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,
143 dtls1_get_server_method)
144
145 int dtls1_accept(SSL *s)
146 {
147 BUF_MEM *buf;
148 unsigned long Time=(unsigned long)time(NULL);
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
150 unsigned long alg_k;
151 int ret= -1;
152 int new_state,state,skip=0;
153 int listen;
154
155 RAND_add(&Time,sizeof(Time),0);
156 ERR_clear_error();
157 clear_sys_error();
158
159 if (s->info_callback != NULL)
160 cb=s->info_callback;
161 else if (s->ctx->info_callback != NULL)
162 cb=s->ctx->info_callback;
163
164 listen = s->d1->listen;
165
166 /* init things to blank */
167 s->in_handshake++;
168 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
169
170 s->d1->listen = listen;
171
172 if (s->cert == NULL)
173 {
174 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
175 return(-1);
176 }
177
178 for (;;)
179 {
180 state=s->state;
181
182 switch (s->state)
183 {
184 case SSL_ST_RENEGOTIATE:
185 s->new_session=1;
186 /* s->state=SSL_ST_ACCEPT; */
187
188 case SSL_ST_BEFORE:
189 case SSL_ST_ACCEPT:
190 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
191 case SSL_ST_OK|SSL_ST_ACCEPT:
192
193 s->server=1;
194 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
195
196 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
197 {
198 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
199 return -1;
200 }
201 s->type=SSL_ST_ACCEPT;
202
203 if (s->init_buf == NULL)
204 {
205 if ((buf=BUF_MEM_new()) == NULL)
206 {
207 ret= -1;
208 goto end;
209 }
210 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
211 {
212 ret= -1;
213 goto end;
214 }
215 s->init_buf=buf;
216 }
217
218 if (!ssl3_setup_buffers(s))
219 {
220 ret= -1;
221 goto end;
222 }
223
224 s->init_num=0;
225
226 if (s->state != SSL_ST_RENEGOTIATE)
227 {
228 /* Ok, we now need to push on a buffering BIO so that
229 * the output is sent in a way that TCP likes :-)
230 */
231 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
232
233 ssl3_init_finished_mac(s);
234 s->state=SSL3_ST_SR_CLNT_HELLO_A;
235 s->ctx->stats.sess_accept++;
236 }
237 else
238 {
239 /* s->state == SSL_ST_RENEGOTIATE,
240 * we will just send a HelloRequest */
241 s->ctx->stats.sess_accept_renegotiate++;
242 s->state=SSL3_ST_SW_HELLO_REQ_A;
243 }
244
245 break;
246
247 case SSL3_ST_SW_HELLO_REQ_A:
248 case SSL3_ST_SW_HELLO_REQ_B:
249
250 s->shutdown=0;
251 dtls1_start_timer(s);
252 ret=dtls1_send_hello_request(s);
253 if (ret <= 0) goto end;
254 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
255 s->state=SSL3_ST_SW_FLUSH;
256 s->init_num=0;
257
258 ssl3_init_finished_mac(s);
259 break;
260
261 case SSL3_ST_SW_HELLO_REQ_C:
262 s->state=SSL_ST_OK;
263 break;
264
265 case SSL3_ST_SR_CLNT_HELLO_A:
266 case SSL3_ST_SR_CLNT_HELLO_B:
267 case SSL3_ST_SR_CLNT_HELLO_C:
268
269 s->shutdown=0;
270 ret=ssl3_get_client_hello(s);
271 if (ret <= 0) goto end;
272 dtls1_stop_timer(s);
273
274 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
275 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
276 else
277 s->state = SSL3_ST_SW_SRVR_HELLO_A;
278
279 s->init_num=0;
280
281 /* Reflect ClientHello sequence to remain stateless while listening */
282 if (listen)
283 {
284 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
285 }
286
287 /* If we're just listening, stop here */
288 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
289 {
290 ret = 2;
291 s->d1->listen = 0;
292 /* Set expected sequence numbers
293 * to continue the handshake.
