From 1e996d4c05d8b6ac9885111cd07fcff0b11615aa Mon Sep 17 00:00:00 2001
From: NeilClack <cnclack@pm.me>
Date: Sun, 4 Oct 2026 18:12:47 -0500
Subject: [PATCH] Add tailscale

---
 configuration.nix | 80 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 79 insertions(+), 1 deletion(-)

diff --git a/configuration.nix b/configuration.nix
index 58678a8..d429dd8 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -11,6 +11,9 @@ let
     then "/var/lib/radiantwave/current/bin/radiantwave"
     else "/run/current-system/sw/bin/radiantwave";
   myKey = [ "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIL4qWNZnYU5JaqR9c2qh6oFZktzVNBOx42PfDaGofCL6 cnclack@pm.me macbook" ];
+
+  # Headscale preauth key. Paste/replace here.
+  headscaleAuthKey = "hskey-auth-zZdWiKTwDfTT-tgRKiAHyXabykoARDDyNfYihgVrJQ6y6zK7lwV0FW6xwHTdyWoqa_ZpCf80vgAJC";
 in
 {
   ############################################################
@@ -85,6 +88,81 @@ in
 
   networking.networkmanager.enable = true;
 
+  ############################################################
+  # Tailscale (self-hosted Headscale control plane)
+  ############################################################
+  # The node joins the RadiantWave Headscale server at
+  # hs.radiantwavetech.com using the *hardware serial* as its Tailscale
+  # node name (not networking.hostName), so a kiosk is always reachable at
+  # <serial> even though every variant shares one hostName per branch.
+  #
+  # The preauth key is set in `headscaleAuthKey` in the let block at the
+  # top of this file. NOTE: it ends up in the world-readable /nix/store, so
+  # keep this file out of public repos while a live key is in it.
+  services.tailscale = {
+    enable = true;
+    useRoutingFeatures = "client";
+  };
+
+  # Reach the kiosk's services (SSH, etc.) over the tailnet without extra
+  # per-port rules. Membership is gated by the preauth key.
+  networking.firewall.trustedInterfaces = [ "tailscale0" ];
+
+  systemd.services.radiantwave-tailscale-auth = {
+    description = "Join the RadiantWave tailnet using the hardware serial as node name";
+    after = [ "tailscaled.service" "network-online.target" ];
+    wants = [ "tailscaled.service" "network-online.target" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+    };
+    path = [ pkgs.tailscale pkgs.coreutils pkgs.gnused pkgs.gnugrep ];
+    script = ''
+      set -eu
+
+      # Hardware serial. x86 exposes it via DMI; Raspberry Pi exposes it in
+      # the device tree (null-terminated), mirrored under /proc/device-tree.
+      serial=""
+      for f in \
+        /sys/class/dmi/id/product_serial \
+        /sys/class/dmi/id/board_serial \
+        /sys/firmware/devicetree/base/serial-number \
+        /proc/device-tree/serial-number
+      do
+        if [ -r "$f" ]; then
+          serial="$(tr -d '\000' < "$f" | tr -d '\n\r')"
+          [ -n "$serial" ] && break
+        fi
+      done
+
+      # Tailscale node names are RFC 1035 labels: lowercase, [a-z0-9-], <=63.
+      serial="$(printf '%s' "$serial" \
+        | tr '[:upper:]' '[:lower:]' \
+        | tr -c 'a-z0-9-' '-' \
+        | sed -e 's/-\{1,\}/-/g' -e 's/^-//' -e 's/-$//' \
+        | cut -c1-63)"
+      [ -n "$serial" ] || serial="radiantwave-unknown"
+
+      echo "radiantwave-tailscale-auth: joining as '$serial'"
+      for _ in $(seq 1 30); do
+        if tailscale up \
+             --auth-key=${pkgs.lib.escapeShellArg headscaleAuthKey} \
+             --login-server=https://hs.radiantwavetech.com \
+             --hostname="$serial" \
+             --accept-dns=false
+        then
+          echo "radiantwave-tailscale-auth: connected"
+          exit 0
+        fi
+        sleep 2
+      done
+
+      echo "radiantwave-tailscale-auth: could not join tailnet after retries" >&2
+      exit 1
+    '';
+  };
+
   system.autoUpgrade = {
     enable = true;
     flake = upgradeFlakeRef;
@@ -263,4 +341,4 @@ in
       echo "Backup completed at $(date)" > "$BACKUP_DIR/.backup-timestamp"
     '';
   };
-}
+}
\ No newline at end of file