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1/* $OpenBSD: ssl_srvr.c,v 1.156 2023/07/08 16:40:13 beck 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 <stdio.h>
153
154#include <openssl/bn.h>
155#include <openssl/buffer.h>
156#include <openssl/curve25519.h>
157#include <openssl/evp.h>
158#include <openssl/dh.h>
159#include <openssl/hmac.h>
160#include <openssl/md5.h>
161#include <openssl/objects.h>
162#include <openssl/opensslconf.h>
163#include <openssl/x509.h>
164
165#ifndef OPENSSL_NO_GOST
166#include <openssl/gost.h>
167#endif
168
169#include "bytestring.h"
170#include "dtls_local.h"
171#include "ssl_local.h"
172#include "ssl_sigalgs.h"
173#include "ssl_tlsext.h"
174
175static int ssl3_get_client_hello(SSL *s);
176static int ssl3_send_dtls_hello_verify_request(SSL *s);
177static int ssl3_send_server_hello(SSL *s);
178static int ssl3_send_hello_request(SSL *s);
179static int ssl3_send_server_certificate(SSL *s);
180static int ssl3_send_server_key_exchange(SSL *s);
181static int ssl3_send_certificate_request(SSL *s);
182static int ssl3_send_server_done(SSL *s);
183static int ssl3_get_client_certificate(SSL *s);
184static int ssl3_get_client_key_exchange(SSL *s);
185static int ssl3_get_cert_verify(SSL *s);
186static int ssl3_send_newsession_ticket(SSL *s);
187static int ssl3_send_cert_status(SSL *s);
188static int ssl3_send_server_change_cipher_spec(SSL *s);
189static int ssl3_send_server_finished(SSL *s);
190static int ssl3_get_client_finished(SSL *s);
191
192int
193ssl3_accept(SSL *s)
194{
195 unsigned long alg_k;
196 int new_state, state, skip = 0;
197 int listen = 0;
198 int ret = -1;
199
200 ERR_clear_error();
201 errno = 0;
202
203 if (SSL_is_dtls(s))
204 listen = s->d1->listen;
205
206 /* init things to blank */
207 s->in_handshake++;
208 if (!SSL_in_init(s) || SSL_in_before(s))
209 SSL_clear(s);
210
211 if (SSL_is_dtls(s))
212 s->d1->listen = listen;
213
214 for (;;) {
215 state = s->s3->hs.state;
216
217 switch (s->s3->hs.state) {
218 case SSL_ST_RENEGOTIATE:
219 s->renegotiate = 1;
220 /* s->s3->hs.state=SSL_ST_ACCEPT; */
221
222 case SSL_ST_BEFORE:
223 case SSL_ST_ACCEPT:
224 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
225 case SSL_ST_OK|SSL_ST_ACCEPT:
226 s->server = 1;
227
228 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1);
229
230 if (!ssl_legacy_stack_version(s, s->version)) {
231 SSLerror(s, ERR_R_INTERNAL_ERROR);
232 ret = -1;
233 goto end;
234 }
235
236 if (!ssl_supported_tls_version_range(s,
237 &s->s3->hs.our_min_tls_version,
238 &s->s3->hs.our_max_tls_version)) {
239 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE);
240 ret = -1;
241 goto end;
242 }
243
244 if (!ssl_security_version(s,
245 s->s3->hs.our_min_tls_version)) {
246 SSLerror(s, SSL_R_VERSION_TOO_LOW);
247 ret = -1;
248 goto end;
249 }
250
251 if (!ssl3_setup_init_buffer(s)) {
252 ret = -1;
253 goto end;
254 }
255 if (!ssl3_setup_buffers(s)) {
256 ret = -1;
257 goto end;
258 }
259
260 s->init_num = 0;
261
262 if (s->s3->hs.state != SSL_ST_RENEGOTIATE) {
263 /*
264 * Ok, we now need to push on a buffering BIO
265 * so that the output is sent in a way that
266 * TCP likes :-)
267 */
268 if (!ssl_init_wbio_buffer(s, 1)) {
269 ret = -1;
270 goto end;
271 }
272
273 if (!tls1_transcript_init(s)) {
274 ret = -1;
275 goto end;
276 }
277
278 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_A;
279 s->ctx->stats.sess_accept++;
280 } else if (!SSL_is_dtls(s) && !s->s3->send_connection_binding) {
281 /*
282 * Server attempting to renegotiate with
283 * client that doesn't support secure
284 * renegotiation.
285 */
286 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
287 ssl3_send_alert(s, SSL3_AL_FATAL,
288 SSL_AD_HANDSHAKE_FAILURE);
289 ret = -1;
290 goto end;
291 } else {
292 /*
293 * s->s3->hs.state == SSL_ST_RENEGOTIATE,
294 * we will just send a HelloRequest.
295 */
296 s->ctx->stats.sess_accept_renegotiate++;
297 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_A;
298 }
299 break;
300
301 case SSL3_ST_SW_HELLO_REQ_A:
302 case SSL3_ST_SW_HELLO_REQ_B:
303 s->shutdown = 0;
304 if (SSL_is_dtls(s)) {
305 dtls1_clear_record_buffer(s);
306 dtls1_start_timer(s);
307 }
308 ret = ssl3_send_hello_request(s);
309 if (ret <= 0)
310 goto end;
311 if (SSL_is_dtls(s))
312 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A;
313 else
314 s->s3->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C;
315 s->s3->hs.state = SSL3_ST_SW_FLUSH;
316 s->init_num = 0;
317
318 if (SSL_is_dtls(s)) {
319 if (!tls1_transcript_init(s)) {
320 ret = -1;
321 goto end;
322 }
323 }
324 break;
325
326 case SSL3_ST_SW_HELLO_REQ_C:
327 s->s3->hs.state = SSL_ST_OK;
328 break;
329
330 case SSL3_ST_SR_CLNT_HELLO_A:
331 case SSL3_ST_SR_CLNT_HELLO_B:
332 case SSL3_ST_SR_CLNT_HELLO_C:
333 s->shutdown = 0;
334 if (SSL_is_dtls(s)) {
335 ret = ssl3_get_client_hello(s);
336 if (ret <= 0)
337 goto end;
338 dtls1_stop_timer(s);
339
340 if (ret == 1 &&
341 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
342 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
343 else
344 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
345
346 s->init_num = 0;
347
348 /*
349 * Reflect ClientHello sequence to remain
350 * stateless while listening.
351 */
352 if (listen) {
353 tls12_record_layer_reflect_seq_num(
354 s->rl);
355 }
356
357 /* If we're just listening, stop here */
358 if (listen && s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
359 ret = 2;
360 s->d1->listen = 0;
361 /*
362 * Set expected sequence numbers to
363 * continue the handshake.
364 */
365 s->d1->handshake_read_seq = 2;
366 s->d1->handshake_write_seq = 1;
367 s->d1->next_handshake_write_seq = 1;
368 goto end;
369 }
370 } else {
371 if (s->rwstate != SSL_X509_LOOKUP) {
372 ret = ssl3_get_client_hello(s);
373 if (ret <= 0)
374 goto end;
375 }
376
377 s->renegotiate = 2;
378 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
379 s->init_num = 0;
380 }
381 break;
382
383 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
384 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
385 ret = ssl3_send_dtls_hello_verify_request(s);
386 if (ret <= 0)
387 goto end;
388 s->s3->hs.state = SSL3_ST_SW_FLUSH;
389 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A;
390
391 /* HelloVerifyRequest resets Finished MAC. */
392 tls1_transcript_reset(s);
393 break;
394
395 case SSL3_ST_SW_SRVR_HELLO_A:
396 case SSL3_ST_SW_SRVR_HELLO_B:
397 if (SSL_is_dtls(s)) {
398 s->renegotiate = 2;
399 dtls1_start_timer(s);
400 }
401 ret = ssl3_send_server_hello(s);
402 if (ret <= 0)
403 goto end;
404 if (s->hit) {
405 if (s->tlsext_ticket_expected)
406 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
407 else
408 s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
409 } else {
410 s->s3->hs.state = SSL3_ST_SW_CERT_A;
411 }
412 s->init_num = 0;
413 break;
414
415 case SSL3_ST_SW_CERT_A:
416 case SSL3_ST_SW_CERT_B:
417 /* Check if it is anon DH or anon ECDH. */
418 if (!(s->s3->hs.cipher->algorithm_auth &
419 SSL_aNULL)) {
420 if (SSL_is_dtls(s))
421 dtls1_start_timer(s);
422 ret = ssl3_send_server_certificate(s);
423 if (ret <= 0)
424 goto end;
425 if (s->tlsext_status_expected)
426 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_A;
427 else
428 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
429 } else {
430 skip = 1;
431 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
432 }
433 s->init_num = 0;
434 break;
435
436 case SSL3_ST_SW_KEY_EXCH_A:
437 case SSL3_ST_SW_KEY_EXCH_B:
438 alg_k = s->s3->hs.cipher->algorithm_mkey;
439
440 /*
441 * Only send if using a DH key exchange.
442 *
443 * For ECC ciphersuites, we send a ServerKeyExchange
444 * message only if the cipher suite is ECDHE. In other
445 * cases, the server certificate contains the server's
446 * public key for key exchange.
447 */
448 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
449 if (SSL_is_dtls(s))
450 dtls1_start_timer(s);
451 ret = ssl3_send_server_key_exchange(s);
452 if (ret <= 0)
453 goto end;
454 } else
455 skip = 1;
456
457 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_A;
458 s->init_num = 0;
459 break;
460
461 case SSL3_ST_SW_CERT_REQ_A:
462 case SSL3_ST_SW_CERT_REQ_B:
463 /*
464 * Determine whether or not we need to request a
465 * certificate.
466 *
467 * Do not request a certificate if:
468 *
469 * - We did not ask for it (SSL_VERIFY_PEER is unset).
470 *
471 * - SSL_VERIFY_CLIENT_ONCE is set and we are
472 * renegotiating.
