]> git.ipfire.org Git - thirdparty/openssl.git/blob - ssl/d1_srvr.c
projects / thirdparty / openssl.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Updates from 1.0.0-stable branch.
[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 if (s->version != DTLS1_BAD_VER)
296 ssl3_init_finished_mac(s);
297 break;
298
299 case SSL3_ST_SW_SRVR_HELLO_A:
300 case SSL3_ST_SW_SRVR_HELLO_B:
301 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
302 ret=dtls1_send_server_hello(s);
303 if (ret <= 0) goto end;
304
305 if (s->hit)
306 s->state=SSL3_ST_SW_CHANGE_A;
307 else
308 s->state=SSL3_ST_SW_CERT_A;
309 s->init_num=0;
310 break;
311
312 case SSL3_ST_SW_CERT_A:
313 case SSL3_ST_SW_CERT_B:
314 /* Check if it is anon DH */
315 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
316 {
317 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
318 ret=dtls1_send_server_certificate(s);
319 if (ret <= 0) goto end;
320 }
321 else
322 skip=1;
323 s->state=SSL3_ST_SW_KEY_EXCH_A;
324 s->init_num=0;
325 break;
326
327 case SSL3_ST_SW_KEY_EXCH_A:
328 case SSL3_ST_SW_KEY_EXCH_B:
329 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
330
331 /* clear this, it may get reset by
332 * send_server_key_exchange */
333 if ((s->options & SSL_OP_EPHEMERAL_RSA)
334 #ifndef OPENSSL_NO_KRB5
335 && !(alg_k & SSL_kKRB5)
336 #endif /* OPENSSL_NO_KRB5 */
337 )
338 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
339 * even when forbidden by protocol specs
340 * (handshake may fail as clients are not required to
341 * be able to handle this) */
342 s->s3->tmp.use_rsa_tmp=1;
343 else
344 s->s3->tmp.use_rsa_tmp=0;
345
346 /* only send if a DH key exchange or
347 * RSA but we have a sign only certificate */
348 if (s->s3->tmp.use_rsa_tmp
349 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
350 || ((alg_k & SSL_kRSA)
351 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
352 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
353 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
354 )
355 )
356 )
357 )
358 {
359 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
360 ret=dtls1_send_server_key_exchange(s);
361 if (ret <= 0) goto end;
362 }
363 else
364 skip=1;
365
366 s->state=SSL3_ST_SW_CERT_REQ_A;
367 s->init_num=0;
368 break;
369
370 case SSL3_ST_SW_CERT_REQ_A:
371 case SSL3_ST_SW_CERT_REQ_B:
372 if (/* don't request cert unless asked for it: */
373 !(s->verify_mode & SSL_VERIFY_PEER) ||
374 /* if SSL_VERIFY_CLIENT_ONCE is set,
375 * don't request cert during re-negotiation: */
376 ((s->session->peer != NULL) &&
377 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
378 /* never request cert in anonymous ciphersuites
379 * (see section "Certificate request" in SSL 3 drafts
380 * and in RFC 2246): */
381 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
382 /* ... except when the application insists on verification
383 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
384 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
385 /* never request cert in Kerberos ciphersuites */
386 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
387 {
388 /* no cert request */
389 skip=1;
390 s->s3->tmp.cert_request=0;
391 s->state=SSL3_ST_SW_SRVR_DONE_A;
392 }
393 else
394 {
395 s->s3->tmp.cert_request=1;
396 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
397 ret=dtls1_send_certificate_request(s);
398 if (ret <= 0) goto end;
399 #ifndef NETSCAPE_HANG_BUG
400 s->state=SSL3_ST_SW_SRVR_DONE_A;
401 #else
402 s->state=SSL3_ST_SW_FLUSH;
403 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
404 #endif
405 s->init_num=0;
406 }
407 break;
408
409 case SSL3_ST_SW_SRVR_DONE_A:
410 case SSL3_ST_SW_SRVR_DONE_B:
411 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
412 ret=dtls1_send_server_done(s);
413 if (ret <= 0) goto end;
414 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
