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1/* ssl/d1_srvr.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/x509.h>
123#include <openssl/md5.h>
124#ifndef OPENSSL_NO_DH
125#include <openssl/dh.h>
126#endif
127
128static SSL_METHOD *dtls1_get_server_method(int ver);
129static int dtls1_send_hello_verify_request(SSL *s);
130
131static SSL_METHOD *dtls1_get_server_method(int ver)
132 {
133 if (ver == DTLS1_VERSION)
134 return(DTLSv1_server_method());
135 else
136 return(NULL);
137 }
138
139IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
140 dtls1_accept,
141 ssl_undefined_function,
142 dtls1_get_server_method)
143
144int dtls1_accept(SSL *s)
145 {
146 BUF_MEM *buf;
147 unsigned long l,Time=(unsigned long)time(NULL);
148 void (*cb)(const SSL *ssl,int type,int val)=NULL;
149 long num1;
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 /* init things to blank */
163 s->in_handshake++;
164 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
165
166 if (s->cert == NULL)
167 {
168 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
169 return(-1);
170 }
171
172 for (;;)
173 {
174 state=s->state;
175
176 switch (s->state)
177 {
178 case SSL_ST_RENEGOTIATE:
179 s->new_session=1;
180 /* s->state=SSL_ST_ACCEPT; */
181
182 case SSL_ST_BEFORE:
183 case SSL_ST_ACCEPT:
184 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
185 case SSL_ST_OK|SSL_ST_ACCEPT:
186
187 s->server=1;
188 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
189
190 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
191 {
192 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
193 return -1;
194 }
195 s->type=SSL_ST_ACCEPT;
196
197 if (s->init_buf == NULL)
198 {
199 if ((buf=BUF_MEM_new()) == NULL)
200 {
201 ret= -1;
202 goto end;
203 }
204 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
205 {
206 ret= -1;
207 goto end;
208 }
209 s->init_buf=buf;
210 }
211
212 if (!ssl3_setup_buffers(s))
213 {
214 ret= -1;
215 goto end;
216 }
217
218 s->init_num=0;
219
220 if (s->state != SSL_ST_RENEGOTIATE)
221 {
222 /* Ok, we now need to push on a buffering BIO so that
223 * the output is sent in a way that TCP likes :-)
224 */
225 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
226
227 ssl3_init_finished_mac(s);
228 s->state=SSL3_ST_SR_CLNT_HELLO_A;
229 s->ctx->stats.sess_accept++;
230 }
231 else
232 {
233 /* s->state == SSL_ST_RENEGOTIATE,
234 * we will just send a HelloRequest */
235 s->ctx->stats.sess_accept_renegotiate++;
236 s->state=SSL3_ST_SW_HELLO_REQ_A;
237 }
238
239 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
240 s->d1->send_cookie = 1;
241 else
242 s->d1->send_cookie = 0;
243
244 break;
245
246 case SSL3_ST_SW_HELLO_REQ_A:
247 case SSL3_ST_SW_HELLO_REQ_B:
248
249 s->shutdown=0;
250 ret=dtls1_send_hello_request(s);
251 if (ret <= 0) goto end;
252 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
253 s->state=SSL3_ST_SW_FLUSH;
254 s->init_num=0;
255
256 ssl3_init_finished_mac(s);
257 break;
258
259 case SSL3_ST_SW_HELLO_REQ_C:
260 s->state=SSL_ST_OK;
261 break;
262
263 case SSL3_ST_SR_CLNT_HELLO_A:
264 case SSL3_ST_SR_CLNT_HELLO_B:
265 case SSL3_ST_SR_CLNT_HELLO_C:
266
267 s->shutdown=0;
268 ret=ssl3_get_client_hello(s);
269 if (ret <= 0) goto end;
270 s->new_session = 2;
271
272 if ( s->d1->send_cookie)
273 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
274 else
275 s->state = SSL3_ST_SW_SRVR_HELLO_A;
276
277 s->init_num=0;
278 break;
279
280 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
281 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
282
283 ret = dtls1_send_hello_verify_request(s);
284 if ( ret <= 0) goto end;
285 s->d1->send_cookie = 0;
