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MyFileDisk.c
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MyFileDisk.c
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#include <ntifs.h>
#include <ntdddisk.h>
#include <ntddcdrm.h>
#include <ntstrsafe.h>
#include <wdmsec.h>
#include <mountmgr.h>
#include <ntddvol.h>
#include <ntddscsi.h>
#include "FileDiskShared.h"
#define DEFAULT_NUMBEROFDEVICES 5
HANDLE dir_handle;
typedef struct _DEVICE_EXTENSION {
BOOLEAN media_in_device;
UNICODE_STRING device_name;
ULONG device_number;
DEVICE_TYPE device_type;
HANDLE file_handle;
UNICODE_STRING file_name;
LARGE_INTEGER file_size;
ANSI_STRING password;
LIST_ENTRY list_head;
KSPIN_LOCK list_lock;
KEVENT request_event;
PVOID thread_pointer;
BOOLEAN terminate_thread;
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;
NTSTATUS DriverEntry (IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath);
NTSTATUS FileDiskCreateDevice (IN PDRIVER_OBJECT DriverObject, IN ULONG Number, IN DEVICE_TYPE DeviceType);
NTSTATUS FileDiskCreateClose (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS FileDiskReadWrite (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS FileDiskDeviceControl (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS FileDiskOpenFile (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS FileDiskCloseFile (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
VOID FileDiskUnload (IN PDRIVER_OBJECT DriverObject);
PDEVICE_OBJECT FileDiskDeleteDevice (IN PDEVICE_OBJECT DeviceObject);
VOID FileDiskThread (IN PVOID Context);
NTSTATUS
DriverEntry (
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath
)
{
ULONG n_devices;
NTSTATUS status;
UNICODE_STRING device_dir_name;
OBJECT_ATTRIBUTES object_attributes;
ULONG n;
USHORT n_created_devices;
n_devices = DEFAULT_NUMBEROFDEVICES;
RtlInitUnicodeString(&device_dir_name, DEVICE_DIR_NAME);
InitializeObjectAttributes(
&object_attributes,
&device_dir_name,
OBJ_PERMANENT,
NULL,
NULL
);
status = ZwCreateDirectoryObject(
&dir_handle,
DIRECTORY_ALL_ACCESS,
&object_attributes
);
if (!NT_SUCCESS(status))
{
return status;
}
ZwMakeTemporaryObject(dir_handle);
for (n = 0, n_created_devices = 0; n < n_devices; n++)
{
status = FileDiskCreateDevice(DriverObject, n, FILE_DEVICE_DISK);
if (NT_SUCCESS(status))
{
n_created_devices++;
}
}
if (n_created_devices == 0)
{
ZwClose(dir_handle);
return status;
}
DriverObject->MajorFunction[IRP_MJ_CREATE] = FileDiskCreateClose;
DriverObject->MajorFunction[IRP_MJ_CLOSE] = FileDiskCreateClose;
DriverObject->MajorFunction[IRP_MJ_READ] = FileDiskReadWrite;
DriverObject->MajorFunction[IRP_MJ_WRITE] = FileDiskReadWrite;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = FileDiskDeviceControl;
DriverObject->DriverUnload = FileDiskUnload;
return STATUS_SUCCESS;
}
NTSTATUS
FileDiskCreateDevice (
IN PDRIVER_OBJECT DriverObject,
IN ULONG Number,
IN DEVICE_TYPE DeviceType
)
{
UNICODE_STRING device_name;
NTSTATUS status;
PDEVICE_OBJECT device_object;
PDEVICE_EXTENSION device_extension;
HANDLE thread_handle;
UNICODE_STRING sddl;
ASSERT(DriverObject != NULL);
device_name.Buffer = (PWCHAR) ExAllocatePoolWithTag(PagedPool, MAXIMUM_FILENAME_LENGTH * 2, FILE_DISK_POOL_TAG);
if (device_name.Buffer == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
device_name.Length = 0;
