Let's Encrypt Nginx setup with Ansible

Ansible Let's Encrypt Nginx setup

Ansible playbook to setup HTTPS using Let's encrypt on nginx.

The Ansible playbook installs everything needed to serve static files from a nginx server over HTTPS.
The server pass A rating on [SSL Labs](https://www.ssllabs.com/).

To use:
 1. Install [Ansible](https://www.ansible.com/)
 2. Setup an Ubuntu 16.04 server accessible over ssh
 3. Create `/etc/ansible/hosts` according to template below and change example.com to your domain
 4. Copy the rest of the files to an empty directory (`playbook.yml` in the root of that folder and the rest in the `templates` subfolder)
 5. Run `ansible-playbook playbook.yml`
 6. Copy your (static HTML) code to `/var/www/example.com` (`example.com` replaced with your domain)
 7. Restart nginx (`systemctl restart nginx`)

etc ansible hosts

[letsencrypt]
example.com ansible_user=root letsencrypt_email=me@example.com domain_name=example.com

playbook.yml

---
- hosts: letsencrypt
  become: true
  gather_facts: no

  pre_tasks:
    - raw: apt-get install -y python-simplejson

  tasks:
    - name: Upgrade system
      apt: upgrade=dist update_cache=yes

    - name: Install nginx
      apt: name=nginx state=latest

    - name: install letsencrypt
      apt: name=letsencrypt state=latest

    - name: create letsencrypt directory
      file: name=/var/www/letsencrypt state=directory

    - name: Remove default nginx config
      file: name=/etc/nginx/sites-enabled/default state=absent

    - name: Install system nginx config
      template:
        src: templates/nginx.conf.j2
        dest: /etc/nginx/nginx.conf

    - name: Install nginx site for letsencrypt requests
      template:
        src: templates/nginx-http.j2
        dest: /etc/nginx/sites-enabled/http

    - name: Reload nginx to activate letsencrypt site
      service: name=nginx state=restarted

    - name: Create letsencrypt certificate
      shell: letsencrypt certonly -n --webroot -w /var/www/letsencrypt -m {{ letsencrypt_email }} --agree-tos -d {{ domain_name }}
      args:
        creates: /etc/letsencrypt/live/{{ domain_name }}

    - name: Generate dhparams
      shell: openssl dhparam -out /etc/nginx/dhparams.pem 2048
      args:
        creates: /etc/nginx/dhparams.pem

    - name: Install nginx site for specified site
      template:
        src: templates/nginx-le.j2
        dest: /etc/nginx/sites-enabled/le

    - name: Reload nginx to activate specified site
      service: name=nginx state=restarted

    - name: Add letsencrypt cronjob for cert renewal
      cron:
        name: letsencrypt_renewal
        special_time: weekly
        job: letsencrypt --renew certonly -n --webroot -w /var/www/letsencrypt -m {{ letsencrypt_email }} --agree-tos -d {{ domain_name }} && service nginx reload

templates nginx-http.j2

server_tokens off;

server {
    listen 80 default_server;
    server_name {{ domain_name }};

    location /.well-known/acme-challenge {
        root /var/www/letsencrypt;
        try_files $uri $uri/ =404;
    }

    location / {
        rewrite ^ https://{{ domain_name }}$request_uri? permanent;
    }
}

templates nginx-le.j2

add_header X-Frame-Options SAMEORIGIN;
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";
add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://www.google-analytics.com; img-src 'self' data: https://www.google-analytics.com; style-src 'self' 'unsafe-inline'; font-src 'self'; frame-src 'none'; object-src 'none'";


# HTTPS server
#
server {
    listen 443 ssl default deferred;
    server_name {{ domain_name }};

    ssl on;
    ssl_certificate         /etc/letsencrypt/live/{{ domain_name }}/fullchain.pem;
    ssl_certificate_key     /etc/letsencrypt/live/{{ domain_name }}/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/{{ domain_name }}/fullchain.pem;

    ssl_session_cache shared:SSL:50m;
    ssl_session_timeout 5m;
    ssl_stapling on;
    ssl_stapling_verify on;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";

    ssl_dhparam /etc/nginx/dhparams.pem;
    ssl_prefer_server_ciphers on;

    root /var/www/{{ domain_name }};
    index index.html index.htm;

    location / {
        try_files $uri $uri/ =404;
    }
}

templates nginx.conf

user www-data;
worker_processes 4;
pid /run/nginx.pid;

events {
    worker_connections 768;
}

http {

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    gzip on;
    gzip_disable "msie6";

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}