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freebsd-skq/crypto/openssl/ssl/d1_clnt.c
Simon L. B. Nielsen 6a599222bb Merge OpenSSL 0.9.8m into head. 
This also "reverts" some FreeBSD local changes so we should now
be back to using entirely stock OpenSSL.  The local changes were
simple $FreeBSD$ lines additions, which were required in the CVS
days, and the patch for FreeBSD-SA-09:15.ssl which has been
superseded with OpenSSL 0.9.8m's RFC5746 'TLS renegotiation
extension' support.

MFC after:	3 weeks
2010-03-13 19:22:41 +00:00

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/* ssl/d1_clnt.c */
/*
* DTLS implementation written by Nagendra Modadugu
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
*/
/* ====================================================================
* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "ssl_locl.h"
#include "kssl_lcl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
static SSL_METHOD *dtls1_get_client_method(int ver);
static int dtls1_get_hello_verify(SSL *s);
static SSL_METHOD *dtls1_get_client_method(int ver)
{
if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
return(DTLSv1_client_method());
else
return(NULL);
}
IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
ssl_undefined_function,
dtls1_connect,
dtls1_get_client_method)
int dtls1_connect(SSL *s)
{
BUF_MEM *buf=NULL;
unsigned long Time=(unsigned long)time(NULL),l;
void (*cb)(const SSL *ssl,int type,int val)=NULL;
int ret= -1;
int new_state,state,skip=0;;
RAND_add(&Time,sizeof(Time),0);
ERR_clear_error();
clear_sys_error();
if (s->info_callback != NULL)
cb=s->info_callback;
else if (s->ctx->info_callback != NULL)
cb=s->ctx->info_callback;
s->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
for (;;)
{
state=s->state;
switch(s->state)
{
case SSL_ST_RENEGOTIATE:
s->new_session=1;
s->state=SSL_ST_CONNECT;
s->ctx->stats.sess_connect_renegotiate++;
/* break */
case SSL_ST_BEFORE:
case SSL_ST_CONNECT:
case SSL_ST_BEFORE|SSL_ST_CONNECT:
case SSL_ST_OK|SSL_ST_CONNECT:
s->server=0;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
(s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
{
SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
ret = -1;
goto end;
}
/* s->version=SSL3_VERSION; */
s->type=SSL_ST_CONNECT;
if (s->init_buf == NULL)
{
if ((buf=BUF_MEM_new()) == NULL)
{
ret= -1;
goto end;
}
if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
{
ret= -1;
goto end;
}
s->init_buf=buf;
buf=NULL;
}
if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
/* setup buffing BIO */
if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
/* don't push the buffering BIO quite yet */
s->state=SSL3_ST_CW_CLNT_HELLO_A;
s->ctx->stats.sess_connect++;
s->init_num=0;
/* mark client_random uninitialized */
memset(s->s3->client_random,0,sizeof(s->s3->client_random));
s->d1->send_cookie = 0;
s->hit = 0;
break;
case SSL3_ST_CW_CLNT_HELLO_A:
case SSL3_ST_CW_CLNT_HELLO_B:
s->shutdown=0;
/* every DTLS ClientHello resets Finished MAC */
ssl3_init_finished_mac(s);
dtls1_start_timer(s);
ret=dtls1_client_hello(s);
if (ret <= 0) goto end;
if ( s->d1->send_cookie)
{
s->state=SSL3_ST_CW_FLUSH;
s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
}
else
s->state=SSL3_ST_CR_SRVR_HELLO_A;
s->init_num=0;
/* turn on buffering for the next lot of output */
if (s->bbio != s->wbio)
s->wbio=BIO_push(s->bbio,s->wbio);
break;
case SSL3_ST_CR_SRVR_HELLO_A:
case SSL3_ST_CR_SRVR_HELLO_B:
ret=ssl3_get_server_hello(s);
if (ret <= 0) goto end;
else
{
dtls1_stop_timer(s);
if (s->hit)
s->state=SSL3_ST_CR_FINISHED_A;
else
s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
}
s->init_num=0;
break;
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
ret = dtls1_get_hello_verify(s);
if ( ret <= 0)
goto end;
dtls1_stop_timer(s);
