最近做了UKey加密中设计到USB设备. 因UKEy是用来加密和执行PC与项目间通信加密的介质.从作用范围来讲不是传统意义上U盘作为存储介质来使用.其实熟悉网银驱动DR应该了解.在网银系统安全上一个最基本需求就是动态即时监控通信PC驱动以及设备列表通信变化.当然包括我们加密存储介质在PC上USB插拔.
思路一.在WinFrom中通过拦截Windows 消息机制来实现. 类似定义MEssageForm窗体. 假如用鼠标左击一下窗体, 系统会收到一条 WM_LBUTTONDOWN 消息;当鼠标抬起, 系统又会收到 WM_LBUTTONUP 消息.系统收到消息后, 会告诉窗体发生的事情, 然后窗体再做出反应; 当然窗体能否做出反应要看窗体是否有相应的响应代码. 同样也可以把USB设备插拔事件通过重写窗体WndProc(Ref Message m)方法拦截并处理.
首先引入命名空间:
1: using System.Management;
2: using System.Threading;
3: using System.Security.Permissions;
定义Device Management Event的枚举:
1: public enum DeviceEvent : int
2: {
3: DBT_CONFIGCHANGECANCELED = 0x0019,
4: DBT_CONFIGCHANGED=0x0018,
5: DBT_CUSTOMEVENT=0x8006,
6: DBT_DEVICEARRIVAL=0x8000,//USB Insert DEvice Statu
7: DBT_DEVICEQUERYREMOVE=0x8001,
8: DBT_DEVICEQUERYREMOVEFAILED=0x8002,
9: DBT_DEVICEREMOVEPENDING=0x8003,//USB Revoing.
10: DBT_DEVICEREMOVECOMPLETE=0x8004,//USB Remove Completed
11: DBT_DEVICETYPESPECIFIC=0x8005,
12: DBT_DEVNODES_CHANGED=0x0007,//Device List _Changed
13: DBT_QUERYCHANGECONFIG=0x0017,
14: DBT_USERDEFINED=0xFFFF
15: }
其中涉及到USB设备插拔的是DEVICEREMOVEPENDING/DEVICEREMOVECOMPLETE[删除] DEVICEARRIVAL[插入设备] 重写WinFProc实现窗体上对Windows MEssage进行拦截并重新处理:
1: [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
2: protected override void WndProc(ref Message m)
3: {
4: base.WndProc(ref m);
5: DeviceEvent lEvent;
6:
7: lEvent = (DeviceEvent)m.WParam.ToInt32();
8: switch (lEvent)
9: {
10: case DeviceEvent.DBT_DEVICEARRIVAL://[Insert]
11: this.CheckDeviceStatus_Lable.BackColor = Color.Green;
12: this.CheckDeviceStatus_Lable.Text = "----Connection Device!----";
13: MessageBox.Show("Just Insert At Moment !", "Insert");
14: break;
15: case DeviceEvent.DBT_DEVICEREMOVECOMPLETE://[REmove]
16: this.CheckDeviceStatus_Lable.BackColor = Color.Red;
17: this.CheckDeviceStatus_Lable.Text = "------No Connection------";
18: MessageBox.Show("Remove Complete At Moment!", "Remove");
19: break;
20: case DeviceEvent.DBT_DEVNODES_CHANGED://[Device List Have Changed]
21: MessageBox.Show("Device List have been Changed!");
22: break;
23: default:
24: break;
25: }
26: }
首先USB在进行插拔即时如果没有存储介质即Disk或是无驱动的方式可能不能触发DeviceEvent.DBT_DEVICEREMOVECOMPLETE 和 DeviceEvent.DBT_DEVICEARRIVAL插把事件. 但是一点是可以确认的是.PC端只要接受USB设备.PC识别之后设备列表肯定会发生变化. 如果不是加密Key. u盘的 盘符方式存在Disk存储介质.则没有问题.
当然需要移植这种基于From窗体系统Message拦截方法时发现这种可重用性就不高.换一种思路采用Windows底层方式WMI实现.
WMI以CIMOM为基础，CIMOM即公共信息模型对象管理器[Common Information Model Object Manager]，是一个描述操作系统构成单元的对象数据库，为MMC和脚本程序提供了一个访问操作系统构成单元的公共接口。有了WMI，工具软件和脚本程序访问操作系统的不同部分时不需要使用不同的API；相反，操作系统的不同部分都可以插入WMI，工具软件和WMI可以方便地读写WMI.
WMI 可以产生的系统级事件的一些更有用。 每当创建 WMI 类的新实例 ； 例如对于激发称为 __instancecreationevent 事件__instancedeletionevent 时将触发一个实例将被删除. 当然USB插拔时同样获得这个系统事件：
1: public void ControlUSBConnectionStatu()
2: {
3: ManagementEventWatcher getEventWatcher = null;
4: WqlEventQuery getEventQuery = null;
5:
6: ManagementOperationObserver getObserver = new ManagementOperationObserver();
7:
8: //Bind to Loacl Machine and Watch the PortConnection
9: ManagementScope getScope = new ManagementScope("root\\CIMV2");
10: getScope.Options.EnablePrivileges = true;//set requeired
11:
12: try
13: {
14: getEventQuery = new WqlEventQuery();
15: getEventQuery.EventClassName = "__InstanceOperationEvent";
16: getEventQuery.WithinInterval = new TimeSpan(0, 0, 0, 1);
17: getEventQuery.Condition = @"TargetInstance ISA 'Win32_DiskDrive' ";
//[Disk must have DiskDrive fuck ]
20: //Event Watcher [Test Event and semd informatio to this message and create new informtion .]
