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turns printfs back on
[freebsd-src/fkvm-freebsd.git] / crypto / openssl / ssl / d1_clnt.c
blobe8b60a45d225a6a215d7fe99487866a3ebac7b38
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) 1999-2005 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 "kssl_lcl.h"
119 #include <openssl/buffer.h>
120 #include <openssl/rand.h>
121 #include <openssl/objects.h>
122 #include <openssl/evp.h>
123 #include <openssl/md5.h>
124 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
126 #endif
127
128 static SSL_METHOD *dtls1_get_client_method(int ver);
129 static int dtls1_get_hello_verify(SSL *s);
130
131 static 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),l;
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->algorithms & 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 l=s->s3->tmp.new_cipher->algorithms;
339 /* EAY EAY EAY need to check for DH fix cert
340 * sent back */
341 /* For TLS, cert_req is set to 2, so a cert chain
342 * of nothing is sent, but no verify packet is sent */
343 if (s->s3->tmp.cert_req == 1)
344 {
345 s->state=SSL3_ST_CW_CERT_VRFY_A;
346 }
347 else
348 {
349 s->state=SSL3_ST_CW_CHANGE_A;
350 s->s3->change_cipher_spec=0;
351 }
352
353 s->init_num=0;
354 break;
355
356 case SSL3_ST_CW_CERT_VRFY_A:
357 case SSL3_ST_CW_CERT_VRFY_B:
358 ret=dtls1_send_client_verify(s);
359 if (ret <= 0) goto end;
360 s->state=SSL3_ST_CW_CHANGE_A;
361 s->init_num=0;
362 s->s3->change_cipher_spec=0;
363 break;
364
365 case SSL3_ST_CW_CHANGE_A:
366 case SSL3_ST_CW_CHANGE_B:
367 ret=dtls1_send_change_cipher_spec(s,
368 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
369 if (ret <= 0) goto end;
370 s->state=SSL3_ST_CW_FINISHED_A;
371 s->init_num=0;
372
373 s->session->cipher=s->s3->tmp.new_cipher;
374 #ifdef OPENSSL_NO_COMP
375 s->session->compress_meth=0;
376 #else
377 if (s->s3->tmp.new_compression == NULL)
378 s->session->compress_meth=0;
379 else
380 s->session->compress_meth=
381 s->s3->tmp.new_compression->id;
382 #endif
383 if (!s->method->ssl3_enc->setup_key_block(s))
384 {
385 ret= -1;
386 goto end;
387 }
388
389 if (!s->method->ssl3_enc->change_cipher_state(s,
390 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
391 {
392 ret= -1;
393 goto end;
394 }
395
396 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
397 break;
398
399 case SSL3_ST_CW_FINISHED_A:
400 case SSL3_ST_CW_FINISHED_B:
401 ret=dtls1_send_finished(s,
402 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
403 s->method->ssl3_enc->client_finished_label,
404 s->method->ssl3_enc->client_finished_label_len);
405 if (ret <= 0) goto end;
406 s->state=SSL3_ST_CW_FLUSH;
407
408 /* clear flags */
409 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
410 if (s->hit)
411 {
412 s->s3->tmp.next_state=SSL_ST_OK;
413 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
414 {
415 s->state=SSL_ST_OK;
416 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
417 s->s3->delay_buf_pop_ret=0;
418 }
419 }
420 else
421 {
422 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
423 }
424 s->init_num=0;
425 break;
426
427 case SSL3_ST_CR_FINISHED_A:
428 case SSL3_ST_CR_FINISHED_B:
429
430 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
431 SSL3_ST_CR_FINISHED_B);
432 if (ret <= 0) goto end;
433
434 if (s->hit)
435 s->state=SSL3_ST_CW_CHANGE_A;
436 else
437 s->state=SSL_ST_OK;
438 s->init_num=0;
439 break;
440
441 case SSL3_ST_CW_FLUSH:
442 /* number of bytes to be flushed */
443 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
444 if (num1 > 0)
445 {
446 s->rwstate=SSL_WRITING;
447 num1=BIO_flush(s->wbio);
448 if (num1 <= 0) { ret= -1; goto end; }
449 s->rwstate=SSL_NOTHING;
450 }
451
452 s->state=s->s3->tmp.next_state;
453 break;
454
455 case SSL_ST_OK:
456 /* clean a few things up */
457 ssl3_cleanup_key_block(s);
458
459 #if 0
460 if (s->init_buf != NULL)
461 {
462 BUF_MEM_free(s->init_buf);
463 s->init_buf=NULL;
464 }
465 #endif
466
467 /* If we are not 'joining' the last two packets,
468 * remove the buffering now */
469 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
470 ssl_free_wbio_buffer(s);
471 /* else do it later in ssl3_write */
472
473 s->init_num=0;
474 s->new_session=0;
475
476 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
