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[thirdparty/openssl.git] / ssl / d1_srvr.c
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
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
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 long num1;
151 unsigned long alg_k;
152 int ret= -1;
153 int new_state,state,skip=0;
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 /* init things to blank */
165 s->in_handshake++;
166 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
167
168 if (s->cert == NULL)
169 {
170 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
171 return(-1);
172 }
173
174 for (;;)
175 {
176 state=s->state;
177
178 switch (s->state)
179 {
180 case SSL_ST_RENEGOTIATE:
181 s->new_session=1;
182 /* s->state=SSL_ST_ACCEPT; */
183
184 case SSL_ST_BEFORE:
185 case SSL_ST_ACCEPT:
186 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
187 case SSL_ST_OK|SSL_ST_ACCEPT:
188
189 s->server=1;
190 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
191
192 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
193 {
194 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
195 return -1;
196 }
197 s->type=SSL_ST_ACCEPT;
198
199 if (s->init_buf == NULL)
200 {
201 if ((buf=BUF_MEM_new()) == NULL)
202 {
203 ret= -1;
204 goto end;
205 }
206 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
207 {
208 ret= -1;
209 goto end;
210 }
211 s->init_buf=buf;
212 }
213
214 if (!ssl3_setup_buffers(s))
215 {
216 ret= -1;
217 goto end;
218 }
219
220 s->init_num=0;
221
222 if (s->state != SSL_ST_RENEGOTIATE)
223 {
224 /* Ok, we now need to push on a buffering BIO so that
225 * the output is sent in a way that TCP likes :-)
226 */
227 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
228
229 ssl3_init_finished_mac(s);
230 s->state=SSL3_ST_SR_CLNT_HELLO_A;
231 s->ctx->stats.sess_accept++;
232 }
233 else
234 {
235 /* s->state == SSL_ST_RENEGOTIATE,
236 * we will just send a HelloRequest */
237 s->ctx->stats.sess_accept_renegotiate++;
238 s->state=SSL3_ST_SW_HELLO_REQ_A;
239 }
240
241 break;
242
243 case SSL3_ST_SW_HELLO_REQ_A:
244 case SSL3_ST_SW_HELLO_REQ_B:
245
246 s->shutdown=0;
247 dtls1_start_timer(s);
248 ret=dtls1_send_hello_request(s);
249 if (ret <= 0) goto end;
250 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
251 s->state=SSL3_ST_SW_FLUSH;
252 s->init_num=0;
253
254 ssl3_init_finished_mac(s);
255 break;
256
257 case SSL3_ST_SW_HELLO_REQ_C:
258 s->state=SSL_ST_OK;
259 break;
260
261 case SSL3_ST_SR_CLNT_HELLO_A:
262 case SSL3_ST_SR_CLNT_HELLO_B:
263 case SSL3_ST_SR_CLNT_HELLO_C:
264
265 s->shutdown=0;
266 ret=ssl3_get_client_hello(s);
267 if (ret <= 0) goto end;
268 dtls1_stop_timer(s);
269 s->new_session = 2;
270
271 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
272 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
273 else
274 s->state = SSL3_ST_SW_SRVR_HELLO_A;
275
276 s->init_num=0;
277
278 /* If we're just listening, stop here */
279 if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
280 {
281 ret = 2;
282 s->d1->listen = 0;
283 goto end;
284 }
285
286 break;
287
288 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
289 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
290
291 dtls1_start_timer(s);
292 ret = dtls1_send_hello_verify_request(s);
293 if ( ret <= 0) goto end;
294 s->state=SSL3_ST_SW_FLUSH;
295 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
296
297 /* HelloVerifyRequest resets Finished MAC */
298 if (s->version != DTLS1_BAD_VER)
299 ssl3_init_finished_mac(s);
300 break;
301
302 case SSL3_ST_SW_SRVR_HELLO_A:
303 case SSL3_ST_SW_SRVR_HELLO_B:
304 dtls1_start_timer(s);
305 ret=dtls1_send_server_hello(s);
306 if (ret <= 0) goto end;
307
308 #ifndef OPENSSL_NO_TLSEXT
309 if (s->hit)
310 {
311 if (s->tlsext_ticket_expected)
312 s->state=SSL3_ST_SW_SESSION_TICKET_A;
313 else
314 s->state=SSL3_ST_SW_CHANGE_A;
315 }
316 #else
317 if (s->hit)
318 s->state=SSL3_ST_SW_CHANGE_A;
319 #endif
320 else
321 s->state=SSL3_ST_SW_CERT_A;
322 s->init_num=0;
323 break;
324
325 case SSL3_ST_SW_CERT_A:
326 case SSL3_ST_SW_CERT_B:
327 /* Check if it is anon DH or normal PSK */
328 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
329 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
330 {
331 dtls1_start_timer(s);
332 ret=dtls1_send_server_certificate(s);
333 if (ret <= 0) goto end;
334 #ifndef OPENSSL_NO_TLSEXT
335 if (s->tlsext_status_expected)
336 s->state=SSL3_ST_SW_CERT_STATUS_A;
337 else
338 s->state=SSL3_ST_SW_KEY_EXCH_A;
339 }
340 else
341 {
342 skip = 1;
