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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 int listen;
154#ifndef OPENSSL_NO_SCTP
155 unsigned char sctpauthkey[64];
156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
157#endif
158
159 RAND_add(&Time,sizeof(Time),0);
160 ERR_clear_error();
161 clear_sys_error();
162
163 if (s->info_callback != NULL)
164 cb=s->info_callback;
165 else if (s->ctx->info_callback != NULL)
166 cb=s->ctx->info_callback;
167
168 listen = s->d1->listen;
169
170 /* init things to blank */
171 s->in_handshake++;
172 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
173
174 s->d1->listen = listen;
175#ifndef OPENSSL_NO_SCTP
176 /* Notify SCTP BIO socket to enter handshake
177 * mode and prevent stream identifier other
178 * than 0. Will be ignored if no SCTP is used.
179 */
180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
181#endif
182
183 if (s->cert == NULL)
184 {
185 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
186 return(-1);
187 }
188
189#ifndef OPENSSL_NO_HEARTBEATS
190 /* If we're awaiting a HeartbeatResponse, pretend we
191 * already got and don't await it anymore, because
192 * Heartbeats don't make sense during handshakes anyway.
193 */
194 if (s->tlsext_hb_pending)
195 {
196 dtls1_stop_timer(s);
197 s->tlsext_hb_pending = 0;
198 s->tlsext_hb_seq++;
199 }
200#endif
201
202 for (;;)
203 {
204 state=s->state;
205
206 switch (s->state)
207 {
208 case SSL_ST_RENEGOTIATE:
209 s->renegotiate=1;
210 /* s->state=SSL_ST_ACCEPT; */
211
212 case SSL_ST_BEFORE:
213 case SSL_ST_ACCEPT:
214 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
215 case SSL_ST_OK|SSL_ST_ACCEPT:
216
217 s->server=1;
218 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
219
220 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
221 {
222 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
223 return -1;
224 }
225 s->type=SSL_ST_ACCEPT;
226
227 if (s->init_buf == NULL)
228 {
229 if ((buf=BUF_MEM_new()) == NULL)
230 {
231 ret= -1;
232 goto end;
233 }
234 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
235 {
236 ret= -1;
237 goto end;
238 }
239 s->init_buf=buf;
240 }
241
242 if (!ssl3_setup_buffers(s))
243 {
244 ret= -1;
245 goto end;
246 }
247
248 s->init_num=0;
249
250 if (s->state != SSL_ST_RENEGOTIATE)
251 {
252 /* Ok, we now need to push on a buffering BIO so that
253 * the output is sent in a way that TCP likes :-)
254 * ...but not with SCTP :-)
255 */
256#ifndef OPENSSL_NO_SCTP
257 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
258#endif
259 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
260
261 ssl3_init_finished_mac(s);
262 s->state=SSL3_ST_SR_CLNT_HELLO_A;
263 s->ctx->stats.sess_accept++;
264 }
265 else
266 {
267 /* s->state == SSL_ST_RENEGOTIATE,
268 * we will just send a HelloRequest */
269 s->ctx->stats.sess_accept_renegotiate++;
270 s->state=SSL3_ST_SW_HELLO_REQ_A;
271 }
272
273 break;
274
275 case SSL3_ST_SW_HELLO_REQ_A:
276 case SSL3_ST_SW_HELLO_REQ_B:
277
278 s->shutdown=0;
279 dtls1_start_timer(s);
280 ret=dtls1_send_hello_request(s);
281 if (ret <= 0) goto end;
282 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
283 s->state=SSL3_ST_SW_FLUSH;
284 s->init_num=0;
285
286 ssl3_init_finished_mac(s);
287 break;
288
289 case SSL3_ST_SW_HELLO_REQ_C:
290 s->state=SSL_ST_OK;
291 break;
292
293 case SSL3_ST_SR_CLNT_HELLO_A:
294 case SSL3_ST_SR_CLNT_HELLO_B:
295 case SSL3_ST_SR_CLNT_HELLO_C:
296
297 s->shutdown=0;
298 ret=ssl3_get_client_hello(s);
299 if (ret <= 0) goto end;
300 dtls1_stop_timer(s);
301
302 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
303 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
304 else
305 s->state = SSL3_ST_SW_SRVR_HELLO_A;
306
307 s->init_num=0;
308
309 /* Reflect ClientHello sequence to remain stateless while listening */
310 if (listen)
311 {
312 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
313 }
314
315 /* If we're just listening, stop here */
316 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
317 {
318 ret = 2;
319 s->d1->listen = 0;
320 /* Set expected sequence numbers
321 * to continue the handshake.
