nixos-config/system/all/sshd-known-hosts-bootup.nix

{ lib, pkgs, ... }:
with lib;
let

  computers = {
    workhorse = {
      onionId = fileContents <common_secrets/onion/workhorse>;
      publicKey =
        "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBB+sHmukNa2TmtBDCqN+LVaYblvHztD/ziK2cbKR8dEHztF0YBS60MHMpbGPOII5NVMUY6Z2OHFBQi9X6PG1YBY=";
    };
    porani = {
      onionId = fileContents <common_secrets/onion/porani>;
      publicKey =
        "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBGFaTRGqMd/rKpyMUP6wVbgiWFOUvUV2qS/B5Xe02UUch/wxR4fTCY+vnzku5K0V/qqJpjYLgHotwZFqO/8lFu4=";
    };
  };

in {

  services.openssh.knownHosts = mapAttrs' (name:
    { onionId, publicKey, ... }: {
      name = "${name}-init-ssh";
      value = {
        hostNames = [ onionId ];
        inherit publicKey;
      };
    }) computers;

  environment.systemPackages = let

    ssh = mapAttrsToList (name:
      { onionId, ... }:
      pkgs.writers.writeDashBin "ssh-boot-to-${name}" ''
        ${pkgs.tor}/bin/torify ${pkgs.openssh}/bin/ssh root@${onionId} -p 23
      '') computers;

    password = mapAttrsToList (name:
      { onionId, ... }:
      pkgs.writers.writeDashBin "unlock-boot-${name}" ''
        ${pkgs.tor}/bin/torify ${pkgs.openssh}/bin/ssh root@${onionId} -p 23 '
        echo -n "enter password : "
        read password
        echo "$password" > /crypt-ramfs/passphrase
        '
      '') computers;

  in ssh ++ password;

}