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-rw-r--r--src/lib/libssl/d1_srvr.c1329
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1/* $OpenBSD: d1_srvr.c,v 1.55 2015/06/18 22:51:05 doug Exp $ */
2/*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6/* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
61 *
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
65 *
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
72 *
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97 *
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108 * SUCH DAMAGE.
109 *
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
114 */
115
116#include <stdio.h>
117
118#include "ssl_locl.h"
119
120#include <openssl/bn.h>
121#include <openssl/buffer.h>
122#include <openssl/dh.h>
123#include <openssl/evp.h>
124#include <openssl/md5.h>
125#include <openssl/objects.h>
126#include <openssl/x509.h>
127
128static const SSL_METHOD *dtls1_get_server_method(int ver);
129static int dtls1_send_hello_verify_request(SSL *s);
130
131const SSL_METHOD DTLSv1_server_method_data = {
132 .version = DTLS1_VERSION,
133 .ssl_new = dtls1_new,
134 .ssl_clear = dtls1_clear,
135 .ssl_free = dtls1_free,
136 .ssl_accept = dtls1_accept,
137 .ssl_connect = ssl_undefined_function,
138 .ssl_read = ssl3_read,
139 .ssl_peek = ssl3_peek,
140 .ssl_write = ssl3_write,
141 .ssl_shutdown = dtls1_shutdown,
142 .ssl_renegotiate = ssl3_renegotiate,
143 .ssl_renegotiate_check = ssl3_renegotiate_check,
144 .ssl_get_message = dtls1_get_message,
145 .ssl_read_bytes = dtls1_read_bytes,
146 .ssl_write_bytes = dtls1_write_app_data_bytes,
147 .ssl_dispatch_alert = dtls1_dispatch_alert,
148 .ssl_ctrl = dtls1_ctrl,
149 .ssl_ctx_ctrl = ssl3_ctx_ctrl,
150 .get_cipher_by_char = ssl3_get_cipher_by_char,
151 .put_cipher_by_char = ssl3_put_cipher_by_char,
152 .ssl_pending = ssl3_pending,
153 .num_ciphers = ssl3_num_ciphers,
154 .get_cipher = dtls1_get_cipher,
155 .get_ssl_method = dtls1_get_server_method,
156 .get_timeout = dtls1_default_timeout,
157 .ssl3_enc = &DTLSv1_enc_data,
158 .ssl_version = ssl_undefined_void_function,
159 .ssl_callback_ctrl = ssl3_callback_ctrl,
160 .ssl_ctx_callback_ctrl = ssl3_ctx_callback_ctrl,
161};
162
163const SSL_METHOD *
164DTLSv1_server_method(void)
165{
166 return &DTLSv1_server_method_data;
167}
168
169static const SSL_METHOD *
170dtls1_get_server_method(int ver)
171{
172 if (ver == DTLS1_VERSION)
173 return (DTLSv1_server_method());
174 return (NULL);
175}
176
177int
178dtls1_accept(SSL *s)
179{
180 void (*cb)(const SSL *ssl, int type, int val) = NULL;
181 unsigned long alg_k;
182 int ret = -1;
183 int new_state, state, skip = 0;
184 int listen;
185
186 ERR_clear_error();
187 errno = 0;
188
189 if (s->info_callback != NULL)
190 cb = s->info_callback;
191 else if (s->ctx->info_callback != NULL)
192 cb = s->ctx->info_callback;
193
194 listen = s->d1->listen;
195
196 /* init things to blank */
197 s->in_handshake++;
198 if (!SSL_in_init(s) || SSL_in_before(s))
199 SSL_clear(s);
200
201 s->d1->listen = listen;
202
203 if (s->cert == NULL) {
204 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
205 return (-1);
206 }
207
208 for (;;) {
209 state = s->state;
210
211 switch (s->state) {
212 case SSL_ST_RENEGOTIATE:
213 s->renegotiate = 1;
214 /* s->state=SSL_ST_ACCEPT; */
215
216 case SSL_ST_BEFORE:
217 case SSL_ST_ACCEPT:
218 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
219 case SSL_ST_OK|SSL_ST_ACCEPT:
220
221 s->server = 1;
222 if (cb != NULL)
223 cb(s, SSL_CB_HANDSHAKE_START, 1);
224
225 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
226 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
227 return -1;
228 }
229 s->type = SSL_ST_ACCEPT;
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
240 s->init_num = 0;
241
242 if (s->state != SSL_ST_RENEGOTIATE) {
243 /* Ok, we now need to push on a buffering BIO so that
244 * the output is sent in a way that TCP likes :-)
245 * ...but not with SCTP :-)
246 */
247 if (!ssl_init_wbio_buffer(s, 1)) {
