1 /* $OpenBSD: ssl_clnt.c,v 1.73 2020/09/24 18:12:00 jsing Exp $ */
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 <limits.h>
152 #include <stdint.h>
153 #include <stdio.h>
154
155 #include "ssl_locl.h"
156
157 #include <openssl/bn.h>
158 #include <openssl/buffer.h>
159 #include <openssl/curve25519.h>
160 #include <openssl/dh.h>
161 #include <openssl/evp.h>
162 #include <openssl/md5.h>
163 #include <openssl/objects.h>
164
165 #ifndef OPENSSL_NO_ENGINE
166 #include <openssl/engine.h>
167 #endif
168 #ifndef OPENSSL_NO_GOST
169 #include <openssl/gost.h>
170 #endif
171
172 #include "bytestring.h"
173 #include "ssl_sigalgs.h"
174 #include "ssl_tlsext.h"
175
176 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b);
177
178 int
ssl3_connect(SSL * s)179 ssl3_connect(SSL *s)
180 {
181 void (*cb)(const SSL *ssl, int type, int val) = NULL;
182 int ret = -1;
183 int new_state, state, skip = 0;
184
185 ERR_clear_error();
186 errno = 0;
187
188 if (s->internal->info_callback != NULL)
189 cb = s->internal->info_callback;
190 else if (s->ctx->internal->info_callback != NULL)
191 cb = s->ctx->internal->info_callback;
192
193 s->internal->in_handshake++;
194 if (!SSL_in_init(s) || SSL_in_before(s))
195 SSL_clear(s);
196
197 for (;;) {
198 state = S3I(s)->hs.state;
199
200 switch (S3I(s)->hs.state) {
201 case SSL_ST_RENEGOTIATE:
202 s->internal->renegotiate = 1;
203 S3I(s)->hs.state = SSL_ST_CONNECT;
204 s->ctx->internal->stats.sess_connect_renegotiate++;
205 /* break */
206 case SSL_ST_BEFORE:
207 case SSL_ST_CONNECT:
208 case SSL_ST_BEFORE|SSL_ST_CONNECT:
209 case SSL_ST_OK|SSL_ST_CONNECT:
210
211 s->server = 0;
212 if (cb != NULL)
213 cb(s, SSL_CB_HANDSHAKE_START, 1);
214
215 if (SSL_IS_DTLS(s)) {
216 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
217 SSLerror(s, ERR_R_INTERNAL_ERROR);
218 ret = -1;
219 goto end;
220 }
221 } else {
222 if ((s->version & 0xff00) != 0x0300) {
223 SSLerror(s, ERR_R_INTERNAL_ERROR);
224 ret = -1;
225 goto end;
226 }
227 }
228
229 /* s->version=SSL3_VERSION; */
230 s->internal->type = SSL_ST_CONNECT;
231
232 if (!ssl3_setup_init_buffer(s)) {
233 ret = -1;
234 goto end;
235 }
236 if (!ssl3_setup_buffers(s)) {
237 ret = -1;
238 goto end;
239 }
240 if (!ssl_init_wbio_buffer(s, 0)) {
241 ret = -1;
242 goto end;
243 }
244
245 /* don't push the buffering BIO quite yet */
246
247 if (!tls1_transcript_init(s)) {
248 ret = -1;
249 goto end;
250 }
251
252 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A;
253 s->ctx->internal->stats.sess_connect++;
254 s->internal->init_num = 0;
255
256 if (SSL_IS_DTLS(s)) {
257 /* mark client_random uninitialized */
258 memset(s->s3->client_random, 0,
259 sizeof(s->s3->client_random));
260 D1I(s)->send_cookie = 0;
261 s->internal->hit = 0;
262 }
263 break;
264
265 case SSL3_ST_CW_CLNT_HELLO_A:
266 case SSL3_ST_CW_CLNT_HELLO_B:
267 s->internal->shutdown = 0;
268
269 if (SSL_IS_DTLS(s)) {
270 /* every DTLS ClientHello resets Finished MAC */
271 tls1_transcript_reset(s);
272
273 dtls1_start_timer(s);
274 }
275
276 ret = ssl3_send_client_hello(s);
277 if (ret <= 0)
278 goto end;
279
280 if (SSL_IS_DTLS(s) && D1I(s)->send_cookie) {
281 S3I(s)->hs.state = SSL3_ST_CW_FLUSH;
282 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A;
283 } else
284 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A;
285
286 s->internal->init_num = 0;
287
288 /* turn on buffering for the next lot of output */
289 if (s->bbio != s->wbio)
290 s->wbio = BIO_push(s->bbio, s->wbio);
291
292 break;
293
294 case SSL3_ST_CR_SRVR_HELLO_A:
295 case SSL3_ST_CR_SRVR_HELLO_B:
296 ret = ssl3_get_server_hello(s);
297 if (ret <= 0)
298 goto end;
299
300 if (s->internal->hit) {
301 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
302 if (!SSL_IS_DTLS(s)) {
303 if (s->internal->tlsext_ticket_expected) {
304 /* receive renewed session ticket */
305 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A;
306 }
307
308 /* No client certificate verification. */
309 tls1_transcript_free(s);
310 }
311 } else if (SSL_IS_DTLS(s)) {
312 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
313 } else {
314 S3I(s)->hs.state = SSL3_ST_CR_CERT_A;
315 }
316 s->internal->init_num = 0;
317 break;
318
319 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
320 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
321 ret = dtls1_get_hello_verify(s);
322 if (ret <= 0)
323 goto end;
324 dtls1_stop_timer(s);
325 if (D1I(s)->send_cookie) /* start again, with a cookie */
326 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A;
327 else
328 S3I(s)->hs.state = SSL3_ST_CR_CERT_A;
329 s->internal->init_num = 0;
330 break;
331
332 case SSL3_ST_CR_CERT_A:
333 case SSL3_ST_CR_CERT_B:
334 ret = ssl3_check_finished(s);
335 if (ret <= 0)
336 goto end;
337 if (ret == 2) {
338 s->internal->hit = 1;
339 if (s->internal->tlsext_ticket_expected)
340 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A;
341 else
342 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
343 s->internal->init_num = 0;
344 break;
345 }
346 /* Check if it is anon DH/ECDH. */
347 if (!(S3I(s)->hs.new_cipher->algorithm_auth &
348 SSL_aNULL)) {
349 ret = ssl3_get_server_certificate(s);
350 if (ret <= 0)
351 goto end;
352 if (s->internal->tlsext_status_expected)
353 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A;
354 else
355 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
356 } else {
357 skip = 1;
358 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
359 }
360 s->internal->init_num = 0;
361 break;
362
363 case SSL3_ST_CR_KEY_EXCH_A:
364 case SSL3_ST_CR_KEY_EXCH_B:
365 ret = ssl3_get_server_key_exchange(s);
366 if (ret <= 0)
367 goto end;
368 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A;
369 s->internal->init_num = 0;
370
371 /*
372 * At this point we check that we have the
373 * required stuff from the server.
374 */
375 if (!ssl3_check_cert_and_algorithm(s)) {
376 ret = -1;
377 goto end;
378 }
379 break;
380
381 case SSL3_ST_CR_CERT_REQ_A:
382 case SSL3_ST_CR_CERT_REQ_B:
383 ret = ssl3_get_certificate_request(s);
384 if (ret <= 0)
385 goto end;
386 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A;
387 s->internal->init_num = 0;
388 break;
389
390 case SSL3_ST_CR_SRVR_DONE_A:
391 case SSL3_ST_CR_SRVR_DONE_B:
392 ret = ssl3_get_server_done(s);
393 if (ret <= 0)
394 goto end;
395 if (SSL_IS_DTLS(s))
396 dtls1_stop_timer(s);
397 if (S3I(s)->tmp.cert_req)
398 S3I(s)->hs.state = SSL3_ST_CW_CERT_A;
399 else
400 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A;
401 s->internal->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 if (SSL_IS_DTLS(s))
410 dtls1_start_timer(s);
411 ret = ssl3_send_client_certificate(s);
412 if (ret <= 0)
413 goto end;
414 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A;
415 s->internal->init_num = 0;
416 break;
417
418 case SSL3_ST_CW_KEY_EXCH_A:
419 case SSL3_ST_CW_KEY_EXCH_B:
420 if (SSL_IS_DTLS(s))
421 dtls1_start_timer(s);
422 ret = ssl3_send_client_key_exchange(s);
423 if (ret <= 0)
424 goto end;
425 /*
426 * EAY EAY EAY need to check for DH fix cert
427 * sent back
428 */
429 /*
430 * For TLS, cert_req is set to 2, so a cert chain
431 * of nothing is sent, but no verify packet is sent
432 */
433 /*
434 * XXX: For now, we do not support client
435 * authentication in ECDH cipher suites with
436 * ECDH (rather than ECDSA) certificates.
437 * We need to skip the certificate verify
438 * message when client's ECDH public key is sent
439 * inside the client certificate.
