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1/* ssl/d1_clnt.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#ifndef OPENSSL_NO_KRB5
119#include "kssl_lcl.h"
120#endif
121#include <openssl/buffer.h>
122#include <openssl/rand.h>
123#include <openssl/objects.h>
124#include <openssl/evp.h>
125#include <openssl/md5.h>
126#include <openssl/bn.h>
127#ifndef OPENSSL_NO_DH
128#include <openssl/dh.h>
129#endif
130
131static const SSL_METHOD *dtls1_get_client_method(int ver);
132static int dtls1_get_hello_verify(SSL *s);
133
134static const SSL_METHOD *dtls1_get_client_method(int ver)
135 {
136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137 return(DTLSv1_client_method());
138 else
139 return(NULL);
140 }
141
142IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143 ssl_undefined_function,
144 dtls1_connect,
145 dtls1_get_client_method)
146
147int dtls1_connect(SSL *s)
148 {
149 BUF_MEM *buf=NULL;
150 unsigned long Time=(unsigned long)time(NULL);
151 void (*cb)(const SSL *ssl,int type,int val)=NULL;
152 int ret= -1;
153 int new_state,state,skip=0;
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 s->in_handshake++;
169 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
170
171#ifndef OPENSSL_NO_SCTP
172 /* Notify SCTP BIO socket to enter handshake
173 * mode and prevent stream identifier other
174 * than 0. Will be ignored if no SCTP is used.
175 */
176 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
177#endif
178
179#ifndef OPENSSL_NO_HEARTBEATS
180 /* If we're awaiting a HeartbeatResponse, pretend we
181 * already got and don't await it anymore, because
182 * Heartbeats don't make sense during handshakes anyway.
183 */
184 if (s->tlsext_hb_pending)
185 {
186 dtls1_stop_timer(s);
187 s->tlsext_hb_pending = 0;
188 s->tlsext_hb_seq++;
189 }
190#endif
191
192 for (;;)
193 {
194 state=s->state;
195
196 switch(s->state)
197 {
198 case SSL_ST_RENEGOTIATE:
199 s->renegotiate=1;
200 s->state=SSL_ST_CONNECT;
201 s->ctx->stats.sess_connect_renegotiate++;
202 /* break */
203 case SSL_ST_BEFORE:
204 case SSL_ST_CONNECT:
205 case SSL_ST_BEFORE|SSL_ST_CONNECT:
206 case SSL_ST_OK|SSL_ST_CONNECT:
207
208 s->server=0;
209 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
210
211 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
212 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
213 {
214 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
215 ret = -1;
216 goto end;
217 }
218
219 /* s->version=SSL3_VERSION; */
220 s->type=SSL_ST_CONNECT;
221
222 if (s->init_buf == NULL)
223 {
224 if ((buf=BUF_MEM_new()) == NULL)
225 {
226 ret= -1;
227 goto end;
228 }
229 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
230 {
231 ret= -1;
232 goto end;
233 }
234 s->init_buf=buf;
235 buf=NULL;
236 }
237
238 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
239
240 /* setup buffing BIO */
241 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
242
243 /* don't push the buffering BIO quite yet */
244
245 s->state=SSL3_ST_CW_CLNT_HELLO_A;
246 s->ctx->stats.sess_connect++;
247 s->init_num=0;
248 /* mark client_random uninitialized */
249 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
250 s->d1->send_cookie = 0;
251 s->hit = 0;
252 break;
253
254#ifndef OPENSSL_NO_SCTP
255 case DTLS1_SCTP_ST_CR_READ_SOCK:
256
257 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
258 {
259 s->s3->in_read_app_data=2;
260 s->rwstate=SSL_READING;
261 BIO_clear_retry_flags(SSL_get_rbio(s));
262 BIO_set_retry_read(SSL_get_rbio(s));
263 ret = -1;
264 goto end;
265 }
266
267 s->state=s->s3->tmp.next_state;
268 break;
269
270 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
271 /* read app data until dry event */
272
273 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
274 if (ret < 0) goto end;
275
276 if (ret == 0)
277 {
278 s->s3->in_read_app_data=2;
279 s->rwstate=SSL_READING;
280 BIO_clear_retry_flags(SSL_get_rbio(s));
281 BIO_set_retry_read(SSL_get_rbio(s));
282 ret = -1;
283 goto end;
284 }
285
286 s->state=s->d1->next_state;
287 break;
288#endif
289
290 case SSL3_ST_CW_CLNT_HELLO_A:
291 case SSL3_ST_CW_CLNT_HELLO_B:
292
293 s->shutdown=0;
294
295 /* every DTLS ClientHello resets Finished MAC */
296 ssl3_init_finished_mac(s);
297
298 dtls1_start_timer(s);
299 ret=dtls1_client_hello(s);
300 if (ret <= 0) goto end;
301
302 if ( s->d1->send_cookie)
303 {
304 s->state=SSL3_ST_CW_FLUSH;
305 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
306 }
307 else
308 s->state=SSL3_ST_CR_SRVR_HELLO_A;
309
310 s->init_num=0;
311
312#ifndef OPENSSL_NO_SCTP
313 /* Disable buffering for SCTP */
314 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
315 {
316#endif
317 /* turn on buffering for the next lot of output */
318 if (s->bbio != s->wbio)
319 s->wbio=BIO_push(s->bbio,s->wbio);
320#ifndef OPENSSL_NO_SCTP
321 }
322#endif
323
324 break;
325
326 case SSL3_ST_CR_SRVR_HELLO_A:
327 case SSL3_ST_CR_SRVR_HELLO_B:
328 ret=ssl3_get_server_hello(s);
329 if (ret <= 0) goto end;
330 else
331 {
332 if (s->hit)
333 {
334#ifndef OPENSSL_NO_SCTP
335 /* Add new shared key for SCTP-Auth,
336 * will be ignored if no SCTP used.