473 *
474 * - We are using an anonymous ciphersuites
475 * (see section "Certificate request" in SSL 3 drafts
476 * and in RFC 2246) ... except when the application
477 * insists on verification (against the specs, but
478 * s3_clnt.c accepts this for SSL 3).
479 */
480 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
481 ((s->session->peer_cert != NULL) &&
482 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
483 ((s->s3->hs.cipher->algorithm_auth &
484 SSL_aNULL) && !(s->verify_mode &
485 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
486 /* No cert request. */
487 skip = 1;
488 s->s3->hs.tls12.cert_request = 0;
489 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A;
490
491 if (!SSL_is_dtls(s))
492 tls1_transcript_free(s);
493 } else {
494 s->s3->hs.tls12.cert_request = 1;
495 if (SSL_is_dtls(s))
496 dtls1_start_timer(s);
497 ret = ssl3_send_certificate_request(s);
498 if (ret <= 0)
499 goto end;
500 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A;
501 s->init_num = 0;
502 }
503 break;
504
505 case SSL3_ST_SW_SRVR_DONE_A:
506 case SSL3_ST_SW_SRVR_DONE_B:
507 if (SSL_is_dtls(s))
508 dtls1_start_timer(s);
509 ret = ssl3_send_server_done(s);
510 if (ret <= 0)
511 goto end;
512 s->s3->hs.tls12.next_state = SSL3_ST_SR_CERT_A;
513 s->s3->hs.state = SSL3_ST_SW_FLUSH;
514 s->init_num = 0;
515 break;
516
517 case SSL3_ST_SW_FLUSH:
518 /*
519 * This code originally checked to see if
520 * any data was pending using BIO_CTRL_INFO
521 * and then flushed. This caused problems
522 * as documented in PR#1939. The proposed
523 * fix doesn't completely resolve this issue
524 * as buggy implementations of BIO_CTRL_PENDING
525 * still exist. So instead we just flush
526 * unconditionally.
527 */
528 s->rwstate = SSL_WRITING;
529 if (BIO_flush(s->wbio) <= 0) {
530 if (SSL_is_dtls(s)) {
531 /* If the write error was fatal, stop trying. */
532 if (!BIO_should_retry(s->wbio)) {
533 s->rwstate = SSL_NOTHING;
534 s->s3->hs.state = s->s3->hs.tls12.next_state;
535 }
536 }
537 ret = -1;
538 goto end;
539 }
540 s->rwstate = SSL_NOTHING;
541 s->s3->hs.state = s->s3->hs.tls12.next_state;
542 break;
543
544 case SSL3_ST_SR_CERT_A:
545 case SSL3_ST_SR_CERT_B:
546 if (s->s3->hs.tls12.cert_request != 0) {
547 ret = ssl3_get_client_certificate(s);
548 if (ret <= 0)
549 goto end;
550 }
551 s->init_num = 0;
552 s->s3->hs.state = SSL3_ST_SR_KEY_EXCH_A;
553 break;
554
555 case SSL3_ST_SR_KEY_EXCH_A:
556 case SSL3_ST_SR_KEY_EXCH_B:
557 ret = ssl3_get_client_key_exchange(s);
558 if (ret <= 0)
559 goto end;
560
561 if (SSL_is_dtls(s)) {
562 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
563 s->init_num = 0;
564 }
565
566 alg_k = s->s3->hs.cipher->algorithm_mkey;
567 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
568 /*
569 * A GOST client may use the key from its
570 * certificate for key exchange, in which case
571 * the CertificateVerify message is not sent.
572 */
573 s->s3->hs.state = SSL3_ST_SR_FINISHED_A;
574 s->init_num = 0;
575 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) {
576 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
577 s->init_num = 0;
578 if (!s->session->peer_cert)
579 break;
580 /*
581 * Freeze the transcript for use during client
582 * certificate verification.
583 */
584 tls1_transcript_freeze(s);
585 } else {
586 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
587 s->init_num = 0;
588
589 tls1_transcript_free(s);
590
591 /*
592 * We need to get hashes here so if there is
593 * a client cert, it can be verified.
594 */
595 if (!tls1_transcript_hash_value(s,
596 s->s3->hs.tls12.cert_verify,
597 sizeof(s->s3->hs.tls12.cert_verify),
598 NULL)) {
599 ret = -1;
600 goto end;
601 }
602 }
603 break;
604
605 case SSL3_ST_SR_CERT_VRFY_A:
606 case SSL3_ST_SR_CERT_VRFY_B:
607 if (SSL_is_dtls(s))
608 s->d1->change_cipher_spec_ok = 1;
609 else
610 s->s3->flags |= SSL3_FLAGS_CCS_OK;
611
612 /* we should decide if we expected this one */
613 ret = ssl3_get_cert_verify(s);
614 if (ret <= 0)
615 goto end;
616 s->s3->hs.state = SSL3_ST_SR_FINISHED_A;
617 s->init_num = 0;
618 break;
619
620 case SSL3_ST_SR_FINISHED_A:
621 case SSL3_ST_SR_FINISHED_B:
622 if (SSL_is_dtls(s))
623 s->d1->change_cipher_spec_ok = 1;
624 else
625 s->s3->flags |= SSL3_FLAGS_CCS_OK;
626 ret = ssl3_get_client_finished(s);
627 if (ret <= 0)
628 goto end;
629 if (SSL_is_dtls(s))
630 dtls1_stop_timer(s);
631 if (s->hit)
632 s->s3->hs.state = SSL_ST_OK;
633 else if (s->tlsext_ticket_expected)
634 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
635 else
636 s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
637 s->init_num = 0;
638 break;
639
640 case SSL3_ST_SW_SESSION_TICKET_A:
641 case SSL3_ST_SW_SESSION_TICKET_B:
642 ret = ssl3_send_newsession_ticket(s);
643 if (ret <= 0)
644 goto end;
645 s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
646 s->init_num = 0;
647 break;
648
649 case SSL3_ST_SW_CERT_STATUS_A:
650 case SSL3_ST_SW_CERT_STATUS_B:
651 ret = ssl3_send_cert_status(s);
652 if (ret <= 0)
653 goto end;
654 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
655 s->init_num = 0;
656 break;
657
658 case SSL3_ST_SW_CHANGE_A:
659 case SSL3_ST_SW_CHANGE_B:
660 ret = ssl3_send_server_change_cipher_spec(s);
661 if (ret <= 0)
662 goto end;
663 s->s3->hs.state = SSL3_ST_SW_FINISHED_A;
664 s->init_num = 0;
665 s->session->cipher = s->s3->hs.cipher;
666
667 if (!tls1_setup_key_block(s)) {
668 ret = -1;
669 goto end;
670 }
671 if (!tls1_change_write_cipher_state(s)) {
672 ret = -1;
673 goto end;
674 }
675 break;
676
677 case SSL3_ST_SW_FINISHED_A:
678 case SSL3_ST_SW_FINISHED_B:
679 ret = ssl3_send_server_finished(s);
680 if (ret <= 0)
681 goto end;
682 s->s3->hs.state = SSL3_ST_SW_FLUSH;
683 if (s->hit) {
684 s->s3->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A;
685 tls1_transcript_free(s);
686 } else
687 s->s3->hs.tls12.next_state = SSL_ST_OK;
688 s->init_num = 0;
689 break;
690
691 case SSL_ST_OK:
692 /* clean a few things up */
693 tls1_cleanup_key_block(s);
694
695 if (s->s3->handshake_transcript != NULL) {
696 SSLerror(s, ERR_R_INTERNAL_ERROR);
697 ret = -1;
698 goto end;
699 }
700
701 if (!SSL_is_dtls(s))
702 ssl3_release_init_buffer(s);
703
704 /* remove buffering on output */
705 ssl_free_wbio_buffer(s);
706
707 s->init_num = 0;
708
709 /* Skipped if we just sent a HelloRequest. */
710 if (s->renegotiate == 2) {
711 s->renegotiate = 0;
712 s->new_session = 0;
713
714 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
715
716 s->ctx->stats.sess_accept_good++;
717 /* s->server=1; */
718 s->handshake_func = ssl3_accept;
719
720 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1);
721 }
722
723 ret = 1;
724
725 if (SSL_is_dtls(s)) {
726 /* Done handshaking, next message is client hello. */
727 s->d1->handshake_read_seq = 0;
728 /* Next message is server hello. */
729 s->d1->handshake_write_seq = 0;
730 s->d1->next_handshake_write_seq = 0;
731 }
732 goto end;
733 /* break; */
734
735 default:
736 SSLerror(s, SSL_R_UNKNOWN_STATE);
737 ret = -1;
738 goto end;
739 /* break; */
740 }
741
742 if (!s->s3->hs.tls12.reuse_message && !skip) {
743 if (s->debug) {
744 if ((ret = BIO_flush(s->wbio)) <= 0)
745 goto end;
746 }
747
748
749 if (s->s3->hs.state != state) {
750 new_state = s->s3->hs.state;
751 s->s3->hs.state = state;
752 ssl_info_callback(s, SSL_CB_ACCEPT_LOOP, 1);
753 s->s3->hs.state = new_state;
754 }
755 }
756 skip = 0;
757 }
758 end:
759 /* BIO_flush(s->wbio); */
760 s->in_handshake--;
761 ssl_info_callback(s, SSL_CB_ACCEPT_EXIT, ret);
762
763 return (ret);
764}
765
766static int
767ssl3_send_hello_request(SSL *s)
768{
769 CBB cbb, hello;
770
771 memset(&cbb, 0, sizeof(cbb));
772
773 if (s->s3->hs.state == SSL3_ST_SW_HELLO_REQ_A) {
774 if (!ssl3_handshake_msg_start(s, &cbb, &hello,
775 SSL3_MT_HELLO_REQUEST))
776 goto err;
777 if (!ssl3_handshake_msg_finish(s, &cbb))
778 goto err;
779
780 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_B;
781 }
782
783 /* SSL3_ST_SW_HELLO_REQ_B */
784 return (ssl3_handshake_write(s));
785
786 err:
787 CBB_cleanup(&cbb);
788
789 return (-1);
790}
791
792static int
793ssl3_get_client_hello(SSL *s)
794{
795 CBS cbs, client_random, session_id, cookie, cipher_suites;
796 CBS compression_methods;
797 uint16_t client_version;
798 uint8_t comp_method;
799 int comp_null;
800 int i, j, al, ret, cookie_valid = 0;
801 unsigned long id;
802 SSL_CIPHER *c;
803 STACK_OF(SSL_CIPHER) *ciphers = NULL;
804 unsigned long alg_k;
805 const SSL_METHOD *method;
806 uint16_t shared_version;
807
808 /*
809 * We do this so that we will respond with our native type.
