過濾XSS的function－新‧夢想

過濾XSS的function

<?php 
 
 
function RemoveXSS($val) { 
 // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed 
 // this prevents some character re-spacing such as <java> 
 // 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 <img loading="lazy" src="https://imageproxy.pixnet.cc/imgproxy?url=@avascript:alert('XSS')" alt="" title=""> 
 $search = 'abcdefghijklmnopqrstuvwxyz'; 
 $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
 $search .= '1234567890!@#$%^&*()'; 
 $search .= '~`";:?+/={}[]-_|\'\\'; 
 for ($i = 0; $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]).';?)/', $search[$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 
 $pattern = '/'; 
 for ($j = 0; $j 
 if ($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[$i], 0, 2).'<x>'.substr($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; 
} 
 
?> </x></java>

原始網站: http://quickwired.com/smallprojects/php_xss_filter_function.php

kevin0523

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