Call crypto::InitializeTPMToken on the IO thread (Take 2)

This is identical to https://chromiumcodereview.appspot.com/15649018
with the following addition:

Call DeviceSettingsService::EnsureReload once certs are loaded

BUG=244455
R=mnissler@chromium.org, nkostylev@chromium.org, rsleevi@chromium.org, xiyuan@chromium.org

Review URL: https://codereview.chromium.org/20130002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@213951 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 183 insertions, 0 deletions

diff --git a/chromeos/cert_loader.h b/chromeos/cert_loader.h
new file mode 100644
index 0000000..69e3191
--- /dev/null
+++ b/chromeos/cert_loader.h
@@ -0,0 +1,183 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMEOS_CERT_LOADER_H_
+#define CHROMEOS_CERT_LOADER_H_
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/observer_list_threadsafe.h"
+#include "base/threading/thread_checker.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/dbus/dbus_method_call_status.h"
+#include "chromeos/login/login_state.h"
+#include "net/cert/cert_database.h"
+#include "net/cert/x509_certificate.h"
+
+namespace base {
+class SequencedTaskRunner;
+}
+
+namespace crypto {
+class SymmetricKey;
+}
+
+namespace chromeos {
+
+// This class is responsible for initializing the TPM token and loading
+// certificates once the TPM is initialized. It is expected to be constructed
+// on the UI thread and public methods should all be called from the UI thread.
+// When certificates have been loaded (after login completes), or the cert
+// database changes, observers are called with OnCertificatesLoaded().
+class CHROMEOS_EXPORT CertLoader : public net::CertDatabase::Observer,
+                                   public LoginState::Observer {
+ public:
+  class Observer {
+   public:
+    virtual ~Observer() {}
+
+    // Called when the certificates, passed for convenience as |cert_list|,
+    // have completed loading. |initial_load| is true the first time this
+    // is called.
+    virtual void OnCertificatesLoaded(const net::CertificateList& cert_list,
+                                      bool initial_load) = 0;
+
+   protected:
+    Observer() {}
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Observer);
+  };
+
+  // Sets the global instance. Must be called before any calls to Get().
+  static void Initialize();
+
+  // Destroys the global instance.
+  static void Shutdown();
+
+  // Gets the global instance. Initialize() must be called first.
+  static CertLoader* Get();
+
+  // Returns true if the global instance has been initialized.
+  static bool IsInitialized();
+
+  // |crypto_task_runner| is the task runner that any synchronous crypto calls
+  // should be made from. e.g. in Chrome this is the IO thread. Must be called
+  // after the thread is started. Certificate loading will not happen unless
+  // this is set.
+  void SetCryptoTaskRunner(
+      const scoped_refptr<base::SequencedTaskRunner>& crypto_task_runner);
+
+  void AddObserver(CertLoader::Observer* observer);
+  void RemoveObserver(CertLoader::Observer* observer);
+
+  // Returns true when the certificate list has been requested but not loaded.
+  bool CertificatesLoading() const;
+
+  // Returns true if the TPM is available for hardware-backed certificates.
+  bool IsHardwareBacked() const;
+
+  std::string GetPkcs11IdForCert(const net::X509Certificate& cert) const;
+
+  bool certificates_loaded() const { return certificates_loaded_; }
+
+  // TPM info is only valid once the TPM is available (IsHardwareBacked is
+  // true). Otherwise empty strings will be returned.
+  const std::string& tpm_token_name() const { return tpm_token_name_; }
+  const std::string& tpm_token_slot() const { return tpm_token_slot_; }
+  const std::string& tpm_user_pin() const { return tpm_user_pin_; }
+
+  // This will be empty until certificates_loaded() is true.
+  const net::CertificateList& cert_list() const { return cert_list_; }
+
+ private:
+  CertLoader();
+  virtual ~CertLoader();
+
+  void Init();
+  void MaybeRequestCertificates();
+
+  // This is the cyclic chain of callbacks to initialize the TPM token and to
+  // kick off the update of the certificate list.
+  void InitializeTokenAndLoadCertificates();
+  void RetryTokenInitializationLater();
+  void OnPersistentNSSDBOpened();
+  void OnTpmIsEnabled(DBusMethodCallStatus call_status,
+                      bool tpm_is_enabled);
+  void OnPkcs11IsTpmTokenReady(DBusMethodCallStatus call_status,
+                               bool is_tpm_token_ready);
+  void OnPkcs11GetTpmTokenInfo(DBusMethodCallStatus call_status,
+                               const std::string& token_name,
+                               const std::string& user_pin);
+  void OnTPMTokenInitialized(bool success);
+
+  // These calls handle the updating of the certificate list after the TPM token
+  // was initialized.
+  void StartLoadCertificates();
+  void UpdateCertificates(net::CertificateList* cert_list);
+
+  void NotifyCertificatesLoaded(bool initial_load);
+
+  // net::CertDatabase::Observer
+  virtual void OnCertTrustChanged(const net::X509Certificate* cert) OVERRIDE;
+  virtual void OnCertAdded(const net::X509Certificate* cert) OVERRIDE;
+  virtual void OnCertRemoved(const net::X509Certificate* cert) OVERRIDE;
+
+  // LoginState::Observer
+  virtual void LoggedInStateChanged(LoginState::LoggedInState state) OVERRIDE;
+
+  ObserverList<Observer> observers_;
+
+  bool certificates_requested_;
+  bool certificates_loaded_;
+  bool certificates_update_required_;
+  bool certificates_update_running_;
+
+  // The states are traversed in this order but some might get omitted or never
+  // be left.
+  enum TPMTokenState {
+    TPM_STATE_UNKNOWN,
+    TPM_DB_OPENED,
+    TPM_DISABLED,
+    TPM_ENABLED,
+    TPM_TOKEN_READY,
+    TPM_TOKEN_INFO_RECEIVED,
+    TPM_TOKEN_INITIALIZED,
+  };
+  TPMTokenState tpm_token_state_;
+
+  // The current request delay before the next attempt to initialize the
+  // TPM. Will be adapted after each attempt.
+  base::TimeDelta tpm_request_delay_;
+
+  // Cached TPM token info.
+  std::string tpm_token_name_;
+  std::string tpm_token_slot_;
+  std::string tpm_user_pin_;
+
+  // Cached Certificates.
+  net::CertificateList cert_list_;
+
+  base::ThreadChecker thread_checker_;
+
+  // TaskRunner for crypto calls.
+  scoped_refptr<base::SequencedTaskRunner> crypto_task_runner_;
+
+  // This factory should be used only for callbacks during TPMToken
+  // initialization.
+  base::WeakPtrFactory<CertLoader> initialize_token_factory_;
+
+  // This factory should be used only for callbacks during updating the
+  // certificate list.
+  base::WeakPtrFactory<CertLoader> update_certificates_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(CertLoader);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_CERT_LOADER_H_