322 */
323 s->d1->handshake_read_seq = 2;
324 s->d1->handshake_write_seq = 1;
325 s->d1->next_handshake_write_seq = 1;
326 goto end;
327 }
328
329 break;
330
331 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
333
334 ret = dtls1_send_hello_verify_request(s);
335 if ( ret <= 0) goto end;
336 s->state=SSL3_ST_SW_FLUSH;
337 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
338
339 /* HelloVerifyRequest resets Finished MAC */
340 if (s->version != DTLS1_BAD_VER)
341 ssl3_init_finished_mac(s);
342 break;
343
344#ifndef OPENSSL_NO_SCTP
345 case DTLS1_SCTP_ST_SR_READ_SOCK:
346
347 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
348 {
349 s->s3->in_read_app_data=2;
350 s->rwstate=SSL_READING;
351 BIO_clear_retry_flags(SSL_get_rbio(s));
352 BIO_set_retry_read(SSL_get_rbio(s));
353 ret = -1;
354 goto end;
355 }
356
357 s->state=SSL3_ST_SR_FINISHED_A;
358 break;
359
360 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
361 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
362 if (ret < 0) goto end;
363
364 if (ret == 0)
365 {
366 if (s->d1->next_state != SSL_ST_OK)
367 {
368 s->s3->in_read_app_data=2;
369 s->rwstate=SSL_READING;
370 BIO_clear_retry_flags(SSL_get_rbio(s));
371 BIO_set_retry_read(SSL_get_rbio(s));
372 ret = -1;
373 goto end;
374 }
375 }
376
377 s->state=s->d1->next_state;
378 break;
379#endif
380
381 case SSL3_ST_SW_SRVR_HELLO_A:
382 case SSL3_ST_SW_SRVR_HELLO_B:
383 s->renegotiate = 2;
384 dtls1_start_timer(s);
385 ret=dtls1_send_server_hello(s);
386 if (ret <= 0) goto end;
387
388 if (s->hit)
389 {
390#ifndef OPENSSL_NO_SCTP
391 /* Add new shared key for SCTP-Auth,
392 * will be ignored if no SCTP used.
393 */
394 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
395 DTLS1_SCTP_AUTH_LABEL);
396
397 SSL_export_keying_material(s, sctpauthkey,
398 sizeof(sctpauthkey), labelbuffer,
399 sizeof(labelbuffer), NULL, 0, 0);
400
401 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
402 sizeof(sctpauthkey), sctpauthkey);
403#endif
404#ifndef OPENSSL_NO_TLSEXT
405 if (s->tlsext_ticket_expected)
406 s->state=SSL3_ST_SW_SESSION_TICKET_A;
407 else
408 s->state=SSL3_ST_SW_CHANGE_A;
409#else
410 s->state=SSL3_ST_SW_CHANGE_A;
411#endif
412 }
413 else
414 s->state=SSL3_ST_SW_CERT_A;
415 s->init_num=0;
416 break;
417
418 case SSL3_ST_SW_CERT_A:
419 case SSL3_ST_SW_CERT_B:
420 /* Check if it is anon DH or normal PSK */
421 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
422 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
423 {
424 dtls1_start_timer(s);
425 ret=dtls1_send_server_certificate(s);
426 if (ret <= 0) goto end;
427#ifndef OPENSSL_NO_TLSEXT
428 if (s->tlsext_status_expected)
429 s->state=SSL3_ST_SW_CERT_STATUS_A;
430 else
431 s->state=SSL3_ST_SW_KEY_EXCH_A;
432 }
433 else
434 {
435 skip = 1;
436 s->state=SSL3_ST_SW_KEY_EXCH_A;
437 }
438#else
439 }
440 else
441 skip=1;
442
443 s->state=SSL3_ST_SW_KEY_EXCH_A;
444#endif
445 s->init_num=0;
446 break;
447
448 case SSL3_ST_SW_KEY_EXCH_A:
449 case SSL3_ST_SW_KEY_EXCH_B:
450 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
451
452 /* clear this, it may get reset by
453 * send_server_key_exchange */
454 if ((s->options & SSL_OP_EPHEMERAL_RSA)
455#ifndef OPENSSL_NO_KRB5
456 && !(alg_k & SSL_kKRB5)
457#endif /* OPENSSL_NO_KRB5 */
458 )
459 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
460 * even when forbidden by protocol specs
461 * (handshake may fail as clients are not required to
462 * be able to handle this) */
463 s->s3->tmp.use_rsa_tmp=1;
464 else
465 s->s3->tmp.use_rsa_tmp=0;
466
467 /* only send if a DH key exchange or
468 * RSA but we have a sign only certificate */
469 if (s->s3->tmp.use_rsa_tmp
470 /* PSK: send ServerKeyExchange if PSK identity
471 * hint if provided */
472#ifndef OPENSSL_NO_PSK
473 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
474#endif
475 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
476 || (alg_k & SSL_kEECDH)
477 || ((alg_k & SSL_kRSA)
478 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
479 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
480 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
481 )
482 )
483 )
484 )
485 {
486 dtls1_start_timer(s);
487 ret=dtls1_send_server_key_exchange(s);
488 if (ret <= 0) goto end;
489 }
490 else
491 skip=1;
492
493 s->state=SSL3_ST_SW_CERT_REQ_A;
494 s->init_num=0;
495 break;
496
497 case SSL3_ST_SW_CERT_REQ_A:
498 case SSL3_ST_SW_CERT_REQ_B:
499 if (/* don't request cert unless asked for it: */
500 !(s->verify_mode & SSL_VERIFY_PEER) ||
501 /* if SSL_VERIFY_CLIENT_ONCE is set,
502 * don't request cert during re-negotiation: */
503 ((s->session->peer != NULL) &&
504 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
505 /* never request cert in anonymous ciphersuites
506 * (see section "Certificate request" in SSL 3 drafts
507 * and in RFC 2246): */
508 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
509 /* ... except when the application insists on verification
510 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
511 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
512 /* never request cert in Kerberos ciphersuites */
513 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
514 /* With normal PSK Certificates and
515 * Certificate Requests are omitted */
516 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
517 {
518 /* no cert request */
519 skip=1;
