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[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 unsigned long alg_k;
151 int ret= -1;
152 int new_state,state,skip=0;
153 int listen;
154 #ifndef OPENSSL_NO_SCTP
155 unsigned char sctpauthkey[64];
156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
157 #endif
158
159 RAND_add(&Time,sizeof(Time),0);
160 ERR_clear_error();
161 clear_sys_error();
162
163 if (s->info_callback != NULL)
164 cb=s->info_callback;
165 else if (s->ctx->info_callback != NULL)
166 cb=s->ctx->info_callback;
167
168 listen = s->d1->listen;
169
170 /* init things to blank */
171 s->in_handshake++;
172 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
173
174 s->d1->listen = listen;
175 #ifndef OPENSSL_NO_SCTP
176 /* Notify SCTP BIO socket to enter handshake
177 * mode and prevent stream identifier other
178 * than 0. Will be ignored if no SCTP is used.
179 */
180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
181 #endif
182
183 if (s->cert == NULL)
184 {
185 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
186 return(-1);
187 }
188
189 #ifndef OPENSSL_NO_HEARTBEATS
190 /* If we're awaiting a HeartbeatResponse, pretend we
191 * already got and don't await it anymore, because
192 * Heartbeats don't make sense during handshakes anyway.
193 */
194 if (s->tlsext_hb_pending)
195 {
196 dtls1_stop_timer(s);
197 s->tlsext_hb_pending = 0;
198 s->tlsext_hb_seq++;
199 }
200 #endif
201
202 for (;;)
203 {
204 state=s->state;
205
206 switch (s->state)
207 {
208 case SSL_ST_RENEGOTIATE:
209 s->renegotiate=1;
210 /* s->state=SSL_ST_ACCEPT; */
211
212 case SSL_ST_BEFORE:
213 case SSL_ST_ACCEPT:
214 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
215 case SSL_ST_OK|SSL_ST_ACCEPT:
216
217 s->server=1;
218 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
219
220 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
221 {
222 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
223 return -1;
224 }
225 s->type=SSL_ST_ACCEPT;
226
227 if (s->init_buf == NULL)
228 {
229 if ((buf=BUF_MEM_new()) == NULL)
230 {
231 ret= -1;
232 goto end;
233 }
234 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
235 {
236 ret= -1;
237 goto end;
238 }
239 s->init_buf=buf;
240 }
241
242 if (!ssl3_setup_buffers(s))
243 {
244 ret= -1;
245 goto end;
246 }
247
248 s->init_num=0;
249
250 if (s->state != SSL_ST_RENEGOTIATE)
251 {
252 /* Ok, we now need to push on a buffering BIO so that
253 * the output is sent in a way that TCP likes :-)
254 * ...but not with SCTP :-)
255 */
256 #ifndef OPENSSL_NO_SCTP
257 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
258 #endif
259 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
260
261 ssl3_init_finished_mac(s);
262 s->state=SSL3_ST_SR_CLNT_HELLO_A;
263 s->ctx->stats.sess_accept++;
264 }
265 else
266 {
267 /* s->state == SSL_ST_RENEGOTIATE,
268 * we will just send a HelloRequest */
269 s->ctx->stats.sess_accept_renegotiate++;
270 s->state=SSL3_ST_SW_HELLO_REQ_A;
271 }
272
273 break;
274
275 case SSL3_ST_SW_HELLO_REQ_A:
276 case SSL3_ST_SW_HELLO_REQ_B:
277
278 s->shutdown=0;
279 dtls1_start_timer(s);
280 ret=dtls1_send_hello_request(s);
281 if (ret <= 0) goto end;
282 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
283 s->state=SSL3_ST_SW_FLUSH;
284 s->init_num=0;
285
286 ssl3_init_finished_mac(s);
287 break;
288
289 case SSL3_ST_SW_HELLO_REQ_C:
290 s->state=SSL_ST_OK;
291 break;
292
293 case SSL3_ST_SR_CLNT_HELLO_A:
294 case SSL3_ST_SR_CLNT_HELLO_B:
295 case SSL3_ST_SR_CLNT_HELLO_C:
296
297 s->shutdown=0;
298 ret=ssl3_get_client_hello(s);
299 if (ret <= 0) goto end;
300 dtls1_stop_timer(s);
301
302 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
303 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
304 else
305 s->state = SSL3_ST_SW_SRVR_HELLO_A;
306
307 s->init_num=0;
308
309 /* Reflect ClientHello sequence to remain stateless while listening */
310 if (listen)
311 {
312 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
313 }
314
315 /* If we're just listening, stop here */
316 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
317 {
318 ret = 2;
319 s->d1->listen = 0;
320 /* Set expected sequence numbers
321 * to continue the handshake.