810 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
811 * This down switching should be handled by a different method.
812 * If we are SSLv3, we will respond with SSLv3, even if prompted with
813 * TLSv1.
814 */
815 if (s->s3->hs.state == SSL3_ST_SR_CLNT_HELLO_A)
816 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_B;
817
818 s->first_packet = 1;
819 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B,
820 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO,
821 SSL3_RT_MAX_PLAIN_LENGTH)) <= 0)
822 return ret;
823 s->first_packet = 0;
824
825 ret = -1;
826
827 if (s->init_num < 0)
828 goto err;
829
830 CBS_init(&cbs, s->init_msg, s->init_num);
831
832 /* Parse client hello up until the extensions (if any). */
833 if (!CBS_get_u16(&cbs, &client_version))
834 goto decode_err;
835 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE))
836 goto decode_err;
837 if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
838 goto decode_err;
839 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) {
840 al = SSL_AD_ILLEGAL_PARAMETER;
841 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG);
842 goto fatal_err;
843 }
844 if (SSL_is_dtls(s)) {
845 if (!CBS_get_u8_length_prefixed(&cbs, &cookie))
846 goto decode_err;
847 }
848 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites))
849 goto decode_err;
850 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods))
851 goto decode_err;
852
853 /*
854 * Use version from inside client hello, not from record header.
855 * (may differ: see RFC 2246, Appendix E, second paragraph)
856 */
857 if (!ssl_max_shared_version(s, client_version, &shared_version)) {
858 if ((client_version >> 8) == SSL3_VERSION_MAJOR &&
859 !tls12_record_layer_write_protected(s->rl)) {
860 /*
861 * Similar to ssl3_get_record, send alert using remote
862 * version number.
863 */
864 s->version = client_version;
865 }
866 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER);
867 al = SSL_AD_PROTOCOL_VERSION;
868 goto fatal_err;
869 }
870 s->s3->hs.peer_legacy_version = client_version;
871 s->version = shared_version;
872
873 s->s3->hs.negotiated_tls_version = ssl_tls_version(shared_version);
874 if (s->s3->hs.negotiated_tls_version == 0) {
875 SSLerror(s, ERR_R_INTERNAL_ERROR);
876 goto err;
877 }
878
879 if ((method = ssl_get_method(shared_version)) == NULL) {
880 SSLerror(s, ERR_R_INTERNAL_ERROR);
881 goto err;
882 }
883 s->method = method;
884
885 /*
886 * If we require cookies (DTLS) and this ClientHello does not contain
887 * one, just return since we do not want to allocate any memory yet.
888 * So check cookie length...
889 */
890 if (SSL_is_dtls(s)) {
891 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
892 if (CBS_len(&cookie) == 0)
893 return (1);
894 }
895 }
896
897 if (!CBS_write_bytes(&client_random, s->s3->client_random,
898 sizeof(s->s3->client_random), NULL))
899 goto err;
900
901 s->hit = 0;
902
903 /*
904 * Versions before 0.9.7 always allow clients to resume sessions in
905 * renegotiation. 0.9.7 and later allow this by default, but optionally
906 * ignore resumption requests with flag
907 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag
908 * rather than a change to default behavior so that applications
909 * relying on this for security won't even compile against older
910 * library versions).
911 *
912 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated()
913 * to request renegotiation but not a new session (s->new_session
914 * remains unset): for servers, this essentially just means that the
915 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
916 * ignored.
917 */
918 if ((s->new_session && (s->options &
919 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
920 if (!ssl_get_new_session(s, 1))
921 goto err;
922 } else {
923 CBS ext_block;
924
925 CBS_dup(&cbs, &ext_block);
926
927 i = ssl_get_prev_session(s, &session_id, &ext_block, &al);
928 if (i == 1) { /* previous session */
929 s->hit = 1;
930 } else if (i == -1)
931 goto fatal_err;
932 else {
933 /* i == 0 */
934 if (!ssl_get_new_session(s, 1))
935 goto err;
936 }
937 }
938
939 if (SSL_is_dtls(s)) {
940 /*
941 * The ClientHello may contain a cookie even if the HelloVerify
942 * message has not been sent - make sure that it does not cause
943 * an overflow.
944 */
945 if (CBS_len(&cookie) > sizeof(s->d1->rcvd_cookie)) {
946 al = SSL_AD_DECODE_ERROR;
947 SSLerror(s, SSL_R_COOKIE_MISMATCH);
948 goto fatal_err;
949 }
950
951 /* Verify the cookie if appropriate option is set. */
952 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
953 CBS_len(&cookie) > 0) {
954 size_t cookie_len;
955
956 /* XXX - rcvd_cookie seems to only be used here... */
957 if (!CBS_write_bytes(&cookie, s->d1->rcvd_cookie,
958 sizeof(s->d1->rcvd_cookie), &cookie_len))
959 goto err;
960
961 if (s->ctx->app_verify_cookie_cb != NULL) {
962 if (s->ctx->app_verify_cookie_cb(s,
963 s->d1->rcvd_cookie, cookie_len) == 0) {
964 al = SSL_AD_HANDSHAKE_FAILURE;
965 SSLerror(s, SSL_R_COOKIE_MISMATCH);
966 goto fatal_err;
967 }
968 /* else cookie verification succeeded */
969 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */
970 } else if (timingsafe_memcmp(s->d1->rcvd_cookie,
971 s->d1->cookie, s->d1->cookie_len) != 0) {
972 /* default verification */
973 al = SSL_AD_HANDSHAKE_FAILURE;
974 SSLerror(s, SSL_R_COOKIE_MISMATCH);
975 goto fatal_err;
976 }
977 cookie_valid = 1;
978 }
979 }
980
981 /* XXX - This logic seems wrong... */
982 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) {
983 /* we need a cipher if we are not resuming a session */
984 al = SSL_AD_ILLEGAL_PARAMETER;
985 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED);
986 goto fatal_err;
987 }
988
989 if (CBS_len(&cipher_suites) > 0) {
990 if ((ciphers = ssl_bytes_to_cipher_list(s,
991 &cipher_suites)) == NULL)
992 goto err;
993 }
994
995 /* If it is a hit, check that the cipher is in the list */
996 /* XXX - CBS_len(&cipher_suites) will always be zero here... */
997 if (s->hit && CBS_len(&cipher_suites) > 0) {
998 j = 0;
999 id = s->session->cipher->id;
1000
1001 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1002 c = sk_SSL_CIPHER_value(ciphers, i);
1003 if (c->id == id) {
1004 j = 1;
1005 break;
1006 }
1007 }
1008 if (j == 0) {
1009 /*
1010 * We need to have the cipher in the cipher
1011 * list if we are asked to reuse it
1012 */
1013 al = SSL_AD_ILLEGAL_PARAMETER;
1014 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING);
1015 goto fatal_err;
1016 }
1017 }
1018
1019 comp_null = 0;
1020 while (CBS_len(&compression_methods) > 0) {
1021 if (!CBS_get_u8(&compression_methods, &comp_method))
1022 goto decode_err;
1023 if (comp_method == 0)
1024 comp_null = 1;
1025 }
1026 if (comp_null == 0) {
1027 al = SSL_AD_DECODE_ERROR;
1028 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED);
1029 goto fatal_err;
1030 }
1031
1032 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) {
1033 SSLerror(s, SSL_R_PARSE_TLSEXT);
1034 goto fatal_err;
1035 }
1036
1037 if (CBS_len(&cbs) != 0)
1038 goto decode_err;
1039
1040 if (!s->s3->renegotiate_seen && s->renegotiate) {
1041 al = SSL_AD_HANDSHAKE_FAILURE;
1042 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1043 goto fatal_err;
1044 }
1045
1046 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1047 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1048 goto err;
1049 }
1050
1051 /*
1052 * Check if we want to use external pre-shared secret for this
1053 * handshake for not reused session only. We need to generate
1054 * server_random before calling tls_session_secret_cb in order to allow
1055 * SessionTicket processing to use it in key derivation.
1056 */
1057 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE);
1058
1059 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION &&
1060 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) {
1061 /*
1062 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3
1063 * we must set the last 8 bytes of the server random to magical
1064 * values to indicate we meant to downgrade. For TLS 1.2 it is
1065 * recommended that we do the same.
