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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
129static const SSL_METHOD *dtls1_get_server_method(int ver);
130static int dtls1_send_hello_verify_request(SSL *s);
131
132static 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
140IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
141 dtls1_accept,
142 ssl_undefined_function,
143 dtls1_get_server_method)
144
145int 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
154 RAND_add(&Time,sizeof(Time),0);
155 ERR_clear_error();
156 clear_sys_error();
157
158 if (s->info_callback != NULL)
159 cb=s->info_callback;
160 else if (s->ctx->info_callback != NULL)
161 cb=s->ctx->info_callback;
162
163 /* init things to blank */
164 s->in_handshake++;
165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
166
167 if (s->cert == NULL)
168 {
169 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
170 return(-1);
171 }
172
173 for (;;)
174 {
175 state=s->state;
176
177 switch (s->state)
178 {
179 case SSL_ST_RENEGOTIATE:
180 s->new_session=1;
181 /* s->state=SSL_ST_ACCEPT; */
182
183 case SSL_ST_BEFORE:
184 case SSL_ST_ACCEPT:
185 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
186 case SSL_ST_OK|SSL_ST_ACCEPT:
187
188 s->server=1;
189 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
190
191 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
192 {
193 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
194 return -1;
195 }
196 s->type=SSL_ST_ACCEPT;
197
198 if (s->init_buf == NULL)
199 {
200 if ((buf=BUF_MEM_new()) == NULL)
201 {
202 ret= -1;
203 goto end;
204 }
205 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
206 {
207 ret= -1;
208 goto end;
209 }
210 s->init_buf=buf;
211 }
212
213 if (!ssl3_setup_buffers(s))
214 {
215 ret= -1;
216 goto end;
217 }
218
219 s->init_num=0;
220
221 if (s->state != SSL_ST_RENEGOTIATE)
222 {
223 /* Ok, we now need to push on a buffering BIO so that
224 * the output is sent in a way that TCP likes :-)
225 */
226 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
227
228 ssl3_init_finished_mac(s);
229 s->state=SSL3_ST_SR_CLNT_HELLO_A;
230 s->ctx->stats.sess_accept++;
231 }
232 else
233 {
234 /* s->state == SSL_ST_RENEGOTIATE,
235 * we will just send a HelloRequest */
236 s->ctx->stats.sess_accept_renegotiate++;
237 s->state=SSL3_ST_SW_HELLO_REQ_A;
238 }
239
240 break;
241
242 case SSL3_ST_SW_HELLO_REQ_A:
243 case SSL3_ST_SW_HELLO_REQ_B:
244
245 s->shutdown=0;
246 dtls1_start_timer(s);
247 ret=dtls1_send_hello_request(s);
248 if (ret <= 0) goto end;
249 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
250 s->state=SSL3_ST_SW_FLUSH;
251 s->init_num=0;
252
253 ssl3_init_finished_mac(s);
254 break;
255
256 case SSL3_ST_SW_HELLO_REQ_C:
257 s->state=SSL_ST_OK;
258 break;
259
260 case SSL3_ST_SR_CLNT_HELLO_A:
261 case SSL3_ST_SR_CLNT_HELLO_B:
262 case SSL3_ST_SR_CLNT_HELLO_C:
263
264 s->shutdown=0;
265 ret=ssl3_get_client_hello(s);
266 if (ret <= 0) goto end;
267 dtls1_stop_timer(s);
268
269 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
270 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
271 else
272 s->state = SSL3_ST_SW_SRVR_HELLO_A;
273
274 s->init_num=0;
275
276 /* If we're just listening, stop here */
277 if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
278 {
279 ret = 2;
280 s->d1->listen = 0;
281 goto end;
282 }
283
284 break;
285
286 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
287 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
288
289 dtls1_start_timer(s);
290 ret = dtls1_send_hello_verify_request(s);
291 if ( ret <= 0) goto end;
292 s->state=SSL3_ST_SW_FLUSH;
293 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
294
295 /* HelloVerifyRequest resets Finished MAC */
296 if (s->version != DTLS1_BAD_VER)
297 ssl3_init_finished_mac(s);
298 break;
299
300 case SSL3_ST_SW_SRVR_HELLO_A:
301 case SSL3_ST_SW_SRVR_HELLO_B:
302 s->new_session = 2;
303 dtls1_start_timer(s);
304 ret=dtls1_send_server_hello(s);
305 if (ret <= 0) goto end;
306
307#ifndef OPENSSL_NO_TLSEXT
308 if (s->hit)
309 {
310 if (s->tlsext_ticket_expected)
311 s->state=SSL3_ST_SW_SESSION_TICKET_A;
312 else
313 s->state=SSL3_ST_SW_CHANGE_A;
314 }
315#else
316 if (s->hit)
317 s->state=SSL3_ST_SW_CHANGE_A;
318#endif
319 else
320 s->state=SSL3_ST_SW_CERT_A;
321 s->init_num=0;
322 break;
323
324 case SSL3_ST_SW_CERT_A:
325 case SSL3_ST_SW_CERT_B:
326 /* Check if it is anon DH or normal PSK */
327 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
328 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
329 {
330 dtls1_start_timer(s);
331 ret=dtls1_send_server_certificate(s);
