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openssl update: 1.0.1h
[tomato.git] / release / src / router / openssl / ssl / d1_srvr.c
blob1384ab0cbf171cb89a8ef0d3e5432b06814367ee
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 /* could be sent for a DH cert, even if we
602 * have not asked for it :-) */
603 ret=ssl3_get_client_certificate(s);
604 if (ret <= 0) goto end;
605 s->init_num=0;
606 s->state=SSL3_ST_SR_KEY_EXCH_A;
607 }
608 break;
609
610 case SSL3_ST_SR_KEY_EXCH_A:
611 case SSL3_ST_SR_KEY_EXCH_B:
612 ret=ssl3_get_client_key_exchange(s);
613 if (ret <= 0) goto end;
614 #ifndef OPENSSL_NO_SCTP
615 /* Add new shared key for SCTP-Auth,
616 * will be ignored if no SCTP used.
617 */
618 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
619 DTLS1_SCTP_AUTH_LABEL);
620
621 SSL_export_keying_material(s, sctpauthkey,
622 sizeof(sctpauthkey), labelbuffer,
623 sizeof(labelbuffer), NULL, 0, 0);
624
625 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
626 sizeof(sctpauthkey), sctpauthkey);
627 #endif
628
629 s->state=SSL3_ST_SR_CERT_VRFY_A;
630 s->init_num=0;
631
632 if (ret == 2)
633 {
634 /* For the ECDH ciphersuites when
635 * the client sends its ECDH pub key in
636 * a certificate, the CertificateVerify
637 * message is not sent.
638 */
639 s->state=SSL3_ST_SR_FINISHED_A;
640 s->init_num = 0;
641 }
642 else
643 {
644 s->state=SSL3_ST_SR_CERT_VRFY_A;
645 s->init_num=0;
646
647 /* We need to get hashes here so if there is
648 * a client cert, it can be verified */
649 s->method->ssl3_enc->cert_verify_mac(s,
650 NID_md5,
651 &(s->s3->tmp.cert_verify_md[0]));
652 s->method->ssl3_enc->cert_verify_mac(s,
653 NID_sha1,
654 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
655 }
656 break;
657
658 case SSL3_ST_SR_CERT_VRFY_A:
659 case SSL3_ST_SR_CERT_VRFY_B:
660
661 s->d1->change_cipher_spec_ok = 1;
662 /* we should decide if we expected this one */
663 ret=ssl3_get_cert_verify(s);
664 if (ret <= 0) goto end;
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 if (!s->hit)
726 {
727 /* Change to new shared key of SCTP-Auth,
728 * will be ignored if no SCTP used.
729 */
730 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
731 }
732 #endif
733
734 s->state=SSL3_ST_SW_FINISHED_A;
735 s->init_num=0;
736
737 if (!s->method->ssl3_enc->change_cipher_state(s,
738 SSL3_CHANGE_CIPHER_SERVER_WRITE))
739 {
740 ret= -1;
741 goto end;
742 }
743
744 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
745 break;
746
747 case SSL3_ST_SW_FINISHED_A:
748 case SSL3_ST_SW_FINISHED_B:
749 ret=dtls1_send_finished(s,
750 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
751 s->method->ssl3_enc->server_finished_label,
752 s->method->ssl3_enc->server_finished_label_len);
753 if (ret <= 0) goto end;
754 s->state=SSL3_ST_SW_FLUSH;
755 if (s->hit)
756 {
757 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
758
759 #ifndef OPENSSL_NO_SCTP
760 /* Change to new shared key of SCTP-Auth,
761 * will be ignored if no SCTP used.
