]> git.ipfire.org Git - thirdparty/openssl.git/blob - ssl/d1_clnt.c
projects / thirdparty / openssl.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
PR: 2658
[thirdparty/openssl.git] / ssl / d1_clnt.c
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 <openssl/crypto.h>
118 #include "ssl_locl.h"
119 #ifndef OPENSSL_NO_KRB5
120 #include "kssl_lcl.h"
121 #endif
122 #include <openssl/buffer.h>
123 #include <openssl/rand.h>
124 #include <openssl/objects.h>
125 #include <openssl/evp.h>
126 #include <openssl/md5.h>
127 #include <openssl/bn.h>
128 #ifndef OPENSSL_NO_DH
129 #include <openssl/dh.h>
130 #endif
131
132 static const SSL_METHOD *dtls1_get_client_method(int ver);
133 static int dtls1_get_hello_verify(SSL *s);
134
135 static const SSL_METHOD *dtls1_get_client_method(int ver)
136 {
137 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
138 return(DTLSv1_client_method());
139 else
140 return(NULL);
141 }
142
143 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
144 ssl_undefined_function,
145 dtls1_connect,
146 dtls1_get_client_method)
147
148 int dtls1_connect(SSL *s)
149 {
150 BUF_MEM *buf=NULL;
151 unsigned long Time=(unsigned long)time(NULL);
152 void (*cb)(const SSL *ssl,int type,int val)=NULL;
153 int ret= -1;
154 int new_state,state,skip=0;
155 #ifndef OPENSSL_NO_SCTP
156 unsigned char sctpauthkey[64];
157 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
158 #endif
159
160 RAND_add(&Time,sizeof(Time),0);
161 ERR_clear_error();
162 clear_sys_error();
163
164 if (s->info_callback != NULL)
165 cb=s->info_callback;
166 else if (s->ctx->info_callback != NULL)
167 cb=s->ctx->info_callback;
168
169 s->in_handshake++;
170 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
171
172 #ifndef OPENSSL_NO_SCTP
173 /* Notify SCTP BIO socket to enter handshake
174 * mode and prevent stream identifier other
175 * than 0. Will be ignored if no SCTP is used.
176 */
177 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
178 #endif
179
180 #ifndef OPENSSL_NO_HEARTBEATS
181 /* If we're awaiting a HeartbeatResponse, pretend we
182 * already got and don't await it anymore, because
183 * Heartbeats don't make sense during handshakes anyway.
184 */
185 if (s->tlsext_hb_pending)
186 {
187 dtls1_stop_timer(s);
188 s->tlsext_hb_pending = 0;
189 s->tlsext_hb_seq++;
190 }
191 #endif
192
193 for (;;)
194 {
195 state=s->state;
196
197 switch(s->state)
198 {
199 case SSL_ST_RENEGOTIATE:
200 s->renegotiate=1;
201 s->state=SSL_ST_CONNECT;
202 s->ctx->stats.sess_connect_renegotiate++;
203 /* break */
204 case SSL_ST_BEFORE:
205 case SSL_ST_CONNECT:
206 case SSL_ST_BEFORE|SSL_ST_CONNECT:
207 case SSL_ST_OK|SSL_ST_CONNECT:
208
209 s->server=0;
210 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
211
212 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
213 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
214 {
215 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
216 ret = -1;
217 goto end;
218 }
219
220 /* s->version=SSL3_VERSION; */
221 s->type=SSL_ST_CONNECT;
222
223 if (s->init_buf == NULL)
224 {
225 if ((buf=BUF_MEM_new()) == NULL)
226 {
227 ret= -1;
228 goto end;
229 }
230 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
231 {
232 ret= -1;
233 goto end;
234 }
235 s->init_buf=buf;
236 buf=NULL;
237 }
238
239 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
240
241 /* setup buffing BIO */
242 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
243
244 /* don't push the buffering BIO quite yet */
245
246 s->state=SSL3_ST_CW_CLNT_HELLO_A;
247 s->ctx->stats.sess_connect++;
248 s->init_num=0;
249 /* mark client_random uninitialized */
250 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
251 s->d1->send_cookie = 0;
252 s->hit = 0;
253 break;
254
255 #ifndef OPENSSL_NO_SCTP
256 case DTLS1_SCTP_ST_CR_READ_SOCK:
257
258 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
259 {
260 s->s3->in_read_app_data=2;
261 s->rwstate=SSL_READING;
262 BIO_clear_retry_flags(SSL_get_rbio(s));
263 BIO_set_retry_read(SSL_get_rbio(s));
264 ret = -1;
265 goto end;
266 }
267
268 s->state=s->s3->tmp.next_state;
269 break;
270
271 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
272 /* read app data until dry event */
273
274 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
275 if (ret < 0) goto end;
276
277 if (ret == 0)
278 {
279 s->s3->in_read_app_data=2;
280 s->rwstate=SSL_READING;
281 BIO_clear_retry_flags(SSL_get_rbio(s));
282 BIO_set_retry_read(SSL_get_rbio(s));
283 ret = -1;
284 goto end;
285 }
286
287 s->state=s->d1->next_state;
288 break;
289 #endif
290
291 case SSL3_ST_CW_CLNT_HELLO_A:
292 case SSL3_ST_CW_CLNT_HELLO_B:
293
294 s->shutdown=0;
295
296 /* every DTLS ClientHello resets Finished MAC */
297 ssl3_init_finished_mac(s);
298
299 dtls1_start_timer(s);
300 ret=dtls1_client_hello(s);
301 if (ret <= 0) goto end;
302
303 if ( s->d1->send_cookie)
304 {
305 s->state=SSL3_ST_CW_FLUSH;
306 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
307 }
308 else
309 s->state=SSL3_ST_CR_SRVR_HELLO_A;
310
311 s->init_num=0;
312
313 #ifndef OPENSSL_NO_SCTP
314 /* Disable buffering for SCTP */
315 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
316 {
317 #endif
318 /* turn on buffering for the next lot of output */
319 if (s->bbio != s->wbio)
320 s->wbio=BIO_push(s->bbio,s->wbio);
321 #ifndef OPENSSL_NO_SCTP
322 }
323 #endif
324
325 break;
326
327 case SSL3_ST_CR_SRVR_HELLO_A:
328 case SSL3_ST_CR_SRVR_HELLO_B:
329 ret=ssl3_get_server_hello(s);
330 if (ret <= 0) goto end;
331 else
332 {
333 dtls1_stop_timer(s);
334 if (s->hit)
335 {
336 #ifndef OPENSSL_NO_SCTP
337 /* Add new shared key for SCTP-Auth,
338 * will be ignored if no SCTP used.