415 s->state=SSL3_ST_SW_FLUSH;
416 s->init_num=0;
417 break;
418
419 case SSL3_ST_SW_FLUSH:
420 /* number of bytes to be flushed */
421 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
422 if (num1 > 0)
423 {
424 s->rwstate=SSL_WRITING;
425 num1=BIO_flush(s->wbio);
426 if (num1 <= 0) { ret= -1; goto end; }
427 s->rwstate=SSL_NOTHING;
428 }
429
430 s->state=s->s3->tmp.next_state;
431 break;
432
433 case SSL3_ST_SR_CERT_A:
434 case SSL3_ST_SR_CERT_B:
435 /* Check for second client hello (MS SGC) */
436 ret = ssl3_check_client_hello(s);
437 if (ret <= 0)
438 goto end;
439 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
440 if (ret == 2)
441 s->state = SSL3_ST_SR_CLNT_HELLO_C;
442 else {
443 /* could be sent for a DH cert, even if we
444 * have not asked for it :-) */
445 ret=ssl3_get_client_certificate(s);
446 if (ret <= 0) goto end;
447 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
448 s->init_num=0;
449 s->state=SSL3_ST_SR_KEY_EXCH_A;
450 }
451 break;
452
453 case SSL3_ST_SR_KEY_EXCH_A:
454 case SSL3_ST_SR_KEY_EXCH_B:
455 ret=ssl3_get_client_key_exchange(s);
456 if (ret <= 0) goto end;
457 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
458 s->state=SSL3_ST_SR_CERT_VRFY_A;
459 s->init_num=0;
460
461 /* We need to get hashes here so if there is
462 * a client cert, it can be verified */
463 s->method->ssl3_enc->cert_verify_mac(s,
464 NID_md5,
465 &(s->s3->tmp.cert_verify_md[0]));
466 s->method->ssl3_enc->cert_verify_mac(s,
467 NID_sha1,
468 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
469
470 break;
471
472 case SSL3_ST_SR_CERT_VRFY_A:
473 case SSL3_ST_SR_CERT_VRFY_B:
474
475 /* we should decide if we expected this one */
476 ret=ssl3_get_cert_verify(s);
477 if (ret <= 0) goto end;
478 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
479
480 s->state=SSL3_ST_SR_FINISHED_A;
481 s->init_num=0;
482 break;
483
484 case SSL3_ST_SR_FINISHED_A:
485 case SSL3_ST_SR_FINISHED_B:
486 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
487 SSL3_ST_SR_FINISHED_B);
488 if (ret <= 0) goto end;
489 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
490 if (s->hit)
491 s->state=SSL_ST_OK;
492 else
493 s->state=SSL3_ST_SW_CHANGE_A;
494 s->init_num=0;
495 break;
496
497 case SSL3_ST_SW_CHANGE_A:
498 case SSL3_ST_SW_CHANGE_B:
499
500 s->session->cipher=s->s3->tmp.new_cipher;
501 if (!s->method->ssl3_enc->setup_key_block(s))
502 { ret= -1; goto end; }
503
504 ret=dtls1_send_change_cipher_spec(s,
505 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
506
507 if (ret <= 0) goto end;
508 s->state=SSL3_ST_SW_FINISHED_A;
509 s->init_num=0;
510
511 if (!s->method->ssl3_enc->change_cipher_state(s,
512 SSL3_CHANGE_CIPHER_SERVER_WRITE))
513 {
514 ret= -1;
515 goto end;
516 }
517
518 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
519 break;
520
521 case SSL3_ST_SW_FINISHED_A:
522 case SSL3_ST_SW_FINISHED_B:
523 ret=dtls1_send_finished(s,
524 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
525 s->method->ssl3_enc->server_finished_label,
526 s->method->ssl3_enc->server_finished_label_len);
527 if (ret <= 0) goto end;
528 s->state=SSL3_ST_SW_FLUSH;
529 if (s->hit)
530 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
531 else
532 s->s3->tmp.next_state=SSL_ST_OK;
533 s->init_num=0;
534 break;
535
536 case SSL_ST_OK:
537 /* clean a few things up */
538 ssl3_cleanup_key_block(s);
539
540 #if 0
541 BUF_MEM_free(s->init_buf);
542 s->init_buf=NULL;
543 #endif
544
545 /* remove buffering on output */
546 ssl_free_wbio_buffer(s);
547
548 s->init_num=0;
549
550 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
551 {
552 /* actually not necessarily a 'new' session unless
553 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
554
555 s->new_session=0;
556
557 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
558