248 ret = -1;
249 goto end;
250 }
251
252 if (!ssl3_init_finished_mac(s)) {
253 ret = -1;
254 goto end;
255 }
256
257 s->state = SSL3_ST_SR_CLNT_HELLO_A;
258 s->ctx->stats.sess_accept++;
259 } else {
260 /* s->state == SSL_ST_RENEGOTIATE,
261 * we will just send a HelloRequest */
262 s->ctx->stats.sess_accept_renegotiate++;
263 s->state = SSL3_ST_SW_HELLO_REQ_A;
264 }
265
266 break;
267
268 case SSL3_ST_SW_HELLO_REQ_A:
269 case SSL3_ST_SW_HELLO_REQ_B:
270
271 s->shutdown = 0;
272 dtls1_clear_record_buffer(s);
273 dtls1_start_timer(s);
274 ret = dtls1_send_hello_request(s);
275 if (ret <= 0)
276 goto end;
277 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
278 s->state = SSL3_ST_SW_FLUSH;
279 s->init_num = 0;
280
281 if (!ssl3_init_finished_mac(s)) {
282 ret = -1;
283 goto end;
284 }
285 break;
286
287 case SSL3_ST_SW_HELLO_REQ_C:
288 s->state = SSL_ST_OK;
289 break;
290
291 case SSL3_ST_SR_CLNT_HELLO_A:
292 case SSL3_ST_SR_CLNT_HELLO_B:
293 case SSL3_ST_SR_CLNT_HELLO_C:
294
295 s->shutdown = 0;
296 ret = ssl3_get_client_hello(s);
297 if (ret <= 0)
298 goto end;
299 dtls1_stop_timer(s);
300
301 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
302 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
303 else
304 s->state = SSL3_ST_SW_SRVR_HELLO_A;
305
306 s->init_num = 0;
307
308 /* Reflect ClientHello sequence to remain stateless while listening */
309 if (listen) {
310 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
311 }
312
313 /* If we're just listening, stop here */
314 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
315 ret = 2;
316 s->d1->listen = 0;
317 /* Set expected sequence numbers
318 * to continue the handshake.
319 */
320 s->d1->handshake_read_seq = 2;
321 s->d1->handshake_write_seq = 1;
322 s->d1->next_handshake_write_seq = 1;
323 goto end;
324 }
325
326 break;
327
328 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
329 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
330
331 ret = dtls1_send_hello_verify_request(s);
332 if (ret <= 0)
333 goto end;
334 s->state = SSL3_ST_SW_FLUSH;
335 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
336
337 /* HelloVerifyRequest resets Finished MAC */
338 if (s->version != DTLS1_BAD_VER) {
339 if (!ssl3_init_finished_mac(s)) {
340 ret = -1;
341 goto end;
342 }
343 }
344 break;
345
346
347 case SSL3_ST_SW_SRVR_HELLO_A:
348 case SSL3_ST_SW_SRVR_HELLO_B:
349 s->renegotiate = 2;
350 dtls1_start_timer(s);
351 ret = dtls1_send_server_hello(s);
352 if (ret <= 0)
353 goto end;
354
355 if (s->hit) {
356 if (s->tlsext_ticket_expected)
357 s->state = SSL3_ST_SW_SESSION_TICKET_A;
358 else
359 s->state = SSL3_ST_SW_CHANGE_A;
360 } else
361 s->state = SSL3_ST_SW_CERT_A;
362 s->init_num = 0;
363 break;
364
365 case SSL3_ST_SW_CERT_A:
366 case SSL3_ST_SW_CERT_B:
367 /* Check if it is anon DH. */
368 if (!(s->s3->tmp.new_cipher->algorithm_auth &
369 SSL_aNULL)) {
370 dtls1_start_timer(s);
371 ret = dtls1_send_server_certificate(s);
372 if (ret <= 0)
373 goto end;
374 if (s->tlsext_status_expected)
375 s->state = SSL3_ST_SW_CERT_STATUS_A;
376 else
377 s->state = SSL3_ST_SW_KEY_EXCH_A;
378 } else {
379 skip = 1;
380 s->state = SSL3_ST_SW_KEY_EXCH_A;
381 }
382 s->init_num = 0;
383 break;
384
385 case SSL3_ST_SW_KEY_EXCH_A:
386 case SSL3_ST_SW_KEY_EXCH_B:
387 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
388
389 /* Only send if using a DH key exchange. */
390 if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
391 dtls1_start_timer(s);
392 ret = dtls1_send_server_key_exchange(s);
393 if (ret <= 0)
394 goto end;
395 } else
396 skip = 1;
397
398 s->state = SSL3_ST_SW_CERT_REQ_A;
399 s->init_num = 0;
400 break;
401
402 case SSL3_ST_SW_CERT_REQ_A:
403 case SSL3_ST_SW_CERT_REQ_B:
404 /*
405 * Determine whether or not we need to request a
406 * certificate.
407 *
408 * Do not request a certificate if:
409 *
410 * - We did not ask for it (SSL_VERIFY_PEER is unset).
411 *
412 * - SSL_VERIFY_CLIENT_ONCE is set and we are
413 * renegotiating.
