3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
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.
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).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
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)"
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
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.]
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>
129 static const SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
132 static const SSL_METHOD *dtls1_get_server_method(int ver)
134 if (ver == DTLS1_VERSION)
135 return(DTLSv1_server_method());
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
142 ssl_undefined_function,
143 dtls1_get_server_method)
145 int dtls1_accept(SSL *s)
148 unsigned long Time=(unsigned long)time(NULL);
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
152 int new_state,state,skip=0;
154 #ifndef OPENSSL_NO_SCTP
155 unsigned char sctpauthkey[64];
156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
159 RAND_add(&Time,sizeof(Time),0);
163 if (s->info_callback != NULL)
165 else if (s->ctx->info_callback != NULL)
166 cb=s->ctx->info_callback;
168 listen = s->d1->listen;
170 /* init things to blank */
172 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
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.
180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
185 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
195 case SSL_ST_RENEGOTIATE:
197 /* s->state=SSL_ST_ACCEPT; */
201 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
202 case SSL_ST_OK|SSL_ST_ACCEPT:
205 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
207 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
209 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
212 s->type=SSL_ST_ACCEPT;
214 if (s->init_buf == NULL)
216 if ((buf=BUF_MEM_new()) == NULL)
221 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
229 if (!ssl3_setup_buffers(s))
237 if (s->state != SSL_ST_RENEGOTIATE)
239 /* Ok, we now need to push on a buffering BIO so that
240 * the output is sent in a way that TCP likes :-)
241 * ...but not with SCTP :-)
243 #ifndef OPENSSL_NO_SCTP
244 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
246 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
248 ssl3_init_finished_mac(s);
249 s->state=SSL3_ST_SR_CLNT_HELLO_A;
250 s->ctx->stats.sess_accept++;
254 /* s->state == SSL_ST_RENEGOTIATE,
255 * we will just send a HelloRequest */
256 s->ctx->stats.sess_accept_renegotiate++;
257 s->state=SSL3_ST_SW_HELLO_REQ_A;
262 case SSL3_ST_SW_HELLO_REQ_A:
263 case SSL3_ST_SW_HELLO_REQ_B:
266 dtls1_start_timer(s);
267 ret=dtls1_send_hello_request(s);
268 if (ret <= 0) goto end;
269 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
270 s->state=SSL3_ST_SW_FLUSH;
273 ssl3_init_finished_mac(s);
276 case SSL3_ST_SW_HELLO_REQ_C:
280 case SSL3_ST_SR_CLNT_HELLO_A:
281 case SSL3_ST_SR_CLNT_HELLO_B:
282 case SSL3_ST_SR_CLNT_HELLO_C:
285 ret=ssl3_get_client_hello(s);
286 if (ret <= 0) goto end;
289 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
290 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
292 s->state = SSL3_ST_SW_SRVR_HELLO_A;
296 /* Reflect ClientHello sequence to remain stateless while listening */
299 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
302 /* If we're just listening, stop here */
303 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
307 /* Set expected sequence numbers
308 * to continue the handshake.
310 s->d1->handshake_read_seq = 2;
311 s->d1->handshake_write_seq = 1;
312 s->d1->next_handshake_write_seq = 1;
318 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
319 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
321 ret = dtls1_send_hello_verify_request(s);
322 if ( ret <= 0) goto end;
323 s->state=SSL3_ST_SW_FLUSH;
324 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
326 /* HelloVerifyRequest resets Finished MAC */
327 if (s->version != DTLS1_BAD_VER)
328 ssl3_init_finished_mac(s);
331 #ifndef OPENSSL_NO_SCTP
332 case DTLS1_SCTP_ST_SR_READ_SOCK:
334 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
336 s->s3->in_read_app_data=2;
337 s->rwstate=SSL_READING;
338 BIO_clear_retry_flags(SSL_get_rbio(s));
339 BIO_set_retry_read(SSL_get_rbio(s));
344 s->state=SSL3_ST_SR_FINISHED_A;
347 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
348 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
349 if (ret < 0) goto end;
353 if (s->d1->next_state != SSL_ST_OK)
355 s->s3->in_read_app_data=2;
356 s->rwstate=SSL_READING;
357 BIO_clear_retry_flags(SSL_get_rbio(s));
358 BIO_set_retry_read(SSL_get_rbio(s));
364 s->state=s->d1->next_state;
368 case SSL3_ST_SW_SRVR_HELLO_A:
369 case SSL3_ST_SW_SRVR_HELLO_B:
371 dtls1_start_timer(s);
372 ret=dtls1_send_server_hello(s);
373 if (ret <= 0) goto end;
377 #ifndef OPENSSL_NO_SCTP
378 /* Add new shared key for SCTP-Auth,
379 * will be ignored if no SCTP used.
