nginx https only

Install nginx webserver with following configurations:

• http to https redirect
• strong crypto settings
• automatic SSL certificates from let's encrypt.

The script dehydrated used by this role. This script is working with your private keys so be careful and review the code. For more details take a look at the ansible dehydrated role.

Requirements

The role installs a nginx and some small packages from dependent role (e.g. openssl and git)

This role need for a appropriate usage an additional webserver configuration with specification of the served content, some examples are listed below.

Role Variables

Required Variables:

nginx_https_server_name

The domain for the ssl enabled site.

nginx_https_server_name: example.com

dehydrated_contactemail

Address for the letsencrypt account. Mostly for certificate expiration notices, but should be not happen if the cron job works fine.

dehydrated_contactemail: [email protected]

dehydrated_letsencrypt_agreed_terms

To accept the letsencrypt terms of service set the variable dehydrated_letsencrypt_agreed_terms to the current license url. You find the actual url at https://acme-v01.api.letsencrypt.org/terms.

dehydrated_letsencrypt_agreed_terms: https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf

Optional Variables:

nginx_https_ssl_protocols

This variable set the allowed ssl protokol versions. Default is for better compatibility TLSv1 TLSv1.1 TLSv1.2. For more secure setups use:

nginx_https_ssl_protocols: TLSv1.2

nginx_https_ssl_ciphers

Configure the ssl cipher suite, the default is the recomented cipher suite from bettercrypto.org, but with only Perfect Forward Secrecy (PFS). For better compatibility use one of the first suites, for more secure setups the last one.

bettercrypto.org

nginx_https_ssl_ciphers: EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA

bettercrypto.org (with 256bit non PFS ciphers)

nginx_https_ssl_ciphers: EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA256-SHA:AES256-SHA

bettercrypto.org (only PFS ciphers, the default)

nginx_https_ssl_ciphers: EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA

only TLSv1.2 AES256 ciphers

nginx_https_ssl_ciphers: EDH+aRSA+AES256:EECDH+aRSA+AES256:!SSLv3

nginx_https_strict_transport

Per default this role configure a https strict transport header with a three month duration. To change the duration set the following variable:

nginx_https_strict_transport : max-age=2592000 # 30 days

It is also posible the set additional attributes, like:

# one year, enforce for subdomains and allow HSTS preload
nginx_https_strict_transport : "max-age=31536000; includeSubDomains; preload"

More variables

There are also some unusual variables for super user who need more control, for details take look at defaults/main.yml

Dependencies

This role is designed to work with role martin-v.dehydrated.

Example Playbook

- hosts: all
  remote_user: root
  vars_files:
    - nginx_https_only.yml
  roles:
    - martin-v.nginx_https_only
    - martin-v.dehydrated

- hosts: all
  remote_user: root
  tasks:
  - name: Deploy nginx sslsite config
    template:
      src: templates/sslsite.conf.j2
      dest: /etc/nginx/sites-available/sslsite.conf
  - name: Enable nginx sslsite config
    file:
      src: /etc/nginx/sites-available/sslsite.conf
      dest: /etc/nginx/sites-enabled/sslsite.conf
      state: link

Example variables file

dehydrated_contactemail: [email protected]

dehydrated_letsencrypt_agreed_terms: https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf

nginx_https_server_name: example.com

Example sslsite.conf templates

Simple serve static contents from /var/www/html:

server {
        listen 443 ssl default_server;
        listen [::]:443 ssl default_server;

        server_name {{ nginx_https_server_name }};

        ssl_certificate /etc/nginx/ssl/{{ nginx_https_server_name }}/fullchain.pem;
        ssl_certificate_key /etc/nginx/ssl/{{ nginx_https_server_name }}/privkey.pem;
        ssl_trusted_certificate /etc/nginx/ssl/{{ nginx_https_server_name }}/fullchain.pem;

        root /var/www/html;

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

To support http2 simply add http2 to listen config line, e.g.:

        listen 443 ssl http2 default_server;
        listen [::]:443 ssl http2 default_server;

Work as https proxy for an application on localhost:8080:

server {
    listen 443 ssl default_server;
    listen [::]:443 ssl default_server;

    server_name {{ nginx_https_server_name }};

    ssl_certificate /etc/nginx/ssl/{{ nginx_https_server_name }}/fullchain.pem;
    ssl_certificate_key /etc/nginx/ssl/{{ nginx_https_server_name }}/privkey.pem;
    ssl_trusted_certificate /etc/nginx/ssl/{{ nginx_https_server_name }}/fullchain.pem;

    location / {
        proxy_set_header        Host $host;
        proxy_set_header        X-Real-IP $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header        X-Forwarded-Proto $scheme;

        proxy_pass          http://localhost:8080;
        proxy_redirect      http://localhost:8080 {{ nginx_https_server_name }};
        proxy_read_timeout  90;
    }

    # Optionally, require HTTP basic auth.
    # auth_basic "Please authenticate to use {{ nginx_https_server_name }}";
    # auth_basic_user_file /etc/nginx/passwdfile;
}

Open tasks

master

• Add etckeeper branch
• Implement safe usage of ssl_session_ticket_key and/or ssl_session_cache
  • Refresh key every day
• Consider mozillas server side TLS recomentations (config generator)
• Add more http security header

License

MIT

Author Information

This role was created in 2016 and improved in 2017 by Martin V..