1 /* $OpenBSD: ssl_srvr.c,v 1.149 2022/08/17 07:39:19 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 <stdio.h>
152
153 #include <openssl/bn.h>
154 #include <openssl/buffer.h>
155 #include <openssl/curve25519.h>
156 #include <openssl/evp.h>
157 #include <openssl/dh.h>
158 #include <openssl/hmac.h>
159 #include <openssl/md5.h>
160 #include <openssl/objects.h>
161 #include <openssl/opensslconf.h>
162 #include <openssl/x509.h>
163
164 #ifndef OPENSSL_NO_GOST
165 #include <openssl/gost.h>
166 #endif
167
168 #include "bytestring.h"
169 #include "dtls_locl.h"
170 #include "ssl_locl.h"
171 #include "ssl_sigalgs.h"
172 #include "ssl_tlsext.h"
173
174 int
ssl3_accept(SSL * s)175 ssl3_accept(SSL *s)
176 {
177 unsigned long alg_k;
178 int new_state, state, skip = 0;
179 int listen = 0;
180 int ret = -1;
181
182 ERR_clear_error();
183 errno = 0;
184
185 if (SSL_is_dtls(s))
186 listen = s->d1->listen;
187
188 /* init things to blank */
189 s->internal->in_handshake++;
190 if (!SSL_in_init(s) || SSL_in_before(s))
191 SSL_clear(s);
192
193 if (SSL_is_dtls(s))
194 s->d1->listen = listen;
195
196 for (;;) {
197 state = s->s3->hs.state;
198
199 switch (s->s3->hs.state) {
200 case SSL_ST_RENEGOTIATE:
201 s->internal->renegotiate = 1;
202 /* s->s3->hs.state=SSL_ST_ACCEPT; */
203
204 case SSL_ST_BEFORE:
205 case SSL_ST_ACCEPT:
206 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
207 case SSL_ST_OK|SSL_ST_ACCEPT:
208 s->server = 1;
209
210 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1);
211
212 if (!ssl_legacy_stack_version(s, s->version)) {
213 SSLerror(s, ERR_R_INTERNAL_ERROR);
214 ret = -1;
215 goto end;
216 }
217
218 if (!ssl_supported_tls_version_range(s,
219 &s->s3->hs.our_min_tls_version,
220 &s->s3->hs.our_max_tls_version)) {
221 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE);
222 ret = -1;
223 goto end;
224 }
225
226 if (!ssl_security_version(s,
227 s->s3->hs.our_min_tls_version)) {
228 SSLerror(s, SSL_R_VERSION_TOO_LOW);
229 ret = -1;
230 goto end;
231 }
232
233 if (!ssl3_setup_init_buffer(s)) {
234 ret = -1;
235 goto end;
236 }
237 if (!ssl3_setup_buffers(s)) {
238 ret = -1;
239 goto end;
240 }
241
242 s->internal->init_num = 0;
243
244 if (s->s3->hs.state != SSL_ST_RENEGOTIATE) {
245 /*
246 * Ok, we now need to push on a buffering BIO
247 * so that the output is sent in a way that
248 * TCP likes :-)
249 */
250 if (!ssl_init_wbio_buffer(s, 1)) {
251 ret = -1;
252 goto end;
253 }
254
255 if (!tls1_transcript_init(s)) {
256 ret = -1;
257 goto end;
258 }
259
260 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_A;
261 s->ctx->internal->stats.sess_accept++;
262 } else if (!SSL_is_dtls(s) && !s->s3->send_connection_binding) {
263 /*
264 * Server attempting to renegotiate with
265 * client that doesn't support secure
266 * renegotiation.
267 */
268 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
269 ssl3_send_alert(s, SSL3_AL_FATAL,
270 SSL_AD_HANDSHAKE_FAILURE);
271 ret = -1;
272 goto end;
273 } else {
274 /*
275 * s->s3->hs.state == SSL_ST_RENEGOTIATE,
276 * we will just send a HelloRequest.
277 */
278 s->ctx->internal->stats.sess_accept_renegotiate++;
279 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_A;
280 }
281 break;
282
283 case SSL3_ST_SW_HELLO_REQ_A:
284 case SSL3_ST_SW_HELLO_REQ_B:
285 s->internal->shutdown = 0;
286 if (SSL_is_dtls(s)) {
287 dtls1_clear_record_buffer(s);
288 dtls1_start_timer(s);
289 }
290 ret = ssl3_send_hello_request(s);
291 if (ret <= 0)
292 goto end;
293 if (SSL_is_dtls(s))
294 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A;
295 else
296 s->s3->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C;
297 s->s3->hs.state = SSL3_ST_SW_FLUSH;
298 s->internal->init_num = 0;
299
300 if (SSL_is_dtls(s)) {
301 if (!tls1_transcript_init(s)) {
302 ret = -1;
303 goto end;
304 }
305 }
306 break;
307
308 case SSL3_ST_SW_HELLO_REQ_C:
309 s->s3->hs.state = SSL_ST_OK;
310 break;
311
312 case SSL3_ST_SR_CLNT_HELLO_A:
313 case SSL3_ST_SR_CLNT_HELLO_B:
314 case SSL3_ST_SR_CLNT_HELLO_C:
315 s->internal->shutdown = 0;
316 if (SSL_is_dtls(s)) {
317 ret = ssl3_get_client_hello(s);
318 if (ret <= 0)
319 goto end;
320 dtls1_stop_timer(s);
321
322 if (ret == 1 &&
323 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
324 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
325 else
326 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
327
328 s->internal->init_num = 0;
329
330 /*
331 * Reflect ClientHello sequence to remain
332 * stateless while listening.
333 */
334 if (listen) {
335 tls12_record_layer_reflect_seq_num(
336 s->internal->rl);
337 }
338
339 /* If we're just listening, stop here */
340 if (listen && s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
341 ret = 2;
342 s->d1->listen = 0;
343 /*
344 * Set expected sequence numbers to
345 * continue the handshake.
346 */
347 s->d1->handshake_read_seq = 2;
348 s->d1->handshake_write_seq = 1;
349 s->d1->next_handshake_write_seq = 1;
350 goto end;
351 }
352 } else {
353 if (s->internal->rwstate != SSL_X509_LOOKUP) {
354 ret = ssl3_get_client_hello(s);
355 if (ret <= 0)
356 goto end;
357 }
358
359 s->internal->renegotiate = 2;
360 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
361 s->internal->init_num = 0;
362 }
363 break;
364
365 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
366 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
367 ret = ssl3_send_dtls_hello_verify_request(s);
368 if (ret <= 0)
369 goto end;
370 s->s3->hs.state = SSL3_ST_SW_FLUSH;
371 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A;
372
373 /* HelloVerifyRequest resets Finished MAC. */
374 tls1_transcript_reset(s);
375 break;
376
377 case SSL3_ST_SW_SRVR_HELLO_A:
378 case SSL3_ST_SW_SRVR_HELLO_B:
379 if (SSL_is_dtls(s)) {
380 s->internal->renegotiate = 2;
381 dtls1_start_timer(s);
382 }
383 ret = ssl3_send_server_hello(s);
384 if (ret <= 0)
385 goto end;
386 if (s->internal->hit) {
387 if (s->internal->tlsext_ticket_expected)
388 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
389 else
390 s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
391 } else {
392 s->s3->hs.state = SSL3_ST_SW_CERT_A;
393 }
394 s->internal->init_num = 0;
395 break;
396
397 case SSL3_ST_SW_CERT_A:
398 case SSL3_ST_SW_CERT_B:
399 /* Check if it is anon DH or anon ECDH. */
400 if (!(s->s3->hs.cipher->algorithm_auth &
401 SSL_aNULL)) {
402 if (SSL_is_dtls(s))
403 dtls1_start_timer(s);
404 ret = ssl3_send_server_certificate(s);
405 if (ret <= 0)
406 goto end;
407 if (s->internal->tlsext_status_expected)
408 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_A;
409 else
410 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
411 } else {
412 skip = 1;
413 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
414 }
415 s->internal->init_num = 0;
416 break;
417
418 case SSL3_ST_SW_KEY_EXCH_A:
419 case SSL3_ST_SW_KEY_EXCH_B:
420 alg_k = s->s3->hs.cipher->algorithm_mkey;
421
422 /*
423 * Only send if using a DH key exchange.
424 *
425 * For ECC ciphersuites, we send a ServerKeyExchange
426 * message only if the cipher suite is ECDHE. In other
427 * cases, the server certificate contains the server's
428 * public key for key exchange.
429 */
430 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
431 if (SSL_is_dtls(s))
432 dtls1_start_timer(s);
433 ret = ssl3_send_server_key_exchange(s);
434 if (ret <= 0)
435 goto end;
436 } else
437 skip = 1;
438
439 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_A;
440 s->internal->init_num = 0;
441 break;
442
443 case SSL3_ST_SW_CERT_REQ_A:
444 case SSL3_ST_SW_CERT_REQ_B:
445 /*
446 * Determine whether or not we need to request a
447 * certificate.
448 *
449 * Do not request a certificate if:
450 *
451 * - We did not ask for it (SSL_VERIFY_PEER is unset).
452 *
453 * - SSL_VERIFY_CLIENT_ONCE is set and we are
454 * renegotiating.
455 *
456 * - We are using an anonymous ciphersuites
457 * (see section "Certificate request" in SSL 3 drafts
458 * and in RFC 2246) ... except when the application
459 * insists on verification (against the specs, but
460 * s3_clnt.c accepts this for SSL 3).