381 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
382 DTLS1_SCTP_AUTH_LABEL);
384 SSL_export_keying_material(s, sctpauthkey,
385 sizeof(sctpauthkey), labelbuffer,
386 sizeof(labelbuffer), NULL, 0, 0);
388 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
389 sizeof(sctpauthkey), sctpauthkey);
391 #ifndef OPENSSL_NO_TLSEXT
392 if (s->tlsext_ticket_expected)
393 s->state=SSL3_ST_SW_SESSION_TICKET_A;
395 s->state=SSL3_ST_SW_CHANGE_A;
397 s->state=SSL3_ST_SW_CHANGE_A;
401 s->state=SSL3_ST_SW_CERT_A;
405 case SSL3_ST_SW_CERT_A:
406 case SSL3_ST_SW_CERT_B:
407 /* Check if it is anon DH or normal PSK */
408 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
409 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
411 dtls1_start_timer(s);
412 ret=dtls1_send_server_certificate(s);
413 if (ret <= 0) goto end;
414 #ifndef OPENSSL_NO_TLSEXT
415 if (s->tlsext_status_expected)
416 s->state=SSL3_ST_SW_CERT_STATUS_A;
418 s->state=SSL3_ST_SW_KEY_EXCH_A;
423 s->state=SSL3_ST_SW_KEY_EXCH_A;
430 s->state=SSL3_ST_SW_KEY_EXCH_A;
435 case SSL3_ST_SW_KEY_EXCH_A:
436 case SSL3_ST_SW_KEY_EXCH_B:
437 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
439 /* clear this, it may get reset by
440 * send_server_key_exchange */
441 if ((s->options & SSL_OP_EPHEMERAL_RSA)
442 #ifndef OPENSSL_NO_KRB5
443 && !(alg_k & SSL_kKRB5)
444 #endif /* OPENSSL_NO_KRB5 */
446 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
447 * even when forbidden by protocol specs
448 * (handshake may fail as clients are not required to
449 * be able to handle this) */
450 s->s3->tmp.use_rsa_tmp=1;
452 s->s3->tmp.use_rsa_tmp=0;
454 /* only send if a DH key exchange or
455 * RSA but we have a sign only certificate */
456 if (s->s3->tmp.use_rsa_tmp
457 /* PSK: send ServerKeyExchange if PSK identity
458 * hint if provided */
459 #ifndef OPENSSL_NO_PSK
460 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
462 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
463 || (alg_k & SSL_kEECDH)
464 || ((alg_k & SSL_kRSA)
465 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
466 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
467 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
473 dtls1_start_timer(s);
474 ret=dtls1_send_server_key_exchange(s);
475 if (ret <= 0) goto end;
480 s->state=SSL3_ST_SW_CERT_REQ_A;
484 case SSL3_ST_SW_CERT_REQ_A:
485 case SSL3_ST_SW_CERT_REQ_B:
486 if (/* don't request cert unless asked for it: */
487 !(s->verify_mode & SSL_VERIFY_PEER) ||
488 /* if SSL_VERIFY_CLIENT_ONCE is set,
489 * don't request cert during re-negotiation: */
490 ((s->session->peer != NULL) &&
491 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
492 /* never request cert in anonymous ciphersuites
493 * (see section "Certificate request" in SSL 3 drafts
494 * and in RFC 2246): */
495 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
496 /* ... except when the application insists on verification
497 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
