err;
3431 }
3432 } else
3433 #endif
3434 #ifndef OPENSSL_NO_DH
3435 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
3436 if (dh == NULL
3437 || DH_size(dh) * 8 >
3438 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3439 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3440 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3441 goto f_err;
3442 }
3443 } else
3444 #endif
3445 {
3446 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3447 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3448 goto f_err;
3449 }
3450 }
3451 return (1);
3452 f_err:
3453 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3454 err:
3455 return (0);
3456 }
3457
3458 #ifndef OPENSSL_NO_TLSEXT
3459 /*
3460 * Normally, we can tell if the server is resuming the session from
3461 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server
3462 * message after the ServerHello to determine if the server is resuming.
3463 * Therefore, we allow EAP-FAST to peek ahead.
3464 * ssl3_check_finished returns 1 if we are resuming from an external
3465 * pre-shared secret, we have a "ticket" and the next server handshake message
3466 * is Finished; and 0 otherwise. It returns -1 upon an error.
3467 */
3468 static int ssl3_check_finished(SSL *s)
3469 {
3470 int ok = 0;
3471
3472 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb ||
3473 !s->session->tlsext_tick)
3474 return 0;
3475
3476 /* Need to permit this temporarily, in case the next message is Finished. */
3477 s->s3->flags |= SSL3_FLAGS_CCS_OK;
3478 /*
3479 * This function is called when we might get a Certificate message instead,
3480 * so permit appropriate message length.
3481 * We ignore the return value as we're only interested in the message type
3482 * and not its length.
3483 */
3484 s->method->ssl_get_message(s,
3485 SSL3_ST_CR_CERT_A,
3486 SSL3_ST_CR_CERT_B,
3487 -1, s->max_cert_list, &ok);
3488 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
3489
3490 if (!ok)
3491 return -1;
3492
3493 s->s3->tmp.reuse_message = 1;
3494
3495 if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
3496 return 1;
3497
3498 /* If we're not done, then the CCS arrived early and we should bail. */
3499 if (s->s3->change_cipher_spec) {
3500 SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY);
3501 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
3502 return -1;
3503 }
3504
3505 return 0;
3506 }
3507
3508 # ifndef OPENSSL_NO_NEXTPROTONEG
3509 int ssl3_send_next_proto(SSL *s)
3510 {
3511 unsigned int len, padding_len;
3512 unsigned char *d;
3513
3514 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) {
3515 len = s->next_proto_negotiated_len;
3516 padding_len = 32 - ((len + 2) % 32);
3517 d = (unsigned char *)s->init_buf->data;
3518 d[4] = len;
3519 memcpy(d + 5, s->next_proto_negotiated, len);
3520 d[5 + len] = padding_len;
3521 memset(d + 6 + len, 0, padding_len);
3522 *(d++) = SSL3_MT_NEXT_PROTO;
3523 l2n3(2 + len + padding_len, d);
3524 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3525 s->init_num = 4 + 2 + len + padding_len;
3526 s->init_off = 0;
3527 }
3528
3529 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3530 }
3531 # endif
3532 #endif
3533
3534 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3535 {
3536 int i = 0;
3537 #ifndef OPENSSL_NO_ENGINE
3538 if (s->ctx->client_cert_engine) {
3539 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3540 SSL_get_client_CA_list(s),
3541 px509, ppkey, NULL, NULL, NULL);
3542 if (i != 0)
3543 return i;
3544 }
3545 #endif
3546 if (s->ctx->client_cert_cb)
3547 i = s->ctx->client_cert_cb(s, px509, ppkey);
3548 return i;
3549 }
3550
3551 int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
3552 unsigned char *p,
3553 int (*put_cb) (const SSL_CIPHER *,
3554 unsigned char *))
3555 {
3556 int i, j = 0;
3557 SSL_CIPHER *c;
3558 unsigned char *q;
3559 int empty_reneg_info_scsv = !s->renegotiate;
3560 /* Set disabled masks for this session */
3561 ssl_set_client_disabled(s);
3562
3563 if (sk == NULL)
3564 return (0);
3565 q = p;
3566 if (put_cb == NULL)
3567 put_cb = s->method->put_cipher_by_char;
3568
3569 for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
3570 c = sk_SSL_CIPHER_value(sk, i);
3571 /* Skip disabled ciphers */
3572 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED))
3573 continue;
3574 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
3575 if (c->id == SSL3_CK_SCSV) {
3576 if (!empty_reneg_info_scsv)
3577 continue;
3578 else
3579 empty_reneg_info_scsv = 0;
3580 }
3581 #endif
3582 j = put_cb(c, p);
3583 p += j;
3584 }
3585 /*
3586 * If p == q, no ciphers; caller indicates an error. Otherwise, add
3587 * applicable SCSVs.
3588 */
3589 if (p != q) {
3590 if (empty_reneg_info_scsv) {
3591 static SSL_CIPHER scsv = {
3592 0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3593 };
3594 j = put_cb(&scsv, p);
3595 p += j;
3596 #ifdef OPENSSL_RI_DEBUG
3597 fprintf(stderr,
3598 "TLS_EMPTY_RENEGOTIATION_INFO_SCSV sent by client\n");
3599 #endif
3600 }
3601 if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
3602 static SSL_CIPHER scsv = {
3603 0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3604 };
3605 j = put_cb(&scsv, p);
3606 p += j;
3607 }
3608 }
3609
3610 return (p - q);
3611 }
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