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kasserver - Manage domains hosted on through the KAS server API

This project consists of the Python library kasserver and a few command line utilities to manage domains of the German webhoster through their KAS server API.

At the moment the main focus is managing DNS record as this allows to automate the creation of Let’s Encrypt (wildcard) certificates with the ACME DNS-01 challenge.


kasserver (and its dependencies) can be installed from PyPI with: pip3 install kasserver


Both library and command line utilities require access to the KAS credentials. Username and password are read from the KASSERVER_USER and KASSERVER_PASSWORD environment variables or from the ~/.netrc file:

password PASSWORD

The file must be accessible only by your user account: chmod 600 ~/.netrc.



A generic program to manage DNS records.

DNS records can be listed with:

$ kasserver-dns list
ID C Zone        Name Type  Data               Aux
 1 Y      A     X.X.X.X            0
 0 N      NS 0
 0 N      NS 0
 0 N www  CNAME        0

A new DNS record is added with:

kasserver-dns add CNAME

An existing DNS record is removed with:

kasserver-dns remove CNAME


The following programs are designed to be used together with ACME clients to automate DNS record creation/removal as it is required by a Let’s Encryt ACME DNS-01 challenge for automatic certificate renewal.


This program is designed to be used with Certbot:

certbot certonly -d --preferred-challenges dns \
                 --manual --manual-auth-hook kasserver-dns-certbot \
                          --manual-cleanup-hook kasserver-dns-certbot \

This program is designed to be used with lego:

EXEC_PATH=kasserver-dns-lego lego --dns exec \
    --domains --email run


This projected is licensed under the terms of the MIT license.

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