21: getEventWatcher = new ManagementEventWatcher(getEventQuery);
22: getEventWatcher.EventArrived += new EventArrivedEventHandler(getEventWatcher_EventArrived);
23: getEventWatcher.Start();//Start Watch Event
25: }
26: catch (Exception se)
27: { }
28: finally
29: {
30: // getEventWatcher.Stop();
31: }
32: }
当发生USB插拔并成功监听到事件时处理方法:
1: void getEventWatcher_EventArrived(object sender, EventArrivedEventArgs e)
2: {
3: ManagementBaseObject getBaseObject = (ManagementBaseObject)e.NewEvent;
4: if ((getBaseObject.ClassPath.ClassName == "__InstanceCreationEvent"))
5: {
6: //Usb Inserted
7: MessageBox.Show("USB Disk Inserted!");
8: }
9: else
10: {
11: //Usb Removed
12: MessageBox.Show("USB Device Removed!");
13: }
14: }
如上在定义时设置一个Condition[条件]:存在Disk Driver 磁盘驱动.如果类似某些UKey不存在磁盘驱动同时也无存储介质 经过测试你会发现.加密的UKey插入 如上的WMI监听事件并不能扑捉到USB插拔. 但是针对这种方式我们还有一种更为彻底的方式就是USB插拔唯一可以确定在PC识别必然变化的因素是系统设备列表发生更新.
WMI处理监听:
1: /// <summary>
2: /// 监听USB Device设备插拔事件 完整操作.
3: /// WMI Handle Event Change Device List chenkai
4: /// </summary>
5: public void RegisterDeviceWMIEventStatu()
6: {
7: try
8: {
9: //Device List HAve Changed And Send Message
10: WqlEventQuery query = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent");
11: ManagementEventWatcher watcher = new ManagementEventWatcher(query);
12: watcher.EventArrived += new EventArrivedEventHandler(watcher_EventArrived);
13: watcher.Start(); // Start listening for events
14: }
15: catch (Exception se)
16: { }
17: }
WMI监听处理函数:
1: void watcher_EventArrived(object sender, EventArrivedEventArgs e)
2: {
3: string geteventtype = e.NewEvent.GetPropertyValue("EventType").ToString();
4: ManagementBaseObject getEventObject = (ManagementBaseObject)e.NewEvent;
5:
6: if (getEventObject != null)
7: {
8: //close Operator
9: this.CloseDeviceEqument();
10: }
11: }
其实这依然还是一种折中办法.因为导致PC端设备列表发生变化的因素有很多.如何判定是USB口发生设备变化.WMI依然没有让我们失望:
1: //WMI Control The USB Device Change Statu And Send Message to When IT‘s Changed/
2: public void ControlUSBDeviceSTatu()
3: {
4: try
5: {
6: WqlEventQuery query = new WqlEventQuery("select * from Win32_VolumeChangeEvent");
7: ManagementEventWatcher getwatcher = new ManagementEventWatcher(query);
8: getwatcher.EventArrived += new EventArrivedEventHandler(getwatcher_EventArrived);
9: getwatcher.Start();
10: }
11: catch (Exception se)
12: { }
13: }
WMI在USB事情处理函数:
2: void getwatcher_EventArrived(object sender, EventArrivedEventArgs e)
3: {
4: MessageBox.Show(e.NewEvent.GetText(TextFormat.Mof).ToString());
5: }
这样来一来就可以清晰判定USB在插拔时所发生在系统PC端的变化通知给应用程序来进行处理.如何获得当前PC端 USB Driver列表.经过几番测试找到一种很好的方式获取全部的USB Driver信息:
1: //Get ALL USB DRiver And Driver Property Fuck this shit。chenkai
2: public static string[] AllInformation()
3: {
4: StringCollection propNames = new StringCollection();
5: ManagementClass driveClass = new ManagementClass("Win32_USBController");
6: PropertyDataCollection props = driveClass.Properties;
7: foreach (PropertyData driveProperty in props)
8: propNames.Add(driveProperty.Name);
12: int idx = 0;
13: ManagementObjectCollection drives = driveClass.GetInstances();
14: string _s = string.Empty;
15: List<string> harddisk = new List<string>();
16:
17: foreach (ManagementObject drv in drives)
18: {
19: idx++;
20: _s = string.Format(" USB Driver({0}) Properties ", idx);
21: harddisk.Add(_s);
22: foreach (string strProp in propNames)
23: {
24: _s = string.Format("Property: {0}, Value: {1}", strProp, drv[strProp]);
25: harddisk.Add(_s);
26: }
27: }
28: string[] _ss = harddisk.ToArray();
29: return _ss;
30: }
WMI的更多体现是对Windows 交互中进一步封装和管理.
Can考资料: