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))
243 if (!ssl3_setup_buffers(s))
250 s->d1->change_cipher_spec_ok = 0;
251 /* Should have been reset by ssl3_get_finished, too. */
252 s->s3->change_cipher_spec = 0;
254 if (s->state != SSL_ST_RENEGOTIATE)
256 /* Ok, we now need to push on a buffering BIO so that
257 * the output is sent in a way that TCP likes :-)
258 * ...but not with SCTP :-)
260 #ifndef OPENSSL_NO_SCTP
261 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
263 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
265 ssl3_init_finished_mac(s);
266 s->state=SSL3_ST_SR_CLNT_HELLO_A;
267 s->ctx->stats.sess_accept++;
271 /* s->state == SSL_ST_RENEGOTIATE,
272 * we will just send a HelloRequest */
273 s->ctx->stats.sess_accept_renegotiate++;
274 s->state=SSL3_ST_SW_HELLO_REQ_A;
279 case SSL3_ST_SW_HELLO_REQ_A:
280 case SSL3_ST_SW_HELLO_REQ_B:
283 dtls1_clear_record_buffer(s);
284 dtls1_start_timer(s);
285 ret=dtls1_send_hello_request(s);
286 if (ret <= 0) goto end;
287 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
288 s->state=SSL3_ST_SW_FLUSH;
291 ssl3_init_finished_mac(s);
294 case SSL3_ST_SW_HELLO_REQ_C:
298 case SSL3_ST_SR_CLNT_HELLO_A:
299 case SSL3_ST_SR_CLNT_HELLO_B:
300 case SSL3_ST_SR_CLNT_HELLO_C:
303 ret=ssl3_get_client_hello(s);
304 if (ret <= 0) goto end;
307 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
308 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
310 s->state = SSL3_ST_SW_SRVR_HELLO_A;
314 /* Reflect ClientHello sequence to remain stateless while listening */
317 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
320 /* If we're just listening, stop here */
321 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
325 /* Set expected sequence numbers
326 * to continue the handshake.
328 s->d1->handshake_read_seq = 2;
329 s->d1->handshake_write_seq = 1;
330 s->d1->next_handshake_write_seq = 1;
336 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
337 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
339 ret = dtls1_send_hello_verify_request(s);
340 if ( ret <= 0) goto end;
341 s->state=SSL3_ST_SW_FLUSH;
342 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
344 /* HelloVerifyRequest resets Finished MAC */
345 if (s->version != DTLS1_BAD_VER)
346 ssl3_init_finished_mac(s);
349 #ifndef OPENSSL_NO_SCTP
350 case DTLS1_SCTP_ST_SR_READ_SOCK:
352 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
354 s->s3->in_read_app_data=2;
355 s->rwstate=SSL_READING;
356 BIO_clear_retry_flags(SSL_get_rbio(s));
357 BIO_set_retry_read(SSL_get_rbio(s));
362 s->state=SSL3_ST_SR_FINISHED_A;
365 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
366 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
367 if (ret < 0) goto end;
371 if (s->d1->next_state != SSL_ST_OK)
373 s->s3->in_read_app_data=2;
374 s->rwstate=SSL_READING;
375 BIO_clear_retry_flags(SSL_get_rbio(s));
376 BIO_set_retry_read(SSL_get_rbio(s));
382 s->state=s->d1->next_state;
386 case SSL3_ST_SW_SRVR_HELLO_A:
387 case SSL3_ST_SW_SRVR_HELLO_B:
389 dtls1_start_timer(s);
390 ret=dtls1_send_server_hello(s);
391 if (ret <= 0) goto end;
395 #ifndef OPENSSL_NO_SCTP
396 /* Add new shared key for SCTP-Auth,
397 * will be ignored if no SCTP used.
