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etc/services - sync with NetBSD-8
[minix.git] / crypto / external / bsd / openssl / dist / ssl / d1_clnt.c
blob377c1e61f75ceda0c6b72d099a8a595af06d44c9
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, dtls1_get_client_method)
145
146 int dtls1_connect(SSL *s)
147 {
148 BUF_MEM *buf = NULL;
149 unsigned long Time = (unsigned long)time(NULL);
150 void (*cb) (const SSL *ssl, int type, int val) = NULL;
151 int ret = -1;
152 int new_state, state, skip = 0;
153 #ifndef OPENSSL_NO_SCTP
154 unsigned char sctpauthkey[64];
155 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
156 #endif
157
158 RAND_add(&Time, sizeof(Time), 0);
159 ERR_clear_error();
160 clear_sys_error();
161
162 if (s->info_callback != NULL)
163 cb = s->info_callback;
164 else if (s->ctx->info_callback != NULL)
165 cb = s->ctx->info_callback;
166
167 s->in_handshake++;
168 if (!SSL_in_init(s) || SSL_in_before(s))
169 SSL_clear(s);
170
171 #ifndef OPENSSL_NO_SCTP
172 /*
173 * Notify SCTP BIO socket to enter handshake mode and prevent stream
174 * identifier other 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,
177 s->in_handshake, NULL);
178 #endif
179
180 #ifndef OPENSSL_NO_HEARTBEATS
181 /*
182 * If we're awaiting a HeartbeatResponse, pretend we already got and
183 * don't await it anymore, because Heartbeats don't make sense during
184 * handshakes anyway.
185 */
186 if (s->tlsext_hb_pending) {
187 dtls1_stop_timer(s);
188 s->tlsext_hb_pending = 0;
189 s->tlsext_hb_seq++;
190 }
191 #endif
192
193 for (;;) {
194 state = s->state;
195
196 switch (s->state) {
197 case SSL_ST_RENEGOTIATE:
198 s->renegotiate = 1;
199 s->state = SSL_ST_CONNECT;
200 s->ctx->stats.sess_connect_renegotiate++;
201 /* break */
202 case SSL_ST_BEFORE:
203 case SSL_ST_CONNECT:
204 case SSL_ST_BEFORE | SSL_ST_CONNECT:
205 case SSL_ST_OK | SSL_ST_CONNECT:
206
207 s->server = 0;
208 if (cb != NULL)
209 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 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
214 ret = -1;
215 s->state = SSL_ST_ERR;
216 goto end;
217 }
218
219 /* s->version=SSL3_VERSION; */
220 s->type = SSL_ST_CONNECT;
221
222 if (s->init_buf == NULL) {
223 if ((buf = BUF_MEM_new()) == NULL) {
224 ret = -1;
225 s->state = SSL_ST_ERR;
226 goto end;
227 }
228 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
229 ret = -1;
230 s->state = SSL_ST_ERR;
231 goto end;
232 }
233 s->init_buf = buf;
234 buf = NULL;
235 }
236
237 if (!ssl3_setup_buffers(s)) {
238 ret = -1;
239 s->state = SSL_ST_ERR;
240 goto end;
241 }
242
243 /* setup buffing BIO */
244 if (!ssl_init_wbio_buffer(s, 0)) {
245 ret = -1;
246 s->state = SSL_ST_ERR;
247 goto end;
248 }
249
250 /* don't push the buffering BIO quite yet */
251
252 s->state = SSL3_ST_CW_CLNT_HELLO_A;
253 s->ctx->stats.sess_connect++;
254 s->init_num = 0;
255 /* mark client_random uninitialized */
256 memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
257 s->d1->send_cookie = 0;
258 s->hit = 0;
259 s->d1->change_cipher_spec_ok = 0;
260 /*
261 * Should have been reset by ssl3_get_finished, too.
262 */
263 s->s3->change_cipher_spec = 0;
264 break;
265
266 #ifndef OPENSSL_NO_SCTP
267 case DTLS1_SCTP_ST_CR_READ_SOCK:
268
269 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
270 s->s3->in_read_app_data = 2;
271 s->rwstate = SSL_READING;
272 BIO_clear_retry_flags(SSL_get_rbio(s));
273 BIO_set_retry_read(SSL_get_rbio(s));
274 ret = -1;
275 goto end;
276 }
277
278 s->state = s->s3->tmp.next_state;
279 break;
280
281 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
282 /* read app data until dry event */
283
284 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
285 if (ret < 0)
286 goto end;
287
288 if (ret == 0) {
289 s->s3->in_read_app_data = 2;
290 s->rwstate = SSL_READING;
291 BIO_clear_retry_flags(SSL_get_rbio(s));
292 BIO_set_retry_read(SSL_get_rbio(s));
293 ret = -1;
294 goto end;
295 }
296
297 s->state = s->d1->next_state;
298 break;
299 #endif
300
301 case SSL3_ST_CW_CLNT_HELLO_A:
302 case SSL3_ST_CW_CLNT_HELLO_B:
303
304 s->shutdown = 0;
305
306 /* every DTLS ClientHello resets Finished MAC */
307 ssl3_init_finished_mac(s);
308
309 dtls1_start_timer(s);
310 ret = dtls1_client_hello(s);
311 if (ret <= 0)
312 goto end;
313
314 if (s->d1->send_cookie) {
315 s->state = SSL3_ST_CW_FLUSH;
316 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
317 } else
318 s->state = SSL3_ST_CR_SRVR_HELLO_A;
319
320 s->init_num = 0;
321
322 #ifndef OPENSSL_NO_SCTP
323 /* Disable buffering for SCTP */
324 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
325 #endif
326 /*
327 * turn on buffering for the next lot of output
328 */
329 if (s->bbio != s->wbio)
330 s->wbio = BIO_push(s->bbio, s->wbio);
331 #ifndef OPENSSL_NO_SCTP
332 }
333 #endif
334
335 break;
336
337 case SSL3_ST_CR_SRVR_HELLO_A:
338 case SSL3_ST_CR_SRVR_HELLO_B:
339 ret = ssl3_get_server_hello(s);
340 if (ret <= 0)
341 goto end;
342 else {
343 if (s->hit) {
344 #ifndef OPENSSL_NO_SCTP
345 /*
346 * Add new shared key for SCTP-Auth, will be ignored if
347 * no SCTP used.
