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))
249 s->d1->change_cipher_spec_ok = 0;
250 /* Should have been reset by ssl3_get_finished, too. */
251 s->s3->change_cipher_spec = 0;
253 if (s->state != SSL_ST_RENEGOTIATE)
255 /* Ok, we now need to push on a buffering BIO so that
256 * the output is sent in a way that TCP likes :-)
257 * ...but not with SCTP :-)
259 #ifndef OPENSSL_NO_SCTP
260 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
262 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
264 ssl3_init_finished_mac(s);
265 s->state=SSL3_ST_SR_CLNT_HELLO_A;
266 s->ctx->stats.sess_accept++;
270 /* s->state == SSL_ST_RENEGOTIATE,
271 * we will just send a HelloRequest */
272 s->ctx->stats.sess_accept_renegotiate++;
273 s->state=SSL3_ST_SW_HELLO_REQ_A;
278 case SSL3_ST_SW_HELLO_REQ_A:
279 case SSL3_ST_SW_HELLO_REQ_B:
282 dtls1_clear_record_buffer(s);
283 dtls1_start_timer(s);
284 ret=dtls1_send_hello_request(s);
285 if (ret <= 0) goto end;
286 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
287 s->state=SSL3_ST_SW_FLUSH;
290 ssl3_init_finished_mac(s);
293 case SSL3_ST_SW_HELLO_REQ_C:
297 case SSL3_ST_SR_CLNT_HELLO_A:
298 case SSL3_ST_SR_CLNT_HELLO_B:
299 case SSL3_ST_SR_CLNT_HELLO_C:
302 ret=ssl3_get_client_hello(s);
303 if (ret <= 0) goto end;
306 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
307 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
309 s->state = SSL3_ST_SW_SRVR_HELLO_A;
313 /* Reflect ClientHello sequence to remain stateless while listening */
316 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
319 /* If we're just listening, stop here */
320 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
324 /* Set expected sequence numbers
325 * to continue the handshake.
327 s->d1->handshake_read_seq = 2;
328 s->d1->handshake_write_seq = 1;
329 s->d1->next_handshake_write_seq = 1;
335 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
336 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
338 ret = dtls1_send_hello_verify_request(s);
339 if ( ret <= 0) goto end;
340 s->state=SSL3_ST_SW_FLUSH;
341 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
343 /* HelloVerifyRequest resets Finished MAC */
344 if (s->version != DTLS1_BAD_VER)
345 ssl3_init_finished_mac(s);
348 #ifndef OPENSSL_NO_SCTP
349 case DTLS1_SCTP_ST_SR_READ_SOCK:
351 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
353 s->s3->in_read_app_data=2;
354 s->rwstate=SSL_READING;
355 BIO_clear_retry_flags(SSL_get_rbio(s));
356 BIO_set_retry_read(SSL_get_rbio(s));
361 s->state=SSL3_ST_SR_FINISHED_A;
364 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
365 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
366 if (ret < 0) goto end;
370 if (s->d1->next_state != SSL_ST_OK)
372 s->s3->in_read_app_data=2;
373 s->rwstate=SSL_READING;
374 BIO_clear_retry_flags(SSL_get_rbio(s));
375 BIO_set_retry_read(SSL_get_rbio(s));
381 s->state=s->d1->next_state;
385 case SSL3_ST_SW_SRVR_HELLO_A:
386 case SSL3_ST_SW_SRVR_HELLO_B:
388 dtls1_start_timer(s);
389 ret=dtls1_send_server_hello(s);
390 if (ret <= 0) goto end;
394 #ifndef OPENSSL_NO_SCTP
395 /* Add new shared key for SCTP-Auth,
396 * will be ignored if no SCTP used.
