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// Copyright 2016 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/security_key/security_key_ipc_client.h"
#include <memory>
#include <string>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/logging.h"
#include "base/task/single_thread_task_runner.h"
#include "build/build_config.h"
#include "remoting/base/logging.h"
#include "remoting/host/chromoting_host_services_client.h"
#include "remoting/host/security_key/security_key_ipc_constants.h"
#if BUILDFLAG(IS_WIN)
#include <Windows.h>
#endif
namespace remoting {
SecurityKeyIpcClient::SecurityKeyIpcClient()
: SecurityKeyIpcClient(std::make_unique<ChromotingHostServicesClient>()) {}
SecurityKeyIpcClient::SecurityKeyIpcClient(
std::unique_ptr<ChromotingHostServicesProvider> service_provider)
: service_provider_(std::move(service_provider)) {}
SecurityKeyIpcClient::~SecurityKeyIpcClient() {
DCHECK(thread_checker_.CalledOnValidThread());
}
bool SecurityKeyIpcClient::CheckForSecurityKeyIpcServerChannel() {
DCHECK(thread_checker_.CalledOnValidThread());
return service_provider_->GetSessionServices() != nullptr;
}
void SecurityKeyIpcClient::EstablishIpcConnection(
ConnectedCallback connected_callback,
base::OnceClosure connection_error_callback) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(connected_callback);
DCHECK(connection_error_callback);
DCHECK(!security_key_forwarder_.is_bound());
connected_callback_ = std::move(connected_callback);
connection_error_callback_ = std::move(connection_error_callback);
ConnectToIpcChannel();
}
bool SecurityKeyIpcClient::SendSecurityKeyRequest(
const std::string& request_payload,
ResponseCallback response_callback) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(!request_payload.empty());
DCHECK(response_callback);
if (!security_key_forwarder_.is_bound() ||
!security_key_forwarder_.is_connected()) {
LOG(ERROR) << "Request made before IPC connection was established.";
return false;
}
if (response_callback_) {
LOG(ERROR)
<< "Request made while waiting for a response to a previous request.";
return false;
}
response_callback_ = std::move(response_callback);
security_key_forwarder_->OnSecurityKeyRequest(
request_payload,
base::BindOnce(&SecurityKeyIpcClient::OnSecurityKeyResponse,
base::Unretained(this)));
return true;
}
void SecurityKeyIpcClient::CloseIpcConnection() {
DCHECK(thread_checker_.CalledOnValidThread());
HOST_LOG << "IPC connection closed.";
security_key_forwarder_.reset();
}
void SecurityKeyIpcClient::OnQueryVersionResult(uint32_t unused_version) {
DCHECK(thread_checker_.CalledOnValidThread());
HOST_LOG << "IPC channel connected.";
std::move(connected_callback_).Run();
}
void SecurityKeyIpcClient::OnChannelError() {
DCHECK(thread_checker_.CalledOnValidThread());
LOG(ERROR) << "IPC channel error.";
security_key_forwarder_.reset();
if (connection_error_callback_) {
std::move(connection_error_callback_).Run();
}
}
void SecurityKeyIpcClient::OnSecurityKeyResponse(
const std::string& response_data) {
DCHECK(thread_checker_.CalledOnValidThread());
if (!response_data.empty()) {
std::move(response_callback_).Run(response_data);
} else {
LOG(ERROR) << "Invalid response received";
if (connection_error_callback_) {
std::move(connection_error_callback_).Run();
}
}
}
void SecurityKeyIpcClient::ConnectToIpcChannel() {
DCHECK(thread_checker_.CalledOnValidThread());
// Verify that any existing IPC connection has been closed.
CloseIpcConnection();
if (!CheckForSecurityKeyIpcServerChannel()) {
LOG(ERROR) << "Invalid channel handle.";
OnChannelError();
return;
}
auto disconnect_handler = base::BindRepeating(
&SecurityKeyIpcClient::OnChannelError, base::Unretained(this));
// There is a bug in Mojo, such that if the host rejects binding of session
// services, there is a chance that binding of SecurityKeyForwarder appears to
// be successful and the disconnect handler of `remote_` is never called, so
// `remote_` will remain invalid forever.
// The disconnect handler of session services is still called, so we set a
// disconnect handler on it.
// See https://crbug.com/425759818#comment8 for more context.
service_provider_->set_disconnect_handler(disconnect_handler);
service_provider_->GetSessionServices()->BindSecurityKeyForwarder(
security_key_forwarder_.BindNewPipeAndPassReceiver());
security_key_forwarder_.set_disconnect_handler(disconnect_handler);
// This is to determine if the peer binding is successful. If the connection
// is disconnected before OnQueryVersionResult() is called, it means the
// server has rejected the binding request.
security_key_forwarder_.QueryVersion(base::BindOnce(
&SecurityKeyIpcClient::OnQueryVersionResult, base::Unretained(this)));
}
} // namespace remoting
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