332 if (ret <= 0) goto end;
333#ifndef OPENSSL_NO_TLSEXT
334 if (s->tlsext_status_expected)
335 s->state=SSL3_ST_SW_CERT_STATUS_A;
336 else
337 s->state=SSL3_ST_SW_KEY_EXCH_A;
338 }
339 else
340 {
341 skip = 1;
342 s->state=SSL3_ST_SW_KEY_EXCH_A;
343 }
344#else
345 }
346 else
347 skip=1;
348
349 s->state=SSL3_ST_SW_KEY_EXCH_A;
350#endif
351 s->init_num=0;
352 break;
353
354 case SSL3_ST_SW_KEY_EXCH_A:
355 case SSL3_ST_SW_KEY_EXCH_B:
356 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
357
358 /* clear this, it may get reset by
359 * send_server_key_exchange */
360 if ((s->options & SSL_OP_EPHEMERAL_RSA)
361#ifndef OPENSSL_NO_KRB5
362 && !(alg_k & SSL_kKRB5)
363#endif /* OPENSSL_NO_KRB5 */
364 )
365 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
366 * even when forbidden by protocol specs
367 * (handshake may fail as clients are not required to
368 * be able to handle this) */
369 s->s3->tmp.use_rsa_tmp=1;
370 else
371 s->s3->tmp.use_rsa_tmp=0;
372
373 /* only send if a DH key exchange or
374 * RSA but we have a sign only certificate */
375 if (s->s3->tmp.use_rsa_tmp
376 /* PSK: send ServerKeyExchange if PSK identity
377 * hint if provided */
378#ifndef OPENSSL_NO_PSK
379 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
380#endif
381 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
382 || (alg_k & SSL_kEECDH)
383 || ((alg_k & SSL_kRSA)
384 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
385 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
386 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
387 )
388 )
389 )
390 )
391 {
392 dtls1_start_timer(s);
393 ret=dtls1_send_server_key_exchange(s);
394 if (ret <= 0) goto end;
395 }
396 else
397 skip=1;
398
399 s->state=SSL3_ST_SW_CERT_REQ_A;
400 s->init_num=0;
401 break;
402
403 case SSL3_ST_SW_CERT_REQ_A:
404 case SSL3_ST_SW_CERT_REQ_B:
405 if (/* don't request cert unless asked for it: */
406 !(s->verify_mode & SSL_VERIFY_PEER) ||
407 /* if SSL_VERIFY_CLIENT_ONCE is set,
408 * don't request cert during re-negotiation: */
409 ((s->session->peer != NULL) &&
410 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
411 /* never request cert in anonymous ciphersuites
412 * (see section "Certificate request" in SSL 3 drafts
413 * and in RFC 2246): */
414 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
415 /* ... except when the application insists on verification
416 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
417 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
418 /* never request cert in Kerberos ciphersuites */
419 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
420 /* With normal PSK Certificates and
421 * Certificate Requests are omitted */
422 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
423 {
424 /* no cert request */
425 skip=1;
426 s->s3->tmp.cert_request=0;
427 s->state=SSL3_ST_SW_SRVR_DONE_A;
428 }
429 else
430 {
431 s->s3->tmp.cert_request=1;
432 dtls1_start_timer(s);
433 ret=dtls1_send_certificate_request(s);
434 if (ret <= 0) goto end;
435#ifndef NETSCAPE_HANG_BUG
436 s->state=SSL3_ST_SW_SRVR_DONE_A;
437#else
438 s->state=SSL3_ST_SW_FLUSH;
439 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
440#endif
441 s->init_num=0;
442 }
443 break;
444
445 case SSL3_ST_SW_SRVR_DONE_A:
446 case SSL3_ST_SW_SRVR_DONE_B:
447 dtls1_start_timer(s);
448 ret=dtls1_send_server_done(s);
449 if (ret <= 0) goto end;
450 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
451 s->state=SSL3_ST_SW_FLUSH;
452 s->init_num=0;
453 break;
454
455 case SSL3_ST_SW_FLUSH:
456 s->rwstate=SSL_WRITING;
457 if (BIO_flush(s->wbio) <= 0)
458 {
459 ret= -1;
460 goto end;
461 }
462 s->rwstate=SSL_NOTHING;
463 s->state=s->s3->tmp.next_state;
464 break;
465
466 case SSL3_ST_SR_CERT_A:
467 case SSL3_ST_SR_CERT_B:
468 /* Check for second client hello (MS SGC) */
469 ret = ssl3_check_client_hello(s);
470 if (ret <= 0)
471 goto end;
472 dtls1_stop_timer(s);
473 if (ret == 2)
474 s->state = SSL3_ST_SR_CLNT_HELLO_C;
475 else {
476 /* could be sent for a DH cert, even if we
477 * have not asked for it :-) */
478 ret=ssl3_get_client_certificate(s);
479 if (ret <= 0) goto end;
480 dtls1_stop_timer(s);
481 s->init_num=0;
482 s->state=SSL3_ST_SR_KEY_EXCH_A;
483 }
484 break;
485
486 case SSL3_ST_SR_KEY_EXCH_A:
487 case SSL3_ST_SR_KEY_EXCH_B:
488 ret=ssl3_get_client_key_exchange(s);
489 if (ret <= 0) goto end;
490 dtls1_stop_timer(s);
491 s->state=SSL3_ST_SR_CERT_VRFY_A;
492 s->init_num=0;
493
494 if (ret == 2)
495 {
496 /* For the ECDH ciphersuites when
497 * the client sends its ECDH pub key in
498 * a certificate, the CertificateVerify
499 * message is not sent.