339 */
340 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
341 DTLS1_SCTP_AUTH_LABEL);
342
343 SSL_export_keying_material(s, sctpauthkey,
344 sizeof(sctpauthkey), labelbuffer,
345 sizeof(labelbuffer), NULL, 0, 0);
346
347 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
348 sizeof(sctpauthkey), sctpauthkey);
349 #endif
350
351 s->state=SSL3_ST_CR_FINISHED_A;
352 }
353 else
354 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
355 }
356 s->init_num=0;
357 break;
358
359 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
360 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
361
362 ret = dtls1_get_hello_verify(s);
363 if ( ret <= 0)
364 goto end;
365 dtls1_stop_timer(s);
366 if ( s->d1->send_cookie) /* start again, with a cookie */
367 s->state=SSL3_ST_CW_CLNT_HELLO_A;
368 else
369 s->state = SSL3_ST_CR_CERT_A;
370 s->init_num = 0;
371 break;
372
373 case SSL3_ST_CR_CERT_A:
374 case SSL3_ST_CR_CERT_B:
375 #ifndef OPENSSL_NO_TLSEXT
376 ret=ssl3_check_finished(s);
377 if (ret <= 0) goto end;
378 if (ret == 2)
379 {
380 s->hit = 1;
381 if (s->tlsext_ticket_expected)
382 s->state=SSL3_ST_CR_SESSION_TICKET_A;
383 else
384 s->state=SSL3_ST_CR_FINISHED_A;
385 s->init_num=0;
386 break;
387 }
388 #endif
389 /* Check if it is anon DH or PSK */
390 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
391 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
392 {
393 ret=ssl3_get_server_certificate(s);
394 if (ret <= 0) goto end;
395 #ifndef OPENSSL_NO_TLSEXT
396 if (s->tlsext_status_expected)
397 s->state=SSL3_ST_CR_CERT_STATUS_A;
398 else
399 s->state=SSL3_ST_CR_KEY_EXCH_A;
400 }
401 else
402 {
403 skip = 1;
404 s->state=SSL3_ST_CR_KEY_EXCH_A;
405 }
406 #else
407 }
408 else
409 skip=1;
410
411 s->state=SSL3_ST_CR_KEY_EXCH_A;
412 #endif
413 s->init_num=0;
414 break;
415
416 case SSL3_ST_CR_KEY_EXCH_A:
417 case SSL3_ST_CR_KEY_EXCH_B:
418 ret=ssl3_get_key_exchange(s);
419 if (ret <= 0) goto end;
420 s->state=SSL3_ST_CR_CERT_REQ_A;
421 s->init_num=0;
422
423 /* at this point we check that we have the
424 * required stuff from the server */
425 if (!ssl3_check_cert_and_algorithm(s))
426 {
427 ret= -1;
428 goto end;
429 }
430 break;
431
432 case SSL3_ST_CR_CERT_REQ_A:
433 case SSL3_ST_CR_CERT_REQ_B:
434 ret=ssl3_get_certificate_request(s);
435 if (ret <= 0) goto end;
436 s->state=SSL3_ST_CR_SRVR_DONE_A;
437 s->init_num=0;
438 break;
439
440 case SSL3_ST_CR_SRVR_DONE_A:
441 case SSL3_ST_CR_SRVR_DONE_B:
442 ret=ssl3_get_server_done(s);
443 if (ret <= 0) goto end;
444 if (s->s3->tmp.cert_req)
445 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
446 else
447 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
448 s->init_num=0;
449
450 #ifndef OPENSSL_NO_SCTP
451 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
452 state == SSL_ST_RENEGOTIATE)
453 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
454 else
455 #endif
456 s->state=s->s3->tmp.next_state;
457 break;
458
459 case SSL3_ST_CW_CERT_A:
460 case SSL3_ST_CW_CERT_B:
461 case SSL3_ST_CW_CERT_C:
462 case SSL3_ST_CW_CERT_D:
463 dtls1_start_timer(s);
464 ret=dtls1_send_client_certificate(s);
465 if (ret <= 0) goto end;
466 s->state=SSL3_ST_CW_KEY_EXCH_A;
467 s->init_num=0;
468 break;
469
470 case SSL3_ST_CW_KEY_EXCH_A:
471 case SSL3_ST_CW_KEY_EXCH_B:
472 dtls1_start_timer(s);
473 ret=dtls1_send_client_key_exchange(s);
474 if (ret <= 0) goto end;
475
476 #ifndef OPENSSL_NO_SCTP
477 /* Add new shared key for SCTP-Auth,
478 * will be ignored if no SCTP used.
