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|
{ config, lib, pkgs, ... }:
let
cfg = config.orbekk.simple-firewall;
in
{
options = {
orbekk.simple-firewall = {
enable = lib.mkEnableOption "Enable nftables firewall";
allowedUDPPorts = lib.mkOption {
type = lib.types.listOf lib.types.port;
default = [];
description = "List of TCP ports to allow";
};
allowedTCPPorts = lib.mkOption {
type = lib.types.listOf lib.types.port;
default = [];
description = "List of TCP ports to allow";
};
};
};
config = lib.mkIf cfg.enable {
networking.firewall.enable = lib.mkForce false;
networking.nftables.enable = true;
networking.nftables.ruleset =
let
csvPorts = ports: lib.concatStringsSep "," (map toString ports);
in ''
table inet filter {
set allowed_tcp_ports {
type inet_service
${lib.optionalString (cfg.allowedTCPPorts != [])''
elements = {${csvPorts cfg.allowedTCPPorts}}
''}
}
set allowed_udp_ports {
type inet_service
${lib.optionalString (cfg.allowedUDPPorts != [])''
elements = {${csvPorts cfg.allowedUDPPorts}}
''}
}
chain input {
type filter hook input priority 0
iif lo accept
ct state {established, related} accept
ip protocol icmp limit rate 4/second counter accept
ip6 nexthdr ipv6-icmp limit rate 4/second counter accept
tcp dport @allowed_tcp_ports counter accept
udp dport @allowed_udp_ports counter accept
counter drop
}
chain output {
type filter hook output priority 0
counter accept
}
}
'';
};
}
|