348 */
349 snprintf((char *)labelbuffer,
350 sizeof(DTLS1_SCTP_AUTH_LABEL),
351 DTLS1_SCTP_AUTH_LABEL);
352
353 SSL_export_keying_material(s, sctpauthkey,
354 sizeof(sctpauthkey),
355 labelbuffer,
356 sizeof(labelbuffer), NULL, 0,
357 0);
358
359 BIO_ctrl(SSL_get_wbio(s),
360 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
361 sizeof(sctpauthkey), sctpauthkey);
362 #endif
363
364 s->state = SSL3_ST_CR_FINISHED_A;
365 } else
366 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
367 }
368 s->init_num = 0;
369 break;
370
371 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
372 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
373
374 ret = dtls1_get_hello_verify(s);
375 if (ret <= 0)
376 goto end;
377 dtls1_stop_timer(s);
378 if (s->d1->send_cookie) /* start again, with a cookie */
379 s->state = SSL3_ST_CW_CLNT_HELLO_A;
380 else
381 s->state = SSL3_ST_CR_CERT_A;
382 s->init_num = 0;
383 break;
384
385 case SSL3_ST_CR_CERT_A:
386 case SSL3_ST_CR_CERT_B:
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 ret = ssl3_get_server_certificate(s);
391 if (ret <= 0)
392 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 } else {
399 skip = 1;
400 s->state = SSL3_ST_CR_KEY_EXCH_A;
401 }
402 #else
403 } else
404 skip = 1;
405
406 s->state = SSL3_ST_CR_KEY_EXCH_A;
407 #endif
408 s->init_num = 0;
409 break;
410
411 case SSL3_ST_CR_KEY_EXCH_A:
412 case SSL3_ST_CR_KEY_EXCH_B:
413 ret = ssl3_get_key_exchange(s);
414 if (ret <= 0)
415 goto end;
416 s->state = SSL3_ST_CR_CERT_REQ_A;
417 s->init_num = 0;
418
419 /*
420 * at this point we check that we have the required stuff from
421 * the server
422 */
423 if (!ssl3_check_cert_and_algorithm(s)) {
424 ret = -1;
425 s->state = SSL_ST_ERR;
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)
434 goto end;
435 s->state = SSL3_ST_CR_SRVR_DONE_A;
436 s->init_num = 0;
437 break;
438
439 case SSL3_ST_CR_SRVR_DONE_A:
440 case SSL3_ST_CR_SRVR_DONE_B:
441 ret = ssl3_get_server_done(s);
442 if (ret <= 0)
443 goto end;
444 dtls1_stop_timer(s);
445 if (s->s3->tmp.cert_req)
446 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
447 else
448 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
449 s->init_num = 0;
450
451 #ifndef OPENSSL_NO_SCTP
452 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
453 state == SSL_ST_RENEGOTIATE)
454 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
455 else
456 #endif
457 s->state = s->s3->tmp.next_state;
458 break;
459
460 case SSL3_ST_CW_CERT_A:
461 case SSL3_ST_CW_CERT_B:
462 case SSL3_ST_CW_CERT_C:
463 case SSL3_ST_CW_CERT_D:
464 dtls1_start_timer(s);
465 ret = dtls1_send_client_certificate(s);
466 if (ret <= 0)
467 goto end;
468 s->state = SSL3_ST_CW_KEY_EXCH_A;
469 s->init_num = 0;
470 break;
471
472 case SSL3_ST_CW_KEY_EXCH_A:
473 case SSL3_ST_CW_KEY_EXCH_B:
474 dtls1_start_timer(s);
475 ret = dtls1_send_client_key_exchange(s);
476 if (ret <= 0)
477 goto end;
478
479 #ifndef OPENSSL_NO_SCTP
480 /*
481 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
482 * used.
