secure_module_util_chromeos.cc 1.5 KB

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  1. // Copyright 2017 The Chromium Authors. All rights reserved.
  2. // Use of this source code is governed by a BSD-style license that can be
  3. // found in the LICENSE file.
  4. #include "components/login/secure_module_util_chromeos.h"
  5. #include "base/bind.h"
  6. #include "base/files/file_path.h"
  7. #include "base/files/file_util.h"
  8. #include "base/task/thread_pool.h"
  9. namespace login {
  10. namespace {
  11. // If either of these two files exist, then we are using Cr50 and not using TPM.
  12. constexpr char kCr50UsedIndicatorFile1[] =
  13. "/opt/google/cr50/firmware/cr50.bin.prod";
  14. constexpr char kCr50UsedIndicatorFile2[] = "/etc/init/cr50-update.conf";
  15. SecureModuleUsed g_secure_module_used = SecureModuleUsed::UNQUERIED;
  16. SecureModuleUsed GetSecureModuleInfoFromFilesAndCacheIt() {
  17. if (base::PathExists(base::FilePath(kCr50UsedIndicatorFile1)) ||
  18. base::PathExists(base::FilePath(kCr50UsedIndicatorFile2))) {
  19. g_secure_module_used = SecureModuleUsed::CR50;
  20. } else {
  21. g_secure_module_used = SecureModuleUsed::TPM;
  22. }
  23. return g_secure_module_used;
  24. }
  25. } // namespace
  26. void GetSecureModuleUsed(GetSecureModuleUsedCallback callback) {
  27. if (g_secure_module_used != SecureModuleUsed::UNQUERIED) {
  28. std::move(callback).Run(g_secure_module_used);
  29. return;
  30. }
  31. base::ThreadPool::PostTaskAndReplyWithResult(
  32. FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
  33. base::BindOnce(&GetSecureModuleInfoFromFilesAndCacheIt),
  34. std::move(callback));
  35. }
  36. } // namespace login