762 */
763 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
764 #endif
765 }
766 else
767 {
768 s->s3->tmp.next_state=SSL_ST_OK;
769 #ifndef OPENSSL_NO_SCTP
770 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
771 {
772 s->d1->next_state = s->s3->tmp.next_state;
773 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
774 }
775 #endif
776 }
777 s->init_num=0;
778 break;
779
780 case SSL_ST_OK:
781 /* clean a few things up */
782 ssl3_cleanup_key_block(s);
783
784 #if 0
785 BUF_MEM_free(s->init_buf);
786 s->init_buf=NULL;
787 #endif
788
789 /* remove buffering on output */
790 ssl_free_wbio_buffer(s);
791
792 s->init_num=0;
793
794 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
795 {
796 s->renegotiate=0;
797 s->new_session=0;
798
799 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
800
801 s->ctx->stats.sess_accept_good++;
802 /* s->server=1; */
803 s->handshake_func=dtls1_accept;
804
805 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
806 }
807
808 ret = 1;
809
810 /* done handshaking, next message is client hello */
811 s->d1->handshake_read_seq = 0;
812 /* next message is server hello */
813 s->d1->handshake_write_seq = 0;
814 s->d1->next_handshake_write_seq = 0;
815 goto end;
816 /* break; */
817
818 default:
819 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
820 ret= -1;
821 goto end;
822 /* break; */
823 }
824
825 if (!s->s3->tmp.reuse_message && !skip)
826 {
827 if (s->debug)
828 {
829 if ((ret=BIO_flush(s->wbio)) <= 0)
830 goto end;
831 }
832
833
834 if ((cb != NULL) && (s->state != state))
835 {
836 new_state=s->state;
837 s->state=state;
838 cb(s,SSL_CB_ACCEPT_LOOP,1);
839 s->state=new_state;
840 }
841 }
842 skip=0;
843 }
844 end:
845 /* BIO_flush(s->wbio); */
846
847 s->in_handshake--;
848 #ifndef OPENSSL_NO_SCTP
849 /* Notify SCTP BIO socket to leave handshake
850 * mode and prevent stream identifier other
851 * than 0. Will be ignored if no SCTP is used.
852 */
853 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
854 #endif
855
856 if (cb != NULL)
857 cb(s,SSL_CB_ACCEPT_EXIT,ret);
858 return(ret);
859 }
860
861 int dtls1_send_hello_request(SSL *s)
862 {
863 unsigned char *p;
864
865 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
866 {
867 p=(unsigned char *)s->init_buf->data;
868 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
869
870 s->state=SSL3_ST_SW_HELLO_REQ_B;
871 /* number of bytes to write */
872 s->init_num=DTLS1_HM_HEADER_LENGTH;
873 s->init_off=0;
874
875 /* no need to buffer this message, since there are no retransmit
876 * requests for it */
877 }
878
879 /* SSL3_ST_SW_HELLO_REQ_B */
880 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
881 }
882
883 int dtls1_send_hello_verify_request(SSL *s)
884 {
885 unsigned int msg_len;
886 unsigned char *msg, *buf, *p;
887
888 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
889 {
890 buf = (unsigned char *)s->init_buf->data;
891
892 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
893 *(p++) = s->version >> 8;
894 *(p++) = s->version & 0xFF;
895
896 if (s->ctx->app_gen_cookie_cb == NULL ||
897 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
898 &(s->d1->cookie_len)) == 0)
899 {
900 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
901 return 0;
902 }
903
904 *(p++) = (unsigned char) s->d1->cookie_len;
905 memcpy(p, s->d1->cookie, s->d1->cookie_len);
906 p += s->d1->cookie_len;
907 msg_len = p - msg;
908
909 dtls1_set_message_header(s, buf,
910 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
911
912 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
913 /* number of bytes to write */
914 s->init_num=p-buf;
915 s->init_off=0;
916 }
917
918 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
919 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
920 }
921
922 int dtls1_send_server_hello(SSL *s)
923 {
924 unsigned char *buf;
925 unsigned char *p,*d;
926 int i;
927 unsigned int sl;
928 unsigned long l;
929
930 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
931 {
932 buf=(unsigned char *)s->init_buf->data;
933 p=s->s3->server_random;
934 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
935 /* Do the message type and length last */
936 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
937
938 *(p++)=s->version>>8;
939 *(p++)=s->version&0xff;
940
941 /* Random stuff */
942 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
943 p+=SSL3_RANDOM_SIZE;
944
945 /* now in theory we have 3 options to sending back the
946 * session id. If it is a re-use, we send back the
947 * old session-id, if it is a new session, we send
948 * back the new session-id or we send back a 0 length
949 * session-id if we want it to be single use.
950 * Currently I will not implement the '0' length session-id
951 * 12-Jan-98 - I'll now support the '0' length stuff.