500 */
501 s->state=SSL3_ST_SR_FINISHED_A;
502 s->init_num = 0;
503 }
504 else
505 {
506 s->state=SSL3_ST_SR_CERT_VRFY_A;
507 s->init_num=0;
508
509 /* We need to get hashes here so if there is
510 * a client cert, it can be verified */
511 s->method->ssl3_enc->cert_verify_mac(s,
512 NID_md5,
513 &(s->s3->tmp.cert_verify_md[0]));
514 s->method->ssl3_enc->cert_verify_mac(s,
515 NID_sha1,
516 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
517 }
518 break;
519
520 case SSL3_ST_SR_CERT_VRFY_A:
521 case SSL3_ST_SR_CERT_VRFY_B:
522
523 s->d1->change_cipher_spec_ok = 1;
524 /* we should decide if we expected this one */
525 ret=ssl3_get_cert_verify(s);
526 if (ret <= 0) goto end;
527 dtls1_stop_timer(s);
528
529 s->state=SSL3_ST_SR_FINISHED_A;
530 s->init_num=0;
531 break;
532
533 case SSL3_ST_SR_FINISHED_A:
534 case SSL3_ST_SR_FINISHED_B:
535 s->d1->change_cipher_spec_ok = 1;
536 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
537 SSL3_ST_SR_FINISHED_B);
538 if (ret <= 0) goto end;
539 dtls1_stop_timer(s);
540 if (s->hit)
541 s->state=SSL_ST_OK;
542#ifndef OPENSSL_NO_TLSEXT
543 else if (s->tlsext_ticket_expected)
544 s->state=SSL3_ST_SW_SESSION_TICKET_A;
545#endif
546 else
547 s->state=SSL3_ST_SW_CHANGE_A;
548 s->init_num=0;
549 break;
550
551#ifndef OPENSSL_NO_TLSEXT
552 case SSL3_ST_SW_SESSION_TICKET_A:
553 case SSL3_ST_SW_SESSION_TICKET_B:
554 ret=dtls1_send_newsession_ticket(s);
555 if (ret <= 0) goto end;
556 s->state=SSL3_ST_SW_CHANGE_A;
557 s->init_num=0;
558 break;
559
560 case SSL3_ST_SW_CERT_STATUS_A:
561 case SSL3_ST_SW_CERT_STATUS_B:
562 ret=ssl3_send_cert_status(s);
563 if (ret <= 0) goto end;
564 s->state=SSL3_ST_SW_KEY_EXCH_A;
565 s->init_num=0;
566 break;
567
568#endif
569
570 case SSL3_ST_SW_CHANGE_A:
571 case SSL3_ST_SW_CHANGE_B:
572
573 s->session->cipher=s->s3->tmp.new_cipher;
574 if (!s->method->ssl3_enc->setup_key_block(s))
575 { ret= -1; goto end; }
576
577 ret=dtls1_send_change_cipher_spec(s,
578 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
579
580 if (ret <= 0) goto end;
581 s->state=SSL3_ST_SW_FINISHED_A;
582 s->init_num=0;
583
584 if (!s->method->ssl3_enc->change_cipher_state(s,
585 SSL3_CHANGE_CIPHER_SERVER_WRITE))
586 {
587 ret= -1;
588 goto end;
589 }
590
591 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
592 break;
593
594 case SSL3_ST_SW_FINISHED_A:
595 case SSL3_ST_SW_FINISHED_B:
596 ret=dtls1_send_finished(s,
597 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
598 s->method->ssl3_enc->server_finished_label,
599 s->method->ssl3_enc->server_finished_label_len);
600 if (ret <= 0) goto end;
601 s->state=SSL3_ST_SW_FLUSH;
602 if (s->hit)
603 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
604 else
605 s->s3->tmp.next_state=SSL_ST_OK;
606 s->init_num=0;
607 break;
608
609 case SSL_ST_OK:
610 /* clean a few things up */
611 ssl3_cleanup_key_block(s);
612
613#if 0
614 BUF_MEM_free(s->init_buf);
615 s->init_buf=NULL;
616#endif
617
618 /* remove buffering on output */
619 ssl_free_wbio_buffer(s);
620
621 s->init_num=0;
622
623 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
624 {
625 /* actually not necessarily a 'new' session unless
626 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
627
628 s->new_session=0;
629
630 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
631
632 s->ctx->stats.sess_accept_good++;
633 /* s->server=1; */
634 s->handshake_func=dtls1_accept;
635
636 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
637 }
638
639 ret = 1;
640
641 /* done handshaking, next message is client hello */
642 s->d1->handshake_read_seq = 0;