343 s->state=SSL3_ST_SW_KEY_EXCH_A;
344 }
345 #else
346 }
347 else
348 skip=1;
349
350 s->state=SSL3_ST_SW_KEY_EXCH_A;
351 #endif
352 s->init_num=0;
353 break;
354
355 case SSL3_ST_SW_KEY_EXCH_A:
356 case SSL3_ST_SW_KEY_EXCH_B:
357 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
358
359 /* clear this, it may get reset by
360 * send_server_key_exchange */
361 if ((s->options & SSL_OP_EPHEMERAL_RSA)
362 #ifndef OPENSSL_NO_KRB5
363 && !(alg_k & SSL_kKRB5)
364 #endif /* OPENSSL_NO_KRB5 */
365 )
366 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
367 * even when forbidden by protocol specs
368 * (handshake may fail as clients are not required to
369 * be able to handle this) */
370 s->s3->tmp.use_rsa_tmp=1;
371 else
372 s->s3->tmp.use_rsa_tmp=0;
373
374 /* only send if a DH key exchange or
375 * RSA but we have a sign only certificate */
376 if (s->s3->tmp.use_rsa_tmp
377 /* PSK: send ServerKeyExchange if PSK identity
378 * hint if provided */
379 #ifndef OPENSSL_NO_PSK
380 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
381 #endif
382 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
383 || (alg_k & SSL_kEECDH)
384 || ((alg_k & SSL_kRSA)
385 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
386 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
387 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
388 )
389 )
390 )
391 )
392 {
393 dtls1_start_timer(s);
394 ret=dtls1_send_server_key_exchange(s);
395 if (ret <= 0) goto end;
396 }
397 else
398 skip=1;
399
400 s->state=SSL3_ST_SW_CERT_REQ_A;
401 s->init_num=0;
402 break;
403
404 case SSL3_ST_SW_CERT_REQ_A:
405 case SSL3_ST_SW_CERT_REQ_B:
406 if (/* don't request cert unless asked for it: */
407 !(s->verify_mode & SSL_VERIFY_PEER) ||
408 /* if SSL_VERIFY_CLIENT_ONCE is set,
409 * don't request cert during re-negotiation: */
410 ((s->session->peer != NULL) &&
411 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
412 /* never request cert in anonymous ciphersuites
413 * (see section "Certificate request" in SSL 3 drafts
414 * and in RFC 2246): */
415 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
416 /* ... except when the application insists on verification
417 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
418 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
419 /* never request cert in Kerberos ciphersuites */
420 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
421 /* With normal PSK Certificates and
422 * Certificate Requests are omitted */
423 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
424 {
425 /* no cert request */
426 skip=1;
427 s->s3->tmp.cert_request=0;
428 s->state=SSL3_ST_SW_SRVR_DONE_A;
429 }
430 else
431 {
432 s->s3->tmp.cert_request=1;
433 dtls1_start_timer(s);
434 ret=dtls1_send_certificate_request(s);
435 if (ret <= 0) goto end;
436 #ifndef NETSCAPE_HANG_BUG
437 s->state=SSL3_ST_SW_SRVR_DONE_A;
438 #else
439 s->state=SSL3_ST_SW_FLUSH;
440 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
441 #endif
442 s->init_num=0;
443 }
444 break;
445
446 case SSL3_ST_SW_SRVR_DONE_A:
447 case SSL3_ST_SW_SRVR_DONE_B:
448 dtls1_start_timer(s);
449 ret=dtls1_send_server_done(s);
450 if (ret <= 0) goto end;
451 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
452 s->state=SSL3_ST_SW_FLUSH;
453 s->init_num=0;
454 break;
455
456 case SSL3_ST_SW_FLUSH:
457 /* number of bytes to be flushed */
458 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
459 if (num1 > 0)
460 {
461 s->rwstate=SSL_WRITING;
462 num1=BIO_flush(s->wbio);
463 if (num1 <= 0) { ret= -1; goto end; }
464 s->rwstate=SSL_NOTHING;
465 }
466
467 s->state=s->s3->tmp.next_state;
468 break;
469
470 case SSL3_ST_SR_CERT_A:
471 case SSL3_ST_SR_CERT_B:
472 /* Check for second client hello (MS SGC) */
473 ret = ssl3_check_client_hello(s);
474 if (ret <= 0)
475 goto end;
476 dtls1_stop_timer(s);
477 if (ret == 2)
478 s->state = SSL3_ST_SR_CLNT_HELLO_C;
479 else {
480 /* could be sent for a DH cert, even if we
481 * have not asked for it :-) */
482 ret=ssl3_get_client_certificate(s);
483 if (ret <= 0) goto end;
484 dtls1_stop_timer(s);
485 s->init_num=0;
486 s->state=SSL3_ST_SR_KEY_EXCH_A;
487 }
488 break;
489
490 case SSL3_ST_SR_KEY_EXCH_A:
491 case SSL3_ST_SR_KEY_EXCH_B:
492 ret=ssl3_get_client_key_exchange(s);
493 if (ret <= 0) goto end;
494 dtls1_stop_timer(s);
495 s->state=SSL3_ST_SR_CERT_VRFY_A;
496 s->init_num=0;
497
498 if (ret == 2)
499 {
500 /* For the ECDH ciphersuites when
501 * the client sends its ECDH pub key in
502 * a certificate, the CertificateVerify
503 * message is not sent.
