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1/* $OpenBSD: ssl_clnt.c,v 1.1 2017/01/26 05:51:54 jsing Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111/* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124/* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
150
151#include <limits.h>
152#include <stdint.h>
153#include <stdio.h>
154
155#include "ssl_locl.h"
156
157#include <openssl/bn.h>
158#include <openssl/buffer.h>
159#include <openssl/curve25519.h>
160#include <openssl/dh.h>
161#include <openssl/evp.h>
162#include <openssl/md5.h>
163#include <openssl/objects.h>
164
165#ifndef OPENSSL_NO_ENGINE
166#include <openssl/engine.h>
167#endif
168#ifndef OPENSSL_NO_GOST
169#include <openssl/gost.h>
170#endif
171
172#include "bytestring.h"
173
174static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b);
175
176int
177ssl3_connect(SSL *s)
178{
179 void (*cb)(const SSL *ssl, int type, int val) = NULL;
180 int ret = -1;
181 int new_state, state, skip = 0;
182
183 ERR_clear_error();
184 errno = 0;
185
186 if (s->internal->info_callback != NULL)
187 cb = s->internal->info_callback;
188 else if (s->ctx->internal->info_callback != NULL)
189 cb = s->ctx->internal->info_callback;
190
191 s->internal->in_handshake++;
192 if (!SSL_in_init(s) || SSL_in_before(s))
193 SSL_clear(s);
194
195 for (;;) {
196 state = s->internal->state;
197
198 switch (s->internal->state) {
199 case SSL_ST_RENEGOTIATE:
200 s->internal->renegotiate = 1;
201 s->internal->state = SSL_ST_CONNECT;
202 s->ctx->internal->stats.sess_connect_renegotiate++;
203 /* break */
204 case SSL_ST_BEFORE:
205 case SSL_ST_CONNECT:
206 case SSL_ST_BEFORE|SSL_ST_CONNECT:
207 case SSL_ST_OK|SSL_ST_CONNECT:
208
209 s->server = 0;
210 if (cb != NULL)
211 cb(s, SSL_CB_HANDSHAKE_START, 1);
212
213 if ((s->version & 0xff00 ) != 0x0300) {
214 SSLerr(SSL_F_SSL3_CONNECT,
215 ERR_R_INTERNAL_ERROR);
216 ret = -1;
217 goto end;
218 }
219
220 /* s->version=SSL3_VERSION; */
221 s->internal->type = SSL_ST_CONNECT;
222
223 if (!ssl3_setup_init_buffer(s)) {
224 ret = -1;
225 goto end;
226 }
227 if (!ssl3_setup_buffers(s)) {
228 ret = -1;
229 goto end;
230 }
231 if (!ssl_init_wbio_buffer(s, 0)) {
232 ret = -1;
233 goto end;
234 }
235
236 /* don't push the buffering BIO quite yet */
237
238 if (!tls1_init_finished_mac(s)) {
239 ret = -1;
240 goto end;
241 }
242
243 s->internal->state = SSL3_ST_CW_CLNT_HELLO_A;
244 s->ctx->internal->stats.sess_connect++;
245 s->internal->init_num = 0;
246 break;
247
248 case SSL3_ST_CW_CLNT_HELLO_A:
249 case SSL3_ST_CW_CLNT_HELLO_B:
250
251 s->internal->shutdown = 0;
252 ret = ssl3_client_hello(s);
253 if (ret <= 0)
254 goto end;
255 s->internal->state = SSL3_ST_CR_SRVR_HELLO_A;
256 s->internal->init_num = 0;
257
258 /* turn on buffering for the next lot of output */
259 if (s->bbio != s->wbio)
260 s->wbio = BIO_push(s->bbio, s->wbio);
261
262 break;
263
264 case SSL3_ST_CR_SRVR_HELLO_A:
265 case SSL3_ST_CR_SRVR_HELLO_B:
266 ret = ssl3_get_server_hello(s);
267 if (ret <= 0)
268 goto end;
269
270 if (s->internal->hit) {
271 s->internal->state = SSL3_ST_CR_FINISHED_A;
272 if (s->internal->tlsext_ticket_expected) {
273 /* receive renewed session ticket */
274 s->internal->state = SSL3_ST_CR_SESSION_TICKET_A;
275 }
276 } else
277 s->internal->state = SSL3_ST_CR_CERT_A;
278 s->internal->init_num = 0;
279 break;
280
281 case SSL3_ST_CR_CERT_A:
282 case SSL3_ST_CR_CERT_B:
283 ret = ssl3_check_finished(s);
284 if (ret <= 0)
285 goto end;
286 if (ret == 2) {
287 s->internal->hit = 1;
288 if (s->internal->tlsext_ticket_expected)
289 s->internal->state = SSL3_ST_CR_SESSION_TICKET_A;
290 else
291 s->internal->state = SSL3_ST_CR_FINISHED_A;
292 s->internal->init_num = 0;
293 break;
294 }
295 /* Check if it is anon DH/ECDH. */
296 if (!(S3I(s)->tmp.new_cipher->algorithm_auth &
297 SSL_aNULL)) {
298 ret = ssl3_get_server_certificate(s);
299 if (ret <= 0)
300 goto end;
301 if (s->internal->tlsext_status_expected)
302 s->internal->state = SSL3_ST_CR_CERT_STATUS_A;
303 else
304 s->internal->state = SSL3_ST_CR_KEY_EXCH_A;
305 } else {
306 skip = 1;
307 s->internal->state = SSL3_ST_CR_KEY_EXCH_A;
308 }
309 s->internal->init_num = 0;
310 break;
311
312 case SSL3_ST_CR_KEY_EXCH_A:
313 case SSL3_ST_CR_KEY_EXCH_B:
314 ret = ssl3_get_server_key_exchange(s);
315 if (ret <= 0)
316 goto end;
317 s->internal->state = SSL3_ST_CR_CERT_REQ_A;
318 s->internal->init_num = 0;
319
320 /*
321 * At this point we check that we have the
322 * required stuff from the server.
323 */
324 if (!ssl3_check_cert_and_algorithm(s)) {
325 ret = -1;
326 goto end;
327 }
328 break;
329
330 case SSL3_ST_CR_CERT_REQ_A:
331 case SSL3_ST_CR_CERT_REQ_B:
332 ret = ssl3_get_certificate_request(s);
333 if (ret <= 0)
334 goto end;
335 s->internal->state = SSL3_ST_CR_SRVR_DONE_A;
336 s->internal->init_num = 0;
337 break;
338
339 case SSL3_ST_CR_SRVR_DONE_A:
340 case SSL3_ST_CR_SRVR_DONE_B:
341 ret = ssl3_get_server_done(s);
342 if (ret <= 0)
343 goto end;
344 if (S3I(s)->tmp.cert_req)
345 s->internal->state = SSL3_ST_CW_CERT_A;
346 else
347 s->internal->state = SSL3_ST_CW_KEY_EXCH_A;
348 s->internal->init_num = 0;
349
350 break;
351
352 case SSL3_ST_CW_CERT_A:
353 case SSL3_ST_CW_CERT_B:
354 case SSL3_ST_CW_CERT_C:
355 case SSL3_ST_CW_CERT_D:
356 ret = ssl3_send_client_certificate(s);
357 if (ret <= 0)
358 goto end;
359 s->internal->state = SSL3_ST_CW_KEY_EXCH_A;
360 s->internal->init_num = 0;
361 break;
362
363 case SSL3_ST_CW_KEY_EXCH_A:
364 case SSL3_ST_CW_KEY_EXCH_B:
365 ret = ssl3_send_client_key_exchange(s);
366 if (ret <= 0)
367 goto end;
368 /*
369 * EAY EAY EAY need to check for DH fix cert
370 * sent back
371 */
372 /*
373 * For TLS, cert_req is set to 2, so a cert chain
374 * of nothing is sent, but no verify packet is sent
375 */
376 /*
377 * XXX: For now, we do not support client
378 * authentication in ECDH cipher suites with
379 * ECDH (rather than ECDSA) certificates.
380 * We need to skip the certificate verify
381 * message when client's ECDH public key is sent
382 * inside the client certificate.