286 s->state=SSL3_ST_SW_FLUSH;
287 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
288
289 /* HelloVerifyRequests resets Finished MAC */
290 if (s->client_version != DTLS1_BAD_VER)
291 ssl3_init_finished_mac(s);
292 break;
293
294 case SSL3_ST_SW_SRVR_HELLO_A:
295 case SSL3_ST_SW_SRVR_HELLO_B:
296 ret=dtls1_send_server_hello(s);
297 if (ret <= 0) goto end;
298
299 if (s->hit)
300 s->state=SSL3_ST_SW_CHANGE_A;
301 else
302 s->state=SSL3_ST_SW_CERT_A;
303 s->init_num=0;
304 break;
305
306 case SSL3_ST_SW_CERT_A:
307 case SSL3_ST_SW_CERT_B:
308 /* Check if it is anon DH */
309 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
310 {
311 ret=dtls1_send_server_certificate(s);
312 if (ret <= 0) goto end;
313 }
314 else
315 skip=1;
316 s->state=SSL3_ST_SW_KEY_EXCH_A;
317 s->init_num=0;
318 break;
319
320 case SSL3_ST_SW_KEY_EXCH_A:
321 case SSL3_ST_SW_KEY_EXCH_B:
322 l=s->s3->tmp.new_cipher->algorithms;
323
324 /* clear this, it may get reset by
325 * send_server_key_exchange */
326 if ((s->options & SSL_OP_EPHEMERAL_RSA)
327#ifndef OPENSSL_NO_KRB5
328 && !(l & SSL_KRB5)
329#endif /* OPENSSL_NO_KRB5 */
330 )
331 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
332 * even when forbidden by protocol specs
333 * (handshake may fail as clients are not required to
334 * be able to handle this) */
335 s->s3->tmp.use_rsa_tmp=1;
336 else
337 s->s3->tmp.use_rsa_tmp=0;
338
339 /* only send if a DH key exchange, fortezza or
340 * RSA but we have a sign only certificate */
341 if (s->s3->tmp.use_rsa_tmp
342 || (l & (SSL_DH|SSL_kFZA))
343 || ((l & SSL_kRSA)
344 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
345 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
346 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
347 )
348 )
349 )
350 )
351 {
352 ret=dtls1_send_server_key_exchange(s);
353 if (ret <= 0) goto end;
354 }
355 else
356 skip=1;
357
358 s->state=SSL3_ST_SW_CERT_REQ_A;
359 s->init_num=0;
360 break;
361
362 case SSL3_ST_SW_CERT_REQ_A:
363 case SSL3_ST_SW_CERT_REQ_B:
364 if (/* don't request cert unless asked for it: */
365 !(s->verify_mode & SSL_VERIFY_PEER) ||
366 /* if SSL_VERIFY_CLIENT_ONCE is set,
367 * don't request cert during re-negotiation: */
368 ((s->session->peer != NULL) &&
369 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
370 /* never request cert in anonymous ciphersuites
371 * (see section "Certificate request" in SSL 3 drafts
372 * and in RFC 2246): */
373 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
374 /* ... except when the application insists on verification
375 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
376 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
377 /* never request cert in Kerberos ciphersuites */
378 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
379 {
380 /* no cert request */
381 skip=1;
382 s->s3->tmp.cert_request=0;
383 s->state=SSL3_ST_SW_SRVR_DONE_A;
384 }
385 else
386 {
387 s->s3->tmp.cert_request=1;
388 ret=dtls1_send_certificate_request(s);
389 if (ret <= 0) goto end;
390#ifndef NETSCAPE_HANG_BUG
391 s->state=SSL3_ST_SW_SRVR_DONE_A;
392#else
393 s->state=SSL3_ST_SW_FLUSH;
394 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
395#endif
396 s->init_num=0;
397 }
398 break;
399
400 case SSL3_ST_SW_SRVR_DONE_A:
401 case SSL3_ST_SW_SRVR_DONE_B:
402 ret=dtls1_send_server_done(s);
403 if (ret <= 0) goto end;
404 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
405 s->state=SSL3_ST_SW_FLUSH;
406 s->init_num=0;
407 break;
408
409 case SSL3_ST_SW_FLUSH:
410 /* number of bytes to be flushed */
411 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
412 if (num1 > 0)
413 {
414 s->rwstate=SSL_WRITING;
