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 #ifndef OPENSSL_NO_KRB5
119 #include "kssl_lcl.h"
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/bn.h>
127 #ifndef OPENSSL_NO_DH
128 #include <openssl/dh.h>
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
134 static const SSL_METHOD *dtls1_get_client_method(int ver)
136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137 return(DTLSv1_client_method());
142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143 ssl_undefined_function,
145 dtls1_get_client_method)
147 int dtls1_connect(SSL *s)
150 unsigned long Time=(unsigned long)time(NULL);
152 void (*cb)(const SSL *ssl,int type,int val)=NULL;
154 int new_state,state,skip=0;;
156 RAND_add(&Time,sizeof(Time),0);
160 if (s->info_callback != NULL)
162 else if (s->ctx->info_callback != NULL)
163 cb=s->ctx->info_callback;
166 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
174 case SSL_ST_RENEGOTIATE:
176 s->state=SSL_ST_CONNECT;
177 s->ctx->stats.sess_connect_renegotiate++;
181 case SSL_ST_BEFORE|SSL_ST_CONNECT:
182 case SSL_ST_OK|SSL_ST_CONNECT:
185 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
187 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
188 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
190 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
195 /* s->version=SSL3_VERSION; */
196 s->type=SSL_ST_CONNECT;
198 if (s->init_buf == NULL)
200 if ((buf=BUF_MEM_new()) == NULL)
205 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
214 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
216 /* setup buffing BIO */
217 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
219 /* don't push the buffering BIO quite yet */
221 s->state=SSL3_ST_CW_CLNT_HELLO_A;
222 s->ctx->stats.sess_connect++;
224 /* mark client_random uninitialized */
225 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
228 case SSL3_ST_CW_CLNT_HELLO_A:
229 case SSL3_ST_CW_CLNT_HELLO_B:
233 /* every DTLS ClientHello resets Finished MAC */
234 ssl3_init_finished_mac(s);
236 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
237 ret=dtls1_client_hello(s);
238 if (ret <= 0) goto end;
240 if ( s->d1->send_cookie)
242 s->state=SSL3_ST_CW_FLUSH;
243 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
246 s->state=SSL3_ST_CR_SRVR_HELLO_A;
250 /* turn on buffering for the next lot of output */
251 if (s->bbio != s->wbio)
252 s->wbio=BIO_push(s->bbio,s->wbio);
256 case SSL3_ST_CR_SRVR_HELLO_A:
257 case SSL3_ST_CR_SRVR_HELLO_B:
258 ret=ssl3_get_server_hello(s);
259 if (ret <= 0) goto end;
262 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
264 s->state=SSL3_ST_CR_FINISHED_A;
266 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
271 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
272 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
274 ret = dtls1_get_hello_verify(s);
277 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
278 if ( s->d1->send_cookie) /* start again, with a cookie */
279 s->state=SSL3_ST_CW_CLNT_HELLO_A;
281 s->state = SSL3_ST_CR_CERT_A;
285 case SSL3_ST_CR_CERT_A:
286 case SSL3_ST_CR_CERT_B:
287 /* Check if it is anon DH */
288 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
290 ret=ssl3_get_server_certificate(s);
291 if (ret <= 0) goto end;
295 s->state=SSL3_ST_CR_KEY_EXCH_A;
299 case SSL3_ST_CR_KEY_EXCH_A:
300 case SSL3_ST_CR_KEY_EXCH_B:
301 ret=ssl3_get_key_exchange(s);
302 if (ret <= 0) goto end;
303 s->state=SSL3_ST_CR_CERT_REQ_A;
306 /* at this point we check that we have the
307 * required stuff from the server */
308 if (!ssl3_check_cert_and_algorithm(s))
315 case SSL3_ST_CR_CERT_REQ_A:
316 case SSL3_ST_CR_CERT_REQ_B:
317 ret=ssl3_get_certificate_request(s);
318 if (ret <= 0) goto end;
319 s->state=SSL3_ST_CR_SRVR_DONE_A;
323 case SSL3_ST_CR_SRVR_DONE_A:
324 case SSL3_ST_CR_SRVR_DONE_B:
325 ret=ssl3_get_server_done(s);
326 if (ret <= 0) goto end;
327 if (s->s3->tmp.cert_req)
328 s->state=SSL3_ST_CW_CERT_A;
330 s->state=SSL3_ST_CW_KEY_EXCH_A;
335 case SSL3_ST_CW_CERT_A:
336 case SSL3_ST_CW_CERT_B:
337 case SSL3_ST_CW_CERT_C:
338 case SSL3_ST_CW_CERT_D:
339 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
340 ret=dtls1_send_client_certificate(s);
341 if (ret <= 0) goto end;
342 s->state=SSL3_ST_CW_KEY_EXCH_A;
346 case SSL3_ST_CW_KEY_EXCH_A:
347 case SSL3_ST_CW_KEY_EXCH_B:
348 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
349 ret=dtls1_send_client_key_exchange(s);
350 if (ret <= 0) goto end;
351 /* EAY EAY EAY need to check for DH fix cert
353 /* For TLS, cert_req is set to 2, so a cert chain
354 * of nothing is sent, but no verify packet is sent */
355 if (s->s3->tmp.cert_req == 1)
357 s->state=SSL3_ST_CW_CERT_VRFY_A;
361 s->state=SSL3_ST_CW_CHANGE_A;
362 s->s3->change_cipher_spec=0;
368 case SSL3_ST_CW_CERT_VRFY_A:
369 case SSL3_ST_CW_CERT_VRFY_B:
370 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
371 ret=dtls1_send_client_verify(s);
372 if (ret <= 0) goto end;
373 s->state=SSL3_ST_CW_CHANGE_A;
375 s->s3->change_cipher_spec=0;
378 case SSL3_ST_CW_CHANGE_A:
379 case SSL3_ST_CW_CHANGE_B:
380 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
381 ret=dtls1_send_change_cipher_spec(s,
382 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
383 if (ret <= 0) goto end;
384 s->state=SSL3_ST_CW_FINISHED_A;
387 s->session->cipher=s->s3->tmp.new_cipher;
388 #ifdef OPENSSL_NO_COMP
389 s->session->compress_meth=0;
391 if (s->s3->tmp.new_compression == NULL)
392 s->session->compress_meth=0;
394 s->session->compress_meth=
395 s->s3->tmp.new_compression->id;
397 if (!s->method->ssl3_enc->setup_key_block(s))
403 if (!s->method->ssl3_enc->change_cipher_state(s,
404 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
410 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
413 case SSL3_ST_CW_FINISHED_A:
414 case SSL3_ST_CW_FINISHED_B:
415 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
416 ret=dtls1_send_finished(s,
417 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
418 s->method->ssl3_enc->client_finished_label,
419 s->method->ssl3_enc->client_finished_label_len);
420 if (ret <= 0) goto end;
421 s->state=SSL3_ST_CW_FLUSH;
424 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
427 s->s3->tmp.next_state=SSL_ST_OK;
428 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
431 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
432 s->s3->delay_buf_pop_ret=0;
437 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
442 case SSL3_ST_CR_FINISHED_A:
443 case SSL3_ST_CR_FINISHED_B:
445 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
446 SSL3_ST_CR_FINISHED_B);
447 if (ret <= 0) goto end;
448 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
451 s->state=SSL3_ST_CW_CHANGE_A;
457 case SSL3_ST_CW_FLUSH:
458 /* number of bytes to be flushed */
459 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
462 s->rwstate=SSL_WRITING;
463 num1=BIO_flush(s->wbio);
464 if (num1 <= 0) { ret= -1; goto end; }
465 s->rwstate=SSL_NOTHING;
468 s->state=s->s3->tmp.next_state;
472 /* clean a few things up */
473 ssl3_cleanup_key_block(s);
476 if (s->init_buf != NULL)
478 BUF_MEM_free(s->init_buf);
483 /* If we are not 'joining' the last two packets,
484 * remove the buffering now */
485 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
486 ssl_free_wbio_buffer(s);
487 /* else do it later in ssl3_write */