399 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
400 DTLS1_SCTP_AUTH_LABEL);
402 SSL_export_keying_material(s, sctpauthkey,
403 sizeof(sctpauthkey), labelbuffer,
404 sizeof(labelbuffer), NULL, 0, 0);
406 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
407 sizeof(sctpauthkey), sctpauthkey);
409 #ifndef OPENSSL_NO_TLSEXT
410 if (s->tlsext_ticket_expected)
411 s->state=SSL3_ST_SW_SESSION_TICKET_A;
413 s->state=SSL3_ST_SW_CHANGE_A;
415 s->state=SSL3_ST_SW_CHANGE_A;
419 s->state=SSL3_ST_SW_CERT_A;
423 case SSL3_ST_SW_CERT_A:
424 case SSL3_ST_SW_CERT_B:
425 /* Check if it is anon DH or normal PSK */
426 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
427 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
429 dtls1_start_timer(s);
430 ret=dtls1_send_server_certificate(s);
431 if (ret <= 0) goto end;
432 #ifndef OPENSSL_NO_TLSEXT
433 if (s->tlsext_status_expected)
434 s->state=SSL3_ST_SW_CERT_STATUS_A;
436 s->state=SSL3_ST_SW_KEY_EXCH_A;
441 s->state=SSL3_ST_SW_KEY_EXCH_A;
448 s->state=SSL3_ST_SW_KEY_EXCH_A;
453 case SSL3_ST_SW_KEY_EXCH_A:
454 case SSL3_ST_SW_KEY_EXCH_B:
455 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
458 * clear this, it may get reset by
459 * send_server_key_exchange
461 s->s3->tmp.use_rsa_tmp=0;
463 /* only send if a DH key exchange or
464 * RSA but we have a sign only certificate */
466 /* PSK: send ServerKeyExchange if PSK identity
467 * hint if provided */
468 #ifndef OPENSSL_NO_PSK
469 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
471 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
472 || (alg_k & SSL_kEECDH)
473 || ((alg_k & SSL_kRSA)
474 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
475 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
476 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
482 dtls1_start_timer(s);
483 ret=dtls1_send_server_key_exchange(s);
484 if (ret <= 0) goto end;
489 s->state=SSL3_ST_SW_CERT_REQ_A;
493 case SSL3_ST_SW_CERT_REQ_A:
494 case SSL3_ST_SW_CERT_REQ_B:
495 if (/* don't request cert unless asked for it: */
496 !(s->verify_mode & SSL_VERIFY_PEER) ||
497 /* if SSL_VERIFY_CLIENT_ONCE is set,
498 * don't request cert during re-negotiation: */
499 ((s->session->peer != NULL) &&
500 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
501 /* never request cert in anonymous ciphersuites
502 * (see section "Certificate request" in SSL 3 drafts
503 * and in RFC 2246): */
504 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
505 /* ... except when the application insists on verification
506 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
507 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
508 /* never request cert in Kerberos ciphersuites */
509 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
510 /* With normal PSK Certificates and
511 * Certificate Requests are omitted */
512 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
514 /* no cert request */
516 s->s3->tmp.cert_request=0;
517 s->state=SSL3_ST_SW_SRVR_DONE_A;
518 #ifndef OPENSSL_NO_SCTP
519 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
521 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
522 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
528 s->s3->tmp.cert_request=1;
529 dtls1_start_timer(s);
530 ret=dtls1_send_certificate_request(s);
531 if (ret <= 0) goto end;
532 #ifndef NETSCAPE_HANG_BUG
533 s->state=SSL3_ST_SW_SRVR_DONE_A;
534 #ifndef OPENSSL_NO_SCTP
535 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
