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
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
133
134 static 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
142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143 ssl_undefined_function,
144 dtls1_connect,
145 dtls1_get_client_method)
146
147 int 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 s->state=SSL3_ST_CW_FINISHED_A;
542 s->init_num=0;
543
544 s->session->cipher=s->s3->tmp.new_cipher;
545 #ifdef OPENSSL_NO_COMP
546 s->session->compress_meth=0;
547 #else
548 if (s->s3->tmp.new_compression == NULL)
549 s->session->compress_meth=0;
550 else
551 s->session->compress_meth=
552 s->s3->tmp.new_compression->id;
553 #endif
554 if (!s->method->ssl3_enc->setup_key_block(s))
555 {
556 ret= -1;
557 goto end;
558 }
559
560 if (!s->method->ssl3_enc->change_cipher_state(s,
561 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
562 {
563 ret= -1;
564 goto end;
565 }
566
567 #ifndef OPENSSL_NO_SCTP
568 if (s->hit)
569 {
570 /* Change to new shared key of SCTP-Auth,
571 * will be ignored if no SCTP used.
572 */
573 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
574 }
575 #endif
576
577 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
578 break;
579
580 case SSL3_ST_CW_FINISHED_A:
581 case SSL3_ST_CW_FINISHED_B:
582 if (!s->hit)
583 dtls1_start_timer(s);
584 ret=dtls1_send_finished(s,
585 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
586 s->method->ssl3_enc->client_finished_label,
587 s->method->ssl3_enc->client_finished_label_len);
588 if (ret <= 0) goto end;
589 s->state=SSL3_ST_CW_FLUSH;
590
591 /* clear flags */
592 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
593 if (s->hit)
594 {
595 s->s3->tmp.next_state=SSL_ST_OK;
596 #ifndef OPENSSL_NO_SCTP
597 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
598 {
599 s->d1->next_state = s->s3->tmp.next_state;
600 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
601 }
602 #endif
603 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
604 {
605 s->state=SSL_ST_OK;
606 #ifndef OPENSSL_NO_SCTP
607 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
608 {
609 s->d1->next_state = SSL_ST_OK;
610 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
611 }
612 #endif
613 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
614 s->s3->delay_buf_pop_ret=0;
615 }
616 }
617 else
618 {
619 #ifndef OPENSSL_NO_SCTP
620 /* Change to new shared key of SCTP-Auth,
621 * will be ignored if no SCTP used.
622 */
623 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
624 #endif
625
626 #ifndef OPENSSL_NO_TLSEXT
627 /* Allow NewSessionTicket if ticket expected */
628 if (s->tlsext_ticket_expected)
629 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
630 else
631 #endif
632
633 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
634 }
635 s->init_num=0;
636 break;
637
638 #ifndef OPENSSL_NO_TLSEXT
639 case SSL3_ST_CR_SESSION_TICKET_A:
640 case SSL3_ST_CR_SESSION_TICKET_B:
641 ret=ssl3_get_new_session_ticket(s);
642 if (ret <= 0) goto end;
643 s->state=SSL3_ST_CR_FINISHED_A;
644 s->init_num=0;
645 break;
646
647 case SSL3_ST_CR_CERT_STATUS_A:
648 case SSL3_ST_CR_CERT_STATUS_B:
649 ret=ssl3_get_cert_status(s);
650 if (ret <= 0) goto end;
651 s->state=SSL3_ST_CR_KEY_EXCH_A;
652 s->init_num=0;
653 break;
654 #endif
655
656 case SSL3_ST_CR_FINISHED_A:
657 case SSL3_ST_CR_FINISHED_B:
658 s->d1->change_cipher_spec_ok = 1;
659 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
660 SSL3_ST_CR_FINISHED_B);
661 if (ret <= 0) goto end;
662 dtls1_stop_timer(s);
663
664 if (s->hit)
665 s->state=SSL3_ST_CW_CHANGE_A;
666 else
667 s->state=SSL_ST_OK;
668
669 #ifndef OPENSSL_NO_SCTP
670 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
671 state == SSL_ST_RENEGOTIATE)
672 {
673 s->d1->next_state=s->state;
