3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2005 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 "kssl_lcl.h"
119 #include <openssl/buffer.h>
120 #include <openssl/rand.h>
121 #include <openssl/objects.h>
122 #include <openssl/evp.h>
123 #include <openssl/md5.h>
124 #ifndef OPENSSL_NO_DH
125 # include <openssl/dh.h>
128 static SSL_METHOD *dtls1_get_client_method(int ver);
129 static int dtls1_get_hello_verify(SSL *s);
131 static SSL_METHOD *dtls1_get_client_method(int ver)
133 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
134 return (DTLSv1_client_method());
139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
140 ssl_undefined_function,
141 dtls1_connect, dtls1_get_client_method)
143 int dtls1_connect(SSL *s)
146 unsigned long Time = (unsigned long)time(NULL);
147 void (*cb) (const SSL *ssl, int type, int val) = NULL;
149 int new_state, state, skip = 0;;
151 RAND_add(&Time, sizeof(Time), 0);
155 if (s->info_callback != NULL)
156 cb = s->info_callback;
157 else if (s->ctx->info_callback != NULL)
158 cb = s->ctx->info_callback;
161 if (!SSL_in_init(s) || SSL_in_before(s))
168 case SSL_ST_RENEGOTIATE:
170 s->state = SSL_ST_CONNECT;
171 s->ctx->stats.sess_connect_renegotiate++;
175 case SSL_ST_BEFORE | SSL_ST_CONNECT:
176 case SSL_ST_OK | SSL_ST_CONNECT:
180 cb(s, SSL_CB_HANDSHAKE_START, 1);
182 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
183 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
184 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
189 /* s->version=SSL3_VERSION; */
190 s->type = SSL_ST_CONNECT;
192 if (s->init_buf == NULL) {
193 if ((buf = BUF_MEM_new()) == NULL) {
197 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
205 if (!ssl3_setup_buffers(s)) {
210 /* setup buffing BIO */
211 if (!ssl_init_wbio_buffer(s, 0)) {
216 /* don't push the buffering BIO quite yet */
218 s->state = SSL3_ST_CW_CLNT_HELLO_A;
219 s->ctx->stats.sess_connect++;
221 /* mark client_random uninitialized */
222 memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
223 s->d1->send_cookie = 0;
227 case SSL3_ST_CW_CLNT_HELLO_A:
228 case SSL3_ST_CW_CLNT_HELLO_B:
232 /* every DTLS ClientHello resets Finished MAC */
233 ssl3_init_finished_mac(s);
235 dtls1_start_timer(s);
236 ret = dtls1_client_hello(s);
240 if (s->d1->send_cookie) {
241 s->state = SSL3_ST_CW_FLUSH;
242 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
244 s->state = SSL3_ST_CR_SRVR_HELLO_A;
248 /* turn on buffering for the next lot of output */
249 if (s->bbio != s->wbio)
250 s->wbio = BIO_push(s->bbio, s->wbio);
254 case SSL3_ST_CR_SRVR_HELLO_A:
255 case SSL3_ST_CR_SRVR_HELLO_B:
256 ret = ssl3_get_server_hello(s);
261 s->state = SSL3_ST_CR_FINISHED_A;
263 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
268 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
269 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
271 ret = dtls1_get_hello_verify(s);
275 if (s->d1->send_cookie) /* start again, with a cookie */
276 s->state = SSL3_ST_CW_CLNT_HELLO_A;
278 s->state = SSL3_ST_CR_CERT_A;
282 case SSL3_ST_CR_CERT_A:
283 case SSL3_ST_CR_CERT_B:
284 #ifndef OPENSSL_NO_TLSEXT
285 ret = ssl3_check_finished(s);
290 if (s->tlsext_ticket_expected)
291 s->state = SSL3_ST_CR_SESSION_TICKET_A;
293 s->state = SSL3_ST_CR_FINISHED_A;
298 /* Check if it is anon DH */
299 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
300 ret = ssl3_get_server_certificate(s);
303 #ifndef OPENSSL_NO_TLSEXT
304 if (s->tlsext_status_expected)
305 s->state = SSL3_ST_CR_CERT_STATUS_A;
307 s->state = SSL3_ST_CR_KEY_EXCH_A;
310 s->state = SSL3_ST_CR_KEY_EXCH_A;
316 s->state = SSL3_ST_CR_KEY_EXCH_A;
321 case SSL3_ST_CR_KEY_EXCH_A:
322 case SSL3_ST_CR_KEY_EXCH_B:
323 ret = ssl3_get_key_exchange(s);
326 s->state = SSL3_ST_CR_CERT_REQ_A;
330 * at this point we check that we have the required stuff from
333 if (!ssl3_check_cert_and_algorithm(s)) {
339 case SSL3_ST_CR_CERT_REQ_A:
340 case SSL3_ST_CR_CERT_REQ_B:
341 ret = ssl3_get_certificate_request(s);
344 s->state = SSL3_ST_CR_SRVR_DONE_A;
348 case SSL3_ST_CR_SRVR_DONE_A:
349 case SSL3_ST_CR_SRVR_DONE_B:
350 ret = ssl3_get_server_done(s);
354 if (s->s3->tmp.cert_req)
355 s->state = SSL3_ST_CW_CERT_A;
357 s->state = SSL3_ST_CW_KEY_EXCH_A;
362 case SSL3_ST_CW_CERT_A:
363 case SSL3_ST_CW_CERT_B:
364 case SSL3_ST_CW_CERT_C:
365 case SSL3_ST_CW_CERT_D:
366 dtls1_start_timer(s);
367 ret = dtls1_send_client_certificate(s);
370 s->state = SSL3_ST_CW_KEY_EXCH_A;
374 case SSL3_ST_CW_KEY_EXCH_A:
375 case SSL3_ST_CW_KEY_EXCH_B:
376 dtls1_start_timer(s);
377 ret = dtls1_send_client_key_exchange(s);
381 * EAY EAY EAY need to check for DH fix cert sent back
384 * For TLS, cert_req is set to 2, so a cert chain of nothing is
385 * sent, but no verify packet is sent
387 if (s->s3->tmp.cert_req == 1) {
388 s->state = SSL3_ST_CW_CERT_VRFY_A;
390 s->state = SSL3_ST_CW_CHANGE_A;
391 s->s3->change_cipher_spec = 0;
397 case SSL3_ST_CW_CERT_VRFY_A:
398 case SSL3_ST_CW_CERT_VRFY_B:
399 dtls1_start_timer(s);
400 ret = dtls1_send_client_verify(s);
403 s->state = SSL3_ST_CW_CHANGE_A;
405 s->s3->change_cipher_spec = 0;
408 case SSL3_ST_CW_CHANGE_A:
409 case SSL3_ST_CW_CHANGE_B:
411 dtls1_start_timer(s);
412 ret = dtls1_send_change_cipher_spec(s,
414 SSL3_ST_CW_CHANGE_B);
417 s->state = SSL3_ST_CW_FINISHED_A;
420 s->session->cipher = s->s3->tmp.new_cipher;
421 #ifdef OPENSSL_NO_COMP
422 s->session->compress_meth = 0;
424 if (s->s3->tmp.new_compression == NULL)
425 s->session->compress_meth = 0;
427 s->session->compress_meth = s->s3->tmp.new_compression->id;
429 if (!s->method->ssl3_enc->setup_key_block(s)) {
434 if (!s->method->ssl3_enc->change_cipher_state(s,
435 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
441 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
444 case SSL3_ST_CW_FINISHED_A:
445 case SSL3_ST_CW_FINISHED_B:
447 dtls1_start_timer(s);
448 ret = dtls1_send_finished(s,
449 SSL3_ST_CW_FINISHED_A,
450 SSL3_ST_CW_FINISHED_B,
452 ssl3_enc->client_finished_label,
454 ssl3_enc->client_finished_label_len);
457 s->state = SSL3_ST_CW_FLUSH;
460 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
