From a9dab79eac7694fe1f27abde1f23169200d7953c Mon Sep 17 00:00:00 2001
From: Ethel Morgan <eth@ethulhu.co.uk>
Date: Sun, 24 May 2020 01:10:53 +0100
Subject: add service module for Mosquitto

---
 module-list.nix                |  1 +
 modules/services/mosquitto.nix | 82 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 modules/services/mosquitto.nix

diff --git a/module-list.nix b/module-list.nix
index c0bb715..8885c39 100644
--- a/module-list.nix
+++ b/module-list.nix
@@ -3,6 +3,7 @@
   ./modules/keyboard.nix
   ./modules/linode.nix
   ./modules/overlays.nix
+  ./modules/services/mosquitto.nix
   ./modules/services/snapclient.nix
   ./modules/upmpdcli.nix
   ./modules/users.nix
diff --git a/modules/services/mosquitto.nix b/modules/services/mosquitto.nix
new file mode 100644
index 0000000..a2d3fb5
--- /dev/null
+++ b/modules/services/mosquitto.nix
@@ -0,0 +1,82 @@
+{ config, lib, pkgs, ... }:
+with lib;
+
+let
+
+  cfg = config.eth.services.mosquitto;
+
+  mosquittoConf = pkgs.writeText "mosquitto.conf" ''
+    ${optionalString cfg.mqtt.enable ''
+      listener ${toString cfg.mqtt.port} ${optionalString (cfg.mqtt.host != "") cfg.mqtt.host}
+    ''}
+
+    ${optionalString cfg.websockets.enable ''
+      listener ${toString cfg.websockets.port} ${optionalString (cfg.websockets.host != "") cfg.websockets.host}
+      protocol websockets
+    ''}
+
+    ${optionalString cfg.persistence "persistence true"}
+  '';
+
+in {
+
+  options.eth.services.mosquitto = {
+
+    enable = mkEnableOption "Whether to enable mosquitto.";
+
+    persistence = mkOption {
+      type = types.bool;
+      default = true;
+    };
+
+    mqtt = {
+      enable = mkEnableOption "Whether to listen on unencrypted MQTT.";
+      host = mkOption {
+        type = types.str;
+        default = "";
+        example = "10.11.12.14";
+      };
+      port = mkOption {
+        type = types.int;
+        default = 1883;
+      };
+    };
+
+    websockets = {
+      enable = mkEnableOption "Whether to listen on unencrypted Websockets.";
+      host = mkOption {
+        type = types.str;
+        default = "";
+        example = "10.11.12.14";
+      };
+      port = mkOption {
+        type = types.int;
+        default = 1884;
+      };
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+
+    systemd.services.mosquitto = {
+      enable = true;
+      description = "Mosquitto MQTT broker";
+      wants = [ "network.target" ];
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        DynamicUser = true;
+        RuntimeDirectory = "mosquitto";
+        StateDirectory = "mosquitto";
+        ExecStart = "${pkgs.mosquitto}/bin/mosquitto -c ${mosquittoConf}";
+        NoNewPrivileges = true;
+        ProtectKernelTunables = true;
+        ProtectControlGroups = true;
+        ProtectKernelModules = true;
+        RestrictAddressFamilies = "AF_INET AF_INET6 AF_UNIX";
+        RestrictNamespaces = true;
+      };
+    };
+  };
+}
-- 
cgit v1.2.3