294 */
295 s->d1->handshake_read_seq = 2;
296 s->d1->handshake_write_seq = 1;
297 s->d1->next_handshake_write_seq = 1;
298 goto end;
299 }
300
301 break;
302
303 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
304 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
305
306 ret = dtls1_send_hello_verify_request(s);
307 if ( ret <= 0) goto end;
308 s->state=SSL3_ST_SW_FLUSH;
309 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
310
311 /* HelloVerifyRequest resets Finished MAC */
312 if (s->version != DTLS1_BAD_VER)
313 ssl3_init_finished_mac(s);
314 break;
315
316 case SSL3_ST_SW_SRVR_HELLO_A:
317 case SSL3_ST_SW_SRVR_HELLO_B:
318 s->new_session = 2;
319 dtls1_start_timer(s);
320 ret=dtls1_send_server_hello(s);
321 if (ret <= 0) goto end;
322
323 #ifndef OPENSSL_NO_TLSEXT
324 if (s->hit)
325 {
326 if (s->tlsext_ticket_expected)
327 s->state=SSL3_ST_SW_SESSION_TICKET_A;
328 else
329 s->state=SSL3_ST_SW_CHANGE_A;
330 }
331 #else
332 if (s->hit)
333 s->state=SSL3_ST_SW_CHANGE_A;
334 #endif
335 else
336 s->state=SSL3_ST_SW_CERT_A;
337 s->init_num=0;
338 break;
339
340 case SSL3_ST_SW_CERT_A:
341 case SSL3_ST_SW_CERT_B:
342 /* Check if it is anon DH or normal PSK */
343 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
344 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
345 {
346 dtls1_start_timer(s);
347 ret=dtls1_send_server_certificate(s);
348 if (ret <= 0) goto end;
349 #ifndef OPENSSL_NO_TLSEXT
350 if (s->tlsext_status_expected)
351 s->state=SSL3_ST_SW_CERT_STATUS_A;
352 else
353 s->state=SSL3_ST_SW_KEY_EXCH_A;
354 }
355 else
356 {
357 skip = 1;
358 s->state=SSL3_ST_SW_KEY_EXCH_A;
359 }
360 #else
361 }
362 else
363 skip=1;
364
365 s->state=SSL3_ST_SW_KEY_EXCH_A;
366 #endif
367 s->init_num=0;
368 break;
369
370 case SSL3_ST_SW_KEY_EXCH_A:
371 case SSL3_ST_SW_KEY_EXCH_B:
372 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
373
374 /* clear this, it may get reset by
375 * send_server_key_exchange */
376 if ((s->options & SSL_OP_EPHEMERAL_RSA)
377 #ifndef OPENSSL_NO_KRB5
378 && !(alg_k & SSL_kKRB5)
379 #endif /* OPENSSL_NO_KRB5 */
380 )
381 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
382 * even when forbidden by protocol specs
383 * (handshake may fail as clients are not required to
384 * be able to handle this) */
385 s->s3->tmp.use_rsa_tmp=1;
386 else
387 s->s3->tmp.use_rsa_tmp=0;
388
389 /* only send if a DH key exchange or
390 * RSA but we have a sign only certificate */
391 if (s->s3->tmp.use_rsa_tmp
392 /* PSK: send ServerKeyExchange if PSK identity
393 * hint if provided */
394 #ifndef OPENSSL_NO_PSK
395 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
396 #endif
397 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
398 || (alg_k & SSL_kEECDH)
399 || ((alg_k & SSL_kRSA)
400 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
401 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
402 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
403 )
404 )
405 )
406 )
407 {
408 dtls1_start_timer(s);
409 ret=dtls1_send_server_key_exchange(s);
410 if (ret <= 0) goto end;
411 }
412 else
413 skip=1;
414
415 s->state=SSL3_ST_SW_CERT_REQ_A;
416 s->init_num=0;
417 break;
418
419 case SSL3_ST_SW_CERT_REQ_A:
420 case SSL3_ST_SW_CERT_REQ_B:
421 if (/* don't request cert unless asked for it: */
422 !(s->verify_mode & SSL_VERIFY_PEER) ||
423 /* if SSL_VERIFY_CLIENT_ONCE is set,
424 * don't request cert during re-negotiation: */
425 ((s->session->peer != NULL) &&
426 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
427 /* never request cert in anonymous ciphersuites
428 * (see section "Certificate request" in SSL 3 drafts
429 * and in RFC 2246): */
430 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
431 /* ... except when the application insists on verification
432 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
433 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
434 /* never request cert in Kerberos ciphersuites */
435 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
436 /* With normal PSK Certificates and
437 * Certificate Requests are omitted */
438 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
439 {
440 /* no cert request */
441 skip=1;
442 s->s3->tmp.cert_request=0;
443 s->state=SSL3_ST_SW_SRVR_DONE_A;
444 }
445 else
446 {
447 s->s3->tmp.cert_request=1;
448 dtls1_start_timer(s);
449 ret=dtls1_send_certificate_request(s);
450 if (ret <= 0) goto end;
451 #ifndef NETSCAPE_HANG_BUG
452 s->state=SSL3_ST_SW_SRVR_DONE_A;
453 #else
454 s->state=SSL3_ST_SW_FLUSH;
455 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
456 #endif
457 s->init_num=0;
458 }
459 break;
460
461 case SSL3_ST_SW_SRVR_DONE_A:
462 case SSL3_ST_SW_SRVR_DONE_B:
463 dtls1_start_timer(s);
464 ret=dtls1_send_server_done(s);
465 if (ret <= 0) goto end;
466 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
467 s->state=SSL3_ST_SW_FLUSH;
468 s->init_num=0;
469 break;
470
471 case SSL3_ST_SW_FLUSH:
472 s->rwstate=SSL_WRITING;
473 if (BIO_flush(s->wbio) <= 0)
474 {
475 ret= -1;
476 goto end;
477 }
478 s->rwstate=SSL_NOTHING;
479 s->state=s->s3->tmp.next_state;
480 break;
481
482 case SSL3_ST_SR_CERT_A:
483 case SSL3_ST_SR_CERT_B:
484 /* Check for second client hello (MS SGC) */
485 ret = ssl3_check_client_hello(s);
486 if (ret <= 0)
487 goto end;
488 dtls1_stop_timer(s);
489 if (ret == 2)
490 s->state = SSL3_ST_SR_CLNT_HELLO_C;
491 else {
492 /* could be sent for a DH cert, even if we
493 * have not asked for it :-) */
494 ret=ssl3_get_client_certificate(s);
495 if (ret <= 0) goto end;
496 dtls1_stop_timer(s);
497 s->init_num=0;
498 s->state=SSL3_ST_SR_KEY_EXCH_A;
499 }
500 break;
501
502 case SSL3_ST_SR_KEY_EXCH_A:
503 case SSL3_ST_SR_KEY_EXCH_B:
504 ret=ssl3_get_client_key_exchange(s);
505 if (ret <= 0) goto end;
506 dtls1_stop_timer(s);
507 s->state=SSL3_ST_SR_CERT_VRFY_A;
508 s->init_num=0;
509
510 if (ret == 2)
511 {
512 /* For the ECDH ciphersuites when
513 * the client sends its ECDH pub key in
514 * a certificate, the CertificateVerify
515 * message is not sent.
