nix-dotfiles/hosts/tsuki/services/matrix/coturn.nix

{ config, lib, secrets, ... }:
let
  cfg = config.services.coturn;
in
{
  services.coturn = let
    # certName = config.services.nginx.virtualHosts.${cfg.realm}.useACMEHost;
    certName = "nani.wtf";
    certDir = config.security.acme.certs.${certName}.directory;
  in rec {
    enable = true;
    no-cli = true;
    no-tcp-relay = true;
    min-port = 46000;
    max-port = 47000;
    use-auth-secret = true;
    static-auth-secret = secrets.keys.matrix.static-auth-secret;
    realm = "turn.nani.wtf";
    cert = "${certDir}/cert.pem";
    pkey = "${certDir}/key.pem";
    extraConfig = ''
      # for debugging
      verbose
      # ban private IP ranges
      no-multicast-peers
      denied-peer-ip=0.0.0.0-0.255.255.255
      denied-peer-ip=10.0.0.0-10.255.255.255
      denied-peer-ip=100.64.0.0-100.127.255.255
      denied-peer-ip=127.0.0.0-127.255.255.255
      denied-peer-ip=169.254.0.0-169.254.255.255
      denied-peer-ip=172.16.0.0-172.31.255.255
      denied-peer-ip=192.0.0.0-192.0.0.255
      denied-peer-ip=192.0.2.0-192.0.2.255
      denied-peer-ip=192.88.99.0-192.88.99.255
      denied-peer-ip=192.168.0.0-192.168.255.255
      denied-peer-ip=198.18.0.0-198.19.255.255
      denied-peer-ip=198.51.100.0-198.51.100.255
      denied-peer-ip=203.0.113.0-203.0.113.255
      denied-peer-ip=240.0.0.0-255.255.255.255
      denied-peer-ip=::1
      denied-peer-ip=64:ff9b::-64:ff9b::ffff:ffff
      denied-peer-ip=::ffff:0.0.0.0-::ffff:255.255.255.255
      denied-peer-ip=100::-100::ffff:ffff:ffff:ffff
      denied-peer-ip=2001::-2001:1ff:ffff:ffff:ffff:ffff:ffff:ffff
      denied-peer-ip=2002::-2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff
      denied-peer-ip=fc00::-fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
      denied-peer-ip=fe80::-febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
    '';
  };

  networking.firewall = lib.mkIf cfg.enable {
    interfaces.enp2s0 = let
      range = [{
        from = cfg.min-port;
        to = cfg.max-port;
      }];
    in
    {
      allowedUDPPortRanges = range;
      allowedUDPPorts = [ cfg.listening-port ];
      allowedTCPPortRanges = range;
      allowedTCPPorts = [ cfg.listening-port ];
    };
  };
}