462 s->s3->tmp.next_state = SSL_ST_OK;
463 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
464 s->state = SSL_ST_OK;
465 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
466 s->s3->delay_buf_pop_ret = 0;
469 #ifndef OPENSSL_NO_TLSEXT
471 * Allow NewSessionTicket if ticket expected
473 if (s->tlsext_ticket_expected)
474 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
478 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
484 #ifndef OPENSSL_NO_TLSEXT
485 case SSL3_ST_CR_SESSION_TICKET_A:
486 case SSL3_ST_CR_SESSION_TICKET_B:
487 ret = ssl3_get_new_session_ticket(s);
490 s->state = SSL3_ST_CR_FINISHED_A;
494 case SSL3_ST_CR_CERT_STATUS_A:
495 case SSL3_ST_CR_CERT_STATUS_B:
496 ret = ssl3_get_cert_status(s);
499 s->state = SSL3_ST_CR_KEY_EXCH_A;
504 case SSL3_ST_CR_FINISHED_A:
505 case SSL3_ST_CR_FINISHED_B:
506 s->d1->change_cipher_spec_ok = 1;
507 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
508 SSL3_ST_CR_FINISHED_B);
514 s->state = SSL3_ST_CW_CHANGE_A;
516 s->state = SSL_ST_OK;
520 case SSL3_ST_CW_FLUSH:
521 s->rwstate = SSL_WRITING;
522 if (BIO_flush(s->wbio) <= 0) {
526 s->rwstate = SSL_NOTHING;
527 s->state = s->s3->tmp.next_state;
531 /* clean a few things up */
532 ssl3_cleanup_key_block(s);
535 if (s->init_buf != NULL) {
536 BUF_MEM_free(s->init_buf);
542 * If we are not 'joining' the last two packets, remove the
545 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
546 ssl_free_wbio_buffer(s);
547 /* else do it later in ssl3_write */
552 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
554 s->ctx->stats.sess_hit++;
558 s->handshake_func = dtls1_connect;
559 s->ctx->stats.sess_connect_good++;
562 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
564 /* done with handshaking */
565 s->d1->handshake_read_seq = 0;
566 s->d1->next_handshake_write_seq = 0;
571 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
577 /* did we do anything */
578 if (!s->s3->tmp.reuse_message && !skip) {
580 if ((ret = BIO_flush(s->wbio)) <= 0)
584 if ((cb != NULL) && (s->state != state)) {
585 new_state = s->state;
587 cb(s, SSL_CB_CONNECT_LOOP, 1);
588 s->state = new_state;
598 cb(s, SSL_CB_CONNECT_EXIT, ret);
602 int dtls1_client_hello(SSL *s)
605 unsigned char *p, *d;
607 unsigned long Time, l;
610 buf = (unsigned char *)s->init_buf->data;
611 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
612 SSL_SESSION *sess = s->session;
613 if ((s->session == NULL) || (s->session->ssl_version != s->version) ||
614 #ifdef OPENSSL_NO_TLSEXT
615 !sess->session_id_length ||
617 (!sess->session_id_length && !sess->tlsext_tick) ||
619 (s->session->not_resumable)) {
620 if (!ssl_get_new_session(s, 0))
623 /* else use the pre-loaded session */
625 p = s->s3->client_random;
627 * if client_random is initialized, reuse it, we are required to use
628 * same upon reply to HelloVerify
630 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ;
631 if (i == sizeof(s->s3->client_random)) {
632 Time = (unsigned long)time(NULL); /* Time */
634 RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4);
