machines/mermet/security.nix

   1 { pkgs, lib, config, machineName, ... }:
   2 let
   3   inherit (config.security) gnupg;
   4   rootKey = "root/key";
   5   initrdKey = "initrd/ssh.key";
   6   keygrip = "89F52A879E0019A966503AFFDE72EEA84CDFA3A7";
   7 in
   8 {
   9 imports = [
  10   <nixpkgs/nixos/modules/profiles/hardened.nix>
  11 ];
  12 security.gnupg.store = builtins.getEnv "PASSWORD_STORE_DIR" + "/machines/${machineName}";
  13 services.openssh.extraConfig = ''
  14   StreamLocalBindUnlink yes
  15 '';
  16 installer.ssh-nixos = {
  17   PATH = [pkgs.gnupg pkgs.openssh];
  18   script = lib.mkMerge [
  19     (lib.mkBefore ''
  20       # Send the SSH key of the initrd
  21       gpg --decrypt '${gnupg.store}/${initrdKey}.gpg' |
  22       ssh '${config.installer.ssh-nixos.target}' \
  23       install -D -m 400 -o root -g root /dev/stdin /root/${initrdKey}
  24     '')
  25     (lib.mkBefore ''
  26       # Send the rootKey
  27       gpg --decrypt '${gnupg.store}/${rootKey}.pass.gpg' |
  28       gpg --batch --pinentry-mode loopback --passphrase-fd 0 --export-secret-subkeys @root@${machineName} |
  29       ssh '${config.installer.ssh-nixos.target}' \
  30       install -D -d -m 640 /run/user/0/gnupg/d.6qoenf9br6fajbkknuz1i6ts '&&' \
  31       gpg --no-autostart --homedir /var/lib/gnupg --no-autostart --batch --pinentry-mode loopback --import || true
  32
  33       # Send the rootKey's passphrase
  34       gpg --decrypt '${gnupg.store}/${rootKey}.pass.gpg' |
  35       ssh '${config.installer.ssh-nixos.target}' \
  36       install -D -d -m 640 /run/user/0/gnupg/d.6qoenf9br6fajbkknuz1i6ts '&&' \
  37       gpg-preset-passphrase \
  38         --homedir /var/lib/gnupg \
  39         --preset ${keygrip} || true
  40     '')
  41   ];
  42 };
  43 boot.initrd.network.ssh.hostKeys = [ "/root/${initrdKey}" ];
  44 }