440 */
441 if (S3I(s)->tmp.cert_req == 1) {
442 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A;
443 } else {
444 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
445 S3I(s)->change_cipher_spec = 0;
446 }
447 if (!SSL_IS_DTLS(s)) {
448 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
449 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
450 S3I(s)->change_cipher_spec = 0;
451 }
452 }
453
454 s->internal->init_num = 0;
455 break;
456
457 case SSL3_ST_CW_CERT_VRFY_A:
458 case SSL3_ST_CW_CERT_VRFY_B:
459 if (SSL_IS_DTLS(s))
460 dtls1_start_timer(s);
461 ret = ssl3_send_client_verify(s);
462 if (ret <= 0)
463 goto end;
464 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
465 s->internal->init_num = 0;
466 S3I(s)->change_cipher_spec = 0;
467 break;
468
469 case SSL3_ST_CW_CHANGE_A:
470 case SSL3_ST_CW_CHANGE_B:
471 if (SSL_IS_DTLS(s) && !s->internal->hit)
472 dtls1_start_timer(s);
473 ret = ssl3_send_change_cipher_spec(s,
474 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B);
475 if (ret <= 0)
476 goto end;
477
478 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A;
479 s->internal->init_num = 0;
480
481 s->session->cipher = S3I(s)->hs.new_cipher;
482 if (!tls1_setup_key_block(s)) {
483 ret = -1;
484 goto end;
485 }
486
487 if (!tls1_change_cipher_state(s,
488 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
489 ret = -1;
490 goto end;
491 }
492
493 if (SSL_IS_DTLS(s))
494 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
495
496 break;
497
498 case SSL3_ST_CW_FINISHED_A:
499 case SSL3_ST_CW_FINISHED_B:
500 if (SSL_IS_DTLS(s) && !s->internal->hit)
501 dtls1_start_timer(s);
502 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A,
503 SSL3_ST_CW_FINISHED_B, TLS_MD_CLIENT_FINISH_CONST,
504 TLS_MD_CLIENT_FINISH_CONST_SIZE);
505 if (ret <= 0)
506 goto end;
507 if (!SSL_IS_DTLS(s))
508 s->s3->flags |= SSL3_FLAGS_CCS_OK;
509 S3I(s)->hs.state = SSL3_ST_CW_FLUSH;
510
511 /* clear flags */
512 if (s->internal->hit) {
513 S3I(s)->hs.next_state = SSL_ST_OK;
514 } else {
515 /* Allow NewSessionTicket if ticket expected */
516 if (s->internal->tlsext_ticket_expected)
517 S3I(s)->hs.next_state =
518 SSL3_ST_CR_SESSION_TICKET_A;
519 else
520 S3I(s)->hs.next_state =
521 SSL3_ST_CR_FINISHED_A;
522 }
523 s->internal->init_num = 0;
524 break;
525
526 case SSL3_ST_CR_SESSION_TICKET_A:
527 case SSL3_ST_CR_SESSION_TICKET_B:
528 ret = ssl3_get_new_session_ticket(s);
529 if (ret <= 0)
530 goto end;
531 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
532 s->internal->init_num = 0;
533 break;
534
535 case SSL3_ST_CR_CERT_STATUS_A:
536 case SSL3_ST_CR_CERT_STATUS_B:
537 ret = ssl3_get_cert_status(s);
538 if (ret <= 0)
539 goto end;
540 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
541 s->internal->init_num = 0;
542 break;
543
544 case SSL3_ST_CR_FINISHED_A:
545 case SSL3_ST_CR_FINISHED_B:
546 if (SSL_IS_DTLS(s))
547 D1I(s)->change_cipher_spec_ok = 1;
548 else
549 s->s3->flags |= SSL3_FLAGS_CCS_OK;
550 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
551 SSL3_ST_CR_FINISHED_B);
552 if (ret <= 0)
553 goto end;
554 if (SSL_IS_DTLS(s))
555 dtls1_stop_timer(s);
556
557 if (s->internal->hit)
558 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
559 else
560 S3I(s)->hs.state = SSL_ST_OK;
561 s->internal->init_num = 0;
562 break;
563
564 case SSL3_ST_CW_FLUSH:
565 s->internal->rwstate = SSL_WRITING;
566 if (BIO_flush(s->wbio) <= 0) {
567 if (SSL_IS_DTLS(s)) {
568 /* If the write error was fatal, stop trying */
569 if (!BIO_should_retry(s->wbio)) {
570 s->internal->rwstate = SSL_NOTHING;
571 S3I(s)->hs.state = S3I(s)->hs.next_state;
572 }
573 }
574 ret = -1;
575 goto end;
576 }
577 s->internal->rwstate = SSL_NOTHING;
578 S3I(s)->hs.state = S3I(s)->hs.next_state;
579 break;
580
581 case SSL_ST_OK:
582 /* clean a few things up */
583 tls1_cleanup_key_block(s);
584
585 if (S3I(s)->handshake_transcript != NULL) {
586 SSLerror(s, ERR_R_INTERNAL_ERROR);
587 ret = -1;
588 goto end;
589 }
590
591 if (!SSL_IS_DTLS(s))
592 ssl3_release_init_buffer(s);
593
594 ssl_free_wbio_buffer(s);
595
596 s->internal->init_num = 0;
597 s->internal->renegotiate = 0;
598 s->internal->new_session = 0;
599
600 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
601 if (s->internal->hit)
602 s->ctx->internal->stats.sess_hit++;
603
604 ret = 1;
605 /* s->server=0; */
606 s->internal->handshake_func = ssl3_connect;
607 s->ctx->internal->stats.sess_connect_good++;
608
609 if (cb != NULL)
610 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
611
612 if (SSL_IS_DTLS(s)) {
613 /* done with handshaking */
614 D1I(s)->handshake_read_seq = 0;
615 D1I(s)->next_handshake_write_seq = 0;
616 }
617
618 goto end;
619 /* break; */
620
621 default:
622 SSLerror(s, SSL_R_UNKNOWN_STATE);
623 ret = -1;
624 goto end;
625 /* break; */
626 }
627
628 /* did we do anything */
629 if (!S3I(s)->tmp.reuse_message && !skip) {
630 if (s->internal->debug) {
631 if ((ret = BIO_flush(s->wbio)) <= 0)
632 goto end;
633 }
634
635 if ((cb != NULL) && (S3I(s)->hs.state != state)) {
636 new_state = S3I(s)->hs.state;
637 S3I(s)->hs.state = state;
638 cb(s, SSL_CB_CONNECT_LOOP, 1);
639 S3I(s)->hs.state = new_state;
640 }
641 }
642 skip = 0;
643 }
644
645 end:
646 s->internal->in_handshake--;
647 if (cb != NULL)
648 cb(s, SSL_CB_CONNECT_EXIT, ret);
649
650 return (ret);
651 }
652
653 int
ssl3_send_client_hello(SSL * s)654 ssl3_send_client_hello(SSL *s)
655 {
656 CBB cbb, client_hello, session_id, cookie, cipher_suites;
657 CBB compression_methods;
658 uint16_t max_version;
659 size_t sl;
660
661 memset(&cbb, 0, sizeof(cbb));
662
663 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) {
664 SSL_SESSION *sess = s->session;
665
666 if (ssl_supported_version_range(s, NULL, &max_version) != 1) {
667 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE);
668 return (-1);
669 }
670 s->client_version = s->version = max_version;
671
672 if (sess == NULL ||
673 sess->ssl_version != s->version ||
674 (!sess->session_id_length && !sess->tlsext_tick) ||
675 sess->internal->not_resumable) {
676 if (!ssl_get_new_session(s, 0))
677 goto err;
678 }
679 /* else use the pre-loaded session */
680
681 /*
682 * If a DTLS ClientHello message is being resent after a
683 * HelloVerifyRequest, we must retain the original client
684 * random value.
685 */
686 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0)
687 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE);
688
689 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello,
690 SSL3_MT_CLIENT_HELLO))
691 goto err;
692
693 /*
694 * Version indicates the negotiated version: for example from
695 * an SSLv2/v3 compatible client hello). The client_version
696 * field is the maximum version we permit and it is also
697 * used in RSA encrypted premaster secrets. Some servers can
698 * choke if we initially report a higher version then
699 * renegotiate to a lower one in the premaster secret. This
700 * didn't happen with TLS 1.0 as most servers supported it
701 * but it can with TLS 1.1 or later if the server only supports
702 * 1.0.
703 *
704 * Possible scenario with previous logic:
705 * 1. Client hello indicates TLS 1.2
706 * 2. Server hello says TLS 1.0
707 * 3. RSA encrypted premaster secret uses 1.2.
708 * 4. Handhaked proceeds using TLS 1.0.
709 * 5. Server sends hello request to renegotiate.
710 * 6. Client hello indicates TLS v1.0 as we now
711 * know that is maximum server supports.
712 * 7. Server chokes on RSA encrypted premaster secret
713 * containing version 1.0.
714 *
715 * For interoperability it should be OK to always use the
716 * maximum version we support in client hello and then rely
717 * on the checking of version to ensure the servers isn't
718 * being inconsistent: for example initially negotiating with
719 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
720 * client_version in client hello and not resetting it to
721 * the negotiated version.