322 */
323 s->d1->handshake_read_seq = 2;
324 s->d1->handshake_write_seq = 1;
325 s->d1->next_handshake_write_seq = 1;
326 goto end;
327 }
328
329 break;
330
331 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
333
334 ret = dtls1_send_hello_verify_request(s);
335 if ( ret <= 0) goto end;
336 s->state=SSL3_ST_SW_FLUSH;
337 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
338
339 /* HelloVerifyRequest resets Finished MAC */
340 if (s->version != DTLS1_BAD_VER)
341 ssl3_init_finished_mac(s);
342 break;
343
344 #ifndef OPENSSL_NO_SCTP
345 case DTLS1_SCTP_ST_SR_READ_SOCK:
346
347 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
348 {
349 s->s3->in_read_app_data=2;
350 s->rwstate=SSL_READING;
351 BIO_clear_retry_flags(SSL_get_rbio(s));
352 BIO_set_retry_read(SSL_get_rbio(s));
353 ret = -1;
354 goto end;
355 }
356
357 s->state=SSL3_ST_SR_FINISHED_A;
358 break;
359
360 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
361 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
362 if (ret < 0) goto end;
363
364 if (ret == 0)
365 {
366 if (s->d1->next_state != SSL_ST_OK)
367 {
368 s->s3->in_read_app_data=2;
369 s->rwstate=SSL_READING;
370 BIO_clear_retry_flags(SSL_get_rbio(s));
371 BIO_set_retry_read(SSL_get_rbio(s));
372 ret = -1;
373 goto end;
374 }
375 }
376
377 s->state=s->d1->next_state;
378 break;
379 #endif
380
381 case SSL3_ST_SW_SRVR_HELLO_A:
382 case SSL3_ST_SW_SRVR_HELLO_B:
383 s->renegotiate = 2;
384 dtls1_start_timer(s);
385 ret=dtls1_send_server_hello(s);
386 if (ret <= 0) goto end;
387
388 if (s->hit)
389 {
390 #ifndef OPENSSL_NO_SCTP
391 /* Add new shared key for SCTP-Auth,
392 * will be ignored if no SCTP used.
393 */
394 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
395 DTLS1_SCTP_AUTH_LABEL);
396
397 SSL_export_keying_material(s, sctpauthkey,
398 sizeof(sctpauthkey), labelbuffer,
399 sizeof(labelbuffer), NULL, 0, 0);
400
401 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
402 sizeof(sctpauthkey), sctpauthkey);
403 #endif
404 #ifndef OPENSSL_NO_TLSEXT
405 if (s->tlsext_ticket_expected)
406 s->state=SSL3_ST_SW_SESSION_TICKET_A;
407 else
408 s->state=SSL3_ST_SW_CHANGE_A;
409 #else
410 s->state=SSL3_ST_SW_CHANGE_A;
411 #endif
412 }
413 else
414 s->state=SSL3_ST_SW_CERT_A;
415 s->init_num=0;
416 break;
417
418 case SSL3_ST_SW_CERT_A:
419 case SSL3_ST_SW_CERT_B:
420 /* Check if it is anon DH or normal PSK */
421 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
422 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
423 {
424 dtls1_start_timer(s);
425 ret=dtls1_send_server_certificate(s);
426 if (ret <= 0) goto end;
427 #ifndef OPENSSL_NO_TLSEXT
428 if (s->tlsext_status_expected)
429 s->state=SSL3_ST_SW_CERT_STATUS_A;
430 else
431 s->state=SSL3_ST_SW_KEY_EXCH_A;
432 }
433 else
434 {
435 skip = 1;
436 s->state=SSL3_ST_SW_KEY_EXCH_A;
437 }
438 #else
439 }
440 else
441 skip=1;
442
443 s->state=SSL3_ST_SW_KEY_EXCH_A;
444 #endif
445 s->init_num=0;
446 break;
447
448 case SSL3_ST_SW_KEY_EXCH_A:
449 case SSL3_ST_SW_KEY_EXCH_B:
450 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
451
452 /* clear this, it may get reset by
453 * send_server_key_exchange */
454 if ((s->options & SSL_OP_EPHEMERAL_RSA)
455 #ifndef OPENSSL_NO_KRB5
456 && !(alg_k & SSL_kKRB5)
457 #endif /* OPENSSL_NO_KRB5 */
458 )
459 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
460 * even when forbidden by protocol specs
461 * (handshake may fail as clients are not required to
462 * be able to handle this) */
463 s->s3->tmp.use_rsa_tmp=1;
464 else
465 s->s3->tmp.use_rsa_tmp=0;
466
467 /* only send if a DH key exchange or
468 * RSA but we have a sign only certificate */
469 if (s->s3->tmp.use_rsa_tmp
470 /* PSK: send ServerKeyExchange if PSK identity
471 * hint if provided */
472 #ifndef OPENSSL_NO_PSK
473 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
474 #endif
475 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
476 || (alg_k & SSL_kEECDH)
477 || ((alg_k & SSL_kRSA)
478 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
479 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
480 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
481 )
482 )
483 )
484 )
485 {
486 dtls1_start_timer(s);
487 ret=dtls1_send_server_key_exchange(s);
488 if (ret <= 0) goto end;
489 }
490 else
491 skip=1;
492
493 s->state=SSL3_ST_SW_CERT_REQ_A;
494 s->init_num=0;
495 break;
496
497 case SSL3_ST_SW_CERT_REQ_A:
498 case SSL3_ST_SW_CERT_REQ_B:
499 if (/* don't request cert unless asked for it: */
500 !(s->verify_mode & SSL_VERIFY_PEER) ||
501 /* if SSL_VERIFY_CLIENT_ONCE is set,
502 * don't request cert during re-negotiation: */
503 ((s->session->peer != NULL) &&
504 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
505 /* never request cert in anonymous ciphersuites
506 * (see section "Certificate request" in SSL 3 drafts
507 * and in RFC 2246): */
508 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
509 /* ... except when the application insists on verification
510 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
511 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
512 /* never request cert in Kerberos ciphersuites */
513 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
514 /* With normal PSK Certificates and
515 * Certificate Requests are omitted */
516 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
517 {
518 /* no cert request */
519 skip=1;
520 s->s3->tmp.cert_request=0;