559 s->ctx->stats.sess_accept_good++;
560 /* s->server=1; */
561 s->handshake_func=dtls1_accept;
562
563 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
564 }
565
566 ret = 1;
567
568 /* done handshaking, next message is client hello */
569 s->d1->handshake_read_seq = 0;
570 /* next message is server hello */
571 s->d1->handshake_write_seq = 0;
572 s->d1->next_handshake_write_seq = 0;
573 goto end;
574 /* break; */
575
576 default:
577 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
578 ret= -1;
579 goto end;
580 /* break; */
581 }
582
583 if (!s->s3->tmp.reuse_message && !skip)
584 {
585 if (s->debug)
586 {
587 if ((ret=BIO_flush(s->wbio)) <= 0)
588 goto end;
589 }
590
591
592 if ((cb != NULL) && (s->state != state))
593 {
594 new_state=s->state;
595 s->state=state;
596 cb(s,SSL_CB_ACCEPT_LOOP,1);
597 s->state=new_state;
598 }
599 }
600 skip=0;
601 }
602 end:
603 /* BIO_flush(s->wbio); */
604
605 s->in_handshake--;
606 if (cb != NULL)
607 cb(s,SSL_CB_ACCEPT_EXIT,ret);
608 return(ret);
609 }
610
611 int dtls1_send_hello_request(SSL *s)
612 {
613 unsigned char *p;
614
615 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
616 {
617 p=(unsigned char *)s->init_buf->data;
618 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
619
620 s->state=SSL3_ST_SW_HELLO_REQ_B;
621 /* number of bytes to write */
622 s->init_num=DTLS1_HM_HEADER_LENGTH;
623 s->init_off=0;
624
625 /* no need to buffer this message, since there are no retransmit
626 * requests for it */
627 }
628
629 /* SSL3_ST_SW_HELLO_REQ_B */
630 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
631 }
632
633 int dtls1_send_hello_verify_request(SSL *s)
634 {
635 unsigned int msg_len;
636 unsigned char *msg, *buf, *p;
637
638 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
639 {
640 buf = (unsigned char *)s->init_buf->data;
641
642 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
643 *(p++) = s->version >> 8;
644 *(p++) = s->version & 0xFF;
645
646 if (s->ctx->app_gen_cookie_cb != NULL &&
647 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
648 &(s->d1->cookie_len)) == 0)
649 {
650 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
651 return 0;
652 }
653 /* else the cookie is assumed to have
654 * been initialized by the application */
655
656 *(p++) = (unsigned char) s->d1->cookie_len;
657 memcpy(p, s->d1->cookie, s->d1->cookie_len);
658 p += s->d1->cookie_len;
659 msg_len = p - msg;
660
661 dtls1_set_message_header(s, buf,
662 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
663
664 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
665 /* number of bytes to write */
666 s->init_num=p-buf;
667 s->init_off=0;
668
669 /* buffer the message to handle re-xmits */
670 dtls1_buffer_message(s, 0);
671 }
672
673 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
674 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
675 }
676
677 int dtls1_send_server_hello(SSL *s)
678 {
679 unsigned char *buf;
680 unsigned char *p,*d;
681 int i;
682 unsigned int sl;
683 unsigned long l,Time;
684
685 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
686 {
687 buf=(unsigned char *)s->init_buf->data;
688 p=s->s3->server_random;
689 Time=(unsigned long)time(NULL); /* Time */
690 l2n(Time,p);
691 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
692 /* Do the message type and length last */
693 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
694
695 *(p++)=s->version>>8;
696 *(p++)=s->version&0xff;
697
698 /* Random stuff */
699 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
700 p+=SSL3_RANDOM_SIZE;
701
702 /* now in theory we have 3 options to sending back the
703 * session id. If it is a re-use, we send back the
704 * old session-id, if it is a new session, we send
705 * back the new session-id or we send back a 0 length
706 * session-id if we want it to be single use.