383 */
384 if (S3I(s)->tmp.cert_req == 1) {
385 s->internal->state = SSL3_ST_CW_CERT_VRFY_A;
386 } else {
387 s->internal->state = SSL3_ST_CW_CHANGE_A;
388 S3I(s)->change_cipher_spec = 0;
389 }
390 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
391 s->internal->state = SSL3_ST_CW_CHANGE_A;
392 S3I(s)->change_cipher_spec = 0;
393 }
394
395 s->internal->init_num = 0;
396 break;
397
398 case SSL3_ST_CW_CERT_VRFY_A:
399 case SSL3_ST_CW_CERT_VRFY_B:
400 ret = ssl3_send_client_verify(s);
401 if (ret <= 0)
402 goto end;
403 s->internal->state = SSL3_ST_CW_CHANGE_A;
404 s->internal->init_num = 0;
405 S3I(s)->change_cipher_spec = 0;
406 break;
407
408 case SSL3_ST_CW_CHANGE_A:
409 case SSL3_ST_CW_CHANGE_B:
410 ret = ssl3_send_change_cipher_spec(s,
411 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B);
412 if (ret <= 0)
413 goto end;
414
415 if (S3I(s)->next_proto_neg_seen)
416 s->internal->state = SSL3_ST_CW_NEXT_PROTO_A;
417 else
418 s->internal->state = SSL3_ST_CW_FINISHED_A;
419 s->internal->init_num = 0;
420
421 s->session->cipher = S3I(s)->tmp.new_cipher;
422 if (!s->method->internal->ssl3_enc->setup_key_block(s)) {
423 ret = -1;
424 goto end;
425 }
426
427 if (!s->method->internal->ssl3_enc->change_cipher_state(s,
428 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
429 ret = -1;
430 goto end;
431 }
432
433 break;
434
435 case SSL3_ST_CW_NEXT_PROTO_A:
436 case SSL3_ST_CW_NEXT_PROTO_B:
437 ret = ssl3_send_next_proto(s);
438 if (ret <= 0)
439 goto end;
440 s->internal->state = SSL3_ST_CW_FINISHED_A;
441 break;
442
443 case SSL3_ST_CW_FINISHED_A:
444 case SSL3_ST_CW_FINISHED_B:
445 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A,
446 SSL3_ST_CW_FINISHED_B,
447 s->method->internal->ssl3_enc->client_finished_label,
448 s->method->internal->ssl3_enc->client_finished_label_len);
449 if (ret <= 0)
450 goto end;
451 s->s3->flags |= SSL3_FLAGS_CCS_OK;
452 s->internal->state = SSL3_ST_CW_FLUSH;
453
454 /* clear flags */
455 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
456 if (s->internal->hit) {
457 S3I(s)->tmp.next_state = SSL_ST_OK;
458 if (s->s3->flags &
459 SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
460 s->internal->state = SSL_ST_OK;
461 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
462 S3I(s)->delay_buf_pop_ret = 0;
463 }
464 } else {
465 /* Allow NewSessionTicket if ticket expected */
466 if (s->internal->tlsext_ticket_expected)
467 S3I(s)->tmp.next_state =
468 SSL3_ST_CR_SESSION_TICKET_A;
469 else
470
471 S3I(s)->tmp.next_state = SSL3_ST_CR_FINISHED_A;
472 }
473 s->internal->init_num = 0;
474 break;
475
476 case SSL3_ST_CR_SESSION_TICKET_A:
477 case SSL3_ST_CR_SESSION_TICKET_B:
478 ret = ssl3_get_new_session_ticket(s);
479 if (ret <= 0)
480 goto end;
481 s->internal->state = SSL3_ST_CR_FINISHED_A;
482 s->internal->init_num = 0;
483 break;
484
485 case SSL3_ST_CR_CERT_STATUS_A:
486 case SSL3_ST_CR_CERT_STATUS_B:
487 ret = ssl3_get_cert_status(s);
488 if (ret <= 0)
489 goto end;
490 s->internal->state = SSL3_ST_CR_KEY_EXCH_A;
491 s->internal->init_num = 0;
492 break;
493
494 case SSL3_ST_CR_FINISHED_A:
495 case SSL3_ST_CR_FINISHED_B:
496 s->s3->flags |= SSL3_FLAGS_CCS_OK;
497 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
498 SSL3_ST_CR_FINISHED_B);
499 if (ret <= 0)
500 goto end;
501
502 if (s->internal->hit)
503 s->internal->state = SSL3_ST_CW_CHANGE_A;
504 else
505 s->internal->state = SSL_ST_OK;
506 s->internal->init_num = 0;
507 break;
508
509 case SSL3_ST_CW_FLUSH:
510 s->internal->rwstate = SSL_WRITING;
511 if (BIO_flush(s->wbio) <= 0) {
512 ret = -1;
513 goto end;
514 }
515 s->internal->rwstate = SSL_NOTHING;
516 s->internal->state = S3I(s)->tmp.next_state;
517 break;
518
519 case SSL_ST_OK:
520 /* clean a few things up */
521 tls1_cleanup_key_block(s);
522
523 BUF_MEM_free(s->internal->init_buf);
524 s->internal->init_buf = NULL;
525
526 /*
527 * If we are not 'joining' the last two packets,
528 * remove the buffering now
529 */
530 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
531 ssl_free_wbio_buffer(s);
532 /* else do it later in ssl3_write */
533
534 s->internal->init_num = 0;
535 s->internal->renegotiate = 0;
536 s->internal->new_session = 0;
537
538 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
539 if (s->internal->hit)
540 s->ctx->internal->stats.sess_hit++;
541
542 ret = 1;
543 /* s->server=0; */
544 s->internal->handshake_func = ssl3_connect;
545 s->ctx->internal->stats.sess_connect_good++;
546
547 if (cb != NULL)
548 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
549
550 goto end;
551 /* break; */
552
553 default:
554 SSLerr(SSL_F_SSL3_CONNECT,
555 SSL_R_UNKNOWN_STATE);
556 ret = -1;
557 goto end;
558 /* break; */
559 }
560
561 /* did we do anything */
562 if (!S3I(s)->tmp.reuse_message && !skip) {
563 if (s->internal->debug) {
564 if ((ret = BIO_flush(s->wbio)) <= 0)
565 goto end;
566 }
567
568 if ((cb != NULL) && (s->internal->state != state)) {
569 new_state = s->internal->state;
570 s->internal->state = state;
571 cb(s, SSL_CB_CONNECT_LOOP, 1);
572 s->internal->state = new_state;
573 }
574 }
575 skip = 0;
576 }
577
578end:
579 s->internal->in_handshake--;
580 if (cb != NULL)
581 cb(s, SSL_CB_CONNECT_EXIT, ret);
582
583 return (ret);
584}
585
586int
587ssl3_client_hello(SSL *s)
588{
589 unsigned char *bufend, *p, *d;
590 uint16_t max_version;
591 size_t outlen;
592 int i;
593
594 bufend = (unsigned char *)s->internal->init_buf->data + SSL3_RT_MAX_PLAIN_LENGTH;
595
596 if (s->internal->state == SSL3_ST_CW_CLNT_HELLO_A) {
597 SSL_SESSION *sess = s->session;
598
599 if (ssl_supported_version_range(s, NULL, &max_version) != 1) {
600 SSLerr(SSL_F_SSL3_CLIENT_HELLO,
601 SSL_R_NO_PROTOCOLS_AVAILABLE);
602 return (-1);
603 }
604 s->client_version = s->version = max_version;
605
606 if ((sess == NULL) ||
607 (sess->ssl_version != s->version) ||
608 (!sess->session_id_length && !sess->tlsext_tick) ||
609 (sess->internal->not_resumable)) {
610 if (!ssl_get_new_session(s, 0))
611 goto err;
612 }
613 /* else use the pre-loaded session */
614
615 /*
616 * If a DTLS ClientHello message is being resent after a
617 * HelloVerifyRequest, we must retain the original client
618 * random value.
619 */
620 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0)
621 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE);
622
623 d = p = ssl3_handshake_msg_start(s, SSL3_MT_CLIENT_HELLO);
624
625 /*
626 * Version indicates the negotiated version: for example from
627 * an SSLv2/v3 compatible client hello). The client_version
628 * field is the maximum version we permit and it is also
629 * used in RSA encrypted premaster secrets. Some servers can
630 * choke if we initially report a higher version then
631 * renegotiate to a lower one in the premaster secret. This
632 * didn't happen with TLS 1.0 as most servers supported it
633 * but it can with TLS 1.1 or later if the server only supports
634 * 1.0.
635 *
636 * Possible scenario with previous logic:
637 * 1. Client hello indicates TLS 1.2
638 * 2. Server hello says TLS 1.0
639 * 3. RSA encrypted premaster secret uses 1.2.
640 * 4. Handhaked proceeds using TLS 1.0.
641 * 5. Server sends hello request to renegotiate.
642 * 6. Client hello indicates TLS v1.0 as we now
643 * know that is maximum server supports.
644 * 7. Server chokes on RSA encrypted premaster secret
645 * containing version 1.0.
646 *
647 * For interoperability it should be OK to always use the
648 * maximum version we support in client hello and then rely
649 * on the checking of version to ensure the servers isn't
650 * being inconsistent: for example initially negotiating with
651 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
652 * client_version in client hello and not resetting it to
653 * the negotiated version.
654 */
655
656 *(p++) = s->client_version >> 8;
657 *(p++) = s->client_version & 0xff;
658
659 /* Random stuff */
660 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
661 p += SSL3_RANDOM_SIZE;
662
663 /* Session ID */
664 if (s->internal->new_session)
665 i = 0;
666 else
667 i = s->session->session_id_length;
668 *(p++) = i;
669 if (i != 0) {
670 if (i > (int)sizeof(s->session->session_id)) {
671 SSLerr(SSL_F_SSL3_CLIENT_HELLO,
672 ERR_R_INTERNAL_ERROR);
673 goto err;
674 }
675 memcpy(p, s->session->session_id, i);
676 p += i;
677 }
678
679 /* DTLS Cookie. */
680 if (SSL_IS_DTLS(s)) {
681 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) {
682 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,
683 ERR_R_INTERNAL_ERROR);
684 goto err;
685 }
686 *(p++) = D1I(s)->cookie_len;
687 memcpy(p, D1I(s)->cookie, D1I(s)->cookie_len);
688 p += D1I(s)->cookie_len;
689 }
690
691 /* Ciphers supported */
692 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &p[2],
693 bufend - &p[2], &outlen))
694 goto err;
695 if (outlen == 0) {
696 SSLerr(SSL_F_SSL3_CLIENT_HELLO,
697 SSL_R_NO_CIPHERS_AVAILABLE);
698 goto err;
699 }
700 s2n(outlen, p);
701 p += outlen;
702
703 /* add in (no) COMPRESSION */
704 *(p++) = 1;
705 *(p++) = 0; /* Add the NULL method */
706
707 /* TLS extensions*/
708 if ((p = ssl_add_clienthello_tlsext(s, p, bufend)) == NULL) {
709 SSLerr(SSL_F_SSL3_CLIENT_HELLO,
710 ERR_R_INTERNAL_ERROR);
711 goto err;
712 }
713
714 ssl3_handshake_msg_finish(s, p - d);
715
716 s->internal->state = SSL3_ST_CW_CLNT_HELLO_B;
717 }
718
719 /* SSL3_ST_CW_CLNT_HELLO_B */
720 return (ssl3_handshake_write(s));
721
722err:
723 return (-1);
724}
725
726int
727ssl3_get_server_hello(SSL *s)
728{
729 CBS cbs, server_random, session_id;
730 uint16_t server_version, cipher_suite;
731 uint16_t min_version, max_version;
732 uint8_t compression_method;
733 STACK_OF(SSL_CIPHER) *sk;
734 const SSL_CIPHER *cipher;
735 const SSL_METHOD *method;
736 unsigned char *p;
737 unsigned long alg_k;
738 size_t outlen;
739 int i, al, ok;
740 long n;
741
742 s->internal->first_packet = 1;
743 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_HELLO_A,
744 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok);
745 if (!ok)
746 return ((int)n);
747 s->internal->first_packet = 0;
748
749 if (n < 0)
750 goto truncated;
751
752 CBS_init(&cbs, s->internal->init_msg, n);
753
754 if (SSL_IS_DTLS(s)) {
755 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
756 if (D1I(s)->send_cookie == 0) {
757 S3I(s)->tmp.reuse_message = 1;
758 return (1);
759 } else {
760 /* Already sent a cookie. */
761 al = SSL_AD_UNEXPECTED_MESSAGE;
762 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
763 SSL_R_BAD_MESSAGE_TYPE);
764 goto f_err;
765 }
766 }
767 }
768
769 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) {
770 al = SSL_AD_UNEXPECTED_MESSAGE;
771 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
772 SSL_R_BAD_MESSAGE_TYPE);
773 goto f_err;
774 }
775
776 if (!CBS_get_u16(&cbs, &server_version))
777 goto truncated;
778
779 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) {
780 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
781 SSL_R_NO_PROTOCOLS_AVAILABLE);
782 goto err;
783 }
784
785 if (server_version < min_version || server_version > max_version) {
786 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
787 s->version = (s->version & 0xff00) | (server_version & 0xff);
788 al = SSL_AD_PROTOCOL_VERSION;
789 goto f_err;
790 }
791 s->version = server_version;
792
793 if ((method = tls1_get_client_method(server_version)) == NULL)
794 method = dtls1_get_client_method(server_version);
795 if (method == NULL) {
796 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
797 goto err;
798 }
799 s->method = method;
800
801 /* Server random. */
802 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE))
803 goto truncated;
804 if (!CBS_write_bytes(&server_random, s->s3->server_random,
805 sizeof(s->s3->server_random), NULL))
806 goto err;
807
808 /* Session ID. */
809 if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
810 goto truncated;
811
812 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) ||
813 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) {
814 al = SSL_AD_ILLEGAL_PARAMETER;
815 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
816 SSL_R_SSL3_SESSION_ID_TOO_LONG);
817 goto f_err;
818 }
819
820 /* Cipher suite. */
821 if (!CBS_get_u16(&cbs, &cipher_suite))
822 goto truncated;
823
824 /*
825 * Check if we want to resume the session based on external
826 * pre-shared secret.
