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Updates from 1.0.0-stable.
[thirdparty/openssl.git] / ssl / d1_srvr.c
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) 1999-2007 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
61 *
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
65 *
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
72 *
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97 *
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108 * SUCH DAMAGE.
109 *
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
114 */
115
116 #include <stdio.h>
117 #include "ssl_locl.h"
118 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
120 #include <openssl/objects.h>
121 #include <openssl/evp.h>
122 #include <openssl/x509.h>
123 #include <openssl/md5.h>
124 #include <openssl/bn.h>
125 #ifndef OPENSSL_NO_DH
126 #include <openssl/dh.h>
127 #endif
128
129 static const SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
131
132 static const SSL_METHOD *dtls1_get_server_method(int ver)
133 {
134 if (ver == DTLS1_VERSION)
135 return(DTLSv1_server_method());
136 else
137 return(NULL);
138 }
139
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
141 dtls1_accept,
142 ssl_undefined_function,
143 dtls1_get_server_method)
144
145 int dtls1_accept(SSL *s)
146 {
147 BUF_MEM *buf;
148 unsigned long Time=(unsigned long)time(NULL);
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
150 long num1;
151 unsigned long alg_k;
152 int ret= -1;
153 int new_state,state,skip=0;
154
155 RAND_add(&Time,sizeof(Time),0);
156 ERR_clear_error();
157 clear_sys_error();
158
159 if (s->info_callback != NULL)
160 cb=s->info_callback;
161 else if (s->ctx->info_callback != NULL)
162 cb=s->ctx->info_callback;
163
164 /* init things to blank */
165 s->in_handshake++;
166 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
167
168 if (s->cert == NULL)
169 {
170 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
171 return(-1);
172 }
173
174 for (;;)
175 {
176 state=s->state;
177
178 switch (s->state)
179 {
180 case SSL_ST_RENEGOTIATE:
181 s->new_session=1;
182 /* s->state=SSL_ST_ACCEPT; */
183
184 case SSL_ST_BEFORE:
185 case SSL_ST_ACCEPT:
186 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
187 case SSL_ST_OK|SSL_ST_ACCEPT:
188
189 s->server=1;
190 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
191
192 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
193 {
194 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
195 return -1;
196 }
197 s->type=SSL_ST_ACCEPT;
198
199 if (s->init_buf == NULL)
200 {
201 if ((buf=BUF_MEM_new()) == NULL)
202 {
203 ret= -1;
204 goto end;
205 }
206 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
207 {
208 ret= -1;
209 goto end;
210 }
211 s->init_buf=buf;
212 }
213
214 if (!ssl3_setup_buffers(s))
215 {
216 ret= -1;
217 goto end;
218 }
219
220 s->init_num=0;
221
222 if (s->state != SSL_ST_RENEGOTIATE)
223 {
224 /* Ok, we now need to push on a buffering BIO so that
225 * the output is sent in a way that TCP likes :-)
226 */
227 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
228
229 ssl3_init_finished_mac(s);
230 s->state=SSL3_ST_SR_CLNT_HELLO_A;
231 s->ctx->stats.sess_accept++;
232 }
233 else
234 {
235 /* s->state == SSL_ST_RENEGOTIATE,
236 * we will just send a HelloRequest */
237 s->ctx->stats.sess_accept_renegotiate++;
238 s->state=SSL3_ST_SW_HELLO_REQ_A;
239 }
240
241 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
242 s->d1->send_cookie = 1;
243 else
244 s->d1->send_cookie = 0;
245
246 break;
247
248 case SSL3_ST_SW_HELLO_REQ_A:
249 case SSL3_ST_SW_HELLO_REQ_B:
250
251 s->shutdown=0;
252 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
253 ret=dtls1_send_hello_request(s);
254 if (ret <= 0) goto end;
255 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
256 s->state=SSL3_ST_SW_FLUSH;
257 s->init_num=0;
258
259 ssl3_init_finished_mac(s);
260 break;
261
262 case SSL3_ST_SW_HELLO_REQ_C:
263 s->state=SSL_ST_OK;
264 break;
265
266 case SSL3_ST_SR_CLNT_HELLO_A:
