Openvpn Easy-rsa Generate Client Key

Posted on 12.12.2020 by admin

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It is possible to generate your certificates on the router itself if you don't have access to a Linux machine, or if you don't have a Windows client installed with Easy-RSA. Easy-RSA is a simple to use environment that is bundled with OpenVPN, and has been included in Asuswrt-Merlin.

This guide covers how to create certificates and keys for OpenVPN server and clients using the EasyRSA tool on MacOS. The instructions are very similar for most flavours of linux such as Ubuntu once the correct packages are installed (e.g. On Ubuntu: apt-get install openvpn easy-rsa). Enhanced version of Asus's router firmware (Asuswrt) (legacy code base) - RMerl/asuswrt-merlin. Generating OpenVPN keys using Easy RSA. Jump to bottom.

Setting up the environment

The first step is to initialize your work environment. Ideally this should be done on a USB disk (formatted to ext2, ext3 or ext4 (for ARM-based devices)), but it can be done in /tmp (make sure you DO keep a copy of everything generated there, because it will be lost the next time you reboot the router!). For this example, we will be using a USB disk mounted under /mnt/sda1. First, copy the easy-rsa scripts by running the following command:

setuprsa.sh /mnt/sda1

This will create an easy-rsa folder on your USB disk, and copy all the required scripts there. Then, enter that new directory:

cd /mnt/sda1/easy-rsa

Now step you will probably want to change the default values offered while generating the certificates. Edit the file named 'vars', either through the built-in 'vi' editor (not recommended for novice users), or by installing the 'nano' editor using Optware, or simply by copying the file edited on your computer. The only fields you might want to change are these:

export KEY_COUNTRY='US'
export KEY_PROVINCE='CA'
export KEY_CITY='SanFrancisco'
export KEY_ORG='Fort-Funston'
export KEY_EMAIL='me@myhost.mydomain'
export KEY_EMAIL=mail@host.domain
export KEY_CN=changeme
export KEY_NAME=changeme
export KEY_OU=changeme

You can also adjust the expiration date for keys if desired. I do not recommend changing the expiration date for the CA, neither the key size - increasing from 1024 bytes will have a performance impact.

Once done, setup the environment by running the script this way:

source ./vars

There, initialize the environment:

./clean-all

Your environment is now ready to be used to generate your certificates.

Generate Openvpn Keys

Generating the certificates

First, you need to generate your Certificate Authority (CA). This will be the 'master' key and certificate, which will be used to sign all client certificates, or revoke their access. Make sure you store this in a safe, secure location (preferably NOT on the router itself!). To generate the CA pair:

./build-ca

The Common Name (CN) is the most important field, as it will be what identifies your router.

Now, we need to build a router key/certificate pair: /which-tag-specifies-a-key-pair-generator-field-in-a-form.html.

./build-key-server server1

Gta 5 beta pc key generator. Use any name you want instead of 'server1', but make sure that when asked for the Common Name that you enter the exact same name. When asked to sign and to commit the new certificate, answer 'y' to both questions.

Next, let's build one client key/certificate pair. Same procedure (and once again pay attention to the Common Name, which must match the name you are specifying here instead of client1):

Program Files Openvpn Easy Rsa

./build-key client1

You can create as many client keypairs as you need. The CA file will be what determines which keys are allowed to connect.

One last thing - we need to generate the Diffie Hellman parameters (DH file), which is used to secure the key exchange between client and router. Run the following command:

./build-dh