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Update ssl code to support digests other than MD5+SHA1 in handshake.
[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)
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 {
186 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
187 ret = -1;
188 goto end;
189 }
190
191 /* s->version=SSL3_VERSION; */
192 s->type=SSL_ST_CONNECT;
193
194 if (s->init_buf == NULL)
195 {
196 if ((buf=BUF_MEM_new()) == NULL)
197 {
198 ret= -1;
199 goto end;
200 }
201 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
202 {
203 ret= -1;
204 goto end;
205 }
206 s->init_buf=buf;
207 buf=NULL;
208 }
209
210 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
211
212 /* setup buffing BIO */
213 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
214
215 /* don't push the buffering BIO quite yet */
216
217 ssl3_init_finished_mac(s);
218
219 s->state=SSL3_ST_CW_CLNT_HELLO_A;
220 s->ctx->stats.sess_connect++;
221 s->init_num=0;
222 break;
223
224 case SSL3_ST_CW_CLNT_HELLO_A:
225 case SSL3_ST_CW_CLNT_HELLO_B:
226
227 s->shutdown=0;
228 ret=dtls1_client_hello(s);
229 if (ret <= 0) goto end;
230
231 if ( s->d1->send_cookie)
232 {
233 s->state=SSL3_ST_CW_FLUSH;
234 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
235 }
236 else
237 s->state=SSL3_ST_CR_SRVR_HELLO_A;
238
239 s->init_num=0;
240
241 /* turn on buffering for the next lot of output */
242 if (s->bbio != s->wbio)
243 s->wbio=BIO_push(s->bbio,s->wbio);
244
245 break;
246
247 case SSL3_ST_CR_SRVR_HELLO_A:
248 case SSL3_ST_CR_SRVR_HELLO_B:
249 ret=ssl3_get_server_hello(s);
250 if (ret <= 0) goto end;
251 else
252 {
253 if (s->hit)
254 s->state=SSL3_ST_CR_FINISHED_A;
255 else
256 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
257 }
258 s->init_num=0;
259 break;
260
261 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
262 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
263
264 ret = dtls1_get_hello_verify(s);
265 if ( ret <= 0)
266 goto end;
267 if ( s->d1->send_cookie) /* start again, with a cookie */
268 s->state=SSL3_ST_CW_CLNT_HELLO_A;
269 else
270 s->state = SSL3_ST_CR_CERT_A;
271 s->init_num = 0;
272 break;
273
274 case SSL3_ST_CR_CERT_A:
275 case SSL3_ST_CR_CERT_B:
276 /* Check if it is anon DH */
277 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
278 {
279 ret=ssl3_get_server_certificate(s);
280 if (ret <= 0) goto end;
281 }
282 else
283 skip=1;
284 s->state=SSL3_ST_CR_KEY_EXCH_A;
285 s->init_num=0;
286 break;
287
288 case SSL3_ST_CR_KEY_EXCH_A:
289 case SSL3_ST_CR_KEY_EXCH_B:
290 ret=ssl3_get_key_exchange(s);
291 if (ret <= 0) goto end;
292 s->state=SSL3_ST_CR_CERT_REQ_A;
293 s->init_num=0;
294
295 /* at this point we check that we have the
296 * required stuff from the server */
297 if (!ssl3_check_cert_and_algorithm(s))
298 {
299 ret= -1;
300 goto end;
301 }
302 break;
303
304 case SSL3_ST_CR_CERT_REQ_A:
305 case SSL3_ST_CR_CERT_REQ_B:
306 ret=ssl3_get_certificate_request(s);
307 if (ret <= 0) goto end;
308 s->state=SSL3_ST_CR_SRVR_DONE_A;
309 s->init_num=0;
310 break;
311
312 case SSL3_ST_CR_SRVR_DONE_A:
313 case SSL3_ST_CR_SRVR_DONE_B:
314 ret=ssl3_get_server_done(s);
315 if (ret <= 0) goto end;
316 if (s->s3->tmp.cert_req)
317 s->state=SSL3_ST_CW_CERT_A;
318 else
319 s->state=SSL3_ST_CW_KEY_EXCH_A;
320 s->init_num=0;
321
322 break;
323
324 case SSL3_ST_CW_CERT_A:
325 case SSL3_ST_CW_CERT_B:
326 case SSL3_ST_CW_CERT_C:
327 case SSL3_ST_CW_CERT_D:
328 ret=dtls1_send_client_certificate(s);
329 if (ret <= 0) goto end;
330 s->state=SSL3_ST_CW_KEY_EXCH_A;
331 s->init_num=0;
332 break;
333
334 case SSL3_ST_CW_KEY_EXCH_A:
335 case SSL3_ST_CW_KEY_EXCH_B:
336 ret=dtls1_send_client_key_exchange(s);
337 if (ret <= 0) goto end;
338 /* EAY EAY EAY need to check for DH fix cert
339 * sent back */
340 /* For TLS, cert_req is set to 2, so a cert chain
341 * of nothing is sent, but no verify packet is sent */
342 if (s->s3->tmp.cert_req == 1)
343 {
344 s->state=SSL3_ST_CW_CERT_VRFY_A;
345 }
346 else
347 {
348 s->state=SSL3_ST_CW_CHANGE_A;
349 s->s3->change_cipher_spec=0;
350 }
351
352 s->init_num=0;
353 break;
354
355 case SSL3_ST_CW_CERT_VRFY_A:
356 case SSL3_ST_CW_CERT_VRFY_B:
357 ret=dtls1_send_client_verify(s);
358 if (ret <= 0) goto end;
359 s->state=SSL3_ST_CW_CHANGE_A;
360 s->init_num=0;
361 s->s3->change_cipher_spec=0;
362 break;
363
364 case SSL3_ST_CW_CHANGE_A:
365 case SSL3_ST_CW_CHANGE_B:
366 ret=dtls1_send_change_cipher_spec(s,
367 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
368 if (ret <= 0) goto end;
369 s->state=SSL3_ST_CW_FINISHED_A;
370 s->init_num=0;
371
372 s->session->cipher=s->s3->tmp.new_cipher;
373 #ifdef OPENSSL_NO_COMP
374 s->session->compress_meth=0;
375 #else
376 if (s->s3->tmp.new_compression == NULL)
377 s->session->compress_meth=0;
378 else
379 s->session->compress_meth=
380 s->s3->tmp.new_compression->id;
381 #endif
382 if (!s->method->ssl3_enc->setup_key_block(s))
383 {
384 ret= -1;
385 goto end;
386 }
387
388 if (!s->method->ssl3_enc->change_cipher_state(s,
389 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
390 {
391 ret= -1;
392 goto end;
393 }
394
395 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
396 break;
397
398 case SSL3_ST_CW_FINISHED_A:
399 case SSL3_ST_CW_FINISHED_B:
400 ret=dtls1_send_finished(s,
401 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
402 s->method->ssl3_enc->client_finished_label,
403 s->method->ssl3_enc->client_finished_label_len);
404 if (ret <= 0) goto end;
405 s->state=SSL3_ST_CW_FLUSH;
406
407 /* clear flags */
408 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
409 if (s->hit)
410 {
411 s->s3->tmp.next_state=SSL_ST_OK;
412 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
413 {
414 s->state=SSL_ST_OK;
415 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
416 s->s3->delay_buf_pop_ret=0;
417 }
418 }
419 else
420 {
421 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
422 }
423 s->init_num=0;
424 break;
425
426 case SSL3_ST_CR_FINISHED_A:
427 case SSL3_ST_CR_FINISHED_B:
428
429 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
430 SSL3_ST_CR_FINISHED_B);
431 if (ret <= 0) goto end;
432
433 if (s->hit)
434 s->state=SSL3_ST_CW_CHANGE_A;
435 else
436 s->state=SSL_ST_OK;
437 s->init_num=0;
438 break;
439
440 case SSL3_ST_CW_FLUSH:
441 /* number of bytes to be flushed */
442 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
443 if (num1 > 0)
444 {
445 s->rwstate=SSL_WRITING;
446 num1=BIO_flush(s->wbio);
447 if (num1 <= 0) { ret= -1; goto end; }
448 s->rwstate=SSL_NOTHING;
449 }
450
451 s->state=s->s3->tmp.next_state;
452 break;
453
454 case SSL_ST_OK:
455 /* clean a few things up */
456 ssl3_cleanup_key_block(s);
457
458 #if 0
459 if (s->init_buf != NULL)
460 {
461 BUF_MEM_free(s->init_buf);
462 s->init_buf=NULL;
463 }
464 #endif
465
466 /* If we are not 'joining' the last two packets,
467 * remove the buffering now */
468 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
469 ssl_free_wbio_buffer(s);
470 /* else do it later in ssl3_write */
471
472 s->init_num=0;
473 s->new_session=0;
474
475 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
476 if (s->hit) s->ctx->stats.sess_hit++;
477
478 ret=1;
479 /* s->server=0; */
480 s->handshake_func=dtls1_connect;
481 s->ctx->stats.sess_connect_good++;
482
483 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
484
485 /* done with handshaking */
486 s->d1->handshake_read_seq = 0;
487 goto end;
488 /* break; */
489
490 default:
491 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
492 ret= -1;
493 goto end;
494 /* break; */
495 }
496
497 /* did we do anything */
498 if (!s->s3->tmp.reuse_message && !skip)
499 {
500 if (s->debug)
501 {
502 if ((ret=BIO_flush(s->wbio)) <= 0)
503 goto end;
504 }
505
506 if ((cb != NULL) && (s->state != state))
507 {
508 new_state=s->state;
509 s->state=state;
510 cb(s,SSL_CB_CONNECT_LOOP,1);
511 s->state=new_state;
512 }
513 }
514 skip=0;
515 }
516 end:
517 s->in_handshake--;
518 if (buf != NULL)
519 BUF_MEM_free(buf);
520 if (cb != NULL)
521 cb(s,SSL_CB_CONNECT_EXIT,ret);
522 return(ret);
523 }
524
525 int dtls1_client_hello(SSL *s)
526 {
527 unsigned char *buf;
528 unsigned char *p,*d;
529 unsigned int i,j;
530 unsigned long Time,l;
531 SSL_COMP *comp;
532
533 buf=(unsigned char *)s->init_buf->data;
534 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
535 {
536 if ((s->session == NULL) ||
537 (s->session->ssl_version != s->version) ||
538 (s->session->not_resumable))
539 {
540 if (!ssl_get_new_session(s,0))
541 goto err;
542 }
543 /* else use the pre-loaded session */
544
545 p=s->s3->client_random;
546 Time=(unsigned long)time(NULL); /* Time */
547 l2n(Time,p);
548 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
549
550 /* Do the message type and length last */
551 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
552
553 *(p++)=s->version>>8;
554 *(p++)=s->version&0xff;
555 s->client_version=s->version;
556
557 /* Random stuff */
558 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
559 p+=SSL3_RANDOM_SIZE;
560
561 /* Session ID */
562 if (s->new_session)
563 i=0;
564 else
565 i=s->session->session_id_length;
566 *(p++)=i;
567 if (i != 0)
568 {
569 if (i > sizeof s->session->session_id)
570 {
571 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
572 goto err;
573 }
574 memcpy(p,s->session->session_id,i);
575 p+=i;
576 }
577
578 /* cookie stuff */
579 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
580 {
581 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
582 goto err;
583 }
584 *(p++) = s->d1->cookie_len;
585 memcpy(p, s->d1->cookie, s->d1->cookie_len);
586 p += s->d1->cookie_len;
587
588 /* Ciphers supported */
589 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
590 if (i == 0)
591 {
592 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
593 goto err;
594 }
595 s2n(i,p);
596 p+=i;
597
598 /* COMPRESSION */
599 if (s->ctx->comp_methods == NULL)
600 j=0;
601 else
