cryptohome_client.cc

// Copyright (c) 2012 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.

#include "chromeos/dbus/cryptohome_client.h"

#include <stddef.h>
#include <stdint.h>

#include "base/bind.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "chromeos/cryptohome/async_method_caller.h"
#include "chromeos/cryptohome/cryptohome_parameters.h"
#include "chromeos/dbus/blocking_method_caller.h"
#include "chromeos/dbus/cryptohome/key.pb.h"
#include "chromeos/dbus/cryptohome/rpc.pb.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_path.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"

namespace chromeos {

const int CryptohomeClient::kNotReadyAsyncId = -1;

namespace {

// This suffix is appended to cryptohome_id to get hash in stub implementation:
// stub_hash = "[cryptohome_id]-hash";
static const char kUserIdStubHashSuffix[] = "-hash";

// Timeout for TPM operations. On slow machines it should be larger, than
// default DBus timeout. TPM operations can take up to 80 seconds, so limit
// is 2 minutes.
const int kTpmDBusTimeoutMs = 2 * 60 * 1000;

void FillIdentificationProtobuf(const cryptohome::Identification& id,
                                cryptohome::AccountIdentifier* id_proto) {
  id_proto->set_account_id(id.id());
}

// The CryptohomeClient implementation.
class CryptohomeClientImpl : public CryptohomeClient {
 public:
  CryptohomeClientImpl() : proxy_(NULL), weak_ptr_factory_(this) {}

  // CryptohomeClient override.
  void SetAsyncCallStatusHandlers(
      const AsyncCallStatusHandler& handler,
      const AsyncCallStatusWithDataHandler& data_handler) override {
    async_call_status_handler_ = handler;
    async_call_status_data_handler_ = data_handler;
  }

  // CryptohomeClient override.
  void ResetAsyncCallStatusHandlers() override {
    async_call_status_handler_.Reset();
    async_call_status_data_handler_.Reset();
  }

  // CryptohomeClient override.
  void SetLowDiskSpaceHandler(const LowDiskSpaceHandler& handler) override {
    low_disk_space_handler_ = handler;
  }

  // CryptohomeClient override.
  void SetDircryptoMigrationProgressHandler(
      const DircryptoMigrationProgessHandler& handler) override {
    dircrypto_migration_progress_handler_ = handler;
  }

  // CryptohomeClient override.
  void WaitForServiceToBeAvailable(
      const WaitForServiceToBeAvailableCallback& callback) override {
    proxy_->WaitForServiceToBeAvailable(callback);
  }

  // CryptohomeClient override.
  void IsMounted(const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeIsMounted);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void Unmount(const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeUnmount);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void AsyncCheckKey(const cryptohome::Identification& cryptohome_id,
                     const std::string& key,
                     const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeAsyncCheckKey);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncMigrateKey(const cryptohome::Identification& cryptohome_id,
                       const std::string& from_key,
                       const std::string& to_key,
                       const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeAsyncMigrateKey);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(from_key);
    writer.AppendString(to_key);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncRemove(const cryptohome::Identification& cryptohome_id,
                   const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeAsyncRemove);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void RenameCryptohome(const cryptohome::Identification& cryptohome_id_from,
                        const cryptohome::Identification& cryptohome_id_to,
                        const ProtobufMethodCallback& callback) override {
    const char* method_name = cryptohome::kCryptohomeRenameCryptohome;
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface, method_name);

    cryptohome::AccountIdentifier id_from_proto;
    cryptohome::AccountIdentifier id_to_proto;
    FillIdentificationProtobuf(cryptohome_id_from, &id_from_proto);
    FillIdentificationProtobuf(cryptohome_id_to, &id_to_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_from_proto);
    writer.AppendProtoAsArrayOfBytes(id_to_proto);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(), callback));
  }

  // CryptohomeClient override.
  void GetAccountDiskUsage(const cryptohome::Identification& account_id,
                           const ProtobufMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeGetAccountDiskUsage);
    cryptohome::AccountIdentifier id;
    FillIdentificationProtobuf(account_id, &id);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(), callback));
  }

