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_clear_record_buffer(s);
280 dtls1_start_timer(s);
281 ret=dtls1_send_hello_request(s);
282 if (ret <= 0) goto end;
283 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
284 s->state=SSL3_ST_SW_FLUSH;
285 s->init_num=0;
286
287 ssl3_init_finished_mac(s);
288 break;
289
290 case SSL3_ST_SW_HELLO_REQ_C:
291 s->state=SSL_ST_OK;
292 break;
293
294 case SSL3_ST_SR_CLNT_HELLO_A:
295 case SSL3_ST_SR_CLNT_HELLO_B:
296 case SSL3_ST_SR_CLNT_HELLO_C:
297
298 s->shutdown=0;
299 ret=ssl3_get_client_hello(s);
300 if (ret <= 0) goto end;
301 dtls1_stop_timer(s);
302
303 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
304 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
305 else
306 s->state = SSL3_ST_SW_SRVR_HELLO_A;
307
308 s->init_num=0;
309
310 /* Reflect ClientHello sequence to remain stateless while listening */
311 if (listen)
312 {
313 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
314 }
315
316 /* If we're just listening, stop here */
317 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
318 {
319 ret = 2;
320 s->d1->listen = 0;
321 /* Set expected sequence numbers
322 * to continue the handshake.
323 */
324 s->d1->handshake_read_seq = 2;
325 s->d1->handshake_write_seq = 1;
326 s->d1->next_handshake_write_seq = 1;
327 goto end;
328 }
329
330 break;
331
332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
333 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
334
335 ret = dtls1_send_hello_verify_request(s);
336 if ( ret <= 0) goto end;
337 s->state=SSL3_ST_SW_FLUSH;
338 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
339
340 /* HelloVerifyRequest resets Finished MAC */
341 if (s->version != DTLS1_BAD_VER)
342 ssl3_init_finished_mac(s);
343 break;
344
345 #ifndef OPENSSL_NO_SCTP
346 case DTLS1_SCTP_ST_SR_READ_SOCK:
347
348 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
349 {
350 s->s3->in_read_app_data=2;
351 s->rwstate=SSL_READING;
352 BIO_clear_retry_flags(SSL_get_rbio(s));
353 BIO_set_retry_read(SSL_get_rbio(s));
354 ret = -1;
355 goto end;
356 }
357
358 s->state=SSL3_ST_SR_FINISHED_A;
359 break;
360
361 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
362 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
363 if (ret < 0) goto end;
364
365 if (ret == 0)
366 {
367 if (s->d1->next_state != SSL_ST_OK)
368 {
369 s->s3->in_read_app_data=2;
370 s->rwstate=SSL_READING;
371 BIO_clear_retry_flags(SSL_get_rbio(s));
372 BIO_set_retry_read(SSL_get_rbio(s));
373 ret = -1;
374 goto end;
375 }
376 }
377
378 s->state=s->d1->next_state;
379 break;
380 #endif
381
382 case SSL3_ST_SW_SRVR_HELLO_A:
383 case SSL3_ST_SW_SRVR_HELLO_B:
384 s->renegotiate = 2;
385 dtls1_start_timer(s);
386 ret=dtls1_send_server_hello(s);
387 if (ret <= 0) goto end;
388
389 if (s->hit)
390 {
391 #ifndef OPENSSL_NO_SCTP
392 /* Add new shared key for SCTP-Auth,
393 * will be ignored if no SCTP used.
394 */
395 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
396 DTLS1_SCTP_AUTH_LABEL);
397
398 SSL_export_keying_material(s, sctpauthkey,
399 sizeof(sctpauthkey), labelbuffer,
400 sizeof(labelbuffer), NULL, 0, 0);
401
402 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
403 sizeof(sctpauthkey), sctpauthkey);
404 #endif
405 #ifndef OPENSSL_NO_TLSEXT
406 if (s->tlsext_ticket_expected)
407 s->state=SSL3_ST_SW_SESSION_TICKET_A;
408 else
409 s->state=SSL3_ST_SW_CHANGE_A;
410 #else
411 s->state=SSL3_ST_SW_CHANGE_A;
412 #endif
413 }
414 else
415 s->state=SSL3_ST_SW_CERT_A;
416 s->init_num=0;
417 break;
418
419 case SSL3_ST_SW_CERT_A:
420 case SSL3_ST_SW_CERT_B:
421 /* Check if it is anon DH or normal PSK */
422 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
423 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
424 {
425 dtls1_start_timer(s);
426 ret=dtls1_send_server_certificate(s);
427 if (ret <= 0) goto end;
428 #ifndef OPENSSL_NO_TLSEXT
429 if (s->tlsext_status_expected)
430 s->state=SSL3_ST_SW_CERT_STATUS_A;
431 else
432 s->state=SSL3_ST_SW_KEY_EXCH_A;
433 }
434 else
435 {
436 skip = 1;
437 s->state=SSL3_ST_SW_KEY_EXCH_A;
438 }
439 #else
440 }
441 else
442 skip=1;
443
444 s->state=SSL3_ST_SW_KEY_EXCH_A;
445 #endif
446 s->init_num=0;
447 break;
448
449 case SSL3_ST_SW_KEY_EXCH_A:
450 case SSL3_ST_SW_KEY_EXCH_B:
451 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
452
453 /* clear this, it may get reset by
454 * send_server_key_exchange */
455 if ((s->options & SSL_OP_EPHEMERAL_RSA)
456 #ifndef OPENSSL_NO_KRB5
457 && !(alg_k & SSL_kKRB5)
458 #endif /* OPENSSL_NO_KRB5 */
459 )