643 /* next message is server hello */
644 s->d1->handshake_write_seq = 0;
645 s->d1->next_handshake_write_seq = 0;
646 goto end;
647 /* break; */
648
649 default:
650 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
651 ret= -1;
652 goto end;
653 /* break; */
654 }
655
656 if (!s->s3->tmp.reuse_message && !skip)
657 {
658 if (s->debug)
659 {
660 if ((ret=BIO_flush(s->wbio)) <= 0)
661 goto end;
662 }
663
664
665 if ((cb != NULL) && (s->state != state))
666 {
667 new_state=s->state;
668 s->state=state;
669 cb(s,SSL_CB_ACCEPT_LOOP,1);
670 s->state=new_state;
671 }
672 }
673 skip=0;
674 }
675end:
676 /* BIO_flush(s->wbio); */
677
678 s->in_handshake--;
679 if (cb != NULL)
680 cb(s,SSL_CB_ACCEPT_EXIT,ret);
681 return(ret);
682 }
683
684int dtls1_send_hello_request(SSL *s)
685 {
686 unsigned char *p;
687
688 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
689 {
690 p=(unsigned char *)s->init_buf->data;
691 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
692
693 s->state=SSL3_ST_SW_HELLO_REQ_B;
694 /* number of bytes to write */
695 s->init_num=DTLS1_HM_HEADER_LENGTH;
696 s->init_off=0;
697
698 /* no need to buffer this message, since there are no retransmit
699 * requests for it */
700 }
701
702 /* SSL3_ST_SW_HELLO_REQ_B */
703 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
704 }
705
706int dtls1_send_hello_verify_request(SSL *s)
707 {
708 unsigned int msg_len;
709 unsigned char *msg, *buf, *p;
710
711 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
712 {
713 buf = (unsigned char *)s->init_buf->data;
714
715 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
716 *(p++) = s->version >> 8;
717 *(p++) = s->version & 0xFF;
718
719 if (s->ctx->app_gen_cookie_cb == NULL ||
720 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
721 &(s->d1->cookie_len)) == 0)
722 {
723 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
724 return 0;
725 }
726
727 *(p++) = (unsigned char) s->d1->cookie_len;
728 memcpy(p, s->d1->cookie, s->d1->cookie_len);
729 p += s->d1->cookie_len;
730 msg_len = p - msg;
731
732 dtls1_set_message_header(s, buf,
733 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
734
735 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
736 /* number of bytes to write */
737 s->init_num=p-buf;
738 s->init_off=0;
739
740 /* buffer the message to handle re-xmits */
741 dtls1_buffer_message(s, 0);
742 }
743
744 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
745 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
746 }
747
748int dtls1_send_server_hello(SSL *s)
749 {
750 unsigned char *buf;
751 unsigned char *p,*d;
752 int i;
753 unsigned int sl;
754 unsigned long l,Time;
755
756 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
757 {
758 buf=(unsigned char *)s->init_buf->data;
759 p=s->s3->server_random;
760 Time=(unsigned long)time(NULL); /* Time */
761 l2n(Time,p);
762 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
763 /* Do the message type and length last */
764 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
765
766 *(p++)=s->version>>8;
767 *(p++)=s->version&0xff;
768
769 /* Random stuff */
770 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
771 p+=SSL3_RANDOM_SIZE;
772
773 /* now in theory we have 3 options to sending back the
774 * session id. If it is a re-use, we send back the
775 * old session-id, if it is a new session, we send
776 * back the new session-id or we send back a 0 length
777 * session-id if we want it to be single use.
778 * Currently I will not implement the '0' length session-id
779 * 12-Jan-98 - I'll now support the '0' length stuff.
