AWS has an awesome firewall built into its core services which can easily be used to make sure that only certain ports are open to the outside world. One extra step that we can take is to run a VPN Server that serves as the gateway to our protected EC2 instances. We can then shutdown direct SSH access to our EC2 instances and also have the freedom to block access to our entire network just by revoking access via our VPN Server. The later is very useful if you need to revoke access for a former employee. The following tutorial will take you through the steps of setting up an EC2 instance that will run the OpenVPN Server. It will then cover how to grant and revoke access through the VPN Server. Step 1— Create the VPN Security Group Overview: security groups allow your servers to communicate with each other in a private cloud while exposing specific ports to the world. We are going to create a security group to allow VPN access to our VPN Server. We will assume that all your other EC2 instances are members of the default security group and that the default security group does not allow access from the outside world. Log in at , type EC2 in the search box and click on the target to go to the EC2 Dashboard. https://aws.amazon.com From the EC2 dashboard, click Security Groups Click Create Security Group Enter a name and description of and specify inbound rules on ports 22, 443, 943 and 1194. Note: the protocol for port 1194 is UDP. vpn Note: if the IP addresses that your team uses are static then you can add yet another layer of security by specifying that IP address range in the of your rules. However, you’ll want to leave the blank if you want your team to be able to connect from different IPs as they may be working from a hotel, home, cafe, etc… Source Source Step 2 — Create the EC2 Instance Return to the EC2 Dashboard and then click Launch Instance Select Ubuntu (you can of course select almost any other OS that runs OpenVPN, but this tutorial is tailored for Ubuntu) Select and click t2.nano Review and Launch On the next screen, click Edit security groups Select the and security groups and click vpn default Review and Launch Click choose your key pair and then click Launch, Launch Instances Step 3 — Disable Source/Destination Check From the list of instances, select the VPN instance and then from the drop down menu. Then click . This is needed as otherwise, your VPN server will not be able to connect to your other EC2 instances. Networking->Change Source/Dest. Check Yes, Disable Step 4— Create an Elastic IP Address Overview: when an EC2 instance is stopped and restarted, the Public IP address changes. We want the IP address of our VPN Server to remain static so we’ll use an Elastic IP Address. From the E2c Dashboard, select Elastic IPs Click Allocate new address Click and then Allocate Close. Make a note of your Elastic IP address as this will be the Public IP Address of your VPN Server. Then select the Elastic IP and click from the drop down menu. Associate address Select the EC2 instance you just created and click . Associate Step 5— Install and Configure the OpenVPN Server SSH into your VPN server: $ ssh ubuntu@PUBLIC-IP-OF-VPN-SERVER Download our helper scripts and set up a default config: $ git clone $ cd $ cp config-default.sh config.sh https://github.com/redgeoff/openvpn-server-vagrant openvpn-server-vagrant Edit config.sh and enter in your configuration. Note: PUBLIC_IP should be equal to the Elastic IP Address that you created above. $ nano config.sh Switch to root $ sudo su - Update Ubuntu and install OpenVPN. Note: you will be prompted twice and when you do, select Keep the local version currently installed $ /home/ubuntu/openvpn-server-vagrant/ubuntu.sh$ /home/ubuntu/openvpn-server-vagrant/openvpn.sh At this point, the OpenVPN Server is running. Step 6 — Add the Route Routes must be added to the server so that your team’s clients know which traffic to route to the VPN Server. You can determine the proper subnet by returning to your list of EC2 instances, clicking on a target instance and identifying the Private IP. Your network will be the first 2 parts of the Private IP appended with zeros, e.g. 172.31.0.0 On the VPN Server edit and add something like the following: /etc/openvpn/server.conf push "route 172.31.0.0 255.255.0.0" Then restart the VPN Server with: $ systemctl restart openvpn@server Step 7— Grant Access to Your VPN Note: We assume that you are still SSH’d into the VPN and logged in as root. Run the following command and be sure to replace below with a unique name for your user/client. client $ /home/ubuntu/openvpn-server-vagrant/add-client.sh client You’ll then find a configuration file at ~/client-configs/files/client-name.ovpn You will want to provide this file to the individual on your team who will be connecting to your VPN. SCP is handy for downloading this .ovpn file from your VPN Server. Your team can use one of various VPN clients such as (OS X) and (Linux, iOS, Android and Windows). After installing one of these clients they should be able to set up the VPN config just by double clicking on the .ovpn file. Tunnelblick OpenVPN Note: once connected to the VPN, your users will want to use the Private IPs of your EC2 instances. You’ll probably want to use Route 53 to create subdomain records that route to the Private IPs. Step 8— Revoke Access to Your VPN Note: We assume that you are still SSH’d into the VPN and logged in as root. Run the following command and be sure to replace below with a unique name for your user/client. client $ /home/ubuntu/openvpn-server-vagrant/revoke-full.sh client Troubleshooting If your VPN client reports a error then this is most likely because your VPN security group (Step 1) is incorrect. Make sure that you have the correct ports and protocols specified — a common problem is not specifying UDP for port 1194. TLS handshake failed About the Author Geoff Cox is the creator of , a new declarative programming language that allows you to create apps in JSON. He’s been self-employed for the greater part of the last 15 years and loves taking on ambitious, yet wife-maddening, projects like and . You can reach him or at . MSON creating a database distributed data syncing system @redgeoff7 github

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