Configuring FreeRADIUS

I’m trying to configure a FreeRADIUS server with NixOS. FreeRADIUS is a bit hostile in this regard, because most of the configuration is part of the derivation and hardcodes paths to itself. Ideally, I only want to override parts of it, but this looks like a lot of painful hackery.

So I wonder whether anyone has already setup a FreeRADIUS server with NixOS and is willing to share a configuration example.

Yes, we’re running freeradius on nixos; our config module (based on one originally written by @andir) is unfortunately not public, since we’re hardcoding a lot of information specific to our deployment in it; but I’ll summarise — I think the top of our config should address your problems with referencing the package:

{ config, pkgs, lib, ... }:
  pkg = pkgs.freeradius;
  configText = ''
    prefix = /dev/null

    checkrad = ${pkg}/bin/checkrad
    localstatedir = "/var/lib/freeradius"
    sbindir = "${pkg}/sbin"
    logdir = "/var/log/freeradius"
    run_dir = "/run/radiusd"
    libdir = "${pkg}/lib"
    radacctdir = "''${logdir}/radacct"
    pidfile = "/dev/null/var/run/radiusd/"
    # … log, client, thread pool, module, policy, and server config…
in {
  services.freeradius = {
    enable = true;
    configDir = pkgs.writeTextDir "radiusd.conf" configText;
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Thanks. This is super helpful. I’ll give it a shot!