x64内核中强删文件的实现

一丶简介

说道删除文件.有各种各样的方法. 有ring3 也有ring0. 而且也有许多对抗的方法. 如ring3想删除一个文件.被占用你就无法删除.此时可以通过解除句柄进行删除 ring0中想删除一个文件.有常规方法也有非常规方法.常规方法就是设置文件属性为删除.然后进行设置. 还有就是直接调用ZwDeleteFile 进行删除. 暴力删除就是这里所讲的 IRP删除.给底层发送IRP即可进行删除文件.

1.步骤

步骤很简单.基本上说完就可以自己写代码做出

1.打开文件.获取文件句柄 (IoCreateFile)
2.根据文件句柄,获取文件对象.(有了句柄都应该第一时间想到获取它的对象) (ObReferenceObjectByHandle)
3.获取文件对象的设备对象指针.这个发送IRP的时候需要使用(IoGetRelatedDeviceObject)
4.申请IRP(IoAllocateIrp)
5.初始化你申请的IRP
6.获取IRP的下层堆栈,并且初始化信息.(IoGetNextIrpStackLocation)
7.设置回调.系统完成IRP之后会调用你这个回调.所以你需要设置事件同步跟你自己同步,才知道IRP已经发送完了.(IoSetCompletionRoutine)
8.获取文件对象的域指针.并且设置域指针的两个成员为0.系统以他来判断这个程序是否可以删除.如果不为0.那么则无法删除运行中的文件.

pSectionObjectPointer->ImageSectionObject = 0;
pSectionObjectPointer->DataSectionObject = 0;

9.发送IRP(IoCallDriver)
10.根据事件来等待是否IRP完成(KeWaitForSingleObject)
11.做完收工.(ZwClose)

2.Nt驱动代码


#include "Driver.h"


//删除文件函数的入口
NTSTATUS RetOpenFileHandle(UNICODE_STRING uDelFileName, PHANDLE pFileHandle)
{
    
    NTSTATUS ntStatus = STATUS_UNSUCCESSFUL;
    IO_STATUS_BLOCK iostu;
    HANDLE hFileHandle = 0;
    if (pFileHandle == NULL)
        return STATUS_UNSUCCESSFUL;
    if (KeGetCurrentIrql() > PASSIVE_LEVEL)
        return 0;

    if (uDelFileName.Length < 0 || uDelFileName.MaximumLength < 0)
    {
        return 0;
    }


    OBJECT_ATTRIBUTES ObjAttribute;
    ObjAttribute.ObjectName = &uDelFileName;
    ObjAttribute.SecurityDescriptor = NULL;
    ObjAttribute.SecurityQualityOfService = NULL;
    ObjAttribute.Attributes = OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE;
    ObjAttribute.Length = sizeof(OBJECT_ATTRIBUTES);

  /*  InitializeObjectAttributes(
        &ObjAttribute,
        &uDelFileName, 
        OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE, 
        NULL, NULL);*/

    ntStatus = IoCreateFile(&hFileHandle,
        FILE_READ_ATTRIBUTES,
        &ObjAttribute, 
        &iostu,
        0, 
        FILE_ATTRIBUTE_NORMAL,
        FILE_SHARE_DELETE, 
        FILE_OPEN,
        0, 
        NULL, 
        0, 
        CreateFileTypeNone,
        NULL,
        IO_NO_PARAMETER_CHECKING);

    *pFileHandle = hFileHandle;
    return ntStatus;
}

//去掉文件属性


//CallBack回调
NTSTATUS
CallBackIrpCompleteionProc(
    PDEVICE_OBJECT DeviceObject,
    PIRP Irp,
     PVOID Context
)
{

    //操作系统会设置这个回调
    Irp->UserIosb->Status = Irp->IoStatus.Status;
    Irp->UserIosb->Information = Irp->IoStatus.Information;
    KeSetEvent(Irp->UserEvent, IO_NO_INCREMENT, FALSE);