337 */
338 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
339 DTLS1_SCTP_AUTH_LABEL);
340
341 SSL_export_keying_material(s, sctpauthkey,
342 sizeof(sctpauthkey), labelbuffer,
343 sizeof(labelbuffer), NULL, 0, 0);
344
345 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
346 sizeof(sctpauthkey), sctpauthkey);
347#endif
348
349 s->state=SSL3_ST_CR_FINISHED_A;
350 }
351 else
352 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
353 }
354 s->init_num=0;
355 break;
356
357 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
358 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
359
360 ret = dtls1_get_hello_verify(s);
361 if ( ret <= 0)
362 goto end;
363 dtls1_stop_timer(s);
364 if ( s->d1->send_cookie) /* start again, with a cookie */
365 s->state=SSL3_ST_CW_CLNT_HELLO_A;
366 else
367 s->state = SSL3_ST_CR_CERT_A;
368 s->init_num = 0;
369 break;
370
371 case SSL3_ST_CR_CERT_A:
372 case SSL3_ST_CR_CERT_B:
373#ifndef OPENSSL_NO_TLSEXT
374 ret=ssl3_check_finished(s);
375 if (ret <= 0) goto end;
376 if (ret == 2)
377 {
378 s->hit = 1;
379 if (s->tlsext_ticket_expected)
380 s->state=SSL3_ST_CR_SESSION_TICKET_A;
381 else
382 s->state=SSL3_ST_CR_FINISHED_A;
383 s->init_num=0;
384 break;
385 }
386#endif
387 /* Check if it is anon DH or PSK */
388 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
389 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
390 {
391 ret=ssl3_get_server_certificate(s);
392 if (ret <= 0) goto end;
393#ifndef OPENSSL_NO_TLSEXT
394 if (s->tlsext_status_expected)
395 s->state=SSL3_ST_CR_CERT_STATUS_A;
396 else
397 s->state=SSL3_ST_CR_KEY_EXCH_A;
398 }
399 else
400 {
401 skip = 1;
402 s->state=SSL3_ST_CR_KEY_EXCH_A;
403 }
404#else
405 }
406 else
407 skip=1;
408
409 s->state=SSL3_ST_CR_KEY_EXCH_A;
410#endif
411 s->init_num=0;
412 break;
413
414 case SSL3_ST_CR_KEY_EXCH_A:
415 case SSL3_ST_CR_KEY_EXCH_B:
416 ret=ssl3_get_key_exchange(s);
417 if (ret <= 0) goto end;
418 s->state=SSL3_ST_CR_CERT_REQ_A;
419 s->init_num=0;
420
421 /* at this point we check that we have the
422 * required stuff from the server */
423 if (!ssl3_check_cert_and_algorithm(s))
424 {
425 ret= -1;
426 goto end;
427 }
428 break;
429
430 case SSL3_ST_CR_CERT_REQ_A:
431 case SSL3_ST_CR_CERT_REQ_B:
432 ret=ssl3_get_certificate_request(s);
433 if (ret <= 0) goto end;
434 s->state=SSL3_ST_CR_SRVR_DONE_A;
435 s->init_num=0;
436 break;
437
438 case SSL3_ST_CR_SRVR_DONE_A:
439 case SSL3_ST_CR_SRVR_DONE_B:
440 ret=ssl3_get_server_done(s);
441 if (ret <= 0) goto end;
442 dtls1_stop_timer(s);
443 if (s->s3->tmp.cert_req)
444 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
445 else
446 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
447 s->init_num=0;
448
449#ifndef OPENSSL_NO_SCTP
450 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
451 state == SSL_ST_RENEGOTIATE)
452 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
453 else
454#endif
455 s->state=s->s3->tmp.next_state;
456 break;
457
458 case SSL3_ST_CW_CERT_A:
459 case SSL3_ST_CW_CERT_B:
460 case SSL3_ST_CW_CERT_C:
461 case SSL3_ST_CW_CERT_D:
462 dtls1_start_timer(s);
463 ret=dtls1_send_client_certificate(s);
464 if (ret <= 0) goto end;
465 s->state=SSL3_ST_CW_KEY_EXCH_A;
466 s->init_num=0;
467 break;
468
469 case SSL3_ST_CW_KEY_EXCH_A:
470 case SSL3_ST_CW_KEY_EXCH_B:
471 dtls1_start_timer(s);
472 ret=dtls1_send_client_key_exchange(s);
473 if (ret <= 0) goto end;
474
475#ifndef OPENSSL_NO_SCTP
476 /* Add new shared key for SCTP-Auth,
477 * will be ignored if no SCTP used.
