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 == DTLS1_VERSION)
135 return (DTLSv1_server_method());
136 else
137 return (NULL);
138 }
139
IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,dtls1_accept,ssl_undefined_function,dtls1_get_server_method)140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
141 dtls1_accept,
142 ssl_undefined_function, dtls1_get_server_method)
143
144 int dtls1_accept(SSL *s)
145 {
146 BUF_MEM *buf;
147 unsigned long Time = (unsigned long)time(NULL);
148 void (*cb) (const SSL *ssl, int type, int val) = NULL;
149 unsigned long alg_k;
150 int ret = -1;
151 int new_state, state, skip = 0;
152 int listen;
153 #ifndef OPENSSL_NO_SCTP
154 unsigned char sctpauthkey[64];
155 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
156 #endif
157
158 RAND_add(&Time, sizeof(Time), 0);
159 ERR_clear_error();
160 clear_sys_error();
161
162 if (s->info_callback != NULL)
163 cb = s->info_callback;
164 else if (s->ctx->info_callback != NULL)
165 cb = s->ctx->info_callback;
166
167 listen = s->d1->listen;
168
169 /* init things to blank */
170 s->in_handshake++;
171 if (!SSL_in_init(s) || SSL_in_before(s))
172 SSL_clear(s);
173
174 s->d1->listen = listen;
175 #ifndef OPENSSL_NO_SCTP
176 /*
177 * Notify SCTP BIO socket to enter handshake mode and prevent stream
178 * identifier other than 0. Will be ignored if no SCTP is used.
179 */
180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
181 s->in_handshake, NULL);
182 #endif
183
184 if (s->cert == NULL) {
185 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
186 return (-1);
187 }
188 #ifndef OPENSSL_NO_HEARTBEATS
189 /*
190 * If we're awaiting a HeartbeatResponse, pretend we already got and
191 * don't await it anymore, because Heartbeats don't make sense during
192 * handshakes anyway.
193 */
194 if (s->tlsext_hb_pending) {
195 dtls1_stop_timer(s);
196 s->tlsext_hb_pending = 0;
197 s->tlsext_hb_seq++;
198 }
199 #endif
200
201 for (;;) {
202 state = s->state;
203
204 switch (s->state) {
205 case SSL_ST_RENEGOTIATE:
206 s->renegotiate = 1;
207 /* s->state=SSL_ST_ACCEPT; */
208
209 case SSL_ST_BEFORE:
210 case SSL_ST_ACCEPT:
211 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
212 case SSL_ST_OK | SSL_ST_ACCEPT:
213
214 s->server = 1;
215 if (cb != NULL)
216 cb(s, SSL_CB_HANDSHAKE_START, 1);
217
218 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
219 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
220 return -1;
221 }
222 s->type = SSL_ST_ACCEPT;
223
224 if (s->init_buf == NULL) {
225 if ((buf = BUF_MEM_new()) == NULL) {
226 ret = -1;
227 s->state = SSL_ST_ERR;
228 goto end;
229 }
230 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
231 BUF_MEM_free(buf);
232 ret = -1;
233 s->state = SSL_ST_ERR;
234 goto end;
235 }
236 s->init_buf = buf;
237 }
238
239 if (!ssl3_setup_buffers(s)) {
240 ret = -1;
241 s->state = SSL_ST_ERR;
242 goto end;
243 }
244
245 s->init_num = 0;
246 s->d1->change_cipher_spec_ok = 0;
247 /*
248 * Should have been reset by ssl3_get_finished, too.
249 */
250 s->s3->change_cipher_spec = 0;
251
252 if (s->state != SSL_ST_RENEGOTIATE) {
253 /*
254 * Ok, we now need to push on a buffering BIO so that the
255 * output is sent in a way that TCP likes :-) ...but not with
256 * SCTP :-)
257 */
258 #ifndef OPENSSL_NO_SCTP
259 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
260 #endif
261 if (!ssl_init_wbio_buffer(s, 1)) {
262 ret = -1;
263 s->state = SSL_ST_ERR;
264 goto end;
265 }
266
267 ssl3_init_finished_mac(s);
268 s->state = SSL3_ST_SR_CLNT_HELLO_A;
269 s->ctx->stats.sess_accept++;
270 } else if (!s->s3->send_connection_binding &&
271 !(s->options &
272 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
273 /*
274 * Server attempting to renegotiate with client that doesn't
275 * support secure renegotiation.
276 */
277 SSLerr(SSL_F_DTLS1_ACCEPT,
278 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
279 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
280 ret = -1;
281 s->state = SSL_ST_ERR;
282 goto end;
283 } else {
284 /*
285 * s->state == SSL_ST_RENEGOTIATE, we will just send a
286 * HelloRequest
287 */
288 s->ctx->stats.sess_accept_renegotiate++;
289 s->state = SSL3_ST_SW_HELLO_REQ_A;
290 }
291
292 break;
293
294 case SSL3_ST_SW_HELLO_REQ_A:
295 case SSL3_ST_SW_HELLO_REQ_B:
296
297 s->shutdown = 0;
298 dtls1_clear_sent_buffer(s);
299 dtls1_start_timer(s);
300 ret = dtls1_send_hello_request(s);
301 if (ret <= 0)
302 goto end;
303 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
304 s->state = SSL3_ST_SW_FLUSH;
305 s->init_num = 0;
306
307 ssl3_init_finished_mac(s);
308 break;
309
310 case SSL3_ST_SW_HELLO_REQ_C:
311 s->state = SSL_ST_OK;
312 break;
313
314 case SSL3_ST_SR_CLNT_HELLO_A:
315 case SSL3_ST_SR_CLNT_HELLO_B:
316 case SSL3_ST_SR_CLNT_HELLO_C:
317
318 s->shutdown = 0;
319 ret = ssl3_get_client_hello(s);
320 if (ret <= 0)
321 goto end;
322 dtls1_stop_timer(s);
323
324 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
325 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
326 else
327 s->state = SSL3_ST_SW_SRVR_HELLO_A;
328
329 s->init_num = 0;
330
331 /*
332 * Reflect ClientHello sequence to remain stateless while
333 * listening
334 */
335 if (listen) {
336 memcpy(s->s3->write_sequence, s->s3->read_sequence,
337 sizeof(s->s3->write_sequence));
338 }
339
340 /* If we're just listening, stop here */
341 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
342 ret = 2;
343 s->d1->listen = 0;
344 /*
345 * Set expected sequence numbers to continue the handshake.
