nixos: make more "traits" mixins

1 files changed, 34 insertions, 0 deletions

diff --git a/modules/nixos/mixins/tailscale.nix b/modules/nixos/mixins/tailscale.nix
new file mode 100644
index 0000000..177aa90
--- /dev/null
+++ b/modules/nixos/mixins/tailscale.nix
@@ -0,0 +1,34 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.services.tailscale;
+
+  usingTailscaleSSH = lib.elem "--ssh" config.services.tailscale.extraUpFlags;
+in
+
+{
+  config = lib.mkMerge [
+    {
+      services.tailscale = {
+        openFirewall = true;
+      };
+    }
+
+    (lib.mkIf cfg.enable {
+      networking.firewall = {
+        # Trust all connections over Tailscale
+        trustedInterfaces = [ config.services.tailscale.interfaceName ];
+      };
+    })
+
+    (lib.mkIf (cfg.enable && usingTailscaleSSH) {
+      networking.firewall = {
+        allowedTCPPorts = [ 22 ];
+      };
+    })
+  ];
+}