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Decode ClientHello v2 properly

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This commit is contained in:
William Robinet 2021-01-19 17:27:46 +01:00
parent fba06b5c79
commit 31464b75b0
1 changed files with 25 additions and 10 deletions
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35
ssl/sslprint.c
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@ -95,6 +95,7 @@ int process_v2_hello(ssl,seg)
{
int r;
int rec_len;
int _status;
UINT4 cs_len;
UINT4 sid_len;
UINT4 chall_len;
@ -104,36 +105,39 @@ int process_v2_hello(ssl,seg)
UCHAR random[32];
if(seg->len==0)
return(SSL_NO_DATA);
ABORT(SSL_NO_DATA);
d.data=seg->data;
d.len=seg->len;
/* First check the message length. */
if(d.len<4)
return(SSL_BAD_CONTENT_TYPE);
ABORT(SSL_BAD_CONTENT_TYPE);
rec_len=((d.data[0] & 0x7f)<<8) | (d.data[1]);
d.data+=2; d.len-=2;
if(d.len!=rec_len) /* Whatever this is it isn't valid SSLv2*/
return(SSL_BAD_CONTENT_TYPE);
ABORT(SSL_BAD_CONTENT_TYPE);
/* If msg_type==1 then we've got a v2 message (or trash)*/
if(*d.data++!=1)
return(SSL_BAD_CONTENT_TYPE);
ABORT(SSL_BAD_CONTENT_TYPE);
d.len--;
SSL_DECODE_UINT16(ssl,"Version number",P_DC,&d,&ver);
/* We can't handle real v2 clients*/
if(ver<=2){
explain(ssl,"Version 2 Client.\n");
return(SSL_BAD_DATA);
ABORT(SSL_BAD_DATA);
}
ssl->cur_json_st = json_object_new_object();
ssl_print_record_num(ssl);
ssl_print_timestamp(ssl,&seg->p->ts);
ssl_print_direction_indicator(ssl,DIR_I2R);
explain(ssl," SSLv2 compatible client hello\n");
json_object_object_add(ssl->cur_json_st, "msg_type", json_object_new_string("Handshake"));
json_object_object_add(ssl->cur_json_st, "handshake_type", json_object_new_string("ClientHello_v2_compat"));
INDENT_INCR;
@ -148,7 +152,7 @@ int process_v2_hello(ssl,seg)
if(cs_len%3){
fprintf(stderr,"Bad cipher spec length %d\n",cs_len);
return(SSL_BAD_DATA);
ABORT(SSL_BAD_DATA);
}
P_(P_HL){
explain(ssl,"cipher suites\n");
@ -166,12 +170,12 @@ int process_v2_hello(ssl,seg)
if(sid_len!=0){
fprintf(stderr,"Session ID field should be zero length\n");
return(SSL_BAD_DATA);
ABORT(SSL_BAD_DATA);
}
if(chall_len<16 || chall_len>32){
fprintf(stderr,"Invalid challenge length %d\n",chall_len);
return(SSL_BAD_DATA);
ABORT(SSL_BAD_DATA);
}
SSL_DECODE_OPAQUE_ARRAY(ssl,0,chall_len,
@ -195,7 +199,18 @@ int process_v2_hello(ssl,seg)
}
INDENT_POP;
return(0);
_status=0;
abort:
if(ssl->cur_json_st) {
if(SSL_print_flags & SSL_PRINT_JSON)
printf("%s\n", json_object_to_json_string(ssl->cur_json_st));
json_object_put(ssl->cur_json_st);
ssl->cur_json_st = NULL;
}
return(_status);
}
int ssl_decode_switch(ssl,dtable,value,dir,seg,data)