add bind

systems/hetzner/bind.nix

@@ -0,0 +1,60 @@
+{ ... }:
+
+{
+  services.bind = {
+    enable = true;
+    extraConfig = ''
+      include "/var/lib/secrets/dnskeys.conf";
+    '';
+    zones = [
+      rec {
+        name = "net0loggy.net";
+        file = "/var/db/bind/${name}";
+        master = true;
+        extraConfig = "allow-update { key rfc2136key.net0loggy.net.; };";
+      }
+    ];
+  };
+
+  # Now we can configure ACME
+  security.acme.acceptTerms = true;
+  security.acme.defaults.email = "admin+acme@net0loggy.net";
+  security.acme.certs."net0loggy.net" = {
+    domain = "*.net0loggy.net";
+    dnsProvider = "rfc2136";
+    environmentFile = "/var/lib/secrets/certs.secret";
+    # We don't need to wait for propagation since this is a local DNS server
+    dnsPropagationCheck = false;
+  };
+
+  systemd.services.dns-rfc2136-conf = {
+    requiredBy = [ "acme-net0loggy.net.service" "bind.service" ];
+    before = [ "acme-net0loggy.net.service" "bind.service" ];
+    unitConfig = {
+      ConditionPathExists = "!/var/lib/secrets/dnskeys.conf";
+    };
+    serviceConfig = {
+      Type = "oneshot";
+      UMask = 0077;
+    };
+    path = [ pkgs.bind ];
+    script = ''
+      mkdir -p /var/lib/secrets
+      chmod 755 /var/lib/secrets
+      tsig-keygen rfc2136key.net0loggy.net > /var/lib/secrets/dnskeys.conf
+      chown named:root /var/lib/secrets/dnskeys.conf
+      chmod 400 /var/lib/secrets/dnskeys.conf
+
+      # extract secret value from the dnskeys.conf
+      while read x y; do if [ "$x" = "secret" ]; then secret="''${y:1:''${#y}-3}"; fi; done < /var/lib/secrets/dnskeys.conf
+
+      cat > /var/lib/secrets/certs.secret << EOF
+      RFC2136_NAMESERVER='127.0.0.1:53'
+      RFC2136_TSIG_ALGORITHM='hmac-sha256.'
+      RFC2136_TSIG_KEY='rfc2136key.net0loggy.net'
+      RFC2136_TSIG_SECRET='$secret'
+      EOF
+      chmod 400 /var/lib/secrets/certs.secret
+    '';
+  };
+}

systems/hetzner/default.nix

@@ -6,6 +6,7 @@
     self.inputs.srvos.nixosModules.server
     self.inputs.srvos.nixosModules.hardware-hetzner-online-amd
     self.inputs.srvos.nixosModules.mixins-nginx
+    ./bind.nix
   ];
 
   jopejoe1 = {