XSS过滤函数 PHP

转载地址：

http://bbs.php100.com/read-htm-tid-41980.html

http://www.neatstudio.com/show-378-1.shtml

http://qa.taobao.com/?p=12129

http://chaoyueziwo21.blogbus.com/logs/20491494.html

第一个是老外写的

第二个是phpcms2008的（global.func.php文件中）
好好比较下，学习学习。个人推荐第二个。呵呵。适用第二个的时候最好能定义下ALLOWED_HTMLTAGS=""或者你允许的标签

本部分设定了隐藏，您已回复过了，以下是隐藏的内容

复制代码

2. function RemoveXSS($val) {
3.    // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
4.    // this prevents some character re-spacing such as <javascript>
5.    // note that you have to handle splits with , , and later since they *are* allowed in some inputs
6.    $val = preg_replace("/([x00-x08,x0b-x0c,x0e-x19])/", "", $val);
8.    // straight replacements, the user should never need these since they"re normal characters
9.    // this prevents like <IMG SRC=@avascript:alert("XSS")>
10.    $search = "abcdefghijklmnopqrstuvwxyz";
11.    $search .= "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
12.    $search .= "1234567890!@#$%^&*()";
13.    $search .= "~`";:?+/={}[]-_|"\";
14.    for ($i = 0; $i < strlen($search); $i++) {
15.       // ;? matches the ;, which is optional
16.       // 0{0,7} matches any padded zeros, which are optional and go up to 8 chars
18.       // @ @ search for the hex values
19.       $val = preg_replace("/(&#[xX]0{0,8}".dechex(ord($search[$i])).";?)/i", $search[$i], $val); // with a ;
20.       // @ @ 0{0,7} matches "0" zero to seven times
21.       $val = preg_replace("/(&#0{0,8}".ord($search[$i]).";?)/", $search[$i], $val); // with a ;
22.    }
24.    // now the only remaining whitespace attacks are , , and
25.    $ra1 = Array("javascript", "vbscript", "expression", "applet", "meta", "xml", "blink", "link", "style", "script", "embed", "object", "iframe", "frame", "frameset", "ilayer", "layer", "bgsound", "title", "base");
26.    $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");
27.    $ra = array_merge($ra1, $ra2);
29.    $found = true; // keep replacing as long as the previous round replaced something
30.    while ($found == true) {
31.       $val_before = $val;
32.       for ($i = 0; $i < sizeof($ra); $i++) {
33.          $pattern = "/";
34.          for ($j = 0; $j < strlen($ra[$i]); $j++) {
35.             if ($j > 0) {
36.                $pattern .= "(";
37.                $pattern .= "(&#[xX]0{0,8}([9ab]);)";
38.                $pattern .= "|";
39.                $pattern .= "|(&#0{0,8}([9|10|13]);)";
40.                $pattern .= ")*";
41.             }
42.             $pattern .= $ra[$i][$j];
43.          }
44.          $pattern .= "/i";
45.          $replacement = substr($ra[$i], 0, 2)."<x>".substr($ra[$i], 2); // add in <> to nerf the tag
46.          $val = preg_replace($pattern, $replacement, $val); // filter out the hex tags
47.          if ($val_before == $val) {
48.             // no replacements were made, so exit the loop
49.             $found = false;
50.          }
51.       }
52.    }
53.    return $val;
54. }
56. function filter_xss($string, $allowedtags = "", $disabledattributes = array("onabort", "onactivate", "onafterprint", "onafterupdate", "onbeforeactivate", "onbeforecopy", "onbeforecut", "onbeforedeactivate", "onbeforeeditfocus", "onbeforepaste", "onbeforeprint", "onbeforeunload", "onbeforeupdate", "onblur", "onbounce", "oncellchange", "onchange", "onclick", "oncontextmenu", "oncontrolselect", "oncopy", "oncut", "ondataavaible", "ondatasetchanged", "ondatasetcomplete", "ondblclick", "ondeactivate", "ondrag", "ondragdrop", "ondragend", "ondragenter", "ondragleave", "ondragover", "ondragstart", "ondrop", "onerror", "onerrorupdate", "onfilterupdate", "onfinish", "onfocus", "onfocusin", "onfocusout", "onhelp", "onkeydown", "onkeypress", "onkeyup", "onlayoutcomplete", "onload", "onlosecapture", "onmousedown", "onmouseenter", "onmouseleave", "onmousemove", "onmoveout", "onmouseover", "onmouseup", "onmousewheel", "onmove", "onmoveend", "onmovestart", "onpaste", "onpropertychange", "onreadystatechange", "onreset", "onresize", "onresizeend", "onresizestart", "onrowexit", "onrowsdelete", "onrowsinserted", "onscroll", "onselect", "onselectionchange", "onselectstart", "onstart", "onstop", "onsubmit", "onunload"))
57. {
58.     if(is_array($string))
59.     {
60.         foreach($string as $key => $val) $string[$key] = filter_xss($val, ALLOWED_HTMLTAGS);
61.     }
62.     else
63.     {
64.         $string = preg_replace("/s(".implode("|", $disabledattributes).").*?([s>])/", "\2", preg_replace("/<(.*?)>/ie", ""<".preg_replace(array("/javascript:[^""]*/i", "/(".implode("|", $disabledattributes).")[ \t\n]*=[ \t\n]*[""][^""]*[""]/i", "/s+/"), array("", "", " "), stripslashes("\1")) . ">"", strip_tags($string, $allowedtags)));
65.     }
66.     return $string;
67. }