// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/dbus/permission_broker/permission_broker_client.h"
#include <stdint.h>
#include <utility>
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "chromeos/dbus/permission_broker/fake_permission_broker_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
using permission_broker::kCheckPathAccess;
using permission_broker::kClaimDevicePath;
using permission_broker::kDetachInterface;
using permission_broker::kOpenPath;
using permission_broker::kOpenPathAndRegisterClient;
using permission_broker::kPermissionBrokerInterface;
using permission_broker::kPermissionBrokerServiceName;
using permission_broker::kPermissionBrokerServicePath;
using permission_broker::kReattachInterface;
using permission_broker::kReleaseTcpPort;
using permission_broker::kReleaseTcpPortForward;
using permission_broker::kReleaseUdpPort;
using permission_broker::kReleaseUdpPortForward;
using permission_broker::kRequestTcpPortAccess;
using permission_broker::kRequestTcpPortForward;
using permission_broker::kRequestUdpPortAccess;
using permission_broker::kRequestUdpPortForward;
namespace chromeos {
namespace {
const char kNoResponseError[] = "org.chromium.Error.NoResponse";
PermissionBrokerClient* g_instance = nullptr;
} // namespace
class PermissionBrokerClientImpl : public PermissionBrokerClient {
public:
PermissionBrokerClientImpl() = default;
PermissionBrokerClientImpl(const PermissionBrokerClientImpl&) = delete;
PermissionBrokerClientImpl& operator=(const PermissionBrokerClientImpl&) =
delete;
~PermissionBrokerClientImpl() override = default;
void CheckPathAccess(const std::string& path,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kCheckPathAccess);
dbus::MessageWriter writer(&method_call);
writer.AppendString(path);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void OpenPath(const std::string& path,
OpenPathCallback callback,
ErrorCallback error_callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kOpenPath);
dbus::MessageWriter writer(&method_call);
writer.AppendString(path);
proxy_->CallMethodWithErrorCallback(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnOpenPathResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)),
base::BindOnce(&PermissionBrokerClientImpl::OnError,
weak_ptr_factory_.GetWeakPtr(),
std::move(error_callback)));
}
void ClaimDevicePath(const std::string& path,
uint32_t allowed_interfaces_mask,
int lifeline_fd,
OpenPathCallback callback,
ErrorCallback error_callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kClaimDevicePath);
dbus::MessageWriter writer(&method_call);
writer.AppendString(path);
writer.AppendUint32(allowed_interfaces_mask);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethodWithErrorCallback(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnOpenPathResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)),
base::BindOnce(&PermissionBrokerClientImpl::OnError,
weak_ptr_factory_.GetWeakPtr(),
std::move(error_callback)));
}
void OpenPathAndRegisterClient(const std::string& path,
uint32_t allowed_interfaces_mask,
int lifeline_fd,
OpenPathAndRegisterClientCallback callback,
ErrorCallback error_callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kOpenPathAndRegisterClient);
dbus::MessageWriter writer(&method_call);
writer.AppendString(path);
writer.AppendUint32(allowed_interfaces_mask);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethodWithErrorCallback(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(
&PermissionBrokerClientImpl::OpenPathAndRegisterClientResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)),
base::BindOnce(&PermissionBrokerClientImpl::OnError,
weak_ptr_factory_.GetWeakPtr(),
std::move(error_callback)));
}
void DetachInterface(const std::string& client_id,
uint8_t iface_num,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kDetachInterface);
dbus::MessageWriter writer(&method_call);
writer.AppendString(client_id);
writer.AppendByte(iface_num);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void ReattachInterface(const std::string& client_id,
uint8_t iface_num,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kReattachInterface);
dbus::MessageWriter writer(&method_call);
writer.AppendString(client_id);
writer.AppendByte(iface_num);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void RequestTcpPortAccess(uint16_t port,
const std::string& interface,
int lifeline_fd,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kRequestTcpPortAccess);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void RequestUdpPortAccess(uint16_t port,
const std::string& interface,
