/* ssl/s23_clnt.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young ([email protected]).
* 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 ([email protected]).
*
* 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 ([email protected])"
* 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 ([email protected])"
*
* 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 <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
static SSL_METHOD *ssl23_get_client_method(int ver);
static int ssl23_client_hello(SSL *s);
static int ssl23_get_server_hello(SSL *s);
static SSL_METHOD *ssl23_get_client_method(int ver)
{
#ifndef OPENSSL_NO_SSL2
if (ver == SSL2_VERSION)
return(SSLv2_client_method());
#endif
if (ver == SSL3_VERSION)
return(SSLv3_client_method());
else if (ver == TLS1_VERSION)
return(TLSv1_client_method());
else
return(NULL);
}
IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
ssl_undefined_function,
ssl23_connect,
ssl23_get_client_method)
int ssl23_connect(SSL *s)
{
BUF_MEM *buf=NULL;
unsigned long Time=(unsigned long)time(NULL);
void (*cb)(const SSL *ssl,int type,int val)=NULL;
int ret= -1;
int new_state,state;
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_BEFORE:
case SSL_ST_CONNECT:
case SSL_ST_BEFORE|SSL_ST_CONNECT:
case SSL_ST_OK|SSL_ST_CONNECT:
if (s->session != NULL)
{
SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
ret= -1;
goto end;
}
s->server=0;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
/* s->version=TLS1_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; }
ssl3_init_finished_mac(s);
s->state=SSL23_ST_CW_CLNT_HELLO_A;
s->ctx->stats.sess_connect++;
s->init_num=0;
break;
case SSL23_ST_CW_CLNT_HELLO_A:
case SSL23_ST_CW_CLNT_HELLO_B:
s->shutdown=0;
ret=ssl23_client_hello(s);
if (ret <= 0) goto end;
s->state=SSL23_ST_CR_SRVR_HELLO_A;
s->init_num=0;
break;
case SSL23_ST_CR_SRVR_HELLO_A:
case SSL23_ST_CR_SRVR_HELLO_B:
ret=ssl23_get_server_hello(s);
if (ret >= 0) cb=NULL;
goto end;
/* break; */
default:
SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
ret= -1;
goto end;
/* break; */
}
if (s->debug) { (void)BIO_flush(s->wbio); }
if ((cb != NULL) && (s->state != state))
{
new_state=s->state;
s->state=state;
cb(s,SSL_CB_CONNECT_LOOP,1);
s->state=new_state;
}
}
end:
s->in_handshake--;
if (buf != NULL)
BUF_MEM_free(buf);
if (cb != NULL)
cb(s,SSL_CB_CONNECT_EXIT,ret);
return(ret);
}
static int ssl23_client_hello(SSL *s)
{
unsigned char *buf;
unsigned char *p,*d;
int i,j,ch_len;
unsigned long Time,l;
int ssl2_compat;
int version = 0, version_major, version_minor;
SSL_COMP *comp;
int ret;
ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
if (!(s->options & SSL_OP_NO_TLSv1))
{
version = TLS1_VERSION;
}
else if (!(s->options & SSL_OP_NO_SSLv3))
{
version = SSL3_VERSION;
}
else if (!(s->options & SSL_OP_NO_SSLv2))
{
version = SSL2_VERSION;
}
#ifndef OPENSSL_NO_TLSEXT
if (version != SSL2_VERSION)
{
/* have to disable SSL 2.0 compatibility if we need TLS extensions */
if (s->tlsext_hostname != NULL)
ssl2_compat = 0;
}
#endif
buf=(unsigned char *)s->init_buf->data;
if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
{
#if 0
/* don't reuse session-id's */
if (!ssl_get_new_session(s,0))
{
return(-1);
}
#endif
p=s->s3->client_random;
Time=(unsigned long)time(NULL); /* Time */
l2n(Time,p);
if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
return -1;
if (version == TLS1_VERSION)
{
version_major = TLS1_VERSION_MAJOR;
version_minor = TLS1_VERSION_MINOR;
}
else if (version == SSL3_VERSION)
{
version_major = SSL3_VERSION_MAJOR;
version_minor = SSL3_VERSION_MINOR;
}
else if (version == SSL2_VERSION)
{
version_major = SSL2_VERSION_MAJOR;
version_minor = SSL2_VERSION_MINOR;
}
else
{
SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
return(-1);
}
s->client_version = version;
if (ssl2_compat)
{
/* create SSL 2.0 compatible Client Hello */
/* two byte record header will be written last */
d = &(buf[2]);
p = d + 9; /* leave space for message type, version, individual length fields */
*(d++) = SSL2_MT_CLIENT_HELLO;
*(d++) = version_major;
*(d++) = version_minor;
/* Ciphers supported */
i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
if (i == 0)
{
/* no ciphers */
SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
return -1;
}
s2n(i,d);
p+=i;
/* put in the session-id length (zero since there is no reuse) */
#if 0
s->session->session_id_length=0;
#endif
s2n(0,d);
if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
ch_len=SSL2_CHALLENGE_LENGTH;
else
ch_len=SSL2_MAX_CHALLENGE_LENGTH;
/* write out sslv2 challenge */
if (SSL3_RANDOM_SIZE < ch_len)
i=SSL3_RANDOM_SIZE;
else
i=ch_len;
s2n(i,d);
memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
return -1;
memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
p+=i;
i= p- &(buf[2]);
buf[0]=((i>>8)&0xff)|0x80;
buf[1]=(i&0xff);
/* number of bytes to write */
s->init_num=i+2;
s->init_off=0;
ssl3_finish_mac(s,&(buf[2]),i);
}
