add authoritative DNS server

nixos/machines/default.nix

@@ -43,6 +43,7 @@
 
     nixosModule.lab = {
       dataHost.enable = true;
+      dns.enable = true;
 
       storage = {
         osDisk = "/dev/sda";

nixos/modules/default.nix

@@ -11,6 +11,7 @@ in
     ./backups.nix
     ./networking.nix
     ./data-sharing.nix
+    ./dns.nix
   ];
 
   options.lab.dataHost.enable = lib.mkOption {

nixos/modules/dns.nix

@@ -0,0 +1,121 @@
+{ pkgs, lib, config, ... }:
+let
+  cfg = config.lab.dns;
+  kunisZoneFile = pkgs.writeTextFile {
+    name = "kunis-zone-file";
+    text = ''
+      $ORIGIN kun.is.
+      $TTL 1m
+
+      @ IN SOA ns1.kun.is. hostmaster.kun.is. (
+        1704580936
+        1D
+        1H
+        1W
+        1D )
+
+                                 IN  NS     ns1.kun.is.
+                                 IN  NS     ns2.kun.is.
+
+      @                          IN  MX     10  mail.kun.is. 
+
+
+      ns                         IN  A      192.145.57.90
+      ns1                        IN  A      192.145.57.90
+      ns2                        IN  A      192.145.57.90
+      *                          IN  A      192.145.57.90
+      verify.bing.com.           IN  CNAME  fcfe5d31d5b7ae1af0b352a6b4c75d3f
+      @                    IN  TXT    "\"google-site-verification=sznWJNdSZfiAESJhnDQEJ6hf06W9vndvhMi6wP_HH04\""
+    '';
+  };
+
+  geokunisnlZoneFile = pkgs.writeTextFile {
+    name = "geokunisnl-zone-file";
+    text = ''
+      $ORIGIN geokunis2.nl.
+      $TTL 1h
+
+      @ IN SOA ns.geokunis2.nl. hostmaster.geokunis2.nl. (
+        1704580936
+        1D
+        1H
+        1W
+        1D )
+
+                                 IN  NS     ns.geokunis2.nl.
+                                 IN  NS     ns0.transip.net.
+                                 IN  NS     ns1.transip.nl.
+                                 IN  NS     ns2.transip.eu.
+
+      @                          IN  MX     10  mail.geokunis2.nl. 
+
+
+      @                          IN  A      192.145.57.90
+      @                          IN  AAAA   2a0d:6e00:1a77:30:b62e:99ff:fe77:1bda
+      mail                       IN  A      192.145.57.90
+      wg                         IN  A      192.145.57.90
+      wg                         IN  AAAA   2a0d:6e00:1a77::1
+      wg4                        IN  A      192.145.57.90
+      wg6                        IN  AAAA   2a0d:6e00:1a77::1
+      tuindersweijde             IN  A      192.145.57.90
+      ns                         IN  A      192.145.57.90
+      ns                         IN  AAAA   2a0d:6e00:1a77:30:c8fe:c0ff:feff:ee07
+      cyberchef                  IN  A      192.145.57.90
+      cyberchef                  IN  AAAA   2a0d:6e00:1a77:30:c8fe:c0ff:feff:ee03
+      inbucket                   IN  A      192.145.57.90
+      kms                        IN  A      192.145.57.90
+      @                    IN  CAA    0 issue \"letsencrypt.org\"
+    '';
+  };
+in
+{
+  options.lab.dns.enable = lib.mkOption {
+    default = false;
+    type = lib.types.bool;
+    description = ''
+      Whether to enable an authoritative DNS server and DNSmasq for DMZ network.
+    '';
+  };
+
+  config = lib.mkIf cfg.enable {
+    networking.firewall = {
+      allowedTCPPorts = [ 53 ];
+      allowedUDPPorts = [ 53 ];
+    };
+
+    services.bind = {
+      enable = true;
+      forwarders = [ ];
+      # TODO: disable ipv6 for now, as the hosts themselves lack routes it seems.
+      ipv4Only = true;
+
+      extraOptions = ''
+        allow-transfer { none; }; 
+        allow-recursion { none; };
+        version "No dice.";
+      '';
+
+      zones = {
+        "kun.is" = {
+          master = true;
+          file = kunisZoneFile;
+          allowQuery = [ "any" ];
+          extraConfig = ''
+            notify yes;
+            allow-update { none; };
+          '';
+        };
+
+        "geokunis2.nl" = {
+          master = true;
+          file = geokunisnlZoneFile;
+          allowQuery = [ "any" ];
+          extraConfig = ''
+            notify yes;
+            allow-update { none; };
+          '';
+        };
+      };
+    };
+  };
+}