# 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, lib, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hel/hw.nix
      ./hel/boot.nix
      ./users.nix
      ./custom/zsh.nix
      ./custom/tinc/def.nix
      ./custom/uucp.nix
    ];

  system.stateVersion = "16.09";

  networking = {
    hostName = "hel";
    
    firewall = {
      enable = true;
      allowedTCPPorts = [ 22 # ssh
                        ];
    };

    networkmanager = {
      enable = true;
    };
  };

  powerManagement.enable = true;

  i18n = {
    consoleFont = "lat9w-16";
    consoleKeyMap = "dvp";
    defaultLocale = "en_US.UTF-8";
  };

  boot.kernelPackages = pkgs.linuxPackages_latest;

  environment.systemPackages = with pkgs; [
    git
    slock
    shadow
    (callPackage ./utils/nix/rebuild-system.nix {})
    rewacom
  ];

  nixpkgs.config.packageOverrides = pkgs: rec {
    rewacom = pkgs.writeScriptBin "rewacom" ''
      #!${pkgs.stdenv.shell}
      modprobe -r wacom
      modprobe wacom
    '';

    samsung-unified-linux-driver = pkgs.stdenv.lib.overrideDerivation pkgs.samsung-unified-linux-driver (oldAttrs: {
      buildInputs = oldAttrs.buildInputs ++ [ pkgs.makeWrapper ];
      builder = pkgs.writeScript "builder.sh" ''
        #!${pkgs.stdenv.shell}

        source ${pkgs.stdenv}/setup

        ${oldAttrs.builder} ${pkgs.lib.concatStringsSep " " oldAttrs.args}

        export PATH=${pkgs.makeWrapper}/bin:$PATH
      
        echo "Wrapping samsung filters"
        wrapProgram $out/lib/cups/filter/rastertosamsungspl \
          --prefix PATH : ${pkgs.ghostscript}/bin
        wrapProgram $out/lib/cups/filter/rastertosamsungsplc \
          --prefix PATH : ${pkgs.ghostscript}/bin
      '';
    });
  };

  # nixpkgs.config.packageOverrides = pkgs: rec {
  #   libqmi = pkgs.stdenv.lib.overrideDerivation pkgs.libqmi (old: {
  #     src = pkgs.fetchgit {
  #       url = "git://anongit.freedesktop.org/libqmi";
  # 	rev = "7a426340c9238f743b4641096ea86b89dd503041";
  # 	sha256 = "1lnr049hjakp864kq2lql04nfraaxgfh88rjayc7a7x993s75fzs";
  #     };

  #     buildInputs = old.buildInputs ++ (with pkgs; [ libmbim automake114x ]);
  #   });
  #   libmbim = pkgs.stdenv.lib.overrideDerivation pkgs.libmbim (old: {
  #     src = pkgs.fetchgit {
  #       url = "git://anongit.freedesktop.org/libmbim/libmbim";
  # 	rev = "c5ed53cfabc0d7ba20dea1047db718f2ca0a6d80";
  # 	sha256 = "07fy120703rwpf7p0d8fdbrswx9jn1ln8wnnn7zkwwjq9mgr6ppp";
  #     };
      
  #     buildInputs = old.buildInputs ++ (with pkgs; [ autoconf automake gnome.gtkdoc libtool pkgconfig ]);

  #     preConfigure = "./autogen.sh";
  #   });
  # };

  nixpkgs.config.allowUnfree = true;

  services = {
    logind.extraConfig = ''
      HandleLidSwitch=sleep
      HandleSuspendKey=sleep
      LidSwitchIgnoreInhibited=no
    '';

    openssh = {
      enable = true;
      extraConfig = ''
        Match User media
          ForceCommand internal-sftp
          PermitTTY no
          AllowTcpForwarding no
          AllowStreamLocalForwarding no
          X11Forwarding no
          AllowAgentForwarding no
          ChrootDirectory /run/%u
          AuthorizedKeysFile /etc/ssh/authorized_keys.d/%u
      '';
    };

    atd = {
      enable = true;
      allowEveryone = true;
    };

    xserver = {
      enable = true;
      
      layout = "us";
      xkbVariant = "dvp";
      xkbOptions = "compose:caps";
      
      displayManager.slim = {
        enable = true;
        defaultUser = "gkleen";
      };

      desktopManager = {
        default = "none";
        xterm.enable = false;
      };

      windowManager = {
        default = "xmonad";
        xmonad = {
          enable = true;
          enableContribAndExtras = true;
          extraPackages = haskellPackages: (with haskellPackages; [ hostname libnotify taffybar ]);
        };
      };

      wacom.enable = true;
      multitouch.enable = true;

      dpi = 210;
    };

    ntp.enable = false;
    timesyncd.enable = true;