478 */
479 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
480 DTLS1_SCTP_AUTH_LABEL);
481
482 SSL_export_keying_material(s, sctpauthkey,
483 sizeof(sctpauthkey), labelbuffer,
484 sizeof(labelbuffer), NULL, 0, 0);
485
486 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
487 sizeof(sctpauthkey), sctpauthkey);
488#endif
489
490 /* EAY EAY EAY need to check for DH fix cert
491 * sent back */
492 /* For TLS, cert_req is set to 2, so a cert chain
493 * of nothing is sent, but no verify packet is sent */
494 if (s->s3->tmp.cert_req == 1)
495 {
496 s->state=SSL3_ST_CW_CERT_VRFY_A;
497 }
498 else
499 {
500#ifndef OPENSSL_NO_SCTP
501 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
502 {
503 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
504 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
505 }
506 else
507#endif
508 s->state=SSL3_ST_CW_CHANGE_A;
509 s->s3->change_cipher_spec=0;
510 }
511
512 s->init_num=0;
513 break;
514
515 case SSL3_ST_CW_CERT_VRFY_A:
516 case SSL3_ST_CW_CERT_VRFY_B:
517 dtls1_start_timer(s);
518 ret=dtls1_send_client_verify(s);
519 if (ret <= 0) goto end;
520#ifndef OPENSSL_NO_SCTP
521 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
522 {
523 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
524 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
525 }
526 else
527#endif
528 s->state=SSL3_ST_CW_CHANGE_A;
529 s->init_num=0;
530 s->s3->change_cipher_spec=0;
531 break;
532
533 case SSL3_ST_CW_CHANGE_A:
534 case SSL3_ST_CW_CHANGE_B:
535 if (!s->hit)
536 dtls1_start_timer(s);
537 ret=dtls1_send_change_cipher_spec(s,
538 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
539 if (ret <= 0) goto end;
540
541#ifndef OPENSSL_NO_SCTP
542 /* Change to new shared key of SCTP-Auth,
543 * will be ignored if no SCTP used.
544 */
545 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
546#endif
547
548 s->state=SSL3_ST_CW_FINISHED_A;
549 s->init_num=0;
550
551 s->session->cipher=s->s3->tmp.new_cipher;
552#ifdef OPENSSL_NO_COMP
553 s->session->compress_meth=0;
554#else
555 if (s->s3->tmp.new_compression == NULL)
556 s->session->compress_meth=0;
557 else
558 s->session->compress_meth=
559 s->s3->tmp.new_compression->id;
560#endif
561 if (!s->method->ssl3_enc->setup_key_block(s))
562 {
563 ret= -1;
564 goto end;
565 }
566
567 if (!s->method->ssl3_enc->change_cipher_state(s,
568 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
569 {
570 ret= -1;
571 goto end;
572 }
573
574 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
575 break;
576
577 case SSL3_ST_CW_FINISHED_A:
578 case SSL3_ST_CW_FINISHED_B:
579 if (!s->hit)
580 dtls1_start_timer(s);
581 ret=dtls1_send_finished(s,
582 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
583 s->method->ssl3_enc->client_finished_label,
584 s->method->ssl3_enc->client_finished_label_len);
585 if (ret <= 0) goto end;
586 s->state=SSL3_ST_CW_FLUSH;
587
588 /* clear flags */
589 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
590 if (s->hit)
591 {
592 s->s3->tmp.next_state=SSL_ST_OK;
593#ifndef OPENSSL_NO_SCTP
594 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
595 {
596 s->d1->next_state = s->s3->tmp.next_state;
597 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
598 }
599#endif
600 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
601 {
602 s->state=SSL_ST_OK;
603#ifndef OPENSSL_NO_SCTP
604 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
605 {
606 s->d1->next_state = SSL_ST_OK;
607 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
608 }
609#endif
610 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
611 s->s3->delay_buf_pop_ret=0;
612 }
613 }
614 else
615 {
616#ifndef OPENSSL_NO_TLSEXT
617 /* Allow NewSessionTicket if ticket expected */
618 if (s->tlsext_ticket_expected)
619 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
620 else
621#endif
622
623 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
624 }
625 s->init_num=0;
626 break;
627
628#ifndef OPENSSL_NO_TLSEXT
629 case SSL3_ST_CR_SESSION_TICKET_A:
630 case SSL3_ST_CR_SESSION_TICKET_B:
631 ret=ssl3_get_new_session_ticket(s);
632 if (ret <= 0) goto end;
633 s->state=SSL3_ST_CR_FINISHED_A;
634 s->init_num=0;
635 break;
636
637 case SSL3_ST_CR_CERT_STATUS_A:
638 case SSL3_ST_CR_CERT_STATUS_B:
639 ret=ssl3_get_cert_status(s);
640 if (ret <= 0) goto end;
641 s->state=SSL3_ST_CR_KEY_EXCH_A;
642 s->init_num=0;
643 break;
644#endif
645
646 case SSL3_ST_CR_FINISHED_A:
647 case SSL3_ST_CR_FINISHED_B:
648 s->d1->change_cipher_spec_ok = 1;
649 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
650 SSL3_ST_CR_FINISHED_B);
651 if (ret <= 0) goto end;
652 dtls1_stop_timer(s);
653
654 if (s->hit)
655 s->state=SSL3_ST_CW_CHANGE_A;
656 else
657 s->state=SSL_ST_OK;
658
659#ifndef OPENSSL_NO_SCTP
660 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
661 state == SSL_ST_RENEGOTIATE)
662 {
663 s->d1->next_state=s->state;
664 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
665 }
666#endif
667
668 s->init_num=0;
669 break;
670
671 case SSL3_ST_CW_FLUSH:
672 s->rwstate=SSL_WRITING;
673 if (BIO_flush(s->wbio) <= 0)
674 {
675 /* If the write error was fatal, stop trying */
676 if (!BIO_should_retry(s->wbio))
677 {
678 s->rwstate=SSL_NOTHING;
679 s->state=s->s3->tmp.next_state;
680 }
681
682 ret= -1;
683 goto end;
684 }
685 s->rwstate=SSL_NOTHING;
686 s->state=s->s3->tmp.next_state;
687 break;
688
689 case SSL_ST_OK:
690 /* clean a few things up */
691 ssl3_cleanup_key_block(s);
692
693#if 0
694 if (s->init_buf != NULL)
695 {
696 BUF_MEM_free(s->init_buf);
697 s->init_buf=NULL;
698 }
699#endif
700
701 /* If we are not 'joining' the last two packets,
702 * remove the buffering now */
703 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
704 ssl_free_wbio_buffer(s);
705 /* else do it later in ssl3_write */
706
707 s->init_num=0;
708 s->renegotiate=0;
709 s->new_session=0;
710
711 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
712 if (s->hit) s->ctx->stats.sess_hit++;
713
714 ret=1;
715 /* s->server=0; */
716 s->handshake_func=dtls1_connect;
717 s->ctx->stats.sess_connect_good++;
718
719 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
720
721 /* done with handshaking */
722 s->d1->handshake_read_seq = 0;
723 s->d1->next_handshake_write_seq = 0;
724 goto end;
725 /* break; */
726
727 default:
728 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
729 ret= -1;
730 goto end;
731 /* break; */
732 }
733
734 /* did we do anything */
735 if (!s->s3->tmp.reuse_message && !skip)
736 {
737 if (s->debug)
738 {
739 if ((ret=BIO_flush(s->wbio)) <= 0)
740 goto end;
741 }
742
743 if ((cb != NULL) && (s->state != state))
744 {
745 new_state=s->state;
746 s->state=state;
747 cb(s,SSL_CB_CONNECT_LOOP,1);
748 s->state=new_state;
749 }
750 }
751 skip=0;
752 }
753end:
754 s->in_handshake--;
755
756#ifndef OPENSSL_NO_SCTP
757 /* Notify SCTP BIO socket to leave handshake
758 * mode and allow stream identifier other
759 * than 0. Will be ignored if no SCTP is used.
