tlaternet-server/configuration/services/starbound.nix

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{ pkgs
, lib
, ...
}:
let
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inherit (lib) concatStringsSep;
in
{
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# Sadly, steam-run requires some X libs
environment.noXlibs = false;
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systemd.services.starbound = {
description = "Starbound";
after = [ "network.target" ];
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serviceConfig = {
ExecStart = "${pkgs.local.starbound}/bin/launch-starbound ${./configs/starbound.json}";
Type = "simple";
# Credential loading for steam auth (if necessary; prefer
# anonymous login wherever possible).
LoadCredential = "steam:/run/secrets/steam/tlater";
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# Security settings
DynamicUser = true;
# This is where the StateDirectory ends up
WorkingDirectory = "/var/lib/starbound";
# Creates /var/lib/starbound (or rather, a symlink there to
# /var/lib/private/starbound), and sets it up to be writeable to
# by the dynamic user.
StateDirectory = "starbound";
# Note some settings below are basically tautologous with
# `NoNewPrivileges`, but they all work slightly differently so
# add additional layers in case of bugs.
## THESE SETTINGS ARE A GOOD IDEA BUT THE STEAM CLIENT IS
## REALLY, REALLY BAD, AND FOR SOME REASON I NEED TO USE IT TO
## DOWNLOAD GAME SERVERS AS WELL:
##
# To guarantee the above (only permits 64-bit syscalls, 32-bit
# syscalls can circumvent the above restrictions).
#
# Obviously, if running a 32 bit game server, change this.
# SystemCallArchitectures = "native";
# Game servers shouldn't need to create new namespaces ever.
#
# TODO: Since steam uses namespaces for things *entirely
# unrelated* to installing game servers, we need to allow
# namespace access. Ideally I'd instead do this in an
# ExecStartPre, but alas, this isn't possible because of
# https://github.com/systemd/systemd/issues/19604.
#
# RestrictNamespaces = true;
# Don't need to let the game server see other user accounts
PrivateUsers = true;
# *Probably* not harmful for game servers, which probably don't update dynamically
ProtectHostname = true;
# Yeah, if a game server tries to edit the hardware clock something's fishy
ProtectClock = true;
# Don't let game servers modify kernel settings, duh
ProtectKernelTunables = true;
ProtectKernelModules = true;
ProtectKernelLogs = true;
# Game servers shouldn't use cgroups themselves either
ProtectControlGroups = true;
# Most game servers will never need other socket types
RestrictAddressFamilies = [ "AF_UNIX AF_INET AF_INET6" ];
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# Also a no-brainer, no game server should ever need this
LockPersonality = true;
# Some game servers will probably try to set this, but they
# don't need it. It's only required for audio processing and
# such, which the server end doesn't need to do.
RestrictRealtime = true;
# Don't allow a variety of syscalls that gameservers have no
# business using anyway
SystemCallFilter =
"~"
+ (concatStringsSep " " [
"@clock"
"@cpu-emulation"
"@debug"
"@keyring"
"@memlock"
"@module"
# "@mount" TODO: Consider adding when steamcmd is run in ExecStartPre
"@obsolete"
"@raw-io"
"@reboot"
# "@resources" TODO: Ditto
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"@setuid"
"@swap"
]);
# Normally only "read-only", but steamcmd will puke if there is
# no home directory to write to (though the nix package will
# implicitly symlink to the path that we set in its override, so
# no actual files are created, besides a symlink).
ProtectHome = "tmpfs";
# Implied by DynamicUser anyway, but it doesn't hurt to add
# these explicitly, at least for reference.
RemoveIPC = true;
PrivateTmp = true;
PrivateDevices = true;
NoNewPrivileges = true;
RestrictSUIDSGID = true;
ProtectSystem = "strict";
# ProtectHome = "read-only"; # See further up
};
};
services.backups.starbound = {
user = "root";
paths = [
"/var/lib/private/starbound/storage/universe/"
];
pauseServices = [ "starbound.service" ];
};
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}