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[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 "ssl_locl.h"
118 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
120 #include <openssl/objects.h>
121 #include <openssl/evp.h>
122 #include <openssl/md5.h>
123 #include <openssl/bn.h>
124 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
126 #endif
127
128 static const SSL_METHOD *dtls1_get_client_method(int ver);
129 static int dtls1_get_hello_verify(SSL *s);
130
131 static const SSL_METHOD *dtls1_get_client_method(int ver)
132 {
133 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
134 return(DTLSv1_client_method());
135 else
136 return(NULL);
137 }
138
139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
140 ssl_undefined_function,
141 dtls1_connect,
142 dtls1_get_client_method)
143
144 int dtls1_connect(SSL *s)
145 {
146 BUF_MEM *buf=NULL;
147 unsigned long Time=(unsigned long)time(NULL);
148 long num1;
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
150 int ret= -1;
151 int new_state,state,skip=0;;
152
153 RAND_add(&Time,sizeof(Time),0);
154 ERR_clear_error();
155 clear_sys_error();
156
157 if (s->info_callback != NULL)
158 cb=s->info_callback;
159 else if (s->ctx->info_callback != NULL)
160 cb=s->ctx->info_callback;
161
162 s->in_handshake++;
163 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
164
165 for (;;)
166 {
167 state=s->state;
168
169 switch(s->state)
170 {
171 case SSL_ST_RENEGOTIATE:
172 s->new_session=1;
173 s->state=SSL_ST_CONNECT;
174 s->ctx->stats.sess_connect_renegotiate++;
175 /* break */
176 case SSL_ST_BEFORE:
177 case SSL_ST_CONNECT:
178 case SSL_ST_BEFORE|SSL_ST_CONNECT:
179 case SSL_ST_OK|SSL_ST_CONNECT:
180
181 s->server=0;
182 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
183
184 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
185 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
186 {
187 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
188 ret = -1;
189 goto end;
190 }
191
192 /* s->version=SSL3_VERSION; */
193 s->type=SSL_ST_CONNECT;
194
195 if (s->init_buf == NULL)
196 {
197 if ((buf=BUF_MEM_new()) == NULL)
198 {
199 ret= -1;
200 goto end;
201 }
202 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
203 {
204 ret= -1;
205 goto end;
206 }
207 s->init_buf=buf;
208 buf=NULL;
209 }
210
211 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
212
213 /* setup buffing BIO */
214 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
215
216 /* don't push the buffering BIO quite yet */
217
218 s->state=SSL3_ST_CW_CLNT_HELLO_A;
219 s->ctx->stats.sess_connect++;
220 s->init_num=0;
221 /* mark client_random uninitialized */
222 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
223 break;
224
225 case SSL3_ST_CW_CLNT_HELLO_A:
226 case SSL3_ST_CW_CLNT_HELLO_B:
227
228 s->shutdown=0;
229
230 /* every DTLS ClientHello resets Finished MAC */
231 ssl3_init_finished_mac(s);
232
233 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
234 ret=dtls1_client_hello(s);
235 if (ret <= 0) goto end;
236
237 if ( s->d1->send_cookie)
238 {
239 s->state=SSL3_ST_CW_FLUSH;
240 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
241 }
242 else
243 s->state=SSL3_ST_CR_SRVR_HELLO_A;
244
245 s->init_num=0;
246
247 /* turn on buffering for the next lot of output */
248 if (s->bbio != s->wbio)
249 s->wbio=BIO_push(s->bbio,s->wbio);
250
251 break;
252
253 case SSL3_ST_CR_SRVR_HELLO_A:
254 case SSL3_ST_CR_SRVR_HELLO_B:
255 ret=ssl3_get_server_hello(s);
256 if (ret <= 0) goto end;
257 else
258 {
259 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
260 if (s->hit)
261 s->state=SSL3_ST_CR_FINISHED_A;
262 else
263 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
