vps: add task force beta bot

sys/modules/default.nix

@@ -19,5 +19,6 @@
     ./borgsync.nix
     ./dufs.nix
     ./defaultDesktopPack.nix
+    ./task-force-beta-bot.nix
   ];
 }

sys/modules/task-force-beta-bot.nix

@@ -0,0 +1,106 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.local.sys.task-force-beta-bot;
+
+  allowedChatsFile = pkgs.writeText "task-force-beta-bot-allowed-chats" (
+    lib.concatMapStringsSep "\n" toString cfg.allowedChats
+  );
+
+  package = pkgs.rustPlatform.buildRustPackage {
+    pname = "task-force-beta-bot";
+    version = "0.1.0";
+
+    src = pkgs.fetchgit {
+      url = "https://git.posixlycorrect.com/fabian/task-force-beta-bot";
+      rev = "3ff112b1cd123d89023a9ba08ffee450ce2a88d9";
+      hash = "sha256-4BIjcLZ/E5k8NLoYNN6yF2xHr8qSHGXCP0Vk3JTB/q0=";
+    };
+
+    cargoHash = "sha256-IMa45oJZuYL14+ZWYPCmXquBntBIZU+fe6J0Rx8KdjU=";
+
+    meta = {
+      description = "General-purpose modular Telegram bot";
+      mainProgram = "task_force_beta_bot";
+    };
+  };
+in {
+  options.local.sys.task-force-beta-bot = {
+    enable = lib.mkEnableOption "the Task Force Beta Telegram bot";
+
+    tokenFile = lib.mkOption {
+      type = lib.types.path;
+      description = "Path to the Telegram bot token file.";
+    };
+
+    allowedChats = lib.mkOption {
+      type = lib.types.listOf lib.types.int;
+      description = "List of Telegram chat IDs allowed to use the bot.";
+    };
+
+    user = lib.mkOption {
+      type = lib.types.str;
+      default = "task-force-beta-bot";
+      description = "User to run the bot as.";
+    };
+
+    group = lib.mkOption {
+      type = lib.types.str;
+      default = "task-force-beta-bot";
+      description = "Group for the bot service.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.task-force-beta-bot = {
+      after = ["network.target"];
+      wantedBy = ["multi-user.target"];
+
+      serviceConfig = {
+        ExecStart = "${lib.getExe package} ${cfg.tokenFile} ${allowedChatsFile}";
+        User = cfg.user;
+        Group = cfg.group;
+        Restart = "on-failure";
+        RestartSec = "5s";
+
+        # Hardening
+        CapabilityBoundingSet = "";
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectSystem = "strict";
+        RestrictAddressFamilies = ["AF_INET" "AF_INET6"];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+        SystemCallFilter = ["@system-service" "~@privileged"];
+
+        # Token and allowed chats file access
+        BindReadOnlyPaths = [builtins.storeDir cfg.tokenFile "${allowedChatsFile}"];
+      };
+    };
+
+    users = {
+      users.task-force-beta-bot = lib.mkIf (cfg.user == "task-force-beta-bot") {
+        group = cfg.group;
+        isSystemUser = true;
+      };
+      groups.task-force-beta-bot = lib.mkIf (cfg.group == "task-force-beta-bot") {};
+    };
+  };
+}