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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.
#include "chrome/browser/configuration_policy_provider_win.h"
#include <userenv.h>
#include <algorithm>
#include "base/logging.h"
#include "base/object_watcher.h"
#include "base/registry.h"
#include "base/scoped_ptr.h"
#include "base/string_piece.h"
#include "base/sys_string_conversions.h"
#include "base/utf_string_conversions.h"
#include "base/values.h"
#include "base/waitable_event.h"
#include "chrome/common/policy_constants.h"
ConfigurationPolicyProviderWin::GroupPolicyChangeWatcher::
GroupPolicyChangeWatcher(ConfigurationPolicyProvider* provider)
: provider_(provider),
user_policy_changed_event_(false, false),
machine_policy_changed_event_(false, false) {
CHECK(RegisterGPNotification(user_policy_changed_event_.handle(), false));
CHECK(RegisterGPNotification(machine_policy_changed_event_.handle(), true));
user_policy_watcher_.StartWatching(
user_policy_changed_event_.handle(),
this);
machine_policy_watcher_.StartWatching(
machine_policy_changed_event_.handle(),
this);
}
void ConfigurationPolicyProviderWin::GroupPolicyChangeWatcher::
OnObjectSignaled(HANDLE object) {
provider_->NotifyStoreOfPolicyChange();
if (object == user_policy_changed_event_.handle()) {
user_policy_watcher_.StartWatching(
user_policy_changed_event_.handle(),
this);
} else if (object == machine_policy_changed_event_.handle()) {
machine_policy_watcher_.StartWatching(
machine_policy_changed_event_.handle(),
this);
} else {
// This method should only be called as a result of signals
// to the user- and machine-policy handle watchers.
NOTREACHED();
}
}
ConfigurationPolicyProviderWin::ConfigurationPolicyProviderWin() {
watcher_.reset(new GroupPolicyChangeWatcher(this));
}
bool ConfigurationPolicyProviderWin::GetRegistryPolicyString(
const wchar_t* value_name, string16* result) {
DWORD value_size = 0;
DWORD key_type = 0;
scoped_array<uint8> buffer;
RegKey hkcu_policy_key(HKEY_LOCAL_MACHINE, policy::kRegistrySubKey);
if (hkcu_policy_key.ReadValue(value_name, 0, &value_size, &key_type)) {
if (key_type != REG_SZ)
return false;
// According to the Microsoft documentation, the string
// buffer may not be explicitly 0-terminated. Allocate a
// slightly larger buffer and prefill to zeros to guarantee
// the 0-termination.
buffer.reset(new uint8[value_size + 2]);
memset(buffer.get(), 0, value_size + 2);
hkcu_policy_key.ReadValue(value_name, buffer.get(), &value_size);
} else {
RegKey hklm_policy_key(HKEY_CURRENT_USER, policy::kRegistrySubKey);
if (hklm_policy_key.ReadValue(value_name, 0, &value_size, &key_type)) {
if (key_type != REG_SZ)
return false;
// According to the Microsoft documentation, the string
// buffer may not be explicitly 0-terminated. Allocate a
// slightly larger buffer and prefill to zeros to guarantee
// the 0-termination.
buffer.reset(new uint8[value_size + 2]);
memset(buffer.get(), 0, value_size + 2);
hklm_policy_key.ReadValue(value_name, buffer.get(), &value_size);
} else {
return false;
}
}
result->assign(reinterpret_cast<const wchar_t*>(buffer.get()));
return true;
}
bool ConfigurationPolicyProviderWin::GetRegistryPolicyBoolean(
const wchar_t* value_name, bool* result) {
DWORD value;
RegKey hkcu_policy_key(HKEY_LOCAL_MACHINE, policy::kRegistrySubKey);
if (hkcu_policy_key.ReadValueDW(value_name, &value)) {
*result = value != 0;
return true;
}
RegKey hklm_policy_key(HKEY_CURRENT_USER, policy::kRegistrySubKey);
if (hklm_policy_key.ReadValueDW(value_name, &value)) {
*result = value != 0;
return true;
}
return false;
}
bool ConfigurationPolicyProviderWin::GetRegistryPolicyInteger(
const wchar_t* value_name, uint32* result) {
DWORD value;
RegKey hkcu_policy_key(HKEY_LOCAL_MACHINE, policy::kRegistrySubKey);
if (hkcu_policy_key.ReadValueDW(value_name, &value)) {
*result = value;
return true;
}
RegKey hklm_policy_key(HKEY_CURRENT_USER, policy::kRegistrySubKey);
if (hklm_policy_key.ReadValueDW(value_name, &value)) {
*result = value;
return true;
}
return false;
}
bool ConfigurationPolicyProviderWin::Provide(
ConfigurationPolicyStore* store) {
const PolicyValueMap* mapping = PolicyValueMapping();
for (PolicyValueMap::const_iterator current = mapping->begin();
current != mapping->end(); ++current) {
std::wstring name = UTF8ToWide(current->name);
std::wstring string_value;
uint32 int_value;
bool bool_value;
switch (current->value_type) {
case Value::TYPE_STRING:
if (GetRegistryPolicyString(name.c_str(), &string_value)) {
store->Apply(
current->policy_type,
Value::CreateStringValue(string_value));
}
break;
case Value::TYPE_BOOLEAN:
if (GetRegistryPolicyBoolean(name.c_str(), &bool_value)) {
store->Apply(current->policy_type,
Value::CreateBooleanValue(bool_value));
}
break;
case Value::TYPE_INTEGER:
if (GetRegistryPolicyInteger(name.c_str(), &int_value)) {
store->Apply(current->policy_type,
Value::CreateIntegerValue(int_value));
}
break;
default:
NOTREACHED();
return false;
}
}
return true;
}
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