1066 */
1067 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12);
1068 uint8_t *magic = &s->s3->server_random[index];
1069 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION) {
1070 /* Indicate we chose to downgrade to 1.2. */
1071 memcpy(magic, tls13_downgrade_12,
1072 sizeof(tls13_downgrade_12));
1073 } else {
1074 /* Indicate we chose to downgrade to 1.1 or lower */
1075 memcpy(magic, tls13_downgrade_11,
1076 sizeof(tls13_downgrade_11));
1077 }
1078 }
1079
1080 if (!s->hit && s->tls_session_secret_cb != NULL) {
1081 SSL_CIPHER *pref_cipher = NULL;
1082 int master_key_length = sizeof(s->session->master_key);
1083
1084 if (!s->tls_session_secret_cb(s,
1085 s->session->master_key, &master_key_length, ciphers,
1086 &pref_cipher, s->tls_session_secret_cb_arg)) {
1087 SSLerror(s, ERR_R_INTERNAL_ERROR);
1088 goto err;
1089 }
1090 if (master_key_length <= 0) {
1091 SSLerror(s, ERR_R_INTERNAL_ERROR);
1092 goto err;
1093 }
1094 s->session->master_key_length = master_key_length;
1095
1096 s->hit = 1;
1097 s->session->verify_result = X509_V_OK;
1098
1099 sk_SSL_CIPHER_free(s->session->ciphers);
1100 s->session->ciphers = ciphers;
1101 ciphers = NULL;
1102
1103 /* Check if some cipher was preferred by the callback. */
1104 if (pref_cipher == NULL)
1105 pref_cipher = ssl3_choose_cipher(s, s->session->ciphers,
1106 SSL_get_ciphers(s));
1107 if (pref_cipher == NULL) {
1108 al = SSL_AD_HANDSHAKE_FAILURE;
1109 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1110 goto fatal_err;
1111 }
1112 s->session->cipher = pref_cipher;
1113
1114 sk_SSL_CIPHER_free(s->cipher_list);
1115 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1116 }
1117
1118 /*
1119 * Given s->session->ciphers and SSL_get_ciphers, we must
1120 * pick a cipher
1121 */
1122
1123 if (!s->hit) {
1124 if (ciphers == NULL) {
1125 al = SSL_AD_ILLEGAL_PARAMETER;
1126 SSLerror(s, SSL_R_NO_CIPHERS_PASSED);
1127 goto fatal_err;
1128 }
1129 sk_SSL_CIPHER_free(s->session->ciphers);
1130 s->session->ciphers = ciphers;
1131 ciphers = NULL;
1132
1133 if ((c = ssl3_choose_cipher(s, s->session->ciphers,
1134 SSL_get_ciphers(s))) == NULL) {
1135 al = SSL_AD_HANDSHAKE_FAILURE;
1136 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1137 goto fatal_err;
1138 }
1139 s->s3->hs.cipher = c;
1140 } else {
1141 s->s3->hs.cipher = s->session->cipher;
1142 }
1143
1144 if (!tls1_transcript_hash_init(s))
1145 goto err;
1146
1147 alg_k = s->s3->hs.cipher->algorithm_mkey;
1148 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) ||
1149 !(s->verify_mode & SSL_VERIFY_PEER))
1150 tls1_transcript_free(s);
1151
1152 /*
1153 * We now have the following setup.
1154 * client_random
1155 * cipher_list - our preferred list of ciphers
1156 * ciphers - the clients preferred list of ciphers
1157 * compression - basically ignored right now
1158 * ssl version is set - sslv3
1159 * s->session - The ssl session has been setup.
1160 * s->hit - session reuse flag
1161 * s->hs.cipher - the new cipher to use.
1162 */
1163
1164 /* Handles TLS extensions that we couldn't check earlier */
1165 if (ssl_check_clienthello_tlsext_late(s) <= 0) {
1166 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1167 goto err;
1168 }
1169
1170 ret = cookie_valid ? 2 : 1;
1171
1172 if (0) {
1173 decode_err:
1174 al = SSL_AD_DECODE_ERROR;
1175 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1176 fatal_err:
1177 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1178 }
1179 err:
1180 sk_SSL_CIPHER_free(ciphers);
1181
1182 return (ret);
1183}
1184
1185static int
1186ssl3_send_dtls_hello_verify_request(SSL *s)
1187{
1188 CBB cbb, verify, cookie;
1189
1190 memset(&cbb, 0, sizeof(cbb));
1191
1192 if (s->s3->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
1193 if (s->ctx->app_gen_cookie_cb == NULL ||
1194 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
1195 &(s->d1->cookie_len)) == 0) {
1196 SSLerror(s, ERR_R_INTERNAL_ERROR);
1197 return 0;
1198 }
1199
1200 /*
1201 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should
1202 * always contain DTLSv1.0 regardless of the version that is
1203 * going to be negotiated.
1204 */
1205 if (!ssl3_handshake_msg_start(s, &cbb, &verify,
1206 DTLS1_MT_HELLO_VERIFY_REQUEST))
1207 goto err;
1208 if (!CBB_add_u16(&verify, DTLS1_VERSION))
1209 goto err;
1210 if (!CBB_add_u8_length_prefixed(&verify, &cookie))
1211 goto err;
1212 if (!CBB_add_bytes(&cookie, s->d1->cookie, s->d1->cookie_len))
1213 goto err;
1214 if (!ssl3_handshake_msg_finish(s, &cbb))
1215 goto err;
1216
1217 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
1218 }
1219
1220 /* s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
1221 return (ssl3_handshake_write(s));
1222
1223 err:
1224 CBB_cleanup(&cbb);
1225
1226 return (-1);
1227}
1228
1229static int
1230ssl3_send_server_hello(SSL *s)
1231{
1232 CBB cbb, server_hello, session_id;
1233 size_t sl;
1234
1235 memset(&cbb, 0, sizeof(cbb));
1236
1237 if (s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
1238 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello,
1239 SSL3_MT_SERVER_HELLO))
1240 goto err;
1241
1242 if (!CBB_add_u16(&server_hello, s->version))
1243 goto err;
1244 if (!CBB_add_bytes(&server_hello, s->s3->server_random,
1245 sizeof(s->s3->server_random)))
1246 goto err;
1247
1248 /*
1249 * There are several cases for the session ID to send
1250 * back in the server hello:
1251 *
1252 * - For session reuse from the session cache,
1253 * we send back the old session ID.
1254 * - If stateless session reuse (using a session ticket)
1255 * is successful, we send back the client's "session ID"
1256 * (which doesn't actually identify the session).
1257 * - If it is a new session, we send back the new
1258 * session ID.
1259 * - However, if we want the new session to be single-use,
1260 * we send back a 0-length session ID.
1261 *
1262 * s->hit is non-zero in either case of session reuse,
1263 * so the following won't overwrite an ID that we're supposed
1264 * to send back.
1265 */
1266 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1267 && !s->hit)
1268 s->session->session_id_length = 0;
1269
1270 sl = s->session->session_id_length;
1271 if (sl > sizeof(s->session->session_id)) {
1272 SSLerror(s, ERR_R_INTERNAL_ERROR);
1273 goto err;
1274 }
1275 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id))
1276 goto err;
1277 if (!CBB_add_bytes(&session_id, s->session->session_id, sl))
1278 goto err;
1279
1280 /* Cipher suite. */
1281 if (!CBB_add_u16(&server_hello,
1282 ssl3_cipher_get_value(s->s3->hs.cipher)))
1283 goto err;
1284
1285 /* Compression method (null). */
1286 if (!CBB_add_u8(&server_hello, 0))
1287 goto err;
1288
1289 /* TLS extensions */
1290 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) {
1291 SSLerror(s, ERR_R_INTERNAL_ERROR);
1292 goto err;
1293 }
1294
1295 if (!ssl3_handshake_msg_finish(s, &cbb))
1296 goto err;
1297 }
1298
1299 /* SSL3_ST_SW_SRVR_HELLO_B */
1300 return (ssl3_handshake_write(s));
1301
1302 err:
1303 CBB_cleanup(&cbb);
1304
1305 return (-1);
1306}
1307
1308static int
1309ssl3_send_server_done(SSL *s)
1310{
1311 CBB cbb, done;
1312
1313 memset(&cbb, 0, sizeof(cbb));
1314
1315 if (s->s3->hs.state == SSL3_ST_SW_SRVR_DONE_A) {
1316 if (!ssl3_handshake_msg_start(s, &cbb, &done,
1317 SSL3_MT_SERVER_DONE))
1318 goto err;
1319 if (!ssl3_handshake_msg_finish(s, &cbb))
1320 goto err;
1321
1322 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_B;
1323 }
1324
1325 /* SSL3_ST_SW_SRVR_DONE_B */
1326 return (ssl3_handshake_write(s));
1327
1328 err:
1329 CBB_cleanup(&cbb);
1330
1331 return (-1);
1332}
1333
1334static int
1335ssl3_send_server_kex_dhe(SSL *s, CBB *cbb)
1336{
1337 int nid = NID_dhKeyAgreement;
1338
1339 tls_key_share_free(s->s3->hs.key_share);
1340 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL)
1341 goto err;
1342
1343 if (s->cert->dhe_params_auto != 0) {
1344 size_t key_bits;
1345
1346 if ((key_bits = ssl_dhe_params_auto_key_bits(s)) == 0) {
1347 SSLerror(s, ERR_R_INTERNAL_ERROR);
1348 ssl3_send_alert(s, SSL3_AL_FATAL,
1349 SSL_AD_INTERNAL_ERROR);
1350 goto err;
1351 }
1352 tls_key_share_set_key_bits(s->s3->hs.key_share,
1353 key_bits);
1354 } else {
1355 DH *dh_params = s->cert->dhe_params;
1356
1357 if (dh_params == NULL && s->cert->dhe_params_cb != NULL)
1358 dh_params = s->cert->dhe_params_cb(s, 0,
1359 SSL_C_PKEYLENGTH(s->s3->hs.cipher));
1360
1361 if (dh_params == NULL) {
1362 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1363 ssl3_send_alert(s, SSL3_AL_FATAL,
1364 SSL_AD_HANDSHAKE_FAILURE);
1365 goto err;
1366 }
1367
1368 if (!tls_key_share_set_dh_params(s->s3->hs.key_share, dh_params))
1369 goto err;
1370 }
1371
1372 if (!tls_key_share_generate(s->s3->hs.key_share))
1373 goto err;
1374
1375 if (!tls_key_share_params(s->s3->hs.key_share, cbb))
1376 goto err;
1377 if (!tls_key_share_public(s->s3->hs.key_share, cbb))
1378 goto err;
1379
1380 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) {
1381 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL);
1382 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1383 return 0;
1384 }
1385
1386 return 1;
1387
1388 err:
1389 return 0;
1390}
1391
1392static int
1393ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb)
1394{
1395 CBB public;
1396 int nid;
1397
1398 if (!tls1_get_supported_group(s, &nid)) {
1399 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1400 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1401 goto err;
1402 }
1403
1404 tls_key_share_free(s->s3->hs.key_share);
1405 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL)
1406 goto err;
1407
1408 if (!tls_key_share_generate(s->s3->hs.key_share))
1409 goto err;
1410
1411 /*
1412 * ECC key exchange - see RFC 8422, section 5.4.