760 */
761 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
762#endif
763
764 if (buf != NULL)
765 BUF_MEM_free(buf);
766 if (cb != NULL)
767 cb(s,SSL_CB_CONNECT_EXIT,ret);
768 return(ret);
769 }
770
771int dtls1_client_hello(SSL *s)
772 {
773 unsigned char *buf;
774 unsigned char *p,*d;
775 unsigned int i,j;
776 unsigned long Time,l;
777 SSL_COMP *comp;
778
779 buf=(unsigned char *)s->init_buf->data;
780 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
781 {
782 SSL_SESSION *sess = s->session;
783 if ((s->session == NULL) ||
784 (s->session->ssl_version != s->version) ||
785#ifdef OPENSSL_NO_TLSEXT
786 !sess->session_id_length ||
787#else
788 (!sess->session_id_length && !sess->tlsext_tick) ||
789#endif
790 (s->session->not_resumable))
791 {
792 if (!ssl_get_new_session(s,0))
793 goto err;
794 }
795 /* else use the pre-loaded session */
796
797 p=s->s3->client_random;
798
799 /* if client_random is initialized, reuse it, we are
800 * required to use same upon reply to HelloVerify */
801 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
802 if (i==sizeof(s->s3->client_random))
803 {
804 Time=(unsigned long)time(NULL); /* Time */
805 l2n(Time,p);
806 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
807 }
808
809 /* Do the message type and length last */
810 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
811
812 *(p++)=s->version>>8;
813 *(p++)=s->version&0xff;
814 s->client_version=s->version;
815
816 /* Random stuff */
817 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
818 p+=SSL3_RANDOM_SIZE;
819
820 /* Session ID */
821 if (s->new_session)
822 i=0;
823 else
824 i=s->session->session_id_length;
825 *(p++)=i;
826 if (i != 0)
827 {
828 if (i > sizeof s->session->session_id)
829 {
830 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
831 goto err;
832 }
833 memcpy(p,s->session->session_id,i);
834 p+=i;
835 }
836
837 /* cookie stuff */
838 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
839 {
840 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
841 goto err;
842 }
843 *(p++) = s->d1->cookie_len;
844 memcpy(p, s->d1->cookie, s->d1->cookie_len);
845 p += s->d1->cookie_len;
846
847 /* Ciphers supported */
848 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
849 if (i == 0)
850 {
851 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
852 goto err;
853 }
854 s2n(i,p);
855 p+=i;
856
857 /* COMPRESSION */
858 if (s->ctx->comp_methods == NULL)
859 j=0;
860 else
861 j=sk_SSL_COMP_num(s->ctx->comp_methods);
862 *(p++)=1+j;
863 for (i=0; i<j; i++)
864 {
865 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
866 *(p++)=comp->id;
867 }
868 *(p++)=0; /* Add the NULL method */
869
870#ifndef OPENSSL_NO_TLSEXT
871 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
872 {
873 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
874 goto err;
875 }
876#endif
877
878 l=(p-d);
879 d=buf;
880
881 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
882
883 s->state=SSL3_ST_CW_CLNT_HELLO_B;
884 /* number of bytes to write */
885 s->init_num=p-buf;
886 s->init_off=0;
887
888 /* buffer the message to handle re-xmits */
889 dtls1_buffer_message(s, 0);
890 }
891
892 /* SSL3_ST_CW_CLNT_HELLO_B */
893 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
894err:
895 return(-1);
896 }
897
898static int dtls1_get_hello_verify(SSL *s)
899 {
900 int n, al, ok = 0;
901 unsigned char *data;
902 unsigned int cookie_len;
903
904 n=s->method->ssl_get_message(s,
905 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
906 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
907 -1,
908 s->max_cert_list,
909 &ok);
910
911 if (!ok) return((int)n);
912
913 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
914 {
915 s->d1->send_cookie = 0;
916 s->s3->tmp.reuse_message=1;
917 return(1);
918 }
919
920 data = (unsigned char *)s->init_msg;
921
922 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
923 {
924 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
925 s->version=(s->version&0xff00)|data[1];
926 al = SSL_AD_PROTOCOL_VERSION;
927 goto f_err;
928 }
929 data+=2;
930
931 cookie_len = *(data++);
932 if ( cookie_len > sizeof(s->d1->cookie))
933 {
934 al=SSL_AD_ILLEGAL_PARAMETER;
935 goto f_err;
936 }
937
938 memcpy(s->d1->cookie, data, cookie_len);
939 s->d1->cookie_len = cookie_len;
940
941 s->d1->send_cookie = 1;
942 return 1;
943
944f_err:
945 ssl3_send_alert(s, SSL3_AL_FATAL, al);
946 return -1;
947 }
948
949int dtls1_send_client_key_exchange(SSL *s)
950 {
