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);
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.
194 if (s->tlsext_hb_pending)
197 s->tlsext_hb_pending = 0;
208 case SSL_ST_RENEGOTIATE:
210 /* s->state=SSL_ST_ACCEPT; */
214 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
215 case SSL_ST_OK|SSL_ST_ACCEPT:
218 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
220 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
222 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
225 s->type=SSL_ST_ACCEPT;
227 if (s->init_buf == NULL)
229 if ((buf=BUF_MEM_new()) == NULL)
234 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
242 if (!ssl3_setup_buffers(s))
250 if (s->state != SSL_ST_RENEGOTIATE)
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 :-)
256 #ifndef OPENSSL_NO_SCTP
257 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
259 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
261 ssl3_init_finished_mac(s);
262 s->state=SSL3_ST_SR_CLNT_HELLO_A;
263 s->ctx->stats.sess_accept++;
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;
275 case SSL3_ST_SW_HELLO_REQ_A:
276 case SSL3_ST_SW_HELLO_REQ_B:
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;
287 ssl3_init_finished_mac(s);
290 case SSL3_ST_SW_HELLO_REQ_C:
294 case SSL3_ST_SR_CLNT_HELLO_A:
295 case SSL3_ST_SR_CLNT_HELLO_B:
296 case SSL3_ST_SR_CLNT_HELLO_C:
299 ret=ssl3_get_client_hello(s);
300 if (ret <= 0) goto end;
303 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
304 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
306 s->state = SSL3_ST_SW_SRVR_HELLO_A;
310 /* Reflect ClientHello sequence to remain stateless while listening */
313 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
316 /* If we're just listening, stop here */
317 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
321 /* Set expected sequence numbers
322 * to continue the handshake.
324 s->d1->handshake_read_seq = 2;
325 s->d1->handshake_write_seq = 1;
326 s->d1->next_handshake_write_seq = 1;
332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
333 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
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;
340 /* HelloVerifyRequest resets Finished MAC */
341 if (s->version != DTLS1_BAD_VER)
342 ssl3_init_finished_mac(s);
345 #ifndef OPENSSL_NO_SCTP
346 case DTLS1_SCTP_ST_SR_READ_SOCK:
348 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
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));
358 s->state=SSL3_ST_SR_FINISHED_A;
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;
367 if (s->d1->next_state != SSL_ST_OK)
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));
378 s->state=s->d1->next_state;
382 case SSL3_ST_SW_SRVR_HELLO_A:
383 case SSL3_ST_SW_SRVR_HELLO_B:
385 dtls1_start_timer(s);
386 ret=dtls1_send_server_hello(s);
387 if (ret <= 0) goto end;
391 #ifndef OPENSSL_NO_SCTP
392 /* Add new shared key for SCTP-Auth,
393 * will be ignored if no SCTP used.
395 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
396 DTLS1_SCTP_AUTH_LABEL);
398 SSL_export_keying_material(s, sctpauthkey,
399 sizeof(sctpauthkey), labelbuffer,
400 sizeof(labelbuffer), NULL, 0, 0);
402 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
403 sizeof(sctpauthkey), sctpauthkey);
405 #ifndef OPENSSL_NO_TLSEXT
406 if (s->tlsext_ticket_expected)
407 s->state=SSL3_ST_SW_SESSION_TICKET_A;
409 s->state=SSL3_ST_SW_CHANGE_A;
411 s->state=SSL3_ST_SW_CHANGE_A;
415 s->state=SSL3_ST_SW_CERT_A;
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))
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;
432 s->state=SSL3_ST_SW_KEY_EXCH_A;
437 s->state=SSL3_ST_SW_KEY_EXCH_A;
444 s->state=SSL3_ST_SW_KEY_EXCH_A;
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;
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 */
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;
466 s->s3->tmp.use_rsa_tmp=0;
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)
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)
487 dtls1_start_timer(s);
488 ret=dtls1_send_server_key_exchange(s);
489 if (ret <= 0) goto end;
494 s->state=SSL3_ST_SW_CERT_REQ_A;
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))
519 /* no cert request */
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)))
526 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
527 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
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)))
542 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
543 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
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)))
552 s->d1->next_state = s->s3->tmp.next_state;
553 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
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;
571 case SSL3_ST_SW_FLUSH:
572 s->rwstate=SSL_WRITING;
573 if (BIO_flush(s->wbio) <= 0)
575 /* If the write error was fatal, stop trying */
576 if (!BIO_should_retry(s->wbio))
578 s->rwstate=SSL_NOTHING;
579 s->state=s->s3->tmp.next_state;
585 s->rwstate=SSL_NOTHING;
586 s->state=s->s3->tmp.next_state;
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);
598 s->state = SSL3_ST_SR_CLNT_HELLO_C;
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;
606 s->state=SSL3_ST_SR_KEY_EXCH_A;
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.