504 */
505 s->state=SSL3_ST_SR_FINISHED_A;
506 s->init_num = 0;
507 }
508 else
509 {
510 s->state=SSL3_ST_SR_CERT_VRFY_A;
511 s->init_num=0;
512
513 /* We need to get hashes here so if there is
514 * a client cert, it can be verified */
515 s->method->ssl3_enc->cert_verify_mac(s,
516 NID_md5,
517 &(s->s3->tmp.cert_verify_md[0]));
518 s->method->ssl3_enc->cert_verify_mac(s,
519 NID_sha1,
520 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
521 }
522 break;
523
524 case SSL3_ST_SR_CERT_VRFY_A:
525 case SSL3_ST_SR_CERT_VRFY_B:
526
527 s->d1->change_cipher_spec_ok = 1;
528 /* we should decide if we expected this one */
529 ret=ssl3_get_cert_verify(s);
530 if (ret <= 0) goto end;
531 dtls1_stop_timer(s);
532
533 s->state=SSL3_ST_SR_FINISHED_A;
534 s->init_num=0;
535 break;
536
537 case SSL3_ST_SR_FINISHED_A:
538 case SSL3_ST_SR_FINISHED_B:
539 s->d1->change_cipher_spec_ok = 1;
540 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
541 SSL3_ST_SR_FINISHED_B);
542 if (ret <= 0) goto end;
543 dtls1_stop_timer(s);
544 if (s->hit)
545 s->state=SSL_ST_OK;
546 #ifndef OPENSSL_NO_TLSEXT
547 else if (s->tlsext_ticket_expected)
548 s->state=SSL3_ST_SW_SESSION_TICKET_A;
549 #endif
550 else
551 s->state=SSL3_ST_SW_CHANGE_A;
552 s->init_num=0;
553 break;
554
555 #ifndef OPENSSL_NO_TLSEXT
556 case SSL3_ST_SW_SESSION_TICKET_A:
557 case SSL3_ST_SW_SESSION_TICKET_B:
558 ret=dtls1_send_newsession_ticket(s);
559 if (ret <= 0) goto end;
560 s->state=SSL3_ST_SW_CHANGE_A;
561 s->init_num=0;
562 break;
563
564 case SSL3_ST_SW_CERT_STATUS_A:
565 case SSL3_ST_SW_CERT_STATUS_B:
566 ret=ssl3_send_cert_status(s);
567 if (ret <= 0) goto end;
568 s->state=SSL3_ST_SW_KEY_EXCH_A;
569 s->init_num=0;
570 break;
571
572 #endif
573
574 case SSL3_ST_SW_CHANGE_A:
575 case SSL3_ST_SW_CHANGE_B:
576
577 s->session->cipher=s->s3->tmp.new_cipher;
578 if (!s->method->ssl3_enc->setup_key_block(s))
579 { ret= -1; goto end; }
580
581 ret=dtls1_send_change_cipher_spec(s,
582 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
583
584 if (ret <= 0) goto end;
585 s->state=SSL3_ST_SW_FINISHED_A;
586 s->init_num=0;
587
588 if (!s->method->ssl3_enc->change_cipher_state(s,
589 SSL3_CHANGE_CIPHER_SERVER_WRITE))
590 {
591 ret= -1;
592 goto end;
593 }
594
595 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
596 break;
597
598 case SSL3_ST_SW_FINISHED_A:
599 case SSL3_ST_SW_FINISHED_B:
600 ret=dtls1_send_finished(s,
601 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
602 s->method->ssl3_enc->server_finished_label,
603 s->method->ssl3_enc->server_finished_label_len);
604 if (ret <= 0) goto end;
605 s->state=SSL3_ST_SW_FLUSH;
606 if (s->hit)
607 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
608 else
609 s->s3->tmp.next_state=SSL_ST_OK;
610 s->init_num=0;
611 break;
612
613 case SSL_ST_OK:
614 /* clean a few things up */
615 ssl3_cleanup_key_block(s);
616
617 #if 0
618 BUF_MEM_free(s->init_buf);
619 s->init_buf=NULL;
620 #endif
621
622 /* remove buffering on output */
623 ssl_free_wbio_buffer(s);
624
625 s->init_num=0;
626
627 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
628 {
629 /* actually not necessarily a 'new' session unless
630 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
631
632 s->new_session=0;
633
634 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
635
636 s->ctx->stats.sess_accept_good++;
637 /* s->server=1; */
638 s->handshake_func=dtls1_accept;
639
640 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
641 }
642
643 ret = 1;
644
645 /* done handshaking, next message is client hello */
646 s->d1->handshake_read_seq = 0;