516 */
517 s->state=SSL3_ST_SR_FINISHED_A;
518 s->init_num = 0;
519 }
520 else
521 {
522 s->state=SSL3_ST_SR_CERT_VRFY_A;
523 s->init_num=0;
524
525 /* We need to get hashes here so if there is
526 * a client cert, it can be verified */
527 s->method->ssl3_enc->cert_verify_mac(s,
528 NID_md5,
529 &(s->s3->tmp.cert_verify_md[0]));
530 s->method->ssl3_enc->cert_verify_mac(s,
531 NID_sha1,
532 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
533 }
534 break;
535
536 case SSL3_ST_SR_CERT_VRFY_A:
537 case SSL3_ST_SR_CERT_VRFY_B:
538
539 s->d1->change_cipher_spec_ok = 1;
540 /* we should decide if we expected this one */
541 ret=ssl3_get_cert_verify(s);
542 if (ret <= 0) goto end;
543 dtls1_stop_timer(s);
544
545 s->state=SSL3_ST_SR_FINISHED_A;
546 s->init_num=0;
547 break;
548
549 case SSL3_ST_SR_FINISHED_A:
550 case SSL3_ST_SR_FINISHED_B:
551 s->d1->change_cipher_spec_ok = 1;
552 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
553 SSL3_ST_SR_FINISHED_B);
554 if (ret <= 0) goto end;
555 dtls1_stop_timer(s);
556 if (s->hit)
557 s->state=SSL_ST_OK;
558 #ifndef OPENSSL_NO_TLSEXT
559 else if (s->tlsext_ticket_expected)
560 s->state=SSL3_ST_SW_SESSION_TICKET_A;
561 #endif
562 else
563 s->state=SSL3_ST_SW_CHANGE_A;
564 s->init_num=0;
565 break;
566
567 #ifndef OPENSSL_NO_TLSEXT
568 case SSL3_ST_SW_SESSION_TICKET_A:
569 case SSL3_ST_SW_SESSION_TICKET_B:
570 ret=dtls1_send_newsession_ticket(s);
571 if (ret <= 0) goto end;
572 s->state=SSL3_ST_SW_CHANGE_A;
573 s->init_num=0;
574 break;
575
576 case SSL3_ST_SW_CERT_STATUS_A:
577 case SSL3_ST_SW_CERT_STATUS_B:
578 ret=ssl3_send_cert_status(s);
579 if (ret <= 0) goto end;
580 s->state=SSL3_ST_SW_KEY_EXCH_A;
581 s->init_num=0;
582 break;
583
584 #endif
585
586 case SSL3_ST_SW_CHANGE_A:
587 case SSL3_ST_SW_CHANGE_B:
588
589 s->session->cipher=s->s3->tmp.new_cipher;
590 if (!s->method->ssl3_enc->setup_key_block(s))
591 { ret= -1; goto end; }
592
593 ret=dtls1_send_change_cipher_spec(s,
594 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
595
596 if (ret <= 0) goto end;
597 s->state=SSL3_ST_SW_FINISHED_A;
598 s->init_num=0;
599
600 if (!s->method->ssl3_enc->change_cipher_state(s,
601 SSL3_CHANGE_CIPHER_SERVER_WRITE))
602 {
603 ret= -1;
604 goto end;
605 }
606
607 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
608 break;
609
610 case SSL3_ST_SW_FINISHED_A:
611 case SSL3_ST_SW_FINISHED_B:
612 ret=dtls1_send_finished(s,
613 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
614 s->method->ssl3_enc->server_finished_label,
615 s->method->ssl3_enc->server_finished_label_len);
616 if (ret <= 0) goto end;
617 s->state=SSL3_ST_SW_FLUSH;
618 if (s->hit)
619 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
620 else
621 s->s3->tmp.next_state=SSL_ST_OK;
622 s->init_num=0;
623 break;
624
625 case SSL_ST_OK:
626 /* clean a few things up */
627 ssl3_cleanup_key_block(s);
628
629 #if 0
630 BUF_MEM_free(s->init_buf);
631 s->init_buf=NULL;
632 #endif
633
634 /* remove buffering on output */
635 ssl_free_wbio_buffer(s);
636
637 s->init_num=0;
638
639 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
640 {
641 /* actually not necessarily a 'new' session unless
642 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
643
644 s->new_session=0;
645
646 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
647
648 s->ctx->stats.sess_accept_good++;
649 /* s->server=1; */
650 s->handshake_func=dtls1_accept;
651
652 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
653 }
654
655 ret = 1;
656
657 /* done handshaking, next message is client hello */
658 s->d1->handshake_read_seq = 0;
659 /* next message is server hello */
660 s->d1->handshake_write_seq = 0;
661 s->d1->next_handshake_write_seq = 0;
662 goto end;
663 /* break; */
664
665 default:
666 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
667 ret= -1;
668 goto end;
669 /* break; */
670 }
671
672 if (!s->s3->tmp.reuse_message && !skip)
673 {
674 if (s->debug)
675 {
676 if ((ret=BIO_flush(s->wbio)) <= 0)
677 goto end;
678 }
679
680
681 if ((cb != NULL) && (s->state != state))
682 {
683 new_state=s->state;
684 s->state=state;
685 cb(s,SSL_CB_ACCEPT_LOOP,1);
686 s->state=new_state;
687 }
688 }
689 skip=0;
690 }
691 end:
692 /* BIO_flush(s->wbio); */
693
694 s->in_handshake--;
695 if (cb != NULL)
696 cb(s,SSL_CB_ACCEPT_EXIT,ret);
697 return(ret);
698 }
699
dtls1_send_hello_request(SSL * s)700 int dtls1_send_hello_request(SSL *s)
701 {
702 unsigned char *p;
703
704 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
705 {
706 p=(unsigned char *)s->init_buf->data;
707 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
708
709 s->state=SSL3_ST_SW_HELLO_REQ_B;
710 /* number of bytes to write */
711 s->init_num=DTLS1_HM_HEADER_LENGTH;
712 s->init_off=0;
713
714 /* no need to buffer this message, since there are no retransmit
715 * requests for it */
716 }
717
718 /* SSL3_ST_SW_HELLO_REQ_B */
719 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
720 }
721
dtls1_send_hello_verify_request(SSL * s)722 int dtls1_send_hello_verify_request(SSL *s)
723 {
724 unsigned int msg_len;
725 unsigned char *msg, *buf, *p;
726
727 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
728 {
729 buf = (unsigned char *)s->init_buf->data;
730
731 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
732 *(p++) = s->version >> 8;
733 *(p++) = s->version & 0xFF;
734
735 if (s->ctx->app_gen_cookie_cb == NULL ||
736 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
737 &(s->d1->cookie_len)) == 0)
738 {
739 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
740 return 0;
741 }
742
743 *(p++) = (unsigned char) s->d1->cookie_len;
744 memcpy(p, s->d1->cookie, s->d1->cookie_len);
745 p += s->d1->cookie_len;
746 msg_len = p - msg;
747
748 dtls1_set_message_header(s, buf,
749 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
750
751 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
752 /* number of bytes to write */
753 s->init_num=p-buf;
754 s->init_off=0;
755 }
756
757 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
758 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
759 }
760
dtls1_send_server_hello(SSL * s)761 int dtls1_send_server_hello(SSL *s)
762 {
763 unsigned char *buf;
764 unsigned char *p,*d;
765 int i;
766 unsigned int sl;
767 unsigned long l,Time;
768
769 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
770 {
771 buf=(unsigned char *)s->init_buf->data;
772 p=s->s3->server_random;
773 Time=(unsigned long)time(NULL); /* Time */
774 l2n(Time,p);
775 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
776 /* Do the message type and length last */
777 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
778
779 *(p++)=s->version>>8;
780 *(p++)=s->version&0xff;
781
782 /* Random stuff */
783 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
784 p+=SSL3_RANDOM_SIZE;
785
786 /* now in theory we have 3 options to sending back the
787 * session id. If it is a re-use, we send back the
788 * old session-id, if it is a new session, we send
789 * back the new session-id or we send back a 0 length
790 * session-id if we want it to be single use.
791 * Currently I will not implement the '0' length session-id
792 * 12-Jan-98 - I'll now support the '0' length stuff.
