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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/ash/auth/legacy_fingerprint_engine.h"
#include "ash/constants/ash_features.h"
#include "ash/constants/ash_pref_names.h"
#include "ash/constants/ash_switches.h"
#include "base/command_line.h"
#include "base/containers/contains.h"
#include "base/feature_list.h"
#include "base/notreached.h"
#include "chrome/browser/ash/login/quick_unlock/quick_unlock_utils.h"
#include "chrome/browser/ash/profiles/profile_helper.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chromeos/ash/components/cryptohome/auth_factor.h"
#include "chromeos/ash/components/login/auth/auth_performer.h"
#include "chromeos/ash/components/login/auth/public/auth_callbacks.h"
#include "chromeos/ash/components/login/auth/public/authentication_error.h"
#include "chromeos/ash/components/login/auth/public/user_context.h"
#include "components/prefs/pref_service.h"
namespace ash {
namespace {
const char kFactorsOptionAll[] = "all";
const char kFactorsOptionFingerprint[] = "FINGERPRINT";
bool HasPolicyValue(const PrefService& pref_service,
LegacyFingerprintEngine::Purpose purpose,
const char* value) {
const base::Value::List* factors = nullptr;
switch (purpose) {
case LegacyFingerprintEngine::Purpose::kUnlock:
factors = &pref_service.GetList(prefs::kQuickUnlockModeAllowlist);
break;
case LegacyFingerprintEngine::Purpose::kWebAuthn:
factors = &pref_service.GetList(prefs::kWebAuthnFactors);
break;
default:
return false;
}
return base::Contains(*factors, base::Value(value));
}
// Check if fingerprint is disabled for a specific purpose (so not including
// kAny) by reading the policy value.
bool IsFingerprintDisabledByPolicySinglePurpose(
const PrefService& pref_service,
LegacyFingerprintEngine::Purpose purpose) {
DCHECK(purpose != LegacyFingerprintEngine::Purpose::kAny);
const bool enabled =
HasPolicyValue(pref_service, purpose, kFactorsOptionAll) ||
HasPolicyValue(pref_service, purpose, kFactorsOptionFingerprint);
return !enabled;
}
bool HasRecord(const PrefService& pref_service) {
return pref_service.GetInteger(prefs::kQuickUnlockFingerprintRecord) != 0;
}
} // namespace
LegacyFingerprintEngine::LegacyFingerprintEngine(AuthPerformer* auth_performer)
: auth_performer_(auth_performer) {}
LegacyFingerprintEngine::~LegacyFingerprintEngine() = default;
LegacyFingerprintEngine::Purpose
LegacyFingerprintEngine::FromQuickUnlockPurpose(
quick_unlock::Purpose purpose) const {
switch (purpose) {
case quick_unlock::Purpose::kAny:
return LegacyFingerprintEngine::Purpose::kAny;
case quick_unlock::Purpose::kUnlock:
return LegacyFingerprintEngine::Purpose::kUnlock;
case quick_unlock::Purpose::kWebAuthn:
return LegacyFingerprintEngine::Purpose::kWebAuthn;
case quick_unlock::Purpose::kNumOfPurposes:
NOTREACHED();
}
NOTREACHED();
}
quick_unlock::Purpose LegacyFingerprintEngine::ToQuickUnlockPurpose(
LegacyFingerprintEngine::Purpose purpose) const {
switch (purpose) {
case LegacyFingerprintEngine::Purpose::kAny:
return quick_unlock::Purpose::kAny;
case LegacyFingerprintEngine::Purpose::kUnlock:
return quick_unlock::Purpose::kUnlock;
case LegacyFingerprintEngine::Purpose::kWebAuthn:
return quick_unlock::Purpose::kWebAuthn;
}
NOTREACHED();
}
bool LegacyFingerprintEngine::IsFingerprintDisabledByPolicy(
const PrefService& pref_service,
LegacyFingerprintEngine::Purpose purpose) const {
// TODO(b/274087315): Create a TestApi for this class.
if (auto* test_api = quick_unlock::TestApi::Get();
test_api && test_api->IsQuickUnlockOverridden()) {
return !test_api->IsFingerprintEnabledByPolicy(
ToQuickUnlockPurpose(purpose));
}
if (purpose == LegacyFingerprintEngine::Purpose::kAny) {
return IsFingerprintDisabledByPolicySinglePurpose(
pref_service, LegacyFingerprintEngine::Purpose::kUnlock) &&
IsFingerprintDisabledByPolicySinglePurpose(
pref_service, LegacyFingerprintEngine::Purpose::kWebAuthn);
}
return IsFingerprintDisabledByPolicySinglePurpose(pref_service, purpose);
}
bool IsFingerprintSupported() {
const base::CommandLine* command_line =
base::CommandLine::ForCurrentProcess();
return base::FeatureList::IsEnabled(features::kQuickUnlockFingerprint) &&
command_line->HasSwitch(switches::kFingerprintSensorLocation);
}
bool LegacyFingerprintEngine::IsFingerprintEnabled(
const PrefService& pref_service,
LegacyFingerprintEngine::Purpose purpose) const {
// TODO(b/274087315): Create a TestApi for this class.
if (auto* test_api = quick_unlock::TestApi::Get();
test_api && test_api->IsQuickUnlockOverridden()) {
// When we override behavior for test we don't need to check
// `IsFingerprintSupported`
return !IsFingerprintDisabledByPolicy(pref_service, purpose);
}
return !IsFingerprintDisabledByPolicy(pref_service, purpose) &&
IsFingerprintSupported();
}
bool LegacyFingerprintEngine::IsFingerprintAvailable(
Purpose purpose,
const AccountId& account_id) {
auto* profile = ProfileHelper::Get()->GetProfileByAccountId(account_id);
auto* pref_service = profile->GetPrefs();
if (!pref_service) {
return false;
}
if (profile != ProfileManager::GetPrimaryUserProfile() ||
IsFingerprintDisabledByPolicy(*pref_service, purpose)) {
return false;
}
return HasRecord(*pref_service);
}
void LegacyFingerprintEngine::PrepareLegacyFingerprintFactor(
std::unique_ptr<UserContext> user_context,
AuthOperationCallback callback) {
auth_performer_->PrepareAuthFactor(
std::move(user_context), cryptohome::AuthFactorType::kLegacyFingerprint,
std::move(callback));
}
void LegacyFingerprintEngine::TerminateLegacyFingerprintFactor(
std::unique_ptr<UserContext> user_context,
AuthOperationCallback callback) {
auth_performer_->TerminateAuthFactor(
std::move(user_context), cryptohome::AuthFactorType::kLegacyFingerprint,
std::move(callback));
}
} // namespace ash
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