647 /* next message is server hello */
648 s->d1->handshake_write_seq = 0;
649 s->d1->next_handshake_write_seq = 0;
650 goto end;
651 /* break; */
652
653 default:
654 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
655 ret= -1;
656 goto end;
657 /* break; */
658 }
659
660 if (!s->s3->tmp.reuse_message && !skip)
661 {
662 if (s->debug)
663 {
664 if ((ret=BIO_flush(s->wbio)) <= 0)
665 goto end;
666 }
667
668
669 if ((cb != NULL) && (s->state != state))
670 {
671 new_state=s->state;
672 s->state=state;
673 cb(s,SSL_CB_ACCEPT_LOOP,1);
674 s->state=new_state;
675 }
676 }
677 skip=0;
678 }
679 end:
680 /* BIO_flush(s->wbio); */
681
682 s->in_handshake--;
683 if (cb != NULL)
684 cb(s,SSL_CB_ACCEPT_EXIT,ret);
685 return(ret);
686 }
687
688 int dtls1_send_hello_request(SSL *s)
689 {
690 unsigned char *p;
691
692 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
693 {
694 p=(unsigned char *)s->init_buf->data;
695 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
696
697 s->state=SSL3_ST_SW_HELLO_REQ_B;
698 /* number of bytes to write */
699 s->init_num=DTLS1_HM_HEADER_LENGTH;
700 s->init_off=0;
701
702 /* no need to buffer this message, since there are no retransmit
703 * requests for it */
704 }
705
706 /* SSL3_ST_SW_HELLO_REQ_B */
707 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
708 }
709
710 int dtls1_send_hello_verify_request(SSL *s)
711 {
712 unsigned int msg_len;
713 unsigned char *msg, *buf, *p;
714
715 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
716 {
717 buf = (unsigned char *)s->init_buf->data;
718
719 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
720 *(p++) = s->version >> 8;
721 *(p++) = s->version & 0xFF;
722
723 if (s->ctx->app_gen_cookie_cb == NULL ||
724 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
725 &(s->d1->cookie_len)) == 0)
726 {
727 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
728 return 0;
729 }
730
731 *(p++) = (unsigned char) s->d1->cookie_len;
732 memcpy(p, s->d1->cookie, s->d1->cookie_len);
733 p += s->d1->cookie_len;
734 msg_len = p - msg;
735
736 dtls1_set_message_header(s, buf,
737 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
738
739 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
740 /* number of bytes to write */
741 s->init_num=p-buf;
742 s->init_off=0;
743
744 /* buffer the message to handle re-xmits */
745 dtls1_buffer_message(s, 0);
746 }
747
748 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
749 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
750 }
751
752 int dtls1_send_server_hello(SSL *s)
753 {
754 unsigned char *buf;
755 unsigned char *p,*d;
756 int i;
757 unsigned int sl;
758 unsigned long l,Time;
759
760 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
761 {
762 buf=(unsigned char *)s->init_buf->data;
763 p=s->s3->server_random;
764 Time=(unsigned long)time(NULL); /* Time */
765 l2n(Time,p);
766 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
767 /* Do the message type and length last */
768 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
769
770 *(p++)=s->version>>8;
771 *(p++)=s->version&0xff;
772
773 /* Random stuff */
774 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
775 p+=SSL3_RANDOM_SIZE;
776
777 /* now in theory we have 3 options to sending back the
778 * session id. If it is a re-use, we send back the
779 * old session-id, if it is a new session, we send
780 * back the new session-id or we send back a 0 length
781 * session-id if we want it to be single use.
782 * Currently I will not implement the '0' length session-id
783 * 12-Jan-98 - I'll now support the '0' length stuff.
