certbot-dns-desec 0.3.0

deSEC DNS Authenticator plugin for Certbot

certbot-dns-desec

⚠ This plugin is under development, API and CLI might change! ⚠

deSEC 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 deSEC DNS API.

Configuration of deSEC

Log in at deSEC and create the domain you would like to use and a token for DNS management.

Installation

This certbot plugin can be installed using pip:

python3 -m pip install certbot-dns-desec

Command Line Interface

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

1. --authenticator dns-desec Selects the authenticator plugin.
2. --dns-desec-credentials <file> Specifies the file holding the deSEC API credentials (required, see below).
3. --dns-desec-propagation-seconds Waiting time for DNS to propagate before asking the ACME server to verify the DNS record (default 5).

deSEC API Credentials

An example credentials.ini file:

dns_desec_token = token

Additionally, the URL of the deSEC API can be specified using the dns_desec_endpoint configuration option. https://desec.io/api/v1/ is the default.

The path to this file can be provided interactively or using the --dns-desec-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 token as you would the password to your deSEC account. Users who can read this file can use these credentials to issue 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).

Example Usage

To acquire a single certificate for both example.com and *.example.com:

certbot certonly \
     --authenticator dns-desec \
     --dns-desec-credentials /etc/letsencrypt/.secrets/domain.tld.ini \
     --server https://acme-v02.api.letsencrypt.org/directory \
     --agree-tos \
     --rsa-key-size 4096 \
     -d 'example.com' \
     -d '*.example.com'

Development and Testing

To test this, install the virtual environment (venv) for this repository and activate it. Register a domain $DOMAIN with desec.io, and obtain a DNS management token $TOKEN. Then run

python3 -m pip install .
TOKEN=token-you-obtained-from-desec-io
DOMAIN=domain-you-registered-at-desec-io
EMAIL=[e-mail]
echo "dns_desec_token = $TOKEN" > desec-secret.ini
chmod 600 desec-secret.ini
certbot \
    --config-dir tmp/certbot/config \
    --logs-dir tmp/certbot/logs \
    --work-dir tmp/certbot/work \
    --test-cert \
    -d $DOMAIN -d "*.$DOMAIN" \
    --authenticator dns-desec \
    --dns-desec-credentials desec-secret.ini \
    --non-interactive --agree-tos \
    --email $EMAIL \
    certonly

Maintenance: Prepare New Release

1. Make sure tests are okay (see GitHub actions)
2. Commit all changes
3. Clean up dist/ folder
4. Set up new release version: RELEASE=x.y.z
5. Update version to x.y.z in setup.py
6. Commit with message "Release Version vx.y.z": git commit -p -m "Release Version v$RELEASE"
7. Tag commit using git tag -as v$RELEASE -m "Release Version v$RELEASE"
8. Push
   1. branch: git push
   2. tag: git push origin v$RELEASE
9. Set environment variables GITHUB_TOKEN to a GitHub token, TWINE_USERNAME and TWINE_PASSWORD to PyPi credentials.
10. Publish using python3 -m publish desec-io certbot-dns-desec