618 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
619 DTLS1_SCTP_AUTH_LABEL);
621 SSL_export_keying_material(s, sctpauthkey,
622 sizeof(sctpauthkey), labelbuffer,
623 sizeof(labelbuffer), NULL, 0, 0);
625 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
626 sizeof(sctpauthkey), sctpauthkey);
629 s->state=SSL3_ST_SR_CERT_VRFY_A;
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.
639 s->state=SSL3_ST_SR_FINISHED_A;
644 s->state=SSL3_ST_SR_CERT_VRFY_A;
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,
651 &(s->s3->tmp.cert_verify_md[0]));
652 s->method->ssl3_enc->cert_verify_mac(s,
654 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
658 case SSL3_ST_SR_CERT_VRFY_A:
659 case SSL3_ST_SR_CERT_VRFY_B:
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;
671 s->state=SSL3_ST_SR_FINISHED_A;
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;
684 #ifndef OPENSSL_NO_TLSEXT
685 else if (s->tlsext_ticket_expected)
686 s->state=SSL3_ST_SW_SESSION_TICKET_A;
689 s->state=SSL3_ST_SW_CHANGE_A;
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;
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;
712 case SSL3_ST_SW_CHANGE_A:
713 case SSL3_ST_SW_CHANGE_B:
715 s->session->cipher=s->s3->tmp.new_cipher;
716 if (!s->method->ssl3_enc->setup_key_block(s))
717 { ret= -1; goto end; }
719 ret=dtls1_send_change_cipher_spec(s,
720 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
722 if (ret <= 0) goto end;
724 #ifndef OPENSSL_NO_SCTP
725 /* Change to new shared key of SCTP-Auth,
726 * will be ignored if no SCTP used.
728 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
731 s->state=SSL3_ST_SW_FINISHED_A;
734 if (!s->method->ssl3_enc->change_cipher_state(s,
735 SSL3_CHANGE_CIPHER_SERVER_WRITE))
741 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
744 case SSL3_ST_SW_FINISHED_A:
745 case SSL3_ST_SW_FINISHED_B:
746 ret=dtls1_send_finished(s,
747 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
748 s->method->ssl3_enc->server_finished_label,
749 s->method->ssl3_enc->server_finished_label_len);
750 if (ret <= 0) goto end;
751 s->state=SSL3_ST_SW_FLUSH;
753 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
756 s->s3->tmp.next_state=SSL_ST_OK;
757 #ifndef OPENSSL_NO_SCTP
758 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
760 s->d1->next_state = s->s3->tmp.next_state;
761 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
769 /* clean a few things up */
770 ssl3_cleanup_key_block(s);
773 BUF_MEM_free(s->init_buf);
777 /* remove buffering on output */
778 ssl_free_wbio_buffer(s);
782 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
787 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
789 s->ctx->stats.sess_accept_good++;
791 s->handshake_func=dtls1_accept;
793 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
798 /* done handshaking, next message is client hello */
799 s->d1->handshake_read_seq = 0;
800 /* next message is server hello */
801 s->d1->handshake_write_seq = 0;
802 s->d1->next_handshake_write_seq = 0;
807 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
813 if (!s->s3->tmp.reuse_message && !skip)
817 if ((ret=BIO_flush(s->wbio)) <= 0)
822 if ((cb != NULL) && (s->state != state))
826 cb(s,SSL_CB_ACCEPT_LOOP,1);
833 /* BIO_flush(s->wbio); */
836 #ifndef OPENSSL_NO_SCTP
837 /* Notify SCTP BIO socket to leave handshake
838 * mode and prevent stream identifier other
839 * than 0. Will be ignored if no SCTP is used.