414 *
415 * - We are using an anonymous ciphersuites
416 * (see section "Certificate request" in SSL 3 drafts
417 * and in RFC 2246) ... except when the application
418 * insists on verification (against the specs, but
419 * s3_clnt.c accepts this for SSL 3).
420 */
421 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
422 ((s->session->peer != NULL) &&
423 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
424 ((s->s3->tmp.new_cipher->algorithm_auth &
425 SSL_aNULL) && !(s->verify_mode &
426 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
427 /* no cert request */
428 skip = 1;
429 s->s3->tmp.cert_request = 0;
430 s->state = SSL3_ST_SW_SRVR_DONE_A;
431 } else {
432 s->s3->tmp.cert_request = 1;
433 dtls1_start_timer(s);
434 ret = dtls1_send_certificate_request(s);
435 if (ret <= 0)
436 goto end;
437 s->state = SSL3_ST_SW_SRVR_DONE_A;
438 s->init_num = 0;
439 }
440 break;
441
442 case SSL3_ST_SW_SRVR_DONE_A:
443 case SSL3_ST_SW_SRVR_DONE_B:
444 dtls1_start_timer(s);
445 ret = dtls1_send_server_done(s);
446 if (ret <= 0)
447 goto end;
448 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
449 s->state = SSL3_ST_SW_FLUSH;
450 s->init_num = 0;
451 break;
452
453 case SSL3_ST_SW_FLUSH:
454 s->rwstate = SSL_WRITING;
455 if (BIO_flush(s->wbio) <= 0) {
456 /* If the write error was fatal, stop trying */
457 if (!BIO_should_retry(s->wbio)) {
458 s->rwstate = SSL_NOTHING;
459 s->state = s->s3->tmp.next_state;
460 }
461
462 ret = -1;
463 goto end;
464 }
465 s->rwstate = SSL_NOTHING;
466 s->state = s->s3->tmp.next_state;
467 break;
468
469 case SSL3_ST_SR_CERT_A:
470 case SSL3_ST_SR_CERT_B:
471 if (s->s3->tmp.cert_request) {
472 ret = ssl3_get_client_certificate(s);
473 if (ret <= 0)
474 goto end;
475 }
476 s->init_num = 0;
477 s->state = SSL3_ST_SR_KEY_EXCH_A;
478 break;
479
480 case SSL3_ST_SR_KEY_EXCH_A:
481 case SSL3_ST_SR_KEY_EXCH_B:
482 ret = ssl3_get_client_key_exchange(s);
483 if (ret <= 0)
484 goto end;
485
486 s->state = SSL3_ST_SR_CERT_VRFY_A;
487 s->init_num = 0;
488
489 if (ret == 2) {
490 /* For the ECDH ciphersuites when
491 * the client sends its ECDH pub key in
492 * a certificate, the CertificateVerify
493 * message is not sent.
494 */
495 s->state = SSL3_ST_SR_FINISHED_A;
496 s->init_num = 0;
497 } else {
498 s->state = SSL3_ST_SR_CERT_VRFY_A;
499 s->init_num = 0;
500
501 /* We need to get hashes here so if there is
502 * a client cert, it can be verified */
503 s->method->ssl3_enc->cert_verify_mac(s,
504 NID_md5, &(s->s3->tmp.cert_verify_md[0]));
505 s->method->ssl3_enc->cert_verify_mac(s,
506 NID_sha1,
507 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
508 }
509 break;
510
511 case SSL3_ST_SR_CERT_VRFY_A:
512 case SSL3_ST_SR_CERT_VRFY_B:
513
514 s->d1->change_cipher_spec_ok = 1;
515 /* we should decide if we expected this one */
516 ret = ssl3_get_cert_verify(s);
517 if (ret <= 0)
518 goto end;
519 s->state = SSL3_ST_SR_FINISHED_A;
520 s->init_num = 0;
521 break;
522
523 case SSL3_ST_SR_FINISHED_A:
524 case SSL3_ST_SR_FINISHED_B:
525 s->d1->change_cipher_spec_ok = 1;
526 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
527 SSL3_ST_SR_FINISHED_B);
528 if (ret <= 0)
529 goto end;
530 dtls1_stop_timer(s);
531 if (s->hit)
532 s->state = SSL_ST_OK;
533 else if (s->tlsext_ticket_expected)
534 s->state = SSL3_ST_SW_SESSION_TICKET_A;
535 else
536 s->state = SSL3_ST_SW_CHANGE_A;
537 s->init_num = 0;
538 break;
539
540 case SSL3_ST_SW_SESSION_TICKET_A:
541 case SSL3_ST_SW_SESSION_TICKET_B:
542 ret = dtls1_send_newsession_ticket(s);
543 if (ret <= 0)
544 goto end;
545 s->state = SSL3_ST_SW_CHANGE_A;
546 s->init_num = 0;
547 break;
548
549 case SSL3_ST_SW_CERT_STATUS_A:
550 case SSL3_ST_SW_CERT_STATUS_B:
551 ret = ssl3_send_cert_status(s);
552 if (ret <= 0)
553 goto end;
554 s->state = SSL3_ST_SW_KEY_EXCH_A;
555 s->init_num = 0;
556 break;
557
558
559 case SSL3_ST_SW_CHANGE_A:
560 case SSL3_ST_SW_CHANGE_B:
561
562 s->session->cipher = s->s3->tmp.new_cipher;
563 if (!s->method->ssl3_enc->setup_key_block(s)) {
564 ret = -1;
565 goto end;
566 }
567
568 ret = dtls1_send_change_cipher_spec(s,
569 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B);
570
571 if (ret <= 0)