780 */
781 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
782 s->session->session_id_length=0;
783
784 sl=s->session->session_id_length;
785 if (sl > sizeof s->session->session_id)
786 {
787 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
788 return -1;
789 }
790 *(p++)=sl;
791 memcpy(p,s->session->session_id,sl);
792 p+=sl;
793
794 /* put the cipher */
795 if (s->s3->tmp.new_cipher == NULL)
796 return -1;
797 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
798 p+=i;
799
800 /* put the compression method */
801#ifdef OPENSSL_NO_COMP
802 *(p++)=0;
803#else
804 if (s->s3->tmp.new_compression == NULL)
805 *(p++)=0;
806 else
807 *(p++)=s->s3->tmp.new_compression->id;
808#endif
809
810#ifndef OPENSSL_NO_TLSEXT
811 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
812 {
813 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
814 return -1;
815 }
816#endif
817
818 /* do the header */
819 l=(p-d);
820 d=buf;
821
822 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
823
824 s->state=SSL3_ST_SW_SRVR_HELLO_B;
825 /* number of bytes to write */
826 s->init_num=p-buf;
827 s->init_off=0;
828
829 /* buffer the message to handle re-xmits */
830 dtls1_buffer_message(s, 0);
831 }
832
833 /* SSL3_ST_SW_SRVR_HELLO_B */
834 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
835 }
836
837int dtls1_send_server_done(SSL *s)
838 {
839 unsigned char *p;
840
841 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
842 {
843 p=(unsigned char *)s->init_buf->data;
844
845 /* do the header */
846 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
847
848 s->state=SSL3_ST_SW_SRVR_DONE_B;
849 /* number of bytes to write */
850 s->init_num=DTLS1_HM_HEADER_LENGTH;
851 s->init_off=0;
852
853 /* buffer the message to handle re-xmits */
854 dtls1_buffer_message(s, 0);
855 }
856
857 /* SSL3_ST_SW_SRVR_DONE_B */
858 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
859 }
860
861int dtls1_send_server_key_exchange(SSL *s)
862 {
863#ifndef OPENSSL_NO_RSA
864 unsigned char *q;
865 int j,num;
866 RSA *rsa;
867 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
868 unsigned int u;
869#endif
870#ifndef OPENSSL_NO_DH
871 DH *dh=NULL,*dhp;
872#endif
873#ifndef OPENSSL_NO_ECDH
874 EC_KEY *ecdh=NULL, *ecdhp;
875 unsigned char *encodedPoint = NULL;
876 int encodedlen = 0;
877 int curve_id = 0;
878 BN_CTX *bn_ctx = NULL;
879#endif
880 EVP_PKEY *pkey;
881 unsigned char *p,*d;
882 int al,i;
883 unsigned long type;
884 int n;
885 CERT *cert;
886 BIGNUM *r[4];
887 int nr[4],kn;
888 BUF_MEM *buf;
889 EVP_MD_CTX md_ctx;
890
891 EVP_MD_CTX_init(&md_ctx);
892 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
893 {
894 type=s->s3->tmp.new_cipher->algorithm_mkey;
895 cert=s->cert;
896
897 buf=s->init_buf;
898
899 r[0]=r[1]=r[2]=r[3]=NULL;
900 n=0;
901#ifndef OPENSSL_NO_RSA
902 if (type & SSL_kRSA)
903 {
904 rsa=cert->rsa_tmp;
905 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
906 {
907 rsa=s->cert->rsa_tmp_cb(s,
908 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
909 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
910 if(rsa == NULL)
911 {
912 al=SSL_AD_HANDSHAKE_FAILURE;
913 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
914 goto f_err;
915 }
916 RSA_up_ref(rsa);
917 cert->rsa_tmp=rsa;
918 }
919 if (rsa == NULL)
920 {
921 al=SSL_AD_HANDSHAKE_FAILURE;
922 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
923 goto f_err;
924 }
925 r[0]=rsa->n;
926 r[1]=rsa->e;
927 s->s3->tmp.use_rsa_tmp=1;
928 }
929 else
930#endif
931#ifndef OPENSSL_NO_DH
932 if (type & SSL_kEDH)
933 {
934 dhp=cert->dh_tmp;
935 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
936 dhp=s->cert->dh_tmp_cb(s,
937 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
938 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
939 if (dhp == NULL)
940 {
941 al=SSL_AD_HANDSHAKE_FAILURE;
942 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
943 goto f_err;
944 }
945
946 if (s->s3->tmp.dh != NULL)
947 {
948 DH_free(dh);
949 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
950 goto err;
951 }
952
953 if ((dh=DHparams_dup(dhp)) == NULL)
954 {
955 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
956 goto err;
957 }
958
959 s->s3->tmp.dh=dh;
960 if ((dhp->pub_key == NULL ||
961 dhp->priv_key == NULL ||
962 (s->options & SSL_OP_SINGLE_DH_USE)))
963 {
964 if(!DH_generate_key(dh))
965 {
966 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
967 ERR_R_DH_LIB);
968 goto err;
969 }
970 }
971 else
972 {
973 dh->pub_key=BN_dup(dhp->pub_key);
974 dh->priv_key=BN_dup(dhp->priv_key);
975 if ((dh->pub_key == NULL) ||
976 (dh->priv_key == NULL))
977 {
978 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
979 goto err;
980 }
981 }
982 r[0]=dh->p;
983 r[1]=dh->g;
984 r[2]=dh->pub_key;
985 }
986 else
987#endif
988#ifndef OPENSSL_NO_ECDH
989 if (type & SSL_kEECDH)
990 {
991 const EC_GROUP *group;
992
993 ecdhp=cert->ecdh_tmp;
994 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
995 {
996 ecdhp=s->cert->ecdh_tmp_cb(s,
997 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
998 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
999 }
1000 if (ecdhp == NULL)
1001 {
1002 al=SSL_AD_HANDSHAKE_FAILURE;
1003 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1004 goto f_err;
1005 }
1006
1007 if (s->s3->tmp.ecdh != NULL)
1008 {
1009 EC_KEY_free(s->s3->tmp.ecdh);
1010 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1011 goto err;
1012 }
1013
1014 /* Duplicate the ECDH structure. */
1015 if (ecdhp == NULL)
1016 {
1017 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1018 goto err;
1019 }
1020 if (!EC_KEY_up_ref(ecdhp))
1021 {
1022 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1023 goto err;
1024 }
1025 ecdh = ecdhp;
1026
1027 s->s3->tmp.ecdh=ecdh;
1028 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1029 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1030 (s->options & SSL_OP_SINGLE_ECDH_USE))
1031 {
1032 if(!EC_KEY_generate_key(ecdh))
1033 {
1034 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1035 goto err;
1036 }
1037 }
1038
1039 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1040 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1041 (EC_KEY_get0_private_key(ecdh) == NULL))
1042 {
1043 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1044 goto err;
1045 }
1046
1047 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1048 (EC_GROUP_get_degree(group) > 163))
1049 {
1050 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1051 goto err;
1052 }
1053
1054 /* XXX: For now, we only support ephemeral ECDH
1055 * keys over named (not generic) curves. For
1056 * supported named curves, curve_id is non-zero.