827 */
828 if (s->internal->tls_session_secret_cb) {
829 SSL_CIPHER *pref_cipher = NULL;
830 s->session->master_key_length = sizeof(s->session->master_key);
831 if (s->internal->tls_session_secret_cb(s, s->session->master_key,
832 &s->session->master_key_length, NULL, &pref_cipher,
833 s->internal->tls_session_secret_cb_arg)) {
834 s->session->cipher = pref_cipher ? pref_cipher :
835 ssl3_get_cipher_by_value(cipher_suite);
836 s->s3->flags |= SSL3_FLAGS_CCS_OK;
837 }
838 }
839
840 if (s->session->session_id_length != 0 &&
841 CBS_mem_equal(&session_id, s->session->session_id,
842 s->session->session_id_length)) {
843 if (s->sid_ctx_length != s->session->sid_ctx_length ||
844 timingsafe_memcmp(s->session->sid_ctx,
845 s->sid_ctx, s->sid_ctx_length) != 0) {
846 /* actually a client application bug */
847 al = SSL_AD_ILLEGAL_PARAMETER;
848 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
849 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
850 goto f_err;
851 }
852 s->s3->flags |= SSL3_FLAGS_CCS_OK;
853 s->internal->hit = 1;
854 } else {
855 /* a miss or crap from the other end */
856
857 /* If we were trying for session-id reuse, make a new
858 * SSL_SESSION so we don't stuff up other people */
859 s->internal->hit = 0;
860 if (s->session->session_id_length > 0) {
861 if (!ssl_get_new_session(s, 0)) {
862 al = SSL_AD_INTERNAL_ERROR;
863 goto f_err;
864 }
865 }
866
867 /*
868 * XXX - improve the handling for the case where there is a
869 * zero length session identifier.
870 */
871 if (!CBS_write_bytes(&session_id, s->session->session_id,
872 sizeof(s->session->session_id), &outlen))
873 goto err;
874 s->session->session_id_length = outlen;
875
876 s->session->ssl_version = s->version;
877 }
878
879 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) {
880 al = SSL_AD_ILLEGAL_PARAMETER;
881 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
882 SSL_R_UNKNOWN_CIPHER_RETURNED);
883 goto f_err;
884 }
885
886 /* TLS v1.2 only ciphersuites require v1.2 or later. */
887 if ((cipher->algorithm_ssl & SSL_TLSV1_2) &&
888 (TLS1_get_version(s) < TLS1_2_VERSION)) {
889 al = SSL_AD_ILLEGAL_PARAMETER;
890 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
891 SSL_R_WRONG_CIPHER_RETURNED);
892 goto f_err;
893 }
894
895 sk = ssl_get_ciphers_by_id(s);
896 i = sk_SSL_CIPHER_find(sk, cipher);
897 if (i < 0) {
898 /* we did not say we would use this cipher */
899 al = SSL_AD_ILLEGAL_PARAMETER;
900 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
901 SSL_R_WRONG_CIPHER_RETURNED);
902 goto f_err;
903 }
904
905 /*
906 * Depending on the session caching (internal/external), the cipher
907 * and/or cipher_id values may not be set. Make sure that
908 * cipher_id is set and use it for comparison.
909 */
910 if (s->session->cipher)
911 s->session->cipher_id = s->session->cipher->id;
912 if (s->internal->hit && (s->session->cipher_id != cipher->id)) {
913 al = SSL_AD_ILLEGAL_PARAMETER;
914 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
915 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
916 goto f_err;
917 }
918 S3I(s)->tmp.new_cipher = cipher;
919
920 /*
921 * Don't digest cached records if no sigalgs: we may need them for
922 * client authentication.
923 */
924 alg_k = S3I(s)->tmp.new_cipher->algorithm_mkey;
925 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) &&
926 !tls1_digest_cached_records(s)) {
927 al = SSL_AD_INTERNAL_ERROR;
928 goto f_err;
929 }
930
931 if (!CBS_get_u8(&cbs, &compression_method))
932 goto truncated;
933
934 if (compression_method != 0) {
935 al = SSL_AD_ILLEGAL_PARAMETER;
936 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
937 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
938 goto f_err;
939 }
940
941 /* TLS extensions. */
942 p = (unsigned char *)CBS_data(&cbs);
943 if (!ssl_parse_serverhello_tlsext(s, &p, CBS_len(&cbs), &al)) {
944 /* 'al' set by ssl_parse_serverhello_tlsext */
945 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
946 goto f_err;
947 }
948 if (ssl_check_serverhello_tlsext(s) <= 0) {
949 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
950 goto err;
951 }
952
953 /* See if any data remains... */
954 if (p - CBS_data(&cbs) != CBS_len(&cbs))
955 goto truncated;
956
957 return (1);
958
959truncated:
960 /* wrong packet length */
961 al = SSL_AD_DECODE_ERROR;
962 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
963f_err:
964 ssl3_send_alert(s, SSL3_AL_FATAL, al);
965err:
966 return (-1);
967}
968
969int
970ssl3_get_server_certificate(SSL *s)
971{
972 int al, i, ok, ret = -1;
973 long n;
974 CBS cbs, cert_list;
975 X509 *x = NULL;
976 const unsigned char *q;
977 STACK_OF(X509) *sk = NULL;
978 SESS_CERT *sc;
979 EVP_PKEY *pkey = NULL;
980
981 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A,
982 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok);
983
984 if (!ok)
985 return ((int)n);
986
987 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) {
988 S3I(s)->tmp.reuse_message = 1;
989 return (1);
990 }
991
992 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) {
993 al = SSL_AD_UNEXPECTED_MESSAGE;
994 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
995 SSL_R_BAD_MESSAGE_TYPE);
996 goto f_err;
997 }
998
999
1000 if ((sk = sk_X509_new_null()) == NULL) {
1001 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1002 ERR_R_MALLOC_FAILURE);
1003 goto err;
1004 }
1005
1006 if (n < 0)
1007 goto truncated;
1008
1009 CBS_init(&cbs, s->internal->init_msg, n);
1010 if (CBS_len(&cbs) < 3)
1011 goto truncated;
1012
1013 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) ||
1014 CBS_len(&cbs) != 0) {
1015 al = SSL_AD_DECODE_ERROR;
1016 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1017 SSL_R_LENGTH_MISMATCH);
1018 goto f_err;
1019 }
1020
1021 while (CBS_len(&cert_list) > 0) {
1022 CBS cert;
1023
1024 if (CBS_len(&cert_list) < 3)
1025 goto truncated;
1026 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) {
1027 al = SSL_AD_DECODE_ERROR;
1028 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1029 SSL_R_CERT_LENGTH_MISMATCH);
1030 goto f_err;
1031 }
1032
1033 q = CBS_data(&cert);
1034 x = d2i_X509(NULL, &q, CBS_len(&cert));
1035 if (x == NULL) {
1036 al = SSL_AD_BAD_CERTIFICATE;
1037 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1038 ERR_R_ASN1_LIB);
1039 goto f_err;
1040 }
1041 if (q != CBS_data(&cert) + CBS_len(&cert)) {
1042 al = SSL_AD_DECODE_ERROR;
1043 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1044 SSL_R_CERT_LENGTH_MISMATCH);
1045 goto f_err;
1046 }
1047 if (!sk_X509_push(sk, x)) {
1048 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1049 ERR_R_MALLOC_FAILURE);
1050 goto err;
1051 }
1052 x = NULL;
1053 }
1054
1055 i = ssl_verify_cert_chain(s, sk);
1056 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) {
1057 al = ssl_verify_alarm_type(s->verify_result);
1058 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1059 SSL_R_CERTIFICATE_VERIFY_FAILED);
1060 goto f_err;
1061
1062 }
1063 ERR_clear_error(); /* but we keep s->verify_result */
1064
1065 sc = ssl_sess_cert_new();
1066 if (sc == NULL)
1067 goto err;
1068 ssl_sess_cert_free(SSI(s)->sess_cert);
1069 SSI(s)->sess_cert = sc;
1070
1071 sc->cert_chain = sk;
1072 /*
1073 * Inconsistency alert: cert_chain does include the peer's
1074 * certificate, which we don't include in s3_srvr.c
1075 */
1076 x = sk_X509_value(sk, 0);
1077 sk = NULL;
1078 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1079
1080 pkey = X509_get_pubkey(x);
1081
1082 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
1083 x = NULL;
1084 al = SSL3_AL_FATAL;
1085 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1086 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1087 goto f_err;
1088 }
1089
1090 i = ssl_cert_type(x, pkey);
1091 if (i < 0) {
1092 x = NULL;
1093 al = SSL3_AL_FATAL;
1094 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1095 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1096 goto f_err;
1097 }
1098
1099 sc->peer_cert_type = i;
1100 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1101 /*
1102 * Why would the following ever happen?