537 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
538 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
542 s->state=SSL3_ST_SW_FLUSH;
543 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
544 #ifndef OPENSSL_NO_SCTP
545 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
547 s->d1->next_state = s->s3->tmp.next_state;
548 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
556 case SSL3_ST_SW_SRVR_DONE_A:
557 case SSL3_ST_SW_SRVR_DONE_B:
558 dtls1_start_timer(s);
559 ret=dtls1_send_server_done(s);
560 if (ret <= 0) goto end;
561 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
562 s->state=SSL3_ST_SW_FLUSH;
566 case SSL3_ST_SW_FLUSH:
567 s->rwstate=SSL_WRITING;
568 if (BIO_flush(s->wbio) <= 0)
570 /* If the write error was fatal, stop trying */
571 if (!BIO_should_retry(s->wbio))
573 s->rwstate=SSL_NOTHING;
574 s->state=s->s3->tmp.next_state;
580 s->rwstate=SSL_NOTHING;
581 s->state=s->s3->tmp.next_state;
584 case SSL3_ST_SR_CERT_A:
585 case SSL3_ST_SR_CERT_B:
586 /* Check for second client hello (MS SGC) */
587 ret = ssl3_check_client_hello(s);
593 s->state = SSL3_ST_SR_CLNT_HELLO_C;
596 if (s->s3->tmp.cert_request)
598 ret=ssl3_get_client_certificate(s);
599 if (ret <= 0) goto end;
602 s->state=SSL3_ST_SR_KEY_EXCH_A;
606 case SSL3_ST_SR_KEY_EXCH_A:
607 case SSL3_ST_SR_KEY_EXCH_B:
608 ret=ssl3_get_client_key_exchange(s);
609 if (ret <= 0) goto end;
610 #ifndef OPENSSL_NO_SCTP
611 /* Add new shared key for SCTP-Auth,
612 * will be ignored if no SCTP used.
614 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
615 DTLS1_SCTP_AUTH_LABEL);
617 SSL_export_keying_material(s, sctpauthkey,
618 sizeof(sctpauthkey), labelbuffer,
619 sizeof(labelbuffer), NULL, 0, 0);
621 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
622 sizeof(sctpauthkey), sctpauthkey);
625 s->state=SSL3_ST_SR_CERT_VRFY_A;
630 /* For the ECDH ciphersuites when
631 * the client sends its ECDH pub key in
632 * a certificate, the CertificateVerify
633 * message is not sent.
635 s->state=SSL3_ST_SR_FINISHED_A;
640 s->state=SSL3_ST_SR_CERT_VRFY_A;
643 /* We need to get hashes here so if there is
644 * a client cert, it can be verified */
645 s->method->ssl3_enc->cert_verify_mac(s,
647 &(s->s3->tmp.cert_verify_md[0]));
648 s->method->ssl3_enc->cert_verify_mac(s,
650 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
654 case SSL3_ST_SR_CERT_VRFY_A:
655 case SSL3_ST_SR_CERT_VRFY_B:
657 * This *should* be the first time we enable CCS, but be
658 * extra careful about surrounding code changes. We need
659 * to set this here because we don't know if we're
660 * expecting a CertificateVerify or not.
662 if (!s->s3->change_cipher_spec)
663 s->d1->change_cipher_spec_ok = 1;
664 /* we should decide if we expected this one */
665 ret=ssl3_get_cert_verify(s);
666 if (ret <= 0) goto end;
667 #ifndef OPENSSL_NO_SCTP
668 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
669 state == SSL_ST_RENEGOTIATE)
670 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
673 s->state=SSL3_ST_SR_FINISHED_A;
677 case SSL3_ST_SR_FINISHED_A:
678 case SSL3_ST_SR_FINISHED_B:
680 * Enable CCS for resumed handshakes.
681 * In a full handshake, we end up here through
682 * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was
683 * already set. Receiving a CCS clears the flag, so make
684 * sure not to re-enable it to ban duplicates.
685 * s->s3->change_cipher_spec is set when a CCS is
686 * processed in d1_pkt.c, and remains set until
687 * the client's Finished message is read.
