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// Copyright (c) 2011 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/plugin/policy_hack/nat_policy.h"
#include <userenv.h>
#include "base/compiler_specific.h"
#include "base/string16.h"
#include "base/utf_string_conversions.h"
#include "base/win/registry.h"
#include "base/message_loop_proxy.h"
#include "base/scoped_ptr.h"
#include "base/synchronization/waitable_event.h"
#include "base/values.h"
#include "base/win/object_watcher.h"
// userenv.dll is required for RegisterGPNotification().
#pragma comment(lib, "userenv.lib")
using base::win::RegKey;
namespace remoting {
namespace policy_hack {
namespace {
#if defined(OS_WIN)
#if defined(GOOGLE_CHROME_BUILD)
const wchar_t kRegistrySubKey[] = L"SOFTWARE\\Policies\\Google\\Chrome";
#else
const wchar_t kRegistrySubKey[] = L"SOFTWARE\\Policies\\Chromium";
#endif
#endif
} // namespace
class NatPolicyWin :
public NatPolicy,
public base::win::ObjectWatcher::Delegate {
public:
explicit NatPolicyWin(base::MessageLoopProxy* message_loop_proxy)
: NatPolicy(message_loop_proxy),
user_policy_changed_event_(false, false),
machine_policy_changed_event_(false, false),
user_policy_watcher_failed_(false),
machine_policy_watcher_failed_(false) {
}
virtual ~NatPolicyWin() {
}
virtual void StartWatchingInternal() OVERRIDE {
DCHECK(OnPolicyThread());
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(OnPolicyThread());
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(OnPolicyThread());
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 GetRegistryPolicyInteger(const string16& value_name,
uint32* result) const {
DWORD value = 0;
RegKey policy_key(HKEY_LOCAL_MACHINE, kRegistrySubKey, KEY_READ);
if (policy_key.ReadValueDW(value_name.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.c_str(), &value) == ERROR_SUCCESS) {
*result = value;
return true;
}
}
return false;
}
bool GetRegistryPolicyBoolean(const string16& value_name,
bool* result) const {
uint32 local_result = 0;
bool ret = GetRegistryPolicyInteger(value_name, &local_result);
if (ret)
*result = local_result != 0;
return ret;
}
base::DictionaryValue* Load() {
base::DictionaryValue* policy = new base::DictionaryValue();
bool bool_value;
const string16 name(ASCIIToUTF16(kNatPolicyName));
if (GetRegistryPolicyBoolean(name, &bool_value)) {
policy->SetBoolean(kNatPolicyName, bool_value);
}
return policy;
}
// Post a reload notification and update the watch machinery.
void Reload() {
DCHECK(OnPolicyThread());
SetupWatches();
scoped_ptr<DictionaryValue> new_policy(Load());
UpdateNatPolicy(new_policy.get());
}
// ObjectWatcher::Delegate overrides:
virtual void OnObjectSignaled(HANDLE object) {
DCHECK(OnPolicyThread());
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_;
};
NatPolicy* NatPolicy::Create(base::MessageLoopProxy* message_loop_proxy) {
return new NatPolicyWin(message_loop_proxy);
}
} // namespace policy_hack
} // namespace remoting
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