398 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
399 DTLS1_SCTP_AUTH_LABEL);
401 SSL_export_keying_material(s, sctpauthkey,
402 sizeof(sctpauthkey), labelbuffer,
403 sizeof(labelbuffer), NULL, 0, 0);
405 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
406 sizeof(sctpauthkey), sctpauthkey);
408 #ifndef OPENSSL_NO_TLSEXT
409 if (s->tlsext_ticket_expected)
410 s->state=SSL3_ST_SW_SESSION_TICKET_A;
412 s->state=SSL3_ST_SW_CHANGE_A;
414 s->state=SSL3_ST_SW_CHANGE_A;
418 s->state=SSL3_ST_SW_CERT_A;
422 case SSL3_ST_SW_CERT_A:
423 case SSL3_ST_SW_CERT_B:
424 /* Check if it is anon DH or normal PSK */
425 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
426 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
428 dtls1_start_timer(s);
429 ret=dtls1_send_server_certificate(s);
430 if (ret <= 0) goto end;
431 #ifndef OPENSSL_NO_TLSEXT
432 if (s->tlsext_status_expected)
433 s->state=SSL3_ST_SW_CERT_STATUS_A;
435 s->state=SSL3_ST_SW_KEY_EXCH_A;
440 s->state=SSL3_ST_SW_KEY_EXCH_A;
447 s->state=SSL3_ST_SW_KEY_EXCH_A;
452 case SSL3_ST_SW_KEY_EXCH_A:
453 case SSL3_ST_SW_KEY_EXCH_B:
454 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
456 /* clear this, it may get reset by
457 * send_server_key_exchange */
458 if ((s->options & SSL_OP_EPHEMERAL_RSA)
459 #ifndef OPENSSL_NO_KRB5
460 && !(alg_k & SSL_kKRB5)
461 #endif /* OPENSSL_NO_KRB5 */
463 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
464 * even when forbidden by protocol specs
465 * (handshake may fail as clients are not required to
466 * be able to handle this) */
467 s->s3->tmp.use_rsa_tmp=1;
469 s->s3->tmp.use_rsa_tmp=0;
471 /* only send if a DH key exchange or
472 * RSA but we have a sign only certificate */
473 if (s->s3->tmp.use_rsa_tmp
474 /* PSK: send ServerKeyExchange if PSK identity
475 * hint if provided */
476 #ifndef OPENSSL_NO_PSK
477 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
479 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
480 || (alg_k & SSL_kEECDH)
481 || ((alg_k & SSL_kRSA)
482 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
483 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
484 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
490 dtls1_start_timer(s);
491 ret=dtls1_send_server_key_exchange(s);
492 if (ret <= 0) goto end;
497 s->state=SSL3_ST_SW_CERT_REQ_A;
501 case SSL3_ST_SW_CERT_REQ_A:
502 case SSL3_ST_SW_CERT_REQ_B:
503 if (/* don't request cert unless asked for it: */
504 !(s->verify_mode & SSL_VERIFY_PEER) ||
505 /* if SSL_VERIFY_CLIENT_ONCE is set,
506 * don't request cert during re-negotiation: */
507 ((s->session->peer != NULL) &&
508 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
509 /* never request cert in anonymous ciphersuites
510 * (see section "Certificate request" in SSL 3 drafts
511 * and in RFC 2246): */
512 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
513 /* ... except when the application insists on verification
514 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
515 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
516 /* never request cert in Kerberos ciphersuites */
517 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
518 /* With normal PSK Certificates and
519 * Certificate Requests are omitted */
520 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
522 /* no cert request */
524 s->s3->tmp.cert_request=0;
525 s->state=SSL3_ST_SW_SRVR_DONE_A;
526 #ifndef OPENSSL_NO_SCTP
527 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
529 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
530 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
536 s->s3->tmp.cert_request=1;
537 dtls1_start_timer(s);
538 ret=dtls1_send_certificate_request(s);
