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// Copyright 2024 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/osauth/impl/engines/cryptohome_fingerprint_engine.h"
#include <string>
#include "ash/constants/ash_pref_names.h"
#include "base/functional/bind.h"
#include "chromeos/ash/components/cryptohome/auth_factor.h"
#include "chromeos/ash/components/dbus/userdataauth/userdataauth_client.h"
#include "chromeos/ash/components/login/auth/auth_performer.h"
#include "chromeos/ash/components/login/auth/public/auth_factors_configuration.h"
#include "chromeos/ash/components/login/auth/public/user_context.h"
#include "components/account_id/account_id.h"
#include "components/prefs/pref_service.h"
#include "components/user_manager/known_user.h"
#include "cryptohome_based_engine.h"
#include "cryptohome_fingerprint_engine.h"
namespace ash {
CryptohomeFingerprintEngine::CryptohomeFingerprintEngine(
CryptohomeCore& core,
PrefService* local_state)
: CryptohomeBasedEngine(core, AshAuthFactor::kFingerprint),
local_state_(local_state) {}
CryptohomeFingerprintEngine::~CryptohomeFingerprintEngine() = default;
std::optional<cryptohome::AuthFactorRef>
CryptohomeFingerprintEngine::LookUpFactor(UserContext& context) {
const cryptohome::AuthFactor* fingerprint_factor =
context.GetAuthFactorsData().FindFactorByType(
cryptohome::AuthFactorType::kFingerprint);
if (!fingerprint_factor) {
return std::nullopt;
}
return fingerprint_factor->ref();
}
// TODO(b/286526858): Policy disabled check.
bool CryptohomeFingerprintEngine::IsDisabledByPolicy() {
return false;
}
// TODO(b/286526858): Lock out check.
bool CryptohomeFingerprintEngine::IsLockedOut() {
return false;
}
// TODO(b/286526858): Factor restriction check.
bool CryptohomeFingerprintEngine::IsFactorSpecificRestricted() {
return false;
}
void CryptohomeFingerprintEngine::SetUsageAllowed(UsageAllowed usage) {
CryptohomeBasedEngine::SetUsageAllowed(usage);
if (usage == UsageAllowed::kEnabled && stage_ == Stage::kPrepared) {
// Immediately trigger the cached fingerprint attempt in parallel.
if (buffered_attempt_) {
buffered_attempt_ = false;
PerformFingerprintAttempt();
return;
}
}
// Run the required preparation for fingerprint auth factor once
// the engine is enabled and not prepared.
if (usage == UsageAllowed::kEnabled && stage_ == Stage::kIdle) {
get_core()->BorrowContext(
base::BindOnce(&CryptohomeFingerprintEngine::PerformPreparation,
weak_factory_.GetWeakPtr()));
return;
}
}
void CryptohomeFingerprintEngine::CleanUp(CleanupCallback callback) {
switch (stage_) {
case Stage::kIdle:
case Stage::kTerminating:
break;
case Stage::kPreparing:
case Stage::kPrepared:
get_core()->BorrowContext(
base::BindOnce(&CryptohomeFingerprintEngine::PerformTermination,
weak_factory_.GetWeakPtr(), std::move(callback)));
return;
}
std::move(callback).Run(GetFactor());
}
void CryptohomeFingerprintEngine::PerformFingerprintAttempt() {
if (get_usage_allowed() == UsageAllowed::kDisabledParallelAttempt) {
// Remember the attempt and trigger it when the usage is changed to enabled.
buffered_attempt_ = true;
return;
}
if (get_usage_allowed() == UsageAllowed::kDisabled) {
// Ignore the attempt.
return;
}
CHECK(get_ref().has_value());
get_observer()->OnFactorAttempt(GetFactor());
get_core()->BorrowContext(
base::BindOnce(&CryptohomeFingerprintEngine::PerformAuthentication,
weak_factory_.GetWeakPtr()));
}
// TODO(b/286526858): auth factor update.
void CryptohomeFingerprintEngine::OnAuthFactorUpdate(
cryptohome::AuthFactorRef factor) {}
void CryptohomeFingerprintEngine::OnFingerprintAuthScan(
const ::user_data_auth::AuthScanDone& result) {
// Implementation detail: |result| currently contains success only, indicating
// a fp touch event. The actual scan/match result will be retrieved by
// AuthPerformer.