521 s->state=SSL3_ST_SW_SRVR_DONE_A;
522 #ifndef OPENSSL_NO_SCTP
523 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
524 {
525 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
526 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
527 }
528 #endif
529 }
530 else
531 {
532 s->s3->tmp.cert_request=1;
533 dtls1_start_timer(s);
534 ret=dtls1_send_certificate_request(s);
535 if (ret <= 0) goto end;
536 #ifndef NETSCAPE_HANG_BUG
537 s->state=SSL3_ST_SW_SRVR_DONE_A;
538 #ifndef OPENSSL_NO_SCTP
539 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
540 {
541 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
542 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
543 }
544 #endif
545 #else
546 s->state=SSL3_ST_SW_FLUSH;
547 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
548 #ifndef OPENSSL_NO_SCTP
549 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
550 {
551 s->d1->next_state = s->s3->tmp.next_state;
552 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
553 }
554 #endif
555 #endif
556 s->init_num=0;
557 }
558 break;
559
560 case SSL3_ST_SW_SRVR_DONE_A:
561 case SSL3_ST_SW_SRVR_DONE_B:
562 dtls1_start_timer(s);
563 ret=dtls1_send_server_done(s);
564 if (ret <= 0) goto end;
565 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
566 s->state=SSL3_ST_SW_FLUSH;
567 s->init_num=0;
568 break;
569
570 case SSL3_ST_SW_FLUSH:
571 s->rwstate=SSL_WRITING;
572 if (BIO_flush(s->wbio) <= 0)
573 {
574 /* If the write error was fatal, stop trying */
575 if (!BIO_should_retry(s->wbio))
576 {
577 s->rwstate=SSL_NOTHING;
578 s->state=s->s3->tmp.next_state;
579 }
580
581 ret= -1;
582 goto end;
583 }
584 s->rwstate=SSL_NOTHING;
585 s->state=s->s3->tmp.next_state;
586 break;
587
588 case SSL3_ST_SR_CERT_A:
589 case SSL3_ST_SR_CERT_B:
590 /* Check for second client hello (MS SGC) */
591 ret = ssl3_check_client_hello(s);
592 if (ret <= 0)
593 goto end;
594 dtls1_stop_timer(s);
595 if (ret == 2)
596 s->state = SSL3_ST_SR_CLNT_HELLO_C;
597 else {
598 /* could be sent for a DH cert, even if we
599 * have not asked for it :-) */
600 ret=ssl3_get_client_certificate(s);
601 if (ret <= 0) goto end;
602 dtls1_stop_timer(s);
603 s->init_num=0;
604 s->state=SSL3_ST_SR_KEY_EXCH_A;
605 }
606 break;
607
608 case SSL3_ST_SR_KEY_EXCH_A:
609 case SSL3_ST_SR_KEY_EXCH_B:
610 ret=ssl3_get_client_key_exchange(s);
611 if (ret <= 0) goto end;
612 dtls1_stop_timer(s);
613 #ifndef OPENSSL_NO_SCTP
614 /* Add new shared key for SCTP-Auth,
615 * will be ignored if no SCTP used.
616 */
617 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
618 DTLS1_SCTP_AUTH_LABEL);
619
620 SSL_export_keying_material(s, sctpauthkey,
621 sizeof(sctpauthkey), labelbuffer,
622 sizeof(labelbuffer), NULL, 0, 0);
623
624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
625 sizeof(sctpauthkey), sctpauthkey);
626 #endif
627
628 s->state=SSL3_ST_SR_CERT_VRFY_A;
629 s->init_num=0;
630
631 if (ret == 2)
632 {
633 /* For the ECDH ciphersuites when
634 * the client sends its ECDH pub key in
635 * a certificate, the CertificateVerify
636 * message is not sent.
637 */
638 s->state=SSL3_ST_SR_FINISHED_A;
639 s->init_num = 0;
640 }
641 else
642 {
643 s->state=SSL3_ST_SR_CERT_VRFY_A;
644 s->init_num=0;
645
646 /* We need to get hashes here so if there is
647 * a client cert, it can be verified */
648 s->method->ssl3_enc->cert_verify_mac(s,
649 NID_md5,
650 &(s->s3->tmp.cert_verify_md[0]));
651 s->method->ssl3_enc->cert_verify_mac(s,
652 NID_sha1,
653 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
654 }
655 break;
656
657 case SSL3_ST_SR_CERT_VRFY_A:
658 case SSL3_ST_SR_CERT_VRFY_B:
659
660 s->d1->change_cipher_spec_ok = 1;
661 /* we should decide if we expected this one */
662 ret=ssl3_get_cert_verify(s);
663 if (ret <= 0) goto end;
664 dtls1_stop_timer(s);
665 #ifndef OPENSSL_NO_SCTP
666 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
667 state == SSL_ST_RENEGOTIATE)
668 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
669 else
670 #endif
671 s->state=SSL3_ST_SR_FINISHED_A;
672 s->init_num=0;
673 break;
674
675 case SSL3_ST_SR_FINISHED_A:
676 case SSL3_ST_SR_FINISHED_B:
677 s->d1->change_cipher_spec_ok = 1;
678 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
679 SSL3_ST_SR_FINISHED_B);
680 if (ret <= 0) goto end;
681 dtls1_stop_timer(s);
682 if (s->hit)
683 s->state=SSL_ST_OK;
684 #ifndef OPENSSL_NO_TLSEXT
685 else if (s->tlsext_ticket_expected)
686 s->state=SSL3_ST_SW_SESSION_TICKET_A;
687 #endif
688 else
689 s->state=SSL3_ST_SW_CHANGE_A;
690 s->init_num=0;
691 break;
692
693 #ifndef OPENSSL_NO_TLSEXT
694 case SSL3_ST_SW_SESSION_TICKET_A:
695 case SSL3_ST_SW_SESSION_TICKET_B:
696 ret=dtls1_send_newsession_ticket(s);
697 if (ret <= 0) goto end;
698 s->state=SSL3_ST_SW_CHANGE_A;
699 s->init_num=0;
700 break;
701
702 case SSL3_ST_SW_CERT_STATUS_A:
703 case SSL3_ST_SW_CERT_STATUS_B:
704 ret=ssl3_send_cert_status(s);
705 if (ret <= 0) goto end;
706 s->state=SSL3_ST_SW_KEY_EXCH_A;
707 s->init_num=0;
708 break;
709
710 #endif
711
712 case SSL3_ST_SW_CHANGE_A:
713 case SSL3_ST_SW_CHANGE_B:
714
715 s->session->cipher=s->s3->tmp.new_cipher;
716 if (!s->method->ssl3_enc->setup_key_block(s))
717 { ret= -1; goto end; }
718
719 ret=dtls1_send_change_cipher_spec(s,
720 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
721
722 if (ret <= 0) goto end;
723
724 #ifndef OPENSSL_NO_SCTP
725 /* Change to new shared key of SCTP-Auth,
726 * will be ignored if no SCTP used.