415 num1=BIO_flush(s->wbio);
416 if (num1 <= 0) { ret= -1; goto end; }
417 s->rwstate=SSL_NOTHING;
418 }
419
420 s->state=s->s3->tmp.next_state;
421 break;
422
423 case SSL3_ST_SR_CERT_A:
424 case SSL3_ST_SR_CERT_B:
425 /* Check for second client hello (MS SGC) */
426 ret = ssl3_check_client_hello(s);
427 if (ret <= 0)
428 goto end;
429 if (ret == 2)
430 s->state = SSL3_ST_SR_CLNT_HELLO_C;
431 else {
432 /* could be sent for a DH cert, even if we
433 * have not asked for it :-) */
434 ret=ssl3_get_client_certificate(s);
435 if (ret <= 0) goto end;
436 s->init_num=0;
437 s->state=SSL3_ST_SR_KEY_EXCH_A;
438 }
439 break;
440
441 case SSL3_ST_SR_KEY_EXCH_A:
442 case SSL3_ST_SR_KEY_EXCH_B:
443 ret=ssl3_get_client_key_exchange(s);
444 if (ret <= 0) goto end;
445 s->state=SSL3_ST_SR_CERT_VRFY_A;
446 s->init_num=0;
447
448 /* We need to get hashes here so if there is
449 * a client cert, it can be verified */
450 s->method->ssl3_enc->cert_verify_mac(s,
451 &(s->s3->finish_dgst1),
452 &(s->s3->tmp.cert_verify_md[0]));
453 s->method->ssl3_enc->cert_verify_mac(s,
454 &(s->s3->finish_dgst2),
455 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
456
457 break;
458
459 case SSL3_ST_SR_CERT_VRFY_A:
460 case SSL3_ST_SR_CERT_VRFY_B:
461
462 /* we should decide if we expected this one */
463 ret=ssl3_get_cert_verify(s);
464 if (ret <= 0) goto end;
465
466 s->state=SSL3_ST_SR_FINISHED_A;
467 s->init_num=0;
468 break;
469
470 case SSL3_ST_SR_FINISHED_A:
471 case SSL3_ST_SR_FINISHED_B:
472 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
473 SSL3_ST_SR_FINISHED_B);
474 if (ret <= 0) goto end;
475 if (s->hit)
476 s->state=SSL_ST_OK;
477 else
478 s->state=SSL3_ST_SW_CHANGE_A;
479 s->init_num=0;
480 break;
481
482 case SSL3_ST_SW_CHANGE_A:
483 case SSL3_ST_SW_CHANGE_B:
484
485 s->session->cipher=s->s3->tmp.new_cipher;
486 if (!s->method->ssl3_enc->setup_key_block(s))
487 { ret= -1; goto end; }
488
489 ret=dtls1_send_change_cipher_spec(s,
490 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
491
492 if (ret <= 0) goto end;
493 s->state=SSL3_ST_SW_FINISHED_A;
494 s->init_num=0;
495
496 if (!s->method->ssl3_enc->change_cipher_state(s,
497 SSL3_CHANGE_CIPHER_SERVER_WRITE))
498 {
499 ret= -1;
500 goto end;
501 }
502
503 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
504 break;
505
506 case SSL3_ST_SW_FINISHED_A:
507 case SSL3_ST_SW_FINISHED_B:
508 ret=dtls1_send_finished(s,
509 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
510 s->method->ssl3_enc->server_finished_label,
511 s->method->ssl3_enc->server_finished_label_len);
512 if (ret <= 0) goto end;
513 s->state=SSL3_ST_SW_FLUSH;
514 if (s->hit)
515 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
516 else
517 s->s3->tmp.next_state=SSL_ST_OK;
518 s->init_num=0;
519 break;
520
521 case SSL_ST_OK:
522 /* clean a few things up */
523 ssl3_cleanup_key_block(s);
524
525#if 0
526 BUF_MEM_free(s->init_buf);
527 s->init_buf=NULL;
528#endif
529
530 /* remove buffering on output */
531 ssl_free_wbio_buffer(s);
532
533 s->init_num=0;
534
535 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
536 {
537 /* actually not necessarily a 'new' session unless
538 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
539
540 s->new_session=0;
541
542 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
543
544 s->ctx->stats.sess_accept_good++;
545 /* s->server=1; */
546 s->handshake_func=dtls1_accept;
547
548 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
549 }
550
551 ret = 1;
552
553 /* done handshaking, next message is client hello */
554 s->d1->handshake_read_seq = 0;
555 /* next message is server hello */
556 s->d1->handshake_write_seq = 0;
557 goto end;