  // CryptohomeClient override.
  void GetSystemSalt(const GetSystemSaltCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeGetSystemSalt);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnGetSystemSalt,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override,
  void GetSanitizedUsername(const cryptohome::Identification& cryptohome_id,
                            const StringDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeGetSanitizedUsername);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnStringMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  std::string BlockingGetSanitizedUsername(
      const cryptohome::Identification& cryptohome_id) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeGetSanitizedUsername);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());

    std::unique_ptr<dbus::Response> response =
        blocking_method_caller_->CallMethodAndBlock(&method_call);

    std::string sanitized_username;
    if (response) {
      dbus::MessageReader reader(response.get());
      reader.PopString(&sanitized_username);
    }

    return sanitized_username;
  }

  // CryptohomeClient override.
  void AsyncMount(const cryptohome::Identification& cryptohome_id,
                  const std::string& key,
                  int flags,
                  const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeAsyncMount);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key);
    writer.AppendBool(flags & cryptohome::CREATE_IF_MISSING);
    writer.AppendBool(flags & cryptohome::ENSURE_EPHEMERAL);
    // deprecated_tracked_subdirectories
    writer.AppendArrayOfStrings(std::vector<std::string>());
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncAddKey(const cryptohome::Identification& cryptohome_id,
                   const std::string& key,
                   const std::string& new_key,
                   const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeAsyncAddKey);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key);
    writer.AppendString(new_key);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncMountGuest(const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeAsyncMountGuest);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncMountPublic(const cryptohome::Identification& public_mount_id,
                        int flags,
                        const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeAsyncMountPublic);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(public_mount_id.id());
    writer.AppendBool(flags & cryptohome::CREATE_IF_MISSING);
    writer.AppendBool(flags & cryptohome::ENSURE_EPHEMERAL);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmIsReady(const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmIsReady);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void TpmIsEnabled(const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmIsEnabled);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  // TODO(hashimoto): Remove this method. crbug.com/141006
  bool CallTpmIsEnabledAndBlock(bool* enabled) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmIsEnabled);
    return CallBoolMethodAndBlock(&method_call, enabled);
  }

  // CryptohomeClient override.
  void TpmGetPassword(const StringDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmGetPassword);
    proxy_->CallMethod(
        &method_call, kTpmDBusTimeoutMs ,
        base::Bind(&CryptohomeClientImpl::OnStringMethod,
                   weak_ptr_factory_.GetWeakPtr(),
                   callback));
  }

  // CryptohomeClient override.
  void TpmIsOwned(const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmIsOwned);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  // TODO(hashimoto): Remove this method. crbug.com/141012
  bool CallTpmIsOwnedAndBlock(bool* owned) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmIsOwned);
    return CallBoolMethodAndBlock(&method_call, owned);
  }

  // CryptohomeClient override.
  void TpmIsBeingOwned(const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmIsBeingOwned);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  // TODO(hashimoto): Remove this method. crbug.com/141011
  bool CallTpmIsBeingOwnedAndBlock(bool* owning) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmIsBeingOwned);
    return CallBoolMethodAndBlock(&method_call, owning);
  }

  // CryptohomeClient override.
  void TpmCanAttemptOwnership(const VoidDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmCanAttemptOwnership);
    CallVoidMethod(&method_call, callback);
  }

  // CryptohomeClient overrides.
  void TpmClearStoredPassword(const VoidDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmClearStoredPassword);
    CallVoidMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  // TODO(hashimoto): Remove this method. crbug.com/141010
  bool CallTpmClearStoredPasswordAndBlock() override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeTpmClearStoredPassword);
    std::unique_ptr<dbus::Response> response(
        blocking_method_caller_->CallMethodAndBlock(&method_call));
    return response.get() != NULL;
  }

  // CryptohomeClient override.
  void Pkcs11IsTpmTokenReady(const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomePkcs11IsTpmTokenReady);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void Pkcs11GetTpmTokenInfo(
      const Pkcs11GetTpmTokenInfoCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomePkcs11GetTpmTokenInfo);
    proxy_->CallMethod(
        &method_call, kTpmDBusTimeoutMs ,
        base::Bind(
            &CryptohomeClientImpl::OnPkcs11GetTpmTokenInfo,
            weak_ptr_factory_.GetWeakPtr(),
            callback));
  }

