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Initialize SSL_METHOD structures at compile time. This removes the need
[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) 1999-2005 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 <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 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=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 if (s->s3->tmp.new_compression == NULL)
375 s->session->compress_meth=0;
376 else
377 s->session->compress_meth=
378 s->s3->tmp.new_compression->id;
379 if (!s->method->ssl3_enc->setup_key_block(s))
380 {
381 ret= -1;
382 goto end;
383 }
384
385 if (!s->method->ssl3_enc->change_cipher_state(s,
386 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
387 {
388 ret= -1;
389 goto end;
390 }
391
392 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
393 break;
394
395 case SSL3_ST_CW_FINISHED_A:
396 case SSL3_ST_CW_FINISHED_B:
397 ret=dtls1_send_finished(s,
398 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
399 s->method->ssl3_enc->client_finished_label,
400 s->method->ssl3_enc->client_finished_label_len);
401 if (ret <= 0) goto end;
402 s->state=SSL3_ST_CW_FLUSH;
403
404 /* clear flags */
405 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
406 if (s->hit)
407 {
408 s->s3->tmp.next_state=SSL_ST_OK;
409 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
410 {
411 s->state=SSL_ST_OK;
412 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
413 s->s3->delay_buf_pop_ret=0;
414 }
415 }
416 else
417 {
418 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
419 }
420 s->init_num=0;
421 break;
422
423 case SSL3_ST_CR_FINISHED_A:
424 case SSL3_ST_CR_FINISHED_B:
425
426 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
427 SSL3_ST_CR_FINISHED_B);
428 if (ret <= 0) goto end;
429
430 if (s->hit)
431 s->state=SSL3_ST_CW_CHANGE_A;
432 else
433 s->state=SSL_ST_OK;
434 s->init_num=0;
435 break;
436
437 case SSL3_ST_CW_FLUSH:
438 /* number of bytes to be flushed */
439 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
440 if (num1 > 0)
441 {
442 s->rwstate=SSL_WRITING;
443 num1=BIO_flush(s->wbio);
444 if (num1 <= 0) { ret= -1; goto end; }
445 s->rwstate=SSL_NOTHING;
446 }
447
448 s->state=s->s3->tmp.next_state;
449 break;
450
451 case SSL_ST_OK:
452 /* clean a few things up */
453 ssl3_cleanup_key_block(s);
454
455 #if 0
456 if (s->init_buf != NULL)
457 {
458 BUF_MEM_free(s->init_buf);
459 s->init_buf=NULL;
460 }
461 #endif
462
463 /* If we are not 'joining' the last two packets,
464 * remove the buffering now */
465 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
466 ssl_free_wbio_buffer(s);
467 /* else do it later in ssl3_write */
468
469 s->init_num=0;
470 s->new_session=0;
471
472 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
473 if (s->hit) s->ctx->stats.sess_hit++;
474
475 ret=1;
476 /* s->server=0; */
477 s->handshake_func=dtls1_connect;
478 s->ctx->stats.sess_connect_good++;
479
480 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
481
482 /* done with handshaking */
483 s->d1->handshake_read_seq = 0;
484 goto end;
485 /* break; */
486
487 default:
488 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
489 ret= -1;
490 goto end;
491 /* break; */
492 }
493
494 /* did we do anything */
495 if (!s->s3->tmp.reuse_message && !skip)
496 {
497 if (s->debug)
498 {
499 if ((ret=BIO_flush(s->wbio)) <= 0)
500 goto end;
501 }
502
503 if ((cb != NULL) && (s->state != state))
504 {
505 new_state=s->state;
506 s->state=state;
507 cb(s,SSL_CB_CONNECT_LOOP,1);
508 s->state=new_state;
509 }
510 }
511 skip=0;
512 }
513 end:
514 s->in_handshake--;
515 if (buf != NULL)
516 BUF_MEM_free(buf);
517 if (cb != NULL)
518 cb(s,SSL_CB_CONNECT_EXIT,ret);
519 return(ret);
520 }
521
522 int dtls1_client_hello(SSL *s)
523 {
524 unsigned char *buf;