1413 */
1414 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
1415 goto err;
1416 if (!CBB_add_u16(cbb, tls_key_share_group(s->s3->hs.key_share)))
1417 goto err;
1418 if (!CBB_add_u8_length_prefixed(cbb, &public))
1419 goto err;
1420 if (!tls_key_share_public(s->s3->hs.key_share, &public))
1421 goto err;
1422 if (!CBB_flush(cbb))
1423 goto err;
1424
1425 return 1;
1426
1427 err:
1428 return 0;
1429}
1430
1431static int
1432ssl3_send_server_key_exchange(SSL *s)
1433{
1434 CBB cbb, cbb_signature, cbb_signed_params, server_kex;
1435 CBS params;
1436 const struct ssl_sigalg *sigalg = NULL;
1437 unsigned char *signed_params = NULL;
1438 size_t signed_params_len;
1439 unsigned char *signature = NULL;
1440 size_t signature_len = 0;
1441 const EVP_MD *md = NULL;
1442 unsigned long type;
1443 EVP_MD_CTX *md_ctx = NULL;
1444 EVP_PKEY_CTX *pctx;
1445 EVP_PKEY *pkey;
1446 int al;
1447
1448 memset(&cbb, 0, sizeof(cbb));
1449 memset(&cbb_signed_params, 0, sizeof(cbb_signed_params));
1450
1451 if ((md_ctx = EVP_MD_CTX_new()) == NULL)
1452 goto err;
1453
1454 if (s->s3->hs.state == SSL3_ST_SW_KEY_EXCH_A) {
1455
1456 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex,
1457 SSL3_MT_SERVER_KEY_EXCHANGE))
1458 goto err;
1459
1460 if (!CBB_init(&cbb_signed_params, 0))
1461 goto err;
1462
1463 if (!CBB_add_bytes(&cbb_signed_params, s->s3->client_random,
1464 SSL3_RANDOM_SIZE)) {
1465 SSLerror(s, ERR_R_INTERNAL_ERROR);
1466 goto err;
1467 }
1468 if (!CBB_add_bytes(&cbb_signed_params, s->s3->server_random,
1469 SSL3_RANDOM_SIZE)) {
1470 SSLerror(s, ERR_R_INTERNAL_ERROR);
1471 goto err;
1472 }
1473
1474 type = s->s3->hs.cipher->algorithm_mkey;
1475 if (type & SSL_kDHE) {
1476 if (!ssl3_send_server_kex_dhe(s, &cbb_signed_params))
1477 goto err;
1478 } else if (type & SSL_kECDHE) {
1479 if (!ssl3_send_server_kex_ecdhe(s, &cbb_signed_params))
1480 goto err;
1481 } else {
1482 al = SSL_AD_HANDSHAKE_FAILURE;
1483 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1484 goto fatal_err;
1485 }
1486
1487 if (!CBB_finish(&cbb_signed_params, &signed_params,
1488 &signed_params_len))
1489 goto err;
1490
1491 CBS_init(&params, signed_params, signed_params_len);
1492 if (!CBS_skip(&params, 2 * SSL3_RANDOM_SIZE))
1493 goto err;
1494
1495 if (!CBB_add_bytes(&server_kex, CBS_data(&params),
1496 CBS_len(&params)))
1497 goto err;
1498
1499 /* Add signature unless anonymous. */
1500 if (!(s->s3->hs.cipher->algorithm_auth & SSL_aNULL)) {
1501 if ((pkey = ssl_get_sign_pkey(s, s->s3->hs.cipher,
1502 &md, &sigalg)) == NULL) {
1503 al = SSL_AD_DECODE_ERROR;
1504 goto fatal_err;
1505 }
1506 s->s3->hs.our_sigalg = sigalg;
1507
1508 /* Send signature algorithm. */
1509 if (SSL_USE_SIGALGS(s)) {
1510 if (!CBB_add_u16(&server_kex, sigalg->value)) {
1511 al = SSL_AD_INTERNAL_ERROR;
1512 SSLerror(s, ERR_R_INTERNAL_ERROR);
1513 goto fatal_err;
1514 }
1515 }
1516
1517 if (!EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey)) {
1518 SSLerror(s, ERR_R_EVP_LIB);
1519 goto err;
1520 }
1521 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
1522 (!EVP_PKEY_CTX_set_rsa_padding(pctx,
1523 RSA_PKCS1_PSS_PADDING) ||
1524 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) {
1525 SSLerror(s, ERR_R_EVP_LIB);
1526 goto err;
1527 }
1528 if (!EVP_DigestSign(md_ctx, NULL, &signature_len,
1529 signed_params, signed_params_len)) {
1530 SSLerror(s, ERR_R_EVP_LIB);
1531 goto err;
1532 }
1533 if ((signature = calloc(1, signature_len)) == NULL) {
1534 SSLerror(s, ERR_R_MALLOC_FAILURE);
1535 goto err;
1536 }
1537 if (!EVP_DigestSign(md_ctx, signature, &signature_len,
1538 signed_params, signed_params_len)) {
1539 SSLerror(s, ERR_R_EVP_LIB);
1540 goto err;
1541 }
1542
1543 if (!CBB_add_u16_length_prefixed(&server_kex,
1544 &cbb_signature))
1545 goto err;
1546 if (!CBB_add_bytes(&cbb_signature, signature,
1547 signature_len))
1548 goto err;
1549 }
1550
1551 if (!ssl3_handshake_msg_finish(s, &cbb))
1552 goto err;
1553
1554 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_B;
1555 }
1556
1557 EVP_MD_CTX_free(md_ctx);
1558 free(signature);
1559 free(signed_params);
1560
1561 return (ssl3_handshake_write(s));
1562
1563 fatal_err:
1564 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1565 err:
1566 CBB_cleanup(&cbb_signed_params);
1567 CBB_cleanup(&cbb);
1568 EVP_MD_CTX_free(md_ctx);
1569 free(signature);
1570 free(signed_params);
1571
1572 return (-1);
1573}
1574
1575static int
1576ssl3_send_certificate_request(SSL *s)
1577{
1578 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn;
1579 STACK_OF(X509_NAME) *sk = NULL;
1580 X509_NAME *name;
1581 int i;
1582
1583 /*
1584 * Certificate Request - RFC 5246 section 7.4.4.
1585 */
1586
1587 memset(&cbb, 0, sizeof(cbb));
1588
1589 if (s->s3->hs.state == SSL3_ST_SW_CERT_REQ_A) {
1590 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request,
1591 SSL3_MT_CERTIFICATE_REQUEST))
1592 goto err;
1593
1594 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types))
1595 goto err;
1596 if (!ssl3_get_req_cert_types(s, &cert_types))
1597 goto err;
1598
1599 if (SSL_USE_SIGALGS(s)) {
1600 if (!CBB_add_u16_length_prefixed(&cert_request,
1601 &sigalgs))
1602 goto err;
1603 if (!ssl_sigalgs_build(s->s3->hs.negotiated_tls_version,
1604 &sigalgs, SSL_get_security_level(s)))
1605 goto err;
1606 }
1607
1608 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth))
1609 goto err;
1610
1611 sk = SSL_get_client_CA_list(s);
1612 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1613 unsigned char *name_data;
1614 size_t name_len;
1615
1616 name = sk_X509_NAME_value(sk, i);
1617 name_len = i2d_X509_NAME(name, NULL);
1618
1619 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn))
1620 goto err;
1621 if (!CBB_add_space(&dn, &name_data, name_len))
1622 goto err;
1623 if (i2d_X509_NAME(name, &name_data) != name_len)
1624 goto err;
1625 }
1626
1627 if (!ssl3_handshake_msg_finish(s, &cbb))
1628 goto err;
1629
1630 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_B;
1631 }
1632
1633 /* SSL3_ST_SW_CERT_REQ_B */
1634 return (ssl3_handshake_write(s));
1635
1636 err:
1637 CBB_cleanup(&cbb);
1638
1639 return (-1);
1640}
1641
1642static int
1643ssl3_get_client_kex_rsa(SSL *s, CBS *cbs)
1644{
1645 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH];
1646 unsigned char *pms = NULL;
1647 unsigned char *p;
1648 size_t pms_len = 0;
1649 EVP_PKEY *pkey = NULL;
1650 RSA *rsa = NULL;
1651 CBS enc_pms;
1652 int decrypt_len;
1653 int al = -1;
1654
1655 arc4random_buf(fakekey, sizeof(fakekey));
1656
1657 fakekey[0] = s->s3->hs.peer_legacy_version >> 8;
1658 fakekey[1] = s->s3->hs.peer_legacy_version & 0xff;
1659
1660 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey;
1661 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) {
1662 al = SSL_AD_HANDSHAKE_FAILURE;
1663 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE);
1664 goto fatal_err;
1665 }
1666
1667 pms_len = RSA_size(rsa);
1668 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH)
1669 goto err;
1670 if ((pms = malloc(pms_len)) == NULL)
1671 goto err;
1672 p = pms;
1673
1674 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms))
1675 goto decode_err;
1676 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) {
1677 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1678 goto err;
1679 }
1680
1681 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms),
1682 pms, rsa, RSA_PKCS1_PADDING);
1683
1684 ERR_clear_error();
1685
1686 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) {
1687 al = SSL_AD_DECODE_ERROR;
1688 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */
1689 }
1690
1691 if ((al == -1) && !((pms[0] == (s->s3->hs.peer_legacy_version >> 8)) &&
1692 (pms[1] == (s->s3->hs.peer_legacy_version & 0xff)))) {
1693 /*
1694 * The premaster secret must contain the same version number
1695 * as the ClientHello to detect version rollback attacks
1696 * (strangely, the protocol does not offer such protection for
1697 * DH ciphersuites).
1698 *
1699 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1700 * (http://eprint.iacr.org/2003/052/) exploits the version
1701 * number check as a "bad version oracle" -- an alert would
1702 * reveal that the plaintext corresponding to some ciphertext
1703 * made up by the adversary is properly formatted except that
1704 * the version number is wrong. To avoid such attacks, we should
1705 * treat this just like any other decryption error.