539 if (ret <= 0) goto end;
540 #ifndef NETSCAPE_HANG_BUG
541 s->state=SSL3_ST_SW_SRVR_DONE_A;
542 #ifndef OPENSSL_NO_SCTP
543 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
545 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
546 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
550 s->state=SSL3_ST_SW_FLUSH;
551 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
552 #ifndef OPENSSL_NO_SCTP
553 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
555 s->d1->next_state = s->s3->tmp.next_state;
556 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
564 case SSL3_ST_SW_SRVR_DONE_A:
565 case SSL3_ST_SW_SRVR_DONE_B:
566 dtls1_start_timer(s);
567 ret=dtls1_send_server_done(s);
568 if (ret <= 0) goto end;
569 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
570 s->state=SSL3_ST_SW_FLUSH;
574 case SSL3_ST_SW_FLUSH:
575 s->rwstate=SSL_WRITING;
576 if (BIO_flush(s->wbio) <= 0)
578 /* If the write error was fatal, stop trying */
579 if (!BIO_should_retry(s->wbio))
581 s->rwstate=SSL_NOTHING;
582 s->state=s->s3->tmp.next_state;
588 s->rwstate=SSL_NOTHING;
589 s->state=s->s3->tmp.next_state;
592 case SSL3_ST_SR_CERT_A:
593 case SSL3_ST_SR_CERT_B:
594 /* Check for second client hello (MS SGC) */
595 ret = ssl3_check_client_hello(s);
601 s->state = SSL3_ST_SR_CLNT_HELLO_C;
604 if (s->s3->tmp.cert_request)
606 ret=ssl3_get_client_certificate(s);
607 if (ret <= 0) goto end;
610 s->state=SSL3_ST_SR_KEY_EXCH_A;
614 case SSL3_ST_SR_KEY_EXCH_A:
615 case SSL3_ST_SR_KEY_EXCH_B:
616 ret=ssl3_get_client_key_exchange(s);
617 if (ret <= 0) goto end;
618 #ifndef OPENSSL_NO_SCTP
619 /* Add new shared key for SCTP-Auth,
620 * will be ignored if no SCTP used.
622 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
623 DTLS1_SCTP_AUTH_LABEL);
625 SSL_export_keying_material(s, sctpauthkey,
626 sizeof(sctpauthkey), labelbuffer,
627 sizeof(labelbuffer), NULL, 0, 0);
629 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
630 sizeof(sctpauthkey), sctpauthkey);
633 s->state=SSL3_ST_SR_CERT_VRFY_A;
638 /* For the ECDH ciphersuites when
639 * the client sends its ECDH pub key in
640 * a certificate, the CertificateVerify
641 * message is not sent.
643 s->state=SSL3_ST_SR_FINISHED_A;
648 s->state=SSL3_ST_SR_CERT_VRFY_A;
651 /* We need to get hashes here so if there is
652 * a client cert, it can be verified */
653 s->method->ssl3_enc->cert_verify_mac(s,
655 &(s->s3->tmp.cert_verify_md[0]));
656 s->method->ssl3_enc->cert_verify_mac(s,
658 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
662 case SSL3_ST_SR_CERT_VRFY_A:
663 case SSL3_ST_SR_CERT_VRFY_B:
665 * This *should* be the first time we enable CCS, but be
666 * extra careful about surrounding code changes. We need
667 * to set this here because we don't know if we're
668 * expecting a CertificateVerify or not.
670 if (!s->s3->change_cipher_spec)
671 s->d1->change_cipher_spec_ok = 1;
672 /* we should decide if we expected this one */
673 ret=ssl3_get_cert_verify(s);
674 if (ret <= 0) goto end;
675 #ifndef OPENSSL_NO_SCTP
676 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
677 state == SSL_ST_RENEGOTIATE)
678 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
681 s->state=SSL3_ST_SR_FINISHED_A;
685 case SSL3_ST_SR_FINISHED_A:
686 case SSL3_ST_SR_FINISHED_B:
688 * Enable CCS for resumed handshakes.
689 * In a full handshake, we end up here through
690 * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was
691 * already set. Receiving a CCS clears the flag, so make
692 * sure not to re-enable it to ban duplicates.
693 * s->s3->change_cipher_spec is set when a CCS is
694 * processed in d1_pkt.c, and remains set until
695 * the client's Finished message is read.