602 j=sk_SSL_COMP_num(s->ctx->comp_methods);
603 *(p++)=1+j;
604 for (i=0; i<j; i++)
605 {
606 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
607 *(p++)=comp->id;
608 }
609 *(p++)=0; /* Add the NULL method */
610
611 l=(p-d);
612 d=buf;
613
614 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
615
616 s->state=SSL3_ST_CW_CLNT_HELLO_B;
617 /* number of bytes to write */
618 s->init_num=p-buf;
619 s->init_off=0;
620
621 /* buffer the message to handle re-xmits */
622 dtls1_buffer_message(s, 0);
623 }
624
625 /* SSL3_ST_CW_CLNT_HELLO_B */
626 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
627 err:
628 return(-1);
629 }
630
631 static int dtls1_get_hello_verify(SSL *s)
632 {
633 int n, al, ok = 0;
634 unsigned char *data;
635 unsigned int cookie_len;
636
637 n=s->method->ssl_get_message(s,
638 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
639 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
640 -1,
641 s->max_cert_list,
642 &ok);
643
644 if (!ok) return((int)n);
645
646 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
647 {
648 s->d1->send_cookie = 0;
649 s->s3->tmp.reuse_message=1;
650 return(1);
651 }
652
653 data = (unsigned char *)s->init_msg;
654
655 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
656 {
657 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
658 s->version=(s->version&0xff00)|data[1];
659 al = SSL_AD_PROTOCOL_VERSION;
660 goto f_err;
661 }
662 data+=2;
663
664 cookie_len = *(data++);
665 if ( cookie_len > sizeof(s->d1->cookie))
666 {
667 al=SSL_AD_ILLEGAL_PARAMETER;
668 goto f_err;
669 }
670
671 memcpy(s->d1->cookie, data, cookie_len);
672 s->d1->cookie_len = cookie_len;
673
674 s->d1->send_cookie = 1;
675 return 1;
676
677 f_err:
678 ssl3_send_alert(s, SSL3_AL_FATAL, al);
679 return -1;
680 }
681
682 int dtls1_send_client_key_exchange(SSL *s)
683 {
684 unsigned char *p,*d;
685 int n;
686 unsigned long alg_k;
687 #ifndef OPENSSL_NO_RSA
688 unsigned char *q;
689 EVP_PKEY *pkey=NULL;
690 #endif
691 #ifndef OPENSSL_NO_KRB5
692 KSSL_ERR kssl_err;
693 #endif /* OPENSSL_NO_KRB5 */
694
695 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
696 {
697 d=(unsigned char *)s->init_buf->data;
698 p= &(d[DTLS1_HM_HEADER_LENGTH]);
699
700 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
701
702 /* Fool emacs indentation */
703 if (0) {}
704 #ifndef OPENSSL_NO_RSA
705 else if (alg_k & SSL_kRSA)
706 {
707 RSA *rsa;
708 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
709
710 if (s->session->sess_cert->peer_rsa_tmp != NULL)
711 rsa=s->session->sess_cert->peer_rsa_tmp;
712 else
713 {
714 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
715 if ((pkey == NULL) ||
716 (pkey->type != EVP_PKEY_RSA) ||
717 (pkey->pkey.rsa == NULL))
718 {
719 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
720 goto err;
721 }
722 rsa=pkey->pkey.rsa;
723 EVP_PKEY_free(pkey);
724 }
725
726 tmp_buf[0]=s->client_version>>8;
727 tmp_buf[1]=s->client_version&0xff;
728 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
729 goto err;
730
731 s->session->master_key_length=sizeof tmp_buf;
732
733 q=p;
734 /* Fix buf for TLS and beyond */
735 if (s->version > SSL3_VERSION)
736 p+=2;
737 n=RSA_public_encrypt(sizeof tmp_buf,
738 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
739 #ifdef PKCS1_CHECK