346 */
347 s->d1->handshake_read_seq = 2;
348 s->d1->handshake_write_seq = 1;
349 s->d1->next_handshake_write_seq = 1;
350 goto end;
351 }
352
353 break;
354
355 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
356 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
357
358 ret = dtls1_send_hello_verify_request(s);
359 if (ret <= 0)
360 goto end;
361 s->state = SSL3_ST_SW_FLUSH;
362 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
363
364 /* HelloVerifyRequest resets Finished MAC */
365 if (s->version != DTLS1_BAD_VER)
366 ssl3_init_finished_mac(s);
367 break;
368
369 #ifndef OPENSSL_NO_SCTP
370 case DTLS1_SCTP_ST_SR_READ_SOCK:
371
372 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
373 s->s3->in_read_app_data = 2;
374 s->rwstate = SSL_READING;
375 BIO_clear_retry_flags(SSL_get_rbio(s));
376 BIO_set_retry_read(SSL_get_rbio(s));
377 ret = -1;
378 goto end;
379 }
380
381 s->state = SSL3_ST_SR_FINISHED_A;
382 break;
383
384 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
385 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
386 if (ret < 0)
387 goto end;
388
389 if (ret == 0) {
390 if (s->d1->next_state != SSL_ST_OK) {
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
400 s->state = s->d1->next_state;
401 break;
402 #endif
403
404 case SSL3_ST_SW_SRVR_HELLO_A:
405 case SSL3_ST_SW_SRVR_HELLO_B:
406 s->renegotiate = 2;
407 dtls1_start_timer(s);
408 ret = dtls1_send_server_hello(s);
409 if (ret <= 0)
410 goto end;
411
412 if (s->hit) {
413 #ifndef OPENSSL_NO_SCTP
414 /*
415 * Add new shared key for SCTP-Auth, will be ignored if no
416 * SCTP used.
417 */
418 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
419 DTLS1_SCTP_AUTH_LABEL);
420
421 if (SSL_export_keying_material(s, sctpauthkey,
422 sizeof(sctpauthkey), labelbuffer,
423 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
424 ret = -1;
425 s->state = SSL_ST_ERR;
426 goto end;
427 }
428
429 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
430 sizeof(sctpauthkey), sctpauthkey);
431 #endif
432 #ifndef OPENSSL_NO_TLSEXT
433 if (s->tlsext_ticket_expected)
434 s->state = SSL3_ST_SW_SESSION_TICKET_A;
435 else
436 s->state = SSL3_ST_SW_CHANGE_A;
437 #else
438 s->state = SSL3_ST_SW_CHANGE_A;
439 #endif
440 } else
441 s->state = SSL3_ST_SW_CERT_A;
442 s->init_num = 0;
443 break;
444
445 case SSL3_ST_SW_CERT_A:
446 case SSL3_ST_SW_CERT_B:
447 /* Check if it is anon DH or normal PSK */
448 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
449 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
450 dtls1_start_timer(s);
451 ret = dtls1_send_server_certificate(s);
452 if (ret <= 0)
453 goto end;
454 #ifndef OPENSSL_NO_TLSEXT
455 if (s->tlsext_status_expected)
456 s->state = SSL3_ST_SW_CERT_STATUS_A;
457 else
458 s->state = SSL3_ST_SW_KEY_EXCH_A;
459 } else {
460 skip = 1;
461 s->state = SSL3_ST_SW_KEY_EXCH_A;
462 }
463 #else
464 } else
465 skip = 1;
466
467 s->state = SSL3_ST_SW_KEY_EXCH_A;
468 #endif
469 s->init_num = 0;
470 break;
471
472 case SSL3_ST_SW_KEY_EXCH_A:
473 case SSL3_ST_SW_KEY_EXCH_B:
474 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
475
476 /*
477 * clear this, it may get reset by
478 * send_server_key_exchange
479 */
480 s->s3->tmp.use_rsa_tmp = 0;
481
482 /*
483 * only send if a DH key exchange or RSA but we have a sign only
484 * certificate
485 */
486 if (0
487 /*
488 * PSK: send ServerKeyExchange if PSK identity hint if
489 * provided
490 */
491 #ifndef OPENSSL_NO_PSK
492 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
493 #endif
494 || (alg_k & SSL_kEDH)
495 || (alg_k & SSL_kEECDH)
496 || ((alg_k & SSL_kRSA)
497 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
498 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
499 && EVP_PKEY_size(s->cert->pkeys
500 [SSL_PKEY_RSA_ENC].privatekey) *
501 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
502 )
503 )
504 )
505 ) {
506 dtls1_start_timer(s);
507 ret = dtls1_send_server_key_exchange(s);
508 if (ret <= 0)
509 goto end;
510 } else
511 skip = 1;
512
513 s->state = SSL3_ST_SW_CERT_REQ_A;
514 s->init_num = 0;
515 break;
516
517 case SSL3_ST_SW_CERT_REQ_A:
518 case SSL3_ST_SW_CERT_REQ_B:
519 if ( /* don't request cert unless asked for it: */
520 !(s->verify_mode & SSL_VERIFY_PEER) ||
521 /*
522 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
523 * during re-negotiation:
524 */
525 ((s->session->peer != NULL) &&
526 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
527 /*
528 * never request cert in anonymous ciphersuites (see
529 * section "Certificate request" in SSL 3 drafts and in
530 * RFC 2246):
531 */
532 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
533 /*
534 * ... except when the application insists on
535 * verification (against the specs, but s3_clnt.c accepts
536 * this for SSL 3)
537 */
538 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
539 /*
540 * never request cert in Kerberos ciphersuites
541 */
542 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
543 /*
544 * With normal PSK Certificates and Certificate Requests
545 * are omitted
546 */
547 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
548 /* no cert request */
549 skip = 1;
550 s->s3->tmp.cert_request = 0;
551 s->state = SSL3_ST_SW_SRVR_DONE_A;
552 #ifndef OPENSSL_NO_SCTP
553 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
554 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
555 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
556 }
557 #endif
558 } else {
559 s->s3->tmp.cert_request = 1;
560 dtls1_start_timer(s);