  // CryptohomeClient override.
  void Pkcs11GetTpmTokenInfoForUser(
      const cryptohome::Identification& cryptohome_id,
      const Pkcs11GetTpmTokenInfoCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomePkcs11GetTpmTokenInfoForUser);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(cryptohome_id.id());
    proxy_->CallMethod(
        &method_call, kTpmDBusTimeoutMs ,
        base::Bind(
            &CryptohomeClientImpl::OnPkcs11GetTpmTokenInfoForUser,
            weak_ptr_factory_.GetWeakPtr(),
            callback));
  }

  // CryptohomeClient override.
  bool InstallAttributesGet(const std::string& name,
                            std::vector<uint8_t>* value,
                            bool* successful) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeInstallAttributesGet);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(name);
    std::unique_ptr<dbus::Response> response(
        blocking_method_caller_->CallMethodAndBlock(&method_call));
    if (!response.get())
      return false;
    dbus::MessageReader reader(response.get());
    const uint8_t* bytes = NULL;
    size_t length = 0;
    if (!reader.PopArrayOfBytes(&bytes, &length) ||
        !reader.PopBool(successful))
      return false;
    value->assign(bytes, bytes + length);
    return true;
  }

  // CryptohomeClient override.
  bool InstallAttributesSet(const std::string& name,
                            const std::vector<uint8_t>& value,
                            bool* successful) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeInstallAttributesSet);
    dbus::MessageWriter writer(&method_call);
    writer.AppendString(name);
    writer.AppendArrayOfBytes(value.data(), value.size());
    return CallBoolMethodAndBlock(&method_call, successful);
  }

  // CryptohomeClient override.
  bool InstallAttributesFinalize(bool* successful) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeInstallAttributesFinalize);
    return CallBoolMethodAndBlock(&method_call, successful);
  }

  // CryptohomeClient override.
  void InstallAttributesIsReady(
      const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeInstallAttributesIsReady);
    return CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  bool InstallAttributesIsInvalid(bool* is_invalid) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeInstallAttributesIsInvalid);
    return CallBoolMethodAndBlock(&method_call, is_invalid);
  }

  // CryptohomeClient override.
  bool InstallAttributesIsFirstInstall(bool* is_first_install) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeInstallAttributesIsFirstInstall);
    return CallBoolMethodAndBlock(&method_call, is_first_install);
  }

  // CryptohomeClient override.
  void TpmAttestationIsPrepared(
      const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmIsAttestationPrepared);
    return CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void TpmAttestationIsEnrolled(
      const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmIsAttestationEnrolled);
    return CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void AsyncTpmAttestationCreateEnrollRequest(
      attestation::PrivacyCAType pca_type,
      const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeAsyncTpmAttestationCreateEnrollRequest);
    dbus::MessageWriter writer(&method_call);
    writer.AppendInt32(pca_type);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncTpmAttestationEnroll(attestation::PrivacyCAType pca_type,
                                 const std::string& pca_response,
                                 const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeAsyncTpmAttestationEnroll);
    dbus::MessageWriter writer(&method_call);
    writer.AppendInt32(pca_type);
    writer.AppendArrayOfBytes(
        reinterpret_cast<const uint8_t*>(pca_response.data()),
        pca_response.size());
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncTpmAttestationCreateCertRequest(
      attestation::PrivacyCAType pca_type,
      attestation::AttestationCertificateProfile certificate_profile,
      const cryptohome::Identification& cryptohome_id,
      const std::string& request_origin,
      const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeAsyncTpmAttestationCreateCertRequest);
    dbus::MessageWriter writer(&method_call);
    writer.AppendInt32(pca_type);
    writer.AppendInt32(certificate_profile);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(request_origin);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void AsyncTpmAttestationFinishCertRequest(
      const std::string& pca_response,
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeAsyncTpmAttestationFinishCertRequest);
    dbus::MessageWriter writer(&method_call);
    writer.AppendArrayOfBytes(
        reinterpret_cast<const uint8_t*>(pca_response.data()),
        pca_response.size());
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmAttestationDoesKeyExist(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationDoesKeyExist);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void TpmAttestationGetCertificate(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const DataMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationGetCertificate);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnDataMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmAttestationGetPublicKey(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const DataMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationGetPublicKey);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnDataMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmAttestationRegisterKey(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationRegisterKey);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmAttestationSignEnterpriseChallenge(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const std::string& domain,
      const std::string& device_id,
      attestation::AttestationChallengeOptions options,
      const std::string& challenge,
      const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationSignEnterpriseChallenge);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    writer.AppendString(domain);
    writer.AppendArrayOfBytes(
        reinterpret_cast<const uint8_t*>(device_id.data()), device_id.size());
    bool include_signed_public_key =
        (options & attestation::CHALLENGE_INCLUDE_SIGNED_PUBLIC_KEY);
    writer.AppendBool(include_signed_public_key);
    writer.AppendArrayOfBytes(
        reinterpret_cast<const uint8_t*>(challenge.data()), challenge.size());
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmAttestationSignSimpleChallenge(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const std::string& challenge,
      const AsyncMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationSignSimpleChallenge);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    writer.AppendArrayOfBytes(
        reinterpret_cast<const uint8_t*>(challenge.data()), challenge.size());
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnAsyncMethodCall,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmAttestationGetKeyPayload(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const DataMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationGetKeyPayload);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnDataMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  // CryptohomeClient override.
  void TpmAttestationSetKeyPayload(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_name,
      const std::string& payload,
      const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationSetKeyPayload);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_name);
    writer.AppendArrayOfBytes(reinterpret_cast<const uint8_t*>(payload.data()),
                              payload.size());
    CallBoolMethod(&method_call, callback);
  }