689 if (!s->s3->change_cipher_spec)
690 s->d1->change_cipher_spec_ok = 1;
691 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
692 SSL3_ST_SR_FINISHED_B);
693 if (ret <= 0) goto end;
697 #ifndef OPENSSL_NO_TLSEXT
698 else if (s->tlsext_ticket_expected)
699 s->state=SSL3_ST_SW_SESSION_TICKET_A;
702 s->state=SSL3_ST_SW_CHANGE_A;
706 #ifndef OPENSSL_NO_TLSEXT
707 case SSL3_ST_SW_SESSION_TICKET_A:
708 case SSL3_ST_SW_SESSION_TICKET_B:
709 ret=dtls1_send_newsession_ticket(s);
710 if (ret <= 0) goto end;
711 s->state=SSL3_ST_SW_CHANGE_A;
715 case SSL3_ST_SW_CERT_STATUS_A:
716 case SSL3_ST_SW_CERT_STATUS_B:
717 ret=ssl3_send_cert_status(s);
718 if (ret <= 0) goto end;
719 s->state=SSL3_ST_SW_KEY_EXCH_A;
725 case SSL3_ST_SW_CHANGE_A:
726 case SSL3_ST_SW_CHANGE_B:
728 s->session->cipher=s->s3->tmp.new_cipher;
729 if (!s->method->ssl3_enc->setup_key_block(s))
730 { ret= -1; goto end; }
732 ret=dtls1_send_change_cipher_spec(s,
733 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
735 if (ret <= 0) goto end;
737 #ifndef OPENSSL_NO_SCTP
740 /* Change to new shared key of SCTP-Auth,
741 * will be ignored if no SCTP used.
743 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
747 s->state=SSL3_ST_SW_FINISHED_A;
750 if (!s->method->ssl3_enc->change_cipher_state(s,
751 SSL3_CHANGE_CIPHER_SERVER_WRITE))
757 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
760 case SSL3_ST_SW_FINISHED_A:
761 case SSL3_ST_SW_FINISHED_B:
762 ret=dtls1_send_finished(s,
763 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
764 s->method->ssl3_enc->server_finished_label,
765 s->method->ssl3_enc->server_finished_label_len);
766 if (ret <= 0) goto end;
767 s->state=SSL3_ST_SW_FLUSH;
770 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
772 #ifndef OPENSSL_NO_SCTP
773 /* Change to new shared key of SCTP-Auth,
774 * will be ignored if no SCTP used.
776 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
781 s->s3->tmp.next_state=SSL_ST_OK;
782 #ifndef OPENSSL_NO_SCTP
783 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
785 s->d1->next_state = s->s3->tmp.next_state;
786 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
794 /* clean a few things up */
795 ssl3_cleanup_key_block(s);
798 BUF_MEM_free(s->init_buf);
802 /* remove buffering on output */
803 ssl_free_wbio_buffer(s);
807 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
812 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
814 s->ctx->stats.sess_accept_good++;
816 s->handshake_func=dtls1_accept;
818 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
823 /* done handshaking, next message is client hello */
824 s->d1->handshake_read_seq = 0;
825 /* next message is server hello */
826 s->d1->handshake_write_seq = 0;
827 s->d1->next_handshake_write_seq = 0;
832 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
838 if (!s->s3->tmp.reuse_message && !skip)
842 if ((ret=BIO_flush(s->wbio)) <= 0)
847 if ((cb != NULL) && (s->state != state))
851 cb(s,SSL_CB_ACCEPT_LOOP,1);
858 /* BIO_flush(s->wbio); */
861 #ifndef OPENSSL_NO_SCTP
862 /* Notify SCTP BIO socket to leave handshake
863 * mode and prevent stream identifier other
864 * than 0. Will be ignored if no SCTP is used.
