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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 "attestation_certificate_generator_impl.h"
#include "ash/constants/ash_features.h"
#include "base/functional/bind.h"
#include "base/time/time.h"
#include "chrome/browser/ash/attestation/soft_bind_attestation_flow.h"
#include "chrome/browser/ash/profiles/profile_helper.h"
#include "chromeos/ash/components/multidevice/logging/logging.h"
#include "chromeos/ash/components/network/network_handler.h"
#include "chromeos/ash/components/network/network_state_handler.h"
#include "chromeos/ash/services/device_sync/cryptauth_key_registry_impl.h"
#include "components/user_manager/user.h"
namespace ash::phonehub {
namespace {
constexpr base::TimeDelta kOfflineRetryTimeout = base::Minutes(1);
}
AttestationCertificateGeneratorImpl::AttestationCertificateGeneratorImpl(
Profile* profile,
std::unique_ptr<attestation::SoftBindAttestationFlow>
soft_bind_attestation_flow)
: soft_bind_attestation_flow_(std::move(soft_bind_attestation_flow)),
profile_(profile) {
auto key_registry = device_sync::CryptAuthKeyRegistryImpl::Factory::Create(
profile->GetPrefs());
key_registry_ = std::move(key_registry);
if (NetworkHandler::IsInitialized()) {
NetworkHandler::Get()->network_state_handler()->AddObserver(this,
FROM_HERE);
}
GenerateCertificate();
}
AttestationCertificateGeneratorImpl::~AttestationCertificateGeneratorImpl() {
if (NetworkHandler::IsInitialized()) {
NetworkHandler::Get()->network_state_handler()->RemoveObserver(this,
FROM_HERE);
}
}
bool AttestationCertificateGeneratorImpl::
ShouldRegenerateAttestationCertificate() {
if (!is_valid_) {
return true;
}
if (last_attestation_completed_time_.is_null()) {
return true;
}
if ((base::Time::NowFromSystemTime() - last_attestation_completed_time_) >
base::Hours(24)) {
return true;
}
return false;
}
void AttestationCertificateGeneratorImpl::RetrieveCertificate() {
// TODO(b/278933392): Add a daily task to update certificate.
if (ShouldRegenerateAttestationCertificate()) {
GenerateCertificate();
return;
}
NotifyCertificateGenerated(attestation_certs_, is_valid_);
}
void AttestationCertificateGeneratorImpl::GenerateCertificate() {
const user_manager::User* user =
ProfileHelper::Get()->GetUserByProfile(profile_);
if (user == nullptr) {
PA_LOG(WARNING) << __func__ << ": User unavailable for current profile.";
OnAttestationCertificateGenerated({}, false);
return;
}
const device_sync::CryptAuthKey* user_key_pair = key_registry_->GetActiveKey(
device_sync::CryptAuthKeyBundle::Name::kUserKeyPair);
if (user_key_pair == nullptr) {
PA_LOG(WARNING) << __func__ << ": User missing key pair.";
OnAttestationCertificateGenerated({}, false);
return;
}
soft_bind_attestation_flow_->GetCertificate(
base::BindOnce(&AttestationCertificateGeneratorImpl::
OnAttestationCertificateGenerated,
weak_ptr_factory_.GetWeakPtr()),
user ? user->GetAccountId() : EmptyAccountId(),
user_key_pair->public_key());
}
void AttestationCertificateGeneratorImpl::OnAttestationCertificateGenerated(
const std::vector<std::string>& attestation_certs,
bool is_valid) {
attestation_certs_ = attestation_certs;
is_valid_ = is_valid;
last_attestation_completed_time_ = base::Time::NowFromSystemTime();
NotifyCertificateGenerated(attestation_certs_, is_valid_);
}
void AttestationCertificateGeneratorImpl::DefaultNetworkChanged(
const NetworkState* network) {
// Only retry when we have an active connected network.
if (!network || !network->IsConnectedState()) {
return;
}
// Throttle attempts to prevent too many requests.
if ((base::Time::NowFromSystemTime() -
last_attestation_attempt_from_network_change_time_) <
kOfflineRetryTimeout) {
return;
}
if (ShouldRegenerateAttestationCertificate()) {
last_attestation_attempt_from_network_change_time_ =
base::Time::NowFromSystemTime();
GenerateCertificate();
}
}
} // namespace ash::phonehub
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