722 */
723 if (!CBB_add_u16(&client_hello, s->client_version))
724 goto err;
725
726 /* Random stuff */
727 if (!CBB_add_bytes(&client_hello, s->s3->client_random,
728 sizeof(s->s3->client_random)))
729 goto err;
730
731 /* Session ID */
732 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id))
733 goto err;
734 if (!s->internal->new_session &&
735 s->session->session_id_length > 0) {
736 sl = s->session->session_id_length;
737 if (sl > sizeof(s->session->session_id)) {
738 SSLerror(s, ERR_R_INTERNAL_ERROR);
739 goto err;
740 }
741 if (!CBB_add_bytes(&session_id,
742 s->session->session_id, sl))
743 goto err;
744 }
745
746 /* DTLS Cookie. */
747 if (SSL_IS_DTLS(s)) {
748 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) {
749 SSLerror(s, ERR_R_INTERNAL_ERROR);
750 goto err;
751 }
752 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie))
753 goto err;
754 if (!CBB_add_bytes(&cookie, D1I(s)->cookie,
755 D1I(s)->cookie_len))
756 goto err;
757 }
758
759 /* Ciphers supported */
760 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites))
761 return 0;
762 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s),
763 &cipher_suites)) {
764 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE);
765 goto err;
766 }
767
768 /* Add in compression methods (null) */
769 if (!CBB_add_u8_length_prefixed(&client_hello,
770 &compression_methods))
771 goto err;
772 if (!CBB_add_u8(&compression_methods, 0))
773 goto err;
774
775 /* TLS extensions */
776 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) {
777 SSLerror(s, ERR_R_INTERNAL_ERROR);
778 goto err;
779 }
780
781 if (!ssl3_handshake_msg_finish(s, &cbb))
782 goto err;
783
784 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B;
785 }
786
787 /* SSL3_ST_CW_CLNT_HELLO_B */
788 return (ssl3_handshake_write(s));
789
790 err:
791 CBB_cleanup(&cbb);
792
793 return (-1);
794 }
795
796 int
ssl3_get_server_hello(SSL * s)797 ssl3_get_server_hello(SSL *s)
798 {
799 CBS cbs, server_random, session_id;
800 uint16_t server_version, cipher_suite;
801 uint16_t min_version, max_version;
802 uint8_t compression_method;
803 const SSL_CIPHER *cipher;
804 const SSL_METHOD *method;
805 unsigned long alg_k;
806 size_t outlen;
807 int al, ok;
808 long n;
809
810 s->internal->first_packet = 1;
811 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A,
812 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok);
813 if (!ok)
814 return ((int)n);
815 s->internal->first_packet = 0;
816
817 if (n < 0)
818 goto truncated;
819
820 CBS_init(&cbs, s->internal->init_msg, n);
821
822 if (SSL_IS_DTLS(s)) {
823 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
824 if (D1I(s)->send_cookie == 0) {
825 S3I(s)->tmp.reuse_message = 1;
826 return (1);
827 } else {
828 /* Already sent a cookie. */
829 al = SSL_AD_UNEXPECTED_MESSAGE;
830 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
831 goto f_err;
832 }
833 }
834 }
835
836 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) {
837 al = SSL_AD_UNEXPECTED_MESSAGE;
838 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
839 goto f_err;
840 }
841
842 if (!CBS_get_u16(&cbs, &server_version))
843 goto truncated;
844
845 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) {
846 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE);
847 goto err;
848 }
849
850 if (server_version < min_version || server_version > max_version) {
851 SSLerror(s, SSL_R_WRONG_SSL_VERSION);
852 s->version = (s->version & 0xff00) | (server_version & 0xff);
853 al = SSL_AD_PROTOCOL_VERSION;
854 goto f_err;
855 }
856 s->version = server_version;
857
858 if ((method = ssl_get_client_method(server_version)) == NULL) {
859 SSLerror(s, ERR_R_INTERNAL_ERROR);
860 goto err;
861 }
862 s->method = method;
863
864 /* Server random. */
865 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE))
866 goto truncated;
867 if (!CBS_write_bytes(&server_random, s->s3->server_random,
868 sizeof(s->s3->server_random), NULL))
869 goto err;
870
871 if (!ssl_downgrade_max_version(s, &max_version))
872 goto err;
873 if (!SSL_IS_DTLS(s) && max_version >= TLS1_2_VERSION &&
874 s->version < max_version) {
875 /*
876 * RFC 8446 section 4.1.3. We must not downgrade if the server
877 * random value contains the TLS 1.2 or TLS 1.1 magical value.
878 */
879 if (!CBS_skip(&server_random,
880 CBS_len(&server_random) - sizeof(tls13_downgrade_12)))
881 goto err;
882 if (s->version == TLS1_2_VERSION &&
883 CBS_mem_equal(&server_random, tls13_downgrade_12,
884 sizeof(tls13_downgrade_12))) {
885 al = SSL_AD_ILLEGAL_PARAMETER;
886 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK);
887 goto f_err;
888 }
889 if (CBS_mem_equal(&server_random, tls13_downgrade_11,
890 sizeof(tls13_downgrade_11))) {
891 al = SSL_AD_ILLEGAL_PARAMETER;
892 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK);
893 goto f_err;
894 }
895 }
896
897 /* Session ID. */
898 if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
899 goto truncated;
900
901 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) {
902 al = SSL_AD_ILLEGAL_PARAMETER;
903 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG);
904 goto f_err;
905 }
906
907 /* Cipher suite. */
908 if (!CBS_get_u16(&cbs, &cipher_suite))
909 goto truncated;
910
911 /*
912 * Check if we want to resume the session based on external
913 * pre-shared secret.
914 */
915 if (s->internal->tls_session_secret_cb) {
916 SSL_CIPHER *pref_cipher = NULL;
917 s->session->master_key_length = sizeof(s->session->master_key);
918 if (s->internal->tls_session_secret_cb(s, s->session->master_key,
919 &s->session->master_key_length, NULL, &pref_cipher,
920 s->internal->tls_session_secret_cb_arg)) {
921 s->session->cipher = pref_cipher ? pref_cipher :
922 ssl3_get_cipher_by_value(cipher_suite);
923 s->s3->flags |= SSL3_FLAGS_CCS_OK;
924 }
925 }
926
927 if (s->session->session_id_length != 0 &&
928 CBS_mem_equal(&session_id, s->session->session_id,
929 s->session->session_id_length)) {
930 if (s->sid_ctx_length != s->session->sid_ctx_length ||
931 timingsafe_memcmp(s->session->sid_ctx,
932 s->sid_ctx, s->sid_ctx_length) != 0) {
933 /* actually a client application bug */
934 al = SSL_AD_ILLEGAL_PARAMETER;
935 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
936 goto f_err;
937 }
938 s->s3->flags |= SSL3_FLAGS_CCS_OK;
939 s->internal->hit = 1;
940 } else {
941 /* a miss or crap from the other end */
942
943 /* If we were trying for session-id reuse, make a new
944 * SSL_SESSION so we don't stuff up other people */
945 s->internal->hit = 0;
946 if (s->session->session_id_length > 0) {
947 if (!ssl_get_new_session(s, 0)) {
948 al = SSL_AD_INTERNAL_ERROR;
949 goto f_err;
950 }
951 }
952
953 /*
954 * XXX - improve the handling for the case where there is a
955 * zero length session identifier.
956 */
957 if (!CBS_write_bytes(&session_id, s->session->session_id,
958 sizeof(s->session->session_id), &outlen))
959 goto err;
960 s->session->session_id_length = outlen;
961
962 s->session->ssl_version = s->version;
963 }
964
965 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) {
966 al = SSL_AD_ILLEGAL_PARAMETER;
967 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED);
968 goto f_err;
969 }
970
971 /* TLS v1.2 only ciphersuites require v1.2 or later. */
972 if ((cipher->algorithm_ssl & SSL_TLSV1_2) &&
973 (TLS1_get_version(s) < TLS1_2_VERSION)) {
974 al = SSL_AD_ILLEGAL_PARAMETER;
975 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED);
976 goto f_err;
977 }
978
979 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) {
980 /* we did not say we would use this cipher */
981 al = SSL_AD_ILLEGAL_PARAMETER;
982 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED);
983 goto f_err;
984 }
985
986 /*
987 * Depending on the session caching (internal/external), the cipher
988 * and/or cipher_id values may not be set. Make sure that
989 * cipher_id is set and use it for comparison.
990 */
991 if (s->session->cipher)
992 s->session->cipher_id = s->session->cipher->id;
993 if (s->internal->hit && (s->session->cipher_id != cipher->id)) {
994 al = SSL_AD_ILLEGAL_PARAMETER;
995 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
996 goto f_err;
997 }
998 S3I(s)->hs.new_cipher = cipher;
999
1000 if (!tls1_transcript_hash_init(s))
1001 goto err;
1002
1003 /*
1004 * Don't digest cached records if no sigalgs: we may need them for
1005 * client authentication.
1006 */
1007 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
1008 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)))
1009 tls1_transcript_free(s);
1010
1011 if (!CBS_get_u8(&cbs, &compression_method))
1012 goto truncated;
1013
1014 if (compression_method != 0) {
1015 al = SSL_AD_ILLEGAL_PARAMETER;
1016 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1017 goto f_err;
1018 }
1019
1020 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) {
1021 SSLerror(s, SSL_R_PARSE_TLSEXT);
1022 goto f_err;
1023 }
1024
1025 /*
1026 * Determine if we need to see RI. Strictly speaking if we want to
1027 * avoid an attack we should *always* see RI even on initial server
1028 * hello because the client doesn't see any renegotiation during an
1029 * attack. However this would mean we could not connect to any server
1030 * which doesn't support RI so for the immediate future tolerate RI
1031 * absence on initial connect only.
1032 */
1033 if (!S3I(s)->renegotiate_seen &&
1034 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) {
1035 al = SSL_AD_HANDSHAKE_FAILURE;
1036 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1037 goto f_err;
1038 }
1039
1040 if (ssl_check_serverhello_tlsext(s) <= 0) {
1041 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT);
1042 goto err;
1043 }
1044
1045 return (1);
1046
1047 truncated:
1048 /* wrong packet length */
1049 al = SSL_AD_DECODE_ERROR;
1050 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1051 f_err:
1052 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1053 err:
1054 return (-1);
1055 }
1056
1057 int
ssl3_get_server_certificate(SSL * s)1058 ssl3_get_server_certificate(SSL *s)
1059 {
1060 int al, i, ok, ret = -1;
1061 long n;
1062 CBS cbs, cert_list;
1063 X509 *x = NULL;
1064 const unsigned char *q;
1065 STACK_OF(X509) *sk = NULL;
1066 SESS_CERT *sc;
1067 EVP_PKEY *pkey = NULL;
1068
1069 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A,
1070 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok);
1071 if (!ok)
1072 return ((int)n);
1073
1074 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) {
1075 S3I(s)->tmp.reuse_message = 1;
1076 return (1);
1077 }
1078
1079 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) {
1080 al = SSL_AD_UNEXPECTED_MESSAGE;
1081 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
1082 goto f_err;
1083 }
1084
1085
1086 if ((sk = sk_X509_new_null()) == NULL) {
1087 SSLerror(s, ERR_R_MALLOC_FAILURE);
1088 goto err;
1089 }
1090
1091 if (n < 0)
1092 goto truncated;
1093
1094 CBS_init(&cbs, s->internal->init_msg, n);
1095 if (CBS_len(&cbs) < 3)
1096 goto truncated;
1097
1098 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) ||
1099 CBS_len(&cbs) != 0) {
1100 al = SSL_AD_DECODE_ERROR;
1101 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1102 goto f_err;
1103 }
1104
1105 while (CBS_len(&cert_list) > 0) {
1106 CBS cert;
1107
1108 if (CBS_len(&cert_list) < 3)
1109 goto truncated;
1110 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) {
1111 al = SSL_AD_DECODE_ERROR;
1112 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
1113 goto f_err;
1114 }
1115
1116 q = CBS_data(&cert);
1117 x = d2i_X509(NULL, &q, CBS_len(&cert));
1118 if (x == NULL) {
1119 al = SSL_AD_BAD_CERTIFICATE;
1120 SSLerror(s, ERR_R_ASN1_LIB);
1121 goto f_err;
1122 }
1123 if (q != CBS_data(&cert) + CBS_len(&cert)) {
1124 al = SSL_AD_DECODE_ERROR;
1125 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
1126 goto f_err;
1127 }
1128 if (!sk_X509_push(sk, x)) {
1129 SSLerror(s, ERR_R_MALLOC_FAILURE);
1130 goto err;
1131 }
1132 x = NULL;
1133 }
1134
1135 i = ssl_verify_cert_chain(s, sk);
1136 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) {
1137 al = ssl_verify_alarm_type(s->verify_result);
1138 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED);
1139 goto f_err;
1140
1141 }
1142 ERR_clear_error(); /* but we keep s->verify_result */
1143
1144 sc = ssl_sess_cert_new();
1145 if (sc == NULL)
1146 goto err;
1147 ssl_sess_cert_free(SSI(s)->sess_cert);
1148 SSI(s)->sess_cert = sc;
1149
1150 sc->cert_chain = sk;
1151 /*
1152 * Inconsistency alert: cert_chain does include the peer's
1153 * certificate, which we don't include in s3_srvr.c
1154 */
1155 x = sk_X509_value(sk, 0);
1156 sk = NULL;
1157 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1158
1159 pkey = X509_get_pubkey(x);
1160
1161 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
1162 x = NULL;
1163 al = SSL3_AL_FATAL;
1164 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1165 goto f_err;
1166 }
1167
1168 i = ssl_cert_type(x, pkey);
1169 if (i < 0) {
1170 x = NULL;
1171 al = SSL3_AL_FATAL;
1172 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1173 goto f_err;
1174 }
1175
1176 sc->peer_cert_type = i;
1177 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1178 /*
1179 * Why would the following ever happen?