952 */
953 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
954 s->session->session_id_length=0;
955
956 sl=s->session->session_id_length;
957 if (sl > sizeof s->session->session_id)
958 {
959 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
960 return -1;
961 }
962 *(p++)=sl;
963 memcpy(p,s->session->session_id,sl);
964 p+=sl;
965
966 /* put the cipher */
967 if (s->s3->tmp.new_cipher == NULL)
968 return -1;
969 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
970 p+=i;
971
972 /* put the compression method */
973 #ifdef OPENSSL_NO_COMP
974 *(p++)=0;
975 #else
976 if (s->s3->tmp.new_compression == NULL)
977 *(p++)=0;
978 else
979 *(p++)=s->s3->tmp.new_compression->id;
980 #endif
981
982 #ifndef OPENSSL_NO_TLSEXT
983 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
984 {
985 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
986 return -1;
987 }
988 #endif
989
990 /* do the header */
991 l=(p-d);
992 d=buf;
993
994 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
995
996 s->state=SSL3_ST_SW_SRVR_HELLO_B;
997 /* number of bytes to write */
998 s->init_num=p-buf;
999 s->init_off=0;
1000
1001 /* buffer the message to handle re-xmits */
1002 dtls1_buffer_message(s, 0);
1003 }
1004
1005 /* SSL3_ST_SW_SRVR_HELLO_B */
1006 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1007 }
1008
1009 int dtls1_send_server_done(SSL *s)
1010 {
1011 unsigned char *p;
1012
1013 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1014 {
1015 p=(unsigned char *)s->init_buf->data;
1016
1017 /* do the header */
1018 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1019
1020 s->state=SSL3_ST_SW_SRVR_DONE_B;
1021 /* number of bytes to write */
1022 s->init_num=DTLS1_HM_HEADER_LENGTH;
1023 s->init_off=0;
1024
1025 /* buffer the message to handle re-xmits */
1026 dtls1_buffer_message(s, 0);
1027 }
1028
1029 /* SSL3_ST_SW_SRVR_DONE_B */
1030 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1031 }
1032
1033 int dtls1_send_server_key_exchange(SSL *s)
1034 {
1035 #ifndef OPENSSL_NO_RSA
1036 unsigned char *q;
1037 int j,num;
1038 RSA *rsa;
1039 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1040 unsigned int u;
1041 #endif
1042 #ifndef OPENSSL_NO_DH
1043 DH *dh=NULL,*dhp;
1044 #endif
1045 #ifndef OPENSSL_NO_ECDH
1046 EC_KEY *ecdh=NULL, *ecdhp;
1047 unsigned char *encodedPoint = NULL;
1048 int encodedlen = 0;
1049 int curve_id = 0;
1050 BN_CTX *bn_ctx = NULL;
1051 #endif
1052 EVP_PKEY *pkey;
1053 unsigned char *p,*d;
1054 int al,i;
1055 unsigned long type;
1056 int n;
1057 CERT *cert;
1058 BIGNUM *r[4];
1059 int nr[4],kn;
1060 BUF_MEM *buf;
1061 EVP_MD_CTX md_ctx;
1062
1063 EVP_MD_CTX_init(&md_ctx);
1064 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1065 {
1066 type=s->s3->tmp.new_cipher->algorithm_mkey;
1067 cert=s->cert;
1068
1069 buf=s->init_buf;
1070
1071 r[0]=r[1]=r[2]=r[3]=NULL;
1072 n=0;
1073 #ifndef OPENSSL_NO_RSA
1074 if (type & SSL_kRSA)
1075 {
1076 rsa=cert->rsa_tmp;
1077 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1078 {
1079 rsa=s->cert->rsa_tmp_cb(s,
1080 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1081 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1082 if(rsa == NULL)
1083 {
1084 al=SSL_AD_HANDSHAKE_FAILURE;
1085 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1086 goto f_err;
1087 }
1088 RSA_up_ref(rsa);
1089 cert->rsa_tmp=rsa;
1090 }
1091 if (rsa == NULL)
1092 {
1093 al=SSL_AD_HANDSHAKE_FAILURE;
1094 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1095 goto f_err;
1096 }
1097 r[0]=rsa->n;
1098 r[1]=rsa->e;
1099 s->s3->tmp.use_rsa_tmp=1;
1100 }
1101 else
1102 #endif
1103 #ifndef OPENSSL_NO_DH
1104 if (type & SSL_kEDH)
1105 {
1106 dhp=cert->dh_tmp;
1107 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1108 dhp=s->cert->dh_tmp_cb(s,
1109 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1110 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1111 if (dhp == NULL)
1112 {
1113 al=SSL_AD_HANDSHAKE_FAILURE;
1114 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1115 goto f_err;
1116 }
1117
1118 if (s->s3->tmp.dh != NULL)