558 /* break; */
559
560 default:
561 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
562 ret= -1;
563 goto end;
564 /* break; */
565 }
566
567 if (!s->s3->tmp.reuse_message && !skip)
568 {
569 if (s->debug)
570 {
571 if ((ret=BIO_flush(s->wbio)) <= 0)
572 goto end;
573 }
574
575
576 if ((cb != NULL) && (s->state != state))
577 {
578 new_state=s->state;
579 s->state=state;
580 cb(s,SSL_CB_ACCEPT_LOOP,1);
581 s->state=new_state;
582 }
583 }
584 skip=0;
585 }
586end:
587 /* BIO_flush(s->wbio); */
588
589 s->in_handshake--;
590 if (cb != NULL)
591 cb(s,SSL_CB_ACCEPT_EXIT,ret);
592 return(ret);
593 }
594
595int dtls1_send_hello_request(SSL *s)
596 {
597 unsigned char *p;
598
599 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
600 {
601 p=(unsigned char *)s->init_buf->data;
602 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
603
604 s->state=SSL3_ST_SW_HELLO_REQ_B;
605 /* number of bytes to write */
606 s->init_num=DTLS1_HM_HEADER_LENGTH;
607 s->init_off=0;
608
609 /* no need to buffer this message, since there are no retransmit
610 * requests for it */
611 }
612
613 /* SSL3_ST_SW_HELLO_REQ_B */
614 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
615 }
616
617int dtls1_send_hello_verify_request(SSL *s)
618 {
619 unsigned int msg_len;
620 unsigned char *msg, *buf, *p;
621
622 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
623 {
624 buf = (unsigned char *)s->init_buf->data;
625
626 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
627 if (s->client_version == DTLS1_BAD_VER)
628 *(p++) = DTLS1_BAD_VER>>8,
629 *(p++) = DTLS1_BAD_VER&0xff;
630 else
631 *(p++) = s->version >> 8,
632 *(p++) = s->version & 0xFF;
633
634 if (s->ctx->app_gen_cookie_cb != NULL &&
635 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
636 &(s->d1->cookie_len)) == 0)
637 {
638 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
639 return 0;
640 }
641 /* else the cookie is assumed to have
642 * been initialized by the application */
643
644 *(p++) = (unsigned char) s->d1->cookie_len;
645 memcpy(p, s->d1->cookie, s->d1->cookie_len);
646 p += s->d1->cookie_len;
647 msg_len = p - msg;
648
649 dtls1_set_message_header(s, buf,
650 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
651
652 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
653 /* number of bytes to write */
654 s->init_num=p-buf;
655 s->init_off=0;
656
657 /* buffer the message to handle re-xmits */
658 dtls1_buffer_message(s, 0);
659 }
660
661 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
662 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
663 }
664
665int dtls1_send_server_hello(SSL *s)
666 {
667 unsigned char *buf;
668 unsigned char *p,*d;
669 int i;
670 unsigned int sl;
671 unsigned long l,Time;
672
673 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
674 {
675 buf=(unsigned char *)s->init_buf->data;
676 p=s->s3->server_random;
677 Time=(unsigned long)time(NULL); /* Time */
678 l2n(Time,p);
679 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
680 /* Do the message type and length last */
681 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
682
683 if (s->client_version == DTLS1_BAD_VER)
684 *(p++)=DTLS1_BAD_VER>>8,
685 *(p++)=DTLS1_BAD_VER&0xff;
686 else
687 *(p++)=s->version>>8,
688 *(p++)=s->version&0xff;
689
690 /* Random stuff */
691 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
692 p+=SSL3_RANDOM_SIZE;
693
694 /* now in theory we have 3 options to sending back the
695 * session id. If it is a re-use, we send back the
696 * old session-id, if it is a new session, we send
697 * back the new session-id or we send back a 0 length
698 * session-id if we want it to be single use.