1180 * We just created sc a couple of lines ago.
1181 */
1182 X509_free(sc->peer_pkeys[i].x509);
1183 sc->peer_pkeys[i].x509 = x;
1184 sc->peer_key = &(sc->peer_pkeys[i]);
1185
1186 X509_free(s->session->peer);
1187 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1188 s->session->peer = x;
1189 s->session->verify_result = s->verify_result;
1190
1191 x = NULL;
1192 ret = 1;
1193
1194 if (0) {
1195 truncated:
1196 /* wrong packet length */
1197 al = SSL_AD_DECODE_ERROR;
1198 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1199 f_err:
1200 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1201 }
1202 err:
1203 EVP_PKEY_free(pkey);
1204 X509_free(x);
1205 sk_X509_pop_free(sk, X509_free);
1206
1207 return (ret);
1208 }
1209
1210 static int
ssl3_get_server_kex_dhe(SSL * s,EVP_PKEY ** pkey,CBS * cbs)1211 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs)
1212 {
1213 CBS dhp, dhg, dhpk;
1214 BN_CTX *bn_ctx = NULL;
1215 SESS_CERT *sc = NULL;
1216 DH *dh = NULL;
1217 long alg_a;
1218 int al;
1219
1220 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1221 sc = SSI(s)->sess_cert;
1222
1223 if ((dh = DH_new()) == NULL) {
1224 SSLerror(s, ERR_R_DH_LIB);
1225 goto err;
1226 }
1227
1228 if (!CBS_get_u16_length_prefixed(cbs, &dhp))
1229 goto truncated;
1230 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) {
1231 SSLerror(s, ERR_R_BN_LIB);
1232 goto err;
1233 }
1234
1235 if (!CBS_get_u16_length_prefixed(cbs, &dhg))
1236 goto truncated;
1237 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) {
1238 SSLerror(s, ERR_R_BN_LIB);
1239 goto err;
1240 }
1241
1242 if (!CBS_get_u16_length_prefixed(cbs, &dhpk))
1243 goto truncated;
1244 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk),
1245 NULL)) == NULL) {
1246 SSLerror(s, ERR_R_BN_LIB);
1247 goto err;
1248 }
1249
1250 /*
1251 * Check the strength of the DH key just constructed.
1252 * Discard keys weaker than 1024 bits.
1253 */
1254 if (DH_size(dh) < 1024 / 8) {
1255 SSLerror(s, SSL_R_BAD_DH_P_LENGTH);
1256 goto err;
1257 }
1258
1259 if (alg_a & SSL_aRSA)
1260 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509);
1261 else
1262 /* XXX - Anonymous DH, so no certificate or pkey. */
1263 *pkey = NULL;
1264
1265 sc->peer_dh_tmp = dh;
1266
1267 return (1);
1268
1269 truncated:
1270 al = SSL_AD_DECODE_ERROR;
1271 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1272 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1273
1274 err:
1275 DH_free(dh);
1276 BN_CTX_free(bn_ctx);
1277
1278 return (-1);
1279 }
1280
1281 static int
ssl3_get_server_kex_ecdhe_ecp(SSL * s,SESS_CERT * sc,int nid,CBS * public)1282 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public)
1283 {
1284 EC_KEY *ecdh = NULL;
1285 int ret = -1;
1286
1287 /* Extract the server's ephemeral ECDH public key. */
1288 if ((ecdh = EC_KEY_new()) == NULL) {
1289 SSLerror(s, ERR_R_MALLOC_FAILURE);
1290 goto err;
1291 }
1292 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) {
1293 SSLerror(s, SSL_R_BAD_ECPOINT);
1294 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1295 goto err;
1296 }
1297
1298 sc->peer_nid = nid;
1299 sc->peer_ecdh_tmp = ecdh;
1300 ecdh = NULL;
1301
1302 ret = 1;
1303
1304 err:
1305 EC_KEY_free(ecdh);
1306
1307 return (ret);
1308 }
1309
1310 static int
ssl3_get_server_kex_ecdhe_ecx(SSL * s,SESS_CERT * sc,int nid,CBS * public)1311 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public)
1312 {
1313 size_t outlen;
1314
1315 if (nid != NID_X25519) {
1316 SSLerror(s, ERR_R_INTERNAL_ERROR);
1317 goto err;
1318 }
1319
1320 if (CBS_len(public) != X25519_KEY_LENGTH) {
1321 SSLerror(s, SSL_R_BAD_ECPOINT);
1322 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1323 goto err;
1324 }
1325
1326 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) {
1327 SSLerror(s, ERR_R_MALLOC_FAILURE);
1328 goto err;
1329 }
1330
1331 return (1);
1332
1333 err:
1334 return (-1);
1335 }
1336
1337 static int
ssl3_get_server_kex_ecdhe(SSL * s,EVP_PKEY ** pkey,CBS * cbs)1338 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs)
1339 {
1340 CBS public;
1341 uint8_t curve_type;
1342 uint16_t curve_id;
1343 SESS_CERT *sc;
1344 long alg_a;
1345 int nid;
1346 int al;
1347
1348 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1349 sc = SSI(s)->sess_cert;
1350
1351 /* Only named curves are supported. */
1352 if (!CBS_get_u8(cbs, &curve_type) ||
1353 curve_type != NAMED_CURVE_TYPE ||
1354 !CBS_get_u16(cbs, &curve_id)) {
1355 al = SSL_AD_DECODE_ERROR;
1356 SSLerror(s, SSL_R_LENGTH_TOO_SHORT);
1357 goto f_err;
1358 }
1359
1360 /*
1361 * Check that the curve is one of our preferences - if it is not,
1362 * the server has sent us an invalid curve.
1363 */
1364 if (tls1_check_curve(s, curve_id) != 1) {
1365 al = SSL_AD_DECODE_ERROR;
1366 SSLerror(s, SSL_R_WRONG_CURVE);
1367 goto f_err;
1368 }
1369
1370 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) {
1371 al = SSL_AD_INTERNAL_ERROR;
1372 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1373 goto f_err;
1374 }
1375
1376 if (!CBS_get_u8_length_prefixed(cbs, &public))
1377 goto truncated;
1378
1379 if (nid == NID_X25519) {
1380 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1)
1381 goto err;
1382 } else {
1383 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1)
1384 goto err;
1385 }
1386
1387 /*
1388 * The ECC/TLS specification does not mention the use of DSA to sign
1389 * ECParameters in the server key exchange message. We do support RSA
1390 * and ECDSA.
1391 */
1392 if (alg_a & SSL_aRSA)
1393 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509);
1394 else if (alg_a & SSL_aECDSA)
1395 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509);
1396 else
1397 /* XXX - Anonymous ECDH, so no certificate or pkey. */
1398 *pkey = NULL;
1399
1400 return (1);
1401
1402 truncated:
1403 al = SSL_AD_DECODE_ERROR;
1404 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1405
1406 f_err:
1407 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1408
1409 err:
1410 return (-1);
1411 }
1412
1413 int
ssl3_get_server_key_exchange(SSL * s)1414 ssl3_get_server_key_exchange(SSL *s)
1415 {
1416 CBS cbs, signature;
1417 const EVP_MD *md = NULL;
1418 EVP_PKEY *pkey = NULL;
1419 EVP_MD_CTX md_ctx;
1420 const unsigned char *param;
1421 long n, alg_k, alg_a;
1422 int al, ok;
1423 size_t param_len;
1424
1425 EVP_MD_CTX_init(&md_ctx);
1426
1427 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
1428 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1429
1430 /*
1431 * Use same message size as in ssl3_get_certificate_request()
1432 * as ServerKeyExchange message may be skipped.
1433 */
1434 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A,
1435 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok);
1436 if (!ok)
1437 return ((int)n);
1438
1439 if (n < 0)
1440 goto err;
1441
1442 CBS_init(&cbs, s->internal->init_msg, n);
1443
1444 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1445 /*
1446 * Do not skip server key exchange if this cipher suite uses
1447 * ephemeral keys.