460 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
461 * even when forbidden by protocol specs
462 * (handshake may fail as clients are not required to
463 * be able to handle this) */
464 s->s3->tmp.use_rsa_tmp=1;
465 else
466 s->s3->tmp.use_rsa_tmp=0;
467
468 /* only send if a DH key exchange or
469 * RSA but we have a sign only certificate */
470 if (s->s3->tmp.use_rsa_tmp
471 /* PSK: send ServerKeyExchange if PSK identity
472 * hint if provided */
473 #ifndef OPENSSL_NO_PSK
474 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
475 #endif
476 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
477 || (alg_k & SSL_kEECDH)
478 || ((alg_k & SSL_kRSA)
479 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
480 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
481 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
482 )
483 )
484 )
485 )
486 {
487 dtls1_start_timer(s);
488 ret=dtls1_send_server_key_exchange(s);
489 if (ret <= 0) goto end;
490 }
491 else
492 skip=1;
493
494 s->state=SSL3_ST_SW_CERT_REQ_A;
495 s->init_num=0;
496 break;
497
498 case SSL3_ST_SW_CERT_REQ_A:
499 case SSL3_ST_SW_CERT_REQ_B:
500 if (/* don't request cert unless asked for it: */
501 !(s->verify_mode & SSL_VERIFY_PEER) ||
502 /* if SSL_VERIFY_CLIENT_ONCE is set,
503 * don't request cert during re-negotiation: */
504 ((s->session->peer != NULL) &&
505 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
506 /* never request cert in anonymous ciphersuites
507 * (see section "Certificate request" in SSL 3 drafts
508 * and in RFC 2246): */
509 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
510 /* ... except when the application insists on verification
511 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
512 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
513 /* never request cert in Kerberos ciphersuites */
514 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
515 /* With normal PSK Certificates and
516 * Certificate Requests are omitted */
517 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
518 {
519 /* no cert request */
520 skip=1;
521 s->s3->tmp.cert_request=0;
522 s->state=SSL3_ST_SW_SRVR_DONE_A;
523 #ifndef OPENSSL_NO_SCTP
524 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
525 {
526 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
527 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
528 }
529 #endif
530 }
531 else
532 {
533 s->s3->tmp.cert_request=1;
534 dtls1_start_timer(s);
535 ret=dtls1_send_certificate_request(s);
536 if (ret <= 0) goto end;
537 #ifndef NETSCAPE_HANG_BUG
538 s->state=SSL3_ST_SW_SRVR_DONE_A;
539 #ifndef OPENSSL_NO_SCTP
540 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
541 {
542 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
543 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
544 }
545 #endif
546 #else
547 s->state=SSL3_ST_SW_FLUSH;
548 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
549 #ifndef OPENSSL_NO_SCTP
550 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
551 {
552 s->d1->next_state = s->s3->tmp.next_state;
553 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
554 }
555 #endif
556 #endif
557 s->init_num=0;
558 }
559 break;
560
561 case SSL3_ST_SW_SRVR_DONE_A:
562 case SSL3_ST_SW_SRVR_DONE_B:
563 dtls1_start_timer(s);
564 ret=dtls1_send_server_done(s);
565 if (ret <= 0) goto end;
566 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
567 s->state=SSL3_ST_SW_FLUSH;
568 s->init_num=0;
569 break;
570
571 case SSL3_ST_SW_FLUSH:
572 s->rwstate=SSL_WRITING;
573 if (BIO_flush(s->wbio) <= 0)
574 {
575 /* If the write error was fatal, stop trying */
576 if (!BIO_should_retry(s->wbio))
577 {
578 s->rwstate=SSL_NOTHING;
579 s->state=s->s3->tmp.next_state;
580 }
581
582 ret= -1;
583 goto end;
584 }
585 s->rwstate=SSL_NOTHING;
586 s->state=s->s3->tmp.next_state;
587 break;
588
589 case SSL3_ST_SR_CERT_A:
590 case SSL3_ST_SR_CERT_B:
591 /* Check for second client hello (MS SGC) */
592 ret = ssl3_check_client_hello(s);
593 if (ret <= 0)
594 goto end;
595 if (ret == 2)
596 {
597 dtls1_stop_timer(s);
598 s->state = SSL3_ST_SR_CLNT_HELLO_C;
599 }
600 else {
601 if (s->s3->tmp.cert_request)
602 {
603 ret=ssl3_get_client_certificate(s);
604 if (ret <= 0) goto end;
605 }
606 s->init_num=0;
607 s->state=SSL3_ST_SR_KEY_EXCH_A;
608 }
609 break;
610
611 case SSL3_ST_SR_KEY_EXCH_A:
612 case SSL3_ST_SR_KEY_EXCH_B:
613 ret=ssl3_get_client_key_exchange(s);
614 if (ret <= 0) goto end;
615 #ifndef OPENSSL_NO_SCTP
616 /* Add new shared key for SCTP-Auth,
617 * will be ignored if no SCTP used.
