1 files changed, 43 insertions, 0 deletions
diff --git a/nixos/modules/programs/mosh.nix b/nixos/modules/programs/mosh.nix
new file mode 100644
index 00000000000..e08099e21a0
--- /dev/null
+++ b/nixos/modules/programs/mosh.nix
@@ -0,0 +1,43 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg  = config.programs.mosh;
+
+in
+{
+  options.programs.mosh = {
+    enable = mkOption {
+      description = ''
+        Whether to enable mosh. Note, this will open ports in your firewall!
+      '';
+      default = false;
+      type = lib.types.bool;
+    };
+    withUtempter = mkOption {
+      description = ''
+        Whether to enable libutempter for mosh.
+        This is required so that mosh can write to /var/run/utmp (which can be queried with `who` to display currently connected user sessions).
+        Note, this will add a guid wrapper for the group utmp!
+      '';
+      default = true;
+      type = lib.types.bool;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [ mosh ];
+    networking.firewall.allowedUDPPortRanges = [ { from = 60000; to = 61000; } ];
+    security.wrappers = mkIf cfg.withUtempter {
+      utempter = {
+        source = "${pkgs.libutempter}/lib/utempter/utempter";
+        owner = "root";
+        group = "utmp";
+        setuid = false;
+        setgid = true;
+      };
+    };
+  };
+}