674 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
675 }
676 #endif
677
678 s->init_num=0;
679 break;
680
681 case SSL3_ST_CW_FLUSH:
682 s->rwstate=SSL_WRITING;
683 if (BIO_flush(s->wbio) <= 0)
684 {
685 /* If the write error was fatal, stop trying */
686 if (!BIO_should_retry(s->wbio))
687 {
688 s->rwstate=SSL_NOTHING;
689 s->state=s->s3->tmp.next_state;
690 }
691
692 ret= -1;
693 goto end;
694 }
695 s->rwstate=SSL_NOTHING;
696 s->state=s->s3->tmp.next_state;
697 break;
698
699 case SSL_ST_OK:
700 /* clean a few things up */
701 ssl3_cleanup_key_block(s);
702
703 #if 0
704 if (s->init_buf != NULL)
705 {
706 BUF_MEM_free(s->init_buf);
707 s->init_buf=NULL;
708 }
709 #endif
710
711 /* If we are not 'joining' the last two packets,
712 * remove the buffering now */
713 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
714 ssl_free_wbio_buffer(s);
715 /* else do it later in ssl3_write */
716
717 s->init_num=0;
718 s->renegotiate=0;
719 s->new_session=0;
720
721 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
722 if (s->hit) s->ctx->stats.sess_hit++;
723
724 ret=1;
725 /* s->server=0; */
726 s->handshake_func=dtls1_connect;
727 s->ctx->stats.sess_connect_good++;
728
729 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
730
731 /* done with handshaking */
732 s->d1->handshake_read_seq = 0;
733 s->d1->next_handshake_write_seq = 0;
734 goto end;
735 /* break; */
736
737 default:
738 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
739 ret= -1;
740 goto end;
741 /* break; */
742 }
743
744 /* did we do anything */
745 if (!s->s3->tmp.reuse_message && !skip)
746 {
747 if (s->debug)
748 {
749 if ((ret=BIO_flush(s->wbio)) <= 0)
750 goto end;
751 }
752
753 if ((cb != NULL) && (s->state != state))
754 {
755 new_state=s->state;
756 s->state=state;
757 cb(s,SSL_CB_CONNECT_LOOP,1);
758 s->state=new_state;
759 }
760 }
761 skip=0;
762 }
763 end:
764 s->in_handshake--;
765
766 #ifndef OPENSSL_NO_SCTP
767 /* Notify SCTP BIO socket to leave handshake
768 * mode and allow stream identifier other
769 * than 0. Will be ignored if no SCTP is used.
770 */
771 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
772 #endif
773
774 if (buf != NULL)
775 BUF_MEM_free(buf);
776 if (cb != NULL)
777 cb(s,SSL_CB_CONNECT_EXIT,ret);
778 return(ret);
779 }
780
781 int dtls1_client_hello(SSL *s)
782 {
783 unsigned char *buf;
784 unsigned char *p,*d;
785 unsigned int i,j;
786 unsigned long l;
787 SSL_COMP *comp;
788
789 buf=(unsigned char *)s->init_buf->data;
790 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
791 {
792 SSL_SESSION *sess = s->session;
793 if ((s->session == NULL) ||
794 (s->session->ssl_version != s->version) ||
795 #ifdef OPENSSL_NO_TLSEXT
796 !sess->session_id_length ||
797 #else
798 (!sess->session_id_length && !sess->tlsext_tick) ||
799 #endif
800 (s->session->not_resumable))
801 {
802 if (!ssl_get_new_session(s,0))
803 goto err;
804 }
805 /* else use the pre-loaded session */
806
807 p=s->s3->client_random;
808
809 /* if client_random is initialized, reuse it, we are
810 * required to use same upon reply to HelloVerify */
811 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++)
812 ;
813 if (i==sizeof(s->s3->client_random))
814 ssl_fill_hello_random(s, 0, p,
815 sizeof(s->s3->client_random));
816
817 /* Do the message type and length last */
818 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
819
820 *(p++)=s->version>>8;
821 *(p++)=s->version&0xff;
822 s->client_version=s->version;
823
824 /* Random stuff */
825 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
826 p+=SSL3_RANDOM_SIZE;
827
828 /* Session ID */
829 if (s->new_session)
830 i=0;
831 else
832 i=s->session->session_id_length;
833 *(p++)=i;
834 if (i != 0)
835 {
836 if (i > sizeof s->session->session_id)
837 {
838 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
839 goto err;
840 }
841 memcpy(p,s->session->session_id,i);
842 p+=i;
843 }
844
845 /* cookie stuff */
846 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
847 {
848 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
849 goto err;
850 }
851 *(p++) = s->d1->cookie_len;
852 memcpy(p, s->d1->cookie, s->d1->cookie_len);
853 p += s->d1->cookie_len;
854
855 /* Ciphers supported */
856 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
857 if (i == 0)
858 {
859 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
860 goto err;
861 }
862 s2n(i,p);
863 p+=i;
864
865 /* COMPRESSION */
866 if (s->ctx->comp_methods == NULL)
867 j=0;
868 else
869 j=sk_SSL_COMP_num(s->ctx->comp_methods);
870 *(p++)=1+j;
871 for (i=0; i<j; i++)
872 {
873 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
874 *(p++)=comp->id;
875 }
876 *(p++)=0; /* Add the NULL method */
877
878 #ifndef OPENSSL_NO_TLSEXT
879 /* TLS extensions*/
880 if (ssl_prepare_clienthello_tlsext(s) <= 0)
881 {
882 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
883 goto err;
884 }
885 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
886 {
887 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
888 goto err;
889 }
890 #endif
891
892 l=(p-d);
893 d=buf;
894
895 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
896
897 s->state=SSL3_ST_CW_CLNT_HELLO_B;
898 /* number of bytes to write */
899 s->init_num=p-buf;
900 s->init_off=0;
901
902 /* buffer the message to handle re-xmits */
903 dtls1_buffer_message(s, 0);
904 }
905
906 /* SSL3_ST_CW_CLNT_HELLO_B */
907 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
908 err:
909 return(-1);
910 }
911
912 static int dtls1_get_hello_verify(SSL *s)
913 {
914 int n, al, ok = 0;
915 unsigned char *data;
916 unsigned int cookie_len;
917
918 n=s->method->ssl_get_message(s,
919 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
920 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
921 -1,
922 s->max_cert_list,
923 &ok);
924
925 if (!ok) return((int)n);
926
927 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
928 {
929 s->d1->send_cookie = 0;
930 s->s3->tmp.reuse_message=1;
931 return(1);
932 }
933
934 data = (unsigned char *)s->init_msg;
935
936 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
937 {
938 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
939 s->version=(s->version&0xff00)|data[1];
940 al = SSL_AD_PROTOCOL_VERSION;
941 goto f_err;
942 }
943 data+=2;
944
945 cookie_len = *(data++);
946 if ( cookie_len > sizeof(s->d1->cookie))
947 {
948 al=SSL_AD_ILLEGAL_PARAMETER;
949 goto f_err;
950 }
951
952 memcpy(s->d1->cookie, data, cookie_len);
953 s->d1->cookie_len = cookie_len;
954
955 s->d1->send_cookie = 1;
956 return 1;
957
958 f_err:
959 ssl3_send_alert(s, SSL3_AL_FATAL, al);
960 return -1;
961 }
962
963 int dtls1_send_client_key_exchange(SSL *s)
964 {
965 unsigned char *p,*d;
966 int n;
967 unsigned long alg_k;
968 #ifndef OPENSSL_NO_RSA
969 unsigned char *q;
970 EVP_PKEY *pkey=NULL;
971 #endif
972 #ifndef OPENSSL_NO_KRB5
973 KSSL_ERR kssl_err;
974 #endif /* OPENSSL_NO_KRB5 */
975 #ifndef OPENSSL_NO_ECDH
976 EC_KEY *clnt_ecdh = NULL;
977 const EC_POINT *srvr_ecpoint = NULL;
978 EVP_PKEY *srvr_pub_pkey = NULL;
979 unsigned char *encodedPoint = NULL;
980 int encoded_pt_len = 0;
981 BN_CTX * bn_ctx = NULL;
982 #endif
983
984 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
985 {
986 d=(unsigned char *)s->init_buf->data;
987 p= &(d[DTLS1_HM_HEADER_LENGTH]);
988
989 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
990
991 /* Fool emacs indentation */
992 if (0) {}
993 #ifndef OPENSSL_NO_RSA
994 else if (alg_k & SSL_kRSA)
995 {
996 RSA *rsa;
997 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
998
999 if (s->session->sess_cert == NULL)