498 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
499 /* never request cert in Kerberos ciphersuites */
500 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
501 /* With normal PSK Certificates and
502 * Certificate Requests are omitted */
503 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
505 /* no cert request */
507 s->s3->tmp.cert_request=0;
508 s->state=SSL3_ST_SW_SRVR_DONE_A;
509 #ifndef OPENSSL_NO_SCTP
510 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
512 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
513 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
519 s->s3->tmp.cert_request=1;
520 dtls1_start_timer(s);
521 ret=dtls1_send_certificate_request(s);
522 if (ret <= 0) goto end;
523 #ifndef NETSCAPE_HANG_BUG
524 s->state=SSL3_ST_SW_SRVR_DONE_A;
525 #ifndef OPENSSL_NO_SCTP
526 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
528 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
529 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
533 s->state=SSL3_ST_SW_FLUSH;
534 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
535 #ifndef OPENSSL_NO_SCTP
536 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
538 s->d1->next_state = s->s3->tmp.next_state;
539 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
547 case SSL3_ST_SW_SRVR_DONE_A:
548 case SSL3_ST_SW_SRVR_DONE_B:
549 dtls1_start_timer(s);
550 ret=dtls1_send_server_done(s);
551 if (ret <= 0) goto end;
552 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
553 s->state=SSL3_ST_SW_FLUSH;
557 case SSL3_ST_SW_FLUSH:
558 s->rwstate=SSL_WRITING;
559 if (BIO_flush(s->wbio) <= 0)
561 /* If the write error was fatal, stop trying */
562 if (!BIO_should_retry(s->wbio))
564 s->rwstate=SSL_NOTHING;
565 s->state=s->s3->tmp.next_state;
571 s->rwstate=SSL_NOTHING;
572 s->state=s->s3->tmp.next_state;
575 case SSL3_ST_SR_CERT_A:
576 case SSL3_ST_SR_CERT_B:
577 /* Check for second client hello (MS SGC) */
578 ret = ssl3_check_client_hello(s);
583 s->state = SSL3_ST_SR_CLNT_HELLO_C;
585 /* could be sent for a DH cert, even if we
586 * have not asked for it :-) */
587 ret=ssl3_get_client_certificate(s);
588 if (ret <= 0) goto end;
591 s->state=SSL3_ST_SR_KEY_EXCH_A;
595 case SSL3_ST_SR_KEY_EXCH_A:
596 case SSL3_ST_SR_KEY_EXCH_B:
597 ret=ssl3_get_client_key_exchange(s);
598 if (ret <= 0) goto end;
600 #ifndef OPENSSL_NO_SCTP
601 /* Add new shared key for SCTP-Auth,
602 * will be ignored if no SCTP used.
604 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
605 DTLS1_SCTP_AUTH_LABEL);
607 SSL_export_keying_material(s, sctpauthkey,
608 sizeof(sctpauthkey), labelbuffer,
609 sizeof(labelbuffer), NULL, 0, 0);
611 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
612 sizeof(sctpauthkey), sctpauthkey);
615 s->state=SSL3_ST_SR_CERT_VRFY_A;
620 /* For the ECDH ciphersuites when
621 * the client sends its ECDH pub key in
622 * a certificate, the CertificateVerify
623 * message is not sent.