    customTinc.networks = ((import ./custom/tinc/yggdrasil.nix) {
      inherit (pkgs) stdenv nettools openresolv;
      connect = true;
      name = "hel";
      ipConf = {
        ip4 = [ { address = "10.141.2.3"; prefixLength = 16; } ];
      };
    });
    uucp = {
      enable = true;
      nodeName = "hel";
      remoteNodes = ["isaac" "ymir"]; # legacy name for odin
      sshUser = {
        openssh.authorizedKeys.keys = [ ''no-port-forwarding,no-X11-forwarding,no-agent-forwarding,command="${config.security.wrapperDir}/uucico" ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFH1QWdgoC03nzW5GBuCl2pqASHeIXIYtE9IInHdaKcO uucp@ymir''
	                                ''no-port-forwarding,no-X11-forwarding,no-agent-forwarding,command="${pkgs.writeScript "odin.sh" "#!${pkgs.stdenv.shell}\necho .\nexec -a uucico ${config.security.wrapperDir}/uucico\n"}" ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJhACtnt9+3j2ev4QVA2QBlPtblPnu7yol2njgfMlHtC uucp@odin''
                                      ];
      };
      sshConfig = ''
        Host isaac
          Hostname odin.asgard.yggdrasil
          IdentityFile ~/.ssh/odin
	Host ymir
	  Hostname ymir.niflheim.yggdrasil
	  IdentityFile ~/.ssh/ymir
      '';
      commandPath = [ "${pkgs.callPackage ./hel/recv-media.nix {}}/bin" config.security.wrapperDir ];
      defaultCommands = [];
      commands = {
        "isaac" = ["recv-media" "notify-gkleen"];
      };
      protocols = {
        "isaac" = "t";
      };
    };
    
    postfix = {
      enable = true;
      enableSmtp = true;
      enableSubmission = false;
      setSendmail = true;
      networksStyle = "host";
      hostname = "hel.midgard.yggdrasil";
      destination = [];
      relayHost = "uucp:ymir";
      recipientDelimiter = "+";
      extraMasterConf = ''
        uucp        unix - n n - - pipe flags=Fqhu user=uucp argv=${config.security.wrapperDir}/uux -z -a $sender - $nexthop!rmail ($recipient)
        sshsendmail unix - n n - - pipe flags=Fq user=postfix_ssh argv=${pkgs.openssh}/bin/ssh -F /var/db/postfix_ssh/ssh.config $nexthop sendmail -f $sender -G $recipient
      '';
      transport = ''
        gkleen+sent@yggdrasil.li uucp:isaac
      '';
      extraConfig = ''
        always_bcc = gkleen+sent@yggdrasil.li
      
        default_transport = uucp:ymir

        inet_interfaces = loopback-only
      
        authorized_submit_users = !uucp, static:anyone
        message_size_limit = 0

        sender_dependent_default_transport_maps = regexp:${pkgs.writeText "sender_relay" ''
          /@math(ematik)?\.(lmu|uni-muenchen)\.de$/ sshsendmail:math60.mathinst.loc
          /@(cip|stud)\.ifi\.(lmu|uni-muenchen)\.de$/ smtp:smtp.ifi.lmu.de
          /@campus\.lmu\.de$/ smtp:postout.lrz.de
        ''}

        smtp_sasl_auth_enable = yes
        smtp_sender_dependent_authentication = yes
        smtp_sasl_tls_security_options = noanonymous
        smtp_tls_security_level = dane
        smtp_sasl_password_maps = texthash:/var/db/postfix/sasl_passwd
        smtp_cname_overrides_servername = no
        smtp_always_send_ehlo = yes

        smtp_tls_loglevel = 1
        smtp_dns_support_level = dnssec
      '';
    };

    udev.extraRules = ''
      ACTION!="add|change", GOTO="mbim_to_qmi_rules_end"
      SUBSYSTEM!="usb|drivers", GOTO="mbim_to_qmi_rules_end"

      # load qmi_wwan module
      SUBSYSTEM=="usb", \
      ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \
        RUN+="/sbin/modprobe -b qmi_wwan"

      # force Sierra Wireless EM7455 to configuration #1
      SUBSYSTEM=="usb", \
      ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \
        ATTR{bConfigurationValue}="1"

      # add the new id in the qmi_wwan driver
      SUBSYSTEM=="drivers", \
      ENV{DEVPATH}=="/bus/usb/drivers/qmi_wwan", \
        ATTR{new_id}="1199 9079"

      # load qcserial module
      SUBSYSTEM=="usb", \
      ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \
        RUN+="/sbin/modprobe -b qcserial"

      # add the new id in the qcserial driver
      SUBSYSTEM=="drivers", \
      ENV{DEVPATH}=="/bus/usb-serial/drivers/qcserial", \
        ATTR{new_id}="1199 9079"