483 */
484 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
485 DTLS1_SCTP_AUTH_LABEL);
486
487 SSL_export_keying_material(s, sctpauthkey,
488 sizeof(sctpauthkey), labelbuffer,
489 sizeof(labelbuffer), NULL, 0, 0);
490
491 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
492 sizeof(sctpauthkey), sctpauthkey);
493 #endif
494
495 /*
496 * EAY EAY EAY need to check for DH fix cert sent back
497 */
498 /*
499 * For TLS, cert_req is set to 2, so a cert chain of nothing is
500 * sent, but no verify packet is sent
501 */
502 if (s->s3->tmp.cert_req == 1) {
503 s->state = SSL3_ST_CW_CERT_VRFY_A;
504 } else {
505 #ifndef OPENSSL_NO_SCTP
506 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
507 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
508 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
509 } else
510 #endif
511 s->state = SSL3_ST_CW_CHANGE_A;
512 }
513
514 s->init_num = 0;
515 break;
516
517 case SSL3_ST_CW_CERT_VRFY_A:
518 case SSL3_ST_CW_CERT_VRFY_B:
519 dtls1_start_timer(s);
520 ret = dtls1_send_client_verify(s);
521 if (ret <= 0)
522 goto end;
523 #ifndef OPENSSL_NO_SCTP
524 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
525 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
526 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
527 } else
528 #endif
529 s->state = SSL3_ST_CW_CHANGE_A;
530 s->init_num = 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,
539 SSL3_ST_CW_CHANGE_B);
540 if (ret <= 0)
541 goto end;
542
543 s->state = SSL3_ST_CW_FINISHED_A;
544 s->init_num = 0;
545
546 s->session->cipher = s->s3->tmp.new_cipher;
547 #ifdef OPENSSL_NO_COMP
548 s->session->compress_meth = 0;
549 #else
550 if (s->s3->tmp.new_compression == NULL)
551 s->session->compress_meth = 0;
552 else
553 s->session->compress_meth = s->s3->tmp.new_compression->id;
554 #endif
555 if (!s->method->ssl3_enc->setup_key_block(s)) {
556 ret = -1;
557 s->state = SSL_ST_ERR;
558 goto end;
559 }
560
561 if (!s->method->ssl3_enc->change_cipher_state(s,
562 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
563 {
564 ret = -1;
565 s->state = SSL_ST_ERR;
566 goto end;
567 }
568 #ifndef OPENSSL_NO_SCTP
569 if (s->hit) {
570 /*
571 * Change to new shared key of SCTP-Auth, will be ignored if
572 * no SCTP used.
573 */
574 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
575 0, NULL);
576 }
577 #endif
578
579 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
580 break;
581
582 case SSL3_ST_CW_FINISHED_A:
583 case SSL3_ST_CW_FINISHED_B:
584 if (!s->hit)
585 dtls1_start_timer(s);
586 ret = dtls1_send_finished(s,
587 SSL3_ST_CW_FINISHED_A,
588 SSL3_ST_CW_FINISHED_B,
589 s->method->
590 ssl3_enc->client_finished_label,
591 s->method->
592 ssl3_enc->client_finished_label_len);
593 if (ret <= 0)
594 goto end;
595 s->state = SSL3_ST_CW_FLUSH;
596
597 /* clear flags */
598 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
599 if (s->hit) {
600 s->s3->tmp.next_state = SSL_ST_OK;
601 #ifndef OPENSSL_NO_SCTP
602 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
603 s->d1->next_state = s->s3->tmp.next_state;
604 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
605 }
606 #endif
607 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
608 s->state = SSL_ST_OK;
609 #ifndef OPENSSL_NO_SCTP
610 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
611 s->d1->next_state = SSL_ST_OK;
612 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
613 }
614 #endif
615 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
616 s->s3->delay_buf_pop_ret = 0;
617 }
618 } else {
619 #ifndef OPENSSL_NO_SCTP
620 /*
621 * Change to new shared key of SCTP-Auth, will be ignored if
622 * no SCTP used.
623 */
624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
625 0, NULL);
626 #endif
627
628 #ifndef OPENSSL_NO_TLSEXT
629 /*
630 * Allow NewSessionTicket if ticket expected
631 */
632 if (s->tlsext_ticket_expected)
633 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
634 else
635 #endif
636
637 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
638 }
639 s->init_num = 0;
640 break;
641
642 #ifndef OPENSSL_NO_TLSEXT
643 case SSL3_ST_CR_SESSION_TICKET_A:
644 case SSL3_ST_CR_SESSION_TICKET_B:
645 ret = ssl3_get_new_session_ticket(s);
646 if (ret <= 0)
647 goto end;
648 s->state = SSL3_ST_CR_FINISHED_A;
649 s->init_num = 0;
650 break;
651
652 case SSL3_ST_CR_CERT_STATUS_A:
653 case SSL3_ST_CR_CERT_STATUS_B:
654 ret = ssl3_get_cert_status(s);
655 if (ret <= 0)
656 goto end;
657 s->state = SSL3_ST_CR_KEY_EXCH_A;
658 s->init_num = 0;
659 break;
660 #endif
661
662 case SSL3_ST_CR_FINISHED_A:
663 case SSL3_ST_CR_FINISHED_B:
664 s->d1->change_cipher_spec_ok = 1;
665 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
666 SSL3_ST_CR_FINISHED_B);
667 if (ret <= 0)
668 goto end;
669 dtls1_stop_timer(s);
670
671 if (s->hit)
672 s->state = SSL3_ST_CW_CHANGE_A;
673 else
674 s->state = SSL_ST_OK;
675
676 #ifndef OPENSSL_NO_SCTP
677 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
678 state == SSL_ST_RENEGOTIATE) {
679 s->d1->next_state = s->state;
680 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
681 }
682 #endif
683
684 s->init_num = 0;
685 break;
686
687 case SSL3_ST_CW_FLUSH:
688 s->rwstate = SSL_WRITING;
689 if (BIO_flush(s->wbio) <= 0) {
690 /*
691 * If the write error was fatal, stop trying
692 */
693 if (!BIO_should_retry(s->wbio)) {
694 s->rwstate = SSL_NOTHING;
695 s->state = s->s3->tmp.next_state;
696 }
697
698 ret = -1;
699 goto end;
700 }
701 s->rwstate = SSL_NOTHING;
702 s->state = s->s3->tmp.next_state;
703 break;
704
705 case SSL_ST_OK:
706 /* clean a few things up */
707 ssl3_cleanup_key_block(s);
708
709 #if 0
710 if (s->init_buf != NULL) {
711 BUF_MEM_free(s->init_buf);
712 s->init_buf = NULL;
713 }
714 #endif
715
716 /*
717 * If we are not 'joining' the last two packets, remove the
718 * buffering now
719 */
720 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
721 ssl_free_wbio_buffer(s);
722 /* else do it later in ssl3_write */
723
724 s->init_num = 0;
725 s->renegotiate = 0;
726 s->new_session = 0;
727
728 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
729 if (s->hit)
730 s->ctx->stats.sess_hit++;
731
732 ret = 1;
733 /* s->server=0; */
734 s->handshake_func = dtls1_connect;
735 s->ctx->stats.sess_connect_good++;
736
737 if (cb != NULL)
738 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
739
740 /* done with handshaking */
741 s->d1->handshake_read_seq = 0;
742 s->d1->next_handshake_write_seq = 0;
743 goto end;
744 /* break; */
745
746 case SSL_ST_ERR:
747 default:
748 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
749 ret = -1;
750 goto end;
751 /* break; */
752 }
753
754 /* did we do anything */
755 if (!s->s3->tmp.reuse_message && !skip) {
756 if (s->debug) {
757 if ((ret = BIO_flush(s->wbio)) <= 0)
758 goto end;
759 }
760
761 if ((cb != NULL) && (s->state != state)) {
762 new_state = s->state;
763 s->state = state;
764 cb(s, SSL_CB_CONNECT_LOOP, 1);
765 s->state = new_state;
766 }
767 }
768 skip = 0;
769 }
770 end:
771 s->in_handshake--;
772
773 #ifndef OPENSSL_NO_SCTP
774 /*
775 * Notify SCTP BIO socket to leave handshake mode and allow stream
776 * identifier other than 0. Will be ignored if no SCTP is used.