520 s->s3->tmp.cert_request=0;
521 s->state=SSL3_ST_SW_SRVR_DONE_A;
522#ifndef OPENSSL_NO_SCTP
523 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
524 {
525 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
526 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
527 }
528#endif
529 }
530 else
531 {
532 s->s3->tmp.cert_request=1;
533 dtls1_start_timer(s);
534 ret=dtls1_send_certificate_request(s);
535 if (ret <= 0) goto end;
536#ifndef NETSCAPE_HANG_BUG
537 s->state=SSL3_ST_SW_SRVR_DONE_A;
538#ifndef OPENSSL_NO_SCTP
539 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
540 {
541 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
542 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
543 }
544#endif
545#else
546 s->state=SSL3_ST_SW_FLUSH;
547 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
548#ifndef OPENSSL_NO_SCTP
549 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
550 {
551 s->d1->next_state = s->s3->tmp.next_state;
552 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
553 }
554#endif
555#endif
556 s->init_num=0;
557 }
558 break;
559
560 case SSL3_ST_SW_SRVR_DONE_A:
561 case SSL3_ST_SW_SRVR_DONE_B:
562 dtls1_start_timer(s);
563 ret=dtls1_send_server_done(s);
564 if (ret <= 0) goto end;
565 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
566 s->state=SSL3_ST_SW_FLUSH;
567 s->init_num=0;
568 break;
569
570 case SSL3_ST_SW_FLUSH:
571 s->rwstate=SSL_WRITING;
572 if (BIO_flush(s->wbio) <= 0)
573 {
574 /* If the write error was fatal, stop trying */
575 if (!BIO_should_retry(s->wbio))
576 {
577 s->rwstate=SSL_NOTHING;
578 s->state=s->s3->tmp.next_state;
579 }
580
581 ret= -1;
582 goto end;
583 }
584 s->rwstate=SSL_NOTHING;
585 s->state=s->s3->tmp.next_state;
586 break;
587
588 case SSL3_ST_SR_CERT_A:
589 case SSL3_ST_SR_CERT_B:
590 /* Check for second client hello (MS SGC) */
591 ret = ssl3_check_client_hello(s);
592 if (ret <= 0)
593 goto end;
594 if (ret == 2)
595 {
596 dtls1_stop_timer(s);
597 s->state = SSL3_ST_SR_CLNT_HELLO_C;
598 }
599 else {
600 /* could be sent for a DH cert, even if we
601 * have not asked for it :-) */
602 ret=ssl3_get_client_certificate(s);
603 if (ret <= 0) goto end;
604 s->init_num=0;
605 s->state=SSL3_ST_SR_KEY_EXCH_A;
606 }
607 break;
608
609 case SSL3_ST_SR_KEY_EXCH_A:
610 case SSL3_ST_SR_KEY_EXCH_B:
611 ret=ssl3_get_client_key_exchange(s);
612 if (ret <= 0) goto end;
613#ifndef OPENSSL_NO_SCTP
614 /* Add new shared key for SCTP-Auth,
615 * will be ignored if no SCTP used.
616 */
617 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
618 DTLS1_SCTP_AUTH_LABEL);
619
620 SSL_export_keying_material(s, sctpauthkey,
621 sizeof(sctpauthkey), labelbuffer,
622 sizeof(labelbuffer), NULL, 0, 0);
623
624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
625 sizeof(sctpauthkey), sctpauthkey);
626#endif
627
628 s->state=SSL3_ST_SR_CERT_VRFY_A;
629 s->init_num=0;
630
631 if (ret == 2)
632 {
633 /* For the ECDH ciphersuites when
634 * the client sends its ECDH pub key in
635 * a certificate, the CertificateVerify
636 * message is not sent.
637 */
638 s->state=SSL3_ST_SR_FINISHED_A;
639 s->init_num = 0;
640 }
641 else
642 {
643 s->state=SSL3_ST_SR_CERT_VRFY_A;
644 s->init_num=0;
645
646 /* We need to get hashes here so if there is
647 * a client cert, it can be verified */
648 s->method->ssl3_enc->cert_verify_mac(s,
649 NID_md5,
650 &(s->s3->tmp.cert_verify_md[0]));
651 s->method->ssl3_enc->cert_verify_mac(s,
652 NID_sha1,
653 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
654 }
655 break;
656
657 case SSL3_ST_SR_CERT_VRFY_A:
658 case SSL3_ST_SR_CERT_VRFY_B:
659
660 s->d1->change_cipher_spec_ok = 1;
661 /* we should decide if we expected this one */
662 ret=ssl3_get_cert_verify(s);
663 if (ret <= 0) goto end;
664#ifndef OPENSSL_NO_SCTP
665 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
666 state == SSL_ST_RENEGOTIATE)
667 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
668 else
669#endif
670 s->state=SSL3_ST_SR_FINISHED_A;
671 s->init_num=0;
672 break;
673
674 case SSL3_ST_SR_FINISHED_A:
675 case SSL3_ST_SR_FINISHED_B:
676 s->d1->change_cipher_spec_ok = 1;
677 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
678 SSL3_ST_SR_FINISHED_B);
679 if (ret <= 0) goto end;
680 dtls1_stop_timer(s);
681 if (s->hit)
682 s->state=SSL_ST_OK;
683#ifndef OPENSSL_NO_TLSEXT
684 else if (s->tlsext_ticket_expected)
685 s->state=SSL3_ST_SW_SESSION_TICKET_A;
686#endif
687 else
688 s->state=SSL3_ST_SW_CHANGE_A;
689 s->init_num=0;
690 break;
691
692#ifndef OPENSSL_NO_TLSEXT
693 case SSL3_ST_SW_SESSION_TICKET_A:
694 case SSL3_ST_SW_SESSION_TICKET_B:
695 ret=dtls1_send_newsession_ticket(s);
696 if (ret <= 0) goto end;
697 s->state=SSL3_ST_SW_CHANGE_A;
698 s->init_num=0;
699 break;
700
701 case SSL3_ST_SW_CERT_STATUS_A:
702 case SSL3_ST_SW_CERT_STATUS_B:
703 ret=ssl3_send_cert_status(s);
704 if (ret <= 0) goto end;
705 s->state=SSL3_ST_SW_KEY_EXCH_A;
706 s->init_num=0;
707 break;
708
709#endif
710
711 case SSL3_ST_SW_CHANGE_A:
712 case SSL3_ST_SW_CHANGE_B:
713
714 s->session->cipher=s->s3->tmp.new_cipher;
715 if (!s->method->ssl3_enc->setup_key_block(s))
716 { ret= -1; goto end; }
717
718 ret=dtls1_send_change_cipher_spec(s,
719 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
720
721 if (ret <= 0) goto end;
722
723#ifndef OPENSSL_NO_SCTP
724 /* Change to new shared key of SCTP-Auth,
725 * will be ignored if no SCTP used.