572 goto end;
573
574
575 s->state = SSL3_ST_SW_FINISHED_A;
576 s->init_num = 0;
577
578 if (!s->method->ssl3_enc->change_cipher_state(s,
579 SSL3_CHANGE_CIPHER_SERVER_WRITE)) {
580 ret = -1;
581 goto end;
582 }
583
584 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
585 break;
586
587 case SSL3_ST_SW_FINISHED_A:
588 case SSL3_ST_SW_FINISHED_B:
589 ret = dtls1_send_finished(s,
590 SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B,
591 s->method->ssl3_enc->server_finished_label,
592 s->method->ssl3_enc->server_finished_label_len);
593 if (ret <= 0)
594 goto end;
595 s->state = SSL3_ST_SW_FLUSH;
596 if (s->hit) {
597 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
598
599 } else {
600 s->s3->tmp.next_state = SSL_ST_OK;
601 }
602 s->init_num = 0;
603 break;
604
605 case SSL_ST_OK:
606 /* clean a few things up */
607 ssl3_cleanup_key_block(s);
608
609 /* remove buffering on output */
610 ssl_free_wbio_buffer(s);
611
612 s->init_num = 0;
613
614 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
615 {
616 s->renegotiate = 0;
617 s->new_session = 0;
618
619 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
620
621 s->ctx->stats.sess_accept_good++;
622 /* s->server=1; */
623 s->handshake_func = dtls1_accept;
624
625 if (cb != NULL)
626 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
627 }
628
629 ret = 1;
630
631 /* done handshaking, next message is client hello */
632 s->d1->handshake_read_seq = 0;
633 /* next message is server hello */
634 s->d1->handshake_write_seq = 0;
635 s->d1->next_handshake_write_seq = 0;
636 goto end;
637 /* break; */
638
639 default:
640 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
641 ret = -1;
642 goto end;
643 /* break; */
644 }
645
646 if (!s->s3->tmp.reuse_message && !skip) {
647 if (s->debug) {
648 if ((ret = BIO_flush(s->wbio)) <= 0)
649 goto end;
650 }
651
652 if ((cb != NULL) && (s->state != state)) {
653 new_state = s->state;
654 s->state = state;
655 cb(s, SSL_CB_ACCEPT_LOOP, 1);
656 s->state = new_state;
657 }
658 }
659 skip = 0;
660 }
661end:
662 /* BIO_flush(s->wbio); */
663
664 s->in_handshake--;
665
666 if (cb != NULL)
667 cb(s, SSL_CB_ACCEPT_EXIT, ret);
668 return (ret);
669}
670
671int
672dtls1_send_hello_request(SSL *s)
673{
674 if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
675 ssl3_handshake_msg_start(s, SSL3_MT_HELLO_REQUEST);
676 ssl3_handshake_msg_finish(s, 0);
677
678 s->state = SSL3_ST_SW_HELLO_REQ_B;
679 }
680
681 /* SSL3_ST_SW_HELLO_REQ_B */
682 return (ssl3_handshake_write(s));
683}
684
685int
686dtls1_send_hello_verify_request(SSL *s)
687{
688 unsigned char *d, *p;
689
690 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
691 d = p = ssl3_handshake_msg_start(s,
692 DTLS1_MT_HELLO_VERIFY_REQUEST);
693
694 *(p++) = s->version >> 8;
695 *(p++) = s->version & 0xFF;
696
697 if (s->ctx->app_gen_cookie_cb == NULL ||
698 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
699 &(s->d1->cookie_len)) == 0) {
700 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
701 ERR_R_INTERNAL_ERROR);
702 return 0;
703 }
704
705 *(p++) = (unsigned char) s->d1->cookie_len;
706 memcpy(p, s->d1->cookie, s->d1->cookie_len);
707 p += s->d1->cookie_len;
708
709 ssl3_handshake_msg_finish(s, p - d);
710
711 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
712 }
713
714 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
715 return (ssl3_handshake_write(s));
716}
717
718int
719dtls1_send_server_hello(SSL *s)
720{
721 unsigned char *bufend;
722 unsigned char *p, *d;
723 unsigned int sl;
724
725 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
726 d = p = ssl3_handshake_msg_start(s, SSL3_MT_SERVER_HELLO);
727
728 *(p++) = s->version >> 8;
729 *(p++) = s->version & 0xff;
730
731 /* Random stuff */
732 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE);
733 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
734 p += SSL3_RANDOM_SIZE;
735
736 /* now in theory we have 3 options to sending back the
737 * session id. If it is a re-use, we send back the
738 * old session-id, if it is a new session, we send
739 * back the new session-id or we send back a 0 length
740 * session-id if we want it to be single use.
