497 lines
21 KiB
Nix
497 lines
21 KiB
Nix
{ config, lib, pkgs, options, ... }:
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with lib;
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let
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cfg = config.services.transmission;
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opt = options.services.transmission;
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inherit (config.environment) etc;
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apparmor = config.security.apparmor;
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rootDir = "/run/transmission";
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settingsDir = ".config/transmission-daemon";
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downloadsDir = "Downloads";
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incompleteDir = ".incomplete";
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watchDir = "watchdir";
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settingsFormat = pkgs.formats.json {};
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settingsFile = settingsFormat.generate "settings.json" cfg.settings;
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in
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{
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imports = [
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(mkRenamedOptionModule ["services" "transmission" "port"]
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["services" "transmission" "settings" "rpc-port"])
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(mkAliasOptionModule ["services" "transmission" "openFirewall"]
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["services" "transmission" "openPeerPorts"])
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];
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options = {
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services.transmission = {
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enable = mkEnableOption (lib.mdDoc "transmission") // {
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description = lib.mdDoc ''
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Whether to enable the headless Transmission BitTorrent daemon.
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Transmission daemon can be controlled via the RPC interface using
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transmission-remote, the WebUI (http://127.0.0.1:9091/ by default),
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or other clients like stig or tremc.
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Torrents are downloaded to [](#opt-services.transmission.home)/${downloadsDir} by default and are
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accessible to users in the "transmission" group.
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'';
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};
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settings = mkOption {
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description = lib.mdDoc ''
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Settings whose options overwrite fields in
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`.config/transmission-daemon/settings.json`
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(each time the service starts).
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See [Transmission's Wiki](https://github.com/transmission/transmission/wiki/Editing-Configuration-Files)
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for documentation of settings not explicitly covered by this module.
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'';
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default = {};
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type = types.submodule {
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freeformType = settingsFormat.type;
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options.download-dir = mkOption {
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type = types.path;
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default = "${cfg.home}/${downloadsDir}";
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defaultText = literalExpression ''"''${config.${opt.home}}/${downloadsDir}"'';
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description = lib.mdDoc "Directory where to download torrents.";
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};
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options.incomplete-dir = mkOption {
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type = types.path;
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default = "${cfg.home}/${incompleteDir}";
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defaultText = literalExpression ''"''${config.${opt.home}}/${incompleteDir}"'';
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description = lib.mdDoc ''
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When enabled with
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services.transmission.home
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[](#opt-services.transmission.settings.incomplete-dir-enabled),
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new torrents will download the files to this directory.
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When complete, the files will be moved to download-dir
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[](#opt-services.transmission.settings.download-dir).
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'';
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};
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options.incomplete-dir-enabled = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc "";
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};
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options.message-level = mkOption {
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type = types.ints.between 0 3;
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default = 2;
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description = lib.mdDoc "Set verbosity of transmission messages.";
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};
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options.peer-port = mkOption {
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type = types.port;
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default = 51413;
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description = lib.mdDoc "The peer port to listen for incoming connections.";
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};
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options.peer-port-random-high = mkOption {
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type = types.port;
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default = 65535;
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description = lib.mdDoc ''
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The maximum peer port to listen to for incoming connections
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when [](#opt-services.transmission.settings.peer-port-random-on-start) is enabled.
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'';
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};
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options.peer-port-random-low = mkOption {
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type = types.port;
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default = 65535;
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description = lib.mdDoc ''
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The minimal peer port to listen to for incoming connections
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when [](#opt-services.transmission.settings.peer-port-random-on-start) is enabled.
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'';
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};
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options.peer-port-random-on-start = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc "Randomize the peer port.";
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};
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options.rpc-bind-address = mkOption {
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type = types.str;
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default = "127.0.0.1";
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example = "0.0.0.0";
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description = lib.mdDoc ''
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Where to listen for RPC connections.
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Use `0.0.0.0` to listen on all interfaces.
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'';
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};
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options.rpc-port = mkOption {
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type = types.port;
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default = 9091;
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description = lib.mdDoc "The RPC port to listen to.";
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};
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options.script-torrent-done-enabled = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether to run
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[](#opt-services.transmission.settings.script-torrent-done-filename)
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at torrent completion.
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'';
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};
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options.script-torrent-done-filename = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = lib.mdDoc "Executable to be run at torrent completion.";
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};
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options.umask = mkOption {
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type = types.int;
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default = 2;
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description = lib.mdDoc ''
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Sets transmission's file mode creation mask.
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See the umask(2) manpage for more information.
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Users who want their saved torrents to be world-writable
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may want to set this value to 0.
