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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/cryptohome/system_salt_getter.h"
#include <stdint.h>
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/task/single_thread_task_runner.h"
#include "chromeos/ash/components/dbus/userdataauth/cryptohome_misc_client.h"
namespace ash {
namespace {
SystemSaltGetter* g_system_salt_getter = nullptr;
} // namespace
SystemSaltGetter::SystemSaltGetter() = default;
SystemSaltGetter::~SystemSaltGetter() = default;
void SystemSaltGetter::GetSystemSalt(GetSystemSaltCallback callback) {
if (!system_salt_.empty()) {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), system_salt_));
return;
}
CryptohomeMiscClient::Get()->WaitForServiceToBeAvailable(
base::BindOnce(&SystemSaltGetter::DidWaitForServiceToBeAvailable,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void SystemSaltGetter::AddOnSystemSaltReady(base::OnceClosure closure) {
if (!raw_salt_.empty()) {
std::move(closure).Run();
return;
}
on_system_salt_ready_.push_back(std::move(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(
GetSystemSaltCallback callback,
bool service_is_available) {
if (!service_is_available) {
LOG(ERROR) << "WaitForServiceToBeAvailable failed.";
std::move(callback).Run(std::string());
return;
}
CryptohomeMiscClient::Get()->GetSystemSalt(
::user_data_auth::GetSystemSaltRequest(),
base::BindOnce(&SystemSaltGetter::DidGetSystemSalt,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void SystemSaltGetter::DidGetSystemSalt(
GetSystemSaltCallback system_salt_callback,
std::optional<::user_data_auth::GetSystemSaltReply> system_salt_reply) {
if (system_salt_reply.has_value() && !system_salt_reply->salt().empty() &&
system_salt_reply->salt().size() % 2 == 0U) {
raw_salt_ = RawSalt(system_salt_reply->salt().begin(),
system_salt_reply->salt().end());
system_salt_ = ConvertRawSaltToHexString(raw_salt_);
std::vector<base::OnceClosure> callbacks;
callbacks.swap(on_system_salt_ready_);
for (base::OnceClosure& callback : callbacks) {
std::move(callback).Run();
}
} else {
LOG(WARNING) << "System salt not available";
}
std::move(system_salt_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 = nullptr;
}
// 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(salt));
}
} // namespace ash
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