793 */
794 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
795 s->session->session_id_length=0;
796
797 sl=s->session->session_id_length;
798 if (sl > sizeof s->session->session_id)
799 {
800 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
801 return -1;
802 }
803 *(p++)=sl;
804 memcpy(p,s->session->session_id,sl);
805 p+=sl;
806
807 /* put the cipher */
808 if (s->s3->tmp.new_cipher == NULL)
809 return -1;
810 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
811 p+=i;
812
813 /* put the compression method */
814 #ifdef OPENSSL_NO_COMP
815 *(p++)=0;
816 #else
817 if (s->s3->tmp.new_compression == NULL)
818 *(p++)=0;
819 else
820 *(p++)=s->s3->tmp.new_compression->id;
821 #endif
822
823 #ifndef OPENSSL_NO_TLSEXT
824 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
825 {
826 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
827 return -1;
828 }
829 #endif
830
831 /* do the header */
832 l=(p-d);
833 d=buf;
834
835 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
836
837 s->state=SSL3_ST_SW_SRVR_HELLO_B;
838 /* number of bytes to write */
839 s->init_num=p-buf;
840 s->init_off=0;
841
842 /* buffer the message to handle re-xmits */
843 dtls1_buffer_message(s, 0);
844 }
845
846 /* SSL3_ST_SW_SRVR_HELLO_B */
847 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
848 }
849
dtls1_send_server_done(SSL * s)850 int dtls1_send_server_done(SSL *s)
851 {
852 unsigned char *p;
853
854 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
855 {
856 p=(unsigned char *)s->init_buf->data;
857
858 /* do the header */
859 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
860
861 s->state=SSL3_ST_SW_SRVR_DONE_B;
862 /* number of bytes to write */
863 s->init_num=DTLS1_HM_HEADER_LENGTH;
864 s->init_off=0;
865
866 /* buffer the message to handle re-xmits */
867 dtls1_buffer_message(s, 0);
868 }
869
870 /* SSL3_ST_SW_SRVR_DONE_B */
871 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
872 }
873
dtls1_send_server_key_exchange(SSL * s)874 int dtls1_send_server_key_exchange(SSL *s)
875 {
876 #ifndef OPENSSL_NO_RSA
877 unsigned char *q;
878 int j,num;
879 RSA *rsa;
880 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
881 unsigned int u;
882 #endif
883 #ifndef OPENSSL_NO_DH
884 DH *dh=NULL,*dhp;
885 #endif
886 #ifndef OPENSSL_NO_ECDH
887 EC_KEY *ecdh=NULL, *ecdhp;
888 unsigned char *encodedPoint = NULL;
889 int encodedlen = 0;
890 int curve_id = 0;
891 BN_CTX *bn_ctx = NULL;
892 #endif
893 EVP_PKEY *pkey;
894 unsigned char *p,*d;
895 int al,i;
896 unsigned long type;
897 int n;
898 CERT *cert;
899 BIGNUM *r[4];
900 int nr[4],kn;
901 BUF_MEM *buf;
902 EVP_MD_CTX md_ctx;
903
904 EVP_MD_CTX_init(&md_ctx);
905 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
906 {
907 type=s->s3->tmp.new_cipher->algorithm_mkey;
908 cert=s->cert;
909
910 buf=s->init_buf;
911
912 r[0]=r[1]=r[2]=r[3]=NULL;
913 n=0;
914 #ifndef OPENSSL_NO_RSA
915 if (type & SSL_kRSA)
916 {
917 rsa=cert->rsa_tmp;
918 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
919 {
920 rsa=s->cert->rsa_tmp_cb(s,
921 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
922 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
923 if(rsa == NULL)
924 {
925 al=SSL_AD_HANDSHAKE_FAILURE;
926 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
927 goto f_err;
928 }
929 RSA_up_ref(rsa);
930 cert->rsa_tmp=rsa;
931 }
932 if (rsa == NULL)
933 {
934 al=SSL_AD_HANDSHAKE_FAILURE;
935 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
936 goto f_err;
937 }
938 r[0]=rsa->n;
939 r[1]=rsa->e;
940 s->s3->tmp.use_rsa_tmp=1;
941 }
942 else
943 #endif
944 #ifndef OPENSSL_NO_DH
945 if (type & SSL_kEDH)
946 {
947 dhp=cert->dh_tmp;
948 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
949 dhp=s->cert->dh_tmp_cb(s,
950 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
951 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
952 if (dhp == NULL)
953 {
954 al=SSL_AD_HANDSHAKE_FAILURE;
955 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
956 goto f_err;
957 }
958
959 if (s->s3->tmp.dh != NULL)
960 {
961 DH_free(dh);
962 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
963 goto err;
964 }
965
966 if ((dh=DHparams_dup(dhp)) == NULL)
967 {
968 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
969 goto err;
970 }
971
972 s->s3->tmp.dh=dh;
973 if ((dhp->pub_key == NULL ||
974 dhp->priv_key == NULL ||
975 (s->options & SSL_OP_SINGLE_DH_USE)))
976 {
977 if(!DH_generate_key(dh))
978 {
979 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
980 ERR_R_DH_LIB);
981 goto err;
982 }
983 }
984 else
985 {
986 dh->pub_key=BN_dup(dhp->pub_key);
987 dh->priv_key=BN_dup(dhp->priv_key);
988 if ((dh->pub_key == NULL) ||
989 (dh->priv_key == NULL))
990 {
991 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
992 goto err;
993 }
994 }
995 r[0]=dh->p;
996 r[1]=dh->g;
997 r[2]=dh->pub_key;
998 }
999 else
1000 #endif
1001 #ifndef OPENSSL_NO_ECDH
1002 if (type & SSL_kEECDH)
1003 {
1004 const EC_GROUP *group;
1005
1006 ecdhp=cert->ecdh_tmp;
1007 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1008 {
1009 ecdhp=s->cert->ecdh_tmp_cb(s,
1010 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1011 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1012 }
1013 if (ecdhp == NULL)
1014 {
1015 al=SSL_AD_HANDSHAKE_FAILURE;
1016 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1017 goto f_err;
1018 }
1019
1020 if (s->s3->tmp.ecdh != NULL)
1021 {
1022 EC_KEY_free(s->s3->tmp.ecdh);
1023 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1024 goto err;
1025 }
1026
1027 /* Duplicate the ECDH structure. */
1028 if (ecdhp == NULL)
1029 {
1030 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1031 goto err;
1032 }
1033 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1034 {
1035 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1036 goto err;
1037 }
1038
1039 s->s3->tmp.ecdh=ecdh;
1040 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1041 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1042 (s->options & SSL_OP_SINGLE_ECDH_USE))
1043 {
1044 if(!EC_KEY_generate_key(ecdh))
1045 {
1046 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1047 goto err;
1048 }
1049 }
1050
1051 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1052 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1053 (EC_KEY_get0_private_key(ecdh) == NULL))
1054 {
1055 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1056 goto err;
1057 }
1058
1059 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1060 (EC_GROUP_get_degree(group) > 163))
1061 {
1062 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1063 goto err;
1064 }
1065
1066 /* XXX: For now, we only support ephemeral ECDH
1067 * keys over named (not generic) curves. For
1068 * supported named curves, curve_id is non-zero.