697 if (!s->s3->change_cipher_spec)
698 s->d1->change_cipher_spec_ok = 1;
699 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
700 SSL3_ST_SR_FINISHED_B);
701 if (ret <= 0) goto end;
705 #ifndef OPENSSL_NO_TLSEXT
706 else if (s->tlsext_ticket_expected)
707 s->state=SSL3_ST_SW_SESSION_TICKET_A;
710 s->state=SSL3_ST_SW_CHANGE_A;
714 #ifndef OPENSSL_NO_TLSEXT
715 case SSL3_ST_SW_SESSION_TICKET_A:
716 case SSL3_ST_SW_SESSION_TICKET_B:
717 ret=dtls1_send_newsession_ticket(s);
718 if (ret <= 0) goto end;
719 s->state=SSL3_ST_SW_CHANGE_A;
723 case SSL3_ST_SW_CERT_STATUS_A:
724 case SSL3_ST_SW_CERT_STATUS_B:
725 ret=ssl3_send_cert_status(s);
726 if (ret <= 0) goto end;
727 s->state=SSL3_ST_SW_KEY_EXCH_A;
733 case SSL3_ST_SW_CHANGE_A:
734 case SSL3_ST_SW_CHANGE_B:
736 s->session->cipher=s->s3->tmp.new_cipher;
737 if (!s->method->ssl3_enc->setup_key_block(s))
738 { ret= -1; goto end; }
740 ret=dtls1_send_change_cipher_spec(s,
741 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
743 if (ret <= 0) goto end;
745 #ifndef OPENSSL_NO_SCTP
748 /* Change to new shared key of SCTP-Auth,
749 * will be ignored if no SCTP used.
751 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
755 s->state=SSL3_ST_SW_FINISHED_A;
758 if (!s->method->ssl3_enc->change_cipher_state(s,
759 SSL3_CHANGE_CIPHER_SERVER_WRITE))
765 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
768 case SSL3_ST_SW_FINISHED_A:
769 case SSL3_ST_SW_FINISHED_B:
770 ret=dtls1_send_finished(s,
771 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
772 s->method->ssl3_enc->server_finished_label,
773 s->method->ssl3_enc->server_finished_label_len);
774 if (ret <= 0) goto end;
775 s->state=SSL3_ST_SW_FLUSH;
778 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
780 #ifndef OPENSSL_NO_SCTP
781 /* Change to new shared key of SCTP-Auth,
782 * will be ignored if no SCTP used.
784 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
789 s->s3->tmp.next_state=SSL_ST_OK;
790 #ifndef OPENSSL_NO_SCTP
791 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
793 s->d1->next_state = s->s3->tmp.next_state;
794 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
802 /* clean a few things up */
803 ssl3_cleanup_key_block(s);
806 BUF_MEM_free(s->init_buf);
810 /* remove buffering on output */
811 ssl_free_wbio_buffer(s);
815 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
820 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
822 s->ctx->stats.sess_accept_good++;
824 s->handshake_func=dtls1_accept;
826 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
831 /* done handshaking, next message is client hello */
832 s->d1->handshake_read_seq = 0;
833 /* next message is server hello */
834 s->d1->handshake_write_seq = 0;
835 s->d1->next_handshake_write_seq = 0;
840 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
846 if (!s->s3->tmp.reuse_message && !skip)
850 if ((ret=BIO_flush(s->wbio)) <= 0)
855 if ((cb != NULL) && (s->state != state))
859 cb(s,SSL_CB_ACCEPT_LOOP,1);
866 /* BIO_flush(s->wbio); */
869 #ifndef OPENSSL_NO_SCTP
870 /* Notify SCTP BIO socket to leave handshake
871 * mode and prevent stream identifier other
872 * than 0. Will be ignored if no SCTP is used.
