mr4torr/letsencrypt_2017.md

## letsencrypt_2017.md

      
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              letsencrypt_2017.md
            
          
    How to setup Let's Encrypt for Nginx on Ubuntu 16.04 (including IPv6, HTTP/2 and A+ SLL rating)

There are two main modes to run the Let's Encrypt client (called Certbot):

Standalone: replaces the webserver to respond to ACME challenges
Webroot: needs your webserver to serve challenges from a known folder.

Webroot is better because it doesn't need to replace Nginx (to bind to port 80).
In the following, we're setting up mydomain.com.
HTML is served from /var/www/mydomain, and challenges are served from /var/www/letsencrypt.

Nginx snippets

First we create two snippets (to avoid duplicating code in every virtual host configuration).
Create a file /etc/nginx/snippets/letsencrypt.conf containing:
location ^~ /.well-known/acme-challenge/ {
	default_type "text/plain";
	root /var/www/letsencrypt;
}

Create a file /etc/nginx/snippets/ssl.conf containing:
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off;

ssl_protocols TLSv1.2;
ssl_ciphers EECDH+AESGCM:EECDH+AES;
ssl_ecdh_curve secp384r1;
ssl_prefer_server_ciphers on;

ssl_stapling on;
ssl_stapling_verify on;

add_header Strict-Transport-Security "max-age=15768000; includeSubdomains; preload";
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;

Create the folder for the challenges:
sudo mkdir -p /var/www/letsencrypt/.well-known/acme-challenge


Nginx virtual hosts (HTTP-only)

We don't have a certificate yet at this point, so the domain will be served only as HTTP.
Create a file /etc/nginx/sites-available/mydomain.conf containing:
server {
	listen 80 default_server;
	listen [::]:80 default_server ipv6only=on;
	server_name mydomain.com www.mydomain.com;

	include /etc/nginx/snippets/letsencrypt.conf;

	root /var/www/mydomain;
	index index.html;
	location / {
		try_files $uri $uri/ =404;
	}
}

Enable the site:
rm /etc/nginx/sites-enabled/default
ln -s /etc/nginx/sites-available/mydomain.conf /etc/nginx/sites-enabled/mydomain.conf

And reload Nginx:
sudo systemctl reload nginx


Certbot

Install the package:
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install certbot

Note: there is also a letsencrypt package in APT, but it's a much older version of the client.

Get the certificate

Request the certificate (don't forget to replace with your own email address):
certbot certonly --webroot --agree-tos --no-eff-email --email YOUR@EMAIL.COM -w /var/www/letsencrypt -d www.domain.com -d domain.com

It will save the files in /etc/letsencrypt/live/www.mydomain.com/.
Note: The flag --no-eff-email opts out of signing up for the EFF mailing list, remove the flag if you'd like to signup.

Nginx virtual hosts (HTTPS-only)

Now that you have a certificate for the domain, switch to HTTPS by editing the file /etc/nginx/sites-available/mydomain.conf and replacing contents with:
## http://mydomain.com redirects to https://mydomain.com
server {
	listen 80;
	listen [::]:80;
	server_name mydomain.com;

	include /etc/nginx/snippets/letsencrypt.conf;

	location / {
		return 301 https://mydomain.com$request_uri;
	}
}

## http://www.mydomain.com redirects to https://www.mydomain.com
server {
	listen 80 default_server;
	listen [::]:80 default_server ipv6only=on;
	server_name www.mydomain.com;

	include /etc/nginx/snippets/letsencrypt.conf;

	location / {
		return 301 https://www.mydomain.com$request_uri;
	}
}

## https://mydomain.com redirects to https://www.mydomain.com
server {
	listen 443 ssl http2;
	listen [::]:443 ssl http2;
	server_name mydomain.com;

	ssl_certificate /etc/letsencrypt/live/www.mydomain.com/fullchain.pem;
	ssl_certificate_key /etc/letsencrypt/live/www.mydomain.com/privkey.pem;
	ssl_trusted_certificate /etc/letsencrypt/live/www.mydomain.com/fullchain.pem;
	include /etc/nginx/snippets/ssl.conf;

	location / {
		return 301 https://www.mydomain.com$request_uri;
	}
}

## Serves https://www.mydomain.com
server {
	server_name www.mydomain.com;
	listen 443 ssl http2 default_server;
	listen [::]:443 ssl http2 default_server ipv6only=on;

	ssl_certificate /etc/letsencrypt/live/www.mydomain.com/fullchain.pem;
	ssl_certificate_key /etc/letsencrypt/live/www.mydomain.com/privkey.pem;
	ssl_trusted_certificate /etc/letsencrypt/live/www.mydomain.com/fullchain.pem;
	include /etc/nginx/snippets/ssl.conf;

	root /var/www/mydomain;
	index index.html;
	location / {
		try_files $uri $uri/ =404;
	}
}

Then reload Nginx:
sudo systemctl reload nginx

Note that http://mydomain.com redirects to https://mydomain.com (which redirects to https://www.mydomain.com)
because redirecting to https://www.mydomain.com directly would be incompatible with HSTS.

Automatic renewal using Cron

Certbot can renew all certificates that expire within 30 days, so let's make a cron for it.
You can test it has the right config by launching a dry run:
certbot renew --dry-run

Create a file /root/letsencrypt.sh:
#!/bin/bash
systemctl reload nginx

# If you have other services that use the certificates:
# systemctl restart mosquitto

Make it executable:
chmod +x /root/letsencrypt.sh

Edit cron:
sudo crontab -e

And add the line:
20 3 * * * certbot renew --noninteractive --renew-hook /root/letsencrypt.sh


Conclusion

Congratulations, you should now be able to see your website at https://www.mydomain.com 🙂
You can now also test that your domain has A+ SLL rating:

https://www.ssllabs.com/ssltest/analyze.html?d=mydomain.com
https://www.ssllabs.com/ssltest/analyze.html?d=www.mydomain.com

I would also recommend setting up content-specific features like Content Security Policy and Subresource Integrity:

Mozilla Observatory: submit a domain to get content-specific advices
Mozilla Security Guidelines

If Let's Encrypt is useful to you, consider donating to Let's Encrypt or donating to the EFF.