device_name.MaximumLength = MAXIMUM_FILENAME_LENGTH * 2;
RtlUnicodeStringPrintf(&device_name, DEVICE_NAME_PREFIX L"%u", Number);
//allows the kernel, system, built in user-group, administrator complete control over the device
RtlInitUnicodeString(&sddl, _T("D:P(A;;GA;;;SY)(A;;GA;;;BA)(A;;GA;;;BU)"));
status = IoCreateDeviceSecure(
DriverObject,
sizeof(DEVICE_EXTENSION),
&device_name,
DeviceType,
0,
FALSE,
&sddl,
NULL,
&device_object
);
if (!NT_SUCCESS(status))
{
ExFreePool(device_name.Buffer);
return status;
}
device_object->Flags |= DO_DIRECT_IO;
device_extension = (PDEVICE_EXTENSION) device_object->DeviceExtension;
device_extension->media_in_device = FALSE;
device_extension->device_name.Length = device_name.Length;
device_extension->device_name.MaximumLength = device_name.MaximumLength;
device_extension->device_name.Buffer = device_name.Buffer;
device_extension->device_number = Number;
device_extension->device_type = DeviceType;
InitializeListHead(&device_extension->list_head);
KeInitializeSpinLock(&device_extension->list_lock);
KeInitializeEvent(
&device_extension->request_event,
SynchronizationEvent,
FALSE
);
device_extension->terminate_thread = FALSE;
status = PsCreateSystemThread(
&thread_handle,
(ACCESS_MASK) 0L,
NULL,
NULL,
NULL,
FileDiskThread,
device_object
);
if (!NT_SUCCESS(status))
{
IoDeleteDevice(device_object);
ExFreePool(device_name.Buffer);
return status;
}
status = ObReferenceObjectByHandle(
thread_handle,
THREAD_ALL_ACCESS,
NULL,
KernelMode,
&device_extension->thread_pointer,
NULL
);
if (!NT_SUCCESS(status))
{
ZwClose(thread_handle);
device_extension->terminate_thread = TRUE;
KeSetEvent(
&device_extension->request_event,
(KPRIORITY) 0,
FALSE
);
IoDeleteDevice(device_object);
ExFreePool(device_name.Buffer);
return status;
}
ZwClose(thread_handle);
return STATUS_SUCCESS;
}
VOID
FileDiskUnload (
IN PDRIVER_OBJECT DriverObject
)
{
PDEVICE_OBJECT device_object;
PAGED_CODE();
device_object = DriverObject->DeviceObject;
while (device_object)
{
device_object = FileDiskDeleteDevice(device_object);
}
ZwClose(dir_handle);
}
PDEVICE_OBJECT
FileDiskDeleteDevice (
IN PDEVICE_OBJECT DeviceObject
)
{
PDEVICE_EXTENSION device_extension;
PDEVICE_OBJECT next_device_object;
PAGED_CODE();
ASSERT(DeviceObject != NULL);
device_extension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
device_extension->terminate_thread = TRUE;
KeSetEvent(
&device_extension->request_event,
(KPRIORITY) 0,
FALSE
);
KeWaitForSingleObject(
device_extension->thread_pointer,
Executive,
KernelMode,
FALSE,
NULL
);
ObDereferenceObject(device_extension->thread_pointer);
if (device_extension->device_name.Buffer != NULL)
{
ExFreePool(device_extension->device_name.Buffer);
}
next_device_object = DeviceObject->NextDevice;
IoDeleteDevice(DeviceObject);
return next_device_object;
}
NTSTATUS
FileDiskCreateClose (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
{
UNREFERENCED_PARAMETER(DeviceObject);
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = FILE_OPENED;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
NTSTATUS
FileDiskReadWrite (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
{
PDEVICE_EXTENSION device_extension;
PIO_STACK_LOCATION io_stack;
device_extension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
if (!device_extension->media_in_device)
