过滤FastIO

过滤驱动就是挂载在一般驱动，比如磁盘驱动上，拦截IRP、FastIO请求，并有选择的过滤。

FastIO和IRP类似，一般比IRP要复杂，如果对FastIO全部拒绝，可以让驱动走IRP，这也是一般的过滤方法。

遍历FSD驱动派遣函数与Hook检测 - 知乎 (zhihu.com)

FSD(File System Drivers)位于系统底层，是和磁盘驱动最近的地方。它平时存在感不强，但由于本身身处要地，所以经常被各种恶意程序、安全软件以及其他怀有各种纯洁和不纯洁目的的应用盯上。

初始化FastIO派遣例程

在wdm中有对FAST_IO_DISPATCH的定义，申请一个这样的结构，并填充其中的内容

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int InitializeFastIo(
    FAST_IO_DISPATCH** FastIoDispatch)   //这是一个二维指针  
{

    //申请一个结构指针
    FAST_IO_DISPATCH* v5 = NULL;
    v5 = (PFAST_IO_DISPATCH)ExAllocatePool(NonPagedPool, sizeof(FAST_IO_DISPATCH));
    if (v5 == NULL)
        return -1;

    RtlZeroMemory(v5, sizeof(FAST_IO_DISPATCH));
    v5->SizeOfFastIoDispatch = sizeof(FAST_IO_DISPATCH);
    v5->FastIoCheckIfPossible = FastIoCheckIfPossible;
    v5->FastIoRead = FastIoRead;
    v5->FastIoWrite = FastIoWrite;
    v5->FastIoQueryBasicInfo = FastIoQueryBasicInfo;
    v5->FastIoQueryStandardInfo = FastIoQueryStandardInfo;
    v5->FastIoLock = FastIoLock;
    v5->FastIoUnlockSingle = FastIoUnlockSingle;
    v5->FastIoUnlockAll = FastIoUnlockAll;
    v5->FastIoUnlockAllByKey = FastIoUnlockAllByKey;
    v5->FastIoDeviceControl = FastIoDeviceControl;
    v5->FastIoDetachDevice = FastIoDetachDevice;
    v5->FastIoQueryNetworkOpenInfo = FastIoQueryNetworkOpenInfo;
    v5->MdlRead = FastIoMdlRead;
    v5->MdlReadComplete = FastIoMdlReadComplete;
    v5->PrepareMdlWrite = FastIoPrepareMdlWrite;
    v5->MdlWriteComplete = FastIoMdlWriteComplete;
    v5->FastIoReadCompressed = FastIoReadCompressed;
    v5->FastIoWriteCompressed = FastIoWriteCompressed;
    v5->MdlReadCompleteCompressed = FastIoMdlReadCompleteCompressed;
    v5->MdlWriteCompleteCompressed = FastIoMdlWriteCompleteCompressed;
    v5->FastIoQueryOpen = FastIoQueryOpen;

    *FastIoDispatch = v5;

    return 0;
}

FastIO派遣例程成员

首先判断设备对象是否是我们的设备对象，且不对控制设备对象处理。调用绑定的对应函数，这里自身直接返回FALSE。

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BOOLEAN FastIoCheckIfPossible(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    ULONG Length,
    BOOLEAN Wait,
    ULONG LockKey,
    BOOLEAN CheckForReadOperation,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    
   BOOLEAN IsOk = FALSE;
   PDEVICE_EXTENSION DeviceExtension = NULL;	
   PFAST_IO_DISPATCH FastIoDispatch = NULL;	  //指针数组的数组名
   PDEVICE_OBJECT    v2 = NULL;    //????????????????????????????????????????????


   //判断设备对象是否是我们的设备对象
   if (!IsOurDeviceObject(DeviceObject))
   {
       goto Exit;
   }
 
   //我们要获得钩子函数
   DeviceExtension = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;
   v2 = DeviceExtension->pFSDeviceObject;  //FSD设备对象

   if (IsControlDeviceObject(DeviceObject) == TRUE)
   {
       goto Exit;   //如果是控制设备对象
   }

   if(FastIoDispatch->FastIoCheckIfPossible == NULL)
   {
       goto Exit;
   }   
   if (v2 == NULL || v2->DriverObject == NULL)
   {
       goto Exit;
   }
   FastIoDispatch = v2->DriverObject->FastIoDispatch;
   if (FastIoDispatch == NULL)
   {
       goto Exit;
   }
   IsOk = FastIoDispatch->FastIoCheckIfPossible(
        FileObject,
        FileOffset,
        Length,
        Wait,
        LockKey,
        CheckForReadOperation,
        IoStatus,
        v2);