874 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
878 cb(s,SSL_CB_ACCEPT_EXIT,ret);
882 int dtls1_send_hello_request(SSL *s)
886 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
888 p=(unsigned char *)s->init_buf->data;
889 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
891 s->state=SSL3_ST_SW_HELLO_REQ_B;
892 /* number of bytes to write */
893 s->init_num=DTLS1_HM_HEADER_LENGTH;
896 /* no need to buffer this message, since there are no retransmit
900 /* SSL3_ST_SW_HELLO_REQ_B */
901 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
904 int dtls1_send_hello_verify_request(SSL *s)
906 unsigned int msg_len;
907 unsigned char *msg, *buf, *p;
909 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
911 buf = (unsigned char *)s->init_buf->data;
913 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
914 *(p++) = s->version >> 8;
915 *(p++) = s->version & 0xFF;
917 if (s->ctx->app_gen_cookie_cb == NULL ||
918 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
919 &(s->d1->cookie_len)) == 0)
921 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
925 *(p++) = (unsigned char) s->d1->cookie_len;
926 memcpy(p, s->d1->cookie, s->d1->cookie_len);
927 p += s->d1->cookie_len;
930 dtls1_set_message_header(s, buf,
931 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
933 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
934 /* number of bytes to write */
939 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
940 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
943 int dtls1_send_server_hello(SSL *s)
951 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
953 buf=(unsigned char *)s->init_buf->data;
954 p=s->s3->server_random;
955 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
956 /* Do the message type and length last */
957 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
959 *(p++)=s->version>>8;
960 *(p++)=s->version&0xff;
963 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
966 /* now in theory we have 3 options to sending back the
967 * session id. If it is a re-use, we send back the
968 * old session-id, if it is a new session, we send
969 * back the new session-id or we send back a 0 length
970 * session-id if we want it to be single use.
971 * Currently I will not implement the '0' length session-id
972 * 12-Jan-98 - I'll now support the '0' length stuff.
974 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
975 s->session->session_id_length=0;
977 sl=s->session->session_id_length;
978 if (sl > sizeof s->session->session_id)
980 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
984 memcpy(p,s->session->session_id,sl);
988 if (s->s3->tmp.new_cipher == NULL)
990 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
993 /* put the compression method */
994 #ifdef OPENSSL_NO_COMP
997 if (s->s3->tmp.new_compression == NULL)
1000 *(p++)=s->s3->tmp.new_compression->id;
1003 #ifndef OPENSSL_NO_TLSEXT
1004 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1006 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1009 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1011 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1020 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
1022 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1023 /* number of bytes to write */
1027 /* buffer the message to handle re-xmits */
1028 dtls1_buffer_message(s, 0);
1031 /* SSL3_ST_SW_SRVR_HELLO_B */
1032 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1035 int dtls1_send_server_done(SSL *s)
1039 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1041 p=(unsigned char *)s->init_buf->data;
1044 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1046 s->state=SSL3_ST_SW_SRVR_DONE_B;
1047 /* number of bytes to write */
1048 s->init_num=DTLS1_HM_HEADER_LENGTH;
1051 /* buffer the message to handle re-xmits */
1052 dtls1_buffer_message(s, 0);
1055 /* SSL3_ST_SW_SRVR_DONE_B */
1056 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1059 int dtls1_send_server_key_exchange(SSL *s)
1061 #ifndef OPENSSL_NO_RSA
1065 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1068 #ifndef OPENSSL_NO_DH
1071 #ifndef OPENSSL_NO_ECDH
1072 EC_KEY *ecdh=NULL, *ecdhp;
1073 unsigned char *encodedPoint = NULL;
1076 BN_CTX *bn_ctx = NULL;
1079 unsigned char *p,*d;
1089 EVP_MD_CTX_init(&md_ctx);
1090 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1092 type=s->s3->tmp.new_cipher->algorithm_mkey;
1097 r[0]=r[1]=r[2]=r[3]=NULL;
1099 #ifndef OPENSSL_NO_RSA
1100 if (type & SSL_kRSA)
1103 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1105 rsa=s->cert->rsa_tmp_cb(s,
1106 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1107 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1110 al=SSL_AD_HANDSHAKE_FAILURE;
1111 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1119 al=SSL_AD_HANDSHAKE_FAILURE;