267 case SSL3_ST_SR_CLNT_HELLO_B:
268 case SSL3_ST_SR_CLNT_HELLO_C:
269
270 s->shutdown=0;
271 ret=ssl3_get_client_hello(s);
272 if (ret <= 0) goto end;
273 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
274 s->new_session = 2;
275
276 if (s->d1->send_cookie)
277 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
278 else
279 s->state = SSL3_ST_SW_SRVR_HELLO_A;
280
281 s->init_num=0;
282 break;
283
284 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
285 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
286
287 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
288 ret = dtls1_send_hello_verify_request(s);
289 if ( ret <= 0) goto end;
290 s->d1->send_cookie = 0;
291 s->state=SSL3_ST_SW_FLUSH;
292 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
293
294 /* HelloVerifyRequest resets Finished MAC */
295 ssl3_init_finished_mac(s);
296 break;
297
298 case SSL3_ST_SW_SRVR_HELLO_A:
299 case SSL3_ST_SW_SRVR_HELLO_B:
300 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
301 ret=dtls1_send_server_hello(s);
302 if (ret <= 0) goto end;
303
304 if (s->hit)
305 s->state=SSL3_ST_SW_CHANGE_A;
306 else
307 s->state=SSL3_ST_SW_CERT_A;
308 s->init_num=0;
309 break;
310
311 case SSL3_ST_SW_CERT_A:
312 case SSL3_ST_SW_CERT_B:
313 /* Check if it is anon DH */
314 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
315 {
316 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
317 ret=dtls1_send_server_certificate(s);
318 if (ret <= 0) goto end;
319 }
320 else
321 skip=1;
322 s->state=SSL3_ST_SW_KEY_EXCH_A;
323 s->init_num=0;
324 break;
325
326 case SSL3_ST_SW_KEY_EXCH_A:
327 case SSL3_ST_SW_KEY_EXCH_B:
328 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
329
330 /* clear this, it may get reset by
331 * send_server_key_exchange */
332 if ((s->options & SSL_OP_EPHEMERAL_RSA)
333 #ifndef OPENSSL_NO_KRB5
334 && !(alg_k & SSL_kKRB5)
335 #endif /* OPENSSL_NO_KRB5 */
336 )
337 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
338 * even when forbidden by protocol specs
339 * (handshake may fail as clients are not required to
340 * be able to handle this) */
341 s->s3->tmp.use_rsa_tmp=1;
342 else
343 s->s3->tmp.use_rsa_tmp=0;
344
345 /* only send if a DH key exchange or
346 * RSA but we have a sign only certificate */
347 if (s->s3->tmp.use_rsa_tmp
348 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
349 || ((alg_k & SSL_kRSA)
350 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
351 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
352 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
353 )
354 )
355 )
356 )
357 {
358 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
359 ret=dtls1_send_server_key_exchange(s);
360 if (ret <= 0) goto end;
361 }
362 else
363 skip=1;
364
365 s->state=SSL3_ST_SW_CERT_REQ_A;
366 s->init_num=0;
367 break;
368
369 case SSL3_ST_SW_CERT_REQ_A:
370 case SSL3_ST_SW_CERT_REQ_B:
371 if (/* don't request cert unless asked for it: */
372 !(s->verify_mode & SSL_VERIFY_PEER) ||
373 /* if SSL_VERIFY_CLIENT_ONCE is set,
374 * don't request cert during re-negotiation: */
375 ((s->session->peer != NULL) &&
376 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
377 /* never request cert in anonymous ciphersuites
378 * (see section "Certificate request" in SSL 3 drafts
379 * and in RFC 2246): */
380 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
381 /* ... except when the application insists on verification
382 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
383 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
384 /* never request cert in Kerberos ciphersuites */
385 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
386 {
387 /* no cert request */
388 skip=1;
389 s->s3->tmp.cert_request=0;
390 s->state=SSL3_ST_SW_SRVR_DONE_A;
391 }
392 else
393 {
394 s->s3->tmp.cert_request=1;
395 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
396 ret=dtls1_send_certificate_request(s);
397 if (ret <= 0) goto end;
398 #ifndef NETSCAPE_HANG_BUG
399 s->state=SSL3_ST_SW_SRVR_DONE_A;
400 #else
