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Merge pull request #82 from nayo/patch-1

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Function to prevent XSS attacks
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Deon George 2019-07-31 07:38:06 +08:00 committed by GitHub
commit cb9c0cce3e
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1 changed files with 12 additions and 5 deletions
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17
lib/functions.php
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@ -651,7 +651,7 @@ function error($msg,$type='note',$redirect=null,$fatal=false,$backtrace=false) {
*
* @return The form GET/REQUEST/SESSION/POST variable value or its default
*/
function get_request($attr,$type='POST',$die=false,$default=null) {
function get_request($attr,$type='POST',$die=false,$default=null,$preventXSS=false) {
switch($type) {
case 'GET':
$value = isset($_GET[$attr]) ? (is_array($_GET[$attr]) ? $_GET[$attr] : (empty($_GET['nodecode'][$attr]) ? rawurldecode($_GET[$attr]) : $_GET[$attr])) : $default;
@ -670,19 +670,26 @@ function get_request($attr,$type='POST',$die=false,$default=null) {
$value = isset($_POST[$attr]) ? (is_array($_POST[$attr]) ? $_POST[$attr] : (empty($_POST['nodecode'][$attr]) ? rawurldecode($_POST[$attr]) : $_POST[$attr])) : $default;
break;
}
if ($die && is_null($value))
system_message(array(
'title'=>_('Generic Error'),
'body'=>sprintf('%s: Called "%s" without "%s" using "%s"',
basename($_SERVER['PHP_SELF']),get_request('cmd','REQUEST'),$attr,$type),
basename($_SERVER['PHP_SELF']),get_request('cmd','REQUEST',false,null,true),preventXSS($attr),preventXSS($type)),
'type'=>'error'),
'index.php');
if($preventXSS && !is_null($value))
$value = preventXSS($value);
return $value;
}
/**
* Prevent XSS function. This function can usage has preventXSS(get_request('cmd','REQUEST'))
* Return valor escape XSS.
*/
function preventXSS($value){
return htmlspecialchars(addslashes($value), ENT_QUOTES, 'UTF-8');
}
* Record a system message.
* This function can be used as an alternative to generate a system message, if page hasnt yet been defined.
*/