OpenVPN: Simple Server using Script

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sumber: https://www.cyberciti.biz/faq/howto-setup-openvpn-server-on-ubuntu-linux-14-04-or-16-04-lts/


Cek IP Publik Kita

Jika Server tersambung langsung ke Internet, dapat menggunakan 

ip addr show eth0
ip addr show enp0s3
ip a

atau menggunakan 

dig TXT +short o-o.myaddr.l.google.com @ns1.google.com
host myip.opendns.com resolver1.opendns.com

Download openvpn-install.sh script

Download 

wget https://git.io/vpn -O openvpn-install.sh
openvpn-install.sh

Install OpenVPN, run, 

sudo bash openvpn-install.sh

Setup Firewall

Kadang konfigurasi Firewall bisa di lihat di /etc/rc.local file: 

cat /etc/rc.local

Contoh Firewall: 

iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -I INPUT -p udp --dport 1194 -j ACCEPT
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to 139.59.1.155

Contoh konfigurasi Server openvpn, 

sudo more /etc/openvpn/server.conf
sudo vi /etc/openvpn/server.conf

Run / Control OpenVPN Server, 

sudo systemctl stop openvpn@server
sudo systemctl start openvpn@server
sudo systemctl restart openvpn@server

sudo /etc/init.d/openvpn stop
sudo /etc/init.d/openvpn start
sudo /etc/init.d/openvpn restart

ufw firewall rules (optional)

Edit /etc/ufw/before.rules, 

sudo vi /etc/ufw/before.rules

sudo ufw allow 1194/udp
sudo ufw allow 22/tcp

Edit /etc/ufw/sysctl.conf file, 

sudo vi /etc/ufw/sysctl.conf

net/ipv4/ip_forward=1

Enable / Reload ufw, 

sudo ufw enable

OR 

sudo ufw reload

Verify, 

sudo ufw status
sudo iptables -t nat -L -n -v
sudo iptables -L FORWARD -n -v
sudo iptables -L ufw-before-forward -n -v

Client configuration

On server your will find a client configuration file called ~/iphone.ovpn. All you have to do is copy this file to your local desktop using the scp and provide this file to your OpenVPN client to connect: 

$ scp vivek@139.59.1.155:~/iphone.ovpn .

Next, you need to download OpenVPN client as per your operating system: 

   Download OpenVPN client for Apple IOS version 6.x or above and install it.
   Download OpenVPN client for Android and install it.
   Download OpenVPN client for Apple MacOS (OS X) and install it.
   Download OpenVPN client for Windows 8/10 and install it.

MacOS/OS X OpenVPN client configuration

Just double click on iphone.ovpn file and it will open in your tunnelblick client > Click on the “Only me” to install it. Fig.03: MacOS / OS X openvpn client configuration Fig.03: MacOS / OS X openvpn client configuration

Once installed click on Connect button and you will be online. Use the following command on MacOS client to verify that your public IP changed to the VPN server IP: $ dig TXT +short o-o.myaddr.l.google.com @ns1.google.com

You can ping to OpenVPN server private IP: 

$ ping 10.8.0.1

Linux OpenVPN client configuration

First, install the openvpn client, enter: 

$ sudo yum install openvpn

OR 

$ sudo apt install openvpn

Next, copy iphone.ovpn as follows: 

$ sudo cp iphone.ovpn /etc/openvpn/client.conf

Test connectivity from the CLI: 

$ sudo openvpn --client --config /etc/openvpn/client.conf

Your Linux system will automatically connect when computer restart using /etc/init.d/openvpn script: 

$ sudo /etc/init.d/openvpn start

For systemd based system, use the following command: 

$ sudo systemctl start openvpn@client

Test the connectivity: 

$ ping 10.8.0.1 #Ping to OpenVPN server gateway
$ ip route #Make sure routing setup
$ dig TXT +short o-o.myaddr.l.google.com @ns1.google.com #Make sure your public IP set to OpenVPN server

FreeBSD OpenVPN client configuration

First, install the openvpn client, enter: 

$ sudo pkg install openvpn

Next, copy iphone.ovpn as follows: 

$ mkdir -p /usr/local/etc/openvpn/
$ sudo cp iphone.ovpn /usr/local/etc/openvpn/client.conf

Edit /etc/rc.conf and add the following: 

openvpn_enable="YES"
openvpn_configfile="/usr/local/etc/openvpn/client.conf"

Start the OpenVPN service: 

$ sudo /usr/local/etc/rc.d/openvpn start

Verify it: 

$ ping 10.8.0.1 #Ping to OpenVPN server gateway
$
$ netstat -nr #Make sure routing setup
$
$ drill myip.opendns.com @resolver1.opendns.com #Make sure your public IP set to OpenVPN server

How do I add a new client?

For demo purpose I added a new device called iphone. Let us add one more device called googlephone by running the script again: 

$ sudo bash openvpn-install.sh

Sample outputs:

Looks like OpenVPN is already installed

What do you want to do? 

  1) Add a cert for a new user
  2) Revoke existing user cert
  3) Remove OpenVPN
  4) Exit

Select an option [1-4]:


Referensi

Pranala Menarik

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