741 * Currently I will not implement the '0' length session-id
742 * 12-Jan-98 - I'll now support the '0' length stuff.
743 */
744 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
745 s->session->session_id_length = 0;
746
747 sl = s->session->session_id_length;
748 if (sl > sizeof s->session->session_id) {
749 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,
750 ERR_R_INTERNAL_ERROR);
751 return -1;
752 }
753 *(p++) = sl;
754 memcpy(p, s->session->session_id, sl);
755 p += sl;
756
757 /* put the cipher */
758 if (s->s3->tmp.new_cipher == NULL)
759 return -1;
760 s2n(ssl3_cipher_get_value(s->s3->tmp.new_cipher), p);
761
762 /* put the compression method */
763 *(p++) = 0;
764
765 bufend = (unsigned char *)s->init_buf->data +
766 SSL3_RT_MAX_PLAIN_LENGTH;
767 if ((p = ssl_add_serverhello_tlsext(s, p, bufend)) == NULL) {
768 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,
769 ERR_R_INTERNAL_ERROR);
770 return -1;
771 }
772
773 ssl3_handshake_msg_finish(s, p - d);
774
775 s->state = SSL3_ST_SW_SRVR_HELLO_B;
776 }
777
778 /* SSL3_ST_SW_SRVR_HELLO_B */
779 return (ssl3_handshake_write(s));
780}
781
782int
783dtls1_send_server_done(SSL *s)
784{
785 if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
786 ssl3_handshake_msg_start(s, SSL3_MT_SERVER_DONE);
787 ssl3_handshake_msg_finish(s, 0);
788
789 s->state = SSL3_ST_SW_SRVR_DONE_B;
790 }
791
792 /* SSL3_ST_SW_SRVR_DONE_B */
793 return (ssl3_handshake_write(s));
794}
795
796int
797dtls1_send_server_key_exchange(SSL *s)
798{
799 unsigned char *q;
800 int j, num;
801 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
802 unsigned int u;
803 DH *dh = NULL, *dhp;
804 EC_KEY *ecdh = NULL, *ecdhp;
805 unsigned char *encodedPoint = NULL;
806 int encodedlen = 0;
807 int curve_id = 0;
808 BN_CTX *bn_ctx = NULL;
809
810 EVP_PKEY *pkey;
811 unsigned char *p, *d;
812 int al, i;
813 unsigned long type;
814 int n;
815 CERT *cert;
816 BIGNUM *r[4];
817 int nr[4], kn;
818 BUF_MEM *buf;
819 EVP_MD_CTX md_ctx;
820
821 EVP_MD_CTX_init(&md_ctx);
822 if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
823 type = s->s3->tmp.new_cipher->algorithm_mkey;
824 cert = s->cert;
825
826 buf = s->init_buf;
827
828 r[0] = r[1] = r[2] = r[3] = NULL;
829 n = 0;
830
831 if (type & SSL_kDHE) {
832 dhp = cert->dh_tmp;
833 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
834 dhp = s->cert->dh_tmp_cb(s, 0,
835 SSL_C_PKEYLENGTH(s->s3->tmp.new_cipher));
836 if (dhp == NULL) {
837 al = SSL_AD_HANDSHAKE_FAILURE;
838 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, SSL_R_MISSING_TMP_DH_KEY);
839 goto f_err;
840 }
841
842 if (s->s3->tmp.dh != NULL) {
843 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
844 goto err;
845 }
846
847 if ((dh = DHparams_dup(dhp)) == NULL) {
848 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
849 goto err;
850 }
851
852 s->s3->tmp.dh = dh;
853 if ((dhp->pub_key == NULL || dhp->priv_key == NULL ||
854 (s->options & SSL_OP_SINGLE_DH_USE))) {
855 if (!DH_generate_key(dh)) {
856 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
857 ERR_R_DH_LIB);
858 goto err;
859 }
860 } else {
861 dh->pub_key = BN_dup(dhp->pub_key);
862 dh->priv_key = BN_dup(dhp->priv_key);
863 if ((dh->pub_key == NULL) ||
864 (dh->priv_key == NULL)) {
865 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
866 goto err;
867 }
868 }
869 r[0] = dh->p;
870 r[1] = dh->g;
871 r[2] = dh->pub_key;
872 } else if (type & SSL_kECDHE) {
873 const EC_GROUP *group;
874
875 ecdhp = cert->ecdh_tmp;
876 if (ecdhp == NULL && s->cert->ecdh_tmp_cb != NULL)
877 ecdhp = s->cert->ecdh_tmp_cb(s, 0,
878 SSL_C_PKEYLENGTH(s->s3->tmp.new_cipher));
879 if (ecdhp == NULL) {
880 al = SSL_AD_HANDSHAKE_FAILURE;
881 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, SSL_R_MISSING_TMP_ECDH_KEY);
882 goto f_err;
883 }
884
885 if (s->s3->tmp.ecdh != NULL) {
886 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
887 goto err;
888 }
889
890 /* Duplicate the ECDH structure. */
891 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
892 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
893 goto err;
894 }
895 s->s3->tmp.ecdh = ecdh;
896
897 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
898 (EC_KEY_get0_private_key(ecdh) == NULL) ||
899 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
900 if (!EC_KEY_generate_key(ecdh)) {
901 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
902 goto err;
903 }
904 }
905
906 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
907 (EC_KEY_get0_public_key(ecdh) == NULL) ||
908 (EC_KEY_get0_private_key(ecdh) == NULL)) {
909 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
910 goto err;
911 }
912
913 /* XXX: For now, we only support ephemeral ECDH
914 * keys over named (not generic) curves. For
915 * supported named curves, curve_id is non-zero.
