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// Copyright (c) 2012 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.
// Most of this code is copied from various classes in
// src/chrome/browser/policy. In particular, look at
//
// configuration_policy_provider_delegate_win.{h,cc}
// configuration_policy_loader_win.{h,cc}
//
// This is a reduction of the functionality in those classes.
#include "remoting/host/policy_hack/policy_watcher.h"
#include <userenv.h>
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/strings/string16.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/waitable_event.h"
#include "base/values.h"
#include "base/win/object_watcher.h"
#include "base/win/registry.h"
// userenv.dll is required for RegisterGPNotification().
#pragma comment(lib, "userenv.lib")
using base::win::RegKey;
namespace remoting {
namespace policy_hack {
namespace {
const wchar_t kRegistrySubKey[] = L"SOFTWARE\\Policies\\Google\\Chrome";
} // namespace
class PolicyWatcherWin :
public PolicyWatcher,
public base::win::ObjectWatcher::Delegate {
public:
explicit PolicyWatcherWin(
scoped_refptr<base::SingleThreadTaskRunner> task_runner)
: PolicyWatcher(task_runner),
user_policy_changed_event_(false, false),
machine_policy_changed_event_(false, false),
user_policy_watcher_failed_(false),
machine_policy_watcher_failed_(false) {
}
virtual ~PolicyWatcherWin() {
}
virtual void StartWatchingInternal() OVERRIDE {
DCHECK(OnPolicyWatcherThread());
if (!RegisterGPNotification(user_policy_changed_event_.handle(), false)) {
PLOG(WARNING) << "Failed to register user group policy notification";
user_policy_watcher_failed_ = true;
}
if (!RegisterGPNotification(machine_policy_changed_event_.handle(), true)) {
PLOG(WARNING) << "Failed to register machine group policy notification.";
machine_policy_watcher_failed_ = true;
}
Reload();
}
virtual void StopWatchingInternal() OVERRIDE {
DCHECK(OnPolicyWatcherThread());
if (!UnregisterGPNotification(user_policy_changed_event_.handle())) {
PLOG(WARNING) << "Failed to unregister user group policy notification";
}
if (!UnregisterGPNotification(machine_policy_changed_event_.handle())) {
PLOG(WARNING) <<
"Failed to unregister machine group policy notification.";
}
user_policy_watcher_.StopWatching();
machine_policy_watcher_.StopWatching();
}
private:
// Updates the watchers and schedules the reload task if appropriate.
void SetupWatches() {
DCHECK(OnPolicyWatcherThread());
if (!user_policy_watcher_failed_ &&
!user_policy_watcher_.GetWatchedObject() &&
!user_policy_watcher_.StartWatching(
user_policy_changed_event_.handle(), this)) {
LOG(WARNING) << "Failed to start watch for user policy change event";
user_policy_watcher_failed_ = true;
}
if (!machine_policy_watcher_failed_ &&
!machine_policy_watcher_.GetWatchedObject() &&
!machine_policy_watcher_.StartWatching(
machine_policy_changed_event_.handle(), this)) {
LOG(WARNING) << "Failed to start watch for machine policy change event";
machine_policy_watcher_failed_ = true;
}
if (user_policy_watcher_failed_ || machine_policy_watcher_failed_) {
ScheduleFallbackReloadTask();
}
}
bool GetRegistryPolicyString(const std::string& value_name,
std::string* result) const {
// presubmit: allow wstring
std::wstring value_name_wide = UTF8ToWide(value_name);
// presubmit: allow wstring
std::wstring value;
RegKey policy_key(HKEY_LOCAL_MACHINE, kRegistrySubKey, KEY_READ);
if (policy_key.ReadValue(value_name_wide.c_str(), &value) ==
ERROR_SUCCESS) {
*result = WideToUTF8(value);
return true;
}
if (policy_key.Open(HKEY_CURRENT_USER, kRegistrySubKey, KEY_READ) ==
ERROR_SUCCESS) {
if (policy_key.ReadValue(value_name_wide.c_str(), &value) ==
ERROR_SUCCESS) {
*result = WideToUTF8(value);
return true;
}
}
return false;
}
bool GetRegistryPolicyInteger(const std::string& value_name,
uint32* result) const {
// presubmit: allow wstring
std::wstring value_name_wide = UTF8ToWide(value_name);
DWORD value = 0;
RegKey policy_key(HKEY_LOCAL_MACHINE, kRegistrySubKey, KEY_READ);
if (policy_key.ReadValueDW(value_name_wide.c_str(), &value) ==
ERROR_SUCCESS) {
*result = value;
return true;
}
if (policy_key.Open(HKEY_CURRENT_USER, kRegistrySubKey, KEY_READ) ==
ERROR_SUCCESS) {
if (policy_key.ReadValueDW(value_name_wide.c_str(), &value) ==
ERROR_SUCCESS) {
*result = value;
return true;
}
}
return false;
}
bool GetRegistryPolicyBoolean(const std::string& value_name,
bool* result) const {
uint32 local_result = 0;
bool ret = GetRegistryPolicyInteger(value_name, &local_result);
if (ret)
*result = local_result != 0;
return ret;
}
scoped_ptr<base::DictionaryValue> Load() {
scoped_ptr<base::DictionaryValue> policy(new base::DictionaryValue());
for (base::DictionaryValue::Iterator i(Defaults());
!i.IsAtEnd(); i.Advance()) {
const std::string& policy_name = i.key();
if (i.value().GetType() == base::DictionaryValue::TYPE_BOOLEAN) {
bool bool_value;
if (GetRegistryPolicyBoolean(policy_name, &bool_value)) {
policy->SetBoolean(policy_name, bool_value);
}
}
if (i.value().GetType() == base::DictionaryValue::TYPE_STRING) {
std::string string_value;
if (GetRegistryPolicyString(policy_name, &string_value)) {
policy->SetString(policy_name, string_value);
}
}
}
return policy.Pass();
}
// Post a reload notification and update the watch machinery.
void Reload() {
DCHECK(OnPolicyWatcherThread());
SetupWatches();
scoped_ptr<base::DictionaryValue> new_policy(Load());
UpdatePolicies(new_policy.get());
}
// ObjectWatcher::Delegate overrides:
virtual void OnObjectSignaled(HANDLE object) {
DCHECK(OnPolicyWatcherThread());
DCHECK(object == user_policy_changed_event_.handle() ||
object == machine_policy_changed_event_.handle())
<< "unexpected object signaled policy reload, obj = "
<< std::showbase << std::hex << object;
Reload();
}
base::WaitableEvent user_policy_changed_event_;
base::WaitableEvent machine_policy_changed_event_;
base::win::ObjectWatcher user_policy_watcher_;
base::win::ObjectWatcher machine_policy_watcher_;
bool user_policy_watcher_failed_;
bool machine_policy_watcher_failed_;
};
PolicyWatcher* PolicyWatcher::Create(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
return new PolicyWatcherWin(task_runner);
}
} // namespace policy_hack
} // namespace remoting
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