1103 * We just created sc a couple of lines ago.
1104 */
1105 X509_free(sc->peer_pkeys[i].x509);
1106 sc->peer_pkeys[i].x509 = x;
1107 sc->peer_key = &(sc->peer_pkeys[i]);
1108
1109 X509_free(s->session->peer);
1110 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1111 s->session->peer = x;
1112 s->session->verify_result = s->verify_result;
1113
1114 x = NULL;
1115 ret = 1;
1116
1117 if (0) {
1118truncated:
1119 /* wrong packet length */
1120 al = SSL_AD_DECODE_ERROR;
1121 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1122 SSL_R_BAD_PACKET_LENGTH);
1123f_err:
1124 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1125 }
1126err:
1127 EVP_PKEY_free(pkey);
1128 X509_free(x);
1129 sk_X509_pop_free(sk, X509_free);
1130
1131 return (ret);
1132}
1133
1134static int
1135ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn)
1136{
1137 CBS cbs, dhp, dhg, dhpk;
1138 BN_CTX *bn_ctx = NULL;
1139 SESS_CERT *sc = NULL;
1140 DH *dh = NULL;
1141 long alg_a;
1142 int al;
1143
1144 alg_a = S3I(s)->tmp.new_cipher->algorithm_auth;
1145 sc = SSI(s)->sess_cert;
1146
1147 if (*nn < 0)
1148 goto err;
1149
1150 CBS_init(&cbs, *pp, *nn);
1151
1152 if ((dh = DH_new()) == NULL) {
1153 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1154 goto err;
1155 }
1156
1157 if (!CBS_get_u16_length_prefixed(&cbs, &dhp))
1158 goto truncated;
1159 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) {
1160 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1161 goto err;
1162 }
1163
1164 if (!CBS_get_u16_length_prefixed(&cbs, &dhg))
1165 goto truncated;
1166 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) {
1167 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1168 goto err;
1169 }
1170
1171 if (!CBS_get_u16_length_prefixed(&cbs, &dhpk))
1172 goto truncated;
1173 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk),
1174 NULL)) == NULL) {
1175 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1176 goto err;
1177 }
1178
1179 /*
1180 * Check the strength of the DH key just constructed.
1181 * Discard keys weaker than 1024 bits.
1182 */
1183 if (DH_size(dh) < 1024 / 8) {
1184 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1185 goto err;
1186 }
1187
1188 if (alg_a & SSL_aRSA)
1189 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1190 else if (alg_a & SSL_aDSS)
1191 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1192 else
1193 /* XXX - Anonymous DH, so no certificate or pkey. */
1194 *pkey = NULL;
1195
1196 sc->peer_dh_tmp = dh;
1197
1198 *nn = CBS_len(&cbs);
1199 *pp = (unsigned char *)CBS_data(&cbs);
1200
1201 return (1);
1202
1203 truncated:
1204 al = SSL_AD_DECODE_ERROR;
1205 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_PACKET_LENGTH);
1206 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1207
1208 err:
1209 DH_free(dh);
1210 BN_CTX_free(bn_ctx);
1211
1212 return (-1);
1213}
1214
1215static int
1216ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public)
1217{
1218 const EC_GROUP *group;
1219 EC_GROUP *ngroup = NULL;
1220 EC_POINT *point = NULL;
1221 BN_CTX *bn_ctx = NULL;
1222 EC_KEY *ecdh = NULL;
1223 int ret = -1;
1224
1225 /*
1226 * Extract the server's ephemeral ECDH public key.
1227 */
1228
1229 if ((ecdh = EC_KEY_new()) == NULL) {
1230 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1231 goto err;
1232 }
1233
1234 if ((ngroup = EC_GROUP_new_by_curve_name(nid)) == NULL) {
1235 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1236 goto err;
1237 }
1238 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1239 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1240 goto err;
1241 }
1242
1243 group = EC_KEY_get0_group(ecdh);
1244
1245 if ((point = EC_POINT_new(group)) == NULL ||
1246 (bn_ctx = BN_CTX_new()) == NULL) {
1247 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1248 goto err;
1249 }
1250
1251 if (EC_POINT_oct2point(group, point, CBS_data(public),
1252 CBS_len(public), bn_ctx) == 0) {
1253 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1254 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1255 goto err;
1256 }
1257
1258 EC_KEY_set_public_key(ecdh, point);
1259 sc->peer_ecdh_tmp = ecdh;
1260 ecdh = NULL;
1261
1262 ret = 1;
1263
1264 err:
1265 BN_CTX_free(bn_ctx);
1266 EC_GROUP_free(ngroup);
1267 EC_POINT_free(point);
1268 EC_KEY_free(ecdh);
1269
1270 return (ret);
1271}
1272
1273static int
1274ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public)
1275{
1276 size_t outlen;
1277
1278 if (nid != NID_X25519) {
1279 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1280 goto err;
1281 }
1282
1283 if (CBS_len(public) != X25519_KEY_LENGTH) {
1284 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1285 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1286 goto err;
1287 }
1288
1289 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) {
1290 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1291 goto err;
1292 }
1293
1294 return (1);
1295
1296 err:
1297 return (-1);
1298}
1299
1300static int
1301ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, unsigned char **pp, long *nn)
1302{
1303 CBS cbs, public;
1304 uint8_t curve_type;
1305 uint16_t curve_id;
1306 SESS_CERT *sc;
1307 long alg_a;
1308 int nid;
1309 int al;
1310
1311 alg_a = S3I(s)->tmp.new_cipher->algorithm_auth;
1312 sc = SSI(s)->sess_cert;
1313
1314 if (*nn < 0)
1315 goto err;
1316
1317 CBS_init(&cbs, *pp, *nn);
1318
1319 /* Only named curves are supported. */
1320 if (!CBS_get_u8(&cbs, &curve_type) ||
1321 curve_type != NAMED_CURVE_TYPE ||
1322 !CBS_get_u16(&cbs, &curve_id)) {
1323 al = SSL_AD_DECODE_ERROR;
1324 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1325 goto f_err;
1326 }
1327
1328 /*
1329 * Check that the curve is one of our preferences - if it is not,
1330 * the server has sent us an invalid curve.
1331 */
1332 if (tls1_check_curve(s, curve_id) != 1) {
1333 al = SSL_AD_DECODE_ERROR;
1334 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
1335 goto f_err;
1336 }
1337
1338 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) {
1339 al = SSL_AD_INTERNAL_ERROR;
1340 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1341 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1342 goto f_err;
1343 }
1344
1345 if (!CBS_get_u8_length_prefixed(&cbs, &public))
1346 goto truncated;
1347
1348 if (nid == NID_X25519) {
1349 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1)
1350 goto err;
1351 } else {
1352 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1)
1353 goto err;
1354 }
1355
1356 /*
1357 * The ECC/TLS specification does not mention the use of DSA to sign
1358 * ECParameters in the server key exchange message. We do support RSA
1359 * and ECDSA.
1360 */
1361 if (alg_a & SSL_aRSA)
1362 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1363 else if (alg_a & SSL_aECDSA)
1364 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509);
1365 else
1366 /* XXX - Anonymous ECDH, so no certificate or pkey. */
1367 *pkey = NULL;
1368
1369 *nn = CBS_len(&cbs);
1370 *pp = (unsigned char *)CBS_data(&cbs);
1371
1372 return (1);
1373
1374 truncated:
1375 al = SSL_AD_DECODE_ERROR;
1376 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_PACKET_LENGTH);
1377
1378 f_err:
1379 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1380
1381 err:
1382 return (-1);
1383}
1384
1385int
1386ssl3_get_server_key_exchange(SSL *s)
1387{
1388 unsigned char *q, md_buf[EVP_MAX_MD_SIZE*2];
1389 EVP_MD_CTX md_ctx;
1390 unsigned char *param, *p;
1391 int al, i, j, param_len, ok;
1392 long n, alg_k, alg_a;
1393 EVP_PKEY *pkey = NULL;
1394 const EVP_MD *md = NULL;
1395 RSA *rsa = NULL;
1396
1397 alg_k = S3I(s)->tmp.new_cipher->algorithm_mkey;
1398 alg_a = S3I(s)->tmp.new_cipher->algorithm_auth;
1399
1400 /*
1401 * Use same message size as in ssl3_get_certificate_request()
1402 * as ServerKeyExchange message may be skipped.
1403 */
1404 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A,
1405 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok);
1406 if (!ok)
1407 return ((int)n);
1408
1409 EVP_MD_CTX_init(&md_ctx);
1410
1411 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1412 /*
1413 * Do not skip server key exchange if this cipher suite uses
1414 * ephemeral keys.
