Example of CI Framework Security Filter Function
- 2021-10-24 19:02:30
- OfStack
In this paper, an example is given to describe the security filtering function of CI framework. Share it for your reference, as follows:
1. CI Framework Version:
/**
* Automatically filter variables and perform XSS Go empty
* Support: Single string, multidimensional array, number
* @param type $param = ' General string ' Or array(' String 1',' String 2');
* @return string|array
*/
final protected function html_trim($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;
}
Used as follows:
$this->html_trim($this->input->post('refer_url',TRUE));
Since the second parameter is TRUE, xss filtering has been performed by default
2. Native PHP version
/**
* Security filter class - Filter javascript,css,iframes,object Equal unsafe parameters High filtering level
* @param string $value Values to be filtered
* @return string
*/
function fliter_script($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;
}
/**
* Security filter class - Filter HTML Label
* @param string $value Values to be filtered
* @return string
*/
function fliter_html($value) {
if (function_exists('htmlspecialchars')) return htmlspecialchars($value);
return str_replace(array("&", '"', "'", "<", ">"), array("&", "\"", "'", "<", ">"), $value);
}
/**
* Security filter class - Underline the incoming data Prevent SQL Injection
* @param string $value Values to be filtered
* @return string
*/
function fliter_sql($value) {
$sql = array("select", 'insert', "update", "delete", "\'", "\/\*",
"\.\.\/", "\.\/", "union", "into", "load_file", "outfile");
$sql_re = array("","","","","","","","","","","","");
return str_replace($sql, $sql_re, $value);
}
/**
* Security filter class - Universal data filtering
* @param string $value Variables to be filtered
* @return string|array
*/
function fliter_escape($value) {
if (is_array($value)) {
foreach ($value as $k => $v) {
$value[$k] = self::fliter_str($v);
}
} else {
$value = self::fliter_str($value);
}
return $value;
}
/**
* Security filter class - String filtering Filter special harmful characters
* @param string $value Values to be filtered
* @return string
*/
function fliter_str($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;
}
/**
* Safe transformation of private road strength
* @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;
}
/**
* Filter catalog
* @param string $path
* @return array
*/
public function filter_path($path) {
$path = str_replace(array("'",'#','=','`','$','%','&',';'), '', $path);
return rtrim(preg_replace('/(\/){2,}|(\\\){1,}/', '/', $path), '/');
}
/**
* Filter PHP Label
* @param string $string
* @return string
*/
public function filter_phptag($string) {
return str_replace(array(''), array('<?', '?>'), $string);
}
/**
* Security filter class - Return function
* @param string $value Values to be filtered
* @return string
*/
public function str_out($value) {
$badstr = array("<", ">", "%3C", "%3E");
$newstr = array("<", ">", "<", ">");
$value = str_replace($newstr, $badstr, $value);
return stripslashes($value); // Underline
}
More readers interested in CodeIgniter can check the topics of this site: "codeigniter Introduction Tutorial", "CI (CodeIgniter) Framework Advanced Tutorial", "php Excellent Development Framework Summary", "ThinkPHP Introduction Tutorial", "ThinkPHP Common Methods Summary", "Zend FrameWork Framework Introduction Tutorial", "php Object-Oriented Programming Introduction Tutorial", "php+mysql Database Operation Introduction Tutorial" and "php Common Database Operation Skills Summary"
I hope this article is helpful to the PHP programming based on CodeIgniter framework.