699 * Currently I will not implement the '0' length session-id
700 * 12-Jan-98 - I'll now support the '0' length stuff.
701 */
702 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
703 s->session->session_id_length=0;
704
705 sl=s->session->session_id_length;
706 if (sl > sizeof s->session->session_id)
707 {
708 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
709 return -1;
710 }
711 *(p++)=sl;
712 memcpy(p,s->session->session_id,sl);
713 p+=sl;
714
715 /* put the cipher */
716 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
717 p+=i;
718
719 /* put the compression method */
720#ifdef OPENSSL_NO_COMP
721 *(p++)=0;
722#else
723 if (s->s3->tmp.new_compression == NULL)
724 *(p++)=0;
725 else
726 *(p++)=s->s3->tmp.new_compression->id;
727#endif
728
729 /* do the header */
730 l=(p-d);
731 d=buf;
732
733 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
734
735 s->state=SSL3_ST_CW_CLNT_HELLO_B;
736 /* number of bytes to write */
737 s->init_num=p-buf;
738 s->init_off=0;
739
740 /* buffer the message to handle re-xmits */
741 dtls1_buffer_message(s, 0);
742 }
743
744 /* SSL3_ST_CW_CLNT_HELLO_B */
745 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
746 }
747
748int dtls1_send_server_done(SSL *s)
749 {
750 unsigned char *p;
751
752 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
753 {
754 p=(unsigned char *)s->init_buf->data;
755
756 /* do the header */
757 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
758
759 s->state=SSL3_ST_SW_SRVR_DONE_B;
760 /* number of bytes to write */
761 s->init_num=DTLS1_HM_HEADER_LENGTH;
762 s->init_off=0;
763
764 /* buffer the message to handle re-xmits */
765 dtls1_buffer_message(s, 0);
766 }
767
768 /* SSL3_ST_CW_CLNT_HELLO_B */
769 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
770 }
771
772int dtls1_send_server_key_exchange(SSL *s)
773 {
774#ifndef OPENSSL_NO_RSA
775 unsigned char *q;
776 int j,num;
777 RSA *rsa;
778 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
779 unsigned int u;
780#endif
781#ifndef OPENSSL_NO_DH
782 DH *dh=NULL,*dhp;
783#endif
784 EVP_PKEY *pkey;
785 unsigned char *p,*d;
786 int al,i;
787 unsigned long type;
788 int n;
789 CERT *cert;
790 BIGNUM *r[4];
791 int nr[4],kn;
792 BUF_MEM *buf;
793 EVP_MD_CTX md_ctx;
794
795 EVP_MD_CTX_init(&md_ctx);
796 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
797 {
798 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
799 cert=s->cert;
800
801 buf=s->init_buf;
802
803 r[0]=r[1]=r[2]=r[3]=NULL;
804 n=0;
805#ifndef OPENSSL_NO_RSA
806 if (type & SSL_kRSA)
807 {
808 rsa=cert->rsa_tmp;
809 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
810 {
811 rsa=s->cert->rsa_tmp_cb(s,
812 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
813 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
814 if(rsa == NULL)
815 {
816 al=SSL_AD_HANDSHAKE_FAILURE;
817 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
818 goto f_err;
819 }
820 RSA_up_ref(rsa);
821 cert->rsa_tmp=rsa;
822 }
823 if (rsa == NULL)
824 {
825 al=SSL_AD_HANDSHAKE_FAILURE;
826 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
827 goto f_err;
828 }
829 r[0]=rsa->n;
830 r[1]=rsa->e;
831 s->s3->tmp.use_rsa_tmp=1;
832 }
833 else
834#endif
835#ifndef OPENSSL_NO_DH
836 if (type & SSL_kEDH)
837 {
838 dhp=cert->dh_tmp;
839 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
840 dhp=s->cert->dh_tmp_cb(s,
841 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
842 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
843 if (dhp == NULL)
844 {
845 al=SSL_AD_HANDSHAKE_FAILURE;
846 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
