1 /* ssl/d1_srvr.c */
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 #include "ssl_locl.h"
118 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
120 #include <openssl/objects.h>
121 #include <openssl/evp.h>
122 #include <openssl/x509.h>
123 #include <openssl/md5.h>
124 #include <openssl/bn.h>
125 #ifndef OPENSSL_NO_DH
126 # include <openssl/dh.h>
127 #endif
128
129 static const SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
131
dtls1_get_server_method(int ver)132 static const SSL_METHOD *dtls1_get_server_method(int ver)
133 {
134 if (ver == DTLS_ANY_VERSION)
135 return DTLS_server_method();
136 else if (ver == DTLS1_VERSION)
137 return DTLSv1_server_method();
138 else if (ver == DTLS1_2_VERSION)
139 return DTLSv1_2_server_method();
140 else
141 return NULL;
142 }
143
IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,DTLSv1_server_method,dtls1_accept,ssl_undefined_function,dtls1_get_server_method,DTLSv1_enc_data)144 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
145 DTLSv1_server_method,
146 dtls1_accept,
147 ssl_undefined_function,
148 dtls1_get_server_method, DTLSv1_enc_data)
149
150 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
151 DTLSv1_2_server_method,
152 dtls1_accept,
153 ssl_undefined_function,
154 dtls1_get_server_method, DTLSv1_2_enc_data)
155
156 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
157 DTLS_server_method,
158 dtls1_accept,
159 ssl_undefined_function,
160 dtls1_get_server_method, DTLSv1_2_enc_data)
161
162 int dtls1_accept(SSL *s)
163 {
164 BUF_MEM *buf;
165 unsigned long Time = (unsigned long)time(NULL);
166 void (*cb) (const SSL *ssl, int type, int val) = NULL;
167 unsigned long alg_k;
168 int ret = -1;
169 int new_state, state, skip = 0;
170 int listen;
171 #ifndef OPENSSL_NO_SCTP
172 unsigned char sctpauthkey[64];
173 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
174 #endif
175
176 RAND_add(&Time, sizeof(Time), 0);
177 ERR_clear_error();
178 clear_sys_error();
179
180 if (s->info_callback != NULL)
181 cb = s->info_callback;
182 else if (s->ctx->info_callback != NULL)
183 cb = s->ctx->info_callback;
184
185 listen = s->d1->listen;
186
187 /* init things to blank */
188 s->in_handshake++;
189 if (!SSL_in_init(s) || SSL_in_before(s))
190 SSL_clear(s);
191
192 s->d1->listen = listen;
193 #ifndef OPENSSL_NO_SCTP
194 /*
195 * Notify SCTP BIO socket to enter handshake mode and prevent stream
196 * identifier other than 0. Will be ignored if no SCTP is used.
197 */
198 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
199 s->in_handshake, NULL);
200 #endif
201
202 if (s->cert == NULL) {
203 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
204 return (-1);
205 }
206 #ifndef OPENSSL_NO_HEARTBEATS
207 /*
208 * If we're awaiting a HeartbeatResponse, pretend we already got and
209 * don't await it anymore, because Heartbeats don't make sense during
210 * handshakes anyway.
211 */
212 if (s->tlsext_hb_pending) {
213 dtls1_stop_timer(s);
214 s->tlsext_hb_pending = 0;
215 s->tlsext_hb_seq++;
216 }
217 #endif
218
219 for (;;) {
220 state = s->state;
221
222 switch (s->state) {
223 case SSL_ST_RENEGOTIATE:
224 s->renegotiate = 1;
225 /* s->state=SSL_ST_ACCEPT; */
226
227 case SSL_ST_BEFORE:
228 case SSL_ST_ACCEPT:
229 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
230 case SSL_ST_OK | SSL_ST_ACCEPT:
231
232 s->server = 1;
233 if (cb != NULL)
234 cb(s, SSL_CB_HANDSHAKE_START, 1);
235
236 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
237 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
238 return -1;
239 }
240 s->type = SSL_ST_ACCEPT;
241
242 if (s->init_buf == NULL) {
243 if ((buf = BUF_MEM_new()) == NULL) {
244 ret = -1;
245 s->state = SSL_ST_ERR;
246 goto end;
247 }
248 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
249 BUF_MEM_free(buf);
250 ret = -1;
251 s->state = SSL_ST_ERR;
252 goto end;
253 }
254 s->init_buf = buf;
255 }
256
257 if (!ssl3_setup_buffers(s)) {
258 ret = -1;
259 s->state = SSL_ST_ERR;
260 goto end;
261 }
262
263 s->init_num = 0;
264 s->d1->change_cipher_spec_ok = 0;
265 /*
266 * Should have been reset by ssl3_get_finished, too.