525 unsigned char *p,*d;
526 unsigned int i,j;
527 unsigned long Time,l;
528 SSL_COMP *comp;
529
530 buf=(unsigned char *)s->init_buf->data;
531 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
532 {
533 if ((s->session == NULL) ||
534 (s->session->ssl_version != s->version) ||
535 (s->session->not_resumable))
536 {
537 if (!ssl_get_new_session(s,0))
538 goto err;
539 }
540 /* else use the pre-loaded session */
541
542 p=s->s3->client_random;
543 Time=time(NULL); /* Time */
544 l2n(Time,p);
545 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
546
547 /* Do the message type and length last */
548 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
549
550 *(p++)=s->version>>8;
551 *(p++)=s->version&0xff;
552 s->client_version=s->version;
553
554 /* Random stuff */
555 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
556 p+=SSL3_RANDOM_SIZE;
557
558 /* Session ID */
559 if (s->new_session)
560 i=0;
561 else
562 i=s->session->session_id_length;
563 *(p++)=i;
564 if (i != 0)
565 {
566 if (i > sizeof s->session->session_id)
567 {
568 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
569 goto err;
570 }
571 memcpy(p,s->session->session_id,i);
572 p+=i;
573 }
574
575 /* cookie stuff */
576 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
577 {
578 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
579 goto err;
580 }
581 *(p++) = s->d1->cookie_len;
582 memcpy(p, s->d1->cookie, s->d1->cookie_len);
583 p += s->d1->cookie_len;
584
585 /* Ciphers supported */
586 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
587 if (i == 0)
588 {
589 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
590 goto err;
591 }
592 s2n(i,p);
593 p+=i;
594
595 /* COMPRESSION */
596 if (s->ctx->comp_methods == NULL)
597 j=0;
598 else
599 j=sk_SSL_COMP_num(s->ctx->comp_methods);
600 *(p++)=1+j;
601 for (i=0; i<j; i++)
602 {
603 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
604 *(p++)=comp->id;
605 }
606 *(p++)=0; /* Add the NULL method */
607
608 l=(p-d);
609 d=buf;
610
611 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
612
613 s->state=SSL3_ST_CW_CLNT_HELLO_B;
614 /* number of bytes to write */
615 s->init_num=p-buf;
616 s->init_off=0;
617
618 /* buffer the message to handle re-xmits */
619 dtls1_buffer_message(s, 0);
620 }
621
622 /* SSL3_ST_CW_CLNT_HELLO_B */
623 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
624 err:
625 return(-1);
626 }
627
628 static int dtls1_get_hello_verify(SSL *s)
629 {
630 int n, al, ok = 0;
631 unsigned char *data;
632 unsigned int cookie_len;
633
634 n=s->method->ssl_get_message(s,
635 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
636 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
637 -1,
638 s->max_cert_list,
639 &ok);
640
641 if (!ok) return((int)n);
642
643 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
644 {
645 s->d1->send_cookie = 0;
646 s->s3->tmp.reuse_message=1;
647 return(1);
648 }
649
650 data = (unsigned char *)s->init_msg;
651
652 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
653 {
654 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
655 s->version=(s->version&0xff00)|data[1];
656 al = SSL_AD_PROTOCOL_VERSION;
657 goto f_err;
658 }
659 data+=2;
660
661 cookie_len = *(data++);
662 if ( cookie_len > sizeof(s->d1->cookie))
663 {
664 al=SSL_AD_ILLEGAL_PARAMETER;
665 goto f_err;
666 }
667
668 memcpy(s->d1->cookie, data, cookie_len);
669 s->d1->cookie_len = cookie_len;
670
671 s->d1->send_cookie = 1;
672 return 1;
673
674 f_err:
675 ssl3_send_alert(s, SSL3_AL_FATAL, al);
676 return -1;
677 }
678
679 int dtls1_send_client_key_exchange(SSL *s)
680 {
681 unsigned char *p,*d;
682 int n;
683 unsigned long l;
684 #ifndef OPENSSL_NO_RSA
685 unsigned char *q;
686 EVP_PKEY *pkey=NULL;
687 #endif
688 #ifndef OPENSSL_NO_KRB5
689 KSSL_ERR kssl_err;
690 #endif /* OPENSSL_NO_KRB5 */
691
