blob: dc004ed71a16c767c38399817aea077324b9902a [file] [log] [blame]
// 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/cryptohome/system_salt_getter.h"
#include <stdint.h>
#include <utility>
#include "base/bind.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_task_runner_handle.h"
#include "chromeos/dbus/cryptohome/cryptohome_client.h"
namespace chromeos {
namespace {
SystemSaltGetter* g_system_salt_getter = NULL;
} // namespace
SystemSaltGetter::SystemSaltGetter() {}
SystemSaltGetter::~SystemSaltGetter() = default;
void SystemSaltGetter::GetSystemSalt(
const GetSystemSaltCallback& callback) {
if (!system_salt_.empty()) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(callback, system_salt_));
return;
}
CryptohomeClient::Get()->WaitForServiceToBeAvailable(
base::BindOnce(&SystemSaltGetter::DidWaitForServiceToBeAvailable,
weak_ptr_factory_.GetWeakPtr(), callback));
}
void SystemSaltGetter::AddOnSystemSaltReady(const base::Closure& closure) {
if (!raw_salt_.empty()) {
closure.Run();
return;
}
on_system_salt_ready_.push_back(closure);
}
const SystemSaltGetter::RawSalt* SystemSaltGetter::GetRawSalt() const {
return raw_salt_.empty() ? nullptr : &raw_salt_;
}
void SystemSaltGetter::SetRawSaltForTesting(
const SystemSaltGetter::RawSalt& raw_salt) {
raw_salt_ = raw_salt;
}
void SystemSaltGetter::DidWaitForServiceToBeAvailable(
const GetSystemSaltCallback& callback,
bool service_is_available) {
if (!service_is_available) {
LOG(ERROR) << "WaitForServiceToBeAvailable failed.";
callback.Run(std::string());
return;
}
CryptohomeClient::Get()->GetSystemSalt(
base::BindOnce(&SystemSaltGetter::DidGetSystemSalt,
weak_ptr_factory_.GetWeakPtr(), callback));
}
void SystemSaltGetter::DidGetSystemSalt(
const GetSystemSaltCallback& callback,
base::Optional<std::vector<uint8_t>> system_salt) {
if (system_salt.has_value() && !system_salt->empty() &&
system_salt->size() % 2 == 0U) {
raw_salt_ = std::move(system_salt).value();
system_salt_ = ConvertRawSaltToHexString(raw_salt_);
std::vector<base::Closure> callbacks;
callbacks.swap(on_system_salt_ready_);
for (const base::Closure& callback : callbacks) {
callback.Run();
}
} else {
LOG(WARNING) << "System salt not available";
}
callback.Run(system_salt_);
}
// static
void SystemSaltGetter::Initialize() {
CHECK(!g_system_salt_getter);
g_system_salt_getter = new SystemSaltGetter();
}
// static
bool SystemSaltGetter::IsInitialized() {
return g_system_salt_getter;
}
// static
void SystemSaltGetter::Shutdown() {
CHECK(g_system_salt_getter);
delete g_system_salt_getter;
g_system_salt_getter = NULL;
}
// static
SystemSaltGetter* SystemSaltGetter::Get() {
CHECK(g_system_salt_getter)
<< "SystemSaltGetter::Get() called before Initialize()";
return g_system_salt_getter;
}
// static
std::string SystemSaltGetter::ConvertRawSaltToHexString(
const std::vector<uint8_t>& salt) {
return base::ToLowerASCII(
base::HexEncode(reinterpret_cast<const void*>(salt.data()), salt.size()));
}
} // namespace chromeos