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nfs: fix getattr hint extracting checks
[unleashed/lotheac.git] / lib / libssl / ssl_clnt.c
blob77211b622b0f7ec80fbad608c316f3c353621867
1 /* $OpenBSD: ssl_clnt.c,v 1.34 2018/09/05 16:58:59 jsing Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124 /* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
150
151 #include <limits.h>
152 #include <stdint.h>
153 #include <stdio.h>
154
155 #include "ssl_locl.h"
156
157 #include <openssl/bn.h>
158 #include <openssl/buffer.h>
159 #include <openssl/curve25519.h>
160 #include <openssl/dh.h>
161 #include <openssl/evp.h>
162 #include <openssl/md5.h>
163 #include <openssl/objects.h>
164
165 #ifndef OPENSSL_NO_ENGINE
166 #include <openssl/engine.h>
167 #endif
168 #ifndef OPENSSL_NO_GOST
169 #include <openssl/gost.h>
170 #endif
171
172 #include "bytestring.h"
173 #include "ssl_tlsext.h"
174
175 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b);
176
177 int
178 ssl3_connect(SSL *s)
179 {
180 void (*cb)(const SSL *ssl, int type, int val) = NULL;
181 int ret = -1;
182 int new_state, state, skip = 0;
183
184 ERR_clear_error();
185 errno = 0;
186
187 if (s->internal->info_callback != NULL)
188 cb = s->internal->info_callback;
189 else if (s->ctx->internal->info_callback != NULL)
190 cb = s->ctx->internal->info_callback;
191
192 s->internal->in_handshake++;
193 if (!SSL_in_init(s) || SSL_in_before(s))
194 SSL_clear(s);
195
196 for (;;) {
197 state = S3I(s)->hs.state;
198
199 switch (S3I(s)->hs.state) {
200 case SSL_ST_RENEGOTIATE:
201 s->internal->renegotiate = 1;
202 S3I(s)->hs.state = SSL_ST_CONNECT;
203 s->ctx->internal->stats.sess_connect_renegotiate++;
204 /* break */
205 case SSL_ST_BEFORE:
206 case SSL_ST_CONNECT:
207 case SSL_ST_BEFORE|SSL_ST_CONNECT:
208 case SSL_ST_OK|SSL_ST_CONNECT:
209
210 s->server = 0;
211 if (cb != NULL)
212 cb(s, SSL_CB_HANDSHAKE_START, 1);
213
214 if (SSL_IS_DTLS(s)) {
215 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
216 SSLerror(s, ERR_R_INTERNAL_ERROR);
217 ret = -1;
218 goto end;
219 }
220 } else {
221 if ((s->version & 0xff00) != 0x0300) {
222 SSLerror(s, ERR_R_INTERNAL_ERROR);
223 ret = -1;
224 goto end;
225 }
226 }
227
228 /* s->version=SSL3_VERSION; */
229 s->internal->type = SSL_ST_CONNECT;
230
231 if (!ssl3_setup_init_buffer(s)) {
232 ret = -1;
233 goto end;
234 }
235 if (!ssl3_setup_buffers(s)) {
236 ret = -1;
237 goto end;
238 }
239 if (!ssl_init_wbio_buffer(s, 0)) {
240 ret = -1;
241 goto end;
242 }
243
244 /* don't push the buffering BIO quite yet */
245
246 if (!SSL_IS_DTLS(s)) {
247 if (!tls1_init_finished_mac(s)) {
248 ret = -1;
249 goto end;
250 }
251 }
252
253 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A;
254 s->ctx->internal->stats.sess_connect++;
255 s->internal->init_num = 0;
256
257 if (SSL_IS_DTLS(s)) {
258 /* mark client_random uninitialized */
259 memset(s->s3->client_random, 0,
260 sizeof(s->s3->client_random));
261 D1I(s)->send_cookie = 0;
262 s->internal->hit = 0;
263 }
264 break;
265
266 case SSL3_ST_CW_CLNT_HELLO_A:
267 case SSL3_ST_CW_CLNT_HELLO_B:
268 s->internal->shutdown = 0;
269
270 if (SSL_IS_DTLS(s)) {
271 /* every DTLS ClientHello resets Finished MAC */
272 if (!tls1_init_finished_mac(s)) {
273 ret = -1;
274 goto end;
275 }
276
277 dtls1_start_timer(s);
278 }
279
280 ret = ssl3_send_client_hello(s);
281 if (ret <= 0)
282 goto end;
283
284 if (SSL_IS_DTLS(s) && D1I(s)->send_cookie) {
285 S3I(s)->hs.state = SSL3_ST_CW_FLUSH;
286 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A;
287 } else
288 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A;
289
290 s->internal->init_num = 0;
291
292 /* turn on buffering for the next lot of output */
293 if (s->bbio != s->wbio)
294 s->wbio = BIO_push(s->bbio, s->wbio);
295
296 break;
297
298 case SSL3_ST_CR_SRVR_HELLO_A:
299 case SSL3_ST_CR_SRVR_HELLO_B:
300 ret = ssl3_get_server_hello(s);
301 if (ret <= 0)
302 goto end;
303
304 if (s->internal->hit) {
305 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
306 if (!SSL_IS_DTLS(s)) {
307 if (s->internal->tlsext_ticket_expected) {
308 /* receive renewed session ticket */
309 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A;
310 }
311 }
312 } else if (SSL_IS_DTLS(s)) {
313 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
314 } else {
315 S3I(s)->hs.state = SSL3_ST_CR_CERT_A;
316 }
317 s->internal->init_num = 0;
318 break;
319
320 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
321 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
322 ret = dtls1_get_hello_verify(s);
323 if (ret <= 0)
324 goto end;
325 dtls1_stop_timer(s);
326 if (D1I(s)->send_cookie) /* start again, with a cookie */
327 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A;
328 else
329 S3I(s)->hs.state = SSL3_ST_CR_CERT_A;
330 s->internal->init_num = 0;
331 break;
332
333 case SSL3_ST_CR_CERT_A:
334 case SSL3_ST_CR_CERT_B:
335 ret = ssl3_check_finished(s);
336 if (ret <= 0)
337 goto end;
338 if (ret == 2) {
339 s->internal->hit = 1;
340 if (s->internal->tlsext_ticket_expected)
341 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A;
342 else
343 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
344 s->internal->init_num = 0;
345 break;
346 }
347 /* Check if it is anon DH/ECDH. */
348 if (!(S3I(s)->hs.new_cipher->algorithm_auth &
349 SSL_aNULL)) {
350 ret = ssl3_get_server_certificate(s);
351 if (ret <= 0)
352 goto end;
353 if (s->internal->tlsext_status_expected)
354 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A;
355 else
356 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
357 } else {
358 skip = 1;
359 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
360 }
361 s->internal->init_num = 0;
362 break;
363
364 case SSL3_ST_CR_KEY_EXCH_A:
365 case SSL3_ST_CR_KEY_EXCH_B:
366 ret = ssl3_get_server_key_exchange(s);
367 if (ret <= 0)
368 goto end;
369 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A;
370 s->internal->init_num = 0;
371
372 /*
373 * At this point we check that we have the
374 * required stuff from the server.
375 */
376 if (!ssl3_check_cert_and_algorithm(s)) {
377 ret = -1;
378 goto end;
379 }
380 break;
381
382 case SSL3_ST_CR_CERT_REQ_A:
383 case SSL3_ST_CR_CERT_REQ_B:
384 ret = ssl3_get_certificate_request(s);
385 if (ret <= 0)
386 goto end;
387 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A;
388 s->internal->init_num = 0;
389 break;
390
391 case SSL3_ST_CR_SRVR_DONE_A:
392 case SSL3_ST_CR_SRVR_DONE_B:
393 ret = ssl3_get_server_done(s);
394 if (ret <= 0)
395 goto end;
396 if (SSL_IS_DTLS(s))
397 dtls1_stop_timer(s);
398 if (S3I(s)->tmp.cert_req)
399 S3I(s)->hs.state = SSL3_ST_CW_CERT_A;
400 else
401 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A;
402 s->internal->init_num = 0;
403
404 break;
405
406 case SSL3_ST_CW_CERT_A:
407 case SSL3_ST_CW_CERT_B:
408 case SSL3_ST_CW_CERT_C:
409 case SSL3_ST_CW_CERT_D:
410 if (SSL_IS_DTLS(s))
411 dtls1_start_timer(s);
412 ret = ssl3_send_client_certificate(s);
413 if (ret <= 0)
414 goto end;
415 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A;
416 s->internal->init_num = 0;
417 break;
418
419 case SSL3_ST_CW_KEY_EXCH_A:
420 case SSL3_ST_CW_KEY_EXCH_B:
421 if (SSL_IS_DTLS(s))
422 dtls1_start_timer(s);
423 ret = ssl3_send_client_key_exchange(s);
424 if (ret <= 0)
425 goto end;
426 /*
427 * EAY EAY EAY need to check for DH fix cert
428 * sent back
429 */
430 /*
431 * For TLS, cert_req is set to 2, so a cert chain
432 * of nothing is sent, but no verify packet is sent
433 */
434 /*
435 * XXX: For now, we do not support client
436 * authentication in ECDH cipher suites with
437 * ECDH (rather than ECDSA) certificates.
438 * We need to skip the certificate verify
439 * message when client's ECDH public key is sent
440 * inside the client certificate.
