145 lines
3.6 KiB
Nix
145 lines
3.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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ip46tables = ''
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ip46tables() {
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iptables -w "$@"
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ip6tables -w "$@"
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}
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'';
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cfg = config.clerie.firewall;
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forwardFilterStartScript = pkgs.writeScriptBin "forward-filter-start" ''
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#! ${pkgs.runtimeShell} -e
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${ip46tables}
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ip46tables -D FORWARD -j forward-filter 2> /dev/null || true
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ip46tables -F forward-filter 2> /dev/null || true
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ip46tables -X forward-filter 2> /dev/null || true
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ip46tables -N forward-filter
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${cfg.extraForwardFilterCommands}
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ip46tables -A FORWARD -j forward-filter
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'';
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forwardFilterStopScript = pkgs.writeScriptBin "forward-filter-stop" ''
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#! ${pkgs.runtimeShell} -e
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${ip46tables}
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ip46tables -D FORWARD -j forward-filter 2> /dev/null || true
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ip46tables -F forward-filter 2> /dev/null || true
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ip46tables -X forward-filter 2> /dev/null || true
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'';
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forwardMangleStartScript = pkgs.writeScriptBin "forward-mangle-start" ''
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#! ${pkgs.runtimeShell} -e
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${ip46tables}
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ip46tables -t mangle -D FORWARD -j forward-mangle 2> /dev/null || true
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ip46tables -t mangle -F forward-mangle 2> /dev/null || true
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ip46tables -t mangle -X forward-mangle 2> /dev/null || true
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ip46tables -t mangle -N forward-mangle
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${cfg.extraForwardMangleCommands}
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ip46tables -t mangle -A FORWARD -j forward-mangle
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'';
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forwardMangleStopScript = pkgs.writeScriptBin "forward-mangle-stop" ''
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#! ${pkgs.runtimeShell} -e
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${ip46tables}
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ip46tables -t mangle -D FORWARD -j forward-mangle 2> /dev/null || true
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ip46tables -t mangle -F forward-mangle 2> /dev/null || true
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ip46tables -t mangle -X forward-mangle 2> /dev/null || true
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'';
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in
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{
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options = {
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clerie.firewall = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description =
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''
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Whether to enable the clerie firewall. It provides chains than can get cleanly set up and shut down.
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'';
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};
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extraForwardFilterCommands = mkOption {
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type = types.lines;
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default = "";
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};
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extraForwardMangleCommands = mkOption {
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type = types.lines;
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default = "";
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};
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};
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};
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config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.iptables ];
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systemd.services.forward-filter = {
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description = "Forward Filter";
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wantedBy = [ "sysinit.target" ];
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wants = [ "network-pre.target" ];
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before = [ "network-pre.target" ];
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after = [ "systemd-modules-load.service" ];
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path = [ pkgs.iptables ];
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unitConfig.ConditionCapability = "CAP_NET_ADMIN";
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unitConfig.DefaultDependencies = false;
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = "@${forwardFilterStartScript}/bin/forward-filter-start forward-filter-start";
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ExecStop = "@${forwardFilterStopScript}/bin/forward-filter-stop forward-filter-stop";
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};
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};
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systemd.services.forward-mangle = {
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description = "Forward Mangle";
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wantedBy = [ "sysinit.target" ];
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wants = [ "network-pre.target" ];
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before = [ "network-pre.target" ];
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after = [ "systemd-modules-load.service" ];
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path = [ pkgs.iptables ];
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unitConfig.ConditionCapability = "CAP_NET_ADMIN";
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unitConfig.DefaultDependencies = false;
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = "@${forwardMangleStartScript}/bin/forward-mangle-start forward-mangle-start";
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ExecStop = "@${forwardMangleStopScript}/bin/forward-mangle-stop forward-mangle-stop";
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};
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};
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};
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}
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