1448 */
1449 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
1450 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
1451 al = SSL_AD_UNEXPECTED_MESSAGE;
1452 goto f_err;
1453 }
1454
1455 S3I(s)->tmp.reuse_message = 1;
1456 EVP_MD_CTX_cleanup(&md_ctx);
1457 return (1);
1458 }
1459
1460 if (SSI(s)->sess_cert != NULL) {
1461 DH_free(SSI(s)->sess_cert->peer_dh_tmp);
1462 SSI(s)->sess_cert->peer_dh_tmp = NULL;
1463
1464 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp);
1465 SSI(s)->sess_cert->peer_ecdh_tmp = NULL;
1466
1467 free(SSI(s)->sess_cert->peer_x25519_tmp);
1468 SSI(s)->sess_cert->peer_x25519_tmp = NULL;
1469 } else {
1470 SSI(s)->sess_cert = ssl_sess_cert_new();
1471 if (SSI(s)->sess_cert == NULL)
1472 goto err;
1473 }
1474
1475 param = CBS_data(&cbs);
1476 param_len = CBS_len(&cbs);
1477
1478 if (alg_k & SSL_kDHE) {
1479 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1)
1480 goto err;
1481 } else if (alg_k & SSL_kECDHE) {
1482 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1)
1483 goto err;
1484 } else if (alg_k != 0) {
1485 al = SSL_AD_UNEXPECTED_MESSAGE;
1486 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
1487 goto f_err;
1488 }
1489
1490 param_len -= CBS_len(&cbs);
1491
1492 /* if it was signed, check the signature */
1493 if (pkey != NULL) {
1494 EVP_PKEY_CTX *pctx;
1495 const struct ssl_sigalg *sigalg;
1496
1497 if (SSL_USE_SIGALGS(s)) {
1498 uint16_t sigalg_value;
1499
1500 if (!CBS_get_u16(&cbs, &sigalg_value))
1501 goto truncated;
1502 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs,
1503 tls12_sigalgs_len)) == NULL) {
1504 SSLerror(s, SSL_R_UNKNOWN_DIGEST);
1505 al = SSL_AD_DECODE_ERROR;
1506 goto f_err;
1507 }
1508 if ((md = sigalg->md()) == NULL) {
1509 SSLerror(s, SSL_R_UNKNOWN_DIGEST);
1510 al = SSL_AD_DECODE_ERROR;
1511 goto f_err;
1512 }
1513 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) {
1514 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE);
1515 al = SSL_AD_DECODE_ERROR;
1516 goto f_err;
1517 }
1518 } else if (pkey->type == EVP_PKEY_RSA) {
1519 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1);
1520 } else if (pkey->type == EVP_PKEY_EC) {
1521 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1);
1522 } else {
1523 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE);
1524 al = SSL_AD_DECODE_ERROR;
1525 goto f_err;
1526 }
1527 md = sigalg->md();
1528
1529 if (!CBS_get_u16_length_prefixed(&cbs, &signature))
1530 goto truncated;
1531 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) {
1532 al = SSL_AD_DECODE_ERROR;
1533 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH);
1534 goto f_err;
1535 }
1536
1537 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey))
1538 goto err;
1539 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random,
1540 SSL3_RANDOM_SIZE))
1541 goto err;
1542 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
1543 (!EVP_PKEY_CTX_set_rsa_padding(pctx,
1544 RSA_PKCS1_PSS_PADDING) ||
1545 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1)))
1546 goto err;
1547 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random,
1548 SSL3_RANDOM_SIZE))
1549 goto err;
1550 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len))
1551 goto err;
1552 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature),
1553 CBS_len(&signature)) <= 0) {
1554 al = SSL_AD_DECRYPT_ERROR;
1555 SSLerror(s, SSL_R_BAD_SIGNATURE);
1556 goto f_err;
1557 }
1558 } else {
1559 /* aNULL does not need public keys. */
1560 if (!(alg_a & SSL_aNULL)) {
1561 SSLerror(s, ERR_R_INTERNAL_ERROR);
1562 goto err;
1563 }
1564 }
1565
1566 if (CBS_len(&cbs) != 0) {
1567 al = SSL_AD_DECODE_ERROR;
1568 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE);
1569 goto f_err;
1570 }
1571
1572 EVP_PKEY_free(pkey);
1573 EVP_MD_CTX_cleanup(&md_ctx);
1574
1575 return (1);
1576
1577 truncated:
1578 al = SSL_AD_DECODE_ERROR;
1579 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1580
1581 f_err:
1582 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1583
1584 err:
1585 EVP_PKEY_free(pkey);
1586 EVP_MD_CTX_cleanup(&md_ctx);
1587
1588 return (-1);
1589 }
1590
1591 int
ssl3_get_certificate_request(SSL * s)1592 ssl3_get_certificate_request(SSL *s)
1593 {
1594 int ok, ret = 0;
1595 long n;
1596 uint8_t ctype_num;
1597 CBS cert_request, ctypes, rdn_list;
1598 X509_NAME *xn = NULL;
1599 const unsigned char *q;
1600 STACK_OF(X509_NAME) *ca_sk = NULL;
1601
1602 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A,
1603 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok);
1604 if (!ok)
1605 return ((int)n);
1606
1607 S3I(s)->tmp.cert_req = 0;
1608
1609 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) {
1610 S3I(s)->tmp.reuse_message = 1;
1611 /*
1612 * If we get here we don't need any cached handshake records
1613 * as we wont be doing client auth.
1614 */
1615 tls1_transcript_free(s);
1616 return (1);
1617 }
1618
1619 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
1620 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1621 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE);
1622 goto err;
1623 }
1624
1625 /* TLS does not like anon-DH with client cert */
1626 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) {
1627 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1628 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1629 goto err;
1630 }
1631
1632 if (n < 0)
1633 goto truncated;
1634 CBS_init(&cert_request, s->internal->init_msg, n);
1635
1636 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
1637 SSLerror(s, ERR_R_MALLOC_FAILURE);
1638 goto err;
1639 }
1640
1641 /* get the certificate types */
1642 if (!CBS_get_u8(&cert_request, &ctype_num))
1643 goto truncated;
1644
1645 if (ctype_num > SSL3_CT_NUMBER)
1646 ctype_num = SSL3_CT_NUMBER;
1647 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) ||
1648 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype,
1649 sizeof(S3I(s)->tmp.ctype), NULL)) {
1650 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1651 goto err;
1652 }
1653
1654 if (SSL_USE_SIGALGS(s)) {
1655 CBS sigalgs;
1656
1657 if (CBS_len(&cert_request) < 2) {
1658 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1659 goto err;
1660 }
1661 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) {
1662 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1663 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1664 goto err;
1665 }
1666 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) {
1667 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1668 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1669 goto err;
1670 }
1671 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs,
1672 &S3I(s)->hs.sigalgs_len))
1673 goto err;
1674 }
1675
1676 /* get the CA RDNs */
1677 if (CBS_len(&cert_request) < 2) {
1678 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1679 goto err;
1680 }
1681
1682 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) ||
1683 CBS_len(&cert_request) != 0) {
1684 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1685 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1686 goto err;
1687 }
1688
1689 while (CBS_len(&rdn_list) > 0) {
1690 CBS rdn;
1691
1692 if (CBS_len(&rdn_list) < 2) {
1693 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1694 goto err;
1695 }
1696
1697 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) {
1698 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1699 SSLerror(s, SSL_R_CA_DN_TOO_LONG);
1700 goto err;
1701 }
1702
1703 q = CBS_data(&rdn);
1704 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) {
1705 ssl3_send_alert(s, SSL3_AL_FATAL,
1706 SSL_AD_DECODE_ERROR);
1707 SSLerror(s, ERR_R_ASN1_LIB);
1708 goto err;
1709 }
1710
1711 if (q != CBS_data(&rdn) + CBS_len(&rdn)) {
1712 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1713 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH);
1714 goto err;
1715 }
1716 if (!sk_X509_NAME_push(ca_sk, xn)) {
1717 SSLerror(s, ERR_R_MALLOC_FAILURE);
1718 goto err;
1719 }
1720 xn = NULL; /* avoid free in err block */
1721 }
1722
1723 /* we should setup a certificate to return.... */
1724 S3I(s)->tmp.cert_req = 1;
1725 S3I(s)->tmp.ctype_num = ctype_num;
1726 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free);
1727 S3I(s)->tmp.ca_names = ca_sk;
1728 ca_sk = NULL;
1729
1730 ret = 1;
1731 if (0) {
1732 truncated:
1733 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1734 }
1735 err:
1736 X509_NAME_free(xn);
1737 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
1738 return (ret);
1739 }
1740
1741 static int
ca_dn_cmp(const X509_NAME * const * a,const X509_NAME * const * b)1742 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1743 {
1744 return (X509_NAME_cmp(*a, *b));
1745 }
1746
1747 int
ssl3_get_new_session_ticket(SSL * s)1748 ssl3_get_new_session_ticket(SSL *s)
1749 {
1750 int ok, al, ret = 0;
1751 uint32_t lifetime_hint;
1752 long n;
1753 CBS cbs, session_ticket;
1754
1755 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A,
1756 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok);
1757 if (!ok)
1758 return ((int)n);
1759
1760 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) {
1761 S3I(s)->tmp.reuse_message = 1;
1762 return (1);
1763 }
1764 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) {
1765 al = SSL_AD_UNEXPECTED_MESSAGE;
1766 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
1767 goto f_err;
1768 }
1769
1770 if (n < 0) {
1771 al = SSL_AD_DECODE_ERROR;
1772 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1773 goto f_err;
1774 }
1775
1776 CBS_init(&cbs, s->internal->init_msg, n);
1777 if (!CBS_get_u32(&cbs, &lifetime_hint) ||
1778 #if UINT32_MAX > LONG_MAX
1779 lifetime_hint > LONG_MAX ||
1780 #endif
1781 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) ||
1782 CBS_len(&cbs) != 0) {
1783 al = SSL_AD_DECODE_ERROR;
1784 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1785 goto f_err;
1786 }
1787 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint;
1788
1789 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick,
1790 &s->session->tlsext_ticklen)) {
1791 SSLerror(s, ERR_R_MALLOC_FAILURE);
1792 goto err;
1793 }
1794
1795 /*
1796 * There are two ways to detect a resumed ticket sesion.