726 */
727 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
728#endif
729
730 s->state=SSL3_ST_SW_FINISHED_A;
731 s->init_num=0;
732
733 if (!s->method->ssl3_enc->change_cipher_state(s,
734 SSL3_CHANGE_CIPHER_SERVER_WRITE))
735 {
736 ret= -1;
737 goto end;
738 }
739
740 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
741 break;
742
743 case SSL3_ST_SW_FINISHED_A:
744 case SSL3_ST_SW_FINISHED_B:
745 ret=dtls1_send_finished(s,
746 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
747 s->method->ssl3_enc->server_finished_label,
748 s->method->ssl3_enc->server_finished_label_len);
749 if (ret <= 0) goto end;
750 s->state=SSL3_ST_SW_FLUSH;
751 if (s->hit)
752 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
753 else
754 {
755 s->s3->tmp.next_state=SSL_ST_OK;
756#ifndef OPENSSL_NO_SCTP
757 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
758 {
759 s->d1->next_state = s->s3->tmp.next_state;
760 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
761 }
762#endif
763 }
764 s->init_num=0;
765 break;
766
767 case SSL_ST_OK:
768 /* clean a few things up */
769 ssl3_cleanup_key_block(s);
770
771#if 0
772 BUF_MEM_free(s->init_buf);
773 s->init_buf=NULL;
774#endif
775
776 /* remove buffering on output */
777 ssl_free_wbio_buffer(s);
778
779 s->init_num=0;
780
781 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
782 {
783 s->renegotiate=0;
784 s->new_session=0;
785
786 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
787
788 s->ctx->stats.sess_accept_good++;
789 /* s->server=1; */
790 s->handshake_func=dtls1_accept;
791
792 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
793 }
794
795 ret = 1;
796
797 /* done handshaking, next message is client hello */
798 s->d1->handshake_read_seq = 0;
799 /* next message is server hello */
800 s->d1->handshake_write_seq = 0;
801 s->d1->next_handshake_write_seq = 0;
802 goto end;
803 /* break; */
804
805 default:
806 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
807 ret= -1;
808 goto end;
809 /* break; */
810 }
811
812 if (!s->s3->tmp.reuse_message && !skip)
813 {
814 if (s->debug)
815 {
816 if ((ret=BIO_flush(s->wbio)) <= 0)
817 goto end;
818 }
819
820
821 if ((cb != NULL) && (s->state != state))
822 {
823 new_state=s->state;
824 s->state=state;
825 cb(s,SSL_CB_ACCEPT_LOOP,1);
826 s->state=new_state;
827 }
828 }
829 skip=0;
830 }
831end:
832 /* BIO_flush(s->wbio); */
833
834 s->in_handshake--;
835#ifndef OPENSSL_NO_SCTP
836 /* Notify SCTP BIO socket to leave handshake
837 * mode and prevent stream identifier other
838 * than 0. Will be ignored if no SCTP is used.
839 */
840 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
841#endif
842
843 if (cb != NULL)
844 cb(s,SSL_CB_ACCEPT_EXIT,ret);
845 return(ret);
846 }
847
848int dtls1_send_hello_request(SSL *s)
849 {
850 unsigned char *p;
851
852 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
853 {
854 p=(unsigned char *)s->init_buf->data;
855 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
856
857 s->state=SSL3_ST_SW_HELLO_REQ_B;
858 /* number of bytes to write */
859 s->init_num=DTLS1_HM_HEADER_LENGTH;
860 s->init_off=0;
861
862 /* no need to buffer this message, since there are no retransmit
863 * requests for it */
864 }
865
866 /* SSL3_ST_SW_HELLO_REQ_B */
867 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
868 }
869
870int dtls1_send_hello_verify_request(SSL *s)
871 {
872 unsigned int msg_len;
873 unsigned char *msg, *buf, *p;
874
875 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
876 {
877 buf = (unsigned char *)s->init_buf->data;
878
879 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
880 *(p++) = s->version >> 8;
881 *(p++) = s->version & 0xFF;
882
883 if (s->ctx->app_gen_cookie_cb == NULL ||
884 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
885 &(s->d1->cookie_len)) == 0)
886 {
887 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
888 return 0;
889 }
890
891 *(p++) = (unsigned char) s->d1->cookie_len;
892 memcpy(p, s->d1->cookie, s->d1->cookie_len);
893 p += s->d1->cookie_len;
894 msg_len = p - msg;
895
896 dtls1_set_message_header(s, buf,
897 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
898
899 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
900 /* number of bytes to write */
901 s->init_num=p-buf;
902 s->init_off=0;
903 }
904
905 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
906 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
907 }
908
909int dtls1_send_server_hello(SSL *s)
910 {
911 unsigned char *buf;
912 unsigned char *p,*d;
913 int i;
914 unsigned int sl;
915 unsigned long l,Time;
916
917 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
918 {
919 buf=(unsigned char *)s->init_buf->data;
920 p=s->s3->server_random;
921 Time=(unsigned long)time(NULL); /* Time */
922 l2n(Time,p);
923 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
924 /* Do the message type and length last */
925 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
926
927 *(p++)=s->version>>8;
928 *(p++)=s->version&0xff;
929
930 /* Random stuff */
931 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
932 p+=SSL3_RANDOM_SIZE;
933
934 /* now in theory we have 3 options to sending back the
935 * session id. If it is a re-use, we send back the
936 * old session-id, if it is a new session, we send
937 * back the new session-id or we send back a 0 length
938 * session-id if we want it to be single use.
