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