479 */
480 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
481 DTLS1_SCTP_AUTH_LABEL);
482
483 SSL_export_keying_material(s, sctpauthkey,
484 sizeof(sctpauthkey), labelbuffer,
485 sizeof(labelbuffer), NULL, 0, 0);
486
487 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
488 sizeof(sctpauthkey), sctpauthkey);
489 #endif
490
491 /* EAY EAY EAY need to check for DH fix cert
492 * sent back */
493 /* For TLS, cert_req is set to 2, so a cert chain
494 * of nothing is sent, but no verify packet is sent */
495 if (s->s3->tmp.cert_req == 1)
496 {
497 s->state=SSL3_ST_CW_CERT_VRFY_A;
498 }
499 else
500 {
501 #ifndef OPENSSL_NO_SCTP
502 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
503 {
504 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
505 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
506 }
507 else
508 #endif
509 s->state=SSL3_ST_CW_CHANGE_A;
510 s->s3->change_cipher_spec=0;
511 }
512
513 s->init_num=0;
514 break;
515
516 case SSL3_ST_CW_CERT_VRFY_A:
517 case SSL3_ST_CW_CERT_VRFY_B:
518 dtls1_start_timer(s);
519 ret=dtls1_send_client_verify(s);
520 if (ret <= 0) goto end;
521 #ifndef OPENSSL_NO_SCTP
522 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
523 {
524 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
525 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
526 }
527 else
528 #endif
529 s->state=SSL3_ST_CW_CHANGE_A;
530 s->init_num=0;
531 s->s3->change_cipher_spec=0;
532 break;
533
534 case SSL3_ST_CW_CHANGE_A:
535 case SSL3_ST_CW_CHANGE_B:
536 if (!s->hit)
537 dtls1_start_timer(s);
538 ret=dtls1_send_change_cipher_spec(s,
539 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
540 if (ret <= 0) goto end;
541
542 #ifndef OPENSSL_NO_SCTP
543 /* Change to new shared key of SCTP-Auth,
544 * will be ignored if no SCTP used.
545 */
546 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
547 #endif
548
549 s->state=SSL3_ST_CW_FINISHED_A;
550 s->init_num=0;
551
552 s->session->cipher=s->s3->tmp.new_cipher;
553 #ifdef OPENSSL_NO_COMP
554 s->session->compress_meth=0;
555 #else
556 if (s->s3->tmp.new_compression == NULL)
557 s->session->compress_meth=0;
558 else
559 s->session->compress_meth=
560 s->s3->tmp.new_compression->id;
561 #endif
562 if (!s->method->ssl3_enc->setup_key_block(s))
563 {
564 ret= -1;
565 goto end;
566 }
567
568 if (!s->method->ssl3_enc->change_cipher_state(s,
569 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
570 {
571 ret= -1;
572 goto end;
573 }
574
575 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
576 break;
577
578 case SSL3_ST_CW_FINISHED_A:
579 case SSL3_ST_CW_FINISHED_B:
580 if (!s->hit)
581 dtls1_start_timer(s);
582 ret=dtls1_send_finished(s,
583 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
584 s->method->ssl3_enc->client_finished_label,
585 s->method->ssl3_enc->client_finished_label_len);
586 if (ret <= 0) goto end;
587 s->state=SSL3_ST_CW_FLUSH;
588
589 /* clear flags */
590 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
591 if (s->hit)
592 {
593 s->s3->tmp.next_state=SSL_ST_OK;
594 #ifndef OPENSSL_NO_SCTP
595 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
596 {
597 s->d1->next_state = s->s3->tmp.next_state;
598 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
599 }
600 #endif
601 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
602 {
603 s->state=SSL_ST_OK;
604 #ifndef OPENSSL_NO_SCTP
605 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
606 {
607 s->d1->next_state = SSL_ST_OK;
608 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
609 }
610 #endif
611 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
612 s->s3->delay_buf_pop_ret=0;
613 }
614 }
615 else
616 {
617 #ifndef OPENSSL_NO_TLSEXT
618 /* Allow NewSessionTicket if ticket expected */
619 if (s->tlsext_ticket_expected)
620 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
621 else
622 #endif
623
624 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
625 }
626 s->init_num=0;
627 break;
628
629 #ifndef OPENSSL_NO_TLSEXT
630 case SSL3_ST_CR_SESSION_TICKET_A:
631 case SSL3_ST_CR_SESSION_TICKET_B:
632 ret=ssl3_get_new_session_ticket(s);
633 if (ret <= 0) goto end;
634 s->state=SSL3_ST_CR_FINISHED_A;
635 s->init_num=0;
636 break;
637
638 case SSL3_ST_CR_CERT_STATUS_A:
639 case SSL3_ST_CR_CERT_STATUS_B:
640 ret=ssl3_get_cert_status(s);
641 if (ret <= 0) goto end;
642 s->state=SSL3_ST_CR_KEY_EXCH_A;
643 s->init_num=0;
644 break;
645 #endif
646
647 case SSL3_ST_CR_FINISHED_A:
648 case SSL3_ST_CR_FINISHED_B:
649 s->d1->change_cipher_spec_ok = 1;
650 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
651 SSL3_ST_CR_FINISHED_B);
652 if (ret <= 0) goto end;
653 dtls1_stop_timer(s);
654
655 if (s->hit)
656 s->state=SSL3_ST_CW_CHANGE_A;
657 else
658 s->state=SSL_ST_OK;
659
660 #ifndef OPENSSL_NO_SCTP
661 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
662 state == SSL_ST_RENEGOTIATE)
663 {
664 s->d1->next_state=s->state;
665 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
666 }
667 #endif
668
669 s->init_num=0;
670 break;
671
672 case SSL3_ST_CW_FLUSH:
673 s->rwstate=SSL_WRITING;
674 if (BIO_flush(s->wbio) <= 0)
675 {
676 /* If the write error was fatal, stop trying */
677 if (!BIO_should_retry(s->wbio))
678 {
679 s->rwstate=SSL_NOTHING;
680 s->state=s->s3->tmp.next_state;