267 */
268 s->s3->change_cipher_spec = 0;
269
270 if (s->state != SSL_ST_RENEGOTIATE) {
271 /*
272 * Ok, we now need to push on a buffering BIO so that the
273 * output is sent in a way that TCP likes :-) ...but not with
274 * SCTP :-)
275 */
276 #ifndef OPENSSL_NO_SCTP
277 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
278 #endif
279 if (!ssl_init_wbio_buffer(s, 1)) {
280 ret = -1;
281 s->state = SSL_ST_ERR;
282 goto end;
283 }
284
285 ssl3_init_finished_mac(s);
286 s->state = SSL3_ST_SR_CLNT_HELLO_A;
287 s->ctx->stats.sess_accept++;
288 } else if (!s->s3->send_connection_binding &&
289 !(s->options &
290 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
291 /*
292 * Server attempting to renegotiate with client that doesn't
293 * support secure renegotiation.
294 */
295 SSLerr(SSL_F_DTLS1_ACCEPT,
296 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
297 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
298 ret = -1;
299 s->state = SSL_ST_ERR;
300 goto end;
301 } else {
302 /*
303 * s->state == SSL_ST_RENEGOTIATE, we will just send a
304 * HelloRequest
305 */
306 s->ctx->stats.sess_accept_renegotiate++;
307 s->state = SSL3_ST_SW_HELLO_REQ_A;
308 }
309
310 break;
311
312 case SSL3_ST_SW_HELLO_REQ_A:
313 case SSL3_ST_SW_HELLO_REQ_B:
314
315 s->shutdown = 0;
316 dtls1_clear_sent_buffer(s);
317 dtls1_start_timer(s);
318 ret = ssl3_send_hello_request(s);
319 if (ret <= 0)
320 goto end;
321 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
322 s->state = SSL3_ST_SW_FLUSH;
323 s->init_num = 0;
324
325 ssl3_init_finished_mac(s);
326 break;
327
328 case SSL3_ST_SW_HELLO_REQ_C:
329 s->state = SSL_ST_OK;
330 break;
331
332 case SSL3_ST_SR_CLNT_HELLO_A:
333 case SSL3_ST_SR_CLNT_HELLO_B:
334 case SSL3_ST_SR_CLNT_HELLO_C:
335
336 s->shutdown = 0;
337 ret = ssl3_get_client_hello(s);
338 if (ret <= 0)
339 goto end;
340 dtls1_stop_timer(s);
341
342 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
343 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
344 else
345 s->state = SSL3_ST_SW_SRVR_HELLO_A;
346
347 s->init_num = 0;
348
349 /*
350 * Reflect ClientHello sequence to remain stateless while
351 * listening
352 */
353 if (listen) {
354 memcpy(s->s3->write_sequence, s->s3->read_sequence,
355 sizeof(s->s3->write_sequence));
356 }
357
358 /* If we're just listening, stop here */
359 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
360 ret = 2;
361 s->d1->listen = 0;
362 /*
363 * Set expected sequence numbers to continue the handshake.
364 */
365 s->d1->handshake_read_seq = 2;
366 s->d1->handshake_write_seq = 1;
367 s->d1->next_handshake_write_seq = 1;
368 goto end;
369 }
370
371 break;
372
373 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
374 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
375
376 ret = dtls1_send_hello_verify_request(s);
377 if (ret <= 0)
378 goto end;
379 s->state = SSL3_ST_SW_FLUSH;
380 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
381
382 /* HelloVerifyRequest resets Finished MAC */
383 if (s->version != DTLS1_BAD_VER)
384 ssl3_init_finished_mac(s);
385 break;
386
387 #ifndef OPENSSL_NO_SCTP
388 case DTLS1_SCTP_ST_SR_READ_SOCK:
389
390 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
391 s->s3->in_read_app_data = 2;
392 s->rwstate = SSL_READING;
393 BIO_clear_retry_flags(SSL_get_rbio(s));
394 BIO_set_retry_read(SSL_get_rbio(s));
395 ret = -1;
396 goto end;
397 }
398
399 s->state = SSL3_ST_SR_FINISHED_A;
400 break;
401
402 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
403 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
404 if (ret < 0)
405 goto end;
406
407 if (ret == 0) {
408 if (s->d1->next_state != SSL_ST_OK) {
409 s->s3->in_read_app_data = 2;
410 s->rwstate = SSL_READING;
411 BIO_clear_retry_flags(SSL_get_rbio(s));
412 BIO_set_retry_read(SSL_get_rbio(s));
413 ret = -1;
414 goto end;
415 }
416 }
417
418 s->state = s->d1->next_state;
419 break;
420 #endif
421
422 case SSL3_ST_SW_SRVR_HELLO_A:
423 case SSL3_ST_SW_SRVR_HELLO_B:
424 s->renegotiate = 2;
425 dtls1_start_timer(s);
426 ret = ssl3_send_server_hello(s);
427 if (ret <= 0)
428 goto end;
429
430 if (s->hit) {
431 #ifndef OPENSSL_NO_SCTP
432 /*
433 * Add new shared key for SCTP-Auth, will be ignored if no
434 * SCTP used.