1415 */
1416 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
1417 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1418 SSL_R_UNEXPECTED_MESSAGE);
1419 al = SSL_AD_UNEXPECTED_MESSAGE;
1420 goto f_err;
1421 }
1422
1423 S3I(s)->tmp.reuse_message = 1;
1424 EVP_MD_CTX_cleanup(&md_ctx);
1425 return (1);
1426 }
1427
1428 if (SSI(s)->sess_cert != NULL) {
1429 DH_free(SSI(s)->sess_cert->peer_dh_tmp);
1430 SSI(s)->sess_cert->peer_dh_tmp = NULL;
1431
1432 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp);
1433 SSI(s)->sess_cert->peer_ecdh_tmp = NULL;
1434
1435 free(SSI(s)->sess_cert->peer_x25519_tmp);
1436 SSI(s)->sess_cert->peer_x25519_tmp = NULL;
1437 } else {
1438 SSI(s)->sess_cert = ssl_sess_cert_new();
1439 if (SSI(s)->sess_cert == NULL)
1440 goto err;
1441 }
1442
1443 param = p = (unsigned char *)s->internal->init_msg;
1444 param_len = n;
1445
1446 if (alg_k & SSL_kDHE) {
1447 if (ssl3_get_server_kex_dhe(s, &pkey, &p, &n) != 1)
1448 goto err;
1449 } else if (alg_k & SSL_kECDHE) {
1450 if (ssl3_get_server_kex_ecdhe(s, &pkey, &p, &n) != 1)
1451 goto err;
1452 } else if (alg_k != 0) {
1453 al = SSL_AD_UNEXPECTED_MESSAGE;
1454 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1455 goto f_err;
1456 }
1457
1458 param_len = param_len - n;
1459
1460 /* if it was signed, check the signature */
1461 if (pkey != NULL) {
1462 if (SSL_USE_SIGALGS(s)) {
1463 int sigalg = tls12_get_sigid(pkey);
1464 /* Should never happen */
1465 if (sigalg == -1) {
1466 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1467 ERR_R_INTERNAL_ERROR);
1468 goto err;
1469 }
1470 /*
1471 * Check key type is consistent
1472 * with signature
1473 */
1474 if (2 > n)
1475 goto truncated;
1476 if (sigalg != (int)p[1]) {
1477 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1478 SSL_R_WRONG_SIGNATURE_TYPE);
1479 al = SSL_AD_DECODE_ERROR;
1480 goto f_err;
1481 }
1482 md = tls12_get_hash(p[0]);
1483 if (md == NULL) {
1484 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1485 SSL_R_UNKNOWN_DIGEST);
1486 al = SSL_AD_DECODE_ERROR;
1487 goto f_err;
1488 }
1489 p += 2;
1490 n -= 2;
1491 } else
1492 md = EVP_sha1();
1493
1494 if (2 > n)
1495 goto truncated;
1496 n2s(p, i);
1497 n -= 2;
1498 j = EVP_PKEY_size(pkey);
1499
1500 if (i != n || n > j) {
1501 /* wrong packet length */
1502 al = SSL_AD_DECODE_ERROR;
1503 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1504 SSL_R_WRONG_SIGNATURE_LENGTH);
1505 goto f_err;
1506 }
1507
1508 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
1509 int num;
1510
1511 j = 0;
1512 q = md_buf;
1513 for (num = 2; num > 0; num--) {
1514 if (!EVP_DigestInit_ex(&md_ctx,
1515 (num == 2) ? s->ctx->internal->md5 :
1516 s->ctx->internal->sha1, NULL)) {
1517 al = SSL_AD_INTERNAL_ERROR;
1518 goto f_err;
1519 }
1520 EVP_DigestUpdate(&md_ctx,
1521 s->s3->client_random,
1522 SSL3_RANDOM_SIZE);
1523 EVP_DigestUpdate(&md_ctx,
1524 s->s3->server_random,
1525 SSL3_RANDOM_SIZE);
1526 EVP_DigestUpdate(&md_ctx, param, param_len);
1527 EVP_DigestFinal_ex(&md_ctx, q,
1528 (unsigned int *)&i);
1529 q += i;
1530 j += i;
1531 }
1532 i = RSA_verify(NID_md5_sha1, md_buf, j,
1533 p, n, pkey->pkey.rsa);
1534 if (i < 0) {
1535 al = SSL_AD_DECRYPT_ERROR;
1536 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1537 SSL_R_BAD_RSA_DECRYPT);
1538 goto f_err;
1539 }
1540 if (i == 0) {
1541 /* bad signature */
1542 al = SSL_AD_DECRYPT_ERROR;
1543 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1544 SSL_R_BAD_SIGNATURE);
1545 goto f_err;
1546 }
1547 } else {
1548 EVP_VerifyInit_ex(&md_ctx, md, NULL);
1549 EVP_VerifyUpdate(&md_ctx, s->s3->client_random,
1550 SSL3_RANDOM_SIZE);
1551 EVP_VerifyUpdate(&md_ctx, s->s3->server_random,
1552 SSL3_RANDOM_SIZE);
1553 EVP_VerifyUpdate(&md_ctx, param, param_len);
1554 if (EVP_VerifyFinal(&md_ctx, p,(int)n, pkey) <= 0) {
1555 /* bad signature */
1556 al = SSL_AD_DECRYPT_ERROR;
1557 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1558 SSL_R_BAD_SIGNATURE);
1559 goto f_err;
1560 }
1561 }
1562 } else {
1563 /* aNULL does not need public keys. */
1564 if (!(alg_a & SSL_aNULL)) {
1565 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1566 ERR_R_INTERNAL_ERROR);
1567 goto err;
1568 }
1569 /* still data left over */
1570 if (n != 0) {
1571 al = SSL_AD_DECODE_ERROR;
1572 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1573 SSL_R_EXTRA_DATA_IN_MESSAGE);
1574 goto f_err;
1575 }
1576 }
1577
1578 EVP_PKEY_free(pkey);
1579 EVP_MD_CTX_cleanup(&md_ctx);
1580
1581 return (1);
1582
1583 truncated:
1584 /* wrong packet length */
1585 al = SSL_AD_DECODE_ERROR;
1586 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_PACKET_LENGTH);
1587
1588 f_err:
1589 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1590
1591 err:
1592 EVP_PKEY_free(pkey);
1593 RSA_free(rsa);
1594 EVP_MD_CTX_cleanup(&md_ctx);
1595
1596 return (-1);
1597}
1598
1599int
1600ssl3_get_certificate_request(SSL *s)
1601{
1602 int ok, ret = 0;
1603 long n;
1604 uint8_t ctype_num;
1605 CBS cert_request, ctypes, rdn_list;
1606 X509_NAME *xn = NULL;
1607 const unsigned char *q;
1608 STACK_OF(X509_NAME) *ca_sk = NULL;
1609
1610 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A,
1611 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok);
1612
1613 if (!ok)
1614 return ((int)n);
1615
1616 S3I(s)->tmp.cert_req = 0;
1617
1618 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) {
1619 S3I(s)->tmp.reuse_message = 1;
1620 /*
1621 * If we get here we don't need any cached handshake records
1622 * as we wont be doing client auth.
1623 */
1624 if (S3I(s)->handshake_buffer) {
1625 if (!tls1_digest_cached_records(s))
1626 goto err;
1627 }
1628 return (1);
1629 }
1630
1631 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
1632 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1633 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1634 SSL_R_WRONG_MESSAGE_TYPE);
1635 goto err;
1636 }
1637
1638 /* TLS does not like anon-DH with client cert */
1639 if (S3I(s)->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
1640 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1641 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1642 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1643 goto err;
1644 }
1645
1646 if (n < 0)
1647 goto truncated;
1648 CBS_init(&cert_request, s->internal->init_msg, n);
1649
1650 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
1651 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1652 ERR_R_MALLOC_FAILURE);
1653 goto err;
1654 }
1655
1656 /* get the certificate types */
1657 if (!CBS_get_u8(&cert_request, &ctype_num))
1658 goto truncated;
1659
1660 if (ctype_num > SSL3_CT_NUMBER)
1661 ctype_num = SSL3_CT_NUMBER;
1662 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) ||
1663 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype,
1664 sizeof(S3I(s)->tmp.ctype), NULL)) {
1665 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1666 SSL_R_DATA_LENGTH_TOO_LONG);
1667 goto err;
1668 }
1669
1670 if (SSL_USE_SIGALGS(s)) {
1671 CBS sigalgs;
1672
1673 if (CBS_len(&cert_request) < 2) {
1674 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1675 SSL_R_DATA_LENGTH_TOO_LONG);
1676 goto err;
1677 }
1678
1679 /* Check we have enough room for signature algorithms and
1680 * following length value.
1681 */
1682 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) {
1683 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1684 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1685 SSL_R_DATA_LENGTH_TOO_LONG);
1686 goto err;
1687 }
1688 if ((CBS_len(&sigalgs) & 1) ||
1689 !tls1_process_sigalgs(s, CBS_data(&sigalgs),
1690 CBS_len(&sigalgs))) {
1691 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1692 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1693 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1694 goto err;
1695 }
1696 }
1697
1698 /* get the CA RDNs */
1699 if (CBS_len(&cert_request) < 2) {
1700 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1701 SSL_R_DATA_LENGTH_TOO_LONG);
1702 goto err;
1703 }
1704
1705 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) ||
1706 CBS_len(&cert_request) != 0) {
1707 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1708 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1709 SSL_R_LENGTH_MISMATCH);
1710 goto err;
1711 }
1712
1713 while (CBS_len(&rdn_list) > 0) {
1714 CBS rdn;
1715
1716 if (CBS_len(&rdn_list) < 2) {
1717 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1718 SSL_R_DATA_LENGTH_TOO_LONG);
1719 goto err;
1720 }
1721
1722 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) {
1723 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1724 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1725 SSL_R_CA_DN_TOO_LONG);
1726 goto err;
1727 }
1728
1729 q = CBS_data(&rdn);
1730 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) {
1731 ssl3_send_alert(s, SSL3_AL_FATAL,
1732 SSL_AD_DECODE_ERROR);
1733 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1734 ERR_R_ASN1_LIB);
1735 goto err;
1736 }
1737
1738 if (q != CBS_data(&rdn) + CBS_len(&rdn)) {
1739 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1740 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1741 SSL_R_CA_DN_LENGTH_MISMATCH);
1742 goto err;
1743 }
1744 if (!sk_X509_NAME_push(ca_sk, xn)) {
1745 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1746 ERR_R_MALLOC_FAILURE);
1747 goto err;
1748 }
1749 xn = NULL; /* avoid free in err block */
1750 }
1751
1752 /* we should setup a certificate to return.... */
1753 S3I(s)->tmp.cert_req = 1;
1754 S3I(s)->tmp.ctype_num = ctype_num;
1755 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free);
1756 S3I(s)->tmp.ca_names = ca_sk;
1757 ca_sk = NULL;
1758
1759 ret = 1;
1760 if (0) {
1761truncated:
1762 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1763 SSL_R_BAD_PACKET_LENGTH);
1764 }
1765err:
1766 X509_NAME_free(xn);
1767 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
1768 return (ret);
1769}
1770
1771static int
1772ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1773{
1774 return (X509_NAME_cmp(*a, *b));
1775}
1776
1777int
1778ssl3_get_new_session_ticket(SSL *s)
1779{
1780 int ok, al, ret = 0;
1781 uint32_t lifetime_hint;
1782 long n;
1783 CBS cbs, session_ticket;
1784
1785 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A,
1786 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok);
1787 if (!ok)
1788 return ((int)n);
1789
1790 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) {
1791 S3I(s)->tmp.reuse_message = 1;
1792 return (1);
1793 }
1794 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) {
1795 al = SSL_AD_UNEXPECTED_MESSAGE;
1796 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,
1797 SSL_R_BAD_MESSAGE_TYPE);
1798 goto f_err;
1799 }
1800
1801 if (n < 0) {
1802 al = SSL_AD_DECODE_ERROR;
1803 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,
1804 SSL_R_LENGTH_MISMATCH);
1805 goto f_err;
1806 }
1807
1808 CBS_init(&cbs, s->internal->init_msg, n);
1809 if (!CBS_get_u32(&cbs, &lifetime_hint) ||
1810#if UINT32_MAX > LONG_MAX
1811 lifetime_hint > LONG_MAX ||
1812#endif
1813 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) ||
1814 CBS_len(&cbs) != 0) {
1815 al = SSL_AD_DECODE_ERROR;
1816 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,
1817 SSL_R_LENGTH_MISMATCH);
1818 goto f_err;
1819 }
1820 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint;
1821
1822 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick,
1823 &s->session->tlsext_ticklen)) {
1824 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,
1825 ERR_R_MALLOC_FAILURE);
1826 goto err;
1827 }
1828
1829 /*
1830 * There are two ways to detect a resumed ticket sesion.
