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OpenVPN Traffic Leak Blocker on Linux

Open a terminal. First of all, you must obtain superuser rights:

Using Ubuntu Linux as an example:

  [email protected]:~$ sudo bash
  [sudo] password for user:
  [email protected]:/home/user# id
  uid=0(root) gid=0(root) groups=0(root)
  [email protected]:/home/user#

For example, Fedora Linux:

  [[email protected] ~]$ su
  [[email protected] user]# id
  uid=0(root) gid=0(root) groups=0(root)
  [[email protected] user]#

Download scripts using your browser:
and save them in the "Downloads" (wget, curl, etc. will not work, due to Anti-DDoS tools on the service website):

  [email protected]:/home/user# cd Downloads/
  [email protected]:/home/user/Downloads# ls -la
  total 20
  drwxr-xr-x 2 user user 4096 May 26 02:09 .
  drwxr-xr-x 17 user user 4096 May 26 02:08 ..
  -rw-rw-r-- 1 user user 210 May 26 02:09 deactivate_vpn_firewall
  -rw-rw-r-- 1 user user 6370 May 26 02:08 vpnfirewall
  [email protected]:/home/user/Downloads#

Change the owner of the scripts to "root", enable their execution and transfer to /usr/bin:

  [email protected]:/home/user/Downloads# chown root:root vpnfirewall
  [email protected]:/home/user/Downloads# chown root:root deactivate_vpn_firewall
  [email protected]:/home/user/Downloads# chmod 0755 vpnfirewall
  [email protected]:/home/user/Downloads# chmod 0755 deactivate_vpn_firewall
  [email protected]:/home/user/Downloads# mv vpnfirewall /usr/bin/
  [email protected]:/home/user/Downloads# mv deactivate_vpn_firewall /usr/bin/

Now, you can activate the traffic leak blocking script with the "vpnfirewall" command. Run the command with superuser privileges:

  [email protected]:/home/user/Downloads# vpnfirewall
  OK: Loading VPN firewall...
  OK: The firewall should not show any messages,
  OK: besides output beginning with prefix OK:...
  OK: VPN firewall loaded.
  [email protected]:/home/user/Downloads#

After applying the new iptables rules set by the script, connections will be allowed only to VPN servers of the MultiVPN service. All other connections will be blocked:

  [email protected]:/home/user/Downloads# ping
  PING ( 56(84) bytes of data.
  From icmp_seq=1 Packet filtered
  ping: sendmsg: Operation not permitted
  --- ping statistics ---
  1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms
  [email protected]:/home/user/Downloads# wget
  --2020-05-26 02:19:20--
  Connecting to failed: No route to host.
  [email protected]:/home/user/Downloads#

Now, you can connect to the VPN server. In the event of a disconnection, switching between servers, etc. the script will block traffic leaks.

If you need to allow Internet connections again without using a VPN, run the "deactivate_vpn_firewall" command with superuser privileges:

  [email protected]:/home/user/Downloads# deactivate_vpn_firewall
  + iptables -F
  + iptables -X
  + iptables -t nat -F
  + iptables -t nat -X
  + iptables -t mangle -F
  + iptables -t mangle -X
  + iptables -P INPUT ACCEPT
  + iptables -P OUTPUT ACCEPT
  + iptables -P FORWARD ACCEPT
  + exit 0
  [email protected]:/home/user/Downloads#

Deactivating traffic leakage blocking was successful. Internet access restored:

  [email protected]:/home/user/Downloads# ping
  PING ( 56(84) bytes of data.
  64 bytes from icmp_seq=1 ttl=63 time=61.3 ms
  --- ping statistics ---
  1 packets transmitted, 1 received, 0% packet loss, time 0ms
  rtt min/avg/max/mdev = 61.307/61.307/61.307/0.000 ms
  [email protected]:/home/user/Downloads#

Add the script to autorun if you want to block traffic without a VPN connection, immediately after loading the operating system.

For Ubuntu Linux, you need to run the following commands with superuser privileges:

  [email protected]:/home/user/Downloads# cd /etc/init.d/
  [email protected]:/etc/init.d# wget https://raw.githubusercontent.com/piratelinux/VPN-Firewall/master/etc/init.d/vpnfirewall
  --2020-05-26 02:25:07-- https://raw.githubusercontent.com/piratelinux/VPN-Firewall/master/etc/init.d/vpnfirewall
  Resolving raw.githubusercontent.com (raw.githubusercontent.com)...
  Connecting to raw.githubusercontent.com (raw.githubusercontent.com)||:443... connected.
  HTTP request sent, awaiting response... 200 OK
  Length: 2699 (2,6K) [text/plain]
  Saving to: ‘vpnfirewall’
  vpnfirewall 100%[=====================>] 2,64K --.-KB/s in 0,01s
  2020-05-26 02:25:09 (226 KB/s) - ‘vpnfirewall’ saved [2699/2699]
  [email protected]:/etc/init.d# chmod 0755 vpnfirewall
  [email protected]:/etc/init.d# update-rc.d vpnfirewall defaults
  [email protected]:/etc/init.d#

For Fedora Linux, add vpnfirewall to the crontab scheduler with the command:

  echo '@reboot root /usr/bin/vpnfirewall' >> /etc/crontab

Now, after loading the operating system, blocking traffic leaks will be applied automatically.

The proposed scripts have been successfully tested on operating systems: Debian 10, Ubuntu 20, and Fedora 32.

Based on materials from the GitHub project: https://github.com/piratelinux/VPN-Firewall

Linux instructions