# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page, on
# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).

{ pkgs, ... }:

{
  imports = [
    # Include the results of the hardware scan.
    ./hardware-configuration.nix
    # This will install and configure Forgejo
    ./forgejo.nix
  ];

  # Use the systemd-boot EFI boot loader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  # networking.hostName = "nixos"; # Define your hostname.
  # Pick only one of the below networking options.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
  # networking.networkmanager.enable = true;  # Easiest to use and most distros use this by default.

  # Networking
  networking = {
    hostName = "vm02116";
    domain = "procolix.com";
    interfaces = {
      eth0 = {
        ipv4 = {
          addresses = [
            {
              address = "185.206.232.34";
              prefixLength = 24;
            }
          ];
        };
        ipv6 = {
          addresses = [
            {
              address = "2a00:51c0:12:1201::20";
              prefixLength = 64;
            }
          ];
        };
      };
    };
    defaultGateway = {
      address = "185.206.232.1";
      interface = "eth0";
    };
    defaultGateway6 = {
      address = "2a00:51c0:12:1201::1";
      interface = "eth0";
    };
    nameservers = [
      "2a00:51c0::5fd7:b906"
      "95.215.185.7"
    ];
    firewall.enable = false;
    nftables = {
      enable = true;
      ruleset = ''
        #!/usr/sbin/nft -f

        flush ruleset

        ########### define usefull variables here #####################
        define wan        = eth0
        define ssh_allow  = {
                    83.161.147.127/32, # host801 ipv4
                    95.215.185.92/32,  # host088 ipv4
                    95.215.185.211/32, # host089 ipv4
                    95.215.185.34/32,  # nagios2 ipv4
                    95.215.185.235,        # ansible-hq
                }
        define snmp_allow = {
                    95.215.185.31/32,   # cacti ipv4
                }
        define nrpe_allow = {
                    95.215.185.34/32,   # nagios2 ipv4
                }

        ########### here starts the automated bit #####################
        table inet filter {
            chain input {
                type filter hook input priority 0; 
                policy drop;

                # established/related connections
                ct state established,related accept
                ct state invalid drop

                # Limit ping requests.
                ip protocol icmp icmp type echo-request limit rate over 10/second burst 50 packets drop
                ip6 nexthdr icmpv6 icmpv6 type echo-request limit rate over 10/second burst 50 packets drop

                # loopback interface
                iifname lo accept
                
                # icmp
                ip protocol icmp icmp type { destination-unreachable, echo-reply, echo-request, source-quench, time-exceeded } accept
                # Without the nd-* ones ipv6 will not work.
                ip6 nexthdr icmpv6 icmpv6 type { destination-unreachable, echo-reply, echo-request, nd-neighbor-solicit,  nd-router-advert, nd-neighbor-advert, packet-too-big, parameter-problem, time-exceeded } accept

                # open tcp ports: sshd (22)
                #ip saddr $ssh_allow tcp dport {ssh} accept
                tcp dport {ssh} accept

                # open tcp ports: snmp (161)
                ip saddr $snmp_allow udp dport {snmp} accept

                # open tcp ports: nrpe (5666)
                ip saddr $nrpe_allow tcp dport {nrpe} accept

                # open tcp ports: http (80,443)
                tcp dport {http,https} accept
            }
            chain forward {
                type filter hook forward priority 0;
            }
            chain output {
                type filter hook output priority 0;
            }
        }

        table ip nat {
            chain postrouting {
            }   
            chain prerouting {
            }
        }  
      '';
    };
  };

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

  # 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";
  #   useXkbConfig = true; # use xkb.options in tty.
  # };

  # Enable the X11 windowing system.
  # services.xserver.enable = true;

  # Configure keymap in X11
  # services.xserver.xkb.layout = "us";
  # services.xserver.xkb.options = "eurosign:e,caps:escape";

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

  # Enable sound.
  # sound.enable = true;
  # hardware.pulseaudio.enable = true;

  # Enable touchpad support (enabled default in most desktopManager).
  # services.xserver.libinput.enable = true;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users = {
    procolix = {
      isNormalUser = true;
      extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
      openssh.authorizedKeys.keys = [
        "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAotfCIjLoDlHOe+++kVS1xiBPaS8mC5FypgrxDrDVst6SHxMTca2+IScMajzUZajenvNAoZOwIsyAPacT8OHeyFvV5Y7G874Qa+cZVqJxLht9gdXxr1GNabU3RfhhCh272dUeIKIqfgsRsM2HzdnZCMDavS1Yo+f+RhhHhnJIua+NdVFo21vPrpsz+Cd0M1NhojARLajrTHvEXW0KskUnkbfgxT0vL9jeRZxdgMS+a9ZoR5dbzOxQHWfbP8N04Xc+7CweMlvKwlWuAE/xDb5XLNHorfGWFvZuVhptJN8jPaaVS25wsmsF5IbaAuSZfzCtBdFQhIloUhy0L6ZisubHjQ== procolix@sshnode1"
        "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAuT3C0f3nyQ7SwUvXcFmEYEgwL+crY6iK0Bhoi9yfn4soz3fhfMKyKSwc/0RIlRnrz3xnkyJiV0vFeU7AC1ixbGCS3T9uc0G1x0Yedd9n2yR8ZJmkdyfjZ5KE4YvqZ3f6UZn5Mtj+7tGmyp+ee+clLSHzsqeyDiX0FIgFmqiiAVJD6qeKPFAHeWz9b2MOXIBIw+fSLOpx0rosCgesOmPc8lgFvo+dMKpSlPkCuGLBPj2ObT4sLjc98NC5z8sNJMu3o5bMbiCDR9JWgx9nKj+NlALwk3Y/nzHSL/DNcnP5vz2zbX2CBKjx6ju0IXh6YKlJJVyMsH9QjwYkgDQVmy8amQ== procolix@sshnode2"
      ];
    };
  };

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
    (pkgs.vim_configurable.customize {
      name = "vim";
      vimrcConfig.packages.myplugins = with pkgs.vimPlugins; {
        start = [ vim-nix ]; # load plugin on startup
      };
      vimrcConfig.customRC = ''
        " your custom vimrc
        set nocompatible
        set backspace=indent,eol,start
        " Turn on syntax highlighting by default
        syntax on
        " ...
      '';
    })
    wget
    subversion
  ];

  # 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;
  # };

  # List services that you want to enable:
  services = {
    openssh = {
      enable = true;
    };
    xe-guest-utilities = {
      enable = true;
    };
  };

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

  # Copy the NixOS configuration file and link it from the resulting system
  # (/run/current-system/configuration.nix). This is useful in case you
  # accidentally delete configuration.nix.
  system.copySystemConfiguration = true;

  # This option defines the first version of NixOS you have installed on this particular machine,
  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
  #
  # Most users should NEVER change this value after the initial install, for any reason,
  # even if you've upgraded your system to a new NixOS release.
  #
  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
  # so changing it will NOT upgrade your system.
  #
  # This value being lower than the current NixOS release does NOT mean your system is
  # out of date, out of support, or vulnerable.
  #
  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
  # and migrated your data accordingly.
  #
  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
  system.stateVersion = "24.05";

}