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// Copyright 2019 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/signed_dispatcher.h"
#include <stdint.h>
#include <string>
#include "base/strings/string_util.h"
#include "base/win/scoped_handle.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_params.h"
#include "sandbox/win/src/sandbox.h"
#include "sandbox/win/src/signed_interception.h"
#include "sandbox/win/src/signed_policy.h"
namespace sandbox {
SignedDispatcher::SignedDispatcher(PolicyBase* policy_base)
: policy_base_(policy_base) {
static const IPCCall create_params = {
{IpcTag::NTCREATESECTION, {VOIDPTR_TYPE}},
reinterpret_cast<CallbackGeneric>(&SignedDispatcher::CreateSection)};
ipc_calls_.push_back(create_params);
}
bool SignedDispatcher::SetupService(InterceptionManager* manager,
IpcTag service) {
if (service == IpcTag::NTCREATESECTION)
return INTERCEPT_NT(manager, NtCreateSection, CREATE_SECTION_ID, 32);
return false;
}
bool SignedDispatcher::CreateSection(IPCInfo* ipc, HANDLE file_handle) {
// Duplicate input handle from target to broker.
HANDLE local_file_handle = nullptr;
if (!::DuplicateHandle((*ipc->client_info).process, file_handle,
::GetCurrentProcess(), &local_file_handle,
FILE_MAP_EXECUTE, false, 0)) {
return false;
}
base::win::ScopedHandle local_handle(local_file_handle);
std::wstring path;
if (!GetPathFromHandle(local_handle.Get(), &path))
return false;
const wchar_t* module_name = path.c_str();
CountedParameterSet<NameBased> params;
params[NameBased::NAME] = ParamPickerMake(module_name);
EvalResult result =
policy_base_->EvalPolicy(IpcTag::NTCREATESECTION, params.GetBase());
// Return operation status on the IPC.
HANDLE section_handle = nullptr;
ipc->return_info.nt_status = SignedPolicy::CreateSectionAction(
result, *ipc->client_info, local_handle, §ion_handle);
ipc->return_info.handle = section_handle;
return true;
}
} // namespace sandbox
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