Is there any way of changing current user in PHP (Ubuntu)? [closed]

Question

Recently I've been looking for a PHP/Linux shell script that would change current working user from "www-data" to the other one.

Since I tried running this service: http://cfgfactory.com/images/servers_hire.png which is basically starting a "call of duty 4" server it worked all fine since I realized there's a bug in the call of duty 4 server that let's you download ANY file from the server I tried downloading ../../../var/www/config.php and that worked just fine... So I setup a new user for this service and that's why I need a way of changing user

That's how I start the server:

function start_cod4($mod,$port,$id){


    $cod4_dir = '/home/bartz/cod4/';
    if(getcwd() != $cod4_dir){
            chdir($cod4_dir);   
    }

    $run = array(
    'sv_hostname' => 'Hire & Play No.'.$id.' by ^1CFG^7Factory.com/host/ - Free game server hiring !',
    'rcon_password' => substr(md5(uniqid()),0,5),
    'g_password' => 'war'.substr(md5(uniqid()),0,3)
    );

    exec('nohup ./cod4_lnxded +set s_num='.$id.' +set net_port '.$port.' +set dedicated 2 +set fs_game mods/'.$mod.' +set sv_punkbuster 1 +set sv_hostname "'.$run['sv_hostname'].'" +set rcon_password "'.$run['rcon_password'].'" +set g_password "'.$run['g_password'].'" +set promod_mode match_mr10 +set g_gametype sd +map '.random_map().' > /dev/null 2>&1 &');
    return $run;

}

So basically I need a PHP or either SH script that would change current working user to another.

Thanks in advance !

Answer 1

Install sudo, and configure it to allow you to run the command as the user without a password.