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/md5.h>
123 #include <openssl/bn.h>
124 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
128 static const SSL_METHOD *dtls1_get_client_method(int ver);
129 static int dtls1_get_hello_verify(SSL *s);
131 static const SSL_METHOD *dtls1_get_client_method(int ver)
133 if (ver == DTLS1_VERSION)
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);
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
151 int new_state,state,skip=0;;
153 RAND_add(&Time,sizeof(Time),0);
157 if (s->info_callback != NULL)
159 else if (s->ctx->info_callback != NULL)
160 cb=s->ctx->info_callback;
163 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
171 case SSL_ST_RENEGOTIATE:
173 s->state=SSL_ST_CONNECT;
174 s->ctx->stats.sess_connect_renegotiate++;
178 case SSL_ST_BEFORE|SSL_ST_CONNECT:
179 case SSL_ST_OK|SSL_ST_CONNECT:
182 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
184 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 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 ssl3_init_finished_mac(s);
219 s->state=SSL3_ST_CW_CLNT_HELLO_A;
220 s->ctx->stats.sess_connect++;
224 case SSL3_ST_CW_CLNT_HELLO_A:
225 case SSL3_ST_CW_CLNT_HELLO_B:
228 ret=dtls1_client_hello(s);
229 if (ret <= 0) goto end;
231 if ( s->d1->send_cookie)
233 s->state=SSL3_ST_CW_FLUSH;
234 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
237 s->state=SSL3_ST_CR_SRVR_HELLO_A;
241 /* turn on buffering for the next lot of output */
242 if (s->bbio != s->wbio)
243 s->wbio=BIO_push(s->bbio,s->wbio);
247 case SSL3_ST_CR_SRVR_HELLO_A:
248 case SSL3_ST_CR_SRVR_HELLO_B:
249 ret=ssl3_get_server_hello(s);
250 if (ret <= 0) goto end;
254 s->state=SSL3_ST_CR_FINISHED_A;
256 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
261 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
262 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
264 ret = dtls1_get_hello_verify(s);
267 if ( s->d1->send_cookie) /* start again, with a cookie */
268 s->state=SSL3_ST_CW_CLNT_HELLO_A;
270 s->state = SSL3_ST_CR_CERT_A;
274 case SSL3_ST_CR_CERT_A:
275 case SSL3_ST_CR_CERT_B:
276 /* Check if it is anon DH */
277 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
279 ret=ssl3_get_server_certificate(s);
280 if (ret <= 0) goto end;
284 s->state=SSL3_ST_CR_KEY_EXCH_A;
288 case SSL3_ST_CR_KEY_EXCH_A:
289 case SSL3_ST_CR_KEY_EXCH_B:
290 ret=ssl3_get_key_exchange(s);
291 if (ret <= 0) goto end;
292 s->state=SSL3_ST_CR_CERT_REQ_A;
295 /* at this point we check that we have the
296 * required stuff from the server */
297 if (!ssl3_check_cert_and_algorithm(s))
304 case SSL3_ST_CR_CERT_REQ_A:
305 case SSL3_ST_CR_CERT_REQ_B:
306 ret=ssl3_get_certificate_request(s);
307 if (ret <= 0) goto end;
308 s->state=SSL3_ST_CR_SRVR_DONE_A;
312 case SSL3_ST_CR_SRVR_DONE_A:
313 case SSL3_ST_CR_SRVR_DONE_B:
314 ret=ssl3_get_server_done(s);
315 if (ret <= 0) goto end;
316 if (s->s3->tmp.cert_req)
317 s->state=SSL3_ST_CW_CERT_A;
319 s->state=SSL3_ST_CW_KEY_EXCH_A;
324 case SSL3_ST_CW_CERT_A:
325 case SSL3_ST_CW_CERT_B:
326 case SSL3_ST_CW_CERT_C:
327 case SSL3_ST_CW_CERT_D:
328 ret=dtls1_send_client_certificate(s);
329 if (ret <= 0) goto end;
330 s->state=SSL3_ST_CW_KEY_EXCH_A;
334 case SSL3_ST_CW_KEY_EXCH_A:
335 case SSL3_ST_CW_KEY_EXCH_B:
336 ret=dtls1_send_client_key_exchange(s);
337 if (ret <= 0) goto end;
338 /* EAY EAY EAY need to check for DH fix cert
340 /* For TLS, cert_req is set to 2, so a cert chain
341 * of nothing is sent, but no verify packet is sent */
342 if (s->s3->tmp.cert_req == 1)
344 s->state=SSL3_ST_CW_CERT_VRFY_A;
348 s->state=SSL3_ST_CW_CHANGE_A;
349 s->s3->change_cipher_spec=0;
355 case SSL3_ST_CW_CERT_VRFY_A:
356 case SSL3_ST_CW_CERT_VRFY_B:
357 ret=dtls1_send_client_verify(s);
