nixos/qui: init service

nixos/doc/manual/release-notes/rl-2605.section.md

@@ -20,6 +20,8 @@
 
 - [reaction](https://reaction.ppom.me/), a daemon that scans program outputs for repeated patterns, and takes action. A common usage is to scan ssh and webserver logs, and to ban hosts that cause multiple authentication errors. A modern alternative to fail2ban. Available as [services.reaction](#opt-services.reaction.enable).
 
+- [qui](https://github.com/autobrr/qui), a modern alternative webUI for qBittorrent, with multi-instance support. Written in Go/React. Available as [services.qui](#opt-services.qui.enable).
+
 - [LibreChat](https://www.librechat.ai/), open-source self-hostable ChatGPT clone with Agents and RAG APIs. Available as [services.librechat](#opt-services.librechat.enable).
 
 - [DankMaterialShell](https://danklinux.com), a complete desktop shell for Wayland compositors built with Quickshell. Available as [programs.dms-shell](#opt-programs.dms-shell.enable).

nixos/modules/module-list.nix

@@ -1547,6 +1547,7 @@
   ./services/torrent/opentracker.nix
   ./services/torrent/peerflix.nix
   ./services/torrent/qbittorrent.nix
+  ./services/torrent/qui.nix
   ./services/torrent/rtorrent.nix
   ./services/torrent/torrentstream.nix
   ./services/torrent/transmission.nix

nixos/modules/services/torrent/qui.nix

@@ -0,0 +1,191 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  inherit (lib)
+    getExe
+    maintainers
+    mkEnableOption
+    mkIf
+    mkOption
+    mkPackageOption
+    ;
+  inherit (lib.types)
+    bool
+    path
+    port
+    str
+    submodule
+    ;
+  cfg = config.services.qui;
+
+  stateDir = "/var/lib/qui";
+  configFormat = pkgs.formats.toml { };
+  configFile = configFormat.generate "qui.toml" cfg.settings;
+in
+{
+  options = {
+    services.qui = {
+      enable = mkEnableOption "qui";
+
+      package = mkPackageOption pkgs "qui" { };
+
+      user = mkOption {
+        type = str;
+        default = "qui";
+        description = "User to run qui as.";
+      };
+
+      group = mkOption {
+        type = str;
+        default = "qui";
+        example = "torrents";
+        description = "Group to run qui as.";
+      };
+
+      openFirewall = mkOption {
+        type = bool;
+        default = false;
+        description = "Whether or not to open ports in the firewall for qui.";
+      };
+
+      secretFile = mkOption {
+        type = path;
+        example = "/run/secrets/qui-session.txt";
+        description = ''
+          Path to a file that contains the session secret. The session secret
+          can be generated with `openssl rand -hex 32`.
+        '';
+      };
+
+      settings = mkOption {
+        default = { };
+        example = {
+          port = 7777;
+          logLevel = "DEBUG";
+          metricsEnabled = true;
+        };
+        type = submodule {
+          freeformType = configFormat.type;
+          options = {
+            host = mkOption {
+              type = str;
+              default = "127.0.0.1";
+              description = "The host address qui listens on.";
+            };
+
+            port = mkOption {
+              type = port;
+              default = 7476;
+              description = "The port qui listens on.";
+            };
+          };
+        };
+        description = ''
+          qui configuration options.
+
+          Refer to the [template config](https://github.com/autobrr/qui/blob/main/internal/config/config.go)
+          in the source code for the available options.
+          The documentation contains the available [environment variables](https://getqui.com/docs/configuration/environment/),
+          this can be used to get an overview.
+        '';
+      };
+
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = !(cfg.settings ? sessionSecret);
+        message = ''
+          Session secrets should not be passed via settings, as
+          these are stored in the world-readable nix store.
+
+          Use the secretFile option instead.'';
+      }
+    ];
+
+    systemd.services.qui = {
+      description = "qui: alternative qBittorrent webUI";
+      after = [ "network-online.target" ];
+      wants = [ "network-online.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = {
+        Type = "simple";
+        User = cfg.user;
+        Group = cfg.group;
+
+        LoadCredential = "sessionSecret:${cfg.secretFile}";
+        Environment = [ "QUI__SESSION_SECRET_FILE=%d/sessionSecret" ];
+        StateDirectory = "qui";
+
+        ExecStartPre = ''
+          ${pkgs.coreutils}/bin/install -m 600 '${configFile}' '%S/qui/config.toml'
+        '';
+        ExecStart = "${getExe cfg.package} serve --config-dir %S/qui";
+        Restart = "on-failure";
+
+        # Based on qbittorrent and nemorosa hardening settings
+        # Similar to what systemd hardening helper suggests
+        CapabilityBoundingSet = "";
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateNetwork = false;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProcSubset = "pid";
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = "yes";
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectProc = "invisible";
+        # This should allow for hardlinking to torrent client files
+        ProtectSystem = "full";
+        RemoveIPC = true;
+        RestrictAddressFamilies = [
+          "AF_INET"
+          "AF_INET6"
+          "AF_NETLINK"
+          "AF_UNIX"
+        ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [ "@system-service" ];
+      };
+    };
+
+    networking.firewall = mkIf cfg.openFirewall {
+      allowedTCPPorts = [ cfg.settings.port ];
+    };
+
+    users = {
+      users = mkIf (cfg.user == "qui") {
+        qui = {
+          group = cfg.group;
+          description = "qui user";
+          isSystemUser = true;
+          home = stateDir;
+        };
+      };
+
+      groups = mkIf (cfg.group == "qui") {
+        qui = { };
+      };
+    };
+  };
+
+  meta.maintainers = with maintainers; [ undefined-landmark ];
+}