1797 * One is to set an appropriate session ID and then the server
1798 * must return a match in ServerHello. This allows the normal
1799 * client session ID matching to work and we know much
1800 * earlier that the ticket has been accepted.
1801 *
1802 * The other way is to set zero length session ID when the
1803 * ticket is presented and rely on the handshake to determine
1804 * session resumption.
1805 *
1806 * We choose the former approach because this fits in with
1807 * assumptions elsewhere in OpenSSL. The session ID is set
1808 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1809 * ticket.
1810 */
1811 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket),
1812 s->session->session_id, &s->session->session_id_length,
1813 EVP_sha256(), NULL);
1814 ret = 1;
1815 return (ret);
1816 f_err:
1817 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1818 err:
1819 return (-1);
1820 }
1821
1822 int
ssl3_get_cert_status(SSL * s)1823 ssl3_get_cert_status(SSL *s)
1824 {
1825 CBS cert_status, response;
1826 int ok, al;
1827 long n;
1828 uint8_t status_type;
1829
1830 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A,
1831 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS,
1832 16384, &ok);
1833 if (!ok)
1834 return ((int)n);
1835
1836 if (n < 0) {
1837 /* need at least status type + length */
1838 al = SSL_AD_DECODE_ERROR;
1839 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1840 goto f_err;
1841 }
1842
1843 CBS_init(&cert_status, s->internal->init_msg, n);
1844 if (!CBS_get_u8(&cert_status, &status_type) ||
1845 CBS_len(&cert_status) < 3) {
1846 /* need at least status type + length */
1847 al = SSL_AD_DECODE_ERROR;
1848 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1849 goto f_err;
1850 }
1851
1852 if (status_type != TLSEXT_STATUSTYPE_ocsp) {
1853 al = SSL_AD_DECODE_ERROR;
1854 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE);
1855 goto f_err;
1856 }
1857
1858 if (!CBS_get_u24_length_prefixed(&cert_status, &response) ||
1859 CBS_len(&cert_status) != 0) {
1860 al = SSL_AD_DECODE_ERROR;
1861 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1862 goto f_err;
1863 }
1864
1865 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp,
1866 &s->internal->tlsext_ocsp_resp_len)) {
1867 al = SSL_AD_INTERNAL_ERROR;
1868 SSLerror(s, ERR_R_MALLOC_FAILURE);
1869 goto f_err;
1870 }
1871
1872 if (s->ctx->internal->tlsext_status_cb) {
1873 int ret;
1874 ret = s->ctx->internal->tlsext_status_cb(s,
1875 s->ctx->internal->tlsext_status_arg);
1876 if (ret == 0) {
1877 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1878 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE);
1879 goto f_err;
1880 }
1881 if (ret < 0) {
1882 al = SSL_AD_INTERNAL_ERROR;
1883 SSLerror(s, ERR_R_MALLOC_FAILURE);
1884 goto f_err;
1885 }
1886 }
1887 return (1);
1888 f_err:
1889 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1890 return (-1);
1891 }
1892
1893 int
ssl3_get_server_done(SSL * s)1894 ssl3_get_server_done(SSL *s)
1895 {
1896 int ok, ret = 0;
1897 long n;
1898
1899 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A,
1900 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE,
1901 30, /* should be very small, like 0 :-) */ &ok);
1902 if (!ok)
1903 return ((int)n);
1904
1905 if (n > 0) {
1906 /* should contain no data */
1907 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1908 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1909 return (-1);
1910 }
1911 ret = 1;
1912 return (ret);
1913 }
1914
1915 static int
ssl3_send_client_kex_rsa(SSL * s,SESS_CERT * sess_cert,CBB * cbb)1916 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
1917 {
1918 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH];
1919 unsigned char *enc_pms = NULL;
1920 EVP_PKEY *pkey = NULL;
1921 int ret = -1;
1922 int enc_len;
1923 CBB epms;
1924
1925 /*
1926 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1.
1927 */
1928
1929 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509);
1930 if (pkey == NULL || pkey->type != EVP_PKEY_RSA ||
1931 pkey->pkey.rsa == NULL) {
1932 SSLerror(s, ERR_R_INTERNAL_ERROR);
1933 goto err;
1934 }
1935
1936 pms[0] = s->client_version >> 8;
1937 pms[1] = s->client_version & 0xff;
1938 arc4random_buf(&pms[2], sizeof(pms) - 2);
1939
1940 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) {
1941 SSLerror(s, ERR_R_MALLOC_FAILURE);
1942 goto err;
1943 }
1944
1945 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa,
1946 RSA_PKCS1_PADDING);
1947 if (enc_len <= 0) {
1948 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT);
1949 goto err;
1950 }
1951
1952 if (!CBB_add_u16_length_prefixed(cbb, &epms))
1953 goto err;
1954 if (!CBB_add_bytes(&epms, enc_pms, enc_len))
1955 goto err;
1956 if (!CBB_flush(cbb))
1957 goto err;
1958
1959 s->session->master_key_length =
1960 tls1_generate_master_secret(s,
1961 s->session->master_key, pms, sizeof(pms));
1962
1963 ret = 1;
1964
1965 err:
1966 explicit_bzero(pms, sizeof(pms));
1967 EVP_PKEY_free(pkey);
1968 free(enc_pms);
1969
1970 return (ret);
1971 }
1972
1973 static int
ssl3_send_client_kex_dhe(SSL * s,SESS_CERT * sess_cert,CBB * cbb)1974 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
1975 {
1976 DH *dh_srvr = NULL, *dh_clnt = NULL;
1977 unsigned char *key = NULL;
1978 int key_size = 0, key_len;
1979 unsigned char *data;
1980 int ret = -1;
1981 CBB dh_Yc;
1982
1983 /* Ensure that we have an ephemeral key for DHE. */
1984 if (sess_cert->peer_dh_tmp == NULL) {
1985 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1986 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1987 goto err;
1988 }
1989 dh_srvr = sess_cert->peer_dh_tmp;
1990
1991 /* Generate a new random key. */
1992 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
1993 SSLerror(s, ERR_R_DH_LIB);
1994 goto err;
1995 }
1996 if (!DH_generate_key(dh_clnt)) {
1997 SSLerror(s, ERR_R_DH_LIB);
1998 goto err;
1999 }
2000 if ((key_size = DH_size(dh_clnt)) <= 0) {
2001 SSLerror(s, ERR_R_DH_LIB);
2002 goto err;
2003 }
2004 if ((key = malloc(key_size)) == NULL) {
2005 SSLerror(s, ERR_R_MALLOC_FAILURE);
2006 goto err;
2007 }
2008 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) {
2009 SSLerror(s, ERR_R_DH_LIB);
2010 goto err;
2011 }
2012
2013 /* Generate master key from the result. */
2014 s->session->master_key_length =
2015 tls1_generate_master_secret(s,
2016 s->session->master_key, key, key_len);
2017
2018 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc))
2019 goto err;
2020 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key)))
2021 goto err;
2022 BN_bn2bin(dh_clnt->pub_key, data);
2023 if (!CBB_flush(cbb))
2024 goto err;
2025
2026 ret = 1;
2027
2028 err:
2029 DH_free(dh_clnt);
2030 freezero(key, key_size);
2031
2032 return (ret);
2033 }
2034
2035 static int
ssl3_send_client_kex_ecdhe_ecp(SSL * s,SESS_CERT * sc,CBB * cbb)2036 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb)
2037 {
2038 EC_KEY *ecdh = NULL;
2039 uint8_t *key = NULL;
2040 size_t key_len = 0;
2041 int ret = -1;
2042 CBB ecpoint;
2043
2044 if ((ecdh = EC_KEY_new()) == NULL) {
2045 SSLerror(s, ERR_R_MALLOC_FAILURE);
2046 goto err;
2047 }
2048
2049 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid))
2050 goto err;
2051
2052 /* Encode our public key. */
2053 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
2054 goto err;
2055 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint))
2056 goto err;
2057 if (!CBB_flush(cbb))
2058 goto err;
2059
2060 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len))
2061 goto err;
2062 s->session->master_key_length = tls1_generate_master_secret(s,
2063 s->session->master_key, key, key_len);
2064
2065 ret = 1;
2066
2067 err:
2068 freezero(key, key_len);
2069 EC_KEY_free(ecdh);
2070
2071 return (ret);
2072 }
2073
2074 static int
ssl3_send_client_kex_ecdhe_ecx(SSL * s,SESS_CERT * sc,CBB * cbb)2075 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb)
2076 {
2077 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL;
2078 int ret = -1;
2079 CBB ecpoint;
2080
2081 /* Generate X25519 key pair and derive shared key. */
2082 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL)
2083 goto err;
2084 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL)
2085 goto err;
2086 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL)
2087 goto err;
2088 X25519_keypair(public_key, private_key);
2089 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp))
2090 goto err;
2091
2092 /* Serialize the public key. */
2093 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
2094 goto err;
2095 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH))
2096 goto err;
2097 if (!CBB_flush(cbb))
2098 goto err;
2099
2100 /* Generate master key from the result. */
2101 s->session->master_key_length =
2102 tls1_generate_master_secret(s,
2103 s->session->master_key, shared_key, X25519_KEY_LENGTH);
2104
2105 ret = 1;
2106
2107 err:
2108 free(public_key);
2109 freezero(private_key, X25519_KEY_LENGTH);
2110 freezero(shared_key, X25519_KEY_LENGTH);
2111
2112 return (ret);
2113 }
2114
2115 static int
ssl3_send_client_kex_ecdhe(SSL * s,SESS_CERT * sc,CBB * cbb)2116 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb)
2117 {
2118 if (sc->peer_x25519_tmp != NULL) {
2119 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1)
2120 goto err;
2121 } else if (sc->peer_ecdh_tmp != NULL) {
2122 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1)
2123 goto err;
2124 } else {
2125 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2126 SSLerror(s, ERR_R_INTERNAL_ERROR);
2127 goto err;
2128 }
2129
2130 return (1);
2131
2132 err:
2133 return (-1);
2134 }
2135
2136 static int
ssl3_send_client_kex_gost(SSL * s,SESS_CERT * sess_cert,CBB * cbb)2137 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
2138 {
2139 unsigned char premaster_secret[32], shared_ukm[32], tmp[256];
2140 EVP_PKEY *pub_key = NULL;
2141 EVP_PKEY_CTX *pkey_ctx;
2142 X509 *peer_cert;
2143 size_t msglen;
2144 unsigned int md_len;
2145 EVP_MD_CTX *ukm_hash;
2146 int ret = -1;
2147 int nid;
2148 CBB gostblob;
2149
2150 /* Get server sertificate PKEY and create ctx from it */
2151 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509;
2152 if (peer_cert == NULL) {
2153 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2154 goto err;
2155 }
2156
2157 pub_key = X509_get_pubkey(peer_cert);
2158 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL);
2159
2160 /*
2161 * If we have send a certificate, and certificate key parameters match
2162 * those of server certificate, use certificate key for key exchange.
