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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/elevation_util.h"
#include <objbase.h>
#include <windows.h>
#include <shlobj.h>
#include <wrl/client.h>
#include <string>
#include "base/base_paths.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/process/launch.h"
#include "base/process/process.h"
#include "base/process/process_handle.h"
#include "base/process/process_info.h"
#include "base/win/access_token.h"
#include "base/win/scoped_bstr.h"
#include "base/win/scoped_process_information.h"
#include "base/win/scoped_variant.h"
#include "base/win/startup_information.h"
#include "third_party/abseil-cpp/absl/cleanup/cleanup.h"
namespace base::win {
ProcessId GetExplorerPid() {
const HWND hwnd = ::GetShellWindow();
ProcessId pid = 0;
return hwnd && ::GetWindowThreadProcessId(hwnd, &pid) ? pid : kNullProcessId;
}
bool IsProcessRunningAtMediumOrLower(ProcessId process_id) {
IntegrityLevel level = GetProcessIntegrityLevel(process_id);
return level != INTEGRITY_UNKNOWN && level <= MEDIUM_INTEGRITY;
}
// Based on
// https://learn.microsoft.com/en-us/archive/blogs/aaron_margosis/faq-how-do-i-start-a-program-as-the-desktop-user-from-an-elevated-app.
Process RunDeElevated(const CommandLine& command_line) {
if (!::IsUserAnAdmin()) {
return LaunchProcess(command_line, {});
}
ProcessId explorer_pid = GetExplorerPid();
if (!explorer_pid || !IsProcessRunningAtMediumOrLower(explorer_pid)) {
return Process();
}
auto shell_process =
Process::OpenWithAccess(explorer_pid, PROCESS_QUERY_LIMITED_INFORMATION);
if (!shell_process.IsValid()) {
return Process();
}
auto token = AccessToken::FromProcess(
::GetCurrentProcess(), /*impersonation=*/false, MAXIMUM_ALLOWED);
if (!token) {
return Process();
}
auto previous_impersonate = token->SetPrivilege(SE_IMPERSONATE_NAME, true);
if (!previous_impersonate) {
return Process();
}
absl::Cleanup restore_previous_privileges = [&] {
token->SetPrivilege(SE_IMPERSONATE_NAME, *previous_impersonate);
};
auto shell_token = AccessToken::FromProcess(
shell_process.Handle(), /*impersonation=*/false, TOKEN_DUPLICATE);
if (!shell_token) {
return Process();
}
auto duplicated_shell_token = shell_token->DuplicatePrimary(
TOKEN_QUERY | TOKEN_ASSIGN_PRIMARY | TOKEN_DUPLICATE |
TOKEN_ADJUST_DEFAULT | TOKEN_ADJUST_SESSIONID);
if (!duplicated_shell_token) {
return Process();
}
StartupInformation startupinfo;
PROCESS_INFORMATION pi = {};
if (!::CreateProcessWithTokenW(duplicated_shell_token->get(), 0,
command_line.GetProgram().value().c_str(),
command_line.GetCommandLineString().data(), 0,
nullptr, nullptr, startupinfo.startup_info(),
&pi)) {
return Process();
}
ScopedProcessInformation process_info(pi);
Process process(process_info.TakeProcessHandle());
const DWORD pid = process.Pid();
VLOG(1) << __func__ << ": Started process, PID: " << pid;
// Allow the spawned process to show windows in the foreground.
if (!::AllowSetForegroundWindow(pid)) {
VPLOG(1) << __func__ << ": ::AllowSetForegroundWindow failed";
}
return process;
}
HRESULT RunDeElevatedNoWait(const CommandLine& command_line) {
return RunDeElevatedNoWait(command_line.GetProgram().value(),
command_line.GetArgumentsString());
}
HRESULT RunDeElevatedNoWait(const std::wstring& path,
const std::wstring& parameters,
std::optional<std::wstring_view> current_directory,
bool start_hidden) {
Microsoft::WRL::ComPtr<IShellWindows> shell;
HRESULT hr = ::CoCreateInstance(CLSID_ShellWindows, nullptr,
CLSCTX_LOCAL_SERVER, IID_PPV_ARGS(&shell));
if (FAILED(hr)) {
return hr;
}
LONG hwnd = 0;
Microsoft::WRL::ComPtr<IDispatch> dispatch;
hr = shell->FindWindowSW(ScopedVariant(CSIDL_DESKTOP).AsInput(),
ScopedVariant().AsInput(), SWC_DESKTOP, &hwnd,
SWFO_NEEDDISPATCH, &dispatch);
if (hr == S_FALSE || FAILED(hr)) {
return hr == S_FALSE ? E_FAIL : hr;
}
Microsoft::WRL::ComPtr<IServiceProvider> service;
hr = dispatch.As(&service);
if (FAILED(hr)) {
return hr;
}
Microsoft::WRL::ComPtr<IShellBrowser> browser;
hr = service->QueryService(SID_STopLevelBrowser, IID_PPV_ARGS(&browser));
if (FAILED(hr)) {
return hr;
}
Microsoft::WRL::ComPtr<IShellView> view;
hr = browser->QueryActiveShellView(&view);
if (FAILED(hr)) {
return hr;
}
hr = view->GetItemObject(SVGIO_BACKGROUND, IID_PPV_ARGS(&dispatch));
if (FAILED(hr)) {
return hr;
}
Microsoft::WRL::ComPtr<IShellFolderViewDual> folder;
hr = dispatch.As(&folder);
if (FAILED(hr)) {
return hr;
}
hr = folder->get_Application(&dispatch);
if (FAILED(hr)) {
return hr;
}
Microsoft::WRL::ComPtr<IShellDispatch2> shell_dispatch;
hr = dispatch.As(&shell_dispatch);
if (FAILED(hr)) {
return hr;
}
std::optional<base::FilePath> current_dir;
if (!current_directory) {
current_dir = base::PathService::CheckedGet(base::DIR_CURRENT);
current_directory = current_dir->value();
}
return shell_dispatch->ShellExecute(
ScopedBstr(path.c_str()).Get(), ScopedVariant(parameters.c_str()),
ScopedVariant(current_directory->data()),
/*vOperation=*/ScopedVariant::kEmptyVariant,
ScopedVariant(start_hidden ? SW_HIDE : SW_SHOWDEFAULT));
}
} // namespace base::win
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