{
Irp->IoStatus.Status = STATUS_NO_MEDIA_IN_DEVICE;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NO_MEDIA_IN_DEVICE;
}
io_stack = IoGetCurrentIrpStackLocation(Irp);
if (io_stack->Parameters.Read.Length == 0)
{
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
IoMarkIrpPending(Irp);
ExInterlockedInsertTailList(
&device_extension->list_head,
&Irp->Tail.Overlay.ListEntry,
&device_extension->list_lock
);
KeSetEvent(
&device_extension->request_event,
(KPRIORITY) 0,
FALSE
);
return STATUS_PENDING;
}
NTSTATUS
FileDiskDeviceControl (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
{
PDEVICE_EXTENSION device_extension;
PIO_STACK_LOCATION io_stack;
NTSTATUS status;
device_extension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
io_stack = IoGetCurrentIrpStackLocation(Irp);
if (!device_extension->media_in_device &&
io_stack->Parameters.DeviceIoControl.IoControlCode !=
IOCTL_FILE_DISK_OPEN_FILE)
{
Irp->IoStatus.Status = STATUS_NO_MEDIA_IN_DEVICE;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NO_MEDIA_IN_DEVICE;
}
switch (io_stack->Parameters.DeviceIoControl.IoControlCode)
{
case IOCTL_FILE_DISK_OPEN_FILE:
{
if (device_extension->media_in_device)
{
status = STATUS_INVALID_DEVICE_REQUEST;
Irp->IoStatus.Information = 0;
break;
}
if (io_stack->Parameters.DeviceIoControl.InputBufferLength <
sizeof(OPEN_FILE_INFORMATION) +
((POPEN_FILE_INFORMATION)Irp->AssociatedIrp.SystemBuffer)->FileNameLength*sizeof(WCHAR) -
sizeof(WCHAR))
{
status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
IoMarkIrpPending(Irp);
ExInterlockedInsertTailList(
&device_extension->list_head,
&Irp->Tail.Overlay.ListEntry,
&device_extension->list_lock
);
KeSetEvent(
&device_extension->request_event,
(KPRIORITY) 0,
FALSE
);
status = STATUS_PENDING;
break;
}
case IOCTL_FILE_DISK_CLOSE_FILE:
{
IoMarkIrpPending(Irp);
ExInterlockedInsertTailList(
&device_extension->list_head,
&Irp->Tail.Overlay.ListEntry,
&device_extension->list_lock
);
KeSetEvent(
&device_extension->request_event,
(KPRIORITY) 0,
FALSE
);
status = STATUS_PENDING;
break;
}
//case IOCTL_FILE_DISK_QUERY_FILE:
// {
// POPEN_FILE_INFORMATION open_file_information;
// if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
// sizeof(OPEN_FILE_INFORMATION) + device_extension->file_name.Length - sizeof(UCHAR))
// {
// status = STATUS_BUFFER_TOO_SMALL;
// Irp->IoStatus.Information = 0;
// break;
// }
// open_file_information = (POPEN_FILE_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
// open_file_information->FileSize.QuadPart = device_extension->file_size.QuadPart;
// open_file_information->FileNameLength = device_extension->file_name.Length;
// RtlCopyMemory(
// open_file_information->FileName,
// device_extension->file_name.Buffer,
// device_extension->file_name.Length
// );
// status = STATUS_SUCCESS;
// Irp->IoStatus.Information = sizeof(OPEN_FILE_INFORMATION) +
// open_file_information->FileNameLength - sizeof(UCHAR);
// break;
// }
case IOCTL_DISK_CHECK_VERIFY:
case IOCTL_STORAGE_CHECK_VERIFY:
case IOCTL_STORAGE_CHECK_VERIFY2:
{
status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
break;
}
case IOCTL_DISK_GET_DRIVE_GEOMETRY:
{
//Retrieves information about the physical disk's geometry: type, number of cylinders, tracks per cylinder, sectors per track, and bytes per sector.