1831 * One is to set an appropriate session ID and then the server
1832 * must return a match in ServerHello. This allows the normal
1833 * client session ID matching to work and we know much
1834 * earlier that the ticket has been accepted.
1835 *
1836 * The other way is to set zero length session ID when the
1837 * ticket is presented and rely on the handshake to determine
1838 * session resumption.
1839 *
1840 * We choose the former approach because this fits in with
1841 * assumptions elsewhere in OpenSSL. The session ID is set
1842 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1843 * ticket.
1844 */
1845 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket),
1846 s->session->session_id, &s->session->session_id_length,
1847 EVP_sha256(), NULL);
1848 ret = 1;
1849 return (ret);
1850f_err:
1851 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1852err:
1853 return (-1);
1854}
1855
1856int
1857ssl3_get_cert_status(SSL *s)
1858{
1859 CBS cert_status, response;
1860 size_t stow_len;
1861 int ok, al;
1862 long n;
1863 uint8_t status_type;
1864
1865 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A,
1866 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS,
1867 16384, &ok);
1868
1869 if (!ok)
1870 return ((int)n);
1871
1872 if (n < 0) {
1873 /* need at least status type + length */
1874 al = SSL_AD_DECODE_ERROR;
1875 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,
1876 SSL_R_LENGTH_MISMATCH);
1877 goto f_err;
1878 }
1879
1880 CBS_init(&cert_status, s->internal->init_msg, n);
1881 if (!CBS_get_u8(&cert_status, &status_type) ||
1882 CBS_len(&cert_status) < 3) {
1883 /* need at least status type + length */
1884 al = SSL_AD_DECODE_ERROR;
1885 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,
1886 SSL_R_LENGTH_MISMATCH);
1887 goto f_err;
1888 }
1889
1890 if (status_type != TLSEXT_STATUSTYPE_ocsp) {
1891 al = SSL_AD_DECODE_ERROR;
1892 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,
1893 SSL_R_UNSUPPORTED_STATUS_TYPE);
1894 goto f_err;
1895 }
1896
1897 if (!CBS_get_u24_length_prefixed(&cert_status, &response) ||
1898 CBS_len(&cert_status) != 0) {
1899 al = SSL_AD_DECODE_ERROR;
1900 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,
1901 SSL_R_LENGTH_MISMATCH);
1902 goto f_err;
1903 }
1904
1905 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp,
1906 &stow_len) || stow_len > INT_MAX) {
1907 s->internal->tlsext_ocsp_resplen = 0;
1908 al = SSL_AD_INTERNAL_ERROR;
1909 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,
1910 ERR_R_MALLOC_FAILURE);
1911 goto f_err;
1912 }
1913 s->internal->tlsext_ocsp_resplen = (int)stow_len;
1914
1915 if (s->ctx->internal->tlsext_status_cb) {
1916 int ret;
1917 ret = s->ctx->internal->tlsext_status_cb(s,
1918 s->ctx->internal->tlsext_status_arg);
1919 if (ret == 0) {
1920 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1921 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,
1922 SSL_R_INVALID_STATUS_RESPONSE);
1923 goto f_err;
1924 }
1925 if (ret < 0) {
1926 al = SSL_AD_INTERNAL_ERROR;
1927 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,
1928 ERR_R_MALLOC_FAILURE);
1929 goto f_err;
1930 }
1931 }
1932 return (1);
1933f_err:
1934 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1935 return (-1);
1936}
1937
1938int
1939ssl3_get_server_done(SSL *s)
1940{
1941 int ok, ret = 0;
1942 long n;
1943
1944 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A,
1945 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE,
1946 30, /* should be very small, like 0 :-) */ &ok);
1947
1948 if (!ok)
1949 return ((int)n);
1950 if (n > 0) {
1951 /* should contain no data */
1952 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1953 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
1954 return (-1);
1955 }
1956 ret = 1;
1957 return (ret);
1958}
1959
1960static int
1961ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
1962{
1963 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH];
1964 unsigned char *enc_pms = NULL;
1965 EVP_PKEY *pkey = NULL;
1966 int ret = -1;
1967 int enc_len;
1968 CBB epms;
1969
1970 /*
1971 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1.
1972 */
1973
1974 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1975 if (pkey == NULL || pkey->type != EVP_PKEY_RSA ||
1976 pkey->pkey.rsa == NULL) {
1977 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1978 ERR_R_INTERNAL_ERROR);
1979 goto err;
1980 }
1981
1982 pms[0] = s->client_version >> 8;
1983 pms[1] = s->client_version & 0xff;
1984 arc4random_buf(&pms[2], sizeof(pms) - 2);
1985
1986 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) {
1987 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1988 ERR_R_MALLOC_FAILURE);
1989 goto err;
1990 }
1991
1992 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa,
1993 RSA_PKCS1_PADDING);
1994 if (enc_len <= 0) {
1995 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1996 SSL_R_BAD_RSA_ENCRYPT);
1997 goto err;
1998 }
1999
2000 if (!CBB_add_u16_length_prefixed(cbb, &epms))
2001 goto err;
2002 if (!CBB_add_bytes(&epms, enc_pms, enc_len))
2003 goto err;
2004 if (!CBB_flush(cbb))
2005 goto err;
2006
2007 s->session->master_key_length =
2008 s->method->internal->ssl3_enc->generate_master_secret(s,
2009 s->session->master_key, pms, sizeof(pms));
2010
2011 ret = 1;
2012
2013err:
2014 explicit_bzero(pms, sizeof(pms));
2015 EVP_PKEY_free(pkey);
2016 free(enc_pms);
2017
2018 return (ret);
2019}
2020
2021static int
2022ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
2023{
2024 DH *dh_srvr = NULL, *dh_clnt = NULL;
2025 unsigned char *key = NULL;
2026 int key_size = 0, key_len;
2027 unsigned char *data;
2028 int ret = -1;
2029 CBB dh_Yc;
2030
2031 /* Ensure that we have an ephemeral key for DHE. */
2032 if (sess_cert->peer_dh_tmp == NULL) {
2033 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2034 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2035 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2036 goto err;
2037 }
2038 dh_srvr = sess_cert->peer_dh_tmp;
2039
2040 /* Generate a new random key. */
2041 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2042 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2043 goto err;
2044 }
2045 if (!DH_generate_key(dh_clnt)) {
2046 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2047 goto err;
2048 }
2049 key_size = DH_size(dh_clnt);
2050 if ((key = malloc(key_size)) == NULL) {
2051 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2052 ERR_R_MALLOC_FAILURE);
2053 goto err;
2054 }
2055 key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt);
2056 if (key_len <= 0) {
2057 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2058 goto err;
2059 }
2060
2061 /* Generate master key from the result. */
2062 s->session->master_key_length =
2063 s->method->internal->ssl3_enc->generate_master_secret(s,
2064 s->session->master_key, key, key_len);
2065
2066 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc))
2067 goto err;
2068 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key)))
2069 goto err;
2070 BN_bn2bin(dh_clnt->pub_key, data);
2071 if (!CBB_flush(cbb))
2072 goto err;
2073
2074 ret = 1;
2075
2076err:
2077 DH_free(dh_clnt);
2078 if (key != NULL)
2079 explicit_bzero(key, key_size);
2080 free(key);
2081
2082 return (ret);
2083}
2084
2085static int
2086ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb)
2087{
2088 const EC_GROUP *group = NULL;
2089 const EC_POINT *point = NULL;
2090 EC_KEY *ecdh = NULL;
2091 BN_CTX *bn_ctx = NULL;
2092 unsigned char *key = NULL;
2093 unsigned char *data;
2094 size_t encoded_len;
2095 int key_size = 0, key_len;
2096 int ret = -1;
2097 CBB ecpoint;
2098
2099 if ((group = EC_KEY_get0_group(sc->peer_ecdh_tmp)) == NULL ||
2100 (point = EC_KEY_get0_public_key(sc->peer_ecdh_tmp)) == NULL) {
2101 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2102 ERR_R_INTERNAL_ERROR);
2103 goto err;
2104 }
2105
2106 if ((ecdh = EC_KEY_new()) == NULL) {
2107 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2108 ERR_R_MALLOC_FAILURE);
2109 goto err;
2110 }
2111
2112 if (!EC_KEY_set_group(ecdh, group)) {
2113 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2114 goto err;
2115 }
2116
2117 /* Generate a new ECDH key pair. */
2118 if (!(EC_KEY_generate_key(ecdh))) {
2119 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2120 goto err;
2121 }
2122 if ((key_size = ECDH_size(ecdh)) <= 0) {
2123 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2124 goto err;
2125 }
2126 if ((key = malloc(key_size)) == NULL) {
2127 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2128 ERR_R_MALLOC_FAILURE);
2129 }
2130 key_len = ECDH_compute_key(key, key_size, point, ecdh, NULL);
2131 if (key_len <= 0) {
2132 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2133 goto err;
2134 }
2135
2136 /* Generate master key from the result. */
2137 s->session->master_key_length =
2138 s->method->internal->ssl3_enc->generate_master_secret(s,
2139 s->session->master_key, key, key_len);
