mirror of
https://github.com/vxunderground/MalwareSourceCode.git
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307 lines
8.6 KiB
C
307 lines
8.6 KiB
C
#include "FileSystem.h"
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/*创建文件对象，相当于自己实现了IoCreateFile FileObject中的IrpList循环指向自身*/
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NTSTATUS
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IrpCreateFile(
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IN PUNICODE_STRING FilePath,
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IN ACCESS_MASK DesiredAccess,
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IN ULONG FileAttributes,
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IN ULONG ShareAccess,
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IN ULONG CreateDisposition,
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IN ULONG CreateOptions,
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IN PDEVICE_OBJECT DeviceObject,
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IN PDEVICE_OBJECT RealDevice,
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OUT PFILE_OBJECT *FileObject
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)
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{
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NTSTATUS ntStatus;
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HANDLE hFile;
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PFILE_OBJECT _FileObject;
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UNICODE_STRING UniDeviceNameString;
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OBJECT_ATTRIBUTES ObjectAttributes;
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IO_STATUS_BLOCK IoStatusBlock;
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WCHAR *FileNameBuffer=NULL;
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WORD FileObjectSize;
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PIRP Irp;
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KEVENT kEvent;
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PIO_STACK_LOCATION IrpSp;
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ACCESS_STATE AccessState;
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AUX_ACCESS_DATA AuxData;
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IO_SECURITY_CONTEXT SecurityContext;
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PLIST_ENTRY IrpList;
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InitializeObjectAttributes(&ObjectAttributes, NULL, OBJ_CASE_INSENSITIVE, 0, NULL);
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//in win7 x86
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FileObjectSize=0x80;
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//创建文件对象
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ntStatus = ObCreateObject(KernelMode,
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*IoFileObjectType,
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&ObjectAttributes,
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KernelMode,
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NULL,
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FileObjectSize,
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0,
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0,
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&_FileObject);
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if(!NT_SUCCESS(ntStatus))
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{
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return ntStatus;
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}
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Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE); //在Irp堆栈上申请内存空间 大小为之前查询的DeviceObject->Size
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if(Irp == NULL)
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{
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ObDereferenceObject(_FileObject);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);
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RtlZeroMemory(_FileObject, FileObjectSize);
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_FileObject->Type = IO_TYPE_FILE; //文件对象类型
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_FileObject->Size = FileObjectSize; //文件对象大小
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_FileObject->DeviceObject = RealDevice; //查询到的卷设备
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_FileObject->Flags = FO_SYNCHRONOUS_IO;
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FileNameBuffer=ExAllocatePool(NonPagedPool,FilePath->MaximumLength);
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if (FileNameBuffer==NULL)
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{
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ObDereferenceObject(_FileObject);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlCopyMemory(FileNameBuffer,FilePath->Buffer,FilePath->Length);//文件对象中的文件路径
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_FileObject->FileName.Buffer=FileNameBuffer; //
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_FileObject->FileName.Length=FilePath->Length;
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_FileObject->FileName.MaximumLength=FilePath->MaximumLength;
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IrpList=(PLIST_ENTRY)((DWORD)FileObject+0x74); //IrpList 循环指向自身
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IrpList->Flink=IrpList;
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IrpList->Blink=IrpList;
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KeInitializeEvent(&_FileObject->Lock, SynchronizationEvent, FALSE);
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KeInitializeEvent(&_FileObject->Event, NotificationEvent, FALSE);
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RtlZeroMemory(&AuxData, sizeof(AUX_ACCESS_DATA));
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ntStatus = SeCreateAccessState( &AccessState, //访问权限
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&AuxData,
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DesiredAccess,
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IoGetFileObjectGenericMapping());
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if (!NT_SUCCESS(ntStatus))
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{
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IoFreeIrp(Irp);
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ObDereferenceObject(_FileObject);
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ExFreePool(FileNameBuffer);
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return ntStatus;
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}
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SecurityContext.SecurityQos = NULL;
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SecurityContext.AccessState = &AccessState;
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SecurityContext.DesiredAccess = DesiredAccess;
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SecurityContext.FullCreateOptions = 0;
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Irp->MdlAddress = NULL;
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Irp->AssociatedIrp.SystemBuffer = NULL;
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Irp->Flags = IRP_CREATE_OPERATION|IRP_SYNCHRONOUS_API;
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Irp->RequestorMode = KernelMode;
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Irp->UserIosb = &IoStatusBlock;
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Irp->UserEvent = &kEvent;
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Irp->PendingReturned = FALSE;
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Irp->Cancel = FALSE;
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Irp->CancelRoutine = NULL;
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Irp->Tail.Overlay.Thread = PsGetCurrentThread();
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Irp->Tail.Overlay.AuxiliaryBuffer = NULL;
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Irp->Tail.Overlay.OriginalFileObject = _FileObject;
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IrpSp = IoGetNextIrpStackLocation(Irp);
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IrpSp->MajorFunction = IRP_MJ_CREATE;
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IrpSp->DeviceObject = DeviceObject;
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IrpSp->FileObject = _FileObject;
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IrpSp->Parameters.Create.SecurityContext = &SecurityContext;
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IrpSp->Parameters.Create.Options = (CreateDisposition << 24) | CreateOptions;
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IrpSp->Parameters.Create.FileAttributes = (USHORT)FileAttributes;
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IrpSp->Parameters.Create.ShareAccess = (USHORT)ShareAccess;
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IrpSp->Parameters.Create.EaLength = 0;
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IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);
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ntStatus = IoCallDriver(DeviceObject, Irp);
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if(ntStatus == STATUS_PENDING)
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KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);
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ntStatus = IoStatusBlock.Status;
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if(!NT_SUCCESS(ntStatus))
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{
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_FileObject->DeviceObject = NULL;
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ObDereferenceObject(_FileObject);
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}
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else
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{//增加引用计数
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InterlockedIncrement(&_FileObject->DeviceObject->ReferenceCount);
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if (_FileObject->Vpb)
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InterlockedIncrement(&_FileObject->Vpb->ReferenceCount);
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*FileObject = _FileObject;
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}
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return ntStatus;
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}
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NTSTATUS
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IoCompletionRoutine(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp,
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IN PVOID Context)
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{
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*Irp->UserIosb = Irp->IoStatus;
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if (Irp->UserEvent)
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KeSetEvent(Irp->UserEvent, IO_NO_INCREMENT, 0);
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if (Irp->MdlAddress)
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{
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IoFreeMdl(Irp->MdlAddress);
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Irp->MdlAddress = NULL;
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}
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IoFreeIrp(Irp);
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return STATUS_MORE_PROCESSING_REQUIRED;
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}
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//查询irp堆栈信息，传入FileObject
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NTSTATUS
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IrpQueryInformationFile(
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IN PFILE_OBJECT FileObject,
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IN PDEVICE_OBJECT DeviceObject,
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OUT PVOID FileInformation,
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IN ULONG Length,
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IN FILE_INFORMATION_CLASS FileInformationClass)
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{
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NTSTATUS ntStatus;
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PIRP Irp;
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KEVENT kEvent;
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PIO_STACK_LOCATION IrpSp;
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IO_STATUS_BLOCK IoStatusBlock;
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// if (FileObject->Vpb == 0 || FileObject->Vpb->DeviceObject == NULL)
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// return STATUS_UNSUCCESSFUL;
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Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
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if(Irp == NULL)
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return STATUS_INSUFFICIENT_RESOURCES;
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KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);
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RtlZeroMemory(FileInformation, Length);
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Irp->AssociatedIrp.SystemBuffer = FileInformation;
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Irp->UserEvent = &kEvent;
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Irp->UserIosb = &IoStatusBlock;
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Irp->RequestorMode = KernelMode;
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Irp->Tail.Overlay.Thread = PsGetCurrentThread();
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Irp->Tail.Overlay.OriginalFileObject = FileObject;
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IrpSp = IoGetNextIrpStackLocation(Irp);
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IrpSp->MajorFunction = IRP_MJ_QUERY_INFORMATION;
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IrpSp->DeviceObject = DeviceObject;
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IrpSp->FileObject = FileObject;
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IrpSp->Parameters.QueryFile.Length = Length;
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IrpSp->Parameters.QueryFile.FileInformationClass = FileInformationClass;
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IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);
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ntStatus = IoCallDriver(DeviceObject, Irp);
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if (ntStatus == STATUS_PENDING)
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KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);
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return IoStatusBlock.Status;
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}
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//Irp请求，将文件读入缓冲区中
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NTSTATUS
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IrpReadFile(
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IN PFILE_OBJECT FileObject,
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IN PDEVICE_OBJECT DeviceObject,
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OUT PIO_STATUS_BLOCK IoStatusBlock,
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OUT PVOID Buffer,
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IN ULONG Length,
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IN PLARGE_INTEGER ByteOffset OPTIONAL)
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{
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NTSTATUS ntStatus;
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PIRP Irp;
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KEVENT kEvent;
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PIO_STACK_LOCATION IrpSp;
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//
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if(ByteOffset == NULL)
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{
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if(!(FileObject->Flags & FO_SYNCHRONOUS_IO))
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return STATUS_INVALID_PARAMETER;
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ByteOffset = &FileObject->CurrentByteOffset;
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}
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Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
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if(Irp == NULL) return STATUS_INSUFFICIENT_RESOURCES;
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RtlZeroMemory(Buffer, Length);
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if(FileObject->DeviceObject->Flags & DO_BUFFERED_IO) //缓冲方式
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{
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Irp->AssociatedIrp.SystemBuffer = Buffer;
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}
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else if(FileObject->DeviceObject->Flags & DO_DIRECT_IO) //直接方式
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{
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Irp->MdlAddress = IoAllocateMdl(Buffer, Length, 0, 0, 0);
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if (Irp->MdlAddress == NULL)
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{
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IoFreeIrp(Irp);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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MmBuildMdlForNonPagedPool(Irp->MdlAddress);
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}
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else //其他方式
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{
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Irp->UserBuffer = Buffer;
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}
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KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);
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Irp->UserEvent = &kEvent;
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Irp->UserIosb = IoStatusBlock;
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Irp->RequestorMode = KernelMode;
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Irp->Flags = IRP_READ_OPERATION;
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Irp->Tail.Overlay.Thread = PsGetCurrentThread();
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Irp->Tail.Overlay.OriginalFileObject = FileObject;
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IrpSp = IoGetNextIrpStackLocation(Irp);
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IrpSp->MajorFunction = IRP_MJ_READ;
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IrpSp->MinorFunction = IRP_MN_NORMAL;
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IrpSp->DeviceObject = DeviceObject;
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IrpSp->FileObject = FileObject;
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IrpSp->Parameters.Read.Length = Length;
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IrpSp->Parameters.Read.ByteOffset = *ByteOffset;
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IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);
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ntStatus = IoCallDriver(DeviceObject, Irp);
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if (ntStatus == STATUS_PENDING)
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KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);
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return IoStatusBlock->Status;
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}
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