777 */
778 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
779 s->in_handshake, NULL);
780 #endif
781
782 if (buf != NULL)
783 BUF_MEM_free(buf);
784 if (cb != NULL)
785 cb(s, SSL_CB_CONNECT_EXIT, ret);
786 return (ret);
787 }
788
789 int dtls1_client_hello(SSL *s)
790 {
791 unsigned char *buf;
792 unsigned char *p, *d;
793 unsigned int i, j;
794 unsigned long l;
795 SSL_COMP *comp;
796
797 buf = (unsigned char *)s->init_buf->data;
798 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
799 SSL_SESSION *sess = s->session;
800 if ((s->session == NULL) || (s->session->ssl_version != s->version) ||
801 #ifdef OPENSSL_NO_TLSEXT
802 !sess->session_id_length ||
803 #else
804 (!sess->session_id_length && !sess->tlsext_tick) ||
805 #endif
806 (s->session->not_resumable)) {
807 if (!ssl_get_new_session(s, 0))
808 goto err;
809 }
810 /* else use the pre-loaded session */
811
812 p = s->s3->client_random;
813
814 /*
815 * if client_random is initialized, reuse it, we are required to use
816 * same upon reply to HelloVerify
817 */
818 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ;
819 if (i == sizeof(s->s3->client_random))
820 ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random));
821
822 /* Do the message type and length last */
823 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
824
825 *(p++) = s->version >> 8;
826 *(p++) = s->version & 0xff;
827 s->client_version = s->version;
828
829 /* Random stuff */
830 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
831 p += SSL3_RANDOM_SIZE;
832
833 /* Session ID */
834 if (s->new_session)
835 i = 0;
836 else
837 i = s->session->session_id_length;
838 *(p++) = i;
839 if (i != 0) {
840 if (i > sizeof s->session->session_id) {
841 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
842 goto err;
843 }
844 memcpy(p, s->session->session_id, i);
845 p += i;
846 }
847
848 /* cookie stuff */
849 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
850 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
851 goto err;
852 }
853 *(p++) = s->d1->cookie_len;
854 memcpy(p, s->d1->cookie, s->d1->cookie_len);
855 p += s->d1->cookie_len;
856
857 /* Ciphers supported */
858 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
859 if (i == 0) {
860 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
861 goto err;
862 }
863 s2n(i, p);
864 p += i;
865
866 /* COMPRESSION */
867 if (s->ctx->comp_methods == NULL)
868 j = 0;
869 else
870 j = sk_SSL_COMP_num(s->ctx->comp_methods);
871 *(p++) = 1 + j;
872 for (i = 0; i < j; i++) {
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 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
882 goto err;
883 }
884 if ((p =
885 ssl_add_clienthello_tlsext(s, p,
886 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
887 NULL) {
888 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
889 goto err;
890 }
891 #endif
892
893 l = (p - d);
894 d = buf;
895
896 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
897
898 s->state = SSL3_ST_CW_CLNT_HELLO_B;
899 /* number of bytes to write */
900 s->init_num = p - buf;
901 s->init_off = 0;
902
903 /* buffer the message to handle re-xmits */
904 dtls1_buffer_message(s, 0);
905 }
906
907 /* SSL3_ST_CW_CLNT_HELLO_B */
908 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
909 err:
910 return (-1);
911 }
912
913 static int dtls1_get_hello_verify(SSL *s)
914 {
915 int n, al, ok = 0;
916 unsigned char *data;
917 unsigned int cookie_len;
918
919 n = s->method->ssl_get_message(s,
920 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
921 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
922 -1, s->max_cert_list, &ok);
923
924 if (!ok)
925 return ((int)n);
926
927 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
928 s->d1->send_cookie = 0;
929 s->s3->tmp.reuse_message = 1;
930 return (1);
931 }
932
933 data = (unsigned char *)s->init_msg;
934
935 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) {
936 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
937 s->version = (s->version & 0xff00) | data[1];
938 al = SSL_AD_PROTOCOL_VERSION;
939 goto f_err;
940 }
941 data += 2;
942
943 cookie_len = *(data++);
944 if (cookie_len > sizeof(s->d1->cookie)) {
945 al = SSL_AD_ILLEGAL_PARAMETER;
946 goto f_err;
947 }
948
949 memcpy(s->d1->cookie, data, cookie_len);
950 s->d1->cookie_len = cookie_len;
951
952 s->d1->send_cookie = 1;
953 return 1;
954
955 f_err:
956 ssl3_send_alert(s, SSL3_AL_FATAL, al);
957 s->state = SSL_ST_ERR;
958 return -1;
959 }
960
961 int dtls1_send_client_key_exchange(SSL *s)
962 {
963 unsigned char *p, *d;
964 int n;
965 unsigned long alg_k;
966 #ifndef OPENSSL_NO_RSA
967 unsigned char *q;
968 EVP_PKEY *pkey = NULL;
969 #endif
970 #ifndef OPENSSL_NO_KRB5
971 KSSL_ERR kssl_err;
972 #endif /* OPENSSL_NO_KRB5 */
973 #ifndef OPENSSL_NO_ECDH
974 EC_KEY *clnt_ecdh = NULL;
975 const EC_POINT *srvr_ecpoint = NULL;
976 EVP_PKEY *srvr_pub_pkey = NULL;
977 unsigned char *encodedPoint = NULL;
978 int encoded_pt_len = 0;
979 BN_CTX *bn_ctx = NULL;
980 #endif
981
982 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
983 d = (unsigned char *)s->init_buf->data;
984 p = &(d[DTLS1_HM_HEADER_LENGTH]);
985
986 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
987
988 /* Fool emacs indentation */
989 if (0) {
990 }
991 #ifndef OPENSSL_NO_RSA
992 else if (alg_k & SSL_kRSA) {
993 RSA *rsa;
994 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
995
996 if (s->session->sess_cert == NULL) {
997 /*
998 * We should always have a server certificate with SSL_kRSA.