461 */
462 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
463 ((s->session->peer_cert != NULL) &&
464 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
465 ((s->s3->hs.cipher->algorithm_auth &
466 SSL_aNULL) && !(s->verify_mode &
467 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
468 /* No cert request. */
469 skip = 1;
470 s->s3->hs.tls12.cert_request = 0;
471 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A;
472
473 if (!SSL_is_dtls(s))
474 tls1_transcript_free(s);
475 } else {
476 s->s3->hs.tls12.cert_request = 1;
477 if (SSL_is_dtls(s))
478 dtls1_start_timer(s);
479 ret = ssl3_send_certificate_request(s);
480 if (ret <= 0)
481 goto end;
482 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A;
483 s->internal->init_num = 0;
484 }
485 break;
486
487 case SSL3_ST_SW_SRVR_DONE_A:
488 case SSL3_ST_SW_SRVR_DONE_B:
489 if (SSL_is_dtls(s))
490 dtls1_start_timer(s);
491 ret = ssl3_send_server_done(s);
492 if (ret <= 0)
493 goto end;
494 s->s3->hs.tls12.next_state = SSL3_ST_SR_CERT_A;
495 s->s3->hs.state = SSL3_ST_SW_FLUSH;
496 s->internal->init_num = 0;
497 break;
498
499 case SSL3_ST_SW_FLUSH:
500 /*
501 * This code originally checked to see if
502 * any data was pending using BIO_CTRL_INFO
503 * and then flushed. This caused problems
504 * as documented in PR#1939. The proposed
505 * fix doesn't completely resolve this issue
506 * as buggy implementations of BIO_CTRL_PENDING
507 * still exist. So instead we just flush
508 * unconditionally.
509 */
510 s->internal->rwstate = SSL_WRITING;
511 if (BIO_flush(s->wbio) <= 0) {
512 if (SSL_is_dtls(s)) {
513 /* If the write error was fatal, stop trying. */
514 if (!BIO_should_retry(s->wbio)) {
515 s->internal->rwstate = SSL_NOTHING;
516 s->s3->hs.state = s->s3->hs.tls12.next_state;
517 }
518 }
519 ret = -1;
520 goto end;
521 }
522 s->internal->rwstate = SSL_NOTHING;
523 s->s3->hs.state = s->s3->hs.tls12.next_state;
524 break;
525
526 case SSL3_ST_SR_CERT_A:
527 case SSL3_ST_SR_CERT_B:
528 if (s->s3->hs.tls12.cert_request != 0) {
529 ret = ssl3_get_client_certificate(s);
530 if (ret <= 0)
531 goto end;
532 }
533 s->internal->init_num = 0;
534 s->s3->hs.state = SSL3_ST_SR_KEY_EXCH_A;
535 break;
536
537 case SSL3_ST_SR_KEY_EXCH_A:
538 case SSL3_ST_SR_KEY_EXCH_B:
539 ret = ssl3_get_client_key_exchange(s);
540 if (ret <= 0)
541 goto end;
542
543 if (SSL_is_dtls(s)) {
544 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
545 s->internal->init_num = 0;
546 }
547
548 alg_k = s->s3->hs.cipher->algorithm_mkey;
549 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
550 /*
551 * A GOST client may use the key from its
552 * certificate for key exchange, in which case
553 * the CertificateVerify message is not sent.
554 */
555 s->s3->hs.state = SSL3_ST_SR_FINISHED_A;
556 s->internal->init_num = 0;
557 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) {
558 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
559 s->internal->init_num = 0;
560 if (!s->session->peer_cert)
561 break;
562 /*
563 * Freeze the transcript for use during client
564 * certificate verification.
565 */
566 tls1_transcript_freeze(s);
567 } else {
568 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
569 s->internal->init_num = 0;
570
571 tls1_transcript_free(s);
572
573 /*
574 * We need to get hashes here so if there is
575 * a client cert, it can be verified.
576 */
577 if (!tls1_transcript_hash_value(s,
578 s->s3->hs.tls12.cert_verify,
579 sizeof(s->s3->hs.tls12.cert_verify),
580 NULL)) {
581 ret = -1;
582 goto end;
583 }
584 }
585 break;
586
587 case SSL3_ST_SR_CERT_VRFY_A:
588 case SSL3_ST_SR_CERT_VRFY_B:
589 if (SSL_is_dtls(s))
590 s->d1->change_cipher_spec_ok = 1;
591 else
592 s->s3->flags |= SSL3_FLAGS_CCS_OK;
593
594 /* we should decide if we expected this one */
595 ret = ssl3_get_cert_verify(s);
596 if (ret <= 0)
597 goto end;
598 s->s3->hs.state = SSL3_ST_SR_FINISHED_A;
599 s->internal->init_num = 0;
600 break;
601
602 case SSL3_ST_SR_FINISHED_A:
603 case SSL3_ST_SR_FINISHED_B:
604 if (SSL_is_dtls(s))
605 s->d1->change_cipher_spec_ok = 1;
606 else
607 s->s3->flags |= SSL3_FLAGS_CCS_OK;
608 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
609 SSL3_ST_SR_FINISHED_B);
610 if (ret <= 0)
611 goto end;
612 if (SSL_is_dtls(s))
613 dtls1_stop_timer(s);
614 if (s->internal->hit)
615 s->s3->hs.state = SSL_ST_OK;
616 else if (s->internal->tlsext_ticket_expected)
617 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
618 else
619 s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
620 s->internal->init_num = 0;
621 break;
622
623 case SSL3_ST_SW_SESSION_TICKET_A:
624 case SSL3_ST_SW_SESSION_TICKET_B:
625 ret = ssl3_send_newsession_ticket(s);
626 if (ret <= 0)
627 goto end;
628 s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
629 s->internal->init_num = 0;
630 break;
631
632 case SSL3_ST_SW_CERT_STATUS_A:
633 case SSL3_ST_SW_CERT_STATUS_B:
634 ret = ssl3_send_cert_status(s);
635 if (ret <= 0)
636 goto end;
637 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
638 s->internal->init_num = 0;
639 break;
640
641 case SSL3_ST_SW_CHANGE_A:
642 case SSL3_ST_SW_CHANGE_B:
643 ret = ssl3_send_change_cipher_spec(s,
644 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B);
645 if (ret <= 0)
646 goto end;
647 s->s3->hs.state = SSL3_ST_SW_FINISHED_A;
648 s->internal->init_num = 0;
649 s->session->cipher = s->s3->hs.cipher;
650
651 if (!tls1_setup_key_block(s)) {
652 ret = -1;
653 goto end;
654 }
655 if (!tls1_change_write_cipher_state(s)) {
656 ret = -1;
657 goto end;
658 }
659 break;
660
661 case SSL3_ST_SW_FINISHED_A:
662 case SSL3_ST_SW_FINISHED_B:
663 ret = ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A,
664 SSL3_ST_SW_FINISHED_B);
665 if (ret <= 0)
666 goto end;
667 s->s3->hs.state = SSL3_ST_SW_FLUSH;
668 if (s->internal->hit) {
669 s->s3->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A;
670 tls1_transcript_free(s);
671 } else
672 s->s3->hs.tls12.next_state = SSL_ST_OK;
673 s->internal->init_num = 0;
674 break;
675
676 case SSL_ST_OK:
677 /* clean a few things up */
678 tls1_cleanup_key_block(s);
679
680 if (s->s3->handshake_transcript != NULL) {
681 SSLerror(s, ERR_R_INTERNAL_ERROR);
682 ret = -1;
683 goto end;
684 }
685
686 if (!SSL_is_dtls(s))
687 ssl3_release_init_buffer(s);
688
689 /* remove buffering on output */
690 ssl_free_wbio_buffer(s);
691
692 s->internal->init_num = 0;
693
694 /* Skipped if we just sent a HelloRequest. */
695 if (s->internal->renegotiate == 2) {
696 s->internal->renegotiate = 0;
697 s->internal->new_session = 0;
698
699 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
700
701 s->ctx->internal->stats.sess_accept_good++;
702 /* s->server=1; */
703 s->internal->handshake_func = ssl3_accept;
704
705 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1);
706 }
707
708 ret = 1;
709
710 if (SSL_is_dtls(s)) {
711 /* Done handshaking, next message is client hello. */
712 s->d1->handshake_read_seq = 0;
713 /* Next message is server hello. */
714 s->d1->handshake_write_seq = 0;
715 s->d1->next_handshake_write_seq = 0;
716 }
717 goto end;
718 /* break; */
719
720 default:
721 SSLerror(s, SSL_R_UNKNOWN_STATE);
722 ret = -1;
723 goto end;
724 /* break; */
725 }
726
727 if (!s->s3->hs.tls12.reuse_message && !skip) {
728 if (s->internal->debug) {
729 if ((ret = BIO_flush(s->wbio)) <= 0)
730 goto end;
731 }
732
733
734 if (s->s3->hs.state != state) {
735 new_state = s->s3->hs.state;
736 s->s3->hs.state = state;
737 ssl_info_callback(s, SSL_CB_ACCEPT_LOOP, 1);
738 s->s3->hs.state = new_state;
739 }
740 }
741 skip = 0;
742 }
743 end:
744 /* BIO_flush(s->wbio); */
745 s->internal->in_handshake--;
746 ssl_info_callback(s, SSL_CB_ACCEPT_EXIT, ret);
747
748 return (ret);
749 }
750
751 int
ssl3_send_hello_request(SSL * s)752 ssl3_send_hello_request(SSL *s)
753 {
754 CBB cbb, hello;
755
756 memset(&cbb, 0, sizeof(cbb));
757
758 if (s->s3->hs.state == SSL3_ST_SW_HELLO_REQ_A) {
759 if (!ssl3_handshake_msg_start(s, &cbb, &hello,
760 SSL3_MT_HELLO_REQUEST))
761 goto err;
762 if (!ssl3_handshake_msg_finish(s, &cbb))
763 goto err;
764
765 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_B;
766 }
767
768 /* SSL3_ST_SW_HELLO_REQ_B */
769 return (ssl3_handshake_write(s));
770
771 err:
772 CBB_cleanup(&cbb);
773
774 return (-1);
775 }
776
777 int
ssl3_get_client_hello(SSL * s)778 ssl3_get_client_hello(SSL *s)
779 {
780 CBS cbs, client_random, session_id, cookie, cipher_suites;
781 CBS compression_methods;
782 uint16_t client_version;
783 uint8_t comp_method;
784 int comp_null;
785 int i, j, al, ret, cookie_valid = 0;
786 unsigned long id;
787 SSL_CIPHER *c;
788 STACK_OF(SSL_CIPHER) *ciphers = NULL;
789 unsigned long alg_k;
790 const SSL_METHOD *method;
791 uint16_t shared_version;
792
793 /*
794 * We do this so that we will respond with our native type.