2140
2141 encoded_len = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh),
2142 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL);
2143 if (encoded_len == 0) {
2144 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2145 goto err;
2146 }
2147
2148 if ((bn_ctx = BN_CTX_new()) == NULL) {
2149 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2150 ERR_R_MALLOC_FAILURE);
2151 goto err;
2152 }
2153
2154 /* Encode the public key. */
2155 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
2156 goto err;
2157 if (!CBB_add_space(&ecpoint, &data, encoded_len))
2158 goto err;
2159 if (EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh),
2160 POINT_CONVERSION_UNCOMPRESSED, data, encoded_len,
2161 bn_ctx) == 0)
2162 goto err;
2163 if (!CBB_flush(cbb))
2164 goto err;
2165
2166 ret = 1;
2167
2168 err:
2169 if (key != NULL)
2170 explicit_bzero(key, key_size);
2171 free(key);
2172
2173 BN_CTX_free(bn_ctx);
2174 EC_KEY_free(ecdh);
2175
2176 return (ret);
2177}
2178
2179static int
2180ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb)
2181{
2182 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL;
2183 int ret = -1;
2184 CBB ecpoint;
2185
2186 /* Generate X25519 key pair and derive shared key. */
2187 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL)
2188 goto err;
2189 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL)
2190 goto err;
2191 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL)
2192 goto err;
2193 X25519_keypair(public_key, private_key);
2194 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp))
2195 goto err;
2196
2197 /* Serialize the public key. */
2198 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
2199 goto err;
2200 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH))
2201 goto err;
2202 if (!CBB_flush(cbb))
2203 goto err;
2204
2205 /* Generate master key from the result. */
2206 s->session->master_key_length =
2207 s->method->internal->ssl3_enc->generate_master_secret(s,
2208 s->session->master_key, shared_key, X25519_KEY_LENGTH);
2209
2210 ret = 1;
2211
2212 err:
2213 if (private_key != NULL)
2214 explicit_bzero(private_key, X25519_KEY_LENGTH);
2215 if (shared_key != NULL)
2216 explicit_bzero(shared_key, X25519_KEY_LENGTH);
2217
2218 free(public_key);
2219 free(private_key);
2220 free(shared_key);
2221
2222 return (ret);
2223}
2224
2225static int
2226ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb)
2227{
2228 if (sc->peer_x25519_tmp != NULL) {
2229 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1)
2230 goto err;
2231 } else if (sc->peer_ecdh_tmp != NULL) {
2232 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1)
2233 goto err;
2234 } else {
2235 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2236 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2237 ERR_R_INTERNAL_ERROR);
2238 goto err;
2239 }
2240
2241 return (1);
2242
2243 err:
2244 return (-1);
2245}
2246
2247static int
2248ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
2249{
2250 unsigned char premaster_secret[32], shared_ukm[32], tmp[256];
2251 EVP_PKEY *pub_key = NULL;
2252 EVP_PKEY_CTX *pkey_ctx;
2253 X509 *peer_cert;
2254 size_t msglen;
2255 unsigned int md_len;
2256 EVP_MD_CTX *ukm_hash;
2257 int ret = -1;
2258 int nid;
2259 CBB gostblob;
2260
2261 /* Get server sertificate PKEY and create ctx from it */
2262 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509;
2263 if (peer_cert == NULL) {
2264 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2265 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2266 goto err;
2267 }
2268
2269 pub_key = X509_get_pubkey(peer_cert);
2270 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL);
2271
2272 /*
2273 * If we have send a certificate, and certificate key parameters match
2274 * those of server certificate, use certificate key for key exchange.
2275 * Otherwise, generate ephemeral key pair.
2276 */
2277 EVP_PKEY_encrypt_init(pkey_ctx);
2278
2279 /* Generate session key. */
2280 arc4random_buf(premaster_secret, 32);
2281
2282 /*
2283 * If we have client certificate, use its secret as peer key.
2284 */
2285 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) {
2286 if (EVP_PKEY_derive_set_peer(pkey_ctx,
2287 s->cert->key->privatekey) <=0) {
2288 /*
2289 * If there was an error - just ignore it.
2290 * Ephemeral key would be used.
2291 */
2292 ERR_clear_error();
2293 }
2294 }
2295
2296 /*
2297 * Compute shared IV and store it in algorithm-specific context data.
2298 */
2299 ukm_hash = EVP_MD_CTX_create();
2300 if (ukm_hash == NULL) {
2301 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2302 ERR_R_MALLOC_FAILURE);
2303 goto err;
2304 }
2305
2306 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94)
2307 nid = NID_id_GostR3411_94;
2308 else
2309 nid = NID_id_tc26_gost3411_2012_256;
2310 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid)))
2311 goto err;
2312 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE);
2313 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE);
2314 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2315 EVP_MD_CTX_destroy(ukm_hash);
2316 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
2317 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) {
2318 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_LIBRARY_BUG);
2319 goto err;
2320 }
2321
2322 /*
2323 * Make GOST keytransport blob message, encapsulate it into sequence.
2324 */
2325 msglen = 255;
2326 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret,
2327 32) < 0) {
2328 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_LIBRARY_BUG);
2329 goto err;
2330 }
2331
2332 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE))
2333 goto err;
2334 if (!CBB_add_bytes(&gostblob, tmp, msglen))
2335 goto err;
2336 if (!CBB_flush(cbb))
2337 goto err;
2338
2339 /* Check if pubkey from client certificate was used. */
2340 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2,
2341 NULL) > 0) {
2342 /* Set flag "skip certificate verify". */
2343 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2344 }
2345 EVP_PKEY_CTX_free(pkey_ctx);
2346 s->session->master_key_length =
2347 s->method->internal->ssl3_enc->generate_master_secret(s,
2348 s->session->master_key, premaster_secret, 32);
2349
2350 ret = 1;
2351
2352 err:
2353 explicit_bzero(premaster_secret, sizeof(premaster_secret));
2354 EVP_PKEY_free(pub_key);
2355
2356 return (ret);
2357}
2358
2359int
2360ssl3_send_client_key_exchange(SSL *s)
2361{
2362 SESS_CERT *sess_cert;
2363 unsigned long alg_k;
2364 CBB cbb, kex;
2365
2366 memset(&cbb, 0, sizeof(cbb));
2367
2368 if (s->internal->state == SSL3_ST_CW_KEY_EXCH_A) {
2369 alg_k = S3I(s)->tmp.new_cipher->algorithm_mkey;
2370
2371 if ((sess_cert = SSI(s)->sess_cert) == NULL) {
2372 ssl3_send_alert(s, SSL3_AL_FATAL,
2373 SSL_AD_UNEXPECTED_MESSAGE);
2374 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2375 ERR_R_INTERNAL_ERROR);
2376 goto err;
2377 }
2378
2379 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &kex,
2380 SSL3_MT_CLIENT_KEY_EXCHANGE))
2381 goto err;
2382
2383 if (alg_k & SSL_kRSA) {
2384 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1)
2385 goto err;
2386 } else if (alg_k & SSL_kDHE) {
2387 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1)
2388 goto err;
2389 } else if (alg_k & SSL_kECDHE) {
2390 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1)
2391 goto err;
2392 } else if (alg_k & SSL_kGOST) {
2393 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1)
2394 goto err;
2395 } else {
2396 ssl3_send_alert(s, SSL3_AL_FATAL,
2397 SSL_AD_HANDSHAKE_FAILURE);
2398 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2399 ERR_R_INTERNAL_ERROR);
2400 goto err;
2401 }
2402
2403 if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
2404 goto err;
2405
2406 s->internal->state = SSL3_ST_CW_KEY_EXCH_B;
2407 }
2408
2409 /* SSL3_ST_CW_KEY_EXCH_B */
2410 return (ssl3_handshake_write(s));
2411
2412err:
2413 CBB_cleanup(&cbb);
2414
2415 return (-1);
2416}
2417
2418int
2419ssl3_send_client_verify(SSL *s)
2420{
2421 unsigned char *p;
2422 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
2423 EVP_PKEY *pkey;
2424 EVP_PKEY_CTX *pctx = NULL;
2425 EVP_MD_CTX mctx;
2426 unsigned u = 0;
2427 unsigned long n;
2428 int j;
2429
2430 EVP_MD_CTX_init(&mctx);
2431
2432 if (s->internal->state == SSL3_ST_CW_CERT_VRFY_A) {
2433 p = ssl3_handshake_msg_start(s, SSL3_MT_CERTIFICATE_VERIFY);
2434
2435 /*
2436 * Create context from key and test if sha1 is allowed as
2437 * digest.
2438 */
2439 pkey = s->cert->key->privatekey;
2440 pctx = EVP_PKEY_CTX_new(pkey, NULL);
2441 EVP_PKEY_sign_init(pctx);
2442 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
2443 if (!SSL_USE_SIGALGS(s))
2444 s->method->internal->ssl3_enc->cert_verify_mac(s,
2445 NID_sha1, &(data[MD5_DIGEST_LENGTH]));
2446 } else {
2447 ERR_clear_error();
2448 }
2449 /*
2450 * For TLS v1.2 send signature algorithm and signature
2451 * using agreed digest and cached handshake records.