435 */
436 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
437 DTLS1_SCTP_AUTH_LABEL);
438
439 if (SSL_export_keying_material(s, sctpauthkey,
440 sizeof(sctpauthkey), labelbuffer,
441 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
442 ret = -1;
443 s->state = SSL_ST_ERR;
444 goto end;
445 }
446
447 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
448 sizeof(sctpauthkey), sctpauthkey);
449 #endif
450 #ifndef OPENSSL_NO_TLSEXT
451 if (s->tlsext_ticket_expected)
452 s->state = SSL3_ST_SW_SESSION_TICKET_A;
453 else
454 s->state = SSL3_ST_SW_CHANGE_A;
455 #else
456 s->state = SSL3_ST_SW_CHANGE_A;
457 #endif
458 } else
459 s->state = SSL3_ST_SW_CERT_A;
460 s->init_num = 0;
461 break;
462
463 case SSL3_ST_SW_CERT_A:
464 case SSL3_ST_SW_CERT_B:
465 /* Check if it is anon DH or normal PSK */
466 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
467 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
468 dtls1_start_timer(s);
469 ret = ssl3_send_server_certificate(s);
470 if (ret <= 0)
471 goto end;
472 #ifndef OPENSSL_NO_TLSEXT
473 if (s->tlsext_status_expected)
474 s->state = SSL3_ST_SW_CERT_STATUS_A;
475 else
476 s->state = SSL3_ST_SW_KEY_EXCH_A;
477 } else {
478 skip = 1;
479 s->state = SSL3_ST_SW_KEY_EXCH_A;
480 }
481 #else
482 } else
483 skip = 1;
484
485 s->state = SSL3_ST_SW_KEY_EXCH_A;
486 #endif
487 s->init_num = 0;
488 break;
489
490 case SSL3_ST_SW_KEY_EXCH_A:
491 case SSL3_ST_SW_KEY_EXCH_B:
492 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
493
494 /*
495 * clear this, it may get reset by
496 * send_server_key_exchange
497 */
498 s->s3->tmp.use_rsa_tmp = 0;
499
500 /*
501 * only send if a DH key exchange or RSA but we have a sign only
502 * certificate
503 */
504 if (0
505 /*
506 * PSK: send ServerKeyExchange if PSK identity hint if
507 * provided
508 */
509 #ifndef OPENSSL_NO_PSK
510 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
511 #endif
512 || (alg_k & SSL_kDHE)
513 || (alg_k & SSL_kEECDH)
514 || ((alg_k & SSL_kRSA)
515 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
516 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
517 && EVP_PKEY_size(s->cert->pkeys
518 [SSL_PKEY_RSA_ENC].privatekey) *
519 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
520 )
521 )
522 )
523 ) {
524 dtls1_start_timer(s);
525 ret = ssl3_send_server_key_exchange(s);
526 if (ret <= 0)
527 goto end;
528 } else
529 skip = 1;
530
531 s->state = SSL3_ST_SW_CERT_REQ_A;
532 s->init_num = 0;
533 break;
534
535 case SSL3_ST_SW_CERT_REQ_A:
536 case SSL3_ST_SW_CERT_REQ_B:
537 if ( /* don't request cert unless asked for it: */
538 !(s->verify_mode & SSL_VERIFY_PEER) ||
539 /*
540 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
541 * during re-negotiation:
542 */
543 ((s->session->peer != NULL) &&
544 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
545 /*
546 * never request cert in anonymous ciphersuites (see
547 * section "Certificate request" in SSL 3 drafts and in
548 * RFC 2246):
549 */
550 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
551 /*
552 * ... except when the application insists on
553 * verification (against the specs, but s3_clnt.c accepts
554 * this for SSL 3)
555 */
556 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
557 /*
558 * never request cert in Kerberos ciphersuites
559 */
560 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
561 /*