264 }
265 s->init_num=0;
266 break;
267
268 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
269 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
270
271 ret = dtls1_get_hello_verify(s);
272 if ( ret <= 0)
273 goto end;
274 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
275 if ( s->d1->send_cookie) /* start again, with a cookie */
276 s->state=SSL3_ST_CW_CLNT_HELLO_A;
277 else
278 s->state = SSL3_ST_CR_CERT_A;
279 s->init_num = 0;
280 break;
281
282 case SSL3_ST_CR_CERT_A:
283 case SSL3_ST_CR_CERT_B:
284 /* Check if it is anon DH */
285 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
286 {
287 ret=ssl3_get_server_certificate(s);
288 if (ret <= 0) goto end;
289 }
290 else
291 skip=1;
292 s->state=SSL3_ST_CR_KEY_EXCH_A;
293 s->init_num=0;
294 break;
295
296 case SSL3_ST_CR_KEY_EXCH_A:
297 case SSL3_ST_CR_KEY_EXCH_B:
298 ret=ssl3_get_key_exchange(s);
299 if (ret <= 0) goto end;
300 s->state=SSL3_ST_CR_CERT_REQ_A;
301 s->init_num=0;
302
303 /* at this point we check that we have the
304 * required stuff from the server */
305 if (!ssl3_check_cert_and_algorithm(s))
306 {
307 ret= -1;
308 goto end;
309 }
310 break;
311
312 case SSL3_ST_CR_CERT_REQ_A:
313 case SSL3_ST_CR_CERT_REQ_B:
314 ret=ssl3_get_certificate_request(s);
315 if (ret <= 0) goto end;
316 s->state=SSL3_ST_CR_SRVR_DONE_A;
317 s->init_num=0;
318 break;
319
320 case SSL3_ST_CR_SRVR_DONE_A:
321 case SSL3_ST_CR_SRVR_DONE_B:
322 ret=ssl3_get_server_done(s);
323 if (ret <= 0) goto end;
324 if (s->s3->tmp.cert_req)
325 s->state=SSL3_ST_CW_CERT_A;
326 else
327 s->state=SSL3_ST_CW_KEY_EXCH_A;
328 s->init_num=0;
329
330 break;
331
332 case SSL3_ST_CW_CERT_A:
333 case SSL3_ST_CW_CERT_B:
334 case SSL3_ST_CW_CERT_C:
335 case SSL3_ST_CW_CERT_D:
336 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
337 ret=dtls1_send_client_certificate(s);
338 if (ret <= 0) goto end;
339 s->state=SSL3_ST_CW_KEY_EXCH_A;
340 s->init_num=0;
341 break;
342
343 case SSL3_ST_CW_KEY_EXCH_A:
344 case SSL3_ST_CW_KEY_EXCH_B:
345 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
346 ret=dtls1_send_client_key_exchange(s);
347 if (ret <= 0) goto end;
348 /* EAY EAY EAY need to check for DH fix cert
349 * sent back */
350 /* For TLS, cert_req is set to 2, so a cert chain
351 * of nothing is sent, but no verify packet is sent */
352 if (s->s3->tmp.cert_req == 1)
353 {
354 s->state=SSL3_ST_CW_CERT_VRFY_A;
355 }
356 else
357 {
358 s->state=SSL3_ST_CW_CHANGE_A;
359 s->s3->change_cipher_spec=0;
360 }
361
362 s->init_num=0;
363 break;
364
365 case SSL3_ST_CW_CERT_VRFY_A:
366 case SSL3_ST_CW_CERT_VRFY_B:
367 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
368 ret=dtls1_send_client_verify(s);
369 if (ret <= 0) goto end;
370 s->state=SSL3_ST_CW_CHANGE_A;
371 s->init_num=0;
372 s->s3->change_cipher_spec=0;
373 break;
374
375 case SSL3_ST_CW_CHANGE_A:
376 case SSL3_ST_CW_CHANGE_B:
377 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
378 ret=dtls1_send_change_cipher_spec(s,
379 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
380 if (ret <= 0) goto end;
381 s->state=SSL3_ST_CW_FINISHED_A;
382 s->init_num=0;
383
384 s->session->cipher=s->s3->tmp.new_cipher;
385 #ifdef OPENSSL_NO_COMP
386 s->session->compress_meth=0;
387 #else
388 if (s->s3->tmp.new_compression == NULL)
389 s->session->compress_meth=0;
390 else
391 s->session->compress_meth=
392 s->s3->tmp.new_compression->id;
393 #endif
394 if (!s->method->ssl3_enc->setup_key_block(s))
395 {
396 ret= -1;
397 goto end;
398 }
399
400 if (!s->method->ssl3_enc->change_cipher_state(s,
401 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
402 {
403 ret= -1;
404 goto end;
405 }
406
407 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