625 s->state=SSL3_ST_SR_FINISHED_A;
630 s->state=SSL3_ST_SR_CERT_VRFY_A;
633 /* We need to get hashes here so if there is
634 * a client cert, it can be verified */
635 s->method->ssl3_enc->cert_verify_mac(s,
637 &(s->s3->tmp.cert_verify_md[0]));
638 s->method->ssl3_enc->cert_verify_mac(s,
640 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
644 case SSL3_ST_SR_CERT_VRFY_A:
645 case SSL3_ST_SR_CERT_VRFY_B:
647 s->d1->change_cipher_spec_ok = 1;
648 /* we should decide if we expected this one */
649 ret=ssl3_get_cert_verify(s);
650 if (ret <= 0) goto end;
652 #ifndef OPENSSL_NO_SCTP
653 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
654 state == SSL_ST_RENEGOTIATE)
655 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
658 s->state=SSL3_ST_SR_FINISHED_A;
662 case SSL3_ST_SR_FINISHED_A:
663 case SSL3_ST_SR_FINISHED_B:
664 s->d1->change_cipher_spec_ok = 1;
665 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
666 SSL3_ST_SR_FINISHED_B);
667 if (ret <= 0) goto end;
671 #ifndef OPENSSL_NO_TLSEXT
672 else if (s->tlsext_ticket_expected)
673 s->state=SSL3_ST_SW_SESSION_TICKET_A;
676 s->state=SSL3_ST_SW_CHANGE_A;
680 #ifndef OPENSSL_NO_TLSEXT
681 case SSL3_ST_SW_SESSION_TICKET_A:
682 case SSL3_ST_SW_SESSION_TICKET_B:
683 ret=dtls1_send_newsession_ticket(s);
684 if (ret <= 0) goto end;
685 s->state=SSL3_ST_SW_CHANGE_A;
689 case SSL3_ST_SW_CERT_STATUS_A:
690 case SSL3_ST_SW_CERT_STATUS_B:
691 ret=ssl3_send_cert_status(s);
692 if (ret <= 0) goto end;
693 s->state=SSL3_ST_SW_KEY_EXCH_A;
699 case SSL3_ST_SW_CHANGE_A:
700 case SSL3_ST_SW_CHANGE_B:
702 s->session->cipher=s->s3->tmp.new_cipher;
703 if (!s->method->ssl3_enc->setup_key_block(s))
704 { ret= -1; goto end; }
706 ret=dtls1_send_change_cipher_spec(s,
707 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
709 if (ret <= 0) goto end;
711 #ifndef OPENSSL_NO_SCTP
712 /* Change to new shared key of SCTP-Auth,
713 * will be ignored if no SCTP used.
715 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
718 s->state=SSL3_ST_SW_FINISHED_A;
721 if (!s->method->ssl3_enc->change_cipher_state(s,
722 SSL3_CHANGE_CIPHER_SERVER_WRITE))
728 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
731 case SSL3_ST_SW_FINISHED_A:
732 case SSL3_ST_SW_FINISHED_B:
733 ret=dtls1_send_finished(s,
734 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
735 s->method->ssl3_enc->server_finished_label,
736 s->method->ssl3_enc->server_finished_label_len);
737 if (ret <= 0) goto end;
738 s->state=SSL3_ST_SW_FLUSH;
740 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
743 s->s3->tmp.next_state=SSL_ST_OK;
744 #ifndef OPENSSL_NO_SCTP
745 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
747 s->d1->next_state = s->s3->tmp.next_state;
748 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
756 /* clean a few things up */
757 ssl3_cleanup_key_block(s);
760 BUF_MEM_free(s->init_buf);
764 /* remove buffering on output */
765 ssl_free_wbio_buffer(s);
769 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
774 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
776 s->ctx->stats.sess_accept_good++;
778 s->handshake_func=dtls1_accept;
780 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
785 /* done handshaking, next message is client hello */
786 s->d1->handshake_read_seq = 0;
787 /* next message is server hello */
788 s->d1->handshake_write_seq = 0;
789 s->d1->next_handshake_write_seq = 0;
794 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
800 if (!s->s3->tmp.reuse_message && !skip)
804 if ((ret=BIO_flush(s->wbio)) <= 0)
809 if ((cb != NULL) && (s->state != state))
813 cb(s,SSL_CB_ACCEPT_LOOP,1);
820 /* BIO_flush(s->wbio); */
823 #ifndef OPENSSL_NO_SCTP
824 /* Notify SCTP BIO socket to leave handshake
825 * mode and prevent stream identifier other
826 * than 0. Will be ignored if no SCTP is used.