PDISK_GEOMETRY disk_geometry;
ULONGLONG length;
ULONG sector_size;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(DISK_GEOMETRY))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
disk_geometry = (PDISK_GEOMETRY) Irp->AssociatedIrp.SystemBuffer;
length = device_extension->file_size.QuadPart;
sector_size = 2048;
disk_geometry->Cylinders.QuadPart = length / sector_size / 32 / 2;
disk_geometry->MediaType = FixedMedia;
disk_geometry->TracksPerCylinder = 2;
disk_geometry->SectorsPerTrack = 32;
disk_geometry->BytesPerSector = sector_size;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(DISK_GEOMETRY);
break;
}
case IOCTL_DISK_GET_LENGTH_INFO:
{
//Retrieves information about the type, size, and nature of a disk partition.
PGET_LENGTH_INFORMATION get_length_information;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(GET_LENGTH_INFORMATION))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
get_length_information = (PGET_LENGTH_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
get_length_information->Length.QuadPart = device_extension->file_size.QuadPart;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(GET_LENGTH_INFORMATION);
break;
}
case IOCTL_DISK_GET_PARTITION_INFO:
{
PPARTITION_INFORMATION partition_information;
ULONGLONG length;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(PARTITION_INFORMATION))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
partition_information = (PPARTITION_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
length = device_extension->file_size.QuadPart;
partition_information->StartingOffset.QuadPart = 0;
partition_information->PartitionLength.QuadPart = length;
partition_information->HiddenSectors = 1;
partition_information->PartitionNumber = 0;
partition_information->PartitionType = 0;
partition_information->BootIndicator = FALSE;
partition_information->RecognizedPartition = FALSE;
partition_information->RewritePartition = FALSE;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(PARTITION_INFORMATION);
break;
}
case IOCTL_DISK_GET_PARTITION_INFO_EX:
{
//Retrieves extended information about the type, size, and nature of a disk partition.
PPARTITION_INFORMATION_EX partition_information_ex;
ULONGLONG length;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(PARTITION_INFORMATION_EX))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
partition_information_ex = (PPARTITION_INFORMATION_EX) Irp->AssociatedIrp.SystemBuffer;
length = device_extension->file_size.QuadPart;
partition_information_ex->PartitionStyle = PARTITION_STYLE_MBR;
partition_information_ex->StartingOffset.QuadPart = 0;
partition_information_ex->PartitionLength.QuadPart = length;
partition_information_ex->PartitionNumber = 0;
partition_information_ex->RewritePartition = FALSE;
partition_information_ex->Mbr.PartitionType = 0;//Contains partition information specific to master boot record (MBR) disks.
partition_information_ex->Mbr.BootIndicator = FALSE;
partition_information_ex->Mbr.RecognizedPartition = FALSE;
partition_information_ex->Mbr.HiddenSectors = 1;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(PARTITION_INFORMATION_EX);
break;
}
case IOCTL_DISK_IS_WRITABLE:
{
status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
break;
}
case IOCTL_DISK_MEDIA_REMOVAL:
case IOCTL_STORAGE_MEDIA_REMOVAL:
{
//Enables or disables the mechanism that ejects media, for those devices possessing that locking capability.
status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
break;
}
case IOCTL_DISK_SET_PARTITION_INFO:
{
//Sets partition information for the specified disk partition.
if (io_stack->Parameters.DeviceIoControl.InputBufferLength <
sizeof(SET_PARTITION_INFORMATION))
{
status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
break;
}
case IOCTL_DISK_VERIFY:
{
//Verifies the specified extent on a fixed disk.
PVERIFY_INFORMATION verify_information;
if (io_stack->Parameters.DeviceIoControl.InputBufferLength <
sizeof(VERIFY_INFORMATION))
{
status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
verify_information = (PVERIFY_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = verify_information->Length;
break;
}
case IOCTL_STORAGE_GET_DEVICE_NUMBER:
{
PSTORAGE_DEVICE_NUMBER number;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(STORAGE_DEVICE_NUMBER))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
number = (PSTORAGE_DEVICE_NUMBER) Irp->AssociatedIrp.SystemBuffer;
number->DeviceType = device_extension->device_type;
number->DeviceNumber = device_extension->device_number;
number->PartitionNumber = (ULONG) -1;//device can not be partioned
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(STORAGE_DEVICE_NUMBER);
break;
}
case IOCTL_STORAGE_GET_HOTPLUG_INFO:
{
PSTORAGE_HOTPLUG_INFO info;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(STORAGE_HOTPLUG_INFO))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
info = (PSTORAGE_HOTPLUG_INFO) Irp->AssociatedIrp.SystemBuffer;
info->Size = sizeof(STORAGE_HOTPLUG_INFO);
info->MediaRemovable = 0;
info->MediaHotplug = 0;
info->DeviceHotplug = 0;
info->WriteCacheEnableOverride = 0;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(STORAGE_HOTPLUG_INFO);
break;
}
case IOCTL_VOLUME_GET_GPT_ATTRIBUTES:
{
//Retrieves the attributes for a volume.