408 break;
409
410 case SSL3_ST_CW_FINISHED_A:
411 case SSL3_ST_CW_FINISHED_B:
412 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
413 ret=dtls1_send_finished(s,
414 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
415 s->method->ssl3_enc->client_finished_label,
416 s->method->ssl3_enc->client_finished_label_len);
417 if (ret <= 0) goto end;
418 s->state=SSL3_ST_CW_FLUSH;
419
420 /* clear flags */
421 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
422 if (s->hit)
423 {
424 s->s3->tmp.next_state=SSL_ST_OK;
425 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
426 {
427 s->state=SSL_ST_OK;
428 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
429 s->s3->delay_buf_pop_ret=0;
430 }
431 }
432 else
433 {
434 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
435 }
436 s->init_num=0;
437 break;
438
439 case SSL3_ST_CR_FINISHED_A:
440 case SSL3_ST_CR_FINISHED_B:
441
442 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
443 SSL3_ST_CR_FINISHED_B);
444 if (ret <= 0) goto end;
445 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
446
447 if (s->hit)
448 s->state=SSL3_ST_CW_CHANGE_A;
449 else
450 s->state=SSL_ST_OK;
451 s->init_num=0;
452 break;
453
454 case SSL3_ST_CW_FLUSH:
455 /* number of bytes to be flushed */
456 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
457 if (num1 > 0)
458 {
459 s->rwstate=SSL_WRITING;
460 num1=BIO_flush(s->wbio);
461 if (num1 <= 0) { ret= -1; goto end; }
462 s->rwstate=SSL_NOTHING;
463 }
464
465 s->state=s->s3->tmp.next_state;
466 break;
467
468 case SSL_ST_OK:
469 /* clean a few things up */
470 ssl3_cleanup_key_block(s);
471
472 #if 0
473 if (s->init_buf != NULL)
474 {
475 BUF_MEM_free(s->init_buf);
476 s->init_buf=NULL;
477 }
478 #endif
479
480 /* If we are not 'joining' the last two packets,
481 * remove the buffering now */
482 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
483 ssl_free_wbio_buffer(s);
484 /* else do it later in ssl3_write */
485
486 s->init_num=0;
487 s->new_session=0;
488
489 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
490 if (s->hit) s->ctx->stats.sess_hit++;
491
492 ret=1;
493 /* s->server=0; */
494 s->handshake_func=dtls1_connect;
495 s->ctx->stats.sess_connect_good++;
496
497 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
498
499 /* done with handshaking */
500 s->d1->handshake_read_seq = 0;
501 s->d1->next_handshake_write_seq = 0;
502 goto end;
503 /* break; */
504
505 default:
506 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
507 ret= -1;
508 goto end;
509 /* break; */
510 }
511
512 /* did we do anything */
513 if (!s->s3->tmp.reuse_message && !skip)
514 {
515 if (s->debug)
516 {
517 if ((ret=BIO_flush(s->wbio)) <= 0)
518 goto end;
519 }
520
521 if ((cb != NULL) && (s->state != state))
522 {
523 new_state=s->state;
524 s->state=state;
525 cb(s,SSL_CB_CONNECT_LOOP,1);
526 s->state=new_state;
527 }
528 }
529 skip=0;
530 }
531 end:
532 s->in_handshake--;
533 if (buf != NULL)
534 BUF_MEM_free(buf);
535 if (cb != NULL)
536 cb(s,SSL_CB_CONNECT_EXIT,ret);
537 return(ret);
538 }
539
540 int dtls1_client_hello(SSL *s)
541 {
542 unsigned char *buf;
543 unsigned char *p,*d;
544 unsigned int i,j;
545 unsigned long Time,l;
546 SSL_COMP *comp;
547
548 buf=(unsigned char *)s->init_buf->data;
549 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
550 {
551 if ((s->session == NULL) ||
552 (s->session->ssl_version != s->version) ||
553 (s->session->not_resumable))
554 {
555 if (!ssl_get_new_session(s,0))
556 goto err;
557 }
558 /* else use the pre-loaded session */
559
560 p=s->s3->client_random;
561
562 /* if client_random is initialized, reuse it, we are
563 * required to use same upon reply to HelloVerify */