401 s->state=SSL3_ST_SW_FLUSH;
402 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
403 #endif
404 s->init_num=0;
405 }
406 break;
407
408 case SSL3_ST_SW_SRVR_DONE_A:
409 case SSL3_ST_SW_SRVR_DONE_B:
410 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
411 ret=dtls1_send_server_done(s);
412 if (ret <= 0) goto end;
413 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
414 s->state=SSL3_ST_SW_FLUSH;
415 s->init_num=0;
416 break;
417
418 case SSL3_ST_SW_FLUSH:
419 /* number of bytes to be flushed */
420 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
421 if (num1 > 0)
422 {
423 s->rwstate=SSL_WRITING;
424 num1=BIO_flush(s->wbio);
425 if (num1 <= 0) { ret= -1; goto end; }
426 s->rwstate=SSL_NOTHING;
427 }
428
429 s->state=s->s3->tmp.next_state;
430 break;
431
432 case SSL3_ST_SR_CERT_A:
433 case SSL3_ST_SR_CERT_B:
434 /* Check for second client hello (MS SGC) */
435 ret = ssl3_check_client_hello(s);
436 if (ret <= 0)
437 goto end;
438 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
439 if (ret == 2)
440 s->state = SSL3_ST_SR_CLNT_HELLO_C;
441 else {
442 /* could be sent for a DH cert, even if we
443 * have not asked for it :-) */
444 ret=ssl3_get_client_certificate(s);
445 if (ret <= 0) goto end;
446 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
447 s->init_num=0;
448 s->state=SSL3_ST_SR_KEY_EXCH_A;
449 }
450 break;
451
452 case SSL3_ST_SR_KEY_EXCH_A:
453 case SSL3_ST_SR_KEY_EXCH_B:
454 ret=ssl3_get_client_key_exchange(s);
455 if (ret <= 0) goto end;
456 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
457 s->state=SSL3_ST_SR_CERT_VRFY_A;
458 s->init_num=0;
459
460 /* We need to get hashes here so if there is
461 * a client cert, it can be verified */
462 s->method->ssl3_enc->cert_verify_mac(s,
463 NID_md5,
464 &(s->s3->tmp.cert_verify_md[0]));
465 s->method->ssl3_enc->cert_verify_mac(s,
466 NID_sha1,
467 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
468
469 break;
470
471 case SSL3_ST_SR_CERT_VRFY_A:
472 case SSL3_ST_SR_CERT_VRFY_B:
473
474 /* we should decide if we expected this one */
475 ret=ssl3_get_cert_verify(s);
476 if (ret <= 0) goto end;
477 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
478
479 s->state=SSL3_ST_SR_FINISHED_A;
480 s->init_num=0;
481 break;
482
483 case SSL3_ST_SR_FINISHED_A:
484 case SSL3_ST_SR_FINISHED_B:
485 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
486 SSL3_ST_SR_FINISHED_B);
487 if (ret <= 0) goto end;
488 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
489 if (s->hit)
490 s->state=SSL_ST_OK;
491 else
492 s->state=SSL3_ST_SW_CHANGE_A;
493 s->init_num=0;
494 break;
495
496 case SSL3_ST_SW_CHANGE_A:
497 case SSL3_ST_SW_CHANGE_B:
498
499 s->session->cipher=s->s3->tmp.new_cipher;
500 if (!s->method->ssl3_enc->setup_key_block(s))
501 { ret= -1; goto end; }
502
503 ret=dtls1_send_change_cipher_spec(s,
504 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
505
506 if (ret <= 0) goto end;
507 s->state=SSL3_ST_SW_FINISHED_A;
508 s->init_num=0;
509
510 if (!s->method->ssl3_enc->change_cipher_state(s,
511 SSL3_CHANGE_CIPHER_SERVER_WRITE))
512 {
513 ret= -1;
514 goto end;
515 }
516
517 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
518 break;
519
520 case SSL3_ST_SW_FINISHED_A:
521 case SSL3_ST_SW_FINISHED_B:
522 ret=dtls1_send_finished(s,
523 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
524 s->method->ssl3_enc->server_finished_label,
525 s->method->ssl3_enc->server_finished_label_len);
526 if (ret <= 0) goto end;
527 s->state=SSL3_ST_SW_FLUSH;
528 if (s->hit)
529 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
530 else
531 s->s3->tmp.next_state=SSL_ST_OK;
532 s->init_num=0;
533 break;
534
535 case SSL_ST_OK:
536 /* clean a few things up */
537 ssl3_cleanup_key_block(s);
538
539 #if 0
540 BUF_MEM_free(s->init_buf);
541 s->init_buf=NULL;
542 #endif
543
544 /* remove buffering on output */
545 ssl_free_wbio_buffer(s);
546
547 s->init_num=0;
548
549 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
550 {
551 /* actually not necessarily a 'new' session unless