PerformFingerprintAttempt();
}
void CryptohomeFingerprintEngine::PerformPreparation(
std::unique_ptr<UserContext> context) {
CHECK_EQ(stage_, Stage::kIdle);
stage_ = Stage::kPreparing;
get_core()->GetAuthPerformer()->PrepareAuthFactor(
std::move(context), cryptohome::AuthFactorType::kFingerprint,
base::BindOnce(&CryptohomeFingerprintEngine::OnPrepareAuthFactor,
weak_factory_.GetWeakPtr()));
}
void CryptohomeFingerprintEngine::PerformAuthentication(
std::unique_ptr<UserContext> context) {
CHECK_EQ(stage_, Stage::kPrepared);
get_core()->GetAuthPerformer()->AuthenticateWithFingerprint(
std::move(context),
base::BindOnce(&CryptohomeFingerprintEngine::OnAuthAttempt,
weak_factory_.GetWeakPtr()));
}
void CryptohomeFingerprintEngine::PerformTermination(
CleanupCallback callback,
std::unique_ptr<UserContext> context) {
CHECK_EQ(stage_, Stage::kPrepared);
stage_ = Stage::kTerminating;
get_core()->GetAuthPerformer()->TerminateAuthFactor(
std::move(context), cryptohome::AuthFactorType::kFingerprint,
base::BindOnce(&CryptohomeFingerprintEngine::OnTerminateAuthFactor,
weak_factory_.GetWeakPtr(), std::move(callback)));
}
void CryptohomeFingerprintEngine::OnAuthAttempt(
std::unique_ptr<UserContext> context,
std::optional<AuthenticationError> error) {
get_core()->ReturnContext(std::move(context));
get_observer()->OnFactorAttemptResult(GetFactor(),
/* success= */ !error.has_value());
}
void CryptohomeFingerprintEngine::OnPrepareAuthFactor(
std::unique_ptr<UserContext> context,
std::optional<AuthenticationError> error) {
CHECK_EQ(stage_, Stage::kPreparing);
get_core()->ReturnContext(std::move(context));
if (error.has_value()) {
LOG(ERROR)
<< "Ignoring fp factor as a fp sensor session fails to initiate.";
return;
}
stage_ = Stage::kPrepared;
}
void CryptohomeFingerprintEngine::OnTerminateAuthFactor(
CleanupCallback callback,
std::unique_ptr<UserContext> context,
std::optional<AuthenticationError> error) {
CHECK_EQ(stage_, Stage::kTerminating);
get_core()->ReturnContext(std::move(context));
// Currently TerminateAuthFactor always succeeds, the error handling code
// below never triggers.
if (error.has_value()) {
LOG(ERROR) << "fp factor fails to terminate a sensor session.";
return;
}
stage_ = Stage::kIdle;
std::move(callback).Run(GetFactor());
}
CryptohomeFingerprintEngineFactory::CryptohomeFingerprintEngineFactory(
PrefService* local_state)
: local_state_(local_state) {}
CryptohomeFingerprintEngineFactory::~CryptohomeFingerprintEngineFactory() =
default;
AshAuthFactor CryptohomeFingerprintEngineFactory::GetFactor() {
return AshAuthFactor::kFingerprint;
}
std::unique_ptr<AuthFactorEngine>
CryptohomeFingerprintEngineFactory::CreateEngine(AuthHubMode mode) {
CHECK(CryptohomeCore::Get());
return std::make_unique<CryptohomeFingerprintEngine>(*CryptohomeCore::Get(),
local_state_);
}
} // namespace ash
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