# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./odin/hw.nix
      ./users.nix
      ./custom/uucp.nix
      ./custom/uucp-mediaserver.nix
      ./custom/lvm-snapshots.nix
    ];

  # Use the GRUB 2 boot loader.
  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  # Define on which hard drive you want to install Grub.
  boot.loader.grub.device = "/dev/disk/by-id/ata-MKNSSDCR60GB_MK130619AS1031770";

  networking.hostName = "odin"; # Define your hostname.

  # Select internationalisation properties.
  i18n = {
    consoleKeyMap = "dvp";
    defaultLocale = "en_US.UTF-8";
  };

  # Set your time zone.
  time.timeZone = "Europe/Berlin";

  environment.systemPackages = with pkgs; [
    pythonPackages.magic-wormhole
    tmux
    mosh
    quota
    git
    (callPackage ./utils/nix/rebuild-system.nix {})
  ];

  programs.zsh.enable = true;

  services.openssh = {
    enable = true;
    passwordAuthentication = false;
    challengeResponseAuthentication = false;
    extraConfig = ''
      AllowGroups ssh
    '';
  };
  users.groups."ssh" = {
    members = ["uucp" "root"];
  };

  networking.firewall = {
    enable = true;
    allowPing = true;
    allowedTCPPorts = [ 22 # ssh
                      ];
    allowedUDPPortRanges = [ { from = 60000; to = 61000; } # mosh
                           ];
  };

  users.extraUsers.root = let
      template = import ./users/gkleen.nix;
    in {
      inherit (template) shell;
      openssh.authorizedKeys.keyFiles = template.openssh.authorizedKeys.keyFiles;
    };

  services.journald = {
    rateLimitBurst = 0;
  };

  services.haveged.enable = true;

  services.uucp = {
    enable = true;
    nodeName = "odin";
    remoteNodes = {
      "ymir" = {
        publicKeys = ["ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGANj+LJ4CI6VrAgBRocKCGq74kZnwD1PdKr/gdlfVr1 uucp@ymir"];
        hostnames = ["ymir.yggdrasil.li" "ymir.niflheim.yggdrasil"];
        commands = ["rmail"];
      };
      "hel" = {
        publicKeys = ["ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKD8ycFGfVkBL9wjA5Kc33cl6Qt5K2505G/38oH8Cy/e uucp@hel"];
        hostnames = ["hel.asgard.yggdrasil" "hel.midgard.yggdrasil"];
        commands = ["rmail"];
      };
    };

    media-server = {
      enable = true;
      remoteNodes = [ "hel" ];
    };

    commandPath = [ "${pkgs.rmail}/bin" ];
  };

  users.groups."media" = {
    members = [ "uucp" ];
  };

  services.postfix = {
    enable = true;
    enableSmtp = false;
    enableSubmission = false;
    setSendmail = true;
    networksStyle = "host";
    hostname = "odin.asgard.yggdrasil";
    recipientDelimiter = "+";
    postmasterAlias = "gkleen";
    rootAlias = "gkleen";
    extraAliases = ''
      uucp: gkleen
    '';

    destination = [''regexp:${pkgs.writeText "destination" ''
        /\.?localdomain$/ ACCEPT
        /^localhost$/ ACCEPT
        /\.?odin(\.asgard\.yggdrasil)?$/ ACCEPT
      ''}''];
    config = {
      default_transport = "uucp:ymir";

      message_size_limit = "0";
      mailbox_size_limit = "0";

      mail_spool_directory = "/srv/mail";

      luser_relay = ''postmaster''${recipient_delimiter}''${local:unknown}'';
    };

    masterConfig = {
      uucp = {
        type = "unix";
        private = true;
        privileged = true;
        chroot = false;
        command = "pipe";
        args = [ "flags=Fqhu" "user=uucp" ''argv=${config.security.wrapperDir}/uux -z -a $sender - $nexthop!rmail ($recipient)'' ];
      };
    };

    networks = ["127.0.0.0/8" "[::ffff:127.0.0.0]/104" "[::1]/128" "10.141.0.0/16"];
  };

  services.lvm-snapshots = {
    snapshots = {
      mail = {
        LV = "mail";
        VG = "raid6";
      };
    };
  };

  system.autoUpgrade.enable = true;
  system.stateVersion = "18.09";

  systemd.services."nixos-upgrade" = {
    path = with pkgs; [ git ];
    preStart = ''
      git -C /etc/nixos pull --recurse-submodules
    '';
  };
}