562 * With normal PSK Certificates and Certificate Requests
563 * are omitted
564 */
565 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
566 /* no cert request */
567 skip = 1;
568 s->s3->tmp.cert_request = 0;
569 s->state = SSL3_ST_SW_SRVR_DONE_A;
570 #ifndef OPENSSL_NO_SCTP
571 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
572 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
573 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
574 }
575 #endif
576 } else {
577 s->s3->tmp.cert_request = 1;
578 dtls1_start_timer(s);
579 ret = ssl3_send_certificate_request(s);
580 if (ret <= 0)
581 goto end;
582 #ifndef NETSCAPE_HANG_BUG
583 s->state = SSL3_ST_SW_SRVR_DONE_A;
584 # ifndef OPENSSL_NO_SCTP
585 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
586 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
587 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
588 }
589 # endif
590 #else
591 s->state = SSL3_ST_SW_FLUSH;
592 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
593 # ifndef OPENSSL_NO_SCTP
594 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
595 s->d1->next_state = s->s3->tmp.next_state;
596 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
597 }
598 # endif
599 #endif
600 s->init_num = 0;
601 }
602 break;
603
604 case SSL3_ST_SW_SRVR_DONE_A:
605 case SSL3_ST_SW_SRVR_DONE_B:
606 dtls1_start_timer(s);
607 ret = ssl3_send_server_done(s);
608 if (ret <= 0)
609 goto end;
610 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
611 s->state = SSL3_ST_SW_FLUSH;
612 s->init_num = 0;
613 break;
614
615 case SSL3_ST_SW_FLUSH:
616 s->rwstate = SSL_WRITING;
617 if (BIO_flush(s->wbio) <= 0) {
618 /*
619 * If the write error was fatal, stop trying
620 */
621 if (!BIO_should_retry(s->wbio)) {
622 s->rwstate = SSL_NOTHING;
623 s->state = s->s3->tmp.next_state;
624 }
625
626 ret = -1;
627 goto end;
628 }
629 s->rwstate = SSL_NOTHING;
630 s->state = s->s3->tmp.next_state;
631 break;
632
633 case SSL3_ST_SR_CERT_A:
634 case SSL3_ST_SR_CERT_B:
635 if (s->s3->tmp.cert_request) {
636 ret = ssl3_get_client_certificate(s);
637 if (ret <= 0)
638 goto end;
639 }
640 s->init_num = 0;
641 s->state = SSL3_ST_SR_KEY_EXCH_A;
642 break;
643
644 case SSL3_ST_SR_KEY_EXCH_A:
645 case SSL3_ST_SR_KEY_EXCH_B:
646 ret = ssl3_get_client_key_exchange(s);
647 if (ret <= 0)
648 goto end;
649 #ifndef OPENSSL_NO_SCTP
650 /*
651 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
652 * used.
653 */
654 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
655 DTLS1_SCTP_AUTH_LABEL);
656
657 if (SSL_export_keying_material(s, sctpauthkey,
658 sizeof(sctpauthkey), labelbuffer,
659 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
660 ret = -1;
661 s->state = SSL_ST_ERR;
662 goto end;
663 }
664
665 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
666 sizeof(sctpauthkey), sctpauthkey);
667 #endif
668
669 s->state = SSL3_ST_SR_CERT_VRFY_A;
670 s->init_num = 0;
671
672 if (ret == 2) {
673 /*
674 * For the ECDH ciphersuites when the client sends its ECDH
675 * pub key in a certificate, the CertificateVerify message is
676 * not sent.
677 */
678 s->state = SSL3_ST_SR_FINISHED_A;
679 s->init_num = 0;
680 } else if (SSL_USE_SIGALGS(s)) {
681 s->state = SSL3_ST_SR_CERT_VRFY_A;
682 s->init_num = 0;
683 if (!s->session->peer)
684 break;
685 /*
686 * For sigalgs freeze the handshake buffer at this point and
687 * digest cached records.