795 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
796 * This down switching should be handled by a different method.
797 * If we are SSLv3, we will respond with SSLv3, even if prompted with
798 * TLSv1.
799 */
800 if (s->s3->hs.state == SSL3_ST_SR_CLNT_HELLO_A)
801 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_B;
802
803 s->internal->first_packet = 1;
804 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B,
805 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO,
806 SSL3_RT_MAX_PLAIN_LENGTH)) <= 0)
807 return ret;
808 s->internal->first_packet = 0;
809
810 ret = -1;
811
812 if (s->internal->init_num < 0)
813 goto err;
814
815 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num);
816
817 /* Parse client hello up until the extensions (if any). */
818 if (!CBS_get_u16(&cbs, &client_version))
819 goto decode_err;
820 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE))
821 goto decode_err;
822 if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
823 goto decode_err;
824 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) {
825 al = SSL_AD_ILLEGAL_PARAMETER;
826 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG);
827 goto fatal_err;
828 }
829 if (SSL_is_dtls(s)) {
830 if (!CBS_get_u8_length_prefixed(&cbs, &cookie))
831 goto decode_err;
832 }
833 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites))
834 goto decode_err;
835 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods))
836 goto decode_err;
837
838 /*
839 * Use version from inside client hello, not from record header.
840 * (may differ: see RFC 2246, Appendix E, second paragraph)
841 */
842 if (!ssl_max_shared_version(s, client_version, &shared_version)) {
843 if ((client_version >> 8) == SSL3_VERSION_MAJOR &&
844 !tls12_record_layer_write_protected(s->internal->rl)) {
845 /*
846 * Similar to ssl3_get_record, send alert using remote
847 * version number.
848 */
849 s->version = client_version;
850 }
851 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER);
852 al = SSL_AD_PROTOCOL_VERSION;
853 goto fatal_err;
854 }
855 s->s3->hs.peer_legacy_version = client_version;
856 s->version = shared_version;
857
858 s->s3->hs.negotiated_tls_version = ssl_tls_version(shared_version);
859 if (s->s3->hs.negotiated_tls_version == 0) {
860 SSLerror(s, ERR_R_INTERNAL_ERROR);
861 goto err;
862 }
863
864 if ((method = ssl_get_method(shared_version)) == NULL) {
865 SSLerror(s, ERR_R_INTERNAL_ERROR);
866 goto err;
867 }
868 s->method = method;
869
870 /*
871 * If we require cookies (DTLS) and this ClientHello does not contain
872 * one, just return since we do not want to allocate any memory yet.
873 * So check cookie length...
874 */
875 if (SSL_is_dtls(s)) {
876 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
877 if (CBS_len(&cookie) == 0)
878 return (1);
879 }
880 }
881
882 if (!CBS_write_bytes(&client_random, s->s3->client_random,
883 sizeof(s->s3->client_random), NULL))
884 goto err;
885
886 s->internal->hit = 0;
887
888 /*
889 * Versions before 0.9.7 always allow clients to resume sessions in
890 * renegotiation. 0.9.7 and later allow this by default, but optionally
891 * ignore resumption requests with flag
892 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag
893 * rather than a change to default behavior so that applications
894 * relying on this for security won't even compile against older
895 * library versions).
896 *
897 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated()
898 * to request renegotiation but not a new session (s->internal->new_session
899 * remains unset): for servers, this essentially just means that the
900 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
901 * ignored.
902 */
903 if ((s->internal->new_session && (s->internal->options &
904 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
905 if (!ssl_get_new_session(s, 1))
906 goto err;
907 } else {
908 CBS ext_block;
909
910 CBS_dup(&cbs, &ext_block);
911
912 i = ssl_get_prev_session(s, &session_id, &ext_block, &al);
913 if (i == 1) { /* previous session */
914 s->internal->hit = 1;
915 } else if (i == -1)
916 goto fatal_err;
917 else {
918 /* i == 0 */
919 if (!ssl_get_new_session(s, 1))
920 goto err;
921 }
922 }
923
924 if (SSL_is_dtls(s)) {
925 /*
926 * The ClientHello may contain a cookie even if the HelloVerify
927 * message has not been sent - make sure that it does not cause
928 * an overflow.
929 */
930 if (CBS_len(&cookie) > sizeof(s->d1->rcvd_cookie)) {
931 al = SSL_AD_DECODE_ERROR;
932 SSLerror(s, SSL_R_COOKIE_MISMATCH);
933 goto fatal_err;
934 }
935
936 /* Verify the cookie if appropriate option is set. */
937 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
938 CBS_len(&cookie) > 0) {
939 size_t cookie_len;
940
941 /* XXX - rcvd_cookie seems to only be used here... */
942 if (!CBS_write_bytes(&cookie, s->d1->rcvd_cookie,
943 sizeof(s->d1->rcvd_cookie), &cookie_len))
944 goto err;
945
946 if (s->ctx->internal->app_verify_cookie_cb != NULL) {
947 if (s->ctx->internal->app_verify_cookie_cb(s,
948 s->d1->rcvd_cookie, cookie_len) == 0) {
949 al = SSL_AD_HANDSHAKE_FAILURE;
950 SSLerror(s, SSL_R_COOKIE_MISMATCH);
951 goto fatal_err;
952 }
953 /* else cookie verification succeeded */
954 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */
955 } else if (timingsafe_memcmp(s->d1->rcvd_cookie,
956 s->d1->cookie, s->d1->cookie_len) != 0) {
957 /* default verification */
958 al = SSL_AD_HANDSHAKE_FAILURE;
959 SSLerror(s, SSL_R_COOKIE_MISMATCH);
960 goto fatal_err;
961 }
962 cookie_valid = 1;
963 }
964 }
965
966 /* XXX - This logic seems wrong... */
967 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) {
968 /* we need a cipher if we are not resuming a session */
969 al = SSL_AD_ILLEGAL_PARAMETER;
970 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED);
971 goto fatal_err;
972 }
973
974 if (CBS_len(&cipher_suites) > 0) {
975 if ((ciphers = ssl_bytes_to_cipher_list(s,
976 &cipher_suites)) == NULL)
977 goto err;
978 }
979
980 /* If it is a hit, check that the cipher is in the list */
981 /* XXX - CBS_len(&cipher_suites) will always be zero here... */
982 if (s->internal->hit && CBS_len(&cipher_suites) > 0) {
983 j = 0;
984 id = s->session->cipher->id;
985
986 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
987 c = sk_SSL_CIPHER_value(ciphers, i);
988 if (c->id == id) {
989 j = 1;
990 break;
991 }
992 }
993 if (j == 0) {
994 /*
995 * We need to have the cipher in the cipher
996 * list if we are asked to reuse it
997 */
998 al = SSL_AD_ILLEGAL_PARAMETER;
999 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING);
1000 goto fatal_err;
1001 }
1002 }
1003
1004 comp_null = 0;
1005 while (CBS_len(&compression_methods) > 0) {
1006 if (!CBS_get_u8(&compression_methods, &comp_method))
1007 goto decode_err;
1008 if (comp_method == 0)
1009 comp_null = 1;
1010 }
1011 if (comp_null == 0) {
1012 al = SSL_AD_DECODE_ERROR;
1013 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED);
1014 goto fatal_err;
1015 }
1016
1017 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) {
1018 SSLerror(s, SSL_R_PARSE_TLSEXT);
1019 goto fatal_err;
1020 }
1021
1022 if (CBS_len(&cbs) != 0)
1023 goto decode_err;
1024
1025 if (!s->s3->renegotiate_seen && s->internal->renegotiate) {
1026 al = SSL_AD_HANDSHAKE_FAILURE;
1027 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1028 goto fatal_err;
1029 }
1030
1031 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1032 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1033 goto err;
1034 }
1035
1036 /*
1037 * Check if we want to use external pre-shared secret for this
1038 * handshake for not reused session only. We need to generate
1039 * server_random before calling tls_session_secret_cb in order to allow
1040 * SessionTicket processing to use it in key derivation.
1041 */
1042 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE);
1043
1044 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION &&
1045 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) {
1046 /*
1047 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3
1048 * we must set the last 8 bytes of the server random to magical
1049 * values to indicate we meant to downgrade. For TLS 1.2 it is
1050 * recommended that we do the same.