492 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
493 if (s->hit) s->ctx->stats.sess_hit++;
497 s->handshake_func=dtls1_connect;
498 s->ctx->stats.sess_connect_good++;
500 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
502 /* done with handshaking */
503 s->d1->handshake_read_seq = 0;
504 s->d1->next_handshake_write_seq = 0;
509 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
515 /* did we do anything */
516 if (!s->s3->tmp.reuse_message && !skip)
520 if ((ret=BIO_flush(s->wbio)) <= 0)
524 if ((cb != NULL) && (s->state != state))
528 cb(s,SSL_CB_CONNECT_LOOP,1);
539 cb(s,SSL_CB_CONNECT_EXIT,ret);
543 int dtls1_client_hello(SSL *s)
548 unsigned long Time,l;
551 buf=(unsigned char *)s->init_buf->data;
552 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
554 if ((s->session == NULL) ||
555 (s->session->ssl_version != s->version) ||
556 (s->session->not_resumable))
558 if (!ssl_get_new_session(s,0))
561 /* else use the pre-loaded session */
563 p=s->s3->client_random;
565 /* if client_random is initialized, reuse it, we are
566 * required to use same upon reply to HelloVerify */
567 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
568 if (i==sizeof(s->s3->client_random))
570 Time=(unsigned long)time(NULL); /* Time */
572 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
575 /* Do the message type and length last */
576 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
578 *(p++)=s->version>>8;
579 *(p++)=s->version&0xff;
580 s->client_version=s->version;
583 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
590 i=s->session->session_id_length;
594 if (i > sizeof s->session->session_id)
596 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
599 memcpy(p,s->session->session_id,i);
604 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
606 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
609 *(p++) = s->d1->cookie_len;
610 memcpy(p, s->d1->cookie, s->d1->cookie_len);
611 p += s->d1->cookie_len;
613 /* Ciphers supported */
614 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
617 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
624 if (s->ctx->comp_methods == NULL)
627 j=sk_SSL_COMP_num(s->ctx->comp_methods);
631 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
634 *(p++)=0; /* Add the NULL method */
639 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
641 s->state=SSL3_ST_CW_CLNT_HELLO_B;
642 /* number of bytes to write */
646 /* buffer the message to handle re-xmits */
647 dtls1_buffer_message(s, 0);
650 /* SSL3_ST_CW_CLNT_HELLO_B */
651 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
656 static int dtls1_get_hello_verify(SSL *s)
660 unsigned int cookie_len;
662 n=s->method->ssl_get_message(s,
663 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
664 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
669 if (!ok) return((int)n);
671 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
673 s->d1->send_cookie = 0;
674 s->s3->tmp.reuse_message=1;
678 data = (unsigned char *)s->init_msg;
680 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
682 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
683 s->version=(s->version&0xff00)|data[1];
684 al = SSL_AD_PROTOCOL_VERSION;
689 cookie_len = *(data++);
690 if ( cookie_len > sizeof(s->d1->cookie))
692 al=SSL_AD_ILLEGAL_PARAMETER;
696 memcpy(s->d1->cookie, data, cookie_len);
697 s->d1->cookie_len = cookie_len;
699 s->d1->send_cookie = 1;
703 ssl3_send_alert(s, SSL3_AL_FATAL, al);
707 int dtls1_send_client_key_exchange(SSL *s)
712 #ifndef OPENSSL_NO_RSA
716 #ifndef OPENSSL_NO_KRB5
718 #endif /* OPENSSL_NO_KRB5 */
720 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
722 d=(unsigned char *)s->init_buf->data;