//GUID Partition table
PVOLUME_GET_GPT_ATTRIBUTES_INFORMATION attr;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(VOLUME_GET_GPT_ATTRIBUTES_INFORMATION))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
attr = (PVOLUME_GET_GPT_ATTRIBUTES_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
attr->GptAttributes = 0;//means nothing , non hidden....
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(VOLUME_GET_GPT_ATTRIBUTES_INFORMATION);
break;
}
case IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS:
{
//Retrieves the physical location of a specified volume on one or more disks.
PVOLUME_DISK_EXTENTS ext;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(VOLUME_DISK_EXTENTS))
{
status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
ext = (PVOLUME_DISK_EXTENTS) Irp->AssociatedIrp.SystemBuffer;
ext->NumberOfDiskExtents = 1;
ext->Extents[0].DiskNumber = device_extension->device_number;
ext->Extents[0].StartingOffset.QuadPart = 0;
ext->Extents[0].ExtentLength.QuadPart = device_extension->file_size.QuadPart;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(VOLUME_DISK_EXTENTS) /*+ ((NumberOfDiskExtents - 1) * sizeof(DISK_EXTENT))*/;
break;
}
case IOCTL_DISK_IS_CLUSTERED:
{
//Just answer no
PBOOLEAN clus;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(BOOLEAN))
{
status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
clus = (PBOOLEAN) Irp->AssociatedIrp.SystemBuffer;
*clus = FALSE;
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(BOOLEAN);
break;
}
case IOCTL_MOUNTDEV_QUERY_DEVICE_NAME:
{
//Upon receiving this IOCTL a client driver must provide the (nonpersistent) device (or target) name for the volume.
PMOUNTDEV_NAME name;
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
sizeof(MOUNTDEV_NAME))
{
status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
name = (PMOUNTDEV_NAME) Irp->AssociatedIrp.SystemBuffer;
name->NameLength = device_extension->device_name.Length * sizeof(WCHAR);
if (io_stack->Parameters.DeviceIoControl.OutputBufferLength <
name->NameLength + sizeof(USHORT))
{
status = STATUS_BUFFER_OVERFLOW;
Irp->IoStatus.Information = sizeof(MOUNTDEV_NAME);
break;
}
RtlCopyMemory(name->Name, device_extension->device_name.Buffer, name->NameLength);
status = STATUS_SUCCESS;
Irp->IoStatus.Information = name->NameLength + sizeof(USHORT);
break;
}
default:
{
KdPrint((
"FileDisk: Unknown IoControlCode %#x\n",
io_stack->Parameters.DeviceIoControl.IoControlCode
));
status = STATUS_INVALID_DEVICE_REQUEST;
Irp->IoStatus.Information = 0;
}
}
if (status != STATUS_PENDING)
{
Irp->IoStatus.Status = status;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
}
return status;
}
VOID
FileDiskThread (
IN PVOID Context
)
{
PDEVICE_OBJECT device_object;
PDEVICE_EXTENSION device_extension;
PLIST_ENTRY request;
PIRP irp;
PIO_STACK_LOCATION io_stack;
PUCHAR system_buffer;
PUCHAR buffer;
ULONGLONG i = 0, j = 0;
PAGED_CODE();
ASSERT(Context != NULL);
device_object = (PDEVICE_OBJECT) Context;
device_extension = (PDEVICE_EXTENSION) device_object->DeviceExtension;
KeSetPriorityThread(KeGetCurrentThread(), LOW_REALTIME_PRIORITY);