441 */
442 if (S3I(s)->tmp.cert_req == 1) {
443 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A;
444 } else {
445 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
446 S3I(s)->change_cipher_spec = 0;
447 }
448 if (!SSL_IS_DTLS(s)) {
449 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
450 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
451 S3I(s)->change_cipher_spec = 0;
452 }
453 }
454
455 s->internal->init_num = 0;
456 break;
457
458 case SSL3_ST_CW_CERT_VRFY_A:
459 case SSL3_ST_CW_CERT_VRFY_B:
460 if (SSL_IS_DTLS(s))
461 dtls1_start_timer(s);
462 ret = ssl3_send_client_verify(s);
463 if (ret <= 0)
464 goto end;
465 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
466 s->internal->init_num = 0;
467 S3I(s)->change_cipher_spec = 0;
468 break;
469
470 case SSL3_ST_CW_CHANGE_A:
471 case SSL3_ST_CW_CHANGE_B:
472 if (SSL_IS_DTLS(s) && !s->internal->hit)
473 dtls1_start_timer(s);
474 ret = ssl3_send_change_cipher_spec(s,
475 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B);
476 if (ret <= 0)
477 goto end;
478
479 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A;
480 s->internal->init_num = 0;
481
482 s->session->cipher = S3I(s)->hs.new_cipher;
483 if (!tls1_setup_key_block(s)) {
484 ret = -1;
485 goto end;
486 }
487
488 if (!tls1_change_cipher_state(s,
489 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
490 ret = -1;
491 goto end;
492 }
493
494 if (SSL_IS_DTLS(s))
495 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
496
497 break;
498
499 case SSL3_ST_CW_FINISHED_A:
500 case SSL3_ST_CW_FINISHED_B:
501 if (SSL_IS_DTLS(s) && !s->internal->hit)
502 dtls1_start_timer(s);
503 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A,
504 SSL3_ST_CW_FINISHED_B, TLS_MD_CLIENT_FINISH_CONST,
505 TLS_MD_CLIENT_FINISH_CONST_SIZE);
506 if (ret <= 0)
507 goto end;
508 if (!SSL_IS_DTLS(s))
509 s->s3->flags |= SSL3_FLAGS_CCS_OK;
510 S3I(s)->hs.state = SSL3_ST_CW_FLUSH;
511
512 /* clear flags */
513 if (s->internal->hit) {
514 S3I(s)->hs.next_state = SSL_ST_OK;
515 } else {
516 /* Allow NewSessionTicket if ticket expected */
517 if (s->internal->tlsext_ticket_expected)
518 S3I(s)->hs.next_state =
519 SSL3_ST_CR_SESSION_TICKET_A;
520 else
521 S3I(s)->hs.next_state =
522 SSL3_ST_CR_FINISHED_A;
523 }
524 s->internal->init_num = 0;
525 break;
526
527 case SSL3_ST_CR_SESSION_TICKET_A:
528 case SSL3_ST_CR_SESSION_TICKET_B:
529 ret = ssl3_get_new_session_ticket(s);
530 if (ret <= 0)
531 goto end;
532 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
533 s->internal->init_num = 0;
534 break;
535
536 case SSL3_ST_CR_CERT_STATUS_A:
537 case SSL3_ST_CR_CERT_STATUS_B:
538 ret = ssl3_get_cert_status(s);
539 if (ret <= 0)
540 goto end;
541 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
542 s->internal->init_num = 0;
543 break;
544
545 case SSL3_ST_CR_FINISHED_A:
546 case SSL3_ST_CR_FINISHED_B:
547 if (SSL_IS_DTLS(s))
548 D1I(s)->change_cipher_spec_ok = 1;
549 else
550 s->s3->flags |= SSL3_FLAGS_CCS_OK;
551 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
552 SSL3_ST_CR_FINISHED_B);
553 if (ret <= 0)
554 goto end;
555 if (SSL_IS_DTLS(s))
556 dtls1_stop_timer(s);
557
558 if (s->internal->hit)
559 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
560 else
561 S3I(s)->hs.state = SSL_ST_OK;
562 s->internal->init_num = 0;
563 break;
564
565 case SSL3_ST_CW_FLUSH:
566 s->internal->rwstate = SSL_WRITING;
567 if (BIO_flush(s->wbio) <= 0) {
568 if (SSL_IS_DTLS(s)) {
569 /* If the write error was fatal, stop trying */
570 if (!BIO_should_retry(s->wbio)) {
571 s->internal->rwstate = SSL_NOTHING;
572 S3I(s)->hs.state = S3I(s)->hs.next_state;
573 }
574 }
575 ret = -1;
576 goto end;
577 }
578 s->internal->rwstate = SSL_NOTHING;
579 S3I(s)->hs.state = S3I(s)->hs.next_state;
580 break;
581
582 case SSL_ST_OK:
583 /* clean a few things up */
584 tls1_cleanup_key_block(s);
585
586 if (!SSL_IS_DTLS(s)) {
587 BUF_MEM_free(s->internal->init_buf);
588 s->internal->init_buf = NULL;
589 }
590
591 ssl_free_wbio_buffer(s);
592
593 s->internal->init_num = 0;
594 s->internal->renegotiate = 0;
595 s->internal->new_session = 0;
596
597 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
598 if (s->internal->hit)
599 s->ctx->internal->stats.sess_hit++;
600
601 ret = 1;
602 /* s->server=0; */
603 s->internal->handshake_func = ssl3_connect;
604 s->ctx->internal->stats.sess_connect_good++;
605
606 if (cb != NULL)
607 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
608
609 if (SSL_IS_DTLS(s)) {
610 /* done with handshaking */
611 D1I(s)->handshake_read_seq = 0;
612 D1I(s)->next_handshake_write_seq = 0;
613 }
614
615 goto end;
616 /* break; */
617
618 default:
619 SSLerror(s, SSL_R_UNKNOWN_STATE);
620 ret = -1;
621 goto end;
622 /* break; */
623 }
624
625 /* did we do anything */
626 if (!S3I(s)->tmp.reuse_message && !skip) {
627 if (s->internal->debug) {
628 if ((ret = BIO_flush(s->wbio)) <= 0)
629 goto end;
630 }
631
632 if ((cb != NULL) && (S3I(s)->hs.state != state)) {
633 new_state = S3I(s)->hs.state;
634 S3I(s)->hs.state = state;
635 cb(s, SSL_CB_CONNECT_LOOP, 1);
636 S3I(s)->hs.state = new_state;
637 }
638 }
639 skip = 0;
640 }
641
642 end:
643 s->internal->in_handshake--;
644 if (cb != NULL)
645 cb(s, SSL_CB_CONNECT_EXIT, ret);
646
647 return (ret);
648 }
649
650 int
651 ssl3_send_client_hello(SSL *s)
652 {
653 CBB cbb, client_hello, session_id, cookie, cipher_suites;
654 CBB compression_methods;
655 uint16_t max_version;
656 size_t sl;
657
658 memset(&cbb, 0, sizeof(cbb));
659
660 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) {
661 SSL_SESSION *sess = s->session;
662
663 if (ssl_supported_version_range(s, NULL, &max_version) != 1) {
664 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE);
665 return (-1);
666 }
667 s->client_version = s->version = max_version;
668
669 if (sess == NULL ||
670 sess->ssl_version != s->version ||
671 (!sess->session_id_length && !sess->tlsext_tick) ||
672 sess->internal->not_resumable) {
673 if (!ssl_get_new_session(s, 0))
674 goto err;
675 }
676 /* else use the pre-loaded session */
677
678 /*
679 * If a DTLS ClientHello message is being resent after a
680 * HelloVerifyRequest, we must retain the original client
681 * random value.
682 */
683 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0)
684 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE);
685
686 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello,
687 SSL3_MT_CLIENT_HELLO))
688 goto err;
689
690 /*
691 * Version indicates the negotiated version: for example from
692 * an SSLv2/v3 compatible client hello). The client_version
693 * field is the maximum version we permit and it is also
694 * used in RSA encrypted premaster secrets. Some servers can
695 * choke if we initially report a higher version then
696 * renegotiate to a lower one in the premaster secret. This
697 * didn't happen with TLS 1.0 as most servers supported it
698 * but it can with TLS 1.1 or later if the server only supports
699 * 1.0.
700 *
701 * Possible scenario with previous logic:
702 * 1. Client hello indicates TLS 1.2
703 * 2. Server hello says TLS 1.0
704 * 3. RSA encrypted premaster secret uses 1.2.
705 * 4. Handhaked proceeds using TLS 1.0.
706 * 5. Server sends hello request to renegotiate.
707 * 6. Client hello indicates TLS v1.0 as we now
708 * know that is maximum server supports.
709 * 7. Server chokes on RSA encrypted premaster secret
710 * containing version 1.0.
711 *
712 * For interoperability it should be OK to always use the
713 * maximum version we support in client hello and then rely
714 * on the checking of version to ensure the servers isn't
715 * being inconsistent: for example initially negotiating with
716 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
717 * client_version in client hello and not resetting it to
718 * the negotiated version.