477 if (s->hit) s->ctx->stats.sess_hit++;
478
479 ret=1;
480 /* s->server=0; */
481 s->handshake_func=dtls1_connect;
482 s->ctx->stats.sess_connect_good++;
483
484 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
485
486 /* done with handshaking */
487 s->d1->handshake_read_seq = 0;
488 goto end;
489 /* break; */
490
491 default:
492 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
493 ret= -1;
494 goto end;
495 /* break; */
496 }
497
498 /* did we do anything */
499 if (!s->s3->tmp.reuse_message && !skip)
500 {
501 if (s->debug)
502 {
503 if ((ret=BIO_flush(s->wbio)) <= 0)
504 goto end;
505 }
506
507 if ((cb != NULL) && (s->state != state))
508 {
509 new_state=s->state;
510 s->state=state;
511 cb(s,SSL_CB_CONNECT_LOOP,1);
512 s->state=new_state;
513 }
514 }
515 skip=0;
516 }
517 end:
518 s->in_handshake--;
519 if (buf != NULL)
520 BUF_MEM_free(buf);
521 if (cb != NULL)
522 cb(s,SSL_CB_CONNECT_EXIT,ret);
523 return(ret);
524 }
525
526 int dtls1_client_hello(SSL *s)
527 {
528 unsigned char *buf;
529 unsigned char *p,*d;
530 unsigned int i,j;
531 unsigned long Time,l;
532 SSL_COMP *comp;
533
534 buf=(unsigned char *)s->init_buf->data;
535 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
536 {
537 if ((s->session == NULL) ||
538 (s->session->ssl_version != s->version) ||
539 (s->session->not_resumable))
540 {
541 if (!ssl_get_new_session(s,0))
542 goto err;
543 }
544 /* else use the pre-loaded session */
545
546 p=s->s3->client_random;
547 Time=(unsigned long)time(NULL); /* Time */
548 l2n(Time,p);
549 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
550
551 /* Do the message type and length last */
552 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
553
554 *(p++)=s->version>>8;
555 *(p++)=s->version&0xff;
556 s->client_version=s->version;
557
558 /* Random stuff */
559 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
560 p+=SSL3_RANDOM_SIZE;
561
562 /* Session ID */
563 if (s->new_session)
564 i=0;
565 else
566 i=s->session->session_id_length;
567 *(p++)=i;
568 if (i != 0)
569 {
570 if (i > sizeof s->session->session_id)
571 {
572 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
573 goto err;
574 }
575 memcpy(p,s->session->session_id,i);
576 p+=i;
577 }
578
579 /* cookie stuff */
580 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
581 {
582 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
583 goto err;
584 }
585 *(p++) = s->d1->cookie_len;
586 memcpy(p, s->d1->cookie, s->d1->cookie_len);
587 p += s->d1->cookie_len;
588
589 /* Ciphers supported */
590 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
591 if (i == 0)
592 {
593 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
594 goto err;
595 }
596 s2n(i,p);
597 p+=i;
598
599 /* COMPRESSION */
600 if (s->ctx->comp_methods == NULL)
601 j=0;
602 else
603 j=sk_SSL_COMP_num(s->ctx->comp_methods);
604 *(p++)=1+j;
605 for (i=0; i<j; i++)
606 {
607 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
608 *(p++)=comp->id;
609 }
610 *(p++)=0; /* Add the NULL method */
611
612 l=(p-d);
613 d=buf;
614
615 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
616
617 s->state=SSL3_ST_CW_CLNT_HELLO_B;
618 /* number of bytes to write */
619 s->init_num=p-buf;
620 s->init_off=0;
621
622 /* buffer the message to handle re-xmits */
623 dtls1_buffer_message(s, 0);
624 }
625
626 /* SSL3_ST_CW_CLNT_HELLO_B */
627 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
628 err:
629 return(-1);
630 }
631
632 static int dtls1_get_hello_verify(SSL *s)
633 {
634 int n, al, ok = 0;
635 unsigned char *data;
636 unsigned int cookie_len;
637
638 n=s->method->ssl_get_message(s,
639 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
640 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
641 -1,
642 s->max_cert_list,
643 &ok);
644
645 if (!ok) return((int)n);
646
647 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
648 {
649 s->d1->send_cookie = 0;
650 s->s3->tmp.reuse_message=1;
651 return(1);
652 }
653
654 data = (unsigned char *)s->init_msg;
655
656 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
657 {
658 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
659 s->version=(s->version&0xff00)|data[1];
660 al = SSL_AD_PROTOCOL_VERSION;
661 goto f_err;
662 }
663 data+=2;
664
665 cookie_len = *(data++);
666 if ( cookie_len > sizeof(s->d1->cookie))
667 {
668 al=SSL_AD_ILLEGAL_PARAMETER;
669 goto f_err;
670 }
671
672 memcpy(s->d1->cookie, data, cookie_len);
673 s->d1->cookie_len = cookie_len;
674
675 s->d1->send_cookie = 1;
676 return 1;
677
678 f_err:
679 ssl3_send_alert(s, SSL3_AL_FATAL, al);
680 return -1;
681 }
682
683 int dtls1_send_client_key_exchange(SSL *s)
684 {
685 unsigned char *p,*d;
686 int n;
687 unsigned long l;
688 #ifndef OPENSSL_NO_RSA
689 unsigned char *q;
690 EVP_PKEY *pkey=NULL;
691 #endif
692 #ifndef OPENSSL_NO_KRB5
693 KSSL_ERR kssl_err;
694 #endif /* OPENSSL_NO_KRB5 */
695
696 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
697 {
698 d=(unsigned char *)s->init_buf->data;
699 p= &(d[DTLS1_HM_HEADER_LENGTH]);
700
701 l=s->s3->tmp.new_cipher->algorithms;
702
703 /* Fool emacs indentation */
704 if (0) {}
705 #ifndef OPENSSL_NO_RSA
706 else if (l & SSL_kRSA)
707 {
708 RSA *rsa;
709 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
710
711 if (s->session->sess_cert->peer_rsa_tmp != NULL)
712 rsa=s->session->sess_cert->peer_rsa_tmp;
713 else
714 {
715 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
716 if ((pkey == NULL) ||
717 (pkey->type != EVP_PKEY_RSA) ||
718 (pkey->pkey.rsa == NULL))
719 {
720 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
721 goto err;
722 }
723 rsa=pkey->pkey.rsa;
724 EVP_PKEY_free(pkey);
725 }
726
727 tmp_buf[0]=s->client_version>>8;
728 tmp_buf[1]=s->client_version&0xff;
729 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
730 goto err;
731
732 s->session->master_key_length=sizeof tmp_buf;
733
734 q=p;
735 /* Fix buf for TLS and beyond */
736 if (s->version > SSL3_VERSION)
737 p+=2;
738 n=RSA_public_encrypt(sizeof tmp_buf,
739 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
740 #ifdef PKCS1_CHECK
741 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
742 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
743 #endif
744 if (n <= 0)
745 {
746 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
747 goto err;
748 }
749
750 /* Fix buf for TLS and beyond */
751 if (s->version > SSL3_VERSION)
752 {
753 s2n(n,q);
754 n+=2;
755 }
756
757 s->session->master_key_length=
758 s->method->ssl3_enc->generate_master_secret(s,
759 s->session->master_key,
760 tmp_buf,sizeof tmp_buf);
761 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
762 }
763 #endif
764 #ifndef OPENSSL_NO_KRB5
765 else if (l & SSL_kKRB5)
766 {
767 krb5_error_code krb5rc;
768 KSSL_CTX *kssl_ctx = s->kssl_ctx;
769 /* krb5_data krb5_ap_req; */
770 krb5_data *enc_ticket;
771 krb5_data authenticator, *authp = NULL;
772 EVP_CIPHER_CTX ciph_ctx;
773 EVP_CIPHER *enc = NULL;
774 unsigned char iv[EVP_MAX_IV_LENGTH];
775 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
776 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
777 + EVP_MAX_IV_LENGTH];
778 int padl, outl = sizeof(epms);
779
780 EVP_CIPHER_CTX_init(&ciph_ctx);
781
782 #ifdef KSSL_DEBUG
783 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
784 l, SSL_kKRB5);
785 #endif /* KSSL_DEBUG */
786
787 authp = NULL;
788 #ifdef KRB5SENDAUTH
789 if (KRB5SENDAUTH) authp = &authenticator;
790 #endif /* KRB5SENDAUTH */
791
792 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
793 &kssl_err);
794 enc = kssl_map_enc(kssl_ctx->enctype);
795 if (enc == NULL)
796 goto err;
797 #ifdef KSSL_DEBUG
798 {
799 printf("kssl_cget_tkt rtn %d\n", krb5rc);
800 if (krb5rc && kssl_err.text)
801 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
802 }
803 #endif /* KSSL_DEBUG */
804
805 if (krb5rc)
806 {
807 ssl3_send_alert(s,SSL3_AL_FATAL,
808 SSL_AD_HANDSHAKE_FAILURE);
809 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
810 kssl_err.reason);
811 goto err;
812 }
813
814 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
815 ** in place of RFC 2712 KerberosWrapper, as in:
816 **
817 ** Send ticket (copy to *p, set n = length)
818 ** n = krb5_ap_req.length;
819 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
820 ** if (krb5_ap_req.data)
821 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
822 **
823 ** Now using real RFC 2712 KerberosWrapper
824 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
825 ** Note: 2712 "opaque" types are here replaced
826 ** with a 2-byte length followed by the value.