Exit:	
    return IsOk;   
    //如果返回false报废当前FastIo请求 执行Irp请求
}

可以抽出FastIO开始和结束部分

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#define BEGIN_FAST_IO	\
    PDEVICE_EXTENSION DeviceExtension = NULL;	\
    PDEVICE_OBJECT v2 = NULL;	\
    PFAST_IO_DISPATCH FastIoDispatch = NULL;	\
    BOOLEAN	IsOk = FALSE;	\
    \
    if (!IsOurDeviceObject(DeviceObject))	\
    goto Exit;	\
    \
    DeviceExtension = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;	\
    v2 = DeviceExtension->pFSDeviceObject;	\
    \
    if (IsControlDeviceObject(DeviceObject) == TRUE)	\
    goto Exit;	\
    \
    if (v2 == NULL || v2->DriverObject == NULL)	\
    goto Exit;	\
    \
    FastIoDispatch = v2->DriverObject->FastIoDispatch;	\
    if (FastIoDispatch == NULL)	\
    goto Exit;	\

#define END_FAST_IO	\
Exit:	\
    return IsOk;	\

给出余下的FastIO派遣例程

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BOOLEAN FastIoRead(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    ULONG Length,
    BOOLEAN Wait,
    ULONG LockKey,
    PVOID Buffer,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

    if (FastIoDispatch->FastIoRead == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoRead(
        FileObject,
        FileOffset,
        Length,
        Wait,
        LockKey,
        Buffer,
        IoStatus,
        v2);

    END_FAST_IO
}
BOOLEAN FastIoWrite(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    ULONG Length,
    BOOLEAN Wait,
    ULONG LockKey,
    PVOID Buffer,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoWrite == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoWrite(
        FileObject,
        FileOffset,
        Length,
        Wait,
        LockKey,
        Buffer,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoQueryBasicInfo(
    PFILE_OBJECT FileObject,
    BOOLEAN Wait,
    PFILE_BASIC_INFORMATION Buffer,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoQueryBasicInfo == NULL)
            goto Exit;


    IsOk = FastIoDispatch->FastIoQueryBasicInfo(
        FileObject,
        Wait,
        Buffer,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoQueryStandardInfo(
    PFILE_OBJECT FileObject,
    BOOLEAN Wait,
    PFILE_STANDARD_INFORMATION Buffer,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoQueryStandardInfo == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoQueryStandardInfo(
        FileObject,
        Wait,
        Buffer,
        IoStatus,
        v2);

    END_FAST_IO;
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoLock(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    PLARGE_INTEGER Length,
    PEPROCESS ProcessId,
    ULONG Key,
    BOOLEAN FailImmediately,
    BOOLEAN ExclusiveLock,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoLock == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoLock(
        FileObject,
        FileOffset,
        Length,
        ProcessId,
        Key,
        FailImmediately,
        ExclusiveLock,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoUnlockSingle(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    PLARGE_INTEGER Length,
    PEPROCESS ProcessId,
    ULONG Key,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoUnlockSingle == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoUnlockSingle(
        FileObject,
        FileOffset,
        Length,
        ProcessId,
        Key,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoUnlockAll(
    PFILE_OBJECT FileObject,
    PEPROCESS ProcessId,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoUnlockAll == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoUnlockAll(
        FileObject,
        ProcessId,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoUnlockAllByKey(
    PFILE_OBJECT FileObject,
    PVOID ProcessId,
    ULONG Key,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoUnlockAllByKey == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoUnlockAllByKey(
        FileObject,
        ProcessId,
        Key,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoDeviceControl(
    PFILE_OBJECT FileObject,
    BOOLEAN Wait,
    PVOID InputBuffer,
    ULONG InputBufferLength,
    PVOID OutputBuffer,
    ULONG OutputBufferLength,
    ULONG IoControlCode,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoDeviceControl == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoDeviceControl(
        FileObject,
        Wait,
        InputBuffer,
        InputBufferLength,
        OutputBuffer,
        OutputBufferLength,
        IoControlCode,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoQueryNetworkOpenInfo(
    PFILE_OBJECT FileObject,
    BOOLEAN Wait,
    PFILE_NETWORK_OPEN_INFORMATION Buffer,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoQueryNetworkOpenInfo == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoQueryNetworkOpenInfo(
        FileObject,
        Wait,
        Buffer,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoMdlRead(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    ULONG Length,
    ULONG LockKey,
    PMDL* MdlChain,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->MdlRead == NULL)
            goto Exit;