  // CryptohomeClient override.
  void TpmAttestationDeleteKeys(
      attestation::AttestationKeyType key_type,
      const cryptohome::Identification& cryptohome_id,
      const std::string& key_prefix,
      const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeTpmAttestationDeleteKeys);
    dbus::MessageWriter writer(&method_call);
    bool is_user_specific = (key_type == attestation::KEY_USER);
    writer.AppendBool(is_user_specific);
    writer.AppendString(cryptohome_id.id());
    writer.AppendString(key_prefix);
    CallBoolMethod(&method_call, callback);
  }

  void GetKeyDataEx(const cryptohome::Identification& id,
                    const cryptohome::AuthorizationRequest& auth,
                    const cryptohome::GetKeyDataRequest& request,
                    const ProtobufMethodCallback& callback) override {
    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(id, &id_proto);

    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeGetKeyDataEx);
    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);
    writer.AppendProtoAsArrayOfBytes(auth);
    writer.AppendProtoAsArrayOfBytes(request);

    proxy_->CallMethod(&method_call,
                       kTpmDBusTimeoutMs,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  void CheckKeyEx(const cryptohome::Identification& id,
                  const cryptohome::AuthorizationRequest& auth,
                  const cryptohome::CheckKeyRequest& request,
                  const ProtobufMethodCallback& callback) override {
    const char* method_name = cryptohome::kCryptohomeCheckKeyEx;
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 method_name);

    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(id, &id_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);
    writer.AppendProtoAsArrayOfBytes(auth);
    writer.AppendProtoAsArrayOfBytes(request);

    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                        base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                   weak_ptr_factory_.GetWeakPtr(),
                                   callback));
  }

  void MountEx(const cryptohome::Identification& id,
               const cryptohome::AuthorizationRequest& auth,
               const cryptohome::MountRequest& request,
               const ProtobufMethodCallback& callback) override {
    const char* method_name = cryptohome::kCryptohomeMountEx;
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 method_name);

    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(id, &id_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);
    writer.AppendProtoAsArrayOfBytes(auth);
    writer.AppendProtoAsArrayOfBytes(request);

    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  void AddKeyEx(const cryptohome::Identification& id,
                const cryptohome::AuthorizationRequest& auth,
                const cryptohome::AddKeyRequest& request,
                const ProtobufMethodCallback& callback) override {
    const char* method_name = cryptohome::kCryptohomeAddKeyEx;
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 method_name);

    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(id, &id_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);
    writer.AppendProtoAsArrayOfBytes(auth);
    writer.AppendProtoAsArrayOfBytes(request);

