{
  config,
  lib,
  options,
  pkgs,
  xinlib,
  isUnstable,
  ...
}: let
  inherit (xinlib) todo;
  caPubKeys = builtins.concatStringsSep "\n" [
    "ssh-rsa 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 SUAH CA"
  ];
  breakGlassKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIA6CO4aa8ymIgPgHRMwVLPnkUXwFQRKJa66R3wGXrAS0 BreakGlass";
  managementKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDM2k2C6Ufx5RNf4qWA9BdQHJfAkskOaqEWf8yjpySwH Nix Manager";
  statusKey = ''
    command="/run/current-system/sw/bin/xin-status",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE9PIhQ+yWfBM2tEG+W8W8HXJXqISXif8BcPZHakKvLM xin-status
  '';
  gosignify = pkgs.callPackage ./pkgs/gosignify.nix {inherit isUnstable;};
  myOpenSSH = pkgs.callPackage ./pkgs/openssh {};
in {
  imports = [
    ./configs
    ./dbuild
    ./gui
    ./modules
    ./overlays
    ./pkgs
    ./services
    ./system/nix-config.nix
    ./system/nix-lockdown.nix
    ./system/update.nix
    ./users

    ./monitoring

    ./bins
  ];

  options.myconf = {
    managementPubKeys = lib.mkOption rec {
      type = lib.types.listOf lib.types.str;
      default = [managementKey statusKey breakGlassKey];
      example = default;
      description = "List of management public keys to use";
    };
    hwPubKeys = lib.mkOption rec {
      type = lib.types.listOf lib.types.str;
      default = [
        "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIB1cBO17AFcS2NtIT+rIxR2Fhdu3HD4de4+IsFyKKuGQAAAACnNzaDpsZXNzZXI="
        "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIDEKElNAm/BhLnk4Tlo00eHN5bO131daqt2DIeikw0b2AAAABHNzaDo="
        "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBBB/V8N5fqlSGgRCtLJMLDJ8Hd3JcJcY8skI0l+byLNRgQLZfTQRxlZ1yymRs36rXj+ASTnyw5ZDv+q2aXP7Lj0="
        "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIHrYWbbgBkGcOntDqdMaWVZ9xn+dHM+Ap6s1HSAalL28AAAACHNzaDptYWlu"
        "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBOyQpDBHjHb3tWnPO6QAjh6KzWYqpabzfjpuwfEUzmUiHpPiU+f4ejNgRFDf9p84SQDz3EXxUMsW/kJ1crAkwOg= surf"
      ];
      example = default;
      description = "List of hardware public keys to use";
    };
  };

  config = {
    sops.age.sshKeyPaths = ["/etc/ssh/ssh_host_ed25519_key"];

    sops.secrets = {
      xin_secrets_deploy_key = {
        sopsFile = config.xin-secrets.deploy;
        owner = "root";
        group = "wheel";
        mode = "400";
      };
    };

    security.pki.caCertificateBlacklist = ["TrustCor ECA-1" "TrustCor RootCert CA-1" "TrustCor RootCert CA-2"];
    security.pki.certificates = [
      ''
        -----BEGIN CERTIFICATE-----
        MIIBrjCCAVOgAwIBAgIIKUKZ6zcNut8wCgYIKoZIzj0EAwIwFzEVMBMGA1UEAxMM
        Qm9sZDo6RGFlbW9uMCAXDTIyMDEyOTAxMDMxOVoYDzIxMjIwMTI5MDEwMzE5WjAX
        MRUwEwYDVQQDEwxCb2xkOjpEYWVtb24wWTATBgcqhkjOPQIBBggqhkjOPQMBBwNC
        AARYgIn1RWf059Hb964JEaiU3G248k2ZpBHtrACMmLRRO9reKr/prEJ2ltKrjCaX
        +98ButRNIn78U8pL+H+aeE0Zo4GGMIGDMA4GA1UdDwEB/wQEAwIChDAdBgNVHSUE
        FjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwEgYDVR0TAQH/BAgwBgEB/wIBADAdBgNV
        HQ4EFgQUiUdCcaNy3E2bFzO9I76TPlMJ4w4wHwYDVR0jBBgwFoAUiUdCcaNy3E2b
        FzO9I76TPlMJ4w4wCgYIKoZIzj0EAwIDSQAwRgIhAOd6ejqevrYAH5JtDdy2Mh9M
        OTIx9nDZd+AOAg0wzlzfAiEAvG5taCm14H+qdWbEZVn+vqj6ChtxjH7fqOHv3Xla
        HWw=
        -----END CERTIFICATE-----
      ''
    ];

    i18n.defaultLocale = "en_US.utf8";

    users.motd = ''