552 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
553
554 s->new_session=0;
555
556 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
557
558 s->ctx->stats.sess_accept_good++;
559 /* s->server=1; */
560 s->handshake_func=dtls1_accept;
561
562 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
563 }
564
565 ret = 1;
566
567 /* done handshaking, next message is client hello */
568 s->d1->handshake_read_seq = 0;
569 /* next message is server hello */
570 s->d1->handshake_write_seq = 0;
571 s->d1->next_handshake_write_seq = 0;
572 goto end;
573 /* break; */
574
575 default:
576 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
577 ret= -1;
578 goto end;
579 /* break; */
580 }
581
582 if (!s->s3->tmp.reuse_message && !skip)
583 {
584 if (s->debug)
585 {
586 if ((ret=BIO_flush(s->wbio)) <= 0)
587 goto end;
588 }
589
590
591 if ((cb != NULL) && (s->state != state))
592 {
593 new_state=s->state;
594 s->state=state;
595 cb(s,SSL_CB_ACCEPT_LOOP,1);
596 s->state=new_state;
597 }
598 }
599 skip=0;
600 }
601 end:
602 /* BIO_flush(s->wbio); */
603
604 s->in_handshake--;
605 if (cb != NULL)
606 cb(s,SSL_CB_ACCEPT_EXIT,ret);
607 return(ret);
608 }
609
610 int dtls1_send_hello_request(SSL *s)
611 {
612 unsigned char *p;
613
614 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
615 {
616 p=(unsigned char *)s->init_buf->data;
617 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
618
619 s->state=SSL3_ST_SW_HELLO_REQ_B;
620 /* number of bytes to write */
621 s->init_num=DTLS1_HM_HEADER_LENGTH;
622 s->init_off=0;
623
624 /* no need to buffer this message, since there are no retransmit
625 * requests for it */
626 }
627
628 /* SSL3_ST_SW_HELLO_REQ_B */
629 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
630 }
631
632 int dtls1_send_hello_verify_request(SSL *s)
633 {
634 unsigned int msg_len;
635 unsigned char *msg, *buf, *p;
636
637 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
638 {
639 buf = (unsigned char *)s->init_buf->data;
640
641 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
642 *(p++) = s->version >> 8;
643 *(p++) = s->version & 0xFF;
644
645 if (s->ctx->app_gen_cookie_cb != NULL &&
646 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
647 &(s->d1->cookie_len)) == 0)
648 {
649 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
650 return 0;
651 }
652 /* else the cookie is assumed to have
653 * been initialized by the application */
654
655 *(p++) = (unsigned char) s->d1->cookie_len;
656 memcpy(p, s->d1->cookie, s->d1->cookie_len);
657 p += s->d1->cookie_len;
658 msg_len = p - msg;
659
660 dtls1_set_message_header(s, buf,
661 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
662
663 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
664 /* number of bytes to write */
665 s->init_num=p-buf;
666 s->init_off=0;
667
668 /* buffer the message to handle re-xmits */
669 dtls1_buffer_message(s, 0);
670 }
671
672 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
673 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
674 }
675
676 int dtls1_send_server_hello(SSL *s)
677 {
678 unsigned char *buf;
679 unsigned char *p,*d;
680 int i;
681 unsigned int sl;
682 unsigned long l,Time;
683
684 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
685 {
686 buf=(unsigned char *)s->init_buf->data;
687 p=s->s3->server_random;
688 Time=(unsigned long)time(NULL); /* Time */
689 l2n(Time,p);
690 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
691 /* Do the message type and length last */
692 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
693
694 *(p++)=s->version>>8;
695 *(p++)=s->version&0xff;
696
697 /* Random stuff */
698 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
699 p+=SSL3_RANDOM_SIZE;
700
701 /* now in theory we have 3 options to sending back the
702 * session id. If it is a re-use, we send back the
703 * old session-id, if it is a new session, we send
704 * back the new session-id or we send back a 0 length
705 * session-id if we want it to be single use.