637 /* Do the message type and length last */
638 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
640 *(p++) = s->version >> 8;
641 *(p++) = s->version & 0xff;
642 s->client_version = s->version;
645 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
646 p += SSL3_RANDOM_SIZE;
652 i = s->session->session_id_length;
655 if (i > sizeof s->session->session_id) {
656 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
659 memcpy(p, s->session->session_id, i);
664 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
665 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
668 *(p++) = s->d1->cookie_len;
669 memcpy(p, s->d1->cookie, s->d1->cookie_len);
670 p += s->d1->cookie_len;
672 /* Ciphers supported */
673 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
675 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
682 if (s->ctx->comp_methods == NULL)
685 j = sk_SSL_COMP_num(s->ctx->comp_methods);
687 for (i = 0; i < j; i++) {
688 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
691 *(p++) = 0; /* Add the NULL method */
693 #ifndef OPENSSL_NO_TLSEXT
695 ssl_add_clienthello_tlsext(s, p,
696 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
698 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
706 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
708 s->state = SSL3_ST_CW_CLNT_HELLO_B;
709 /* number of bytes to write */
710 s->init_num = p - buf;
713 /* buffer the message to handle re-xmits */
714 dtls1_buffer_message(s, 0);
717 /* SSL3_ST_CW_CLNT_HELLO_B */
718 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
723 static int dtls1_get_hello_verify(SSL *s)
727 unsigned int cookie_len;
729 n = s->method->ssl_get_message(s,
730 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
731 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
732 -1, s->max_cert_list, &ok);
737 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
738 s->d1->send_cookie = 0;
739 s->s3->tmp.reuse_message = 1;
743 data = (unsigned char *)s->init_msg;
745 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) {
746 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
747 s->version = (s->version & 0xff00) | data[1];
748 al = SSL_AD_PROTOCOL_VERSION;
753 cookie_len = *(data++);
754 if (cookie_len > sizeof(s->d1->cookie)) {
755 al = SSL_AD_ILLEGAL_PARAMETER;
759 memcpy(s->d1->cookie, data, cookie_len);
760 s->d1->cookie_len = cookie_len;
762 s->d1->send_cookie = 1;
766 ssl3_send_alert(s, SSL3_AL_FATAL, al);
770 int dtls1_send_client_key_exchange(SSL *s)
772 unsigned char *p, *d;
775 #ifndef OPENSSL_NO_RSA
777 EVP_PKEY *pkey = NULL;
779 #ifndef OPENSSL_NO_KRB5
781 #endif /* OPENSSL_NO_KRB5 */
783 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
784 d = (unsigned char *)s->init_buf->data;
785 p = &(d[DTLS1_HM_HEADER_LENGTH]);
787 l = s->s3->tmp.new_cipher->algorithms;
789 /* Fool emacs indentation */
792 #ifndef OPENSSL_NO_RSA
793 else if (l & SSL_kRSA) {
795 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
797 if (s->session->sess_cert == NULL) {
799 * We should always have a server certificate with SSL_kRSA.
