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[PHP]XSS 和 SQL注入 过滤方法

之前朋友和我分享了个很完整的过滤方法

发出来分享下,顺便当做收藏(说不定用到呢233)


XSS 过滤:

function XSS($val) {
    // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
    $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 <IMG SRC=&#X40&#X61&#X76&#X61&#X73&#X63&#X72&#X69&#X70&#X74&#X3A&#X61&#X6C&#X65&#X72&#X74&#X28&#X27&#X58&#X53&#X53&#X27&#X29>
    $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
        // &#x0040 @ search for the hex values
        $val = preg_replace('/(&#[x|X]0{0,8}' . dechex(ord($search[$i])) . ';?)/i', $search[$i], $val);
        // with a ;
        // &#00064 @ 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', 'blink', 'script', 'iframe', 'frameset', 'ilayer', 'bgsound');
    $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{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;
}


SQL注入过滤:

function sqlInjection($val) {
    if (get_magic_quotes_gpc()) {
        $val = stripslashes($val);
    }
    if (version_compare(phpversion(), "4.3.0") == "-1") {
        return mysql_escape_string($val);
    } else {
        return mysql_real_escape_string($val);
    }
}


本文标题:[PHP]XSS 和 SQL注入 过滤方法
本文链接:https://www.fghrsh.net/post/58.html
作者授权:除特别说明外,本文由 fghrsh 原创编译并授权 FGHRSH 的博客 刊载发布。
版权声明:本文使用「署名-非商业性使用-相同方式共享 4.0 国际」创作共享协议,转载或使用请遵守署名协议。

网友评论6

  1. 索菲亚m.suofeiya. 2016-10-20 17:08:26 回复

    文章写得不错,支持楼楼,继续加油!!

  1. 助美整形网 2016-10-20 09:48:23 回复

    这个怎么用的

  1. 王静 2016-07-14 19:31:58 回复

    感谢楼主分享,我很喜欢,谢谢。赞赞论文写作服务的评论

  1. 呵呵嗒 2016-06-30 21:11:57 回复

    do.php(手动斜眼

  1. Aaron 2016-06-09 10:55:58 回复

    我都是用htmlspecialchars。。。。

    1. fghrsh 2016-06-09 18:22:02 回复

      这是完美的过滤方法,htmlspecialchars对javascript:alert(1)这样的XSS没啥作用233

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