784 */
785 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
786 s->session->session_id_length=0;
787
788 sl=s->session->session_id_length;
789 if (sl > sizeof s->session->session_id)
790 {
791 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
792 return -1;
793 }
794 *(p++)=sl;
795 memcpy(p,s->session->session_id,sl);
796 p+=sl;
797
798 /* put the cipher */
799 if (s->s3->tmp.new_cipher == NULL)
800 return -1;
801 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
802 p+=i;
803
804 /* put the compression method */
805 #ifdef OPENSSL_NO_COMP
806 *(p++)=0;
807 #else
808 if (s->s3->tmp.new_compression == NULL)
809 *(p++)=0;
810 else
811 *(p++)=s->s3->tmp.new_compression->id;
812 #endif
813
814 #ifndef OPENSSL_NO_TLSEXT
815 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
816 {
817 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
818 return -1;
819 }
820 #endif
821
822 /* do the header */
823 l=(p-d);
824 d=buf;
825
826 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
827
828 s->state=SSL3_ST_SW_SRVR_HELLO_B;
829 /* number of bytes to write */
830 s->init_num=p-buf;
831 s->init_off=0;
832
833 /* buffer the message to handle re-xmits */
834 dtls1_buffer_message(s, 0);
835 }
836
837 /* SSL3_ST_SW_SRVR_HELLO_B */
838 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
839 }
840
841 int dtls1_send_server_done(SSL *s)
842 {
843 unsigned char *p;
844
845 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
846 {
847 p=(unsigned char *)s->init_buf->data;
848
849 /* do the header */
850 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
851
852 s->state=SSL3_ST_SW_SRVR_DONE_B;
853 /* number of bytes to write */
854 s->init_num=DTLS1_HM_HEADER_LENGTH;
855 s->init_off=0;
856
857 /* buffer the message to handle re-xmits */
858 dtls1_buffer_message(s, 0);
859 }
860
861 /* SSL3_ST_SW_SRVR_DONE_B */
862 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
863 }
864
865 int dtls1_send_server_key_exchange(SSL *s)
866 {
867 #ifndef OPENSSL_NO_RSA
868 unsigned char *q;
869 int j,num;
870 RSA *rsa;
871 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
872 unsigned int u;
873 #endif
874 #ifndef OPENSSL_NO_DH
875 DH *dh=NULL,*dhp;
876 #endif
877 #ifndef OPENSSL_NO_ECDH
878 EC_KEY *ecdh=NULL, *ecdhp;
879 unsigned char *encodedPoint = NULL;
880 int encodedlen = 0;
881 int curve_id = 0;
882 BN_CTX *bn_ctx = NULL;
883 #endif
884 EVP_PKEY *pkey;
885 unsigned char *p,*d;
886 int al,i;
887 unsigned long type;
888 int n;
889 CERT *cert;
890 BIGNUM *r[4];
891 int nr[4],kn;
892 BUF_MEM *buf;
893 EVP_MD_CTX md_ctx;
894
895 EVP_MD_CTX_init(&md_ctx);
896 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
897 {
898 type=s->s3->tmp.new_cipher->algorithm_mkey;
899 cert=s->cert;
900
901 buf=s->init_buf;
902
903 r[0]=r[1]=r[2]=r[3]=NULL;
904 n=0;
905 #ifndef OPENSSL_NO_RSA
906 if (type & SSL_kRSA)
907 {
908 rsa=cert->rsa_tmp;
909 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
910 {
911 rsa=s->cert->rsa_tmp_cb(s,
912 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
913 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
914 if(rsa == NULL)
915 {
916 al=SSL_AD_HANDSHAKE_FAILURE;
917 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
918 goto f_err;
919 }
920 RSA_up_ref(rsa);
921 cert->rsa_tmp=rsa;
922 }
923 if (rsa == NULL)
924 {
925 al=SSL_AD_HANDSHAKE_FAILURE;
926 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
927 goto f_err;
928 }
929 r[0]=rsa->n;
930 r[1]=rsa->e;
931 s->s3->tmp.use_rsa_tmp=1;
932 }
933 else
934 #endif
935 #ifndef OPENSSL_NO_DH
936 if (type & SSL_kEDH)
937 {
938 dhp=cert->dh_tmp;
939 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
940 dhp=s->cert->dh_tmp_cb(s,
941 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
942 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
943 if (dhp == NULL)
944 {
945 al=SSL_AD_HANDSHAKE_FAILURE;
946 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
947 goto f_err;
948 }
949
950 if (s->s3->tmp.dh != NULL)
951 {
952 DH_free(dh);
953 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
954 goto err;
955 }
956
957 if ((dh=DHparams_dup(dhp)) == NULL)
958 {
959 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
960 goto err;
961 }
962
963 s->s3->tmp.dh=dh;
964 if ((dhp->pub_key == NULL ||
965 dhp->priv_key == NULL ||
966 (s->options & SSL_OP_SINGLE_DH_USE)))
967 {
968 if(!DH_generate_key(dh))
969 {
970 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
971 ERR_R_DH_LIB);
972 goto err;
973 }
974 }
975 else
976 {
977 dh->pub_key=BN_dup(dhp->pub_key);
978 dh->priv_key=BN_dup(dhp->priv_key);
979 if ((dh->pub_key == NULL) ||
980 (dh->priv_key == NULL))
981 {
982 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
983 goto err;
984 }
985 }
986 r[0]=dh->p;
987 r[1]=dh->g;
988 r[2]=dh->pub_key;
989 }
990 else
991 #endif
992 #ifndef OPENSSL_NO_ECDH
993 if (type & SSL_kEECDH)
994 {
995 const EC_GROUP *group;
996
997 ecdhp=cert->ecdh_tmp;
998 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
999 {
1000 ecdhp=s->cert->ecdh_tmp_cb(s,
1001 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1002 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1003 }
1004 if (ecdhp == NULL)
1005 {
1006 al=SSL_AD_HANDSHAKE_FAILURE;
1007 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1008 goto f_err;
1009 }
1010
1011 if (s->s3->tmp.ecdh != NULL)
1012 {
1013 EC_KEY_free(s->s3->tmp.ecdh);
1014 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1015 goto err;
1016 }
1017
1018 /* Duplicate the ECDH structure. */
1019 if (ecdhp == NULL)
1020 {
1021 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1022 goto err;
1023 }
1024 if (!EC_KEY_up_ref(ecdhp))
1025 {
1026 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1027 goto err;
1028 }
1029 ecdh = ecdhp;
1030
1031 s->s3->tmp.ecdh=ecdh;
1032 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1033 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1034 (s->options & SSL_OP_SINGLE_ECDH_USE))
1035 {
1036 if(!EC_KEY_generate_key(ecdh))
1037 {
1038 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1039 goto err;
1040 }
1041 }
1042
1043 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1044 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1045 (EC_KEY_get0_private_key(ecdh) == NULL))
1046 {
1047 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1048 goto err;
1049 }
1050
1051 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1052 (EC_GROUP_get_degree(group) > 163))
1053 {
1054 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1055 goto err;
1056 }
1057
1058 /* XXX: For now, we only support ephemeral ECDH
1059 * keys over named (not generic) curves. For
1060 * supported named curves, curve_id is non-zero.
