nix-config/nixos/common.nix

{ config, pkgs, ... }:

{
  nix = {
    package = pkgs.nixUnstable;
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
    optimise.automatic = true;
  };

  # boot.binfmt.emulatedSystems = [ "aarch64-linux" "qemu-aarch64" ];

  networking = {
    networkmanager = {
      enable = true;
      wifi = { scanRandMacAddress = false; };
    };

    useDHCP = false;
    interfaces = { };

    firewall = {

      # 51820 is used by wireguard
      allowedUDPPorts = [ 51820 ];

      # 1714 - 1764 is used by kdeconnect
      allowedTCPPortRanges = [{
        from = 1714;
        to = 1764;
      }];
      allowedUDPPortRanges = [{
        from = 1714;
        to = 1764;
      }];

      # if packets are still dropped, they will show up in dmesg
      logReversePathDrops = true;
      # wireguard trips rpfilter up
      extraCommands = ''
        ip46tables -t raw -I nixos-fw-rpfilter -p udp -m udp --sport 51820 -j RETURN
        ip46tables -t raw -I nixos-fw-rpfilter -p udp -m udp --dport 51820 -j RETURN
      '';
      extraStopCommands = ''
        ip46tables -t raw -D nixos-fw-rpfilter -p udp -m udp --sport 51820 -j RETURN || true
        ip46tables -t raw -D nixos-fw-rpfilter -p udp -m udp --dport 51820 -j RETURN || true
      '';
    };
  };

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

  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";
  console = {
    font = "Lat2-Terminus16";
    keyMap = "us";
  };

  services.dbus.enable = true;

  services.xserver = {
    enable = true;
    layout = "us";
    xkbVariant = "altgr-intl";
    xkbOptions = "caps:escape";
    displayManager.startx.enable = true;
    libinput.enable = true;
    extraConfig = ''
      Section "InputClass"
        Identifier "trackball"
        MatchProduct "Clearly Superior Technologies. CST Laser Trackball"
        Driver "libinput"
        Option "ButtonMapping" "3 2 1 4 5"
        Option "AccelerationProfile" "0"
        Option "AccelerationScheme" "predictable"
        Option "AccelerationNumerator" "3"
        Option "AccelSpeed" "-0.9"
      EndSection
    '';
  };

  services.tor.enable = true;

  services.udev = { packages = [ pkgs.android-udev-rules ]; };

  services.avahi.enable = true;

  # Enable CUPS to print documents.
  # services.printing.enable = true;

  # Enable sound.
  # sound.enable = true;
  # hardware.pulseaudio.enable = true;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa = {
      enable = true;
      support32Bit = true;
    };
    pulse.enable = true;
    jack.enable = true;
  };

  services.snapper.configs = {
    persist = {
      subvolume = "/persist";
      fstype = "btrfs";
      extraConfig = ''
        TIMELINE_CREATE=yes
        TIMELINE_CLEANUP=yes
      '';
    };
    data = {
      subvolume = "/data";
      fstype = "btrfs";
      extraConfig = ''
        TIMELINE_CREATE=yes
        TIMELINE_CLEANUP=yes
      '';

    };
  };

  security.doas = {
    enable = true;
    extraRules = [{
      groups = [ "wheel" ];
      keepEnv = true;
      noPass = true;
    }];
  };
  security.sudo.enable = true;

  security.pam.services = {
    swaylock.text = ''
      auth include login
    '';
    login = {
      allowNullPassword = true;
      setEnvironment = true;
      setLoginUid = true;
      startSession = true;
      unixAuth = true;
      updateWtmp = true;

      # Unlock keyring on login.
      enableGnomeKeyring = true;
    };
  };

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  # environment.systemPackages = with pkgs; [
  #   vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
  #   wget
  #   firefox
  # ];
  environment.systemPackages = with pkgs; [ dmidecode flashrom git ];

