certbot-dns-acmedns

ACME-DNS DNS Authenticator plugin for Certbot.

ACME-DNS is a simplified DNS server with a RESTful HTTP API to provide a simple way to automate ACME DNS challenges. Explaining details of ACME-DNS is not part of this repo, we assume you have running ACME-DNS server. To understand what ACME-DNS is and for details on how to run/use ACME-DNS server see ACME-DNS repo.

This plugin is built from the ground up and follows the development style and life-cycle of other certbot-dns-* plugins found in the individual directories of the Official Certbot Repository.

For general information about Certbot plugin development see Certbot developer documentation.

Installation

pip install --upgrade certbot
pip install certbot-dns-acmedns

Verify:

$ certbot plugins --text

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* certbot-dns-acmedns:dns-acmedns
Description: Obtain certificates using a DNS TXT record (if you are using
ACME-DNS for DNS.)
Interfaces: IAuthenticator, IPlugin
Entry point: dns-acmedns = certbot_dns_acmedns.dns_acmedns:Authenticator

...
...

Configuration

The (certbot) credentials file e.g. acmedns-credentials.ini should look like this:

# cat acmedns-credentials.ini
certbot_dns_acmedns:dns_acmedns_api_url = http://acmedns-server/
certbot_dns_acmedns:dns_acmedns_registration_file = /etc/certbot/acme-registration.json

This plugin does not do ACME-DNS registration and you are responsible to make sure /etc/certbot/acme-registration.json (in the example above) contains the registration data in the following format:

# cat /etc/certbot/acme-registration.json
{
  "something.acme.com": {
    "username": "6e14735c-2c6a-447e-b63d-a23ac4438bd7",
    "password": "dd6gnYS-IxrQfDLbdPRX3hrFhS_SLrwbS0kSl_i8",
    "fulldomain": "3b750a0e-c627-423f-9966-4799c6a9533b.auth.example.org",
    "subdomain": "3b750a0e-c627-423f-9966-4799c6a9533b",
    "allowfrom": []
  }
}

This format is the same as the one used in some other tools, e.g. cert-manager ACME-DNS plugin

Usage

certbot ... \
        --authenticator certbot-dns-acmedns:dns-acmedns  \
        --certbot-dns-acmedns:dns-acmedns-credentials /etc/certbot/acmedns-credentials.ini \
        certonly

FAQ

Why such long name for a plugin?

This follows the upstream nomenclature: certbot-dns-<dns-provider>.

Why do I have to use : separator in the name? And why are the configuration file parameters so weird?

This is a limitation of the Certbot interface towards third-party plugins.

For details read the discussions:

• https://github.com/certbot/certbot/issues/6504#issuecomment-473462138
• https://github.com/certbot/certbot/issues/6040
• https://github.com/certbot/certbot/issues/4351
• https://github.com/certbot/certbot/pull/6372

Development

Create a virtualenv, install the plugin (editable mode), spawn the environment and run the test:

Prepare the support environment:

docker-compose up -d

You can also omit -d if you wish to see backend server logs side-by-side with the client.

Run certbot client

docker build -t certbot_acmedns_client -f test/Dockerfile test/
docker run -it --rm --network certbot-dns-acmedns_default --dns "10.151.40.100" -v $PWD:/certbot-dns-acmedns certbot_acmedns_client sh -c 'pip3 install -e /certbot-dns-acmedns && /certbot-dns-acmedns/test/e2e_test.sh'

License

Apache License Version 2.0, January 2004

Authors

DT Pan-Net s.r.o