727 */
728 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
729 #endif
730
731 s->state=SSL3_ST_SW_FINISHED_A;
732 s->init_num=0;
733
734 if (!s->method->ssl3_enc->change_cipher_state(s,
735 SSL3_CHANGE_CIPHER_SERVER_WRITE))
736 {
737 ret= -1;
738 goto end;
739 }
740
741 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
742 break;
743
744 case SSL3_ST_SW_FINISHED_A:
745 case SSL3_ST_SW_FINISHED_B:
746 ret=dtls1_send_finished(s,
747 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
748 s->method->ssl3_enc->server_finished_label,
749 s->method->ssl3_enc->server_finished_label_len);
750 if (ret <= 0) goto end;
751 s->state=SSL3_ST_SW_FLUSH;
752 if (s->hit)
753 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
754 else
755 {
756 s->s3->tmp.next_state=SSL_ST_OK;
757 #ifndef OPENSSL_NO_SCTP
758 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
759 {
760 s->d1->next_state = s->s3->tmp.next_state;
761 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
762 }
763 #endif
764 }
765 s->init_num=0;
766 break;
767
768 case SSL_ST_OK:
769 /* clean a few things up */
770 ssl3_cleanup_key_block(s);
771
772 #if 0
773 BUF_MEM_free(s->init_buf);
774 s->init_buf=NULL;
775 #endif
776
777 /* remove buffering on output */
778 ssl_free_wbio_buffer(s);
779
780 s->init_num=0;
781
782 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
783 {
784 s->renegotiate=0;
785 s->new_session=0;
786
787 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
788
789 s->ctx->stats.sess_accept_good++;
790 /* s->server=1; */
791 s->handshake_func=dtls1_accept;
792
793 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
794 }
795
796 ret = 1;
797
798 /* done handshaking, next message is client hello */
799 s->d1->handshake_read_seq = 0;
800 /* next message is server hello */
801 s->d1->handshake_write_seq = 0;
802 s->d1->next_handshake_write_seq = 0;
803 goto end;
804 /* break; */
805
806 default:
807 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
808 ret= -1;
809 goto end;
810 /* break; */
811 }
812
813 if (!s->s3->tmp.reuse_message && !skip)
814 {
815 if (s->debug)
816 {
817 if ((ret=BIO_flush(s->wbio)) <= 0)
818 goto end;
819 }
820
821
822 if ((cb != NULL) && (s->state != state))
823 {
824 new_state=s->state;
825 s->state=state;
826 cb(s,SSL_CB_ACCEPT_LOOP,1);
827 s->state=new_state;
828 }
829 }
830 skip=0;
831 }
832 end:
833 /* BIO_flush(s->wbio); */
834
835 s->in_handshake--;
836 #ifndef OPENSSL_NO_SCTP
837 /* Notify SCTP BIO socket to leave handshake
838 * mode and prevent stream identifier other
839 * than 0. Will be ignored if no SCTP is used.
840 */
841 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
842 #endif
843
844 if (cb != NULL)
845 cb(s,SSL_CB_ACCEPT_EXIT,ret);
846 return(ret);
847 }
848
849 int dtls1_send_hello_request(SSL *s)
850 {
851 unsigned char *p;
852
853 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
854 {
855 p=(unsigned char *)s->init_buf->data;
856 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
857
858 s->state=SSL3_ST_SW_HELLO_REQ_B;
859 /* number of bytes to write */
860 s->init_num=DTLS1_HM_HEADER_LENGTH;
861 s->init_off=0;
862
863 /* no need to buffer this message, since there are no retransmit
864 * requests for it */
865 }
866
867 /* SSL3_ST_SW_HELLO_REQ_B */
868 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
869 }
870
871 int dtls1_send_hello_verify_request(SSL *s)
872 {
873 unsigned int msg_len;
874 unsigned char *msg, *buf, *p;
875
876 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
877 {
878 buf = (unsigned char *)s->init_buf->data;
879
880 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
881 *(p++) = s->version >> 8;
882 *(p++) = s->version & 0xFF;
883
884 if (s->ctx->app_gen_cookie_cb == NULL ||
885 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
886 &(s->d1->cookie_len)) == 0)
887 {
888 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
889 return 0;
890 }
891
892 *(p++) = (unsigned char) s->d1->cookie_len;
893 memcpy(p, s->d1->cookie, s->d1->cookie_len);
894 p += s->d1->cookie_len;
895 msg_len = p - msg;
896
897 dtls1_set_message_header(s, buf,
898 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
899
900 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
901 /* number of bytes to write */
902 s->init_num=p-buf;
903 s->init_off=0;
904 }
905
906 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
907 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
908 }
909
910 int dtls1_send_server_hello(SSL *s)
911 {
912 unsigned char *buf;
913 unsigned char *p,*d;
914 int i;
915 unsigned int sl;
916 unsigned long l,Time;
917
918 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
919 {
920 buf=(unsigned char *)s->init_buf->data;
921 p=s->s3->server_random;
922 Time=(unsigned long)time(NULL); /* Time */
923 l2n(Time,p);
924 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
925 /* Do the message type and length last */
926 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
927
928 *(p++)=s->version>>8;
929 *(p++)=s->version&0xff;
930
931 /* Random stuff */
932 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
933 p+=SSL3_RANDOM_SIZE;
934
935 /* now in theory we have 3 options to sending back the
936 * session id. If it is a re-use, we send back the
937 * old session-id, if it is a new session, we send
938 * back the new session-id or we send back a 0 length
939 * session-id if we want it to be single use.
