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);
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 /* EAY EAY EAY need to check for DH fix cert
379 /* For TLS, cert_req is set to 2, so a cert chain
380 * of nothing is sent, but no verify packet is sent */
381 if (s->s3->tmp.cert_req == 1)
383 s->state=SSL3_ST_CW_CERT_VRFY_A;
387 s->state=SSL3_ST_CW_CHANGE_A;
388 s->s3->change_cipher_spec=0;
394 case SSL3_ST_CW_CERT_VRFY_A:
395 case SSL3_ST_CW_CERT_VRFY_B:
396 dtls1_start_timer(s);
397 ret=dtls1_send_client_verify(s);
398 if (ret <= 0) goto end;
399 s->state=SSL3_ST_CW_CHANGE_A;
401 s->s3->change_cipher_spec=0;
404 case SSL3_ST_CW_CHANGE_A:
405 case SSL3_ST_CW_CHANGE_B:
406 dtls1_start_timer(s);
407 ret=dtls1_send_change_cipher_spec(s,
408 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
409 if (ret <= 0) goto end;
410 s->state=SSL3_ST_CW_FINISHED_A;
413 s->session->cipher=s->s3->tmp.new_cipher;
414 #ifdef OPENSSL_NO_COMP
415 s->session->compress_meth=0;
417 if (s->s3->tmp.new_compression == NULL)
418 s->session->compress_meth=0;
420 s->session->compress_meth=
421 s->s3->tmp.new_compression->id;
423 if (!s->method->ssl3_enc->setup_key_block(s))
429 if (!s->method->ssl3_enc->change_cipher_state(s,
430 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
436 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
439 case SSL3_ST_CW_FINISHED_A:
440 case SSL3_ST_CW_FINISHED_B:
441 dtls1_start_timer(s);
442 ret=dtls1_send_finished(s,
443 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
444 s->method->ssl3_enc->client_finished_label,
445 s->method->ssl3_enc->client_finished_label_len);
446 if (ret <= 0) goto end;
447 s->state=SSL3_ST_CW_FLUSH;
450 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
453 s->s3->tmp.next_state=SSL_ST_OK;
454 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
457 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
458 s->s3->delay_buf_pop_ret=0;
463 #ifndef OPENSSL_NO_TLSEXT
464 /* Allow NewSessionTicket if ticket expected */
465 if (s->tlsext_ticket_expected)
466 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
470 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
476 #ifndef OPENSSL_NO_TLSEXT
477 case SSL3_ST_CR_SESSION_TICKET_A:
478 case SSL3_ST_CR_SESSION_TICKET_B:
479 ret=ssl3_get_new_session_ticket(s);
480 if (ret <= 0) goto end;
481 s->state=SSL3_ST_CR_FINISHED_A;
485 case SSL3_ST_CR_CERT_STATUS_A:
486 case SSL3_ST_CR_CERT_STATUS_B:
487 ret=ssl3_get_cert_status(s);
488 if (ret <= 0) goto end;
489 s->state=SSL3_ST_CR_KEY_EXCH_A;
494 case SSL3_ST_CR_FINISHED_A:
495 case SSL3_ST_CR_FINISHED_B:
496 s->d1->change_cipher_spec_ok = 1;
497 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
498 SSL3_ST_CR_FINISHED_B);
499 if (ret <= 0) goto end;
503 s->state=SSL3_ST_CW_CHANGE_A;
509 case SSL3_ST_CW_FLUSH:
510 s->rwstate=SSL_WRITING;
511 if (BIO_flush(s->wbio) <= 0)
516 s->rwstate=SSL_NOTHING;
517 s->state=s->s3->tmp.next_state;
521 /* clean a few things up */
522 ssl3_cleanup_key_block(s);
525 if (s->init_buf != NULL)
527 BUF_MEM_free(s->init_buf);
532 /* If we are not 'joining' the last two packets,
533 * remove the buffering now */
534 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
535 ssl_free_wbio_buffer(s);
536 /* else do it later in ssl3_write */
541 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
542 if (s->hit) s->ctx->stats.sess_hit++;
546 s->handshake_func=dtls1_connect;
547 s->ctx->stats.sess_connect_good++;
549 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
551 /* done with handshaking */
552 s->d1->handshake_read_seq = 0;