681 }
682
683 ret= -1;
684 goto end;
685 }
686 s->rwstate=SSL_NOTHING;
687 s->state=s->s3->tmp.next_state;
688 break;
689
690 case SSL_ST_OK:
691 /* clean a few things up */
692 ssl3_cleanup_key_block(s);
693
694 #if 0
695 if (s->init_buf != NULL)
696 {
697 BUF_MEM_free(s->init_buf);
698 s->init_buf=NULL;
699 }
700 #endif
701
702 /* If we are not 'joining' the last two packets,
703 * remove the buffering now */
704 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
705 ssl_free_wbio_buffer(s);
706 /* else do it later in ssl3_write */
707
708 s->init_num=0;
709 s->renegotiate=0;
710 s->new_session=0;
711
712 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
713 if (s->hit) s->ctx->stats.sess_hit++;
714
715 ret=1;
716 /* s->server=0; */
717 s->handshake_func=dtls1_connect;
718 s->ctx->stats.sess_connect_good++;
719
720 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
721
722 /* done with handshaking */
723 s->d1->handshake_read_seq = 0;
724 s->d1->next_handshake_write_seq = 0;
725 goto end;
726 /* break; */
727
728 default:
729 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
730 ret= -1;
731 goto end;
732 /* break; */
733 }
734
735 /* did we do anything */
736 if (!s->s3->tmp.reuse_message && !skip)
737 {
738 if (s->debug)
739 {
740 if ((ret=BIO_flush(s->wbio)) <= 0)
741 goto end;
742 }
743
744 if ((cb != NULL) && (s->state != state))
745 {
746 new_state=s->state;
747 s->state=state;
748 cb(s,SSL_CB_CONNECT_LOOP,1);
749 s->state=new_state;
750 }
751 }
752 skip=0;
753 }
754 end:
755 s->in_handshake--;
756
757 #ifndef OPENSSL_NO_SCTP
758 /* Notify SCTP BIO socket to leave handshake
759 * mode and allow stream identifier other
760 * than 0. Will be ignored if no SCTP is used.
761 */
762 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
763 #endif
764
765 if (buf != NULL)
766 BUF_MEM_free(buf);
767 if (cb != NULL)
768 cb(s,SSL_CB_CONNECT_EXIT,ret);
769 return(ret);
770 }
771
772 int dtls1_client_hello(SSL *s)
773 {
774 unsigned char *buf;
775 unsigned char *p,*d;
776 unsigned int i,j;
777 unsigned long Time,l;
778 SSL_COMP *comp;
779
780 buf=(unsigned char *)s->init_buf->data;
781 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
782 {
783 SSL_SESSION *sess = s->session;
784 if ((s->session == NULL) ||
785 (s->session->ssl_version != s->version) ||
786 #ifdef OPENSSL_NO_TLSEXT
787 !sess->session_id_length ||
788 #else
789 (!sess->session_id_length && !sess->tlsext_tick) ||
790 #endif
791 (s->session->not_resumable))
792 {
793 if (!ssl_get_new_session(s,0))
794 goto err;
795 }
796 /* else use the pre-loaded session */
797
798 p=s->s3->client_random;
799
800 /* if client_random is initialized, reuse it, we are
801 * required to use same upon reply to HelloVerify */
802 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
803 if (i==sizeof(s->s3->client_random))
804 {
805 Time=(unsigned long)time(NULL); /* Time */
806 l2n(Time,p);
807 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
808 }
809
810 /* Do the message type and length last */
811 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
812
813 *(p++)=s->version>>8;
814 *(p++)=s->version&0xff;
815 s->client_version=s->version;
816
817 /* Random stuff */
818 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
819 p+=SSL3_RANDOM_SIZE;
820
821 /* Session ID */
822 if (s->new_session)
823 i=0;
824 else
825 i=s->session->session_id_length;
826 *(p++)=i;
827 if (i != 0)
828 {
829 if (i > sizeof s->session->session_id)
830 {
831 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
832 goto err;
833 }
834 memcpy(p,s->session->session_id,i);
835 p+=i;
836 }
837
838 /* cookie stuff */
839 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
840 {
841 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
842 goto err;
843 }
844 *(p++) = s->d1->cookie_len;
845 memcpy(p, s->d1->cookie, s->d1->cookie_len);
846 p += s->d1->cookie_len;
847
848 /* Ciphers supported */
849 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
850 if (i == 0)
851 {
852 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
853 goto err;
854 }
855 s2n(i,p);
856 p+=i;
857
858 /* COMPRESSION */
859 if (s->ctx->comp_methods == NULL)
860 j=0;
861 else
862 j=sk_SSL_COMP_num(s->ctx->comp_methods);
863 *(p++)=1+j;
864 for (i=0; i<j; i++)
865 {
866 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
867 *(p++)=comp->id;
868 }
869 *(p++)=0; /* Add the NULL method */
870
871 #ifndef OPENSSL_NO_TLSEXT
872 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
873 {
874 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
875 goto err;
876 }
877 #endif
878
879 l=(p-d);
880 d=buf;
881
882 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
883
884 s->state=SSL3_ST_CW_CLNT_HELLO_B;
885 /* number of bytes to write */
886 s->init_num=p-buf;
887 s->init_off=0;
888
889 /* buffer the message to handle re-xmits */
890 dtls1_buffer_message(s, 0);
891 }
892
893 /* SSL3_ST_CW_CLNT_HELLO_B */
894 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
895 err:
896 return(-1);
897 }
898
899 static int dtls1_get_hello_verify(SSL *s)
900 {
901 int n, al, ok = 0;
902 unsigned char *data;
903 unsigned int cookie_len;
904
905 n=s->method->ssl_get_message(s,
906 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
907 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