866 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
870 cb(s,SSL_CB_ACCEPT_EXIT,ret);
874 int dtls1_send_hello_request(SSL *s)
878 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
880 p=(unsigned char *)s->init_buf->data;
881 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
883 s->state=SSL3_ST_SW_HELLO_REQ_B;
884 /* number of bytes to write */
885 s->init_num=DTLS1_HM_HEADER_LENGTH;
888 /* no need to buffer this message, since there are no retransmit
892 /* SSL3_ST_SW_HELLO_REQ_B */
893 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
896 int dtls1_send_hello_verify_request(SSL *s)
898 unsigned int msg_len;
899 unsigned char *msg, *buf, *p;
901 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
903 buf = (unsigned char *)s->init_buf->data;
905 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
906 *(p++) = s->version >> 8;
907 *(p++) = s->version & 0xFF;
909 if (s->ctx->app_gen_cookie_cb == NULL ||
910 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
911 &(s->d1->cookie_len)) == 0)
913 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
917 *(p++) = (unsigned char) s->d1->cookie_len;
918 memcpy(p, s->d1->cookie, s->d1->cookie_len);
919 p += s->d1->cookie_len;
922 dtls1_set_message_header(s, buf,
923 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
925 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
926 /* number of bytes to write */
931 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
932 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
935 int dtls1_send_server_hello(SSL *s)
943 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
945 buf=(unsigned char *)s->init_buf->data;
946 p=s->s3->server_random;
947 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
948 /* Do the message type and length last */
949 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
951 *(p++)=s->version>>8;
952 *(p++)=s->version&0xff;
955 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
958 /* now in theory we have 3 options to sending back the
959 * session id. If it is a re-use, we send back the
960 * old session-id, if it is a new session, we send
961 * back the new session-id or we send back a 0 length
962 * session-id if we want it to be single use.
963 * Currently I will not implement the '0' length session-id
964 * 12-Jan-98 - I'll now support the '0' length stuff.
966 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
967 s->session->session_id_length=0;
969 sl=s->session->session_id_length;
970 if (sl > sizeof s->session->session_id)
972 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
976 memcpy(p,s->session->session_id,sl);
980 if (s->s3->tmp.new_cipher == NULL)
982 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
985 /* put the compression method */
986 #ifdef OPENSSL_NO_COMP
989 if (s->s3->tmp.new_compression == NULL)
992 *(p++)=s->s3->tmp.new_compression->id;
995 #ifndef OPENSSL_NO_TLSEXT
996 if (ssl_prepare_serverhello_tlsext(s) <= 0)
998 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1001 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1003 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1012 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1014 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1015 /* number of bytes to write */
1019 /* buffer the message to handle re-xmits */
1020 dtls1_buffer_message(s, 0);
1023 /* SSL3_ST_SW_SRVR_HELLO_B */
1024 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1027 int dtls1_send_server_done(SSL *s)
1031 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1033 p=(unsigned char *)s->init_buf->data;
1036 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1038 s->state=SSL3_ST_SW_SRVR_DONE_B;
1039 /* number of bytes to write */
1040 s->init_num=DTLS1_HM_HEADER_LENGTH;
1043 /* buffer the message to handle re-xmits */
1044 dtls1_buffer_message(s, 0);
1047 /* SSL3_ST_SW_SRVR_DONE_B */
1048 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1051 int dtls1_send_server_key_exchange(SSL *s)
1053 #ifndef OPENSSL_NO_RSA
1057 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1060 #ifndef OPENSSL_NO_DH
1063 #ifndef OPENSSL_NO_ECDH
1064 EC_KEY *ecdh=NULL, *ecdhp;
1065 unsigned char *encodedPoint = NULL;
1068 BN_CTX *bn_ctx = NULL;
1071 unsigned char *p,*d;
1081 EVP_MD_CTX_init(&md_ctx);
1082 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1084 type=s->s3->tmp.new_cipher->algorithm_mkey;
1089 r[0]=r[1]=r[2]=r[3]=NULL;
1091 #ifndef OPENSSL_NO_RSA
1092 if (type & SSL_kRSA)
1095 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1097 rsa=s->cert->rsa_tmp_cb(s,
1098 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1099 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1102 al=SSL_AD_HANDSHAKE_FAILURE;
1103 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1111 al=SSL_AD_HANDSHAKE_FAILURE;
