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|
{ config, lib, pkgs, ... }:
let
inherit (lib) types;
cfg = config.services.croc;
rootDir = "/run/croc";
in
{
options.services.croc = {
enable = lib.mkEnableOption "croc relay";
ports = lib.mkOption {
type = with types; listOf port;
default = [9009 9010 9011 9012 9013];
description = "Ports of the relay.";
};
pass = lib.mkOption {
type = with types; either path str;
default = "pass123";
description = "Password or passwordfile for the relay.";
};
openFirewall = lib.mkEnableOption "opening of the peer port(s) in the firewall";
debug = lib.mkEnableOption "debug logs";
};
config = lib.mkIf cfg.enable {
systemd.services.croc = {
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
ExecStart = "${pkgs.croc}/bin/croc --pass '${cfg.pass}' ${lib.optionalString cfg.debug "--debug"} relay --ports ${lib.concatMapStringsSep "," toString cfg.ports}";
# The following options are only for optimizing:
# systemd-analyze security croc
AmbientCapabilities = "";
CapabilityBoundingSet = "";
DynamicUser = true;
# ProtectClock= adds DeviceAllow=char-rtc r
DeviceAllow = "";
LockPersonality = true;
MemoryDenyWriteExecute = true;
MountAPIVFS = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateMounts = true;
PrivateNetwork = lib.mkDefault false;
PrivateTmp = true;
PrivateUsers = true;
ProcSubset = "pid";
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProtectSystem = "strict";
RemoveIPC = true;
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
RootDirectory = rootDir;
# Avoid mounting rootDir in the own rootDir of ExecStart='s mount namespace.
InaccessiblePaths = [ "-+${rootDir}" ];
BindReadOnlyPaths = [
builtins.storeDir
] ++ lib.optional (types.path.check cfg.pass) cfg.pass;
# This is for BindReadOnlyPaths=
# to allow traversal of directories they create in RootDirectory=.
UMask = "0066";
# Create rootDir in the host's mount namespace.
RuntimeDirectory = [(baseNameOf rootDir)];
RuntimeDirectoryMode = "700";
SystemCallFilter = [
"@system-service"
"~@aio" "~@keyring" "~@memlock" "~@privileged" "~@resources" "~@setuid" "~@sync" "~@timer"
];
SystemCallArchitectures = "native";
SystemCallErrorNumber = "EPERM";
};
};
networking.firewall.allowedTCPPorts = lib.mkIf cfg.openFirewall cfg.ports;
};
meta.maintainers = with lib.maintainers; [ hax404 julm ];
}
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