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// Copyright 2023 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/attestation/attestation_features.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "base/timer/timer.h"
#include "chromeos/ash/components/dbus/attestation/attestation_ca.pb.h"
#include "chromeos/ash/components/dbus/attestation/attestation_client.h"
#include "chromeos/ash/components/dbus/attestation/interface.pb.h"
#include "chromeos/ash/components/dbus/constants/attestation_constants.h"
namespace ash::attestation {
namespace {
AttestationFeatures* g_attestation_features = nullptr;
bool g_is_ready = false;
// Calling SetForTesting sets this flag. This flag means that the production
// code which calls Initialize and Shutdown will have no effect - the test
// install attributes will remain in place until ShutdownForTesting is called.
bool g_using_attestation_features_for_testing = false;
constexpr base::TimeDelta kPrepareFeaturesTimeout = base::Seconds(60);
constexpr base::TimeDelta kGetFeaturesTimeout = base::Seconds(60);
constexpr base::TimeDelta kRetryDelay = base::Seconds(1);
void GetFeaturesInternal(
base::TimeTicks end_time,
AttestationFeatures::AttestationFeaturesCallback callback) {
if (g_is_ready) {
std::move(callback).Run(g_attestation_features);
return;
}
if (base::TimeTicks::Now() >= end_time) {
std::move(callback).Run(nullptr);
return;
}
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&GetFeaturesInternal, end_time, std::move(callback)),
kRetryDelay);
}
} // namespace
class COMPONENT_EXPORT(CHROMEOS_ASH_COMPONENTS_ATTESTATION)
AttestationFeaturesImpl : public AttestationFeatures {
public:
explicit AttestationFeaturesImpl(AttestationClient* attestation_client);
AttestationFeaturesImpl(const AttestationFeaturesImpl&) = delete;
AttestationFeaturesImpl& operator=(const AttestationFeaturesImpl&) = delete;
~AttestationFeaturesImpl() override;
void Init() override;
bool IsAttestationAvailable() const override;
bool IsRsaSupported() const override;
bool IsEccSupported() const override;
private:
void OnAttestationServiceAvailable(bool service_is_ready);
void PrepareFeatures(base::TimeTicks end_time);
void OnPrepareFeaturesComplete(base::TimeTicks end_time,
const ::attestation::GetFeaturesReply& reply);
bool is_available_ = false;
bool is_rsa_supported_ = false;
bool is_ecc_supported_ = false;
raw_ptr<AttestationClient, DanglingUntriaged> attestation_client_;
base::WeakPtrFactory<AttestationFeaturesImpl> weak_factory_{this};
};
AttestationFeaturesImpl::AttestationFeaturesImpl(
AttestationClient* attestation_client)
: attestation_client_(attestation_client) {}
AttestationFeaturesImpl::~AttestationFeaturesImpl() = default;
// static
void AttestationFeatures::Initialize() {
// Don't reinitialize if a specific instance has already been set for test.
if (g_using_attestation_features_for_testing) {
return;
}
DCHECK(!g_attestation_features);
g_attestation_features =
new AttestationFeaturesImpl(AttestationClient::Get());
g_attestation_features->Init();
}
// static
bool AttestationFeatures::IsInitialized() {
return g_attestation_features;
}
// static
void AttestationFeatures::Shutdown() {
if (g_using_attestation_features_for_testing) {
return;
}
DCHECK(g_attestation_features);
delete g_attestation_features;
g_is_ready = false;
g_attestation_features = nullptr;
}
// static
const AttestationFeatures* AttestationFeatures::Get() {
DCHECK(g_attestation_features);
return g_attestation_features;
}
// static
void AttestationFeatures::GetFeatures(
AttestationFeatures::AttestationFeaturesCallback callback) {
if (g_attestation_features == nullptr) {
LOG(ERROR) << "The attestation features haven't been initialized.";
std::move(callback).Run(nullptr);
return;
}
base::TimeTicks end_time = base::TimeTicks::Now() + kGetFeaturesTimeout;
GetFeaturesInternal(end_time, std::move(callback));
}
// static
void AttestationFeatures::SetForTesting(AttestationFeatures* test_instance) {
DCHECK(!g_attestation_features);
DCHECK(!g_using_attestation_features_for_testing);
g_attestation_features = test_instance;
g_is_ready = true;
g_using_attestation_features_for_testing = true;
}
// static
void AttestationFeatures::ShutdownForTesting() {
DCHECK(g_using_attestation_features_for_testing);
// Don't delete the test instance, we are not the owner.
g_attestation_features = nullptr;
g_is_ready = false;
g_using_attestation_features_for_testing = false;
}
void AttestationFeaturesImpl::Init() {
attestation_client_->WaitForServiceToBeAvailable(
base::BindOnce(&AttestationFeaturesImpl::OnAttestationServiceAvailable,
weak_factory_.GetWeakPtr()));
}
void AttestationFeaturesImpl::OnAttestationServiceAvailable(
bool service_is_ready) {
if (!service_is_ready) {
LOG(ERROR) << "Failed waiting for Attestation D-Bus service availability.";
}
base::TimeTicks end_time = base::TimeTicks::Now() + kPrepareFeaturesTimeout;
PrepareFeatures(end_time);
}
void AttestationFeaturesImpl::PrepareFeatures(base::TimeTicks end_time) {
attestation_client_->GetFeatures(
::attestation::GetFeaturesRequest(),
base::BindOnce(&AttestationFeaturesImpl::OnPrepareFeaturesComplete,
weak_factory_.GetWeakPtr(), end_time));
}
void AttestationFeaturesImpl::OnPrepareFeaturesComplete(
base::TimeTicks end_time,
const ::attestation::GetFeaturesReply& reply) {
if (reply.status() != ::attestation::STATUS_SUCCESS) {
LOG(ERROR) << "Attestation: Failed to get features; status: "
<< reply.status();
if (base::TimeTicks::Now() < end_time) {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&AttestationFeaturesImpl::PrepareFeatures,
weak_factory_.GetWeakPtr(), end_time),
kRetryDelay);
}
return;
}
is_available_ = reply.is_available();
for (auto supported_type : reply.supported_key_types()) {
switch (supported_type) {
case ::attestation::KEY_TYPE_RSA:
is_rsa_supported_ = true;
break;
case ::attestation::KEY_TYPE_ECC:
is_ecc_supported_ = true;
break;
}
}
g_is_ready = true;
}
bool AttestationFeaturesImpl::IsAttestationAvailable() const {
return is_available_;
}
bool AttestationFeaturesImpl::IsRsaSupported() const {
return is_rsa_supported_;
}
bool AttestationFeaturesImpl::IsEccSupported() const {
return is_ecc_supported_;
}
} // namespace ash::attestation
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