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Bear in mind that the json markup language only accepts numbers in base 10,
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so the standard umask(2) octal notation "022" is written in settings.json as 18.
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'';
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};
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options.utp-enabled = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to enable [Micro Transport Protocol (µTP)](http://en.wikipedia.org/wiki/Micro_Transport_Protocol).
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'';
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};
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options.watch-dir = mkOption {
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type = types.path;
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default = "${cfg.home}/${watchDir}";
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defaultText = literalExpression ''"''${config.${opt.home}}/${watchDir}"'';
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description = lib.mdDoc "Watch a directory for torrent files and add them to transmission.";
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};
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options.watch-dir-enabled = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''Whether to enable the
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[](#opt-services.transmission.settings.watch-dir).
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'';
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};
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options.trash-original-torrent-files = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''Whether to delete torrents added from the
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[](#opt-services.transmission.settings.watch-dir).
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'';
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};
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};
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};
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package = mkPackageOption pkgs "transmission" {};
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downloadDirPermissions = mkOption {
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type = with types; nullOr str;
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default = null;
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example = "770";
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description = lib.mdDoc ''
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If not `null`, is used as the permissions
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set by `systemd.activationScripts.transmission-daemon`
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on the directories [](#opt-services.transmission.settings.download-dir),
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[](#opt-services.transmission.settings.incomplete-dir).
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and [](#opt-services.transmission.settings.watch-dir).
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Note that you may also want to change
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[](#opt-services.transmission.settings.umask).
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'';
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};
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home = mkOption {
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type = types.path;
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default = "/var/lib/transmission";
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description = lib.mdDoc ''
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The directory where Transmission will create `${settingsDir}`.
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as well as `${downloadsDir}/` unless
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[](#opt-services.transmission.settings.download-dir) is changed,
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and `${incompleteDir}/` unless
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[](#opt-services.transmission.settings.incomplete-dir) is changed.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "transmission";
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description = lib.mdDoc "User account under which Transmission runs.";
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};
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group = mkOption {
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type = types.str;
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default = "transmission";
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description = lib.mdDoc "Group account under which Transmission runs.";
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};
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credentialsFile = mkOption {
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type = types.path;
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description = lib.mdDoc ''
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Path to a JSON file to be merged with the settings.
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Useful to merge a file which is better kept out of the Nix store
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to set secret config parameters like `rpc-password`.
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'';
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default = "/dev/null";
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example = "/var/lib/secrets/transmission/settings.json";
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};
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extraFlags = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "--log-debug" ];
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description = lib.mdDoc ''
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Extra flags passed to the transmission command in the service definition.
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'';
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};
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openPeerPorts = mkEnableOption (lib.mdDoc "opening of the peer port(s) in the firewall");
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openRPCPort = mkEnableOption (lib.mdDoc "opening of the RPC port in the firewall");
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performanceNetParameters = mkEnableOption (lib.mdDoc "performance tweaks") // {
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description = lib.mdDoc ''
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Whether to enable tweaking of kernel parameters
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to open many more connections at the same time.
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Note that you may also want to increase
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`peer-limit-global`.
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And be aware that these settings are quite aggressive
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and might not suite your regular desktop use.
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For instance, SSH sessions may time out more easily.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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# Note that using systemd.tmpfiles would not work here
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# because it would fail when creating a directory
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# with a different owner than its parent directory, by saying:
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# Detected unsafe path transition /home/foo → /home/foo/Downloads during canonicalization of /home/foo/Downloads
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# when /home/foo is not owned by cfg.user.
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# Note also that using an ExecStartPre= wouldn't work either
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# because BindPaths= needs these directories before.
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system.activationScripts = mkIf (cfg.downloadDirPermissions != null)
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{ transmission-daemon = ''
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install -d -m 700 '${cfg.home}/${settingsDir}'
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chown -R '${cfg.user}:${cfg.group}' ${cfg.home}/${settingsDir}
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install -d -m '${cfg.downloadDirPermissions}' -o '${cfg.user}' -g '${cfg.group}' '${cfg.settings.download-dir}'
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'' + optionalString cfg.settings.incomplete-dir-enabled ''
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install -d -m '${cfg.downloadDirPermissions}' -o '${cfg.user}' -g '${cfg.group}' '${cfg.settings.incomplete-dir}'
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'' + optionalString cfg.settings.watch-dir-enabled ''
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install -d -m '${cfg.downloadDirPermissions}' -o '${cfg.user}' -g '${cfg.group}' '${cfg.settings.watch-dir}'
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'';
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};
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systemd.services.transmission = {
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description = "Transmission BitTorrent Service";
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after = [ "network.target" ] ++ optional apparmor.enable "apparmor.service";
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requires = optional apparmor.enable "apparmor.service";
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wantedBy = [ "multi-user.target" ];
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environment.CURL_CA_BUNDLE = etc."ssl/certs/ca-certificates.crt".source;
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serviceConfig = {
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# Use "+" because credentialsFile may not be accessible to User= or Group=.