618 */
619 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
620 DTLS1_SCTP_AUTH_LABEL);
621
622 SSL_export_keying_material(s, sctpauthkey,
623 sizeof(sctpauthkey), labelbuffer,
624 sizeof(labelbuffer), NULL, 0, 0);
625
626 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
627 sizeof(sctpauthkey), sctpauthkey);
628 #endif
629
630 s->state=SSL3_ST_SR_CERT_VRFY_A;
631 s->init_num=0;
632
633 if (ret == 2)
634 {
635 /* For the ECDH ciphersuites when
636 * the client sends its ECDH pub key in
637 * a certificate, the CertificateVerify
638 * message is not sent.
639 */
640 s->state=SSL3_ST_SR_FINISHED_A;
641 s->init_num = 0;
642 }
643 else
644 {
645 s->state=SSL3_ST_SR_CERT_VRFY_A;
646 s->init_num=0;
647
648 /* We need to get hashes here so if there is
649 * a client cert, it can be verified */
650 s->method->ssl3_enc->cert_verify_mac(s,
651 NID_md5,
652 &(s->s3->tmp.cert_verify_md[0]));
653 s->method->ssl3_enc->cert_verify_mac(s,
654 NID_sha1,
655 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
656 }
657 break;
658
659 case SSL3_ST_SR_CERT_VRFY_A:
660 case SSL3_ST_SR_CERT_VRFY_B:
661
662 s->d1->change_cipher_spec_ok = 1;
663 /* we should decide if we expected this one */
664 ret=ssl3_get_cert_verify(s);
665 if (ret <= 0) goto end;
666 #ifndef OPENSSL_NO_SCTP
667 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
668 state == SSL_ST_RENEGOTIATE)
669 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
670 else
671 #endif
672 s->state=SSL3_ST_SR_FINISHED_A;
673 s->init_num=0;
674 break;
675
676 case SSL3_ST_SR_FINISHED_A:
677 case SSL3_ST_SR_FINISHED_B:
678 s->d1->change_cipher_spec_ok = 1;
679 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
680 SSL3_ST_SR_FINISHED_B);
681 if (ret <= 0) goto end;
682 dtls1_stop_timer(s);
683 if (s->hit)
684 s->state=SSL_ST_OK;
685 #ifndef OPENSSL_NO_TLSEXT
686 else if (s->tlsext_ticket_expected)
687 s->state=SSL3_ST_SW_SESSION_TICKET_A;
688 #endif
689 else
690 s->state=SSL3_ST_SW_CHANGE_A;
691 s->init_num=0;
692 break;
693
694 #ifndef OPENSSL_NO_TLSEXT
695 case SSL3_ST_SW_SESSION_TICKET_A:
696 case SSL3_ST_SW_SESSION_TICKET_B:
697 ret=dtls1_send_newsession_ticket(s);
698 if (ret <= 0) goto end;
699 s->state=SSL3_ST_SW_CHANGE_A;
700 s->init_num=0;
701 break;
702
703 case SSL3_ST_SW_CERT_STATUS_A:
704 case SSL3_ST_SW_CERT_STATUS_B:
705 ret=ssl3_send_cert_status(s);
706 if (ret <= 0) goto end;
707 s->state=SSL3_ST_SW_KEY_EXCH_A;
708 s->init_num=0;
709 break;
710
711 #endif
712
713 case SSL3_ST_SW_CHANGE_A:
714 case SSL3_ST_SW_CHANGE_B:
715
716 s->session->cipher=s->s3->tmp.new_cipher;
717 if (!s->method->ssl3_enc->setup_key_block(s))
718 { ret= -1; goto end; }
719
720 ret=dtls1_send_change_cipher_spec(s,
721 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
722
723 if (ret <= 0) goto end;
724
725 #ifndef OPENSSL_NO_SCTP
726 if (!s->hit)
727 {
728 /* Change to new shared key of SCTP-Auth,
729 * will be ignored if no SCTP used.
730 */
731 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
732 }
733 #endif
734
735 s->state=SSL3_ST_SW_FINISHED_A;
736 s->init_num=0;
737
738 if (!s->method->ssl3_enc->change_cipher_state(s,
739 SSL3_CHANGE_CIPHER_SERVER_WRITE))
740 {
741 ret= -1;
742 goto end;
743 }
744
745 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
746 break;
747
748 case SSL3_ST_SW_FINISHED_A:
749 case SSL3_ST_SW_FINISHED_B:
750 ret=dtls1_send_finished(s,
751 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
752 s->method->ssl3_enc->server_finished_label,
753 s->method->ssl3_enc->server_finished_label_len);
754 if (ret <= 0) goto end;
755 s->state=SSL3_ST_SW_FLUSH;
756 if (s->hit)
757 {
758 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
759
760 #ifndef OPENSSL_NO_SCTP
761 /* Change to new shared key of SCTP-Auth,
762 * will be ignored if no SCTP used.
