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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/policy/configuration_policy_provider_delegate_win.h"
#include "base/string_number_conversions.h"
#include "base/utf_string_conversions.h"
#include "base/win/registry.h"
#include "policy/policy_constants.h"
using base::win::RegKey;
namespace {
bool ReadRegistryStringValue(RegKey* key, const string16& name,
string16* result) {
DWORD value_size = 0;
DWORD key_type = 0;
scoped_array<uint8> buffer;
if (key->ReadValue(name.c_str(), 0, &value_size, &key_type) != ERROR_SUCCESS)
return false;
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 pre-fill to zeros to guarantee
// the 0-termination.
buffer.reset(new uint8[value_size + 2]);
memset(buffer.get(), 0, value_size + 2);
key->ReadValue(name.c_str(), buffer.get(), &value_size, NULL);
result->assign(reinterpret_cast<const wchar_t*>(buffer.get()));
return true;
}
} // namespace
namespace policy {
ConfigurationPolicyProviderDelegateWin::ConfigurationPolicyProviderDelegateWin(
const ConfigurationPolicyProvider::PolicyDefinitionList*
policy_definition_list)
: policy_definition_list_(policy_definition_list) {
}
DictionaryValue* ConfigurationPolicyProviderDelegateWin::Load() {
DictionaryValue* result = new DictionaryValue();
const ConfigurationPolicyProvider::PolicyDefinitionList::Entry* current;
for (current = policy_definition_list_->begin;
current != policy_definition_list_->end;
++current) {
const string16 name(ASCIIToUTF16(current->name));
switch (current->value_type) {
case Value::TYPE_STRING: {
string16 string_value;
if (GetRegistryPolicyString(name, &string_value)) {
result->SetString(current->name, string_value);
}
break;
}
case Value::TYPE_LIST: {
scoped_ptr<ListValue> list_value(new ListValue);
if (GetRegistryPolicyStringList(name, list_value.get()))
result->Set(current->name, list_value.release());
break;
}
case Value::TYPE_BOOLEAN: {
bool bool_value;
if (GetRegistryPolicyBoolean(name, &bool_value)) {
result->SetBoolean(current->name, bool_value);
}
break;
}
case Value::TYPE_INTEGER: {
uint32 int_value;
if (GetRegistryPolicyInteger(name, &int_value)) {
result->SetInteger(current->name, int_value);
}
break;
}
default:
NOTREACHED();
}
}
return result;
}
bool ConfigurationPolicyProviderDelegateWin::GetRegistryPolicyString(
const string16& name, string16* result) const {
RegKey policy_key(HKEY_LOCAL_MACHINE, kRegistrySubKey, KEY_READ);
// First try the global policy.
if (ReadRegistryStringValue(&policy_key, name, result))
return true;
// Fall back on user-specific policy.
if (policy_key.Open(HKEY_CURRENT_USER, kRegistrySubKey,
KEY_READ) != ERROR_SUCCESS)
return false;
return ReadRegistryStringValue(&policy_key, name, result);
}
bool ConfigurationPolicyProviderDelegateWin::GetRegistryPolicyStringList(
const string16& key, ListValue* result) const {
string16 path = string16(kRegistrySubKey);
path += ASCIIToUTF16("\\") + key;
RegKey policy_key;
if (policy_key.Open(HKEY_LOCAL_MACHINE, path.c_str(), KEY_READ) !=
ERROR_SUCCESS) {
// Fall back on user-specific policy.
if (policy_key.Open(HKEY_CURRENT_USER, path.c_str(), KEY_READ) !=
ERROR_SUCCESS)
return false;
}
string16 policy_string;
int index = 0;
while (ReadRegistryStringValue(&policy_key, base::IntToString16(++index),
&policy_string)) {
result->Append(Value::CreateStringValue(policy_string));
}
return true;
}
bool ConfigurationPolicyProviderDelegateWin::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;
}
bool ConfigurationPolicyProviderDelegateWin::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;
}
} // namespace policy
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