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ExecStartPre = [("+" + pkgs.writeShellScript "transmission-prestart" ''
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set -eu${lib.optionalString (cfg.settings.message-level >= 3) "x"}
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${pkgs.jq}/bin/jq --slurp add ${settingsFile} '${cfg.credentialsFile}' |
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install -D -m 600 -o '${cfg.user}' -g '${cfg.group}' /dev/stdin \
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'${cfg.home}/${settingsDir}/settings.json'
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'')];
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ExecStart="${cfg.package}/bin/transmission-daemon -f -g ${cfg.home}/${settingsDir} ${escapeShellArgs cfg.extraFlags}";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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User = cfg.user;
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Group = cfg.group;
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# Create rootDir in the host's mount namespace.
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RuntimeDirectory = [(baseNameOf rootDir)];
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RuntimeDirectoryMode = "755";
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# This is for BindPaths= and BindReadOnlyPaths=
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# to allow traversal of directories they create in RootDirectory=.
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UMask = "0066";
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# Using RootDirectory= makes it possible
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# to use the same paths download-dir/incomplete-dir
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# (which appear in user's interfaces) without requiring cfg.user
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# to have access to their parent directories,
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# by using BindPaths=/BindReadOnlyPaths=.
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# Note that TemporaryFileSystem= could have been used instead
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# but not without adding some BindPaths=/BindReadOnlyPaths=
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# that would only be needed for ExecStartPre=,
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# because RootDirectoryStartOnly=true would not help.
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RootDirectory = rootDir;
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RootDirectoryStartOnly = true;
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MountAPIVFS = true;
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BindPaths =
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[ "${cfg.home}/${settingsDir}"
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cfg.settings.download-dir
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] ++
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optional cfg.settings.incomplete-dir-enabled
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cfg.settings.incomplete-dir ++
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optional (cfg.settings.watch-dir-enabled && cfg.settings.trash-original-torrent-files)
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cfg.settings.watch-dir;
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BindReadOnlyPaths = [
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# No confinement done of /nix/store here like in systemd-confinement.nix,
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# an AppArmor profile is provided to get a confinement based upon paths and rights.
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builtins.storeDir
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"/etc"
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"/run"
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] ++
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optional (cfg.settings.script-torrent-done-enabled &&
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cfg.settings.script-torrent-done-filename != null)
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cfg.settings.script-torrent-done-filename ++
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optional (cfg.settings.watch-dir-enabled && !cfg.settings.trash-original-torrent-files)
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cfg.settings.watch-dir;
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StateDirectory = [
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"transmission"
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"transmission/.config/transmission-daemon"
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"transmission/.incomplete"
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"transmission/Downloads"
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"transmission/watch-dir"
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];
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StateDirectoryMode = mkDefault 750;
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# The following options are only for optimizing:
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# systemd-analyze security transmission
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AmbientCapabilities = "";
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CapabilityBoundingSet = "";
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# ProtectClock= adds DeviceAllow=char-rtc r
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DeviceAllow = "";
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateMounts = true;
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PrivateNetwork = mkDefault false;
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PrivateTmp = true;
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PrivateUsers = true;
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ProtectClock = true;
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ProtectControlGroups = true;
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# ProtectHome=true would not allow BindPaths= to work across /home,
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# and ProtectHome=tmpfs would break statfs(),
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# preventing transmission-daemon to report the available free space.
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# However, RootDirectory= is used, so this is not a security concern
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# since there would be nothing in /home but any BindPaths= wanted by the user.
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ProtectHome = "read-only";
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectSystem = "strict";
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RemoveIPC = true;
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# AF_UNIX may become usable one day:
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# https://github.com/transmission/transmission/issues/441
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RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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SystemCallFilter = [
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"@system-service"
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# Groups in @system-service which do not contain a syscall
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# listed by perf stat -e 'syscalls:sys_enter_*' transmission-daemon -f
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# in tests, and seem likely not necessary for transmission-daemon.
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"~@aio" "~@chown" "~@keyring" "~@memlock" "~@resources" "~@setuid" "~@timer"
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# In the @privileged group, but reached when querying infos through RPC (eg. with stig).