1000 {
1001 /* We should always have a server certificate with SSL_kRSA. */
1002 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1003 goto err;
1004 }
1005
1006 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1007 rsa=s->session->sess_cert->peer_rsa_tmp;
1008 else
1009 {
1010 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1011 if ((pkey == NULL) ||
1012 (pkey->type != EVP_PKEY_RSA) ||
1013 (pkey->pkey.rsa == NULL))
1014 {
1015 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1016 goto err;
1017 }
1018 rsa=pkey->pkey.rsa;
1019 EVP_PKEY_free(pkey);
1020 }
1021
1022 tmp_buf[0]=s->client_version>>8;
1023 tmp_buf[1]=s->client_version&0xff;
1024 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1025 goto err;
1026
1027 s->session->master_key_length=sizeof tmp_buf;
1028
1029 q=p;
1030 /* Fix buf for TLS and [incidentally] DTLS */
1031 if (s->version > SSL3_VERSION)
1032 p+=2;
1033 n=RSA_public_encrypt(sizeof tmp_buf,
1034 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1035 #ifdef PKCS1_CHECK
1036 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1037 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1038 #endif
1039 if (n <= 0)
1040 {
1041 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1042 goto err;
1043 }
1044
1045 /* Fix buf for TLS and [incidentally] DTLS */
1046 if (s->version > SSL3_VERSION)
1047 {
1048 s2n(n,q);
1049 n+=2;
1050 }
1051
1052 s->session->master_key_length=
1053 s->method->ssl3_enc->generate_master_secret(s,
1054 s->session->master_key,
1055 tmp_buf,sizeof tmp_buf);
1056 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1057 }
1058 #endif
1059 #ifndef OPENSSL_NO_KRB5
1060 else if (alg_k & SSL_kKRB5)
1061 {
1062 krb5_error_code krb5rc;
1063 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1064 /* krb5_data krb5_ap_req; */
1065 krb5_data *enc_ticket;
1066 krb5_data authenticator, *authp = NULL;
1067 EVP_CIPHER_CTX ciph_ctx;
1068 const EVP_CIPHER *enc = NULL;
1069 unsigned char iv[EVP_MAX_IV_LENGTH];
1070 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1071 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1072 + EVP_MAX_IV_LENGTH];
1073 int padl, outl = sizeof(epms);
1074
1075 EVP_CIPHER_CTX_init(&ciph_ctx);
1076
1077 #ifdef KSSL_DEBUG
1078 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1079 alg_k, SSL_kKRB5);
1080 #endif /* KSSL_DEBUG */
1081
1082 authp = NULL;
1083 #ifdef KRB5SENDAUTH
1084 if (KRB5SENDAUTH) authp = &authenticator;
1085 #endif /* KRB5SENDAUTH */
1086
1087 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1088 &kssl_err);
1089 enc = kssl_map_enc(kssl_ctx->enctype);
1090 if (enc == NULL)
1091 goto err;
1092 #ifdef KSSL_DEBUG
1093 {
1094 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1095 if (krb5rc && kssl_err.text)
1096 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1097 }
1098 #endif /* KSSL_DEBUG */
1099
1100 if (krb5rc)
1101 {
1102 ssl3_send_alert(s,SSL3_AL_FATAL,
1103 SSL_AD_HANDSHAKE_FAILURE);
1104 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1105 kssl_err.reason);
1106 goto err;
1107 }
1108
1109 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1110 ** in place of RFC 2712 KerberosWrapper, as in:
1111 **
1112 ** Send ticket (copy to *p, set n = length)
1113 ** n = krb5_ap_req.length;
1114 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1115 ** if (krb5_ap_req.data)
1116 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1117 **
1118 ** Now using real RFC 2712 KerberosWrapper
1119 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1120 ** Note: 2712 "opaque" types are here replaced
1121 ** with a 2-byte length followed by the value.
1122 ** Example:
1123 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1124 ** Where "xx xx" = length bytes. Shown here with
1125 ** optional authenticator omitted.