763 */
764 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
765 #endif
766 }
767 else
768 {
769 s->s3->tmp.next_state=SSL_ST_OK;
770 #ifndef OPENSSL_NO_SCTP
771 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
772 {
773 s->d1->next_state = s->s3->tmp.next_state;
774 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
775 }
776 #endif
777 }
778 s->init_num=0;
779 break;
780
781 case SSL_ST_OK:
782 /* clean a few things up */
783 ssl3_cleanup_key_block(s);
784
785 #if 0
786 BUF_MEM_free(s->init_buf);
787 s->init_buf=NULL;
788 #endif
789
790 /* remove buffering on output */
791 ssl_free_wbio_buffer(s);
792
793 s->init_num=0;
794
795 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
796 {
797 s->renegotiate=0;
798 s->new_session=0;
799
800 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
801
802 s->ctx->stats.sess_accept_good++;
803 /* s->server=1; */
804 s->handshake_func=dtls1_accept;
805
806 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
807 }
808
809 ret = 1;
810
811 /* done handshaking, next message is client hello */
812 s->d1->handshake_read_seq = 0;
813 /* next message is server hello */
814 s->d1->handshake_write_seq = 0;
815 s->d1->next_handshake_write_seq = 0;
816 goto end;
817 /* break; */
818
819 default:
820 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
821 ret= -1;
822 goto end;
823 /* break; */
824 }
825
826 if (!s->s3->tmp.reuse_message && !skip)
827 {
828 if (s->debug)
829 {
830 if ((ret=BIO_flush(s->wbio)) <= 0)
831 goto end;
832 }
833
834
835 if ((cb != NULL) && (s->state != state))
836 {
837 new_state=s->state;
838 s->state=state;
839 cb(s,SSL_CB_ACCEPT_LOOP,1);
840 s->state=new_state;
841 }
842 }
843 skip=0;
844 }
845 end:
846 /* BIO_flush(s->wbio); */
847
848 s->in_handshake--;
849 #ifndef OPENSSL_NO_SCTP
850 /* Notify SCTP BIO socket to leave handshake
851 * mode and prevent stream identifier other
852 * than 0. Will be ignored if no SCTP is used.
853 */
854 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
855 #endif
856
857 if (cb != NULL)
858 cb(s,SSL_CB_ACCEPT_EXIT,ret);
859 return(ret);
860 }
861
862 int dtls1_send_hello_request(SSL *s)
863 {
864 unsigned char *p;
865
866 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
867 {
868 p=(unsigned char *)s->init_buf->data;
869 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
870
871 s->state=SSL3_ST_SW_HELLO_REQ_B;
872 /* number of bytes to write */
873 s->init_num=DTLS1_HM_HEADER_LENGTH;
874 s->init_off=0;
875
876 /* no need to buffer this message, since there are no retransmit
877 * requests for it */
878 }
879
880 /* SSL3_ST_SW_HELLO_REQ_B */
881 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
882 }
883
884 int dtls1_send_hello_verify_request(SSL *s)
885 {
886 unsigned int msg_len;
887 unsigned char *msg, *buf, *p;
888
889 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
890 {
891 buf = (unsigned char *)s->init_buf->data;
892
893 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
894 *(p++) = s->version >> 8;
895 *(p++) = s->version & 0xFF;
896
897 if (s->ctx->app_gen_cookie_cb == NULL ||
898 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
899 &(s->d1->cookie_len)) == 0)
900 {
901 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
902 return 0;
903 }
904
905 *(p++) = (unsigned char) s->d1->cookie_len;
906 memcpy(p, s->d1->cookie, s->d1->cookie_len);
907 p += s->d1->cookie_len;
908 msg_len = p - msg;
909
910 dtls1_set_message_header(s, buf,
911 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
912
913 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
914 /* number of bytes to write */
915 s->init_num=p-buf;
916 s->init_off=0;
917 }
918
919 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
920 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
921 }
922
923 int dtls1_send_server_hello(SSL *s)
924 {
925 unsigned char *buf;
926 unsigned char *p,*d;
927 int i;
928 unsigned int sl;
929 unsigned long l;
930
931 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
932 {
933 buf=(unsigned char *)s->init_buf->data;
934 p=s->s3->server_random;
935 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
936 /* Do the message type and length last */
937 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
938
939 *(p++)=s->version>>8;
940 *(p++)=s->version&0xff;
941
942 /* Random stuff */
943 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
944 p+=SSL3_RANDOM_SIZE;
945
946 /* now in theory we have 3 options to sending back the
947 * session id. If it is a re-use, we send back the
948 * old session-id, if it is a new session, we send
949 * back the new session-id or we send back a 0 length
950 * session-id if we want it to be single use.
951 * Currently I will not implement the '0' length session-id
952 * 12-Jan-98 - I'll now support the '0' length stuff.