908 -1,
909 s->max_cert_list,
910 &ok);
911
912 if (!ok) return((int)n);
913
914 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
915 {
916 s->d1->send_cookie = 0;
917 s->s3->tmp.reuse_message=1;
918 return(1);
919 }
920
921 data = (unsigned char *)s->init_msg;
922
923 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
924 {
925 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
926 s->version=(s->version&0xff00)|data[1];
927 al = SSL_AD_PROTOCOL_VERSION;
928 goto f_err;
929 }
930 data+=2;
931
932 cookie_len = *(data++);
933 if ( cookie_len > sizeof(s->d1->cookie))
934 {
935 al=SSL_AD_ILLEGAL_PARAMETER;
936 goto f_err;
937 }
938
939 memcpy(s->d1->cookie, data, cookie_len);
940 s->d1->cookie_len = cookie_len;
941
942 s->d1->send_cookie = 1;
943 return 1;
944
945 f_err:
946 ssl3_send_alert(s, SSL3_AL_FATAL, al);
947 return -1;
948 }
949
950 int dtls1_send_client_key_exchange(SSL *s)
951 {
952 unsigned char *p,*d;
953 int n;
954 unsigned long alg_k;
955 #ifndef OPENSSL_NO_RSA
956 unsigned char *q;
957 EVP_PKEY *pkey=NULL;
958 #endif
959 #ifndef OPENSSL_NO_KRB5
960 KSSL_ERR kssl_err;
961 #endif /* OPENSSL_NO_KRB5 */
962 #ifndef OPENSSL_NO_ECDH
963 EC_KEY *clnt_ecdh = NULL;
964 const EC_POINT *srvr_ecpoint = NULL;
965 EVP_PKEY *srvr_pub_pkey = NULL;
966 unsigned char *encodedPoint = NULL;
967 int encoded_pt_len = 0;
968 BN_CTX * bn_ctx = NULL;
969 #endif
970
971 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
972 {
973 d=(unsigned char *)s->init_buf->data;
974 p= &(d[DTLS1_HM_HEADER_LENGTH]);
975
976 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
977
978 /* Fool emacs indentation */
979 if (0) {}
980 #ifndef OPENSSL_NO_RSA
981 else if (alg_k & SSL_kRSA)
982 {
983 RSA *rsa;
984 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
985
986 if (s->session->sess_cert->peer_rsa_tmp != NULL)
987 rsa=s->session->sess_cert->peer_rsa_tmp;
988 else
989 {
990 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
991 if ((pkey == NULL) ||
992 (pkey->type != EVP_PKEY_RSA) ||
993 (pkey->pkey.rsa == NULL))
994 {
995 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
996 goto err;
997 }
998 rsa=pkey->pkey.rsa;
999 EVP_PKEY_free(pkey);
1000 }
1001
1002 tmp_buf[0]=s->client_version>>8;
1003 tmp_buf[1]=s->client_version&0xff;
1004 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1005 goto err;
1006
1007 s->session->master_key_length=sizeof tmp_buf;
1008
1009 q=p;
1010 /* Fix buf for TLS and [incidentally] DTLS */
1011 if (s->version > SSL3_VERSION)
1012 p+=2;
1013 n=RSA_public_encrypt(sizeof tmp_buf,
1014 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1015 #ifdef PKCS1_CHECK
1016 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1017 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1018 #endif
1019 if (n <= 0)
1020 {
1021 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1022 goto err;
1023 }
1024
1025 /* Fix buf for TLS and [incidentally] DTLS */
1026 if (s->version > SSL3_VERSION)
1027 {
1028 s2n(n,q);
1029 n+=2;
1030 }
1031
1032 s->session->master_key_length=
1033 s->method->ssl3_enc->generate_master_secret(s,
1034 s->session->master_key,
1035 tmp_buf,sizeof tmp_buf);
1036 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1037 }
1038 #endif
1039 #ifndef OPENSSL_NO_KRB5
1040 else if (alg_k & SSL_kKRB5)
1041 {
1042 krb5_error_code krb5rc;
1043 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1044 /* krb5_data krb5_ap_req; */
1045 krb5_data *enc_ticket;
1046 krb5_data authenticator, *authp = NULL;
1047 EVP_CIPHER_CTX ciph_ctx;
1048 const EVP_CIPHER *enc = NULL;
1049 unsigned char iv[EVP_MAX_IV_LENGTH];
1050 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1051 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
1052 + EVP_MAX_IV_LENGTH];
1053 int padl, outl = sizeof(epms);
1054
1055 EVP_CIPHER_CTX_init(&ciph_ctx);
1056
1057 #ifdef KSSL_DEBUG
1058 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1059 alg_k, SSL_kKRB5);
1060 #endif /* KSSL_DEBUG */
1061
1062 authp = NULL;
1063 #ifdef KRB5SENDAUTH
1064 if (KRB5SENDAUTH) authp = &authenticator;
1065 #endif /* KRB5SENDAUTH */
1066
1067 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1068 &kssl_err);
1069 enc = kssl_map_enc(kssl_ctx->enctype);
1070 if (enc == NULL)
1071 goto err;
1072 #ifdef KSSL_DEBUG
1073 {
1074 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1075 if (krb5rc && kssl_err.text)
1076 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1077 }
1078 #endif /* KSSL_DEBUG */
1079
1080 if (krb5rc)
1081 {
1082 ssl3_send_alert(s,SSL3_AL_FATAL,
1083 SSL_AD_HANDSHAKE_FAILURE);
1084 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1085 kssl_err.reason);
1086 goto err;
1087 }
1088
1089 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
1090 ** in place of RFC 2712 KerberosWrapper, as in:
1091 **
1092 ** Send ticket (copy to *p, set n = length)
1093 ** n = krb5_ap_req.length;
1094 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1095 ** if (krb5_ap_req.data)
1096 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1097 **
1098 ** Now using real RFC 2712 KerberosWrapper
1099 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1100 ** Note: 2712 "opaque" types are here replaced
1101 ** with a 2-byte length followed by the value.