561 ret = dtls1_send_certificate_request(s);
562 if (ret <= 0)
563 goto end;
564 #ifndef NETSCAPE_HANG_BUG
565 s->state = SSL3_ST_SW_SRVR_DONE_A;
566 # ifndef OPENSSL_NO_SCTP
567 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
568 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
569 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
570 }
571 # endif
572 #else
573 s->state = SSL3_ST_SW_FLUSH;
574 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
575 # ifndef OPENSSL_NO_SCTP
576 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
577 s->d1->next_state = s->s3->tmp.next_state;
578 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
579 }
580 # endif
581 #endif
582 s->init_num = 0;
583 }
584 break;
585
586 case SSL3_ST_SW_SRVR_DONE_A:
587 case SSL3_ST_SW_SRVR_DONE_B:
588 dtls1_start_timer(s);
589 ret = dtls1_send_server_done(s);
590 if (ret <= 0)
591 goto end;
592 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
593 s->state = SSL3_ST_SW_FLUSH;
594 s->init_num = 0;
595 break;
596
597 case SSL3_ST_SW_FLUSH:
598 s->rwstate = SSL_WRITING;
599 if (BIO_flush(s->wbio) <= 0) {
600 /*
601 * If the write error was fatal, stop trying
602 */
603 if (!BIO_should_retry(s->wbio)) {
604 s->rwstate = SSL_NOTHING;
605 s->state = s->s3->tmp.next_state;
606 }
607
608 ret = -1;
609 goto end;
610 }
611 s->rwstate = SSL_NOTHING;
612 s->state = s->s3->tmp.next_state;
613 break;
614
615 case SSL3_ST_SR_CERT_A:
616 case SSL3_ST_SR_CERT_B:
617 /* Check for second client hello (MS SGC) */
618 ret = ssl3_check_client_hello(s);
619 if (ret <= 0)
620 goto end;
621 if (ret == 2) {
622 dtls1_stop_timer(s);
623 s->state = SSL3_ST_SR_CLNT_HELLO_C;
624 } else {
625 if (s->s3->tmp.cert_request) {
626 ret = ssl3_get_client_certificate(s);
627 if (ret <= 0)
628 goto end;
629 }
630 s->init_num = 0;
631 s->state = SSL3_ST_SR_KEY_EXCH_A;
632 }
633 break;
634
635 case SSL3_ST_SR_KEY_EXCH_A:
636 case SSL3_ST_SR_KEY_EXCH_B:
637 ret = ssl3_get_client_key_exchange(s);
638 if (ret <= 0)
639 goto end;
640 #ifndef OPENSSL_NO_SCTP
641 /*
642 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
643 * used.
644 */
645 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
646 DTLS1_SCTP_AUTH_LABEL);
647
648 if (SSL_export_keying_material(s, sctpauthkey,
649 sizeof(sctpauthkey), labelbuffer,
650 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
651 ret = -1;
652 s->state = SSL_ST_ERR;
653 goto end;
654 }
655
656 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
657 sizeof(sctpauthkey), sctpauthkey);
658 #endif
659
660 s->state = SSL3_ST_SR_CERT_VRFY_A;
661 s->init_num = 0;
662
663 if (ret == 2) {
664 /*
665 * For the ECDH ciphersuites when the client sends its ECDH
666 * pub key in a certificate, the CertificateVerify message is
667 * not sent.
668 */
669 s->state = SSL3_ST_SR_FINISHED_A;
670 s->init_num = 0;
671 } else {
672 s->state = SSL3_ST_SR_CERT_VRFY_A;
673 s->init_num = 0;
674
675 /*
676 * We need to get hashes here so if there is a client cert,
677 * it can be verified
678 */
679 s->method->ssl3_enc->cert_verify_mac(s,
680 NID_md5,
681 &(s->s3->
682 tmp.cert_verify_md
683 [0]));
684 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
685 &(s->s3->
686 tmp.cert_verify_md
687 [MD5_DIGEST_LENGTH]));
688 }
689 break;
690
691 case SSL3_ST_SR_CERT_VRFY_A:
692 case SSL3_ST_SR_CERT_VRFY_B:
693 ret = ssl3_get_cert_verify(s);
694 if (ret <= 0)
695 goto end;
696 #ifndef OPENSSL_NO_SCTP
697 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
698 state == SSL_ST_RENEGOTIATE)
699 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
700 else
701 #endif
702 s->state = SSL3_ST_SR_FINISHED_A;
703 s->init_num = 0;
704 break;
705
706 case SSL3_ST_SR_FINISHED_A:
707 case SSL3_ST_SR_FINISHED_B:
708 /*
709 * Enable CCS. Receiving a CCS clears the flag, so make
710 * sure not to re-enable it to ban duplicates. This *should* be the
711 * first time we have received one - but we check anyway to be
712 * cautious.
713 * s->s3->change_cipher_spec is set when a CCS is
714 * processed in d1_pkt.c, and remains set until
715 * the client's Finished message is read.
716 */
717 if (!s->s3->change_cipher_spec)
718 s->d1->change_cipher_spec_ok = 1;
719 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
720 SSL3_ST_SR_FINISHED_B);
721 if (ret <= 0)
722 goto end;
723 dtls1_stop_timer(s);
724 if (s->hit)
725 s->state = SSL_ST_OK;
726 #ifndef OPENSSL_NO_TLSEXT
727 else if (s->tlsext_ticket_expected)
728 s->state = SSL3_ST_SW_SESSION_TICKET_A;
729 #endif
730 else
731 s->state = SSL3_ST_SW_CHANGE_A;
732 s->init_num = 0;
733 break;
734
735 #ifndef OPENSSL_NO_TLSEXT
736 case SSL3_ST_SW_SESSION_TICKET_A:
737 case SSL3_ST_SW_SESSION_TICKET_B:
738 ret = dtls1_send_newsession_ticket(s);
739 if (ret <= 0)
740 goto end;
741 s->state = SSL3_ST_SW_CHANGE_A;
742 s->init_num = 0;
743 break;
744
745 case SSL3_ST_SW_CERT_STATUS_A:
746 case SSL3_ST_SW_CERT_STATUS_B:
747 ret = ssl3_send_cert_status(s);
748 if (ret <= 0)
749 goto end;
750 s->state = SSL3_ST_SW_KEY_EXCH_A;
751 s->init_num = 0;
752 break;
753
754 #endif
755
756 case SSL3_ST_SW_CHANGE_A:
757 case SSL3_ST_SW_CHANGE_B:
758
759 s->session->cipher = s->s3->tmp.new_cipher;
760 if (!s->method->ssl3_enc->setup_key_block(s)) {
761 ret = -1;
762 s->state = SSL_ST_ERR;
763 goto end;
764 }
765
766 ret = dtls1_send_change_cipher_spec(s,
767 SSL3_ST_SW_CHANGE_A,
768 SSL3_ST_SW_CHANGE_B);
769
770 if (ret <= 0)
771 goto end;
772
773 #ifndef OPENSSL_NO_SCTP
774 if (!s->hit) {
775 /*
776 * Change to new shared key of SCTP-Auth, will be ignored if
777 * no SCTP used.