1061 */
1062 if ((curve_id =
1063 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1064 == 0)
1065 {
1066 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1067 goto err;
1068 }
1069
1070 /* Encode the public key.
1071 * First check the size of encoding and
1072 * allocate memory accordingly.
1073 */
1074 encodedlen = EC_POINT_point2oct(group,
1075 EC_KEY_get0_public_key(ecdh),
1076 POINT_CONVERSION_UNCOMPRESSED,
1077 NULL, 0, NULL);
1078
1079 encodedPoint = (unsigned char *)
1080 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1081 bn_ctx = BN_CTX_new();
1082 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1083 {
1084 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1085 goto err;
1086 }
1087
1088
1089 encodedlen = EC_POINT_point2oct(group,
1090 EC_KEY_get0_public_key(ecdh),
1091 POINT_CONVERSION_UNCOMPRESSED,
1092 encodedPoint, encodedlen, bn_ctx);
1093
1094 if (encodedlen == 0)
1095 {
1096 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1097 goto err;
1098 }
1099
1100 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1101
1102 /* XXX: For now, we only support named (not
1103 * generic) curves in ECDH ephemeral key exchanges.
1104 * In this situation, we need four additional bytes
1105 * to encode the entire ServerECDHParams
1106 * structure.
1107 */
1108 n = 4 + encodedlen;
1109
1110 /* We'll generate the serverKeyExchange message
1111 * explicitly so we can set these to NULLs
1112 */
1113 r[0]=NULL;
1114 r[1]=NULL;
1115 r[2]=NULL;
1116 r[3]=NULL;
1117 }
1118 else
1119 #endif /* !OPENSSL_NO_ECDH */
1120 #ifndef OPENSSL_NO_PSK
1121 if (type & SSL_kPSK)
1122 {
1123 /* reserve size for record length and PSK identity hint*/
1124 n+=2+strlen(s->ctx->psk_identity_hint);
1125 }
1126 else
1127 #endif /* !OPENSSL_NO_PSK */
1128 {
1129 al=SSL_AD_HANDSHAKE_FAILURE;
1130 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1131 goto f_err;
1132 }
1133 for (i=0; r[i] != NULL; i++)
1134 {
1135 nr[i]=BN_num_bytes(r[i]);
1136 n+=2+nr[i];
1137 }
1138
1139 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1140 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1141 {
1142 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1143 == NULL)
1144 {
1145 al=SSL_AD_DECODE_ERROR;
1146 goto f_err;
1147 }
1148 kn=EVP_PKEY_size(pkey);
1149 }
1150 else
1151 {
1152 pkey=NULL;
1153 kn=0;
1154 }
1155
1156 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1157 {
1158 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1159 goto err;
1160 }
1161 d=(unsigned char *)s->init_buf->data;
1162 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1163
1164 for (i=0; r[i] != NULL; i++)
1165 {
1166 s2n(nr[i],p);
1167 BN_bn2bin(r[i],p);
1168 p+=nr[i];
1169 }
1170
1171 #ifndef OPENSSL_NO_ECDH
1172 if (type & SSL_kEECDH)
1173 {
1174 /* XXX: For now, we only support named (not generic) curves.
