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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 "chrome/browser/webauthn/android/cable_registration_state.h"
#include <array>
#include "base/base64.h"
#include "base/compiler_specific.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "crypto/random.h"
#include "device/fido/cable/v2_handshake.h"
#include "device/fido/features.h"
#include "third_party/boringssl/src/include/openssl/ec_key.h"
using device::cablev2::authenticator::Registration;
namespace webauthn::authenticator {
RegistrationState::SystemInterface::~SystemInterface() = default;
RegistrationState::RegistrationState(std::unique_ptr<SystemInterface> interface)
: interface_(std::move(interface)) {}
RegistrationState::~RegistrationState() = default;
void RegistrationState::Register() {
DCHECK(!linking_registration_);
DCHECK(!sync_registration_);
linking_registration_ = interface_->NewRegistration(
device::cablev2::authenticator::Registration::Type::LINKING,
base::BindOnce(&RegistrationState::OnLinkingRegistrationReady,
base::Unretained(this)),
base::BindRepeating(&RegistrationState::OnEvent, base::Unretained(this)));
sync_registration_ = interface_->NewRegistration(
device::cablev2::authenticator::Registration::Type::SYNC,
base::BindOnce(&RegistrationState::OnSyncRegistrationReady,
base::Unretained(this)),
base::BindRepeating(&RegistrationState::OnEvent, base::Unretained(this)));
interface_->CanDeviceSupportCable(base::BindOnce(
&RegistrationState::OnDeviceSupportResult, base::Unretained(this)));
interface_->AmInWorkProfile(base::BindOnce(
&RegistrationState::OnWorkProfileResult, base::Unretained(this)));
}
// have_data_for_sync returns true if this object has loaded enough state to
// put information into sync's DeviceInfo.
bool RegistrationState::have_data_for_sync() const {
return device_supports_cable_.has_value() &&
am_in_work_profile_.has_value() && sync_registration_ != nullptr &&
sync_registration_->contact_id() && have_play_services_data();
}
void RegistrationState::SignalSyncWhenReady() {
if (sync_registration_ && !sync_registration_->contact_id()) {
sync_registration_->PrepareContactID();
}
if (!have_play_services_data() && !play_services_query_pending_) {
QueryPlayServices();
}
signal_sync_when_ready_ = true;
}
bool RegistrationState::have_play_services_data() const {
// If there's no result, then we're not ready.
if (!have_link_data_from_play_services_) {
return false;
}
// If there's a query already pending then the result must be stale and
// there's nothing more to do here.
if (play_services_query_pending_) {
return false;
}
const base::TimeDelta staleness =
base::TimeTicks::Now() - link_data_from_play_services_timeticks_;
return staleness < base::Hours(12);
}
void RegistrationState::QueryPlayServices() {
DCHECK(!play_services_query_pending_);
play_services_query_pending_ = true;
interface_->GetPrelinkFromPlayServices(
base::BindOnce(&RegistrationState::OnHavePlayServicesLinkingInformation,
base::Unretained(this)));
}
void RegistrationState::OnHavePlayServicesLinkingInformation(
std::optional<std::vector<uint8_t>> cbor) {
DCHECK(play_services_query_pending_);
play_services_query_pending_ = false;
link_data_from_play_services_ = std::move(cbor);
have_link_data_from_play_services_ = true;
link_data_from_play_services_timeticks_ = base::TimeTicks::Now();
MaybeSignalSync();
}
void RegistrationState::OnLinkingRegistrationReady() {
MaybeFlushPendingEvent();
}
void RegistrationState::OnSyncRegistrationReady() {
MaybeSignalSync();
}
void RegistrationState::OnEvent(std::unique_ptr<Registration::Event> event) {
pending_event_ = std::move(event);
MaybeFlushPendingEvent();
}
void RegistrationState::MaybeFlushPendingEvent() {
if (!pending_event_) {
return;
}
if (pending_event_->source == Registration::Type::LINKING &&
!pending_event_->contact_id) {
// This GCM message is from a QR-linked peer so it needs the contact ID
// to be processed.
pending_event_->contact_id = linking_registration_->contact_id();
if (!pending_event_->contact_id) {
// The contact ID isn't ready yet. Wait until it is.
linking_registration_->PrepareContactID();
return;
}
}
std::unique_ptr<Registration::Event> event(std::move(pending_event_));
if (event->source == Registration::Type::SYNC) {
// If this is from a synced peer then we limit how old the keys can be.
// Clank will update its device information once per day (when launched)
// and we piggyback on that to transmit fresh keys. Therefore syncing
// peers should have reasonably recent information.
uint64_t id;
static_assert(std::tuple_size_v<decltype(event->pairing_id)> == sizeof(id));
UNSAFE_TODO(memcpy(&id, event->pairing_id.data(), sizeof(id)));
// A maximum age is enforced for sync secrets so that any leak of
// information isn't valid forever. The desktop ignores DeviceInfo
// records with information that is too old so this should never happen
// with honest clients.
if (id > std::numeric_limits<uint32_t>::max() ||
device::cablev2::sync::IDIsMoreThanNPeriodsOld(
static_cast<uint32_t>(id),
device::cablev2::kMaxSyncInfoDaysForProducer)) {
return;
}
}
}
void RegistrationState::MaybeSignalSync() {
if (!signal_sync_when_ready_ || !have_data_for_sync()) {
return;
}
signal_sync_when_ready_ = false;
interface_->RefreshLocalDeviceInfo();
}
void RegistrationState::OnDeviceSupportResult(bool result) {
device_supports_cable_ = result;
MaybeSignalSync();
}
void RegistrationState::OnWorkProfileResult(bool result) {
am_in_work_profile_ = result;
MaybeSignalSync();
}
} // namespace webauthn::authenticator
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