1119 {
1120 DH_free(dh);
1121 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1122 goto err;
1123 }
1124
1125 if ((dh=DHparams_dup(dhp)) == NULL)
1126 {
1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1128 goto err;
1129 }
1130
1131 s->s3->tmp.dh=dh;
1132 if ((dhp->pub_key == NULL ||
1133 dhp->priv_key == NULL ||
1134 (s->options & SSL_OP_SINGLE_DH_USE)))
1135 {
1136 if(!DH_generate_key(dh))
1137 {
1138 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1139 ERR_R_DH_LIB);
1140 goto err;
1141 }
1142 }
1143 else
1144 {
1145 dh->pub_key=BN_dup(dhp->pub_key);
1146 dh->priv_key=BN_dup(dhp->priv_key);
1147 if ((dh->pub_key == NULL) ||
1148 (dh->priv_key == NULL))
1149 {
1150 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1151 goto err;
1152 }
1153 }
1154 r[0]=dh->p;
1155 r[1]=dh->g;
1156 r[2]=dh->pub_key;
1157 }
1158 else
1159 #endif
1160 #ifndef OPENSSL_NO_ECDH
1161 if (type & SSL_kEECDH)
1162 {
1163 const EC_GROUP *group;
1164
1165 ecdhp=cert->ecdh_tmp;
1166 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1167 {
1168 ecdhp=s->cert->ecdh_tmp_cb(s,
1169 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1170 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1171 }
1172 if (ecdhp == NULL)
1173 {
1174 al=SSL_AD_HANDSHAKE_FAILURE;
1175 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1176 goto f_err;
1177 }
1178
1179 if (s->s3->tmp.ecdh != NULL)
1180 {
1181 EC_KEY_free(s->s3->tmp.ecdh);
1182 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1183 goto err;
1184 }
1185
1186 /* Duplicate the ECDH structure. */
1187 if (ecdhp == NULL)
1188 {
1189 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1190 goto err;
1191 }
1192 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1193 {
1194 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1195 goto err;
1196 }
1197
1198 s->s3->tmp.ecdh=ecdh;
1199 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1200 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1201 (s->options & SSL_OP_SINGLE_ECDH_USE))
1202 {
1203 if(!EC_KEY_generate_key(ecdh))
1204 {
1205 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1206 goto err;
1207 }
1208 }
1209
1210 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1211 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1212 (EC_KEY_get0_private_key(ecdh) == NULL))
1213 {
1214 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1215 goto err;
1216 }
1217
1218 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1219 (EC_GROUP_get_degree(group) > 163))
1220 {
1221 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1222 goto err;
1223 }
1224
1225 /* XXX: For now, we only support ephemeral ECDH
1226 * keys over named (not generic) curves. For
1227 * supported named curves, curve_id is non-zero.
1228 */
1229 if ((curve_id =
1230 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1231 == 0)
1232 {
1233 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1234 goto err;
1235 }
1236
1237 /* Encode the public key.
1238 * First check the size of encoding and
1239 * allocate memory accordingly.
1240 */
1241 encodedlen = EC_POINT_point2oct(group,
1242 EC_KEY_get0_public_key(ecdh),
1243 POINT_CONVERSION_UNCOMPRESSED,
1244 NULL, 0, NULL);
1245
1246 encodedPoint = (unsigned char *)
1247 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1248 bn_ctx = BN_CTX_new();
1249 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1250 {
1251 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1252 goto err;
1253 }
1254
1255
1256 encodedlen = EC_POINT_point2oct(group,
1257 EC_KEY_get0_public_key(ecdh),
1258 POINT_CONVERSION_UNCOMPRESSED,
1259 encodedPoint, encodedlen, bn_ctx);
1260
1261 if (encodedlen == 0)
1262 {
1263 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1264 goto err;
1265 }
1266
1267 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1268
1269 /* XXX: For now, we only support named (not
1270 * generic) curves in ECDH ephemeral key exchanges.
1271 * In this situation, we need four additional bytes
1272 * to encode the entire ServerECDHParams
1273 * structure.
