PHP;">
function remove_xss($val) {
// remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
// this prevents some character re-spacing such as
// note that you have to handle splits with \n,\r,and \t later since they *are* allowed in some inputs
$val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/','',$val);
// straight replacements,the user should never need these since they're normal characters
// this prevents like )
$search = 'abcdefghijklmnopqrstuvwxyz';
$search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$search .= '1234567890!@#$%^&*()';
$search .= '~`";:?+/={}[]-_|\'\\';
for ($i = 0; $i < strlen($search);="" $i++)="" {="" ;?="" matches="" the="" ;,which="" is="" optional="" 0{0,7}="" matches="" any="" padded="" zeros,which="" are="" optional="" and="" go="" up="" to="" 8="" chars="" @="" @="" search="" for="" the="" hex="" values="" $val="preg_replace('/(&#[xX]0{0,8}'.dechex(ord($search[$i])).';?)/i',$search[$i],$val);" with="" a="" ;="" @="" @="" 0{0,7}="" matches="" '0'="" zero="" to="" seven="" times="" $val="preg_replace('/(�{0,8}'.ord($search[$i]).';?)/',$val);" with="" a="" ;="" }="">Now the only remaining whITespace attacks are \t,\n,and \r
$ra1 = array('javascript','vbscript','exPression','applet','Meta','XMl','blink','link','style','script','embed','object','iframe','frame','frameset','ilayer','layer','bgsound','title','base');
$ra2 = array('onabort','onactivate','onafterprint','onafterupdate','onbeforeactivate','onbeforecopy','onbeforecut','onbeforedeactivate','onbeforeeditfocus','onbeforepaste','onbeforeprint','onbeforeunload','onbeforeupdate','onblur','onbounce','oncellchange','onchange','onclick','oncontextmenu','oncontrolselect','oncopy','oncut','ondataavailable','ondatasetchanged','ondatasetcomplete','ondblclick','ondeactivate','onDrag','ondragend','ondragenter','ondragleave','ondragover','ondragstart','ondrop','onerror','onerrorupdate','onfilterchange','onfinish','onfocus','onfocusin','onfocusout','onhelp','onkeydown','onkeypress','onkeyup','onlayoutcomplete','onload','onlosecapture','onmousedown','onmouseenter','onmouseleave','onmouSEMove','onmouSEOut','onmouSEOver','onmouseup','onmousewheel','onmove','onmoveend','onmovestart','onpaste','onproPErtychange','onreadystatechange','onreset','onresize','onresizeend','onresizestart','onrowenter','onrowexit','onrowsdelete','onrowsinserted','onscroll','onselect','onselectionchange','onselectstart','onstart','onstop','onsubmit','onunload');
$ra = array_merge($ra1,$ra2);
$found = true; // keep replacing as long as the prevIoUs round replaced something
while ($found == true) {
$val_before = $val;
for ($i = 0; $i < sizeof($ra);="" $i++)="" {="" $pattern='/' ;="" for="" ($j="0;" $j="">< strlen($ra[$i]);="" $j++)="" {="" if="" ($j=""> 0) {
$pattern .= '(';
$pattern .= '(&#[xX]0{0,8}([9ab]);)';
$pattern .= '|';
$pattern .= '|(�{0,8}([9|10|13]);)';
$pattern .= ')*';
}
$pattern .= $ra[$i][$j];
}
$pattern .= '/i';
$replacement = substr($ra[$i],2).''.substr($ra[$i],2); // add in <> to nerf the tag
$val = preg_replace($pattern,$replacement,$val); // filter out the hex tags
if ($val_before == $val) {
// no replacements were made,so exit the loop
$found = false;
}
}
}
return $val;
}
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