nix-dotfiles/machines/celebrian/configuration.nix

# 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, lib, ... }:
{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
      ../profiles/base.nix
      ../services/ssh.nix
    ];

  # Use the GRUB 2 boot loader.
  boot.loader.grub.enable = true;
  #boot.loader.grub.version = 2; #Depreciated
  boot.loader.grub.efiSupport = true;
  boot.loader.grub.device = "/dev/vda"; # or "nodev" for efi only # Define on which hard drive you want to install Grub.

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


  # The global useDHCP flag is deprecated, therefore explicitly set to false here.
  # Per-interface useDHCP will be mandatory in the future, so this generated config
  # replicates the default behaviour.
  networking.useDHCP = false;                   
  networking.interfaces.ens18.useDHCP = true;
  networking.hostName = "addictedmaker"; # Define your hostname.
  networking.domain = "addictedmaker.eu"; # Define your domain.
  
  boot.kernel.sysctl = {
	"net.ipv4.conf.all.forwarding" = true;
	"net.ipv6.conf.all.forwarding" = true;
  };
  
  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";
  console = {
    font = "Lat2-Terminus16";
    keyMap = "no";

  };


  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
    git
    wget
    tailscale
    config.services.headscale.package
    kanidm
  ];

  users.users.gunalx = { # Define a user account. Don't forget to set a password with ‘passwd’.
    isNormalUser = true;
    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
    initialPassword = "pw123";  # this is changed imedeately.
  };


  #add proxyserver to acme
  users.users.kanidm.extraGroups = [ "acme" ];

#sequrity managment through kanidm
  systemd.services.kanidm = let
    certName = config.services.nginx.virtualHosts.${config.services.kanidm.serverSettings.domain}.useACMEHost;
  in {
    requires = [ "acme-finished-${certName}.target" ];
    serviceConfig.LoadCredential = let
      certDir = config.security.acme.certs.${certName}.directory;
    in [
      "fullchain.pem:${certDir}/fullchain.pem"
      "key.pem:${certDir}/key.pem"
    ];
  };

  services.kanidm = {
    enableServer = true;
    #enablePam = true;
    serverSettings = let
      credsDir = "/run/credentials/kanidm.service";
      #credsDir = "/var/lib/acme/${config.networking.domain}"; #the files are here but not readable
    in {
      origin = "https://${config.services.kanidm.serverSettings.domain}";
      domain = "auth.${config.networking.domain}";
      tls_chain = "${credsDir}/fullchain.pem";
      tls_key = "${credsDir}/key.pem";
      bindaddress = "localhost:8300";
    };

    clientSettings = {
      # This should be at /etc/kanidm/config or ~/.config/kanidm, and configures the kanidm command line tool
      uri = "${config.services.kanidm.serverSettings.bindaddress}";
      verify_ca = true;
      verify_hostnames = true;
    };
  };

  #environment = {
  #  etc."kanidm/config".text = ''
  #    uri="https://auth.${config.networking.domain}"
  #  '';
  #}; 


#vpn stuff
  #need to run at fresh install to create namespace: headscale namespaces create <namespace_name> 
  services.headscale = {
    enable = true;
    user = "headscale";
    address = "127.0.0.1";
    port = 8080;
    settings = {
      logtail.enabled = false;
      metrics_listen_addr = "127.0.0.1:9090";
      server_url = "https://${"vpn."+config.networking.domain}";
      dns_config = {
        base_domain = "${config.networking.domain}";
        magic_dns = true;
        nameservers = [
          "1.1.1.1"
        ];
      };

      ##should really implement with fex github and kanidm
      #oidc = {
      #  issuer  = "{config.services.kanidm.serverSettings.origin}";
      #  allowed_domains = Domains;
      #};
    };
  };

  #tailscale
  services.tailscale.enable = true;

  # Enable the OpenSSH daemon.
  services.openssh.enable = true;
  services.openssh.settings.UseDns = true;
  services.openssh.settings.PermitRootLogin = "prohibit-password";
  services.openssh.startWhenNeeded = true;
  services.openssh.ports = [ 6969 ];
  services.endlessh.enable = true; #ssh honeypot
  services.endlessh.port = 22;
  services.endlessh.openFirewall = true;
  services.sshguard.enable = true; #protection against brute force attacks like fail2ban

  users.users."root".openssh.authorizedKeys.keys = [
    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHTExYoT3+flrd2wPYiT7sFFDmAUqi2YAz0ldQg7WMop"
  ];
users.users."gunalx".openssh.authorizedKeys.keys = [
    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHTExYoT3+flrd2wPYiT7sFFDmAUqi2YAz0ldQg7WMop"
    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEj+Y0RUrSaF8gUW8m2BY6i8e7/0bUWhu8u8KW+AoHDh gunalx@nixos"
  ];

  #fail2ban
  services.fail2ban = {
    enable = true;
    maxretry = 5;
    ignoreIP = [
      "127.0.0.0/8" 
      "10.0.0.0/8" 
      "100.64.0.0/8" 
      "172.16.0.0/12"
      "192.168.0.0/16"
      "8.8.8.8"
    ];
  };

  #firewall options
  networking.firewall = {
    enable = true;
    checkReversePath = "loose";
    trustedInterfaces = [ "tailscale0" ];
    allowedUDPPorts = [
      8096
      80
      443
      #config.services.openssh.ports
      config.services.tailscale.port
      config.services.headscale.port
    ];
    allowedTCPPorts = config.networking.firewall.allowedUDPPorts;
  };

  # not needed in this config but should sty in default configuration.nix

  # 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 = "20.09"; # Did you read the comment?
  
}