1274 */
1275 n = 4 + encodedlen;
1276
1277 /* We'll generate the serverKeyExchange message
1278 * explicitly so we can set these to NULLs
1279 */
1280 r[0]=NULL;
1281 r[1]=NULL;
1282 r[2]=NULL;
1283 r[3]=NULL;
1284 }
1285 else
1286 #endif /* !OPENSSL_NO_ECDH */
1287 #ifndef OPENSSL_NO_PSK
1288 if (type & SSL_kPSK)
1289 {
1290 /* reserve size for record length and PSK identity hint*/
1291 n+=2+strlen(s->ctx->psk_identity_hint);
1292 }
1293 else
1294 #endif /* !OPENSSL_NO_PSK */
1295 {
1296 al=SSL_AD_HANDSHAKE_FAILURE;
1297 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1298 goto f_err;
1299 }
1300 for (i=0; r[i] != NULL; i++)
1301 {
1302 nr[i]=BN_num_bytes(r[i]);
1303 n+=2+nr[i];
1304 }
1305
1306 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1307 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1308 {
1309 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1310 == NULL)
1311 {
1312 al=SSL_AD_DECODE_ERROR;
1313 goto f_err;
1314 }
1315 kn=EVP_PKEY_size(pkey);
1316 }
1317 else
1318 {
1319 pkey=NULL;
1320 kn=0;
1321 }
1322
1323 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1324 {
1325 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1326 goto err;
1327 }
1328 d=(unsigned char *)s->init_buf->data;
1329 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1330
1331 for (i=0; r[i] != NULL; i++)
1332 {
1333 s2n(nr[i],p);
1334 BN_bn2bin(r[i],p);
1335 p+=nr[i];
1336 }
1337
1338 #ifndef OPENSSL_NO_ECDH
1339 if (type & SSL_kEECDH)
1340 {
1341 /* XXX: For now, we only support named (not generic) curves.
1342 * In this situation, the serverKeyExchange message has:
1343 * [1 byte CurveType], [2 byte CurveName]
1344 * [1 byte length of encoded point], followed by
1345 * the actual encoded point itself
1346 */
1347 *p = NAMED_CURVE_TYPE;
1348 p += 1;
1349 *p = 0;
1350 p += 1;
1351 *p = curve_id;
1352 p += 1;
1353 *p = encodedlen;
1354 p += 1;
1355 memcpy((unsigned char*)p,
1356 (unsigned char *)encodedPoint,
1357 encodedlen);
1358 OPENSSL_free(encodedPoint);
1359 encodedPoint = NULL;
1360 p += encodedlen;
1361 }
1362 #endif
1363
1364 #ifndef OPENSSL_NO_PSK
1365 if (type & SSL_kPSK)
1366 {
1367 /* copy PSK identity hint */
1368 s2n(strlen(s->ctx->psk_identity_hint), p);
1369 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1370 p+=strlen(s->ctx->psk_identity_hint);
1371 }
1372 #endif
1373
1374 /* not anonymous */
1375 if (pkey != NULL)
1376 {
1377 /* n is the length of the params, they start at
1378 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1379 * at the end. */
1380 #ifndef OPENSSL_NO_RSA
1381 if (pkey->type == EVP_PKEY_RSA)
1382 {
1383 q=md_buf;
1384 j=0;
1385 for (num=2; num > 0; num--)
1386 {
1387 EVP_DigestInit_ex(&md_ctx,(num == 2)
1388 ?s->ctx->md5:s->ctx->sha1, NULL);
1389 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1390 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1391 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1392 EVP_DigestFinal_ex(&md_ctx,q,
1393 (unsigned int *)&i);
1394 q+=i;
1395 j+=i;
1396 }
1397 if (RSA_sign(NID_md5_sha1, md_buf, j,
1398 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1399 {
1400 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1401 goto err;
1402 }
1403 s2n(u,p);
1404 n+=u+2;
1405 }
1406 else
1407 #endif
1408 #if !defined(OPENSSL_NO_DSA)
1409 if (pkey->type == EVP_PKEY_DSA)
1410 {
1411 /* lets do DSS */
1412 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1413 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1414 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1415 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1416 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1417 (unsigned int *)&i,pkey))
1418 {
1419 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1420 goto err;
1421 }
1422 s2n(i,p);
1423 n+=i+2;
1424 }
1425 else
1426 #endif
1427 #if !defined(OPENSSL_NO_ECDSA)
1428 if (pkey->type == EVP_PKEY_EC)
1429 {
1430 /* let's do ECDSA */