828 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
832 cb(s,SSL_CB_ACCEPT_EXIT,ret);
836 int dtls1_send_hello_request(SSL *s)
840 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
842 p=(unsigned char *)s->init_buf->data;
843 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
845 s->state=SSL3_ST_SW_HELLO_REQ_B;
846 /* number of bytes to write */
847 s->init_num=DTLS1_HM_HEADER_LENGTH;
850 /* no need to buffer this message, since there are no retransmit
854 /* SSL3_ST_SW_HELLO_REQ_B */
855 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
858 int dtls1_send_hello_verify_request(SSL *s)
860 unsigned int msg_len;
861 unsigned char *msg, *buf, *p;
863 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
865 buf = (unsigned char *)s->init_buf->data;
867 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
868 *(p++) = s->version >> 8;
869 *(p++) = s->version & 0xFF;
871 if (s->ctx->app_gen_cookie_cb == NULL ||
872 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
873 &(s->d1->cookie_len)) == 0)
875 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
879 *(p++) = (unsigned char) s->d1->cookie_len;
880 memcpy(p, s->d1->cookie, s->d1->cookie_len);
881 p += s->d1->cookie_len;
884 dtls1_set_message_header(s, buf,
885 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
887 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
888 /* number of bytes to write */
893 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
894 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
897 int dtls1_send_server_hello(SSL *s)
903 unsigned long l,Time;
905 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
907 buf=(unsigned char *)s->init_buf->data;
908 p=s->s3->server_random;
909 Time=(unsigned long)time(NULL); /* Time */
911 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
912 /* Do the message type and length last */
913 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
915 *(p++)=s->version>>8;
916 *(p++)=s->version&0xff;
919 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
922 /* now in theory we have 3 options to sending back the
923 * session id. If it is a re-use, we send back the
924 * old session-id, if it is a new session, we send
925 * back the new session-id or we send back a 0 length
926 * session-id if we want it to be single use.
927 * Currently I will not implement the '0' length session-id
928 * 12-Jan-98 - I'll now support the '0' length stuff.
930 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
931 s->session->session_id_length=0;
933 sl=s->session->session_id_length;
934 if (sl > sizeof s->session->session_id)
936 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
940 memcpy(p,s->session->session_id,sl);
944 if (s->s3->tmp.new_cipher == NULL)
946 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
949 /* put the compression method */
950 #ifdef OPENSSL_NO_COMP
953 if (s->s3->tmp.new_compression == NULL)
956 *(p++)=s->s3->tmp.new_compression->id;
959 #ifndef OPENSSL_NO_TLSEXT
960 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
962 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
971 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
973 s->state=SSL3_ST_SW_SRVR_HELLO_B;
974 /* number of bytes to write */
978 /* buffer the message to handle re-xmits */
979 dtls1_buffer_message(s, 0);
982 /* SSL3_ST_SW_SRVR_HELLO_B */
983 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
986 int dtls1_send_server_done(SSL *s)
990 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
992 p=(unsigned char *)s->init_buf->data;
995 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
997 s->state=SSL3_ST_SW_SRVR_DONE_B;
998 /* number of bytes to write */
999 s->init_num=DTLS1_HM_HEADER_LENGTH;
1002 /* buffer the message to handle re-xmits */
1003 dtls1_buffer_message(s, 0);
1006 /* SSL3_ST_SW_SRVR_DONE_B */
1007 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1010 int dtls1_send_server_key_exchange(SSL *s)
1012 #ifndef OPENSSL_NO_RSA
1016 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1019 #ifndef OPENSSL_NO_DH
1022 #ifndef OPENSSL_NO_ECDH
1023 EC_KEY *ecdh=NULL, *ecdhp;
1024 unsigned char *encodedPoint = NULL;
1027 BN_CTX *bn_ctx = NULL;
1030 unsigned char *p,*d;
1040 EVP_MD_CTX_init(&md_ctx);
1041 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1043 type=s->s3->tmp.new_cipher->algorithm_mkey;
1048 r[0]=r[1]=r[2]=r[3]=NULL;
1050 #ifndef OPENSSL_NO_RSA
1051 if (type & SSL_kRSA)
1054 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1056 rsa=s->cert->rsa_tmp_cb(s,
1057 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1058 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1061 al=SSL_AD_HANDSHAKE_FAILURE;
1062 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1070 al=SSL_AD_HANDSHAKE_FAILURE;
