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Snippet Name: Ban Proxy Servers

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

Also see:
» Censor Message Text
» Vulnerability Tester
» Block IP Addresses
» Bad Word Filter
» Anti-Flood Protection
» Anti-SQL Injection Function
» XSS Sanitizer Function
» Filter non-alphanumeric characters

Comment: (none)

Language: PHP
Highlight Mode: PHP
Last Modified: March 16th, 2009

<?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;
}
 
?>


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