688 */
689 if (!s->s3->handshake_buffer) {
690 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
691 s->state = SSL_ST_ERR;
692 return -1;
693 }
694 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
695 if (!ssl3_digest_cached_records(s)) {
696 s->state = SSL_ST_ERR;
697 return -1;
698 }
699 } else {
700 s->state = SSL3_ST_SR_CERT_VRFY_A;
701 s->init_num = 0;
702
703 /*
704 * We need to get hashes here so if there is a client cert,
705 * it can be verified
706 */
707 s->method->ssl3_enc->cert_verify_mac(s,
708 NID_md5,
709 &(s->s3->
710 tmp.cert_verify_md
711 [0]));
712 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
713 &(s->s3->
714 tmp.cert_verify_md
715 [MD5_DIGEST_LENGTH]));
716 }
717 break;
718
719 case SSL3_ST_SR_CERT_VRFY_A:
720 case SSL3_ST_SR_CERT_VRFY_B:
721 ret = ssl3_get_cert_verify(s);
722 if (ret <= 0)
723 goto end;
724 #ifndef OPENSSL_NO_SCTP
725 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
726 state == SSL_ST_RENEGOTIATE)
727 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
728 else
729 #endif
730 s->state = SSL3_ST_SR_FINISHED_A;
731 s->init_num = 0;
732 break;
733
734 case SSL3_ST_SR_FINISHED_A:
735 case SSL3_ST_SR_FINISHED_B:
736 /*
737 * Enable CCS. Receiving a CCS clears the flag, so make
738 * sure not to re-enable it to ban duplicates. This *should* be the
739 * first time we have received one - but we check anyway to be
740 * cautious.
741 * s->s3->change_cipher_spec is set when a CCS is
742 * processed in d1_pkt.c, and remains set until
743 * the client's Finished message is read.
744 */
745 if (!s->s3->change_cipher_spec)
746 s->d1->change_cipher_spec_ok = 1;
747 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
748 SSL3_ST_SR_FINISHED_B);
749 if (ret <= 0)
750 goto end;
751 dtls1_stop_timer(s);
752 if (s->hit)
753 s->state = SSL_ST_OK;
754 #ifndef OPENSSL_NO_TLSEXT
755 else if (s->tlsext_ticket_expected)
756 s->state = SSL3_ST_SW_SESSION_TICKET_A;
757 #endif
758 else
759 s->state = SSL3_ST_SW_CHANGE_A;
760 s->init_num = 0;
761 break;
762
763 #ifndef OPENSSL_NO_TLSEXT
764 case SSL3_ST_SW_SESSION_TICKET_A:
765 case SSL3_ST_SW_SESSION_TICKET_B:
766 ret = ssl3_send_newsession_ticket(s);
767 if (ret <= 0)
768 goto end;
769 s->state = SSL3_ST_SW_CHANGE_A;
770 s->init_num = 0;
771 break;
772
773 case SSL3_ST_SW_CERT_STATUS_A:
774 case SSL3_ST_SW_CERT_STATUS_B:
775 ret = ssl3_send_cert_status(s);
776 if (ret <= 0)
777 goto end;
778 s->state = SSL3_ST_SW_KEY_EXCH_A;
779 s->init_num = 0;
780 break;
781
782 #endif
783
784 case SSL3_ST_SW_CHANGE_A:
785 case SSL3_ST_SW_CHANGE_B:
786
787 s->session->cipher = s->s3->tmp.new_cipher;
788 if (!s->method->ssl3_enc->setup_key_block(s)) {
789 ret = -1;
790 s->state = SSL_ST_ERR;
791 goto end;
792 }
793
794 ret = dtls1_send_change_cipher_spec(s,
795 SSL3_ST_SW_CHANGE_A,
796 SSL3_ST_SW_CHANGE_B);
797
798 if (ret <= 0)
799 goto end;
800
801 #ifndef OPENSSL_NO_SCTP
802 if (!s->hit) {
803 /*
804 * Change to new shared key of SCTP-Auth, will be ignored if
805 * no SCTP used.