951 unsigned char *p,*d;
952 int n;
953 unsigned long alg_k;
954#ifndef OPENSSL_NO_RSA
955 unsigned char *q;
956 EVP_PKEY *pkey=NULL;
957#endif
958#ifndef OPENSSL_NO_KRB5
959 KSSL_ERR kssl_err;
960#endif /* OPENSSL_NO_KRB5 */
961#ifndef OPENSSL_NO_ECDH
962 EC_KEY *clnt_ecdh = NULL;
963 const EC_POINT *srvr_ecpoint = NULL;
964 EVP_PKEY *srvr_pub_pkey = NULL;
965 unsigned char *encodedPoint = NULL;
966 int encoded_pt_len = 0;
967 BN_CTX * bn_ctx = NULL;
968#endif
969
970 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
971 {
972 d=(unsigned char *)s->init_buf->data;
973 p= &(d[DTLS1_HM_HEADER_LENGTH]);
974
975 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
976
977 /* Fool emacs indentation */
978 if (0) {}
979#ifndef OPENSSL_NO_RSA
980 else if (alg_k & SSL_kRSA)
981 {
982 RSA *rsa;
983 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
984
985 if (s->session->sess_cert->peer_rsa_tmp != NULL)
986 rsa=s->session->sess_cert->peer_rsa_tmp;
987 else
988 {
989 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
990 if ((pkey == NULL) ||
991 (pkey->type != EVP_PKEY_RSA) ||
992 (pkey->pkey.rsa == NULL))
993 {
994 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
995 goto err;
996 }
997 rsa=pkey->pkey.rsa;
998 EVP_PKEY_free(pkey);
999 }
1000
1001 tmp_buf[0]=s->client_version>>8;
1002 tmp_buf[1]=s->client_version&0xff;
1003 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1004 goto err;
1005
1006 s->session->master_key_length=sizeof tmp_buf;
1007
1008 q=p;
1009 /* Fix buf for TLS and [incidentally] DTLS */
1010 if (s->version > SSL3_VERSION)
1011 p+=2;
1012 n=RSA_public_encrypt(sizeof tmp_buf,
1013 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1014#ifdef PKCS1_CHECK
1015 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1016 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1017#endif
1018 if (n <= 0)
1019 {
1020 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1021 goto err;
1022 }
1023
1024 /* Fix buf for TLS and [incidentally] DTLS */
1025 if (s->version > SSL3_VERSION)
1026 {
1027 s2n(n,q);
1028 n+=2;
1029 }
1030
1031 s->session->master_key_length=
1032 s->method->ssl3_enc->generate_master_secret(s,
1033 s->session->master_key,
1034 tmp_buf,sizeof tmp_buf);
1035 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1036 }
1037#endif
1038#ifndef OPENSSL_NO_KRB5
1039 else if (alg_k & SSL_kKRB5)
1040 {
1041 krb5_error_code krb5rc;
1042 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1043 /* krb5_data krb5_ap_req; */
1044 krb5_data *enc_ticket;
1045 krb5_data authenticator, *authp = NULL;
1046 EVP_CIPHER_CTX ciph_ctx;
1047 const EVP_CIPHER *enc = NULL;
1048 unsigned char iv[EVP_MAX_IV_LENGTH];
1049 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1050 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1051 + EVP_MAX_IV_LENGTH];
1052 int padl, outl = sizeof(epms);
1053
1054 EVP_CIPHER_CTX_init(&ciph_ctx);
1055
1056#ifdef KSSL_DEBUG
1057 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1058 alg_k, SSL_kKRB5);
1059#endif /* KSSL_DEBUG */
1060
1061 authp = NULL;
1062#ifdef KRB5SENDAUTH
1063 if (KRB5SENDAUTH) authp = &authenticator;
1064#endif /* KRB5SENDAUTH */
1065
1066 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1067 &kssl_err);
1068 enc = kssl_map_enc(kssl_ctx->enctype);
1069 if (enc == NULL)
1070 goto err;
1071#ifdef KSSL_DEBUG
1072 {
1073 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1074 if (krb5rc && kssl_err.text)
1075 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1076 }
1077#endif /* KSSL_DEBUG */
1078
1079 if (krb5rc)
1080 {
1081 ssl3_send_alert(s,SSL3_AL_FATAL,
1082 SSL_AD_HANDSHAKE_FAILURE);
1083 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1084 kssl_err.reason);
1085 goto err;
1086 }
1087
1088 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1089 ** in place of RFC 2712 KerberosWrapper, as in:
1090 **
1091 ** Send ticket (copy to *p, set n = length)
1092 ** n = krb5_ap_req.length;
1093 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1094 ** if (krb5_ap_req.data)
1095 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1096 **
1097 ** Now using real RFC 2712 KerberosWrapper
1098 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1099 ** Note: 2712 "opaque" types are here replaced
1100 ** with a 2-byte length followed by the value.
1101 ** Example:
1102 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1103 ** Where "xx xx" = length bytes. Shown here with
1104 ** optional authenticator omitted.