1706 */
1707 al = SSL_AD_DECODE_ERROR;
1708 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1709 }
1710
1711 if (al != -1) {
1712 /*
1713 * Some decryption failure -- use random value instead
1714 * as countermeasure against Bleichenbacher's attack
1715 * on PKCS #1 v1.5 RSA padding (see RFC 2246,
1716 * section 7.4.7.1).
1717 */
1718 p = fakekey;
1719 }
1720
1721 if (!tls12_derive_master_secret(s, p, SSL_MAX_MASTER_KEY_LENGTH))
1722 goto err;
1723
1724 freezero(pms, pms_len);
1725
1726 return 1;
1727
1728 decode_err:
1729 al = SSL_AD_DECODE_ERROR;
1730 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1731 fatal_err:
1732 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1733 err:
1734 freezero(pms, pms_len);
1735
1736 return 0;
1737}
1738
1739static int
1740ssl3_get_client_kex_dhe(SSL *s, CBS *cbs)
1741{
1742 uint8_t *key = NULL;
1743 size_t key_len = 0;
1744 int decode_error, invalid_key;
1745 int ret = 0;
1746
1747 if (s->s3->hs.key_share == NULL) {
1748 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1749 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1750 goto err;
1751 }
1752
1753 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs,
1754 &decode_error, &invalid_key)) {
1755 if (decode_error) {
1756 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1757 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1758 }
1759 goto err;
1760 }
1761 if (invalid_key) {
1762 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1763 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
1764 goto err;
1765 }
1766
1767 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len))
1768 goto err;
1769
1770 if (!tls12_derive_master_secret(s, key, key_len))
1771 goto err;
1772
1773 ret = 1;
1774
1775 err:
1776 freezero(key, key_len);
1777
1778 return ret;
1779}
1780
1781static int
1782ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs)
1783{
1784 uint8_t *key = NULL;
1785 size_t key_len = 0;
1786 int decode_error;
1787 CBS public;
1788 int ret = 0;
1789
1790 if (s->s3->hs.key_share == NULL) {
1791 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1792 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1793 goto err;
1794 }
1795
1796 if (!CBS_get_u8_length_prefixed(cbs, &public)) {
1797 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1798 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1799 goto err;
1800 }
1801 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public,
1802 &decode_error, NULL)) {
1803 if (decode_error) {
1804 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1805 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1806 }
1807 goto err;
1808 }
1809
1810 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len))
1811 goto err;
1812
1813 if (!tls12_derive_master_secret(s, key, key_len))
1814 goto err;
1815
1816 ret = 1;
1817
1818 err:
1819 freezero(key, key_len);
1820
1821 return ret;
1822}
1823
1824static int
1825ssl3_get_client_kex_gost(SSL *s, CBS *cbs)
1826{
1827 unsigned char premaster_secret[32];
1828 EVP_PKEY_CTX *pkey_ctx = NULL;
1829 EVP_PKEY *client_pubkey;
1830 EVP_PKEY *pkey = NULL;
1831 size_t outlen;
1832 CBS gostblob;
1833
1834 /* Get our certificate private key*/
1835#ifndef OPENSSL_NO_GOST
1836 if ((s->s3->hs.cipher->algorithm_auth & SSL_aGOST01) != 0)
1837 pkey = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
1838#endif
1839
1840 if ((pkey_ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL)
1841 goto err;
1842 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0)
1843 goto err;
1844
1845 /*
1846 * If client certificate is present and is of the same type,
1847 * maybe use it for key exchange.
1848 * Don't mind errors from EVP_PKEY_derive_set_peer, because
1849 * it is completely valid to use a client certificate for
1850 * authorization only.
1851 */
1852 if ((client_pubkey = X509_get0_pubkey(s->session->peer_cert)) != NULL) {
1853 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pubkey) <= 0)
1854 ERR_clear_error();
1855 }
1856
1857 /* Decrypt session key */
1858 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE))
1859 goto decode_err;
1860 if (CBS_len(cbs) != 0)
1861 goto decode_err;
1862 outlen = sizeof(premaster_secret);
1863 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen,
1864 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) {
1865 SSLerror(s, SSL_R_DECRYPTION_FAILED);
1866 goto err;
1867 }
1868
1869 if (!tls12_derive_master_secret(s, premaster_secret,
1870 sizeof(premaster_secret)))
1871 goto err;
1872
1873 /* Check if pubkey from client certificate was used */
1874 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY,
1875 2, NULL) > 0)
1876 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
1877
1878 explicit_bzero(premaster_secret, sizeof(premaster_secret));
1879 EVP_PKEY_CTX_free(pkey_ctx);
1880
1881 return 1;
1882
1883 decode_err:
1884 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1885 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1886 err:
1887 explicit_bzero(premaster_secret, sizeof(premaster_secret));
1888 EVP_PKEY_CTX_free(pkey_ctx);
1889
1890 return 0;
1891}
1892
1893static int
1894ssl3_get_client_key_exchange(SSL *s)
1895{
1896 unsigned long alg_k;
1897 int al, ret;
1898 CBS cbs;
1899
1900 /* 2048 maxlen is a guess. How long a key does that permit? */
1901 if ((ret = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A,
1902 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048)) <= 0)
1903 return ret;
1904
1905 if (s->init_num < 0)
1906 goto err;
1907
1908 CBS_init(&cbs, s->init_msg, s->init_num);
1909
1910 alg_k = s->s3->hs.cipher->algorithm_mkey;
1911
1912 if (alg_k & SSL_kRSA) {
1913 if (!ssl3_get_client_kex_rsa(s, &cbs))
1914 goto err;
1915 } else if (alg_k & SSL_kDHE) {
1916 if (!ssl3_get_client_kex_dhe(s, &cbs))
1917 goto err;
1918 } else if (alg_k & SSL_kECDHE) {
1919 if (!ssl3_get_client_kex_ecdhe(s, &cbs))
1920 goto err;
1921 } else if (alg_k & SSL_kGOST) {
1922 if (!ssl3_get_client_kex_gost(s, &cbs))
1923 goto err;
1924 } else {
1925 al = SSL_AD_HANDSHAKE_FAILURE;
1926 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE);
1927 goto fatal_err;
1928 }
1929
1930 if (CBS_len(&cbs) != 0) {
1931 al = SSL_AD_DECODE_ERROR;
1932 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1933 goto fatal_err;
1934 }
1935
1936 return (1);
1937
1938 fatal_err:
1939 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1940 err:
1941 return (-1);
1942}
1943
1944static int
1945ssl3_get_cert_verify(SSL *s)
1946{
1947 CBS cbs, signature;
1948 const struct ssl_sigalg *sigalg = NULL;
1949 uint16_t sigalg_value = SIGALG_NONE;
1950 EVP_PKEY *pkey;
1951 X509 *peer_cert = NULL;
1952 EVP_MD_CTX *mctx = NULL;
1953 int al, verify;
1954 const unsigned char *hdata;
1955 size_t hdatalen;
1956 int type = 0;
1957 int ret;
1958
1959 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A,
1960 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH)) <= 0)
1961 return ret;
1962
1963 ret = 0;
1964
1965 if (s->init_num < 0)
1966 goto err;
1967
1968 if ((mctx = EVP_MD_CTX_new()) == NULL)
1969 goto err;
1970
1971 CBS_init(&cbs, s->init_msg, s->init_num);
1972
1973 peer_cert = s->session->peer_cert;
1974 pkey = X509_get0_pubkey(peer_cert);
1975 type = X509_certificate_type(peer_cert, pkey);
1976
1977 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) {
1978 s->s3->hs.tls12.reuse_message = 1;
1979 if (peer_cert != NULL) {
1980 al = SSL_AD_UNEXPECTED_MESSAGE;
1981 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE);
1982 goto fatal_err;
1983 }
1984 ret = 1;
1985 goto end;
1986 }
1987
1988 if (peer_cert == NULL) {
1989 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED);
1990 al = SSL_AD_UNEXPECTED_MESSAGE;
1991 goto fatal_err;
1992 }
1993
1994 if (!(type & EVP_PKT_SIGN)) {
1995 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1996 al = SSL_AD_ILLEGAL_PARAMETER;
1997 goto fatal_err;
1998 }
1999
2000 if (s->s3->change_cipher_spec) {
2001 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY);
2002 al = SSL_AD_UNEXPECTED_MESSAGE;
2003 goto fatal_err;
2004 }
2005
2006 if (SSL_USE_SIGALGS(s)) {
2007 if (!CBS_get_u16(&cbs, &sigalg_value))
2008 goto decode_err;
2009 }
2010 if (!CBS_get_u16_length_prefixed(&cbs, &signature))
2011 goto err;
2012 if (CBS_len(&cbs) != 0) {
2013 al = SSL_AD_DECODE_ERROR;
2014 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE);
2015 goto fatal_err;
2016 }
2017
2018 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) {
2019 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE);
2020 al = SSL_AD_DECODE_ERROR;
2021 goto fatal_err;
2022 }
2023
2024 if ((sigalg = ssl_sigalg_for_peer(s, pkey,
2025 sigalg_value)) == NULL) {
2026 al = SSL_AD_DECODE_ERROR;
2027 goto fatal_err;
2028 }
2029 s->s3->hs.peer_sigalg = sigalg;
2030
2031 if (SSL_USE_SIGALGS(s)) {
2032 EVP_PKEY_CTX *pctx;
2033
2034 if (!tls1_transcript_data(s, &hdata, &hdatalen)) {
2035 SSLerror(s, ERR_R_INTERNAL_ERROR);
2036 al = SSL_AD_INTERNAL_ERROR;
2037 goto fatal_err;
2038 }
2039 if (!EVP_DigestVerifyInit(mctx, &pctx, sigalg->md(),