939 * Currently I will not implement the '0' length session-id
940 * 12-Jan-98 - I'll now support the '0' length stuff.
941 */
942 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
943 s->session->session_id_length=0;
944
945 sl=s->session->session_id_length;
946 if (sl > sizeof s->session->session_id)
947 {
948 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
949 return -1;
950 }
951 *(p++)=sl;
952 memcpy(p,s->session->session_id,sl);
953 p+=sl;
954
955 /* put the cipher */
956 if (s->s3->tmp.new_cipher == NULL)
957 return -1;
958 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
959 p+=i;
960
961 /* put the compression method */
962#ifdef OPENSSL_NO_COMP
963 *(p++)=0;
964#else
965 if (s->s3->tmp.new_compression == NULL)
966 *(p++)=0;
967 else
968 *(p++)=s->s3->tmp.new_compression->id;
969#endif
970
971#ifndef OPENSSL_NO_TLSEXT
972 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
973 {
974 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
975 return -1;
976 }
977#endif
978
979 /* do the header */
980 l=(p-d);
981 d=buf;
982
983 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
984
985 s->state=SSL3_ST_SW_SRVR_HELLO_B;
986 /* number of bytes to write */
987 s->init_num=p-buf;
988 s->init_off=0;
989
990 /* buffer the message to handle re-xmits */
991 dtls1_buffer_message(s, 0);
992 }
993
994 /* SSL3_ST_SW_SRVR_HELLO_B */
995 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
996 }
997
998int dtls1_send_server_done(SSL *s)
999 {
1000 unsigned char *p;
1001
1002 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1003 {
1004 p=(unsigned char *)s->init_buf->data;
1005
1006 /* do the header */
1007 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1008
1009 s->state=SSL3_ST_SW_SRVR_DONE_B;
1010 /* number of bytes to write */
1011 s->init_num=DTLS1_HM_HEADER_LENGTH;
1012 s->init_off=0;
1013
1014 /* buffer the message to handle re-xmits */
1015 dtls1_buffer_message(s, 0);
1016 }
1017
1018 /* SSL3_ST_SW_SRVR_DONE_B */
1019 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1020 }
1021
1022int dtls1_send_server_key_exchange(SSL *s)
1023 {
1024#ifndef OPENSSL_NO_RSA
1025 unsigned char *q;
1026 int j,num;
1027 RSA *rsa;
1028 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1029 unsigned int u;
1030#endif
1031#ifndef OPENSSL_NO_DH
1032 DH *dh=NULL,*dhp;
1033#endif
1034#ifndef OPENSSL_NO_ECDH
1035 EC_KEY *ecdh=NULL, *ecdhp;
1036 unsigned char *encodedPoint = NULL;
1037 int encodedlen = 0;
1038 int curve_id = 0;
1039 BN_CTX *bn_ctx = NULL;
1040#endif
1041 EVP_PKEY *pkey;
1042 unsigned char *p,*d;
1043 int al,i;
1044 unsigned long type;
1045 int n;
1046 CERT *cert;
1047 BIGNUM *r[4];
1048 int nr[4],kn;
1049 BUF_MEM *buf;
1050 EVP_MD_CTX md_ctx;
1051
1052 EVP_MD_CTX_init(&md_ctx);
1053 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1054 {
1055 type=s->s3->tmp.new_cipher->algorithm_mkey;
1056 cert=s->cert;
1057
1058 buf=s->init_buf;
1059
1060 r[0]=r[1]=r[2]=r[3]=NULL;
1061 n=0;
1062#ifndef OPENSSL_NO_RSA
1063 if (type & SSL_kRSA)
1064 {
1065 rsa=cert->rsa_tmp;
1066 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1067 {
1068 rsa=s->cert->rsa_tmp_cb(s,
1069 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1070 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1071 if(rsa == NULL)
1072 {
1073 al=SSL_AD_HANDSHAKE_FAILURE;
1074 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1075 goto f_err;
1076 }
1077 RSA_up_ref(rsa);
1078 cert->rsa_tmp=rsa;
1079 }
1080 if (rsa == NULL)
1081 {
1082 al=SSL_AD_HANDSHAKE_FAILURE;
1083 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1084 goto f_err;
1085 }
1086 r[0]=rsa->n;
1087 r[1]=rsa->e;
1088 s->s3->tmp.use_rsa_tmp=1;
1089 }
1090 else
1091#endif
1092#ifndef OPENSSL_NO_DH
1093 if (type & SSL_kEDH)
1094 {
1095 dhp=cert->dh_tmp;
1096 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1097 dhp=s->cert->dh_tmp_cb(s,
1098 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1099 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1100 if (dhp == NULL)
1101 {
1102 al=SSL_AD_HANDSHAKE_FAILURE;
1103 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1104 goto f_err;
1105 }
1106
1107 if (s->s3->tmp.dh != NULL)
1108 {
1109 DH_free(dh);
1110 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1111 goto err;
1112 }
1113
1114 if ((dh=DHparams_dup(dhp)) == NULL)
1115 {
1116 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1117 goto err;
1118 }
1119
1120 s->s3->tmp.dh=dh;
1121 if ((dhp->pub_key == NULL ||
1122 dhp->priv_key == NULL ||
1123 (s->options & SSL_OP_SINGLE_DH_USE)))
1124 {
1125 if(!DH_generate_key(dh))
1126 {
1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1128 ERR_R_DH_LIB);
1129 goto err;
1130 }
1131 }
1132 else
1133 {
1134 dh->pub_key=BN_dup(dhp->pub_key);
1135 dh->priv_key=BN_dup(dhp->priv_key);
1136 if ((dh->pub_key == NULL) ||
1137 (dh->priv_key == NULL))
1138 {