553 s->d1->next_handshake_write_seq = 0;
558 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
564 /* did we do anything */
565 if (!s->s3->tmp.reuse_message && !skip)
569 if ((ret=BIO_flush(s->wbio)) <= 0)
573 if ((cb != NULL) && (s->state != state))
577 cb(s,SSL_CB_CONNECT_LOOP,1);
588 cb(s,SSL_CB_CONNECT_EXIT,ret);
592 int dtls1_client_hello(SSL *s)
597 unsigned long Time,l;
600 buf=(unsigned char *)s->init_buf->data;
601 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
603 SSL_SESSION *sess = s->session;
604 if ((s->session == NULL) ||
605 (s->session->ssl_version != s->version) ||
606 #ifdef OPENSSL_NO_TLSEXT
607 !sess->session_id_length ||
609 (!sess->session_id_length && !sess->tlsext_tick) ||
611 (s->session->not_resumable))
613 if (!ssl_get_new_session(s,0))
616 /* else use the pre-loaded session */
618 p=s->s3->client_random;
619 /* if client_random is initialized, reuse it, we are
620 * required to use same upon reply to HelloVerify */
621 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
622 if (i==sizeof(s->s3->client_random))
624 Time=(unsigned long)time(NULL); /* Time */
626 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
629 /* Do the message type and length last */
630 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
632 *(p++)=s->version>>8;
633 *(p++)=s->version&0xff;
634 s->client_version=s->version;
637 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
644 i=s->session->session_id_length;
648 if (i > sizeof s->session->session_id)
650 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
653 memcpy(p,s->session->session_id,i);
658 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
660 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
663 *(p++) = s->d1->cookie_len;
664 memcpy(p, s->d1->cookie, s->d1->cookie_len);
665 p += s->d1->cookie_len;
667 /* Ciphers supported */
668 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
671 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
678 if (s->ctx->comp_methods == NULL)
681 j=sk_SSL_COMP_num(s->ctx->comp_methods);
685 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
688 *(p++)=0; /* Add the NULL method */
690 #ifndef OPENSSL_NO_TLSEXT
691 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
693 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
701 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
703 s->state=SSL3_ST_CW_CLNT_HELLO_B;
704 /* number of bytes to write */
708 /* buffer the message to handle re-xmits */
709 dtls1_buffer_message(s, 0);
712 /* SSL3_ST_CW_CLNT_HELLO_B */
713 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
718 static int dtls1_get_hello_verify(SSL *s)
722 unsigned int cookie_len;
724 n=s->method->ssl_get_message(s,
725 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
726 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
731 if (!ok) return((int)n);
733 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
735 s->d1->send_cookie = 0;
736 s->s3->tmp.reuse_message=1;
740 data = (unsigned char *)s->init_msg;
742 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
744 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
745 s->version=(s->version&0xff00)|data[1];
746 al = SSL_AD_PROTOCOL_VERSION;
751 cookie_len = *(data++);
752 if ( cookie_len > sizeof(s->d1->cookie))
754 al=SSL_AD_ILLEGAL_PARAMETER;
758 memcpy(s->d1->cookie, data, cookie_len);
759 s->d1->cookie_len = cookie_len;
761 s->d1->send_cookie = 1;
765 ssl3_send_alert(s, SSL3_AL_FATAL, al);
769 int dtls1_send_client_key_exchange(SSL *s)
774 #ifndef OPENSSL_NO_RSA
778 #ifndef OPENSSL_NO_KRB5
780 #endif /* OPENSSL_NO_KRB5 */