2040 NULL, pkey)) {
2041 SSLerror(s, ERR_R_EVP_LIB);
2042 al = SSL_AD_INTERNAL_ERROR;
2043 goto fatal_err;
2044 }
2045 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
2046 (!EVP_PKEY_CTX_set_rsa_padding(pctx,
2047 RSA_PKCS1_PSS_PADDING) ||
2048 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) {
2049 al = SSL_AD_INTERNAL_ERROR;
2050 goto fatal_err;
2051 }
2052#ifndef OPENSSL_NO_GOST
2053 if (sigalg->key_type == EVP_PKEY_GOSTR01 &&
2054 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
2055 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE,
2056 NULL) <= 0) {
2057 al = SSL_AD_INTERNAL_ERROR;
2058 goto fatal_err;
2059 }
2060#endif
2061 if (EVP_DigestVerify(mctx, CBS_data(&signature),
2062 CBS_len(&signature), hdata, hdatalen) <= 0) {
2063 SSLerror(s, ERR_R_EVP_LIB);
2064 al = SSL_AD_INTERNAL_ERROR;
2065 goto fatal_err;
2066 }
2067 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) {
2068 RSA *rsa;
2069
2070 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) {
2071 al = SSL_AD_INTERNAL_ERROR;
2072 SSLerror(s, ERR_R_EVP_LIB);
2073 goto fatal_err;
2074 }
2075 verify = RSA_verify(NID_md5_sha1, s->s3->hs.tls12.cert_verify,
2076 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature),
2077 CBS_len(&signature), rsa);
2078 if (verify < 0) {
2079 al = SSL_AD_DECRYPT_ERROR;
2080 SSLerror(s, SSL_R_BAD_RSA_DECRYPT);
2081 goto fatal_err;
2082 }
2083 if (verify == 0) {
2084 al = SSL_AD_DECRYPT_ERROR;
2085 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE);
2086 goto fatal_err;
2087 }
2088 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) {
2089 EC_KEY *eckey;
2090
2091 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) {
2092 al = SSL_AD_INTERNAL_ERROR;
2093 SSLerror(s, ERR_R_EVP_LIB);
2094 goto fatal_err;
2095 }
2096 verify = ECDSA_verify(0,
2097 &(s->s3->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]),
2098 SHA_DIGEST_LENGTH, CBS_data(&signature),
2099 CBS_len(&signature), eckey);
2100 if (verify <= 0) {
2101 al = SSL_AD_DECRYPT_ERROR;
2102 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE);
2103 goto fatal_err;
2104 }
2105#ifndef OPENSSL_NO_GOST
2106 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 ||
2107 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {
2108 unsigned char sigbuf[128];
2109 unsigned int siglen = sizeof(sigbuf);
2110 EVP_PKEY_CTX *pctx;
2111 const EVP_MD *md;
2112 int nid;
2113
2114 if (!tls1_transcript_data(s, &hdata, &hdatalen)) {
2115 SSLerror(s, ERR_R_INTERNAL_ERROR);
2116 al = SSL_AD_INTERNAL_ERROR;
2117 goto fatal_err;
2118 }
2119 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
2120 !(md = EVP_get_digestbynid(nid))) {
2121 SSLerror(s, ERR_R_EVP_LIB);
2122 al = SSL_AD_INTERNAL_ERROR;
2123 goto fatal_err;
2124 }
2125 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
2126 SSLerror(s, ERR_R_EVP_LIB);
2127 al = SSL_AD_INTERNAL_ERROR;
2128 goto fatal_err;
2129 }
2130 if (!EVP_DigestInit_ex(mctx, md, NULL) ||
2131 !EVP_DigestUpdate(mctx, hdata, hdatalen) ||
2132 !EVP_DigestFinal(mctx, sigbuf, &siglen) ||
2133 (EVP_PKEY_verify_init(pctx) <= 0) ||
2134 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) ||
2135 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
2136 EVP_PKEY_CTRL_GOST_SIG_FORMAT,
2137 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) {
2138 SSLerror(s, ERR_R_EVP_LIB);
2139 al = SSL_AD_INTERNAL_ERROR;
2140 EVP_PKEY_CTX_free(pctx);
2141 goto fatal_err;
2142 }
2143 if (EVP_PKEY_verify(pctx, CBS_data(&signature),
2144 CBS_len(&signature), sigbuf, siglen) <= 0) {
2145 al = SSL_AD_DECRYPT_ERROR;
2146 SSLerror(s, SSL_R_BAD_SIGNATURE);
2147 EVP_PKEY_CTX_free(pctx);
2148 goto fatal_err;
2149 }
2150
2151 EVP_PKEY_CTX_free(pctx);
2152#endif
2153 } else {
2154 SSLerror(s, ERR_R_INTERNAL_ERROR);
2155 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
2156 goto fatal_err;
2157 }
2158
2159 ret = 1;
2160 if (0) {
2161 decode_err:
2162 al = SSL_AD_DECODE_ERROR;
2163 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2164 fatal_err:
2165 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2166 }
2167 end:
2168 tls1_transcript_free(s);
2169 err:
2170 EVP_MD_CTX_free(mctx);
2171
2172 return (ret);
2173}
2174
2175static int
2176ssl3_get_client_certificate(SSL *s)
2177{
2178 CBS cbs, cert_list, cert_data;
2179 STACK_OF(X509) *certs = NULL;
2180 X509 *cert = NULL;
2181 const uint8_t *p;
2182 int al, ret;
2183
2184 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B,
2185 -1, s->max_cert_list)) <= 0)
2186 return ret;
2187
2188 ret = -1;
2189
2190 if (s->s3->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
2191 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2192 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2193 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2194 al = SSL_AD_HANDSHAKE_FAILURE;
2195 goto fatal_err;
2196 }
2197
2198 /*
2199 * If we asked for a client certificate and the client has none,
2200 * it must respond with a certificate list of length zero.
2201 */
2202 if (s->s3->hs.tls12.cert_request != 0) {
2203 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2204 al = SSL_AD_UNEXPECTED_MESSAGE;
2205 goto fatal_err;
2206 }
2207 s->s3->hs.tls12.reuse_message = 1;
2208 return (1);
2209 }
2210
2211 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) {
2212 al = SSL_AD_UNEXPECTED_MESSAGE;
2213 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE);
2214 goto fatal_err;
2215 }
2216
2217 if (s->init_num < 0)
2218 goto decode_err;
2219
2220 CBS_init(&cbs, s->init_msg, s->init_num);
2221
2222 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list))
2223 goto decode_err;
2224 if (CBS_len(&cbs) != 0)
2225 goto decode_err;
2226
2227 /*
2228 * A TLS client must send an empty certificate list, if no suitable
2229 * certificate is available (rather than omitting the Certificate
2230 * handshake message) - see RFC 5246 section 7.4.6.
2231 */
2232 if (CBS_len(&cert_list) == 0) {
2233 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2234 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2235 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2236 al = SSL_AD_HANDSHAKE_FAILURE;
2237 goto fatal_err;
2238 }
2239 /* No client certificate so free transcript. */
2240 tls1_transcript_free(s);
2241 goto done;
2242 }
2243
2244 if ((certs = sk_X509_new_null()) == NULL) {
2245 SSLerror(s, ERR_R_MALLOC_FAILURE);
2246 goto err;
2247 }
2248
2249 while (CBS_len(&cert_list) > 0) {
2250 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data))
2251 goto decode_err;
2252 p = CBS_data(&cert_data);
2253 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) {
2254 SSLerror(s, ERR_R_ASN1_LIB);
2255 goto err;
2256 }
2257 if (p != CBS_data(&cert_data) + CBS_len(&cert_data))
2258 goto decode_err;
2259 if (!sk_X509_push(certs, cert)) {
2260 SSLerror(s, ERR_R_MALLOC_FAILURE);
2261 goto err;
2262 }
2263 cert = NULL;
2264 }
2265
2266 if (ssl_verify_cert_chain(s, certs) <= 0) {
2267 al = ssl_verify_alarm_type(s->verify_result);
2268 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED);
2269 goto fatal_err;
2270 }
2271 s->session->verify_result = s->verify_result;
2272 ERR_clear_error();
2273
2274 if (!tls_process_peer_certs(s, certs))
2275 goto err;
2276
2277 done:
2278 ret = 1;
2279 if (0) {
2280 decode_err:
2281 al = SSL_AD_DECODE_ERROR;
2282 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2283 fatal_err:
2284 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2285 }
2286 err:
2287 sk_X509_pop_free(certs, X509_free);
2288 X509_free(cert);
2289
2290 return (ret);
2291}
2292
2293static int
2294ssl3_send_server_certificate(SSL *s)
2295{
2296 CBB cbb, server_cert;
2297 SSL_CERT_PKEY *cpk;
2298
2299 /*
2300 * Server Certificate - RFC 5246, section 7.4.2.
2301 */
2302
2303 memset(&cbb, 0, sizeof(cbb));
2304
2305 if (s->s3->hs.state == SSL3_ST_SW_CERT_A) {
2306 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) {
2307 SSLerror(s, ERR_R_INTERNAL_ERROR);
2308 return (0);
2309 }
2310
2311 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert,
2312 SSL3_MT_CERTIFICATE))
2313 goto err;
2314 if (!ssl3_output_cert_chain(s, &server_cert, cpk))
2315 goto err;
2316 if (!ssl3_handshake_msg_finish(s, &cbb))
2317 goto err;
2318
2319 s->s3->hs.state = SSL3_ST_SW_CERT_B;
2320 }
2321
2322 /* SSL3_ST_SW_CERT_B */
2323 return (ssl3_handshake_write(s));
2324
2325 err:
2326 CBB_cleanup(&cbb);
2327
2328 return (0);
2329}
2330
2331/* send a new session ticket (not necessarily for a new session) */
2332static int
2333ssl3_send_newsession_ticket(SSL *s)
2334{
2335 CBB cbb, session_ticket, ticket;
2336 SSL_CTX *tctx = s->initial_ctx;
2337 size_t enc_session_len, enc_session_max_len, hmac_len;
2338 size_t session_len = 0;
2339 unsigned char *enc_session = NULL, *session = NULL;
2340 unsigned char iv[EVP_MAX_IV_LENGTH];
2341 unsigned char key_name[16];
2342 unsigned char *hmac;
2343 unsigned int hlen;
2344 EVP_CIPHER_CTX *ctx = NULL;
2345 HMAC_CTX *hctx = NULL;
2346 int len;
2347
2348 /*
2349 * New Session Ticket - RFC 5077, section 3.3.
