试用网上成品的禁用U盘的相关软件,发现使用固态硬盘改装的U盘以及手机等设备,无法被禁止,无奈下,自己使用C#手搓了一个。
基本逻辑:
- 开机自启;
- 启动时,修改注册表,禁止系统插入USB存储设备
- 监听系统的USB插入事件
- 判断系统插入USB设备的类型;
- 如果系统注册表被篡改,并插入非法设备,则立刻重启系统;
Demo1.0主要代码如下:
csharp
using Microsoft.Win32;
using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Management;
using System.Security.AccessControl;
using System.Security.Principal;
using System.ServiceProcess;
namespace ListeningUSB
{
partial class Service1 : ServiceBase
{
private string logFilePath;
private ManagementEventWatcher watcher;
public Service1()
{
InitializeComponent();
logFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "secrecy.log");
}
protected override void OnStart(string[] args)
{
// 重构注册表
// 3:表示手动启动,通常用于设备驱动,即启用 USB 功能;
// 4:表示禁用启动,此设置会禁用 USB 存储设备,插入 U 盘等设备时将无法使用;
// 0:表示自动启动。
string[] services = { "USBSTOR", "cdrom", "UASPStor", "WUDFWpdMtp", "WINUSB", "usbprint", "usbscan", "aicusbwifi", "RtlWlanu", "BTHUSB" };
foreach (string item in services)
{
string keyPath = $"SYSTEM\\CurrentControlSet\\Services\\{item}";
int startValue = GetRegistryValue(keyPath);
if (startValue != 4)
{
SetUSBStorPermissions(keyPath, 4);
}
}
StartListeningForUSBInsertion();
}
protected override void OnStop()
{
if (watcher != null)
{
watcher.Stop();
watcher.Dispose();
}
}
private void StartListeningForUSBInsertion()
{
// 检查日志文件是否存在
CheckAndCreateFile(logFilePath);
string query = "SELECT * FROM __InstanceCreationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_USBControllerDevice'";
watcher = new ManagementEventWatcher(new WqlEventQuery(query));
watcher.EventArrived += new EventArrivedEventHandler(USBInserted);
watcher.Start();
WriteLog("-------------开始异常设备检测---------------");
}
private void USBInserted(object sender, EventArrivedEventArgs e)
{
if (JudgeUSBStatus(out string deviceInfo))
{
WriteLog($"检测到异常 USB 设备插入,设备信息: {deviceInfo}");
using (Process process = new Process())
{
process.StartInfo = startInfo;
process.Start();
}
}
}
// 检查日志文件是否存在
static void CheckAndCreateFile(string filePath)
{
if (!File.Exists(filePath))
{
using (File.Create(filePath)) { }
}
}
// 关机
ProcessStartInfo startInfo = new ProcessStartInfo
{
FileName = "shutdown.exe",
Arguments = "/s /f /t 0",
UseShellExecute = false
};
private bool JudgeUSBStatus(out string deviceInfo)
{
deviceInfo = string.Empty;
var serviceList = new[] { "disk", "wudfwpdmtp", "usbstor", "cdrom", "uaspstor", "usbprint", "rtlwlanu", "aicusbwifi", "usbscan" };
bool status = false;
try
{
using (var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE PNPDeviceID LIKE 'USB%'"))
{
var usbDevices = searcher.Get();
foreach (ManagementObject usbDevice in usbDevices)
{
var service = usbDevice["Service"]?.ToString().ToLower();
if (service != null && serviceList.Contains(service))
{
status = true;
deviceInfo = usbDevice.ToString();
break;
}
}
}
}
catch (Exception ex)
{
WriteLog($"Error: {ex.Message}");
}
return status;
}
private void WriteLog(string message)
{
using (StreamWriter writer = new StreamWriter(logFilePath, true))
{
writer.WriteLine($"{DateTime.Now:yyyy-MM-dd HH:mm:ss}: {message}");
}
}
static int GetRegistryValue(string keyPath)
{
try
{
using (RegistryKey key = Registry.LocalMachine.OpenSubKey(keyPath))
{
if (key != null)
{
object value = key.GetValue("Start");
if (value is int)
{
return (int)value;
}
}
}
}
catch (Exception e)
{
Console.WriteLine($"Error getting registry value: {e.Message}");
}
return -1;
}
static void SetUSBStorPermissions(string keyPath, int value)
{
try
{
using (RegistryKey key = Registry.LocalMachine.OpenSubKey(keyPath, RegistryKeyPermissionCheck.ReadWriteSubTree))
{
if (key != null)
{
// 获取当前注册表项的 ACL 信息
RegistrySecurity securityDescriptor = key.GetAccessControl();
RegistryAccessRule everyoneRule = new RegistryAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null),
RegistryRights.FullControl,
AccessControlType.Allow);
securityDescriptor.AddAccessRule(everyoneRule);
key.SetAccessControl(securityDescriptor);
// 修改 USBSTOR 注册表项的 Start 值为 4
key.SetValue("Start", value, RegistryValueKind.DWord);
// 将 USBSTOR 注册表项权限设置为所有人仅可读
securityDescriptor = key.GetAccessControl();
securityDescriptor.RemoveAccessRuleSpecific(everyoneRule);
key.SetAccessControl(securityDescriptor);
}
}
}
catch (Exception e)
{
Console.WriteLine($"Error setting registry permissions: {e.Message}");
}
}
}
}
打包后,软件约12KB,使用下面的CMD命令,将exe加入系统的开机自启即可;
bash
# 加入开机自启服务
sc create secrecy binPath= "C:\Windows\System32\secrecy.exe" displayname="secrecy" description="This is a service that monitors whether the system has inserted an abnormal USB device."
# 删除该服务
sc delete secrecy