    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  void UpdateKeyEx(const cryptohome::Identification& id,
                   const cryptohome::AuthorizationRequest& auth,
                   const cryptohome::UpdateKeyRequest& request,
                   const ProtobufMethodCallback& callback) override {
    const char* method_name = cryptohome::kCryptohomeUpdateKeyEx;
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 method_name);

    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(id, &id_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);
    writer.AppendProtoAsArrayOfBytes(auth);
    writer.AppendProtoAsArrayOfBytes(request);

    proxy_->CallMethod(&method_call,
                       kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  void RemoveKeyEx(const cryptohome::Identification& id,
                   const cryptohome::AuthorizationRequest& auth,
                   const cryptohome::RemoveKeyRequest& request,
                   const ProtobufMethodCallback& callback) override {
    const char* method_name = cryptohome::kCryptohomeRemoveKeyEx;
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface, method_name);

    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(id, &id_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);
    writer.AppendProtoAsArrayOfBytes(auth);
    writer.AppendProtoAsArrayOfBytes(request);

    proxy_->CallMethod(&method_call,
                       kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  void GetBootAttribute(const cryptohome::GetBootAttributeRequest& request,
                        const ProtobufMethodCallback& callback) override {
    CallCryptohomeMethod(cryptohome::kCryptohomeGetBootAttribute, request,
                         callback);
  }

  void SetBootAttribute(const cryptohome::SetBootAttributeRequest& request,
                        const ProtobufMethodCallback& callback) override {
    CallCryptohomeMethod(cryptohome::kCryptohomeSetBootAttribute, request,
                         callback);
  }

  void FlushAndSignBootAttributes(
      const cryptohome::FlushAndSignBootAttributesRequest& request,
      const ProtobufMethodCallback& callback) override {
    CallCryptohomeMethod(cryptohome::kCryptohomeFlushAndSignBootAttributes,
                         request, callback);
  }

  void RemoveFirmwareManagementParametersFromTpm(
      const cryptohome::RemoveFirmwareManagementParametersRequest& request,
      const ProtobufMethodCallback& callback) override {
    CallCryptohomeMethod(
        cryptohome::kCryptohomeRemoveFirmwareManagementParameters, request,
        callback);
  }

  void SetFirmwareManagementParametersInTpm(
      const cryptohome::SetFirmwareManagementParametersRequest& request,
      const ProtobufMethodCallback& callback) override {
    CallCryptohomeMethod(cryptohome::kCryptohomeSetFirmwareManagementParameters,
                         request, callback);
  }

  void MigrateToDircrypto(const cryptohome::Identification& cryptohome_id,
                          const VoidDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface,
                                 cryptohome::kCryptohomeMigrateToDircrypto);

    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(cryptohome_id, &id_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);

    // The migration progress takes unpredicatable time depending on the
    // user file size and the number. Setting the time limit to infinite.
    proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
                       base::Bind(&CryptohomeClientImpl::OnVoidMethod,
                                  weak_ptr_factory_.GetWeakPtr(), callback));
  }

  void NeedsDircryptoMigration(
      const cryptohome::Identification& cryptohome_id,
      const BoolDBusMethodCallback& callback) override {
    dbus::MethodCall method_call(
        cryptohome::kCryptohomeInterface,
        cryptohome::kCryptohomeNeedsDircryptoMigration);

    cryptohome::AccountIdentifier id_proto;
    FillIdentificationProtobuf(cryptohome_id, &id_proto);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(id_proto);

    proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
                       base::Bind(&CryptohomeClientImpl::OnBoolMethod,
                                  weak_ptr_factory_.GetWeakPtr(), callback));
  }

 protected:
  void Init(dbus::Bus* bus) override {
    proxy_ = bus->GetObjectProxy(
        cryptohome::kCryptohomeServiceName,
        dbus::ObjectPath(cryptohome::kCryptohomeServicePath));

    blocking_method_caller_.reset(new BlockingMethodCaller(bus, proxy_));