719 */
720 if (!CBB_add_u16(&client_hello, s->client_version))
721 goto err;
722
723 /* Random stuff */
724 if (!CBB_add_bytes(&client_hello, s->s3->client_random,
725 sizeof(s->s3->client_random)))
726 goto err;
727
728 /* Session ID */
729 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id))
730 goto err;
731 if (!s->internal->new_session &&
732 s->session->session_id_length > 0) {
733 sl = s->session->session_id_length;
734 if (sl > sizeof(s->session->session_id)) {
735 SSLerror(s, ERR_R_INTERNAL_ERROR);
736 goto err;
737 }
738 if (!CBB_add_bytes(&session_id,
739 s->session->session_id, sl))
740 goto err;
741 }
742
743 /* DTLS Cookie. */
744 if (SSL_IS_DTLS(s)) {
745 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) {
746 SSLerror(s, ERR_R_INTERNAL_ERROR);
747 goto err;
748 }
749 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie))
750 goto err;
751 if (!CBB_add_bytes(&cookie, D1I(s)->cookie,
752 D1I(s)->cookie_len))
753 goto err;
754 }
755
756 /* Ciphers supported */
757 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites))
758 return 0;
759 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s),
760 &cipher_suites)) {
761 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE);
762 goto err;
763 }
764
765 /* Add in compression methods (null) */
766 if (!CBB_add_u8_length_prefixed(&client_hello,
767 &compression_methods))
768 goto err;
769 if (!CBB_add_u8(&compression_methods, 0))
770 goto err;
771
772 /* TLS extensions */
773 if (!tlsext_clienthello_build(s, &client_hello)) {
774 SSLerror(s, ERR_R_INTERNAL_ERROR);
775 goto err;
776 }
777
778 if (!ssl3_handshake_msg_finish(s, &cbb))
779 goto err;
780
781 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B;
782 }
783
784 /* SSL3_ST_CW_CLNT_HELLO_B */
785 return (ssl3_handshake_write(s));
786
787 err:
788 CBB_cleanup(&cbb);
789
790 return (-1);
791 }
792
793 int
794 ssl3_get_server_hello(SSL *s)
795 {
796 CBS cbs, server_random, session_id;
797 uint16_t server_version, cipher_suite;
798 uint16_t min_version, max_version;
799 uint8_t compression_method;
800 STACK_OF(SSL_CIPHER) *sk;
801 const SSL_CIPHER *cipher;
802 const SSL_METHOD *method;
803 unsigned long alg_k;
804 size_t outlen;
805 int i, al, ok;
806 long n;
807
808 s->internal->first_packet = 1;
809 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_HELLO_A,
810 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok);
811 if (!ok)
812 return ((int)n);
813 s->internal->first_packet = 0;
814
815 if (n < 0)
816 goto truncated;
817
818 CBS_init(&cbs, s->internal->init_msg, n);
819
820 if (SSL_IS_DTLS(s)) {
821 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
822 if (D1I(s)->send_cookie == 0) {
823 S3I(s)->tmp.reuse_message = 1;
824 return (1);
825 } else {
826 /* Already sent a cookie. */
827 al = SSL_AD_UNEXPECTED_MESSAGE;
828 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
829 goto f_err;
830 }
831 }
832 }
833
834 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) {
835 al = SSL_AD_UNEXPECTED_MESSAGE;
836 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
837 goto f_err;
838 }
839
840 if (!CBS_get_u16(&cbs, &server_version))
841 goto truncated;
842
843 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) {
844 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE);
845 goto err;
846 }
847
848 if (server_version < min_version || server_version > max_version) {
849 SSLerror(s, SSL_R_WRONG_SSL_VERSION);
850 s->version = (s->version & 0xff00) | (server_version & 0xff);
851 al = SSL_AD_PROTOCOL_VERSION;
852 goto f_err;
853 }
854 s->version = server_version;
855
856 if ((method = tls1_get_client_method(server_version)) == NULL)
857 method = dtls1_get_client_method(server_version);
858 if (method == NULL) {
859 SSLerror(s, ERR_R_INTERNAL_ERROR);
860 goto err;
861 }
862 s->method = method;
863
864 /* Server random. */
865 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE))
866 goto truncated;
867 if (!CBS_write_bytes(&server_random, s->s3->server_random,
868 sizeof(s->s3->server_random), NULL))
869 goto err;
870
871 /* Session ID. */
872 if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
873 goto truncated;
874
875 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) ||
876 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) {
877 al = SSL_AD_ILLEGAL_PARAMETER;
878 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG);
879 goto f_err;
880 }
881
882 /* Cipher suite. */
883 if (!CBS_get_u16(&cbs, &cipher_suite))
884 goto truncated;
885
886 /*
887 * Check if we want to resume the session based on external
888 * pre-shared secret.
889 */
890 if (s->internal->tls_session_secret_cb) {
891 SSL_CIPHER *pref_cipher = NULL;
892 s->session->master_key_length = sizeof(s->session->master_key);
893 if (s->internal->tls_session_secret_cb(s, s->session->master_key,
894 &s->session->master_key_length, NULL, &pref_cipher,
895 s->internal->tls_session_secret_cb_arg)) {
896 s->session->cipher = pref_cipher ? pref_cipher :
897 ssl3_get_cipher_by_value(cipher_suite);
898 s->s3->flags |= SSL3_FLAGS_CCS_OK;
899 }
900 }
901
902 if (s->session->session_id_length != 0 &&
903 CBS_mem_equal(&session_id, s->session->session_id,
904 s->session->session_id_length)) {
905 if (s->sid_ctx_length != s->session->sid_ctx_length ||
906 timingsafe_memcmp(s->session->sid_ctx,
907 s->sid_ctx, s->sid_ctx_length) != 0) {
908 /* actually a client application bug */
909 al = SSL_AD_ILLEGAL_PARAMETER;
910 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
911 goto f_err;
912 }
913 s->s3->flags |= SSL3_FLAGS_CCS_OK;
914 s->internal->hit = 1;
915 } else {
916 /* a miss or crap from the other end */
917
918 /* If we were trying for session-id reuse, make a new
919 * SSL_SESSION so we don't stuff up other people */
920 s->internal->hit = 0;
921 if (s->session->session_id_length > 0) {
922 if (!ssl_get_new_session(s, 0)) {
923 al = SSL_AD_INTERNAL_ERROR;
924 goto f_err;
925 }
926 }
927
928 /*
929 * XXX - improve the handling for the case where there is a
930 * zero length session identifier.
931 */
932 if (!CBS_write_bytes(&session_id, s->session->session_id,
933 sizeof(s->session->session_id), &outlen))
934 goto err;
935 s->session->session_id_length = outlen;
936
937 s->session->ssl_version = s->version;
938 }
939
940 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) {
941 al = SSL_AD_ILLEGAL_PARAMETER;
942 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED);
943 goto f_err;
944 }
945
946 /* TLS v1.2 only ciphersuites require v1.2 or later. */
947 if ((cipher->algorithm_ssl & SSL_TLSV1_2) &&
948 (TLS1_get_version(s) < TLS1_2_VERSION)) {
949 al = SSL_AD_ILLEGAL_PARAMETER;
950 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED);
951 goto f_err;
952 }
953
954 sk = ssl_get_ciphers_by_id(s);
955 i = sk_SSL_CIPHER_find(sk, cipher);
956 if (i < 0) {
957 /* we did not say we would use this cipher */
958 al = SSL_AD_ILLEGAL_PARAMETER;
959 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED);
960 goto f_err;
961 }
962
963 /*
964 * Depending on the session caching (internal/external), the cipher
965 * and/or cipher_id values may not be set. Make sure that
966 * cipher_id is set and use it for comparison.
967 */
968 if (s->session->cipher)
969 s->session->cipher_id = s->session->cipher->id;
970 if (s->internal->hit && (s->session->cipher_id != cipher->id)) {
971 al = SSL_AD_ILLEGAL_PARAMETER;
972 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
973 goto f_err;
974 }
975 S3I(s)->hs.new_cipher = cipher;
976
977 if (!tls1_handshake_hash_init(s))
978 goto err;
979
980 /*
981 * Don't digest cached records if no sigalgs: we may need them for
982 * client authentication.
983 */
984 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
985 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) &&
986 !tls1_digest_cached_records(s)) {
987 al = SSL_AD_INTERNAL_ERROR;
988 goto f_err;
989 }
990
991 if (!CBS_get_u8(&cbs, &compression_method))
992 goto truncated;
993
994 if (compression_method != 0) {
995 al = SSL_AD_ILLEGAL_PARAMETER;
996 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
997 goto f_err;
998 }
999
1000 if (!tlsext_serverhello_parse(s, &cbs, &al)) {
1001 SSLerror(s, SSL_R_PARSE_TLSEXT);
1002 goto f_err;
1003 }
1004
1005 /*
1006 * Determine if we need to see RI. Strictly speaking if we want to
1007 * avoid an attack we should *always* see RI even on initial server
1008 * hello because the client doesn't see any renegotiation during an
1009 * attack. However this would mean we could not connect to any server
1010 * which doesn't support RI so for the immediate future tolerate RI
1011 * absence on initial connect only.