916 */
917 if ((curve_id = tls1_ec_nid2curve_id(
918 EC_GROUP_get_curve_name(group))) == 0) {
919 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
920 goto err;
921 }
922
923 /* Encode the public key.
924 * First check the size of encoding and
925 * allocate memory accordingly.
926 */
927 encodedlen = EC_POINT_point2oct(group,
928 EC_KEY_get0_public_key(ecdh),
929 POINT_CONVERSION_UNCOMPRESSED,
930 NULL, 0, NULL);
931
932 encodedPoint = malloc(encodedlen);
933
934 bn_ctx = BN_CTX_new();
935 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
936 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
937 goto err;
938 }
939
940
941 encodedlen = EC_POINT_point2oct(group,
942 EC_KEY_get0_public_key(ecdh),
943 POINT_CONVERSION_UNCOMPRESSED,
944 encodedPoint, encodedlen, bn_ctx);
945
946 if (encodedlen == 0) {
947 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
948 goto err;
949 }
950
951 BN_CTX_free(bn_ctx);
952 bn_ctx = NULL;
953
954 /* XXX: For now, we only support named (not
955 * generic) curves in ECDH ephemeral key exchanges.
956 * In this situation, we need four additional bytes
957 * to encode the entire ServerECDHParams
958 * structure.
959 */
960 n = 4 + encodedlen;
961
962 /* We'll generate the serverKeyExchange message
963 * explicitly so we can set these to NULLs
964 */
965 r[0] = NULL;
966 r[1] = NULL;
967 r[2] = NULL;
968 r[3] = NULL;
969 } else {
970 al = SSL_AD_HANDSHAKE_FAILURE;
971 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
972 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
973 goto f_err;
974 }
975 for (i = 0; r[i] != NULL; i++) {
976 nr[i] = BN_num_bytes(r[i]);
977 n += 2 + nr[i];
978 }
979
980 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)) {
981 if ((pkey = ssl_get_sign_pkey(s,
982 s->s3->tmp.new_cipher, NULL)) == NULL) {
983 al = SSL_AD_DECODE_ERROR;
984 goto f_err;
985 }
986 kn = EVP_PKEY_size(pkey);
987 } else {
988 pkey = NULL;
989 kn = 0;
990 }
991
992 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) {
993 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
994 goto err;
995 }
996 d = (unsigned char *)s->init_buf->data;
997 p = &(d[DTLS1_HM_HEADER_LENGTH]);
998
999 for (i = 0; r[i] != NULL; i++) {
1000 s2n(nr[i], p);
1001 BN_bn2bin(r[i], p);
1002 p += nr[i];
1003 }
1004
1005 if (type & SSL_kECDHE) {
1006 /* XXX: For now, we only support named (not generic) curves.
