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Automation for the acme-tiny

acme-tiny is great tool to work with Let's Encrypt. I like it. I use it.

I presume that you already had read acme-tiny documentation. It's required for proper usage.

There is one big Makefile to generate domain private keys, CSRs, download intermediate certificates and call acme-tiny with proper options to finally sign the certificates.

It runs well from unprivileged user. I create special user acme for it.

Also there is sample configuration files and virtual host template for Apache2.

Folder structure convention

  • /var/www/acme: homedir of user acme (recommended mode is 0700)
    • /var/www/acme/Makefile: piece of magic ;)
    • /var/www/acme/account_key.pem: your Let's Encrypt account key
    • /var/www/acme/domains.mk: list of domains to serve
    • /var/www/acme/example.com: folder for domain-specific data (here example.com)
      • /var/www/acme/example.com/private_key.pem: domain's private key
      • /var/www/acme/example.com/certificate.pem: domain's signed certificate
  • /var/www/acme-challenge: folder to put challenge files; must be writable for acme user

How to use it

Prerequisites:

  • you have web server, like Apache2;
  • you have domain, like example.com;
  • your web server have real IP.
  1. Create user acme with homedir /var/www/acme
useradd -b /var/www -m -s /bin/bash acme
chmod 0700 /var/www/acme
  1. Create folder /var/www/acme-challenge, writable to user acme
mkdir /var/www/acme-challenge
chmod 0775 /var/www/acme-challenge
chgrp acme /var/www/acme-challenge
  1. Put Makefile (and probably other files) to /var/www/acme
su acme -c "cd; wget https://raw.githubusercontent.com/kastaneda/acme/master/Makefile"

# or, if you prefer to clone this Git repo:
su acme -c "cd; git init .; git remote add -t \* -f origin https://github.com/kastaneda/acme.git; git checkout master"
  1. Configure web server (see apache2/acme-challenge.conf)
  2. Create and edit domains.mk (see domains.mk-example)
  3. Finally, as user acme, at homedir, run make:
su acme -c "cd; make"

Note: to use new certificates, you should reload your webserver.

Certificate expiration

Let's Encrypt certificates should be updated frequently.

There is special target make expire, it it finds certificates older than 30 days and put their timestamp to far past. Such certificates would be renewed on next make run.

Multiple webservers

TODO, FIXME: things become much more complicated if you have more than one web server.

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule (.*) - [L]
RewriteRule (.*) http://your-acme-host/.well-known/acme-challenge/$1 [L]