1102 ** Example:
1103 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1104 ** Where "xx xx" = length bytes. Shown here with
1105 ** optional authenticator omitted.
1106 */
1107
1108 /* KerberosWrapper.Ticket */
1109 s2n(enc_ticket->length,p);
1110 memcpy(p, enc_ticket->data, enc_ticket->length);
1111 p+= enc_ticket->length;
1112 n = enc_ticket->length + 2;
1113
1114 /* KerberosWrapper.Authenticator */
1115 if (authp && authp->length)
1116 {
1117 s2n(authp->length,p);
1118 memcpy(p, authp->data, authp->length);
1119 p+= authp->length;
1120 n+= authp->length + 2;
1121
1122 free(authp->data);
1123 authp->data = NULL;
1124 authp->length = 0;
1125 }
1126 else
1127 {
1128 s2n(0,p);/* null authenticator length */
1129 n+=2;
1130 }
1131
1132 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1133 goto err;
1134
1135 /* 20010420 VRS. Tried it this way; failed.
1136 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1137 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1138 ** kssl_ctx->length);
1139 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1140 */
1141
1142 memset(iv, 0, sizeof iv); /* per RFC 1510 */
1143 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1144 kssl_ctx->key,iv);
1145 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1146 sizeof tmp_buf);
1147 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1148 outl += padl;
1149 if (outl > (int)sizeof epms)
1150 {
1151 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1152 goto err;
1153 }
1154 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1155
1156 /* KerberosWrapper.EncryptedPreMasterSecret */
1157 s2n(outl,p);
1158 memcpy(p, epms, outl);
1159 p+=outl;
1160 n+=outl + 2;
1161
1162 s->session->master_key_length=
1163 s->method->ssl3_enc->generate_master_secret(s,
1164 s->session->master_key,
1165 tmp_buf, sizeof tmp_buf);
1166
1167 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1168 OPENSSL_cleanse(epms, outl);
1169 }
1170 #endif
1171 #ifndef OPENSSL_NO_DH
1172 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1173 {
1174 DH *dh_srvr,*dh_clnt;
1175
1176 if (s->session->sess_cert->peer_dh_tmp != NULL)
1177 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1178 else
1179 {
1180 /* we get them from the cert */
1181 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1182 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1183 goto err;
1184 }
1185
1186 /* generate a new random key */
1187 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1188 {
1189 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1190 goto err;
1191 }
1192 if (!DH_generate_key(dh_clnt))
1193 {
1194 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1195 goto err;
1196 }
1197
1198 /* use the 'p' output buffer for the DH key, but
1199 * make sure to clear it out afterwards */
1200
1201 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1202
1203 if (n <= 0)
1204 {
1205 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1206 goto err;
1207 }
1208
1209 /* generate master key from the result */
1210 s->session->master_key_length=
1211 s->method->ssl3_enc->generate_master_secret(s,
1212 s->session->master_key,p,n);
1213 /* clean up */
1214 memset(p,0,n);
1215
1216 /* send off the data */
1217 n=BN_num_bytes(dh_clnt->pub_key);
1218 s2n(n,p);
1219 BN_bn2bin(dh_clnt->pub_key,p);
1220 n+=2;
1221
1222 DH_free(dh_clnt);
1223
1224 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1225 }
1226 #endif
1227 #ifndef OPENSSL_NO_ECDH
1228 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1229 {
1230 const EC_GROUP *srvr_group = NULL;
1231 EC_KEY *tkey;
1232 int ecdh_clnt_cert = 0;
1233 int field_size = 0;
1234
1235 /* Did we send out the client's
1236 * ECDH share for use in premaster
1237 * computation as part of client certificate?
1238 * If so, set ecdh_clnt_cert to 1.
1239 */
1240 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1241 {
1242 /* XXX: For now, we do not support client
1243 * authentication using ECDH certificates.
1244 * To add such support, one needs to add
1245 * code that checks for appropriate
1246 * conditions and sets ecdh_clnt_cert to 1.
1247 * For example, the cert have an ECC
1248 * key on the same curve as the server's
1249 * and the key should be authorized for
1250 * key agreement.
1251 *
1252 * One also needs to add code in ssl3_connect
1253 * to skip sending the certificate verify
1254 * message.
1255 *
1256 * if ((s->cert->key->privatekey != NULL) &&
1257 * (s->cert->key->privatekey->type ==
1258 * EVP_PKEY_EC) && ...)
1259 * ecdh_clnt_cert = 1;
1260 */
1261 }
1262
1263 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1264 {
1265 tkey = s->session->sess_cert->peer_ecdh_tmp;
1266 }
1267 else
1268 {
1269 /* Get the Server Public Key from Cert */
1270 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1271 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1272 if ((srvr_pub_pkey == NULL) ||
1273 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1274 (srvr_pub_pkey->pkey.ec == NULL))
1275 {
1276 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1277 ERR_R_INTERNAL_ERROR);
1278 goto err;
1279 }
1280
1281 tkey = srvr_pub_pkey->pkey.ec;
1282 }
1283
1284 srvr_group = EC_KEY_get0_group(tkey);
1285 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1286
1287 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1288 {
1289 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1290 ERR_R_INTERNAL_ERROR);
1291 goto err;
1292 }
1293
1294 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1295 {
1296 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1297 goto err;
1298 }
1299
1300 if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1301 {
1302 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1303 goto err;
1304 }
1305 if (ecdh_clnt_cert)
1306 {
1307 /* Reuse key info from our certificate
1308 * We only need our private key to perform
1309 * the ECDH computation.
