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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/cryptohome_pin_engine.h"
#include "ash/constants/ash_pref_names.h"
#include "base/check_deref.h"
#include "base/check_op.h"
#include "base/containers/contains.h"
#include "base/memory/raw_ref.h"
#include "chrome/browser/ash/login/users/chrome_user_manager_util.h"
#include "chrome/browser/ash/profiles/profile_helper.h"
#include "chrome/browser/profiles/profile.h"
#include "chromeos/ash/components/login/auth/auth_performer.h"
#include "components/account_id/account_id.h"
#include "components/prefs/pref_service.h"
#include "components/user_manager/known_user.h"
namespace ash::legacy {
namespace {
// Possible values for the `kQuickUnlockModeAllowlist` policy.
constexpr char kFactorsOptionAll[] = "all";
constexpr char kFactorsOptionPin[] = "PIN";
bool HasPolicyValue(const PrefService& pref_service,
CryptohomePinEngine::Purpose purpose,
const char* value) {
const base::Value::List* factors = nullptr;
switch (purpose) {
case CryptohomePinEngine::Purpose::kUnlock:
factors = &pref_service.GetList(prefs::kQuickUnlockModeAllowlist);
break;
case CryptohomePinEngine::Purpose::kWebAuthn:
factors = &pref_service.GetList(prefs::kWebAuthnFactors);
break;
default:
return false;
}
return base::Contains(*factors, base::Value(value));
}
// Check if pin is disabled for a specific purpose (so not including
// kAny) by reading the policy value.
bool IsPinDisabledByPolicySinglePurpose(const PrefService& pref_service,
CryptohomePinEngine::Purpose purpose) {
DCHECK_NE(purpose, CryptohomePinEngine::Purpose::kAny);
const bool enabled =
HasPolicyValue(pref_service, purpose, kFactorsOptionAll) ||
HasPolicyValue(pref_service, purpose, kFactorsOptionPin);
return !enabled;
}
// Read the salt from local state.
std::string GetUserSalt(PrefService& local_state, const AccountId& account_id) {
user_manager::KnownUser known_user(&local_state);
if (const std::string* salt =
known_user.FindStringPath(account_id, prefs::kQuickUnlockPinSalt)) {
return *salt;
}
return {};
}
} // namespace
CryptohomePinEngine::CryptohomePinEngine(PrefService* local_state,
ash::AuthPerformer* auth_performer)
: local_state_(CHECK_DEREF(local_state)),
auth_performer_(auth_performer),
auth_factor_editor_(ash::UserDataAuthClient::Get()) {}
CryptohomePinEngine::~CryptohomePinEngine() = default;
std::optional<bool> CryptohomePinEngine::IsCryptohomePinDisabledByPolicy(
const AccountId& account_id,
CryptohomePinEngine::Purpose purpose) const {
Profile* profile =
ash::ProfileHelper::Get()->GetProfileByAccountId(account_id);
if (!profile) {
return std::nullopt;
}
auto* pref_service = profile->GetPrefs();
if (!pref_service) {
return std::nullopt;
}
if (purpose == CryptohomePinEngine::Purpose::kAny) {
return IsPinDisabledByPolicySinglePurpose(
*pref_service, CryptohomePinEngine::Purpose::kUnlock) &&
IsPinDisabledByPolicySinglePurpose(
*pref_service, CryptohomePinEngine::Purpose::kWebAuthn);
}
return IsPinDisabledByPolicySinglePurpose(*pref_service, purpose);
}
bool CryptohomePinEngine::ShouldSkipSetupBecauseOfPolicy(
const AccountId& account_id) const {
std::optional<bool> is_pin_disabled = IsCryptohomePinDisabledByPolicy(
account_id, CryptohomePinEngine::Purpose::kAny);
return is_pin_disabled.value_or(false);
}
void CryptohomePinEngine::IsPinAuthAvailable(
Purpose purpose,
std::unique_ptr<UserContext> user_context,
IsPinAuthAvailableCallback callback) {
auto is_pin_disabled_by_policy =
IsCryptohomePinDisabledByPolicy(user_context->GetAccountId(), purpose);
if (!is_pin_disabled_by_policy.has_value() ||
is_pin_disabled_by_policy.value()) {
std::move(callback).Run(false, std::move(user_context));
return;
}
CheckCryptohomePinFactor(std::move(user_context), std::move(callback));
}
void CryptohomePinEngine::Authenticate(
const cryptohome::RawPin& pin,
std::unique_ptr<UserContext> user_context,
AuthOperationCallback callback) {
auto salt = GetUserSalt(local_state_.get(), user_context->GetAccountId());
auth_performer_->AuthenticateWithPin(*pin, salt, std::move(user_context),
std::move(callback));
}
void CryptohomePinEngine::CheckCryptohomePinFactor(
std::unique_ptr<UserContext> user_context,
IsPinAuthAvailableCallback callback) {
auth_factor_editor_.GetAuthFactorsConfiguration(
std::move(user_context),
base::BindOnce(&CryptohomePinEngine::OnGetAuthFactorsConfiguration,
weak_factory_.GetWeakPtr(), std::move(callback)));
}
void CryptohomePinEngine::OnGetAuthFactorsConfiguration(
IsPinAuthAvailableCallback callback,
std::unique_ptr<UserContext> user_context,
std::optional<AuthenticationError> error) {
if (error.has_value()) {
std::move(callback).Run(false, std::move(user_context));
return;
}
const auto& config = user_context->GetAuthFactorsConfiguration();
const cryptohome::AuthFactor* pin_factor =
config.FindFactorByType(cryptohome::AuthFactorType::kPin);
if (!pin_factor || pin_factor->GetPinStatus().IsLockedFactor()) {
std::move(callback).Run(false, std::move(user_context));
return;
}
std::move(callback).Run(true, std::move(user_context));
}
} // namespace ash::legacy
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