778 */
779 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
780 0, NULL);
781 }
782 #endif
783
784 s->state = SSL3_ST_SW_FINISHED_A;
785 s->init_num = 0;
786
787 if (!s->method->ssl3_enc->change_cipher_state(s,
788 SSL3_CHANGE_CIPHER_SERVER_WRITE))
789 {
790 ret = -1;
791 s->state = SSL_ST_ERR;
792 goto end;
793 }
794
795 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
796 break;
797
798 case SSL3_ST_SW_FINISHED_A:
799 case SSL3_ST_SW_FINISHED_B:
800 ret = dtls1_send_finished(s,
801 SSL3_ST_SW_FINISHED_A,
802 SSL3_ST_SW_FINISHED_B,
803 s->method->
804 ssl3_enc->server_finished_label,
805 s->method->
806 ssl3_enc->server_finished_label_len);
807 if (ret <= 0)
808 goto end;
809 s->state = SSL3_ST_SW_FLUSH;
810 if (s->hit) {
811 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
812
813 #ifndef OPENSSL_NO_SCTP
814 /*
815 * Change to new shared key of SCTP-Auth, will be ignored if
816 * no SCTP used.
817 */
818 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
819 0, NULL);
820 #endif
821 } else {
822 s->s3->tmp.next_state = SSL_ST_OK;
823 #ifndef OPENSSL_NO_SCTP
824 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
825 s->d1->next_state = s->s3->tmp.next_state;
826 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
827 }
828 #endif
829 }
830 s->init_num = 0;
831 break;
832
833 case SSL_ST_OK:
834 /* clean a few things up */
835 ssl3_cleanup_key_block(s);
836
837 #if 0
838 BUF_MEM_free(s->init_buf);
839 s->init_buf = NULL;
840 #endif
841
842 /* remove buffering on output */
843 ssl_free_wbio_buffer(s);
844
845 s->init_num = 0;
846
847 if (s->renegotiate == 2) { /* skipped if we just sent a
848 * HelloRequest */
849 s->renegotiate = 0;
850 s->new_session = 0;
851
852 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
853
854 s->ctx->stats.sess_accept_good++;
855 /* s->server=1; */
856 s->handshake_func = dtls1_accept;
857
858 if (cb != NULL)
859 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
860 }
861
862 ret = 1;
863
864 /* done handshaking, next message is client hello */
865 s->d1->handshake_read_seq = 0;
866 /* next message is server hello */
867 s->d1->handshake_write_seq = 0;
868 s->d1->next_handshake_write_seq = 0;
869 dtls1_clear_received_buffer(s);
870 goto end;
871 /* break; */
872
873 case SSL_ST_ERR:
874 default:
875 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
876 ret = -1;
877 goto end;
878 /* break; */
879 }
880
881 if (!s->s3->tmp.reuse_message && !skip) {
882 if (s->debug) {
883 if ((ret = BIO_flush(s->wbio)) <= 0)
884 goto end;
885 }
886
887 if ((cb != NULL) && (s->state != state)) {
888 new_state = s->state;
889 s->state = state;
890 cb(s, SSL_CB_ACCEPT_LOOP, 1);
891 s->state = new_state;
892 }
893 }
894 skip = 0;
895 }
896 end:
897 /* BIO_flush(s->wbio); */
898
899 s->in_handshake--;
900 #ifndef OPENSSL_NO_SCTP
901 /*
902 * Notify SCTP BIO socket to leave handshake mode and prevent stream
903 * identifier other than 0. Will be ignored if no SCTP is used.
904 */
905 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
906 s->in_handshake, NULL);
907 #endif
908
909 if (cb != NULL)
910 cb(s, SSL_CB_ACCEPT_EXIT, ret);
911 return (ret);
912 }
913
dtls1_send_hello_request(SSL * s)914 int dtls1_send_hello_request(SSL *s)
915 {
916 unsigned char *p;
917
918 if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
919 p = (unsigned char *)s->init_buf->data;
920 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
921
922 s->state = SSL3_ST_SW_HELLO_REQ_B;
923 /* number of bytes to write */
924 s->init_num = DTLS1_HM_HEADER_LENGTH;
925 s->init_off = 0;
926
927 /*
928 * no need to buffer this message, since there are no retransmit
929 * requests for it
930 */
931 }
932
933 /* SSL3_ST_SW_HELLO_REQ_B */
934 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
935 }
936
dtls1_send_hello_verify_request(SSL * s)937 int dtls1_send_hello_verify_request(SSL *s)
938 {
939 unsigned int msg_len;
940 unsigned char *msg, *buf, *p;
941
942 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
943 buf = (unsigned char *)s->init_buf->data;
944
945 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
946 *(p++) = s->version >> 8;
947 *(p++) = s->version & 0xFF;
948
949 if (s->ctx->app_gen_cookie_cb == NULL ||
950 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
951 &(s->d1->cookie_len)) == 0) {
952 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
953 ERR_R_INTERNAL_ERROR);
954 s->state = SSL_ST_ERR;
955 return 0;
956 }
957
958 *(p++) = (unsigned char)s->d1->cookie_len;
959 memcpy(p, s->d1->cookie, s->d1->cookie_len);
960 p += s->d1->cookie_len;
961 msg_len = p - msg;
962
963 dtls1_set_message_header(s, buf,
964 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0,
965 msg_len);
966
967 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
968 /* number of bytes to write */
969 s->init_num = p - buf;
970 s->init_off = 0;
971 }
972
973 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
974 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
975 }
976
dtls1_send_server_hello(SSL * s)977 int dtls1_send_server_hello(SSL *s)
978 {
979 unsigned char *buf;
980 unsigned char *p, *d;
981 int i;
982 unsigned int sl;
983 unsigned long l;
984
985 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
986 buf = (unsigned char *)s->init_buf->data;
987 p = s->s3->server_random;
988 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
989 /* Do the message type and length last */
990 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
991
992 *(p++) = s->version >> 8;
993 *(p++) = s->version & 0xff;
994
995 /* Random stuff */
996 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
997 p += SSL3_RANDOM_SIZE;
998
999 /*
1000 * now in theory we have 3 options to sending back the session id.