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"quotactl"
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];
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SystemCallArchitectures = "native";
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};
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};
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# It's useful to have transmission in path, e.g. for remote control
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environment.systemPackages = [ cfg.package ];
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users.users = optionalAttrs (cfg.user == "transmission") ({
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transmission = {
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group = cfg.group;
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uid = config.ids.uids.transmission;
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description = "Transmission BitTorrent user";
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home = cfg.home;
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};
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});
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users.groups = optionalAttrs (cfg.group == "transmission") ({
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transmission = {
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gid = config.ids.gids.transmission;
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};
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});
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networking.firewall = mkMerge [
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(mkIf cfg.openPeerPorts (
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if cfg.settings.peer-port-random-on-start
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then
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{ allowedTCPPortRanges =
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[ { from = cfg.settings.peer-port-random-low;
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to = cfg.settings.peer-port-random-high;
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}
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];
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allowedUDPPortRanges =
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[ { from = cfg.settings.peer-port-random-low;
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to = cfg.settings.peer-port-random-high;
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}
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];
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}
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else
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{ allowedTCPPorts = [ cfg.settings.peer-port ];
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allowedUDPPorts = [ cfg.settings.peer-port ];
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}
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))
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(mkIf cfg.openRPCPort { allowedTCPPorts = [ cfg.settings.rpc-port ]; })
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];
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boot.kernel.sysctl = mkMerge [
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# Transmission uses a single UDP socket in order to implement multiple uTP sockets,
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# and thus expects large kernel buffers for the UDP socket,
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# https://trac.transmissionbt.com/browser/trunk/libtransmission/tr-udp.c?rev=11956.
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# at least up to the values hardcoded here:
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(mkIf cfg.settings.utp-enabled {
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"net.core.rmem_max" = mkDefault 4194304; # 4MB
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"net.core.wmem_max" = mkDefault "1048576"; # 1MB
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})
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(mkIf cfg.performanceNetParameters {
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# Increase the number of available source (local) TCP and UDP ports to 49151.
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# Usual default is 32768 60999, ie. 28231 ports.
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# Find out your current usage with: ss -s
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"net.ipv4.ip_local_port_range" = mkDefault "16384 65535";
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# Timeout faster generic TCP states.
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# Usual default is 600.
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# Find out your current usage with: watch -n 1 netstat -nptuo
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"net.netfilter.nf_conntrack_generic_timeout" = mkDefault 60;
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# Timeout faster established but inactive connections.
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# Usual default is 432000.
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"net.netfilter.nf_conntrack_tcp_timeout_established" = mkDefault 600;
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# Clear immediately TCP states after timeout.
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# Usual default is 120.
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"net.netfilter.nf_conntrack_tcp_timeout_time_wait" = mkDefault 1;
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# Increase the number of trackable connections.
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# Usual default is 262144.
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# Find out your current usage with: conntrack -C
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"net.netfilter.nf_conntrack_max" = mkDefault 1048576;
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})
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];
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security.apparmor.policies."bin.transmission-daemon".profile = ''
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include "${cfg.package.apparmor}/bin.transmission-daemon"
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'';
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security.apparmor.includes."local/bin.transmission-daemon" = ''
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r ${config.systemd.services.transmission.environment.CURL_CA_BUNDLE},
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owner rw ${cfg.home}/${settingsDir}/**,
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rw ${cfg.settings.download-dir}/**,
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${optionalString cfg.settings.incomplete-dir-enabled ''
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rw ${cfg.settings.incomplete-dir}/**,
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''}
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${optionalString cfg.settings.watch-dir-enabled ''
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r${optionalString cfg.settings.trash-original-torrent-files "w"} ${cfg.settings.watch-dir}/**,
|
|
''}
|
|
profile dirs {
|
|
rw ${cfg.settings.download-dir}/**,
|
|
${optionalString cfg.settings.incomplete-dir-enabled ''
|
|
rw ${cfg.settings.incomplete-dir}/**,
|
|
''}
|
|
${optionalString cfg.settings.watch-dir-enabled ''
|
|
r${optionalString cfg.settings.trash-original-torrent-files "w"} ${cfg.settings.watch-dir}/**,
|
|
''}
|
|
}
|
|
|
|
${optionalString (cfg.settings.script-torrent-done-enabled &&
|
|
cfg.settings.script-torrent-done-filename != null) ''
|
|
# Stack transmission_directories profile on top of
|
|
# any existing profile for script-torrent-done-filename
|
|
# FIXME: to be tested as I'm not sure it works well with NoNewPrivileges=
|
|
# https://gitlab.com/apparmor/apparmor/-/wikis/AppArmorStacking#seccomp-and-no_new_privs
|
|
px ${cfg.settings.script-torrent-done-filename} -> &@{dirs},
|
|
''}
|
|
'';
|
|
};
|
|
|
|
meta.maintainers = with lib.maintainers; [ julm ];
|
|
}
|