1051 */
1052 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12);
1053 uint8_t *magic = &s->s3->server_random[index];
1054 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION) {
1055 /* Indicate we chose to downgrade to 1.2. */
1056 memcpy(magic, tls13_downgrade_12,
1057 sizeof(tls13_downgrade_12));
1058 } else {
1059 /* Indicate we chose to downgrade to 1.1 or lower */
1060 memcpy(magic, tls13_downgrade_11,
1061 sizeof(tls13_downgrade_11));
1062 }
1063 }
1064
1065 if (!s->internal->hit && s->internal->tls_session_secret_cb != NULL) {
1066 SSL_CIPHER *pref_cipher = NULL;
1067 int master_key_length = sizeof(s->session->master_key);
1068
1069 if (!s->internal->tls_session_secret_cb(s,
1070 s->session->master_key, &master_key_length, ciphers,
1071 &pref_cipher, s->internal->tls_session_secret_cb_arg)) {
1072 SSLerror(s, ERR_R_INTERNAL_ERROR);
1073 goto err;
1074 }
1075 if (master_key_length <= 0) {
1076 SSLerror(s, ERR_R_INTERNAL_ERROR);
1077 goto err;
1078 }
1079 s->session->master_key_length = master_key_length;
1080
1081 s->internal->hit = 1;
1082 s->session->verify_result = X509_V_OK;
1083
1084 sk_SSL_CIPHER_free(s->session->ciphers);
1085 s->session->ciphers = ciphers;
1086 ciphers = NULL;
1087
1088 /* Check if some cipher was preferred by the callback. */
1089 if (pref_cipher == NULL)
1090 pref_cipher = ssl3_choose_cipher(s, s->session->ciphers,
1091 SSL_get_ciphers(s));
1092 if (pref_cipher == NULL) {
1093 al = SSL_AD_HANDSHAKE_FAILURE;
1094 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1095 goto fatal_err;
1096 }
1097 s->session->cipher = pref_cipher;
1098
1099 sk_SSL_CIPHER_free(s->cipher_list);
1100 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1101 }
1102
1103 /*
1104 * Given s->session->ciphers and SSL_get_ciphers, we must
1105 * pick a cipher
1106 */
1107
1108 if (!s->internal->hit) {
1109 if (ciphers == NULL) {
1110 al = SSL_AD_ILLEGAL_PARAMETER;
1111 SSLerror(s, SSL_R_NO_CIPHERS_PASSED);
1112 goto fatal_err;
1113 }
1114 sk_SSL_CIPHER_free(s->session->ciphers);
1115 s->session->ciphers = ciphers;
1116 ciphers = NULL;
1117
1118 if ((c = ssl3_choose_cipher(s, s->session->ciphers,
1119 SSL_get_ciphers(s))) == NULL) {
1120 al = SSL_AD_HANDSHAKE_FAILURE;
1121 SSLerror(s, SSL_R_NO_SHARED_CIPHER);
1122 goto fatal_err;
1123 }
1124 s->s3->hs.cipher = c;
1125 } else {
1126 s->s3->hs.cipher = s->session->cipher;
1127 }
1128
1129 if (!tls1_transcript_hash_init(s))
1130 goto err;
1131
1132 alg_k = s->s3->hs.cipher->algorithm_mkey;
1133 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) ||
1134 !(s->verify_mode & SSL_VERIFY_PEER))
1135 tls1_transcript_free(s);
1136
1137 /*
1138 * We now have the following setup.
1139 * client_random
1140 * cipher_list - our prefered list of ciphers
1141 * ciphers - the clients prefered list of ciphers
1142 * compression - basically ignored right now
1143 * ssl version is set - sslv3
1144 * s->session - The ssl session has been setup.
1145 * s->internal->hit - session reuse flag
1146 * s->hs.cipher - the new cipher to use.
1147 */
1148
1149 /* Handles TLS extensions that we couldn't check earlier */
1150 if (ssl_check_clienthello_tlsext_late(s) <= 0) {
1151 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT);
1152 goto err;
1153 }
1154
1155 ret = cookie_valid ? 2 : 1;
1156
1157 if (0) {
1158 decode_err:
1159 al = SSL_AD_DECODE_ERROR;
1160 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1161 fatal_err:
1162 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1163 }
1164 err:
1165 sk_SSL_CIPHER_free(ciphers);
1166
1167 return (ret);
1168 }
1169
1170 int
ssl3_send_dtls_hello_verify_request(SSL * s)1171 ssl3_send_dtls_hello_verify_request(SSL *s)
1172 {
1173 CBB cbb, verify, cookie;
1174
1175 memset(&cbb, 0, sizeof(cbb));
1176
1177 if (s->s3->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
1178 if (s->ctx->internal->app_gen_cookie_cb == NULL ||
1179 s->ctx->internal->app_gen_cookie_cb(s, s->d1->cookie,
1180 &(s->d1->cookie_len)) == 0) {
1181 SSLerror(s, ERR_R_INTERNAL_ERROR);
1182 return 0;
1183 }
1184
1185 /*
1186 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should
1187 * always contain DTLSv1.0 regardless of the version that is
1188 * going to be negotiated.
1189 */
1190 if (!ssl3_handshake_msg_start(s, &cbb, &verify,
1191 DTLS1_MT_HELLO_VERIFY_REQUEST))
1192 goto err;
1193 if (!CBB_add_u16(&verify, DTLS1_VERSION))
1194 goto err;
1195 if (!CBB_add_u8_length_prefixed(&verify, &cookie))
1196 goto err;
1197 if (!CBB_add_bytes(&cookie, s->d1->cookie, s->d1->cookie_len))
1198 goto err;
1199 if (!ssl3_handshake_msg_finish(s, &cbb))
1200 goto err;
1201
1202 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
1203 }
1204
1205 /* s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
1206 return (ssl3_handshake_write(s));
1207
1208 err:
1209 CBB_cleanup(&cbb);
1210
1211 return (-1);
1212 }
1213
1214 int
ssl3_send_server_hello(SSL * s)1215 ssl3_send_server_hello(SSL *s)
1216 {
1217 CBB cbb, server_hello, session_id;
1218 size_t sl;
1219
1220 memset(&cbb, 0, sizeof(cbb));
1221
1222 if (s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
1223 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello,
1224 SSL3_MT_SERVER_HELLO))
1225 goto err;
1226
1227 if (!CBB_add_u16(&server_hello, s->version))
1228 goto err;
1229 if (!CBB_add_bytes(&server_hello, s->s3->server_random,
1230 sizeof(s->s3->server_random)))
1231 goto err;
1232
1233 /*
1234 * There are several cases for the session ID to send
1235 * back in the server hello:
1236 *
1237 * - For session reuse from the session cache,
1238 * we send back the old session ID.
1239 * - If stateless session reuse (using a session ticket)
1240 * is successful, we send back the client's "session ID"
1241 * (which doesn't actually identify the session).
1242 * - If it is a new session, we send back the new
1243 * session ID.
1244 * - However, if we want the new session to be single-use,
1245 * we send back a 0-length session ID.
1246 *
1247 * s->internal->hit is non-zero in either case of session reuse,
1248 * so the following won't overwrite an ID that we're supposed
1249 * to send back.
1250 */
1251 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER)
1252 && !s->internal->hit)
1253 s->session->session_id_length = 0;
1254
1255 sl = s->session->session_id_length;
1256 if (sl > sizeof(s->session->session_id)) {
1257 SSLerror(s, ERR_R_INTERNAL_ERROR);
1258 goto err;
1259 }
1260 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id))
1261 goto err;
1262 if (!CBB_add_bytes(&session_id, s->session->session_id, sl))
1263 goto err;
1264
1265 /* Cipher suite. */
1266 if (!CBB_add_u16(&server_hello,
1267 ssl3_cipher_get_value(s->s3->hs.cipher)))
1268 goto err;
1269
1270 /* Compression method (null). */
1271 if (!CBB_add_u8(&server_hello, 0))
1272 goto err;
1273
1274 /* TLS extensions */
1275 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) {
1276 SSLerror(s, ERR_R_INTERNAL_ERROR);
1277 goto err;
1278 }
1279
1280 if (!ssl3_handshake_msg_finish(s, &cbb))
1281 goto err;
1282 }
1283
1284 /* SSL3_ST_SW_SRVR_HELLO_B */
1285 return (ssl3_handshake_write(s));
1286
1287 err:
1288 CBB_cleanup(&cbb);
1289
1290 return (-1);
1291 }
1292
1293 int
ssl3_send_server_done(SSL * s)1294 ssl3_send_server_done(SSL *s)
1295 {
1296 CBB cbb, done;
1297
1298 memset(&cbb, 0, sizeof(cbb));
1299
1300 if (s->s3->hs.state == SSL3_ST_SW_SRVR_DONE_A) {
1301 if (!ssl3_handshake_msg_start(s, &cbb, &done,
1302 SSL3_MT_SERVER_DONE))
1303 goto err;
1304 if (!ssl3_handshake_msg_finish(s, &cbb))
1305 goto err;
1306
1307 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_B;
1308 }
1309
1310 /* SSL3_ST_SW_SRVR_DONE_B */
1311 return (ssl3_handshake_write(s));
1312
1313 err:
1314 CBB_cleanup(&cbb);
1315
1316 return (-1);
1317 }
1318
1319 static int
ssl3_send_server_kex_dhe(SSL * s,CBB * cbb)1320 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb)
1321 {
1322 int nid = NID_dhKeyAgreement;
1323
1324 tls_key_share_free(s->s3->hs.key_share);
1325 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL)
1326 goto err;
1327
1328 if (s->cert->dhe_params_auto != 0) {
1329 size_t key_bits;
1330
1331 if ((key_bits = ssl_dhe_params_auto_key_bits(s)) == 0) {
1332 SSLerror(s, ERR_R_INTERNAL_ERROR);
1333 ssl3_send_alert(s, SSL3_AL_FATAL,
1334 SSL_AD_INTERNAL_ERROR);
1335 goto err;
1336 }
1337 tls_key_share_set_key_bits(s->s3->hs.key_share,
1338 key_bits);
1339 } else {
1340 DH *dh_params = s->cert->dhe_params;
1341
1342 if (dh_params == NULL && s->cert->dhe_params_cb != NULL)
1343 dh_params = s->cert->dhe_params_cb(s, 0,
1344 SSL_C_PKEYLENGTH(s->s3->hs.cipher));
1345
1346 if (dh_params == NULL) {
1347 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1348 ssl3_send_alert(s, SSL3_AL_FATAL,
1349 SSL_AD_HANDSHAKE_FAILURE);
1350 goto err;
1351 }
1352
1353 if (!tls_key_share_set_dh_params(s->s3->hs.key_share, dh_params))
1354 goto err;
1355 }
1356
1357 if (!tls_key_share_generate(s->s3->hs.key_share))
1358 goto err;
1359
1360 if (!tls_key_share_params(s->s3->hs.key_share, cbb))
1361 goto err;
1362 if (!tls_key_share_public(s->s3->hs.key_share, cbb))
1363 goto err;
1364
1365 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) {
1366 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL);
1367 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1368 return 0;
1369 }
1370
1371 return 1;
1372
1373 err:
1374 return 0;
1375 }
1376
1377 static int
ssl3_send_server_kex_ecdhe(SSL * s,CBB * cbb)1378 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb)
1379 {
1380 CBB public;
1381 int nid;
1382
1383 if (!tls1_get_supported_group(s, &nid)) {
1384 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1385 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1386 goto err;
1387 }
1388
1389 tls_key_share_free(s->s3->hs.key_share);
1390 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL)
1391 goto err;
1392
1393 if (!tls_key_share_generate(s->s3->hs.key_share))
1394 goto err;
1395
1396 /*
1397 * ECC key exchange - see RFC 8422, section 5.4.