1310 */
1311 const BIGNUM *priv_key;
1312 tkey = s->cert->key->privatekey->pkey.ec;
1313 priv_key = EC_KEY_get0_private_key(tkey);
1314 if (priv_key == NULL)
1315 {
1316 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1317 goto err;
1318 }
1319 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1320 {
1321 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1322 goto err;
1323 }
1324 }
1325 else
1326 {
1327 /* Generate a new ECDH key pair */
1328 if (!(EC_KEY_generate_key(clnt_ecdh)))
1329 {
1330 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1331 goto err;
1332 }
1333 }
1334
1335 /* use the 'p' output buffer for the ECDH key, but
1336 * make sure to clear it out afterwards
1337 */
1338
1339 field_size = EC_GROUP_get_degree(srvr_group);
1340 if (field_size <= 0)
1341 {
1342 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1343 ERR_R_ECDH_LIB);
1344 goto err;
1345 }
1346 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1347 if (n <= 0)
1348 {
1349 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1350 ERR_R_ECDH_LIB);
1351 goto err;
1352 }
1353
1354 /* generate master key from the result */
1355 s->session->master_key_length = s->method->ssl3_enc \
1356 -> generate_master_secret(s,
1357 s->session->master_key,
1358 p, n);
1359
1360 memset(p, 0, n); /* clean up */
1361
1362 if (ecdh_clnt_cert)
1363 {
1364 /* Send empty client key exch message */
1365 n = 0;
1366 }
1367 else
1368 {
1369 /* First check the size of encoding and
1370 * allocate memory accordingly.
1371 */
1372 encoded_pt_len =
1373 EC_POINT_point2oct(srvr_group,
1374 EC_KEY_get0_public_key(clnt_ecdh),
1375 POINT_CONVERSION_UNCOMPRESSED,
1376 NULL, 0, NULL);
1377
1378 encodedPoint = (unsigned char *)
1379 OPENSSL_malloc(encoded_pt_len *
1380 sizeof(unsigned char));
1381 bn_ctx = BN_CTX_new();
1382 if ((encodedPoint == NULL) ||
1383 (bn_ctx == NULL))
1384 {
1385 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1386 goto err;
1387 }
1388
1389 /* Encode the public key */
1390 n = EC_POINT_point2oct(srvr_group,
1391 EC_KEY_get0_public_key(clnt_ecdh),
1392 POINT_CONVERSION_UNCOMPRESSED,
1393 encodedPoint, encoded_pt_len, bn_ctx);
1394
1395 *p = n; /* length of encoded point */
1396 /* Encoded point will be copied here */
1397 p += 1;
1398 /* copy the point */
1399 memcpy((unsigned char *)p, encodedPoint, n);
1400 /* increment n to account for length field */
1401 n += 1;
1402 }
1403
1404 /* Free allocated memory */
1405 BN_CTX_free(bn_ctx);
1406 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1407 if (clnt_ecdh != NULL)
1408 EC_KEY_free(clnt_ecdh);
1409 EVP_PKEY_free(srvr_pub_pkey);
1410 }
1411 #endif /* !OPENSSL_NO_ECDH */
1412
1413 #ifndef OPENSSL_NO_PSK
1414 else if (alg_k & SSL_kPSK)
1415 {
1416 char identity[PSK_MAX_IDENTITY_LEN];
1417 unsigned char *t = NULL;
1418 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1419 unsigned int pre_ms_len = 0, psk_len = 0;
1420 int psk_err = 1;
1421
1422 n = 0;
1423 if (s->psk_client_callback == NULL)
1424 {
1425 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1426 SSL_R_PSK_NO_CLIENT_CB);
1427 goto err;
1428 }
1429
1430 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1431 identity, PSK_MAX_IDENTITY_LEN,
1432 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1433 if (psk_len > PSK_MAX_PSK_LEN)
1434 {
1435 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1436 ERR_R_INTERNAL_ERROR);
1437 goto psk_err;
1438 }
1439 else if (psk_len == 0)
1440 {
1441 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1442 SSL_R_PSK_IDENTITY_NOT_FOUND);
1443 goto psk_err;
1444 }
1445
1446 /* create PSK pre_master_secret */
1447 pre_ms_len = 2+psk_len+2+psk_len;
1448 t = psk_or_pre_ms;
1449 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1450 s2n(psk_len, t);
1451 memset(t, 0, psk_len);
1452 t+=psk_len;
1453 s2n(psk_len, t);
1454
1455 if (s->session->psk_identity_hint != NULL)
1456 OPENSSL_free(s->session->psk_identity_hint);
1457 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1458 if (s->ctx->psk_identity_hint != NULL &&
1459 s->session->psk_identity_hint == NULL)
1460 {
1461 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1462 ERR_R_MALLOC_FAILURE);
1463 goto psk_err;
1464 }
1465
1466 if (s->session->psk_identity != NULL)
1467 OPENSSL_free(s->session->psk_identity);
1468 s->session->psk_identity = BUF_strdup(identity);
1469 if (s->session->psk_identity == NULL)
1470 {
1471 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1472 ERR_R_MALLOC_FAILURE);
1473 goto psk_err;
1474 }
1475
1476 s->session->master_key_length =
1477 s->method->ssl3_enc->generate_master_secret(s,
1478 s->session->master_key,
1479 psk_or_pre_ms, pre_ms_len);
1480 n = strlen(identity);
1481 s2n(n, p);
1482 memcpy(p, identity, n);
1483 n+=2;
1484 psk_err = 0;
1485 psk_err:
1486 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1487 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1488 if (psk_err != 0)
1489 {
1490 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1491 goto err;
1492 }
1493 }
1494 #endif
1495 else
1496 {
1497 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1498 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1499 goto err;
1500 }
1501
1502 d = dtls1_set_message_header(s, d,