564 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
565 if (i==sizeof(s->s3->client_random))
566 {
567 Time=(unsigned long)time(NULL); /* Time */
568 l2n(Time,p);
569 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
570 }
571
572 /* Do the message type and length last */
573 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
574
575 *(p++)=s->version>>8;
576 *(p++)=s->version&0xff;
577 s->client_version=s->version;
578
579 /* Random stuff */
580 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
581 p+=SSL3_RANDOM_SIZE;
582
583 /* Session ID */
584 if (s->new_session)
585 i=0;
586 else
587 i=s->session->session_id_length;
588 *(p++)=i;
589 if (i != 0)
590 {
591 if (i > sizeof s->session->session_id)
592 {
593 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
594 goto err;
595 }
596 memcpy(p,s->session->session_id,i);
597 p+=i;
598 }
599
600 /* cookie stuff */
601 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
602 {
603 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
604 goto err;
605 }
606 *(p++) = s->d1->cookie_len;
607 memcpy(p, s->d1->cookie, s->d1->cookie_len);
608 p += s->d1->cookie_len;
609
610 /* Ciphers supported */
611 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
612 if (i == 0)
613 {
614 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
615 goto err;
616 }
617 s2n(i,p);
618 p+=i;
619
620 /* COMPRESSION */
621 if (s->ctx->comp_methods == NULL)
622 j=0;
623 else
624 j=sk_SSL_COMP_num(s->ctx->comp_methods);
625 *(p++)=1+j;
626 for (i=0; i<j; i++)
627 {
628 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
629 *(p++)=comp->id;
630 }
631 *(p++)=0; /* Add the NULL method */
632
633 l=(p-d);
634 d=buf;
635
636 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
637
638 s->state=SSL3_ST_CW_CLNT_HELLO_B;
639 /* number of bytes to write */
640 s->init_num=p-buf;
641 s->init_off=0;
642
643 /* buffer the message to handle re-xmits */
644 dtls1_buffer_message(s, 0);
645 }
646
647 /* SSL3_ST_CW_CLNT_HELLO_B */
648 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
649 err:
650 return(-1);
651 }
652
653 static int dtls1_get_hello_verify(SSL *s)
654 {
655 int n, al, ok = 0;
656 unsigned char *data;
657 unsigned int cookie_len;
658
659 n=s->method->ssl_get_message(s,
660 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
661 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
662 -1,
663 s->max_cert_list,
664 &ok);
665
666 if (!ok) return((int)n);
667
668 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
669 {
670 s->d1->send_cookie = 0;
671 s->s3->tmp.reuse_message=1;
672 return(1);
673 }
674
675 data = (unsigned char *)s->init_msg;
676
677 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
678 {
679 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
680 s->version=(s->version&0xff00)|data[1];
681 al = SSL_AD_PROTOCOL_VERSION;
682 goto f_err;
683 }
684 data+=2;
685
686 cookie_len = *(data++);
687 if ( cookie_len > sizeof(s->d1->cookie))
688 {
689 al=SSL_AD_ILLEGAL_PARAMETER;
690 goto f_err;
691 }
692
693 memcpy(s->d1->cookie, data, cookie_len);
694 s->d1->cookie_len = cookie_len;
695
696 s->d1->send_cookie = 1;
697 return 1;
698
699 f_err:
700 ssl3_send_alert(s, SSL3_AL_FATAL, al);
701 return -1;
702 }
703
704 int dtls1_send_client_key_exchange(SSL *s)
705 {
706 unsigned char *p,*d;
707 int n;
708 unsigned long alg_k;
709 #ifndef OPENSSL_NO_RSA
710 unsigned char *q;
711 EVP_PKEY *pkey=NULL;
712 #endif
713 #ifndef OPENSSL_NO_KRB5
714 KSSL_ERR kssl_err;
715 #endif /* OPENSSL_NO_KRB5 */
716
717 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
718 {
719 d=(unsigned char *)s->init_buf->data;
720 p= &(d[DTLS1_HM_HEADER_LENGTH]);
721
722 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
