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// Copyright (c) 2010 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.
#ifndef CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_WIN_H_
#define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_WIN_H_
#pragma once
#include "base/object_watcher.h"
#include "base/scoped_ptr.h"
#include "base/waitable_event.h"
#include "chrome/browser/policy/configuration_policy_store.h"
#include "chrome/browser/policy/configuration_policy_provider.h"
// An implementation of |ConfigurationPolicyProvider| using the
// mechanism provided by Windows Groups Policy. Policy decisions are
// stored as values in a special section of the Windows Registry.
// On a managed machine in a domain, this portion of the registry is
// periodically updated by the Windows Group Policy machinery to contain
// the latest version of the policy set by administrators.
class ConfigurationPolicyProviderWin : public ConfigurationPolicyProvider {
public:
// Keeps watch on Windows Group Policy notification event to trigger
// a policy reload when Group Policy changes.
class GroupPolicyChangeWatcher : public base::ObjectWatcher::Delegate {
public:
explicit GroupPolicyChangeWatcher(ConfigurationPolicyProvider* provider);
virtual ~GroupPolicyChangeWatcher() {}
virtual void OnObjectSignaled(HANDLE object);
private:
ConfigurationPolicyProvider* provider_;
base::WaitableEvent user_policy_changed_event_;
base::WaitableEvent machine_policy_changed_event_;
base::ObjectWatcher user_policy_watcher_;
base::ObjectWatcher machine_policy_watcher_;
};
ConfigurationPolicyProviderWin();
virtual ~ConfigurationPolicyProviderWin() { }
// ConfigurationPolicyProvider method overrides:
virtual bool Provide(ConfigurationPolicyStore* store);
protected:
// The sub key path for Chromium's Group Policy information in the
// Windows registry.
static const wchar_t kPolicyRegistrySubKey[];
private:
scoped_ptr<GroupPolicyChangeWatcher> watcher_;
// Methods to perform type-specific policy lookups in the registry.
// HKLM is checked first, then HKCU.
// Reads a string registry value |name| and puts the resulting string in
// |result|. If |index| > 0, |name| is the name of a subkey and the value
// read is named |index|. Note: A subkey is used for lists to work around
// a problem with the Group Policy Editor, where one list value overwrites
// another if they appear under the same key (even if they have different
// names).
bool GetRegistryPolicyString(const string16& name,
int index,
string16* result);
// Gets a list value contained under |key| one level below the policy root.
bool GetRegistryPolicyStringList(const string16& key, ListValue* result);
bool GetRegistryPolicyBoolean(const string16& value_name, bool* result);
bool GetRegistryPolicyInteger(const string16& value_name, uint32* result);
};
#endif // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_WIN_H_
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