IONOS DNS Authenticator plugin for Certbot
Project description
certbot-dns-ionos
IONOS 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 IONOS Remote API.
Configuration of IONOS
In the System -> Remote Users you have to have a user, with the following rights
Client Functions
DNS zone functions
DNS txt functions
Installation
pip install certbot-dns-ionos
Named Arguments
To start using DNS authentication for ionos, pass the following arguments on certbot’s command line:
--authenticator dns-ionos |
select the authenticator plugin (Required) |
--dns-ionos-credentials |
ionos Remote User credentials INI file. (Required) |
--dns-ionos-propagation-seconds |
waiting time for DNS to propagate before asking the ACME server to verify the DNS record. (Default: 10, Recommended: >= 600) |
Credentials
An example credentials.ini file:
dns_ionos_prefix = myapikeyprefix
dns_ionos_secret = verysecureapikeysecret
dns_ionos_endpoint = https://api.hosting.ionos.com
The key can be managed under the following link: https://developer.hosting.ionos.de/?source=IonosControlPanel
The path to this file can be provided interactively or using the --dns-ionos-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 ionos 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 and chmod 700 to restrict access to the folder).
Examples
To acquire a single certificate for both example.com and *.example.com, waiting 900 seconds for DNS propagation:
certbot certonly \
--authenticator dns-ionos \
--dns-ionos-credentials /etc/letsencrypt/.secrets/domain.tld.ini \
--dns-ionos-propagation-seconds 900 \
--server https://acme-v02.api.letsencrypt.org/directory \
--agree-tos \
--rsa-key-size 4096 \
-d 'example.com' \
-d '*.example.com'
Docker
In order to create a docker container with a certbot-dns-ionos installation, create an empty directory with the following Dockerfile:
FROM certbot/certbot
RUN pip install certbot-dns-ionos
Proceed to build the image:
docker build -t certbot/dns-ionos .
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-ionos certonly \ --authenticator dns-ionos \ --dns-ionos-propagation-seconds 900 \ --dns-ionos-credentials \ /etc/letsencrypt/.secrets/domain.tld.ini \ --no-self-upgrade \ --keep-until-expiring --non-interactive --expand \ --server https://acme-v02.api.letsencrypt.org/directory \ -d example.com -d '*.example.com'
It is suggested to secure the folder as follows:: chown root:root /etc/letsencrypt/.secrets chmod 700 /etc/letsencrypt/.secrets
The file ‘domain.tld.ini’ must be replaced with the version of the example ‘credentials.ini’ adapted to your provider.
Changelog
2024.01.08
Update README.rst - Add Link to IONOS control panel and reference between credentials.ini and domain.tld.ini
2023.11.13
Fix managed zone lookup to ensure correct domain is selected where there are two domains with the same ending e.g. example.com and thisisanexample.com (PR #22)
2022.11.24
remove zope to fix compatibility with Certbot 2.x (Fixes #19)
As a reminder, Certbot will default to issuing ECDSA certificates from release 2.0.0. If you update from a prior certbot release, run the plugin once manually. You will be prompted to update RSA key type to ECDSA.
2022.05.15 - Added capability to handle multiple domain validations #16
2021.09.20.post1
Fix version number
2021.09.20
Fix #9 Domain not known when using subdomain
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