1398 */
1399 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE))
1400 goto err;
1401 if (!CBB_add_u16(cbb, tls_key_share_group(s->s3->hs.key_share)))
1402 goto err;
1403 if (!CBB_add_u8_length_prefixed(cbb, &public))
1404 goto err;
1405 if (!tls_key_share_public(s->s3->hs.key_share, &public))
1406 goto err;
1407 if (!CBB_flush(cbb))
1408 goto err;
1409
1410 return 1;
1411
1412 err:
1413 return 0;
1414 }
1415
1416 int
ssl3_send_server_key_exchange(SSL * s)1417 ssl3_send_server_key_exchange(SSL *s)
1418 {
1419 CBB cbb, cbb_params, cbb_signature, server_kex;
1420 const struct ssl_sigalg *sigalg = NULL;
1421 unsigned char *signature = NULL;
1422 size_t signature_len = 0;
1423 unsigned char *params = NULL;
1424 size_t params_len;
1425 const EVP_MD *md = NULL;
1426 unsigned long type;
1427 EVP_MD_CTX *md_ctx = NULL;
1428 EVP_PKEY_CTX *pctx;
1429 EVP_PKEY *pkey;
1430 int al;
1431
1432 memset(&cbb, 0, sizeof(cbb));
1433 memset(&cbb_params, 0, sizeof(cbb_params));
1434
1435 if ((md_ctx = EVP_MD_CTX_new()) == NULL)
1436 goto err;
1437
1438 if (s->s3->hs.state == SSL3_ST_SW_KEY_EXCH_A) {
1439
1440 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex,
1441 SSL3_MT_SERVER_KEY_EXCHANGE))
1442 goto err;
1443
1444 if (!CBB_init(&cbb_params, 0))
1445 goto err;
1446
1447 type = s->s3->hs.cipher->algorithm_mkey;
1448 if (type & SSL_kDHE) {
1449 if (!ssl3_send_server_kex_dhe(s, &cbb_params))
1450 goto err;
1451 } else if (type & SSL_kECDHE) {
1452 if (!ssl3_send_server_kex_ecdhe(s, &cbb_params))
1453 goto err;
1454 } else {
1455 al = SSL_AD_HANDSHAKE_FAILURE;
1456 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1457 goto fatal_err;
1458 }
1459
1460 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len))
1461 goto err;
1462
1463 if (!CBB_add_bytes(&server_kex, params, params_len))
1464 goto err;
1465
1466 /* Add signature unless anonymous. */
1467 if (!(s->s3->hs.cipher->algorithm_auth & SSL_aNULL)) {
1468 if ((pkey = ssl_get_sign_pkey(s, s->s3->hs.cipher,
1469 &md, &sigalg)) == NULL) {
1470 al = SSL_AD_DECODE_ERROR;
1471 goto fatal_err;
1472 }
1473 s->s3->hs.our_sigalg = sigalg;
1474
1475 /* Send signature algorithm. */
1476 if (SSL_USE_SIGALGS(s)) {
1477 if (!CBB_add_u16(&server_kex, sigalg->value)) {
1478 al = SSL_AD_INTERNAL_ERROR;
1479 SSLerror(s, ERR_R_INTERNAL_ERROR);
1480 goto fatal_err;
1481 }
1482 }
1483
1484 if (!EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey)) {
1485 SSLerror(s, ERR_R_EVP_LIB);
1486 goto err;
1487 }
1488 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
1489 (!EVP_PKEY_CTX_set_rsa_padding(pctx,
1490 RSA_PKCS1_PSS_PADDING) ||
1491 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) {
1492 SSLerror(s, ERR_R_EVP_LIB);
1493 goto err;
1494 }
1495 if (!EVP_DigestSignUpdate(md_ctx, s->s3->client_random,
1496 SSL3_RANDOM_SIZE)) {
1497 SSLerror(s, ERR_R_EVP_LIB);
1498 goto err;
1499 }
1500 if (!EVP_DigestSignUpdate(md_ctx, s->s3->server_random,
1501 SSL3_RANDOM_SIZE)) {
1502 SSLerror(s, ERR_R_EVP_LIB);
1503 goto err;
1504 }
1505 if (!EVP_DigestSignUpdate(md_ctx, params, params_len)) {
1506 SSLerror(s, ERR_R_EVP_LIB);
1507 goto err;
1508 }
1509 if (!EVP_DigestSignFinal(md_ctx, NULL, &signature_len) ||
1510 !signature_len) {
1511 SSLerror(s, ERR_R_EVP_LIB);
1512 goto err;
1513 }
1514 if ((signature = calloc(1, signature_len)) == NULL) {
1515 SSLerror(s, ERR_R_MALLOC_FAILURE);
1516 goto err;
1517 }
1518 if (!EVP_DigestSignFinal(md_ctx, signature, &signature_len)) {
1519 SSLerror(s, ERR_R_EVP_LIB);
1520 goto err;
1521 }
1522
1523 if (!CBB_add_u16_length_prefixed(&server_kex,
1524 &cbb_signature))
1525 goto err;
1526 if (!CBB_add_bytes(&cbb_signature, signature,
1527 signature_len))
1528 goto err;
1529 }
1530
1531 if (!ssl3_handshake_msg_finish(s, &cbb))
1532 goto err;
1533
1534 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_B;
1535 }
1536
1537 EVP_MD_CTX_free(md_ctx);
1538 free(params);
1539 free(signature);
1540
1541 return (ssl3_handshake_write(s));
1542
1543 fatal_err:
1544 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1545 err:
1546 CBB_cleanup(&cbb_params);
1547 CBB_cleanup(&cbb);
1548 EVP_MD_CTX_free(md_ctx);
1549 free(params);
1550 free(signature);
1551
1552 return (-1);
1553 }
1554
1555 int
ssl3_send_certificate_request(SSL * s)1556 ssl3_send_certificate_request(SSL *s)
1557 {
1558 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn;
1559 STACK_OF(X509_NAME) *sk = NULL;
1560 X509_NAME *name;
1561 int i;
1562
1563 /*
1564 * Certificate Request - RFC 5246 section 7.4.4.