if ( s->d1->send_cookie) /* start again, with a cookie */
s->state=SSL3_ST_CW_CLNT_HELLO_A;
else
s->state = SSL3_ST_CR_CERT_A;
s->init_num = 0;
break;
case SSL3_ST_CR_CERT_A:
case SSL3_ST_CR_CERT_B:
#ifndef OPENSSL_NO_TLSEXT
ret=ssl3_check_finished(s);
if (ret <= 0) goto end;
if (ret == 2)
{
s->hit = 1;
if (s->tlsext_ticket_expected)
s->state=SSL3_ST_CR_SESSION_TICKET_A;
else
s->state=SSL3_ST_CR_FINISHED_A;
s->init_num=0;
break;
}
#endif
/* Check if it is anon DH */
if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
{
ret=ssl3_get_server_certificate(s);
if (ret <= 0) goto end;
#ifndef OPENSSL_NO_TLSEXT
if (s->tlsext_status_expected)
s->state=SSL3_ST_CR_CERT_STATUS_A;
else
s->state=SSL3_ST_CR_KEY_EXCH_A;
}
else
{
skip = 1;
s->state=SSL3_ST_CR_KEY_EXCH_A;
}
#else
}
else
skip=1;
s->state=SSL3_ST_CR_KEY_EXCH_A;
#endif
s->init_num=0;
break;
case SSL3_ST_CR_KEY_EXCH_A:
case SSL3_ST_CR_KEY_EXCH_B:
ret=ssl3_get_key_exchange(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_CR_CERT_REQ_A;
s->init_num=0;
/* at this point we check that we have the
* required stuff from the server */
if (!ssl3_check_cert_and_algorithm(s))
{
ret= -1;
goto end;
}
break;
case SSL3_ST_CR_CERT_REQ_A:
case SSL3_ST_CR_CERT_REQ_B:
ret=ssl3_get_certificate_request(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_CR_SRVR_DONE_A;
s->init_num=0;
break;
case SSL3_ST_CR_SRVR_DONE_A:
case SSL3_ST_CR_SRVR_DONE_B:
ret=ssl3_get_server_done(s);
if (ret <= 0) goto end;
if (s->s3->tmp.cert_req)
s->state=SSL3_ST_CW_CERT_A;
else
s->state=SSL3_ST_CW_KEY_EXCH_A;
s->init_num=0;
break;
case SSL3_ST_CW_CERT_A:
case SSL3_ST_CW_CERT_B:
case SSL3_ST_CW_CERT_C:
case SSL3_ST_CW_CERT_D:
dtls1_start_timer(s);
ret=dtls1_send_client_certificate(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_CW_KEY_EXCH_A;
s->init_num=0;
break;
case SSL3_ST_CW_KEY_EXCH_A:
case SSL3_ST_CW_KEY_EXCH_B:
dtls1_start_timer(s);
ret=dtls1_send_client_key_exchange(s);
if (ret <= 0) goto end;
l=s->s3->tmp.new_cipher->algorithms;
/* EAY EAY EAY need to check for DH fix cert
* sent back */
/* For TLS, cert_req is set to 2, so a cert chain
* of nothing is sent, but no verify packet is sent */
if (s->s3->tmp.cert_req == 1)
{
s->state=SSL3_ST_CW_CERT_VRFY_A;
}
else
{
s->state=SSL3_ST_CW_CHANGE_A;
s->s3->change_cipher_spec=0;
}
s->init_num=0;
break;
case SSL3_ST_CW_CERT_VRFY_A:
case SSL3_ST_CW_CERT_VRFY_B:
dtls1_start_timer(s);
ret=dtls1_send_client_verify(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_CW_CHANGE_A;
s->init_num=0;
s->s3->change_cipher_spec=0;
break;
case SSL3_ST_CW_CHANGE_A:
case SSL3_ST_CW_CHANGE_B:
dtls1_start_timer(s);
ret=dtls1_send_change_cipher_spec(s,
SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
if (ret <= 0) goto end;
s->state=SSL3_ST_CW_FINISHED_A;
s->init_num=0;
s->session->cipher=s->s3->tmp.new_cipher;
#ifdef OPENSSL_NO_COMP
s->session->compress_meth=0;
#else
if (s->s3->tmp.new_compression == NULL)
s->session->compress_meth=0;
else
s->session->compress_meth=
s->s3->tmp.new_compression->id;
#endif
if (!s->method->ssl3_enc->setup_key_block(s))
{
ret= -1;
goto end;
}
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CHANGE_CIPHER_CLIENT_WRITE))
{
ret= -1;
goto end;
}
dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
break;
case SSL3_ST_CW_FINISHED_A:
case SSL3_ST_CW_FINISHED_B:
dtls1_start_timer(s);
ret=dtls1_send_finished(s,
SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
s->method->ssl3_enc->client_finished_label,
s->method->ssl3_enc->client_finished_label_len);
if (ret <= 0) goto end;
s->state=SSL3_ST_CW_FLUSH;
/* clear flags */
s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
if (s->hit)
{
s->s3->tmp.next_state=SSL_ST_OK;
if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
{
s->state=SSL_ST_OK;
s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