999 */
1000 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1001 ERR_R_INTERNAL_ERROR);
1002 goto err;
1003 }
1004
1005 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1006 rsa = s->session->sess_cert->peer_rsa_tmp;
1007 else {
1008 pkey =
1009 X509_get_pubkey(s->session->
1010 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
1011 x509);
1012 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
1013 || (pkey->pkey.rsa == NULL)) {
1014 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1015 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)
1037 p[1]++;
1038 if (s->options & SSL_OP_PKCS1_CHECK_2)
1039 tmp_buf[0] = 0x70;
1040 # endif
1041 if (n <= 0) {
1042 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1043 SSL_R_BAD_RSA_ENCRYPT);
1044 goto err;
1045 }
1046
1047 /* Fix buf for TLS and [incidentally] DTLS */
1048 if (s->version > SSL3_VERSION) {
1049 s2n(n, q);
1050 n += 2;
1051 }
1052
1053 s->session->master_key_length =
1054 s->method->ssl3_enc->generate_master_secret(s,
1055 s->
1056 session->master_key,
1057 tmp_buf,
1058 sizeof tmp_buf);
1059 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1060 }
1061 #endif
1062 #ifndef OPENSSL_NO_KRB5
1063 else if (alg_k & SSL_kKRB5) {
1064 krb5_error_code krb5rc;
1065 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1066 /* krb5_data krb5_ap_req; */
1067 krb5_data *enc_ticket;
1068 krb5_data authenticator, *authp = NULL;
1069 EVP_CIPHER_CTX ciph_ctx;
1070 const EVP_CIPHER *enc = NULL;
1071 unsigned char iv[EVP_MAX_IV_LENGTH];
1072 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1073 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
1074 int padl, outl = sizeof(epms);
1075
1076 EVP_CIPHER_CTX_init(&ciph_ctx);
1077
1078 # ifdef KSSL_DEBUG
1079 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1080 alg_k, SSL_kKRB5);
1081 # endif /* KSSL_DEBUG */
1082
1083 authp = NULL;
1084 # ifdef KRB5SENDAUTH
1085 if (KRB5SENDAUTH)
1086 authp = &authenticator;
1087 # endif /* KRB5SENDAUTH */
1088
1089 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
1090 enc = kssl_map_enc(kssl_ctx->enctype);
1091 if (enc == NULL)
1092 goto err;
1093 # ifdef KSSL_DEBUG
1094 {
1095 printf("kssl_cget_tkt rtn %d\n", krb5rc);
1096 if (krb5rc && kssl_err.text)
1097 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1098 }
1099 # endif /* KSSL_DEBUG */
1100
1101 if (krb5rc) {
1102 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1103 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
1104 goto err;
1105 }
1106
1107 /*-
1108 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
1109 ** in place of RFC 2712 KerberosWrapper, as in:
1110 **
1111 ** Send ticket (copy to *p, set n = length)
1112 ** n = krb5_ap_req.length;
1113 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1114 ** if (krb5_ap_req.data)
1115 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1116 **
1117 ** Now using real RFC 2712 KerberosWrapper
1118 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1119 ** Note: 2712 "opaque" types are here replaced
1120 ** with a 2-byte length followed by the value.
1121 ** Example:
1122 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1123 ** Where "xx xx" = length bytes. Shown here with
1124 ** optional authenticator omitted.
1125 */
1126
1127 /* KerberosWrapper.Ticket */
1128 s2n(enc_ticket->length, p);
1129 memcpy(p, enc_ticket->data, enc_ticket->length);
1130 p += enc_ticket->length;
1131 n = enc_ticket->length + 2;
1132
1133 /* KerberosWrapper.Authenticator */
1134 if (authp && authp->length) {
1135 s2n(authp->length, p);
1136 memcpy(p, authp->data, authp->length);
1137 p += authp->length;
1138 n += authp->length + 2;
1139
1140 free(authp->data);
1141 authp->data = NULL;
1142 authp->length = 0;
1143 } else {
1144 s2n(0, p); /* null authenticator length */
1145 n += 2;
1146 }
1147
1148 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0)
1149 goto err;
1150
1151 /*-
1152 * 20010420 VRS. Tried it this way; failed.
