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鸽子
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875天前<?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\0script> |
// 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 SRC=@avascript:alert('XSS')> |
$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]).';?)/', $search[$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[$i], 0, 2).'<x>'.substr($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; |
} |
?> |
