// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Mobius Forensic Toolkit
// Copyright (C) 2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021 Eduardo Aguiar
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option) any later
// version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#include "registry_key.h"
#include "registry_key_impl_lsa.h"
#include "registry_data_impl_lsa_poleklist.h"
#include <mobius/crypt/cipher_rc4.h>
#include <mobius/crypt/hash_md5.h>

namespace mobius
{
namespace os
{
namespace win
{
namespace registry
{
namespace               // local namespace
{
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief get decrypted LSAKEY
//! \param syskey registry SysKey
//! \param data PolSecKey value's data
//! \return decrypted LSAKEY
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static mobius::bytearray
get_lsa_key_from_polseckey (
  const mobius::bytearray& syskey,
  const mobius::bytearray& data)
{
  mobius::crypt::hash_md5 md5;
  md5.update (syskey);

  auto salt = data.slice (60, 75);
  for (int i = 0; i < 1000; i++)
    md5.update (salt);

  mobius::crypt::cipher_rc4 rc4 (md5.get_digest ());
  auto rc4_key = data.slice (12, 59);

  return rc4.decrypt (rc4_key).slice (16, 31);
}

} // local namespace

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief set LSA Secrets keys
//! \see https://www.passcape.com/index.php?section=docsys&cmd=details&id=23
//! \see http://moyix.blogspot.com.br/2008/02/decrypting-lsa-secrets.html
//! \see https://github.com/Neohapsis/creddump7/blob/master/framework/win32/lsasecrets.py
//! \see https://github.com/gentilkiwi/mimikatz/wiki
//! \param root registry root key
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
void
registry_set_lsa_keys (registry_key root, const mobius::bytearray& syskey)
{
  if (!syskey)
    return;

  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  // get PolRevision
  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  auto polrevision_data = root.get_data_by_path ("\\HKEY_LOCAL_MACHINE\\SECURITY\\Policy\\PolRevision\\(default)");

  if (!polrevision_data)
    return;

  std::uint32_t revision = polrevision_data.get_data_as_dword ();

  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  // decrypt LSA key
  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  mobius::bytearray lsa_key;
  registry_key_impl_lsa::type type;

  // Vista and newer ones
  if (revision > 0x10009)
    {
      auto poleklist_data = root.get_data_by_path ("\\HKEY_LOCAL_MACHINE\\SECURITY\\Policy\\PolEKList\\(default)");
      lsa_key = decrypt_aes (syskey, poleklist_data.get_data ());
      type = registry_key_impl_lsa::type::poleklist;
    }

  // Win2k - WinXp
  else
    {
      auto polseckey_data = root.get_data_by_path ("\\HKEY_LOCAL_MACHINE\\SECURITY\\Policy\\PolSecretEncryptionKey\\(default)");
      lsa_key = get_lsa_key_from_polseckey (syskey, polseckey_data.get_data ());
      type = registry_key_impl_lsa::type::polseckey;
    }

  if (!lsa_key)
    return;

  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  // set LSA Secrets keys
  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  for (auto key : root.get_key_by_mask ("\\HKEY_LOCAL_MACHINE\\SECURITY\\Policy\\Secrets\\*"))
    {
      auto currval_key = key.get_key_by_name ("Currval");

      if (currval_key)
        key.add_key (registry_key (std::make_shared <registry_key_impl_lsa> (currval_key, lsa_key, type)));

      auto oldval_key = key.get_key_by_name ("Oldval");

      if (oldval_key)
        key.add_key (registry_key (std::make_shared <registry_key_impl_lsa> (oldval_key, lsa_key, type)));
    }
}

} // namespace registry
} // namespace win
} // namespace os
} // namespace mobius