1120 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1125 s->s3->tmp.use_rsa_tmp=1;
1129 #ifndef OPENSSL_NO_DH
1130 if (type & SSL_kEDH)
1133 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1134 dhp=s->cert->dh_tmp_cb(s,
1135 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1136 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1139 al=SSL_AD_HANDSHAKE_FAILURE;
1140 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1144 if (s->s3->tmp.dh != NULL)
1147 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1151 if ((dh=DHparams_dup(dhp)) == NULL)
1153 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1158 if ((dhp->pub_key == NULL ||
1159 dhp->priv_key == NULL ||
1160 (s->options & SSL_OP_SINGLE_DH_USE)))
1162 if(!DH_generate_key(dh))
1164 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1171 dh->pub_key=BN_dup(dhp->pub_key);
1172 dh->priv_key=BN_dup(dhp->priv_key);
1173 if ((dh->pub_key == NULL) ||
1174 (dh->priv_key == NULL))
1176 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1186 #ifndef OPENSSL_NO_ECDH
1187 if (type & SSL_kEECDH)
1189 const EC_GROUP *group;
1191 ecdhp=cert->ecdh_tmp;
1192 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1194 ecdhp=s->cert->ecdh_tmp_cb(s,
1195 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1196 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1200 al=SSL_AD_HANDSHAKE_FAILURE;
1201 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1205 if (s->s3->tmp.ecdh != NULL)
1207 EC_KEY_free(s->s3->tmp.ecdh);
1208 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1212 /* Duplicate the ECDH structure. */
1215 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1218 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1220 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1224 s->s3->tmp.ecdh=ecdh;
1225 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1226 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1227 (s->options & SSL_OP_SINGLE_ECDH_USE))
1229 if(!EC_KEY_generate_key(ecdh))
1231 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1236 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1237 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1238 (EC_KEY_get0_private_key(ecdh) == NULL))
1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1244 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1245 (EC_GROUP_get_degree(group) > 163))
1247 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1251 /* XXX: For now, we only support ephemeral ECDH
1252 * keys over named (not generic) curves. For
1253 * supported named curves, curve_id is non-zero.
1256 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1259 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1263 /* Encode the public key.
1264 * First check the size of encoding and
1265 * allocate memory accordingly.
1267 encodedlen = EC_POINT_point2oct(group,
1268 EC_KEY_get0_public_key(ecdh),
1269 POINT_CONVERSION_UNCOMPRESSED,
1272 encodedPoint = (unsigned char *)
1273 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1274 bn_ctx = BN_CTX_new();
1275 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1277 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1282 encodedlen = EC_POINT_point2oct(group,
1283 EC_KEY_get0_public_key(ecdh),
1284 POINT_CONVERSION_UNCOMPRESSED,
1285 encodedPoint, encodedlen, bn_ctx);
1287 if (encodedlen == 0)
1289 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1293 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1295 /* XXX: For now, we only support named (not
1296 * generic) curves in ECDH ephemeral key exchanges.
1297 * In this situation, we need four additional bytes
1298 * to encode the entire ServerECDHParams
1303 /* We'll generate the serverKeyExchange message
1304 * explicitly so we can set these to NULLs
1312 #endif /* !OPENSSL_NO_ECDH */
1313 #ifndef OPENSSL_NO_PSK
1314 if (type & SSL_kPSK)
1316 /* reserve size for record length and PSK identity hint*/
1317 n+=2+strlen(s->ctx->psk_identity_hint);
1320 #endif /* !OPENSSL_NO_PSK */
1322 al=SSL_AD_HANDSHAKE_FAILURE;
1323 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1326 for (i=0; r[i] != NULL; i++)
1328 nr[i]=BN_num_bytes(r[i]);
1332 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1333 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1335 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1338 al=SSL_AD_DECODE_ERROR;
1341 kn=EVP_PKEY_size(pkey);
1349 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1351 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1354 d=(unsigned char *)s->init_buf->data;
1355 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1357 for (i=0; r[i] != NULL; i++)
1364 #ifndef OPENSSL_NO_ECDH
1365 if (type & SSL_kEECDH)
1367 /* XXX: For now, we only support named (not generic) curves.