1175 * In this situation, the serverKeyExchange message has:
1176 * [1 byte CurveType], [2 byte CurveName]
1177 * [1 byte length of encoded point], followed by
1178 * the actual encoded point itself
1179 */
1180 *p = NAMED_CURVE_TYPE;
1181 p += 1;
1182 *p = 0;
1183 p += 1;
1184 *p = curve_id;
1185 p += 1;
1186 *p = encodedlen;
1187 p += 1;
1188 memcpy((unsigned char*)p,
1189 (unsigned char *)encodedPoint,
1190 encodedlen);
1191 OPENSSL_free(encodedPoint);
1192 p += encodedlen;
1193 }
1194 #endif
1195
1196 #ifndef OPENSSL_NO_PSK
1197 if (type & SSL_kPSK)
1198 {
1199 /* copy PSK identity hint */
1200 s2n(strlen(s->ctx->psk_identity_hint), p);
1201 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1202 p+=strlen(s->ctx->psk_identity_hint);
1203 }
1204 #endif
1205
1206 /* not anonymous */
1207 if (pkey != NULL)
1208 {
1209 /* n is the length of the params, they start at
1210 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1211 * at the end. */
1212 #ifndef OPENSSL_NO_RSA
1213 if (pkey->type == EVP_PKEY_RSA)
1214 {
1215 q=md_buf;
1216 j=0;
1217 for (num=2; num > 0; num--)
1218 {
1219 EVP_DigestInit_ex(&md_ctx,(num == 2)
1220 ?s->ctx->md5:s->ctx->sha1, NULL);
1221 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1222 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1223 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1224 EVP_DigestFinal_ex(&md_ctx,q,
1225 (unsigned int *)&i);
1226 q+=i;
1227 j+=i;
1228 }
1229 if (RSA_sign(NID_md5_sha1, md_buf, j,
1230 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1231 {
1232 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1233 goto err;
1234 }
1235 s2n(u,p);
1236 n+=u+2;
1237 }
1238 else
1239 #endif
1240 #if !defined(OPENSSL_NO_DSA)
1241 if (pkey->type == EVP_PKEY_DSA)
1242 {
1243 /* lets do DSS */
1244 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1245 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1246 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1247 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1248 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1249 (unsigned int *)&i,pkey))
1250 {
1251 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1252 goto err;
1253 }
1254 s2n(i,p);
1255 n+=i+2;
1256 }
1257 else
1258 #endif
1259 #if !defined(OPENSSL_NO_ECDSA)
1260 if (pkey->type == EVP_PKEY_EC)
1261 {
1262 /* let's do ECDSA */
1263 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1264 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1265 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1266 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1267 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1268 (unsigned int *)&i,pkey))
1269 {
1270 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1271 goto err;
1272 }
1273 s2n(i,p);
1274 n+=i+2;
1275 }
1276 else
1277 #endif
1278 {
1279 /* Is this error check actually needed? */
1280 al=SSL_AD_HANDSHAKE_FAILURE;
1281 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1282 goto f_err;
1283 }
1284 }
1285
1286 d = dtls1_set_message_header(s, d,
1287 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1288
1289 /* we should now have things packed up, so lets send
1290 * it off */
1291 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1292 s->init_off=0;
1293
1294 /* buffer the message to handle re-xmits */
1295 dtls1_buffer_message(s, 0);
1296 }
1297
1298 s->state = SSL3_ST_SW_KEY_EXCH_B;
1299 EVP_MD_CTX_cleanup(&md_ctx);
1300 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1301 f_err:
1302 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1303 err:
1304 #ifndef OPENSSL_NO_ECDH
1305 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1306 BN_CTX_free(bn_ctx);
1307 #endif
1308 EVP_MD_CTX_cleanup(&md_ctx);
1309 return(-1);
1310 }
1311
1312 int dtls1_send_certificate_request(SSL *s)
1313 {
1314 unsigned char *p,*d;
1315 int i,j,nl,off,n;
1316 STACK_OF(X509_NAME) *sk=NULL;
1317 X509_NAME *name;
1318 BUF_MEM *buf;
1319 unsigned int msg_len;
1320
1321 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1322 {
1323 buf=s->init_buf;
1324
1325 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1326
1327 /* get the list of acceptable cert types */
1328 p++;
1329 n=ssl3_get_req_cert_type(s,p);
1330 d[0]=n;
1331 p+=n;
1332 n++;
1333
1334 off=n;
1335 p+=2;
1336 n+=2;
1337
1338 sk=SSL_get_client_CA_list(s);
1339 nl=0;
1340 if (sk != NULL)
1341 {
1342 for (i=0; i<sk_X509_NAME_num(sk); i++)
1343 {
1344 name=sk_X509_NAME_value(sk,i);
1345 j=i2d_X509_NAME(name,NULL);
1346 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1347 {
1348 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1349 goto err;
1350 }
1351 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1352 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1353 {
1354 s2n(j,p);
1355 i2d_X509_NAME(name,&p);
1356 n+=2+j;
1357 nl+=2+j;
1358 }
1359 else
1360 {
1361 d=p;
1362 i2d_X509_NAME(name,&p);
1363 j-=2; s2n(j,d); j+=2;
1364 n+=j;
1365 nl+=j;
1366 }
1367 }
1368 }
1369 /* else no CA names */
1370 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1371 s2n(nl,p);
1372
1373 d=(unsigned char *)buf->data;
1374 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1375 l2n3(n,d);
1376 s2n(s->d1->handshake_write_seq,d);
1377 s->d1->handshake_write_seq++;