1012 */
1013 if (!S3I(s)->renegotiate_seen &&
1014 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) {
1015 al = SSL_AD_HANDSHAKE_FAILURE;
1016 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1017 goto f_err;
1018 }
1019
1020 if (ssl_check_serverhello_tlsext(s) <= 0) {
1021 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT);
1022 goto err;
1023 }
1024
1025 return (1);
1026
1027 truncated:
1028 /* wrong packet length */
1029 al = SSL_AD_DECODE_ERROR;
1030 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1031 f_err:
1032 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1033 err:
1034 return (-1);
1035 }
1036
1037 int
1038 ssl3_get_server_certificate(SSL *s)
1039 {
1040 int al, i, ok, ret = -1;
1041 long n;
1042 CBS cbs, cert_list;
1043 X509 *x = NULL;
1044 const unsigned char *q;
1045 STACK_OF(X509) *sk = NULL;
1046 SESS_CERT *sc;
1047 EVP_PKEY *pkey = NULL;
1048
1049 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A,
1050 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok);
1051
1052 if (!ok)
1053 return ((int)n);
1054
1055 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) {
1056 S3I(s)->tmp.reuse_message = 1;
1057 return (1);
1058 }
1059
1060 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) {
1061 al = SSL_AD_UNEXPECTED_MESSAGE;
1062 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
1063 goto f_err;
1064 }
1065
1066
1067 if ((sk = sk_X509_new_null()) == NULL) {
1068 SSLerror(s, ERR_R_MALLOC_FAILURE);
1069 goto err;
1070 }
1071
1072 if (n < 0)
1073 goto truncated;
1074
1075 CBS_init(&cbs, s->internal->init_msg, n);
1076 if (CBS_len(&cbs) < 3)
1077 goto truncated;
1078
1079 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) ||
1080 CBS_len(&cbs) != 0) {
1081 al = SSL_AD_DECODE_ERROR;
1082 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1083 goto f_err;
1084 }
1085
1086 while (CBS_len(&cert_list) > 0) {
1087 CBS cert;
1088
1089 if (CBS_len(&cert_list) < 3)
1090 goto truncated;
1091 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) {
1092 al = SSL_AD_DECODE_ERROR;
1093 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
1094 goto f_err;
1095 }
1096
1097 q = CBS_data(&cert);
1098 x = d2i_X509(NULL, &q, CBS_len(&cert));
1099 if (x == NULL) {
1100 al = SSL_AD_BAD_CERTIFICATE;
1101 SSLerror(s, ERR_R_ASN1_LIB);
1102 goto f_err;
1103 }
1104 if (q != CBS_data(&cert) + CBS_len(&cert)) {
1105 al = SSL_AD_DECODE_ERROR;
1106 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH);
1107 goto f_err;
1108 }
1109 if (!sk_X509_push(sk, x)) {
1110 SSLerror(s, ERR_R_MALLOC_FAILURE);
1111 goto err;
1112 }
1113 x = NULL;
1114 }
1115
1116 i = ssl_verify_cert_chain(s, sk);
1117 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) {
1118 al = ssl_verify_alarm_type(s->verify_result);
1119 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED);
1120 goto f_err;
1121
1122 }
1123 ERR_clear_error(); /* but we keep s->verify_result */
1124
1125 sc = ssl_sess_cert_new();
1126 if (sc == NULL)
1127 goto err;
1128 ssl_sess_cert_free(SSI(s)->sess_cert);
1129 SSI(s)->sess_cert = sc;
1130
1131 sc->cert_chain = sk;
1132 /*
1133 * Inconsistency alert: cert_chain does include the peer's
1134 * certificate, which we don't include in s3_srvr.c
1135 */
1136 x = sk_X509_value(sk, 0);
1137 sk = NULL;
1138 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1139
1140 pkey = X509_get_pubkey(x);
1141
1142 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
1143 x = NULL;
1144 al = SSL3_AL_FATAL;
1145 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1146 goto f_err;
1147 }
1148
1149 i = ssl_cert_type(x, pkey);
1150 if (i < 0) {
1151 x = NULL;
1152 al = SSL3_AL_FATAL;
1153 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1154 goto f_err;
1155 }
1156
1157 sc->peer_cert_type = i;
1158 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1159 /*
1160 * Why would the following ever happen?
1161 * We just created sc a couple of lines ago.
1162 */
1163 X509_free(sc->peer_pkeys[i].x509);
1164 sc->peer_pkeys[i].x509 = x;
1165 sc->peer_key = &(sc->peer_pkeys[i]);
1166
1167 X509_free(s->session->peer);
1168 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1169 s->session->peer = x;
1170 s->session->verify_result = s->verify_result;
1171
1172 x = NULL;
1173 ret = 1;
1174
1175 if (0) {
1176 truncated:
1177 /* wrong packet length */
1178 al = SSL_AD_DECODE_ERROR;
1179 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1180 f_err:
1181 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1182 }
1183 err:
1184 EVP_PKEY_free(pkey);
1185 X509_free(x);
1186 sk_X509_pop_free(sk, X509_free);
1187
1188 return (ret);
1189 }
1190
1191 static int
1192 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs)
1193 {
1194 CBS dhp, dhg, dhpk;
1195 BN_CTX *bn_ctx = NULL;
1196 SESS_CERT *sc = NULL;
1197 DH *dh = NULL;
1198 long alg_a;
1199 int al;
1200
1201 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1202 sc = SSI(s)->sess_cert;
1203
1204 if ((dh = DH_new()) == NULL) {
1205 SSLerror(s, ERR_R_DH_LIB);
1206 goto err;
1207 }
1208
1209 if (!CBS_get_u16_length_prefixed(cbs, &dhp))
1210 goto truncated;
1211 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) {
1212 SSLerror(s, ERR_R_BN_LIB);
1213 goto err;
1214 }
1215
1216 if (!CBS_get_u16_length_prefixed(cbs, &dhg))
1217 goto truncated;
1218 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) {
1219 SSLerror(s, ERR_R_BN_LIB);
1220 goto err;
1221 }
1222
1223 if (!CBS_get_u16_length_prefixed(cbs, &dhpk))
1224 goto truncated;
1225 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk),
1226 NULL)) == NULL) {
1227 SSLerror(s, ERR_R_BN_LIB);
1228 goto err;
1229 }
1230
1231 /*
1232 * Check the strength of the DH key just constructed.
1233 * Discard keys weaker than 1024 bits.
1234 */
1235 if (DH_size(dh) < 1024 / 8) {
1236 SSLerror(s, SSL_R_BAD_DH_P_LENGTH);
1237 goto err;
1238 }
1239
1240 if (alg_a & SSL_aRSA)
1241 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1242 else
1243 /* XXX - Anonymous DH, so no certificate or pkey. */
1244 *pkey = NULL;
1245
1246 sc->peer_dh_tmp = dh;
1247
1248 return (1);
1249
1250 truncated:
1251 al = SSL_AD_DECODE_ERROR;
1252 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1253 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1254
1255 err:
1256 DH_free(dh);
1257 BN_CTX_free(bn_ctx);
1258
1259 return (-1);
1260 }
1261
1262 static int
1263 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public)
1264 {
1265 const EC_GROUP *group;
1266 EC_GROUP *ngroup = NULL;
1267 EC_POINT *point = NULL;
1268 BN_CTX *bn_ctx = NULL;
1269 EC_KEY *ecdh = NULL;
1270 int ret = -1;
1271
1272 /*
1273 * Extract the server's ephemeral ECDH public key.
1274 */
1275
1276 if ((ecdh = EC_KEY_new()) == NULL) {
1277 SSLerror(s, ERR_R_MALLOC_FAILURE);
1278 goto err;
1279 }
1280
1281 if ((ngroup = EC_GROUP_new_by_curve_name(nid)) == NULL) {
1282 SSLerror(s, ERR_R_EC_LIB);
1283 goto err;
1284 }
1285 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1286 SSLerror(s, ERR_R_EC_LIB);
1287 goto err;
1288 }
1289
1290 group = EC_KEY_get0_group(ecdh);
1291
1292 if ((point = EC_POINT_new(group)) == NULL ||
1293 (bn_ctx = BN_CTX_new()) == NULL) {
1294 SSLerror(s, ERR_R_MALLOC_FAILURE);
1295 goto err;
1296 }
1297
1298 if (EC_POINT_oct2point(group, point, CBS_data(public),
1299 CBS_len(public), bn_ctx) == 0) {
1300 SSLerror(s, SSL_R_BAD_ECPOINT);
1301 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1302 goto err;
1303 }
1304
1305 EC_KEY_set_public_key(ecdh, point);
1306 sc->peer_ecdh_tmp = ecdh;
1307 ecdh = NULL;
1308
1309 ret = 1;
1310
1311 err:
1312 BN_CTX_free(bn_ctx);
1313 EC_GROUP_free(ngroup);
1314 EC_POINT_free(point);
1315 EC_KEY_free(ecdh);
1316
1317 return (ret);
1318 }
1319
1320 static int
1321 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public)
1322 {
1323 size_t outlen;
1324
1325 if (nid != NID_X25519) {
1326 SSLerror(s, ERR_R_INTERNAL_ERROR);
1327 goto err;
1328 }
1329
1330 if (CBS_len(public) != X25519_KEY_LENGTH) {
1331 SSLerror(s, SSL_R_BAD_ECPOINT);
1332 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1333 goto err;
1334 }
1335
1336 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) {
1337 SSLerror(s, ERR_R_MALLOC_FAILURE);
1338 goto err;
1339 }
1340
1341 return (1);
1342
1343 err:
1344 return (-1);
1345 }
1346
1347 static int
1348 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs)
1349 {
1350 CBS public;
1351 uint8_t curve_type;
1352 uint16_t curve_id;
1353 SESS_CERT *sc;
1354 long alg_a;
1355 int nid;
1356 int al;
1357
1358 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1359 sc = SSI(s)->sess_cert;
1360
1361 /* Only named curves are supported. */
1362 if (!CBS_get_u8(cbs, &curve_type) ||
1363 curve_type != NAMED_CURVE_TYPE ||
1364 !CBS_get_u16(cbs, &curve_id)) {
1365 al = SSL_AD_DECODE_ERROR;
1366 SSLerror(s, SSL_R_LENGTH_TOO_SHORT);
1367 goto f_err;
1368 }
1369
1370 /*
1371 * Check that the curve is one of our preferences - if it is not,
1372 * the server has sent us an invalid curve.
1373 */
1374 if (tls1_check_curve(s, curve_id) != 1) {
1375 al = SSL_AD_DECODE_ERROR;
1376 SSLerror(s, SSL_R_WRONG_CURVE);
1377 goto f_err;
1378 }
1379
1380 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) {
1381 al = SSL_AD_INTERNAL_ERROR;
1382 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1383 goto f_err;
1384 }
1385
1386 if (!CBS_get_u8_length_prefixed(cbs, &public))
1387 goto truncated;
1388
1389 if (nid == NID_X25519) {
1390 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1)
1391 goto err;
1392 } else {
1393 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1)
1394 goto err;
1395 }
1396
1397 /*
1398 * The ECC/TLS specification does not mention the use of DSA to sign
1399 * ECParameters in the server key exchange message. We do support RSA
1400 * and ECDSA.
