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// Copyright 2019 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/app_mode/kiosk_cryptohome_remover.h"
#include <string>
#include <utility>
#include "base/barrier_closure.h"
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/logging.h"
#include "chrome/browser/ash/app_mode/pref_names.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/lifetime/application_lifetime.h"
#include "chromeos/ash/components/cryptohome/error_util.h"
#include "chromeos/ash/components/cryptohome/userdataauth_util.h"
#include "chromeos/ash/components/dbus/userdataauth/userdataauth_client.h"
#include "components/account_id/account_id.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
#include "components/prefs/scoped_user_pref_update.h"
#include "components/user_manager/user.h"
#include "components/user_manager/user_manager.h"
#include "third_party/cros_system_api/dbus/cryptohome/dbus-constants.h"
namespace ash {
namespace {
void ScheduleDelayedCryptohomeRemoval(const AccountId& account_id) {
PrefService* const local_state = g_browser_process->local_state();
{
ScopedDictPrefUpdate dict_update(local_state,
prefs::kAllKioskUsersToRemove);
dict_update->Set(cryptohome::Identification(account_id).id(),
account_id.GetUserEmail());
}
local_state->CommitPendingWrite();
}
void UnscheduleDelayedCryptohomeRemoval(const cryptohome::Identification& id) {
PrefService* const local_state = g_browser_process->local_state();
{
ScopedDictPrefUpdate dict_update(local_state,
prefs::kAllKioskUsersToRemove);
dict_update->Remove(id.id());
}
local_state->CommitPendingWrite();
}
void OnRemoveAppCryptohomeComplete(
const cryptohome::Identification& id,
base::OnceClosure callback,
std::optional<user_data_auth::RemoveReply> reply) {
cryptohome::ErrorWrapper error = ReplyToCryptohomeError(reply);
if (!cryptohome::HasError(error) ||
cryptohome::ErrorMatches(
error, user_data_auth::CRYPTOHOME_ERROR_ACCOUNT_NOT_FOUND)) {
UnscheduleDelayedCryptohomeRemoval(id);
}
if (callback) {
std::move(callback).Run();
}
}
void PerformDelayedCryptohomeRemovals(bool service_is_available) {
if (!service_is_available) {
LOG(ERROR) << "Cryptohome client is not avaiable.";
return;
}
PrefService* local_state = g_browser_process->local_state();
const base::Value::Dict& dict =
local_state->GetDict(prefs::kAllKioskUsersToRemove);
for (const auto it : dict) {
std::string app_id;
if (it.second.is_string()) {
app_id = it.second.GetString();
}
VLOG(1) << "Removing obsolete cryptohome for " << app_id;
const cryptohome::Identification cryptohome_id(
cryptohome::Identification::FromString(it.first));
cryptohome::AccountIdentifier account_id_proto;
account_id_proto.set_account_id(cryptohome_id.id());
user_data_auth::RemoveRequest request;
*request.mutable_identifier() = account_id_proto;
UserDataAuthClient::Get()->Remove(
request, base::BindOnce(&OnRemoveAppCryptohomeComplete, cryptohome_id,
base::OnceClosure()));
}
}
} // namespace
void KioskCryptohomeRemover::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterDictionaryPref(prefs::kAllKioskUsersToRemove);
}
void KioskCryptohomeRemover::RemoveObsoleteCryptohomes() {
auto* client = UserDataAuthClient::Get();
client->WaitForServiceToBeAvailable(
base::BindOnce(&PerformDelayedCryptohomeRemovals));
}
void KioskCryptohomeRemover::CancelDelayedCryptohomeRemoval(
const AccountId& account_id) {
UnscheduleDelayedCryptohomeRemoval(cryptohome::Identification(account_id));
}
void KioskCryptohomeRemover::RemoveCryptohomesAndExitIfNeeded(
const std::vector<AccountId>& account_ids) {
base::RepeatingClosure cryptohomes_barrier_closure;
const user_manager::User* active_user =
user_manager::UserManager::Get()->GetActiveUser();
AccountId active_account_id;
if (active_user) {
active_account_id = active_user->GetAccountId();
}
if (base::Contains(account_ids, active_account_id)) {
cryptohomes_barrier_closure = BarrierClosure(
account_ids.size() - 1, base::BindOnce(&chrome::AttemptUserExit));
}
// First schedule cryptohome removal in case there is a power failure during
// cryptohome calls.
for (const auto& account_id : account_ids) {
ScheduleDelayedCryptohomeRemoval(account_id);
}
for (auto& account_id : account_ids) {
if (account_id != active_account_id) {
user_data_auth::RemoveRequest request;
const cryptohome::Identification cryptohome_id(account_id);
request.mutable_identifier()->set_account_id(cryptohome_id.id());
UserDataAuthClient::Get()->Remove(
request, base::BindOnce(&OnRemoveAppCryptohomeComplete, cryptohome_id,
cryptohomes_barrier_closure));
}
}
}
} // namespace ash
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