certbot-dns-websupport

certbot-dns-websupport

Websupport.sk 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 Websupport Remote API.

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Installation

pip install certbot-dns-websupport

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Named Arguments

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

Command	Description
--authenticator dns-websupport	select the authenticator plugin (Required)
--dns-websupport-credentials "/path/to/credentials.ini"	websupport user INI file. (Required)
--dns-websupport-propagation-seconds "120"	waiting time for DNS to propagate before the ACMEserver to verify the DNS (Default: 60, Recommended: >= 120)

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Credentials file

Obtain an identifier and secret key (see Account Page)

An example credentials.ini file:

dns_websupport_identifier = <identifier>
dns_websupport_secret_key = <secret_key>

The path to this file can be provided interactively or using the --dns-websupport-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 websupport 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).

It is suggested to secure the .ini folder as follows:

chown root:root /etc/letsencrypt/.secrets
chmod 600 /etc/letsencrypt/.secrets

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Direct command

To acquire a single certificate for *.example.com, waiting 600 seconds for DNS propagation:

certbot certonly \
    --authenticator dns-websupport \
    --dns-websupport-propagation-seconds "600" \
    --dns-websupport-credentials "/etc/letsencrypt/.secrets/credentials.ini" \
    --email [e-mail] \
    --agree-tos \
    --non-interactive \
    --rsa-key-size 4096 \
    -d *.example.com

NOTE: Don't forget to properly edit your ini file name and mail address.

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Auto renew

Add cronjob:

0 3 * * * certbot renew \
    --authenticator dns-websupport \
    --dns-websupport-propagation-seconds "600" \
    --dns-websupport-credentials "/etc/letsencrypt/.secrets/credentials.ini" \
    --post-hook "systemctl reload nginx"

Docker

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

FROM certbot/certbot
RUN pip3 install certbot-dns-websupport

Proceed to build the image:

docker build -t certbot/dns-websupport .

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

sudo docker run -it --rm \
    -v /var/lib/letsencrypt:/var/lib/letsencrypt \
    -v /etc/letsencrypt:/etc/letsencrypt \
    certbot/dns-websupport \
    certonly \
    --authenticator dns-websupport \
    --dns-websupport-propagation-seconds "600" \
    --dns-websupport-credentials "/etc/letsencrypt/.secrets/credentials.ini" \
    --email [e-mail] \
    --agree-tos \
    --non-interactive \
    --rsa-key-size 4096 \
    -d *.example.com

NOTE: Check if your volumes on host system match this example (Depends if you installed your server on host system or inside docker). If not, you will have to edit this command. Also don't forget to properly edit your ini file name and mail address.

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