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,
142 dtls1_get_client_method)
144 int dtls1_connect(SSL *s)
147 unsigned long Time=(unsigned long)time(NULL),l;
148 void (*cb)(const SSL *ssl,int type,int val)=NULL;
150 int new_state,state,skip=0;;
152 RAND_add(&Time,sizeof(Time),0);
156 if (s->info_callback != NULL)
158 else if (s->ctx->info_callback != NULL)
159 cb=s->ctx->info_callback;
162 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
170 case SSL_ST_RENEGOTIATE:
172 s->state=SSL_ST_CONNECT;
173 s->ctx->stats.sess_connect_renegotiate++;
177 case SSL_ST_BEFORE|SSL_ST_CONNECT:
178 case SSL_ST_OK|SSL_ST_CONNECT:
181 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
183 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
184 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
186 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
191 /* s->version=SSL3_VERSION; */
192 s->type=SSL_ST_CONNECT;
194 if (s->init_buf == NULL)
196 if ((buf=BUF_MEM_new()) == NULL)
201 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
210 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
212 /* setup buffing BIO */
213 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
215 /* don't push the buffering BIO quite yet */
217 s->state=SSL3_ST_CW_CLNT_HELLO_A;
218 s->ctx->stats.sess_connect++;
220 /* mark client_random uninitialized */
221 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
222 s->d1->send_cookie = 0;
226 case SSL3_ST_CW_CLNT_HELLO_A:
227 case SSL3_ST_CW_CLNT_HELLO_B:
231 /* every DTLS ClientHello resets Finished MAC */
232 ssl3_init_finished_mac(s);
234 dtls1_start_timer(s);
235 ret=dtls1_client_hello(s);
236 if (ret <= 0) goto end;
238 if ( s->d1->send_cookie)
240 s->state=SSL3_ST_CW_FLUSH;
241 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);
257 if (ret <= 0) goto end;
262 s->state=SSL3_ST_CR_FINISHED_A;
264 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
269 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
270 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
272 ret = dtls1_get_hello_verify(s);
276 if ( s->d1->send_cookie) /* start again, with a cookie */
277 s->state=SSL3_ST_CW_CLNT_HELLO_A;
279 s->state = SSL3_ST_CR_CERT_A;
283 case SSL3_ST_CR_CERT_A:
284 case SSL3_ST_CR_CERT_B:
285 #ifndef OPENSSL_NO_TLSEXT
286 ret=ssl3_check_finished(s);
287 if (ret <= 0) goto end;
291 if (s->tlsext_ticket_expected)
292 s->state=SSL3_ST_CR_SESSION_TICKET_A;
294 s->state=SSL3_ST_CR_FINISHED_A;
299 /* Check if it is anon DH */
300 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
302 ret=ssl3_get_server_certificate(s);
303 if (ret <= 0) goto end;
304 #ifndef OPENSSL_NO_TLSEXT
305 if (s->tlsext_status_expected)
306 s->state=SSL3_ST_CR_CERT_STATUS_A;
308 s->state=SSL3_ST_CR_KEY_EXCH_A;
313 s->state=SSL3_ST_CR_KEY_EXCH_A;
320 s->state=SSL3_ST_CR_KEY_EXCH_A;
325 case SSL3_ST_CR_KEY_EXCH_A:
326 case SSL3_ST_CR_KEY_EXCH_B:
327 ret=ssl3_get_key_exchange(s);
328 if (ret <= 0) goto end;
329 s->state=SSL3_ST_CR_CERT_REQ_A;
332 /* at this point we check that we have the
333 * required stuff from the server */
334 if (!ssl3_check_cert_and_algorithm(s))
341 case SSL3_ST_CR_CERT_REQ_A:
342 case SSL3_ST_CR_CERT_REQ_B:
343 ret=ssl3_get_certificate_request(s);
344 if (ret <= 0) goto end;
345 s->state=SSL3_ST_CR_SRVR_DONE_A;
349 case SSL3_ST_CR_SRVR_DONE_A:
350 case SSL3_ST_CR_SRVR_DONE_B:
351 ret=ssl3_get_server_done(s);
352 if (ret <= 0) goto end;
353 if (s->s3->tmp.cert_req)
354 s->state=SSL3_ST_CW_CERT_A;
356 s->state=SSL3_ST_CW_KEY_EXCH_A;
361 case SSL3_ST_CW_CERT_A:
362 case SSL3_ST_CW_CERT_B:
363 case SSL3_ST_CW_CERT_C:
364 case SSL3_ST_CW_CERT_D:
365 dtls1_start_timer(s);
366 ret=dtls1_send_client_certificate(s);
367 if (ret <= 0) goto end;
368 s->state=SSL3_ST_CW_KEY_EXCH_A;
372 case SSL3_ST_CW_KEY_EXCH_A:
373 case SSL3_ST_CW_KEY_EXCH_B:
374 dtls1_start_timer(s);
375 ret=dtls1_send_client_key_exchange(s);
376 if (ret <= 0) goto end;
377 l=s->s3->tmp.new_cipher->algorithms;
378 /* EAY EAY EAY need to check for DH fix cert
380 /* For TLS, cert_req is set to 2, so a cert chain
381 * of nothing is sent, but no verify packet is sent */
382 if (s->s3->tmp.cert_req == 1)
384 s->state=SSL3_ST_CW_CERT_VRFY_A;
388 s->state=SSL3_ST_CW_CHANGE_A;
389 s->s3->change_cipher_spec=0;
395 case SSL3_ST_CW_CERT_VRFY_A:
396 case SSL3_ST_CW_CERT_VRFY_B:
397 dtls1_start_timer(s);
398 ret=dtls1_send_client_verify(s);
399 if (ret <= 0) goto end;
400 s->state=SSL3_ST_CW_CHANGE_A;
402 s->s3->change_cipher_spec=0;
405 case SSL3_ST_CW_CHANGE_A:
406 case SSL3_ST_CW_CHANGE_B:
407 dtls1_start_timer(s);
408 ret=dtls1_send_change_cipher_spec(s,
409 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
410 if (ret <= 0) goto end;
411 s->state=SSL3_ST_CW_FINISHED_A;
414 s->session->cipher=s->s3->tmp.new_cipher;
415 #ifdef OPENSSL_NO_COMP
416 s->session->compress_meth=0;
418 if (s->s3->tmp.new_compression == NULL)
419 s->session->compress_meth=0;
421 s->session->compress_meth=
422 s->s3->tmp.new_compression->id;
424 if (!s->method->ssl3_enc->setup_key_block(s))
430 if (!s->method->ssl3_enc->change_cipher_state(s,
431 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
437 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
440 case SSL3_ST_CW_FINISHED_A:
441 case SSL3_ST_CW_FINISHED_B:
442 dtls1_start_timer(s);
443 ret=dtls1_send_finished(s,
444 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
445 s->method->ssl3_enc->client_finished_label,
446 s->method->ssl3_enc->client_finished_label_len);
447 if (ret <= 0) goto end;
448 s->state=SSL3_ST_CW_FLUSH;
451 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
454 s->s3->tmp.next_state=SSL_ST_OK;
455 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
458 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
459 s->s3->delay_buf_pop_ret=0;
464 #ifndef OPENSSL_NO_TLSEXT
465 /* Allow NewSessionTicket if ticket expected */
466 if (s->tlsext_ticket_expected)
467 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
471 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
477 #ifndef OPENSSL_NO_TLSEXT
478 case SSL3_ST_CR_SESSION_TICKET_A:
479 case SSL3_ST_CR_SESSION_TICKET_B:
480 ret=ssl3_get_new_session_ticket(s);
481 if (ret <= 0) goto end;
482 s->state=SSL3_ST_CR_FINISHED_A;
486 case SSL3_ST_CR_CERT_STATUS_A:
487 case SSL3_ST_CR_CERT_STATUS_B:
488 ret=ssl3_get_cert_status(s);
489 if (ret <= 0) goto end;
490 s->state=SSL3_ST_CR_KEY_EXCH_A;
495 case SSL3_ST_CR_FINISHED_A:
496 case SSL3_ST_CR_FINISHED_B:
497 s->d1->change_cipher_spec_ok = 1;
498 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
499 SSL3_ST_CR_FINISHED_B);
500 if (ret <= 0) goto end;
504 s->state=SSL3_ST_CW_CHANGE_A;
510 case SSL3_ST_CW_FLUSH:
511 s->rwstate=SSL_WRITING;
512 if (BIO_flush(s->wbio) <= 0)
517 s->rwstate=SSL_NOTHING;
518 s->state=s->s3->tmp.next_state;
522 /* clean a few things up */
523 ssl3_cleanup_key_block(s);
526 if (s->init_buf != NULL)
528 BUF_MEM_free(s->init_buf);
533 /* If we are not 'joining' the last two packets,
534 * remove the buffering now */
535 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
536 ssl_free_wbio_buffer(s);
537 /* else do it later in ssl3_write */
542 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
543 if (s->hit) s->ctx->stats.sess_hit++;
547 s->handshake_func=dtls1_connect;