707 * Currently I will not implement the '0' length session-id
708 * 12-Jan-98 - I'll now support the '0' length stuff.
709 */
710 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
711 s->session->session_id_length=0;
712
713 sl=s->session->session_id_length;
714 if (sl > sizeof s->session->session_id)
715 {
716 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
717 return -1;
718 }
719 *(p++)=sl;
720 memcpy(p,s->session->session_id,sl);
721 p+=sl;
722
723 /* put the cipher */
724 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
725 p+=i;
726
727 /* put the compression method */
728 #ifdef OPENSSL_NO_COMP
729 *(p++)=0;
730 #else
731 if (s->s3->tmp.new_compression == NULL)
732 *(p++)=0;
733 else
734 *(p++)=s->s3->tmp.new_compression->id;
735 #endif
736
737 /* do the header */
738 l=(p-d);
739 d=buf;
740
741 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
742
743 s->state=SSL3_ST_SW_SRVR_HELLO_B;
744 /* number of bytes to write */
745 s->init_num=p-buf;
746 s->init_off=0;
747
748 /* buffer the message to handle re-xmits */
749 dtls1_buffer_message(s, 0);
750 }
751
752 /* SSL3_ST_SW_SRVR_HELLO_B */
753 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
754 }
755
756 int dtls1_send_server_done(SSL *s)
757 {
758 unsigned char *p;
759
760 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
761 {
762 p=(unsigned char *)s->init_buf->data;
763
764 /* do the header */
765 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
766
767 s->state=SSL3_ST_SW_SRVR_DONE_B;
768 /* number of bytes to write */
769 s->init_num=DTLS1_HM_HEADER_LENGTH;
770 s->init_off=0;
771
772 /* buffer the message to handle re-xmits */
773 dtls1_buffer_message(s, 0);
774 }
775
776 /* SSL3_ST_SW_SRVR_DONE_B */
777 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
778 }
779
780 int dtls1_send_server_key_exchange(SSL *s)
781 {
782 #ifndef OPENSSL_NO_RSA
783 unsigned char *q;
784 int j,num;
785 RSA *rsa;
786 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
787 unsigned int u;
788 #endif
789 #ifndef OPENSSL_NO_DH
790 DH *dh=NULL,*dhp;
791 #endif
792 EVP_PKEY *pkey;
793 unsigned char *p,*d;
794 int al,i;
795 unsigned long type;
796 int n;
797 CERT *cert;
798 BIGNUM *r[4];
799 int nr[4],kn;
800 BUF_MEM *buf;
801 EVP_MD_CTX md_ctx;
802
803 EVP_MD_CTX_init(&md_ctx);
804 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
805 {
806 type=s->s3->tmp.new_cipher->algorithm_mkey;
807 cert=s->cert;
808
809 buf=s->init_buf;
810
811 r[0]=r[1]=r[2]=r[3]=NULL;
812 n=0;
813 #ifndef OPENSSL_NO_RSA
814 if (type & SSL_kRSA)
815 {
816 rsa=cert->rsa_tmp;
817 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
818 {
819 rsa=s->cert->rsa_tmp_cb(s,
820 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
821 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
822 if(rsa == NULL)
823 {
824 al=SSL_AD_HANDSHAKE_FAILURE;
825 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
826 goto f_err;
827 }
828 RSA_up_ref(rsa);
829 cert->rsa_tmp=rsa;
830 }
831 if (rsa == NULL)
832 {
833 al=SSL_AD_HANDSHAKE_FAILURE;
834 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
835 goto f_err;
836 }
837 r[0]=rsa->n;
838 r[1]=rsa->e;
839 s->s3->tmp.use_rsa_tmp=1;
840 }
841 else
842 #endif
843 #ifndef OPENSSL_NO_DH
844 if (type & SSL_kEDH)
845 {
846 dhp=cert->dh_tmp;
847 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
848 dhp=s->cert->dh_tmp_cb(s,
849 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
850 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
851 if (dhp == NULL)
852 {
853 al=SSL_AD_HANDSHAKE_FAILURE;
854 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