for (;;)
{
KeWaitForSingleObject(
&device_extension->request_event,
Executive,
KernelMode,
FALSE,
NULL
);
if (device_extension->terminate_thread)
{
PsTerminateSystemThread(STATUS_SUCCESS);
}
while ((request = ExInterlockedRemoveHeadList(
&device_extension->list_head,
&device_extension->list_lock
)) != NULL)
{
irp = CONTAINING_RECORD(request, IRP, Tail.Overlay.ListEntry);
io_stack = IoGetCurrentIrpStackLocation(irp);
switch (io_stack->MajorFunction)
{
case IRP_MJ_READ:
j = io_stack->Parameters.Read.ByteOffset.QuadPart % device_extension->password.Length;
system_buffer = (PUCHAR) MmGetSystemAddressForMdlSafe(irp->MdlAddress, NormalPagePriority);
if (system_buffer == NULL)
{
irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
irp->IoStatus.Information = 0;
break;
}
buffer = (PUCHAR) ExAllocatePoolWithTag(PagedPool, io_stack->Parameters.Read.Length, FILE_DISK_POOL_TAG);
if (buffer == NULL)
{
irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
irp->IoStatus.Information = 0;
break;
}
ZwReadFile(
device_extension->file_handle,
NULL,
NULL,
NULL,
&irp->IoStatus,
buffer,
io_stack->Parameters.Read.Length,
&io_stack->Parameters.Read.ByteOffset,
NULL
);
for (i=0, j; i < io_stack->Parameters.Read.Length; ++i, j++)
{
j == device_extension->password.Length ? j = 0 : j;
buffer[i] ^= device_extension->password.Buffer[j];
}
RtlCopyMemory(system_buffer, buffer, io_stack->Parameters.Read.Length);
ExFreePool(buffer);
break;
case IRP_MJ_WRITE:
j = io_stack->Parameters.Write.ByteOffset.QuadPart % device_extension->password.Length;
if ((io_stack->Parameters.Write.ByteOffset.QuadPart +
io_stack->Parameters.Write.Length) >
device_extension->file_size.QuadPart)
{
irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
irp->IoStatus.Information = 0;
break;
}
system_buffer = MmGetSystemAddressForMdlSafe(irp->MdlAddress, NormalPagePriority);
buffer = (PUCHAR)ExAllocatePoolWithTag(PagedPool, io_stack->Parameters.Write.Length, FILE_DISK_POOL_TAG);
if (buffer == NULL)
{
irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
irp->IoStatus.Information = 0;
break;
}
RtlCopyMemory(buffer, system_buffer, io_stack->Parameters.Write.Length);
for (i=0, j; i < io_stack->Parameters.Write.Length; ++i, j++)
{
j == device_extension->password.Length ? j = 0 : j;
buffer[i] ^= device_extension->password.Buffer[j];
}
ZwWriteFile(
device_extension->file_handle,
NULL,
NULL,
NULL,
&irp->IoStatus,
buffer,
io_stack->Parameters.Write.Length,
&io_stack->Parameters.Write.ByteOffset,
NULL
);
ExFreePool(buffer);
break;
case IRP_MJ_DEVICE_CONTROL:
switch (io_stack->Parameters.DeviceIoControl.IoControlCode)
{
case IOCTL_FILE_DISK_OPEN_FILE:
irp->IoStatus.Status = FileDiskOpenFile(device_object, irp);
break;
case IOCTL_FILE_DISK_CLOSE_FILE:
irp->IoStatus.Status = FileDiskCloseFile(device_object, irp);
break;
default:
irp->IoStatus.Status = STATUS_DRIVER_INTERNAL_ERROR;
}
break;
default:
irp->IoStatus.Status = STATUS_DRIVER_INTERNAL_ERROR;
}
IoCompleteRequest(
irp,
(CCHAR) (NT_SUCCESS(irp->IoStatus.Status) ?
IO_DISK_INCREMENT : IO_NO_INCREMENT)
);
}
}
}