1139 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1140 goto err;
1141 }
1142 }
1143 r[0]=dh->p;
1144 r[1]=dh->g;
1145 r[2]=dh->pub_key;
1146 }
1147 else
1148#endif
1149#ifndef OPENSSL_NO_ECDH
1150 if (type & SSL_kEECDH)
1151 {
1152 const EC_GROUP *group;
1153
1154 ecdhp=cert->ecdh_tmp;
1155 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1156 {
1157 ecdhp=s->cert->ecdh_tmp_cb(s,
1158 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1159 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1160 }
1161 if (ecdhp == NULL)
1162 {
1163 al=SSL_AD_HANDSHAKE_FAILURE;
1164 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1165 goto f_err;
1166 }
1167
1168 if (s->s3->tmp.ecdh != NULL)
1169 {
1170 EC_KEY_free(s->s3->tmp.ecdh);
1171 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1172 goto err;
1173 }
1174
1175 /* Duplicate the ECDH structure. */
1176 if (ecdhp == NULL)
1177 {
1178 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1179 goto err;
1180 }
1181 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1182 {
1183 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1184 goto err;
1185 }
1186
1187 s->s3->tmp.ecdh=ecdh;
1188 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1189 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1190 (s->options & SSL_OP_SINGLE_ECDH_USE))
1191 {
1192 if(!EC_KEY_generate_key(ecdh))
1193 {
1194 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1195 goto err;
1196 }
1197 }
1198
1199 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1200 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1201 (EC_KEY_get0_private_key(ecdh) == NULL))
1202 {
1203 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1204 goto err;
1205 }
1206
1207 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1208 (EC_GROUP_get_degree(group) > 163))
1209 {
1210 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1211 goto err;
1212 }
1213
1214 /* XXX: For now, we only support ephemeral ECDH
1215 * keys over named (not generic) curves. For
1216 * supported named curves, curve_id is non-zero.
1217 */
1218 if ((curve_id =
1219 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1220 == 0)
1221 {
1222 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1223 goto err;
1224 }
1225
1226 /* Encode the public key.
1227 * First check the size of encoding and
1228 * allocate memory accordingly.
1229 */
1230 encodedlen = EC_POINT_point2oct(group,
1231 EC_KEY_get0_public_key(ecdh),
1232 POINT_CONVERSION_UNCOMPRESSED,
1233 NULL, 0, NULL);
1234
1235 encodedPoint = (unsigned char *)
1236 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1237 bn_ctx = BN_CTX_new();
1238 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1239 {
1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1241 goto err;
1242 }
1243
1244
1245 encodedlen = EC_POINT_point2oct(group,
1246 EC_KEY_get0_public_key(ecdh),
1247 POINT_CONVERSION_UNCOMPRESSED,
1248 encodedPoint, encodedlen, bn_ctx);
1249
1250 if (encodedlen == 0)
1251 {
1252 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1253 goto err;
1254 }
1255
1256 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1257
1258 /* XXX: For now, we only support named (not
1259 * generic) curves in ECDH ephemeral key exchanges.
1260 * In this situation, we need four additional bytes
1261 * to encode the entire ServerECDHParams
1262 * structure.
1263 */
1264 n = 4 + encodedlen;
1265
1266 /* We'll generate the serverKeyExchange message
1267 * explicitly so we can set these to NULLs
1268 */
1269 r[0]=NULL;
1270 r[1]=NULL;
1271 r[2]=NULL;
1272 r[3]=NULL;
1273 }
1274 else
1275#endif /* !OPENSSL_NO_ECDH */
1276#ifndef OPENSSL_NO_PSK
1277 if (type & SSL_kPSK)
1278 {
1279 /* reserve size for record length and PSK identity hint*/
1280 n+=2+strlen(s->ctx->psk_identity_hint);
1281 }
1282 else
1283#endif /* !OPENSSL_NO_PSK */
1284 {
1285 al=SSL_AD_HANDSHAKE_FAILURE;
1286 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1287 goto f_err;
1288 }
1289 for (i=0; r[i] != NULL; i++)
1290 {
1291 nr[i]=BN_num_bytes(r[i]);
1292 n+=2+nr[i];
1293 }
1294
1295 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1296 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1297 {
1298 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1299 == NULL)
1300 {
1301 al=SSL_AD_DECODE_ERROR;
1302 goto f_err;
1303 }
1304 kn=EVP_PKEY_size(pkey);
1305 }
1306 else
1307 {
1308 pkey=NULL;
1309 kn=0;
1310 }
1311
1312 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1313 {
1314 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1315 goto err;
1316 }
1317 d=(unsigned char *)s->init_buf->data;
1318 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1319
1320 for (i=0; r[i] != NULL; i++)
1321 {
1322 s2n(nr[i],p);
1323 BN_bn2bin(r[i],p);
1324 p+=nr[i];
1325 }
1326
1327#ifndef OPENSSL_NO_ECDH
1328 if (type & SSL_kEECDH)
1329 {
1330 /* XXX: For now, we only support named (not generic) curves.