740 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
741 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
742 #endif
743 if (n <= 0)
744 {
745 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
746 goto err;
747 }
748
749 /* Fix buf for TLS and beyond */
750 if (s->version > SSL3_VERSION)
751 {
752 s2n(n,q);
753 n+=2;
754 }
755
756 s->session->master_key_length=
757 s->method->ssl3_enc->generate_master_secret(s,
758 s->session->master_key,
759 tmp_buf,sizeof tmp_buf);
760 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
761 }
762 #endif
763 #ifndef OPENSSL_NO_KRB5
764 else if (alg_k & SSL_kKRB5)
765 {
766 krb5_error_code krb5rc;
767 KSSL_CTX *kssl_ctx = s->kssl_ctx;
768 /* krb5_data krb5_ap_req; */
769 krb5_data *enc_ticket;
770 krb5_data authenticator, *authp = NULL;
771 EVP_CIPHER_CTX ciph_ctx;
772 EVP_CIPHER *enc = NULL;
773 unsigned char iv[EVP_MAX_IV_LENGTH];
774 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
775 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
776 + EVP_MAX_IV_LENGTH];
777 int padl, outl = sizeof(epms);
778
779 EVP_CIPHER_CTX_init(&ciph_ctx);
780
781 #ifdef KSSL_DEBUG
782 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
783 alg_k, SSL_kKRB5);
784 #endif /* KSSL_DEBUG */
785
786 authp = NULL;
787 #ifdef KRB5SENDAUTH
788 if (KRB5SENDAUTH) authp = &authenticator;
789 #endif /* KRB5SENDAUTH */
790
791 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
792 &kssl_err);
793 enc = kssl_map_enc(kssl_ctx->enctype);
794 if (enc == NULL)
795 goto err;
796 #ifdef KSSL_DEBUG
797 {
798 printf("kssl_cget_tkt rtn %d\n", krb5rc);
799 if (krb5rc && kssl_err.text)
800 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
801 }
802 #endif /* KSSL_DEBUG */
803
804 if (krb5rc)
805 {
806 ssl3_send_alert(s,SSL3_AL_FATAL,
807 SSL_AD_HANDSHAKE_FAILURE);
808 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
809 kssl_err.reason);
810 goto err;
811 }
812
813 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
814 ** in place of RFC 2712 KerberosWrapper, as in:
815 **
816 ** Send ticket (copy to *p, set n = length)
817 ** n = krb5_ap_req.length;
818 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
819 ** if (krb5_ap_req.data)
820 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
821 **
822 ** Now using real RFC 2712 KerberosWrapper
823 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
824 ** Note: 2712 "opaque" types are here replaced
825 ** with a 2-byte length followed by the value.
826 ** Example:
827 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
828 ** Where "xx xx" = length bytes. Shown here with
829 ** optional authenticator omitted.
830 */
831
832 /* KerberosWrapper.Ticket */
833 s2n(enc_ticket->length,p);
834 memcpy(p, enc_ticket->data, enc_ticket->length);
835 p+= enc_ticket->length;
836 n = enc_ticket->length + 2;
837
838 /* KerberosWrapper.Authenticator */
839 if (authp && authp->length)
840 {
841 s2n(authp->length,p);
842 memcpy(p, authp->data, authp->length);
843 p+= authp->length;
844 n+= authp->length + 2;
845
846 free(authp->data);
847 authp->data = NULL;
848 authp->length = 0;
849 }
850 else
851 {
852 s2n(0,p);/* null authenticator length */
853 n+=2;
854 }
855
856 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
857 goto err;
858
859 /* 20010420 VRS. Tried it this way; failed.