1057 */
1058 if ((curve_id =
1059 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1060 == 0)
1061 {
1062 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1063 goto err;
1064 }
1065
1066 /* Encode the public key.
1067 * First check the size of encoding and
1068 * allocate memory accordingly.
1069 */
1070 encodedlen = EC_POINT_point2oct(group,
1071 EC_KEY_get0_public_key(ecdh),
1072 POINT_CONVERSION_UNCOMPRESSED,
1073 NULL, 0, NULL);
1074
1075 encodedPoint = (unsigned char *)
1076 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1077 bn_ctx = BN_CTX_new();
1078 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1079 {
1080 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1081 goto err;
1082 }
1083
1084
1085 encodedlen = EC_POINT_point2oct(group,
1086 EC_KEY_get0_public_key(ecdh),
1087 POINT_CONVERSION_UNCOMPRESSED,
1088 encodedPoint, encodedlen, bn_ctx);
1089
1090 if (encodedlen == 0)
1091 {
1092 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1093 goto err;
1094 }
1095
1096 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1097
1098 /* XXX: For now, we only support named (not
1099 * generic) curves in ECDH ephemeral key exchanges.
1100 * In this situation, we need four additional bytes
1101 * to encode the entire ServerECDHParams
1102 * structure.
1103 */
1104 n = 4 + encodedlen;
1105
1106 /* We'll generate the serverKeyExchange message
1107 * explicitly so we can set these to NULLs
1108 */
1109 r[0]=NULL;
1110 r[1]=NULL;
1111 r[2]=NULL;
1112 r[3]=NULL;
1113 }
1114 else
1115#endif /* !OPENSSL_NO_ECDH */
1116#ifndef OPENSSL_NO_PSK
1117 if (type & SSL_kPSK)
1118 {
1119 /* reserve size for record length and PSK identity hint*/
1120 n+=2+strlen(s->ctx->psk_identity_hint);
1121 }
1122 else
1123#endif /* !OPENSSL_NO_PSK */
1124 {
1125 al=SSL_AD_HANDSHAKE_FAILURE;
1126 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1127 goto f_err;
1128 }
1129 for (i=0; r[i] != NULL; i++)
1130 {
1131 nr[i]=BN_num_bytes(r[i]);
1132 n+=2+nr[i];
1133 }
1134
1135 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1136 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1137 {
1138 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1139 == NULL)
1140 {
1141 al=SSL_AD_DECODE_ERROR;
1142 goto f_err;
1143 }
1144 kn=EVP_PKEY_size(pkey);
1145 }
1146 else
1147 {
1148 pkey=NULL;
1149 kn=0;
1150 }
1151
1152 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1153 {
1154 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1155 goto err;
1156 }
1157 d=(unsigned char *)s->init_buf->data;
1158 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1159
1160 for (i=0; r[i] != NULL; i++)
1161 {
1162 s2n(nr[i],p);
1163 BN_bn2bin(r[i],p);
1164 p+=nr[i];
1165 }
1166
1167#ifndef OPENSSL_NO_ECDH
1168 if (type & SSL_kEECDH)
1169 {
1170 /* XXX: For now, we only support named (not generic) curves.