1368 * In this situation, the serverKeyExchange message has:
1369 * [1 byte CurveType], [2 byte CurveName]
1370 * [1 byte length of encoded point], followed by
1371 * the actual encoded point itself
1373 *p = NAMED_CURVE_TYPE;
1381 memcpy((unsigned char*)p,
1382 (unsigned char *)encodedPoint,
1384 OPENSSL_free(encodedPoint);
1385 encodedPoint = NULL;
1390 #ifndef OPENSSL_NO_PSK
1391 if (type & SSL_kPSK)
1393 /* copy PSK identity hint */
1394 s2n(strlen(s->ctx->psk_identity_hint), p);
1395 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1396 p+=strlen(s->ctx->psk_identity_hint);
1403 /* n is the length of the params, they start at
1404 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1406 #ifndef OPENSSL_NO_RSA
1407 if (pkey->type == EVP_PKEY_RSA)
1411 for (num=2; num > 0; num--)
1413 EVP_DigestInit_ex(&md_ctx,(num == 2)
1414 ?s->ctx->md5:s->ctx->sha1, NULL);
1415 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1416 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1417 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1418 EVP_DigestFinal_ex(&md_ctx,q,
1419 (unsigned int *)&i);
1423 if (RSA_sign(NID_md5_sha1, md_buf, j,
1424 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1426 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1434 #if !defined(OPENSSL_NO_DSA)
1435 if (pkey->type == EVP_PKEY_DSA)
1438 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1439 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1440 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1441 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1442 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1443 (unsigned int *)&i,pkey))
1445 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1453 #if !defined(OPENSSL_NO_ECDSA)
1454 if (pkey->type == EVP_PKEY_EC)
1456 /* let's do ECDSA */
1457 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1458 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1459 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1460 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1461 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1462 (unsigned int *)&i,pkey))
1464 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1473 /* Is this error check actually needed? */
1474 al=SSL_AD_HANDSHAKE_FAILURE;
1475 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1480 d = dtls1_set_message_header(s, d,
1481 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1483 /* we should now have things packed up, so lets send
1485 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1488 /* buffer the message to handle re-xmits */
1489 dtls1_buffer_message(s, 0);
1492 s->state = SSL3_ST_SW_KEY_EXCH_B;
1493 EVP_MD_CTX_cleanup(&md_ctx);
1494 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1496 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1498 #ifndef OPENSSL_NO_ECDH
1499 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1500 BN_CTX_free(bn_ctx);
1502 EVP_MD_CTX_cleanup(&md_ctx);
1506 int dtls1_send_certificate_request(SSL *s)
1508 unsigned char *p,*d;
1510 STACK_OF(X509_NAME) *sk=NULL;
1513 unsigned int msg_len;
1515 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1519 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1521 /* get the list of acceptable cert types */
1523 n=ssl3_get_req_cert_type(s,p);
1532 sk=SSL_get_client_CA_list(s);
1536 for (i=0; i<sk_X509_NAME_num(sk); i++)
1538 name=sk_X509_NAME_value(sk,i);
1539 j=i2d_X509_NAME(name,NULL);
1540 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1542 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1545 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1546 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1549 i2d_X509_NAME(name,&p);
1556 i2d_X509_NAME(name,&p);
1557 j-=2; s2n(j,d); j+=2;
1563 /* else no CA names */
1564 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1567 d=(unsigned char *)buf->data;
1568 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1570 s2n(s->d1->handshake_write_seq,d);
1571 s->d1->handshake_write_seq++;
1573 /* we should now have things packed up, so lets send