int lifeline_fd,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kRequestUdpPortAccess);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void ReleaseTcpPort(uint16_t port,
const std::string& interface,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kReleaseTcpPort);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void ReleaseUdpPort(uint16_t port,
const std::string& interface,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kReleaseUdpPort);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void RequestTcpPortForward(uint16_t in_port,
const std::string& in_interface,
const std::string& dst_ip,
uint16_t dst_port,
int lifeline_fd,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kRequestTcpPortForward);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(in_port);
writer.AppendString(in_interface);
writer.AppendString(dst_ip);
writer.AppendUint16(dst_port);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void RequestUdpPortForward(uint16_t in_port,
const std::string& in_interface,
const std::string& dst_ip,
uint16_t dst_port,
int lifeline_fd,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kRequestUdpPortForward);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(in_port);
writer.AppendString(in_interface);
writer.AppendString(dst_ip);
writer.AppendUint16(dst_port);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void ReleaseTcpPortForward(uint16_t in_port,
const std::string& in_interface,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kReleaseTcpPortForward);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(in_port);
writer.AppendString(in_interface);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void ReleaseUdpPortForward(uint16_t in_port,
const std::string& in_interface,
ResultCallback callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kReleaseUdpPortForward);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(in_port);
writer.AppendString(in_interface);
proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void Init(dbus::Bus* bus) {
proxy_ =
bus->GetObjectProxy(kPermissionBrokerServiceName,
dbus::ObjectPath(kPermissionBrokerServicePath));
}
private:
// Handle a DBus response from the permission broker, invoking the callback
// that the method was originally called with with the success response.
void OnResponse(ResultCallback callback, dbus::Response* response) {
if (!response) {
LOG(WARNING) << "Access request method call failed.";
std::move(callback).Run(false);
return;
}
bool result = false;
dbus::MessageReader reader(response);
if (!reader.PopBool(&result))
LOG(WARNING) << "Could not parse response: " << response->ToString();
std::move(callback).Run(result);
}
void OnOpenPathResponse(OpenPathCallback callback, dbus::Response* response) {
base::ScopedFD fd;
dbus::MessageReader reader(response);
if (!reader.PopFileDescriptor(&fd))
LOG(WARNING) << "Could not parse response: " << response->ToString();
std::move(callback).Run(std::move(fd));
}
void OpenPathAndRegisterClientResponse(
OpenPathAndRegisterClientCallback callback,
dbus::Response* response) {
base::ScopedFD fd;
std::string client_id;
dbus::MessageReader reader(response);
if (!reader.PopFileDescriptor(&fd)) {
LOG(WARNING) << "Could not parse response for fd: "
<< response->ToString();
}
if (!reader.PopString(&client_id)) {
LOG(WARNING) << "Could not parse response for client_id: "
<< response->ToString();
}
std::move(callback).Run(client_id, std::move(fd));
}
void OnError(ErrorCallback callback, dbus::ErrorResponse* response) {
std::string error_name;
std::string error_message;
if (response) {
dbus::MessageReader reader(response);
error_name = response->GetErrorName();
reader.PopString(&error_message);
} else {
error_name = kNoResponseError;
}
std::move(callback).Run(error_name, error_message);
}
raw_ptr<dbus::ObjectProxy> proxy_ = nullptr;
// Note: This should remain the last member so that it will be destroyed
// first, invalidating its weak pointers, before the other members are
// destroyed.
base::WeakPtrFactory<PermissionBrokerClientImpl> weak_ptr_factory_{this};
};
PermissionBrokerClient::PermissionBrokerClient() {
DCHECK(!g_instance);
g_instance = this;
}
PermissionBrokerClient::~PermissionBrokerClient() {
DCHECK_EQ(this, g_instance);
g_instance = nullptr;
}
// static
void PermissionBrokerClient::Initialize(dbus::Bus* bus) {
DCHECK(bus);
(new PermissionBrokerClientImpl())->Init(bus);
}
// static
void PermissionBrokerClient::InitializeFake() {
new FakePermissionBrokerClient();
}
// static
void PermissionBrokerClient::Shutdown() {
DCHECK(g_instance);
delete g_instance;
}
// static
PermissionBrokerClient* PermissionBrokerClient::Get() {
return g_instance;
}
} // namespace chromeos
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