841 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
845 cb(s,SSL_CB_ACCEPT_EXIT,ret);
849 int dtls1_send_hello_request(SSL *s)
853 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
855 p=(unsigned char *)s->init_buf->data;
856 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
858 s->state=SSL3_ST_SW_HELLO_REQ_B;
859 /* number of bytes to write */
860 s->init_num=DTLS1_HM_HEADER_LENGTH;
863 /* no need to buffer this message, since there are no retransmit
867 /* SSL3_ST_SW_HELLO_REQ_B */
868 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
871 int dtls1_send_hello_verify_request(SSL *s)
873 unsigned int msg_len;
874 unsigned char *msg, *buf, *p;
876 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
878 buf = (unsigned char *)s->init_buf->data;
880 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
881 *(p++) = s->version >> 8;
882 *(p++) = s->version & 0xFF;
884 if (s->ctx->app_gen_cookie_cb == NULL ||
885 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
886 &(s->d1->cookie_len)) == 0)
888 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
892 *(p++) = (unsigned char) s->d1->cookie_len;
893 memcpy(p, s->d1->cookie, s->d1->cookie_len);
894 p += s->d1->cookie_len;
897 dtls1_set_message_header(s, buf,
898 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
900 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
901 /* number of bytes to write */
906 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
907 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
910 int dtls1_send_server_hello(SSL *s)
916 unsigned long l,Time;
918 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
920 buf=(unsigned char *)s->init_buf->data;
921 p=s->s3->server_random;
922 Time=(unsigned long)time(NULL); /* Time */
924 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
925 /* Do the message type and length last */
926 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
928 *(p++)=s->version>>8;
929 *(p++)=s->version&0xff;
932 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
935 /* now in theory we have 3 options to sending back the
936 * session id. If it is a re-use, we send back the
937 * old session-id, if it is a new session, we send
938 * back the new session-id or we send back a 0 length
939 * session-id if we want it to be single use.
940 * Currently I will not implement the '0' length session-id
941 * 12-Jan-98 - I'll now support the '0' length stuff.
943 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
944 s->session->session_id_length=0;
946 sl=s->session->session_id_length;
947 if (sl > sizeof s->session->session_id)
949 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
953 memcpy(p,s->session->session_id,sl);
957 if (s->s3->tmp.new_cipher == NULL)
959 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
962 /* put the compression method */
963 #ifdef OPENSSL_NO_COMP
966 if (s->s3->tmp.new_compression == NULL)
969 *(p++)=s->s3->tmp.new_compression->id;
972 #ifndef OPENSSL_NO_TLSEXT
973 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
975 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
984 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
986 s->state=SSL3_ST_SW_SRVR_HELLO_B;
987 /* number of bytes to write */
991 /* buffer the message to handle re-xmits */
992 dtls1_buffer_message(s, 0);
995 /* SSL3_ST_SW_SRVR_HELLO_B */
996 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
999 int dtls1_send_server_done(SSL *s)
1003 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1005 p=(unsigned char *)s->init_buf->data;
1008 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1010 s->state=SSL3_ST_SW_SRVR_DONE_B;
1011 /* number of bytes to write */
1012 s->init_num=DTLS1_HM_HEADER_LENGTH;
1015 /* buffer the message to handle re-xmits */
1016 dtls1_buffer_message(s, 0);
1019 /* SSL3_ST_SW_SRVR_DONE_B */
1020 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1023 int dtls1_send_server_key_exchange(SSL *s)
1025 #ifndef OPENSSL_NO_RSA
1029 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1032 #ifndef OPENSSL_NO_DH
1035 #ifndef OPENSSL_NO_ECDH
1036 EC_KEY *ecdh=NULL, *ecdhp;
1037 unsigned char *encodedPoint = NULL;
1040 BN_CTX *bn_ctx = NULL;