    proxy_->ConnectToSignal(cryptohome::kCryptohomeInterface,
                            cryptohome::kSignalAsyncCallStatus,
                            base::Bind(&CryptohomeClientImpl::OnAsyncCallStatus,
                                       weak_ptr_factory_.GetWeakPtr()),
                            base::Bind(&CryptohomeClientImpl::OnSignalConnected,
                                       weak_ptr_factory_.GetWeakPtr()));
    proxy_->ConnectToSignal(
        cryptohome::kCryptohomeInterface,
        cryptohome::kSignalAsyncCallStatusWithData,
        base::Bind(&CryptohomeClientImpl::OnAsyncCallStatusWithData,
                   weak_ptr_factory_.GetWeakPtr()),
        base::Bind(&CryptohomeClientImpl::OnSignalConnected,
                   weak_ptr_factory_.GetWeakPtr()));
    proxy_->ConnectToSignal(cryptohome::kCryptohomeInterface,
                            cryptohome::kSignalLowDiskSpace,
                            base::Bind(&CryptohomeClientImpl::OnLowDiskSpace,
                                       weak_ptr_factory_.GetWeakPtr()),
                            base::Bind(&CryptohomeClientImpl::OnSignalConnected,
                                       weak_ptr_factory_.GetWeakPtr()));
    proxy_->ConnectToSignal(
        cryptohome::kCryptohomeInterface,
        cryptohome::kSignalDircryptoMigrationProgress,
        base::Bind(&CryptohomeClientImpl::OnDircryptoMigrationProgress,
                   weak_ptr_factory_.GetWeakPtr()),
        base::Bind(&CryptohomeClientImpl::OnSignalConnected,
                   weak_ptr_factory_.GetWeakPtr()));
  }

 private:
  // Handles the result of AsyncXXX methods.
  void OnAsyncMethodCall(const AsyncMethodCallback& callback,
                         dbus::Response* response) {
    if (!response) {
      callback.Run(kNotReadyAsyncId);
      return;
    }
    dbus::MessageReader reader(response);
    int async_id = 0;
    if (!reader.PopInt32(&async_id)) {
      LOG(ERROR) << "Invalid response: " << response->ToString();
      return;
    }
    callback.Run(async_id);
  }

  // Handles the result of GetSystemSalt().
  void OnGetSystemSalt(const GetSystemSaltCallback& callback,
                       dbus::Response* response) {
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::vector<uint8_t>());
      return;
    }
    dbus::MessageReader reader(response);
    const uint8_t* bytes = NULL;
    size_t length = 0;
    if (!reader.PopArrayOfBytes(&bytes, &length)) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::vector<uint8_t>());
      return;
    }
    callback.Run(DBUS_METHOD_CALL_SUCCESS,
                 std::vector<uint8_t>(bytes, bytes + length));
  }

  // Calls a method without result values.
  void CallVoidMethod(dbus::MethodCall* method_call,
                      const VoidDBusMethodCallback& callback) {
    proxy_->CallMethod(method_call, kTpmDBusTimeoutMs ,
                       base::Bind(&CryptohomeClientImpl::OnVoidMethod,
                                  weak_ptr_factory_.GetWeakPtr(),
                                  callback));
  }

  void OnVoidMethod(const VoidDBusMethodCallback& callback,
                    dbus::Response* response) {
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE);
      return;
    }
    callback.Run(DBUS_METHOD_CALL_SUCCESS);
  }

  // Calls a method with a bool value reult and block.
  bool CallBoolMethodAndBlock(dbus::MethodCall* method_call,
                              bool* result) {
    std::unique_ptr<dbus::Response> response(
        blocking_method_caller_->CallMethodAndBlock(method_call));
    if (!response.get())
      return false;
    dbus::MessageReader reader(response.get());
    return reader.PopBool(result);
  }

  // Calls a method with a bool value result.
  void CallBoolMethod(dbus::MethodCall* method_call,
                      const BoolDBusMethodCallback& callback) {
    proxy_->CallMethod(method_call, kTpmDBusTimeoutMs ,
                       base::Bind(
                           &CryptohomeClientImpl::OnBoolMethod,
                           weak_ptr_factory_.GetWeakPtr(),
                           callback));
  }

