这篇文章主要介绍了CI框架安全过滤函数,结合实例形式分析了CodeIgniter框架去空、防止XSS的函数定义与使用方法,并附带了原生PHP进行各种常见安全过滤相关操作技巧,需要的朋友可以参考下
本文实例讲述了CI框架安全过滤函数。分享给大家供大家参考,具体如下:
1、CI框架版本:
/** * 自动过滤变量,进行XSS,去空 * 支持:单个字符串,多维数组,数字 * @param type $param = '常规字符串' 或 array('字符串1','字符串2'); * @return string|array */ final protected function html_trim($param='') { if(is_array($param) && !empty ($param)){ return ($param); } if(is_string($param)){ return htmlspecialchars(trim($param)); } if(is_numeric($param)) { return (int)$param; } return $param; }
使用方式为:
$this->html_trim($this->input->post('refer_url',TRUE));
由于第二个参数为TRUE,默认已经进行了xss过滤
2、原生PHP版本
/** * 安全过滤类-过滤javascript,css,iframes,object等不安全参数 过滤级别高 * @param string $value 需要过滤的值 * @return string */ function fliter_script($value) { $value = preg_replace("/(javascript:)?on(click|load|key|mouse|error|abort|move|unload|change|dblclick|move|reset|resize|submit)/i","&111n\\2",$value); $value = preg_replace("/(.*?)<\/script>/si","",$value); $value = preg_replace("/(.*?)<\/iframe>/si","",$value); $value = preg_replace ("//iesU", '', $value); return $value; } /** * 安全过滤类-过滤HTML标签 * @param string $value 需要过滤的值 * @return string */ function fliter_html($value) { if (function_exists('htmlspecialchars')) return htmlspecialchars($value); return str_replace(array("&", '"', "'", "<", ">"), array("&", "\"", "'", "<", ">"), $value); } /** * 安全过滤类-对进入的数据加下划线 防止SQL注入 * @param string $value 需要过滤的值 * @return string */ function fliter_sql($value) { $sql = array("select", 'insert', "update", "delete", "\'", "\/\*", "\.\.\/", "\.\/", "union", "into", "load_file", "outfile"); $sql_re = array("","","","","","","","","","","",""); return str_replace($sql, $sql_re, $value); } /** * 安全过滤类-通用数据过滤 * @param string $value 需要过滤的变量 * @return string|array */ function fliter_escape($value) { if (is_array($value)) { foreach ($value as $k => $v) { $value[$k] = self::fliter_str($v); } } else { $value = self::fliter_str($value); } return $value; } /** * 安全过滤类-字符串过滤 过滤特殊有危害字符 * @param string $value 需要过滤的值 * @return string */ function fliter_str($value) { $badstr = array("\0", "%00", "\r", '&', ' ', '"', "'", "<", ">", " ", "%3C", "%3E"); $newstr = array('', '', '', '&', ' ', '"', ''', "<", ">", " ", "<", ">"); $value = str_replace($badstr, $newstr, $value); $value = preg_replace('/&((#(\d{3,5}|x[a-fA-F0-9]{4}));)/', '&\\1', $value); return $value; } /** * 私有路劲安全转化 * @param string $fileName * @return string */ function filter_dir($fileName) { $tmpname = strtolower($fileName); $temp = array(':/',"\0", ".."); if (str_replace($temp, '', $tmpname) !== $tmpname) { return false; } return $fileName; } /** * 过滤目录 * @param string $path * @return array */ public function filter_path($path) { $path = str_replace(array("'",'#','=','`','$','%','&',';'), '', $path); return rtrim(preg_replace('/(\/){2,}|(\\\){1,}/', '/', $path), '/'); } /** * 过滤PHP标签 * @param string $string * @return string */ public function filter_phptag($string) { return str_replace(array(''), array('<?', '?>'), $string); } /** * 安全过滤类-返回函数 * @param string $value 需要过滤的值 * @return string */ public function str_out($value) { $badstr = array("<", ">", "%3C", "%3E"); $newstr = array("<", ">", "<", ">"); $value = str_replace($newstr, $badstr, $value); return stripslashes($value); //下划线 }
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