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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.
#include "sandbox/win/src/registry_dispatcher.h"
#include <stdint.h>
#include "base/win/scoped_handle.h"
#include "base/win/windows_version.h"
#include "sandbox/win/src/crosscall_client.h"
#include "sandbox/win/src/interception.h"
#include "sandbox/win/src/interceptors.h"
#include "sandbox/win/src/ipc_tags.h"
#include "sandbox/win/src/policy_broker.h"
#include "sandbox/win/src/policy_params.h"
#include "sandbox/win/src/registry_interception.h"
#include "sandbox/win/src/registry_policy.h"
#include "sandbox/win/src/sandbox.h"
#include "sandbox/win/src/sandbox_nt_util.h"
namespace {
// Builds a path using the root directory and the name.
bool GetCompletePath(HANDLE root,
const std::wstring& name,
std::wstring* complete_name) {
if (root) {
if (!sandbox::GetPathFromHandle(root, complete_name))
return false;
*complete_name += L"\\";
*complete_name += name;
} else {
*complete_name = name;
}
return true;
}
} // namespace
namespace sandbox {
RegistryDispatcher::RegistryDispatcher(PolicyBase* policy_base)
: policy_base_(policy_base) {
static const IPCCall create_params = {
{IpcTag::NTCREATEKEY,
{WCHAR_TYPE, UINT32_TYPE, VOIDPTR_TYPE, UINT32_TYPE, UINT32_TYPE,
UINT32_TYPE}},
reinterpret_cast<CallbackGeneric>(&RegistryDispatcher::NtCreateKey)};
static const IPCCall open_params = {
{IpcTag::NTOPENKEY, {WCHAR_TYPE, UINT32_TYPE, VOIDPTR_TYPE, UINT32_TYPE}},
reinterpret_cast<CallbackGeneric>(&RegistryDispatcher::NtOpenKey)};
ipc_calls_.push_back(create_params);
ipc_calls_.push_back(open_params);
}
bool RegistryDispatcher::SetupService(InterceptionManager* manager,
IpcTag service) {
if (IpcTag::NTCREATEKEY == service)
return INTERCEPT_NT(manager, NtCreateKey, CREATE_KEY_ID, 32);
if (IpcTag::NTOPENKEY == service) {
bool result = INTERCEPT_NT(manager, NtOpenKey, OPEN_KEY_ID, 16);
result &= INTERCEPT_NT(manager, NtOpenKeyEx, OPEN_KEY_EX_ID, 20);
return result;
}
return false;
}
bool RegistryDispatcher::NtCreateKey(IPCInfo* ipc,
std::wstring* name,
uint32_t attributes,
HANDLE root,
uint32_t desired_access,
uint32_t title_index,
uint32_t create_options) {
base::win::ScopedHandle root_handle;
std::wstring real_path = *name;
// If there is a root directory, we need to duplicate the handle to make
// it valid in this process.
if (root) {
if (!::DuplicateHandle(ipc->client_info->process, root,
::GetCurrentProcess(), &root, 0, false,
DUPLICATE_SAME_ACCESS))
return false;
root_handle.Set(root);
}
if (!GetCompletePath(root, *name, &real_path))
return false;
const wchar_t* regname = real_path.c_str();
CountedParameterSet<OpenKey> params;
params[OpenKey::NAME] = ParamPickerMake(regname);
params[OpenKey::ACCESS] = ParamPickerMake(desired_access);
EvalResult result =
policy_base_->EvalPolicy(IpcTag::NTCREATEKEY, params.GetBase());
HANDLE handle;
NTSTATUS nt_status;
ULONG disposition = 0;
if (!RegistryPolicy::CreateKeyAction(
result, *ipc->client_info, *name, attributes, root, desired_access,
title_index, create_options, &handle, &nt_status, &disposition)) {
ipc->return_info.nt_status = STATUS_ACCESS_DENIED;
return true;
}
// Return operation status on the IPC.
ipc->return_info.extended[0].unsigned_int = disposition;
ipc->return_info.nt_status = nt_status;
ipc->return_info.handle = handle;
return true;
}
bool RegistryDispatcher::NtOpenKey(IPCInfo* ipc,
std::wstring* name,
uint32_t attributes,
HANDLE root,
uint32_t desired_access) {
base::win::ScopedHandle root_handle;
std::wstring real_path = *name;
// If there is a root directory, we need to duplicate the handle to make
// it valid in this process.
if (root) {
if (!::DuplicateHandle(ipc->client_info->process, root,
::GetCurrentProcess(), &root, 0, false,
DUPLICATE_SAME_ACCESS))
return false;
root_handle.Set(root);
}
if (!GetCompletePath(root, *name, &real_path))
return false;
const wchar_t* regname = real_path.c_str();
CountedParameterSet<OpenKey> params;
params[OpenKey::NAME] = ParamPickerMake(regname);
params[OpenKey::ACCESS] = ParamPickerMake(desired_access);
EvalResult result =
policy_base_->EvalPolicy(IpcTag::NTOPENKEY, params.GetBase());
HANDLE handle;
NTSTATUS nt_status;
if (!RegistryPolicy::OpenKeyAction(result, *ipc->client_info, *name,
attributes, root, desired_access, &handle,
&nt_status)) {
ipc->return_info.nt_status = STATUS_ACCESS_DENIED;
return true;
}
// Return operation status on the IPC.
ipc->return_info.nt_status = nt_status;
ipc->return_info.handle = handle;
return true;
}
} // namespace sandbox
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