1565 */
1566
1567 memset(&cbb, 0, sizeof(cbb));
1568
1569 if (s->s3->hs.state == SSL3_ST_SW_CERT_REQ_A) {
1570 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request,
1571 SSL3_MT_CERTIFICATE_REQUEST))
1572 goto err;
1573
1574 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types))
1575 goto err;
1576 if (!ssl3_get_req_cert_types(s, &cert_types))
1577 goto err;
1578
1579 if (SSL_USE_SIGALGS(s)) {
1580 if (!CBB_add_u16_length_prefixed(&cert_request,
1581 &sigalgs))
1582 goto err;
1583 if (!ssl_sigalgs_build(s->s3->hs.negotiated_tls_version,
1584 &sigalgs, SSL_get_security_level(s)))
1585 goto err;
1586 }
1587
1588 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth))
1589 goto err;
1590
1591 sk = SSL_get_client_CA_list(s);
1592 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1593 unsigned char *name_data;
1594 size_t name_len;
1595
1596 name = sk_X509_NAME_value(sk, i);
1597 name_len = i2d_X509_NAME(name, NULL);
1598
1599 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn))
1600 goto err;
1601 if (!CBB_add_space(&dn, &name_data, name_len))
1602 goto err;
1603 if (i2d_X509_NAME(name, &name_data) != name_len)
1604 goto err;
1605 }
1606
1607 if (!ssl3_handshake_msg_finish(s, &cbb))
1608 goto err;
1609
1610 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_B;
1611 }
1612
1613 /* SSL3_ST_SW_CERT_REQ_B */
1614 return (ssl3_handshake_write(s));
1615
1616 err:
1617 CBB_cleanup(&cbb);
1618
1619 return (-1);
1620 }
1621
1622 static int
ssl3_get_client_kex_rsa(SSL * s,CBS * cbs)1623 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs)
1624 {
1625 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH];
1626 unsigned char *pms = NULL;
1627 unsigned char *p;
1628 size_t pms_len = 0;
1629 EVP_PKEY *pkey = NULL;
1630 RSA *rsa = NULL;
1631 CBS enc_pms;
1632 int decrypt_len;
1633 int al = -1;
1634
1635 arc4random_buf(fakekey, sizeof(fakekey));
1636
1637 fakekey[0] = s->s3->hs.peer_legacy_version >> 8;
1638 fakekey[1] = s->s3->hs.peer_legacy_version & 0xff;
1639
1640 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey;
1641 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) {
1642 al = SSL_AD_HANDSHAKE_FAILURE;
1643 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE);
1644 goto fatal_err;
1645 }
1646
1647 pms_len = RSA_size(rsa);
1648 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH)
1649 goto err;
1650 if ((pms = malloc(pms_len)) == NULL)
1651 goto err;
1652 p = pms;
1653
1654 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms))
1655 goto decode_err;
1656 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) {
1657 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1658 goto err;
1659 }
1660
1661 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms),
1662 pms, rsa, RSA_PKCS1_PADDING);
1663
1664 ERR_clear_error();
1665
1666 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) {
1667 al = SSL_AD_DECODE_ERROR;
1668 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */
1669 }
1670
1671 if ((al == -1) && !((pms[0] == (s->s3->hs.peer_legacy_version >> 8)) &&
1672 (pms[1] == (s->s3->hs.peer_legacy_version & 0xff)))) {
1673 /*
1674 * The premaster secret must contain the same version number
1675 * as the ClientHello to detect version rollback attacks
1676 * (strangely, the protocol does not offer such protection for
1677 * DH ciphersuites).
1678 *
1679 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1680 * (http://eprint.iacr.org/2003/052/) exploits the version
1681 * number check as a "bad version oracle" -- an alert would
1682 * reveal that the plaintext corresponding to some ciphertext
1683 * made up by the adversary is properly formatted except that
1684 * the version number is wrong. To avoid such attacks, we should
1685 * treat this just like any other decryption error.
1686 */
1687 al = SSL_AD_DECODE_ERROR;
1688 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1689 }
1690
1691 if (al != -1) {
1692 /*
1693 * Some decryption failure -- use random value instead
1694 * as countermeasure against Bleichenbacher's attack
1695 * on PKCS #1 v1.5 RSA padding (see RFC 2246,
1696 * section 7.4.7.1).
1697 */
1698 p = fakekey;
1699 }
1700
1701 if (!tls12_derive_master_secret(s, p, SSL_MAX_MASTER_KEY_LENGTH))
1702 goto err;
1703
1704 freezero(pms, pms_len);
1705
1706 return 1;
1707
1708 decode_err:
1709 al = SSL_AD_DECODE_ERROR;
1710 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1711 fatal_err:
1712 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1713 err:
1714 freezero(pms, pms_len);
1715
1716 return 0;
1717 }
1718
1719 static int
ssl3_get_client_kex_dhe(SSL * s,CBS * cbs)1720 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs)
1721 {
1722 uint8_t *key = NULL;
1723 size_t key_len = 0;
1724 int decode_error, invalid_key;
1725 int ret = 0;
1726
1727 if (s->s3->hs.key_share == NULL) {
1728 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1729 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1730 goto err;
1731 }
1732
1733 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs,
1734 &decode_error, &invalid_key)) {
1735 if (decode_error) {
1736 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1737 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1738 }
1739 goto err;
1740 }
1741 if (invalid_key) {
1742 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1743 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
1744 goto err;
1745 }
1746
1747 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len))
1748 goto err;
1749
1750 if (!tls12_derive_master_secret(s, key, key_len))
1751 goto err;
1752
1753 ret = 1;
1754
1755 err:
1756 freezero(key, key_len);
1757
1758 return ret;
1759 }
1760
1761 static int
ssl3_get_client_kex_ecdhe(SSL * s,CBS * cbs)1762 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs)
1763 {
1764 uint8_t *key = NULL;
1765 size_t key_len = 0;
1766 int decode_error;
1767 CBS public;
1768 int ret = 0;
1769
1770 if (s->s3->hs.key_share == NULL) {
1771 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1772 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY);
1773 goto err;
1774 }
1775
1776 if (!CBS_get_u8_length_prefixed(cbs, &public)) {
1777 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1778 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1779 goto err;
1780 }
1781 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public,
1782 &decode_error, NULL)) {
1783 if (decode_error) {
1784 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1785 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1786 }
1787 goto err;
1788 }
1789
1790 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len))
1791 goto err;
1792
1793 if (!tls12_derive_master_secret(s, key, key_len))
1794 goto err;
1795
1796 ret = 1;
1797
1798 err:
1799 freezero(key, key_len);
1800
1801 return ret;
1802 }
1803
1804 static int
ssl3_get_client_kex_gost(SSL * s,CBS * cbs)1805 ssl3_get_client_kex_gost(SSL *s, CBS *cbs)
1806 {
1807 unsigned char premaster_secret[32];
1808 EVP_PKEY_CTX *pkey_ctx = NULL;
1809 EVP_PKEY *client_pubkey;
1810 EVP_PKEY *pkey = NULL;
1811 size_t outlen;
1812 CBS gostblob;
1813
1814 /* Get our certificate private key*/
1815 if ((s->s3->hs.cipher->algorithm_auth & SSL_aGOST01) != 0)
1816 pkey = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
1817
1818 if ((pkey_ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL)
1819 goto err;
1820 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0)
1821 goto err;
1822
1823 /*
1824 * If client certificate is present and is of the same type,
1825 * maybe use it for key exchange.
1826 * Don't mind errors from EVP_PKEY_derive_set_peer, because
1827 * it is completely valid to use a client certificate for
1828 * authorization only.
1829 */
1830 if ((client_pubkey = X509_get0_pubkey(s->session->peer_cert)) != NULL) {
1831 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pubkey) <= 0)
1832 ERR_clear_error();
1833 }
1834
1835 /* Decrypt session key */
1836 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE))
1837 goto decode_err;
1838 if (CBS_len(cbs) != 0)
1839 goto decode_err;
1840 outlen = sizeof(premaster_secret);
1841 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen,
1842 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) {
1843 SSLerror(s, SSL_R_DECRYPTION_FAILED);
1844 goto err;
1845 }
1846
1847 if (!tls12_derive_master_secret(s, premaster_secret,
1848 sizeof(premaster_secret)))
1849 goto err;
1850
1851 /* Check if pubkey from client certificate was used */
1852 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY,
1853 2, NULL) > 0)
1854 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
1855
1856 explicit_bzero(premaster_secret, sizeof(premaster_secret));
1857 EVP_PKEY_CTX_free(pkey_ctx);
1858
1859 return 1;
1860
1861 decode_err:
1862 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1863 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1864 err:
1865 explicit_bzero(premaster_secret, sizeof(premaster_secret));
1866 EVP_PKEY_CTX_free(pkey_ctx);
1867
1868 return 0;
1869 }
1870
1871 int
ssl3_get_client_key_exchange(SSL * s)1872 ssl3_get_client_key_exchange(SSL *s)
