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// Copyright 2014 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/tpm/tpm_token_loader.h"
#include <algorithm>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/notreached.h"
#include "base/system/sys_info.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "chromeos/ash/components/tpm/tpm_token_info_getter.h"
#include "crypto/nss_util.h"
namespace ash {
namespace {
void PostResultToTaskRunner(scoped_refptr<base::SequencedTaskRunner> runner,
base::OnceCallback<void(bool)> callback,
bool success) {
runner->PostTask(FROM_HERE, base::BindOnce(std::move(callback), success));
}
} // namespace
static TPMTokenLoader* g_tpm_token_loader = NULL;
// static
void TPMTokenLoader::Initialize() {
CHECK(!g_tpm_token_loader);
g_tpm_token_loader = new TPMTokenLoader(/*initialized_for_test=*/false);
}
// static
void TPMTokenLoader::InitializeForTest() {
CHECK(!g_tpm_token_loader);
g_tpm_token_loader = new TPMTokenLoader(/*initialized_for_test=*/true);
}
// static
void TPMTokenLoader::Shutdown() {
CHECK(g_tpm_token_loader);
delete g_tpm_token_loader;
g_tpm_token_loader = NULL;
}
// static
TPMTokenLoader* TPMTokenLoader::Get() {
CHECK(g_tpm_token_loader)
<< "TPMTokenLoader::Get() called before Initialize()";
return g_tpm_token_loader;
}
// static
bool TPMTokenLoader::IsInitialized() {
return g_tpm_token_loader;
}
TPMTokenLoader::TPMTokenLoader(bool initialized_for_test)
: initialized_for_test_(initialized_for_test),
tpm_token_state_(TPM_STATE_UNKNOWN),
tpm_token_info_getter_(TPMTokenInfoGetter::CreateForSystemToken(
CryptohomePkcs11Client::Get(),
base::SingleThreadTaskRunner::GetCurrentDefault())),
tpm_token_slot_id_(-1),
can_start_before_login_(false) {
if (!initialized_for_test_ && LoginState::IsInitialized())
LoginState::Get()->AddObserver(this);
if (initialized_for_test_) {
tpm_token_state_ = TPM_TOKEN_INITIALIZED;
tpm_user_pin_ = "111111";
}
}
void TPMTokenLoader::SetCryptoTaskRunner(
const scoped_refptr<base::SequencedTaskRunner>& crypto_task_runner) {
crypto_task_runner_ = crypto_task_runner;
MaybeStartTokenInitialization();
}
void TPMTokenLoader::EnsureStarted() {
if (can_start_before_login_)
return;
can_start_before_login_ = true;
MaybeStartTokenInitialization();
}
TPMTokenLoader::~TPMTokenLoader() {
if (!initialized_for_test_ && LoginState::IsInitialized())
LoginState::Get()->RemoveObserver(this);
}
bool TPMTokenLoader::IsTPMLoadingEnabled() const {
// TPM loading is enabled on non-ChromeOS environments, e.g. when running
// tests on Linux.
// Treat TPM as disabled for guest users since they do not store certs.
return initialized_for_test_ || enable_tpm_loading_for_testing_ ||
(base::SysInfo::IsRunningOnChromeOS() &&
!LoginState::Get()->IsGuestSessionUser());
}
void TPMTokenLoader::MaybeStartTokenInitialization() {
CHECK(thread_checker_.CalledOnValidThread());
// This is the entry point to the TPM token initialization process,
// which we should do at most once.
if (tpm_token_state_ != TPM_STATE_UNKNOWN || !crypto_task_runner_.get())
return;
bool start_initialization =
(LoginState::IsInitialized() && LoginState::Get()->IsUserLoggedIn()) ||
can_start_before_login_;
VLOG(1) << "StartTokenInitialization: " << start_initialization;
if (!start_initialization)
return;
if (!IsTPMLoadingEnabled())
tpm_token_state_ = TPM_DISABLED;
ContinueTokenInitialization();
DCHECK_NE(tpm_token_state_, TPM_STATE_UNKNOWN);
}
void TPMTokenLoader::ContinueTokenInitialization() {
CHECK(thread_checker_.CalledOnValidThread());
VLOG(1) << "ContinueTokenInitialization: " << tpm_token_state_;
switch (tpm_token_state_) {
case TPM_STATE_UNKNOWN: {
tpm_token_state_ = TPM_INITIALIZATION_STARTED;
tpm_token_info_getter_->Start(base::BindOnce(
&TPMTokenLoader::OnGotTpmTokenInfo, weak_factory_.GetWeakPtr()));
return;
}
case TPM_INITIALIZATION_STARTED: {
NOTREACHED();
}
case TPM_TOKEN_INFO_RECEIVED: {
crypto_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
&crypto::InitializeTPMTokenAndSystemSlot, tpm_token_slot_id_,
base::BindOnce(
&PostResultToTaskRunner,
base::SingleThreadTaskRunner::GetCurrentDefault(),
base::BindOnce(&TPMTokenLoader::OnTPMTokenInitialized,
weak_factory_.GetWeakPtr()))));
return;
}
case TPM_TOKEN_INITIALIZED:
case TPM_DISABLED: {
NotifyTPMTokenReady();
return;
}
}
}
void TPMTokenLoader::OnGotTpmTokenInfo(
std::optional<user_data_auth::TpmTokenInfo> token_info) {
if (!token_info.has_value()) {
tpm_token_state_ = TPM_DISABLED;
ContinueTokenInitialization();
return;
}
tpm_token_slot_id_ = token_info->slot();
tpm_user_pin_ = token_info->user_pin();
tpm_token_state_ = TPM_TOKEN_INFO_RECEIVED;
ContinueTokenInitialization();
}
void TPMTokenLoader::OnTPMTokenInitialized(bool success) {
VLOG(1) << "OnTPMTokenInitialized: " << success;
tpm_token_state_ = success ? TPM_TOKEN_INITIALIZED : TPM_DISABLED;
ContinueTokenInitialization();
}
void TPMTokenLoader::NotifyTPMTokenReady() {
crypto_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&crypto::FinishInitializingTPMTokenAndSystemSlot));
}
void TPMTokenLoader::LoggedInStateChanged() {
VLOG(1) << "LoggedInStateChanged";
MaybeStartTokenInitialization();
}
} // namespace ash
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