1112 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1117 s->s3->tmp.use_rsa_tmp=1;
1121 #ifndef OPENSSL_NO_DH
1122 if (type & SSL_kEDH)
1125 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1126 dhp=s->cert->dh_tmp_cb(s,
1127 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1128 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1131 al=SSL_AD_HANDSHAKE_FAILURE;
1132 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1136 if (s->s3->tmp.dh != NULL)
1139 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1143 if ((dh=DHparams_dup(dhp)) == NULL)
1145 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1150 if ((dhp->pub_key == NULL ||
1151 dhp->priv_key == NULL ||
1152 (s->options & SSL_OP_SINGLE_DH_USE)))
1154 if(!DH_generate_key(dh))
1156 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1163 dh->pub_key=BN_dup(dhp->pub_key);
1164 dh->priv_key=BN_dup(dhp->priv_key);
1165 if ((dh->pub_key == NULL) ||
1166 (dh->priv_key == NULL))
1168 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1178 #ifndef OPENSSL_NO_ECDH
1179 if (type & SSL_kEECDH)
1181 const EC_GROUP *group;
1183 ecdhp=cert->ecdh_tmp;
1184 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1186 ecdhp=s->cert->ecdh_tmp_cb(s,
1187 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1188 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1192 al=SSL_AD_HANDSHAKE_FAILURE;
1193 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1197 if (s->s3->tmp.ecdh != NULL)
1199 EC_KEY_free(s->s3->tmp.ecdh);
1200 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1204 /* Duplicate the ECDH structure. */
1207 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1210 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1212 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1216 s->s3->tmp.ecdh=ecdh;
1217 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1218 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1219 (s->options & SSL_OP_SINGLE_ECDH_USE))
1221 if(!EC_KEY_generate_key(ecdh))
1223 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1228 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1229 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1230 (EC_KEY_get0_private_key(ecdh) == NULL))
1232 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1236 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1237 (EC_GROUP_get_degree(group) > 163))
1239 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1243 /* XXX: For now, we only support ephemeral ECDH
1244 * keys over named (not generic) curves. For
1245 * supported named curves, curve_id is non-zero.
1248 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1251 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1255 /* Encode the public key.
1256 * First check the size of encoding and
1257 * allocate memory accordingly.
1259 encodedlen = EC_POINT_point2oct(group,
1260 EC_KEY_get0_public_key(ecdh),
1261 POINT_CONVERSION_UNCOMPRESSED,
1264 encodedPoint = (unsigned char *)
1265 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1266 bn_ctx = BN_CTX_new();
1267 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1269 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1274 encodedlen = EC_POINT_point2oct(group,
1275 EC_KEY_get0_public_key(ecdh),
1276 POINT_CONVERSION_UNCOMPRESSED,
1277 encodedPoint, encodedlen, bn_ctx);
1279 if (encodedlen == 0)
1281 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1285 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1287 /* XXX: For now, we only support named (not
1288 * generic) curves in ECDH ephemeral key exchanges.
1289 * In this situation, we need four additional bytes
1290 * to encode the entire ServerECDHParams
1295 /* We'll generate the serverKeyExchange message
1296 * explicitly so we can set these to NULLs
1304 #endif /* !OPENSSL_NO_ECDH */
1305 #ifndef OPENSSL_NO_PSK
1306 if (type & SSL_kPSK)
1308 /* reserve size for record length and PSK identity hint*/
1309 n+=2+strlen(s->ctx->psk_identity_hint);
1312 #endif /* !OPENSSL_NO_PSK */
1314 al=SSL_AD_HANDSHAKE_FAILURE;
1315 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1318 for (i=0; r[i] != NULL; i++)
1320 nr[i]=BN_num_bytes(r[i]);
1324 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1325 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1327 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1330 al=SSL_AD_DECODE_ERROR;
1333 kn=EVP_PKEY_size(pkey);
1341 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1343 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1346 d=(unsigned char *)s->init_buf->data;
1347 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1349 for (i=0; r[i] != NULL; i++)
1356 #ifndef OPENSSL_NO_ECDH
1357 if (type & SSL_kEECDH)
1359 /* XXX: For now, we only support named (not generic) curves.