1071 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1076 s->s3->tmp.use_rsa_tmp=1;
1080 #ifndef OPENSSL_NO_DH
1081 if (type & SSL_kEDH)
1084 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1085 dhp=s->cert->dh_tmp_cb(s,
1086 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1087 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1090 al=SSL_AD_HANDSHAKE_FAILURE;
1091 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1095 if (s->s3->tmp.dh != NULL)
1098 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1102 if ((dh=DHparams_dup(dhp)) == NULL)
1104 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1109 if ((dhp->pub_key == NULL ||
1110 dhp->priv_key == NULL ||
1111 (s->options & SSL_OP_SINGLE_DH_USE)))
1113 if(!DH_generate_key(dh))
1115 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1122 dh->pub_key=BN_dup(dhp->pub_key);
1123 dh->priv_key=BN_dup(dhp->priv_key);
1124 if ((dh->pub_key == NULL) ||
1125 (dh->priv_key == NULL))
1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1137 #ifndef OPENSSL_NO_ECDH
1138 if (type & SSL_kEECDH)
1140 const EC_GROUP *group;
1142 ecdhp=cert->ecdh_tmp;
1143 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1145 ecdhp=s->cert->ecdh_tmp_cb(s,
1146 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1147 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1151 al=SSL_AD_HANDSHAKE_FAILURE;
1152 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1156 if (s->s3->tmp.ecdh != NULL)
1158 EC_KEY_free(s->s3->tmp.ecdh);
1159 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1163 /* Duplicate the ECDH structure. */
1166 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1169 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1171 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1175 s->s3->tmp.ecdh=ecdh;
1176 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1177 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1178 (s->options & SSL_OP_SINGLE_ECDH_USE))
1180 if(!EC_KEY_generate_key(ecdh))
1182 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1187 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1188 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1189 (EC_KEY_get0_private_key(ecdh) == NULL))
1191 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1195 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1196 (EC_GROUP_get_degree(group) > 163))
1198 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1202 /* XXX: For now, we only support ephemeral ECDH
1203 * keys over named (not generic) curves. For
1204 * supported named curves, curve_id is non-zero.
1207 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1210 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1214 /* Encode the public key.
1215 * First check the size of encoding and
1216 * allocate memory accordingly.
1218 encodedlen = EC_POINT_point2oct(group,
1219 EC_KEY_get0_public_key(ecdh),
1220 POINT_CONVERSION_UNCOMPRESSED,
1223 encodedPoint = (unsigned char *)
1224 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1225 bn_ctx = BN_CTX_new();
1226 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1228 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1233 encodedlen = EC_POINT_point2oct(group,
1234 EC_KEY_get0_public_key(ecdh),
1235 POINT_CONVERSION_UNCOMPRESSED,
1236 encodedPoint, encodedlen, bn_ctx);
1238 if (encodedlen == 0)
1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1244 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1246 /* XXX: For now, we only support named (not
1247 * generic) curves in ECDH ephemeral key exchanges.
1248 * In this situation, we need four additional bytes
1249 * to encode the entire ServerECDHParams
1254 /* We'll generate the serverKeyExchange message
1255 * explicitly so we can set these to NULLs
1263 #endif /* !OPENSSL_NO_ECDH */
1264 #ifndef OPENSSL_NO_PSK
1265 if (type & SSL_kPSK)
1267 /* reserve size for record length and PSK identity hint*/
1268 n+=2+strlen(s->ctx->psk_identity_hint);
1271 #endif /* !OPENSSL_NO_PSK */
1273 al=SSL_AD_HANDSHAKE_FAILURE;
1274 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1277 for (i=0; r[i] != NULL; i++)
1279 nr[i]=BN_num_bytes(r[i]);
1283 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1284 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1286 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1289 al=SSL_AD_DECODE_ERROR;
1292 kn=EVP_PKEY_size(pkey);
1300 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1302 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1305 d=(unsigned char *)s->init_buf->data;
1306 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1308 for (i=0; r[i] != NULL; i++)
1315 #ifndef OPENSSL_NO_ECDH
1316 if (type & SSL_kEECDH)
1318 /* XXX: For now, we only support named (not generic) curves.