940 * Currently I will not implement the '0' length session-id
941 * 12-Jan-98 - I'll now support the '0' length stuff.
942 */
943 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
944 s->session->session_id_length=0;
945
946 sl=s->session->session_id_length;
947 if (sl > sizeof s->session->session_id)
948 {
949 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
950 return -1;
951 }
952 *(p++)=sl;
953 memcpy(p,s->session->session_id,sl);
954 p+=sl;
955
956 /* put the cipher */
957 if (s->s3->tmp.new_cipher == NULL)
958 return -1;
959 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
960 p+=i;
961
962 /* put the compression method */
963 #ifdef OPENSSL_NO_COMP
964 *(p++)=0;
965 #else
966 if (s->s3->tmp.new_compression == NULL)
967 *(p++)=0;
968 else
969 *(p++)=s->s3->tmp.new_compression->id;
970 #endif
971
972 #ifndef OPENSSL_NO_TLSEXT
973 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
974 {
975 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
976 return -1;
977 }
978 #endif
979
980 /* do the header */
981 l=(p-d);
982 d=buf;
983
984 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
985
986 s->state=SSL3_ST_SW_SRVR_HELLO_B;
987 /* number of bytes to write */
988 s->init_num=p-buf;
989 s->init_off=0;
990
991 /* buffer the message to handle re-xmits */
992 dtls1_buffer_message(s, 0);
993 }
994
995 /* SSL3_ST_SW_SRVR_HELLO_B */
996 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
997 }
998
999 int dtls1_send_server_done(SSL *s)
1000 {
1001 unsigned char *p;
1002
1003 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1004 {
1005 p=(unsigned char *)s->init_buf->data;
1006
1007 /* do the header */
1008 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1009
1010 s->state=SSL3_ST_SW_SRVR_DONE_B;
1011 /* number of bytes to write */
1012 s->init_num=DTLS1_HM_HEADER_LENGTH;
1013 s->init_off=0;
1014
1015 /* buffer the message to handle re-xmits */
1016 dtls1_buffer_message(s, 0);
1017 }
1018
1019 /* SSL3_ST_SW_SRVR_DONE_B */
1020 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1021 }
1022
1023 int dtls1_send_server_key_exchange(SSL *s)
1024 {
1025 #ifndef OPENSSL_NO_RSA
1026 unsigned char *q;
1027 int j,num;
1028 RSA *rsa;
1029 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1030 unsigned int u;
1031 #endif
1032 #ifndef OPENSSL_NO_DH
1033 DH *dh=NULL,*dhp;
1034 #endif
1035 #ifndef OPENSSL_NO_ECDH
1036 EC_KEY *ecdh=NULL, *ecdhp;
1037 unsigned char *encodedPoint = NULL;
1038 int encodedlen = 0;
1039 int curve_id = 0;
1040 BN_CTX *bn_ctx = NULL;
1041 #endif
1042 EVP_PKEY *pkey;
1043 unsigned char *p,*d;
1044 int al,i;
1045 unsigned long type;
1046 int n;
1047 CERT *cert;
1048 BIGNUM *r[4];
1049 int nr[4],kn;
1050 BUF_MEM *buf;
1051 EVP_MD_CTX md_ctx;
1052
1053 EVP_MD_CTX_init(&md_ctx);
1054 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1055 {
1056 type=s->s3->tmp.new_cipher->algorithm_mkey;
1057 cert=s->cert;
1058
1059 buf=s->init_buf;
1060
1061 r[0]=r[1]=r[2]=r[3]=NULL;
1062 n=0;
1063 #ifndef OPENSSL_NO_RSA
1064 if (type & SSL_kRSA)
1065 {
1066 rsa=cert->rsa_tmp;
1067 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1068 {
1069 rsa=s->cert->rsa_tmp_cb(s,
1070 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1071 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1072 if(rsa == NULL)
1073 {
1074 al=SSL_AD_HANDSHAKE_FAILURE;
1075 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1076 goto f_err;
1077 }
1078 RSA_up_ref(rsa);
1079 cert->rsa_tmp=rsa;
1080 }
1081 if (rsa == NULL)
1082 {
1083 al=SSL_AD_HANDSHAKE_FAILURE;
1084 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1085 goto f_err;
1086 }
1087 r[0]=rsa->n;
1088 r[1]=rsa->e;
1089 s->s3->tmp.use_rsa_tmp=1;
1090 }
1091 else
1092 #endif
1093 #ifndef OPENSSL_NO_DH
1094 if (type & SSL_kEDH)
1095 {
1096 dhp=cert->dh_tmp;
1097 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1098 dhp=s->cert->dh_tmp_cb(s,
1099 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1100 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1101 if (dhp == NULL)
1102 {
1103 al=SSL_AD_HANDSHAKE_FAILURE;
1104 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1105 goto f_err;
1106 }
1107
1108 if (s->s3->tmp.dh != NULL)
1109 {
1110 DH_free(dh);
1111 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1112 goto err;
1113 }
1114
1115 if ((dh=DHparams_dup(dhp)) == NULL)
1116 {
1117 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1118 goto err;
1119 }
1120
1121 s->s3->tmp.dh=dh;
1122 if ((dhp->pub_key == NULL ||
1123 dhp->priv_key == NULL ||
1124 (s->options & SSL_OP_SINGLE_DH_USE)))
1125 {
1126 if(!DH_generate_key(dh))
1127 {
1128 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1129 ERR_R_DH_LIB);
1130 goto err;
1131 }
1132 }
1133 else
1134 {
1135 dh->pub_key=BN_dup(dhp->pub_key);
1136 dh->priv_key=BN_dup(dhp->priv_key);
1137 if ((dh->pub_key == NULL) ||
1138 (dh->priv_key == NULL))
1139 {