1105 */
1106
1107 /* KerberosWrapper.Ticket */
1108 s2n(enc_ticket->length,p);
1109 memcpy(p, enc_ticket->data, enc_ticket->length);
1110 p+= enc_ticket->length;
1111 n = enc_ticket->length + 2;
1112
1113 /* KerberosWrapper.Authenticator */
1114 if (authp && authp->length)
1115 {
1116 s2n(authp->length,p);
1117 memcpy(p, authp->data, authp->length);
1118 p+= authp->length;
1119 n+= authp->length + 2;
1120
1121 free(authp->data);
1122 authp->data = NULL;
1123 authp->length = 0;
1124 }
1125 else
1126 {
1127 s2n(0,p);/* null authenticator length */
1128 n+=2;
1129 }
1130
1131 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1132 goto err;
1133
1134 /* 20010420 VRS. Tried it this way; failed.
1135 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1136 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1137 ** kssl_ctx->length);
1138 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1139 */
1140
1141 memset(iv, 0, sizeof iv); /* per RFC 1510 */
1142 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1143 kssl_ctx->key,iv);
1144 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1145 sizeof tmp_buf);
1146 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1147 outl += padl;
1148 if (outl > (int)sizeof epms)
1149 {
1150 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1151 goto err;
1152 }
1153 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1154
1155 /* KerberosWrapper.EncryptedPreMasterSecret */
1156 s2n(outl,p);
1157 memcpy(p, epms, outl);
1158 p+=outl;
1159 n+=outl + 2;
1160
1161 s->session->master_key_length=
1162 s->method->ssl3_enc->generate_master_secret(s,
1163 s->session->master_key,
1164 tmp_buf, sizeof tmp_buf);
1165
1166 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1167 OPENSSL_cleanse(epms, outl);
1168 }
1169#endif
1170#ifndef OPENSSL_NO_DH
1171 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1172 {
1173 DH *dh_srvr,*dh_clnt;
1174
1175 if (s->session->sess_cert->peer_dh_tmp != NULL)
1176 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1177 else
1178 {
1179 /* we get them from the cert */
1180 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1181 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1182 goto err;
1183 }
1184
1185 /* generate a new random key */
1186 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1187 {
1188 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1189 goto err;
1190 }
1191 if (!DH_generate_key(dh_clnt))
1192 {
1193 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1194 goto err;
1195 }
1196
1197 /* use the 'p' output buffer for the DH key, but
1198 * make sure to clear it out afterwards */
1199
1200 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1201
1202 if (n <= 0)
1203 {
1204 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1205 goto err;
1206 }
1207
1208 /* generate master key from the result */
1209 s->session->master_key_length=
1210 s->method->ssl3_enc->generate_master_secret(s,
1211 s->session->master_key,p,n);
1212 /* clean up */
1213 memset(p,0,n);
1214
1215 /* send off the data */
1216 n=BN_num_bytes(dh_clnt->pub_key);
1217 s2n(n,p);
1218 BN_bn2bin(dh_clnt->pub_key,p);
1219 n+=2;
1220
1221 DH_free(dh_clnt);
1222
1223 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1224 }
1225#endif
1226#ifndef OPENSSL_NO_ECDH
1227 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1228 {
1229 const EC_GROUP *srvr_group = NULL;
1230 EC_KEY *tkey;
1231 int ecdh_clnt_cert = 0;
1232 int field_size = 0;
1233
1234 /* Did we send out the client's
1235 * ECDH share for use in premaster
1236 * computation as part of client certificate?
1237 * If so, set ecdh_clnt_cert to 1.
1238 */
1239 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1240 {
1241 /* XXX: For now, we do not support client
1242 * authentication using ECDH certificates.
1243 * To add such support, one needs to add
1244 * code that checks for appropriate
1245 * conditions and sets ecdh_clnt_cert to 1.
1246 * For example, the cert have an ECC
1247 * key on the same curve as the server's
1248 * and the key should be authorized for
1249 * key agreement.
1250 *
1251 * One also needs to add code in ssl3_connect
1252 * to skip sending the certificate verify
1253 * message.
1254 *
1255 * if ((s->cert->key->privatekey != NULL) &&
1256 * (s->cert->key->privatekey->type ==
1257 * EVP_PKEY_EC) && ...)
1258 * ecdh_clnt_cert = 1;
1259 */
1260 }
1261
1262 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1263 {
1264 tkey = s->session->sess_cert->peer_ecdh_tmp;
1265 }
1266 else
1267 {
1268 /* Get the Server Public Key from Cert */
1269 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1270 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1271 if ((srvr_pub_pkey == NULL) ||
1272 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1273 (srvr_pub_pkey->pkey.ec == NULL))
1274 {
1275 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1276 ERR_R_INTERNAL_ERROR);
1277 goto err;
1278 }
1279
1280 tkey = srvr_pub_pkey->pkey.ec;
1281 }
1282
1283 srvr_group = EC_KEY_get0_group(tkey);
1284 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1285
1286 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1287 {
1288 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1289 ERR_R_INTERNAL_ERROR);
1290 goto err;
1291 }
1292
1293 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1294 {
1295 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1296 goto err;
1297 }
1298
1299 if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1300 {
1301 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1302 goto err;
1303 }
1304 if (ecdh_clnt_cert)
1305 {
1306 /* Reuse key info from our certificate
1307 * We only need our private key to perform
1308 * the ECDH computation.