s->s3->delay_buf_pop_ret=0;
}
}
else
{
#ifndef OPENSSL_NO_TLSEXT
/* Allow NewSessionTicket if ticket expected */
if (s->tlsext_ticket_expected)
s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
else
#endif
s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
}
s->init_num=0;
break;
#ifndef OPENSSL_NO_TLSEXT
case SSL3_ST_CR_SESSION_TICKET_A:
case SSL3_ST_CR_SESSION_TICKET_B:
ret=ssl3_get_new_session_ticket(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_CR_FINISHED_A;
s->init_num=0;
break;
case SSL3_ST_CR_CERT_STATUS_A:
case SSL3_ST_CR_CERT_STATUS_B:
ret=ssl3_get_cert_status(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_CR_KEY_EXCH_A;
s->init_num=0;
break;
#endif
case SSL3_ST_CR_FINISHED_A:
case SSL3_ST_CR_FINISHED_B:
s->d1->change_cipher_spec_ok = 1;
ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
SSL3_ST_CR_FINISHED_B);
if (ret <= 0) goto end;
dtls1_stop_timer(s);
if (s->hit)
s->state=SSL3_ST_CW_CHANGE_A;
else
s->state=SSL_ST_OK;
s->init_num=0;
break;
case SSL3_ST_CW_FLUSH:
s->rwstate=SSL_WRITING;
if (BIO_flush(s->wbio) <= 0)
{
ret= -1;
goto end;
}
s->rwstate=SSL_NOTHING;
s->state=s->s3->tmp.next_state;
break;
case SSL_ST_OK:
/* clean a few things up */
ssl3_cleanup_key_block(s);
#if 0
if (s->init_buf != NULL)
{
BUF_MEM_free(s->init_buf);
s->init_buf=NULL;
}
#endif
/* If we are not 'joining' the last two packets,
* remove the buffering now */
if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
ssl_free_wbio_buffer(s);
/* else do it later in ssl3_write */
s->init_num=0;
s->new_session=0;
ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
if (s->hit) s->ctx->stats.sess_hit++;
ret=1;
/* s->server=0; */
s->handshake_func=dtls1_connect;
s->ctx->stats.sess_connect_good++;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
/* done with handshaking */
s->d1->handshake_read_seq = 0;
s->d1->next_handshake_write_seq = 0;
goto end;
/* break; */
default:
SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
ret= -1;
goto end;
/* break; */
}
/* did we do anything */
if (!s->s3->tmp.reuse_message && !skip)
{
if (s->debug)
{
if ((ret=BIO_flush(s->wbio)) <= 0)
goto end;
}
if ((cb != NULL) && (s->state != state))
{
new_state=s->state;
s->state=state;
cb(s,SSL_CB_CONNECT_LOOP,1);
s->state=new_state;
}
}
skip=0;
}
end:
s->in_handshake--;
if (buf != NULL)
BUF_MEM_free(buf);
if (cb != NULL)
cb(s,SSL_CB_CONNECT_EXIT,ret);
return(ret);
}
int dtls1_client_hello(SSL *s)
{
unsigned char *buf;
unsigned char *p,*d;
unsigned int i,j;
unsigned long Time,l;
SSL_COMP *comp;
buf=(unsigned char *)s->init_buf->data;
if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
{
SSL_SESSION *sess = s->session;
if ((s->session == NULL) ||
(s->session->ssl_version != s->version) ||
#ifdef OPENSSL_NO_TLSEXT
!sess->session_id_length ||
#else
(!sess->session_id_length && !sess->tlsext_tick) ||
#endif
(s->session->not_resumable))
{
if (!ssl_get_new_session(s,0))
goto err;
}
/* else use the pre-loaded session */
p=s->s3->client_random;
/* if client_random is initialized, reuse it, we are
* required to use same upon reply to HelloVerify */
for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
if (i==sizeof(s->s3->client_random))
{
Time=(unsigned long)time(NULL); /* Time */
l2n(Time,p);
RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
}
/* Do the message type and length last */
d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
*(p++)=s->version>>8;
*(p++)=s->version&0xff;
s->client_version=s->version;
/* Random stuff */
memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
/* Session ID */
if (s->new_session)
i=0;
else
i=s->session->session_id_length;
*(p++)=i;
if (i != 0)
{
if (i > sizeof s->session->session_id)
{
SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
goto err;
}
memcpy(p,s->session->session_id,i);
p+=i;
}
