servers/losurdo/security.nix

   1 { pkgs, lib, config, ... }:
   2 let
   3   inherit (config.security) pass;
   4   rootKey = "root/key";
   5   initrdKey = "initrd/ssh.key";
   6 in
   7 {
   8 imports = [
   9   <nixpkgs/nixos/modules/profiles/hardened.nix>
  10 ];
  11 security.pass = {
  12   store = ../../../sec/pass/servers/losurdo;
  13   secrets."${rootKey}" = {
  14     gpg = ../../../sec/gnupg/servers/losurdo/root/key.gpg;
  15     # Symmetrically decrypt and load the rootKey into root's gnupg secret keyring.
  16     postStart = ''
  17       set -x
  18       ${pkgs.gnupg}/bin/gpg --batch --pinentry-mode loopback \
  19        --passphrase-file /${rootKey}.pass \
  20        --import '${pass.secrets."${rootKey}".path}'
  21       shred -u '${pass.secrets."${rootKey}".path}'
  22     '';
  23   };
  24 };
  25 install.ssh-nixos = {
  26   PATH = with pkgs; [gnupg openssh];
  27   # Decrypt the rootKey passphrase and the initrd SSH host key
  28   # and send them to the target host.
  29   script = lib.mkBefore ''
  30     gpg --decrypt '${pass.store}/${rootKey}.pass.gpg' |
  31     ssh '${config.install.ssh-nixos.target}' install -D -m 400 -o root -g root /dev/stdin /${rootKey}.pass
  32     gpg --decrypt '${pass.store}/${initrdKey}.gpg' |
  33     ssh '${config.install.ssh-nixos.target}' install -D -m 400 -o root -g root /dev/stdin /run/${initrdKey}
  34   '';
  35 };
  36 boot.initrd.network.ssh.hostKeys = [ "/run/${initrdKey}" ];
  37 systemd.services = lib.mapAttrs' (target: secret:
  38   # Start the rootKey service before the other services decrypting secrets.
  39   lib.nameValuePair (lib.removeSuffix ".service" secret.service)
  40     (lib.optionalAttrs (target != "${rootKey}") {
  41       after = [ pass.secrets."${rootKey}".service ];
  42       wants = [ pass.secrets."${rootKey}".service ];
  43     })
  44   ) pass.secrets;
  45 }