1007 * In this situation, the serverKeyExchange message has:
1008 * [1 byte CurveType], [2 byte CurveName]
1009 * [1 byte length of encoded point], followed by
1010 * the actual encoded point itself
1011 */
1012 *p = NAMED_CURVE_TYPE;
1013 p += 1;
1014 *p = 0;
1015 p += 1;
1016 *p = curve_id;
1017 p += 1;
1018 *p = encodedlen;
1019 p += 1;
1020 memcpy((unsigned char*)p,
1021 (unsigned char *)encodedPoint, encodedlen);
1022 free(encodedPoint);
1023 encodedPoint = NULL;
1024 p += encodedlen;
1025 }
1026
1027
1028 /* not anonymous */
1029 if (pkey != NULL) {
1030 /* n is the length of the params, they start at
1031 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1032 * at the end. */
1033 if (pkey->type == EVP_PKEY_RSA) {
1034 q = md_buf;
1035 j = 0;
1036 for (num = 2; num > 0; num--) {
1037 if (!EVP_DigestInit_ex(&md_ctx, (num == 2)
1038 ? s->ctx->md5 : s->ctx->sha1, NULL))
1039 goto err;
1040 EVP_DigestUpdate(&md_ctx,
1041 &(s->s3->client_random[0]),
1042 SSL3_RANDOM_SIZE);
1043 EVP_DigestUpdate(&md_ctx,
1044 &(s->s3->server_random[0]),
1045 SSL3_RANDOM_SIZE);
1046 EVP_DigestUpdate(&md_ctx,
1047 &(d[DTLS1_HM_HEADER_LENGTH]), n);
1048 EVP_DigestFinal_ex(&md_ctx, q,
1049 (unsigned int *)&i);
1050 q += i;
1051 j += i;
1052 }
1053 if (RSA_sign(NID_md5_sha1, md_buf, j, &(p[2]),
1054 &u, pkey->pkey.rsa) <= 0) {
1055 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
1056 goto err;
1057 }
1058 s2n(u, p);
1059 n += u + 2;
1060 } else
1061 if (pkey->type == EVP_PKEY_DSA) {
1062 /* lets do DSS */
1063 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL);
1064 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE);
1065 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE);
1066 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1067 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1068 (unsigned int *)&i, pkey)) {
1069 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA);
1070 goto err;
1071 }
1072 s2n(i, p);
1073 n += i + 2;
1074 } else
1075 if (pkey->type == EVP_PKEY_EC) {
1076 /* let's do ECDSA */
1077 EVP_SignInit_ex(&md_ctx, EVP_ecdsa(), NULL);
1078 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE);
1079 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE);
1080 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1081 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1082 (unsigned int *)&i, pkey)) {
1083 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_ECDSA);
1084 goto err;
1085 }
1086 s2n(i, p);
1087 n += i + 2;
1088 } else
1089 {
1090 /* Is this error check actually needed? */
1091 al = SSL_AD_HANDSHAKE_FAILURE;
1092 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, SSL_R_UNKNOWN_PKEY_TYPE);
1093 goto f_err;
1094 }
1095 }
1096
1097 d = dtls1_set_message_header(s, d,
1098 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1099
1100 /* we should now have things packed up, so lets send
1101 * it off */
1102 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1103 s->init_off = 0;
1104
1105 /* buffer the message to handle re-xmits */
1106 dtls1_buffer_message(s, 0);
1107 }
1108
1109 s->state = SSL3_ST_SW_KEY_EXCH_B;
1110 EVP_MD_CTX_cleanup(&md_ctx);
1111 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1112f_err:
1113 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1114err:
1115 free(encodedPoint);
1116 BN_CTX_free(bn_ctx);
1117 EVP_MD_CTX_cleanup(&md_ctx);
1118 return (-1);
1119}
1120
1121int
1122dtls1_send_certificate_request(SSL *s)
1123{
1124 unsigned char *p, *d;
1125 int i, j, nl, off, n;
1126 STACK_OF(X509_NAME) *sk = NULL;
1127 X509_NAME *name;
1128 BUF_MEM *buf;
1129 unsigned int msg_len;
1130
1131 if (s->state == SSL3_ST_SW_CERT_REQ_A) {
1132 buf = s->init_buf;
1133
1134 d = p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1135
1136 /* get the list of acceptable cert types */
1137 p++;
1138 n = ssl3_get_req_cert_type(s, p);
1139 d[0] = n;
1140 p += n;
1141 n++;
1142
1143 off = n;
1144 p += 2;
1145 n += 2;
1146
1147 sk = SSL_get_client_CA_list(s);
1148 nl = 0;
1149 if (sk != NULL) {
1150 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1151 name = sk_X509_NAME_value(sk, i);
1152 j = i2d_X509_NAME(name, NULL);
1153 if (!BUF_MEM_grow_clean(buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) {
1154 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST, ERR_R_BUF_LIB);
1155 goto err;
1156 }
1157 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]);
1158 s2n(j, p);
1159 i2d_X509_NAME(name, &p);
1160 n += 2 + j;
1161 nl += 2 + j;
1162 }
1163 }
1164 /* else no CA names */
1165 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]);
1166 s2n(nl, p);
1167
1168 d = (unsigned char *)buf->data;
1169 *(d++) = SSL3_MT_CERTIFICATE_REQUEST;
1170 l2n3(n, d);
1171 s2n(s->d1->handshake_write_seq, d);
1172 s->d1->handshake_write_seq++;
1173