358 if (ret <= 0) goto end;
359 s->state=SSL3_ST_CW_CHANGE_A;
361 s->s3->change_cipher_spec=0;
364 case SSL3_ST_CW_CHANGE_A:
365 case SSL3_ST_CW_CHANGE_B:
366 ret=dtls1_send_change_cipher_spec(s,
367 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
368 if (ret <= 0) goto end;
369 s->state=SSL3_ST_CW_FINISHED_A;
372 s->session->cipher=s->s3->tmp.new_cipher;
373 #ifdef OPENSSL_NO_COMP
374 s->session->compress_meth=0;
376 if (s->s3->tmp.new_compression == NULL)
377 s->session->compress_meth=0;
379 s->session->compress_meth=
380 s->s3->tmp.new_compression->id;
382 if (!s->method->ssl3_enc->setup_key_block(s))
388 if (!s->method->ssl3_enc->change_cipher_state(s,
389 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
395 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
398 case SSL3_ST_CW_FINISHED_A:
399 case SSL3_ST_CW_FINISHED_B:
400 ret=dtls1_send_finished(s,
401 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
402 s->method->ssl3_enc->client_finished_label,
403 s->method->ssl3_enc->client_finished_label_len);
404 if (ret <= 0) goto end;
405 s->state=SSL3_ST_CW_FLUSH;
408 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
411 s->s3->tmp.next_state=SSL_ST_OK;
412 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
415 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
416 s->s3->delay_buf_pop_ret=0;
421 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
426 case SSL3_ST_CR_FINISHED_A:
427 case SSL3_ST_CR_FINISHED_B:
429 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
430 SSL3_ST_CR_FINISHED_B);
431 if (ret <= 0) goto end;
434 s->state=SSL3_ST_CW_CHANGE_A;
440 case SSL3_ST_CW_FLUSH:
441 /* number of bytes to be flushed */
442 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
445 s->rwstate=SSL_WRITING;
446 num1=BIO_flush(s->wbio);
447 if (num1 <= 0) { ret= -1; goto end; }
448 s->rwstate=SSL_NOTHING;
451 s->state=s->s3->tmp.next_state;
455 /* clean a few things up */
456 ssl3_cleanup_key_block(s);
459 if (s->init_buf != NULL)
461 BUF_MEM_free(s->init_buf);
466 /* If we are not 'joining' the last two packets,
467 * remove the buffering now */
468 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
469 ssl_free_wbio_buffer(s);
470 /* else do it later in ssl3_write */
475 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
476 if (s->hit) s->ctx->stats.sess_hit++;
480 s->handshake_func=dtls1_connect;
481 s->ctx->stats.sess_connect_good++;
483 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
485 /* done with handshaking */
486 s->d1->handshake_read_seq = 0;
491 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
497 /* did we do anything */
498 if (!s->s3->tmp.reuse_message && !skip)
502 if ((ret=BIO_flush(s->wbio)) <= 0)
506 if ((cb != NULL) && (s->state != state))
510 cb(s,SSL_CB_CONNECT_LOOP,1);
521 cb(s,SSL_CB_CONNECT_EXIT,ret);
525 int dtls1_client_hello(SSL *s)
530 unsigned long Time,l;
533 buf=(unsigned char *)s->init_buf->data;
534 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
536 if ((s->session == NULL) ||
537 (s->session->ssl_version != s->version) ||
538 (s->session->not_resumable))
540 if (!ssl_get_new_session(s,0))
543 /* else use the pre-loaded session */
545 p=s->s3->client_random;
546 Time=(unsigned long)time(NULL); /* Time */
548 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
550 /* Do the message type and length last */
551 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
553 *(p++)=s->version>>8;
554 *(p++)=s->version&0xff;
555 s->client_version=s->version;
558 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
565 i=s->session->session_id_length;
569 if (i > sizeof s->session->session_id)
571 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
574 memcpy(p,s->session->session_id,i);