else
{
/* create Client Hello in SSL 3.0/TLS 1.0 format */
/* do the record header (5 bytes) and handshake message header (4 bytes) last */
d = p = &(buf[9]);
*(p++) = version_major;
*(p++) = version_minor;
/* Random stuff */
memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
p += SSL3_RANDOM_SIZE;
/* Session ID (zero since there is no reuse) */
*(p++) = 0;
/* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
if (i == 0)
{
SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
return -1;
}
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_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
return -1;
}
#endif
l = p-d;
*p = 42;
/* fill in 4-byte handshake header */
d=&(buf[5]);
*(d++)=SSL3_MT_CLIENT_HELLO;
l2n3(l,d);
l += 4;
if (l > SSL3_RT_MAX_PLAIN_LENGTH)
{
SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
return -1;
}
/* fill in 5-byte record header */
d=buf;
*(d++) = SSL3_RT_HANDSHAKE;
*(d++) = version_major;
*(d++) = version_minor; /* arguably we should send the *lowest* suported version here
* (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
s2n((int)l,d);
/* number of bytes to write */
s->init_num=p-buf;
s->init_off=0;
ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
}
s->state=SSL23_ST_CW_CLNT_HELLO_B;
s->init_off=0;
}
/* SSL3_ST_CW_CLNT_HELLO_B */
ret = ssl23_write_bytes(s);
if ((ret >= 2) && s->msg_callback)
{
/* Client Hello has been sent; tell msg_callback */
if (ssl2_compat)
s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
else
s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
}
return ret;
}
static int ssl23_get_server_hello(SSL *s)
{
char buf[8];
unsigned char *p;
int i;
int n;
n=ssl23_read_bytes(s,7);
if (n != 7) return(n);
p=s->packet;
memcpy(buf,p,n);
if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
(p[5] == 0x00) && (p[6] == 0x02))
{
#ifdef OPENSSL_NO_SSL2
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
goto err;
#else
/* we are talking sslv2 */
/* we need to clean up the SSLv3 setup and put in the
* sslv2 stuff. */
int ch_len;
if (s->options & SSL_OP_NO_SSLv2)
{
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
goto err;
}
if (s->s2 == NULL)
{
if (!ssl2_new(s))
goto err;
}
else
ssl2_clear(s);
if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
ch_len=SSL2_CHALLENGE_LENGTH;
else
ch_len=SSL2_MAX_CHALLENGE_LENGTH;
/* write out sslv2 challenge */
i=(SSL3_RANDOM_SIZE < ch_len)
?SSL3_RANDOM_SIZE:ch_len;
s->s2->challenge_length=i;
memcpy(s->s2->challenge,
&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
if (s->s3 != NULL) ssl3_free(s);
if (!BUF_MEM_grow_clean(s->init_buf,
SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
{
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
goto err;
}
s->state=SSL2_ST_GET_SERVER_HELLO_A;
if (!(s->client_version == SSL2_VERSION))
/* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
s->s2->ssl2_rollback=1;
/* setup the 5 bytes we have read so we get them from
* the sslv2 buffer */
s->rstate=SSL_ST_READ_HEADER;
s->packet_length=n;
s->packet= &(s->s2->rbuf[0]);
memcpy(s->packet,buf,n);
s->s2->rbuf_left=n;
s->s2->rbuf_offs=0;
/* we have already written one */
s->s2->write_sequence=1;
s->method=SSLv2_client_method();
s->handshake_func=s->method->ssl_connect;
#endif
}
else if ((p[0] == SSL3_RT_HANDSHAKE) &&
(p[1] == SSL3_VERSION_MAJOR) &&
((p[2] == SSL3_VERSION_MINOR) ||
(p[2] == TLS1_VERSION_MINOR)) &&
(p[5] == SSL3_MT_SERVER_HELLO))
{
/* we have sslv3 or tls1 */
if (!ssl_init_wbio_buffer(s,1)) goto err;
/* we are in this state */
s->state=SSL3_ST_CR_SRVR_HELLO_A;
/* put the 5 bytes we have read into the input buffer
* for SSLv3 */
s->rstate=SSL_ST_READ_HEADER;
s->packet_length=n;
s->packet= &(s->s3->rbuf.buf[0]);
memcpy(s->packet,buf,n);
s->s3->rbuf.left=n;
s->s3->rbuf.offset=0;
if ((p[2] == SSL3_VERSION_MINOR) &&
!(s->options & SSL_OP_NO_SSLv3))
{
s->version=SSL3_VERSION;
s->method=SSLv3_client_method();
}
else if ((p[2] == TLS1_VERSION_MINOR) &&
!(s->options & SSL_OP_NO_TLSv1))
{
s->version=TLS1_VERSION;
s->method=TLSv1_client_method();
}
else
{
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
goto err;
}
s->handshake_func=s->method->ssl_connect;
}
else if ((p[0] == SSL3_RT_ALERT) &&
(p[1] == SSL3_VERSION_MAJOR) &&
((p[2] == SSL3_VERSION_MINOR) ||
(p[2] == TLS1_VERSION_MINOR)) &&
(p[3] == 0) &&
(p[4] == 2))
{
void (*cb)(const SSL *ssl,int type,int val)=NULL;
int j;
/* An alert */
if (s->info_callback != NULL)
cb=s->info_callback;
else if (s->ctx->info_callback != NULL)
cb=s->ctx->info_callback;
i=p[5];
if (cb != NULL)
{
j=(i<<8)|p[6];
cb(s,SSL_CB_READ_ALERT,j);
}
s->rwstate=SSL_NOTHING;
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
goto err;
}
else
{
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
goto err;
}
s->init_num=0;
/* Since, if we are sending a ssl23 client hello, we are not
* reusing a session-id */
if (!ssl_get_new_session(s,0))
goto err;
return(SSL_connect(s));
err:
return(-1);
}
|