1431 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1432 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1433 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1434 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1435 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1436 (unsigned int *)&i,pkey))
1437 {
1438 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1439 goto err;
1440 }
1441 s2n(i,p);
1442 n+=i+2;
1443 }
1444 else
1445 #endif
1446 {
1447 /* Is this error check actually needed? */
1448 al=SSL_AD_HANDSHAKE_FAILURE;
1449 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1450 goto f_err;
1451 }
1452 }
1453
1454 d = dtls1_set_message_header(s, d,
1455 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1456
1457 /* we should now have things packed up, so lets send
1458 * it off */
1459 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1460 s->init_off=0;
1461
1462 /* buffer the message to handle re-xmits */
1463 dtls1_buffer_message(s, 0);
1464 }
1465
1466 s->state = SSL3_ST_SW_KEY_EXCH_B;
1467 EVP_MD_CTX_cleanup(&md_ctx);
1468 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1469 f_err:
1470 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1471 err:
1472 #ifndef OPENSSL_NO_ECDH
1473 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1474 BN_CTX_free(bn_ctx);
1475 #endif
1476 EVP_MD_CTX_cleanup(&md_ctx);
1477 return(-1);
1478 }
1479
1480 int dtls1_send_certificate_request(SSL *s)
1481 {
1482 unsigned char *p,*d;
1483 int i,j,nl,off,n;
1484 STACK_OF(X509_NAME) *sk=NULL;
1485 X509_NAME *name;
1486 BUF_MEM *buf;
1487 unsigned int msg_len;
1488
1489 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1490 {
1491 buf=s->init_buf;
1492
1493 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1494
1495 /* get the list of acceptable cert types */
1496 p++;
1497 n=ssl3_get_req_cert_type(s,p);
1498 d[0]=n;
1499 p+=n;
1500 n++;
1501
1502 off=n;
1503 p+=2;
1504 n+=2;
1505
1506 sk=SSL_get_client_CA_list(s);
1507 nl=0;
1508 if (sk != NULL)
1509 {
1510 for (i=0; i<sk_X509_NAME_num(sk); i++)
1511 {
1512 name=sk_X509_NAME_value(sk,i);
1513 j=i2d_X509_NAME(name,NULL);
1514 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1515 {
1516 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1517 goto err;
1518 }
1519 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1520 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1521 {
1522 s2n(j,p);
1523 i2d_X509_NAME(name,&p);
1524 n+=2+j;
1525 nl+=2+j;
1526 }
1527 else
1528 {
1529 d=p;
1530 i2d_X509_NAME(name,&p);
1531 j-=2; s2n(j,d); j+=2;
1532 n+=j;
1533 nl+=j;
1534 }
1535 }
1536 }
1537 /* else no CA names */
1538 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1539 s2n(nl,p);
1540
1541 d=(unsigned char *)buf->data;
1542 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1543 l2n3(n,d);
1544 s2n(s->d1->handshake_write_seq,d);
1545 s->d1->handshake_write_seq++;
1546
1547 /* we should now have things packed up, so lets send
1548 * it off */
1549
1550 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1551 s->init_off=0;
1552 #ifdef NETSCAPE_HANG_BUG
1553 /* XXX: what to do about this? */
1554 p=(unsigned char *)s->init_buf->data + s->init_num;
1555
1556 /* do the header */
1557 *(p++)=SSL3_MT_SERVER_DONE;
1558 *(p++)=0;
1559 *(p++)=0;
1560 *(p++)=0;
1561 s->init_num += 4;
1562 #endif
1563
1564 /* XDTLS: set message header ? */
1565 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1566 dtls1_set_message_header(s, (void *)s->init_buf->data,
1567 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1568
1569 /* buffer the message to handle re-xmits */
1570 dtls1_buffer_message(s, 0);
1571
1572 s->state = SSL3_ST_SW_CERT_REQ_B;
1573 }
1574
1575 /* SSL3_ST_SW_CERT_REQ_B */
1576 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1577 err:
1578 return(-1);
1579 }
1580
1581 int dtls1_send_server_certificate(SSL *s)
1582 {
1583 unsigned long l;
1584 X509 *x;
1585
1586 if (s->state == SSL3_ST_SW_CERT_A)
1587 {
1588 x=ssl_get_server_send_cert(s);
1589 if (x == NULL)
1590 {
1591 /* VRS: allow null cert if auth == KRB5 */