706 * Currently I will not implement the '0' length session-id
707 * 12-Jan-98 - I'll now support the '0' length stuff.
708 */
709 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
710 s->session->session_id_length=0;
711
712 sl=s->session->session_id_length;
713 if (sl > sizeof s->session->session_id)
714 {
715 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
716 return -1;
717 }
718 *(p++)=sl;
719 memcpy(p,s->session->session_id,sl);
720 p+=sl;
721
722 /* put the cipher */
723 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
724 p+=i;
725
726 /* put the compression method */
727 #ifdef OPENSSL_NO_COMP
728 *(p++)=0;
729 #else
730 if (s->s3->tmp.new_compression == NULL)
731 *(p++)=0;
732 else
733 *(p++)=s->s3->tmp.new_compression->id;
734 #endif
735
736 /* do the header */
737 l=(p-d);
738 d=buf;
739
740 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
741
742 s->state=SSL3_ST_SW_SRVR_HELLO_B;
743 /* number of bytes to write */
744 s->init_num=p-buf;
745 s->init_off=0;
746
747 /* buffer the message to handle re-xmits */
748 dtls1_buffer_message(s, 0);
749 }
750
751 /* SSL3_ST_SW_SRVR_HELLO_B */
752 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
753 }
754
755 int dtls1_send_server_done(SSL *s)
756 {
757 unsigned char *p;
758
759 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
760 {
761 p=(unsigned char *)s->init_buf->data;
762
763 /* do the header */
764 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
765
766 s->state=SSL3_ST_SW_SRVR_DONE_B;
767 /* number of bytes to write */
768 s->init_num=DTLS1_HM_HEADER_LENGTH;
769 s->init_off=0;
770
771 /* buffer the message to handle re-xmits */
772 dtls1_buffer_message(s, 0);
773 }
774
775 /* SSL3_ST_SW_SRVR_DONE_B */
776 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
777 }
778
779 int dtls1_send_server_key_exchange(SSL *s)
780 {
781 #ifndef OPENSSL_NO_RSA
782 unsigned char *q;
783 int j,num;
784 RSA *rsa;
785 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
786 unsigned int u;
787 #endif
788 #ifndef OPENSSL_NO_DH
789 DH *dh=NULL,*dhp;
790 #endif
791 EVP_PKEY *pkey;
792 unsigned char *p,*d;
793 int al,i;
794 unsigned long type;
795 int n;
796 CERT *cert;
797 BIGNUM *r[4];
798 int nr[4],kn;
799 BUF_MEM *buf;
800 EVP_MD_CTX md_ctx;
801
802 EVP_MD_CTX_init(&md_ctx);
803 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
804 {
805 type=s->s3->tmp.new_cipher->algorithm_mkey;
806 cert=s->cert;
807
808 buf=s->init_buf;
809
810 r[0]=r[1]=r[2]=r[3]=NULL;
811 n=0;
812 #ifndef OPENSSL_NO_RSA
813 if (type & SSL_kRSA)
814 {
815 rsa=cert->rsa_tmp;
816 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
817 {
818 rsa=s->cert->rsa_tmp_cb(s,
819 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
820 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
821 if(rsa == NULL)
822 {
823 al=SSL_AD_HANDSHAKE_FAILURE;
824 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
825 goto f_err;
826 }
827 RSA_up_ref(rsa);
828 cert->rsa_tmp=rsa;
829 }
830 if (rsa == NULL)
831 {
832 al=SSL_AD_HANDSHAKE_FAILURE;
833 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
834 goto f_err;
835 }
836 r[0]=rsa->n;
837 r[1]=rsa->e;
838 s->s3->tmp.use_rsa_tmp=1;
839 }
840 else
841 #endif
842 #ifndef OPENSSL_NO_DH
843 if (type & SSL_kEDH)
844 {
845 dhp=cert->dh_tmp;
846 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
847 dhp=s->cert->dh_tmp_cb(s,
848 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
849 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
850 if (dhp == NULL)
851 {
852 al=SSL_AD_HANDSHAKE_FAILURE;
853 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
