beginnings of split dns

devShells.nix

@@ -1,12 +1,12 @@
-{ ... }:
+{ inputs, ... }:
 
 {
   perSystem =
-    { pkgs, ... }:
+    { pkgs, system, ... }:
     {
       devShells.default = pkgs.mkShell {
         packages = with pkgs; [
-          agenix-cli
+          inputs.agenix.packages.${system}.default
           deploy-rs
           nil
           nixfmt-rfc-style

hosts/alexandria/forgejo.nix

@@ -32,4 +32,13 @@ in
     domains."git.baduhai.dev".locations."/".proxyPass =
       "http://unix:${config.services.forgejo.settings.server.HTTP_ADDR}:/";
   };
+
+  # Register this domain for split DNS
+  services.splitDNS.entries = [
+    {
+      domain = "git.baduhai.dev";
+      lanIP = "192.168.15.142";
+      tailscaleIP = "100.76.19.50";
+    }
+  ];
 }

hosts/alexandria/jellyfin.nix

@@ -13,4 +13,13 @@ in
     acmeHost = "baduhai.dev";
     domains."jellyfin.baduhai.dev".locations."/".proxyPass = "http://127.0.0.1:8096/";
   };
+
+  # Register this domain for split DNS
+  services.splitDNS.entries = [
+    {
+      domain = "jellyfin.baduhai.dev";
+      lanIP = "192.168.15.142";
+      tailscaleIP = "100.76.19.50";
+    }
+  ];
 }

hosts/alexandria/librespeed.nix

@@ -27,4 +27,13 @@ in
     acmeHost = "baduhai.dev";
     domains."speedtest.baduhai.dev".locations."/".proxyPass = "http://127.0.0.1:58080/";
   };
+
+  # Register this domain for split DNS
+  services.splitDNS.entries = [
+    {
+      domain = "speedtest.baduhai.dev";
+      lanIP = "192.168.15.142";
+      tailscaleIP = "100.76.19.50";
+    }
+  ];
 }

hosts/alexandria/nextcloud.nix

@@ -79,6 +79,15 @@ in
       acmeHost = "baduhai.dev";
       domains."cloud.baduhai.dev" = { };
     };
+
+    # Register this domain for split DNS
+    splitDNS.entries = [
+      {
+        domain = "cloud.baduhai.dev";
+        lanIP = "192.168.15.142";
+        tailscaleIP = "100.76.19.50";
+      }
+    ];
   };
 
   age.secrets = {

hosts/alexandria/nginx.nix

@@ -38,6 +38,11 @@ in
 
   users.users.nginx.extraGroups = [ "acme" ];
 
+  networking.firewall.allowedTCPPorts = [
+    80
+    443
+  ];
+
   age.secrets.cloudflare = {
     file = ../../secrets/cloudflare.age;
     owner = "nginx";

hosts/alexandria/unbound.nix

@@ -0,0 +1,67 @@
+{ config, inputs, lib, ... }:
+
+let
+  utils = import ../../utils.nix { inherit inputs lib; };
+  inherit (utils) mkSplitDNS;
+in
+
+{
+  imports = [ ../modules/split-dns.nix ];
+
+  services.unbound = {
+    enable = true;
+    enableRootTrustAnchor = true;
+    settings = {
+      server = {
+        interface = [
+          "0.0.0.0"
+          "::"
+        ];
+        access-control = [
+          "127.0.0.0/8 allow"
+          "192.168.0.0/16 allow"
+          "100.64.0.0/10 allow" # Tailscale CGNAT range
+          "::1/128 allow"
+          "fd7a:115c:a1e0::/48 allow" # Tailscale IPv6
+        ];
+
+        # Enable views for split DNS
+        access-control-view = [
+          "100.64.0.0/10 tailscale"
+          "fd7a:115c:a1e0::/48 tailscale"
+          "192.168.0.0/16 lan"
+        ];
+
+        num-threads = 2;
+        msg-cache-size = "50m";
+        rrset-cache-size = "100m";
+        cache-min-ttl = 300;
+        cache-max-ttl = 86400;
+        prefetch = true;
+        prefetch-key = true;
+        hide-identity = true;
+        hide-version = true;
+        so-rcvbuf = "1m";
+        so-sndbuf = "1m";
+      };
+      # Split DNS views - automatically collected from all service files
+      view = mkSplitDNS config.services.splitDNS.entries;
+
+      forward-zone = [
+        {
+          name = ".";
+          forward-addr = [
+            "1.1.1.1@853#cloudflare-dns.com"
+            "1.0.0.1@853#cloudflare-dns.com"
+          ];
+          forward-tls-upstream = true;
+        }
+      ];
+    };
+  };
+
+  networking.firewall = {
+    allowedTCPPorts = [ 53 ];
+    allowedUDPPorts = [ 53 ];
+  };
+}

hosts/alexandria/vaultwarden.nix

@@ -24,4 +24,13 @@ in
     domains."pass.baduhai.dev".locations."/".proxyPass =
       "http://${config.services.vaultwarden.config.ROCKET_ADDRESS}:${toString config.services.vaultwarden.config.ROCKET_PORT}/";
   };
+
+  # Register this domain for split DNS
+  services.splitDNS.entries = [
+    {
+      domain = "pass.baduhai.dev";
+      lanIP = "192.168.15.142";
+      tailscaleIP = "100.76.19.50";
+    }
+  ];
 }

hosts/modules/split-dns.nix

@@ -0,0 +1,28 @@
+{ config, lib, ... }:
+
+{
+  options.services.splitDNS = {
+    entries = lib.mkOption {
+      type = lib.types.listOf (
+        lib.types.submodule {
+          options = {
+            domain = lib.mkOption {
+              type = lib.types.str;
+              description = "The domain name to configure";
+            };
+            lanIP = lib.mkOption {
+              type = lib.types.str;
+              description = "IP address to return for LAN requests";
+            };
+            tailscaleIP = lib.mkOption {
+              type = lib.types.str;
+              description = "IP address to return for Tailscale requests";
+            };
+          };
+        }
+      );
+      default = [ ];
+      description = "List of domains to configure for split DNS";
+    };
+  };
+}

utils.nix

@@ -190,4 +190,33 @@ in
       };
     in
     lib.mapAttrs (_: lib.recursiveUpdate commonVHostConfig) domains;
+
+  # Split DNS utilities for unbound
+  # Generates unbound view config from a list of DNS entries
+  mkSplitDNS =
+    entries:
+    let
+      # Generate view entries for a single domain
+      mkEntry =
+        {
+          domain,
+          lanIP,
+          tailscaleIP,
+        }:
+        [
+          {
+            name = "tailscale";
+            view-first = true;
+            local-zone = ''"baduhai.dev." transparent'';
+            local-data = ''"${domain}. IN A ${tailscaleIP}"'';
+          }
+          {
+            name = "lan";
+            view-first = true;
+            local-zone = ''"baduhai.dev." transparent'';
+            local-data = ''"${domain}. IN A ${lanIP}"'';
+          }
+        ];
+    in
+    builtins.concatMap mkEntry entries;
 }