2163 * Otherwise, generate ephemeral key pair.
2164 */
2165 EVP_PKEY_encrypt_init(pkey_ctx);
2166
2167 /* Generate session key. */
2168 arc4random_buf(premaster_secret, 32);
2169
2170 /*
2171 * If we have client certificate, use its secret as peer key.
2172 */
2173 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) {
2174 if (EVP_PKEY_derive_set_peer(pkey_ctx,
2175 s->cert->key->privatekey) <=0) {
2176 /*
2177 * If there was an error - just ignore it.
2178 * Ephemeral key would be used.
2179 */
2180 ERR_clear_error();
2181 }
2182 }
2183
2184 /*
2185 * Compute shared IV and store it in algorithm-specific context data.
2186 */
2187 ukm_hash = EVP_MD_CTX_new();
2188 if (ukm_hash == NULL) {
2189 SSLerror(s, ERR_R_MALLOC_FAILURE);
2190 goto err;
2191 }
2192
2193 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94)
2194 nid = NID_id_GostR3411_94;
2195 else
2196 nid = NID_id_tc26_gost3411_2012_256;
2197 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid)))
2198 goto err;
2199 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE);
2200 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE);
2201 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2202 EVP_MD_CTX_free(ukm_hash);
2203 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
2204 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) {
2205 SSLerror(s, SSL_R_LIBRARY_BUG);
2206 goto err;
2207 }
2208
2209 /*
2210 * Make GOST keytransport blob message, encapsulate it into sequence.
2211 */
2212 msglen = 255;
2213 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret,
2214 32) < 0) {
2215 SSLerror(s, SSL_R_LIBRARY_BUG);
2216 goto err;
2217 }
2218
2219 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE))
2220 goto err;
2221 if (!CBB_add_bytes(&gostblob, tmp, msglen))
2222 goto err;
2223 if (!CBB_flush(cbb))
2224 goto err;
2225
2226 /* Check if pubkey from client certificate was used. */
2227 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2,
2228 NULL) > 0) {
2229 /* Set flag "skip certificate verify". */
2230 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2231 }
2232 EVP_PKEY_CTX_free(pkey_ctx);
2233 s->session->master_key_length =
2234 tls1_generate_master_secret(s,
2235 s->session->master_key, premaster_secret, 32);
2236
2237 ret = 1;
2238
2239 err:
2240 explicit_bzero(premaster_secret, sizeof(premaster_secret));
2241 EVP_PKEY_free(pub_key);
2242
2243 return (ret);
2244 }
2245
2246 int
ssl3_send_client_key_exchange(SSL * s)2247 ssl3_send_client_key_exchange(SSL *s)
2248 {
2249 SESS_CERT *sess_cert;
2250 unsigned long alg_k;
2251 CBB cbb, kex;
2252
2253 memset(&cbb, 0, sizeof(cbb));
2254
2255 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) {
2256 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
2257
2258 if ((sess_cert = SSI(s)->sess_cert) == NULL) {
2259 ssl3_send_alert(s, SSL3_AL_FATAL,
2260 SSL_AD_UNEXPECTED_MESSAGE);
2261 SSLerror(s, ERR_R_INTERNAL_ERROR);
2262 goto err;
2263 }
2264
2265 if (!ssl3_handshake_msg_start(s, &cbb, &kex,
2266 SSL3_MT_CLIENT_KEY_EXCHANGE))
2267 goto err;
2268
2269 if (alg_k & SSL_kRSA) {
2270 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1)
2271 goto err;
2272 } else if (alg_k & SSL_kDHE) {
2273 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1)
2274 goto err;
2275 } else if (alg_k & SSL_kECDHE) {
2276 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1)
2277 goto err;
2278 } else if (alg_k & SSL_kGOST) {
2279 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1)
2280 goto err;
2281 } else {
2282 ssl3_send_alert(s, SSL3_AL_FATAL,
2283 SSL_AD_HANDSHAKE_FAILURE);
2284 SSLerror(s, ERR_R_INTERNAL_ERROR);
2285 goto err;
2286 }
2287
2288 if (!ssl3_handshake_msg_finish(s, &cbb))
2289 goto err;
2290
2291 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B;
2292 }
2293
2294 /* SSL3_ST_CW_KEY_EXCH_B */
2295 return (ssl3_handshake_write(s));
2296
2297 err:
2298 CBB_cleanup(&cbb);
2299
2300 return (-1);
2301 }
2302
2303 static int
ssl3_send_client_verify_sigalgs(SSL * s,CBB * cert_verify)2304 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify)
2305 {
2306 const struct ssl_sigalg *sigalg;
2307 CBB cbb_signature;
2308 EVP_PKEY_CTX *pctx = NULL;
2309 EVP_PKEY *pkey;
2310 EVP_MD_CTX mctx;
2311 const EVP_MD *md;
2312 const unsigned char *hdata;
2313 unsigned char *signature = NULL;
2314 size_t signature_len, hdata_len;
2315 int ret = 0;
2316
2317 EVP_MD_CTX_init(&mctx);
2318
2319 pkey = s->cert->key->privatekey;
2320 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) {
2321 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2322 goto err;
2323 }
2324 if ((md = sigalg->md()) == NULL) {
2325 SSLerror(s, SSL_R_UNKNOWN_DIGEST);
2326 goto err;
2327 }
2328
2329 if (!tls1_transcript_data(s, &hdata, &hdata_len)) {
2330 SSLerror(s, ERR_R_INTERNAL_ERROR);
2331 goto err;
2332 }
2333 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) {
2334 SSLerror(s, ERR_R_EVP_LIB);
2335 goto err;
2336 }
2337 if (sigalg->key_type == EVP_PKEY_GOSTR01 &&
2338 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
2339 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) {
2340 SSLerror(s, ERR_R_EVP_LIB);
2341 goto err;
2342 }
2343 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
2344 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
2345 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) {
2346 SSLerror(s, ERR_R_EVP_LIB);
2347 goto err;
2348 }
2349 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) {
2350 SSLerror(s, ERR_R_EVP_LIB);
2351 goto err;
2352 }
2353 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) ||
2354 signature_len == 0) {
2355 SSLerror(s, ERR_R_EVP_LIB);
2356 goto err;
2357 }
2358 if ((signature = calloc(1, signature_len)) == NULL) {
2359 SSLerror(s, ERR_R_MALLOC_FAILURE);
2360 goto err;
2361 }
2362 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) {
2363 SSLerror(s, ERR_R_EVP_LIB);
2364 goto err;
2365 }
2366
2367 if (!CBB_add_u16(cert_verify, sigalg->value))
2368 goto err;
2369 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature))
2370 goto err;
2371 if (!CBB_add_bytes(&cbb_signature, signature, signature_len))
2372 goto err;
2373 if (!CBB_flush(cert_verify))
2374 goto err;
2375
2376 ret = 1;
2377
2378 err:
2379 EVP_MD_CTX_cleanup(&mctx);
2380 free(signature);
2381 return ret;
2382 }
2383
2384 static int
ssl3_send_client_verify_rsa(SSL * s,CBB * cert_verify)2385 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify)
2386 {
2387 CBB cbb_signature;
2388 EVP_PKEY *pkey;
2389 unsigned char data[EVP_MAX_MD_SIZE];
2390 unsigned char *signature = NULL;
2391 unsigned int signature_len;
2392 size_t data_len;
2393 int ret = 0;
2394
2395 pkey = s->cert->key->privatekey;
2396
2397 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len))
2398 goto err;
2399 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL)
2400 goto err;
2401 if (RSA_sign(NID_md5_sha1, data, data_len, signature,
2402 &signature_len, pkey->pkey.rsa) <= 0 ) {
2403 SSLerror(s, ERR_R_RSA_LIB);
2404 goto err;
2405 }
2406
2407 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature))
2408 goto err;
2409 if (!CBB_add_bytes(&cbb_signature, signature, signature_len))
2410 goto err;
2411 if (!CBB_flush(cert_verify))
2412 goto err;
2413
2414 ret = 1;
2415 err:
2416 free(signature);
2417 return ret;
2418 }
2419
2420 static int
ssl3_send_client_verify_ec(SSL * s,CBB * cert_verify)2421 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify)
2422 {
2423 CBB cbb_signature;
2424 EVP_PKEY *pkey;
2425 unsigned char data[EVP_MAX_MD_SIZE];
2426 unsigned char *signature = NULL;
2427 unsigned int signature_len;
2428 int ret = 0;
2429
2430 pkey = s->cert->key->privatekey;
2431
2432 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL))
2433 goto err;
2434 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL)
2435 goto err;
2436 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH],
2437 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) {
2438 SSLerror(s, ERR_R_ECDSA_LIB);
2439 goto err;
2440 }
2441
2442 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature))
2443 goto err;
2444 if (!CBB_add_bytes(&cbb_signature, signature, signature_len))
2445 goto err;
2446 if (!CBB_flush(cert_verify))
2447 goto err;
2448
2449 ret = 1;
2450 err:
2451 free(signature);
2452 return ret;
2453 }
2454
2455 #ifndef OPENSSL_NO_GOST
2456 static int
ssl3_send_client_verify_gost(SSL * s,CBB * cert_verify)2457 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify)
2458 {
2459 CBB cbb_signature;
2460 EVP_MD_CTX mctx;