    IoFreeIrp(Irp);
    return STATUS_MORE_PROCESSING_REQUIRED;
}
NTSTATUS PassFileattribute(PFILE_OBJECT pFileObj)
{
    /*
    1.申请IRP,初始化IRP
    2.初始化同步事件,以及设置回调.
    3.设置文件属性为默认
    4.发送IRP
    */
    PDEVICE_OBJECT pNextDeviceObj = NULL;
    PIRP pAllocIrp = NULL;
    KEVENT IrpSynEvent = {0}; //Irp同步需要的事件同步
    FILE_BASIC_INFORMATION fileBasciInfo = { 0 };
    IO_STATUS_BLOCK iostu;
    PIO_STACK_LOCATION IrpStack;
    //通过文件对象.获取其设备对象指针
    pNextDeviceObj = IoGetRelatedDeviceObject(pFileObj);  
    if (pNextDeviceObj == NULL)
        return STATUS_UNSUCCESSFUL;

    //通过设备对象指针.确定申请的IRP的大小,注意在完成设置里面进行释放.
    pAllocIrp = IoAllocateIrp(pNextDeviceObj->StackSize,TRUE);
    if (pAllocIrp == NULL)
        return STATUS_UNSUCCESSFUL;

    //初始化Irp

    //设置为自动,设置为无信号.
    KeInitializeEvent(&IrpSynEvent, SynchronizationEvent, FALSE); 

    fileBasciInfo.FileAttributes = FILE_ATTRIBUTE_NORMAL;
    pAllocIrp->AssociatedIrp.SystemBuffer = &fileBasciInfo;
    pAllocIrp->UserIosb = &iostu;
    pAllocIrp->UserEvent = &IrpSynEvent;
    pAllocIrp->Tail.Overlay.OriginalFileObject = pFileObj;
    pAllocIrp->Tail.Overlay.Thread = (PETHREAD)KeGetCurrentThread();

    //获取下层堆栈.进行设置.

    //IrpStack  = 
    IrpStack = IoGetNextIrpStackLocation(pAllocIrp);
    IrpStack->MajorFunction = IRP_MJ_SET_INFORMATION; 
    IrpStack->DeviceObject = pNextDeviceObj;
    IrpStack->FileObject = pFileObj;
    IrpStack->Parameters.SetFile.Length = sizeof(FILE_BASIC_INFORMATION);
    IrpStack->Parameters.SetFile.FileObject = pFileObj;
    IrpStack->Parameters.SetFile.FileInformationClass = FileBasicInformation;

    //设置完成例程
    IoSetCompletionRoutine(pAllocIrp, CallBackIrpCompleteionProc, &IrpSynEvent, TRUE, TRUE, TRUE);
 

    //发送IRP
    IoCallDriver(pNextDeviceObj, pAllocIrp);
    //等待完成.

    KeWaitForSingleObject(&IrpSynEvent, Executive, KernelMode, TRUE, NULL);

    return STATUS_SUCCESS;
}

NTSTATUS FsDeleteFile(PFILE_OBJECT pFileObj)
{
    /*
  1.申请IRP,初始化IRP
  2.初始化同步事件,以及设置回调.
  3.设置文件属性为默认
  4.发送IRP

  核心:
    核心是设置 FileObject中的域.进而删除正在运行中的文件

  */
    PDEVICE_OBJECT pNextDeviceObj = NULL;
    PIRP pAllocIrp = NULL;
    KEVENT IrpSynEvent = { 0 }; //Irp同步需要的事件同步
    FILE_DISPOSITION_INFORMATION     fileBasciInfo = { 0 };  //注意此位置.已经变化为 FILE_DISPOSITION_INFORMATION
    IO_STATUS_BLOCK iostu;
    PIO_STACK_LOCATION IrpStack;

    PSECTION_OBJECT_POINTERS pFileExe;  //注意此属性要设置为0.欺骗系统进行删除
    //通过文件对象.获取其设备对象指针
    pNextDeviceObj = IoGetRelatedDeviceObject(pFileObj);
    if (pNextDeviceObj == NULL)
        return STATUS_UNSUCCESSFUL;

    //通过设备对象指针.确定申请的IRP的大小,注意在完成设置里面进行释放.
    pAllocIrp = IoAllocateIrp(pNextDeviceObj->StackSize, TRUE);
    if (pAllocIrp == NULL)
        return STATUS_UNSUCCESSFUL;

    //初始化Irp

    //设置为自动,设置为无信号.
    KeInitializeEvent(&IrpSynEvent, SynchronizationEvent, FALSE);

    fileBasciInfo.DeleteFile = TRUE;        //设置标记为删除
    pAllocIrp->AssociatedIrp.SystemBuffer = &fileBasciInfo;
    pAllocIrp->UserIosb = &iostu;
    pAllocIrp->UserEvent = &IrpSynEvent;
    pAllocIrp->Tail.Overlay.OriginalFileObject = pFileObj;
    pAllocIrp->Tail.Overlay.Thread = (PETHREAD)KeGetCurrentThread();

    //获取下层堆栈.进行设置.