806 */
807 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
808 0, NULL);
809 }
810 #endif
811
812 s->state = SSL3_ST_SW_FINISHED_A;
813 s->init_num = 0;
814
815 if (!s->method->ssl3_enc->change_cipher_state(s,
816 SSL3_CHANGE_CIPHER_SERVER_WRITE))
817 {
818 ret = -1;
819 s->state = SSL_ST_ERR;
820 goto end;
821 }
822
823 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
824 break;
825
826 case SSL3_ST_SW_FINISHED_A:
827 case SSL3_ST_SW_FINISHED_B:
828 ret = ssl3_send_finished(s,
829 SSL3_ST_SW_FINISHED_A,
830 SSL3_ST_SW_FINISHED_B,
831 s->method->
832 ssl3_enc->server_finished_label,
833 s->method->
834 ssl3_enc->server_finished_label_len);
835 if (ret <= 0)
836 goto end;
837 s->state = SSL3_ST_SW_FLUSH;
838 if (s->hit) {
839 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
840
841 #ifndef OPENSSL_NO_SCTP
842 /*
843 * Change to new shared key of SCTP-Auth, will be ignored if
844 * no SCTP used.
845 */
846 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
847 0, NULL);
848 #endif
849 } else {
850 s->s3->tmp.next_state = SSL_ST_OK;
851 #ifndef OPENSSL_NO_SCTP
852 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
853 s->d1->next_state = s->s3->tmp.next_state;
854 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
855 }
856 #endif
857 }
858 s->init_num = 0;
859 break;
860
861 case SSL_ST_OK:
862 /* clean a few things up */
863 ssl3_cleanup_key_block(s);
864
865 #if 0
866 BUF_MEM_free(s->init_buf);
867 s->init_buf = NULL;
868 #endif
869
870 /* remove buffering on output */
871 ssl_free_wbio_buffer(s);
872
873 s->init_num = 0;
874
875 if (s->renegotiate == 2) { /* skipped if we just sent a
876 * HelloRequest */
877 s->renegotiate = 0;
878 s->new_session = 0;
879
880 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
881
882 s->ctx->stats.sess_accept_good++;
883 /* s->server=1; */
884 s->handshake_func = dtls1_accept;
885
886 if (cb != NULL)
887 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
888 }
889
890 ret = 1;
891
892 /* done handshaking, next message is client hello */
893 s->d1->handshake_read_seq = 0;
894 /* next message is server hello */
895 s->d1->handshake_write_seq = 0;
896 s->d1->next_handshake_write_seq = 0;
897 dtls1_clear_received_buffer(s);
898 goto end;
899 /* break; */
900
901 case SSL_ST_ERR:
902 default:
903 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
904 ret = -1;
905 goto end;
906 /* break; */
907 }
908
909 if (!s->s3->tmp.reuse_message && !skip) {
910 if (s->debug) {
911 if ((ret = BIO_flush(s->wbio)) <= 0)
912 goto end;
913 }
914
915 if ((cb != NULL) && (s->state != state)) {
916 new_state = s->state;
917 s->state = state;
918 cb(s, SSL_CB_ACCEPT_LOOP, 1);
919 s->state = new_state;
920 }
921 }
922 skip = 0;
923 }
924 end:
925 /* BIO_flush(s->wbio); */
926
927 s->in_handshake--;
928 #ifndef OPENSSL_NO_SCTP
929 /*
930 * Notify SCTP BIO socket to leave handshake mode and prevent stream
931 * identifier other than 0. Will be ignored if no SCTP is used.
932 */
933 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
934 s->in_handshake, NULL);
935 #endif
936
937 if (cb != NULL)
938 cb(s, SSL_CB_ACCEPT_EXIT, ret);
939 return (ret);
940 }
941
dtls1_send_hello_verify_request(SSL * s)942 int dtls1_send_hello_verify_request(SSL *s)
943 {
944 unsigned int msg_len;
945 unsigned char *msg, *buf, *p;
946
947 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
948 buf = (unsigned char *)s->init_buf->data;
949
950 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
951 /* Always use DTLS 1.0 version: see RFC 6347 */
952 *(p++) = DTLS1_VERSION >> 8;
953 *(p++) = DTLS1_VERSION & 0xFF;
954
955 if (s->ctx->app_gen_cookie_cb == NULL ||
956 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
957 &(s->d1->cookie_len)) == 0) {
958 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
959 ERR_R_INTERNAL_ERROR);
960 s->state = SSL_ST_ERR;
961 return 0;
962 }
963
964 *(p++) = (unsigned char)s->d1->cookie_len;
965 memcpy(p, s->d1->cookie, s->d1->cookie_len);
966 p += s->d1->cookie_len;
967 msg_len = p - msg;
968
969 dtls1_set_message_header(s, buf,
970 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
971 msg_len);
972
973 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
974 /* number of bytes to write */
975 s->init_num = p - buf;
976 s->init_off = 0;
977 }
978
979 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
980 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
981 }
982