860 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
861 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
862 ** kssl_ctx->length);
863 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
864 */
865
866 memset(iv, 0, sizeof iv); /* per RFC 1510 */
867 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
868 kssl_ctx->key,iv);
869 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
870 sizeof tmp_buf);
871 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
872 outl += padl;
873 if (outl > sizeof epms)
874 {
875 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
876 goto err;
877 }
878 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
879
880 /* KerberosWrapper.EncryptedPreMasterSecret */
881 s2n(outl,p);
882 memcpy(p, epms, outl);
883 p+=outl;
884 n+=outl + 2;
885
886 s->session->master_key_length=
887 s->method->ssl3_enc->generate_master_secret(s,
888 s->session->master_key,
889 tmp_buf, sizeof tmp_buf);
890
891 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
892 OPENSSL_cleanse(epms, outl);
893 }
894 #endif
895 #ifndef OPENSSL_NO_DH
896 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
897 {
898 DH *dh_srvr,*dh_clnt;
899
900 if (s->session->sess_cert->peer_dh_tmp != NULL)
901 dh_srvr=s->session->sess_cert->peer_dh_tmp;
902 else
903 {
904 /* we get them from the cert */
905 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
906 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
907 goto err;
908 }
909
910 /* generate a new random key */
911 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
912 {
913 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
914 goto err;
915 }
916 if (!DH_generate_key(dh_clnt))
917 {
918 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
919 goto err;
920 }
921
922 /* use the 'p' output buffer for the DH key, but
923 * make sure to clear it out afterwards */
924
925 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
926
927 if (n <= 0)
928 {
929 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
930 goto err;
931 }
932
933 /* generate master key from the result */
934 s->session->master_key_length=
935 s->method->ssl3_enc->generate_master_secret(s,
936 s->session->master_key,p,n);
937 /* clean up */
938 memset(p,0,n);
939
940 /* send off the data */
941 n=BN_num_bytes(dh_clnt->pub_key);
942 s2n(n,p);
943 BN_bn2bin(dh_clnt->pub_key,p);
944 n+=2;
945
946 DH_free(dh_clnt);
947
948 /* perhaps clean things up a bit EAY EAY EAY EAY*/
949 }
950 #endif
951 else
952 {
953 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
954 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
955 goto err;
956 }
957
958 d = dtls1_set_message_header(s, d,
959 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
960 /*
961 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
962 l2n3(n,d);
963 l2n(s->d1->handshake_write_seq,d);
964 s->d1->handshake_write_seq++;
965 */
966
967 s->state=SSL3_ST_CW_KEY_EXCH_B;
968 /* number of bytes to write */
969 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
970 s->init_off=0;
971
972 /* buffer the message to handle re-xmits */
973 dtls1_buffer_message(s, 0);
974 }
975
976 /* SSL3_ST_CW_KEY_EXCH_B */
977 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
978 err:
979 return(-1);
980 }
981
982 int dtls1_send_client_verify(SSL *s)
983 {
984 unsigned char *p,*d;
985 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
986 EVP_PKEY *pkey;
987 #ifndef OPENSSL_NO_RSA
988 unsigned u=0;
989 #endif
990 unsigned long n;
991 #ifndef OPENSSL_NO_DSA
992 int j;
993 #endif
994
995 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
996 {
997 d=(unsigned char *)s->init_buf->data;
