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|
{
config,
inventory,
self_name,
lib,
...
}:
let
inherit (lib)
mkOption
types
mkIf
mkEnableOption
mkDefault
;
inv = inventory.${self_name};
net = inv.interfaces;
cfg = config.wilkuu.firewall;
portRangeType = types.addCheck (types.submodule {
options = {
from = mkOption {
type = types.port;
example = 100;
description = "lowest part of the range (inclusive)";
};
to = mkOption {
type = types.port;
example = 200;
description = "highest part of the range (inclusive)";
};
};
}) (range: range.from < range.to);
mkPortsOption =
protocol:
mkOption {
type = types.listOf types.port;
default = [ ];
example = [ 1234 ];
description = "List of ${protocol} ports to accept";
};
mkPortRangesOption =
protocol:
mkOption {
type = types.listOf portRangeType;
default = [ ];
example = [ 1234 ];
description = "List of ${protocol} port ranges to accept";
};
layerAssertions = lib.mapAttrsToList (
layerName: layerConfig:
let
missing = builtins.filter (importLayer: !(cfg.layers ? ${importLayer})) layerConfig.import-layer;
in
{
assertion = missing == [ ];
message = "Layer ${layerName} imports undefined layer(s): ${toString missing}";
}
) cfg.layers;
in
{
options.wilkuu.firewall = {
enable = mkEnableOption "firewall module";
defaultLayer = lib.mkOption {
type = types.str;
default = "external";
example = "eth";
};
layers = mkOption {
default = { };
description = "Layers and which ports should be open";
type = types.attrsOf (
types.submodule {
options = {
import-layer = mkOption {
type = types.listOf types.str;
default = [ ];
example = [ "external" ];
description = "Layer names which ports will also be opened on this layer";
};
allowedTCPPorts = mkPortsOption "TCP";
allowedUDPPorts = mkPortsOption "UDP";
allowedTCPPortRanges = mkPortRangesOption "TCP";
allowedUDPPortRanges = mkPortRangesOption "UDP";
};
}
);
};
};
config = mkIf cfg.enable {
assertions = layerAssertions;
networking.nftables.enable = true;
networking.firewall =
let
# TODO: reconsider doing this as this will only do a flat-import anything more complex would require building an import tree.
resolvedLayers = lib.mapAttrs (
_: l1:
lib.foldl' (acc: set2: {
allowedTCPPorts = acc.allowedTCPPorts ++ set2.allowedTCPPorts;
allowedUDPPorts = acc.allowedUDPPorts ++ set2.allowedUDPPorts;
allowedTCPPortRanges = acc.allowedTCPPortRanges ++ set2.allowedTCPPortRanges;
allowedUDPPortRanges = acc.allowedUDPPortRanges ++ set2.allowedUDPPortRanges;
}) l1 (map (lk: cfg.layers.${lk}) l1.import-layer)
) cfg.layers;
interfaces = lib.mapAttrs (_n: interface: {
inherit (resolvedLayers.${interface.layer})
allowedTCPPorts
allowedUDPPorts
allowedTCPPortRanges
allowedUDPPortRanges
;
}) (lib.filterAttrs (_n: interface: !(builtins.elem interface.type [ "roaming" ])) net);
in
{
enable = true;
checkReversePath = mkDefault false;
inherit interfaces;
inherit (resolvedLayers.${cfg.defaultLayer})
allowedTCPPorts
allowedUDPPorts
allowedTCPPortRanges
allowedUDPPortRanges
;
};
};
}
|
