Configuring Lets Encrypt SSL certificate with OpenVPN

Quote from moshe on 18/10/2021, 10:44 am

Problem

User wants to install free SSL certificate from letencrypt on openvpn server available from: https://openvpn.net/download-open-vpn/

Note: the solution requires adding a TXT record to your domain ( make sure you have access to your DNS )

Solution

run the following steps and commands in order to generate and install your certificate

download and install certbot ( also can be installed on your AMI openvpn server )

add-apt-repository ppa:certbot/certbot
apt-get update
apt install certbot

generate a certificate

certbot certonly –manual –preferred-challenges dns -d “vpn.tracston.ai”

when prompted with this information

_acme-challenge.vpn.tracston.ai with the following value:

uHSfsIqCtDdlYUK_3XNFQhsmh98wu6Lh4vN-6GoYl0I

add the TXT record to your DNS

when creating DNS record dont add the entire domain just the prefix _acme-challenge.vpn

and lower TTL to 1 min

wait 5 minutes and press enter if you added the records correctly you will be prompted that certificates has been generated

run the following commands to import the SSL certificates

DOMAIN=production-vpn.tracston.ai
/usr/local/openvpn_as/scripts/confdba -mk cs.ca_bundle -v “`cat /etc/letsencrypt/live/$DOMAIN/fullchain.pem`”
/usr/local/openvpn_as/scripts/confdba -mk cs.priv_key -v “`cat /etc/letsencrypt/live/$DOMAIN/privkey.pem`” > /dev/null
/usr/local/openvpn_as/scripts/confdba -mk cs.cert -v “`cat /etc/letsencrypt/live/$DOMAIN/cert.pem`”

Restart OpenVPN Server
/usr/local/openvpn_as/scripts/sacli start