1576 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1578 #ifdef NETSCAPE_HANG_BUG
1579 /* XXX: what to do about this? */
1580 p=(unsigned char *)s->init_buf->data + s->init_num;
1583 *(p++)=SSL3_MT_SERVER_DONE;
1590 /* XDTLS: set message header ? */
1591 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1592 dtls1_set_message_header(s, (void *)s->init_buf->data,
1593 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1595 /* buffer the message to handle re-xmits */
1596 dtls1_buffer_message(s, 0);
1598 s->state = SSL3_ST_SW_CERT_REQ_B;
1601 /* SSL3_ST_SW_CERT_REQ_B */
1602 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1607 int dtls1_send_server_certificate(SSL *s)
1612 if (s->state == SSL3_ST_SW_CERT_A)
1614 x=ssl_get_server_send_cert(s);
1617 /* VRS: allow null cert if auth == KRB5 */
1618 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1619 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1621 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1626 l=dtls1_output_cert_chain(s,x);
1627 s->state=SSL3_ST_SW_CERT_B;
1631 /* buffer the message to handle re-xmits */
1632 dtls1_buffer_message(s, 0);
1635 /* SSL3_ST_SW_CERT_B */
1636 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1639 #ifndef OPENSSL_NO_TLSEXT
1640 int dtls1_send_newsession_ticket(SSL *s)
1642 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1644 unsigned char *p, *senc, *macstart;
1646 unsigned int hlen, msg_len;
1649 SSL_CTX *tctx = s->initial_ctx;
1650 unsigned char iv[EVP_MAX_IV_LENGTH];
1651 unsigned char key_name[16];
1653 /* get session encoding length */
1654 slen = i2d_SSL_SESSION(s->session, NULL);
1655 /* Some length values are 16 bits, so forget it if session is
1660 /* Grow buffer if need be: the length calculation is as
1661 * follows 12 (DTLS handshake message header) +
1662 * 4 (ticket lifetime hint) + 2 (ticket length) +
1663 * 16 (key name) + max_iv_len (iv length) +
1664 * session_length + max_enc_block_size (max encrypted session
1665 * length) + max_md_size (HMAC).
1667 if (!BUF_MEM_grow(s->init_buf,
1668 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1669 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1671 senc = OPENSSL_malloc(slen);
1675 i2d_SSL_SESSION(s->session, &p);
1677 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1678 EVP_CIPHER_CTX_init(&ctx);
1679 HMAC_CTX_init(&hctx);
1680 /* Initialize HMAC and cipher contexts. If callback present
1681 * it does all the work otherwise use generated values
1684 if (tctx->tlsext_ticket_key_cb)
1686 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1695 RAND_pseudo_bytes(iv, 16);
1696 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1697 tctx->tlsext_tick_aes_key, iv);
1698 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1699 tlsext_tick_md(), NULL);
1700 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1702 l2n(s->session->tlsext_tick_lifetime_hint, p);
1703 /* Skip ticket length for now */
1705 /* Output key name */
1707 memcpy(p, key_name, 16);
1710 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1711 p += EVP_CIPHER_CTX_iv_length(&ctx);
1712 /* Encrypt session data */
1713 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1715 EVP_EncryptFinal(&ctx, p, &len);
1717 EVP_CIPHER_CTX_cleanup(&ctx);
1719 HMAC_Update(&hctx, macstart, p - macstart);
1720 HMAC_Final(&hctx, p, &hlen);
1721 HMAC_CTX_cleanup(&hctx);
1724 /* Now write out lengths: p points to end of data written */
1726 len = p - (unsigned char *)(s->init_buf->data);
1728 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1729 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1731 /* number of bytes to write */
1733 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1737 /* XDTLS: set message header ? */
1738 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1739 dtls1_set_message_header(s, (void *)s->init_buf->data,
1740 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1742 /* buffer the message to handle re-xmits */
1743 dtls1_buffer_message(s, 0);
1746 /* SSL3_ST_SW_SESSION_TICKET_B */
1747 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));