827 ** Example:
828 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
829 ** Where "xx xx" = length bytes. Shown here with
830 ** optional authenticator omitted.
831 */
832
833 /* KerberosWrapper.Ticket */
834 s2n(enc_ticket->length,p);
835 memcpy(p, enc_ticket->data, enc_ticket->length);
836 p+= enc_ticket->length;
837 n = enc_ticket->length + 2;
838
839 /* KerberosWrapper.Authenticator */
840 if (authp && authp->length)
841 {
842 s2n(authp->length,p);
843 memcpy(p, authp->data, authp->length);
844 p+= authp->length;
845 n+= authp->length + 2;
846
847 free(authp->data);
848 authp->data = NULL;
849 authp->length = 0;
850 }
851 else
852 {
853 s2n(0,p);/* null authenticator length */
854 n+=2;
855 }
856
857 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
858 goto err;
859
860 /* 20010420 VRS. Tried it this way; failed.
861 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
862 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
863 ** kssl_ctx->length);
864 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
865 */
866
867 memset(iv, 0, sizeof iv); /* per RFC 1510 */
868 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
869 kssl_ctx->key,iv);
870 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
871 sizeof tmp_buf);
872 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
873 outl += padl;
874 if (outl > sizeof epms)
875 {
876 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
877 goto err;
878 }
879 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
880
881 /* KerberosWrapper.EncryptedPreMasterSecret */
882 s2n(outl,p);
883 memcpy(p, epms, outl);
884 p+=outl;
885 n+=outl + 2;
886
887 s->session->master_key_length=
888 s->method->ssl3_enc->generate_master_secret(s,
889 s->session->master_key,
890 tmp_buf, sizeof tmp_buf);
891
892 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
893 OPENSSL_cleanse(epms, outl);
894 }
895 #endif
896 #ifndef OPENSSL_NO_DH
897 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
898 {
899 DH *dh_srvr,*dh_clnt;
900
901 if (s->session->sess_cert->peer_dh_tmp != NULL)
902 dh_srvr=s->session->sess_cert->peer_dh_tmp;
903 else
904 {
905 /* we get them from the cert */
906 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
907 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
908 goto err;
909 }
910
911 /* generate a new random key */
912 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
913 {
914 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
915 goto err;
916 }
917 if (!DH_generate_key(dh_clnt))
918 {
919 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
920 goto err;
921 }
922
923 /* use the 'p' output buffer for the DH key, but
924 * make sure to clear it out afterwards */
925
926 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
927
928 if (n <= 0)
929 {
930 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
931 goto err;
932 }
933
934 /* generate master key from the result */
935 s->session->master_key_length=
936 s->method->ssl3_enc->generate_master_secret(s,
937 s->session->master_key,p,n);
938 /* clean up */
939 memset(p,0,n);
940
941 /* send off the data */
942 n=BN_num_bytes(dh_clnt->pub_key);
943 s2n(n,p);
944 BN_bn2bin(dh_clnt->pub_key,p);
945 n+=2;
946
947 DH_free(dh_clnt);
948
949 /* perhaps clean things up a bit EAY EAY EAY EAY*/
950 }
951 #endif
952 else
953 {
954 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
955 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
956 goto err;
957 }
958
959 d = dtls1_set_message_header(s, d,
960 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
961 /*
962 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
963 l2n3(n,d);
964 l2n(s->d1->handshake_write_seq,d);
965 s->d1->handshake_write_seq++;
966 */
967
968 s->state=SSL3_ST_CW_KEY_EXCH_B;
969 /* number of bytes to write */
970 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
971 s->init_off=0;
972
973 /* buffer the message to handle re-xmits */
974 dtls1_buffer_message(s, 0);
975 }
976
977 /* SSL3_ST_CW_KEY_EXCH_B */
