hosts/mermet/networking/wireguard.nix

   1 { pkgs, lib, config, hosts, hostName, wireguard, ... }:
   2 let
   3   inherit (builtins) hasAttr removeAttrs;
   4   inherit (config.security.gnupg) secrets;
   5   wg = "wg-intra";
   6   peers = lib.filterAttrs (peerName: host:
   7     hasAttr "${wg}" host.extraArgs.wireguard
   8     ) (removeAttrs hosts [hostName]);
   9 in
  10 {
  11 security.gnupg.secrets."wireguard/${wg}/privateKey" = {};
  12 systemd.services."wireguard-${wg}" = {
  13   after    = [ secrets."wireguard/${wg}/privateKey".service ];
  14   requires = [ secrets."wireguard/${wg}/privateKey".service ];
  15 };
  16 networking.nftables.ruleset = ''
  17   # Allow peers to initiate connection for ${wg}
  18   add rule inet filter net2fw udp dport ${toString wireguard."${wg}".listenPort} counter accept comment "${wg}"
  19
  20   # Hook ${wg} into relevant chains
  21   add rule inet filter input  iifname "${wg}" jump intra2fw
  22   add rule inet filter input  iifname "${wg}" log level warn prefix "intra2fw: " counter drop
  23   add rule inet filter output oifname "${wg}" jump fw2intra
  24   add rule inet filter output oifname "${wg}" log level warn prefix "fw2intra: " counter drop
  25
  26   # ${wg} firewalling
  27   add rule inet filter fw2intra counter accept
  28   add rule inet filter intra2fw ip saddr ${hosts.losurdo.extraArgs.wireguard."${wg}".ipv4} counter accept comment "losurdo"
  29 '';
  30 networking.wireguard.interfaces."${wg}" = {
  31   ips = [ "${wireguard."${wg}".ipv4}/24" ];
  32   listenPort = wireguard."${wg}".listenPort;
  33   privateKeyFile = secrets."wireguard/${wg}/privateKey".path;
  34   peers = lib.mapAttrsToList (peerName: host: host.extraArgs.wireguard."${wg}".peer) peers;
  35 };
  36 networking.hosts = lib.mapAttrs' (hostName: host: lib.nameValuePair
  37   host.extraArgs.wireguard."${wg}".ipv4
  38   [ "${hostName}.intranet" ]
  39   ) peers;
  40 }