nix/nixos/hosts/osaka-linode-01/firewall.nix

{ config, lib, pkgs, ... }: {
  networking.firewall.allowedUDPPorts = [
    3478  # Headscale DERP UDP
    10000 # Jitsi
  ];
  networking.firewall.allowedTCPPorts = [
    80    # HTTP
    443   # HTTPS
    # 25    # SMTP  (explicit TLS => STARTTLS)
    # 465   # ESMTP (implicit TLS)
    # 587   # ESMTP (explicit TLS => STARTTLS)
    # 143   # IMAP4 (explicit TLS => STARTTLS)
    # 993   # IMAP4 (implicit TLS)
    # 4190  # Sieve support
    42420 # Vintage Story
    25565 # Minecraft
    1443  # Headscale DERP
    # 4443  # jitsi-jvb
    # 5222  # Jitsi
    # 5347  # Jitsi
    # 5280  # Jitsi
  ];

  networking.nat = {
    enable = true;
    internalInterfaces = [ "enp0s4" ];
    externalInterface = "wireguard0"
    forwardPorts =  [
      { # Headscale DERP UDP
        destination = "10.100.0.2:3478";
        proto = "udp";
        sourcePort = 3478;
      }
      { # Jitsi
        destination = "10.100.0.2:10000";
        proto = "udp";
        sourcePort = 10000;
      }
      { # HTTP
        destination = "10.100.0.2:80";
        proto = "tcp";
        sourcePort = 80;
      }
      { # HTTPS
        destination = "10.100.0.2:443";
        proto = "tcp";
        sourcePort = 443;
      }
      { # Vintage Story
        destination = "10.100.0.2:42420";
        proto = "tcp";
        sourcePort = 42420;
      }
      { # Minecraft
        destination = "10.100.0.2:25565";
        proto = "tcp";
        sourcePort = 25565;
      }
      { # Headscale DERP TCP
        destination = "10.100.0.2:1443";
        proto = "tcp";
        sourcePort = 1443;
      }
    ];
  };
}