1001 * If it is a re-use, we send back the old session-id, if it is a new
1002 * session, we send back the new session-id or we send back a 0
1003 * length session-id if we want it to be single use. Currently I will
1004 * not implement the '0' length session-id 12-Jan-98 - I'll now
1005 * support the '0' length stuff.
1006 */
1007 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1008 s->session->session_id_length = 0;
1009
1010 sl = s->session->session_id_length;
1011 if (sl > sizeof s->session->session_id) {
1012 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1013 return -1;
1014 }
1015 *(p++) = sl;
1016 memcpy(p, s->session->session_id, sl);
1017 p += sl;
1018
1019 /* put the cipher */
1020 if (s->s3->tmp.new_cipher == NULL)
1021 return -1;
1022 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
1023 p += i;
1024
1025 /* put the compression method */
1026 #ifdef OPENSSL_NO_COMP
1027 *(p++) = 0;
1028 #else
1029 if (s->s3->tmp.new_compression == NULL)
1030 *(p++) = 0;
1031 else
1032 *(p++) = s->s3->tmp.new_compression->id;
1033 #endif
1034
1035 #ifndef OPENSSL_NO_TLSEXT
1036 if (ssl_prepare_serverhello_tlsext(s) <= 0) {
1037 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
1038 return -1;
1039 }
1040 if ((p =
1041 ssl_add_serverhello_tlsext(s, p,
1042 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
1043 NULL) {
1044 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1045 return -1;
1046 }
1047 #endif
1048
1049 /* do the header */
1050 l = (p - d);
1051 d = buf;
1052
1053 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1054
1055 s->state = SSL3_ST_SW_SRVR_HELLO_B;
1056 /* number of bytes to write */
1057 s->init_num = p - buf;
1058 s->init_off = 0;
1059
1060 /* buffer the message to handle re-xmits */
1061 dtls1_buffer_message(s, 0);
1062 }
1063
1064 /* SSL3_ST_SW_SRVR_HELLO_B */
1065 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1066 }
1067
dtls1_send_server_done(SSL * s)1068 int dtls1_send_server_done(SSL *s)
1069 {
1070 unsigned char *p;
1071
1072 if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
1073 p = (unsigned char *)s->init_buf->data;
1074
1075 /* do the header */
1076 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1077
1078 s->state = SSL3_ST_SW_SRVR_DONE_B;
1079 /* number of bytes to write */
1080 s->init_num = DTLS1_HM_HEADER_LENGTH;
1081 s->init_off = 0;
1082
1083 /* buffer the message to handle re-xmits */
1084 dtls1_buffer_message(s, 0);
1085 }
1086
1087 /* SSL3_ST_SW_SRVR_DONE_B */
1088 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1089 }
1090
dtls1_send_server_key_exchange(SSL * s)1091 int dtls1_send_server_key_exchange(SSL *s)
1092 {
1093 #ifndef OPENSSL_NO_RSA
1094 unsigned char *q;
1095 int j, num;
1096 RSA *rsa;
1097 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1098 unsigned int u;
1099 #endif
1100 #ifndef OPENSSL_NO_DH
1101 DH *dh = NULL, *dhp;
1102 #endif
1103 #ifndef OPENSSL_NO_ECDH
1104 EC_KEY *ecdh = NULL, *ecdhp;
1105 unsigned char *encodedPoint = NULL;
1106 int encodedlen = 0;
1107 int curve_id = 0;
1108 BN_CTX *bn_ctx = NULL;
1109 #endif
1110 EVP_PKEY *pkey;
1111 unsigned char *p, *d;
1112 int al, i;
1113 unsigned long type;
1114 int n;
1115 CERT *cert;
1116 BIGNUM *r[4];
1117 int nr[4], kn;
1118 BUF_MEM *buf;
1119 EVP_MD_CTX md_ctx;
1120
1121 EVP_MD_CTX_init(&md_ctx);
1122 if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
1123 type = s->s3->tmp.new_cipher->algorithm_mkey;
1124 cert = s->cert;
1125
1126 buf = s->init_buf;
1127
1128 r[0] = r[1] = r[2] = r[3] = NULL;
1129 n = 0;
1130 #ifndef OPENSSL_NO_RSA
1131 if (type & SSL_kRSA) {
1132 rsa = cert->rsa_tmp;
1133 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
1134 rsa = s->cert->rsa_tmp_cb(s,
1135 SSL_C_IS_EXPORT(s->s3->
1136 tmp.new_cipher),
1137 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1138 tmp.new_cipher));
1139 if (rsa == NULL) {
1140 al = SSL_AD_HANDSHAKE_FAILURE;
1141 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1142 SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1143 goto f_err;
1144 }
1145 RSA_up_ref(rsa);
1146 cert->rsa_tmp = rsa;
1147 }
1148 if (rsa == NULL) {
1149 al = SSL_AD_HANDSHAKE_FAILURE;
1150 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1151 SSL_R_MISSING_TMP_RSA_KEY);
1152 goto f_err;
1153 }
1154 r[0] = rsa->n;
1155 r[1] = rsa->e;
1156 s->s3->tmp.use_rsa_tmp = 1;
1157 } else
1158 #endif
1159 #ifndef OPENSSL_NO_DH
1160 if (type & SSL_kEDH) {
1161 dhp = cert->dh_tmp;
1162 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1163 dhp = s->cert->dh_tmp_cb(s,
1164 SSL_C_IS_EXPORT(s->s3->
1165 tmp.new_cipher),
1166 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1167 tmp.new_cipher));
1168 if (dhp == NULL) {
1169 al = SSL_AD_HANDSHAKE_FAILURE;
1170 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1171 SSL_R_MISSING_TMP_DH_KEY);
1172 goto f_err;
1173 }
1174
1175 if (s->s3->tmp.dh != NULL) {
1176 DH_free(dh);
1177 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1178 ERR_R_INTERNAL_ERROR);
1179 goto err;
1180 }
1181
1182 if ((dh = DHparams_dup(dhp)) == NULL) {
1183 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1184 goto err;
1185 }
1186
1187 s->s3->tmp.dh = dh;
1188 if ((dhp->pub_key == NULL ||
1189 dhp->priv_key == NULL ||
1190 (s->options & SSL_OP_SINGLE_DH_USE))) {
1191 if (!DH_generate_key(dh)) {
1192 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1193 ERR_R_DH_LIB);
1194 goto err;
1195 }
1196 } else {
1197 dh->pub_key = BN_dup(dhp->pub_key);
1198 dh->priv_key = BN_dup(dhp->priv_key);
1199 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
1200 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1201 ERR_R_DH_LIB);
1202 goto err;
1203 }
1204 }
1205 r[0] = dh->p;
1206 r[1] = dh->g;
1207 r[2] = dh->pub_key;
1208 } else
1209 #endif
1210 #ifndef OPENSSL_NO_ECDH
1211 if (type & SSL_kEECDH) {
1212 const EC_GROUP *group;
1213
1214 ecdhp = cert->ecdh_tmp;
1215 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) {
1216 ecdhp = s->cert->ecdh_tmp_cb(s,
1217 SSL_C_IS_EXPORT(s->s3->
1218 tmp.new_cipher),
1219 SSL_C_EXPORT_PKEYLENGTH(s->
1220 s3->tmp.new_cipher));
1221 }
1222 if (ecdhp == NULL) {
1223 al = SSL_AD_HANDSHAKE_FAILURE;
1224 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1225 SSL_R_MISSING_TMP_ECDH_KEY);
1226 goto f_err;
1227 }
1228
1229 if (s->s3->tmp.ecdh != NULL) {
1230 EC_KEY_free(s->s3->tmp.ecdh);
1231 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1232 ERR_R_INTERNAL_ERROR);
1233 goto err;
1234 }
1235
1236 /* Duplicate the ECDH structure. */
1237 if (ecdhp == NULL) {
1238 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1239 goto err;
1240 }
1241 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
1242 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1243 goto err;
1244 }
1245
1246 s->s3->tmp.ecdh = ecdh;
1247 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1248 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1249 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
1250 if (!EC_KEY_generate_key(ecdh)) {
1251 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1252 ERR_R_ECDH_LIB);
1253 goto err;
1254 }
1255 }
1256
1257 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1258 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1259 (EC_KEY_get0_private_key(ecdh) == NULL)) {
1260 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1261 goto err;
1262 }
1263
1264 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1265 (EC_GROUP_get_degree(group) > 163)) {
1266 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1267 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1268 goto err;
1269 }
1270
1271 /*
1272 * XXX: For now, we only support ephemeral ECDH keys over named
1273 * (not generic) curves. For supported named curves, curve_id is
1274 * non-zero.
1275 */
1276 if ((curve_id =
1277 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1278 == 0) {
1279 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1280 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1281 goto err;
1282 }
1283
1284 /*
1285 * Encode the public key. First check the size of encoding and
1286 * allocate memory accordingly.
1287 */
1288 encodedlen = EC_POINT_point2oct(group,
1289 EC_KEY_get0_public_key(ecdh),
1290 POINT_CONVERSION_UNCOMPRESSED,
1291 NULL, 0, NULL);
1292
1293 encodedPoint = (unsigned char *)
1294 OPENSSL_malloc(encodedlen * sizeof(unsigned char));
1295 bn_ctx = BN_CTX_new();
1296 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1297 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1298 ERR_R_MALLOC_FAILURE);
1299 goto err;
1300 }
1301
1302 encodedlen = EC_POINT_point2oct(group,
1303 EC_KEY_get0_public_key(ecdh),
1304 POINT_CONVERSION_UNCOMPRESSED,
1305 encodedPoint, encodedlen, bn_ctx);
1306
1307 if (encodedlen == 0) {
1308 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1309 goto err;
1310 }
1311
1312 BN_CTX_free(bn_ctx);
1313 bn_ctx = NULL;
1314
1315 /*
1316 * XXX: For now, we only support named (not generic) curves in
1317 * ECDH ephemeral key exchanges. In this situation, we need four
1318 * additional bytes to encode the entire ServerECDHParams
1319 * structure.
1320 */
1321 n = 4 + encodedlen;
1322
1323 /*
1324 * We'll generate the serverKeyExchange message explicitly so we
1325 * can set these to NULLs
1326 */
1327 r[0] = NULL;
1328 r[1] = NULL;
1329 r[2] = NULL;
1330 r[3] = NULL;
1331 } else
1332 #endif /* !OPENSSL_NO_ECDH */
1333 #ifndef OPENSSL_NO_PSK
1334 if (type & SSL_kPSK) {
1335 /*
1336 * reserve size for record length and PSK identity hint
1337 */
1338 n += 2 + strlen(s->ctx->psk_identity_hint);
1339 } else
1340 #endif /* !OPENSSL_NO_PSK */
1341 {
1342 al = SSL_AD_HANDSHAKE_FAILURE;
1343 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1344 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1345 goto f_err;
1346 }
1347 for (i = 0; r[i] != NULL; i++) {
1348 nr[i] = BN_num_bytes(r[i]);
1349 n += 2 + nr[i];
1350 }
1351
1352 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1353 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
1354 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, NULL))
1355 == NULL) {
1356 al = SSL_AD_DECODE_ERROR;
1357 goto f_err;
1358 }
1359 kn = EVP_PKEY_size(pkey);
1360 } else {
1361 pkey = NULL;
1362 kn = 0;
1363 }
1364
1365 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) {
1366 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
1367 goto err;
1368 }
1369 d = (unsigned char *)s->init_buf->data;
1370 p = &(d[DTLS1_HM_HEADER_LENGTH]);
1371
1372 for (i = 0; r[i] != NULL; i++) {
1373 s2n(nr[i], p);
1374 BN_bn2bin(r[i], p);
1375 p += nr[i];
1376 }
1377
1378 #ifndef OPENSSL_NO_ECDH
1379 if (type & SSL_kEECDH) {
1380 /*
1381 * XXX: For now, we only support named (not generic) curves. In
1382 * this situation, the serverKeyExchange message has: [1 byte
1383 * CurveType], [2 byte CurveName] [1 byte length of encoded
1384 * point], followed by the actual encoded point itself
1385 */
1386 *p = NAMED_CURVE_TYPE;
1387 p += 1;
1388 *p = 0;
1389 p += 1;
1390 *p = curve_id;
1391 p += 1;
1392 *p = encodedlen;
1393 p += 1;
1394 memcpy((unsigned char *)p,
1395 (unsigned char *)encodedPoint, encodedlen);
1396 OPENSSL_free(encodedPoint);
1397 encodedPoint = NULL;
1398 p += encodedlen;
1399 }
1400 #endif
1401
1402 #ifndef OPENSSL_NO_PSK
1403 if (type & SSL_kPSK) {
1404 /* copy PSK identity hint */
1405 s2n(strlen(s->ctx->psk_identity_hint), p);
1406 strncpy((char *)p, s->ctx->psk_identity_hint,
1407 strlen(s->ctx->psk_identity_hint));
1408 p += strlen(s->ctx->psk_identity_hint);
1409 }
1410 #endif
1411
1412 /* not anonymous */
1413 if (pkey != NULL) {
1414 /*
1415 * n is the length of the params, they start at
1416 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the
1417 * end.
