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// Copyright 2019 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/ash/components/dbus/usb/usbguard_client.h"
#include <map>
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "chromeos/ash/components/dbus/usb/fake_usbguard_client.h"
#include "chromeos/ash/components/dbus/usb/usbguard_observer.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/usbguard/dbus-constants.h"
namespace ash {
namespace {
UsbguardClient* g_instance = nullptr;
} // namespace
class UsbguardClientImpl : public UsbguardClient {
public:
UsbguardClientImpl() = default;
UsbguardClientImpl(const UsbguardClientImpl&) = delete;
UsbguardClientImpl& operator=(const UsbguardClientImpl&) = delete;
~UsbguardClientImpl() override = default;
// UsbguardClient:
void AddObserver(UsbguardObserver* observer) override {
observers_.AddObserver(observer);
}
// UsbguardClient:
void RemoveObserver(UsbguardObserver* observer) override {
observers_.RemoveObserver(observer);
}
// UsbguardClient:
bool HasObserver(const UsbguardObserver* observer) const override {
return observers_.HasObserver(observer);
}
void Init(dbus::Bus* bus) {
bus_ = bus;
usbguard_proxy_ = bus_->GetObjectProxy(
usbguard::kUsbguardServiceName,
dbus::ObjectPath(usbguard::kUsbguardDevicesInterfacePath));
usbguard_proxy_->ConnectToSignal(
usbguard::kUsbguardDevicesInterface,
usbguard::kDevicePolicyChangedSignalName,
base::BindRepeating(&UsbguardClientImpl::DevicePolicyChanged,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&UsbguardClientImpl::OnSignalConnected,
weak_ptr_factory_.GetWeakPtr()));
}
private:
// Dispatches the DevicePolicyChanged signal with signature: uuusua{ss}
void DevicePolicyChanged(dbus::Signal* signal) {
dbus::MessageReader signal_reader(signal);
dbus::MessageReader array_reader(nullptr);
uint32_t id;
uint32_t target_old;
uint32_t target_new;
std::string device_rule;
uint32_t rule_id;
if (!signal_reader.PopUint32(&id) ||
!signal_reader.PopUint32(&target_old) ||
!signal_reader.PopUint32(&target_new) ||
!signal_reader.PopString(&device_rule) ||
!signal_reader.PopUint32(&rule_id) ||
!signal_reader.PopArray(&array_reader)) {
LOG(ERROR) << "Error reading signal from usbguard: "
<< signal->ToString();
return;
}
std::map<std::string, std::string> attributes;
while (array_reader.HasMoreData()) {
dbus::MessageReader dict_entry(nullptr);
std::string key;
std::string value;
if (!array_reader.PopDictEntry(&dict_entry) ||
!dict_entry.PopString(&key) || !dict_entry.PopString(&value)) {
LOG(ERROR) << "Error reading array from signal from usbguard: "
<< signal->ToString();
return;
}
attributes[key] = value;
}
for (auto& observer : observers_) {
observer.DevicePolicyChanged(
id, static_cast<UsbguardObserver::Target>(target_old),
static_cast<UsbguardObserver::Target>(target_new), device_rule,
rule_id, attributes);
}
}
// Called when the biometrics signal is initially connected.
void OnSignalConnected(const std::string& interface_name,
const std::string& signal_name,
bool success) {
LOG_IF(ERROR, !success)
<< "Failed to connect to usbguard signal: " << signal_name;
}
raw_ptr<dbus::Bus> bus_ = nullptr;
raw_ptr<dbus::ObjectProxy> usbguard_proxy_ = nullptr;
base::ObserverList<UsbguardObserver> observers_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<UsbguardClientImpl> weak_ptr_factory_{this};
};
UsbguardClient::UsbguardClient() {
DCHECK(!g_instance);
g_instance = this;
}
UsbguardClient::~UsbguardClient() {
DCHECK_EQ(this, g_instance);
g_instance = nullptr;
}
// static
void UsbguardClient::Initialize(dbus::Bus* bus) {
DCHECK(bus);
(new UsbguardClientImpl())->Init(bus);
}
// static
void UsbguardClient::InitializeFake() {
new FakeUsbguardClient();
}
// static
void UsbguardClient::Shutdown() {
DCHECK(g_instance);
delete g_instance;
}
// static
UsbguardClient* UsbguardClient::Get() {
return g_instance;
}
} // namespace ash
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