/** * XSS 清除处理 */ function xssClean($data, $htmlentities = 0) { $htmlentities && $data = htmlentities($data, ENT_QUOTES, 'utf-8'); // Fix &entity\n; $data = str_replace(array('&','<','>'), array('&amp;','&lt;','&gt;'), $data); $data = preg_replace('/(&#*\w+)[\x00-\x20]+;/u', '$1;', $data); $data = preg_replace('/(&#x*[0-9A-F]+);*/iu', '$1;', $data); $data = html_entity_decode($data, ENT_COMPAT, 'UTF-8'); // Remove any attribute starting with "on" or xmlns $data = preg_replace('#(<[^>]+?[\x00-\x20"\'])(?:on|xmlns)[^>]*+>#iu', '$1>', $data); // Remove javascript: and vbscript: protocols $data = preg_replace('#([a-z]*)[\x00-\x20]*=[\x00-\x20]*([`\'"\\\\]*)[\x00-\x20]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2nojavascript...', $data); $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"\\\\]*)[\x00-\x20]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2novbscript...', $data); $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"\\\\]*)[\x00-\x20]*-moz-binding[\x00-\x20]*:#u', '$1=$2nomozbinding...', $data); // Only works in IE: <span style="width: expression(alert('Ping!'));"></span> $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"\\\\]*.*?expression[\x00-\x20]*\([^>]*+>#i', '$1>', $data); $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"\\\\]*.*?behaviour[\x00-\x20]*\([^>]*+>#i', '$1>', $data); $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"\\\\]*.*?s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:*[^>]*+>#iu', '$1>', $data); // Remove namespaced elements (we do not need them) $data = preg_replace('#</*\w+:\w[^>]*+>#i', '', $data); do { // Remove really unwanted tags $old_data = $data; $data = preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i', '', $data); } while ($old_data !== $data); // we are done... $data = filter_remote_img_type($data, FALSE); return $data; } /** * 过滤内容中有问题网络图片 * @author phpseyo<[email protected]> * @param string $text 过滤文本 * @param boolean $bbcode 是否为BBCODE类型 * @return string */ function filter_remote_img_type($text, $bbcode = TRUE) { $pattern = $bbcode ? "/\[img[^\]]*\]\s*(.*?)+\s*\[\/img\]/is" : "/<img[^>]+src=[\'|\"]([^\'|\"]+)[\'|\"][^>]*[\/]?>/is"; preg_match_all($pattern, $text, $matches); foreach ($matches[1] as $k => $src) { $data = get_headers($src); $header_str = implode('', $data); if (FALSE === strpos($header_str, 'Content-Type: image') || FALSE !== strpos($header_str, 'HTTP/1.1 401') || FALSE !== strpos($header_str, 'HTTP/1.1 404')) { $text = str_replace($matches[0][$k], '', $text); } } return $text; }