692 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
693 {
694 d=(unsigned char *)s->init_buf->data;
695 p= &(d[DTLS1_HM_HEADER_LENGTH]);
696
697 l=s->s3->tmp.new_cipher->algorithms;
698
699 /* Fool emacs indentation */
700 if (0) {}
701 #ifndef OPENSSL_NO_RSA
702 else if (l & SSL_kRSA)
703 {
704 RSA *rsa;
705 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
706
707 if (s->session->sess_cert->peer_rsa_tmp != NULL)
708 rsa=s->session->sess_cert->peer_rsa_tmp;
709 else
710 {
711 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
712 if ((pkey == NULL) ||
713 (pkey->type != EVP_PKEY_RSA) ||
714 (pkey->pkey.rsa == NULL))
715 {
716 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
717 goto err;
718 }
719 rsa=pkey->pkey.rsa;
720 EVP_PKEY_free(pkey);
721 }
722
723 tmp_buf[0]=s->client_version>>8;
724 tmp_buf[1]=s->client_version&0xff;
725 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
726 goto err;
727
728 s->session->master_key_length=sizeof tmp_buf;
729
730 q=p;
731 /* Fix buf for TLS and beyond */
732 if (s->version > SSL3_VERSION)
733 p+=2;
734 n=RSA_public_encrypt(sizeof tmp_buf,
735 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
736 #ifdef PKCS1_CHECK
737 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
738 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
739 #endif
740 if (n <= 0)
741 {
742 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
743 goto err;
744 }
745
746 /* Fix buf for TLS and beyond */
747 if (s->version > SSL3_VERSION)
748 {
749 s2n(n,q);
750 n+=2;
751 }
752
753 s->session->master_key_length=
754 s->method->ssl3_enc->generate_master_secret(s,
755 s->session->master_key,
756 tmp_buf,sizeof tmp_buf);
757 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
758 }
759 #endif
760 #ifndef OPENSSL_NO_KRB5
761 else if (l & SSL_kKRB5)
762 {
763 krb5_error_code krb5rc;
764 KSSL_CTX *kssl_ctx = s->kssl_ctx;
765 /* krb5_data krb5_ap_req; */
766 krb5_data *enc_ticket;
767 krb5_data authenticator, *authp = NULL;
768 EVP_CIPHER_CTX ciph_ctx;
769 EVP_CIPHER *enc = NULL;
770 unsigned char iv[EVP_MAX_IV_LENGTH];
771 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
772 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
773 + EVP_MAX_IV_LENGTH];
774 int padl, outl = sizeof(epms);
775
776 EVP_CIPHER_CTX_init(&ciph_ctx);
777
778 #ifdef KSSL_DEBUG
779 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
780 l, SSL_kKRB5);
781 #endif /* KSSL_DEBUG */
782
783 authp = NULL;
784 #ifdef KRB5SENDAUTH
785 if (KRB5SENDAUTH) authp = &authenticator;
786 #endif /* KRB5SENDAUTH */
787
788 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
789 &kssl_err);
790 enc = kssl_map_enc(kssl_ctx->enctype);
791 if (enc == NULL)
792 goto err;
793 #ifdef KSSL_DEBUG
794 {
795 printf("kssl_cget_tkt rtn %d\n", krb5rc);
796 if (krb5rc && kssl_err.text)
797 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
798 }
799 #endif /* KSSL_DEBUG */
800
801 if (krb5rc)
802 {
803 ssl3_send_alert(s,SSL3_AL_FATAL,
804 SSL_AD_HANDSHAKE_FAILURE);
805 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
806 kssl_err.reason);
807 goto err;
808 }
809
810 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
811 ** in place of RFC 2712 KerberosWrapper, as in:
812 **
813 ** Send ticket (copy to *p, set n = length)
814 ** n = krb5_ap_req.length;
815 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
816 ** if (krb5_ap_req.data)
817 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
818 **
819 ** Now using real RFC 2712 KerberosWrapper
820 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
821 ** Note: 2712 "opaque" types are here replaced
822 ** with a 2-byte length followed by the value.
823 ** Example:
824 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
825 ** Where "xx xx" = length bytes. Shown here with
826 ** optional authenticator omitted.
