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|
{ cfg, lib, pkgs, ... }:
let
inherit (pkgs) writeScript writeText;
inherit (lib) concatMapStringsSep;
accept-new-tcp = port:
"-p tcp -m tcp --dport ${port} -m conntrack --ctstate NEW -j ACCEPT";
rules = iptables-version:
writeText "tv-iptables-rules${toString iptables-version}" ''
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
${concatMapStringsSep "\n" (rule: "-A PREROUTING ${rule}") ([]
++ [
"! -i retiolum -p tcp -m tcp --dport 22 -j REDIRECT --to-ports 0"
"-p tcp -m tcp --dport 11423 -j REDIRECT --to-ports 22"
]
)}
COMMIT
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
:Retiolum - [0:0]
${concatMapStringsSep "\n" (rule: "-A INPUT ${rule}") ([]
++ [
"-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT"
"-i lo -j ACCEPT"
]
++ map accept-new-tcp cfg.input-internet-accept-new-tcp
++ ["-i retiolum -j Retiolum"]
)}
${concatMapStringsSep "\n" (rule: "-A Retiolum ${rule}") ([]
++ {
ip4tables = [
"-p icmp -m icmp --icmp-type echo-request -j ACCEPT"
];
ip6tables = [
"-p ipv6-icmp -m icmp6 --icmpv6-type echo-request -j ACCEPT"
];
}."ip${toString iptables-version}tables"
++ map accept-new-tcp cfg.input-retiolum-accept-new-tcp
++ {
ip4tables = [
"-p tcp -j REJECT --reject-with tcp-reset"
"-p udp -j REJECT --reject-with icmp-port-unreachable"
"-j REJECT --reject-with icmp-proto-unreachable"
];
ip6tables = [
"-p tcp -j REJECT --reject-with tcp-reset"
"-p udp -j REJECT --reject-with icmp6-port-unreachable"
"-j REJECT"
];
}."ip${toString iptables-version}tables"
)}
COMMIT
'';
startScript = writeScript "tv-iptables_start" ''
#! /bin/sh
set -euf
iptables-restore < ${rules 4}
ip6tables-restore < ${rules 6}
'';
in
{
networking.firewall.enable = false;
systemd.services.tv-iptables = {
description = "tv-iptables";
wantedBy = [ "network-pre.target" ];
before = [ "network-pre.target" ];
after = [ "systemd-modules-load.service" ];
path = with pkgs; [
iptables
];
restartIfChanged = true;
serviceConfig = {
Type = "simple";
RemainAfterExit = true;
Restart = "always";
ExecStart = "@${startScript} tv-iptables_start";
};
};
}
|