978 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
979 err:
980 return(-1);
981 }
982
983 int dtls1_send_client_verify(SSL *s)
984 {
985 unsigned char *p,*d;
986 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
987 EVP_PKEY *pkey;
988 #ifndef OPENSSL_NO_RSA
989 unsigned u=0;
990 #endif
991 unsigned long n;
992 #ifndef OPENSSL_NO_DSA
993 int j;
994 #endif
995
996 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
997 {
998 d=(unsigned char *)s->init_buf->data;
999 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1000 pkey=s->cert->key->privatekey;
1001
1002 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
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 &(s->s3->finish_dgst1),&(data[0]));
1010 if (RSA_sign(NID_md5_sha1, data,
1011 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1012 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1013 {
1014 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1015 goto err;
1016 }
1017 s2n(u,p);
1018 n=u+2;
1019 }
1020 else
1021 #endif
1022 #ifndef OPENSSL_NO_DSA
1023 if (pkey->type == EVP_PKEY_DSA)
1024 {
1025 if (!DSA_sign(pkey->save_type,
1026 &(data[MD5_DIGEST_LENGTH]),
1027 SHA_DIGEST_LENGTH,&(p[2]),
1028 (unsigned int *)&j,pkey->pkey.dsa))
1029 {
1030 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1031 goto err;
1032 }
1033 s2n(j,p);
1034 n=j+2;
1035 }
1036 else
1037 #endif
1038 {
1039 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1040 goto err;
1041 }
1042
1043 d = dtls1_set_message_header(s, d,
1044 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1045
1046 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1047 s->init_off=0;
1048
1049 /* buffer the message to handle re-xmits */
1050 dtls1_buffer_message(s, 0);
1051
1052 s->state = SSL3_ST_CW_CERT_VRFY_B;
1053 }
1054
1055 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1056 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1057 err:
1058 return(-1);
1059 }
1060
1061 int dtls1_send_client_certificate(SSL *s)
1062 {
1063 X509 *x509=NULL;
1064 EVP_PKEY *pkey=NULL;
1065 int i;
1066 unsigned long l;
1067
1068 if (s->state == SSL3_ST_CW_CERT_A)
1069 {
1070 if ((s->cert == NULL) ||
1071 (s->cert->key->x509 == NULL) ||
1072 (s->cert->key->privatekey == NULL))
1073 s->state=SSL3_ST_CW_CERT_B;
1074 else
1075 s->state=SSL3_ST_CW_CERT_C;
1076 }
1077
1078 /* We need to get a client cert */
1079 if (s->state == SSL3_ST_CW_CERT_B)
1080 {
1081 /* If we get an error, we need to
1082 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1083 * We then get retied later */
1084 i=0;
1085 if (s->ctx->client_cert_cb != NULL)
1086 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1087 if (i < 0)
1088 {
1089 s->rwstate=SSL_X509_LOOKUP;
1090 return(-1);
1091 }
1092 s->rwstate=SSL_NOTHING;
1093 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1094 {
1095 s->state=SSL3_ST_CW_CERT_B;
1096 if ( !SSL_use_certificate(s,x509) ||
1097 !SSL_use_PrivateKey(s,pkey))
1098 i=0;
1099 }
1100 else if (i == 1)
1101 {
1102 i=0;
1103 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1104 }
1105
1106 if (x509 != NULL) X509_free(x509);
1107 if (pkey != NULL) EVP_PKEY_free(pkey);
1108 if (i == 0)
1109 {
1110 if (s->version == SSL3_VERSION)
1111 {
1112 s->s3->tmp.cert_req=0;
1113 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1114 return(1);
1115 }
1116 else
1117 {
1118 s->s3->tmp.cert_req=2;
1119 }
1120 }
1121
1122 /* Ok, we have a cert */
1123 s->state=SSL3_ST_CW_CERT_C;
1124 }
1125
1126 if (s->state == SSL3_ST_CW_CERT_C)
1127 {
1128 s->state=SSL3_ST_CW_CERT_D;
1129 l=dtls1_output_cert_chain(s,
1130 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1131 s->init_num=(int)l;
1132 s->init_off=0;
1133
1134 /* set header called by dtls1_output_cert_chain() */
1135
1136 /* buffer the message to handle re-xmits */
1137 dtls1_buffer_message(s, 0);
1138 }
1139 /* SSL3_ST_CW_CERT_D */
1140 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1141 }
1142
1143
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