1140 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1141 goto err;
1142 }
1143 }
1144 r[0]=dh->p;
1145 r[1]=dh->g;
1146 r[2]=dh->pub_key;
1147 }
1148 else
1149 #endif
1150 #ifndef OPENSSL_NO_ECDH
1151 if (type & SSL_kEECDH)
1152 {
1153 const EC_GROUP *group;
1154
1155 ecdhp=cert->ecdh_tmp;
1156 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1157 {
1158 ecdhp=s->cert->ecdh_tmp_cb(s,
1159 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1160 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1161 }
1162 if (ecdhp == NULL)
1163 {
1164 al=SSL_AD_HANDSHAKE_FAILURE;
1165 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1166 goto f_err;
1167 }
1168
1169 if (s->s3->tmp.ecdh != NULL)
1170 {
1171 EC_KEY_free(s->s3->tmp.ecdh);
1172 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1173 goto err;
1174 }
1175
1176 /* Duplicate the ECDH structure. */
1177 if (ecdhp == NULL)
1178 {
1179 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1180 goto err;
1181 }
1182 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1183 {
1184 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1185 goto err;
1186 }
1187
1188 s->s3->tmp.ecdh=ecdh;
1189 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1190 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1191 (s->options & SSL_OP_SINGLE_ECDH_USE))
1192 {
1193 if(!EC_KEY_generate_key(ecdh))
1194 {
1195 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1196 goto err;
1197 }
1198 }
1199
1200 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1201 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1202 (EC_KEY_get0_private_key(ecdh) == NULL))
1203 {
1204 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1205 goto err;
1206 }
1207
1208 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1209 (EC_GROUP_get_degree(group) > 163))
1210 {
1211 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1212 goto err;
1213 }
1214
1215 /* XXX: For now, we only support ephemeral ECDH
1216 * keys over named (not generic) curves. For
1217 * supported named curves, curve_id is non-zero.
1218 */
1219 if ((curve_id =
1220 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1221 == 0)
1222 {
1223 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1224 goto err;
1225 }
1226
1227 /* Encode the public key.
1228 * First check the size of encoding and
1229 * allocate memory accordingly.
1230 */
1231 encodedlen = EC_POINT_point2oct(group,
1232 EC_KEY_get0_public_key(ecdh),
1233 POINT_CONVERSION_UNCOMPRESSED,
1234 NULL, 0, NULL);
1235
1236 encodedPoint = (unsigned char *)
1237 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1238 bn_ctx = BN_CTX_new();
1239 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1240 {
1241 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1242 goto err;
1243 }
1244
1245
1246 encodedlen = EC_POINT_point2oct(group,
1247 EC_KEY_get0_public_key(ecdh),
1248 POINT_CONVERSION_UNCOMPRESSED,
1249 encodedPoint, encodedlen, bn_ctx);
1250
1251 if (encodedlen == 0)
1252 {
1253 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1254 goto err;
1255 }
1256
1257 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1258
1259 /* XXX: For now, we only support named (not
1260 * generic) curves in ECDH ephemeral key exchanges.
1261 * In this situation, we need four additional bytes
1262 * to encode the entire ServerECDHParams
1263 * structure.
1264 */
1265 n = 4 + encodedlen;
1266
1267 /* We'll generate the serverKeyExchange message
1268 * explicitly so we can set these to NULLs
1269 */
1270 r[0]=NULL;
1271 r[1]=NULL;
1272 r[2]=NULL;
1273 r[3]=NULL;
1274 }
1275 else
1276 #endif /* !OPENSSL_NO_ECDH */
1277 #ifndef OPENSSL_NO_PSK
1278 if (type & SSL_kPSK)
1279 {
1280 /* reserve size for record length and PSK identity hint*/
1281 n+=2+strlen(s->ctx->psk_identity_hint);
1282 }
1283 else
1284 #endif /* !OPENSSL_NO_PSK */
1285 {
1286 al=SSL_AD_HANDSHAKE_FAILURE;
1287 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1288 goto f_err;
1289 }
1290 for (i=0; r[i] != NULL; i++)
1291 {
1292 nr[i]=BN_num_bytes(r[i]);
1293 n+=2+nr[i];
1294 }
1295
1296 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1297 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1298 {
1299 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1300 == NULL)
1301 {
1302 al=SSL_AD_DECODE_ERROR;
1303 goto f_err;
1304 }
1305 kn=EVP_PKEY_size(pkey);
1306 }
1307 else
1308 {
1309 pkey=NULL;
1310 kn=0;
1311 }
1312
1313 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1314 {
1315 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1316 goto err;
1317 }
1318 d=(unsigned char *)s->init_buf->data;
1319 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1320
1321 for (i=0; r[i] != NULL; i++)
1322 {
1323 s2n(nr[i],p);
1324 BN_bn2bin(r[i],p);
1325 p+=nr[i];
1326 }
1327
1328 #ifndef OPENSSL_NO_ECDH
1329 if (type & SSL_kEECDH)
1330 {
1331 /* XXX: For now, we only support named (not generic) curves.
