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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.ferm;
configFile = pkgs.stdenv.mkDerivation {
name = "ferm.conf";
text = cfg.config;
preferLocalBuild = true;
buildCommand = ''
echo -n "$text" > $out
${cfg.package}/bin/ferm --noexec $out
'';
};
in {
options = {
services.ferm = {
enable = mkOption {
default = false;
type = types.bool;
description = ''
Whether to enable Ferm Firewall.
*Warning*: Enabling this service WILL disable the existing NixOS
firewall! Default firewall rules provided by packages are not
considered at the moment.
'';
};
config = mkOption {
description = "Verbatim ferm.conf configuration.";
default = "";
defaultText = "empty firewall, allows any traffic";
type = types.lines;
};
package = mkOption {
description = "The ferm package.";
type = types.package;
default = pkgs.ferm;
defaultText = "pkgs.ferm";
};
};
};
config = mkIf cfg.enable {
systemd.services.firewall.enable = false;
systemd.services.ferm = {
description = "Ferm Firewall";
after = [ "ipset.target" ];
before = [ "network-pre.target" ];
wants = [ "network-pre.target" ];
wantedBy = [ "multi-user.target" ];
reloadIfChanged = true;
serviceConfig = {
Type="oneshot";
RemainAfterExit = "yes";
ExecStart = "${cfg.package}/bin/ferm ${configFile}";
ExecReload = "${cfg.package}/bin/ferm ${configFile}";
ExecStop = "${cfg.package}/bin/ferm -F ${configFile}";
};
};
};
}
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