/* cookie stuff */
if ( s->d1->cookie_len > sizeof(s->d1->cookie))
{
SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
goto err;
}
*(p++) = s->d1->cookie_len;
memcpy(p, s->d1->cookie, s->d1->cookie_len);
p += s->d1->cookie_len;
/* Ciphers supported */
i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
if (i == 0)
{
SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
goto err;
}
s2n(i,p);
p+=i;
/* COMPRESSION */
if (s->ctx->comp_methods == NULL)
j=0;
else
j=sk_SSL_COMP_num(s->ctx->comp_methods);
*(p++)=1+j;
for (i=0; i<j; i++)
{
comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
*(p++)=comp->id;
}
*(p++)=0; /* Add the NULL method */
#ifndef OPENSSL_NO_TLSEXT
if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
{
SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
goto err;
}
#endif
l=(p-d);
d=buf;
d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
s->state=SSL3_ST_CW_CLNT_HELLO_B;
/* number of bytes to write */
s->init_num=p-buf;
s->init_off=0;
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
}
/* SSL3_ST_CW_CLNT_HELLO_B */
return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
return(-1);
}
static int dtls1_get_hello_verify(SSL *s)
{
int n, al, ok = 0;
unsigned char *data;
unsigned int cookie_len;
n=s->method->ssl_get_message(s,
DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
-1,
s->max_cert_list,
&ok);
if (!ok) return((int)n);
if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
{
s->d1->send_cookie = 0;
s->s3->tmp.reuse_message=1;
return(1);
}
data = (unsigned char *)s->init_msg;
if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
{
SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
s->version=(s->version&0xff00)|data[1];
al = SSL_AD_PROTOCOL_VERSION;
goto f_err;
}
data+=2;
cookie_len = *(data++);
if ( cookie_len > sizeof(s->d1->cookie))
{
al=SSL_AD_ILLEGAL_PARAMETER;
goto f_err;
}
memcpy(s->d1->cookie, data, cookie_len);
s->d1->cookie_len = cookie_len;
s->d1->send_cookie = 1;
return 1;
f_err:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
return -1;
}
int dtls1_send_client_key_exchange(SSL *s)
{
unsigned char *p,*d;
int n;
unsigned long l;
#ifndef OPENSSL_NO_RSA
unsigned char *q;
EVP_PKEY *pkey=NULL;
#endif
#ifndef OPENSSL_NO_KRB5
KSSL_ERR kssl_err;
#endif /* OPENSSL_NO_KRB5 */
if (s->state == SSL3_ST_CW_KEY_EXCH_A)
{
d=(unsigned char *)s->init_buf->data;
p= &(d[DTLS1_HM_HEADER_LENGTH]);
l=s->s3->tmp.new_cipher->algorithms;
/* Fool emacs indentation */
if (0) {}
#ifndef OPENSSL_NO_RSA
else if (l & SSL_kRSA)
{
RSA *rsa;
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
if (s->session->sess_cert->peer_rsa_tmp != NULL)
rsa=s->session->sess_cert->peer_rsa_tmp;
else
{
pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
if ((pkey == NULL) ||
(pkey->type != EVP_PKEY_RSA) ||
(pkey->pkey.rsa == NULL))
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
goto err;
}
rsa=pkey->pkey.rsa;
EVP_PKEY_free(pkey);
}
tmp_buf[0]=s->client_version>>8;
tmp_buf[1]=s->client_version&0xff;
if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
goto err;
s->session->master_key_length=sizeof tmp_buf;
q=p;
/* Fix buf for TLS and [incidentally] DTLS */
if (s->version > SSL3_VERSION)
p+=2;
n=RSA_public_encrypt(sizeof tmp_buf,
tmp_buf,p,rsa,RSA_PKCS1_PADDING);
#ifdef PKCS1_CHECK
if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
#endif
if (n <= 0)
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
goto err;
}
/* Fix buf for TLS and [incidentally] DTLS */
if (s->version > SSL3_VERSION)
{
s2n(n,q);
n+=2;
}
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key,
tmp_buf,sizeof tmp_buf);
OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
}
#endif
#ifndef OPENSSL_NO_KRB5
else if (l & SSL_kKRB5)
{
krb5_error_code krb5rc;
KSSL_CTX *kssl_ctx = s->kssl_ctx;
/* krb5_data krb5_ap_req; */
krb5_data *enc_ticket;
krb5_data authenticator, *authp = NULL;
EVP_CIPHER_CTX ciph_ctx;
EVP_CIPHER *enc = NULL;
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
+ EVP_MAX_IV_LENGTH];
int padl, outl = sizeof(epms);
EVP_CIPHER_CTX_init(&ciph_ctx);
#ifdef KSSL_DEBUG
printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
l, SSL_kKRB5);
#endif /* KSSL_DEBUG */
authp = NULL;
#ifdef KRB5SENDAUTH
if (KRB5SENDAUTH) authp = &authenticator;
#endif /* KRB5SENDAUTH */
krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
&kssl_err);
enc = kssl_map_enc(kssl_ctx->enctype);
if (enc == NULL)
goto err;
#ifdef KSSL_DEBUG
{
printf("kssl_cget_tkt rtn %d\n", krb5rc);
if (krb5rc && kssl_err.text)
printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
}
#endif /* KSSL_DEBUG */
if (krb5rc)
{
ssl3_send_alert(s,SSL3_AL_FATAL,
SSL_AD_HANDSHAKE_FAILURE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
kssl_err.reason);
goto err;
}
/* 20010406 VRS - Earlier versions used KRB5 AP_REQ
** in place of RFC 2712 KerberosWrapper, as in:
**
** Send ticket (copy to *p, set n = length)
** n = krb5_ap_req.length;
** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
** if (krb5_ap_req.data)
** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
**
** Now using real RFC 2712 KerberosWrapper
** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
** Note: 2712 "opaque" types are here replaced
** with a 2-byte length followed by the value.
** Example:
** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
** Where "xx xx" = length bytes. Shown here with
** optional authenticator omitted.
*/
/* KerberosWrapper.Ticket */
s2n(enc_ticket->length,p);
memcpy(p, enc_ticket->data, enc_ticket->length);
p+= enc_ticket->length;
n = enc_ticket->length + 2;
/* KerberosWrapper.Authenticator */
if (authp && authp->length)
{
s2n(authp->length,p);
memcpy(p, authp->data, authp->length);
p+= authp->length;
n+= authp->length + 2;
free(authp->data);
authp->data = NULL;
authp->length = 0;
}
else
{
s2n(0,p);/* null authenticator length */
n+=2;
}
if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
goto err;
/* 20010420 VRS. Tried it this way; failed.
** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
** kssl_ctx->length);
** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
*/
memset(iv, 0, sizeof iv); /* per RFC 1510 */
EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
kssl_ctx->key,iv);
EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
sizeof tmp_buf);
EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
outl += padl;
if (outl > sizeof epms)
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
goto err;
}
EVP_CIPHER_CTX_cleanup(&ciph_ctx);
/* KerberosWrapper.EncryptedPreMasterSecret */
s2n(outl,p);
memcpy(p, epms, outl);
p+=outl;
n+=outl + 2;
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key,
tmp_buf, sizeof tmp_buf);
OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
OPENSSL_cleanse(epms, outl);
}
#endif
#ifndef OPENSSL_NO_DH
else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
{
DH *dh_srvr,*dh_clnt;
if (s->session->sess_cert->peer_dh_tmp != NULL)
dh_srvr=s->session->sess_cert->peer_dh_tmp;
else
{
/* we get them from the cert */
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
goto err;
}
/* generate a new random key */
if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
}
if (!DH_generate_key(dh_clnt))
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
}
/* use the 'p' output buffer for the DH key, but
* make sure to clear it out afterwards */
n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
if (n <= 0)
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
}
/* generate master key from the result */
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key,p,n);
/* clean up */
memset(p,0,n);
/* send off the data */