953 */
954 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
955 s->session->session_id_length=0;
956
957 sl=s->session->session_id_length;
958 if (sl > sizeof s->session->session_id)
959 {
960 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
961 return -1;
962 }
963 *(p++)=sl;
964 memcpy(p,s->session->session_id,sl);
965 p+=sl;
966
967 /* put the cipher */
968 if (s->s3->tmp.new_cipher == NULL)
969 return -1;
970 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
971 p+=i;
972
973 /* put the compression method */
974 #ifdef OPENSSL_NO_COMP
975 *(p++)=0;
976 #else
977 if (s->s3->tmp.new_compression == NULL)
978 *(p++)=0;
979 else
980 *(p++)=s->s3->tmp.new_compression->id;
981 #endif
982
983 #ifndef OPENSSL_NO_TLSEXT
984 if (ssl_prepare_serverhello_tlsext(s) <= 0)
985 {
986 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
987 return -1;
988 }
989 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
990 {
991 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
992 return -1;
993 }
994 #endif
995
996 /* do the header */
997 l=(p-d);
998 d=buf;
999
1000 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1001
1002 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1003 /* number of bytes to write */
1004 s->init_num=p-buf;
1005 s->init_off=0;
1006
1007 /* buffer the message to handle re-xmits */
1008 dtls1_buffer_message(s, 0);
1009 }
1010
1011 /* SSL3_ST_SW_SRVR_HELLO_B */
1012 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1013 }
1014
1015 int dtls1_send_server_done(SSL *s)
1016 {
1017 unsigned char *p;
1018
1019 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1020 {
1021 p=(unsigned char *)s->init_buf->data;
1022
1023 /* do the header */
1024 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1025
1026 s->state=SSL3_ST_SW_SRVR_DONE_B;
1027 /* number of bytes to write */
1028 s->init_num=DTLS1_HM_HEADER_LENGTH;
1029 s->init_off=0;
1030
1031 /* buffer the message to handle re-xmits */
1032 dtls1_buffer_message(s, 0);
1033 }
1034
1035 /* SSL3_ST_SW_SRVR_DONE_B */
1036 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1037 }
1038
1039 int dtls1_send_server_key_exchange(SSL *s)
1040 {
1041 #ifndef OPENSSL_NO_RSA
1042 unsigned char *q;
1043 int j,num;
1044 RSA *rsa;
1045 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1046 unsigned int u;
1047 #endif
1048 #ifndef OPENSSL_NO_DH
1049 DH *dh=NULL,*dhp;
1050 #endif
1051 #ifndef OPENSSL_NO_ECDH
1052 EC_KEY *ecdh=NULL, *ecdhp;
1053 unsigned char *encodedPoint = NULL;
1054 int encodedlen = 0;
1055 int curve_id = 0;
1056 BN_CTX *bn_ctx = NULL;
1057 #endif
1058 EVP_PKEY *pkey;
1059 unsigned char *p,*d;
1060 int al,i;
1061 unsigned long type;
1062 int n;
1063 CERT *cert;
1064 BIGNUM *r[4];
1065 int nr[4],kn;
1066 BUF_MEM *buf;
1067 EVP_MD_CTX md_ctx;
1068
1069 EVP_MD_CTX_init(&md_ctx);
1070 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1071 {
1072 type=s->s3->tmp.new_cipher->algorithm_mkey;
1073 cert=s->cert;
1074
1075 buf=s->init_buf;
1076
1077 r[0]=r[1]=r[2]=r[3]=NULL;
1078 n=0;
1079 #ifndef OPENSSL_NO_RSA
1080 if (type & SSL_kRSA)
1081 {
1082 rsa=cert->rsa_tmp;
1083 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1084 {
1085 rsa=s->cert->rsa_tmp_cb(s,
1086 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1087 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1088 if(rsa == NULL)
1089 {
1090 al=SSL_AD_HANDSHAKE_FAILURE;
1091 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1092 goto f_err;
1093 }
1094 RSA_up_ref(rsa);
1095 cert->rsa_tmp=rsa;
1096 }
1097 if (rsa == NULL)
1098 {
1099 al=SSL_AD_HANDSHAKE_FAILURE;
1100 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1101 goto f_err;
1102 }
1103 r[0]=rsa->n;
1104 r[1]=rsa->e;
1105 s->s3->tmp.use_rsa_tmp=1;
1106 }
1107 else
1108 #endif
1109 #ifndef OPENSSL_NO_DH
1110 if (type & SSL_kEDH)
1111 {
1112 dhp=cert->dh_tmp;
1113 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1114 dhp=s->cert->dh_tmp_cb(s,
1115 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1116 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1117 if (dhp == NULL)
1118 {
1119 al=SSL_AD_HANDSHAKE_FAILURE;
1120 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1121 goto f_err;
1122 }
1123
1124 if (s->s3->tmp.dh != NULL)
1125 {
1126 DH_free(dh);
1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1128 goto err;
1129 }
1130
1131 if ((dh=DHparams_dup(dhp)) == NULL)
1132 {
1133 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1134 goto err;
1135 }
1136
1137 s->s3->tmp.dh=dh;
1138 if ((dhp->pub_key == NULL ||
1139 dhp->priv_key == NULL ||
1140 (s->options & SSL_OP_SINGLE_DH_USE)))
1141 {
1142 if(!DH_generate_key(dh))
1143 {
1144 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1145 ERR_R_DH_LIB);
1146 goto err;
1147 }
1148 }
1149 else
1150 {
1151 dh->pub_key=BN_dup(dhp->pub_key);
1152 dh->priv_key=BN_dup(dhp->priv_key);
1153 if ((dh->pub_key == NULL) ||
1154 (dh->priv_key == NULL))
1155 {
1156 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1157 goto err;
1158 }
1159 }
1160 r[0]=dh->p;
1161 r[1]=dh->g;
1162 r[2]=dh->pub_key;
1163 }
1164 else
1165 #endif
1166 #ifndef OPENSSL_NO_ECDH
1167 if (type & SSL_kEECDH)
1168 {
1169 const EC_GROUP *group;
1170
1171 ecdhp=cert->ecdh_tmp;
1172 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1173 {
1174 ecdhp=s->cert->ecdh_tmp_cb(s,
1175 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1176 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1177 }
1178 if (ecdhp == NULL)
1179 {
1180 al=SSL_AD_HANDSHAKE_FAILURE;
1181 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1182 goto f_err;
1183 }
1184
1185 if (s->s3->tmp.ecdh != NULL)
1186 {
1187 EC_KEY_free(s->s3->tmp.ecdh);
1188 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1189 goto err;
1190 }
1191
1192 /* Duplicate the ECDH structure. */
1193 if (ecdhp == NULL)
1194 {
1195 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1196 goto err;
1197 }
1198 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1199 {
1200 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1201 goto err;
1202 }
1203
1204 s->s3->tmp.ecdh=ecdh;
1205 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1206 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1207 (s->options & SSL_OP_SINGLE_ECDH_USE))
1208 {
1209 if(!EC_KEY_generate_key(ecdh))
1210 {
1211 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1212 goto err;
1213 }
1214 }
1215
1216 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1217 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1218 (EC_KEY_get0_private_key(ecdh) == NULL))
1219 {
1220 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1221 goto err;
1222 }
1223
1224 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1225 (EC_GROUP_get_degree(group) > 163))
1226 {
1227 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1228 goto err;
1229 }
1230
1231 /* XXX: For now, we only support ephemeral ECDH
1232 * keys over named (not generic) curves. For
1233 * supported named curves, curve_id is non-zero.
