servers/mermet/security.nix

   1 { pkgs, lib, config, ... }:
   2 let
   3   inherit (config.security) pass;
   4   rootKey = "root/key";
   5 in
   6 {
   7 imports = [
   8   <nixpkgs/nixos/modules/profiles/hardened.nix>
   9 ];
  10 security.pass = {
  11   store = ../../../sec/pass/servers/mermet;
  12   secrets."${rootKey}" = {
  13     gpg = ../../../sec/gnupg/servers/mermet/root/key.gpg;
  14     # Symmetrically decrypt and load the rootKey into root's gnupg secret keyring.
  15     postStart = ''
  16       ${pkgs.gnupg}/bin/gpg --batch --pinentry-mode loopback \
  17        --passphrase-file /${rootKey}.pass \
  18        --import '${pass.secrets."${rootKey}".path}'
  19       shred -u '${pass.secrets."${rootKey}".path}'
  20     '';
  21   };
  22 };
  23 install.ssh-nixos = {
  24   PATH = with pkgs; [gnupg openssh];
  25   # Decrypt the rootKey passphrase and send it to the target host.
  26   script = lib.mkBefore ''
  27     gpg --decrypt '${pass.store}/${rootKey}.pass.gpg' |
  28     ssh '${config.install.ssh-nixos.target}' install -D -m 400 -o root -g root /dev/stdin /${rootKey}.pass
  29   '';
  30 };
  31 systemd.services = lib.mapAttrs' (target: secret:
  32   # Start the rootKey service before the other services decrypting secrets.
  33   lib.nameValuePair (lib.removeSuffix ".service" secret.service)
  34     (lib.optionalAttrs (target != "${rootKey}") {
  35       after = [ pass.secrets."${rootKey}".service ];
  36       wants = [ pass.secrets."${rootKey}".service ];
  37     })
  38   ) pass.secrets;
  39 }