86 lines
3 KiB
Nix
86 lines
3 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) types;
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cfg = config.services.croc;
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rootDir = "/run/croc";
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in
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{
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options.services.croc = {
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enable = lib.mkEnableOption "croc relay";
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ports = lib.mkOption {
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type = with types; listOf port;
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default = [9009 9010 9011 9012 9013];
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description = "Ports of the relay.";
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};
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pass = lib.mkOption {
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type = with types; either path str;
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default = "pass123";
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description = "Password or passwordfile for the relay.";
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};
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openFirewall = lib.mkEnableOption "opening of the peer port(s) in the firewall";
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debug = lib.mkEnableOption "debug logs";
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};
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config = lib.mkIf cfg.enable {
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systemd.services.croc = {
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.croc}/bin/croc --pass '${cfg.pass}' ${lib.optionalString cfg.debug "--debug"} relay --ports ${lib.concatMapStringsSep "," toString cfg.ports}";
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# The following options are only for optimizing:
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# systemd-analyze security croc
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AmbientCapabilities = "";
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CapabilityBoundingSet = "";
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DynamicUser = true;
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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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MountAPIVFS = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateMounts = true;
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PrivateNetwork = lib.mkDefault false;
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PrivateTmp = true;
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PrivateUsers = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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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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ProtectProc = "invisible";
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ProtectSystem = "strict";
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RemoveIPC = true;
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RestrictAddressFamilies = [ "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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RootDirectory = rootDir;
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# Avoid mounting rootDir in the own rootDir of ExecStart='s mount namespace.
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InaccessiblePaths = [ "-+${rootDir}" ];
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BindReadOnlyPaths = [
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builtins.storeDir
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] ++ lib.optional (types.path.check cfg.pass) cfg.pass;
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# This is for BindReadOnlyPaths=
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# to allow traversal of directories they create in RootDirectory=.
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UMask = "0066";
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# Create rootDir in the host's mount namespace.
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RuntimeDirectory = [(baseNameOf rootDir)];
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RuntimeDirectoryMode = "700";
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SystemCallFilter = [
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"@system-service"
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"~@aio" "~@keyring" "~@memlock" "~@privileged" "~@setuid" "~@sync" "~@timer"
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];
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SystemCallArchitectures = "native";
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SystemCallErrorNumber = "EPERM";
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};
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};
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networking.firewall.allowedTCPPorts = lib.mkIf cfg.openFirewall cfg.ports;
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};
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meta.maintainers = with lib.maintainers; [ hax404 julm ];
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}
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