579 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
581 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
584 *(p++) = s->d1->cookie_len;
585 memcpy(p, s->d1->cookie, s->d1->cookie_len);
586 p += s->d1->cookie_len;
588 /* Ciphers supported */
589 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
592 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
599 if (s->ctx->comp_methods == NULL)
602 j=sk_SSL_COMP_num(s->ctx->comp_methods);
606 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
609 *(p++)=0; /* Add the NULL method */
614 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
616 s->state=SSL3_ST_CW_CLNT_HELLO_B;
617 /* number of bytes to write */
621 /* buffer the message to handle re-xmits */
622 dtls1_buffer_message(s, 0);
625 /* SSL3_ST_CW_CLNT_HELLO_B */
626 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
631 static int dtls1_get_hello_verify(SSL *s)
635 unsigned int cookie_len;
637 n=s->method->ssl_get_message(s,
638 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
639 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
644 if (!ok) return((int)n);
646 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
648 s->d1->send_cookie = 0;
649 s->s3->tmp.reuse_message=1;
653 data = (unsigned char *)s->init_msg;
655 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
657 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
658 s->version=(s->version&0xff00)|data[1];
659 al = SSL_AD_PROTOCOL_VERSION;
664 cookie_len = *(data++);
665 if ( cookie_len > sizeof(s->d1->cookie))
667 al=SSL_AD_ILLEGAL_PARAMETER;
671 memcpy(s->d1->cookie, data, cookie_len);
672 s->d1->cookie_len = cookie_len;
674 s->d1->send_cookie = 1;
678 ssl3_send_alert(s, SSL3_AL_FATAL, al);
682 int dtls1_send_client_key_exchange(SSL *s)
687 #ifndef OPENSSL_NO_RSA
691 #ifndef OPENSSL_NO_KRB5
693 #endif /* OPENSSL_NO_KRB5 */
695 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
697 d=(unsigned char *)s->init_buf->data;
698 p= &(d[DTLS1_HM_HEADER_LENGTH]);
700 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
702 /* Fool emacs indentation */
704 #ifndef OPENSSL_NO_RSA
705 else if (alg_k & SSL_kRSA)
708 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
710 if (s->session->sess_cert->peer_rsa_tmp != NULL)
711 rsa=s->session->sess_cert->peer_rsa_tmp;
714 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
715 if ((pkey == NULL) ||
716 (pkey->type != EVP_PKEY_RSA) ||
717 (pkey->pkey.rsa == NULL))
719 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
726 tmp_buf[0]=s->client_version>>8;
727 tmp_buf[1]=s->client_version&0xff;
728 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
731 s->session->master_key_length=sizeof tmp_buf;
734 /* Fix buf for TLS and beyond */
735 if (s->version > SSL3_VERSION)
737 n=RSA_public_encrypt(sizeof tmp_buf,
738 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
740 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
741 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
745 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
749 /* Fix buf for TLS and beyond */
750 if (s->version > SSL3_VERSION)
756 s->session->master_key_length=
757 s->method->ssl3_enc->generate_master_secret(s,
758 s->session->master_key,
759 tmp_buf,sizeof tmp_buf);
760 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
763 #ifndef OPENSSL_NO_KRB5
764 else if (alg_k & SSL_kKRB5)
766 krb5_error_code krb5rc;
767 KSSL_CTX *kssl_ctx = s->kssl_ctx;
768 /* krb5_data krb5_ap_req; */
769 krb5_data *enc_ticket;
770 krb5_data authenticator, *authp = NULL;
771 EVP_CIPHER_CTX ciph_ctx;
772 EVP_CIPHER *enc = NULL;
773 unsigned char iv[EVP_MAX_IV_LENGTH];
774 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
775 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
776 + EVP_MAX_IV_LENGTH];
