This plugin generates a single SAN SSL Certificate with all domains in a WordPress network from CLI using Let's Encrypt.

Network subdomains and domains from WordPress MU Domain Mapping can be optionally included (see Create the certificate).

This plugin does NOT provide a web interface like WP Encrypt does, for many reasons :

• wp-encrypt does that just fine, but :
• giving write access to your SSL certificates from web is NOT recommended
• generating a large SAN (100+ domains) from web may not work (timeout)
• after generating your SAN certificate you need to reload your web server, this can't/shouldn't be done from web
• CLI is required to setup and renew your SSL certificate, so why not using it for generating it ?

WARNING : If you have any existing SSL Let's encrypt certificate on your server, this plugin will remove them ! If you plan to use multiple Let's encrypt certificates on your server, we recommend NOT to use this plugin for now.

• Certbot (Let's Encrypt client)

cd /usr/local/bin/
wget https://dl.eff.org/certbot-auto
chmod a+x certbot-auto
certbot-auto register --agree-tos

• WP CLI

cd /usr/local/bin/
wget -O wp https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
chmod a+x wp

• Download wp-cli-letsencrypt to wp-content/plugins
• Enable plugin for network

For Let's Encrypt to deliver your certificate, you need to setup a challenge URL in your web server : Add the following location block to your nginx vhost (nano /etc/nginx/sites-enabled/yourdomain) :

server {
  ...
  # allow let's encrypt acme challenge
  location ^~ /.well-known/acme-challenge/ {
    allow all;
  }
  ...
}

And reload nginx (service nginx reload)

The following command has to be executed once after install and each time after creating a new website on your WP network, in order to create or update your SAN SSL certificate :

cd /path/to/website && wp --allow-root letsencrypt && service nginx reload

By default the certificate won't include network subdomains and domains from wp_domain_mapping. Run the help command if you want to list available options :

cd /path/to/website && wp --allow-root help letsencrypt

Add this command line to your crontab (crontab -e) :

0 0 * * * /usr/local/bin/certbot-auto renew --post-hook "service nginx reload"

Each day at midnight Certbot will check, renew your certificate and restart nginx ONLY if needed (~ each 3 month).

Add the SSL directives to your nginx vhost (nano /etc/nginx/sites-enabled/yourdomain) :

server {
  listen 80;
  listen 443 ssl;
  ssl_certificate /etc/letsencrypt/live/yourdomain/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/yourdomain/privkey.pem;
  ...
}

And reload nginx (service nginx reload)

That's it ! Now to switch all your websites to HTTPS, you have to change the blog URL in WordPress and your theme, or just use a plugin like Really Simple SSL that will do the job for you.

You can also follow tutorials to optimize you ssl config.