827 */
828
829 /* KerberosWrapper.Ticket */
830 s2n(enc_ticket->length,p);
831 memcpy(p, enc_ticket->data, enc_ticket->length);
832 p+= enc_ticket->length;
833 n = enc_ticket->length + 2;
834
835 /* KerberosWrapper.Authenticator */
836 if (authp && authp->length)
837 {
838 s2n(authp->length,p);
839 memcpy(p, authp->data, authp->length);
840 p+= authp->length;
841 n+= authp->length + 2;
842
843 free(authp->data);
844 authp->data = NULL;
845 authp->length = 0;
846 }
847 else
848 {
849 s2n(0,p);/* null authenticator length */
850 n+=2;
851 }
852
853 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
854 goto err;
855
856 /* 20010420 VRS. Tried it this way; failed.
857 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
858 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
859 ** kssl_ctx->length);
860 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
861 */
862
863 memset(iv, 0, sizeof iv); /* per RFC 1510 */
864 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
865 kssl_ctx->key,iv);
866 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
867 sizeof tmp_buf);
868 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
869 outl += padl;
870 if (outl > sizeof epms)
871 {
872 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
873 goto err;
874 }
875 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
876
877 /* KerberosWrapper.EncryptedPreMasterSecret */
878 s2n(outl,p);
879 memcpy(p, epms, outl);
880 p+=outl;
881 n+=outl + 2;
882
883 s->session->master_key_length=
884 s->method->ssl3_enc->generate_master_secret(s,
885 s->session->master_key,
886 tmp_buf, sizeof tmp_buf);
887
888 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
889 OPENSSL_cleanse(epms, outl);
890 }
891 #endif
892 #ifndef OPENSSL_NO_DH
893 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
894 {
895 DH *dh_srvr,*dh_clnt;
896
897 if (s->session->sess_cert->peer_dh_tmp != NULL)
898 dh_srvr=s->session->sess_cert->peer_dh_tmp;
899 else
900 {
901 /* we get them from the cert */
902 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
903 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
904 goto err;
905 }
906
907 /* generate a new random key */
908 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
909 {
910 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
911 goto err;
912 }
913 if (!DH_generate_key(dh_clnt))
914 {
915 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
916 goto err;
917 }
918
919 /* use the 'p' output buffer for the DH key, but
920 * make sure to clear it out afterwards */
921
922 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
923
924 if (n <= 0)
925 {
926 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
927 goto err;
928 }
929
930 /* generate master key from the result */
931 s->session->master_key_length=
932 s->method->ssl3_enc->generate_master_secret(s,
933 s->session->master_key,p,n);
934 /* clean up */
935 memset(p,0,n);
936
937 /* send off the data */
938 n=BN_num_bytes(dh_clnt->pub_key);
939 s2n(n,p);
940 BN_bn2bin(dh_clnt->pub_key,p);
941 n+=2;
942
943 DH_free(dh_clnt);
944
945 /* perhaps clean things up a bit EAY EAY EAY EAY*/
946 }
947 #endif
948 else
949 {
950 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
951 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
952 goto err;
953 }
954
955 d = dtls1_set_message_header(s, d,
956 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
957 /*
958 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
959 l2n3(n,d);
960 l2n(s->d1->handshake_write_seq,d);
961 s->d1->handshake_write_seq++;
962 */
963
964 s->state=SSL3_ST_CW_KEY_EXCH_B;
965 /* number of bytes to write */
966 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
967 s->init_off=0;
968
969 /* buffer the message to handle re-xmits */
970 dtls1_buffer_message(s, 0);
971 }
972
973 /* SSL3_ST_CW_KEY_EXCH_B */
974 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
975 err:
976 return(-1);
977 }
978
979 int dtls1_send_client_verify(SSL *s)