2461 EVP_PKEY_CTX *pctx;
2462 EVP_PKEY *pkey;
2463 const EVP_MD *md;
2464 const unsigned char *hdata;
2465 unsigned char *signature = NULL;
2466 size_t signature_len;
2467 size_t hdata_len;
2468 int nid;
2469 int ret = 0;
2470
2471 EVP_MD_CTX_init(&mctx);
2472
2473 pkey = s->cert->key->privatekey;
2474
2475 if (!tls1_transcript_data(s, &hdata, &hdata_len)) {
2476 SSLerror(s, ERR_R_INTERNAL_ERROR);
2477 goto err;
2478 }
2479 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
2480 (md = EVP_get_digestbynid(nid)) == NULL) {
2481 SSLerror(s, ERR_R_EVP_LIB);
2482 goto err;
2483 }
2484 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) {
2485 SSLerror(s, ERR_R_EVP_LIB);
2486 goto err;
2487 }
2488 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
2489 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) {
2490 SSLerror(s, ERR_R_EVP_LIB);
2491 goto err;
2492 }
2493 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) {
2494 SSLerror(s, ERR_R_EVP_LIB);
2495 goto err;
2496 }
2497 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) ||
2498 signature_len == 0) {
2499 SSLerror(s, ERR_R_EVP_LIB);
2500 goto err;
2501 }
2502 if ((signature = calloc(1, signature_len)) == NULL) {
2503 SSLerror(s, ERR_R_MALLOC_FAILURE);
2504 goto err;
2505 }
2506 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) {
2507 SSLerror(s, ERR_R_EVP_LIB);
2508 goto err;
2509 }
2510
2511 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature))
2512 goto err;
2513 if (!CBB_add_bytes(&cbb_signature, signature, signature_len))
2514 goto err;
2515 if (!CBB_flush(cert_verify))
2516 goto err;
2517
2518 ret = 1;
2519 err:
2520 EVP_MD_CTX_cleanup(&mctx);
2521 free(signature);
2522 return ret;
2523 }
2524 #endif
2525
2526 int
ssl3_send_client_verify(SSL * s)2527 ssl3_send_client_verify(SSL *s)
2528 {
2529 CBB cbb, cert_verify;
2530 EVP_PKEY *pkey;
2531
2532 memset(&cbb, 0, sizeof(cbb));
2533
2534 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) {
2535 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify,
2536 SSL3_MT_CERTIFICATE_VERIFY))
2537 goto err;
2538
2539 pkey = s->cert->key->privatekey;
2540
2541 /*
2542 * For TLS v1.2 send signature algorithm and signature
2543 * using agreed digest and cached handshake records.
2544 */
2545 if (SSL_USE_SIGALGS(s)) {
2546 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify))
2547 goto err;
2548 } else if (pkey->type == EVP_PKEY_RSA) {
2549 if (!ssl3_send_client_verify_rsa(s, &cert_verify))
2550 goto err;
2551 } else if (pkey->type == EVP_PKEY_EC) {
2552 if (!ssl3_send_client_verify_ec(s, &cert_verify))
2553 goto err;
2554 #ifndef OPENSSL_NO_GOST
2555 } else if (pkey->type == NID_id_GostR3410_94 ||
2556 pkey->type == NID_id_GostR3410_2001) {
2557 if (!ssl3_send_client_verify_gost(s, &cert_verify))
2558 goto err;
2559 #endif
2560 } else {
2561 SSLerror(s, ERR_R_INTERNAL_ERROR);
2562 goto err;
2563 }
2564
2565 tls1_transcript_free(s);
2566
2567 if (!ssl3_handshake_msg_finish(s, &cbb))
2568 goto err;
2569
2570 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B;
2571 }
2572
2573 return (ssl3_handshake_write(s));
2574
2575 err:
2576 CBB_cleanup(&cbb);
2577
2578 return (-1);
2579 }
2580
2581 int
ssl3_send_client_certificate(SSL * s)2582 ssl3_send_client_certificate(SSL *s)
2583 {
2584 EVP_PKEY *pkey = NULL;
2585 X509 *x509 = NULL;
2586 CBB cbb, client_cert;
2587 int i;
2588
2589 memset(&cbb, 0, sizeof(cbb));
2590
2591 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) {
2592 if (s->cert->key->x509 == NULL ||
2593 s->cert->key->privatekey == NULL)
2594 S3I(s)->hs.state = SSL3_ST_CW_CERT_B;
2595 else
2596 S3I(s)->hs.state = SSL3_ST_CW_CERT_C;
2597 }
2598
2599 /* We need to get a client cert */
2600 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) {
2601 /*
2602 * If we get an error, we need to
2603 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2604 * We then get retied later
2605 */
2606 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2607 if (i < 0) {
2608 s->internal->rwstate = SSL_X509_LOOKUP;
2609 return (-1);
2610 }
2611 s->internal->rwstate = SSL_NOTHING;
2612 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
2613 S3I(s)->hs.state = SSL3_ST_CW_CERT_B;
2614 if (!SSL_use_certificate(s, x509) ||
2615 !SSL_use_PrivateKey(s, pkey))
2616 i = 0;
2617 } else if (i == 1) {
2618 i = 0;
2619 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2620 }
2621
2622 X509_free(x509);
2623 EVP_PKEY_free(pkey);
2624 if (i == 0) {
2625 S3I(s)->tmp.cert_req = 2;
2626
2627 /* There is no client certificate to verify. */
2628 tls1_transcript_free(s);
2629 }
2630
2631 /* Ok, we have a cert */
2632 S3I(s)->hs.state = SSL3_ST_CW_CERT_C;
2633 }
2634
2635 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) {
2636 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert,
2637 SSL3_MT_CERTIFICATE))
2638 goto err;
2639 if (!ssl3_output_cert_chain(s, &client_cert,
2640 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key))
2641 goto err;
2642 if (!ssl3_handshake_msg_finish(s, &cbb))
2643 goto err;
2644
2645 S3I(s)->hs.state = SSL3_ST_CW_CERT_D;
2646 }
2647
2648 /* SSL3_ST_CW_CERT_D */
2649 return (ssl3_handshake_write(s));
2650
2651 err:
2652 CBB_cleanup(&cbb);
2653
2654 return (0);
2655 }
2656
2657 #define has_bits(i,m) (((i)&(m)) == (m))
2658
2659 int
ssl3_check_cert_and_algorithm(SSL * s)2660 ssl3_check_cert_and_algorithm(SSL *s)
2661 {
2662 int i, idx;
2663 long alg_k, alg_a;
2664 EVP_PKEY *pkey = NULL;
2665 SESS_CERT *sc;
2666 DH *dh;
2667
2668 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
2669 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
2670
2671 /* We don't have a certificate. */
2672 if (alg_a & SSL_aNULL)
2673 return (1);
2674
2675 sc = SSI(s)->sess_cert;
2676 if (sc == NULL) {
2677 SSLerror(s, ERR_R_INTERNAL_ERROR);
2678 goto err;
2679 }
2680 dh = SSI(s)->sess_cert->peer_dh_tmp;
2681
2682 /* This is the passed certificate. */
2683
2684 idx = sc->peer_cert_type;
2685 if (idx == SSL_PKEY_ECC) {
2686 if (ssl_check_srvr_ecc_cert_and_alg(
2687 sc->peer_pkeys[idx].x509, s) == 0) {
2688 /* check failed */
2689 SSLerror(s, SSL_R_BAD_ECC_CERT);
2690 goto f_err;
2691 } else {
2692 return (1);
2693 }
2694 }
2695 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
2696 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
2697 EVP_PKEY_free(pkey);
2698
2699 /* Check that we have a certificate if we require one. */
2700 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) {
2701 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT);
2702 goto f_err;
2703 }
2704 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) {
2705 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2706 goto f_err;
2707 }
2708 if ((alg_k & SSL_kDHE) &&
2709 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) {
2710 SSLerror(s, SSL_R_MISSING_DH_KEY);
2711 goto f_err;
2712 }
2713
2714 return (1);
2715 f_err:
2716 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2717 err:
2718 return (0);
2719 }
2720
2721 /*
2722 * Check to see if handshake is full or resumed. Usually this is just a
2723 * case of checking to see if a cache hit has occurred. In the case of
2724 * session tickets we have to check the next message to be sure.
2725 */
2726
2727 int
ssl3_check_finished(SSL * s)2728 ssl3_check_finished(SSL *s)
2729 {
2730 int ok;
2731 long n;
2732
2733 /* If we have no ticket it cannot be a resumed session. */
2734 if (!s->session->tlsext_tick)
2735 return (1);
2736 /* this function is called when we really expect a Certificate
2737 * message, so permit appropriate message length */
2738 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A,
2739 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok);
2740 if (!ok)
2741 return ((int)n);
2742
2743 S3I(s)->tmp.reuse_message = 1;
2744 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) ||
2745 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2746 return (2);
2747
2748 return (1);
2749 }
2750
2751 int
ssl_do_client_cert_cb(SSL * s,X509 ** px509,EVP_PKEY ** ppkey)2752 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2753 {
2754 int i = 0;
2755
2756 #ifndef OPENSSL_NO_ENGINE
2757 if (s->ctx->internal->client_cert_engine) {
2758 i = ENGINE_load_ssl_client_cert(
2759 s->ctx->internal->client_cert_engine, s,
2760 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL);
2761 if (i != 0)
2762 return (i);
2763 }
2764 #endif
2765 if (s->ctx->internal->client_cert_cb)
2766 i = s->ctx->internal->client_cert_cb(s, px509, ppkey);
2767 return (i);
2768 }
2769