801 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
802 ERR_R_INTERNAL_ERROR);
806 if (s->session->sess_cert->peer_rsa_tmp != NULL)
807 rsa = s->session->sess_cert->peer_rsa_tmp;
810 X509_get_pubkey(s->session->
811 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
813 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
814 || (pkey->pkey.rsa == NULL)) {
815 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
816 ERR_R_INTERNAL_ERROR);
819 rsa = pkey->pkey.rsa;
823 tmp_buf[0] = s->client_version >> 8;
824 tmp_buf[1] = s->client_version & 0xff;
825 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
828 s->session->master_key_length = sizeof tmp_buf;
831 /* Fix buf for TLS and [incidentally] DTLS */
832 if (s->version > SSL3_VERSION)
834 n = RSA_public_encrypt(sizeof tmp_buf,
835 tmp_buf, p, rsa, RSA_PKCS1_PADDING);
837 if (s->options & SSL_OP_PKCS1_CHECK_1)
839 if (s->options & SSL_OP_PKCS1_CHECK_2)
843 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
844 SSL_R_BAD_RSA_ENCRYPT);
848 /* Fix buf for TLS and [incidentally] DTLS */
849 if (s->version > SSL3_VERSION) {
854 s->session->master_key_length =
855 s->method->ssl3_enc->generate_master_secret(s,
860 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
863 #ifndef OPENSSL_NO_KRB5
864 else if (l & SSL_kKRB5) {
865 krb5_error_code krb5rc;
866 KSSL_CTX *kssl_ctx = s->kssl_ctx;
867 /* krb5_data krb5_ap_req; */
868 krb5_data *enc_ticket;
869 krb5_data authenticator, *authp = NULL;
870 EVP_CIPHER_CTX ciph_ctx;
871 EVP_CIPHER *enc = NULL;
872 unsigned char iv[EVP_MAX_IV_LENGTH];
873 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
874 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
875 int padl, outl = sizeof(epms);
877 EVP_CIPHER_CTX_init(&ciph_ctx);
880 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
882 # endif /* KSSL_DEBUG */
887 authp = &authenticator;
888 # endif /* KRB5SENDAUTH */
890 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
891 enc = kssl_map_enc(kssl_ctx->enctype);
896 printf("kssl_cget_tkt rtn %d\n", krb5rc);
897 if (krb5rc && kssl_err.text)
898 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
900 # endif /* KSSL_DEBUG */
903 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
904 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
909 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
910 ** in place of RFC 2712 KerberosWrapper, as in:
912 ** Send ticket (copy to *p, set n = length)
913 ** n = krb5_ap_req.length;
914 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
915 ** if (krb5_ap_req.data)
916 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
918 ** Now using real RFC 2712 KerberosWrapper
919 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
920 ** Note: 2712 "opaque" types are here replaced
921 ** with a 2-byte length followed by the value.
923 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
924 ** Where "xx xx" = length bytes. Shown here with
925 ** optional authenticator omitted.
928 /* KerberosWrapper.Ticket */
929 s2n(enc_ticket->length, p);
930 memcpy(p, enc_ticket->data, enc_ticket->length);
931 p += enc_ticket->length;
932 n = enc_ticket->length + 2;
934 /* KerberosWrapper.Authenticator */
935 if (authp && authp->length) {
936 s2n(authp->length, p);
937 memcpy(p, authp->data, authp->length);
939 n += authp->length + 2;
945 s2n(0, p); /* null authenticator length */
949 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0)
953 * 20010420 VRS. Tried it this way; failed.
954 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
955 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
957 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
960 memset(iv, 0, sizeof iv); /* per RFC 1510 */
961 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
962 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
964 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
966 if (outl > sizeof epms) {
967 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
968 ERR_R_INTERNAL_ERROR);
971 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
973 /* KerberosWrapper.EncryptedPreMasterSecret */
975 memcpy(p, epms, outl);
979 s->session->master_key_length =
980 s->method->ssl3_enc->generate_master_secret(s,
986 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
987 OPENSSL_cleanse(epms, outl);
990 #ifndef OPENSSL_NO_DH
991 else if (l & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
992 DH *dh_srvr, *dh_clnt;
994 if (s->session->sess_cert == NULL) {
995 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
996 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
997 SSL_R_UNEXPECTED_MESSAGE);
1001 if (s->session->sess_cert->peer_dh_tmp != NULL)
1002 dh_srvr = s->session->sess_cert->peer_dh_tmp;
1004 /* we get them from the cert */