777 int padl, outl = sizeof(epms);
779 EVP_CIPHER_CTX_init(&ciph_ctx);
782 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
784 #endif /* KSSL_DEBUG */
788 if (KRB5SENDAUTH) authp = &authenticator;
789 #endif /* KRB5SENDAUTH */
791 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
793 enc = kssl_map_enc(kssl_ctx->enctype);
798 printf("kssl_cget_tkt rtn %d\n", krb5rc);
799 if (krb5rc && kssl_err.text)
800 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
802 #endif /* KSSL_DEBUG */
806 ssl3_send_alert(s,SSL3_AL_FATAL,
807 SSL_AD_HANDSHAKE_FAILURE);
808 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
813 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
814 ** in place of RFC 2712 KerberosWrapper, as in:
816 ** Send ticket (copy to *p, set n = length)
817 ** n = krb5_ap_req.length;
818 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
819 ** if (krb5_ap_req.data)
820 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
822 ** Now using real RFC 2712 KerberosWrapper
823 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
824 ** Note: 2712 "opaque" types are here replaced
825 ** with a 2-byte length followed by the value.
827 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
828 ** Where "xx xx" = length bytes. Shown here with
829 ** optional authenticator omitted.
832 /* KerberosWrapper.Ticket */
833 s2n(enc_ticket->length,p);
834 memcpy(p, enc_ticket->data, enc_ticket->length);
835 p+= enc_ticket->length;
836 n = enc_ticket->length + 2;
838 /* KerberosWrapper.Authenticator */
839 if (authp && authp->length)
841 s2n(authp->length,p);
842 memcpy(p, authp->data, authp->length);
844 n+= authp->length + 2;
852 s2n(0,p);/* null authenticator length */
856 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
859 /* 20010420 VRS. Tried it this way; failed.
860 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
861 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
862 ** kssl_ctx->length);
863 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
866 memset(iv, 0, sizeof iv); /* per RFC 1510 */
867 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
869 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
871 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
873 if (outl > sizeof epms)
875 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
878 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
880 /* KerberosWrapper.EncryptedPreMasterSecret */
882 memcpy(p, epms, outl);
886 s->session->master_key_length=
887 s->method->ssl3_enc->generate_master_secret(s,
888 s->session->master_key,
889 tmp_buf, sizeof tmp_buf);
891 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
892 OPENSSL_cleanse(epms, outl);
895 #ifndef OPENSSL_NO_DH
896 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
898 DH *dh_srvr,*dh_clnt;
900 if (s->session->sess_cert->peer_dh_tmp != NULL)
901 dh_srvr=s->session->sess_cert->peer_dh_tmp;
904 /* we get them from the cert */
905 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
906 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
910 /* generate a new random key */
911 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
913 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
916 if (!DH_generate_key(dh_clnt))
918 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
922 /* use the 'p' output buffer for the DH key, but
923 * make sure to clear it out afterwards */
925 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
929 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
933 /* generate master key from the result */
934 s->session->master_key_length=
935 s->method->ssl3_enc->generate_master_secret(s,
936 s->session->master_key,p,n);
940 /* send off the data */
941 n=BN_num_bytes(dh_clnt->pub_key);
