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netcup DNS Authenticator plugin for Certbot

Project description

netcup DNS Authenticator plugin for certbot.

This plugin automates the process of completing a dns-01 challenge by creating, and subsequently removing, TXT records using the netcup CCP API via lexicon.

Installation

pip install certbot-dns-netcup

Named Arguments

To start using DNS authentication for netcup, pass the following arguments on certbot’s command line:

  • --authenticator=certbot-dns-netcup:dns-netcup: select the authenticator plugin (Required)
  • --certbot-dns-netcup:dns-netcup-credentials=<FILE>: netcup credentials INI file. (Required)
  • --certbot-dns-netcup:dns-netcup-propagation-seconds=<SECONDS>: waiting time for DNS to propagate before asking the ACME server to verify the DNS record. (Default: 10, Recommended: >= 900)

You may need to set an even higher propagation time (>= 900 seconds) to give the netcup DNS time to propagate the entries! This may be annoying when calling certbot manually but should not be a problem in automated setups.

(Note that the verbose and seemingly redundant certbot-dns-netcup: prefix is currently imposed by certbot for external plugins.)

Credentials

Use of this plugin requires a configuration file containing netcup API credentials, obtained from your netcup account page. See also the CCP API documentation.

An example credentials.ini file:

certbot_dns_netcup:dns_netcup_customer_id  = 123456
certbot_dns_netcup:dns_netcup_api_key      = 0123456789abcdef0123456789abcdef01234567
certbot_dns_netcup:dns_netcup_api_password = abcdef0123456789abcdef01234567abcdef0123

The path to this file can be provided interactively or using the --certbot-dns-netcup:dns-netcup-credentials command-line argument. Certbot records the path to this file for use during renewal, but does not store the file’s contents.

CAUTION: You should protect these API credentials as you would the password to your netcup account. Users who can read this file can use these credentials to issue arbitrary API calls on your behalf. Users who can cause Certbot to run using these credentials can complete a dns-01 challenge to acquire new certificates or revoke existing certificates for associated domains, even if those domains aren’t being managed by this server.

Certbot will emit a warning if it detects that the credentials file can be accessed by other users on your system. The warning reads “Unsafe permissions on credentials configuration file”, followed by the path to the credentials file. This warning will be emitted each time Certbot uses the credentials file, including for renewal, and cannot be silenced except by addressing the issue (e.g., by using a command like chmod 600 to restrict access to the file).

Examples

To acquire a single certificate for both example.com and *.example.com, waiting 900 seconds for DNS propagation:

certbot certonly \\
  --authenticator certbot-dns-netcup:dns-netcup \\
  --certbot-dns-netcup:dns-netcup-credentials ~/.secrets/certbot/netcup.ini \\
  --certbot-dns-netcup:dns-netcup-propagation-seconds 900 \\
  --server https://acme-v02.api.letsencrypt.org/directory \
  -d 'example.com' \\
  -d '*.example.com'

Docker

In order to create a docker container with a certbot-dns-netcup installation, create an empty directory with the following Dockerfile:

FROM certbot/certbot
RUN pip install certbot-dns-netcup

Proceed to build the image:

docker build -t certbot/dns-netcup .

Once that’s finished, the application can be run as follows:

docker run --rm \
   -v /var/lib/letsencrypt:/var/lib/letsencrypt \
   -v /etc/letsencrypt:/etc/letsencrypt \
   --cap-drop=all \
   certbot/dns-netcup certonly \
   --authenticator certbot-dns-netcup:dns-netcup \
   --certbot-dns-netcup:dns-netcup-propagation-seconds 900 \
   --certbot-dns-netcup:dns-netcup-credentials \
       /var/lib/letsencrypt/netcup_credentials.ini \
   --no-self-upgrade \
   --keep-until-expiring --non-interactive --expand \
   --server https://acme-v02.api.letsencrypt.org/directory \
   -d example.com -d '*.example.com'

You may want to change the volumes /var/lib/letsencrypt and /etc/letsencrypt to local directories where the certificates and configuration should be stored.

Project details


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