847 goto f_err;
848 }
849
850 if (s->s3->tmp.dh != NULL)
851 {
852 DH_free(dh);
853 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
854 goto err;
855 }
856
857 if ((dh=DHparams_dup(dhp)) == NULL)
858 {
859 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
860 goto err;
861 }
862
863 s->s3->tmp.dh=dh;
864 if ((dhp->pub_key == NULL ||
865 dhp->priv_key == NULL ||
866 (s->options & SSL_OP_SINGLE_DH_USE)))
867 {
868 if(!DH_generate_key(dh))
869 {
870 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
871 ERR_R_DH_LIB);
872 goto err;
873 }
874 }
875 else
876 {
877 dh->pub_key=BN_dup(dhp->pub_key);
878 dh->priv_key=BN_dup(dhp->priv_key);
879 if ((dh->pub_key == NULL) ||
880 (dh->priv_key == NULL))
881 {
882 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
883 goto err;
884 }
885 }
886 r[0]=dh->p;
887 r[1]=dh->g;
888 r[2]=dh->pub_key;
889 }
890 else
891#endif
892 {
893 al=SSL_AD_HANDSHAKE_FAILURE;
894 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
895 goto f_err;
896 }
897 for (i=0; r[i] != NULL; i++)
898 {
899 nr[i]=BN_num_bytes(r[i]);
900 n+=2+nr[i];
901 }
902
903 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
904 {
905 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
906 == NULL)
907 {
908 al=SSL_AD_DECODE_ERROR;
909 goto f_err;
910 }
911 kn=EVP_PKEY_size(pkey);
912 }
913 else
914 {
915 pkey=NULL;
916 kn=0;
917 }
918
919 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
920 {
921 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
922 goto err;
923 }
924 d=(unsigned char *)s->init_buf->data;
925 p= &(d[DTLS1_HM_HEADER_LENGTH]);
926
927 for (i=0; r[i] != NULL; i++)
928 {
929 s2n(nr[i],p);
930 BN_bn2bin(r[i],p);
931 p+=nr[i];
932 }
933
934 /* not anonymous */
935 if (pkey != NULL)
936 {
937 /* n is the length of the params, they start at
938 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
939 * at the end. */
940#ifndef OPENSSL_NO_RSA
941 if (pkey->type == EVP_PKEY_RSA)
942 {
943 q=md_buf;
944 j=0;
945 for (num=2; num > 0; num--)
946 {
947 EVP_DigestInit_ex(&md_ctx,(num == 2)
948 ?s->ctx->md5:s->ctx->sha1, NULL);
949 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
950 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
951 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
952 EVP_DigestFinal_ex(&md_ctx,q,
953 (unsigned int *)&i);
954 q+=i;
955 j+=i;
956 }
957 if (RSA_sign(NID_md5_sha1, md_buf, j,
958 &(p[2]), &u, pkey->pkey.rsa) <= 0)
959 {
960 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
961 goto err;
962 }
963 s2n(u,p);
964 n+=u+2;
965 }
966 else
967#endif
968#if !defined(OPENSSL_NO_DSA)
969 if (pkey->type == EVP_PKEY_DSA)
970 {
971 /* lets do DSS */
972 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
973 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
974 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
975 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
976 if (!EVP_SignFinal(&md_ctx,&(p[2]),
977 (unsigned int *)&i,pkey))
978 {
979 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
980 goto err;
981 }
982 s2n(i,p);
983 n+=i+2;
984 }
985 else
986#endif
987 {
988 /* Is this error check actually needed? */
989 al=SSL_AD_HANDSHAKE_FAILURE;
990 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
991 goto f_err;
992 }
993 }
994
995 d = dtls1_set_message_header(s, d,
996 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
997
998 /* we should now have things packed up, so lets send
999 * it off */
1000 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1001 s->init_off=0;
1002
1003 /* buffer the message to handle re-xmits */