1043 unsigned char *p,*d;
1053 EVP_MD_CTX_init(&md_ctx);
1054 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1056 type=s->s3->tmp.new_cipher->algorithm_mkey;
1061 r[0]=r[1]=r[2]=r[3]=NULL;
1063 #ifndef OPENSSL_NO_RSA
1064 if (type & SSL_kRSA)
1067 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1069 rsa=s->cert->rsa_tmp_cb(s,
1070 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1071 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1074 al=SSL_AD_HANDSHAKE_FAILURE;
1075 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1083 al=SSL_AD_HANDSHAKE_FAILURE;
1084 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1089 s->s3->tmp.use_rsa_tmp=1;
1093 #ifndef OPENSSL_NO_DH
1094 if (type & SSL_kEDH)
1097 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1098 dhp=s->cert->dh_tmp_cb(s,
1099 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1100 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1103 al=SSL_AD_HANDSHAKE_FAILURE;
1104 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1108 if (s->s3->tmp.dh != NULL)
1111 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1115 if ((dh=DHparams_dup(dhp)) == NULL)
1117 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1122 if ((dhp->pub_key == NULL ||
1123 dhp->priv_key == NULL ||
1124 (s->options & SSL_OP_SINGLE_DH_USE)))
1126 if(!DH_generate_key(dh))
1128 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1135 dh->pub_key=BN_dup(dhp->pub_key);
1136 dh->priv_key=BN_dup(dhp->priv_key);
1137 if ((dh->pub_key == NULL) ||
1138 (dh->priv_key == NULL))
1140 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1150 #ifndef OPENSSL_NO_ECDH
1151 if (type & SSL_kEECDH)
1153 const EC_GROUP *group;
1155 ecdhp=cert->ecdh_tmp;
1156 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1158 ecdhp=s->cert->ecdh_tmp_cb(s,
1159 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1160 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1164 al=SSL_AD_HANDSHAKE_FAILURE;
1165 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1169 if (s->s3->tmp.ecdh != NULL)
1171 EC_KEY_free(s->s3->tmp.ecdh);
1172 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1176 /* Duplicate the ECDH structure. */
1179 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1182 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1184 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1188 s->s3->tmp.ecdh=ecdh;
1189 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1190 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1191 (s->options & SSL_OP_SINGLE_ECDH_USE))
1193 if(!EC_KEY_generate_key(ecdh))
1195 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1200 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1201 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1202 (EC_KEY_get0_private_key(ecdh) == NULL))
1204 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1208 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1209 (EC_GROUP_get_degree(group) > 163))
1211 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1215 /* XXX: For now, we only support ephemeral ECDH
1216 * keys over named (not generic) curves. For
1217 * supported named curves, curve_id is non-zero.
1220 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1223 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1227 /* Encode the public key.
1228 * First check the size of encoding and
1229 * allocate memory accordingly.
1231 encodedlen = EC_POINT_point2oct(group,
1232 EC_KEY_get0_public_key(ecdh),
1233 POINT_CONVERSION_UNCOMPRESSED,
1236 encodedPoint = (unsigned char *)
1237 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1238 bn_ctx = BN_CTX_new();
1239 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1241 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1246 encodedlen = EC_POINT_point2oct(group,
1247 EC_KEY_get0_public_key(ecdh),
1248 POINT_CONVERSION_UNCOMPRESSED,
1249 encodedPoint, encodedlen, bn_ctx);
1251 if (encodedlen == 0)
1253 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1257 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1259 /* XXX: For now, we only support named (not
1260 * generic) curves in ECDH ephemeral key exchanges.
