Separate cert loading code from CertLibrary and move to src/chromeos

chromeos/network/cert_loader.h

+// 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_NETWORK_CERT_LOADER_H_
+#define CHROMEOS_NETWORK_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 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);
+  };
+
+  // Manage the global instance.
+  static void Initialize();
+  static void Shutdown();
+  static CertLoader* Get();
+
+  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;
+
+  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 RequestCertificates();
+
+  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 InitializeTPMToken();
+  void StartLoadCertificates();
+  void UpdateCertificates(net::CertificateList* cert_list);
+  void MaybeRetryRequestCertificates();
+  void RequestCertificatesTask();
+
+  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_;
+
+  // Active request task for re-requests while waiting for TPM init.
+  base::Closure request_task_;
+
+  // Local state.
+  bool tpm_token_ready_;
+  bool certificates_requested_;
+  bool certificates_loaded_;
+  // The key store for the current user has been loaded. This flag is needed to
+  // ensure that the key store will not be loaded twice in the policy recovery
+  // "safe-mode".
+  bool key_store_loaded_;
+
+  // 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_;
+
+  // TODO(stevenjb): Use multiple factories to track callback chains.
+  base::WeakPtrFactory<CertLoader> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(CertLoader);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_NETWORK_CERT_LOADER_H_