723 p= &(d[DTLS1_HM_HEADER_LENGTH]);
725 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
727 /* Fool emacs indentation */
729 #ifndef OPENSSL_NO_RSA
730 else if (alg_k & SSL_kRSA)
733 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
735 if (s->session->sess_cert->peer_rsa_tmp != NULL)
736 rsa=s->session->sess_cert->peer_rsa_tmp;
739 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
740 if ((pkey == NULL) ||
741 (pkey->type != EVP_PKEY_RSA) ||
742 (pkey->pkey.rsa == NULL))
744 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
751 tmp_buf[0]=s->client_version>>8;
752 tmp_buf[1]=s->client_version&0xff;
753 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
756 s->session->master_key_length=sizeof tmp_buf;
759 /* Fix buf for TLS and [incidentally] DTLS */
760 if (s->version > SSL3_VERSION)
762 n=RSA_public_encrypt(sizeof tmp_buf,
763 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
765 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
766 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
770 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
774 /* Fix buf for TLS and [incidentally] DTLS */
775 if (s->version > SSL3_VERSION)
781 s->session->master_key_length=
782 s->method->ssl3_enc->generate_master_secret(s,
783 s->session->master_key,
784 tmp_buf,sizeof tmp_buf);
785 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
788 #ifndef OPENSSL_NO_KRB5
789 else if (alg_k & SSL_kKRB5)
791 krb5_error_code krb5rc;
792 KSSL_CTX *kssl_ctx = s->kssl_ctx;
793 /* krb5_data krb5_ap_req; */
794 krb5_data *enc_ticket;
795 krb5_data authenticator, *authp = NULL;
796 EVP_CIPHER_CTX ciph_ctx;
797 EVP_CIPHER *enc = NULL;
798 unsigned char iv[EVP_MAX_IV_LENGTH];
799 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
800 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
801 + EVP_MAX_IV_LENGTH];
802 int padl, outl = sizeof(epms);
804 EVP_CIPHER_CTX_init(&ciph_ctx);
807 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
809 #endif /* KSSL_DEBUG */
813 if (KRB5SENDAUTH) authp = &authenticator;
814 #endif /* KRB5SENDAUTH */
816 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
818 enc = kssl_map_enc(kssl_ctx->enctype);
823 printf("kssl_cget_tkt rtn %d\n", krb5rc);
824 if (krb5rc && kssl_err.text)
825 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
827 #endif /* KSSL_DEBUG */
831 ssl3_send_alert(s,SSL3_AL_FATAL,
832 SSL_AD_HANDSHAKE_FAILURE);
833 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
838 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
839 ** in place of RFC 2712 KerberosWrapper, as in:
841 ** Send ticket (copy to *p, set n = length)
842 ** n = krb5_ap_req.length;
843 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
844 ** if (krb5_ap_req.data)
845 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
847 ** Now using real RFC 2712 KerberosWrapper
848 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
849 ** Note: 2712 "opaque" types are here replaced
850 ** with a 2-byte length followed by the value.
852 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
853 ** Where "xx xx" = length bytes. Shown here with
854 ** optional authenticator omitted.
857 /* KerberosWrapper.Ticket */
858 s2n(enc_ticket->length,p);
859 memcpy(p, enc_ticket->data, enc_ticket->length);
860 p+= enc_ticket->length;
861 n = enc_ticket->length + 2;
863 /* KerberosWrapper.Authenticator */
864 if (authp && authp->length)
866 s2n(authp->length,p);
867 memcpy(p, authp->data, authp->length);
869 n+= authp->length + 2;
877 s2n(0,p);/* null authenticator length */
881 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
884 /* 20010420 VRS. Tried it this way; failed.