1126 */
1127
1128 /* KerberosWrapper.Ticket */
1129 s2n(enc_ticket->length,p);
1130 memcpy(p, enc_ticket->data, enc_ticket->length);
1131 p+= enc_ticket->length;
1132 n = enc_ticket->length + 2;
1133
1134 /* KerberosWrapper.Authenticator */
1135 if (authp && authp->length)
1136 {
1137 s2n(authp->length,p);
1138 memcpy(p, authp->data, authp->length);
1139 p+= authp->length;
1140 n+= authp->length + 2;
1141
1142 free(authp->data);
1143 authp->data = NULL;
1144 authp->length = 0;
1145 }
1146 else
1147 {
1148 s2n(0,p);/* null authenticator length */
1149 n+=2;
1150 }
1151
1152 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1153 goto err;
1154
1155 /* 20010420 VRS. Tried it this way; failed.
1156 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1157 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1158 ** kssl_ctx->length);
1159 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1160 */
1161
1162 memset(iv, 0, sizeof iv); /* per RFC 1510 */
1163 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1164 kssl_ctx->key,iv);
1165 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1166 sizeof tmp_buf);
1167 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1168 outl += padl;
1169 if (outl > (int)sizeof epms)
1170 {
1171 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1172 goto err;
1173 }
1174 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1175
1176 /* KerberosWrapper.EncryptedPreMasterSecret */
1177 s2n(outl,p);
1178 memcpy(p, epms, outl);
1179 p+=outl;
1180 n+=outl + 2;
1181
1182 s->session->master_key_length=
1183 s->method->ssl3_enc->generate_master_secret(s,
1184 s->session->master_key,
1185 tmp_buf, sizeof tmp_buf);
1186
1187 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1188 OPENSSL_cleanse(epms, outl);
1189 }
1190 #endif
1191 #ifndef OPENSSL_NO_DH
1192 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1193 {
1194 DH *dh_srvr,*dh_clnt;
1195
1196 if (s->session->sess_cert == NULL)
1197 {
1198 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1199 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1200 goto err;
1201 }
1202
1203 if (s->session->sess_cert->peer_dh_tmp != NULL)
1204 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1205 else
1206 {
1207 /* we get them from the cert */
1208 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1209 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1210 goto err;
1211 }
1212
1213 /* generate a new random key */
1214 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1215 {
1216 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1217 goto err;
1218 }
1219 if (!DH_generate_key(dh_clnt))
1220 {
1221 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1222 goto err;
1223 }
1224
1225 /* use the 'p' output buffer for the DH key, but
1226 * make sure to clear it out afterwards */
1227
1228 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1229
1230 if (n <= 0)
1231 {
1232 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1233 goto err;
1234 }
1235
1236 /* generate master key from the result */
1237 s->session->master_key_length=
1238 s->method->ssl3_enc->generate_master_secret(s,
1239 s->session->master_key,p,n);
1240 /* clean up */
1241 memset(p,0,n);
1242
1243 /* send off the data */
1244 n=BN_num_bytes(dh_clnt->pub_key);
1245 s2n(n,p);
1246 BN_bn2bin(dh_clnt->pub_key,p);
1247 n+=2;
1248
1249 DH_free(dh_clnt);
1250
1251 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1252 }
1253 #endif
1254 #ifndef OPENSSL_NO_ECDH
1255 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1256 {
1257 const EC_GROUP *srvr_group = NULL;
1258 EC_KEY *tkey;
1259 int ecdh_clnt_cert = 0;
1260 int field_size = 0;
1261
1262 if (s->session->sess_cert == NULL)
1263 {
1264 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1265 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1266 goto err;
1267 }
1268
1269 /* Did we send out the client's
1270 * ECDH share for use in premaster
1271 * computation as part of client certificate?
1272 * If so, set ecdh_clnt_cert to 1.
1273 */
1274 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1275 {
1276 /* XXX: For now, we do not support client
1277 * authentication using ECDH certificates.
1278 * To add such support, one needs to add
1279 * code that checks for appropriate
1280 * conditions and sets ecdh_clnt_cert to 1.
1281 * For example, the cert have an ECC
1282 * key on the same curve as the server's
1283 * and the key should be authorized for
1284 * key agreement.
1285 *
1286 * One also needs to add code in ssl3_connect
1287 * to skip sending the certificate verify
1288 * message.
1289 *
1290 * if ((s->cert->key->privatekey != NULL) &&
1291 * (s->cert->key->privatekey->type ==
1292 * EVP_PKEY_EC) && ...)
