Let's Encrypt

Service letsencrypt description

Sample pillars

Installation

There are 3 installation methods available:

• package (default for Debian)

  For Debian Jessie, you need to use jessie-backports repository. For Ubuntu, use Launchpad PPA providing certbot package. You can use linux formula to manage these APT sources.

  letsencrypt:
    client:
      source:
        engine: pkg

  If the certbot package doesn't include Systemd .service and .timer files, you can set them to be installed by this formula by supplying install_units: True and cli.

  letsencrypt:
    client:
      source:
        engine: pkg
        cli: /usr/bin/certbot
        install_units: true

• URL to certbot-auto (default)

  This is default installation method for systems with no available certbot package.

  letsencrypt:
    client:
      source:
        engine: url
        url: "https://dl.eff.org/certbot-auto"

• Docker container

  Alternate installation method where Docker image is used to provide certbot tool and executed using wrapper script.

  letsencrypt:
    client:
      source:
        engine: docker
        image: "deliverous/certbot"

Usage

Default authentication method using standalone server on specified port. But this won't work without configuration of apache/nginx (read on) unless you don't have webserver running so you can select port 80 or 443.

letsencrypt:
  client:
    email: root@dummy.org
    auth:
      method: standalone
      type: http-01
      port: 9999
    domain:
      dummy.org:
        enabled: true
      www.dummy.org:
        enabled: true
      # Following will produce multidomain certificate:
      site.dummy.org:
        enabled: true
        names:
          - dummy.org
          - www.dummy.org

However ACME server always visits port 80 (or 443) where most likely Apache or Nginx is listening. This means that you need to configure /.well-known/acme-challenge/ to proxy requests on localhost:9999. For example, ensure you have following configuration for Apache:

ProxyPass "/.well-known/acme-challenge/" "http://127.0.0.1:9999/.well-known/acme-challenge/" retry=1
ProxyPassReverse "/.well-known/acme-challenge/" "http://127.0.0.1:9999/.well-known/acme-challenge/"

<Location "/.well-known/acme-challenge/">
  ProxyPreserveHost On
  Order allow,deny
  Allow from all
  Require all granted
</Location>

You can also use apache or nginx auth methods and let certbot do what's needed, this should be the simplest option.

letsencrypt:
  client:
    auth: apache

Alternatively you can use webroot authentication (using eg. existing apache installation serving directory for all sites):

letsencrypt:
  client:
    auth:
      method: webroot
      path: /var/www/html
      port: 80
    domain:
      dummy.org:
        enabled: true
      www.dummy.org:
        enabled: true

It's also possible to override auth method or other options only for single domain:

letsencrypt:
  client:
    email: root@dummy.org
    auth:
      method: standalone
      type: http-01
      port: 9999
    domain:
      dummy.org:
        enabled: true
        auth:
          method: webroot
          path: /var/www/html/dummy.org
          port: 80
      www.dummy.org:
        enabled: true

You are able to use multidomain certificates:

letsencrypt:
  client:
    email: sylvain@home
    staging: true
    auth:
      method: apache
    domain:
      keynotdomain:
        enabled: true
        name: ls.opensource-expert.com
        names:
        - www.ls.opensource-expert.com
        - vim22.opensource-expert.com
        - www.vim22.opensource-expert.com
      rm.opensource-expert.com:
        enabled: true
        names:
        - www.rm.opensource-expert.com
      vim7.opensource-expert.com:
        enabled: true
        names:
        - www.vim7.opensource-expert.com
      vim88.opensource-expert.com:
        enabled: true
        names:
        - www.vim88.opensource-expert.com
        - awk.opensource-expert.com
        - www.awk.opensource-expert.com

Legacy configuration

Common metadata:

letsencrypt:
  client:
    enabled: true
    config: |
      host = https://acme-v01.api.letsencrypt.org/directory
      email = webmaster@example.com
      authenticator = webroot
      webroot-path = /var/lib/www
      agree-tos = True
      renew-by-default = True
    domainset:
      www:
        - example.com
        - www.example.com
      mail:
        - imap.example.com
        - smtp.example.com
        - mail.example.com
      intranet:
        - intranet.example.com

Example of authentication via another port without stopping nginx server:

location /.well-known/acme-challenge/ {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://{{ site.host.name }}:9999/.well-known/acme-challenge/;
}

letsencrypt:
  client:
    enabled: true
    config: |
      ...
      renew-by-default = True
      http-01-port = 9999
      standalone-supported-challenges = http-01
    domainset:
      www:
        - example.com

Read more

• Certbot authentication plugins

Documentation and Bugs

To learn how to install and update salt-formulas, consult the documentation available online at:

http://salt-formulas.readthedocs.io/

In the unfortunate event that bugs are discovered, they should be reported to the appropriate issue tracker. Use Github issue tracker for specific salt formula:

https://github.com/salt-formulas/salt-formula-letsencrypt/issues

For feature requests, bug reports or blueprints affecting entire ecosystem, use Launchpad salt-formulas project:

https://launchpad.net/salt-formulas

You can also join salt-formulas-users team and subscribe to mailing list:

https://launchpad.net/~salt-formulas-users

Developers wishing to work on the salt-formulas projects should always base their work on master branch and submit pull request against specific formula.

https://github.com/salt-formulas/salt-formula-letsencrypt

Any questions or feedback is always welcome so feel free to join our IRC channel:

#salt-formulas @ irc.freenode.net