1153 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1154 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1155 * kssl_ctx->length);
1156 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1157 */
1158
1159 memset(iv, 0, sizeof iv); /* per RFC 1510 */
1160 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
1161 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
1162 sizeof tmp_buf);
1163 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
1164 outl += padl;
1165 if (outl > (int)sizeof epms) {
1166 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1167 ERR_R_INTERNAL_ERROR);
1168 goto err;
1169 }
1170 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1171
1172 /* KerberosWrapper.EncryptedPreMasterSecret */
1173 s2n(outl, p);
1174 memcpy(p, epms, outl);
1175 p += outl;
1176 n += outl + 2;
1177
1178 s->session->master_key_length =
1179 s->method->ssl3_enc->generate_master_secret(s,
1180 s->
1181 session->master_key,
1182 tmp_buf,
1183 sizeof tmp_buf);
1184
1185 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1186 OPENSSL_cleanse(epms, outl);
1187 }
1188 #endif
1189 #ifndef OPENSSL_NO_DH
1190 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
1191 DH *dh_srvr, *dh_clnt;
1192
1193 if (s->session->sess_cert == NULL) {
1194 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1195 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1196 SSL_R_UNEXPECTED_MESSAGE);
1197 goto err;
1198 }
1199
1200 if (s->session->sess_cert->peer_dh_tmp != NULL)
1201 dh_srvr = s->session->sess_cert->peer_dh_tmp;
1202 else {
1203 /* we get them from the cert */
1204 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1205 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1206 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1207 goto err;
1208 }
1209
1210 /* generate a new random key */
1211 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
1212 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1213 goto err;
1214 }
1215 if (!DH_generate_key(dh_clnt)) {
1216 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1217 goto err;
1218 }
1219
1220 /*
1221 * use the 'p' output buffer for the DH key, but make sure to
1222 * clear it out afterwards
1223 */
1224
1225 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
1226
1227 if (n <= 0) {
1228 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1229 goto err;
1230 }
1231
1232 /* generate master key from the result */
1233 s->session->master_key_length =
1234 s->method->ssl3_enc->generate_master_secret(s,
1235 s->
1236 session->master_key,
1237 p, n);
1238 /* clean up */
1239 memset(p, 0, n);
1240
1241 /* send off the data */
1242 n = BN_num_bytes(dh_clnt->pub_key);
1243 s2n(n, p);
1244 BN_bn2bin(dh_clnt->pub_key, p);
1245 n += 2;
1246
1247 DH_free(dh_clnt);
1248
1249 /* perhaps clean things up a bit EAY EAY EAY EAY */
1250 }
1251 #endif
1252 #ifndef OPENSSL_NO_ECDH
1253 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) {
1254 const EC_GROUP *srvr_group = NULL;
1255 EC_KEY *tkey;
1256 int ecdh_clnt_cert = 0;
1257 int field_size = 0;
1258
1259 if (s->session->sess_cert == NULL) {
1260 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1261 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1262 SSL_R_UNEXPECTED_MESSAGE);
1263 goto err;
1264 }
1265
1266 /*
1267 * Did we send out the client's ECDH share for use in premaster
1268 * computation as part of client certificate? If so, set
1269 * ecdh_clnt_cert to 1.
1270 */
1271 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
1272 /*
1273 * XXX: For now, we do not support client authentication
1274 * using ECDH certificates. To add such support, one needs to
1275 * add code that checks for appropriate conditions and sets
1276 * ecdh_clnt_cert to 1. For example, the cert have an ECC key
1277 * on the same curve as the server's and the key should be
1278 * authorized for key agreement. One also needs to add code
1279 * in ssl3_connect to skip sending the certificate verify
1280 * message. if ((s->cert->key->privatekey != NULL) &&
1281 * (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...)
1282 * ecdh_clnt_cert = 1;
1283 */
1284 }
1285
1286 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
1287 tkey = s->session->sess_cert->peer_ecdh_tmp;
1288 } else {
1289 /* Get the Server Public Key from Cert */
1290 srvr_pub_pkey =
1291 X509_get_pubkey(s->session->
1292 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1293 if ((srvr_pub_pkey == NULL)
1294 || (srvr_pub_pkey->type != EVP_PKEY_EC)
1295 || (srvr_pub_pkey->pkey.ec == NULL)) {
1296 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1297 ERR_R_INTERNAL_ERROR);
1298 goto err;
1299 }
1300
1301 tkey = srvr_pub_pkey->pkey.ec;
1302 }
1303
1304 srvr_group = EC_KEY_get0_group(tkey);
1305 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1306
1307 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
1308 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1309 ERR_R_INTERNAL_ERROR);
1310 goto err;
1311 }
1312
1313 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
1314 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1315 ERR_R_MALLOC_FAILURE);
1316 goto err;
1317 }
1318
1319 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
1320 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
1321 goto err;
1322 }
1323 if (ecdh_clnt_cert) {
1324 /*
1325 * Reuse key info from our certificate We only need our
1326 * private key to perform the ECDH computation.
