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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/chromoting_host_services_client.h"
#include "base/environment.h"
#include "base/functional/bind.h"
#include "base/sequence_checker.h"
#include "build/build_config.h"
#include "components/named_mojo_ipc_server/named_mojo_ipc_server_client_util.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/system/invitation.h"
#include "remoting/base/constants.h"
#include "remoting/host/ipc_constants.h"
#include "remoting/host/mojom/chromoting_host_services.mojom.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#include "base/win/sid.h"
#include "remoting/host/win/acl_util.h"
#endif
namespace remoting {
namespace {
bool g_initialized = false;
mojo::PendingRemote<mojom::ChromotingHostServices> ConnectToServer(
const mojo::NamedPlatformChannel::ServerName& server_name) {
auto endpoint = named_mojo_ipc_server::ConnectToServer(server_name);
if (!endpoint.is_valid()) {
LOG(WARNING) << "Cannot connect to IPC through server name " << server_name
<< ". Endpoint is invalid.";
return {};
}
#if BUILDFLAG(IS_WIN)
DWORD peer_session_id;
if (!GetNamedPipeServerSessionId(endpoint.platform_handle().GetHandle().get(),
&peer_session_id)) {
PLOG(ERROR) << "GetNamedPipeServerSessionId failed";
return {};
}
// '0' (default) corresponds to the session the network process runs in.
if (peer_session_id != 0) {
LOG(ERROR)
<< "Cannot establish connection with IPC server running in session: "
<< peer_session_id;
return {};
}
#endif
auto invitation = mojo::IncomingInvitation::Accept(std::move(endpoint));
auto message_pipe =
invitation.ExtractMessagePipe(kChromotingHostServicesMessagePipeId);
return mojo::PendingRemote<mojom::ChromotingHostServices>(
std::move(message_pipe), /* version= */ 0);
}
} // namespace
ChromotingHostServicesClient::ChromotingHostServicesClient()
: ChromotingHostServicesClient(GetChromotingHostServicesServerName()) {}
ChromotingHostServicesClient::ChromotingHostServicesClient(
const mojo::NamedPlatformChannel::ServerName& server_name)
: ChromotingHostServicesClient(
base::Environment::Create(),
base::BindRepeating(&ConnectToServer, server_name)) {
DCHECK(g_initialized)
<< "ChromotingHostServicesClient::Initialize() has not been called.";
}
ChromotingHostServicesClient::ChromotingHostServicesClient(
std::unique_ptr<base::Environment> environment,
ConnectToServerCallback connect_to_server)
: environment_(std::move(environment)),
connect_to_server_(std::move(connect_to_server)) {}
ChromotingHostServicesClient::~ChromotingHostServicesClient() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
// static
bool ChromotingHostServicesClient::Initialize() {
DCHECK(!g_initialized);
#if BUILDFLAG(IS_WIN)
// The network process running under the LocalService account verifies the
// session ID of the client process, which normally isn't allowed since the
// network process has reduced trust level, so we add an ACL to allow it.
g_initialized = AddProcessAccessRightForWellKnownSid(
base::win::WellKnownSid::kLocalService,
PROCESS_QUERY_LIMITED_INFORMATION);
#else
// Other platforms don't need initialization.
g_initialized = true;
#endif
return g_initialized;
}
mojom::ChromotingSessionServices*
ChromotingHostServicesClient::GetSessionServices() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!const_cast<ChromotingHostServicesClient*>(this)
->EnsureSessionServicesBinding()) {
return nullptr;
}
return session_services_remote_.get();
}
void ChromotingHostServicesClient::set_disconnect_handler(
base::OnceClosure disconnect_handler) {
disconnect_handler_ = std::move(disconnect_handler);
}
bool ChromotingHostServicesClient::EnsureConnection() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (remote_.is_bound()) {
return true;
}
auto pending_remote = connect_to_server_.Run();
if (!pending_remote.is_valid()) {
LOG(WARNING) << "Invalid message pipe.";
return false;
}
remote_.Bind(std::move(pending_remote));
remote_.set_disconnect_handler(base::BindOnce(
&ChromotingHostServicesClient::OnDisconnected, base::Unretained(this)));
return true;
}
bool ChromotingHostServicesClient::EnsureSessionServicesBinding() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (session_services_remote_.is_bound()) {
return true;
}
#if BUILDFLAG(IS_LINUX)
if (!environment_->HasVar(kChromeRemoteDesktopSessionEnvVar)) {
LOG(WARNING) << "Current desktop environment is not remotable.";
return false;
}
#endif
if (!EnsureConnection()) {
return false;
}
remote_->BindSessionServices(
session_services_remote_.BindNewPipeAndPassReceiver());
session_services_remote_.set_disconnect_handler(
base::BindOnce(&ChromotingHostServicesClient::OnSessionDisconnected,
base::Unretained(this)));
return true;
}
void ChromotingHostServicesClient::OnDisconnected() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
remote_.reset();
if (disconnect_handler_) {
std::move(disconnect_handler_).Run();
}
}
void ChromotingHostServicesClient::OnSessionDisconnected() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
session_services_remote_.reset();
if (disconnect_handler_) {
std::move(disconnect_handler_).Run();
}
}
} // namespace remoting
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