1331 * In this situation, the serverKeyExchange message has:
1332 * [1 byte CurveType], [2 byte CurveName]
1333 * [1 byte length of encoded point], followed by
1334 * the actual encoded point itself
1335 */
1336 *p = NAMED_CURVE_TYPE;
1337 p += 1;
1338 *p = 0;
1339 p += 1;
1340 *p = curve_id;
1341 p += 1;
1342 *p = encodedlen;
1343 p += 1;
1344 memcpy((unsigned char*)p,
1345 (unsigned char *)encodedPoint,
1346 encodedlen);
1347 OPENSSL_free(encodedPoint);
1348 p += encodedlen;
1349 }
1350#endif
1351
1352#ifndef OPENSSL_NO_PSK
1353 if (type & SSL_kPSK)
1354 {
1355 /* copy PSK identity hint */
1356 s2n(strlen(s->ctx->psk_identity_hint), p);
1357 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1358 p+=strlen(s->ctx->psk_identity_hint);
1359 }
1360#endif
1361
1362 /* not anonymous */
1363 if (pkey != NULL)
1364 {
1365 /* n is the length of the params, they start at
1366 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1367 * at the end. */
1368#ifndef OPENSSL_NO_RSA
1369 if (pkey->type == EVP_PKEY_RSA)
1370 {
1371 q=md_buf;
1372 j=0;
1373 for (num=2; num > 0; num--)
1374 {
1375 EVP_DigestInit_ex(&md_ctx,(num == 2)
1376 ?s->ctx->md5:s->ctx->sha1, NULL);
1377 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1378 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1379 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1380 EVP_DigestFinal_ex(&md_ctx,q,
1381 (unsigned int *)&i);
1382 q+=i;
1383 j+=i;
1384 }
1385 if (RSA_sign(NID_md5_sha1, md_buf, j,
1386 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1387 {
1388 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1389 goto err;
1390 }
1391 s2n(u,p);
1392 n+=u+2;
1393 }
1394 else
1395#endif
1396#if !defined(OPENSSL_NO_DSA)
1397 if (pkey->type == EVP_PKEY_DSA)
1398 {
1399 /* lets do DSS */
1400 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1401 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1402 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1403 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1404 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1405 (unsigned int *)&i,pkey))
1406 {
1407 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1408 goto err;
1409 }
1410 s2n(i,p);
1411 n+=i+2;
1412 }
1413 else
1414#endif
1415#if !defined(OPENSSL_NO_ECDSA)
1416 if (pkey->type == EVP_PKEY_EC)
1417 {
1418 /* let's do ECDSA */
1419 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1420 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1421 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1422 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1423 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1424 (unsigned int *)&i,pkey))
1425 {
1426 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1427 goto err;
1428 }
1429 s2n(i,p);
1430 n+=i+2;
1431 }
1432 else
1433#endif
1434 {
1435 /* Is this error check actually needed? */
1436 al=SSL_AD_HANDSHAKE_FAILURE;
1437 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1438 goto f_err;
1439 }
1440 }
1441
1442 d = dtls1_set_message_header(s, d,
1443 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1444
1445 /* we should now have things packed up, so lets send
1446 * it off */
1447 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1448 s->init_off=0;
1449
1450 /* buffer the message to handle re-xmits */
1451 dtls1_buffer_message(s, 0);
1452 }
1453
1454 s->state = SSL3_ST_SW_KEY_EXCH_B;
1455 EVP_MD_CTX_cleanup(&md_ctx);
1456 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1457f_err:
1458 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1459err:
1460#ifndef OPENSSL_NO_ECDH
1461 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1462 BN_CTX_free(bn_ctx);
1463#endif
1464 EVP_MD_CTX_cleanup(&md_ctx);
1465 return(-1);
1466 }
1467
1468int dtls1_send_certificate_request(SSL *s)
1469 {
1470 unsigned char *p,*d;
1471 int i,j,nl,off,n;
1472 STACK_OF(X509_NAME) *sk=NULL;
1473 X509_NAME *name;
1474 BUF_MEM *buf;
1475 unsigned int msg_len;
1476
1477 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1478 {
1479 buf=s->init_buf;
1480
1481 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1482
1483 /* get the list of acceptable cert types */
1484 p++;
1485 n=ssl3_get_req_cert_type(s,p);
1486 d[0]=n;
1487 p+=n;
1488 n++;
1489
1490 off=n;
1491 p+=2;
1492 n+=2;
1493
1494 sk=SSL_get_client_CA_list(s);
1495 nl=0;
1496 if (sk != NULL)
1497 {
1498 for (i=0; i<sk_X509_NAME_num(sk); i++)
1499 {
1500 name=sk_X509_NAME_value(sk,i);
1501 j=i2d_X509_NAME(name,NULL);
1502 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1503 {
1504 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1505 goto err;
1506 }
1507 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1508 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1509 {
1510 s2n(j,p);
1511 i2d_X509_NAME(name,&p);
1512 n+=2+j;
1513 nl+=2+j;
1514 }
1515 else
1516 {
1517 d=p;
1518 i2d_X509_NAME(name,&p);
1519 j-=2; s2n(j,d); j+=2;
1520 n+=j;
1521 nl+=j;
1522 }
1523 }
1524 }
1525 /* else no CA names */
1526 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1527 s2n(nl,p);
1528
1529 d=(unsigned char *)buf->data;
1530 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1531 l2n3(n,d);
1532 s2n(s->d1->handshake_write_seq,d);
1533 s->d1->handshake_write_seq++;
1534