782 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 */
791 #ifndef OPENSSL_NO_RSA
792 else if (l & SSL_kRSA)
795 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
797 if (s->session->sess_cert->peer_rsa_tmp != NULL)
798 rsa=s->session->sess_cert->peer_rsa_tmp;
801 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
802 if ((pkey == NULL) ||
803 (pkey->type != EVP_PKEY_RSA) ||
804 (pkey->pkey.rsa == NULL))
806 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
813 tmp_buf[0]=s->client_version>>8;
814 tmp_buf[1]=s->client_version&0xff;
815 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
818 s->session->master_key_length=sizeof tmp_buf;
821 /* Fix buf for TLS and [incidentally] DTLS */
822 if (s->version > SSL3_VERSION)
824 n=RSA_public_encrypt(sizeof tmp_buf,
825 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
827 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
828 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
832 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
836 /* Fix buf for TLS and [incidentally] DTLS */
837 if (s->version > SSL3_VERSION)
843 s->session->master_key_length=
844 s->method->ssl3_enc->generate_master_secret(s,
845 s->session->master_key,
846 tmp_buf,sizeof tmp_buf);
847 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
850 #ifndef OPENSSL_NO_KRB5
851 else if (l & SSL_kKRB5)
853 krb5_error_code krb5rc;
854 KSSL_CTX *kssl_ctx = s->kssl_ctx;
855 /* krb5_data krb5_ap_req; */
856 krb5_data *enc_ticket;
857 krb5_data authenticator, *authp = NULL;
858 EVP_CIPHER_CTX ciph_ctx;
859 EVP_CIPHER *enc = NULL;
860 unsigned char iv[EVP_MAX_IV_LENGTH];
861 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
862 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
863 + EVP_MAX_IV_LENGTH];
864 int padl, outl = sizeof(epms);
866 EVP_CIPHER_CTX_init(&ciph_ctx);
869 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
871 #endif /* KSSL_DEBUG */
875 if (KRB5SENDAUTH) authp = &authenticator;
876 #endif /* KRB5SENDAUTH */
878 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
880 enc = kssl_map_enc(kssl_ctx->enctype);
885 printf("kssl_cget_tkt rtn %d\n", krb5rc);
886 if (krb5rc && kssl_err.text)
887 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
889 #endif /* KSSL_DEBUG */
893 ssl3_send_alert(s,SSL3_AL_FATAL,
894 SSL_AD_HANDSHAKE_FAILURE);
895 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
900 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
901 ** in place of RFC 2712 KerberosWrapper, as in:
903 ** Send ticket (copy to *p, set n = length)
904 ** n = krb5_ap_req.length;
905 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
906 ** if (krb5_ap_req.data)
907 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
909 ** Now using real RFC 2712 KerberosWrapper
910 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
911 ** Note: 2712 "opaque" types are here replaced
912 ** with a 2-byte length followed by the value.
914 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
915 ** Where "xx xx" = length bytes. Shown here with
916 ** optional authenticator omitted.
919 /* KerberosWrapper.Ticket */
920 s2n(enc_ticket->length,p);
921 memcpy(p, enc_ticket->data, enc_ticket->length);
922 p+= enc_ticket->length;
923 n = enc_ticket->length + 2;
925 /* KerberosWrapper.Authenticator */
926 if (authp && authp->length)
928 s2n(authp->length,p);
929 memcpy(p, authp->data, authp->length);
931 n+= authp->length + 2;
939 s2n(0,p);/* null authenticator length */
943 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
946 /* 20010420 VRS. Tried it this way; failed.
