elva

				;**************************************************************************************************
;Author:dge/D哥
;Date  :2006.7.20
;**************************************************************************************************
;f:\masm32\bin\ml /nologo /c /coff HookAPI.asm
;C:\>f:\masm32\bin\link /nologo /driver /base:0x10000 /align:32 /out:HookAPI.sys /subsystem:native HookAPI.obj


.386

.
model flat
,
 stdcall
option casemap
:
none

;**************************************************************************************************

include f:\masm32\include\w2k\ntstatus.inc
include f:\masm32\include\w2k\ntddk.inc
include f:\masm32\include\w2k\ntoskrnl.inc
includelib f:\masm32\lib\w2k\ntoskrnl.lib
include f:\masm32\Macros\Strings.mac
;**************************************************************************************************
.data
;保存地址
dwOldNtLoadDriver   dd            ?
dwAddr              dd            ?
dwDriverName        ANSI_STRING  <?>
.const
CCOUNTED_UNICODE_STRING "\\Device\\devHookApi", g_usDeviceName, 4
CCOUNTED_UNICODE_STRING "\\??\\slHookApi", g_usSymbolicLinkName, 4
CCOUNTED_UNICODE_STRING "ZwLoadDriver", g_usRoutineAddr, 4
;**************************************************************************************************
.code
;让这个函数在NtLoadDriver的调用时被执行以实现监视
NewNtLoadDriver     proc  lpDriverName:PUNICODE_STRING
pushad
;      int 3
;                   invoke DbgPrint, $CTA0("\nEntry into NEW\n")
      invoke RtlUnicodeStringToAnsiString, addr dwDriverName, lpDriverName,TRUE
invoke DbgPrint, $CTA0("\nDriverName: %s.sys\n"), dwDriverName.Buffer
popad
;调用原函数
      push   lpDriverName
call   dwOldNtLoadDriver
ret
NewNtLoadDriver     endp
;**************************************************************************************************
HookFunction        proc

                    pushad
;      int 3
;      invoke DbgPrint, $CTA0("\nEntry into hoookfunction\n")
;下面是用KeServiceDescriptorTabled导出符号获得数组的基地址，这个数组中包含有NtXXXX函数的入口地址。
      mov eax, KeServiceDescriptorTable
mov esi, [eax]
mov esi, [esi]
;用MmGetSystemRoutineAddress来获得函数ZwLoadDriver的地址。并从这个函数地址后面的第2个字节中取得服务号。从而
;获得以服务号为下标的数组元素。
             invoke MmGetSystemRoutineAddress,addr g_usRoutineAddr
inc eax
movzx ecx,byte ptr[eax]
sal ecx,2
      add esi,ecx
mov dwAddr,esi
      mov edi,dword ptr[esi]
;保存旧的函数地址。
      mov dwOldNtLoadDriver,edi
mov edi,offset NewNtLoadDriver
;修改入口地址
      cli
      mov dword ptr[esi],edi
sti
popad
mov eax, STATUS_SUCCESS
ret
HookFunction     endp
;**************************************************************************************************
DispatchCreateClose proc pDeviceObject:PDEVICE_OBJECT, pIrp:PIRP
mov eax, pIrp
assume eax:ptr _IRP
mov [eax].IoStatus.Status, STATUS_SUCCESS
and [eax].IoStatus.Information, 0
assume eax:nothing 

             invoke  IoCompleteRequest, pIrp, IO_NO_INCREMENT
mov eax, STATUS_SUCCESS
ret
DispatchCreateClose endp
;**************************************************************************************************
DriverUnload        proc pDriverObject:PDRIVER_OBJECT
;必须保存环境，否则后果很严重。在这个函数中恢复被修改的地址。

                   pushad
;             int 3
;                   invoke DbgPrint, $CTA0("\nEntry into DriverUnload \n")
                    mov esi,dwAddr
mov eax,dwOldNtLoadDriver
cli
mov dword ptr[esi],eax
sti
invoke IoDeleteSymbolicLink, addr g_usSymbolicLinkName
mov eax,pDriverObject
invoke IoDeleteDevice, (DRIVER_OBJECT PTR [eax]).DeviceObject
             popad

             ret
DriverUnload endp
;**************************************************************************************************
DriverEntry         proc pDriverObject:PDRIVER_OBJECT, pusRegistryPath:PUNICODE_STRING
local status:NTSTATUS
local pDeviceObject:PDEVICE_OBJECT
;                   int 3
;             invoke DbgPrint, $CTA0("\nEntry into DriverEntry\n")
             mov status, STATUS_DEVICE_CONFIGURATION_ERROR
invoke IoCreateDevice, pDriverObject, 0, addr g_usDeviceName, FILE_DEVICE_UNKNOWN, 0, FALSE, addr pDeviceObject
.if eax == STATUS_SUCCESS
invoke IoCreateSymbolicLink, addr g_usSymbolicLinkName, addr g_usDeviceName
.if eax == STATUS_SUCCESS
mov eax, pDriverObject
assume eax:ptr DRIVER_OBJECT
mov [eax].DriverUnload,            offset DriverUnload
mov [eax].MajorFunction[IRP_MJ_CREATE*(sizeof PVOID)],        offset DispatchCreateClose
mov [eax].MajorFunction[IRP_MJ_CLOSE*(sizeof PVOID)],         offset DispatchCreateClose
assume eax:nothing
                                          invoke HookFunction
mov status, STATUS_SUCCESS
.else
invoke IoDeleteDevice, pDeviceObject
.endif
.endif
             mov eax, status
ret
DriverEntry         endp

end DriverEntry
;**************************************************************************************************