1503 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1504 /*
1505 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1506 l2n3(n,d);
1507 l2n(s->d1->handshake_write_seq,d);
1508 s->d1->handshake_write_seq++;
1509 */
1510
1511 s->state=SSL3_ST_CW_KEY_EXCH_B;
1512 /* number of bytes to write */
1513 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1514 s->init_off=0;
1515
1516 /* buffer the message to handle re-xmits */
1517 dtls1_buffer_message(s, 0);
1518 }
1519
1520 /* SSL3_ST_CW_KEY_EXCH_B */
1521 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1522 err:
1523 #ifndef OPENSSL_NO_ECDH
1524 BN_CTX_free(bn_ctx);
1525 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1526 if (clnt_ecdh != NULL)
1527 EC_KEY_free(clnt_ecdh);
1528 EVP_PKEY_free(srvr_pub_pkey);
1529 #endif
1530 return(-1);
1531 }
1532
1533 int dtls1_send_client_verify(SSL *s)
1534 {
1535 unsigned char *p,*d;
1536 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1537 EVP_PKEY *pkey;
1538 #ifndef OPENSSL_NO_RSA
1539 unsigned u=0;
1540 #endif
1541 unsigned long n;
1542 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1543 int j;
1544 #endif
1545
1546 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1547 {
1548 d=(unsigned char *)s->init_buf->data;
1549 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1550 pkey=s->cert->key->privatekey;
1551
1552 s->method->ssl3_enc->cert_verify_mac(s,
1553 NID_sha1,
1554 &(data[MD5_DIGEST_LENGTH]));
1555
1556 #ifndef OPENSSL_NO_RSA
1557 if (pkey->type == EVP_PKEY_RSA)
1558 {
1559 s->method->ssl3_enc->cert_verify_mac(s,
1560 NID_md5,
1561 &(data[0]));
1562 if (RSA_sign(NID_md5_sha1, data,
1563 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1564 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1565 {
1566 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1567 goto err;
1568 }
1569 s2n(u,p);
1570 n=u+2;
1571 }
1572 else
1573 #endif
1574 #ifndef OPENSSL_NO_DSA
1575 if (pkey->type == EVP_PKEY_DSA)
1576 {
1577 if (!DSA_sign(pkey->save_type,
1578 &(data[MD5_DIGEST_LENGTH]),
1579 SHA_DIGEST_LENGTH,&(p[2]),
1580 (unsigned int *)&j,pkey->pkey.dsa))
1581 {
1582 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1583 goto err;
1584 }
1585 s2n(j,p);
1586 n=j+2;
1587 }
1588 else
1589 #endif
1590 #ifndef OPENSSL_NO_ECDSA
1591 if (pkey->type == EVP_PKEY_EC)
1592 {
1593 if (!ECDSA_sign(pkey->save_type,
1594 &(data[MD5_DIGEST_LENGTH]),
1595 SHA_DIGEST_LENGTH,&(p[2]),
1596 (unsigned int *)&j,pkey->pkey.ec))
1597 {
1598 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1599 ERR_R_ECDSA_LIB);
1600 goto err;
1601 }
1602 s2n(j,p);
1603 n=j+2;
1604 }
1605 else
1606 #endif
1607 {
1608 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1609 goto err;
1610 }
1611
1612 d = dtls1_set_message_header(s, d,
1613 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1614
1615 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1616 s->init_off=0;
1617
1618 /* buffer the message to handle re-xmits */
1619 dtls1_buffer_message(s, 0);
1620
1621 s->state = SSL3_ST_CW_CERT_VRFY_B;
1622 }
1623
1624 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1625 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1626 err:
1627 return(-1);
1628 }
1629
1630 int dtls1_send_client_certificate(SSL *s)
1631 {
1632 X509 *x509=NULL;
1633 EVP_PKEY *pkey=NULL;
1634 int i;
1635 unsigned long l;
1636
1637 if (s->state == SSL3_ST_CW_CERT_A)
1638 {
1639 if ((s->cert == NULL) ||
1640 (s->cert->key->x509 == NULL) ||
1641 (s->cert->key->privatekey == NULL))
1642 s->state=SSL3_ST_CW_CERT_B;
1643 else
1644 s->state=SSL3_ST_CW_CERT_C;
1645 }
1646
1647 /* We need to get a client cert */
1648 if (s->state == SSL3_ST_CW_CERT_B)
1649 {
1650 /* If we get an error, we need to
1651 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1652 * We then get retied later */
1653 i=0;
1654 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1655 if (i < 0)
1656 {
1657 s->rwstate=SSL_X509_LOOKUP;
1658 return(-1);
1659 }
1660 s->rwstate=SSL_NOTHING;
1661 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1662 {
1663 s->state=SSL3_ST_CW_CERT_B;
1664 if ( !SSL_use_certificate(s,x509) ||
1665 !SSL_use_PrivateKey(s,pkey))
1666 i=0;
1667 }
1668 else if (i == 1)
1669 {
1670 i=0;
1671 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1672 }
1673
1674 if (x509 != NULL) X509_free(x509);
1675 if (pkey != NULL) EVP_PKEY_free(pkey);
1676 if (i == 0)
1677 {
1678 if (s->version == SSL3_VERSION)
1679 {
1680 s->s3->tmp.cert_req=0;
1681 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1682 return(1);
1683 }
1684 else
1685 {
1686 s->s3->tmp.cert_req=2;
1687 }
1688 }
1689
1690 /* Ok, we have a cert */
1691 s->state=SSL3_ST_CW_CERT_C;
1692 }
1693
1694 if (s->state == SSL3_ST_CW_CERT_C)
1695 {
1696 s->state=SSL3_ST_CW_CERT_D;
1697 l=dtls1_output_cert_chain(s,
1698 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1699 s->init_num=(int)l;
1700 s->init_off=0;
1701
1702 /* set header called by dtls1_output_cert_chain() */
1703
1704 /* buffer the message to handle re-xmits */
1705 dtls1_buffer_message(s, 0);
1706 }
1707 /* SSL3_ST_CW_CERT_D */
1708 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1709 }
1710
1711
A mirror of the official openssl repository