947 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
948 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
949 ** kssl_ctx->length);
950 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
953 memset(iv, 0, sizeof iv); /* per RFC 1510 */
954 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
956 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
958 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
960 if (outl > sizeof epms)
962 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
965 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
967 /* KerberosWrapper.EncryptedPreMasterSecret */
969 memcpy(p, epms, outl);
973 s->session->master_key_length=
974 s->method->ssl3_enc->generate_master_secret(s,
975 s->session->master_key,
976 tmp_buf, sizeof tmp_buf);
978 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
979 OPENSSL_cleanse(epms, outl);
982 #ifndef OPENSSL_NO_DH
983 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
985 DH *dh_srvr,*dh_clnt;
987 if (s->session->sess_cert->peer_dh_tmp != NULL)
988 dh_srvr=s->session->sess_cert->peer_dh_tmp;
991 /* we get them from the cert */
992 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
993 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
997 /* generate a new random key */
998 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1000 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1003 if (!DH_generate_key(dh_clnt))
1005 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1009 /* use the 'p' output buffer for the DH key, but
1010 * make sure to clear it out afterwards */
1012 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1016 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1020 /* generate master key from the result */
1021 s->session->master_key_length=
1022 s->method->ssl3_enc->generate_master_secret(s,
1023 s->session->master_key,p,n);
1027 /* send off the data */
1028 n=BN_num_bytes(dh_clnt->pub_key);
1030 BN_bn2bin(dh_clnt->pub_key,p);
1035 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1040 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1041 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1045 d = dtls1_set_message_header(s, d,
1046 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1048 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1050 l2n(s->d1->handshake_write_seq,d);
1051 s->d1->handshake_write_seq++;
1054 s->state=SSL3_ST_CW_KEY_EXCH_B;
1055 /* number of bytes to write */
1056 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1059 /* buffer the message to handle re-xmits */
1060 dtls1_buffer_message(s, 0);
1063 /* SSL3_ST_CW_KEY_EXCH_B */
1064 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1069 int dtls1_send_client_verify(SSL *s)
1071 unsigned char *p,*d;
1072 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1074 #ifndef OPENSSL_NO_RSA
1078 #ifndef OPENSSL_NO_DSA
1082 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1084 d=(unsigned char *)s->init_buf->data;
1085 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1086 pkey=s->cert->key->privatekey;
1088 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1089 &(data[MD5_DIGEST_LENGTH]));
1091 #ifndef OPENSSL_NO_RSA
1092 if (pkey->type == EVP_PKEY_RSA)
1094 s->method->ssl3_enc->cert_verify_mac(s,
1095 &(s->s3->finish_dgst1),&(data[0]));
1096 if (RSA_sign(NID_md5_sha1, data,
1097 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1098 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1100 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1108 #ifndef OPENSSL_NO_DSA
1109 if (pkey->type == EVP_PKEY_DSA)
1111 if (!DSA_sign(pkey->save_type,
1112 &(data[MD5_DIGEST_LENGTH]),
1113 SHA_DIGEST_LENGTH,&(p[2]),
1114 (unsigned int *)&j,pkey->pkey.dsa))
1116 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1125 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1129 d = dtls1_set_message_header(s, d,
1130 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1132 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1135 /* buffer the message to handle re-xmits */
1136 dtls1_buffer_message(s, 0);
1138 s->state = SSL3_ST_CW_CERT_VRFY_B;
1141 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1142 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1147 int dtls1_send_client_certificate(SSL *s)
1150 EVP_PKEY *pkey=NULL;
1154 if (s->state == SSL3_ST_CW_CERT_A)
1156 if ((s->cert == NULL) ||
1157 (s->cert->key->x509 == NULL) ||
1158 (s->cert->key->privatekey == NULL))
1159 s->state=SSL3_ST_CW_CERT_B;
1161 s->state=SSL3_ST_CW_CERT_C;
1164 /* We need to get a client cert */
1165 if (s->state == SSL3_ST_CW_CERT_B)
1167 /* If we get an error, we need to
1168 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1169 * We then get retied later */
1171 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1174 s->rwstate=SSL_X509_LOOKUP;
1177 s->rwstate=SSL_NOTHING;
1178 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1180 s->state=SSL3_ST_CW_CERT_B;
1181 if ( !SSL_use_certificate(s,x509) ||
1182 !SSL_use_PrivateKey(s,pkey))
1188 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1191 if (x509 != NULL) X509_free(x509);
1192 if (pkey != NULL) EVP_PKEY_free(pkey);
1195 if (s->version == SSL3_VERSION)
1197 s->s3->tmp.cert_req=0;
1198 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1203 s->s3->tmp.cert_req=2;
1207 /* Ok, we have a cert */
1208 s->state=SSL3_ST_CW_CERT_C;
1211 if (s->state == SSL3_ST_CW_CERT_C)
1213 s->state=SSL3_ST_CW_CERT_D;
1214 l=dtls1_output_cert_chain(s,
1215 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1219 /* set header called by dtls1_output_cert_chain() */
1221 /* buffer the message to handle re-xmits */
1222 dtls1_buffer_message(s, 0);
1224 /* SSL3_ST_CW_CERT_D */
1225 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));