1418 */
1419 #ifndef OPENSSL_NO_RSA
1420 if (pkey->type == EVP_PKEY_RSA) {
1421 q = md_buf;
1422 j = 0;
1423 for (num = 2; num > 0; num--) {
1424 EVP_DigestInit_ex(&md_ctx, (num == 2)
1425 ? s->ctx->md5 : s->ctx->sha1, NULL);
1426 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1427 SSL3_RANDOM_SIZE);
1428 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1429 SSL3_RANDOM_SIZE);
1430 EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]),
1431 n);
1432 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
1433 q += i;
1434 j += i;
1435 }
1436 if (RSA_sign(NID_md5_sha1, md_buf, j,
1437 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1438 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
1439 goto err;
1440 }
1441 s2n(u, p);
1442 n += u + 2;
1443 } else
1444 #endif
1445 #if !defined(OPENSSL_NO_DSA)
1446 if (pkey->type == EVP_PKEY_DSA) {
1447 /* lets do DSS */
1448 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL);
1449 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1450 SSL3_RANDOM_SIZE);
1451 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1452 SSL3_RANDOM_SIZE);
1453 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1454 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1455 (unsigned int *)&i, pkey)) {
1456 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA);
1457 goto err;
1458 }
1459 s2n(i, p);
1460 n += i + 2;
1461 } else
1462 #endif
1463 #if !defined(OPENSSL_NO_ECDSA)
1464 if (pkey->type == EVP_PKEY_EC) {
1465 /* let's do ECDSA */
1466 EVP_SignInit_ex(&md_ctx, EVP_ecdsa(), NULL);
1467 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
1468 SSL3_RANDOM_SIZE);
1469 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
1470 SSL3_RANDOM_SIZE);
1471 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n);
1472 if (!EVP_SignFinal(&md_ctx, &(p[2]),
1473 (unsigned int *)&i, pkey)) {
1474 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1475 ERR_LIB_ECDSA);
1476 goto err;
1477 }
1478 s2n(i, p);
1479 n += i + 2;
1480 } else
1481 #endif
1482 {
1483 /* Is this error check actually needed? */
1484 al = SSL_AD_HANDSHAKE_FAILURE;
1485 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1486 SSL_R_UNKNOWN_PKEY_TYPE);
1487 goto f_err;
1488 }
1489 }
1490
1491 d = dtls1_set_message_header(s, d,
1492 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1493
1494 /*
1495 * we should now have things packed up, so lets send it off
1496 */
1497 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1498 s->init_off = 0;
1499
1500 /* buffer the message to handle re-xmits */
1501 dtls1_buffer_message(s, 0);
1502 }
1503
1504 s->state = SSL3_ST_SW_KEY_EXCH_B;
1505 EVP_MD_CTX_cleanup(&md_ctx);
1506 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1507 f_err:
1508 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1509 err:
1510 #ifndef OPENSSL_NO_ECDH
1511 if (encodedPoint != NULL)
1512 OPENSSL_free(encodedPoint);
1513 BN_CTX_free(bn_ctx);
1514 #endif
1515 EVP_MD_CTX_cleanup(&md_ctx);
1516 return (-1);
1517 }
1518
dtls1_send_certificate_request(SSL * s)1519 int dtls1_send_certificate_request(SSL *s)
1520 {
1521 unsigned char *p, *d;
1522 int i, j, nl, off, n;
1523 STACK_OF(X509_NAME) *sk = NULL;
1524 X509_NAME *name;
1525 BUF_MEM *buf;
1526 unsigned int msg_len;
1527
1528 if (s->state == SSL3_ST_SW_CERT_REQ_A) {
1529 buf = s->init_buf;
1530
1531 d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1532
1533 /* get the list of acceptable cert types */
1534 p++;
1535 n = ssl3_get_req_cert_type(s, p);
1536 d[0] = n;
1537 p += n;
1538 n++;
1539
1540 off = n;
1541 p += 2;
1542 n += 2;
1543
1544 sk = SSL_get_client_CA_list(s);
1545 nl = 0;
1546 if (sk != NULL) {
1547 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
1548 name = sk_X509_NAME_value(sk, i);
1549 j = i2d_X509_NAME(name, NULL);
1550 if (!BUF_MEM_grow_clean
1551 (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) {
1552 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,
1553 ERR_R_BUF_LIB);
1554 goto err;
1555 }
1556 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]);
1557 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) {
1558 s2n(j, p);
1559 i2d_X509_NAME(name, &p);
1560 n += 2 + j;
1561 nl += 2 + j;
1562 } else {
1563 d = p;
1564 i2d_X509_NAME(name, &p);
1565 j -= 2;
1566 s2n(j, d);
1567 j += 2;
1568 n += j;
1569 nl += j;
1570 }
1571 }
1572 }
1573 /* else no CA names */
1574 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]);
1575 s2n(nl, p);
1576
1577 d = (unsigned char *)buf->data;
1578 *(d++) = SSL3_MT_CERTIFICATE_REQUEST;
1579 l2n3(n, d);
1580 s2n(s->d1->handshake_write_seq, d);
1581 s->d1->handshake_write_seq++;
1582
1583 /*
1584 * we should now have things packed up, so lets send it off
1585 */
1586
1587 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1588 s->init_off = 0;
1589 #ifdef NETSCAPE_HANG_BUG
1590 /* XXX: what to do about this? */
1591 p = (unsigned char *)s->init_buf->data + s->init_num;
1592
1593 /* do the header */
1594 *(p++) = SSL3_MT_SERVER_DONE;
1595 *(p++) = 0;
1596 *(p++) = 0;
1597 *(p++) = 0;
1598 s->init_num += 4;
