#include <stdio.h>
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include "ssl_locl.h"
static SSL_METHOD *ssl23_get_server_method(int ver);
int ssl23_get_client_hello(SSL *s);
static SSL_METHOD *ssl23_get_server_method(int ver)
{
#ifndef NO_SSL2
if (ver == SSL2_VERSION)
return(SSLv2_server_method());
#endif
if (ver == SSL3_VERSION)
return(SSLv3_server_method());
else if (ver == TLS1_VERSION)
return(TLSv1_server_method());
else
return(NULL);
}
SSL_METHOD *SSLv23_server_method(void)
{
static int init=1;
static SSL_METHOD SSLv23_server_data;
if (init)
{
memcpy((char *)&SSLv23_server_data,
(char *)sslv23_base_method(),sizeof(SSL_METHOD));
SSLv23_server_data.ssl_accept=ssl23_accept;
SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
init=0;
}
return(&SSLv23_server_data);
}
int ssl23_accept(SSL *s)
{
BUF_MEM *buf;
unsigned long Time=time(NULL);
void (*cb)()=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;
if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
s->in_handshake++;
for (;;)
{
state=s->state;
switch(s->state)
{
case SSL_ST_BEFORE:
case SSL_ST_ACCEPT:
case SSL_ST_BEFORE|SSL_ST_ACCEPT:
case SSL_ST_OK|SSL_ST_ACCEPT:
s->server=1;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
s->type=SSL_ST_ACCEPT;
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;
}
ssl3_init_finished_mac(s);
s->state=SSL23_ST_SR_CLNT_HELLO_A;
s->ctx->stats.sess_accept++;
s->init_num=0;
break;
case SSL23_ST_SR_CLNT_HELLO_A:
case SSL23_ST_SR_CLNT_HELLO_B:
s->shutdown=0;
ret=ssl23_get_client_hello(s);
if (ret >= 0) cb=NULL;
goto end;
default:
SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
ret= -1;
goto end;
}
if ((cb != NULL) && (s->state != state))
{
new_state=s->state;
s->state=state;
cb(s,SSL_CB_ACCEPT_LOOP,1);
s->state=new_state;
}
}
end:
if (cb != NULL)
cb(s,SSL_CB_ACCEPT_EXIT,ret);
s->in_handshake--;
return(ret);
}
int ssl23_get_client_hello(SSL *s)
{
char buf_space[11];
char *buf= &(buf_space[0]);
unsigned char *p,*d,*dd;
unsigned int i;
unsigned int csl,sil,cl;
int n=0,j;
int type=0;
int v[2];
#ifndef NO_RSA
int use_sslv2_strong=0;
#endif
if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
{
v[0]=v[1]=0;
if (!ssl3_setup_buffers(s)) goto err;
n=ssl23_read_bytes(s, sizeof buf_space);
if (n != sizeof buf_space) return(n);
p=s->packet;
memcpy(buf,p,n);
if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
{
if ((p[3] == 0x00) && (p[4] == 0x02))
{
v[0]=p[3]; v[1]=p[4];
if (!(s->options & SSL_OP_NO_SSLv2))
type=1;
}
else if (p[3] == SSL3_VERSION_MAJOR)
{
v[0]=p[3]; v[1]=p[4];
if (p[4] >= TLS1_VERSION_MINOR)
{
if (!(s->options & SSL_OP_NO_TLSv1))
{
s->version=TLS1_VERSION;
s->state=SSL23_ST_SR_CLNT_HELLO_B;
}
else if (!(s->options & SSL_OP_NO_SSLv3))
{
s->version=SSL3_VERSION;
s->state=SSL23_ST_SR_CLNT_HELLO_B;
}
else if (!(s->options & SSL_OP_NO_SSLv2))
{
type=1;
}
}
else if (!(s->options & SSL_OP_NO_SSLv3))
{
s->version=SSL3_VERSION;
s->state=SSL23_ST_SR_CLNT_HELLO_B;
}
else if (!(s->options & SSL_OP_NO_SSLv2))
type=1;
if (s->options & SSL_OP_NON_EXPORT_FIRST)
{
#if 0
STACK_OF(SSL_CIPHER) *sk;
SSL_CIPHER *c;
int ne2,ne3;
j=((p[0]&0x7f)<<8)|p[1];
if (j > (1024*4))
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
goto err;
}
n=ssl23_read_bytes(s,j+2);
if (n <= 0) return(n);
p=s->packet;
if ((buf=OPENSSL_malloc(n)) == NULL)
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
goto err;
}
memcpy(buf,p,n);
p+=5;
n2s(p,csl);
p+=4;
sk=ssl_bytes_to_cipher_list(
s,p,csl,NULL);
if (sk != NULL)
{
ne2=ne3=0;
for (j=0; j<sk_SSL_CIPHER_num(sk); j++)
{
