//作者：Tesla.Angela [www.vb-asm.com]

#include <ntddk.h>

typedef struct _SYSTEM_SERVICE_TABLE{
	PVOID  		ServiceTableBase; 
	PVOID  		ServiceCounterTableBase; 
	ULONGLONG  	NumberOfServices; 
	PVOID  		ParamTableBase; 
} SYSTEM_SERVICE_TABLE, *PSYSTEM_SERVICE_TABLE;

typedef struct _SERVICE_DESCRIPTOR_TABLE{
	SYSTEM_SERVICE_TABLE ntoskrnl;  // ntoskrnl.exe (native api)
	SYSTEM_SERVICE_TABLE win32k;    // win32k.sys   (gdi/user)
	SYSTEM_SERVICE_TABLE Table3;    // not used
	SYSTEM_SERVICE_TABLE Table4;    // not used
}SERVICE_DESCRIPTOR_TABLE,*PSERVICE_DESCRIPTOR_TABLE;
//
typedef NTSTATUS ( __stdcall *NTDeviceIoControlFile)(//__stdcall  // _cdcel  //fastcall  三种模式都试过，都没有正常
	IN HANDLE FileHandle,
	IN HANDLE Event OPTIONAL,
	IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
	IN PVOID ApcContext OPTIONAL,
	OUT PIO_STATUS_BLOCK IoStatusBlock,
	IN ULONG IoControlCode,
	IN PVOID InputBuffer OPTIONAL,
	IN ULONG InputBufferLength,
	OUT PVOID OutputBuffer OPTIONAL,
	IN ULONG OutputBufferLength);

NTKERNELAPI
UCHAR *
PsGetProcessImageFileName(PEPROCESS Process);

PSYSTEM_SERVICE_TABLE KeServiceDescriptorTable;
NTDeviceIoControlFile NtDeviceIoControlFile=NULL;
ULONG OldTpVal;

NTSTATUS __stdcall Fake_NtDeviceIoControlFile(//__stdcall  // _cdcel  //fastcall  三种模式都试过，都没有正常
	IN HANDLE FileHandle,
	IN HANDLE Event OPTIONAL,
	IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
	IN PVOID ApcContext OPTIONAL,
	OUT PIO_STATUS_BLOCK IoStatusBlock,
	IN ULONG IoControlCode,
	IN PVOID InputBuffer OPTIONAL,
	IN ULONG InputBufferLength,
	OUT PVOID OutputBuffer OPTIONAL,
	IN ULONG OutputBufferLength
	)
{
	//HOOK已经正确执行到了这里
	NTSTATUS rc;
	rc = NtDeviceIoControlFile (
		FileHandle,
		Event,
		ApcRoutine,
		ApcContext,
		IoStatusBlock,
		IoControlCode,
		InputBuffer,
		InputBufferLength,
		OutputBuffer,
		OutputBufferLength
		);//这个函数没调用正常，数据类型没有错，API功能出问题了

		return(rc);
	//DbgPrint("Fake_NtDeviceIoControlFile call_end!");


}



/*
NTSTATUS __fastcall Fake_NtDeviceIoControlFile(IN HANDLE ProcessHandle, IN NTSTATUS ExitStatus)//新的函数地址
{
	PEPROCESS Process;
	NTSTATUS st = ObReferenceObjectByHandle (ProcessHandle, 0, *PsProcessType, KernelMode, &Process, NULL);
	DbgPrint("Fake_NtDeviceIoControlFile called!");
	if(NT_SUCCESS(st))
	{
		if(!_stricmp(PsGetProcessImageFileName(Process),"loaddrv.exe")||!_stricmp(PsGetProcessImageFileName(Process),"calc.exe"))
			return STATUS_ACCESS_DENIED;
		else
			return NtDeviceIoControlFile(ProcessHandle,ExitStatus);
	}
	else
		return STATUS_ACCESS_DENIED;
}
*/
KIRQL WPOFFx64()
{
	KIRQL irql=KeRaiseIrqlToDpcLevel();
	UINT64 cr0=__readcr0();
	cr0 &= 0xfffffffffffeffff;
	__writecr0(cr0);
	_disable();
	return irql;
}

void WPONx64(KIRQL irql)
{
	UINT64 cr0=__readcr0();
	cr0 |= 0x10000;
	_enable();
	__writecr0(cr0);
	KeLowerIrql(irql);
}