1873 {
1874 unsigned long alg_k;
1875 int al, ret;
1876 CBS cbs;
1877
1878 /* 2048 maxlen is a guess. How long a key does that permit? */
1879 if ((ret = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A,
1880 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048)) <= 0)
1881 return ret;
1882
1883 if (s->internal->init_num < 0)
1884 goto err;
1885
1886 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num);
1887
1888 alg_k = s->s3->hs.cipher->algorithm_mkey;
1889
1890 if (alg_k & SSL_kRSA) {
1891 if (!ssl3_get_client_kex_rsa(s, &cbs))
1892 goto err;
1893 } else if (alg_k & SSL_kDHE) {
1894 if (!ssl3_get_client_kex_dhe(s, &cbs))
1895 goto err;
1896 } else if (alg_k & SSL_kECDHE) {
1897 if (!ssl3_get_client_kex_ecdhe(s, &cbs))
1898 goto err;
1899 } else if (alg_k & SSL_kGOST) {
1900 if (!ssl3_get_client_kex_gost(s, &cbs))
1901 goto err;
1902 } else {
1903 al = SSL_AD_HANDSHAKE_FAILURE;
1904 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE);
1905 goto fatal_err;
1906 }
1907
1908 if (CBS_len(&cbs) != 0) {
1909 al = SSL_AD_DECODE_ERROR;
1910 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1911 goto fatal_err;
1912 }
1913
1914 return (1);
1915
1916 fatal_err:
1917 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1918 err:
1919 return (-1);
1920 }
1921
1922 int
ssl3_get_cert_verify(SSL * s)1923 ssl3_get_cert_verify(SSL *s)
1924 {
1925 CBS cbs, signature;
1926 const struct ssl_sigalg *sigalg = NULL;
1927 uint16_t sigalg_value = SIGALG_NONE;
1928 EVP_PKEY *pkey;
1929 X509 *peer_cert = NULL;
1930 EVP_MD_CTX *mctx = NULL;
1931 int al, verify;
1932 const unsigned char *hdata;
1933 size_t hdatalen;
1934 int type = 0;
1935 int ret;
1936
1937 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A,
1938 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH)) <= 0)
1939 return ret;
1940
1941 ret = 0;
1942
1943 if (s->internal->init_num < 0)
1944 goto err;
1945
1946 if ((mctx = EVP_MD_CTX_new()) == NULL)
1947 goto err;
1948
1949 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num);
1950
1951 peer_cert = s->session->peer_cert;
1952 pkey = X509_get0_pubkey(peer_cert);
1953 type = X509_certificate_type(peer_cert, pkey);
1954
1955 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) {
1956 s->s3->hs.tls12.reuse_message = 1;
1957 if (peer_cert != NULL) {
1958 al = SSL_AD_UNEXPECTED_MESSAGE;
1959 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE);
1960 goto fatal_err;
1961 }
1962 ret = 1;
1963 goto end;
1964 }
1965
1966 if (peer_cert == NULL) {
1967 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED);
1968 al = SSL_AD_UNEXPECTED_MESSAGE;
1969 goto fatal_err;
1970 }
1971
1972 if (!(type & EVP_PKT_SIGN)) {
1973 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1974 al = SSL_AD_ILLEGAL_PARAMETER;
1975 goto fatal_err;
1976 }
1977
1978 if (s->s3->change_cipher_spec) {
1979 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY);
1980 al = SSL_AD_UNEXPECTED_MESSAGE;
1981 goto fatal_err;
1982 }
1983
1984 if (SSL_USE_SIGALGS(s)) {
1985 if (!CBS_get_u16(&cbs, &sigalg_value))
1986 goto decode_err;
1987 }
1988 if (!CBS_get_u16_length_prefixed(&cbs, &signature))
1989 goto err;
1990 if (CBS_len(&cbs) != 0) {
1991 al = SSL_AD_DECODE_ERROR;
1992 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE);
1993 goto fatal_err;
1994 }
1995
1996 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) {
1997 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE);
1998 al = SSL_AD_DECODE_ERROR;
1999 goto fatal_err;
2000 }
2001
2002 if ((sigalg = ssl_sigalg_for_peer(s, pkey,
2003 sigalg_value)) == NULL) {
2004 al = SSL_AD_DECODE_ERROR;
2005 goto fatal_err;
2006 }
2007 s->s3->hs.peer_sigalg = sigalg;
2008
2009 if (SSL_USE_SIGALGS(s)) {
2010 EVP_PKEY_CTX *pctx;
2011
2012 if (!tls1_transcript_data(s, &hdata, &hdatalen)) {
2013 SSLerror(s, ERR_R_INTERNAL_ERROR);
2014 al = SSL_AD_INTERNAL_ERROR;
2015 goto fatal_err;
2016 }
2017 if (!EVP_DigestVerifyInit(mctx, &pctx, sigalg->md(),
2018 NULL, pkey)) {
2019 SSLerror(s, ERR_R_EVP_LIB);
2020 al = SSL_AD_INTERNAL_ERROR;
2021 goto fatal_err;
2022 }
2023 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) &&
2024 (!EVP_PKEY_CTX_set_rsa_padding(pctx,
2025 RSA_PKCS1_PSS_PADDING) ||
2026 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) {
2027 al = SSL_AD_INTERNAL_ERROR;
2028 goto fatal_err;
2029 }
2030 if (sigalg->key_type == EVP_PKEY_GOSTR01 &&
2031 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
2032 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE,
2033 NULL) <= 0) {
2034 al = SSL_AD_INTERNAL_ERROR;
2035 goto fatal_err;
2036 }
2037 if (!EVP_DigestVerifyUpdate(mctx, hdata, hdatalen)) {
2038 SSLerror(s, ERR_R_EVP_LIB);
2039 al = SSL_AD_INTERNAL_ERROR;
2040 goto fatal_err;
2041 }
2042 if (EVP_DigestVerifyFinal(mctx, CBS_data(&signature),
2043 CBS_len(&signature)) <= 0) {
2044 al = SSL_AD_DECRYPT_ERROR;
2045 SSLerror(s, SSL_R_BAD_SIGNATURE);
2046 goto fatal_err;
2047 }
2048 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) {
2049 RSA *rsa;
2050
2051 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) {
2052 al = SSL_AD_INTERNAL_ERROR;
2053 SSLerror(s, ERR_R_EVP_LIB);
2054 goto fatal_err;
2055 }
2056 verify = RSA_verify(NID_md5_sha1, s->s3->hs.tls12.cert_verify,
2057 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature),
2058 CBS_len(&signature), rsa);
2059 if (verify < 0) {
2060 al = SSL_AD_DECRYPT_ERROR;
2061 SSLerror(s, SSL_R_BAD_RSA_DECRYPT);
2062 goto fatal_err;
2063 }
2064 if (verify == 0) {
2065 al = SSL_AD_DECRYPT_ERROR;
2066 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE);
2067 goto fatal_err;
2068 }
2069 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) {
2070 EC_KEY *eckey;
2071
2072 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) {
2073 al = SSL_AD_INTERNAL_ERROR;
2074 SSLerror(s, ERR_R_EVP_LIB);
2075 goto fatal_err;
2076 }
2077 verify = ECDSA_verify(0,
2078 &(s->s3->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]),
2079 SHA_DIGEST_LENGTH, CBS_data(&signature),
2080 CBS_len(&signature), eckey);
2081 if (verify <= 0) {
2082 al = SSL_AD_DECRYPT_ERROR;
2083 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE);
2084 goto fatal_err;
2085 }
2086 #ifndef OPENSSL_NO_GOST
2087 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 ||
2088 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {
2089 unsigned char sigbuf[128];
2090 unsigned int siglen = sizeof(sigbuf);
2091 EVP_PKEY_CTX *pctx;
2092 const EVP_MD *md;
2093 int nid;
2094
2095 if (!tls1_transcript_data(s, &hdata, &hdatalen)) {
2096 SSLerror(s, ERR_R_INTERNAL_ERROR);
2097 al = SSL_AD_INTERNAL_ERROR;
2098 goto fatal_err;
2099 }
2100 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
2101 !(md = EVP_get_digestbynid(nid))) {
2102 SSLerror(s, ERR_R_EVP_LIB);
2103 al = SSL_AD_INTERNAL_ERROR;
2104 goto fatal_err;
2105 }
2106 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) {
2107 SSLerror(s, ERR_R_EVP_LIB);
2108 al = SSL_AD_INTERNAL_ERROR;
2109 goto fatal_err;
2110 }
2111 if (!EVP_DigestInit_ex(mctx, md, NULL) ||
2112 !EVP_DigestUpdate(mctx, hdata, hdatalen) ||
2113 !EVP_DigestFinal(mctx, sigbuf, &siglen) ||
2114 (EVP_PKEY_verify_init(pctx) <= 0) ||
2115 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) ||
2116 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY,
2117 EVP_PKEY_CTRL_GOST_SIG_FORMAT,
2118 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) {
2119 SSLerror(s, ERR_R_EVP_LIB);
2120 al = SSL_AD_INTERNAL_ERROR;
2121 EVP_PKEY_CTX_free(pctx);
2122 goto fatal_err;
2123 }
2124 if (EVP_PKEY_verify(pctx, CBS_data(&signature),
2125 CBS_len(&signature), sigbuf, siglen) <= 0) {
2126 al = SSL_AD_DECRYPT_ERROR;
2127 SSLerror(s, SSL_R_BAD_SIGNATURE);
2128 EVP_PKEY_CTX_free(pctx);
2129 goto fatal_err;
2130 }
2131
2132 EVP_PKEY_CTX_free(pctx);
2133 #endif
2134 } else {
2135 SSLerror(s, ERR_R_INTERNAL_ERROR);
2136 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
2137 goto fatal_err;
2138 }
2139
2140 ret = 1;
2141 if (0) {
2142 decode_err:
2143 al = SSL_AD_DECODE_ERROR;
2144 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2145 fatal_err:
2146 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2147 }
2148 end:
2149 tls1_transcript_free(s);
2150 err:
2151 EVP_MD_CTX_free(mctx);
2152
2153 return (ret);
2154 }
2155
2156 int
ssl3_get_client_certificate(SSL * s)2157 ssl3_get_client_certificate(SSL *s)
2158 {
2159 CBS cbs, cert_list, cert_data;
2160 STACK_OF(X509) *certs = NULL;
2161 X509 *cert = NULL;
2162 const uint8_t *p;
2163 int al, ret;
2164
2165 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B,
2166 -1, s->internal->max_cert_list)) <= 0)
2167 return ret;
2168
2169 ret = -1;
2170
2171 if (s->s3->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
2172 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2173 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2174 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2175 al = SSL_AD_HANDSHAKE_FAILURE;
2176 goto fatal_err;
2177 }
2178
2179 /*
2180 * If we asked for a client certificate and the client has none,
2181 * it must respond with a certificate list of length zero.
