⚠️WARNING: ZeroSSL removed the Delete Certificate API endpoint, free account can't renew certificate infinitely.

zerossl-ip-cert is a automation tool for issuing ZeroSSL IP certificates.

• Use ZeroSSL REST API to implement certificate issuing.
• Mainly made for IP certificates (ipv4 only for now).
• Call external program for automatically verification.
• Painless certificate renewal.
• Cross platform (Linux/Macos/Windows).

Installation

• Package zerossl-ip-cert contains ZeroSSL REST API client, one can just go get github.com/tinkernels/zerossl-ip-cert and import it to use the client.
• To build static executables, clone this repository and make release , or you can make your desire target binary, just take a look at the Makefile.

Usage

zerossl-ip-cert rely on configuration file to run. To archive the goal of issuing certificate automatically, you need do some additional work, saying the external hook.

Usage Info

Usage: zerossl-ip-cert [ -renew ] -config CONFIG_FILE

  -config string
        Config file
  -renew
        Renew existing certs only

Configuration File

You can find a sample configuration file here, with enough comments in it.

And also a sample state record file here, just for troubleshooting.

External Hook

zerossl-ip-cert use HTTP_CSR_HASH validation method to verify domains (including ip address surely), get more information from the ZeroSSL official documentation.

So you should have a http server running and prepare hook programs to finish the domain verification.

• verify-hook will be called before domain verification, some environment variables will be passed to it.

  ZEROSSL_HTTP_FV_HOST stands for listening host, here will be ip address.

  ZEROSSL_HTTP_FV_PATH stands for url path, where verification content will locate.

  ZEROSSL_HTTP_FV_PORT stands for listening port, ZeroSSL only reach port 80 of your http server according to use experience.

  ZEROSSL_HTTP_FV_CONTENT stands for validation content, ZeroSSL will check it when domain verification started.

  And a sample script for nginx can be found here, a sample script for caddy can be found here.

  P.S. When running in Windows OS, text lines are concatenated with spaces in %ZEROSSL_HTTP_FV_CONTENT%, as windows doesn't accept multiline variables without using magic.

• post-hook will be called after certification downloading, and some other environment variables will be passed to it.

  ZEROSSL_CERT_FPATH stands for the store path of certificate.

  ZEROSSL_KEY_FPATH stands for the store path of private key.

  And a sample script for nginx can be found here, a sample script for caddy can be found here.

License

Apache-2.0