403 Forbidden

#!/usr/bin/perl
use strict;
use warnings;
use IO::File;
use Carp;

my $user;
my @whitelist_files = ( '/etc/kill_dbwhitelist', '/etc/killwhitelist' );
if (@ARGV) {
    $user = shift;
    foreach (@whitelist_files) {
        my $whitelist_lines = IO::File->new( $_, O_RDONLY );
        if ( !defined $whitelist_lines || !$whitelist_lines->opened() ) {
            carp("Error opening $_\n");
        }
        chomp( my @whitelist_lines = $whitelist_lines->getlines() );
        $whitelist_lines->close();
        my $match;
        my @converted_whitelist;
        foreach (@whitelist_lines) {
            if ( $_ =~ /^$user$/smx ) {
                next;
            }
            push( @converted_whitelist, $_ );
        }
        if (@converted_whitelist) {
            my $whitelist_lines = IO::File->new( $_, O_WRONLY | O_TRUNC );
            if ( !defined $whitelist_lines || !$whitelist_lines->opened() ) {
                carp("Error opening $_\n");
            }
            my $converted_whitelist = join( "\n", @converted_whitelist );
            $whitelist_lines->write("$converted_whitelist\n");
            $whitelist_lines->close();
        }
        elsif ( scalar @whitelist_lines == 1 ) {
            my $whitelist_lines = IO::File->new( $_, O_WRONLY | O_TRUNC );
            if ( !defined $whitelist_lines || !$whitelist_lines->opened() ) {
                carp("Error opening $_\n");
            }
            $whitelist_lines->close();
        }
    }
    my $shell = ( getpwuid( getpwnam($user) ) )[8];

    if ( $shell eq '/bin/bash' ) {
        system("chsh -s /usr/local/cpanel/bin/noshell $user");
    }
    system("sed -i '/userdirprotect/d' /var/cpanel/userdata/$user/*");
    system('/etc/cron.daily/reseller_pack_limits');
}