548 s->ctx->stats.sess_connect_good++;
550 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
552 /* done with handshaking */
553 s->d1->handshake_read_seq = 0;
554 s->d1->next_handshake_write_seq = 0;
559 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
565 /* did we do anything */
566 if (!s->s3->tmp.reuse_message && !skip)
570 if ((ret=BIO_flush(s->wbio)) <= 0)
574 if ((cb != NULL) && (s->state != state))
578 cb(s,SSL_CB_CONNECT_LOOP,1);
589 cb(s,SSL_CB_CONNECT_EXIT,ret);
593 int dtls1_client_hello(SSL *s)
598 unsigned long Time,l;
601 buf=(unsigned char *)s->init_buf->data;
602 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
604 SSL_SESSION *sess = s->session;
605 if ((s->session == NULL) ||
606 (s->session->ssl_version != s->version) ||
607 #ifdef OPENSSL_NO_TLSEXT
608 !sess->session_id_length ||
610 (!sess->session_id_length && !sess->tlsext_tick) ||
612 (s->session->not_resumable))
614 if (!ssl_get_new_session(s,0))
617 /* else use the pre-loaded session */
619 p=s->s3->client_random;
620 /* if client_random is initialized, reuse it, we are
621 * required to use same upon reply to HelloVerify */
622 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
623 if (i==sizeof(s->s3->client_random))
625 Time=(unsigned long)time(NULL); /* Time */
627 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
630 /* Do the message type and length last */
631 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
633 *(p++)=s->version>>8;
634 *(p++)=s->version&0xff;
635 s->client_version=s->version;
638 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
645 i=s->session->session_id_length;
649 if (i > sizeof s->session->session_id)
651 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
654 memcpy(p,s->session->session_id,i);
659 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
661 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
664 *(p++) = s->d1->cookie_len;
665 memcpy(p, s->d1->cookie, s->d1->cookie_len);
666 p += s->d1->cookie_len;
668 /* Ciphers supported */
669 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
672 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
679 if (s->ctx->comp_methods == NULL)
682 j=sk_SSL_COMP_num(s->ctx->comp_methods);
686 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
689 *(p++)=0; /* Add the NULL method */
691 #ifndef OPENSSL_NO_TLSEXT
692 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
694 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
702 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
704 s->state=SSL3_ST_CW_CLNT_HELLO_B;
705 /* number of bytes to write */
709 /* buffer the message to handle re-xmits */
710 dtls1_buffer_message(s, 0);
713 /* SSL3_ST_CW_CLNT_HELLO_B */
714 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
719 static int dtls1_get_hello_verify(SSL *s)
723 unsigned int cookie_len;
725 n=s->method->ssl_get_message(s,
726 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
727 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
732 if (!ok) return((int)n);
734 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
736 s->d1->send_cookie = 0;
737 s->s3->tmp.reuse_message=1;
741 data = (unsigned char *)s->init_msg;
743 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
745 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
746 s->version=(s->version&0xff00)|data[1];
747 al = SSL_AD_PROTOCOL_VERSION;
752 cookie_len = *(data++);
753 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)
775 #ifndef OPENSSL_NO_RSA
779 #ifndef OPENSSL_NO_KRB5
781 #endif /* OPENSSL_NO_KRB5 */
783 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
785 d=(unsigned char *)s->init_buf->data;