    //IrpStack  = 
    IrpStack = IoGetNextIrpStackLocation(pAllocIrp);
    IrpStack->MajorFunction = IRP_MJ_SET_INFORMATION;
    IrpStack->DeviceObject = pNextDeviceObj;
    IrpStack->FileObject = pFileObj;
    IrpStack->Parameters.SetFile.Length = sizeof(FILE_DISPOSITION_INFORMATION);
    IrpStack->Parameters.SetFile.FileObject = pFileObj;
    IrpStack->Parameters.SetFile.FileInformationClass = FileDispositionInformation;

    //设置完成例程
    IoSetCompletionRoutine(pAllocIrp, CallBackIrpCompleteionProc, &IrpSynEvent, TRUE, TRUE, TRUE);

    //删除正在运行中的文件.
    
    pFileExe = pFileObj->SectionObjectPointer;
    pFileExe->DataSectionObject = 0;
    pFileExe->ImageSectionObject = 0;
    //发送IRP
    IoCallDriver(pNextDeviceObj, pAllocIrp);
    //等待完成.

    KeWaitForSingleObject(&IrpSynEvent, Executive, KernelMode, TRUE, NULL);

    return STATUS_SUCCESS;
}
NTSTATUS IrpDeleteFileRun(UNICODE_STRING uDelFileName)
{
    KdBreakPoint();
    NTSTATUS ntStatus = STATUS_UNSUCCESSFUL;
    /*
    1.首先通过发送IRP去掉文件的属性
    2.设置文件属性为删除.进行发送IRP强删文件.
    */
    HANDLE hFileHandle = { 0 };
    PFILE_OBJECT  pFileObject = NULL;
    //sep1 : OpenFile Get File Handle
    ntStatus = RetOpenFileHandle(uDelFileName,&hFileHandle);

    if (!NT_SUCCESS(ntStatus))
    {
        goto ExitAnRelease;
    }
    //sep2:  Chang File Handle to FileObject

    ntStatus = ObReferenceObjectByHandle(
        hFileHandle,
        GENERIC_ALL,
        *IoFileObjectType,
        KernelMode,
        &pFileObject,
        NULL);
    if (!NT_SUCCESS(ntStatus))
    {
       
        goto ExitAnRelease;
    }

    //setp 3:  Pass File Atribute
    KdBreakPoint();
   ntStatus =  PassFileattribute(pFileObject);
   if (!NT_SUCCESS(ntStatus))
   {
       goto ExitAnRelease;
   }

   //setp 4: Send Irp DeleteFile
   KdBreakPoint();
   ntStatus = FsDeleteFile(pFileObject);
   if (!NT_SUCCESS(ntStatus))
   {
       goto ExitAnRelease;
   }
ExitAnRelease:

    if (pFileObject != NULL)
        ObDereferenceObject(pFileObject);
    if (hFileHandle != NULL)
        ZwClose(hFileHandle);
  
    return ntStatus;
}
NTSTATUS DriverEntry(PDRIVER_OBJECT pDriverObj, PUNICODE_STRING pRegPath)
{
	ULONG iCount = 0;
	NTSTATUS ntStatus;
    UNICODE_STRING uDelFileName = { 0 };
	pDriverObj->DriverUnload = DriverUnLoad;
	/*ntStatus = InitDeviceAnSybolicLinkName(pDriverObj);
	if (!NT_SUCCESS(ntStatus))
	{
		return ntStatus;
	}

	ntStatus = InitDisPatchFunction(pDriverObj);
	if (!NT_SUCCESS(ntStatus))
	{
		return ntStatus;
	}*/

    //也可写成: \??\c:\xxx.txt

    RtlInitUnicodeString(&uDelFileName, L"//DosDevices//C://123.txt");
    IrpDeleteFileRun(uDelFileName);
	return STATUS_SUCCESS;
}

代码测试可以进行强删.