1592 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1593 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1594 {
1595 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1596 return(0);
1597 }
1598 }
1599
1600 l=dtls1_output_cert_chain(s,x);
1601 s->state=SSL3_ST_SW_CERT_B;
1602 s->init_num=(int)l;
1603 s->init_off=0;
1604
1605 /* buffer the message to handle re-xmits */
1606 dtls1_buffer_message(s, 0);
1607 }
1608
1609 /* SSL3_ST_SW_CERT_B */
1610 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1611 }
1612
1613 #ifndef OPENSSL_NO_TLSEXT
1614 int dtls1_send_newsession_ticket(SSL *s)
1615 {
1616 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1617 {
1618 unsigned char *p, *senc, *macstart;
1619 int len, slen;
1620 unsigned int hlen, msg_len;
1621 EVP_CIPHER_CTX ctx;
1622 HMAC_CTX hctx;
1623 SSL_CTX *tctx = s->initial_ctx;
1624 unsigned char iv[EVP_MAX_IV_LENGTH];
1625 unsigned char key_name[16];
1626
1627 /* get session encoding length */
1628 slen = i2d_SSL_SESSION(s->session, NULL);
1629 /* Some length values are 16 bits, so forget it if session is
1630 * too long
1631 */
1632 if (slen > 0xFF00)
1633 return -1;
1634 /* Grow buffer if need be: the length calculation is as
1635 * follows 12 (DTLS handshake message header) +
1636 * 4 (ticket lifetime hint) + 2 (ticket length) +
1637 * 16 (key name) + max_iv_len (iv length) +
1638 * session_length + max_enc_block_size (max encrypted session
1639 * length) + max_md_size (HMAC).
1640 */
1641 if (!BUF_MEM_grow(s->init_buf,
1642 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1643 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1644 return -1;
1645 senc = OPENSSL_malloc(slen);
1646 if (!senc)
1647 return -1;
1648 p = senc;
1649 i2d_SSL_SESSION(s->session, &p);
1650
1651 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1652 EVP_CIPHER_CTX_init(&ctx);
1653 HMAC_CTX_init(&hctx);
1654 /* Initialize HMAC and cipher contexts. If callback present
1655 * it does all the work otherwise use generated values
1656 * from parent ctx.
1657 */
1658 if (tctx->tlsext_ticket_key_cb)
1659 {
1660 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1661 &hctx, 1) < 0)
1662 {
1663 OPENSSL_free(senc);
1664 return -1;
1665 }
1666 }
1667 else
1668 {
1669 RAND_pseudo_bytes(iv, 16);
1670 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1671 tctx->tlsext_tick_aes_key, iv);
1672 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1673 tlsext_tick_md(), NULL);
1674 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1675 }
1676 l2n(s->session->tlsext_tick_lifetime_hint, p);
1677 /* Skip ticket length for now */
1678 p += 2;
1679 /* Output key name */
1680 macstart = p;
1681 memcpy(p, key_name, 16);
1682 p += 16;
1683 /* output IV */
1684 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1685 p += EVP_CIPHER_CTX_iv_length(&ctx);
1686 /* Encrypt session data */
1687 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1688 p += len;
1689 EVP_EncryptFinal(&ctx, p, &len);
1690 p += len;
1691 EVP_CIPHER_CTX_cleanup(&ctx);
1692
1693 HMAC_Update(&hctx, macstart, p - macstart);
1694 HMAC_Final(&hctx, p, &hlen);
1695 HMAC_CTX_cleanup(&hctx);
1696
1697 p += hlen;
1698 /* Now write out lengths: p points to end of data written */
1699 /* Total length */
1700 len = p - (unsigned char *)(s->init_buf->data);
1701 /* Ticket length */
1702 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1703 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1704
1705 /* number of bytes to write */
1706 s->init_num= len;
1707 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1708 s->init_off=0;
1709 OPENSSL_free(senc);
1710
1711 /* XDTLS: set message header ? */
1712 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1713 dtls1_set_message_header(s, (void *)s->init_buf->data,
1714 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1715
1716 /* buffer the message to handle re-xmits */
1717 dtls1_buffer_message(s, 0);
1718 }
1719
1720 /* SSL3_ST_SW_SESSION_TICKET_B */
1721 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1722 }
1723 #endif
Tomato firmware and modifications.