723
724 /* Fool emacs indentation */
725 if (0) {}
726 #ifndef OPENSSL_NO_RSA
727 else if (alg_k & SSL_kRSA)
728 {
729 RSA *rsa;
730 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
731
732 if (s->session->sess_cert->peer_rsa_tmp != NULL)
733 rsa=s->session->sess_cert->peer_rsa_tmp;
734 else
735 {
736 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
737 if ((pkey == NULL) ||
738 (pkey->type != EVP_PKEY_RSA) ||
739 (pkey->pkey.rsa == NULL))
740 {
741 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
742 goto err;
743 }
744 rsa=pkey->pkey.rsa;
745 EVP_PKEY_free(pkey);
746 }
747
748 tmp_buf[0]=s->client_version>>8;
749 tmp_buf[1]=s->client_version&0xff;
750 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
751 goto err;
752
753 s->session->master_key_length=sizeof tmp_buf;
754
755 q=p;
756 /* Fix buf for TLS and [incidentally] DTLS */
757 if (s->version > SSL3_VERSION)
758 p+=2;
759 n=RSA_public_encrypt(sizeof tmp_buf,
760 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
761 #ifdef PKCS1_CHECK
762 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
763 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
764 #endif
765 if (n <= 0)
766 {
767 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
768 goto err;
769 }
770
771 /* Fix buf for TLS and [incidentally] DTLS */
772 if (s->version > SSL3_VERSION)
773 {
774 s2n(n,q);
775 n+=2;
776 }
777
778 s->session->master_key_length=
779 s->method->ssl3_enc->generate_master_secret(s,
780 s->session->master_key,
781 tmp_buf,sizeof tmp_buf);
782 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
783 }
784 #endif
785 #ifndef OPENSSL_NO_KRB5
786 else if (alg_k & SSL_kKRB5)
787 {
788 krb5_error_code krb5rc;
789 KSSL_CTX *kssl_ctx = s->kssl_ctx;
790 /* krb5_data krb5_ap_req; */
791 krb5_data *enc_ticket;
792 krb5_data authenticator, *authp = NULL;
793 EVP_CIPHER_CTX ciph_ctx;
794 EVP_CIPHER *enc = NULL;
795 unsigned char iv[EVP_MAX_IV_LENGTH];
796 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
797 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
798 + EVP_MAX_IV_LENGTH];
799 int padl, outl = sizeof(epms);
800
801 EVP_CIPHER_CTX_init(&ciph_ctx);
802
803 #ifdef KSSL_DEBUG
804 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
805 alg_k, SSL_kKRB5);
806 #endif /* KSSL_DEBUG */
807
808 authp = NULL;
809 #ifdef KRB5SENDAUTH
810 if (KRB5SENDAUTH) authp = &authenticator;
811 #endif /* KRB5SENDAUTH */
812
813 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
814 &kssl_err);
815 enc = kssl_map_enc(kssl_ctx->enctype);
816 if (enc == NULL)
817 goto err;
818 #ifdef KSSL_DEBUG
819 {
820 printf("kssl_cget_tkt rtn %d\n", krb5rc);
821 if (krb5rc && kssl_err.text)
822 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
823 }
824 #endif /* KSSL_DEBUG */
825
826 if (krb5rc)
827 {
828 ssl3_send_alert(s,SSL3_AL_FATAL,
829 SSL_AD_HANDSHAKE_FAILURE);
830 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
831 kssl_err.reason);
832 goto err;
833 }
834
835 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
836 ** in place of RFC 2712 KerberosWrapper, as in:
837 **
838 ** Send ticket (copy to *p, set n = length)
839 ** n = krb5_ap_req.length;
840 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
841 ** if (krb5_ap_req.data)
842 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
843 **
844 ** Now using real RFC 2712 KerberosWrapper
845 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
846 ** Note: 2712 "opaque" types are here replaced
847 ** with a 2-byte length followed by the value.
848 ** Example:
849 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
850 ** Where "xx xx" = length bytes. Shown here with
851 ** optional authenticator omitted.