1401 */
1402 if (alg_a & SSL_aRSA)
1403 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1404 else if (alg_a & SSL_aECDSA)
1405 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509);
1406 else
1407 /* XXX - Anonymous ECDH, so no certificate or pkey. */
1408 *pkey = NULL;
1409
1410 return (1);
1411
1412 truncated:
1413 al = SSL_AD_DECODE_ERROR;
1414 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1415
1416 f_err:
1417 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1418
1419 err:
1420 return (-1);
1421 }
1422
1423 int
1424 ssl3_get_server_key_exchange(SSL *s)
1425 {
1426 CBS cbs, signature;
1427 const EVP_MD *md = NULL;
1428 EVP_PKEY *pkey = NULL;
1429 EVP_MD_CTX md_ctx;
1430 const unsigned char *param;
1431 uint8_t hash_id, sig_id;
1432 long n, alg_k, alg_a;
1433 int al, ok, sigalg;
1434 size_t param_len;
1435
1436 EVP_MD_CTX_init(&md_ctx);
1437
1438 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
1439 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
1440
1441 /*
1442 * Use same message size as in ssl3_get_certificate_request()
1443 * as ServerKeyExchange message may be skipped.
1444 */
1445 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A,
1446 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok);
1447 if (!ok)
1448 return ((int)n);
1449
1450 if (n < 0)
1451 goto err;
1452
1453 CBS_init(&cbs, s->internal->init_msg, n);
1454
1455 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1456 /*
1457 * Do not skip server key exchange if this cipher suite uses
1458 * ephemeral keys.
1459 */
1460 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
1461 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
1462 al = SSL_AD_UNEXPECTED_MESSAGE;
1463 goto f_err;
1464 }
1465
1466 S3I(s)->tmp.reuse_message = 1;
1467 EVP_MD_CTX_cleanup(&md_ctx);
1468 return (1);
1469 }
1470
1471 if (SSI(s)->sess_cert != NULL) {
1472 DH_free(SSI(s)->sess_cert->peer_dh_tmp);
1473 SSI(s)->sess_cert->peer_dh_tmp = NULL;
1474
1475 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp);
1476 SSI(s)->sess_cert->peer_ecdh_tmp = NULL;
1477
1478 free(SSI(s)->sess_cert->peer_x25519_tmp);
1479 SSI(s)->sess_cert->peer_x25519_tmp = NULL;
1480 } else {
1481 SSI(s)->sess_cert = ssl_sess_cert_new();
1482 if (SSI(s)->sess_cert == NULL)
1483 goto err;
1484 }
1485
1486 param = CBS_data(&cbs);
1487 param_len = CBS_len(&cbs);
1488
1489 if (alg_k & SSL_kDHE) {
1490 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1)
1491 goto err;
1492 } else if (alg_k & SSL_kECDHE) {
1493 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1)
1494 goto err;
1495 } else if (alg_k != 0) {
1496 al = SSL_AD_UNEXPECTED_MESSAGE;
1497 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
1498 goto f_err;
1499 }
1500
1501 param_len -= CBS_len(&cbs);
1502
1503 /* if it was signed, check the signature */
1504 if (pkey != NULL) {
1505 if (SSL_USE_SIGALGS(s)) {
1506 if (!CBS_get_u8(&cbs, &hash_id))
1507 goto truncated;
1508 if (!CBS_get_u8(&cbs, &sig_id))
1509 goto truncated;
1510
1511 if ((md = tls12_get_hash(hash_id)) == NULL) {
1512 SSLerror(s, SSL_R_UNKNOWN_DIGEST);
1513 al = SSL_AD_DECODE_ERROR;
1514 goto f_err;
1515 }
1516
1517 /* Check key type is consistent with signature. */
1518 if ((sigalg = tls12_get_sigid(pkey)) == -1) {
1519 /* Should never happen */
1520 SSLerror(s, ERR_R_INTERNAL_ERROR);
1521 goto err;
1522 }
1523 if (sigalg != sig_id) {
1524 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE);
1525 al = SSL_AD_DECODE_ERROR;
1526 goto f_err;
1527 }
1528 } else if (pkey->type == EVP_PKEY_RSA) {
1529 md = EVP_md5_sha1();
1530 } else {
1531 md = EVP_sha1();
1532 }
1533
1534 if (!CBS_get_u16_length_prefixed(&cbs, &signature))
1535 goto truncated;
1536 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) {
1537 al = SSL_AD_DECODE_ERROR;
1538 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH);
1539 goto f_err;
1540 }
1541
1542 if (!EVP_VerifyInit_ex(&md_ctx, md, NULL))
1543 goto err;
1544 if (!EVP_VerifyUpdate(&md_ctx, s->s3->client_random,
1545 SSL3_RANDOM_SIZE))
1546 goto err;
1547 if (!EVP_VerifyUpdate(&md_ctx, s->s3->server_random,
1548 SSL3_RANDOM_SIZE))
1549 goto err;
1550 if (!EVP_VerifyUpdate(&md_ctx, param, param_len))
1551 goto err;
1552 if (EVP_VerifyFinal(&md_ctx, CBS_data(&signature),
1553 CBS_len(&signature), pkey) <= 0) {
1554 al = SSL_AD_DECRYPT_ERROR;
1555 SSLerror(s, SSL_R_BAD_SIGNATURE);
1556 goto f_err;
1557 }
1558 } else {
1559 /* aNULL does not need public keys. */
1560 if (!(alg_a & SSL_aNULL)) {
1561 SSLerror(s, ERR_R_INTERNAL_ERROR);
1562 goto err;
1563 }
1564 }
1565
1566 if (CBS_len(&cbs) != 0) {
1567 al = SSL_AD_DECODE_ERROR;
1568 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE);
1569 goto f_err;
1570 }
1571
1572 EVP_PKEY_free(pkey);
1573 EVP_MD_CTX_cleanup(&md_ctx);
1574
1575 return (1);
1576
1577 truncated:
1578 al = SSL_AD_DECODE_ERROR;
1579 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1580
1581 f_err:
1582 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1583
1584 err:
1585 EVP_PKEY_free(pkey);
1586 EVP_MD_CTX_cleanup(&md_ctx);
1587
1588 return (-1);
1589 }
1590
1591 int
1592 ssl3_get_certificate_request(SSL *s)
1593 {
1594 int ok, ret = 0;
1595 long n;
1596 uint8_t ctype_num;
1597 CBS cert_request, ctypes, rdn_list;
1598 X509_NAME *xn = NULL;
1599 const unsigned char *q;
1600 STACK_OF(X509_NAME) *ca_sk = NULL;
1601
1602 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A,
1603 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok);
1604
1605 if (!ok)
1606 return ((int)n);
1607
1608 S3I(s)->tmp.cert_req = 0;
1609
1610 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) {
1611 S3I(s)->tmp.reuse_message = 1;
1612 /*
1613 * If we get here we don't need any cached handshake records
1614 * as we wont be doing client auth.
1615 */
1616 if (S3I(s)->handshake_buffer) {
1617 if (!tls1_digest_cached_records(s))
1618 goto err;
1619 }
1620 return (1);
1621 }
1622
1623 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
1624 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1625 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE);
1626 goto err;
1627 }
1628
1629 /* TLS does not like anon-DH with client cert */
1630 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) {
1631 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1632 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1633 goto err;
1634 }
1635
1636 if (n < 0)
1637 goto truncated;
1638 CBS_init(&cert_request, s->internal->init_msg, n);
1639
1640 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
1641 SSLerror(s, ERR_R_MALLOC_FAILURE);
1642 goto err;
1643 }
1644
1645 /* get the certificate types */
1646 if (!CBS_get_u8(&cert_request, &ctype_num))
1647 goto truncated;
1648
1649 if (ctype_num > SSL3_CT_NUMBER)
1650 ctype_num = SSL3_CT_NUMBER;
1651 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) ||
1652 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype,
1653 sizeof(S3I(s)->tmp.ctype), NULL)) {
1654 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1655 goto err;
1656 }
1657
1658 if (SSL_USE_SIGALGS(s)) {
1659 CBS sigalgs;
1660
1661 if (CBS_len(&cert_request) < 2) {
1662 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1663 goto err;
1664 }
1665
1666 /* Check we have enough room for signature algorithms and
1667 * following length value.
1668 */
1669 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) {
1670 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1671 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1672 goto err;
1673 }
1674 if (!tls1_process_sigalgs(s, &sigalgs)) {
1675 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1676 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1677 goto err;
1678 }
1679 }
1680
1681 /* get the CA RDNs */
1682 if (CBS_len(&cert_request) < 2) {
1683 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1684 goto err;
1685 }
1686
1687 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) ||
1688 CBS_len(&cert_request) != 0) {
1689 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1690 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1691 goto err;
1692 }
1693
1694 while (CBS_len(&rdn_list) > 0) {
1695 CBS rdn;
1696
1697 if (CBS_len(&rdn_list) < 2) {
1698 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG);
1699 goto err;
1700 }
1701
1702 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) {
1703 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1704 SSLerror(s, SSL_R_CA_DN_TOO_LONG);
1705 goto err;
1706 }
1707
1708 q = CBS_data(&rdn);
1709 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) {
1710 ssl3_send_alert(s, SSL3_AL_FATAL,
1711 SSL_AD_DECODE_ERROR);
1712 SSLerror(s, ERR_R_ASN1_LIB);
1713 goto err;
1714 }
1715
1716 if (q != CBS_data(&rdn) + CBS_len(&rdn)) {
1717 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1718 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH);
1719 goto err;
1720 }
1721 if (!sk_X509_NAME_push(ca_sk, xn)) {
1722 SSLerror(s, ERR_R_MALLOC_FAILURE);
1723 goto err;
1724 }
1725 xn = NULL; /* avoid free in err block */
1726 }
1727
1728 /* we should setup a certificate to return.... */
1729 S3I(s)->tmp.cert_req = 1;
1730 S3I(s)->tmp.ctype_num = ctype_num;
1731 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free);
1732 S3I(s)->tmp.ca_names = ca_sk;
1733 ca_sk = NULL;
1734
1735 ret = 1;
1736 if (0) {
1737 truncated:
1738 SSLerror(s, SSL_R_BAD_PACKET_LENGTH);
1739 }
1740 err:
1741 X509_NAME_free(xn);
1742 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
1743 return (ret);
1744 }
1745
1746 static int
1747 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1748 {
1749 return (X509_NAME_cmp(*a, *b));
1750 }
1751
1752 int
1753 ssl3_get_new_session_ticket(SSL *s)
1754 {
1755 int ok, al, ret = 0;
1756 uint32_t lifetime_hint;
1757 long n;
1758 CBS cbs, session_ticket;
1759
1760 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A,
1761 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok);
1762 if (!ok)
1763 return ((int)n);
1764
1765 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) {
1766 S3I(s)->tmp.reuse_message = 1;
1767 return (1);
1768 }
1769 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) {
1770 al = SSL_AD_UNEXPECTED_MESSAGE;
1771 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE);
1772 goto f_err;
1773 }
1774
1775 if (n < 0) {
1776 al = SSL_AD_DECODE_ERROR;
1777 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1778 goto f_err;
1779 }
1780
1781 CBS_init(&cbs, s->internal->init_msg, n);
1782 if (!CBS_get_u32(&cbs, &lifetime_hint) ||
1783 #if UINT32_MAX > LONG_MAX
1784 lifetime_hint > LONG_MAX ||
1785 #endif
1786 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) ||
1787 CBS_len(&cbs) != 0) {
1788 al = SSL_AD_DECODE_ERROR;
1789 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1790 goto f_err;
1791 }
1792 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint;
1793
1794 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick,
1795 &s->session->tlsext_ticklen)) {
1796 SSLerror(s, ERR_R_MALLOC_FAILURE);
1797 goto err;
1798 }
1799
1800 /*
1801 * There are two ways to detect a resumed ticket sesion.