1535 /* we should now have things packed up, so lets send
1536 * it off */
1537
1538 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1539 s->init_off=0;
1540#ifdef NETSCAPE_HANG_BUG
1541/* XXX: what to do about this? */
1542 p=(unsigned char *)s->init_buf->data + s->init_num;
1543
1544 /* do the header */
1545 *(p++)=SSL3_MT_SERVER_DONE;
1546 *(p++)=0;
1547 *(p++)=0;
1548 *(p++)=0;
1549 s->init_num += 4;
1550#endif
1551
1552 /* XDTLS: set message header ? */
1553 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1554 dtls1_set_message_header(s, (void *)s->init_buf->data,
1555 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1556
1557 /* buffer the message to handle re-xmits */
1558 dtls1_buffer_message(s, 0);
1559
1560 s->state = SSL3_ST_SW_CERT_REQ_B;
1561 }
1562
1563 /* SSL3_ST_SW_CERT_REQ_B */
1564 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1565err:
1566 return(-1);
1567 }
1568
1569int dtls1_send_server_certificate(SSL *s)
1570 {
1571 unsigned long l;
1572 X509 *x;
1573
1574 if (s->state == SSL3_ST_SW_CERT_A)
1575 {
1576 x=ssl_get_server_send_cert(s);
1577 if (x == NULL)
1578 {
1579 /* VRS: allow null cert if auth == KRB5 */
1580 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1581 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1582 {
1583 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1584 return(0);
1585 }
1586 }
1587
1588 l=dtls1_output_cert_chain(s,x);
1589 s->state=SSL3_ST_SW_CERT_B;
1590 s->init_num=(int)l;
1591 s->init_off=0;
1592
1593 /* buffer the message to handle re-xmits */
1594 dtls1_buffer_message(s, 0);
1595 }
1596
1597 /* SSL3_ST_SW_CERT_B */
1598 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1599 }
1600
1601#ifndef OPENSSL_NO_TLSEXT
1602int dtls1_send_newsession_ticket(SSL *s)
1603 {
1604 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1605 {
1606 unsigned char *p, *senc, *macstart;
1607 int len, slen;
1608 unsigned int hlen, msg_len;
1609 EVP_CIPHER_CTX ctx;
1610 HMAC_CTX hctx;
1611 SSL_CTX *tctx = s->initial_ctx;
1612 unsigned char iv[EVP_MAX_IV_LENGTH];
1613 unsigned char key_name[16];
1614
1615 /* get session encoding length */
1616 slen = i2d_SSL_SESSION(s->session, NULL);
1617 /* Some length values are 16 bits, so forget it if session is
1618 * too long
1619 */
1620 if (slen > 0xFF00)
1621 return -1;
1622 /* Grow buffer if need be: the length calculation is as
1623 * follows 12 (DTLS handshake message header) +
1624 * 4 (ticket lifetime hint) + 2 (ticket length) +
1625 * 16 (key name) + max_iv_len (iv length) +
1626 * session_length + max_enc_block_size (max encrypted session
1627 * length) + max_md_size (HMAC).
1628 */
1629 if (!BUF_MEM_grow(s->init_buf,
1630 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1631 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1632 return -1;
1633 senc = OPENSSL_malloc(slen);
1634 if (!senc)
1635 return -1;
1636 p = senc;
1637 i2d_SSL_SESSION(s->session, &p);
1638
1639 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1640 EVP_CIPHER_CTX_init(&ctx);
1641 HMAC_CTX_init(&hctx);
1642 /* Initialize HMAC and cipher contexts. If callback present
1643 * it does all the work otherwise use generated values
1644 * from parent ctx.
1645 */
1646 if (tctx->tlsext_ticket_key_cb)
1647 {
1648 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1649 &hctx, 1) < 0)
1650 {
1651 OPENSSL_free(senc);
1652 return -1;
1653 }
1654 }
1655 else
1656 {
1657 RAND_pseudo_bytes(iv, 16);
1658 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1659 tctx->tlsext_tick_aes_key, iv);
1660 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1661 tlsext_tick_md(), NULL);
1662 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1663 }
1664 l2n(s->session->tlsext_tick_lifetime_hint, p);
1665 /* Skip ticket length for now */
1666 p += 2;
1667 /* Output key name */
1668 macstart = p;
1669 memcpy(p, key_name, 16);
1670 p += 16;
1671 /* output IV */
1672 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1673 p += EVP_CIPHER_CTX_iv_length(&ctx);
1674 /* Encrypt session data */
1675 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1676 p += len;
1677 EVP_EncryptFinal(&ctx, p, &len);
1678 p += len;
1679 EVP_CIPHER_CTX_cleanup(&ctx);
1680
1681 HMAC_Update(&hctx, macstart, p - macstart);
1682 HMAC_Final(&hctx, p, &hlen);
1683 HMAC_CTX_cleanup(&hctx);
1684
1685 p += hlen;
1686 /* Now write out lengths: p points to end of data written */
1687 /* Total length */
1688 len = p - (unsigned char *)(s->init_buf->data);
1689 /* Ticket length */
1690 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1691 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1692
1693 /* number of bytes to write */
1694 s->init_num= len;
1695 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1696 s->init_off=0;
1697 OPENSSL_free(senc);
1698
1699 /* XDTLS: set message header ? */
1700 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1701 dtls1_set_message_header(s, (void *)s->init_buf->data,
1702 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1703
1704 /* buffer the message to handle re-xmits */
1705 dtls1_buffer_message(s, 0);
1706 }
1707
1708 /* SSL3_ST_SW_SESSION_TICKET_B */
1709 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1710 }
1711#endif
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-19 22:54:43 +0000