854 goto f_err;
855 }
856
857 if (s->s3->tmp.dh != NULL)
858 {
859 DH_free(dh);
860 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
861 goto err;
862 }
863
864 if ((dh=DHparams_dup(dhp)) == NULL)
865 {
866 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
867 goto err;
868 }
869
870 s->s3->tmp.dh=dh;
871 if ((dhp->pub_key == NULL ||
872 dhp->priv_key == NULL ||
873 (s->options & SSL_OP_SINGLE_DH_USE)))
874 {
875 if(!DH_generate_key(dh))
876 {
877 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
878 ERR_R_DH_LIB);
879 goto err;
880 }
881 }
882 else
883 {
884 dh->pub_key=BN_dup(dhp->pub_key);
885 dh->priv_key=BN_dup(dhp->priv_key);
886 if ((dh->pub_key == NULL) ||
887 (dh->priv_key == NULL))
888 {
889 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
890 goto err;
891 }
892 }
893 r[0]=dh->p;
894 r[1]=dh->g;
895 r[2]=dh->pub_key;
896 }
897 else
898 #endif
899 {
900 al=SSL_AD_HANDSHAKE_FAILURE;
901 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
902 goto f_err;
903 }
904 for (i=0; r[i] != NULL; i++)
905 {
906 nr[i]=BN_num_bytes(r[i]);
907 n+=2+nr[i];
908 }
909
910 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
911 {
912 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
913 == NULL)
914 {
915 al=SSL_AD_DECODE_ERROR;
916 goto f_err;
917 }
918 kn=EVP_PKEY_size(pkey);
919 }
920 else
921 {
922 pkey=NULL;
923 kn=0;
924 }
925
926 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
927 {
928 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
929 goto err;
930 }
931 d=(unsigned char *)s->init_buf->data;
932 p= &(d[DTLS1_HM_HEADER_LENGTH]);
933
934 for (i=0; r[i] != NULL; i++)
935 {
936 s2n(nr[i],p);
937 BN_bn2bin(r[i],p);
938 p+=nr[i];
939 }
940
941 /* not anonymous */
942 if (pkey != NULL)
943 {
944 /* n is the length of the params, they start at
945 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
946 * at the end. */
947 #ifndef OPENSSL_NO_RSA
948 if (pkey->type == EVP_PKEY_RSA)
949 {
950 q=md_buf;
951 j=0;
952 for (num=2; num > 0; num--)
953 {
954 EVP_DigestInit_ex(&md_ctx,(num == 2)
955 ?s->ctx->md5:s->ctx->sha1, NULL);
956 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
957 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
958 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
959 EVP_DigestFinal_ex(&md_ctx,q,
960 (unsigned int *)&i);
961 q+=i;
962 j+=i;
963 }
964 if (RSA_sign(NID_md5_sha1, md_buf, j,
965 &(p[2]), &u, pkey->pkey.rsa) <= 0)
966 {
967 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
968 goto err;
969 }
970 s2n(u,p);
971 n+=u+2;
972 }
973 else
974 #endif
975 #if !defined(OPENSSL_NO_DSA)
976 if (pkey->type == EVP_PKEY_DSA)
977 {
978 /* lets do DSS */
979 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
980 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
981 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
982 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
983 if (!EVP_SignFinal(&md_ctx,&(p[2]),
984 (unsigned int *)&i,pkey))
985 {
986 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
987 goto err;
988 }
989 s2n(i,p);
990 n+=i+2;
991 }
992 else
993 #endif
994 {
995 /* Is this error check actually needed? */
996 al=SSL_AD_HANDSHAKE_FAILURE;
997 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
998 goto f_err;
999 }
1000 }
1001
1002 d = dtls1_set_message_header(s, d,
1003 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1004
1005 /* we should now have things packed up, so lets send
1006 * it off */
1007 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1008 s->init_off=0;
1009
1010 /* buffer the message to handle re-xmits */