1005 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1006 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1007 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1011 /* generate a new random key */
1012 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
1013 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1016 if (!DH_generate_key(dh_clnt)) {
1017 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1022 * use the 'p' output buffer for the DH key, but make sure to
1023 * clear it out afterwards
1026 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
1029 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1033 /* generate master key from the result */
1034 s->session->master_key_length =
1035 s->method->ssl3_enc->generate_master_secret(s,
1037 session->master_key,
1042 /* send off the data */
1043 n = BN_num_bytes(dh_clnt->pub_key);
1045 BN_bn2bin(dh_clnt->pub_key, p);
1050 /* perhaps clean things up a bit EAY EAY EAY EAY */
1054 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1055 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1056 ERR_R_INTERNAL_ERROR);
1060 d = dtls1_set_message_header(s, d,
1061 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1063 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1065 l2n(s->d1->handshake_write_seq,d);
1066 s->d1->handshake_write_seq++;
1069 s->state = SSL3_ST_CW_KEY_EXCH_B;
1070 /* number of bytes to write */
1071 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1074 /* buffer the message to handle re-xmits */
1075 dtls1_buffer_message(s, 0);
1078 /* SSL3_ST_CW_KEY_EXCH_B */
1079 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1084 int dtls1_send_client_verify(SSL *s)
1086 unsigned char *p, *d;
1087 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1089 #ifndef OPENSSL_NO_RSA
1093 #ifndef OPENSSL_NO_DSA
1097 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
1098 d = (unsigned char *)s->init_buf->data;
1099 p = &(d[DTLS1_HM_HEADER_LENGTH]);
1100 pkey = s->cert->key->privatekey;
1102 s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
1103 &(data[MD5_DIGEST_LENGTH]));
1105 #ifndef OPENSSL_NO_RSA
1106 if (pkey->type == EVP_PKEY_RSA) {
1107 s->method->ssl3_enc->cert_verify_mac(s,
1108 &(s->s3->finish_dgst1),
1111 (NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
1112 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1113 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
1120 #ifndef OPENSSL_NO_DSA
1121 if (pkey->type == EVP_PKEY_DSA) {
1122 if (!DSA_sign(pkey->save_type,
1123 &(data[MD5_DIGEST_LENGTH]),
1124 SHA_DIGEST_LENGTH, &(p[2]),
1125 (unsigned int *)&j, pkey->pkey.dsa)) {
1126 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
1134 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
1138 d = dtls1_set_message_header(s, d,
1139 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n);
1141 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH;
1144 /* buffer the message to handle re-xmits */
1145 dtls1_buffer_message(s, 0);
1147 s->state = SSL3_ST_CW_CERT_VRFY_B;
1150 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1151 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1156 int dtls1_send_client_certificate(SSL *s)
1159 EVP_PKEY *pkey = NULL;
1163 if (s->state == SSL3_ST_CW_CERT_A) {
1164 if ((s->cert == NULL) ||
1165 (s->cert->key->x509 == NULL) ||
1166 (s->cert->key->privatekey == NULL))
1167 s->state = SSL3_ST_CW_CERT_B;
1169 s->state = SSL3_ST_CW_CERT_C;
1172 /* We need to get a client cert */
1173 if (s->state == SSL3_ST_CW_CERT_B) {
1175 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
1176 * return(-1); We then get retied later
1179 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1181 s->rwstate = SSL_X509_LOOKUP;
1184 s->rwstate = SSL_NOTHING;
1185 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
1186 s->state = SSL3_ST_CW_CERT_B;
1187 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
1189 } else if (i == 1) {
1191 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,
1192 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1198 EVP_PKEY_free(pkey);
1200 if (s->version == SSL3_VERSION) {
1201 s->s3->tmp.cert_req = 0;
1202 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
1205 s->s3->tmp.cert_req = 2;
1209 /* Ok, we have a cert */
1210 s->state = SSL3_ST_CW_CERT_C;
1213 if (s->state == SSL3_ST_CW_CERT_C) {
1214 s->state = SSL3_ST_CW_CERT_D;
1215 l = dtls1_output_cert_chain(s,
1216 (s->s3->tmp.cert_req ==
1217 2) ? NULL : s->cert->key->x509);
1218 s->init_num = (int)l;
1221 /* set header called by dtls1_output_cert_chain() */
1223 /* buffer the message to handle re-xmits */
1224 dtls1_buffer_message(s, 0);
1226 /* SSL3_ST_CW_CERT_D */
1227 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));