    IsOk = FastIoDispatch->MdlRead(
        FileObject,
        FileOffset,
        Length,
        LockKey,
        MdlChain,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoMdlReadComplete(
    PFILE_OBJECT FileObject,
    PMDL MdlChain,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->MdlReadComplete == NULL)
            goto Exit;

    IsOk = FastIoDispatch->MdlReadComplete(
        FileObject,
        MdlChain,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoPrepareMdlWrite(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    ULONG Length,
    ULONG LockKey,
    PMDL* MdlChain,
    PIO_STATUS_BLOCK IoStatus,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->PrepareMdlWrite == NULL)
            goto Exit;

    IsOk = FastIoDispatch->PrepareMdlWrite(
        FileObject,
        FileOffset,
        Length,
        LockKey,
        MdlChain,
        IoStatus,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoMdlWriteComplete(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    PMDL MdlChain,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->MdlWriteComplete == NULL)
            goto Exit;

    IsOk = FastIoDispatch->MdlWriteComplete(
        FileObject,
        FileOffset,
        MdlChain,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoReadCompressed(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    ULONG Length,
    ULONG LockKey,
    PVOID Buffer,
    PMDL* MdlChain,
    PIO_STATUS_BLOCK IoStatus,
    struct _COMPRESSED_DATA_INFO* CompressedDataInfo,
    ULONG CompressedDataInfoLength,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoReadCompressed == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoReadCompressed(
        FileObject,
        FileOffset,
        Length,
        LockKey,
        Buffer,
        MdlChain,
        IoStatus,
        CompressedDataInfo,
        CompressedDataInfoLength,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoWriteCompressed(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    ULONG Length,
    ULONG LockKey,
    PVOID Buffer,
    PMDL* MdlChain,
    PIO_STATUS_BLOCK IoStatus,
    struct _COMPRESSED_DATA_INFO* CompressedDataInfo,
    ULONG CompressedDataInfoLength,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoWriteCompressed == NULL)
            goto Exit;

    IsOk = FastIoDispatch->FastIoWriteCompressed(
        FileObject,
        FileOffset,
        Length,
        LockKey,
        Buffer,
        MdlChain,
        IoStatus,
        CompressedDataInfo,
        CompressedDataInfoLength,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoMdlReadCompleteCompressed(
    PFILE_OBJECT FileObject,
    PMDL MdlChain,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->MdlReadCompleteCompressed == NULL)
            goto Exit;

    IsOk = FastIoDispatch->MdlReadCompleteCompressed(
        FileObject,
        MdlChain,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoMdlWriteCompleteCompressed(
    PFILE_OBJECT FileObject,
    PLARGE_INTEGER FileOffset,
    PMDL MdlChain,
    PDEVICE_OBJECT DeviceObject)
{
    BEGIN_FAST_IO

        if (FastIoDispatch->MdlWriteCompleteCompressed == NULL)
            goto Exit;

    IsOk = FastIoDispatch->MdlWriteCompleteCompressed(
        FileObject,
        FileOffset,
        MdlChain,
        v2);

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

BOOLEAN FastIoQueryOpen(
    PIRP Irp,
    PFILE_NETWORK_OPEN_INFORMATION NetworkInformation,
    PDEVICE_OBJECT DeviceObject)
{
    PIO_STACK_LOCATION IoStackLocation = IoGetCurrentIrpStackLocation(Irp);

    BEGIN_FAST_IO

        if (FastIoDispatch->FastIoQueryOpen == NULL)
            goto Exit;

    IoStackLocation->DeviceObject = v2;
    IsOk = FastIoDispatch->FastIoQueryOpen(
        Irp,
        NetworkInformation,
        v2);
    IoStackLocation->DeviceObject = DeviceObject;

    END_FAST_IO
}

/////////////////////////////////////////////////////////////////////////////

VOID FastIoDetachDevice(
    PDEVICE_OBJECT SourceDevice,
    PDEVICE_OBJECT TargetDevice)
{
    IoDetachDevice(TargetDevice);
    IoDeleteDevice(SourceDevice);
}