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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chromeos/system/device_disabling_manager.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/prefs/pref_service.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/browser_process_platform_part.h"
#include "chrome/browser/chromeos/login/existing_user_controller.h"
#include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
#include "chrome/browser/chromeos/policy/enterprise_install_attributes.h"
#include "chrome/browser/chromeos/policy/server_backed_device_state.h"
#include "chrome/common/pref_names.h"
#include "chromeos/chromeos_switches.h"
#include "chromeos/settings/cros_settings_names.h"
#include "chromeos/settings/cros_settings_provider.h"
#include "components/policy/core/common/cloud/cloud_policy_constants.h"
#include "components/user_manager/user_manager.h"
namespace chromeos {
namespace system {
DeviceDisablingManager::Observer::~Observer() {
}
DeviceDisablingManager::Delegate::~Delegate() {
}
DeviceDisablingManager::DeviceDisablingManager(
Delegate* delegate,
CrosSettings* cros_settings,
user_manager::UserManager* user_manager)
: delegate_(delegate),
browser_policy_connector_(g_browser_process->platform_part()->
browser_policy_connector_chromeos()),
cros_settings_(cros_settings),
user_manager_(user_manager),
device_disabled_(false),
weak_factory_(this) {
CHECK(delegate_);
Init();
}
DeviceDisablingManager::~DeviceDisablingManager() {
}
void DeviceDisablingManager::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void DeviceDisablingManager::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
void DeviceDisablingManager::Init() {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableDeviceDisabling)) {
// If device disabling is turned off by flags, do not start monitoring cros
// settings.
return;
}
device_disabled_subscription_ = cros_settings_->AddSettingsObserver(
kDeviceDisabled,
base::Bind(&DeviceDisablingManager::UpdateFromCrosSettings,
weak_factory_.GetWeakPtr()));
disabled_message_subscription_ = cros_settings_->AddSettingsObserver(
kDeviceDisabledMessage,
base::Bind(&DeviceDisablingManager::UpdateFromCrosSettings,
weak_factory_.GetWeakPtr()));
UpdateFromCrosSettings();
}
void DeviceDisablingManager::CacheDisabledMessageAndNotify(
const std::string& disabled_message) {
if (disabled_message == disabled_message_)
return;
disabled_message_ = disabled_message;
FOR_EACH_OBSERVER(Observer,
observers_,
OnDisabledMessageChanged(disabled_message_));
}
void DeviceDisablingManager::CheckWhetherDeviceDisabledDuringOOBE(
const DeviceDisabledCheckCallback& callback) {
if (policy::GetRestoreMode() != policy::RESTORE_MODE_DISABLED ||
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableDeviceDisabling)) {
// Indicate that the device is not disabled if it is not marked as such in
// local state or device disabling has been turned off by flag.
callback.Run(false);
return;
}
if (browser_policy_connector_->GetDeviceMode() ==
policy::DEVICE_MODE_PENDING) {
// If the device mode is not known yet, request to be called back once it
// becomes known.
browser_policy_connector_->GetInstallAttributes()->ReadImmutableAttributes(
base::Bind(
&DeviceDisablingManager::CheckWhetherDeviceDisabledDuringOOBE,
weak_factory_.GetWeakPtr(),
callback));
return;
}
if (browser_policy_connector_->GetDeviceMode() !=
policy::DEVICE_MODE_NOT_SET) {
// If the device is owned already, this method must have been called after
// OOBE, which is an error. Indicate that the device is not disabled to
// prevent spurious disabling. Actual device disabling after OOBE will be
// handled elsewhere, by checking for disabled state in cros settings.
LOG(ERROR) << "CheckWhetherDeviceDisabledDuringOOBE() called after OOBE.";
callback.Run(false);
return;
}
// The device is marked as disabled in local state (based on the device state
// retrieved early during OOBE). Since device disabling has not been turned
// off by flag and the device is still unowned, we honor the information in
// local state and consider the device disabled.
// Update the enrollment domain.
enrollment_domain_.clear();
g_browser_process->local_state()->GetDictionary(
prefs::kServerBackedDeviceState)->GetString(
policy::kDeviceStateManagementDomain,
&enrollment_domain_);
// Update the disabled message.
std::string disabled_message;
g_browser_process->local_state()->GetDictionary(
prefs::kServerBackedDeviceState)->GetString(
policy::kDeviceStateDisabledMessage,
&disabled_message);
CacheDisabledMessageAndNotify(disabled_message);
// Indicate that the device is disabled.
callback.Run(true);
}
// static
bool DeviceDisablingManager::HonorDeviceDisablingDuringNormalOperation() {
// Device disabling should be honored when the device is enterprise managed
// and device disabling has not been turned off by flag.
return g_browser_process->platform_part()
->browser_policy_connector_chromeos()
->IsEnterpriseManaged() &&
!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableDeviceDisabling);
}
void DeviceDisablingManager::UpdateFromCrosSettings() {
if (cros_settings_->PrepareTrustedValues(base::Bind(
&DeviceDisablingManager::UpdateFromCrosSettings,
weak_factory_.GetWeakPtr())) != CrosSettingsProvider::TRUSTED) {
// If the cros settings are not trusted yet, request to be called back
// later.
return;
}
if (!HonorDeviceDisablingDuringNormalOperation()) {
// If the device is not enterprise managed or device disabling has been
// turned of by flag, device disabling is not available.
return;
}
bool should_device_be_disabled = false;
if (!cros_settings_->GetBoolean(kDeviceDisabled,
&should_device_be_disabled) ||
!should_device_be_disabled) {
// The device should not be disabled.
if (!device_disabled_) {
// If the device is currently not disabled, there is nothing to do.
return;
}
// Re-enable the device.
device_disabled_ = false;
// The device was disabled and has been re-enabled. Normal function should
// be resumed. Since the device disabled screen abruptly interrupts the
// regular login screen flows, Chrome should be restarted to return to a
// well-defined state.
delegate_->RestartToLoginScreen();
return;
}
// Update the disabled message.
std::string disabled_message;
cros_settings_->GetString(kDeviceDisabledMessage, &disabled_message);
CacheDisabledMessageAndNotify(disabled_message);
if (device_disabled_) {
// If the device was disabled already, updating the disabled message is the
// only action required.
return;
}
device_disabled_ = true;
const ExistingUserController* existing_user_controller =
ExistingUserController::current_controller();
if (user_manager_->GetActiveUser() ||
(existing_user_controller &&
existing_user_controller->IsSigninInProgress())) {
// If a session or a login is in progress, restart Chrome and return to the
// login screen. Chrome will show the device disabled screen after the
// restart.
delegate_->RestartToLoginScreen();
return;
}
// Cache the enrollment domain.
enrollment_domain_ = browser_policy_connector_->GetEnterpriseDomain();
// If no session or login is in progress, show the device disabled screen.
delegate_->ShowDeviceDisabledScreen();
}
} // namespace system
} // namespace chromeos
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