1599 #endif
1600
1601 /* XDTLS: set message header ? */
1602 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1603 dtls1_set_message_header(s, (void *)s->init_buf->data,
1604 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0,
1605 msg_len);
1606
1607 /* buffer the message to handle re-xmits */
1608 dtls1_buffer_message(s, 0);
1609
1610 s->state = SSL3_ST_SW_CERT_REQ_B;
1611 }
1612
1613 /* SSL3_ST_SW_CERT_REQ_B */
1614 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1615 err:
1616 return (-1);
1617 }
1618
dtls1_send_server_certificate(SSL * s)1619 int dtls1_send_server_certificate(SSL *s)
1620 {
1621 unsigned long l;
1622 X509 *x;
1623
1624 if (s->state == SSL3_ST_SW_CERT_A) {
1625 x = ssl_get_server_send_cert(s);
1626 if (x == NULL) {
1627 /* VRS: allow null cert if auth == KRB5 */
1628 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1629 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) {
1630 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,
1631 ERR_R_INTERNAL_ERROR);
1632 return (0);
1633 }
1634 }
1635
1636 l = dtls1_output_cert_chain(s, x);
1637 if (!l) {
1638 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1639 return (0);
1640 }
1641 s->state = SSL3_ST_SW_CERT_B;
1642 s->init_num = (int)l;
1643 s->init_off = 0;
1644
1645 /* buffer the message to handle re-xmits */
1646 dtls1_buffer_message(s, 0);
1647 }
1648
1649 /* SSL3_ST_SW_CERT_B */
1650 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1651 }
1652
1653 #ifndef OPENSSL_NO_TLSEXT
dtls1_send_newsession_ticket(SSL * s)1654 int dtls1_send_newsession_ticket(SSL *s)
1655 {
1656 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
1657 unsigned char *p, *senc, *macstart;
1658 int len, slen;
1659 unsigned int hlen, msg_len;
1660 EVP_CIPHER_CTX ctx;
1661 HMAC_CTX hctx;
1662 SSL_CTX *tctx = s->initial_ctx;
1663 unsigned char iv[EVP_MAX_IV_LENGTH];
1664 unsigned char key_name[16];
1665
1666 /* get session encoding length */
1667 slen = i2d_SSL_SESSION(s->session, NULL);
1668 /*
1669 * Some length values are 16 bits, so forget it if session is too
1670 * long
1671 */
1672 if (slen > 0xFF00)
1673 return -1;
1674 /*
1675 * Grow buffer if need be: the length calculation is as follows 12
1676 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2
1677 * (ticket length) + 16 (key name) + max_iv_len (iv length) +
1678 * session_length + max_enc_block_size (max encrypted session length)
1679 * + max_md_size (HMAC).
1680 */
1681 if (!BUF_MEM_grow(s->init_buf,
1682 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1683 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1684 return -1;
1685 senc = OPENSSL_malloc(slen);
1686 if (!senc)
1687 return -1;
1688 p = senc;
1689 i2d_SSL_SESSION(s->session, &p);
1690
1691 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1692 EVP_CIPHER_CTX_init(&ctx);
1693 HMAC_CTX_init(&hctx);
1694 /*
1695 * Initialize HMAC and cipher contexts. If callback present it does
1696 * all the work otherwise use generated values from parent ctx.
1697 */
1698 if (tctx->tlsext_ticket_key_cb) {
1699 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1700 &hctx, 1) < 0) {
1701 OPENSSL_free(senc);
1702 return -1;
1703 }
1704 } else {
1705 if (RAND_bytes(iv, 16) <= 0) {
1706 OPENSSL_free(senc);
1707 return -1;
1708 }
1709 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1710 tctx->tlsext_tick_aes_key, iv);
1711 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1712 tlsext_tick_md(), NULL);
1713 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1714 }
1715 l2n(s->session->tlsext_tick_lifetime_hint, p);
1716 /* Skip ticket length for now */
1717 p += 2;
1718 /* Output key name */
1719 macstart = p;
1720 memcpy(p, key_name, 16);
1721 p += 16;
1722 /* output IV */
1723 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1724 p += EVP_CIPHER_CTX_iv_length(&ctx);
1725 /* Encrypt session data */
1726 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1727 p += len;
1728 EVP_EncryptFinal(&ctx, p, &len);
1729 p += len;
1730 EVP_CIPHER_CTX_cleanup(&ctx);
1731
1732 HMAC_Update(&hctx, macstart, p - macstart);
1733 HMAC_Final(&hctx, p, &hlen);
1734 HMAC_CTX_cleanup(&hctx);
1735
1736 p += hlen;
1737 /* Now write out lengths: p points to end of data written */
1738 /* Total length */
1739 len = p - (unsigned char *)(s->init_buf->data);
1740 /* Ticket length */
1741 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1742 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1743
1744 /* number of bytes to write */
1745 s->init_num = len;
1746 s->state = SSL3_ST_SW_SESSION_TICKET_B;
1747 s->init_off = 0;
1748 OPENSSL_free(senc);
1749
1750 /* XDTLS: set message header ? */
1751 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1752 dtls1_set_message_header(s, (void *)s->init_buf->data,
1753 SSL3_MT_NEWSESSION_TICKET, msg_len, 0,
1754 msg_len);
1755
1756 /* buffer the message to handle re-xmits */
1757 dtls1_buffer_message(s, 0);
1758 }
1759
1760 /* SSL3_ST_SW_SESSION_TICKET_B */
1761 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1762 }
1763 #endif
1764