1004 dtls1_buffer_message(s, 0);
1005 }
1006
1007 s->state = SSL3_ST_SW_KEY_EXCH_B;
1008 EVP_MD_CTX_cleanup(&md_ctx);
1009 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1010f_err:
1011 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1012err:
1013 EVP_MD_CTX_cleanup(&md_ctx);
1014 return(-1);
1015 }
1016
1017int dtls1_send_certificate_request(SSL *s)
1018 {
1019 unsigned char *p,*d;
1020 int i,j,nl,off,n;
1021 STACK_OF(X509_NAME) *sk=NULL;
1022 X509_NAME *name;
1023 BUF_MEM *buf;
1024 unsigned int msg_len;
1025
1026 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1027 {
1028 buf=s->init_buf;
1029
1030 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1031
1032 /* get the list of acceptable cert types */
1033 p++;
1034 n=ssl3_get_req_cert_type(s,p);
1035 d[0]=n;
1036 p+=n;
1037 n++;
1038
1039 off=n;
1040 p+=2;
1041 n+=2;
1042
1043 sk=SSL_get_client_CA_list(s);
1044 nl=0;
1045 if (sk != NULL)
1046 {
1047 for (i=0; i<sk_X509_NAME_num(sk); i++)
1048 {
1049 name=sk_X509_NAME_value(sk,i);
1050 j=i2d_X509_NAME(name,NULL);
1051 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1052 {
1053 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1054 goto err;
1055 }
1056 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1057 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1058 {
1059 s2n(j,p);
1060 i2d_X509_NAME(name,&p);
1061 n+=2+j;
1062 nl+=2+j;
1063 }
1064 else
1065 {
1066 d=p;
1067 i2d_X509_NAME(name,&p);
1068 j-=2; s2n(j,d); j+=2;
1069 n+=j;
1070 nl+=j;
1071 }
1072 }
1073 }
1074 /* else no CA names */
1075 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1076 s2n(nl,p);
1077
1078 d=(unsigned char *)buf->data;
1079 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1080 l2n3(n,d);
1081 s2n(s->d1->handshake_write_seq,d);
1082 s->d1->handshake_write_seq++;
1083
1084 /* we should now have things packed up, so lets send
1085 * it off */
1086
1087 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1088 s->init_off=0;
1089#ifdef NETSCAPE_HANG_BUG
1090/* XXX: what to do about this? */
1091 p=(unsigned char *)s->init_buf->data + s->init_num;
1092
1093 /* do the header */
1094 *(p++)=SSL3_MT_SERVER_DONE;
1095 *(p++)=0;
1096 *(p++)=0;
1097 *(p++)=0;
1098 s->init_num += 4;
1099#endif
1100
1101 /* XDTLS: set message header ? */
1102 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1103 dtls1_set_message_header(s, (void *)s->init_buf->data,
1104 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1105
1106 /* buffer the message to handle re-xmits */
1107 dtls1_buffer_message(s, 0);
1108
1109 s->state = SSL3_ST_SW_CERT_REQ_B;
1110 }
1111
1112 /* SSL3_ST_SW_CERT_REQ_B */
1113 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1114err:
1115 return(-1);
1116 }
1117
1118int dtls1_send_server_certificate(SSL *s)
1119 {
1120 unsigned long l;
1121 X509 *x;
1122
1123 if (s->state == SSL3_ST_SW_CERT_A)
1124 {
1125 x=ssl_get_server_send_cert(s);
1126 if (x == NULL &&
1127 /* VRS: allow null cert if auth == KRB5 */
1128 (s->s3->tmp.new_cipher->algorithms
1129 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1130 != (SSL_aKRB5|SSL_kKRB5))
1131 {
1132 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1133 return(0);
1134 }
1135
1136 l=dtls1_output_cert_chain(s,x);
1137 s->state=SSL3_ST_SW_CERT_B;
1138 s->init_num=(int)l;
1139 s->init_off=0;
1140
1141 /* buffer the message to handle re-xmits */
1142 dtls1_buffer_message(s, 0);
1143 }
1144
1145 /* SSL3_ST_SW_CERT_B */
1146 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1147 }
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