c=sk_SSL_CIPHER_value(sk,j);
if (!SSL_C_IS_EXPORT(c))
{
if ((c->id>>24L) == 2L)
ne2=1;
else
ne3=1;
}
}
if (ne2 && !ne3)
{
type=1;
use_sslv2_strong=1;
goto next_bit;
}
}
#else
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_OPTION);
goto err;
#endif
}
}
}
else if ((p[0] == SSL3_RT_HANDSHAKE) &&
(p[1] == SSL3_VERSION_MAJOR) &&
(p[5] == SSL3_MT_CLIENT_HELLO) &&
((p[3] == 0 && p[4] < 5 )
|| (p[9] == p[1])))
{
v[0]=p[1];
if (p[3] == 0 && p[4] < 6)
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
goto err;
}
v[1]=p[10];
if (v[1] >= TLS1_VERSION_MINOR)
{
if (!(s->options & SSL_OP_NO_TLSv1))
{
s->version=TLS1_VERSION;
type=3;
}
else if (!(s->options & SSL_OP_NO_SSLv3))
{
s->version=SSL3_VERSION;
type=3;
}
}
else if (!(s->options & SSL_OP_NO_SSLv3))
{
s->version=SSL3_VERSION;
type=3;
}
}
else if ((strncmp("GET ", (char *)p,4) == 0) ||
(strncmp("POST ",(char *)p,5) == 0) ||
(strncmp("HEAD ",(char *)p,5) == 0) ||
(strncmp("PUT ", (char *)p,4) == 0))
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
goto err;
}
else if (strncmp("CONNECT",(char *)p,7) == 0)
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
goto err;
}
}
if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
{
type=2;
p=s->packet;
v[0] = p[3];
v[1] = p[4];
n=((p[0]&0x7f)<<8)|p[1];
if (n > (1024*4))
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
goto err;
}
j=ssl23_read_bytes(s,n+2);
if (j <= 0) return(j);
ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
p=s->packet;
p+=5;
n2s(p,csl);
n2s(p,sil);
n2s(p,cl);
d=(unsigned char *)s->init_buf->data;
if ((csl+sil+cl+11) != s->packet_length)
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
goto err;
}
*(d++) = SSL3_VERSION_MAJOR;
*(d++) = v[1];
i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
memset(d,0,SSL3_RANDOM_SIZE);
memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
d+=SSL3_RANDOM_SIZE;
*(d++)=0;
j=0;
dd=d;
d+=2;
for (i=0; i<csl; i+=3)
{
if (p[i] != 0) continue;
*(d++)=p[i+1];
*(d++)=p[i+2];
j+=2;
}
s2n(j,dd);
*(d++)=1;
*(d++)=0;
i=(d-(unsigned char *)s->init_buf->data);
s->s3->tmp.reuse_message=1;
s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
s->s3->tmp.message_size=i;
}
if (type == 1)
{
#ifdef NO_SSL2
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
goto err;
#else
if (s->s2 == NULL)
{
if (!ssl2_new(s))
goto err;
}
else
ssl2_clear(s);
if (s->s3 != NULL) ssl3_free(s);
if (!BUF_MEM_grow(s->init_buf,
SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
{
goto err;
}
s->state=SSL2_ST_GET_CLIENT_HELLO_A;
if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
use_sslv2_strong ||
(s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3))
s->s2->ssl2_rollback=0;
else
s->s2->ssl2_rollback=1;
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;
s->method=SSLv2_server_method();
s->handshake_func=s->method->ssl_accept;
#endif
}
if ((type == 2) || (type == 3))
{
if (!ssl_init_wbio_buffer(s,1)) goto err;
s->state=SSL3_ST_SR_CLNT_HELLO_A;
if (type == 3)
{
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;
}
else
{
s->packet_length=0;
s->s3->rbuf.left=0;
s->s3->rbuf.offset=0;
}
if (s->version == TLS1_VERSION)
s->method = TLSv1_server_method();
else
s->method = SSLv3_server_method();
#if 0
s->client_version=(v[0]<<8)|v[1];
#endif
s->handshake_func=s->method->ssl_accept;
}
if ((type < 1) || (type > 3))
{
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
goto err;
}
s->init_num=0;
if (buf != buf_space) OPENSSL_free(buf);
s->first_packet=1;
return(SSL_accept(s));
err:
if (buf != buf_space) OPENSSL_free(buf);
return(-1);
}