1171 * In this situation, the serverKeyExchange message has:
1172 * [1 byte CurveType], [2 byte CurveName]
1173 * [1 byte length of encoded point], followed by
1174 * the actual encoded point itself
1175 */
1176 *p = NAMED_CURVE_TYPE;
1177 p += 1;
1178 *p = 0;
1179 p += 1;
1180 *p = curve_id;
1181 p += 1;
1182 *p = encodedlen;
1183 p += 1;
1184 memcpy((unsigned char*)p,
1185 (unsigned char *)encodedPoint,
1186 encodedlen);
1187 OPENSSL_free(encodedPoint);
1188 p += encodedlen;
1189 }
1190#endif
1191
1192#ifndef OPENSSL_NO_PSK
1193 if (type & SSL_kPSK)
1194 {
1195 /* copy PSK identity hint */
1196 s2n(strlen(s->ctx->psk_identity_hint), p);
1197 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1198 p+=strlen(s->ctx->psk_identity_hint);
1199 }
1200#endif
1201
1202 /* not anonymous */
1203 if (pkey != NULL)
1204 {
1205 /* n is the length of the params, they start at
1206 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1207 * at the end. */
1208#ifndef OPENSSL_NO_RSA
1209 if (pkey->type == EVP_PKEY_RSA)
1210 {
1211 q=md_buf;
1212 j=0;
1213 for (num=2; num > 0; num--)
1214 {
1215 EVP_DigestInit_ex(&md_ctx,(num == 2)
1216 ?s->ctx->md5:s->ctx->sha1, NULL);
1217 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1218 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1219 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1220 EVP_DigestFinal_ex(&md_ctx,q,
1221 (unsigned int *)&i);
1222 q+=i;
1223 j+=i;
1224 }
1225 if (RSA_sign(NID_md5_sha1, md_buf, j,
1226 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1227 {
1228 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1229 goto err;
1230 }
1231 s2n(u,p);
1232 n+=u+2;
1233 }
1234 else
1235#endif
1236#if !defined(OPENSSL_NO_DSA)
1237 if (pkey->type == EVP_PKEY_DSA)
1238 {
1239 /* lets do DSS */
1240 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1241 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1242 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1243 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1244 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1245 (unsigned int *)&i,pkey))
1246 {
1247 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1248 goto err;
1249 }
1250 s2n(i,p);
1251 n+=i+2;
1252 }
1253 else
1254#endif
1255#if !defined(OPENSSL_NO_ECDSA)
1256 if (pkey->type == EVP_PKEY_EC)
1257 {
1258 /* let's do ECDSA */
1259 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1260 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1261 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1262 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1263 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1264 (unsigned int *)&i,pkey))
1265 {
1266 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1267 goto err;
1268 }
1269 s2n(i,p);
1270 n+=i+2;
1271 }
1272 else
1273#endif
1274 {
1275 /* Is this error check actually needed? */
1276 al=SSL_AD_HANDSHAKE_FAILURE;
1277 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1278 goto f_err;
1279 }
1280 }
1281
1282 d = dtls1_set_message_header(s, d,
1283 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1284
1285 /* we should now have things packed up, so lets send
1286 * it off */
1287 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1288 s->init_off=0;
1289
1290 /* buffer the message to handle re-xmits */
1291 dtls1_buffer_message(s, 0);
1292 }
1293
1294 s->state = SSL3_ST_SW_KEY_EXCH_B;
1295 EVP_MD_CTX_cleanup(&md_ctx);
1296 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1297f_err:
1298 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1299err:
1300#ifndef OPENSSL_NO_ECDH
1301 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1302 BN_CTX_free(bn_ctx);
1303#endif
1304 EVP_MD_CTX_cleanup(&md_ctx);
1305 return(-1);
1306 }
1307
1308int dtls1_send_certificate_request(SSL *s)
1309 {
1310 unsigned char *p,*d;
1311 int i,j,nl,off,n;
1312 STACK_OF(X509_NAME) *sk=NULL;
1313 X509_NAME *name;
1314 BUF_MEM *buf;
1315 unsigned int msg_len;
1316
1317 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1318 {
1319 buf=s->init_buf;
1320
1321 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1322
1323 /* get the list of acceptable cert types */
1324 p++;
1325 n=ssl3_get_req_cert_type(s,p);
1326 d[0]=n;
1327 p+=n;
1328 n++;
1329
1330 off=n;
1331 p+=2;
1332 n+=2;
1333
1334 sk=SSL_get_client_CA_list(s);
1335 nl=0;
1336 if (sk != NULL)
1337 {
1338 for (i=0; i<sk_X509_NAME_num(sk); i++)
1339 {
1340 name=sk_X509_NAME_value(sk,i);
1341 j=i2d_X509_NAME(name,NULL);
1342 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1343 {
1344 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1345 goto err;
1346 }
1347 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1348 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1349 {
1350 s2n(j,p);
1351 i2d_X509_NAME(name,&p);
1352 n+=2+j;
1353 nl+=2+j;
1354 }
1355 else
1356 {
1357 d=p;
1358 i2d_X509_NAME(name,&p);
1359 j-=2; s2n(j,d); j+=2;
1360 n+=j;
1361 nl+=j;
1362 }
1363 }
1364 }
1365 /* else no CA names */
1366 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1367 s2n(nl,p);
1368
1369 d=(unsigned char *)buf->data;
1370 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1371 l2n3(n,d);
1372 s2n(s->d1->handshake_write_seq,d);
1373 s->d1->handshake_write_seq++;
1374