  // Handles responses for methods with a bool value result.
  void OnBoolMethod(const BoolDBusMethodCallback& callback,
                    dbus::Response* response) {
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, false);
      return;
    }
    dbus::MessageReader reader(response);
    bool result = false;
    if (!reader.PopBool(&result)) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, false);
      LOG(ERROR) << "Invalid response: " << response->ToString();
      return;
    }
    callback.Run(DBUS_METHOD_CALL_SUCCESS, result);
  }

  // Handles responses for methods with a string value result.
  void OnStringMethod(const StringDBusMethodCallback& callback,
                      dbus::Response* response) {
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::string());
      return;
    }
    dbus::MessageReader reader(response);
    std::string result;
    if (!reader.PopString(&result)) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::string());
      return;
    }
    callback.Run(DBUS_METHOD_CALL_SUCCESS, result);
  }

  // Handles responses for methods with a bool result and data.
  void OnDataMethod(const DataMethodCallback& callback,
                    dbus::Response* response) {
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, false, std::string());
      return;
    }
    dbus::MessageReader reader(response);
    const uint8_t* data_buffer = NULL;
    size_t data_length = 0;
    bool result = false;
    if (!reader.PopArrayOfBytes(&data_buffer, &data_length) ||
        !reader.PopBool(&result)) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, false, std::string());
      return;
    }
    std::string data(reinterpret_cast<const char*>(data_buffer), data_length);
    callback.Run(DBUS_METHOD_CALL_SUCCESS, result, data);
  }

  // Handles responses for methods with a BaseReply protobuf method.
  void OnBaseReplyMethod(const ProtobufMethodCallback& callback,
                         dbus::Response* response) {
    cryptohome::BaseReply reply;
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, false, reply);
      return;
    }
    dbus::MessageReader reader(response);
    if (!reader.PopArrayOfBytesAsProto(&reply)) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, false, reply);
      return;
    }
    callback.Run(DBUS_METHOD_CALL_SUCCESS, true, reply);
  }

  // Handles responses for Pkcs11GetTpmTokenInfo.
  void OnPkcs11GetTpmTokenInfo(const Pkcs11GetTpmTokenInfoCallback& callback,
                               dbus::Response* response) {
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::string(), std::string(), -1);
      return;
    }
    dbus::MessageReader reader(response);
    std::string label;
    std::string user_pin;
    if (!reader.PopString(&label) || !reader.PopString(&user_pin)) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::string(), std::string(), -1);
      LOG(ERROR) << "Invalid response: " << response->ToString();
      return;
    }
    const int kDefaultSlot = 0;
    callback.Run(DBUS_METHOD_CALL_SUCCESS, label, user_pin, kDefaultSlot);
  }

  // Handles responses for Pkcs11GetTpmTokenInfoForUser.
  void OnPkcs11GetTpmTokenInfoForUser(
      const Pkcs11GetTpmTokenInfoCallback& callback,
      dbus::Response* response) {
    if (!response) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::string(), std::string(), -1);
      return;
    }
    dbus::MessageReader reader(response);
    std::string label;
    std::string user_pin;
    int slot = 0;
    if (!reader.PopString(&label) || !reader.PopString(&user_pin) ||
        !reader.PopInt32(&slot)) {
      callback.Run(DBUS_METHOD_CALL_FAILURE, std::string(), std::string(), -1);
      LOG(ERROR) << "Invalid response: " << response->ToString();
      return;
    }
    callback.Run(DBUS_METHOD_CALL_SUCCESS, label, user_pin, slot);
  }

  // Handles AsyncCallStatus signal.
  void OnAsyncCallStatus(dbus::Signal* signal) {
    dbus::MessageReader reader(signal);
    int async_id = 0;
    bool return_status = false;
    int return_code = 0;
    if (!reader.PopInt32(&async_id) ||
        !reader.PopBool(&return_status) ||
        !reader.PopInt32(&return_code)) {
      LOG(ERROR) << "Invalid signal: " << signal->ToString();
      return;
    }
    if (!async_call_status_handler_.is_null())
      async_call_status_handler_.Run(async_id, return_status, return_code);
  }