1360 * In this situation, the serverKeyExchange message has:
1361 * [1 byte CurveType], [2 byte CurveName]
1362 * [1 byte length of encoded point], followed by
1363 * the actual encoded point itself
1365 *p = NAMED_CURVE_TYPE;
1373 memcpy((unsigned char*)p,
1374 (unsigned char *)encodedPoint,
1376 OPENSSL_free(encodedPoint);
1377 encodedPoint = NULL;
1382 #ifndef OPENSSL_NO_PSK
1383 if (type & SSL_kPSK)
1385 /* copy PSK identity hint */
1386 s2n(strlen(s->ctx->psk_identity_hint), p);
1387 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1388 p+=strlen(s->ctx->psk_identity_hint);
1395 /* n is the length of the params, they start at
1396 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1398 #ifndef OPENSSL_NO_RSA
1399 if (pkey->type == EVP_PKEY_RSA)
1403 for (num=2; num > 0; num--)
1405 EVP_DigestInit_ex(&md_ctx,(num == 2)
1406 ?s->ctx->md5:s->ctx->sha1, NULL);
1407 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1408 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1409 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1410 EVP_DigestFinal_ex(&md_ctx,q,
1411 (unsigned int *)&i);
1415 if (RSA_sign(NID_md5_sha1, md_buf, j,
1416 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1418 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1426 #if !defined(OPENSSL_NO_DSA)
1427 if (pkey->type == EVP_PKEY_DSA)
1430 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1431 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1432 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1433 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1434 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1435 (unsigned int *)&i,pkey))
1437 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1445 #if !defined(OPENSSL_NO_ECDSA)
1446 if (pkey->type == EVP_PKEY_EC)
1448 /* let's do ECDSA */
1449 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1450 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1451 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1452 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1453 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1454 (unsigned int *)&i,pkey))
1456 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1465 /* Is this error check actually needed? */
1466 al=SSL_AD_HANDSHAKE_FAILURE;
1467 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1472 d = dtls1_set_message_header(s, d,
1473 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1475 /* we should now have things packed up, so lets send
1477 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1480 /* buffer the message to handle re-xmits */
1481 dtls1_buffer_message(s, 0);
1484 s->state = SSL3_ST_SW_KEY_EXCH_B;
1485 EVP_MD_CTX_cleanup(&md_ctx);
1486 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1488 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1490 #ifndef OPENSSL_NO_ECDH
1491 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1492 BN_CTX_free(bn_ctx);
1494 EVP_MD_CTX_cleanup(&md_ctx);
1498 int dtls1_send_certificate_request(SSL *s)
1500 unsigned char *p,*d;
1502 STACK_OF(X509_NAME) *sk=NULL;
1505 unsigned int msg_len;
1507 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1511 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1513 /* get the list of acceptable cert types */
1515 n=ssl3_get_req_cert_type(s,p);
1524 sk=SSL_get_client_CA_list(s);
1528 for (i=0; i<sk_X509_NAME_num(sk); i++)
1530 name=sk_X509_NAME_value(sk,i);
1531 j=i2d_X509_NAME(name,NULL);
1532 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1534 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1537 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1538 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1541 i2d_X509_NAME(name,&p);
1548 i2d_X509_NAME(name,&p);
1549 j-=2; s2n(j,d); j+=2;
1555 /* else no CA names */
1556 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1559 d=(unsigned char *)buf->data;
1560 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1562 s2n(s->d1->handshake_write_seq,d);
1563 s->d1->handshake_write_seq++;
1565 /* we should now have things packed up, so lets send