1802 * One is to set an appropriate session ID and then the server
1803 * must return a match in ServerHello. This allows the normal
1804 * client session ID matching to work and we know much
1805 * earlier that the ticket has been accepted.
1806 *
1807 * The other way is to set zero length session ID when the
1808 * ticket is presented and rely on the handshake to determine
1809 * session resumption.
1810 *
1811 * We choose the former approach because this fits in with
1812 * assumptions elsewhere in OpenSSL. The session ID is set
1813 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1814 * ticket.
1815 */
1816 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket),
1817 s->session->session_id, &s->session->session_id_length,
1818 EVP_sha256(), NULL);
1819 ret = 1;
1820 return (ret);
1821 f_err:
1822 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1823 err:
1824 return (-1);
1825 }
1826
1827 int
1828 ssl3_get_cert_status(SSL *s)
1829 {
1830 CBS cert_status, response;
1831 size_t stow_len;
1832 int ok, al;
1833 long n;
1834 uint8_t status_type;
1835
1836 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A,
1837 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS,
1838 16384, &ok);
1839
1840 if (!ok)
1841 return ((int)n);
1842
1843 if (n < 0) {
1844 /* need at least status type + length */
1845 al = SSL_AD_DECODE_ERROR;
1846 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1847 goto f_err;
1848 }
1849
1850 CBS_init(&cert_status, s->internal->init_msg, n);
1851 if (!CBS_get_u8(&cert_status, &status_type) ||
1852 CBS_len(&cert_status) < 3) {
1853 /* need at least status type + length */
1854 al = SSL_AD_DECODE_ERROR;
1855 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1856 goto f_err;
1857 }
1858
1859 if (status_type != TLSEXT_STATUSTYPE_ocsp) {
1860 al = SSL_AD_DECODE_ERROR;
1861 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE);
1862 goto f_err;
1863 }
1864
1865 if (!CBS_get_u24_length_prefixed(&cert_status, &response) ||
1866 CBS_len(&cert_status) != 0) {
1867 al = SSL_AD_DECODE_ERROR;
1868 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1869 goto f_err;
1870 }
1871
1872 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp,
1873 &stow_len) || stow_len > INT_MAX) {
1874 s->internal->tlsext_ocsp_resplen = 0;
1875 al = SSL_AD_INTERNAL_ERROR;
1876 SSLerror(s, ERR_R_MALLOC_FAILURE);
1877 goto f_err;
1878 }
1879 s->internal->tlsext_ocsp_resplen = (int)stow_len;
1880
1881 if (s->ctx->internal->tlsext_status_cb) {
1882 int ret;
1883 ret = s->ctx->internal->tlsext_status_cb(s,
1884 s->ctx->internal->tlsext_status_arg);
1885 if (ret == 0) {
1886 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1887 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE);
1888 goto f_err;
1889 }
1890 if (ret < 0) {
1891 al = SSL_AD_INTERNAL_ERROR;
1892 SSLerror(s, ERR_R_MALLOC_FAILURE);
1893 goto f_err;
1894 }
1895 }
1896 return (1);
1897 f_err:
1898 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1899 return (-1);
1900 }
1901
1902 int
1903 ssl3_get_server_done(SSL *s)
1904 {
1905 int ok, ret = 0;
1906 long n;
1907
1908 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A,
1909 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE,
1910 30, /* should be very small, like 0 :-) */ &ok);
1911
1912 if (!ok)
1913 return ((int)n);
1914 if (n > 0) {
1915 /* should contain no data */
1916 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1917 SSLerror(s, SSL_R_LENGTH_MISMATCH);
1918 return (-1);
1919 }
1920 ret = 1;
1921 return (ret);
1922 }
1923
1924 static int
1925 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
1926 {
1927 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH];
1928 unsigned char *enc_pms = NULL;
1929 EVP_PKEY *pkey = NULL;
1930 int ret = -1;
1931 int enc_len;
1932 CBB epms;
1933
1934 /*
1935 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1.
1936 */
1937
1938 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1939 if (pkey == NULL || pkey->type != EVP_PKEY_RSA ||
1940 pkey->pkey.rsa == NULL) {
1941 SSLerror(s, ERR_R_INTERNAL_ERROR);
1942 goto err;
1943 }
1944
1945 pms[0] = s->client_version >> 8;
1946 pms[1] = s->client_version & 0xff;
1947 arc4random_buf(&pms[2], sizeof(pms) - 2);
1948
1949 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) {
1950 SSLerror(s, ERR_R_MALLOC_FAILURE);
1951 goto err;
1952 }
1953
1954 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa,
1955 RSA_PKCS1_PADDING);
1956 if (enc_len <= 0) {
1957 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT);
1958 goto err;
1959 }
1960
1961 if (!CBB_add_u16_length_prefixed(cbb, &epms))
1962 goto err;
1963 if (!CBB_add_bytes(&epms, enc_pms, enc_len))
1964 goto err;
1965 if (!CBB_flush(cbb))
1966 goto err;
1967
1968 s->session->master_key_length =
1969 tls1_generate_master_secret(s,
1970 s->session->master_key, pms, sizeof(pms));
1971
1972 ret = 1;
1973
1974 err:
1975 explicit_bzero(pms, sizeof(pms));
1976 EVP_PKEY_free(pkey);
1977 free(enc_pms);
1978
1979 return (ret);
1980 }
1981
1982 static int
1983 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
1984 {
1985 DH *dh_srvr = NULL, *dh_clnt = NULL;
1986 unsigned char *key = NULL;
1987 int key_size = 0, key_len;
1988 unsigned char *data;
1989 int ret = -1;
1990 CBB dh_Yc;
1991
1992 /* Ensure that we have an ephemeral key for DHE. */
1993 if (sess_cert->peer_dh_tmp == NULL) {
1994 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1995 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1996 goto err;
1997 }
1998 dh_srvr = sess_cert->peer_dh_tmp;
1999
2000 /* Generate a new random key. */
2001 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2002 SSLerror(s, ERR_R_DH_LIB);
2003 goto err;
2004 }
2005 if (!DH_generate_key(dh_clnt)) {
2006 SSLerror(s, ERR_R_DH_LIB);
2007 goto err;
2008 }
2009 if ((key_size = DH_size(dh_clnt)) <= 0) {
2010 SSLerror(s, ERR_R_DH_LIB);
2011 goto err;
2012 }
2013 if ((key = malloc(key_size)) == NULL) {
2014 SSLerror(s, ERR_R_MALLOC_FAILURE);
2015 goto err;
2016 }
2017 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) {
2018 SSLerror(s, ERR_R_DH_LIB);
2019 goto err;
2020 }
2021
2022 /* Generate master key from the result. */
2023 s->session->master_key_length =
2024 tls1_generate_master_secret(s,
2025 s->session->master_key, key, key_len);
2026
2027 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc))
2028 goto err;
2029 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key)))
2030 goto err;
2031 BN_bn2bin(dh_clnt->pub_key, data);
2032 if (!CBB_flush(cbb))
2033 goto err;
2034
2035 ret = 1;
2036
2037 err:
2038 DH_free(dh_clnt);
2039 freezero(key, key_size);
2040
2041 return (ret);
2042 }
2043
2044 static int
2045 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb)
2046 {
2047 const EC_GROUP *group = NULL;
2048 const EC_POINT *point = NULL;
2049 EC_KEY *ecdh = NULL;
2050 BN_CTX *bn_ctx = NULL;
2051 unsigned char *key = NULL;
2052 unsigned char *data;
2053 size_t encoded_len;
2054 int key_size = 0, key_len;
2055 int ret = -1;
2056 CBB ecpoint;
2057
2058 if ((group = EC_KEY_get0_group(sc->peer_ecdh_tmp)) == NULL ||
2059 (point = EC_KEY_get0_public_key(sc->peer_ecdh_tmp)) == NULL) {
2060 SSLerror(s, ERR_R_INTERNAL_ERROR);
2061 goto err;
2062 }
2063
2064 if ((ecdh = EC_KEY_new()) == NULL) {
2065 SSLerror(s, ERR_R_MALLOC_FAILURE);
2066 goto err;
2067 }
2068
2069 if (!EC_KEY_set_group(ecdh, group)) {
2070 SSLerror(s, ERR_R_EC_LIB);
2071 goto err;
2072 }
2073
2074 /* Generate a new ECDH key pair. */
2075 if (!EC_KEY_generate_key(ecdh)) {
2076 SSLerror(s, ERR_R_ECDH_LIB);
2077 goto err;
2078 }
2079 if ((key_size = ECDH_size(ecdh)) <= 0) {
2080 SSLerror(s, ERR_R_ECDH_LIB);
2081 goto err;
2082 }
2083 if ((key = malloc(key_size)) == NULL) {
2084 SSLerror(s, ERR_R_MALLOC_FAILURE);
2085 goto err;
2086 }
2087 key_len = ECDH_compute_key(key, key_size, point, ecdh, NULL);
2088 if (key_len <= 0) {
2089 SSLerror(s, ERR_R_ECDH_LIB);
2090 goto err;
2091 }
2092
2093 /* Generate master key from the result. */
2094 s->session->master_key_length =
2095 tls1_generate_master_secret(s,
2096 s->session->master_key, key, key_len);