n=BN_num_bytes(dh_clnt->pub_key);
s2n(n,p);
BN_bn2bin(dh_clnt->pub_key,p);
n+=2;
DH_free(dh_clnt);
/* perhaps clean things up a bit EAY EAY EAY EAY*/
}
#endif
else
{
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
goto err;
}
d = dtls1_set_message_header(s, d,
SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
/*
*(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
l2n3(n,d);
l2n(s->d1->handshake_write_seq,d);
s->d1->handshake_write_seq++;
*/
s->state=SSL3_ST_CW_KEY_EXCH_B;
/* number of bytes to write */
s->init_num=n+DTLS1_HM_HEADER_LENGTH;
s->init_off=0;
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
}
/* SSL3_ST_CW_KEY_EXCH_B */
return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
return(-1);
}
int dtls1_send_client_verify(SSL *s)
{
unsigned char *p,*d;
unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
EVP_PKEY *pkey;
#ifndef OPENSSL_NO_RSA
unsigned u=0;
#endif
unsigned long n;
#ifndef OPENSSL_NO_DSA
int j;
#endif
if (s->state == SSL3_ST_CW_CERT_VRFY_A)
{
d=(unsigned char *)s->init_buf->data;
p= &(d[DTLS1_HM_HEADER_LENGTH]);
pkey=s->cert->key->privatekey;
s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
&(data[MD5_DIGEST_LENGTH]));
#ifndef OPENSSL_NO_RSA
if (pkey->type == EVP_PKEY_RSA)
{
s->method->ssl3_enc->cert_verify_mac(s,
&(s->s3->finish_dgst1),&(data[0]));
if (RSA_sign(NID_md5_sha1, data,
MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
&(p[2]), &u, pkey->pkey.rsa) <= 0 )
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
goto err;
}
s2n(u,p);
n=u+2;
}
else
#endif
#ifndef OPENSSL_NO_DSA
if (pkey->type == EVP_PKEY_DSA)
{
if (!DSA_sign(pkey->save_type,
&(data[MD5_DIGEST_LENGTH]),
SHA_DIGEST_LENGTH,&(p[2]),
(unsigned int *)&j,pkey->pkey.dsa))
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
goto err;
}
s2n(j,p);
n=j+2;
}
else
#endif
{
SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
goto err;
}
d = dtls1_set_message_header(s, d,
SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
s->init_off=0;
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
s->state = SSL3_ST_CW_CERT_VRFY_B;
}
/* s->state = SSL3_ST_CW_CERT_VRFY_B */
return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
return(-1);
}
int dtls1_send_client_certificate(SSL *s)
{
X509 *x509=NULL;
EVP_PKEY *pkey=NULL;
int i;
unsigned long l;
if (s->state == SSL3_ST_CW_CERT_A)
{
if ((s->cert == NULL) ||
(s->cert->key->x509 == NULL) ||
(s->cert->key->privatekey == NULL))
s->state=SSL3_ST_CW_CERT_B;
else
s->state=SSL3_ST_CW_CERT_C;
}
/* We need to get a client cert */
if (s->state == SSL3_ST_CW_CERT_B)
{
/* If we get an error, we need to
* ssl->rwstate=SSL_X509_LOOKUP; return(-1);
* We then get retied later */
i=0;
i = ssl_do_client_cert_cb(s, &x509, &pkey);
if (i < 0)
{
s->rwstate=SSL_X509_LOOKUP;
return(-1);
}
s->rwstate=SSL_NOTHING;
if ((i == 1) && (pkey != NULL) && (x509 != NULL))
{
s->state=SSL3_ST_CW_CERT_B;
if ( !SSL_use_certificate(s,x509) ||
!SSL_use_PrivateKey(s,pkey))
i=0;
}
else if (i == 1)
{
i=0;
SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
}
if (x509 != NULL) X509_free(x509);
if (pkey != NULL) EVP_PKEY_free(pkey);
if (i == 0)
{
if (s->version == SSL3_VERSION)
{
s->s3->tmp.cert_req=0;
ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
return(1);
}
else
{
s->s3->tmp.cert_req=2;
}
}
/* Ok, we have a cert */
s->state=SSL3_ST_CW_CERT_C;
}
if (s->state == SSL3_ST_CW_CERT_C)
{
s->state=SSL3_ST_CW_CERT_D;
l=dtls1_output_cert_chain(s,
(s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
s->init_num=(int)l;
s->init_off=0;
/* set header called by dtls1_output_cert_chain() */
/* buffer the message to handle re-xmits */
dtls1_buffer_message(s, 0);
}
/* SSL3_ST_CW_CERT_D */
return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
}
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