PHP code snippets

Name

Ban Proxy Servers

Description

Bans most (but not all) proxy servers by detecting common "FORWARD" signatures in the header

PHP Snippet

<?PHP
 
IF(ISSET($_SERVER['HTTP_X_FORWARDED_FOR']) || ($_SERVER['HTTP_USER_AGENT']=='') || ($_SERVER['HTTP_VIA']!='')){
        DIE("Proxy servers not allowed.");
}
 
$proxy_headers = ARRAY(   
     'HTTP_VIA',   
     'HTTP_X_FORWARDED_FOR',   
     'HTTP_FORWARDED_FOR',   
     'HTTP_X_FORWARDED',   
     'HTTP_FORWARDED',   
     'HTTP_CLIENT_IP',   
     'HTTP_FORWARDED_FOR_IP',   
     'VIA',   
     'X_FORWARDED_FOR',   
     'FORWARDED_FOR',   
     'X_FORWARDED',   
     'FORWARDED',   
     'CLIENT_IP',   
     'FORWARDED_FOR_IP',   
     'HTTP_PROXY_CONNECTION'   
        );
FOREACH($proxy_headers AS $x){
     IF (ISSET($_SERVER[$x])) DIE("You are using a proxy.");
        EXIT;
}
 
?>