1319 * In this situation, the serverKeyExchange message has:
1320 * [1 byte CurveType], [2 byte CurveName]
1321 * [1 byte length of encoded point], followed by
1322 * the actual encoded point itself
1324 *p = NAMED_CURVE_TYPE;
1332 memcpy((unsigned char*)p,
1333 (unsigned char *)encodedPoint,
1335 OPENSSL_free(encodedPoint);
1340 #ifndef OPENSSL_NO_PSK
1341 if (type & SSL_kPSK)
1343 /* copy PSK identity hint */
1344 s2n(strlen(s->ctx->psk_identity_hint), p);
1345 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1346 p+=strlen(s->ctx->psk_identity_hint);
1353 /* n is the length of the params, they start at
1354 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1356 #ifndef OPENSSL_NO_RSA
1357 if (pkey->type == EVP_PKEY_RSA)
1361 for (num=2; num > 0; num--)
1363 EVP_DigestInit_ex(&md_ctx,(num == 2)
1364 ?s->ctx->md5:s->ctx->sha1, NULL);
1365 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1366 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1367 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1368 EVP_DigestFinal_ex(&md_ctx,q,
1369 (unsigned int *)&i);
1373 if (RSA_sign(NID_md5_sha1, md_buf, j,
1374 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1376 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1384 #if !defined(OPENSSL_NO_DSA)
1385 if (pkey->type == EVP_PKEY_DSA)
1388 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1389 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1390 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1391 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1392 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1393 (unsigned int *)&i,pkey))
1395 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1403 #if !defined(OPENSSL_NO_ECDSA)
1404 if (pkey->type == EVP_PKEY_EC)
1406 /* let's do ECDSA */
1407 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1408 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1409 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1410 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1411 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1412 (unsigned int *)&i,pkey))
1414 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1423 /* Is this error check actually needed? */
1424 al=SSL_AD_HANDSHAKE_FAILURE;
1425 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1430 d = dtls1_set_message_header(s, d,
1431 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1433 /* we should now have things packed up, so lets send
1435 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1438 /* buffer the message to handle re-xmits */
1439 dtls1_buffer_message(s, 0);
1442 s->state = SSL3_ST_SW_KEY_EXCH_B;
1443 EVP_MD_CTX_cleanup(&md_ctx);
1444 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1446 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1448 #ifndef OPENSSL_NO_ECDH
1449 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1450 BN_CTX_free(bn_ctx);
1452 EVP_MD_CTX_cleanup(&md_ctx);
1456 int dtls1_send_certificate_request(SSL *s)
1458 unsigned char *p,*d;
1460 STACK_OF(X509_NAME) *sk=NULL;
1463 unsigned int msg_len;
1465 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1469 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1471 /* get the list of acceptable cert types */
1473 n=ssl3_get_req_cert_type(s,p);
1482 sk=SSL_get_client_CA_list(s);
1486 for (i=0; i<sk_X509_NAME_num(sk); i++)
1488 name=sk_X509_NAME_value(sk,i);
1489 j=i2d_X509_NAME(name,NULL);
1490 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1492 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1495 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1496 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1499 i2d_X509_NAME(name,&p);
1506 i2d_X509_NAME(name,&p);
1507 j-=2; s2n(j,d); j+=2;
1513 /* else no CA names */
1514 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1517 d=(unsigned char *)buf->data;
1518 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1520 s2n(s->d1->handshake_write_seq,d);
1521 s->d1->handshake_write_seq++;
1523 /* we should now have things packed up, so lets send