786 p= &(d[DTLS1_HM_HEADER_LENGTH]);
788 l=s->s3->tmp.new_cipher->algorithms;
790 /* Fool emacs indentation */
792 #ifndef OPENSSL_NO_RSA
793 else if (l & SSL_kRSA)
796 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
798 if (s->session->sess_cert->peer_rsa_tmp != NULL)
799 rsa=s->session->sess_cert->peer_rsa_tmp;
802 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
803 if ((pkey == NULL) ||
804 (pkey->type != EVP_PKEY_RSA) ||
805 (pkey->pkey.rsa == NULL))
807 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
814 tmp_buf[0]=s->client_version>>8;
815 tmp_buf[1]=s->client_version&0xff;
816 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
819 s->session->master_key_length=sizeof tmp_buf;
822 /* Fix buf for TLS and [incidentally] DTLS */
823 if (s->version > SSL3_VERSION)
825 n=RSA_public_encrypt(sizeof tmp_buf,
826 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
828 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
829 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
833 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
837 /* Fix buf for TLS and [incidentally] DTLS */
838 if (s->version > SSL3_VERSION)
844 s->session->master_key_length=
845 s->method->ssl3_enc->generate_master_secret(s,
846 s->session->master_key,
847 tmp_buf,sizeof tmp_buf);
848 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
851 #ifndef OPENSSL_NO_KRB5
852 else if (l & SSL_kKRB5)
854 krb5_error_code krb5rc;
855 KSSL_CTX *kssl_ctx = s->kssl_ctx;
856 /* krb5_data krb5_ap_req; */
857 krb5_data *enc_ticket;
858 krb5_data authenticator, *authp = NULL;
859 EVP_CIPHER_CTX ciph_ctx;
860 EVP_CIPHER *enc = NULL;
861 unsigned char iv[EVP_MAX_IV_LENGTH];
862 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
863 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
864 + EVP_MAX_IV_LENGTH];
865 int padl, outl = sizeof(epms);
867 EVP_CIPHER_CTX_init(&ciph_ctx);
870 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
872 #endif /* KSSL_DEBUG */
876 if (KRB5SENDAUTH) authp = &authenticator;
877 #endif /* KRB5SENDAUTH */
879 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
881 enc = kssl_map_enc(kssl_ctx->enctype);
886 printf("kssl_cget_tkt rtn %d\n", krb5rc);
887 if (krb5rc && kssl_err.text)
888 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
890 #endif /* KSSL_DEBUG */
894 ssl3_send_alert(s,SSL3_AL_FATAL,
895 SSL_AD_HANDSHAKE_FAILURE);
896 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
901 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
902 ** in place of RFC 2712 KerberosWrapper, as in:
904 ** Send ticket (copy to *p, set n = length)
905 ** n = krb5_ap_req.length;
906 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
907 ** if (krb5_ap_req.data)
908 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
910 ** Now using real RFC 2712 KerberosWrapper
911 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
912 ** Note: 2712 "opaque" types are here replaced
913 ** with a 2-byte length followed by the value.
915 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
916 ** Where "xx xx" = length bytes. Shown here with
917 ** optional authenticator omitted.
920 /* KerberosWrapper.Ticket */
921 s2n(enc_ticket->length,p);
922 memcpy(p, enc_ticket->data, enc_ticket->length);
923 p+= enc_ticket->length;
924 n = enc_ticket->length + 2;
926 /* KerberosWrapper.Authenticator */
927 if (authp && authp->length)
929 s2n(authp->length,p);
930 memcpy(p, authp->data, authp->length);
932 n+= authp->length + 2;
940 s2n(0,p);/* null authenticator length */
944 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
947 /* 20010420 VRS. Tried it this way; failed.