2097
2098 encoded_len = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh),
2099 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL);
2100 if (encoded_len == 0) {
2101 SSLerror(s, ERR_R_ECDH_LIB);
2102 goto err;
2103 }
2104
2105 if ((bn_ctx = BN_CTX_new()) == NULL) {
2106 SSLerror(s, ERR_R_MALLOC_FAILURE);
2107 goto err;
2108 }
2109
2110 /* Encode the public key. */
2111 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
2112 goto err;
2113 if (!CBB_add_space(&ecpoint, &data, encoded_len))
2114 goto err;
2115 if (EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh),
2116 POINT_CONVERSION_UNCOMPRESSED, data, encoded_len,
2117 bn_ctx) == 0)
2118 goto err;
2119 if (!CBB_flush(cbb))
2120 goto err;
2121
2122 ret = 1;
2123
2124 err:
2125 freezero(key, key_size);
2126
2127 BN_CTX_free(bn_ctx);
2128 EC_KEY_free(ecdh);
2129
2130 return (ret);
2131 }
2132
2133 static int
2134 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb)
2135 {
2136 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL;
2137 int ret = -1;
2138 CBB ecpoint;
2139
2140 /* Generate X25519 key pair and derive shared key. */
2141 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL)
2142 goto err;
2143 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL)
2144 goto err;
2145 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL)
2146 goto err;
2147 X25519_keypair(public_key, private_key);
2148 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp))
2149 goto err;
2150
2151 /* Serialize the public key. */
2152 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint))
2153 goto err;
2154 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH))
2155 goto err;
2156 if (!CBB_flush(cbb))
2157 goto err;
2158
2159 /* Generate master key from the result. */
2160 s->session->master_key_length =
2161 tls1_generate_master_secret(s,
2162 s->session->master_key, shared_key, X25519_KEY_LENGTH);
2163
2164 ret = 1;
2165
2166 err:
2167 free(public_key);
2168 freezero(private_key, X25519_KEY_LENGTH);
2169 freezero(shared_key, X25519_KEY_LENGTH);
2170
2171 return (ret);
2172 }
2173
2174 static int
2175 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb)
2176 {
2177 if (sc->peer_x25519_tmp != NULL) {
2178 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1)
2179 goto err;
2180 } else if (sc->peer_ecdh_tmp != NULL) {
2181 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1)
2182 goto err;
2183 } else {
2184 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2185 SSLerror(s, ERR_R_INTERNAL_ERROR);
2186 goto err;
2187 }
2188
2189 return (1);
2190
2191 err:
2192 return (-1);
2193 }
2194
2195 static int
2196 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb)
2197 {
2198 unsigned char premaster_secret[32], shared_ukm[32], tmp[256];
2199 EVP_PKEY *pub_key = NULL;
2200 EVP_PKEY_CTX *pkey_ctx;
2201 X509 *peer_cert;
2202 size_t msglen;
2203 unsigned int md_len;
2204 EVP_MD_CTX *ukm_hash;
2205 int ret = -1;
2206 int nid;
2207 CBB gostblob;
2208
2209 /* Get server sertificate PKEY and create ctx from it */
2210 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509;
2211 if (peer_cert == NULL) {
2212 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2213 goto err;
2214 }
2215
2216 pub_key = X509_get_pubkey(peer_cert);
2217 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL);
2218
2219 /*
2220 * If we have send a certificate, and certificate key parameters match
2221 * those of server certificate, use certificate key for key exchange.
2222 * Otherwise, generate ephemeral key pair.
2223 */
2224 EVP_PKEY_encrypt_init(pkey_ctx);
2225
2226 /* Generate session key. */
2227 arc4random_buf(premaster_secret, 32);
2228
2229 /*
2230 * If we have client certificate, use its secret as peer key.
2231 */
2232 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) {
2233 if (EVP_PKEY_derive_set_peer(pkey_ctx,
2234 s->cert->key->privatekey) <=0) {
2235 /*
2236 * If there was an error - just ignore it.
2237 * Ephemeral key would be used.
2238 */
2239 ERR_clear_error();
2240 }
2241 }
2242
2243 /*
2244 * Compute shared IV and store it in algorithm-specific context data.
2245 */
2246 ukm_hash = EVP_MD_CTX_new();
2247 if (ukm_hash == NULL) {
2248 SSLerror(s, ERR_R_MALLOC_FAILURE);
2249 goto err;
2250 }
2251
2252 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94)
2253 nid = NID_id_GostR3411_94;
2254 else
2255 nid = NID_id_tc26_gost3411_2012_256;
2256 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid)))
2257 goto err;
2258 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE);
2259 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE);
2260 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2261 EVP_MD_CTX_free(ukm_hash);
2262 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
2263 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) {
2264 SSLerror(s, SSL_R_LIBRARY_BUG);
2265 goto err;
2266 }
2267
2268 /*
2269 * Make GOST keytransport blob message, encapsulate it into sequence.
2270 */
2271 msglen = 255;
2272 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret,
2273 32) < 0) {
2274 SSLerror(s, SSL_R_LIBRARY_BUG);
2275 goto err;
2276 }
2277
2278 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE))
2279 goto err;
2280 if (!CBB_add_bytes(&gostblob, tmp, msglen))
2281 goto err;
2282 if (!CBB_flush(cbb))
2283 goto err;
2284
2285 /* Check if pubkey from client certificate was used. */
2286 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2,
2287 NULL) > 0) {
2288 /* Set flag "skip certificate verify". */
2289 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2290 }
2291 EVP_PKEY_CTX_free(pkey_ctx);
2292 s->session->master_key_length =
2293 tls1_generate_master_secret(s,
2294 s->session->master_key, premaster_secret, 32);
2295
2296 ret = 1;
2297
2298 err:
2299 explicit_bzero(premaster_secret, sizeof(premaster_secret));
2300 EVP_PKEY_free(pub_key);
2301
2302 return (ret);
2303 }
2304
2305 int
2306 ssl3_send_client_key_exchange(SSL *s)
2307 {
2308 SESS_CERT *sess_cert;
2309 unsigned long alg_k;
2310 CBB cbb, kex;
2311
2312 memset(&cbb, 0, sizeof(cbb));
2313
2314 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) {
2315 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
2316
2317 if ((sess_cert = SSI(s)->sess_cert) == NULL) {
2318 ssl3_send_alert(s, SSL3_AL_FATAL,
2319 SSL_AD_UNEXPECTED_MESSAGE);
2320 SSLerror(s, ERR_R_INTERNAL_ERROR);
2321 goto err;
2322 }
2323
2324 if (!ssl3_handshake_msg_start(s, &cbb, &kex,
2325 SSL3_MT_CLIENT_KEY_EXCHANGE))
2326 goto err;
2327
2328 if (alg_k & SSL_kRSA) {
2329 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1)
2330 goto err;
2331 } else if (alg_k & SSL_kDHE) {
2332 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1)
2333 goto err;
2334 } else if (alg_k & SSL_kECDHE) {
2335 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1)
2336 goto err;
2337 } else if (alg_k & SSL_kGOST) {
2338 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1)
2339 goto err;
2340 } else {
2341 ssl3_send_alert(s, SSL3_AL_FATAL,
2342 SSL_AD_HANDSHAKE_FAILURE);
2343 SSLerror(s, ERR_R_INTERNAL_ERROR);
2344 goto err;
2345 }
2346
2347 if (!ssl3_handshake_msg_finish(s, &cbb))
2348 goto err;
2349
2350 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B;
2351 }
2352
2353 /* SSL3_ST_CW_KEY_EXCH_B */
2354 return (ssl3_handshake_write(s));
2355
2356 err:
2357 CBB_cleanup(&cbb);
2358
2359 return (-1);
2360 }
2361
2362 int
2363 ssl3_send_client_verify(SSL *s)
2364 {
2365 CBB cbb, cert_verify, cbb_signature;
2366 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
2367 unsigned char *signature = NULL;
2368 unsigned int signature_len;
2369 EVP_PKEY_CTX *pctx = NULL;
2370 EVP_PKEY *pkey;
2371 EVP_MD_CTX mctx;
2372 const EVP_MD *md;
2373 long hdatalen;
2374 void *hdata;
2375
2376 EVP_MD_CTX_init(&mctx);
2377
2378 memset(&cbb, 0, sizeof(cbb));
2379
2380 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) {
2381 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify,
2382 SSL3_MT_CERTIFICATE_VERIFY))
2383 goto err;
2384
2385 /*
2386 * Create context from key and test if sha1 is allowed as
2387 * digest.