1234 */
1235 if ((curve_id =
1236 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1237 == 0)
1238 {
1239 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1240 goto err;
1241 }
1242
1243 /* Encode the public key.
1244 * First check the size of encoding and
1245 * allocate memory accordingly.
1246 */
1247 encodedlen = EC_POINT_point2oct(group,
1248 EC_KEY_get0_public_key(ecdh),
1249 POINT_CONVERSION_UNCOMPRESSED,
1250 NULL, 0, NULL);
1251
1252 encodedPoint = (unsigned char *)
1253 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1254 bn_ctx = BN_CTX_new();
1255 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1256 {
1257 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1258 goto err;
1259 }
1260
1261
1262 encodedlen = EC_POINT_point2oct(group,
1263 EC_KEY_get0_public_key(ecdh),
1264 POINT_CONVERSION_UNCOMPRESSED,
1265 encodedPoint, encodedlen, bn_ctx);
1266
1267 if (encodedlen == 0)
1268 {
1269 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1270 goto err;
1271 }
1272
1273 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1274
1275 /* XXX: For now, we only support named (not
1276 * generic) curves in ECDH ephemeral key exchanges.
1277 * In this situation, we need four additional bytes
1278 * to encode the entire ServerECDHParams
1279 * structure.
1280 */
1281 n = 4 + encodedlen;
1282
1283 /* We'll generate the serverKeyExchange message
1284 * explicitly so we can set these to NULLs
1285 */
1286 r[0]=NULL;
1287 r[1]=NULL;
1288 r[2]=NULL;
1289 r[3]=NULL;
1290 }
1291 else
1292 #endif /* !OPENSSL_NO_ECDH */
1293 #ifndef OPENSSL_NO_PSK
1294 if (type & SSL_kPSK)
1295 {
1296 /* reserve size for record length and PSK identity hint*/
1297 n+=2+strlen(s->ctx->psk_identity_hint);
1298 }
1299 else
1300 #endif /* !OPENSSL_NO_PSK */
1301 {
1302 al=SSL_AD_HANDSHAKE_FAILURE;
1303 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1304 goto f_err;
1305 }
1306 for (i=0; r[i] != NULL; i++)
1307 {
1308 nr[i]=BN_num_bytes(r[i]);
1309 n+=2+nr[i];
1310 }
1311
1312 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1313 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1314 {
1315 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1316 == NULL)
1317 {
1318 al=SSL_AD_DECODE_ERROR;
1319 goto f_err;
1320 }
1321 kn=EVP_PKEY_size(pkey);
1322 }
1323 else
1324 {
1325 pkey=NULL;
1326 kn=0;
1327 }
1328
1329 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1330 {
1331 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1332 goto err;
1333 }
1334 d=(unsigned char *)s->init_buf->data;
1335 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1336
1337 for (i=0; r[i] != NULL; i++)
1338 {
1339 s2n(nr[i],p);
1340 BN_bn2bin(r[i],p);
1341 p+=nr[i];
1342 }
1343
1344 #ifndef OPENSSL_NO_ECDH
1345 if (type & SSL_kEECDH)
1346 {
1347 /* XXX: For now, we only support named (not generic) curves.