1174 /* we should now have things packed up, so lets send
1175 * it off */
1176
1177 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1178 s->init_off = 0;
1179
1180 /* XDTLS: set message header ? */
1181 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1182 dtls1_set_message_header(s, (void *)s->init_buf->data,
1183 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1184
1185 /* buffer the message to handle re-xmits */
1186 dtls1_buffer_message(s, 0);
1187
1188 s->state = SSL3_ST_SW_CERT_REQ_B;
1189 }
1190
1191 /* SSL3_ST_SW_CERT_REQ_B */
1192 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1193err:
1194 return (-1);
1195}
1196
1197int
1198dtls1_send_server_certificate(SSL *s)
1199{
1200 unsigned long l;
1201 X509 *x;
1202
1203 if (s->state == SSL3_ST_SW_CERT_A) {
1204 x = ssl_get_server_send_cert(s);
1205 if (x == NULL) {
1206 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,
1207 ERR_R_INTERNAL_ERROR);
1208 return (0);
1209 }
1210
1211 l = dtls1_output_cert_chain(s, x);
1212 s->state = SSL3_ST_SW_CERT_B;
1213 s->init_num = (int)l;
1214 s->init_off = 0;
1215
1216 /* buffer the message to handle re-xmits */
1217 dtls1_buffer_message(s, 0);
1218 }
1219
1220 /* SSL3_ST_SW_CERT_B */
1221 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1222}
1223
1224int
1225dtls1_send_newsession_ticket(SSL *s)
1226{
1227 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
1228 unsigned char *p, *senc, *macstart;
1229 int len, slen;
1230 unsigned int hlen, msg_len;
1231 EVP_CIPHER_CTX ctx;
1232 HMAC_CTX hctx;
1233 SSL_CTX *tctx = s->initial_ctx;
1234 unsigned char iv[EVP_MAX_IV_LENGTH];
1235 unsigned char key_name[16];
1236
1237 /* get session encoding length */
1238 slen = i2d_SSL_SESSION(s->session, NULL);
1239 /* Some length values are 16 bits, so forget it if session is
1240 * too long
1241 */
1242 if (slen > 0xFF00)
1243 return -1;
1244 /* Grow buffer if need be: the length calculation is as
1245 * follows 12 (DTLS handshake message header) +
1246 * 4 (ticket lifetime hint) + 2 (ticket length) +
1247 * 16 (key name) + max_iv_len (iv length) +
1248 * session_length + max_enc_block_size (max encrypted session
1249 * length) + max_md_size (HMAC).
1250 */
1251 if (!BUF_MEM_grow(s->init_buf,
1252 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1253 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1254 return -1;
1255 senc = malloc(slen);
1256 if (!senc)
1257 return -1;
1258 p = senc;
1259 i2d_SSL_SESSION(s->session, &p);
1260
1261 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1262 EVP_CIPHER_CTX_init(&ctx);
1263 HMAC_CTX_init(&hctx);
1264 /* Initialize HMAC and cipher contexts. If callback present
1265 * it does all the work otherwise use generated values
1266 * from parent ctx.
1267 */
1268 if (tctx->tlsext_ticket_key_cb) {
1269 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1270 &hctx, 1) < 0) {
1271 free(senc);
1272 EVP_CIPHER_CTX_cleanup(&ctx);
1273 return -1;
1274 }
1275 } else {
1276 arc4random_buf(iv, 16);
1277 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1278 tctx->tlsext_tick_aes_key, iv);
1279 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1280 tlsext_tick_md(), NULL);
1281 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1282 }
1283 l2n(s->session->tlsext_tick_lifetime_hint, p);
1284 /* Skip ticket length for now */
1285 p += 2;
1286 /* Output key name */
1287 macstart = p;
1288 memcpy(p, key_name, 16);
1289 p += 16;
1290 /* output IV */
1291 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1292 p += EVP_CIPHER_CTX_iv_length(&ctx);
1293 /* Encrypt session data */
1294 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1295 p += len;
1296 EVP_EncryptFinal(&ctx, p, &len);
1297 p += len;
1298 EVP_CIPHER_CTX_cleanup(&ctx);
1299
1300 HMAC_Update(&hctx, macstart, p - macstart);
1301 HMAC_Final(&hctx, p, &hlen);
1302 HMAC_CTX_cleanup(&hctx);
1303
1304 p += hlen;
1305 /* Now write out lengths: p points to end of data written */
1306 /* Total length */
1307 len = p - (unsigned char *)(s->init_buf->data);
1308 /* Ticket length */
1309 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1310 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1311
1312 /* number of bytes to write */
1313 s->init_num = len;
1314 s->state = SSL3_ST_SW_SESSION_TICKET_B;
1315 s->init_off = 0;
1316 free(senc);
1317
1318 /* XDTLS: set message header ? */
1319 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1320 dtls1_set_message_header(s, (void *)s->init_buf->data,
1321 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1322
1323 /* buffer the message to handle re-xmits */
1324 dtls1_buffer_message(s, 0);
1325 }
1326
1327 /* SSL3_ST_SW_SESSION_TICKET_B */
1328 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1329}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-11-22 22:48:10 +0000