855 goto f_err;
856 }
857
858 if (s->s3->tmp.dh != NULL)
859 {
860 DH_free(dh);
861 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
862 goto err;
863 }
864
865 if ((dh=DHparams_dup(dhp)) == NULL)
866 {
867 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
868 goto err;
869 }
870
871 s->s3->tmp.dh=dh;
872 if ((dhp->pub_key == NULL ||
873 dhp->priv_key == NULL ||
874 (s->options & SSL_OP_SINGLE_DH_USE)))
875 {
876 if(!DH_generate_key(dh))
877 {
878 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
879 ERR_R_DH_LIB);
880 goto err;
881 }
882 }
883 else
884 {
885 dh->pub_key=BN_dup(dhp->pub_key);
886 dh->priv_key=BN_dup(dhp->priv_key);
887 if ((dh->pub_key == NULL) ||
888 (dh->priv_key == NULL))
889 {
890 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
891 goto err;
892 }
893 }
894 r[0]=dh->p;
895 r[1]=dh->g;
896 r[2]=dh->pub_key;
897 }
898 else
899 #endif
900 {
901 al=SSL_AD_HANDSHAKE_FAILURE;
902 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
903 goto f_err;
904 }
905 for (i=0; r[i] != NULL; i++)
906 {
907 nr[i]=BN_num_bytes(r[i]);
908 n+=2+nr[i];
909 }
910
911 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
912 {
913 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
914 == NULL)
915 {
916 al=SSL_AD_DECODE_ERROR;
917 goto f_err;
918 }
919 kn=EVP_PKEY_size(pkey);
920 }
921 else
922 {
923 pkey=NULL;
924 kn=0;
925 }
926
927 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
928 {
929 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
930 goto err;
931 }
932 d=(unsigned char *)s->init_buf->data;
933 p= &(d[DTLS1_HM_HEADER_LENGTH]);
934
935 for (i=0; r[i] != NULL; i++)
936 {
937 s2n(nr[i],p);
938 BN_bn2bin(r[i],p);
939 p+=nr[i];
940 }
941
942 /* not anonymous */
943 if (pkey != NULL)
944 {
945 /* n is the length of the params, they start at
946 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
947 * at the end. */
948 #ifndef OPENSSL_NO_RSA
949 if (pkey->type == EVP_PKEY_RSA)
950 {
951 q=md_buf;
952 j=0;
953 for (num=2; num > 0; num--)
954 {
955 EVP_DigestInit_ex(&md_ctx,(num == 2)
956 ?s->ctx->md5:s->ctx->sha1, NULL);
957 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
958 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
959 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
960 EVP_DigestFinal_ex(&md_ctx,q,
961 (unsigned int *)&i);
962 q+=i;
963 j+=i;
964 }
965 if (RSA_sign(NID_md5_sha1, md_buf, j,
966 &(p[2]), &u, pkey->pkey.rsa) <= 0)
967 {
968 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
969 goto err;
970 }
971 s2n(u,p);
972 n+=u+2;
973 }
974 else
975 #endif
976 #if !defined(OPENSSL_NO_DSA)
977 if (pkey->type == EVP_PKEY_DSA)
978 {
979 /* lets do DSS */
980 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
981 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
982 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
983 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
984 if (!EVP_SignFinal(&md_ctx,&(p[2]),
985 (unsigned int *)&i,pkey))
986 {
987 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
988 goto err;
989 }
990 s2n(i,p);
991 n+=i+2;
992 }
993 else
994 #endif
995 {
996 /* Is this error check actually needed? */
997 al=SSL_AD_HANDSHAKE_FAILURE;
998 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
999 goto f_err;
1000 }
1001 }
1002
1003 d = dtls1_set_message_header(s, d,
1004 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1005
1006 /* we should now have things packed up, so lets send
1007 * it off */
1008 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1009 s->init_off=0;
1010
1011 /* buffer the message to handle re-xmits */