948 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
949 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
950 ** kssl_ctx->length);
951 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
954 memset(iv, 0, sizeof iv); /* per RFC 1510 */
955 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
957 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
959 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
961 if (outl > sizeof epms)
963 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
966 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
968 /* KerberosWrapper.EncryptedPreMasterSecret */
970 memcpy(p, epms, outl);
974 s->session->master_key_length=
975 s->method->ssl3_enc->generate_master_secret(s,
976 s->session->master_key,
977 tmp_buf, sizeof tmp_buf);
979 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
980 OPENSSL_cleanse(epms, outl);
983 #ifndef OPENSSL_NO_DH
984 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
986 DH *dh_srvr,*dh_clnt;
988 if (s->session->sess_cert->peer_dh_tmp != NULL)
989 dh_srvr=s->session->sess_cert->peer_dh_tmp;
992 /* we get them from the cert */
993 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
994 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
998 /* generate a new random key */
999 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1001 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1004 if (!DH_generate_key(dh_clnt))
1006 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1010 /* use the 'p' output buffer for the DH key, but
1011 * make sure to clear it out afterwards */
1013 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1017 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1021 /* generate master key from the result */
1022 s->session->master_key_length=
1023 s->method->ssl3_enc->generate_master_secret(s,
1024 s->session->master_key,p,n);
1028 /* send off the data */
1029 n=BN_num_bytes(dh_clnt->pub_key);
1031 BN_bn2bin(dh_clnt->pub_key,p);
1036 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1041 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1042 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1046 d = dtls1_set_message_header(s, d,
1047 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1049 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1051 l2n(s->d1->handshake_write_seq,d);
1052 s->d1->handshake_write_seq++;
1055 s->state=SSL3_ST_CW_KEY_EXCH_B;
1056 /* number of bytes to write */
1057 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1060 /* buffer the message to handle re-xmits */
1061 dtls1_buffer_message(s, 0);
1064 /* SSL3_ST_CW_KEY_EXCH_B */
1065 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1070 int dtls1_send_client_verify(SSL *s)
1072 unsigned char *p,*d;
1073 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1075 #ifndef OPENSSL_NO_RSA
1079 #ifndef OPENSSL_NO_DSA
1083 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1085 d=(unsigned char *)s->init_buf->data;
1086 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1087 pkey=s->cert->key->privatekey;
1089 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1090 &(data[MD5_DIGEST_LENGTH]));
1092 #ifndef OPENSSL_NO_RSA
1093 if (pkey->type == EVP_PKEY_RSA)
1095 s->method->ssl3_enc->cert_verify_mac(s,
1096 &(s->s3->finish_dgst1),&(data[0]));
1097 if (RSA_sign(NID_md5_sha1, data,
1098 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1099 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1101 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1109 #ifndef OPENSSL_NO_DSA
1110 if (pkey->type == EVP_PKEY_DSA)
1112 if (!DSA_sign(pkey->save_type,
1113 &(data[MD5_DIGEST_LENGTH]),
1114 SHA_DIGEST_LENGTH,&(p[2]),
1115 (unsigned int *)&j,pkey->pkey.dsa))
1117 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1126 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1130 d = dtls1_set_message_header(s, d,
1131 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1133 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1136 /* buffer the message to handle re-xmits */
1137 dtls1_buffer_message(s, 0);
1139 s->state = SSL3_ST_CW_CERT_VRFY_B;
1142 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1143 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1148 int dtls1_send_client_certificate(SSL *s)
1151 EVP_PKEY *pkey=NULL;
1155 if (s->state == SSL3_ST_CW_CERT_A)
1157 if ((s->cert == NULL) ||
1158 (s->cert->key->x509 == NULL) ||
1159 (s->cert->key->privatekey == NULL))
1160 s->state=SSL3_ST_CW_CERT_B;
1162 s->state=SSL3_ST_CW_CERT_C;
1165 /* We need to get a client cert */
1166 if (s->state == SSL3_ST_CW_CERT_B)
1168 /* If we get an error, we need to
1169 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1170 * We then get retied later */
1172 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1175 s->rwstate=SSL_X509_LOOKUP;
1178 s->rwstate=SSL_NOTHING;
1179 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1181 s->state=SSL3_ST_CW_CERT_B;
1182 if ( !SSL_use_certificate(s,x509) ||
1183 !SSL_use_PrivateKey(s,pkey))
1189 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1192 if (x509 != NULL) X509_free(x509);
1193 if (pkey != NULL) EVP_PKEY_free(pkey);
1196 if (s->version == SSL3_VERSION)
1198 s->s3->tmp.cert_req=0;
1199 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1204 s->s3->tmp.cert_req=2;
1208 /* Ok, we have a cert */
1209 s->state=SSL3_ST_CW_CERT_C;
1212 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 == 2)?NULL:s->cert->key->x509);
1220 /* set header called by dtls1_output_cert_chain() */
1222 /* buffer the message to handle re-xmits */
1223 dtls1_buffer_message(s, 0);
1225 /* SSL3_ST_CW_CERT_D */
1226 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));