Let's Encrypt for Ubiquiti UbiOS firmwares

Overview

This should work on UbiOS based firmware versions 1.7.0 onwards. This includes:

• UniFi Dream Machine
• UniFi Dream Machine Pro

This script supports issuing LetsEncrypt certificates via DNS using Lego.

Out of the box, it has support for AWS Route53 and Cloudflare DNS providers, and with a bit of work you could get it working with any of the supported Lego DNS Providers.

Installation

1. Copy the contents of this repo to your device at /mnt/data/udm-le.
2. Edit udm-le.env and tweak variables to meet your needs.
3. Run /mnt/data/udm-le/udm-le.sh initial. This will handle your initial certificate generation and setup a cron task at /etc/cron.d/udm-le to attempt certificate renewal each morning at 0300.

Persistance

On firmware updates, the cron file (/etc/cron.d/udm-le) gets removed, so if you'd like for this to persist between upgrades, I suggest so you install boostchicken's on-boot-script package.

This script is setup such that if it determines that on-boot-script is enabled, it will set up an additional script at /mnt/data/on_boot.d/99-udm-le.sh which will attempt certificate renewal shortly after a reboot (and subsequently set the cron back up again).

DNS Providers

AWS Route53

AWS Route53 DNS challenge can use configuration and authentication values easily through shared credentials and configuration files as described here. This script will check for and include these files during the initial certificate generation and subsequent renewals. Ensure that route53 is set for DNS_PROVIDER in udm-le.env, create a new directory called .aws in /mnt/data/udm-le and add credentials and config files as required for your authentication. See the AWS CLI Documentation for more information. Currently only the default profile is supported.

Cloudflare

In your Cloudflare account settings, create an API token with the following permissions:

• Zone > Zone > Read
• Zone > DNS > Edit

Once you have your token generated, add the value to udm-le.env.