1011 dtls1_buffer_message(s, 0);
1012 }
1013
1014 s->state = SSL3_ST_SW_KEY_EXCH_B;
1015 EVP_MD_CTX_cleanup(&md_ctx);
1016 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1017 f_err:
1018 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1019 err:
1020 EVP_MD_CTX_cleanup(&md_ctx);
1021 return(-1);
1022 }
1023
1024 int dtls1_send_certificate_request(SSL *s)
1025 {
1026 unsigned char *p,*d;
1027 int i,j,nl,off,n;
1028 STACK_OF(X509_NAME) *sk=NULL;
1029 X509_NAME *name;
1030 BUF_MEM *buf;
1031 unsigned int msg_len;
1032
1033 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1034 {
1035 buf=s->init_buf;
1036
1037 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1038
1039 /* get the list of acceptable cert types */
1040 p++;
1041 n=ssl3_get_req_cert_type(s,p);
1042 d[0]=n;
1043 p+=n;
1044 n++;
1045
1046 off=n;
1047 p+=2;
1048 n+=2;
1049
1050 sk=SSL_get_client_CA_list(s);
1051 nl=0;
1052 if (sk != NULL)
1053 {
1054 for (i=0; i<sk_X509_NAME_num(sk); i++)
1055 {
1056 name=sk_X509_NAME_value(sk,i);
1057 j=i2d_X509_NAME(name,NULL);
1058 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1059 {
1060 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1061 goto err;
1062 }
1063 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1064 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1065 {
1066 s2n(j,p);
1067 i2d_X509_NAME(name,&p);
1068 n+=2+j;
1069 nl+=2+j;
1070 }
1071 else
1072 {
1073 d=p;
1074 i2d_X509_NAME(name,&p);
1075 j-=2; s2n(j,d); j+=2;
1076 n+=j;
1077 nl+=j;
1078 }
1079 }
1080 }
1081 /* else no CA names */
1082 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1083 s2n(nl,p);
1084
1085 d=(unsigned char *)buf->data;
1086 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1087 l2n3(n,d);
1088 s2n(s->d1->handshake_write_seq,d);
1089 s->d1->handshake_write_seq++;
1090
1091 /* we should now have things packed up, so lets send
1092 * it off */
1093
1094 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1095 s->init_off=0;
1096 #ifdef NETSCAPE_HANG_BUG
1097 /* XXX: what to do about this? */
1098 p=(unsigned char *)s->init_buf->data + s->init_num;
1099
1100 /* do the header */
1101 *(p++)=SSL3_MT_SERVER_DONE;
1102 *(p++)=0;
1103 *(p++)=0;
1104 *(p++)=0;
1105 s->init_num += 4;
1106 #endif
1107
1108 /* XDTLS: set message header ? */
1109 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1110 dtls1_set_message_header(s, (void *)s->init_buf->data,
1111 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1112
1113 /* buffer the message to handle re-xmits */
1114 dtls1_buffer_message(s, 0);
1115
1116 s->state = SSL3_ST_SW_CERT_REQ_B;
1117 }
1118
1119 /* SSL3_ST_SW_CERT_REQ_B */
1120 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1121 err:
1122 return(-1);
1123 }
1124
1125 int dtls1_send_server_certificate(SSL *s)
1126 {
1127 unsigned long l;
1128 X509 *x;
1129
1130 if (s->state == SSL3_ST_SW_CERT_A)
1131 {
1132 x=ssl_get_server_send_cert(s);
1133 if (x == NULL)
1134 {
1135 /* VRS: allow null cert if auth == KRB5 */
1136 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1137 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1138 {
1139 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1140 return(0);
1141 }
1142 }
1143
1144 l=dtls1_output_cert_chain(s,x);
1145 s->state=SSL3_ST_SW_CERT_B;
1146 s->init_num=(int)l;
1147 s->init_off=0;
1148
1149 /* buffer the message to handle re-xmits */
1150 dtls1_buffer_message(s, 0);
1151 }
1152
1153 /* SSL3_ST_SW_CERT_B */
1154 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1155 }
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