1069 */
1070 if ((curve_id =
1071 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1072 == 0)
1073 {
1074 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1075 goto err;
1076 }
1077
1078 /* Encode the public key.
1079 * First check the size of encoding and
1080 * allocate memory accordingly.
1081 */
1082 encodedlen = EC_POINT_point2oct(group,
1083 EC_KEY_get0_public_key(ecdh),
1084 POINT_CONVERSION_UNCOMPRESSED,
1085 NULL, 0, NULL);
1086
1087 encodedPoint = (unsigned char *)
1088 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1089 bn_ctx = BN_CTX_new();
1090 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1091 {
1092 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1093 goto err;
1094 }
1095
1096
1097 encodedlen = EC_POINT_point2oct(group,
1098 EC_KEY_get0_public_key(ecdh),
1099 POINT_CONVERSION_UNCOMPRESSED,
1100 encodedPoint, encodedlen, bn_ctx);
1101
1102 if (encodedlen == 0)
1103 {
1104 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1105 goto err;
1106 }
1107
1108 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1109
1110 /* XXX: For now, we only support named (not
1111 * generic) curves in ECDH ephemeral key exchanges.
1112 * In this situation, we need four additional bytes
1113 * to encode the entire ServerECDHParams
1114 * structure.
1115 */
1116 n = 4 + encodedlen;
1117
1118 /* We'll generate the serverKeyExchange message
1119 * explicitly so we can set these to NULLs
1120 */
1121 r[0]=NULL;
1122 r[1]=NULL;
1123 r[2]=NULL;
1124 r[3]=NULL;
1125 }
1126 else
1127 #endif /* !OPENSSL_NO_ECDH */
1128 #ifndef OPENSSL_NO_PSK
1129 if (type & SSL_kPSK)
1130 {
1131 /* reserve size for record length and PSK identity hint*/
1132 n+=2+strlen(s->ctx->psk_identity_hint);
1133 }
1134 else
1135 #endif /* !OPENSSL_NO_PSK */
1136 {
1137 al=SSL_AD_HANDSHAKE_FAILURE;
1138 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1139 goto f_err;
1140 }
1141 for (i=0; r[i] != NULL; i++)
1142 {
1143 nr[i]=BN_num_bytes(r[i]);
1144 n+=2+nr[i];
1145 }
1146
1147 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1148 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1149 {
1150 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1151 == NULL)
1152 {
1153 al=SSL_AD_DECODE_ERROR;
1154 goto f_err;
1155 }
1156 kn=EVP_PKEY_size(pkey);
1157 }
1158 else
1159 {
1160 pkey=NULL;
1161 kn=0;
1162 }
1163
1164 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1165 {
1166 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1167 goto err;
1168 }
1169 d=(unsigned char *)s->init_buf->data;
1170 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1171
1172 for (i=0; r[i] != NULL; i++)
1173 {
1174 s2n(nr[i],p);
1175 BN_bn2bin(r[i],p);
1176 p+=nr[i];
1177 }
1178
1179 #ifndef OPENSSL_NO_ECDH
1180 if (type & SSL_kEECDH)
1181 {
1182 /* XXX: For now, we only support named (not generic) curves.
