163 lines
5.3 KiB
Nix
163 lines
5.3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.clerie.forward-filter;
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startScript = pkgs.writeScriptBin "forward-filter-start" ''
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#! ${pkgs.runtimeShell} -e
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ip46tables() {
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iptables -w "$@"
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ip6tables -w "$@"
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}
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ip46tables -D FORWARD -j forward-filter 2> /dev/null || true
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ip46tables -F forward-filter 2> /dev/null || true
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ip46tables -X forward-filter 2> /dev/null || true
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ip46tables -N forward-filter
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ip46tables -A forward-filter -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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${concatStrings (mapAttrsToList (iface: ifacecfg: ''
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${concatMapStrings (rule: if (rule.sourceAddress != null || rule.destinationAddress != null ) then ''
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iptables -A forward-filter -o ${iface} ${optionalString (rule.incomingInterface != null) "-i ${rule.incomingInterface}"} ${optionalString (rule.sourceAddress != null) "-s ${rule.sourceAddress}"} ${optionalString (rule.destinationAddress != null) "-d ${rule.destinationAddress}"} ${optionalString (rule.jump != null) "-j ${rule.jump}"}
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'' else if (rule.sourceAddress6 != null || rule.destinationAddress6 != null ) then ''
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ip6tables -A forward-filter -o ${iface} ${optionalString (rule.incomingInterface != null) "-i ${rule.incomingInterface}"} ${optionalString (rule.sourceAddress6 != null) "-s ${rule.sourceAddress6}"} ${optionalString (rule.destinationAddress6 != null) "-d ${rule.destinationAddress6}"} ${optionalString (rule.jump != null) "-j ${rule.jump}"}
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'' else ''
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ip46tables -A forward-filter -o ${iface} ${optionalString (rule.incomingInterface != null) "-i ${rule.incomingInterface}"} ${optionalString (rule.jump != null) "-j ${rule.jump}"}
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''
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) ifacecfg.rules}
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${optionalString (ifacecfg.default != null) ''
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ip46tables -A forward-filter -o ${iface} -j ${ifacecfg.default}
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''}
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'') cfg.interfaces)}
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ip46tables -A FORWARD -j forward-filter
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'';
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stopScript = pkgs.writeScriptBin "forward-filter-stop" ''
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#! ${pkgs.runtimeShell} -e
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ip46tables() {
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iptables -w "$@"
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ip6tables -w "$@"
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}
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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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in
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{
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options = {
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clerie.forward-filter = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description =
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''
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Whether to enable the forward-filter. It gives basic control about
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blocking and allowing forward between interfaces.
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'';
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};
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interfaces = mkOption {
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default = { };
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type = with types; attrsOf (submodule {
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options = {
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rules = mkOption {
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type = with types; listOf (submodule {
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options = {
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sourceAddress = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "192.168.0.0/24";
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description = "";
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};
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sourceAddress6 = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "fd00::/64";
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description = "";
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};
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destinationAddress = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "192.168.0.0/24";
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description = "";
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};
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destinationAddress6 = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "fd00::/64";
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description = "";
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};
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incomingInterface = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "ens18";
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description = "";
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};
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jump = mkOption {
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type = types.nullOr types.str;
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default = "ACCEPT";
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example = "DROP";
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description = "";
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};
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};
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});
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description = "List of rules to filter forwarding.";
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};
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default = mkOption {
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type = types.nullOr types.str;
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default = "DROP";
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example = "ACCEPT";
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description = "";
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};
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};
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});
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description =
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''
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Interface filter options.
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'';
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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 = "@${startScript}/bin/forward-filter-start forward-filter-start";
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ExecStop = "@${stopScript}/bin/forward-filter-stop forward-filter-stop";
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};
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};
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};
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}
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