1332 * In this situation, the serverKeyExchange message has:
1333 * [1 byte CurveType], [2 byte CurveName]
1334 * [1 byte length of encoded point], followed by
1335 * the actual encoded point itself
1336 */
1337 *p = NAMED_CURVE_TYPE;
1338 p += 1;
1339 *p = 0;
1340 p += 1;
1341 *p = curve_id;
1342 p += 1;
1343 *p = encodedlen;
1344 p += 1;
1345 memcpy((unsigned char*)p,
1346 (unsigned char *)encodedPoint,
1347 encodedlen);
1348 OPENSSL_free(encodedPoint);
1349 p += encodedlen;
1350 }
1351 #endif
1352
1353 #ifndef OPENSSL_NO_PSK
1354 if (type & SSL_kPSK)
1355 {
1356 /* copy PSK identity hint */
1357 s2n(strlen(s->ctx->psk_identity_hint), p);
1358 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1359 p+=strlen(s->ctx->psk_identity_hint);
1360 }
1361 #endif
1362
1363 /* not anonymous */
1364 if (pkey != NULL)
1365 {
1366 /* n is the length of the params, they start at
1367 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1368 * at the end. */
1369 #ifndef OPENSSL_NO_RSA
1370 if (pkey->type == EVP_PKEY_RSA)
1371 {
1372 q=md_buf;
1373 j=0;
1374 for (num=2; num > 0; num--)
1375 {
1376 EVP_DigestInit_ex(&md_ctx,(num == 2)
1377 ?s->ctx->md5:s->ctx->sha1, NULL);
1378 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1379 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1380 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1381 EVP_DigestFinal_ex(&md_ctx,q,
1382 (unsigned int *)&i);
1383 q+=i;
1384 j+=i;
1385 }
1386 if (RSA_sign(NID_md5_sha1, md_buf, j,
1387 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1388 {
1389 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1390 goto err;
1391 }
1392 s2n(u,p);
1393 n+=u+2;
1394 }
1395 else
1396 #endif
1397 #if !defined(OPENSSL_NO_DSA)
1398 if (pkey->type == EVP_PKEY_DSA)
1399 {
1400 /* lets do DSS */
1401 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1402 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1403 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1404 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1405 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1406 (unsigned int *)&i,pkey))
1407 {
1408 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1409 goto err;
1410 }
1411 s2n(i,p);
1412 n+=i+2;
1413 }
1414 else
1415 #endif
1416 #if !defined(OPENSSL_NO_ECDSA)
1417 if (pkey->type == EVP_PKEY_EC)
1418 {
1419 /* let's do ECDSA */
1420 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1421 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1422 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1423 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1424 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1425 (unsigned int *)&i,pkey))
1426 {
1427 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1428 goto err;
1429 }
1430 s2n(i,p);
1431 n+=i+2;
1432 }
1433 else
1434 #endif
1435 {
1436 /* Is this error check actually needed? */
1437 al=SSL_AD_HANDSHAKE_FAILURE;
1438 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1439 goto f_err;
1440 }
1441 }
1442
1443 d = dtls1_set_message_header(s, d,
1444 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1445
1446 /* we should now have things packed up, so lets send
1447 * it off */
1448 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1449 s->init_off=0;
1450
1451 /* buffer the message to handle re-xmits */
1452 dtls1_buffer_message(s, 0);
1453 }
1454
1455 s->state = SSL3_ST_SW_KEY_EXCH_B;
1456 EVP_MD_CTX_cleanup(&md_ctx);
1457 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1458 f_err:
1459 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1460 err:
1461 #ifndef OPENSSL_NO_ECDH
1462 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1463 BN_CTX_free(bn_ctx);
1464 #endif
1465 EVP_MD_CTX_cleanup(&md_ctx);
1466 return(-1);
1467 }
1468
1469 int dtls1_send_certificate_request(SSL *s)
1470 {
1471 unsigned char *p,*d;
1472 int i,j,nl,off,n;
1473 STACK_OF(X509_NAME) *sk=NULL;
1474 X509_NAME *name;
1475 BUF_MEM *buf;
1476 unsigned int msg_len;
1477
1478 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1479 {
1480 buf=s->init_buf;
1481
1482 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1483
1484 /* get the list of acceptable cert types */
1485 p++;
1486 n=ssl3_get_req_cert_type(s,p);
1487 d[0]=n;
1488 p+=n;
1489 n++;
1490
1491 off=n;
1492 p+=2;
1493 n+=2;
1494
1495 sk=SSL_get_client_CA_list(s);
1496 nl=0;
1497 if (sk != NULL)
1498 {
1499 for (i=0; i<sk_X509_NAME_num(sk); i++)
1500 {
1501 name=sk_X509_NAME_value(sk,i);
1502 j=i2d_X509_NAME(name,NULL);
1503 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1504 {
1505 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1506 goto err;
1507 }
1508 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1509 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1510 {
1511 s2n(j,p);
1512 i2d_X509_NAME(name,&p);
1513 n+=2+j;
1514 nl+=2+j;
1515 }
1516 else
1517 {
1518 d=p;
1519 i2d_X509_NAME(name,&p);
1520 j-=2; s2n(j,d); j+=2;
1521 n+=j;
1522 nl+=j;
1523 }
1524 }
1525 }
1526 /* else no CA names */
1527 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1528 s2n(nl,p);
1529
1530 d=(unsigned char *)buf->data;
1531 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1532 l2n3(n,d);
1533 s2n(s->d1->handshake_write_seq,d);
1534 s->d1->handshake_write_seq++;
1535
