http://www.oldjun.com/blog/index.php/archives/18/ Looking for change zh-cn-utf8 http://blogs.law.harvard.edu/tech/rss Magike 1.2.0 Release oldjun http://www.oldjun.com/blog/index.php/archives/18/#comment-46 > http://www.oldjun.com/blog/index.php/archives/18/#comment-46 Thu, 17 Jul 2008 03:03:34 +0000 你好，欣赏你的博客，觉得你的内容挺不错的
希望能同贵blog合作，同更多的朋友一起分享您的内容
感兴趣的话，可以直接跟我联系，
QQ 120877855

]]> http://www.oldjun.com/blog/index.php/archives/18/#comment-58 > http://www.oldjun.com/blog/index.php/archives/18/#comment-58 Mon, 28 Jul 2008 18:13:47 +0000 经常看你写的安全类文章，学习了不少东西，感觉阁下的PHP水平不错，能否用PHP帮我写个过滤自定义CSS（比如校内网那种）危险字符的东西呢？
QQ:943304722

]]> http://www.oldjun.com/blog/index.php/archives/18/#comment-59 > http://www.oldjun.com/blog/index.php/archives/18/#comment-59 Mon, 28 Jul 2008 18:37:18 +0000 给个过滤思路也成，我实在是没有把握

]]> http://www.oldjun.com/blog/index.php/archives/18/#comment-60 > http://www.oldjun.com/blog/index.php/archives/18/#comment-60 Tue, 29 Jul 2008 02:11:10 +0000 function filter($str){
$file="keywords.txt";
$fp=fopen($file,"rb");
$content=fread($fp,filesize($file));
fclose($fp);
$keywords = explode("\n",$content);
foreach($keywords as $keys) {
$keys = str_replace(array("\n","\r"),"",$keys);
if(strpos($str,$keys)===false) {
continue;
}else {
$str="Bad words！";
break;
}
}
return $str;
}
很简单的思路，keywords.txt里把所有容易被XSS利用的关键词放进去，此法亦可以进行关键词过滤！

]]> http://www.oldjun.com/blog/index.php/archives/18/#comment-61 > http://www.oldjun.com/blog/index.php/archives/18/#comment-61 Tue, 29 Jul 2008 02:14:07 +0000 0) { 　$pattern .= '('; 　$pattern .= '(&#[x|X]0{0,8}([9][a][b]);?)?'; 　$pattern .= '|(�{0,8}([9][10][13]);?)?'; 　$pattern .= ')?'; } 　$pattern .= $ra[$i][$j]; } $pattern .= '/i'; $replacement = substr($ra[$i], 0, 2).''.substr($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 　$found = false; } } } }]]> 找了个国外牛人的代码，学习下吧：
function RemoveXSS($val) {
　// remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
　// this prevents some character re-spacing such as
　// 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-\x20])/', '', $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
$val = preg_replace('/(&#[x|X]0{0,8}'.dechex(ord($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 .= '(&#[x|X]0{0,8}([9][a][b]);?)?';
　$pattern .= '|(�{0,8}([9][10][13]);?)?';
　$pattern .= ')?';
}
　$pattern .= $ra[$i][$j];
}
$pattern .= '/i';
$replacement = substr($ra[$i], 0, 2).''.substr($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;
}
}
}
}

]]>