  // Handles AsyncCallStatusWithData signal.
  void OnAsyncCallStatusWithData(dbus::Signal* signal) {
    dbus::MessageReader reader(signal);
    int async_id = 0;
    bool return_status = false;
    const uint8_t* return_data_buffer = NULL;
    size_t return_data_length = 0;
    if (!reader.PopInt32(&async_id) ||
        !reader.PopBool(&return_status) ||
        !reader.PopArrayOfBytes(&return_data_buffer, &return_data_length)) {
      LOG(ERROR) << "Invalid signal: " << signal->ToString();
      return;
    }
    if (!async_call_status_data_handler_.is_null()) {
      std::string return_data(reinterpret_cast<const char*>(return_data_buffer),
                              return_data_length);
      async_call_status_data_handler_.Run(async_id, return_status, return_data);
    }
  }

  // Handles LowDiskSpace signal.
  void OnLowDiskSpace(dbus::Signal* signal) {
    dbus::MessageReader reader(signal);
    uint64_t disk_free_bytes = 0;
    if (!reader.PopUint64(&disk_free_bytes)) {
      LOG(ERROR) << "Invalid signal: " << signal->ToString();
      return;
    }
    if (!low_disk_space_handler_.is_null())
      low_disk_space_handler_.Run(disk_free_bytes);
  }

  // Handles DircryptoMigrationProgess signal.
  void OnDircryptoMigrationProgress(dbus::Signal* signal) {
    if (dircrypto_migration_progress_handler_.is_null())
      return;

    dbus::MessageReader reader(signal);
    int status = 0;
    uint64_t current_bytes = 0, total_bytes = 0;
    if (!reader.PopInt32(&status) || !reader.PopUint64(&current_bytes) ||
        !reader.PopUint64(&total_bytes)) {
      LOG(ERROR) << "Invalid signal: " << signal->ToString();
      return;
    }
    dircrypto_migration_progress_handler_.Run(
        static_cast<cryptohome::DircryptoMigrationStatus>(status),
        current_bytes, total_bytes);
  }

  // Handles the result of signal connection setup.
  void OnSignalConnected(const std::string& interface,
                         const std::string& signal,
                         bool succeeded) {
    LOG_IF(ERROR, !succeeded) << "Connect to " << interface << " " <<
        signal << " failed.";
  }

  // Makes an asynchronous D-Bus call, using cryptohome interface. |method_name|
  // is the name of the method to be called. |request| is the specific request
  // for the method, including the data required to be sent. |callback| is
  // invoked when the response is received.
  void CallCryptohomeMethod(const std::string& method_name,
                            const google::protobuf::MessageLite& request,
                            const ProtobufMethodCallback& callback) {
    dbus::MethodCall method_call(cryptohome::kCryptohomeInterface, method_name);

    dbus::MessageWriter writer(&method_call);
    writer.AppendProtoAsArrayOfBytes(request);

    proxy_->CallMethod(&method_call, kTpmDBusTimeoutMs,
                       base::Bind(&CryptohomeClientImpl::OnBaseReplyMethod,
                                  weak_ptr_factory_.GetWeakPtr(), callback));
  }

  dbus::ObjectProxy* proxy_;
  std::unique_ptr<BlockingMethodCaller> blocking_method_caller_;
  AsyncCallStatusHandler async_call_status_handler_;
  AsyncCallStatusWithDataHandler async_call_status_data_handler_;
  LowDiskSpaceHandler low_disk_space_handler_;
  DircryptoMigrationProgessHandler dircrypto_migration_progress_handler_;

  // Note: This should remain the last member so it'll be destroyed and
  // invalidate its weak pointers before any other members are destroyed.
  base::WeakPtrFactory<CryptohomeClientImpl> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(CryptohomeClientImpl);
};

}  // namespace

////////////////////////////////////////////////////////////////////////////////
// CryptohomeClient

CryptohomeClient::CryptohomeClient() {}

CryptohomeClient::~CryptohomeClient() {}

// static
CryptohomeClient* CryptohomeClient::Create() {
  return new CryptohomeClientImpl();
}

// static
std::string CryptohomeClient::GetStubSanitizedUsername(
    const cryptohome::Identification& cryptohome_id) {
  return cryptohome_id.id() + kUserIdStubHashSuffix;
}

}  // namespace chromeos