1348 * In this situation, the serverKeyExchange message has:
1349 * [1 byte CurveType], [2 byte CurveName]
1350 * [1 byte length of encoded point], followed by
1351 * the actual encoded point itself
1352 */
1353 *p = NAMED_CURVE_TYPE;
1354 p += 1;
1355 *p = 0;
1356 p += 1;
1357 *p = curve_id;
1358 p += 1;
1359 *p = encodedlen;
1360 p += 1;
1361 memcpy((unsigned char*)p,
1362 (unsigned char *)encodedPoint,
1363 encodedlen);
1364 OPENSSL_free(encodedPoint);
1365 encodedPoint = NULL;
1366 p += encodedlen;
1367 }
1368 #endif
1369
1370 #ifndef OPENSSL_NO_PSK
1371 if (type & SSL_kPSK)
1372 {
1373 /* copy PSK identity hint */
1374 s2n(strlen(s->ctx->psk_identity_hint), p);
1375 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1376 p+=strlen(s->ctx->psk_identity_hint);
1377 }
1378 #endif
1379
1380 /* not anonymous */
1381 if (pkey != NULL)
1382 {
1383 /* n is the length of the params, they start at
1384 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1385 * at the end. */
1386 #ifndef OPENSSL_NO_RSA
1387 if (pkey->type == EVP_PKEY_RSA)
1388 {
1389 q=md_buf;
1390 j=0;
1391 for (num=2; num > 0; num--)
1392 {
1393 EVP_DigestInit_ex(&md_ctx,(num == 2)
1394 ?s->ctx->md5:s->ctx->sha1, NULL);
1395 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1396 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1397 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1398 EVP_DigestFinal_ex(&md_ctx,q,
1399 (unsigned int *)&i);
1400 q+=i;
1401 j+=i;
1402 }
1403 if (RSA_sign(NID_md5_sha1, md_buf, j,
1404 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1405 {
1406 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1407 goto err;
1408 }
1409 s2n(u,p);
1410 n+=u+2;
1411 }
1412 else
1413 #endif
1414 #if !defined(OPENSSL_NO_DSA)
1415 if (pkey->type == EVP_PKEY_DSA)
1416 {
1417 /* lets do DSS */
1418 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1419 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1420 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1421 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1422 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1423 (unsigned int *)&i,pkey))
1424 {
1425 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1426 goto err;
1427 }
1428 s2n(i,p);
1429 n+=i+2;
1430 }
1431 else
1432 #endif
1433 #if !defined(OPENSSL_NO_ECDSA)
1434 if (pkey->type == EVP_PKEY_EC)
1435 {
1436 /* let's do ECDSA */
1437 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1438 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1439 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1440 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1441 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1442 (unsigned int *)&i,pkey))
1443 {
1444 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1445 goto err;
1446 }
1447 s2n(i,p);
1448 n+=i+2;
1449 }
1450 else
1451 #endif
1452 {
1453 /* Is this error check actually needed? */
1454 al=SSL_AD_HANDSHAKE_FAILURE;
1455 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1456 goto f_err;
1457 }
1458 }
1459
1460 d = dtls1_set_message_header(s, d,
1461 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1462
1463 /* we should now have things packed up, so lets send
1464 * it off */
1465 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1466 s->init_off=0;
1467
1468 /* buffer the message to handle re-xmits */
1469 dtls1_buffer_message(s, 0);
1470 }
1471
1472 s->state = SSL3_ST_SW_KEY_EXCH_B;
1473 EVP_MD_CTX_cleanup(&md_ctx);
1474 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1475 f_err:
1476 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1477 err:
1478 #ifndef OPENSSL_NO_ECDH
1479 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1480 BN_CTX_free(bn_ctx);
1481 #endif
1482 EVP_MD_CTX_cleanup(&md_ctx);
1483 return(-1);
1484 }
1485
1486 int dtls1_send_certificate_request(SSL *s)
1487 {
1488 unsigned char *p,*d;
1489 int i,j,nl,off,n;
1490 STACK_OF(X509_NAME) *sk=NULL;
1491 X509_NAME *name;
1492 BUF_MEM *buf;
1493 unsigned int msg_len;
1494
1495 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1496 {
1497 buf=s->init_buf;
1498
1499 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1500
1501 /* get the list of acceptable cert types */
1502 p++;
1503 n=ssl3_get_req_cert_type(s,p);
1504 d[0]=n;
1505 p+=n;
1506 n++;
1507
1508 off=n;
1509 p+=2;
1510 n+=2;
1511
1512 sk=SSL_get_client_CA_list(s);
1513 nl=0;
1514 if (sk != NULL)
1515 {
1516 for (i=0; i<sk_X509_NAME_num(sk); i++)
1517 {
1518 name=sk_X509_NAME_value(sk,i);
1519 j=i2d_X509_NAME(name,NULL);
1520 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1521 {
1522 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1523 goto err;
1524 }
1525 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1526 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1527 {
1528 s2n(j,p);
1529 i2d_X509_NAME(name,&p);
1530 n+=2+j;
1531 nl+=2+j;
1532 }
1533 else
1534 {
1535 d=p;
1536 i2d_X509_NAME(name,&p);
1537 j-=2; s2n(j,d); j+=2;
1538 n+=j;
1539 nl+=j;
1540 }
1541 }
1542 }
1543 /* else no CA names */
1544 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1545 s2n(nl,p);
1546
1547 d=(unsigned char *)buf->data;
1548 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1549 l2n3(n,d);
1550 s2n(s->d1->handshake_write_seq,d);