1309 */
1310 const BIGNUM *priv_key;
1311 tkey = s->cert->key->privatekey->pkey.ec;
1312 priv_key = EC_KEY_get0_private_key(tkey);
1313 if (priv_key == NULL)
1314 {
1315 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1316 goto err;
1317 }
1318 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1319 {
1320 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1321 goto err;
1322 }
1323 }
1324 else
1325 {
1326 /* Generate a new ECDH key pair */
1327 if (!(EC_KEY_generate_key(clnt_ecdh)))
1328 {
1329 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1330 goto err;
1331 }
1332 }
1333
1334 /* use the 'p' output buffer for the ECDH key, but
1335 * make sure to clear it out afterwards
1336 */
1337
1338 field_size = EC_GROUP_get_degree(srvr_group);
1339 if (field_size <= 0)
1340 {
1341 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1342 ERR_R_ECDH_LIB);
1343 goto err;
1344 }
1345 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1346 if (n <= 0)
1347 {
1348 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1349 ERR_R_ECDH_LIB);
1350 goto err;
1351 }
1352
1353 /* generate master key from the result */
1354 s->session->master_key_length = s->method->ssl3_enc \
1355 -> generate_master_secret(s,
1356 s->session->master_key,
1357 p, n);
1358
1359 memset(p, 0, n); /* clean up */
1360
1361 if (ecdh_clnt_cert)
1362 {
1363 /* Send empty client key exch message */
1364 n = 0;
1365 }
1366 else
1367 {
1368 /* First check the size of encoding and
1369 * allocate memory accordingly.
1370 */
1371 encoded_pt_len =
1372 EC_POINT_point2oct(srvr_group,
1373 EC_KEY_get0_public_key(clnt_ecdh),
1374 POINT_CONVERSION_UNCOMPRESSED,
1375 NULL, 0, NULL);
1376
1377 encodedPoint = (unsigned char *)
1378 OPENSSL_malloc(encoded_pt_len *
1379 sizeof(unsigned char));
1380 bn_ctx = BN_CTX_new();
1381 if ((encodedPoint == NULL) ||
1382 (bn_ctx == NULL))
1383 {
1384 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1385 goto err;
1386 }
1387
1388 /* Encode the public key */
1389 n = EC_POINT_point2oct(srvr_group,
1390 EC_KEY_get0_public_key(clnt_ecdh),
1391 POINT_CONVERSION_UNCOMPRESSED,
1392 encodedPoint, encoded_pt_len, bn_ctx);
1393
1394 *p = n; /* length of encoded point */
1395 /* Encoded point will be copied here */
1396 p += 1;
1397 /* copy the point */
1398 memcpy((unsigned char *)p, encodedPoint, n);
1399 /* increment n to account for length field */
1400 n += 1;
1401 }
1402
1403 /* Free allocated memory */
1404 BN_CTX_free(bn_ctx);
1405 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1406 if (clnt_ecdh != NULL)
1407 EC_KEY_free(clnt_ecdh);
1408 EVP_PKEY_free(srvr_pub_pkey);
1409 }
1410#endif /* !OPENSSL_NO_ECDH */
1411
1412#ifndef OPENSSL_NO_PSK
1413 else if (alg_k & SSL_kPSK)
1414 {
1415 char identity[PSK_MAX_IDENTITY_LEN];
1416 unsigned char *t = NULL;
1417 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1418 unsigned int pre_ms_len = 0, psk_len = 0;
1419 int psk_err = 1;
1420
1421 n = 0;
1422 if (s->psk_client_callback == NULL)
1423 {
1424 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1425 SSL_R_PSK_NO_CLIENT_CB);
1426 goto err;
1427 }
1428
1429 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1430 identity, PSK_MAX_IDENTITY_LEN,
1431 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1432 if (psk_len > PSK_MAX_PSK_LEN)
1433 {
1434 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1435 ERR_R_INTERNAL_ERROR);
1436 goto psk_err;
1437 }
1438 else if (psk_len == 0)
1439 {
1440 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1441 SSL_R_PSK_IDENTITY_NOT_FOUND);
1442 goto psk_err;
1443 }
1444
1445 /* create PSK pre_master_secret */
1446 pre_ms_len = 2+psk_len+2+psk_len;
1447 t = psk_or_pre_ms;
1448 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1449 s2n(psk_len, t);
1450 memset(t, 0, psk_len);
1451 t+=psk_len;
1452 s2n(psk_len, t);
1453
1454 if (s->session->psk_identity_hint != NULL)
1455 OPENSSL_free(s->session->psk_identity_hint);
1456 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1457 if (s->ctx->psk_identity_hint != NULL &&
1458 s->session->psk_identity_hint == NULL)
1459 {
1460 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1461 ERR_R_MALLOC_FAILURE);
1462 goto psk_err;
1463 }
1464
1465 if (s->session->psk_identity != NULL)
1466 OPENSSL_free(s->session->psk_identity);
1467 s->session->psk_identity = BUF_strdup(identity);
1468 if (s->session->psk_identity == NULL)
1469 {
1470 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1471 ERR_R_MALLOC_FAILURE);
1472 goto psk_err;
1473 }
1474
1475 s->session->master_key_length =
1476 s->method->ssl3_enc->generate_master_secret(s,
1477 s->session->master_key,
1478 psk_or_pre_ms, pre_ms_len);
1479 n = strlen(identity);
1480 s2n(n, p);
1481 memcpy(p, identity, n);
1482 n+=2;
1483 psk_err = 0;
1484 psk_err:
1485 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1486 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1487 if (psk_err != 0)
1488 {
1489 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1490 goto err;
1491 }
1492 }
1493#endif
1494 else
1495 {
1496 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1497 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1498 goto err;
1499 }
1500
1501 d = dtls1_set_message_header(s, d,