1293 * ecdh_clnt_cert = 1;
1294 */
1295 }
1296
1297 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1298 {
1299 tkey = s->session->sess_cert->peer_ecdh_tmp;
1300 }
1301 else
1302 {
1303 /* Get the Server Public Key from Cert */
1304 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1305 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1306 if ((srvr_pub_pkey == NULL) ||
1307 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1308 (srvr_pub_pkey->pkey.ec == NULL))
1309 {
1310 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1311 ERR_R_INTERNAL_ERROR);
1312 goto err;
1313 }
1314
1315 tkey = srvr_pub_pkey->pkey.ec;
1316 }
1317
1318 srvr_group = EC_KEY_get0_group(tkey);
1319 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1320
1321 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1322 {
1323 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1324 ERR_R_INTERNAL_ERROR);
1325 goto err;
1326 }
1327
1328 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1329 {
1330 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1331 goto err;
1332 }
1333
1334 if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1335 {
1336 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1337 goto err;
1338 }
1339 if (ecdh_clnt_cert)
1340 {
1341 /* Reuse key info from our certificate
1342 * We only need our private key to perform
1343 * the ECDH computation.
1344 */
1345 const BIGNUM *priv_key;
1346 tkey = s->cert->key->privatekey->pkey.ec;
1347 priv_key = EC_KEY_get0_private_key(tkey);
1348 if (priv_key == NULL)
1349 {
1350 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1351 goto err;
1352 }
1353 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1354 {
1355 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1356 goto err;
1357 }
1358 }
1359 else
1360 {
1361 /* Generate a new ECDH key pair */
1362 if (!(EC_KEY_generate_key(clnt_ecdh)))
1363 {
1364 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1365 goto err;
1366 }
1367 }
1368
1369 /* use the 'p' output buffer for the ECDH key, but
1370 * make sure to clear it out afterwards
1371 */
1372
1373 field_size = EC_GROUP_get_degree(srvr_group);
1374 if (field_size <= 0)
1375 {
1376 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1377 ERR_R_ECDH_LIB);
1378 goto err;
1379 }
1380 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1381 if (n <= 0)
1382 {
1383 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1384 ERR_R_ECDH_LIB);
1385 goto err;
1386 }
1387
1388 /* generate master key from the result */
1389 s->session->master_key_length = s->method->ssl3_enc \
1390 -> generate_master_secret(s,
1391 s->session->master_key,
1392 p, n);
1393
1394 memset(p, 0, n); /* clean up */
1395
1396 if (ecdh_clnt_cert)
1397 {
1398 /* Send empty client key exch message */
1399 n = 0;
1400 }
1401 else
1402 {
1403 /* First check the size of encoding and
1404 * allocate memory accordingly.
1405 */
1406 encoded_pt_len =
1407 EC_POINT_point2oct(srvr_group,
1408 EC_KEY_get0_public_key(clnt_ecdh),
1409 POINT_CONVERSION_UNCOMPRESSED,
1410 NULL, 0, NULL);
1411
1412 encodedPoint = (unsigned char *)
1413 OPENSSL_malloc(encoded_pt_len *
1414 sizeof(unsigned char));
1415 bn_ctx = BN_CTX_new();
1416 if ((encodedPoint == NULL) ||
1417 (bn_ctx == NULL))
1418 {
1419 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1420 goto err;
1421 }
1422
1423 /* Encode the public key */
1424 n = EC_POINT_point2oct(srvr_group,
1425 EC_KEY_get0_public_key(clnt_ecdh),
1426 POINT_CONVERSION_UNCOMPRESSED,
1427 encodedPoint, encoded_pt_len, bn_ctx);
1428
1429 *p = n; /* length of encoded point */
1430 /* Encoded point will be copied here */
1431 p += 1;
1432 /* copy the point */
1433 memcpy((unsigned char *)p, encodedPoint, n);
1434 /* increment n to account for length field */
1435 n += 1;
1436 }
1437
1438 /* Free allocated memory */
1439 BN_CTX_free(bn_ctx);
1440 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1441 if (clnt_ecdh != NULL)
