示例#1
0
文件: test2.php 项目: chenrizhi/mtpt
<?php

$aaa = "[img]http://pt.nwsuaf6.edu.cn/mybar.php?userid=208.png[/img]";
//echo TestIMG($aaa);
if (!TestIMG($aaa)) {
    die;
}
echo $aaa;
function TestIMG($value)
{
    preg_match_all('/\\[img=(.*?)\\]/', $value, $temp1);
    foreach ($temp1[1] as $temp11) {
        preg_match_all('/(.*?).php/', $temp11, $temp2);
        foreach ($temp2[1] as $temp22) {
            if (strlen($temp22) > 0 && substr(strrev($temp22), 0, 5) != "rabym") {
                //mybar
                return false;
            }
        }
    }
    preg_match_all('/\\[img\\](.*?)\\[\\/img\\]/', $value, $temp1);
    foreach ($temp1[1] as $temp11) {
        preg_match_all('/(.*?).php/', $temp11, $temp2);
        foreach ($temp2[1] as $temp22) {
            if (strlen($temp22) > 0 && substr(strrev($temp22), 0, 5) != "rabym") {
                //mybar
                return false;
            }
        }
    }
    return $value;
示例#2
0
function RemoveXSS($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])/', '', $val);
    TestIMG($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
        $val = preg_replace('/(&#0{0,8}' . ord($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{0,8}([9|10|13]);)';
                    $pattern .= ')*';
                }
                $pattern .= $ra[$i][$j];
            }
            $pattern .= '/i';
            // $replacement = substr($ra[$i], 0, 1).'&#'.ord($ra[$i][1]).';'.substr($ra[$i], 2); // add in <> to nerf the tag
            $replacement = substr($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;
}