                                            .-
                                     :      :=  .
                             ::      .=     --  +     -:    --
                              +.  =.  =-    -- :=    =:   .=:
                              :=  -=-: =.   -: =:  .=:   -=.   :-.
                     .:        -:  +.=--:   -.:-. :-:  :-:   :=:
                      :=: :.   .-: -- ==-.:-- ==-:::  ::.  :=-    .
                        =-.--   -+:----+=.-=::-==.---.:: :-:   .--.
           ..       :    :-:-=::-:*=-:=-=-.:--:-.:=--=++*+- .:-:.
            .--.    .=:  :.=:-+=-:-+=:-=-=-.:--=--==++=====++:...:::.
            .-===:.   --.-*++::----=+-:-=-:-----=+**++**++===+:::...
          .==-::=-:::. ==-=++-:-=-:::=--=-:===+##%*-...-***+==+:::..
        .==-:----++-:-::-=::=+--+=-:-==-:::::#@%@+       ***+-+#: ...
        ======----=**+::===:.-=-:==::::::::::*@%%        =%**+==+*-..
       :-:::--=---:=+===-:--..-=-.:::::::::::=@%%        =@#**+===
       :::--::----=-:::=+-::::=-::::::::::::::*@@+      :%%%%#***+..
       :::::------#=-:-=-===-::::::::::::::::::=*%*-..:+%%%%@%=.   :
       :-----------:::==----=----:::::::::::::::::------:---=+**+=+.
       .=+========+==--::::::::::::::::::::::::::-=-:::::::::::==#:
         :-:--====*=::----::::::::::::::::::::::-:.=-::::::::::::+.
          :+=----:.:::---:::::::::::::::::::::::-::-------------=+
      .::::......:-=+=--::::----::::::::::::::::--::::::::::::::-::.
              .::.  .+--===++=-::::::::::::::::::::::::::::::::. .-=.
                 .::-=+**++=-----:::::=-::::::::::::::::::::::::::.
            .::--::.  .---------=----=-:::::::::::::::::::::--.
            .          -:-------------:::::::::::::::::::::--
                       .=:::---------:::::::::::::::....:--.
                        :=-:::::---===::::...........::::
                          -========-:::::::::::::::::.
                            .....

    '';

    boot = {
      loader = {systemd-boot.configurationLimit = 15;};
      kernelPackages = lib.mkDefault pkgs.linuxPackages_hardened;
      kernel.sysctl = {
        "net.ipv4.tcp_keepalive_time" = 60;
        "net.ipv6.tcp_keepalive_time" = 60;
      };
      tmp.cleanOnBoot = true;
    };

    nix = {
      settings =
        if config.xinCI.enable
        then {}
        else {
          substituters = ["https://nix-binary-cache.humpback-trout.ts.net/"];
          trusted-public-keys = [
            "nix-binary-cache.humpback-trout.ts.net:e9fJhcRtNVp6miW2pffFyK/gZ2et4y6IDigBNrEsAa0="
          ];
        };
    };

    environment.systemPackages = with pkgs;
      [
        age
        apg
        bind
        btop
        direnv
        git-bug
        git-sync
        gosignify
        got
        jq
        lz4
        minisign
        mosh
        nb
        nix-diff
        nix-index
        nix-top
        pass
        ripgrep
        taskwarrior
        tmux
      ]
      ++ (
        if isUnstable
        then [nil]
        else []
      );

    environment.interactiveShellInit = ''
      alias vi=nvim
    '';

    time.timeZone = "US/Mountain";

    documentation.man.enable = true;

    networking.timeServers = options.networking.timeServers.default;

    programs = {
      zsh.enable = true;
      gnupg.agent.enable = true;
      ssh = {
        package = myOpenSSH.openssh;
        agentPKCS11Whitelist = "${pkgs.opensc}/lib/opensc-pkcs11.so";
        knownHosts = {
          "[namish.humpback-trout.ts.net]:2222".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIF9jlU5XATs8N90mXuCqrflwOJ+s3s7LefDmFZBx8cCk";
          "[git.tapenet.org]:2222".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOkbSJWeWJyJjak/boaMTqzPVq91wfJz1P+I4rnBUsPW";
        };
        knownHostsFiles = [./configs/ssh_known_hosts];
        startAgent = true;
        agentTimeout = "100m";
        extraConfig = ''
          Host *
            controlmaster         auto
            controlpath           /tmp/ssh-%r@%h:%p

          VerifyHostKeyDNS	yes
          AddKeysToAgent	confirm 90m
          CanonicalizeHostname	always
        '';
      };
    };

    environment.etc."ssh/ca.pub" = {text = caPubKeys;};

    services.logrotate.checkConfig =
      todo "logrotate disabled: https://github.com/NixOS/nix/issues/8502" false;

    services = {
      openssh = {
        enable = true;
        extraConfig = ''
          TrustedUserCAKeys = /etc/ssh/ca.pub
        '';
        settings = {
          PermitRootLogin = "prohibit-password";
          PasswordAuthentication = false;
          KexAlgorithms = ["curve25519-sha256" "curve25519-sha256@libssh.org"];
          Macs = [
            "hmac-sha2-512-etm@openssh.com"
            "hmac-sha2-256-etm@openssh.com"
            "umac-128-etm@openssh.com"
          ];
        };
      };
    };
  };
}