852 */
853
854 /* KerberosWrapper.Ticket */
855 s2n(enc_ticket->length,p);
856 memcpy(p, enc_ticket->data, enc_ticket->length);
857 p+= enc_ticket->length;
858 n = enc_ticket->length + 2;
859
860 /* KerberosWrapper.Authenticator */
861 if (authp && authp->length)
862 {
863 s2n(authp->length,p);
864 memcpy(p, authp->data, authp->length);
865 p+= authp->length;
866 n+= authp->length + 2;
867
868 free(authp->data);
869 authp->data = NULL;
870 authp->length = 0;
871 }
872 else
873 {
874 s2n(0,p);/* null authenticator length */
875 n+=2;
876 }
877
878 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
879 goto err;
880
881 /* 20010420 VRS. Tried it this way; failed.
882 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
883 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
884 ** kssl_ctx->length);
885 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
886 */
887
888 memset(iv, 0, sizeof iv); /* per RFC 1510 */
889 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
890 kssl_ctx->key,iv);
891 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
892 sizeof tmp_buf);
893 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
894 outl += padl;
895 if (outl > sizeof epms)
896 {
897 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
898 goto err;
899 }
900 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
901
902 /* KerberosWrapper.EncryptedPreMasterSecret */
903 s2n(outl,p);
904 memcpy(p, epms, outl);
905 p+=outl;
906 n+=outl + 2;
907
908 s->session->master_key_length=
909 s->method->ssl3_enc->generate_master_secret(s,
910 s->session->master_key,
911 tmp_buf, sizeof tmp_buf);
912
913 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
914 OPENSSL_cleanse(epms, outl);
915 }
916 #endif
917 #ifndef OPENSSL_NO_DH
918 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
919 {
920 DH *dh_srvr,*dh_clnt;
921
922 if (s->session->sess_cert->peer_dh_tmp != NULL)
923 dh_srvr=s->session->sess_cert->peer_dh_tmp;
924 else
925 {
926 /* we get them from the cert */
927 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
928 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
929 goto err;
930 }
931
932 /* generate a new random key */
933 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
934 {
935 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
936 goto err;
937 }
938 if (!DH_generate_key(dh_clnt))
939 {
940 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
941 goto err;
942 }
943
944 /* use the 'p' output buffer for the DH key, but
945 * make sure to clear it out afterwards */
946
947 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
948
949 if (n <= 0)
950 {
951 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
952 goto err;
953 }
954
955 /* generate master key from the result */
956 s->session->master_key_length=
957 s->method->ssl3_enc->generate_master_secret(s,
958 s->session->master_key,p,n);
959 /* clean up */
960 memset(p,0,n);
961
962 /* send off the data */
963 n=BN_num_bytes(dh_clnt->pub_key);
964 s2n(n,p);
965 BN_bn2bin(dh_clnt->pub_key,p);
966 n+=2;
967
968 DH_free(dh_clnt);
969
970 /* perhaps clean things up a bit EAY EAY EAY EAY*/
971 }
972 #endif
973 else
974 {
975 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
976 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
977 goto err;
978 }
979
980 d = dtls1_set_message_header(s, d,
981 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
982 /*
983 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
984 l2n3(n,d);
985 l2n(s->d1->handshake_write_seq,d);
986 s->d1->handshake_write_seq++;
987 */
988
989 s->state=SSL3_ST_CW_KEY_EXCH_B;
990 /* number of bytes to write */
991 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
992 s->init_off=0;
993
994 /* buffer the message to handle re-xmits */
995 dtls1_buffer_message(s, 0);
996 }
997
998 /* SSL3_ST_CW_KEY_EXCH_B */
999 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1000 err:
1001 return(-1);
1002 }
1003
1004 int dtls1_send_client_verify(SSL *s)