2182 */
2183 if (s->s3->hs.tls12.cert_request != 0) {
2184 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2185 al = SSL_AD_UNEXPECTED_MESSAGE;
2186 goto fatal_err;
2187 }
2188 s->s3->hs.tls12.reuse_message = 1;
2189 return (1);
2190 }
2191
2192 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) {
2193 al = SSL_AD_UNEXPECTED_MESSAGE;
2194 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE);
2195 goto fatal_err;
2196 }
2197
2198 if (s->internal->init_num < 0)
2199 goto decode_err;
2200
2201 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num);
2202
2203 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list))
2204 goto decode_err;
2205 if (CBS_len(&cbs) != 0)
2206 goto decode_err;
2207
2208 /*
2209 * A TLS client must send an empty certificate list, if no suitable
2210 * certificate is available (rather than omitting the Certificate
2211 * handshake message) - see RFC 5246 section 7.4.6.
2212 */
2213 if (CBS_len(&cert_list) == 0) {
2214 if ((s->verify_mode & SSL_VERIFY_PEER) &&
2215 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2216 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2217 al = SSL_AD_HANDSHAKE_FAILURE;
2218 goto fatal_err;
2219 }
2220 /* No client certificate so free transcript. */
2221 tls1_transcript_free(s);
2222 goto done;
2223 }
2224
2225 if ((certs = sk_X509_new_null()) == NULL) {
2226 SSLerror(s, ERR_R_MALLOC_FAILURE);
2227 goto err;
2228 }
2229
2230 while (CBS_len(&cert_list) > 0) {
2231 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data))
2232 goto decode_err;
2233 p = CBS_data(&cert_data);
2234 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) {
2235 SSLerror(s, ERR_R_ASN1_LIB);
2236 goto err;
2237 }
2238 if (p != CBS_data(&cert_data) + CBS_len(&cert_data))
2239 goto decode_err;
2240 if (!sk_X509_push(certs, cert)) {
2241 SSLerror(s, ERR_R_MALLOC_FAILURE);
2242 goto err;
2243 }
2244 cert = NULL;
2245 }
2246
2247 if (ssl_verify_cert_chain(s, certs) <= 0) {
2248 al = ssl_verify_alarm_type(s->verify_result);
2249 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED);
2250 goto fatal_err;
2251 }
2252 s->session->verify_result = s->verify_result;
2253 ERR_clear_error();
2254
2255 if (!tls_process_peer_certs(s, certs))
2256 goto err;
2257
2258 done:
2259 ret = 1;
2260 if (0) {
2261 decode_err:
2262 al = SSL_AD_DECODE_ERROR;
2263 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
2264 fatal_err:
2265 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2266 }
2267 err:
2268 sk_X509_pop_free(certs, X509_free);
2269 X509_free(cert);
2270
2271 return (ret);
2272 }
2273
2274 int
ssl3_send_server_certificate(SSL * s)2275 ssl3_send_server_certificate(SSL *s)
2276 {
2277 CBB cbb, server_cert;
2278 SSL_CERT_PKEY *cpk;
2279
2280 /*
2281 * Server Certificate - RFC 5246, section 7.4.2.
2282 */
2283
2284 memset(&cbb, 0, sizeof(cbb));
2285
2286 if (s->s3->hs.state == SSL3_ST_SW_CERT_A) {
2287 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) {
2288 SSLerror(s, ERR_R_INTERNAL_ERROR);
2289 return (0);
2290 }
2291
2292 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert,
2293 SSL3_MT_CERTIFICATE))
2294 goto err;
2295 if (!ssl3_output_cert_chain(s, &server_cert, cpk))
2296 goto err;
2297 if (!ssl3_handshake_msg_finish(s, &cbb))
2298 goto err;
2299
2300 s->s3->hs.state = SSL3_ST_SW_CERT_B;
2301 }
2302
2303 /* SSL3_ST_SW_CERT_B */
2304 return (ssl3_handshake_write(s));
2305
2306 err:
2307 CBB_cleanup(&cbb);
2308
2309 return (0);
2310 }
2311
2312 /* send a new session ticket (not necessarily for a new session) */
2313 int
ssl3_send_newsession_ticket(SSL * s)2314 ssl3_send_newsession_ticket(SSL *s)
2315 {
2316 CBB cbb, session_ticket, ticket;
2317 SSL_CTX *tctx = s->initial_ctx;
2318 size_t enc_session_len, enc_session_max_len, hmac_len;
2319 size_t session_len = 0;
2320 unsigned char *enc_session = NULL, *session = NULL;
2321 unsigned char iv[EVP_MAX_IV_LENGTH];
2322 unsigned char key_name[16];
2323 unsigned char *hmac;
2324 unsigned int hlen;
2325 EVP_CIPHER_CTX *ctx = NULL;
2326 HMAC_CTX *hctx = NULL;
2327 int len;
2328
2329 /*
2330 * New Session Ticket - RFC 5077, section 3.3.
2331 */
2332
2333 memset(&cbb, 0, sizeof(cbb));
2334
2335 if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
2336 goto err;
2337 if ((hctx = HMAC_CTX_new()) == NULL)
2338 goto err;
2339
2340 if (s->s3->hs.state == SSL3_ST_SW_SESSION_TICKET_A) {
2341 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket,
2342 SSL3_MT_NEWSESSION_TICKET))
2343 goto err;
2344
2345 if (!SSL_SESSION_ticket(s->session, &session, &session_len))
2346 goto err;
2347 if (session_len > 0xffff)
2348 goto err;
2349
2350 /*
2351 * Initialize HMAC and cipher contexts. If callback is present
2352 * it does all the work, otherwise use generated values from
2353 * parent context.
2354 */
2355 if (tctx->internal->tlsext_ticket_key_cb != NULL) {
2356 if (tctx->internal->tlsext_ticket_key_cb(s,
2357 key_name, iv, ctx, hctx, 1) < 0)
2358 goto err;
2359 } else {
2360 arc4random_buf(iv, 16);
2361 EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL,
2362 tctx->internal->tlsext_tick_aes_key, iv);
2363 HMAC_Init_ex(hctx, tctx->internal->tlsext_tick_hmac_key,
2364 16, EVP_sha256(), NULL);
2365 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16);
2366 }
2367
2368 /* Encrypt the session state. */
2369 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH;
2370 if ((enc_session = calloc(1, enc_session_max_len)) == NULL)
2371 goto err;
2372 enc_session_len = 0;
2373 if (!EVP_EncryptUpdate(ctx, enc_session, &len, session,
2374 session_len))
2375 goto err;
2376 enc_session_len += len;
2377 if (!EVP_EncryptFinal_ex(ctx, enc_session + enc_session_len,
2378 &len))
2379 goto err;
2380 enc_session_len += len;
2381
2382 if (enc_session_len > enc_session_max_len)
2383 goto err;
2384
2385 /* Generate the HMAC. */
2386 if (!HMAC_Update(hctx, key_name, sizeof(key_name)))
2387 goto err;
2388 if (!HMAC_Update(hctx, iv, EVP_CIPHER_CTX_iv_length(ctx)))
2389 goto err;
2390 if (!HMAC_Update(hctx, enc_session, enc_session_len))
2391 goto err;
2392
2393 if ((hmac_len = HMAC_size(hctx)) <= 0)
2394 goto err;
2395
2396 /*
2397 * Ticket lifetime hint (advisory only):
2398 * We leave this unspecified for resumed session
2399 * (for simplicity), and guess that tickets for new
2400 * sessions will live as long as their sessions.
2401 */
2402 if (!CBB_add_u32(&session_ticket,
2403 s->internal->hit ? 0 : s->session->timeout))
2404 goto err;
2405
2406 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket))
2407 goto err;
2408 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name)))
2409 goto err;
2410 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(ctx)))
2411 goto err;
2412 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len))
2413 goto err;
2414 if (!CBB_add_space(&ticket, &hmac, hmac_len))
2415 goto err;
2416
2417 if (!HMAC_Final(hctx, hmac, &hlen))
2418 goto err;
2419 if (hlen != hmac_len)
2420 goto err;
2421
2422 if (!ssl3_handshake_msg_finish(s, &cbb))
2423 goto err;
2424
2425 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_B;
2426 }
2427
2428 EVP_CIPHER_CTX_free(ctx);
2429 HMAC_CTX_free(hctx);
2430 freezero(session, session_len);
2431 free(enc_session);
2432
2433 /* SSL3_ST_SW_SESSION_TICKET_B */
2434 return (ssl3_handshake_write(s));
2435
2436 err:
2437 CBB_cleanup(&cbb);
2438 EVP_CIPHER_CTX_free(ctx);
2439 HMAC_CTX_free(hctx);
2440 freezero(session, session_len);
2441 free(enc_session);
2442
2443 return (-1);
2444 }
2445
2446 int
ssl3_send_cert_status(SSL * s)2447 ssl3_send_cert_status(SSL *s)
2448 {
2449 CBB cbb, certstatus, ocspresp;
2450
2451 memset(&cbb, 0, sizeof(cbb));
2452
2453 if (s->s3->hs.state == SSL3_ST_SW_CERT_STATUS_A) {
2454 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus,
2455 SSL3_MT_CERTIFICATE_STATUS))
2456 goto err;
2457 if (!CBB_add_u8(&certstatus, s->tlsext_status_type))
2458 goto err;
2459 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp))
2460 goto err;
2461 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp,
2462 s->internal->tlsext_ocsp_resp_len))
2463 goto err;
2464 if (!ssl3_handshake_msg_finish(s, &cbb))
2465 goto err;
2466
2467 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_B;
2468 }
2469
2470 /* SSL3_ST_SW_CERT_STATUS_B */
2471 return (ssl3_handshake_write(s));
2472
2473 err:
2474 CBB_cleanup(&cbb);
2475
2476 return (-1);
2477 }
2478