1183 * In this situation, the serverKeyExchange message has:
1184 * [1 byte CurveType], [2 byte CurveName]
1185 * [1 byte length of encoded point], followed by
1186 * the actual encoded point itself
1187 */
1188 *p = NAMED_CURVE_TYPE;
1189 p += 1;
1190 *p = 0;
1191 p += 1;
1192 *p = curve_id;
1193 p += 1;
1194 *p = encodedlen;
1195 p += 1;
1196 memcpy((unsigned char*)p,
1197 (unsigned char *)encodedPoint,
1198 encodedlen);
1199 OPENSSL_free(encodedPoint);
1200 p += encodedlen;
1201 }
1202 #endif
1203
1204 #ifndef OPENSSL_NO_PSK
1205 if (type & SSL_kPSK)
1206 {
1207 /* copy PSK identity hint */
1208 s2n(strlen(s->ctx->psk_identity_hint), p);
1209 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1210 p+=strlen(s->ctx->psk_identity_hint);
1211 }
1212 #endif
1213
1214 /* not anonymous */
1215 if (pkey != NULL)
1216 {
1217 /* n is the length of the params, they start at
1218 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1219 * at the end. */
1220 #ifndef OPENSSL_NO_RSA
1221 if (pkey->type == EVP_PKEY_RSA)
1222 {
1223 q=md_buf;
1224 j=0;
1225 for (num=2; num > 0; num--)
1226 {
1227 EVP_DigestInit_ex(&md_ctx,(num == 2)
1228 ?s->ctx->md5:s->ctx->sha1, NULL);
1229 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1230 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1231 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1232 EVP_DigestFinal_ex(&md_ctx,q,
1233 (unsigned int *)&i);
1234 q+=i;
1235 j+=i;
1236 }
1237 if (RSA_sign(NID_md5_sha1, md_buf, j,
1238 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1239 {
1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1241 goto err;
1242 }
1243 s2n(u,p);
1244 n+=u+2;
1245 }
1246 else
1247 #endif
1248 #if !defined(OPENSSL_NO_DSA)
1249 if (pkey->type == EVP_PKEY_DSA)
1250 {
1251 /* lets do DSS */
1252 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1253 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1254 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1255 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1256 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1257 (unsigned int *)&i,pkey))
1258 {
1259 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1260 goto err;
1261 }
1262 s2n(i,p);
1263 n+=i+2;
1264 }
1265 else
1266 #endif
1267 #if !defined(OPENSSL_NO_ECDSA)
1268 if (pkey->type == EVP_PKEY_EC)
1269 {
1270 /* let's do ECDSA */
1271 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1272 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1273 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1274 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1275 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1276 (unsigned int *)&i,pkey))
1277 {
1278 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1279 goto err;
1280 }
1281 s2n(i,p);
1282 n+=i+2;
1283 }
1284 else
1285 #endif
1286 {
1287 /* Is this error check actually needed? */
1288 al=SSL_AD_HANDSHAKE_FAILURE;
1289 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1290 goto f_err;
1291 }
1292 }
1293
1294 d = dtls1_set_message_header(s, d,
1295 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1296
1297 /* we should now have things packed up, so lets send
1298 * it off */
1299 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1300 s->init_off=0;
1301
1302 /* buffer the message to handle re-xmits */
1303 dtls1_buffer_message(s, 0);
1304 }
1305
1306 s->state = SSL3_ST_SW_KEY_EXCH_B;
1307 EVP_MD_CTX_cleanup(&md_ctx);
1308 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1309 f_err:
1310 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1311 err:
1312 #ifndef OPENSSL_NO_ECDH
1313 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1314 BN_CTX_free(bn_ctx);
1315 #endif
1316 EVP_MD_CTX_cleanup(&md_ctx);
1317 return(-1);
1318 }
1319
dtls1_send_certificate_request(SSL * s)1320 int dtls1_send_certificate_request(SSL *s)
1321 {
1322 unsigned char *p,*d;
1323 int i,j,nl,off,n;
1324 STACK_OF(X509_NAME) *sk=NULL;
1325 X509_NAME *name;
1326 BUF_MEM *buf;
1327 unsigned int msg_len;
1328
1329 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1330 {
1331 buf=s->init_buf;
1332
1333 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1334
1335 /* get the list of acceptable cert types */
1336 p++;
1337 n=ssl3_get_req_cert_type(s,p);
1338 d[0]=n;
1339 p+=n;
1340 n++;
1341
1342 off=n;
1343 p+=2;
1344 n+=2;
1345
1346 sk=SSL_get_client_CA_list(s);
1347 nl=0;
1348 if (sk != NULL)
1349 {
1350 for (i=0; i<sk_X509_NAME_num(sk); i++)
1351 {
1352 name=sk_X509_NAME_value(sk,i);
1353 j=i2d_X509_NAME(name,NULL);
1354 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1355 {
1356 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1357 goto err;
1358 }
1359 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1360 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1361 {
1362 s2n(j,p);
1363 i2d_X509_NAME(name,&p);
1364 n+=2+j;
1365 nl+=2+j;
1366 }
1367 else
1368 {
1369 d=p;
1370 i2d_X509_NAME(name,&p);
1371 j-=2; s2n(j,d); j+=2;
1372 n+=j;
1373 nl+=j;
1374 }
1375 }
1376 }
1377 /* else no CA names */
1378 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1379 s2n(nl,p);
1380
1381 d=(unsigned char *)buf->data;
1382 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1383 l2n3(n,d);
1384 s2n(s->d1->handshake_write_seq,d);
1385 s->d1->handshake_write_seq++;
1386