1378
1379 /* we should now have things packed up, so lets send
1380 * it off */
1381
1382 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1383 s->init_off=0;
1384 #ifdef NETSCAPE_HANG_BUG
1385 /* XXX: what to do about this? */
1386 p=(unsigned char *)s->init_buf->data + s->init_num;
1387
1388 /* do the header */
1389 *(p++)=SSL3_MT_SERVER_DONE;
1390 *(p++)=0;
1391 *(p++)=0;
1392 *(p++)=0;
1393 s->init_num += 4;
1394 #endif
1395
1396 /* XDTLS: set message header ? */
1397 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1398 dtls1_set_message_header(s, (void *)s->init_buf->data,
1399 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1400
1401 /* buffer the message to handle re-xmits */
1402 dtls1_buffer_message(s, 0);
1403
1404 s->state = SSL3_ST_SW_CERT_REQ_B;
1405 }
1406
1407 /* SSL3_ST_SW_CERT_REQ_B */
1408 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1409 err:
1410 return(-1);
1411 }
1412
1413 int dtls1_send_server_certificate(SSL *s)
1414 {
1415 unsigned long l;
1416 X509 *x;
1417
1418 if (s->state == SSL3_ST_SW_CERT_A)
1419 {
1420 x=ssl_get_server_send_cert(s);
1421 if (x == NULL)
1422 {
1423 /* VRS: allow null cert if auth == KRB5 */
1424 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1425 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1426 {
1427 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1428 return(0);
1429 }
1430 }
1431
1432 l=dtls1_output_cert_chain(s,x);
1433 s->state=SSL3_ST_SW_CERT_B;
1434 s->init_num=(int)l;
1435 s->init_off=0;
1436
1437 /* buffer the message to handle re-xmits */
1438 dtls1_buffer_message(s, 0);
1439 }
1440
1441 /* SSL3_ST_SW_CERT_B */
1442 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1443 }
1444
1445 #ifndef OPENSSL_NO_TLSEXT
1446 int dtls1_send_newsession_ticket(SSL *s)
1447 {
1448 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1449 {
1450 unsigned char *p, *senc, *macstart;
1451 int len, slen;
1452 unsigned int hlen, msg_len;
1453 EVP_CIPHER_CTX ctx;
1454 HMAC_CTX hctx;
1455 SSL_CTX *tctx = s->initial_ctx;
1456 unsigned char iv[EVP_MAX_IV_LENGTH];
1457 unsigned char key_name[16];
1458
1459 /* get session encoding length */
1460 slen = i2d_SSL_SESSION(s->session, NULL);
1461 /* Some length values are 16 bits, so forget it if session is
1462 * too long
1463 */
1464 if (slen > 0xFF00)
1465 return -1;
1466 /* Grow buffer if need be: the length calculation is as
1467 * follows 12 (DTLS handshake message header) +
1468 * 4 (ticket lifetime hint) + 2 (ticket length) +
1469 * 16 (key name) + max_iv_len (iv length) +
1470 * session_length + max_enc_block_size (max encrypted session
1471 * length) + max_md_size (HMAC).
1472 */
1473 if (!BUF_MEM_grow(s->init_buf,
1474 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1475 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1476 return -1;
1477 senc = OPENSSL_malloc(slen);
1478 if (!senc)
1479 return -1;
1480 p = senc;
1481 i2d_SSL_SESSION(s->session, &p);
1482
1483 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1484 EVP_CIPHER_CTX_init(&ctx);
1485 HMAC_CTX_init(&hctx);
1486 /* Initialize HMAC and cipher contexts. If callback present
1487 * it does all the work otherwise use generated values
1488 * from parent ctx.
1489 */
1490 if (tctx->tlsext_ticket_key_cb)
1491 {
1492 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1493 &hctx, 1) < 0)
1494 {
1495 OPENSSL_free(senc);
1496 return -1;
1497 }
1498 }
1499 else
1500 {
1501 RAND_pseudo_bytes(iv, 16);
1502 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1503 tctx->tlsext_tick_aes_key, iv);
1504 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1505 tlsext_tick_md(), NULL);
1506 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1507 }
1508 l2n(s->session->tlsext_tick_lifetime_hint, p);
1509 /* Skip ticket length for now */
1510 p += 2;
1511 /* Output key name */
1512 macstart = p;
1513 memcpy(p, key_name, 16);
1514 p += 16;
1515 /* output IV */
1516 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1517 p += EVP_CIPHER_CTX_iv_length(&ctx);
1518 /* Encrypt session data */
1519 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1520 p += len;
1521 EVP_EncryptFinal(&ctx, p, &len);
1522 p += len;
1523 EVP_CIPHER_CTX_cleanup(&ctx);
1524
1525 HMAC_Update(&hctx, macstart, p - macstart);
1526 HMAC_Final(&hctx, p, &hlen);
1527 HMAC_CTX_cleanup(&hctx);
1528
1529 p += hlen;
1530 /* Now write out lengths: p points to end of data written */
1531 /* Total length */
1532 len = p - (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1533 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1534 s2n(len - 18, p); /* Ticket length */
1535
1536 /* number of bytes to write */
1537 s->init_num= len;
1538 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1539 s->init_off=0;
1540 OPENSSL_free(senc);
1541
1542 /* XDTLS: set message header ? */
1543 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1544 dtls1_set_message_header(s, (void *)s->init_buf->data,
1545 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1546
1547 /* buffer the message to handle re-xmits */
1548 dtls1_buffer_message(s, 0);
1549 }
1550
1551 /* SSL3_ST_SW_SESSION_TICKET_B */
1552 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1553 }
1554 #endif
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