{ config, lib, pkgs, ... }: with lib; let cfg = config.services.libreddit; args = concatStringsSep " " ([ "--port ${toString cfg.port}" "--address ${cfg.address}" ]); in { options = { services.libreddit = { enable = mkEnableOption (lib.mdDoc "Private front-end for Reddit"); package = mkOption { type = types.package; default = pkgs.libreddit; defaultText = literalExpression "pkgs.libreddit"; description = lib.mdDoc "Libreddit package to use."; }; address = mkOption { default = "0.0.0.0"; example = "127.0.0.1"; type = types.str; description = lib.mdDoc "The address to listen on"; }; port = mkOption { default = 8080; example = 8000; type = types.port; description = lib.mdDoc "The port to listen on"; }; openFirewall = mkOption { type = types.bool; default = false; description = lib.mdDoc "Open ports in the firewall for the libreddit web interface"; }; }; }; config = mkIf cfg.enable { systemd.services.libreddit = { description = "Private front-end for Reddit"; wantedBy = [ "multi-user.target" ]; after = [ "network.target" ]; serviceConfig = { DynamicUser = true; ExecStart = "${cfg.package}/bin/libreddit ${args}"; AmbientCapabilities = lib.mkIf (cfg.port < 1024) [ "CAP_NET_BIND_SERVICE" ]; Restart = "on-failure"; RestartSec = "2s"; # Hardening CapabilityBoundingSet = if (cfg.port < 1024) then [ "CAP_NET_BIND_SERVICE" ] else [ "" ]; DeviceAllow = [ "" ]; LockPersonality = true; MemoryDenyWriteExecute = true; PrivateDevices = true; # A private user cannot have process capabilities on the host's user # namespace and thus CAP_NET_BIND_SERVICE has no effect. PrivateUsers = (cfg.port >= 1024); ProcSubset = "pid"; ProtectClock = true; ProtectControlGroups = true; ProtectHome = true; ProtectHostname = true; ProtectKernelLogs = true; ProtectKernelModules = true; ProtectKernelTunables = true; ProtectProc = "invisible"; RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ]; RestrictNamespaces = true; RestrictRealtime = true; RestrictSUIDSGID = true; SystemCallArchitectures = "native"; SystemCallFilter = [ "@system-service" "~@privileged" "~@resources" ]; UMask = "0077"; }; }; networking.firewall = mkIf cfg.openFirewall { allowedTCPPorts = [ cfg.port ]; }; }; }