machines/losurdo/networking/nftables.nix

   1 { pkgs, lib, config, machines, ... }:
   2 let
   3   inherit (builtins) hasAttr readFile;
   4   inherit (pkgs.lib) unlinesAttrs;
   5   inherit (config.users) users groups;
   6 in
   7 {
   8 networking.firewall.enable = false;
   9 security.lockKernelModules = false;
  10 systemd.services.disable-kernel-module-loading.after = [ "nftables.service" ];
  11 # echo -e "$(nix eval machines.losurdo.config.networking.nftables.ruleset)"
  12 # nft list ruleset
  13 systemd.services.nftables.serviceConfig.TimeoutStartSec = "20";
  14 networking.nftables = {
  15   enable = true;
  16   ruleset = lib.mkBefore ''
  17     table inet filter {
  18       chain net2fw {
  19         # Some .nix append rules here with: add rule inet filter net2fw ...
  20       }
  21       chain fw2net {
  22         tcp dport {80,443} counter accept comment "HTTP"
  23         udp dport 123 skuid ${users.systemd-timesync.name} counter accept comment "NTP"
  24         tcp dport 9418 counter accept comment "Git"
  25
  26         # Some .nix append rules here with: add rule inet filter fw2net ...
  27       }
  28       chain intra2fw {
  29         # Some .nix append rules here with: add rule inet filter intra2fw ...
  30       }
  31       chain fw2intra {
  32         # Some .nix append rules here with: add rule inet filter fw2intra ...
  33       }
  34       chain fwd-intra {
  35         # Some .nix append rules here with: add rule inet filter fwd-intra ...
  36       }
  37
  38       chain input {
  39         type filter hook input priority 0
  40         policy drop
  41
  42         iifname lo accept
  43
  44         # accept traffic already established
  45         ct state {established, related} accept
  46         ct state invalid drop
  47
  48         # admin services
  49         tcp dport 22 counter accept comment "SSH"
  50         udp dport 60000-61000 counter accept comment "Mosh"
  51
  52         # ICMP
  53         ip6 nexthdr icmpv6 icmpv6 type { destination-unreachable, packet-too-big, time-exceeded, parameter-problem, nd-router-advert, nd-neighbor-solicit, nd-neighbor-advert, mld-listener-query, nd-router-solicit } accept
  54         ip protocol icmp   icmp   type { destination-unreachable, router-advertisement, time-exceeded, parameter-problem } accept
  55
  56         # allow "ping"
  57         ip6 nexthdr icmpv6 icmpv6 type echo-request accept
  58         ip protocol icmp   icmp   type echo-request accept
  59
  60         # Some .nix append gotos here with: add rule inet filter input iffname ... goto ...
  61       }
  62       chain output {
  63         type filter hook output priority 0
  64         policy drop
  65
  66         oifname lo accept
  67
  68         ct state {related,established} accept
  69         ct state invalid drop
  70
  71         icmp type echo-request counter accept comment "Ping"
  72         tcp dport 22 counter accept comment "SSH"
  73
  74         # Some .nix append gotos here with: add rule inet filter output oifname ... goto ...
  75       }
  76       chain forward {
  77         type filter hook forward priority 0
  78         policy drop
  79       }
  80     }
  81   '';
  82 };
  83 }