1005 {
1006 unsigned char *p,*d;
1007 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1008 EVP_PKEY *pkey;
1009 #ifndef OPENSSL_NO_RSA
1010 unsigned u=0;
1011 #endif
1012 unsigned long n;
1013 #ifndef OPENSSL_NO_DSA
1014 int j;
1015 #endif
1016
1017 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1018 {
1019 d=(unsigned char *)s->init_buf->data;
1020 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1021 pkey=s->cert->key->privatekey;
1022
1023 s->method->ssl3_enc->cert_verify_mac(s,
1024 NID_sha1,
1025 &(data[MD5_DIGEST_LENGTH]));
1026
1027 #ifndef OPENSSL_NO_RSA
1028 if (pkey->type == EVP_PKEY_RSA)
1029 {
1030 s->method->ssl3_enc->cert_verify_mac(s,
1031 NID_md5,
1032 &(data[0]));
1033 if (RSA_sign(NID_md5_sha1, data,
1034 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1035 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1036 {
1037 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1038 goto err;
1039 }
1040 s2n(u,p);
1041 n=u+2;
1042 }
1043 else
1044 #endif
1045 #ifndef OPENSSL_NO_DSA
1046 if (pkey->type == EVP_PKEY_DSA)
1047 {
1048 if (!DSA_sign(pkey->save_type,
1049 &(data[MD5_DIGEST_LENGTH]),
1050 SHA_DIGEST_LENGTH,&(p[2]),
1051 (unsigned int *)&j,pkey->pkey.dsa))
1052 {
1053 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1054 goto err;
1055 }
1056 s2n(j,p);
1057 n=j+2;
1058 }
1059 else
1060 #endif
1061 {
1062 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1063 goto err;
1064 }
1065
1066 d = dtls1_set_message_header(s, d,
1067 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1068
1069 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1070 s->init_off=0;
1071
1072 /* buffer the message to handle re-xmits */
1073 dtls1_buffer_message(s, 0);
1074
1075 s->state = SSL3_ST_CW_CERT_VRFY_B;
1076 }
1077
1078 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1079 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1080 err:
1081 return(-1);
1082 }
1083
1084 int dtls1_send_client_certificate(SSL *s)
1085 {
1086 X509 *x509=NULL;
1087 EVP_PKEY *pkey=NULL;
1088 int i;
1089 unsigned long l;
1090
1091 if (s->state == SSL3_ST_CW_CERT_A)
1092 {
1093 if ((s->cert == NULL) ||
1094 (s->cert->key->x509 == NULL) ||
1095 (s->cert->key->privatekey == NULL))
1096 s->state=SSL3_ST_CW_CERT_B;
1097 else
1098 s->state=SSL3_ST_CW_CERT_C;
1099 }
1100
1101 /* We need to get a client cert */
1102 if (s->state == SSL3_ST_CW_CERT_B)
1103 {
1104 /* If we get an error, we need to
1105 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1106 * We then get retied later */
1107 i=0;
1108 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1109 if (i < 0)
1110 {
1111 s->rwstate=SSL_X509_LOOKUP;
1112 return(-1);
1113 }
1114 s->rwstate=SSL_NOTHING;
1115 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1116 {
1117 s->state=SSL3_ST_CW_CERT_B;
1118 if ( !SSL_use_certificate(s,x509) ||
1119 !SSL_use_PrivateKey(s,pkey))
1120 i=0;
1121 }
1122 else if (i == 1)
1123 {
1124 i=0;
1125 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1126 }
1127
1128 if (x509 != NULL) X509_free(x509);
1129 if (pkey != NULL) EVP_PKEY_free(pkey);
1130 if (i == 0)
1131 {
1132 if (s->version == SSL3_VERSION)
1133 {
1134 s->s3->tmp.cert_req=0;
1135 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1136 return(1);
1137 }
1138 else
1139 {
1140 s->s3->tmp.cert_req=2;
1141 }
1142 }
1143
1144 /* Ok, we have a cert */
1145 s->state=SSL3_ST_CW_CERT_C;
1146 }
1147
1148 if (s->state == SSL3_ST_CW_CERT_C)
1149 {
1150 s->state=SSL3_ST_CW_CERT_D;
1151 l=dtls1_output_cert_chain(s,
1152 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1153 s->init_num=(int)l;
1154 s->init_off=0;
1155
1156 /* set header called by dtls1_output_cert_chain() */
1157
1158 /* buffer the message to handle re-xmits */
1159 dtls1_buffer_message(s, 0);
1160 }
1161 /* SSL3_ST_CW_CERT_D */
1162 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1163 }
1164
1165
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