  # Enable touchpad support (enabled default in most desktopManager).

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users = {
    mutableUsers = false;
    groups = { plugdev = { }; };
    users = {
      root.initialHashedPassword =
        "$6$3TVh31LfZQFaZi8T$9.cNxrApCaAetC8wRJXxA5U9n4Hbta3CoggvG0HntTQ6sCRQWIV01EhIjdzJoZZ1kqF2ItWkF8Sqprl5raUKY0";
      rilla = {
        uid = 1000;
        isNormalUser = true;
        shell = pkgs.zsh;
        extraGroups = [
          "wheel"
          "docker"
          "libvirtd"
          "dialout"
          "plugdev"
          "adbusers"
          "video"
        ];
        initialHashedPassword =
          "$6$tzMk5I1KZlx7byaO$BvlSz7Cgo1g09e4RpxAjrZEuCptzjibF8nDWDfnOImTbz61Py/qzATDAa7HwAC3JyiZxb.2slTb.vA.f25ypd1";
      };
    };
  };

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };
  programs.mosh.enable = true;
  programs.zsh.enable = true;
  programs.slock.enable = true;

  programs.fuse.userAllowOther = true;

  # List services that you want to enable:

  services.pcscd.enable = true;

  services.openssh = {
    enable = true;
    passwordAuthentication = false;
    permitRootLogin = "no";

    hostKeys = [{
      path = "/etc/ssh/ssh_host_ed25519_key";
      type = "ed25519";
    }];

    knownHosts = {
      "*.monotremata.xyz,10.*,narwhal,suricata,pikvm,caladan,fugu,snitch,trantor,capibara,axolotl,echidna" =
        {
          certAuthority = true;
          publicKey =
            "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHperHwojXZeo3QWAu1f3kiCKeaHHSqBXJM6ZZEefxdd host_ca";
        };
    };

    extraConfig = ''
      HostCertificate /etc/ssh/ssh_host_ed25519_key-cert.pub
      TrustedUserCAKeys /etc/ssh/user_ca.pub
    '';
  };

  virtualisation = {
    docker.enable = true;
    libvirtd.enable = true;
    spiceUSBRedirection.enable = true;
  };
  services.spice-vdagentd.enable = true;
  programs.dconf.enable = true;

  services.udev.extraRules = ''
    # UDEV rules for Teensy USB devices
    ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", ENV{ID_MM_DEVICE_IGNORE}="1"
    ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789A]?", ENV{MTP_NO_PROBE}="1"
    SUBSYSTEMS=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789ABCD]?", MODE:="0666"
    KERNEL=="ttyACM*", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", MODE:="0666"
    ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", MODE="664", GROUP="plugdev"

    # acpi brightness rulres
    ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="acpi_video0", GROUP="video", MODE="0664"
    RUN+="${pkgs.coreutils-full}/bin/chgrp video /sys/class/backlight/intel_backlight/brightness"
    RUN+="${pkgs.coreutils-full}/bin/chmod g+w /sys/class/backlight/intel_backlight/brightness"
  '';

  hardware.opengl.enable = true;
  hardware.bluetooth.enable = true;
  services.blueman.enable = true;

  fileSystems = {
    "/" = {
      device = "tmpfs";
      fsType = "tmpfs";
      options = [ "defaults" "size=2G" "mode=755" ];
    };
  };

  swapDevices = [{ device = "/swap/swapfile"; }];

  environment.persistence = {
    "/persist" = {
      directories = [
        "/etc/NetworkManager/system-connections"
        "/etc/nixos"
        "/etc/wireguard"
        "/var/lib/bluetooth"
        "/var/lib/docker"
        "/var/lib/libvirt"
        "/var/lib/systemd/coredump"
      ];
      files = [
        "/etc/machine-id"
        "/etc/ssh/ssh_host_ed25519_key"
        "/etc/ssh/ssh_host_ed25519_key.pub"
        "/etc/ssh/ssh_host_ed25519_key-cert.pub"
        "/etc/ssh/user_ca.pub"
      ];
    };

    "/logs" = { directories = [ "/var/log" ]; };
  };

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  #
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "21.05"; # Did you read the comment?
}