943 BN_bn2bin(dh_clnt->pub_key,p);
948 /* perhaps clean things up a bit EAY EAY EAY EAY*/
953 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
954 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
958 d = dtls1_set_message_header(s, d,
959 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
961 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
963 l2n(s->d1->handshake_write_seq,d);
964 s->d1->handshake_write_seq++;
967 s->state=SSL3_ST_CW_KEY_EXCH_B;
968 /* number of bytes to write */
969 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
972 /* buffer the message to handle re-xmits */
973 dtls1_buffer_message(s, 0);
976 /* SSL3_ST_CW_KEY_EXCH_B */
977 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
982 int dtls1_send_client_verify(SSL *s)
985 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
987 #ifndef OPENSSL_NO_RSA
991 #ifndef OPENSSL_NO_DSA
995 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
997 d=(unsigned char *)s->init_buf->data;
998 p= &(d[DTLS1_HM_HEADER_LENGTH]);
999 pkey=s->cert->key->privatekey;
1001 s->method->ssl3_enc->cert_verify_mac(s,
1003 &(data[MD5_DIGEST_LENGTH]));
1005 #ifndef OPENSSL_NO_RSA
1006 if (pkey->type == EVP_PKEY_RSA)
1008 s->method->ssl3_enc->cert_verify_mac(s,
1011 if (RSA_sign(NID_md5_sha1, data,
1012 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1013 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1015 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1023 #ifndef OPENSSL_NO_DSA
1024 if (pkey->type == EVP_PKEY_DSA)
1026 if (!DSA_sign(pkey->save_type,
1027 &(data[MD5_DIGEST_LENGTH]),
1028 SHA_DIGEST_LENGTH,&(p[2]),
1029 (unsigned int *)&j,pkey->pkey.dsa))
1031 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1040 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1044 d = dtls1_set_message_header(s, d,
1045 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1047 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1050 /* buffer the message to handle re-xmits */
1051 dtls1_buffer_message(s, 0);
1053 s->state = SSL3_ST_CW_CERT_VRFY_B;
1056 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1057 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1062 int dtls1_send_client_certificate(SSL *s)
1065 EVP_PKEY *pkey=NULL;
1069 if (s->state == SSL3_ST_CW_CERT_A)
1071 if ((s->cert == NULL) ||
1072 (s->cert->key->x509 == NULL) ||
1073 (s->cert->key->privatekey == NULL))
1074 s->state=SSL3_ST_CW_CERT_B;
1076 s->state=SSL3_ST_CW_CERT_C;
1079 /* We need to get a client cert */
1080 if (s->state == SSL3_ST_CW_CERT_B)
1082 /* If we get an error, we need to
1083 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1084 * We then get retied later */
1086 if (s->ctx->client_cert_cb != NULL)
1087 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1090 s->rwstate=SSL_X509_LOOKUP;
1093 s->rwstate=SSL_NOTHING;
1094 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1096 s->state=SSL3_ST_CW_CERT_B;
1097 if ( !SSL_use_certificate(s,x509) ||
1098 !SSL_use_PrivateKey(s,pkey))
1104 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1107 if (x509 != NULL) X509_free(x509);
1108 if (pkey != NULL) EVP_PKEY_free(pkey);
1111 if (s->version == SSL3_VERSION)
1113 s->s3->tmp.cert_req=0;
1114 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1119 s->s3->tmp.cert_req=2;
1123 /* Ok, we have a cert */
1124 s->state=SSL3_ST_CW_CERT_C;
1127 if (s->state == SSL3_ST_CW_CERT_C)
1129 s->state=SSL3_ST_CW_CERT_D;
1130 l=dtls1_output_cert_chain(s,
1131 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1135 /* set header called by dtls1_output_cert_chain() */
1137 /* buffer the message to handle re-xmits */
1138 dtls1_buffer_message(s, 0);
1140 /* SSL3_ST_CW_CERT_D */
1141 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));