blob: a9845662b39e917595abf9098e9cfd7972ce0a0c [file] [log] [blame]
// Copyright 2014 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 "tpm_password_fetcher.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "chromeos/dbus/cryptohome_client.h"
#include "chromeos/dbus/dbus_thread_manager.h"
namespace chromeos {
namespace {
// Interval between TPM password checks.
const int kTpmCheckIntervalMs = 500;
} // namespace
TpmPasswordFetcher::TpmPasswordFetcher(TpmPasswordFetcherDelegate* delegate)
: delegate_(delegate), weak_factory_(this) {
DCHECK(delegate_);
}
TpmPasswordFetcher::~TpmPasswordFetcher() {
}
void TpmPasswordFetcher::Fetch() {
// Since this method is also called directly.
weak_factory_.InvalidateWeakPtrs();
DBusThreadManager::Get()->GetCryptohomeClient()->TpmIsReady(base::Bind(
&TpmPasswordFetcher::OnTpmIsReady, weak_factory_.GetWeakPtr()));
}
void TpmPasswordFetcher::OnTpmIsReady(DBusMethodCallStatus call_status,
bool tpm_is_ready) {
if (call_status == DBUS_METHOD_CALL_SUCCESS && tpm_is_ready) {
DBusThreadManager::Get()->GetCryptohomeClient()->TpmGetPassword(base::Bind(
&TpmPasswordFetcher::OnTpmGetPassword, weak_factory_.GetWeakPtr()));
} else {
// Password hasn't been acquired, reschedule fetch.
RescheduleFetch();
}
}
void TpmPasswordFetcher::OnTpmGetPassword(DBusMethodCallStatus call_status,
const std::string& password) {
if (call_status == DBUS_METHOD_CALL_SUCCESS) {
if (password.empty()) {
// For a fresh OOBE flow TPM is uninitialized,
// ownership process is started at the EULA screen,
// password is cleared after EULA is accepted.
LOG(ERROR) << "TPM returned an empty password.";
}
delegate_->OnPasswordFetched(password);
} else {
// Password hasn't been acquired, reschedule fetch.
RescheduleFetch();
}
}
void TpmPasswordFetcher::RescheduleFetch() {
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE,
base::Bind(&TpmPasswordFetcher::Fetch, weak_factory_.GetWeakPtr()),
base::TimeDelta::FromMilliseconds(kTpmCheckIntervalMs));
}
} // namespace chromeos