2388 */
2389 pkey = s->cert->key->privatekey;
2390 pctx = EVP_PKEY_CTX_new(pkey, NULL);
2391 EVP_PKEY_sign_init(pctx);
2392
2393 /* XXX - is this needed? */
2394 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) <= 0)
2395 ERR_clear_error();
2396
2397 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL)
2398 goto err;
2399
2400 if (!SSL_USE_SIGALGS(s)) {
2401 if (S3I(s)->handshake_buffer) {
2402 if (!tls1_digest_cached_records(s))
2403 goto err;
2404 }
2405 if (!tls1_handshake_hash_value(s, data, sizeof(data),
2406 NULL))
2407 goto err;
2408 }
2409
2410 /*
2411 * For TLS v1.2 send signature algorithm and signature
2412 * using agreed digest and cached handshake records.
2413 */
2414 if (SSL_USE_SIGALGS(s)) {
2415 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer,
2416 &hdata);
2417 md = s->cert->key->digest;
2418 if (hdatalen <= 0 ||
2419 !tls12_get_hashandsig(&cert_verify, pkey, md)) {
2420 SSLerror(s, ERR_R_INTERNAL_ERROR);
2421 goto err;
2422 }
2423 if (!EVP_SignInit_ex(&mctx, md, NULL) ||
2424 !EVP_SignUpdate(&mctx, hdata, hdatalen) ||
2425 !EVP_SignFinal(&mctx, signature, &signature_len,
2426 pkey)) {
2427 SSLerror(s, ERR_R_EVP_LIB);
2428 goto err;
2429 }
2430 if (!tls1_digest_cached_records(s))
2431 goto err;
2432 } else if (pkey->type == EVP_PKEY_RSA) {
2433 if (RSA_sign(NID_md5_sha1, data,
2434 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, signature,
2435 &signature_len, pkey->pkey.rsa) <= 0 ) {
2436 SSLerror(s, ERR_R_RSA_LIB);
2437 goto err;
2438 }
2439 } else if (pkey->type == EVP_PKEY_EC) {
2440 if (!ECDSA_sign(pkey->save_type,
2441 &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH,
2442 signature, &signature_len, pkey->pkey.ec)) {
2443 SSLerror(s, ERR_R_ECDSA_LIB);
2444 goto err;
2445 }
2446 #ifndef OPENSSL_NO_GOST
2447 } else if (pkey->type == NID_id_GostR3410_94 ||
2448 pkey->type == NID_id_GostR3410_2001) {
2449 unsigned char signbuf[128];
2450 unsigned int u;
2451 size_t sigsize;
2452 int nid;
2453
2454 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata);
2455 if (hdatalen <= 0) {
2456 SSLerror(s, ERR_R_INTERNAL_ERROR);
2457 goto err;
2458 }
2459 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) ||
2460 !(md = EVP_get_digestbynid(nid))) {
2461 SSLerror(s, ERR_R_EVP_LIB);
2462 goto err;
2463 }
2464 if (!EVP_DigestInit_ex(&mctx, md, NULL) ||
2465 !EVP_DigestUpdate(&mctx, hdata, hdatalen) ||
2466 !EVP_DigestFinal(&mctx, signbuf, &u) ||
2467 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) ||
2468 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
2469 EVP_PKEY_CTRL_GOST_SIG_FORMAT,
2470 GOST_SIG_FORMAT_RS_LE, NULL) <= 0) ||
2471 (EVP_PKEY_sign(pctx, signature, &sigsize,
2472 signbuf, u) <= 0)) {
2473 SSLerror(s, ERR_R_EVP_LIB);
2474 goto err;
2475 }
2476 if (sigsize > UINT_MAX)
2477 goto err;
2478 signature_len = sigsize;
2479 if (!tls1_digest_cached_records(s))
2480 goto err;
2481 #endif
2482 } else {
2483 SSLerror(s, ERR_R_INTERNAL_ERROR);
2484 goto err;
2485 }
2486
2487 if (!CBB_add_u16_length_prefixed(&cert_verify, &cbb_signature))
2488 goto err;
2489 if (!CBB_add_bytes(&cbb_signature, signature, signature_len))
2490 goto err;
2491
2492 if (!ssl3_handshake_msg_finish(s, &cbb))
2493 goto err;
2494
2495 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B;
2496 }
2497
2498 EVP_MD_CTX_cleanup(&mctx);
2499 EVP_PKEY_CTX_free(pctx);
2500 free(signature);
2501
2502 return (ssl3_handshake_write(s));
2503
2504 err:
2505 CBB_cleanup(&cbb);
2506 EVP_MD_CTX_cleanup(&mctx);
2507 EVP_PKEY_CTX_free(pctx);
2508 free(signature);
2509
2510 return (-1);
2511 }
2512
2513 int
2514 ssl3_send_client_certificate(SSL *s)
2515 {
2516 EVP_PKEY *pkey = NULL;
2517 X509 *x509 = NULL;
2518 CBB cbb, client_cert;
2519 int i;
2520
2521 memset(&cbb, 0, sizeof(cbb));
2522
2523 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) {
2524 if ((s->cert == NULL) || (s->cert->key->x509 == NULL) ||
2525 (s->cert->key->privatekey == NULL))
2526 S3I(s)->hs.state = SSL3_ST_CW_CERT_B;
2527 else
2528 S3I(s)->hs.state = SSL3_ST_CW_CERT_C;
2529 }
2530
2531 /* We need to get a client cert */
2532 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) {
2533 /*
2534 * If we get an error, we need to
2535 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2536 * We then get retied later
2537 */
2538 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2539 if (i < 0) {
2540 s->internal->rwstate = SSL_X509_LOOKUP;
2541 return (-1);
2542 }
2543 s->internal->rwstate = SSL_NOTHING;
2544 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
2545 S3I(s)->hs.state = SSL3_ST_CW_CERT_B;
2546 if (!SSL_use_certificate(s, x509) ||
2547 !SSL_use_PrivateKey(s, pkey))
2548 i = 0;
2549 } else if (i == 1) {
2550 i = 0;
2551 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2552 }
2553
2554 X509_free(x509);
2555 EVP_PKEY_free(pkey);
2556 if (i == 0)
2557 S3I(s)->tmp.cert_req = 2;
2558
2559 /* Ok, we have a cert */
2560 S3I(s)->hs.state = SSL3_ST_CW_CERT_C;
2561 }
2562
2563 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) {
2564 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert,
2565 SSL3_MT_CERTIFICATE))
2566 goto err;
2567 if (!ssl3_output_cert_chain(s, &client_cert,
2568 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key->x509))
2569 goto err;
2570 if (!ssl3_handshake_msg_finish(s, &cbb))
2571 goto err;
2572
2573 S3I(s)->hs.state = SSL3_ST_CW_CERT_D;
2574 }
2575
2576 /* SSL3_ST_CW_CERT_D */
2577 return (ssl3_handshake_write(s));
2578
2579 err:
2580 CBB_cleanup(&cbb);
2581
2582 return (0);
2583 }
2584
2585 #define has_bits(i,m) (((i)&(m)) == (m))
2586
2587 int
2588 ssl3_check_cert_and_algorithm(SSL *s)
2589 {
2590 int i, idx;
2591 long alg_k, alg_a;
2592 EVP_PKEY *pkey = NULL;
2593 SESS_CERT *sc;
2594 DH *dh;
2595
2596 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey;
2597 alg_a = S3I(s)->hs.new_cipher->algorithm_auth;
2598
2599 /* We don't have a certificate. */
2600 if (alg_a & SSL_aNULL)
2601 return (1);
2602
2603 sc = SSI(s)->sess_cert;
2604 if (sc == NULL) {
2605 SSLerror(s, ERR_R_INTERNAL_ERROR);
2606 goto err;
2607 }
2608 dh = SSI(s)->sess_cert->peer_dh_tmp;
2609
2610 /* This is the passed certificate. */
2611
2612 idx = sc->peer_cert_type;
2613 if (idx == SSL_PKEY_ECC) {
2614 if (ssl_check_srvr_ecc_cert_and_alg(
2615 sc->peer_pkeys[idx].x509, s) == 0) {
2616 /* check failed */
2617 SSLerror(s, SSL_R_BAD_ECC_CERT);
2618 goto f_err;
2619 } else {
2620 return (1);
2621 }
2622 }
2623 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
2624 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
2625 EVP_PKEY_free(pkey);
2626
2627 /* Check that we have a certificate if we require one. */
2628 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) {
2629 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT);
2630 goto f_err;
2631 }
2632 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) {
2633 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2634 goto f_err;
2635 }
2636 if ((alg_k & SSL_kDHE) &&
2637 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) {
2638 SSLerror(s, SSL_R_MISSING_DH_KEY);
2639 goto f_err;
2640 }
2641
2642 return (1);
2643 f_err:
2644 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2645 err:
2646 return (0);
2647 }
2648
2649 /*
2650 * Check to see if handshake is full or resumed. Usually this is just a
2651 * case of checking to see if a cache hit has occurred. In the case of
2652 * session tickets we have to check the next message to be sure.
2653 */
2654
2655 int
2656 ssl3_check_finished(SSL *s)
2657 {
2658 int ok;
2659 long n;
2660
2661 /* If we have no ticket it cannot be a resumed session. */
2662 if (!s->session->tlsext_tick)
2663 return (1);
2664 /* this function is called when we really expect a Certificate
2665 * message, so permit appropriate message length */
2666 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A,
2667 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok);
2668 if (!ok)
2669 return ((int)n);
2670 S3I(s)->tmp.reuse_message = 1;
2671 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) ||
2672 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2673 return (2);
2674
2675 return (1);
2676 }
2677
2678 int
2679 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2680 {
2681 int i = 0;
2682
2683 #ifndef OPENSSL_NO_ENGINE
2684 if (s->ctx->internal->client_cert_engine) {
2685 i = ENGINE_load_ssl_client_cert(
2686 s->ctx->internal->client_cert_engine, s,
2687 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL);
2688 if (i != 0)
2689 return (i);
2690 }
2691 #endif
2692 if (s->ctx->internal->client_cert_cb)
2693 i = s->ctx->internal->client_cert_cb(s, px509, ppkey);
2694 return (i);
2695 }