1568 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1570 #ifdef NETSCAPE_HANG_BUG
1571 /* XXX: what to do about this? */
1572 p=(unsigned char *)s->init_buf->data + s->init_num;
1575 *(p++)=SSL3_MT_SERVER_DONE;
1582 /* XDTLS: set message header ? */
1583 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1584 dtls1_set_message_header(s, (void *)s->init_buf->data,
1585 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1587 /* buffer the message to handle re-xmits */
1588 dtls1_buffer_message(s, 0);
1590 s->state = SSL3_ST_SW_CERT_REQ_B;
1593 /* SSL3_ST_SW_CERT_REQ_B */
1594 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1599 int dtls1_send_server_certificate(SSL *s)
1604 if (s->state == SSL3_ST_SW_CERT_A)
1606 x=ssl_get_server_send_cert(s);
1609 /* VRS: allow null cert if auth == KRB5 */
1610 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1611 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1613 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1618 l=dtls1_output_cert_chain(s,x);
1621 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1624 s->state=SSL3_ST_SW_CERT_B;
1628 /* buffer the message to handle re-xmits */
1629 dtls1_buffer_message(s, 0);
1632 /* SSL3_ST_SW_CERT_B */
1633 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1636 #ifndef OPENSSL_NO_TLSEXT
1637 int dtls1_send_newsession_ticket(SSL *s)
1639 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1641 unsigned char *p, *senc, *macstart;
1643 unsigned int hlen, msg_len;
1646 SSL_CTX *tctx = s->initial_ctx;
1647 unsigned char iv[EVP_MAX_IV_LENGTH];
1648 unsigned char key_name[16];
1650 /* get session encoding length */
1651 slen = i2d_SSL_SESSION(s->session, NULL);
1652 /* Some length values are 16 bits, so forget it if session is
1657 /* Grow buffer if need be: the length calculation is as
1658 * follows 12 (DTLS handshake message header) +
1659 * 4 (ticket lifetime hint) + 2 (ticket length) +
1660 * 16 (key name) + max_iv_len (iv length) +
1661 * session_length + max_enc_block_size (max encrypted session
1662 * length) + max_md_size (HMAC).
1664 if (!BUF_MEM_grow(s->init_buf,
1665 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1666 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1668 senc = OPENSSL_malloc(slen);
1672 i2d_SSL_SESSION(s->session, &p);
1674 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1675 EVP_CIPHER_CTX_init(&ctx);
1676 HMAC_CTX_init(&hctx);
1677 /* Initialize HMAC and cipher contexts. If callback present
1678 * it does all the work otherwise use generated values
1681 if (tctx->tlsext_ticket_key_cb)
1683 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1692 RAND_pseudo_bytes(iv, 16);
1693 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1694 tctx->tlsext_tick_aes_key, iv);
1695 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1696 tlsext_tick_md(), NULL);
1697 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1699 l2n(s->session->tlsext_tick_lifetime_hint, p);
1700 /* Skip ticket length for now */
1702 /* Output key name */
1704 memcpy(p, key_name, 16);
1707 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1708 p += EVP_CIPHER_CTX_iv_length(&ctx);
1709 /* Encrypt session data */
1710 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1712 EVP_EncryptFinal(&ctx, p, &len);
1714 EVP_CIPHER_CTX_cleanup(&ctx);
1716 HMAC_Update(&hctx, macstart, p - macstart);
1717 HMAC_Final(&hctx, p, &hlen);
1718 HMAC_CTX_cleanup(&hctx);
1721 /* Now write out lengths: p points to end of data written */
1723 len = p - (unsigned char *)(s->init_buf->data);
1725 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1726 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1728 /* number of bytes to write */
1730 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1734 /* XDTLS: set message header ? */
1735 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1736 dtls1_set_message_header(s, (void *)s->init_buf->data,
1737 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1739 /* buffer the message to handle re-xmits */
1740 dtls1_buffer_message(s, 0);
1743 /* SSL3_ST_SW_SESSION_TICKET_B */
1744 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));