1261 * In this situation, we need four additional bytes
1262 * to encode the entire ServerECDHParams
1267 /* We'll generate the serverKeyExchange message
1268 * explicitly so we can set these to NULLs
1276 #endif /* !OPENSSL_NO_ECDH */
1277 #ifndef OPENSSL_NO_PSK
1278 if (type & SSL_kPSK)
1280 /* reserve size for record length and PSK identity hint*/
1281 n+=2+strlen(s->ctx->psk_identity_hint);
1284 #endif /* !OPENSSL_NO_PSK */
1286 al=SSL_AD_HANDSHAKE_FAILURE;
1287 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1290 for (i=0; r[i] != NULL; i++)
1292 nr[i]=BN_num_bytes(r[i]);
1296 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1297 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1299 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1302 al=SSL_AD_DECODE_ERROR;
1305 kn=EVP_PKEY_size(pkey);
1313 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1315 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1318 d=(unsigned char *)s->init_buf->data;
1319 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1321 for (i=0; r[i] != NULL; i++)
1328 #ifndef OPENSSL_NO_ECDH
1329 if (type & SSL_kEECDH)
1331 /* XXX: For now, we only support named (not generic) curves.
1332 * In this situation, the serverKeyExchange message has:
1333 * [1 byte CurveType], [2 byte CurveName]
1334 * [1 byte length of encoded point], followed by
1335 * the actual encoded point itself
1337 *p = NAMED_CURVE_TYPE;
1345 memcpy((unsigned char*)p,
1346 (unsigned char *)encodedPoint,
1348 OPENSSL_free(encodedPoint);
1353 #ifndef OPENSSL_NO_PSK
1354 if (type & SSL_kPSK)
1356 /* copy PSK identity hint */
1357 s2n(strlen(s->ctx->psk_identity_hint), p);
1358 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1359 p+=strlen(s->ctx->psk_identity_hint);
1366 /* n is the length of the params, they start at
1367 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1369 #ifndef OPENSSL_NO_RSA
1370 if (pkey->type == EVP_PKEY_RSA)
1374 for (num=2; num > 0; num--)
1376 EVP_DigestInit_ex(&md_ctx,(num == 2)
1377 ?s->ctx->md5:s->ctx->sha1, NULL);
1378 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1379 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1380 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1381 EVP_DigestFinal_ex(&md_ctx,q,
1382 (unsigned int *)&i);
1386 if (RSA_sign(NID_md5_sha1, md_buf, j,
1387 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1389 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1397 #if !defined(OPENSSL_NO_DSA)
1398 if (pkey->type == EVP_PKEY_DSA)
1401 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1402 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1403 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1404 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1405 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1406 (unsigned int *)&i,pkey))
1408 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1416 #if !defined(OPENSSL_NO_ECDSA)
1417 if (pkey->type == EVP_PKEY_EC)
1419 /* let's do ECDSA */
1420 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1421 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1422 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1423 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1424 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1425 (unsigned int *)&i,pkey))
1427 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1436 /* Is this error check actually needed? */
1437 al=SSL_AD_HANDSHAKE_FAILURE;
1438 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1443 d = dtls1_set_message_header(s, d,
1444 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1446 /* we should now have things packed up, so lets send
1448 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1451 /* buffer the message to handle re-xmits */
1452 dtls1_buffer_message(s, 0);
1455 s->state = SSL3_ST_SW_KEY_EXCH_B;
1456 EVP_MD_CTX_cleanup(&md_ctx);
1457 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1459 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1461 #ifndef OPENSSL_NO_ECDH
1462 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1463 BN_CTX_free(bn_ctx);
1465 EVP_MD_CTX_cleanup(&md_ctx);
1469 int dtls1_send_certificate_request(SSL *s)
1471 unsigned char *p,*d;
1473 STACK_OF(X509_NAME) *sk=NULL;
1476 unsigned int msg_len;
1478 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1482 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1484 /* get the list of acceptable cert types */
1486 n=ssl3_get_req_cert_type(s,p);
1495 sk=SSL_get_client_CA_list(s);
1499 for (i=0; i<sk_X509_NAME_num(sk); i++)
1501 name=sk_X509_NAME_value(sk,i);
1502 j=i2d_X509_NAME(name,NULL);