980 {
981 unsigned char *p,*d;
982 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
983 EVP_PKEY *pkey;
984 #ifndef OPENSSL_NO_RSA
985 unsigned u=0;
986 #endif
987 unsigned long n;
988 #ifndef OPENSSL_NO_DSA
989 int j;
990 #endif
991
992 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
993 {
994 d=(unsigned char *)s->init_buf->data;
995 p= &(d[DTLS1_HM_HEADER_LENGTH]);
996 pkey=s->cert->key->privatekey;
997
998 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
999 &(data[MD5_DIGEST_LENGTH]));
1000
1001 #ifndef OPENSSL_NO_RSA
1002 if (pkey->type == EVP_PKEY_RSA)
1003 {
1004 s->method->ssl3_enc->cert_verify_mac(s,
1005 &(s->s3->finish_dgst1),&(data[0]));
1006 if (RSA_sign(NID_md5_sha1, data,
1007 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1008 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1009 {
1010 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1011 goto err;
1012 }
1013 s2n(u,p);
1014 n=u+2;
1015 }
1016 else
1017 #endif
1018 #ifndef OPENSSL_NO_DSA
1019 if (pkey->type == EVP_PKEY_DSA)
1020 {
1021 if (!DSA_sign(pkey->save_type,
1022 &(data[MD5_DIGEST_LENGTH]),
1023 SHA_DIGEST_LENGTH,&(p[2]),
1024 (unsigned int *)&j,pkey->pkey.dsa))
1025 {
1026 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1027 goto err;
1028 }
1029 s2n(j,p);
1030 n=j+2;
1031 }
1032 else
1033 #endif
1034 {
1035 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1036 goto err;
1037 }
1038
1039 d = dtls1_set_message_header(s, d,
1040 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1041
1042 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1043 s->init_off=0;
1044
1045 /* buffer the message to handle re-xmits */
1046 dtls1_buffer_message(s, 0);
1047
1048 s->state = SSL3_ST_CW_CERT_VRFY_B;
1049 }
1050
1051 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1052 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1053 err:
1054 return(-1);
1055 }
1056
1057 int dtls1_send_client_certificate(SSL *s)
1058 {
1059 X509 *x509=NULL;
1060 EVP_PKEY *pkey=NULL;
1061 int i;
1062 unsigned long l;
1063
1064 if (s->state == SSL3_ST_CW_CERT_A)
1065 {
1066 if ((s->cert == NULL) ||
1067 (s->cert->key->x509 == NULL) ||
1068 (s->cert->key->privatekey == NULL))
1069 s->state=SSL3_ST_CW_CERT_B;
1070 else
1071 s->state=SSL3_ST_CW_CERT_C;
1072 }
1073
1074 /* We need to get a client cert */
1075 if (s->state == SSL3_ST_CW_CERT_B)
1076 {
1077 /* If we get an error, we need to
1078 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1079 * We then get retied later */
1080 i=0;
1081 if (s->ctx->client_cert_cb != NULL)
1082 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1083 if (i < 0)
1084 {
1085 s->rwstate=SSL_X509_LOOKUP;
1086 return(-1);
1087 }
1088 s->rwstate=SSL_NOTHING;
1089 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1090 {
1091 s->state=SSL3_ST_CW_CERT_B;
1092 if ( !SSL_use_certificate(s,x509) ||
1093 !SSL_use_PrivateKey(s,pkey))
1094 i=0;
1095 }
1096 else if (i == 1)
1097 {
1098 i=0;
1099 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1100 }
1101
1102 if (x509 != NULL) X509_free(x509);
1103 if (pkey != NULL) EVP_PKEY_free(pkey);
1104 if (i == 0)
1105 {
1106 if (s->version == SSL3_VERSION)
1107 {
1108 s->s3->tmp.cert_req=0;
1109 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1110 return(1);
1111 }
1112 else
1113 {
1114 s->s3->tmp.cert_req=2;
1115 }
1116 }
1117
1118 /* Ok, we have a cert */
1119 s->state=SSL3_ST_CW_CERT_C;
1120 }
1121
1122 if (s->state == SSL3_ST_CW_CERT_C)
1123 {
1124 s->state=SSL3_ST_CW_CERT_D;
1125 l=dtls1_output_cert_chain(s,
1126 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1127 s->init_num=(int)l;
1128 s->init_off=0;
1129
1130 /* set header called by dtls1_output_cert_chain() */
1131
1132 /* buffer the message to handle re-xmits */
1133 dtls1_buffer_message(s, 0);
1134 }
1135 /* SSL3_ST_CW_CERT_D */
1136 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1137 }
1138
1139
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