998 p= &(d[DTLS1_HM_HEADER_LENGTH]);
999 pkey=s->cert->key->privatekey;
1000
1001 s->method->ssl3_enc->cert_verify_mac(s,
1002 NID_sha1,
1003 &(data[MD5_DIGEST_LENGTH]));
1004
1005 #ifndef OPENSSL_NO_RSA
1006 if (pkey->type == EVP_PKEY_RSA)
1007 {
1008 s->method->ssl3_enc->cert_verify_mac(s,
1009 NID_md5,
1010 &(data[0]));
1011 if (RSA_sign(NID_md5_sha1, data,
1012 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1013 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1014 {
1015 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1016 goto err;
1017 }
1018 s2n(u,p);
1019 n=u+2;
1020 }
1021 else
1022 #endif
1023 #ifndef OPENSSL_NO_DSA
1024 if (pkey->type == EVP_PKEY_DSA)
1025 {
1026 if (!DSA_sign(pkey->save_type,
1027 &(data[MD5_DIGEST_LENGTH]),
1028 SHA_DIGEST_LENGTH,&(p[2]),
1029 (unsigned int *)&j,pkey->pkey.dsa))
1030 {
1031 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1032 goto err;
1033 }
1034 s2n(j,p);
1035 n=j+2;
1036 }
1037 else
1038 #endif
1039 {
1040 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1041 goto err;
1042 }
1043
1044 d = dtls1_set_message_header(s, d,
1045 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1046
1047 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1048 s->init_off=0;
1049
1050 /* buffer the message to handle re-xmits */
1051 dtls1_buffer_message(s, 0);
1052
1053 s->state = SSL3_ST_CW_CERT_VRFY_B;
1054 }
1055
1056 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1057 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1058 err:
1059 return(-1);
1060 }
1061
1062 int dtls1_send_client_certificate(SSL *s)
1063 {
1064 X509 *x509=NULL;
1065 EVP_PKEY *pkey=NULL;
1066 int i;
1067 unsigned long l;
1068
1069 if (s->state == SSL3_ST_CW_CERT_A)
1070 {
1071 if ((s->cert == NULL) ||
1072 (s->cert->key->x509 == NULL) ||
1073 (s->cert->key->privatekey == NULL))
1074 s->state=SSL3_ST_CW_CERT_B;
1075 else
1076 s->state=SSL3_ST_CW_CERT_C;
1077 }
1078
1079 /* We need to get a client cert */
1080 if (s->state == SSL3_ST_CW_CERT_B)
1081 {
1082 /* If we get an error, we need to
1083 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1084 * We then get retied later */
1085 i=0;
1086 if (s->ctx->client_cert_cb != NULL)
1087 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1088 if (i < 0)
1089 {
1090 s->rwstate=SSL_X509_LOOKUP;
1091 return(-1);
1092 }
1093 s->rwstate=SSL_NOTHING;
1094 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1095 {
1096 s->state=SSL3_ST_CW_CERT_B;
1097 if ( !SSL_use_certificate(s,x509) ||
1098 !SSL_use_PrivateKey(s,pkey))
1099 i=0;
1100 }
1101 else if (i == 1)
1102 {
1103 i=0;
1104 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1105 }
1106
1107 if (x509 != NULL) X509_free(x509);
1108 if (pkey != NULL) EVP_PKEY_free(pkey);
1109 if (i == 0)
1110 {
1111 if (s->version == SSL3_VERSION)
1112 {
1113 s->s3->tmp.cert_req=0;
1114 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1115 return(1);
1116 }
1117 else
1118 {
1119 s->s3->tmp.cert_req=2;
1120 }
1121 }
1122
1123 /* Ok, we have a cert */
1124 s->state=SSL3_ST_CW_CERT_C;
1125 }
1126
1127 if (s->state == SSL3_ST_CW_CERT_C)
1128 {
1129 s->state=SSL3_ST_CW_CERT_D;
1130 l=dtls1_output_cert_chain(s,
1131 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1132 s->init_num=(int)l;
1133 s->init_off=0;
1134
1135 /* set header called by dtls1_output_cert_chain() */
1136
1137 /* buffer the message to handle re-xmits */
1138 dtls1_buffer_message(s, 0);
1139 }
1140 /* SSL3_ST_CW_CERT_D */
1141 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1142 }
1143
1144
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