1012 dtls1_buffer_message(s, 0);
1013 }
1014
1015 s->state = SSL3_ST_SW_KEY_EXCH_B;
1016 EVP_MD_CTX_cleanup(&md_ctx);
1017 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1018 f_err:
1019 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1020 err:
1021 EVP_MD_CTX_cleanup(&md_ctx);
1022 return(-1);
1023 }
1024
1025 int dtls1_send_certificate_request(SSL *s)
1026 {
1027 unsigned char *p,*d;
1028 int i,j,nl,off,n;
1029 STACK_OF(X509_NAME) *sk=NULL;
1030 X509_NAME *name;
1031 BUF_MEM *buf;
1032 unsigned int msg_len;
1033
1034 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1035 {
1036 buf=s->init_buf;
1037
1038 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1039
1040 /* get the list of acceptable cert types */
1041 p++;
1042 n=ssl3_get_req_cert_type(s,p);
1043 d[0]=n;
1044 p+=n;
1045 n++;
1046
1047 off=n;
1048 p+=2;
1049 n+=2;
1050
1051 sk=SSL_get_client_CA_list(s);
1052 nl=0;
1053 if (sk != NULL)
1054 {
1055 for (i=0; i<sk_X509_NAME_num(sk); i++)
1056 {
1057 name=sk_X509_NAME_value(sk,i);
1058 j=i2d_X509_NAME(name,NULL);
1059 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1060 {
1061 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1062 goto err;
1063 }
1064 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1065 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1066 {
1067 s2n(j,p);
1068 i2d_X509_NAME(name,&p);
1069 n+=2+j;
1070 nl+=2+j;
1071 }
1072 else
1073 {
1074 d=p;
1075 i2d_X509_NAME(name,&p);
1076 j-=2; s2n(j,d); j+=2;
1077 n+=j;
1078 nl+=j;
1079 }
1080 }
1081 }
1082 /* else no CA names */
1083 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1084 s2n(nl,p);
1085
1086 d=(unsigned char *)buf->data;
1087 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1088 l2n3(n,d);
1089 s2n(s->d1->handshake_write_seq,d);
1090 s->d1->handshake_write_seq++;
1091
1092 /* we should now have things packed up, so lets send
1093 * it off */
1094
1095 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1096 s->init_off=0;
1097 #ifdef NETSCAPE_HANG_BUG
1098 /* XXX: what to do about this? */
1099 p=(unsigned char *)s->init_buf->data + s->init_num;
1100
1101 /* do the header */
1102 *(p++)=SSL3_MT_SERVER_DONE;
1103 *(p++)=0;
1104 *(p++)=0;
1105 *(p++)=0;
1106 s->init_num += 4;
1107 #endif
1108
1109 /* XDTLS: set message header ? */
1110 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1111 dtls1_set_message_header(s, (void *)s->init_buf->data,
1112 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1113
1114 /* buffer the message to handle re-xmits */
1115 dtls1_buffer_message(s, 0);
1116
1117 s->state = SSL3_ST_SW_CERT_REQ_B;
1118 }
1119
1120 /* SSL3_ST_SW_CERT_REQ_B */
1121 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1122 err:
1123 return(-1);
1124 }
1125
1126 int dtls1_send_server_certificate(SSL *s)
1127 {
1128 unsigned long l;
1129 X509 *x;
1130
1131 if (s->state == SSL3_ST_SW_CERT_A)
1132 {
1133 x=ssl_get_server_send_cert(s);
1134 if (x == NULL)
1135 {
1136 /* VRS: allow null cert if auth == KRB5 */
1137 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1138 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1139 {
1140 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1141 return(0);
1142 }
1143 }
1144
1145 l=dtls1_output_cert_chain(s,x);
1146 s->state=SSL3_ST_SW_CERT_B;
1147 s->init_num=(int)l;
1148 s->init_off=0;
1149
1150 /* buffer the message to handle re-xmits */
1151 dtls1_buffer_message(s, 0);
1152 }
1153
1154 /* SSL3_ST_SW_CERT_B */
1155 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1156 }
A mirror of the official openssl repository