1327 */
1328 const BIGNUM *priv_key;
1329 tkey = s->cert->key->privatekey->pkey.ec;
1330 priv_key = EC_KEY_get0_private_key(tkey);
1331 if (priv_key == NULL) {
1332 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1333 ERR_R_MALLOC_FAILURE);
1334 goto err;
1335 }
1336 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
1337 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1338 ERR_R_EC_LIB);
1339 goto err;
1340 }
1341 } else {
1342 /* Generate a new ECDH key pair */
1343 if (!(EC_KEY_generate_key(clnt_ecdh))) {
1344 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1345 ERR_R_ECDH_LIB);
1346 goto err;
1347 }
1348 }
1349
1350 /*
1351 * use the 'p' output buffer for the ECDH key, but make sure to
1352 * clear it out afterwards
1353 */
1354
1355 field_size = EC_GROUP_get_degree(srvr_group);
1356 if (field_size <= 0) {
1357 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1358 goto err;
1359 }
1360 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint,
1361 clnt_ecdh, NULL);
1362 if (n <= 0) {
1363 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1364 goto err;
1365 }
1366
1367 /* generate master key from the result */
1368 s->session->master_key_length =
1369 s->method->ssl3_enc->generate_master_secret(s,
1370 s->
1371 session->master_key,
1372 p, n);
1373
1374 memset(p, 0, n); /* clean up */
1375
1376 if (ecdh_clnt_cert) {
1377 /* Send empty client key exch message */
1378 n = 0;
1379 } else {
1380 /*
1381 * First check the size of encoding and allocate memory
1382 * accordingly.
1383 */
1384 encoded_pt_len =
1385 EC_POINT_point2oct(srvr_group,
1386 EC_KEY_get0_public_key(clnt_ecdh),
1387 POINT_CONVERSION_UNCOMPRESSED,
1388 NULL, 0, NULL);
1389
1390 encodedPoint = (unsigned char *)
1391 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
1392 bn_ctx = BN_CTX_new();
1393 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1394 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1395 ERR_R_MALLOC_FAILURE);
1396 goto err;
1397 }
1398
1399 /* Encode the public key */
1400 n = EC_POINT_point2oct(srvr_group,
1401 EC_KEY_get0_public_key(clnt_ecdh),
1402 POINT_CONVERSION_UNCOMPRESSED,
1403 encodedPoint, encoded_pt_len, bn_ctx);
1404
1405 *p = n; /* length of encoded point */
1406 /* Encoded point will be copied here */
1407 p += 1;
1408 /* copy the point */
1409 memcpy((unsigned char *)p, encodedPoint, n);
1410 /* increment n to account for length field */
1411 n += 1;
1412 }
1413
1414 /* Free allocated memory */
1415 BN_CTX_free(bn_ctx);
1416 if (encodedPoint != NULL)
1417 OPENSSL_free(encodedPoint);
1418 if (clnt_ecdh != NULL)
1419 EC_KEY_free(clnt_ecdh);
1420 EVP_PKEY_free(srvr_pub_pkey);
1421 }
1422 #endif /* !OPENSSL_NO_ECDH */
1423
1424 #ifndef OPENSSL_NO_PSK
1425 else if (alg_k & SSL_kPSK) {
1426 char identity[PSK_MAX_IDENTITY_LEN];
1427 unsigned char *t = NULL;
1428 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4];
1429 unsigned int pre_ms_len = 0, psk_len = 0;
1430 int psk_err = 1;
1431
1432 n = 0;
1433 if (s->psk_client_callback == NULL) {
1434 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1435 SSL_R_PSK_NO_CLIENT_CB);
1436 goto err;
1437 }
1438
1439 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1440 identity, PSK_MAX_IDENTITY_LEN,
1441 psk_or_pre_ms,
1442 sizeof(psk_or_pre_ms));
1443 if (psk_len > PSK_MAX_PSK_LEN) {
1444 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1445 ERR_R_INTERNAL_ERROR);
1446 goto psk_err;
1447 } else if (psk_len == 0) {
1448 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1449 SSL_R_PSK_IDENTITY_NOT_FOUND);
1450 goto psk_err;
1451 }
1452
1453 /* create PSK pre_master_secret */
1454 pre_ms_len = 2 + psk_len + 2 + psk_len;
1455 t = psk_or_pre_ms;
1456 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len);
1457 s2n(psk_len, t);
1458 memset(t, 0, psk_len);
1459 t += psk_len;
1460 s2n(psk_len, t);
1461
1462 if (s->session->psk_identity_hint != NULL)
1463 OPENSSL_free(s->session->psk_identity_hint);
1464 s->session->psk_identity_hint =
1465 BUF_strdup(s->ctx->psk_identity_hint);
1466 if (s->ctx->psk_identity_hint != NULL
1467 && s->session->psk_identity_hint == NULL) {
1468 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1469 ERR_R_MALLOC_FAILURE);
1470 goto psk_err;
1471 }
1472
1473 if (s->session->psk_identity != NULL)
1474 OPENSSL_free(s->session->psk_identity);
1475 s->session->psk_identity = BUF_strdup(identity);
1476 if (s->session->psk_identity == NULL) {
1477 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1478 ERR_R_MALLOC_FAILURE);
1479 goto psk_err;
1480 }
1481
1482 s->session->master_key_length =
1483 s->method->ssl3_enc->generate_master_secret(s,
1484 s->
1485 session->master_key,
1486 psk_or_pre_ms,
1487 pre_ms_len);
1488 n = strlen(identity);
1489 s2n(n, p);
1490 memcpy(p, identity, n);
1491 n += 2;
1492 psk_err = 0;
1493 psk_err:
1494 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1495 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1496 if (psk_err != 0) {
1497 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1498 goto err;
1499 }
1500 }
1501 #endif
1502 else {
1503 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1504 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1505 ERR_R_INTERNAL_ERROR);
1506 goto err;
1507 }
1508
1509 d = dtls1_set_message_header(s, d,
