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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/remote_open_url/url_forwarder_configurator_win.h"
#include <windows.h>
#include <wtsapi32.h>
#include <memory>
#include <string>
#include "base/base_paths.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/notreached.h"
#include "base/path_service.h"
#include "base/process/launch.h"
#include "base/sequence_checker.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/time/time.h"
#include "base/win/scoped_handle.h"
#include "base/win/windows_types.h"
#include "remoting/base/logging.h"
#include "remoting/host/base/switches.h"
#include "remoting/host/win/wts_session_change_observer.h"
namespace remoting {
namespace {
// If the user has already changed the default browser to the URL forwarder,
// then the setup process will finish immediately without showing any UI, so we
// delay reporting USER_INTERVENTION_REQUIRED so that the client doesn't pop up
// a toast when it's unnecessary.
constexpr base::TimeDelta kReportUserInterventionRequiredDelay =
base::Milliseconds(500);
base::win::ScopedHandle GetCurrentUserToken() {
HANDLE user_token = nullptr;
if (!WTSQueryUserToken(WTS_CURRENT_SESSION, &user_token)) {
PLOG(ERROR) << "Failed to get current user token";
return base::win::ScopedHandle();
}
return base::win::ScopedHandle(user_token);
}
// If |switch_name| is empty, the process will be launched with no extra
// switches.
bool LaunchConfiguratorProcess(const std::string& switch_name,
base::win::ScopedHandle user_token) {
DCHECK(user_token.IsValid());
base::LaunchOptions launch_options;
launch_options.as_user = user_token.Get();
// The remoting_desktop.exe binary (where this code runs) has extra manifest
// flags (uiAccess and requireAdministrator) that are undesirable for the
// url_forwarder_configurator child process, so remoting_host.exe is used
// instead.
base::FilePath path;
if (!base::PathService::Get(base::DIR_EXE, &path)) {
LOG(ERROR) << "Failed to get executable path.";
return false;
}
path = path.AppendASCII("remoting_host.exe");
base::CommandLine command(path);
command.AppendSwitchASCII(kProcessTypeSwitchName,
kProcessTypeUrlForwarderConfigurator);
if (!switch_name.empty()) {
command.AppendSwitch(switch_name);
}
int exit_code = -1;
base::LaunchProcess(command, launch_options).WaitForExit(&exit_code);
return exit_code == 0;
}
} // namespace
UrlForwarderConfiguratorWin::UrlForwarderConfiguratorWin()
: io_task_runner_(base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::WithBaseSyncPrimitives()})) {}
UrlForwarderConfiguratorWin::~UrlForwarderConfiguratorWin() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void UrlForwarderConfiguratorWin::IsUrlForwarderSetUp(
IsUrlForwarderSetUpCallback callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto user_token = GetCurrentUserToken();
if (user_token.IsValid()) {
io_task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(&LaunchConfiguratorProcess, std::string(),
std::move(user_token)),
std::move(callback));
return;
}
if (GetLastError() != ERROR_NO_TOKEN) {
std::move(callback).Run(false);
return;
}
if (is_url_forwarder_set_up_callback_) {
LOG(ERROR) << "Query is already in progress.";
std::move(callback).Run(false);
return;
}
DCHECK(!wts_session_change_observer_);
HOST_LOG << "Can't determine URL Forwarder state as no user is signed in. "
<< "Will check again after user signs in.";
is_url_forwarder_set_up_callback_ = std::move(callback);
wts_session_change_observer_ = std::make_unique<WtsSessionChangeObserver>();
bool start_success = wts_session_change_observer_->Start(
base::BindRepeating(&UrlForwarderConfiguratorWin::OnWtsSessionChange,
base::Unretained(this)));
if (!start_success) {
std::move(is_url_forwarder_set_up_callback_).Run(false);
}
}
void UrlForwarderConfiguratorWin::SetUpUrlForwarder(
const SetUpUrlForwarderCallback& callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (set_up_url_forwarder_callback_) {
LOG(ERROR) << "Setup is already in progress.";
callback.Run(SetUpUrlForwarderResponse::FAILED);
return;
}
set_up_url_forwarder_callback_ = callback;
report_user_intervention_required_timer_.Start(
FROM_HERE, kReportUserInterventionRequiredDelay, this,
&UrlForwarderConfiguratorWin::OnReportUserInterventionRequired);
auto user_token = GetCurrentUserToken();
if (!user_token.IsValid()) {
OnSetUpResponse(false);
return;
}
io_task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(&LaunchConfiguratorProcess, kSetUpUrlForwarderSwitchName,
std::move(user_token)),
base::BindOnce(&UrlForwarderConfiguratorWin::OnSetUpResponse,
weak_factory_.GetWeakPtr()));
}
void UrlForwarderConfiguratorWin::OnSetUpResponse(bool success) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
report_user_intervention_required_timer_.Stop();
set_up_url_forwarder_callback_.Run(success
? SetUpUrlForwarderResponse::COMPLETE
: SetUpUrlForwarderResponse::FAILED);
set_up_url_forwarder_callback_.Reset();
}
void UrlForwarderConfiguratorWin::OnReportUserInterventionRequired() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
set_up_url_forwarder_callback_.Run(
SetUpUrlForwarderResponse::USER_INTERVENTION_REQUIRED);
}
void UrlForwarderConfiguratorWin::OnWtsSessionChange(uint32_t event,
uint32_t session_id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (event != WTS_SESSION_LOGON) {
return;
}
DCHECK(is_url_forwarder_set_up_callback_);
HOST_LOG << "User logged in. Checking URL forwarder setup state now.";
auto user_token = GetCurrentUserToken();
if (!user_token.IsValid()) {
std::move(is_url_forwarder_set_up_callback_).Run(false);
return;
}
io_task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(&LaunchConfiguratorProcess, std::string(),
std::move(user_token)),
std::move(is_url_forwarder_set_up_callback_));
wts_session_change_observer_.reset();
}
// static
std::unique_ptr<UrlForwarderConfigurator> UrlForwarderConfigurator::Create() {
return std::make_unique<UrlForwarderConfiguratorWin>();
}
} // namespace remoting
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