1375 /* we should now have things packed up, so lets send
1376 * it off */
1377
1378 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1379 s->init_off=0;
1380#ifdef NETSCAPE_HANG_BUG
1381/* XXX: what to do about this? */
1382 p=(unsigned char *)s->init_buf->data + s->init_num;
1383
1384 /* do the header */
1385 *(p++)=SSL3_MT_SERVER_DONE;
1386 *(p++)=0;
1387 *(p++)=0;
1388 *(p++)=0;
1389 s->init_num += 4;
1390#endif
1391
1392 /* XDTLS: set message header ? */
1393 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1394 dtls1_set_message_header(s, (void *)s->init_buf->data,
1395 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1396
1397 /* buffer the message to handle re-xmits */
1398 dtls1_buffer_message(s, 0);
1399
1400 s->state = SSL3_ST_SW_CERT_REQ_B;
1401 }
1402
1403 /* SSL3_ST_SW_CERT_REQ_B */
1404 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1405err:
1406 return(-1);
1407 }
1408
1409int dtls1_send_server_certificate(SSL *s)
1410 {
1411 unsigned long l;
1412 X509 *x;
1413
1414 if (s->state == SSL3_ST_SW_CERT_A)
1415 {
1416 x=ssl_get_server_send_cert(s);
1417 if (x == NULL)
1418 {
1419 /* VRS: allow null cert if auth == KRB5 */
1420 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1421 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1422 {
1423 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1424 return(0);
1425 }
1426 }
1427
1428 l=dtls1_output_cert_chain(s,x);
1429 s->state=SSL3_ST_SW_CERT_B;
1430 s->init_num=(int)l;
1431 s->init_off=0;
1432
1433 /* buffer the message to handle re-xmits */
1434 dtls1_buffer_message(s, 0);
1435 }
1436
1437 /* SSL3_ST_SW_CERT_B */
1438 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1439 }
1440
1441#ifndef OPENSSL_NO_TLSEXT
1442int dtls1_send_newsession_ticket(SSL *s)
1443 {
1444 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1445 {
1446 unsigned char *p, *senc, *macstart;
1447 int len, slen;
1448 unsigned int hlen, msg_len;
1449 EVP_CIPHER_CTX ctx;
1450 HMAC_CTX hctx;
1451 SSL_CTX *tctx = s->initial_ctx;
1452 unsigned char iv[EVP_MAX_IV_LENGTH];
1453 unsigned char key_name[16];
1454
1455 /* get session encoding length */
1456 slen = i2d_SSL_SESSION(s->session, NULL);
1457 /* Some length values are 16 bits, so forget it if session is
1458 * too long
1459 */
1460 if (slen > 0xFF00)
1461 return -1;
1462 /* Grow buffer if need be: the length calculation is as
1463 * follows 12 (DTLS handshake message header) +
1464 * 4 (ticket lifetime hint) + 2 (ticket length) +
1465 * 16 (key name) + max_iv_len (iv length) +
1466 * session_length + max_enc_block_size (max encrypted session
1467 * length) + max_md_size (HMAC).
1468 */
1469 if (!BUF_MEM_grow(s->init_buf,
1470 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1471 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1472 return -1;
1473 senc = OPENSSL_malloc(slen);
1474 if (!senc)
1475 return -1;
1476 p = senc;
1477 i2d_SSL_SESSION(s->session, &p);
1478
1479 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1480 EVP_CIPHER_CTX_init(&ctx);
1481 HMAC_CTX_init(&hctx);
1482 /* Initialize HMAC and cipher contexts. If callback present
1483 * it does all the work otherwise use generated values
1484 * from parent ctx.
1485 */
1486 if (tctx->tlsext_ticket_key_cb)
1487 {
1488 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1489 &hctx, 1) < 0)
1490 {
1491 OPENSSL_free(senc);
1492 return -1;
1493 }
1494 }
1495 else
1496 {
1497 RAND_pseudo_bytes(iv, 16);
1498 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1499 tctx->tlsext_tick_aes_key, iv);
1500 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1501 tlsext_tick_md(), NULL);
1502 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1503 }
1504 l2n(s->session->tlsext_tick_lifetime_hint, p);
1505 /* Skip ticket length for now */
1506 p += 2;
1507 /* Output key name */
1508 macstart = p;
1509 memcpy(p, key_name, 16);
1510 p += 16;
1511 /* output IV */
1512 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1513 p += EVP_CIPHER_CTX_iv_length(&ctx);
1514 /* Encrypt session data */
1515 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1516 p += len;
1517 EVP_EncryptFinal(&ctx, p, &len);
1518 p += len;
1519 EVP_CIPHER_CTX_cleanup(&ctx);
1520
1521 HMAC_Update(&hctx, macstart, p - macstart);
1522 HMAC_Final(&hctx, p, &hlen);
1523 HMAC_CTX_cleanup(&hctx);
1524
1525 p += hlen;
1526 /* Now write out lengths: p points to end of data written */
1527 /* Total length */
1528 len = p - (unsigned char *)(s->init_buf->data);
1529 /* Ticket length */
1530 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1531 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1532
1533 /* number of bytes to write */
1534 s->init_num= len;
1535 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1536 s->init_off=0;
1537 OPENSSL_free(senc);
1538
1539 /* XDTLS: set message header ? */
1540 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1541 dtls1_set_message_header(s, (void *)s->init_buf->data,
1542 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1543
1544 /* buffer the message to handle re-xmits */
1545 dtls1_buffer_message(s, 0);
1546 }
1547
1548 /* SSL3_ST_SW_SESSION_TICKET_B */
1549 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1550 }
1551#endif
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-26 21:52:11 +0000