1510 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1511 /*-
1512 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1513 l2n3(n,d);
1514 l2n(s->d1->handshake_write_seq,d);
1515 s->d1->handshake_write_seq++;
1516 */
1517
1518 s->state = SSL3_ST_CW_KEY_EXCH_B;
1519 /* number of bytes to write */
1520 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1521 s->init_off = 0;
1522
1523 /* buffer the message to handle re-xmits */
1524 dtls1_buffer_message(s, 0);
1525 }
1526
1527 /* SSL3_ST_CW_KEY_EXCH_B */
1528 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1529 err:
1530 #ifndef OPENSSL_NO_ECDH
1531 BN_CTX_free(bn_ctx);
1532 if (encodedPoint != NULL)
1533 OPENSSL_free(encodedPoint);
1534 if (clnt_ecdh != NULL)
1535 EC_KEY_free(clnt_ecdh);
1536 EVP_PKEY_free(srvr_pub_pkey);
1537 #endif
1538 return (-1);
1539 }
1540
1541 int dtls1_send_client_verify(SSL *s)
1542 {
1543 unsigned char *p, *d;
1544 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1545 EVP_PKEY *pkey;
1546 #ifndef OPENSSL_NO_RSA
1547 unsigned u = 0;
1548 #endif
1549 unsigned long n;
1550 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1551 int j;
1552 #endif
1553
1554 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
1555 d = (unsigned char *)s->init_buf->data;
1556 p = &(d[DTLS1_HM_HEADER_LENGTH]);
1557 pkey = s->cert->key->privatekey;
1558
1559 s->method->ssl3_enc->cert_verify_mac(s,
1560 NID_sha1,
1561 &(data[MD5_DIGEST_LENGTH]));
1562
1563 #ifndef OPENSSL_NO_RSA
1564 if (pkey->type == EVP_PKEY_RSA) {
1565 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
1566 if (RSA_sign(NID_md5_sha1, data,
1567 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
1568 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1569 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
1570 goto err;
1571 }
1572 s2n(u, p);
1573 n = u + 2;
1574 } else
1575 #endif
1576 #ifndef OPENSSL_NO_DSA
1577 if (pkey->type == EVP_PKEY_DSA) {
1578 if (!DSA_sign(pkey->save_type,
1579 &(data[MD5_DIGEST_LENGTH]),
1580 SHA_DIGEST_LENGTH, &(p[2]),
1581 (unsigned int *)&j, pkey->pkey.dsa)) {
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 } else
1588 #endif
1589 #ifndef OPENSSL_NO_ECDSA
1590 if (pkey->type == EVP_PKEY_EC) {
1591 if (!ECDSA_sign(pkey->save_type,
1592 &(data[MD5_DIGEST_LENGTH]),
1593 SHA_DIGEST_LENGTH, &(p[2]),
1594 (unsigned int *)&j, pkey->pkey.ec)) {
1595 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
1596 goto err;
1597 }
1598 s2n(j, p);
1599 n = j + 2;
1600 } else
1601 #endif
1602 {
1603 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
1604 goto err;
1605 }
1606
1607 d = dtls1_set_message_header(s, d,
1608 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n);
1609
1610 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH;
1611 s->init_off = 0;
1612
1613 /* buffer the message to handle re-xmits */
1614 dtls1_buffer_message(s, 0);
1615
1616 s->state = SSL3_ST_CW_CERT_VRFY_B;
1617 }
1618
1619 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1620 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1621 err:
1622 return (-1);
1623 }
1624
1625 int dtls1_send_client_certificate(SSL *s)
1626 {
1627 X509 *x509 = NULL;
1628 EVP_PKEY *pkey = NULL;
1629 int i;
1630 unsigned long l;
1631
1632 if (s->state == SSL3_ST_CW_CERT_A) {
1633 if ((s->cert == NULL) ||
1634 (s->cert->key->x509 == NULL) ||
1635 (s->cert->key->privatekey == NULL))
1636 s->state = SSL3_ST_CW_CERT_B;
1637 else
1638 s->state = SSL3_ST_CW_CERT_C;
1639 }
1640
1641 /* We need to get a client cert */
1642 if (s->state == SSL3_ST_CW_CERT_B) {
1643 /*
1644 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
1645 * return(-1); We then get retied later
1646 */
1647 i = 0;
1648 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1649 if (i < 0) {
1650 s->rwstate = SSL_X509_LOOKUP;
1651 return (-1);
1652 }
1653 s->rwstate = SSL_NOTHING;
1654 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
1655 s->state = SSL3_ST_CW_CERT_B;
1656 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
1657 i = 0;
1658 } else if (i == 1) {
1659 i = 0;
1660 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,
1661 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1662 }
1663
1664 if (x509 != NULL)
1665 X509_free(x509);
1666 if (pkey != NULL)
1667 EVP_PKEY_free(pkey);
1668 if (i == 0) {
1669 if (s->version == SSL3_VERSION) {
1670 s->s3->tmp.cert_req = 0;
1671 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
1672 return (1);
1673 } else {
1674 s->s3->tmp.cert_req = 2;
1675 }
1676 }
1677
1678 /* Ok, we have a cert */
1679 s->state = SSL3_ST_CW_CERT_C;
1680 }
1681
1682 if (s->state == SSL3_ST_CW_CERT_C) {
1683 s->state = SSL3_ST_CW_CERT_D;
1684 l = dtls1_output_cert_chain(s,
1685 (s->s3->tmp.cert_req ==
1686 2) ? NULL : s->cert->key->x509);
1687 if (!l) {
1688 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1689 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
1690 return 0;
1691 }
1692 s->init_num = (int)l;
1693 s->init_off = 0;
1694
1695 /* set header called by dtls1_output_cert_chain() */
1696
1697 /* buffer the message to handle re-xmits */
1698 dtls1_buffer_message(s, 0);
1699 }
1700 /* SSL3_ST_CW_CERT_D */
1701 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1702 }
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