      LABEL="mbim_to_qmi_rules_end"
    '';

    printing = {
      enable = true;
      drivers = with pkgs; [ samsung-unified-linux-driver ];
    };

    upower = {
      enable = true;
    };

    locate = {
      enable = true;
      interval = "hourly";
      locate = pkgs.mlocate;
      localuser = null;
      prunePaths = ["/tmp" "/var/tmp" "/var/cache" "/var/lock" "/var/run" "/var/spool"];
    };

    dbus = {
      enable = true;
      packages = [ (pkgs.writeTextFile {
                      name = "eavesdrop.conf";
                      text = ''
                        <!DOCTYPE busconfig PUBLIC
                        "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
                        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
                        <busconfig>
                          <policy user="root">
                            <allow eavesdrop="true"/>
                            <allow eavesdrop="true" send_destination="*"/>
                          </policy>
                        </busconfig>
                      '';
                      destination = "/etc/dbus-1/system.d/eavesdrop.conf";
                    })
                 ];
    };
  };

  users = {
    mutableUsers = false;
  
    extraUsers.root = { inherit (import ./users/gkleen.nix) shell hashedPassword; };

    extraUsers.media = {
      group = "media";
      home = "/var/media";
      isSystemUser = true;
      openssh.authorizedKeys.keyFiles = [
        ./users/keys/gkleen-media-hel.pub
      ];
      useDefaultShell = true;
    };

    extraUsers.postfix_ssh = {
      isSystemUser = true;
      home = "/var/db/postfix_ssh";
    };

    extraGroups = {
      network = {};
      media = {
        members = [ "gkleen" "uucp" "media" ];
      };
      networkmanager = {
        members = [ "gkleen" ];
      };
    };
  };

  security = {
    sudo.extraConfig = ''
      Cmnd_Alias  SYSCTRL = /run/current-system/sw/sbin/shutdown, /run/current-system/sw/sbin/reboot, /run/current-system/sw/sbin/halt, /run/current-system/sw/bin/systemctl, ${pkgs.rewacom}/bin/rewacom
      %wheel ALL=(ALL) NOPASSWD: SYSCTRL
    '';

    wrappers = { "slock".source = "${pkgs.slock}/bin/slock";
                 "mount".source = "${pkgs.utillinux.bin}/bin/mount";
                 "umount".source = "${pkgs.utillinux.bin}/bin/umount";
                 "newgrp".source = "${pkgs.shadow}/bin/newgrp";
                 "thinklight".source =
                   "${(pkgs.callPackage ./custom/thinklight.nix { thinklight = "kbd_backlight"; })}/bin/thinklight";
                 "notify-gkleen" = {
                   group = "users";
                   owner = "gkleen";
                   setgid = true;
                   setuid = true;
                   permissions = "u+rx,g+x,o+x";
                   source = ''${pkgs.callPackage ./custom/notify-user.nix { inherit (pkgs.haskellPackages) ghcWithPackages; inherit (config.security) wrapperDir}}/bin/notify-gkleen'';
                 };
               };

    polkit = {
      enable = true;
      extraConfig = ''
        polkit.addRule(function(action, subject) {
          if (    action.id == "org.freedesktop.systemd1.manage-units"
               && subject.isInGroup("wheel")
             ) {
              return polkit.Result.YES;
          }
        });
      '';
    };
  };

  time.timeZone = "Europe/Berlin";

  hardware = {
    pulseaudio = {
      enable = true;
      package = with pkgs; pulseaudioFull;
      support32Bit = true;
    };

    opengl = {
      enable = true;
      extraPackages = with pkgs; [ vaapiIntel libvdpau-va-gl vaapiVdpau ];
      driSupport32Bit = true;
    };

    bluetooth.enable = true;   

    # sane = {
    #   enable = true;
    #   extraBackends = with pkgs; [ samsung-unified-linux-driver ];
    #   configDir = "/etc/sane.d";
    # };
  };

  sound.enable = true;


  # nix.gc = {
  #   automatic = true;
  #   dates = "daily";
  #   options = "--delete-older-than 30d";
  # };

  nix.useSandbox = true;

  environment.variables = {
    SSL_CERT_FILE = "/etc/ssl/certs/ca-certificates.crt";
  };

  environment.etc."X11/xorg.conf.d/50-wacom.conf".source = lib.mkForce ./hel/wacom.conf;

  environment.etc."sane.d/dll.conf".text = "xerox_mfp";
  environment.etc."sane.d/xerox_mfp.conf".text = "tcp printer.asgard.yggdrasil";

  systemd.services."kill-user@" = {
    serviceConfig = {
      Type = "oneshot";
      ExecStart = "${pkgs.systemd}/bin/loginctl kill-user %I";
    };
  };
  systemd.targets."sleep" = {
    after = [ "kill-user@uucp.service" ];
    wants = [ "kill-user@uucp.service" ];
  };

  virtualisation.virtualbox.host = {
    enable = true;
  };

  systemd.automounts = [
    { enable = true;
      where = "/run/media/var/media";
      automountConfig = {
        DirectoryMode = "700";
      };
      wantedBy = [ "local-fs.target" ];
    }
  ];

  systemd.mounts = [
    { enable = true;
      where = "/run/media/var/media";
      what = "/var/media";
      type = "none";
      options = "bind";
      mountConfig = {
        DirectoryMode = "700";
      };
    }
  ];

  systemd.user.services."pulseaudio".enable = lib.mkForce false;
  systemd.user.services."ssh-agent".enable = lib.mkForce false;
  systemd.user.sockets."pulseaudio".enable = lib.mkForce false;
}