2452 */
2453 if (SSL_USE_SIGALGS(s)) {
2454 long hdatalen = 0;
2455 void *hdata;
2456 const EVP_MD *md = s->cert->key->digest;
2457 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer,
2458 &hdata);
2459 if (hdatalen <= 0 ||
2460 !tls12_get_sigandhash(p, pkey, md)) {
2461 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2462 ERR_R_INTERNAL_ERROR);
2463 goto err;
2464 }
2465 p += 2;
2466 if (!EVP_SignInit_ex(&mctx, md, NULL) ||
2467 !EVP_SignUpdate(&mctx, hdata, hdatalen) ||
2468 !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
2469 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2470 ERR_R_EVP_LIB);
2471 goto err;
2472 }
2473 s2n(u, p);
2474 n = u + 4;
2475 if (!tls1_digest_cached_records(s))
2476 goto err;
2477 } else if (pkey->type == EVP_PKEY_RSA) {
2478 s->method->internal->ssl3_enc->cert_verify_mac(
2479 s, NID_md5, &(data[0]));
2480 if (RSA_sign(NID_md5_sha1, data,
2481 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, &(p[2]),
2482 &u, pkey->pkey.rsa) <= 0 ) {
2483 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2484 ERR_R_RSA_LIB);
2485 goto err;
2486 }
2487 s2n(u, p);
2488 n = u + 2;
2489 } else if (pkey->type == EVP_PKEY_DSA) {
2490 if (!DSA_sign(pkey->save_type,
2491 &(data[MD5_DIGEST_LENGTH]),
2492 SHA_DIGEST_LENGTH, &(p[2]),
2493 (unsigned int *)&j, pkey->pkey.dsa)) {
2494 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2495 ERR_R_DSA_LIB);
2496 goto err;
2497 }
2498 s2n(j, p);
2499 n = j + 2;
2500 } else if (pkey->type == EVP_PKEY_EC) {
2501 if (!ECDSA_sign(pkey->save_type,
2502 &(data[MD5_DIGEST_LENGTH]),
2503 SHA_DIGEST_LENGTH, &(p[2]),
2504 (unsigned int *)&j, pkey->pkey.ec)) {
2505 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2506 ERR_R_ECDSA_LIB);
2507 goto err;
2508 }
2509 s2n(j, p);
2510 n = j + 2;
2511#ifndef OPENSSL_NO_GOST
2512 } else if (pkey->type == NID_id_GostR3410_94 ||
2513 pkey->type == NID_id_GostR3410_2001) {
2514 unsigned char signbuf[128];
2515 long hdatalen = 0;
2516 void *hdata;
2517 const EVP_MD *md;
2518 int nid;
2519 size_t sigsize;
2520
2521 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata);
2522 if (hdatalen <= 0) {
2523 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2524 ERR_R_INTERNAL_ERROR);
2525 goto err;
2526 }
2527 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
2528 !(md = EVP_get_digestbynid(nid))) {
2529 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2530 ERR_R_EVP_LIB);
2531 goto err;
2532 }
2533 if (!EVP_DigestInit_ex(&mctx, md, NULL) ||
2534 !EVP_DigestUpdate(&mctx, hdata, hdatalen) ||
2535 !EVP_DigestFinal(&mctx, signbuf, &u) ||
2536 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) ||
2537 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
2538 EVP_PKEY_CTRL_GOST_SIG_FORMAT,
2539 GOST_SIG_FORMAT_RS_LE,
2540 NULL) <= 0) ||
2541 (EVP_PKEY_sign(pctx, &(p[2]), &sigsize,
2542 signbuf, u) <= 0)) {
2543 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2544 ERR_R_EVP_LIB);
2545 goto err;
2546 }
2547 if (!tls1_digest_cached_records(s))
2548 goto err;
2549 j = sigsize;
2550 s2n(j, p);
2551 n = j + 2;
2552#endif
2553 } else {
2554 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2555 ERR_R_INTERNAL_ERROR);
2556 goto err;
2557 }
2558
2559 s->internal->state = SSL3_ST_CW_CERT_VRFY_B;
2560
2561 ssl3_handshake_msg_finish(s, n);
2562 }
2563
2564 EVP_MD_CTX_cleanup(&mctx);
2565 EVP_PKEY_CTX_free(pctx);
2566
2567 return (ssl3_handshake_write(s));
2568
2569err:
2570 EVP_MD_CTX_cleanup(&mctx);
2571 EVP_PKEY_CTX_free(pctx);
2572 return (-1);
2573}
2574
2575int
2576ssl3_send_client_certificate(SSL *s)
2577{
2578 EVP_PKEY *pkey = NULL;
2579 X509 *x509 = NULL;
2580 CBB cbb, client_cert;
2581 int i;
2582
2583 memset(&cbb, 0, sizeof(cbb));
2584
2585 if (s->internal->state == SSL3_ST_CW_CERT_A) {
2586 if ((s->cert == NULL) || (s->cert->key->x509 == NULL) ||
2587 (s->cert->key->privatekey == NULL))
2588 s->internal->state = SSL3_ST_CW_CERT_B;
2589 else
2590 s->internal->state = SSL3_ST_CW_CERT_C;
2591 }
2592
2593 /* We need to get a client cert */
2594 if (s->internal->state == SSL3_ST_CW_CERT_B) {
2595 /*
2596 * If we get an error, we need to
2597 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2598 * We then get retied later
2599 */
2600 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2601 if (i < 0) {
2602 s->internal->rwstate = SSL_X509_LOOKUP;
2603 return (-1);
2604 }
2605 s->internal->rwstate = SSL_NOTHING;
2606 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
2607 s->internal->state = SSL3_ST_CW_CERT_B;
2608 if (!SSL_use_certificate(s, x509) ||
2609 !SSL_use_PrivateKey(s, pkey))
2610 i = 0;
2611 } else if (i == 1) {
2612 i = 0;
2613 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
2614 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2615 }
2616
2617 X509_free(x509);
2618 EVP_PKEY_free(pkey);
2619 if (i == 0)
2620 S3I(s)->tmp.cert_req = 2;
2621
2622 /* Ok, we have a cert */
2623 s->internal->state = SSL3_ST_CW_CERT_C;
2624 }
2625
2626 if (s->internal->state == SSL3_ST_CW_CERT_C) {
2627 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &client_cert,
2628 SSL3_MT_CERTIFICATE))
2629 goto err;
2630 if (!ssl3_output_cert_chain(s, &client_cert,
2631 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key->x509))
2632 goto err;
2633 if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
2634 goto err;
2635
2636 s->internal->state = SSL3_ST_CW_CERT_D;
2637 }
2638
2639 /* SSL3_ST_CW_CERT_D */
2640 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
2641
2642 err:
2643 CBB_cleanup(&cbb);
2644
2645 return (0);
2646}
2647
2648#define has_bits(i,m) (((i)&(m)) == (m))
2649
2650int
2651ssl3_check_cert_and_algorithm(SSL *s)
2652{
2653 int i, idx;
2654 long alg_k, alg_a;
2655 EVP_PKEY *pkey = NULL;
2656 SESS_CERT *sc;
2657 DH *dh;
2658
2659 alg_k = S3I(s)->tmp.new_cipher->algorithm_mkey;
2660 alg_a = S3I(s)->tmp.new_cipher->algorithm_auth;
2661
2662 /* We don't have a certificate. */
2663 if (alg_a & SSL_aNULL)
2664 return (1);
2665
2666 sc = SSI(s)->sess_cert;
2667 if (sc == NULL) {
2668 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2669 ERR_R_INTERNAL_ERROR);
2670 goto err;
2671 }
2672 dh = SSI(s)->sess_cert->peer_dh_tmp;
2673
2674 /* This is the passed certificate. */
2675
2676 idx = sc->peer_cert_type;
2677 if (idx == SSL_PKEY_ECC) {
2678 if (ssl_check_srvr_ecc_cert_and_alg(
2679 sc->peer_pkeys[idx].x509, s) == 0) {
2680 /* check failed */
2681 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2682 SSL_R_BAD_ECC_CERT);
2683 goto f_err;
2684 } else {
2685 return (1);
2686 }
2687 }
2688 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
2689 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
2690 EVP_PKEY_free(pkey);
2691
2692 /* Check that we have a certificate if we require one. */
2693 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) {
2694 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2695 SSL_R_MISSING_RSA_SIGNING_CERT);
2696 goto f_err;
2697 } else if ((alg_a & SSL_aDSS) &&
2698 !has_bits(i, EVP_PK_DSA|EVP_PKT_SIGN)) {
2699 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2700 SSL_R_MISSING_DSA_SIGNING_CERT);
2701 goto f_err;
2702 }
2703 if ((alg_k & SSL_kRSA) &&
2704 !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) {
2705 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2706 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2707 goto f_err;
2708 }
2709 if ((alg_k & SSL_kDHE) &&
2710 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) {
2711 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2712 SSL_R_MISSING_DH_KEY);
2713 goto f_err;
2714 }
2715
2716 return (1);
2717f_err:
2718 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2719err:
2720 return (0);
2721}
2722
2723int
2724ssl3_send_next_proto(SSL *s)
2725{
2726 unsigned int len, padding_len;
2727 unsigned char *d, *p;
2728
2729 if (s->internal->state == SSL3_ST_CW_NEXT_PROTO_A) {
2730 d = p = ssl3_handshake_msg_start(s, SSL3_MT_NEXT_PROTO);
2731
2732 len = s->internal->next_proto_negotiated_len;
2733 padding_len = 32 - ((len + 2) % 32);
2734 *(p++) = len;
2735 memcpy(p, s->internal->next_proto_negotiated, len);
2736 p += len;
2737 *(p++) = padding_len;
2738 memset(p, 0, padding_len);
2739 p += padding_len;
2740
2741 ssl3_handshake_msg_finish(s, p - d);
2742
2743 s->internal->state = SSL3_ST_CW_NEXT_PROTO_B;
2744 }
2745
2746 return (ssl3_handshake_write(s));
2747}
2748
2749/*
2750 * Check to see if handshake is full or resumed. Usually this is just a
2751 * case of checking to see if a cache hit has occurred. In the case of
2752 * session tickets we have to check the next message to be sure.
2753 */
2754
2755int
2756ssl3_check_finished(SSL *s)
2757{
2758 int ok;
2759 long n;
2760
2761 /* If we have no ticket it cannot be a resumed session. */
2762 if (!s->session->tlsext_tick)
2763 return (1);
2764 /* this function is called when we really expect a Certificate
2765 * message, so permit appropriate message length */
2766 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A,
2767 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok);
2768 if (!ok)
2769 return ((int)n);
2770 S3I(s)->tmp.reuse_message = 1;
2771 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) ||
2772 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2773 return (2);
2774
2775 return (1);
2776}
2777
2778int
2779ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2780{
2781 int i = 0;
2782
2783#ifndef OPENSSL_NO_ENGINE
2784 if (s->ctx->internal->client_cert_engine) {
2785 i = ENGINE_load_ssl_client_cert(
2786 s->ctx->internal->client_cert_engine, s,
2787 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL);
2788 if (i != 0)
2789 return (i);
2790 }
2791#endif
2792 if (s->ctx->internal->client_cert_cb)
2793 i = s->ctx->internal->client_cert_cb(s, px509, ppkey);
2794 return (i);
2795}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-26 19:04:10 +0000