1387 /* we should now have things packed up, so lets send
1388 * it off */
1389
1390 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1391 s->init_off=0;
1392 #ifdef NETSCAPE_HANG_BUG
1393 /* XXX: what to do about this? */
1394 p=(unsigned char *)s->init_buf->data + s->init_num;
1395
1396 /* do the header */
1397 *(p++)=SSL3_MT_SERVER_DONE;
1398 *(p++)=0;
1399 *(p++)=0;
1400 *(p++)=0;
1401 s->init_num += 4;
1402 #endif
1403
1404 /* XDTLS: set message header ? */
1405 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1406 dtls1_set_message_header(s, (void *)s->init_buf->data,
1407 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1408
1409 /* buffer the message to handle re-xmits */
1410 dtls1_buffer_message(s, 0);
1411
1412 s->state = SSL3_ST_SW_CERT_REQ_B;
1413 }
1414
1415 /* SSL3_ST_SW_CERT_REQ_B */
1416 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1417 err:
1418 return(-1);
1419 }
1420
dtls1_send_server_certificate(SSL * s)1421 int dtls1_send_server_certificate(SSL *s)
1422 {
1423 unsigned long l;
1424 X509 *x;
1425
1426 if (s->state == SSL3_ST_SW_CERT_A)
1427 {
1428 x=ssl_get_server_send_cert(s);
1429 if (x == NULL)
1430 {
1431 /* VRS: allow null cert if auth == KRB5 */
1432 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1433 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1434 {
1435 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1436 return(0);
1437 }
1438 }
1439
1440 l=dtls1_output_cert_chain(s,x);
1441 s->state=SSL3_ST_SW_CERT_B;
1442 s->init_num=(int)l;
1443 s->init_off=0;
1444
1445 /* buffer the message to handle re-xmits */
1446 dtls1_buffer_message(s, 0);
1447 }
1448
1449 /* SSL3_ST_SW_CERT_B */
1450 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1451 }
1452
1453 #ifndef OPENSSL_NO_TLSEXT
dtls1_send_newsession_ticket(SSL * s)1454 int dtls1_send_newsession_ticket(SSL *s)
1455 {
1456 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1457 {
1458 unsigned char *p, *senc, *macstart;
1459 int len, slen;
1460 unsigned int hlen, msg_len;
1461 EVP_CIPHER_CTX ctx;
1462 HMAC_CTX hctx;
1463 SSL_CTX *tctx = s->initial_ctx;
1464 unsigned char iv[EVP_MAX_IV_LENGTH];
1465 unsigned char key_name[16];
1466
1467 /* get session encoding length */
1468 slen = i2d_SSL_SESSION(s->session, NULL);
1469 /* Some length values are 16 bits, so forget it if session is
1470 * too long
1471 */
1472 if (slen > 0xFF00)
1473 return -1;
1474 /* Grow buffer if need be: the length calculation is as
1475 * follows 12 (DTLS handshake message header) +
1476 * 4 (ticket lifetime hint) + 2 (ticket length) +
1477 * 16 (key name) + max_iv_len (iv length) +
1478 * session_length + max_enc_block_size (max encrypted session
1479 * length) + max_md_size (HMAC).
1480 */
1481 if (!BUF_MEM_grow(s->init_buf,
1482 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1483 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1484 return -1;
1485 senc = OPENSSL_malloc(slen);
1486 if (!senc)
1487 return -1;
1488 p = senc;
1489 i2d_SSL_SESSION(s->session, &p);
1490
1491 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1492 EVP_CIPHER_CTX_init(&ctx);
1493 HMAC_CTX_init(&hctx);
1494 /* Initialize HMAC and cipher contexts. If callback present
1495 * it does all the work otherwise use generated values
1496 * from parent ctx.
1497 */
1498 if (tctx->tlsext_ticket_key_cb)
1499 {
1500 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1501 &hctx, 1) < 0)
1502 {
1503 OPENSSL_free(senc);
1504 return -1;
1505 }
1506 }
1507 else
1508 {
1509 RAND_pseudo_bytes(iv, 16);
1510 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1511 tctx->tlsext_tick_aes_key, iv);
1512 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1513 tlsext_tick_md(), NULL);
1514 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1515 }
1516 l2n(s->session->tlsext_tick_lifetime_hint, p);
1517 /* Skip ticket length for now */
1518 p += 2;
1519 /* Output key name */
1520 macstart = p;
1521 memcpy(p, key_name, 16);
1522 p += 16;
1523 /* output IV */
1524 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1525 p += EVP_CIPHER_CTX_iv_length(&ctx);
1526 /* Encrypt session data */
1527 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1528 p += len;
1529 EVP_EncryptFinal(&ctx, p, &len);
1530 p += len;
1531 EVP_CIPHER_CTX_cleanup(&ctx);
1532
1533 HMAC_Update(&hctx, macstart, p - macstart);
1534 HMAC_Final(&hctx, p, &hlen);
1535 HMAC_CTX_cleanup(&hctx);
1536
1537 p += hlen;
1538 /* Now write out lengths: p points to end of data written */
1539 /* Total length */
1540 len = p - (unsigned char *)(s->init_buf->data);
1541 /* Ticket length */
1542 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1543 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1544
1545 /* number of bytes to write */
1546 s->init_num= len;
1547 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1548 s->init_off=0;
1549 OPENSSL_free(senc);
1550
1551 /* XDTLS: set message header ? */
1552 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1553 dtls1_set_message_header(s, (void *)s->init_buf->data,
1554 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1555
1556 /* buffer the message to handle re-xmits */
1557 dtls1_buffer_message(s, 0);
1558 }
1559
1560 /* SSL3_ST_SW_SESSION_TICKET_B */
1561 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1562 }
1563 #endif
1564