Initial version of tpm_init, a library for taking ownership of the TPM.

tpm_init.cc

+// Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Contains the implementation of class TpmInit
+
+#include "tpm_init.h"
+
+#include <base/logging.h>
+#include <base/time.h>
+
+#include "tpm.h"
+
+namespace tpm_init {
+
+// TpmInitTask is a private class used to handle asynchronous initialization of
+// the TPM.
+class TpmInitTask : public PlatformThread::Delegate {
+ public:
+  TpmInitTask();
+  virtual ~TpmInitTask();
+
+  void Init();
+
+  virtual void ThreadMain();
+
+  bool IsTpmReady();
+  bool IsTpmEnabled();
+  bool GetTpmPassword(chromeos::Blob* password);
+  long GetInitializationMillis();
+
+ private:
+  scoped_ptr<tpm_init::Tpm> default_tpm_;
+  tpm_init::Tpm* tpm_;
+  bool initialize_status_;
+  bool task_done_;
+  long initialization_time_;
+};
+
+TpmInit::TpmInit()
+    : tpm_init_(new TpmInitTask()) {
+}
+
+TpmInit::~TpmInit() {
+}
+
+bool TpmInit::StartInitializeTpm() {
+  tpm_init_->Init();
+  if (!PlatformThread::CreateNonJoinable(0, tpm_init_.get())) {
+    LOG(ERROR) << "Unable to create TPM initialization background thread.";
+    return false;
+  }
+  return true;
+}
+
+bool TpmInit::IsTpmReady() {
+  return tpm_init_->IsTpmReady();
+}
+
+bool TpmInit::IsTpmEnabled() {
+  return tpm_init_->IsTpmEnabled();
+}
+
+bool TpmInit::GetTpmPassword(chromeos::Blob* password) {
+  return tpm_init_->GetTpmPassword(password);
+}
+
+long TpmInit::GetInitializationMillis() {
+  return tpm_init_->GetInitializationMillis();
+}
+
+TpmInitTask::TpmInitTask()
+    : default_tpm_(new tpm_init::Tpm()),
+      tpm_(default_tpm_.get()),
+      initialize_status_(false),
+      task_done_(false),
+      initialization_time_(-1) {
+}
+
+TpmInitTask::~TpmInitTask() {
+}
+
+void TpmInitTask::Init() {
+  tpm_->Init();
+}
+
+void TpmInitTask::ThreadMain() {
+  base::TimeTicks start = base::TimeTicks::Now();
+  initialize_status_ = tpm_->InitializeTpm();
+  base::TimeDelta delta = (base::TimeTicks::Now() - start);
+  initialization_time_ = delta.InMilliseconds();
+  if (initialize_status_) {
+    LOG(ERROR) << "TPM initialization took " << initialization_time_ << "ms";
+  }
+  task_done_ = true;
+}
+
+bool TpmInitTask::IsTpmReady() {
+  // The TPM is not "ready" if the init call has not completed.  It may be in
+  // the middle of taking ownership.
+  if (!task_done_) {
+    return false;
+  }
+  // If initialize_status_ is true, then the TPM went through a full succesful
+  // ownership cycle in InitializeTpm()
+  if (initialize_status_) {
+    return true;
+  }
+  // If we get here, then the call to InitializeTpm() is complete and it
+  // returned false.  That merely means that it did not successfully take
+  // ownership, which is the common case after ownership is established on OOBE.
+  // In that case, the TPM is ready if it is enabled and owned.
+  return (tpm_->IsEnabled() && tpm_->IsOwned());
+}
+
+bool TpmInitTask::IsTpmEnabled() {
+  return tpm_->IsEnabled();
+}
+
+bool TpmInitTask::GetTpmPassword(chromeos::Blob* password) {
+  return tpm_->GetOwnerPassword(password);
+}
+
+long TpmInitTask::GetInitializationMillis() {
+  return initialization_time_;
+}
+
+}  // namespace tpm_init