1442 EC_KEY_free(clnt_ecdh);
1443 EVP_PKEY_free(srvr_pub_pkey);
1444 }
1445 #endif /* !OPENSSL_NO_ECDH */
1446
1447 #ifndef OPENSSL_NO_PSK
1448 else if (alg_k & SSL_kPSK)
1449 {
1450 char identity[PSK_MAX_IDENTITY_LEN];
1451 unsigned char *t = NULL;
1452 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1453 unsigned int pre_ms_len = 0, psk_len = 0;
1454 int psk_err = 1;
1455
1456 n = 0;
1457 if (s->psk_client_callback == NULL)
1458 {
1459 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1460 SSL_R_PSK_NO_CLIENT_CB);
1461 goto err;
1462 }
1463
1464 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1465 identity, PSK_MAX_IDENTITY_LEN,
1466 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1467 if (psk_len > PSK_MAX_PSK_LEN)
1468 {
1469 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1470 ERR_R_INTERNAL_ERROR);
1471 goto psk_err;
1472 }
1473 else if (psk_len == 0)
1474 {
1475 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1476 SSL_R_PSK_IDENTITY_NOT_FOUND);
1477 goto psk_err;
1478 }
1479
1480 /* create PSK pre_master_secret */
1481 pre_ms_len = 2+psk_len+2+psk_len;
1482 t = psk_or_pre_ms;
1483 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1484 s2n(psk_len, t);
1485 memset(t, 0, psk_len);
1486 t+=psk_len;
1487 s2n(psk_len, t);
1488
1489 if (s->session->psk_identity_hint != NULL)
1490 OPENSSL_free(s->session->psk_identity_hint);
1491 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1492 if (s->ctx->psk_identity_hint != NULL &&
1493 s->session->psk_identity_hint == NULL)
1494 {
1495 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1496 ERR_R_MALLOC_FAILURE);
1497 goto psk_err;
1498 }
1499
1500 if (s->session->psk_identity != NULL)
1501 OPENSSL_free(s->session->psk_identity);
1502 s->session->psk_identity = BUF_strdup(identity);
1503 if (s->session->psk_identity == NULL)
1504 {
1505 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1506 ERR_R_MALLOC_FAILURE);
1507 goto psk_err;
1508 }
1509
1510 s->session->master_key_length =
1511 s->method->ssl3_enc->generate_master_secret(s,
1512 s->session->master_key,
1513 psk_or_pre_ms, pre_ms_len);
1514 n = strlen(identity);
1515 s2n(n, p);
1516 memcpy(p, identity, n);
1517 n+=2;
1518 psk_err = 0;
1519 psk_err:
1520 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1521 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1522 if (psk_err != 0)
1523 {
1524 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1525 goto err;
1526 }
1527 }
1528 #endif
1529 else
1530 {
1531 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1532 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1533 goto err;
1534 }
1535
1536 d = dtls1_set_message_header(s, d,
1537 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1538 /*
1539 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1540 l2n3(n,d);
1541 l2n(s->d1->handshake_write_seq,d);
1542 s->d1->handshake_write_seq++;
1543 */
1544
1545 s->state=SSL3_ST_CW_KEY_EXCH_B;
1546 /* number of bytes to write */
1547 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1548 s->init_off=0;
1549
1550 /* buffer the message to handle re-xmits */
1551 dtls1_buffer_message(s, 0);
1552 }
1553
1554 /* SSL3_ST_CW_KEY_EXCH_B */
1555 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1556 err:
1557 #ifndef OPENSSL_NO_ECDH
1558 BN_CTX_free(bn_ctx);
1559 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1560 if (clnt_ecdh != NULL)
1561 EC_KEY_free(clnt_ecdh);
1562 EVP_PKEY_free(srvr_pub_pkey);
1563 #endif
1564 return(-1);
1565 }
1566
1567 int dtls1_send_client_verify(SSL *s)
1568 {
1569 unsigned char *p,*d;
1570 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1571 EVP_PKEY *pkey;
1572 #ifndef OPENSSL_NO_RSA
1573 unsigned u=0;
1574 #endif
1575 unsigned long n;
1576 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1577 int j;
1578 #endif
1579
1580 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1581 {
1582 d=(unsigned char *)s->init_buf->data;
