bangs/module.nix

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{ config, lib, pkgs, ... }:
let
cfg = config.services.bang-evaluator;
in
{
options.services.bang-evaluator = {
enable = lib.mkEnableOption "bang-evaluator";
package = lib.mkOption {
type = lib.types.package;
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default = pkgs.bang-evaluator;
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example = "pkgs.bang-exporter-fork";
description = "The package to use for bang-exporter";
};
listenAddress = lib.mkOption {
type = lib.types.str;
default = ":8081";
example = "localhost:8081";
description = "The address bang-evaluator should listen on.";
};
};
config = {
systemd.services.bang-evaluator = lib.mkIf cfg.enable {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
environment = {
BANG_EVALUATOR_LISTEN_ADDRESS = cfg.listenAddress;
};
serviceConfig = {
ExecStart = "${cfg.package}/bin/evaluator";
Restart = "always";
# taken from systemd-analyze --no-pager security bang-evaluator.service
# probably overkill
CapabilityBoundingSet = null;
DynamicUser = true;
LockPersonality = true;
MemoryDenyWriteExecute = true;
PrivateDevices = true;
PrivateUsers = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
RestrictNamespaces = true;
RestrictRealtime = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
};
};
};
}