1503 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1505 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1508 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1509 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1512 i2d_X509_NAME(name,&p);
1519 i2d_X509_NAME(name,&p);
1520 j-=2; s2n(j,d); j+=2;
1526 /* else no CA names */
1527 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1530 d=(unsigned char *)buf->data;
1531 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1533 s2n(s->d1->handshake_write_seq,d);
1534 s->d1->handshake_write_seq++;
1536 /* we should now have things packed up, so lets send
1539 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1541 #ifdef NETSCAPE_HANG_BUG
1542 /* XXX: what to do about this? */
1543 p=(unsigned char *)s->init_buf->data + s->init_num;
1546 *(p++)=SSL3_MT_SERVER_DONE;
1553 /* XDTLS: set message header ? */
1554 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1555 dtls1_set_message_header(s, (void *)s->init_buf->data,
1556 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1558 /* buffer the message to handle re-xmits */
1559 dtls1_buffer_message(s, 0);
1561 s->state = SSL3_ST_SW_CERT_REQ_B;
1564 /* SSL3_ST_SW_CERT_REQ_B */
1565 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1570 int dtls1_send_server_certificate(SSL *s)
1575 if (s->state == SSL3_ST_SW_CERT_A)
1577 x=ssl_get_server_send_cert(s);
1580 /* VRS: allow null cert if auth == KRB5 */
1581 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1582 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1584 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1589 l=dtls1_output_cert_chain(s,x);
1590 s->state=SSL3_ST_SW_CERT_B;
1594 /* buffer the message to handle re-xmits */
1595 dtls1_buffer_message(s, 0);
1598 /* SSL3_ST_SW_CERT_B */
1599 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1602 #ifndef OPENSSL_NO_TLSEXT
1603 int dtls1_send_newsession_ticket(SSL *s)
1605 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1607 unsigned char *p, *senc, *macstart;
1609 unsigned int hlen, msg_len;
1612 SSL_CTX *tctx = s->initial_ctx;
1613 unsigned char iv[EVP_MAX_IV_LENGTH];
1614 unsigned char key_name[16];
1616 /* get session encoding length */
1617 slen = i2d_SSL_SESSION(s->session, NULL);
1618 /* Some length values are 16 bits, so forget it if session is
1623 /* Grow buffer if need be: the length calculation is as
1624 * follows 12 (DTLS handshake message header) +
1625 * 4 (ticket lifetime hint) + 2 (ticket length) +
1626 * 16 (key name) + max_iv_len (iv length) +
1627 * session_length + max_enc_block_size (max encrypted session
1628 * length) + max_md_size (HMAC).
1630 if (!BUF_MEM_grow(s->init_buf,
1631 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1632 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1634 senc = OPENSSL_malloc(slen);
1638 i2d_SSL_SESSION(s->session, &p);
1640 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1641 EVP_CIPHER_CTX_init(&ctx);
1642 HMAC_CTX_init(&hctx);
1643 /* Initialize HMAC and cipher contexts. If callback present
1644 * it does all the work otherwise use generated values
1647 if (tctx->tlsext_ticket_key_cb)
1649 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1658 RAND_pseudo_bytes(iv, 16);
1659 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1660 tctx->tlsext_tick_aes_key, iv);
1661 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1662 tlsext_tick_md(), NULL);
1663 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1665 l2n(s->session->tlsext_tick_lifetime_hint, p);
1666 /* Skip ticket length for now */
1668 /* Output key name */
1670 memcpy(p, key_name, 16);
1673 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1674 p += EVP_CIPHER_CTX_iv_length(&ctx);
1675 /* Encrypt session data */
1676 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1678 EVP_EncryptFinal(&ctx, p, &len);
1680 EVP_CIPHER_CTX_cleanup(&ctx);
1682 HMAC_Update(&hctx, macstart, p - macstart);
1683 HMAC_Final(&hctx, p, &hlen);
1684 HMAC_CTX_cleanup(&hctx);
1687 /* Now write out lengths: p points to end of data written */
1689 len = p - (unsigned char *)(s->init_buf->data);
1691 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1692 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1694 /* number of bytes to write */
1696 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1700 /* XDTLS: set message header ? */
1701 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1702 dtls1_set_message_header(s, (void *)s->init_buf->data,
1703 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1705 /* buffer the message to handle re-xmits */
1706 dtls1_buffer_message(s, 0);
1709 /* SSL3_ST_SW_SESSION_TICKET_B */
1710 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));