2350 */
2351
2352 memset(&cbb, 0, sizeof(cbb));
2353
2354 if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
2355 goto err;
2356 if ((hctx = HMAC_CTX_new()) == NULL)
2357 goto err;
2358
2359 if (s->s3->hs.state == SSL3_ST_SW_SESSION_TICKET_A) {
2360 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket,
2361 SSL3_MT_NEWSESSION_TICKET))
2362 goto err;
2363
2364 if (!SSL_SESSION_ticket(s->session, &session, &session_len))
2365 goto err;
2366 if (session_len > 0xffff)
2367 goto err;
2368
2369 /*
2370 * Initialize HMAC and cipher contexts. If callback is present
2371 * it does all the work, otherwise use generated values from
2372 * parent context.
2373 */
2374 if (tctx->tlsext_ticket_key_cb != NULL) {
2375 if (tctx->tlsext_ticket_key_cb(s,
2376 key_name, iv, ctx, hctx, 1) < 0)
2377 goto err;
2378 } else {
2379 arc4random_buf(iv, 16);
2380 EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL,
2381 tctx->tlsext_tick_aes_key, iv);
2382 HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key,
2383 16, EVP_sha256(), NULL);
2384 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
2385 }
2386
2387 /* Encrypt the session state. */
2388 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH;
2389 if ((enc_session = calloc(1, enc_session_max_len)) == NULL)
2390 goto err;
2391 enc_session_len = 0;
2392 if (!EVP_EncryptUpdate(ctx, enc_session, &len, session,
2393 session_len))
2394 goto err;
2395 enc_session_len += len;
2396 if (!EVP_EncryptFinal_ex(ctx, enc_session + enc_session_len,
2397 &len))
2398 goto err;
2399 enc_session_len += len;
2400
2401 if (enc_session_len > enc_session_max_len)
2402 goto err;
2403
2404 /* Generate the HMAC. */
2405 if (!HMAC_Update(hctx, key_name, sizeof(key_name)))
2406 goto err;
2407 if (!HMAC_Update(hctx, iv, EVP_CIPHER_CTX_iv_length(ctx)))
2408 goto err;
2409 if (!HMAC_Update(hctx, enc_session, enc_session_len))
2410 goto err;
2411
2412 if ((hmac_len = HMAC_size(hctx)) <= 0)
2413 goto err;
2414
2415 /*
2416 * Ticket lifetime hint (advisory only):
2417 * We leave this unspecified for resumed session
2418 * (for simplicity), and guess that tickets for new
2419 * sessions will live as long as their sessions.
2420 */
2421 if (!CBB_add_u32(&session_ticket,
2422 s->hit ? 0 : s->session->timeout))
2423 goto err;
2424
2425 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket))
2426 goto err;
2427 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name)))
2428 goto err;
2429 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(ctx)))
2430 goto err;
2431 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len))
2432 goto err;
2433 if (!CBB_add_space(&ticket, &hmac, hmac_len))
2434 goto err;
2435
2436 if (!HMAC_Final(hctx, hmac, &hlen))
2437 goto err;
2438 if (hlen != hmac_len)
2439 goto err;
2440
2441 if (!ssl3_handshake_msg_finish(s, &cbb))
2442 goto err;
2443
2444 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_B;
2445 }
2446
2447 EVP_CIPHER_CTX_free(ctx);
2448 HMAC_CTX_free(hctx);
2449 freezero(session, session_len);
2450 free(enc_session);
2451
2452 /* SSL3_ST_SW_SESSION_TICKET_B */
2453 return (ssl3_handshake_write(s));
2454
2455 err:
2456 CBB_cleanup(&cbb);
2457 EVP_CIPHER_CTX_free(ctx);
2458 HMAC_CTX_free(hctx);
2459 freezero(session, session_len);
2460 free(enc_session);
2461
2462 return (-1);
2463}
2464
2465static int
2466ssl3_send_cert_status(SSL *s)
2467{
2468 CBB cbb, certstatus, ocspresp;
2469
2470 memset(&cbb, 0, sizeof(cbb));
2471
2472 if (s->s3->hs.state == SSL3_ST_SW_CERT_STATUS_A) {
2473 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus,
2474 SSL3_MT_CERTIFICATE_STATUS))
2475 goto err;
2476 if (!CBB_add_u8(&certstatus, s->tlsext_status_type))
2477 goto err;
2478 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp))
2479 goto err;
2480 if (!CBB_add_bytes(&ocspresp, s->tlsext_ocsp_resp,
2481 s->tlsext_ocsp_resp_len))
2482 goto err;
2483 if (!ssl3_handshake_msg_finish(s, &cbb))
2484 goto err;
2485
2486 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_B;
2487 }
2488
2489 /* SSL3_ST_SW_CERT_STATUS_B */
2490 return (ssl3_handshake_write(s));
2491
2492 err:
2493 CBB_cleanup(&cbb);
2494
2495 return (-1);
2496}
2497
2498static int
2499ssl3_send_server_change_cipher_spec(SSL *s)
2500{
2501 size_t outlen;
2502 CBB cbb;
2503
2504 memset(&cbb, 0, sizeof(cbb));
2505
2506 if (s->s3->hs.state == SSL3_ST_SW_CHANGE_A) {
2507 if (!CBB_init_fixed(&cbb, s->init_buf->data,
2508 s->init_buf->length))
2509 goto err;
2510 if (!CBB_add_u8(&cbb, SSL3_MT_CCS))
2511 goto err;
2512 if (!CBB_finish(&cbb, NULL, &outlen))
2513 goto err;
2514
2515 if (outlen > INT_MAX)
2516 goto err;
2517
2518 s->init_num = (int)outlen;
2519 s->init_off = 0;
2520
2521 if (SSL_is_dtls(s)) {
2522 s->d1->handshake_write_seq =
2523 s->d1->next_handshake_write_seq;
2524 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
2525 s->d1->handshake_write_seq, 0, 0);
2526 dtls1_buffer_message(s, 1);
2527 }
2528
2529 s->s3->hs.state = SSL3_ST_SW_CHANGE_B;
2530 }
2531
2532 /* SSL3_ST_SW_CHANGE_B */
2533 return ssl3_record_write(s, SSL3_RT_CHANGE_CIPHER_SPEC);
2534
2535 err:
2536 CBB_cleanup(&cbb);
2537
2538 return -1;
2539}
2540
2541static int
2542ssl3_get_client_finished(SSL *s)
2543{
2544 int al, md_len, ret;
2545 CBS cbs;
2546
2547 /* should actually be 36+4 :-) */
2548 if ((ret = ssl3_get_message(s, SSL3_ST_SR_FINISHED_A,
2549 SSL3_ST_SR_FINISHED_B, SSL3_MT_FINISHED, 64)) <= 0)
2550 return ret;
2551
2552 /* If this occurs, we have missed a message */
2553 if (!s->s3->change_cipher_spec) {
2554 al = SSL_AD_UNEXPECTED_MESSAGE;
2555 SSLerror(s, SSL_R_GOT_A_FIN_BEFORE_A_CCS);
2556 goto fatal_err;
2557 }
2558 s->s3->change_cipher_spec = 0;
2559
2560 md_len = TLS1_FINISH_MAC_LENGTH;
2561
2562 if (s->init_num < 0) {
2563 al = SSL_AD_DECODE_ERROR;
2564 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH);
2565 goto fatal_err;
2566 }
2567
2568 CBS_init(&cbs, s->init_msg, s->init_num);
2569
2570 if (s->s3->hs.peer_finished_len != md_len ||
2571 CBS_len(&cbs) != md_len) {
2572 al = SSL_AD_DECODE_ERROR;
2573 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH);
2574 goto fatal_err;
2575 }
2576
2577 if (!CBS_mem_equal(&cbs, s->s3->hs.peer_finished, CBS_len(&cbs))) {
2578 al = SSL_AD_DECRYPT_ERROR;
2579 SSLerror(s, SSL_R_DIGEST_CHECK_FAILED);
2580 goto fatal_err;
2581 }
2582
2583 /* Copy finished so we can use it for renegotiation checks. */
2584 OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE);
2585 memcpy(s->s3->previous_client_finished,
2586 s->s3->hs.peer_finished, md_len);
2587 s->s3->previous_client_finished_len = md_len;
2588
2589 return (1);
2590 fatal_err:
2591 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2592 return (0);
2593}
2594
2595static int
2596ssl3_send_server_finished(SSL *s)
2597{
2598 CBB cbb, finished;
2599
2600 memset(&cbb, 0, sizeof(cbb));
2601
2602 if (s->s3->hs.state == SSL3_ST_SW_FINISHED_A) {
2603 if (!tls12_derive_finished(s))
2604 goto err;
2605
2606 /* Copy finished so we can use it for renegotiation checks. */
2607 memcpy(s->s3->previous_server_finished,
2608 s->s3->hs.finished, s->s3->hs.finished_len);
2609 s->s3->previous_server_finished_len = s->s3->hs.finished_len;
2610
2611 if (!ssl3_handshake_msg_start(s, &cbb, &finished,
2612 SSL3_MT_FINISHED))
2613 goto err;
2614 if (!CBB_add_bytes(&finished, s->s3->hs.finished,
2615 s->s3->hs.finished_len))
2616 goto err;
2617 if (!ssl3_handshake_msg_finish(s, &cbb))
2618 goto err;
2619
2620 s->s3->hs.state = SSL3_ST_SW_FINISHED_B;
2621 }
2622
2623 return (ssl3_handshake_write(s));
2624
2625 err:
2626 CBB_cleanup(&cbb);
2627
2628 return (-1);
2629}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-12 22:31:25 +0000