1526 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1528 #ifdef NETSCAPE_HANG_BUG
1529 /* XXX: what to do about this? */
1530 p=(unsigned char *)s->init_buf->data + s->init_num;
1533 *(p++)=SSL3_MT_SERVER_DONE;
1540 /* XDTLS: set message header ? */
1541 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1542 dtls1_set_message_header(s, (void *)s->init_buf->data,
1543 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1545 /* buffer the message to handle re-xmits */
1546 dtls1_buffer_message(s, 0);
1548 s->state = SSL3_ST_SW_CERT_REQ_B;
1551 /* SSL3_ST_SW_CERT_REQ_B */
1552 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1557 int dtls1_send_server_certificate(SSL *s)
1562 if (s->state == SSL3_ST_SW_CERT_A)
1564 x=ssl_get_server_send_cert(s);
1567 /* VRS: allow null cert if auth == KRB5 */
1568 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1569 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1571 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1576 l=dtls1_output_cert_chain(s,x);
1577 s->state=SSL3_ST_SW_CERT_B;
1581 /* buffer the message to handle re-xmits */
1582 dtls1_buffer_message(s, 0);
1585 /* SSL3_ST_SW_CERT_B */
1586 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1589 #ifndef OPENSSL_NO_TLSEXT
1590 int dtls1_send_newsession_ticket(SSL *s)
1592 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1594 unsigned char *p, *senc, *macstart;
1596 unsigned int hlen, msg_len;
1599 SSL_CTX *tctx = s->initial_ctx;
1600 unsigned char iv[EVP_MAX_IV_LENGTH];
1601 unsigned char key_name[16];
1603 /* get session encoding length */
1604 slen = i2d_SSL_SESSION(s->session, NULL);
1605 /* Some length values are 16 bits, so forget it if session is
1610 /* Grow buffer if need be: the length calculation is as
1611 * follows 12 (DTLS handshake message header) +
1612 * 4 (ticket lifetime hint) + 2 (ticket length) +
1613 * 16 (key name) + max_iv_len (iv length) +
1614 * session_length + max_enc_block_size (max encrypted session
1615 * length) + max_md_size (HMAC).
1617 if (!BUF_MEM_grow(s->init_buf,
1618 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1619 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1621 senc = OPENSSL_malloc(slen);
1625 i2d_SSL_SESSION(s->session, &p);
1627 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1628 EVP_CIPHER_CTX_init(&ctx);
1629 HMAC_CTX_init(&hctx);
1630 /* Initialize HMAC and cipher contexts. If callback present
1631 * it does all the work otherwise use generated values
1634 if (tctx->tlsext_ticket_key_cb)
1636 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1645 RAND_pseudo_bytes(iv, 16);
1646 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1647 tctx->tlsext_tick_aes_key, iv);
1648 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1649 tlsext_tick_md(), NULL);
1650 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1652 l2n(s->session->tlsext_tick_lifetime_hint, p);
1653 /* Skip ticket length for now */
1655 /* Output key name */
1657 memcpy(p, key_name, 16);
1660 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1661 p += EVP_CIPHER_CTX_iv_length(&ctx);
1662 /* Encrypt session data */
1663 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1665 EVP_EncryptFinal(&ctx, p, &len);
1667 EVP_CIPHER_CTX_cleanup(&ctx);
1669 HMAC_Update(&hctx, macstart, p - macstart);
1670 HMAC_Final(&hctx, p, &hlen);
1671 HMAC_CTX_cleanup(&hctx);
1674 /* Now write out lengths: p points to end of data written */
1676 len = p - (unsigned char *)(s->init_buf->data);
1678 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1679 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1681 /* number of bytes to write */
1683 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1687 /* XDTLS: set message header ? */
1688 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1689 dtls1_set_message_header(s, (void *)s->init_buf->data,
1690 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1692 /* buffer the message to handle re-xmits */
1693 dtls1_buffer_message(s, 0);
1696 /* SSL3_ST_SW_SESSION_TICKET_B */
1697 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));