1502 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1503 /*
1504 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1505 l2n3(n,d);
1506 l2n(s->d1->handshake_write_seq,d);
1507 s->d1->handshake_write_seq++;
1508 */
1509
1510 s->state=SSL3_ST_CW_KEY_EXCH_B;
1511 /* number of bytes to write */
1512 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1513 s->init_off=0;
1514
1515 /* buffer the message to handle re-xmits */
1516 dtls1_buffer_message(s, 0);
1517 }
1518
1519 /* SSL3_ST_CW_KEY_EXCH_B */
1520 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1521err:
1522#ifndef OPENSSL_NO_ECDH
1523 BN_CTX_free(bn_ctx);
1524 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1525 if (clnt_ecdh != NULL)
1526 EC_KEY_free(clnt_ecdh);
1527 EVP_PKEY_free(srvr_pub_pkey);
1528#endif
1529 return(-1);
1530 }
1531
1532int dtls1_send_client_verify(SSL *s)
1533 {
1534 unsigned char *p,*d;
1535 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1536 EVP_PKEY *pkey;
1537#ifndef OPENSSL_NO_RSA
1538 unsigned u=0;
1539#endif
1540 unsigned long n;
1541#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1542 int j;
1543#endif
1544
1545 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1546 {
1547 d=(unsigned char *)s->init_buf->data;
1548 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1549 pkey=s->cert->key->privatekey;
1550
1551 s->method->ssl3_enc->cert_verify_mac(s,
1552 NID_sha1,
1553 &(data[MD5_DIGEST_LENGTH]));
1554
1555#ifndef OPENSSL_NO_RSA
1556 if (pkey->type == EVP_PKEY_RSA)
1557 {
1558 s->method->ssl3_enc->cert_verify_mac(s,
1559 NID_md5,
1560 &(data[0]));
1561 if (RSA_sign(NID_md5_sha1, data,
1562 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1563 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1564 {
1565 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1566 goto err;
1567 }
1568 s2n(u,p);
1569 n=u+2;
1570 }
1571 else
1572#endif
1573#ifndef OPENSSL_NO_DSA
1574 if (pkey->type == EVP_PKEY_DSA)
1575 {
1576 if (!DSA_sign(pkey->save_type,
1577 &(data[MD5_DIGEST_LENGTH]),
1578 SHA_DIGEST_LENGTH,&(p[2]),
1579 (unsigned int *)&j,pkey->pkey.dsa))
1580 {
1581 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1582 goto err;
1583 }
1584 s2n(j,p);
1585 n=j+2;
1586 }
1587 else
1588#endif
1589#ifndef OPENSSL_NO_ECDSA
1590 if (pkey->type == EVP_PKEY_EC)
1591 {
1592 if (!ECDSA_sign(pkey->save_type,
1593 &(data[MD5_DIGEST_LENGTH]),
1594 SHA_DIGEST_LENGTH,&(p[2]),
1595 (unsigned int *)&j,pkey->pkey.ec))
1596 {
1597 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1598 ERR_R_ECDSA_LIB);
1599 goto err;
1600 }
1601 s2n(j,p);
1602 n=j+2;
1603 }
1604 else
1605#endif
1606 {
1607 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1608 goto err;
1609 }
1610
1611 d = dtls1_set_message_header(s, d,
1612 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1613
1614 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1615 s->init_off=0;
1616
1617 /* buffer the message to handle re-xmits */
1618 dtls1_buffer_message(s, 0);
1619
1620 s->state = SSL3_ST_CW_CERT_VRFY_B;
1621 }
1622
1623 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1624 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1625err:
1626 return(-1);
1627 }
1628
1629int dtls1_send_client_certificate(SSL *s)
1630 {
1631 X509 *x509=NULL;
1632 EVP_PKEY *pkey=NULL;
1633 int i;
1634 unsigned long l;
1635
1636 if (s->state == SSL3_ST_CW_CERT_A)
1637 {
1638 if ((s->cert == NULL) ||
1639 (s->cert->key->x509 == NULL) ||
1640 (s->cert->key->privatekey == NULL))
1641 s->state=SSL3_ST_CW_CERT_B;
1642 else
1643 s->state=SSL3_ST_CW_CERT_C;
1644 }
1645
1646 /* We need to get a client cert */
1647 if (s->state == SSL3_ST_CW_CERT_B)
1648 {
1649 /* If we get an error, we need to
1650 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1651 * We then get retied later */
1652 i=0;
1653 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1654 if (i < 0)
1655 {
1656 s->rwstate=SSL_X509_LOOKUP;
1657 return(-1);
1658 }
1659 s->rwstate=SSL_NOTHING;
1660 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1661 {
1662 s->state=SSL3_ST_CW_CERT_B;
1663 if ( !SSL_use_certificate(s,x509) ||
1664 !SSL_use_PrivateKey(s,pkey))
1665 i=0;
1666 }
1667 else if (i == 1)
1668 {
1669 i=0;
1670 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1671 }
1672
1673 if (x509 != NULL) X509_free(x509);
1674 if (pkey != NULL) EVP_PKEY_free(pkey);
1675 if (i == 0)
1676 {
1677 if (s->version == SSL3_VERSION)
1678 {
1679 s->s3->tmp.cert_req=0;
1680 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1681 return(1);
1682 }
1683 else
1684 {
1685 s->s3->tmp.cert_req=2;
1686 }
1687 }
1688
1689 /* Ok, we have a cert */
1690 s->state=SSL3_ST_CW_CERT_C;
1691 }
1692
1693 if (s->state == SSL3_ST_CW_CERT_C)
1694 {
1695 s->state=SSL3_ST_CW_CERT_D;
1696 l=dtls1_output_cert_chain(s,
1697 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1698 s->init_num=(int)l;
1699 s->init_off=0;
1700
1701 /* set header called by dtls1_output_cert_chain() */
1702
1703 /* buffer the message to handle re-xmits */
1704 dtls1_buffer_message(s, 0);
1705 }
1706 /* SSL3_ST_CW_CERT_D */
1707 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1708 }
1709
1710
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-11-02 06:55:27 +0000