885 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
886 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
887 ** kssl_ctx->length);
888 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
891 memset(iv, 0, sizeof iv); /* per RFC 1510 */
892 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
894 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
896 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
898 if (outl > (int)sizeof epms)
900 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
903 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
905 /* KerberosWrapper.EncryptedPreMasterSecret */
907 memcpy(p, epms, outl);
911 s->session->master_key_length=
912 s->method->ssl3_enc->generate_master_secret(s,
913 s->session->master_key,
914 tmp_buf, sizeof tmp_buf);
916 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
917 OPENSSL_cleanse(epms, outl);
920 #ifndef OPENSSL_NO_DH
921 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
923 DH *dh_srvr,*dh_clnt;
925 if (s->session->sess_cert->peer_dh_tmp != NULL)
926 dh_srvr=s->session->sess_cert->peer_dh_tmp;
929 /* we get them from the cert */
930 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
931 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
935 /* generate a new random key */
936 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
938 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
941 if (!DH_generate_key(dh_clnt))
943 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
947 /* use the 'p' output buffer for the DH key, but
948 * make sure to clear it out afterwards */
950 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
954 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
958 /* generate master key from the result */
959 s->session->master_key_length=
960 s->method->ssl3_enc->generate_master_secret(s,
961 s->session->master_key,p,n);
965 /* send off the data */
966 n=BN_num_bytes(dh_clnt->pub_key);
968 BN_bn2bin(dh_clnt->pub_key,p);
973 /* perhaps clean things up a bit EAY EAY EAY EAY*/
978 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
979 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
983 d = dtls1_set_message_header(s, d,
984 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
986 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
988 l2n(s->d1->handshake_write_seq,d);
989 s->d1->handshake_write_seq++;
992 s->state=SSL3_ST_CW_KEY_EXCH_B;
993 /* number of bytes to write */
994 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
997 /* buffer the message to handle re-xmits */
998 dtls1_buffer_message(s, 0);
1001 /* SSL3_ST_CW_KEY_EXCH_B */
1002 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1007 int dtls1_send_client_verify(SSL *s)
1009 unsigned char *p,*d;
1010 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1012 #ifndef OPENSSL_NO_RSA
1016 #ifndef OPENSSL_NO_DSA
1020 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1022 d=(unsigned char *)s->init_buf->data;
1023 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1024 pkey=s->cert->key->privatekey;
1026 s->method->ssl3_enc->cert_verify_mac(s,
1028 &(data[MD5_DIGEST_LENGTH]));
1030 #ifndef OPENSSL_NO_RSA
1031 if (pkey->type == EVP_PKEY_RSA)
1033 s->method->ssl3_enc->cert_verify_mac(s,
1036 if (RSA_sign(NID_md5_sha1, data,
1037 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1038 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1040 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1048 #ifndef OPENSSL_NO_DSA
1049 if (pkey->type == EVP_PKEY_DSA)
1051 if (!DSA_sign(pkey->save_type,
1052 &(data[MD5_DIGEST_LENGTH]),
1053 SHA_DIGEST_LENGTH,&(p[2]),
1054 (unsigned int *)&j,pkey->pkey.dsa))
1056 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1065 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1069 d = dtls1_set_message_header(s, d,
1070 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1072 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1075 /* buffer the message to handle re-xmits */
1076 dtls1_buffer_message(s, 0);
1078 s->state = SSL3_ST_CW_CERT_VRFY_B;
1081 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1082 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1087 int dtls1_send_client_certificate(SSL *s)
1090 EVP_PKEY *pkey=NULL;
1094 if (s->state == SSL3_ST_CW_CERT_A)
1096 if ((s->cert == NULL) ||
1097 (s->cert->key->x509 == NULL) ||
1098 (s->cert->key->privatekey == NULL))
1099 s->state=SSL3_ST_CW_CERT_B;
1101 s->state=SSL3_ST_CW_CERT_C;
1104 /* We need to get a client cert */
1105 if (s->state == SSL3_ST_CW_CERT_B)
1107 /* If we get an error, we need to
1108 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1109 * We then get retied later */
1111 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1114 s->rwstate=SSL_X509_LOOKUP;
1117 s->rwstate=SSL_NOTHING;
1118 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1120 s->state=SSL3_ST_CW_CERT_B;
1121 if ( !SSL_use_certificate(s,x509) ||
1122 !SSL_use_PrivateKey(s,pkey))
1128 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1131 if (x509 != NULL) X509_free(x509);
1132 if (pkey != NULL) EVP_PKEY_free(pkey);
1135 if (s->version == SSL3_VERSION)
1137 s->s3->tmp.cert_req=0;
1138 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1143 s->s3->tmp.cert_req=2;
1147 /* Ok, we have a cert */
1148 s->state=SSL3_ST_CW_CERT_C;
1151 if (s->state == SSL3_ST_CW_CERT_C)
1153 s->state=SSL3_ST_CW_CERT_D;
1154 l=dtls1_output_cert_chain(s,
1155 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1159 /* set header called by dtls1_output_cert_chain() */
1161 /* buffer the message to handle re-xmits */
1162 dtls1_buffer_message(s, 0);
1164 /* SSL3_ST_CW_CERT_D */
1165 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));