1536 /* we should now have things packed up, so lets send
1537 * it off */
1538
1539 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1540 s->init_off=0;
1541 #ifdef NETSCAPE_HANG_BUG
1542 /* XXX: what to do about this? */
1543 p=(unsigned char *)s->init_buf->data + s->init_num;
1544
1545 /* do the header */
1546 *(p++)=SSL3_MT_SERVER_DONE;
1547 *(p++)=0;
1548 *(p++)=0;
1549 *(p++)=0;
1550 s->init_num += 4;
1551 #endif
1552
1553 /* XDTLS: set message header ? */
1554 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1555 dtls1_set_message_header(s, (void *)s->init_buf->data,
1556 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1557
1558 /* buffer the message to handle re-xmits */
1559 dtls1_buffer_message(s, 0);
1560
1561 s->state = SSL3_ST_SW_CERT_REQ_B;
1562 }
1563
1564 /* SSL3_ST_SW_CERT_REQ_B */
1565 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1566 err:
1567 return(-1);
1568 }
1569
1570 int dtls1_send_server_certificate(SSL *s)
1571 {
1572 unsigned long l;
1573 X509 *x;
1574
1575 if (s->state == SSL3_ST_SW_CERT_A)
1576 {
1577 x=ssl_get_server_send_cert(s);
1578 if (x == NULL)
1579 {
1580 /* VRS: allow null cert if auth == KRB5 */
1581 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1582 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1583 {
1584 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1585 return(0);
1586 }
1587 }
1588
1589 l=dtls1_output_cert_chain(s,x);
1590 s->state=SSL3_ST_SW_CERT_B;
1591 s->init_num=(int)l;
1592 s->init_off=0;
1593
1594 /* buffer the message to handle re-xmits */
1595 dtls1_buffer_message(s, 0);
1596 }
1597
1598 /* SSL3_ST_SW_CERT_B */
1599 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1600 }
1601
1602 #ifndef OPENSSL_NO_TLSEXT
1603 int dtls1_send_newsession_ticket(SSL *s)
1604 {
1605 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1606 {
1607 unsigned char *p, *senc, *macstart;
1608 int len, slen;
1609 unsigned int hlen, msg_len;
1610 EVP_CIPHER_CTX ctx;
1611 HMAC_CTX hctx;
1612 SSL_CTX *tctx = s->initial_ctx;
1613 unsigned char iv[EVP_MAX_IV_LENGTH];
1614 unsigned char key_name[16];
1615
1616 /* get session encoding length */
1617 slen = i2d_SSL_SESSION(s->session, NULL);
1618 /* Some length values are 16 bits, so forget it if session is
1619 * too long
1620 */
1621 if (slen > 0xFF00)
1622 return -1;
1623 /* Grow buffer if need be: the length calculation is as
1624 * follows 12 (DTLS handshake message header) +
1625 * 4 (ticket lifetime hint) + 2 (ticket length) +
1626 * 16 (key name) + max_iv_len (iv length) +
1627 * session_length + max_enc_block_size (max encrypted session
1628 * length) + max_md_size (HMAC).
1629 */
1630 if (!BUF_MEM_grow(s->init_buf,
1631 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1632 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1633 return -1;
1634 senc = OPENSSL_malloc(slen);
1635 if (!senc)
1636 return -1;
1637 p = senc;
1638 i2d_SSL_SESSION(s->session, &p);
1639
1640 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1641 EVP_CIPHER_CTX_init(&ctx);
1642 HMAC_CTX_init(&hctx);
1643 /* Initialize HMAC and cipher contexts. If callback present
1644 * it does all the work otherwise use generated values
1645 * from parent ctx.
1646 */
1647 if (tctx->tlsext_ticket_key_cb)
1648 {
1649 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1650 &hctx, 1) < 0)
1651 {
1652 OPENSSL_free(senc);
1653 return -1;
1654 }
1655 }
1656 else
1657 {
1658 RAND_pseudo_bytes(iv, 16);
1659 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1660 tctx->tlsext_tick_aes_key, iv);
1661 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1662 tlsext_tick_md(), NULL);
1663 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1664 }
1665 l2n(s->session->tlsext_tick_lifetime_hint, p);
1666 /* Skip ticket length for now */
1667 p += 2;
1668 /* Output key name */
1669 macstart = p;
1670 memcpy(p, key_name, 16);
1671 p += 16;
1672 /* output IV */
1673 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1674 p += EVP_CIPHER_CTX_iv_length(&ctx);
1675 /* Encrypt session data */
1676 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1677 p += len;
1678 EVP_EncryptFinal(&ctx, p, &len);
1679 p += len;
1680 EVP_CIPHER_CTX_cleanup(&ctx);
1681
1682 HMAC_Update(&hctx, macstart, p - macstart);
1683 HMAC_Final(&hctx, p, &hlen);
1684 HMAC_CTX_cleanup(&hctx);
1685
1686 p += hlen;
1687 /* Now write out lengths: p points to end of data written */
1688 /* Total length */
1689 len = p - (unsigned char *)(s->init_buf->data);
1690 /* Ticket length */
1691 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1692 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1693
1694 /* number of bytes to write */
1695 s->init_num= len;
1696 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1697 s->init_off=0;
1698 OPENSSL_free(senc);
1699
1700 /* XDTLS: set message header ? */
1701 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1702 dtls1_set_message_header(s, (void *)s->init_buf->data,
1703 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1704
1705 /* buffer the message to handle re-xmits */
1706 dtls1_buffer_message(s, 0);
1707 }
1708
1709 /* SSL3_ST_SW_SESSION_TICKET_B */
1710 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1711 }
1712 #endif
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