1551 s->d1->handshake_write_seq++;
1552
1553 /* we should now have things packed up, so lets send
1554 * it off */
1555
1556 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1557 s->init_off=0;
1558 #ifdef NETSCAPE_HANG_BUG
1559 /* XXX: what to do about this? */
1560 p=(unsigned char *)s->init_buf->data + s->init_num;
1561
1562 /* do the header */
1563 *(p++)=SSL3_MT_SERVER_DONE;
1564 *(p++)=0;
1565 *(p++)=0;
1566 *(p++)=0;
1567 s->init_num += 4;
1568 #endif
1569
1570 /* XDTLS: set message header ? */
1571 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1572 dtls1_set_message_header(s, (void *)s->init_buf->data,
1573 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1574
1575 /* buffer the message to handle re-xmits */
1576 dtls1_buffer_message(s, 0);
1577
1578 s->state = SSL3_ST_SW_CERT_REQ_B;
1579 }
1580
1581 /* SSL3_ST_SW_CERT_REQ_B */
1582 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1583 err:
1584 return(-1);
1585 }
1586
1587 int dtls1_send_server_certificate(SSL *s)
1588 {
1589 unsigned long l;
1590 X509 *x;
1591
1592 if (s->state == SSL3_ST_SW_CERT_A)
1593 {
1594 x=ssl_get_server_send_cert(s);
1595 if (x == NULL)
1596 {
1597 /* VRS: allow null cert if auth == KRB5 */
1598 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1599 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1600 {
1601 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1602 return(0);
1603 }
1604 }
1605
1606 l=dtls1_output_cert_chain(s,x);
1607 s->state=SSL3_ST_SW_CERT_B;
1608 s->init_num=(int)l;
1609 s->init_off=0;
1610
1611 /* buffer the message to handle re-xmits */
1612 dtls1_buffer_message(s, 0);
1613 }
1614
1615 /* SSL3_ST_SW_CERT_B */
1616 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1617 }
1618
1619 #ifndef OPENSSL_NO_TLSEXT
1620 int dtls1_send_newsession_ticket(SSL *s)
1621 {
1622 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1623 {
1624 unsigned char *p, *senc, *macstart;
1625 int len, slen;
1626 unsigned int hlen, msg_len;
1627 EVP_CIPHER_CTX ctx;
1628 HMAC_CTX hctx;
1629 SSL_CTX *tctx = s->initial_ctx;
1630 unsigned char iv[EVP_MAX_IV_LENGTH];
1631 unsigned char key_name[16];
1632
1633 /* get session encoding length */
1634 slen = i2d_SSL_SESSION(s->session, NULL);
1635 /* Some length values are 16 bits, so forget it if session is
1636 * too long
1637 */
1638 if (slen > 0xFF00)
1639 return -1;
1640 /* Grow buffer if need be: the length calculation is as
1641 * follows 12 (DTLS handshake message header) +
1642 * 4 (ticket lifetime hint) + 2 (ticket length) +
1643 * 16 (key name) + max_iv_len (iv length) +
1644 * session_length + max_enc_block_size (max encrypted session
1645 * length) + max_md_size (HMAC).
1646 */
1647 if (!BUF_MEM_grow(s->init_buf,
1648 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1649 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1650 return -1;
1651 senc = OPENSSL_malloc(slen);
1652 if (!senc)
1653 return -1;
1654 p = senc;
1655 i2d_SSL_SESSION(s->session, &p);
1656
1657 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1658 EVP_CIPHER_CTX_init(&ctx);
1659 HMAC_CTX_init(&hctx);
1660 /* Initialize HMAC and cipher contexts. If callback present
1661 * it does all the work otherwise use generated values
1662 * from parent ctx.
1663 */
1664 if (tctx->tlsext_ticket_key_cb)
1665 {
1666 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1667 &hctx, 1) < 0)
1668 {
1669 OPENSSL_free(senc);
1670 return -1;
1671 }
1672 }
1673 else
1674 {
1675 RAND_pseudo_bytes(iv, 16);
1676 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1677 tctx->tlsext_tick_aes_key, iv);
1678 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1679 tlsext_tick_md(), NULL);
1680 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1681 }
1682 l2n(s->session->tlsext_tick_lifetime_hint, p);
1683 /* Skip ticket length for now */
1684 p += 2;
1685 /* Output key name */
1686 macstart = p;
1687 memcpy(p, key_name, 16);
1688 p += 16;
1689 /* output IV */
1690 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1691 p += EVP_CIPHER_CTX_iv_length(&ctx);
1692 /* Encrypt session data */
1693 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1694 p += len;
1695 EVP_EncryptFinal(&ctx, p, &len);
1696 p += len;
1697 EVP_CIPHER_CTX_cleanup(&ctx);
1698
1699 HMAC_Update(&hctx, macstart, p - macstart);
1700 HMAC_Final(&hctx, p, &hlen);
1701 HMAC_CTX_cleanup(&hctx);
1702
1703 p += hlen;
1704 /* Now write out lengths: p points to end of data written */
1705 /* Total length */
1706 len = p - (unsigned char *)(s->init_buf->data);
1707 /* Ticket length */
1708 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1709 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1710
1711 /* number of bytes to write */
1712 s->init_num= len;
1713 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1714 s->init_off=0;
1715 OPENSSL_free(senc);
1716
1717 /* XDTLS: set message header ? */
1718 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1719 dtls1_set_message_header(s, (void *)s->init_buf->data,
1720 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1721
1722 /* buffer the message to handle re-xmits */
1723 dtls1_buffer_message(s, 0);
1724 }
1725
1726 /* SSL3_ST_SW_SESSION_TICKET_B */
1727 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1728 }
1729 #endif