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Software managing certificate, dkim and domain updates automagically.

Project description

Build Status

Crypto Domain Manager

Automate all your cryptographic needs!


  • Zero downtime
  • Automatic certificate renewal
  • Spam protection
  • Updated DNS records

Configure once and always stay up to date.

Use cases

  • Renew letsencrypt certicates
  • Derive all kinds of data from the signature
  • Ensure everything is secure

External Service APIs

Linux Services

  • DKIM signatures:
    • rspamd
  • Reload systemd services:
    • apache2
    • postfix
    • dovecot
    • rspamd
    • traefik in Docker

Managed DNS Records

No downtime strategy

Updating keys, certifcates and other needs 3 steps to prevent gaps in availabillity:

  1. Prepare: Create certificates, keys etc. and publish corresponding records to DNS.
  2. Rollover: Apply new certificates and keys, because now negative cache TTL on DNS is reached.
  3. Cleanup: Delete all no more needed stuff from disk and DNS.

Needed Plugins and Dependencies

  • dnsuptools: to interface with DNS API -- updating DNS entries
  • dehydrated: to get new certificate (included with cryptdomainmgr)
  • rspamd: to create (and use) DKIM keys


These libraries are needed for pycurl used by dnsuptools for automatic ip retrieving:

apt install -y libcurl4-openssl-dev libssl-dev

This comman is used by dehydrated to communicate with letsencrypt for certificate renewal:

apt install -y curl

For DKIM we need rspamd:

apt install -y lsb-release wget # optional
CODENAME=`lsb_release -c -s`
wget -O- | apt-key add -
echo "deb [arch=amd64] $CODENAME main" > /etc/apt/sources.list.d/rspamd.list
echo "deb-src [arch=amd64] $CODENAME main" >> /etc/apt/sources.list.d/rspamd.list
apt update
apt install -y rspamd

Now install the cryptdomainmgr. This pulls all need dependencies.

python2 -m pip install cryptdomainmgr

Feel free to try python3, but inwx client doesn't support it.

python3 -m pip install cryptdomainmgr


We need help here!

For now please look at:


  • Multiple Configfiles with priority allowed
  • Specify content of config file content as argument

Next goals

  • improve documentation
  • docker support - partly done, ToDo: label handling needed, daemon mode without external shell stript needed
  • website
  • automated tests - partly done
  • nsupdate for DNS updates

Long term goals:

  • ARC key renewal
  • WPIA integration
  • DNSSEC key renewal
  • TXT record (may collide with SPF and other TXT based records)
  • multi server support for one domain: TLSA delete by timeout
  • constrain minimum renewal/phase time interval
  • validations - ensure signatures are used correctly
  • run as service
  • PowerDNS support


If you like the project feel free to give me a star. Please let us know if you use this project.

All kind of contributions are welcome.

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