1583 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1584 pkey=s->cert->key->privatekey;
1585
1586 s->method->ssl3_enc->cert_verify_mac(s,
1587 NID_sha1,
1588 &(data[MD5_DIGEST_LENGTH]));
1589
1590 #ifndef OPENSSL_NO_RSA
1591 if (pkey->type == EVP_PKEY_RSA)
1592 {
1593 s->method->ssl3_enc->cert_verify_mac(s,
1594 NID_md5,
1595 &(data[0]));
1596 if (RSA_sign(NID_md5_sha1, data,
1597 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1598 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1599 {
1600 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1601 goto err;
1602 }
1603 s2n(u,p);
1604 n=u+2;
1605 }
1606 else
1607 #endif
1608 #ifndef OPENSSL_NO_DSA
1609 if (pkey->type == EVP_PKEY_DSA)
1610 {
1611 if (!DSA_sign(pkey->save_type,
1612 &(data[MD5_DIGEST_LENGTH]),
1613 SHA_DIGEST_LENGTH,&(p[2]),
1614 (unsigned int *)&j,pkey->pkey.dsa))
1615 {
1616 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1617 goto err;
1618 }
1619 s2n(j,p);
1620 n=j+2;
1621 }
1622 else
1623 #endif
1624 #ifndef OPENSSL_NO_ECDSA
1625 if (pkey->type == EVP_PKEY_EC)
1626 {
1627 if (!ECDSA_sign(pkey->save_type,
1628 &(data[MD5_DIGEST_LENGTH]),
1629 SHA_DIGEST_LENGTH,&(p[2]),
1630 (unsigned int *)&j,pkey->pkey.ec))
1631 {
1632 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1633 ERR_R_ECDSA_LIB);
1634 goto err;
1635 }
1636 s2n(j,p);
1637 n=j+2;
1638 }
1639 else
1640 #endif
1641 {
1642 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1643 goto err;
1644 }
1645
1646 d = dtls1_set_message_header(s, d,
1647 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1648
1649 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1650 s->init_off=0;
1651
1652 /* buffer the message to handle re-xmits */
1653 dtls1_buffer_message(s, 0);
1654
1655 s->state = SSL3_ST_CW_CERT_VRFY_B;
1656 }
1657
1658 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1659 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1660 err:
1661 return(-1);
1662 }
1663
1664 int dtls1_send_client_certificate(SSL *s)
1665 {
1666 X509 *x509=NULL;
1667 EVP_PKEY *pkey=NULL;
1668 int i;
1669 unsigned long l;
1670
1671 if (s->state == SSL3_ST_CW_CERT_A)
1672 {
1673 if ((s->cert == NULL) ||
1674 (s->cert->key->x509 == NULL) ||
1675 (s->cert->key->privatekey == NULL))
1676 s->state=SSL3_ST_CW_CERT_B;
1677 else
1678 s->state=SSL3_ST_CW_CERT_C;
1679 }
1680
1681 /* We need to get a client cert */
1682 if (s->state == SSL3_ST_CW_CERT_B)
1683 {
1684 /* If we get an error, we need to
1685 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1686 * We then get retied later */
1687 i=0;
1688 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1689 if (i < 0)
1690 {
1691 s->rwstate=SSL_X509_LOOKUP;
1692 return(-1);
1693 }
1694 s->rwstate=SSL_NOTHING;
1695 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1696 {
1697 s->state=SSL3_ST_CW_CERT_B;
1698 if ( !SSL_use_certificate(s,x509) ||
1699 !SSL_use_PrivateKey(s,pkey))
1700 i=0;
1701 }
1702 else if (i == 1)
1703 {
1704 i=0;
1705 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1706 }
1707
1708 if (x509 != NULL) X509_free(x509);
1709 if (pkey != NULL) EVP_PKEY_free(pkey);
1710 if (i == 0)
1711 {
1712 if (s->version == SSL3_VERSION)
1713 {
1714 s->s3->tmp.cert_req=0;
1715 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1716 return(1);
1717 }
1718 else
1719 {
1720 s->s3->tmp.cert_req=2;
1721 }
1722 }
1723
1724 /* Ok, we have a cert */
1725 s->state=SSL3_ST_CW_CERT_C;
1726 }
1727
1728 if (s->state == SSL3_ST_CW_CERT_C)
1729 {
1730 s->state=SSL3_ST_CW_CERT_D;
1731 l=dtls1_output_cert_chain(s,
1732 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1733 s->init_num=(int)l;
1734 s->init_off=0;
1735
1736 /* set header called by dtls1_output_cert_chain() */
1737
1738 /* buffer the message to handle re-xmits */
1739 dtls1_buffer_message(s, 0);
1740 }
1741 /* SSL3_ST_CW_CERT_D */
1742 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1743 }