ULONGLONG GetKeServiceDescriptorTable64() //鬼佬的方法
{
	char KiSystemServiceStart_pattern[13] = "\x8B\xF8\xC1\xEF\x07\x83\xE7\x20\x25\xFF\x0F\x00\x00";	//睇唔明系么春特征码
	ULONGLONG CodeScanStart = (ULONGLONG)&_strnicmp;
	ULONGLONG CodeScanEnd = (ULONGLONG)&KdDebuggerNotPresent;
	UNICODE_STRING Symbol;
	ULONGLONG i, tbl_address, b;
	for (i = 0; i < CodeScanEnd - CodeScanStart; i++)
	{
		if (!memcmp((char*)(ULONGLONG)CodeScanStart +i, (char*)KiSystemServiceStart_pattern,13))
		{ 
			for (b = 0; b < 50; b++)
			{
				tbl_address = ((ULONGLONG)CodeScanStart+i+b);
				if (*(USHORT*) ((ULONGLONG)tbl_address ) == (USHORT)0x8d4c)
					return ((LONGLONG)tbl_address +7) + *(LONG*)(tbl_address +3);
			}
		}
	}
	return 0;
}

ULONGLONG GetSSDTFuncCurAddr(ULONG id)
{
	LONG dwtmp=0;
	PULONG ServiceTableBase=NULL;
	ServiceTableBase=(PULONG)KeServiceDescriptorTable->ServiceTableBase;
	dwtmp=ServiceTableBase[id];
	dwtmp=dwtmp>>4;
	return (LONGLONG)dwtmp + (ULONGLONG)ServiceTableBase;
}

ULONG GetOffsetAddress(ULONGLONG FuncAddr)
{
	ULONG dwtmp=0;
	PULONG ServiceTableBase=NULL;
	ServiceTableBase=(PULONG)KeServiceDescriptorTable->ServiceTableBase;
	dwtmp=(ULONG)(FuncAddr-(ULONGLONG)ServiceTableBase);
	return dwtmp<<4;
}

VOID FuckKeBugCheckEx()
{
	KIRQL irql;
	ULONGLONG myfun;
	UCHAR jmp_code[]="\x48\xB8\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00\xFF\xE0";
	myfun=(ULONGLONG)Fake_NtDeviceIoControlFile;
	memcpy(jmp_code+2,&myfun,8);
	irql=WPOFFx64();
	memset(KeBugCheckEx,0x90,15);
	memcpy(KeBugCheckEx,jmp_code,12);
	WPONx64(irql);
}

/*
填写KeBugCheckEx的地址
在KeBugCheckEx填写jmp，跳到Fake_NtDeviceIoControlFile
不能直接填写Fake_NtDeviceIoControlFile的地址，因为它们不再同一个4GB
*/
VOID HookSSDT()
{
	KIRQL irql;
	ULONGLONG dwtmp=0;
	PULONG ServiceTableBase=NULL;
	//get old address
	NtDeviceIoControlFile=(NTDeviceIoControlFile)GetSSDTFuncCurAddr(4);
	dprintf("Old_NtDeviceIoControlFile: %llx",(ULONGLONG)NtDeviceIoControlFile);
	//set kebugcheckex
	FuckKeBugCheckEx();
	//show new address
	ServiceTableBase=(PULONG)KeServiceDescriptorTable->ServiceTableBase;
	OldTpVal=ServiceTableBase[4];	//record old offset value
	irql=WPOFFx64();
	ServiceTableBase[4]=GetOffsetAddress((ULONGLONG)KeBugCheckEx);
	WPONx64(irql);
	dprintf("KeBugCheckEx: %llx",(ULONGLONG)KeBugCheckEx);
	dprintf("New_NtDeviceIoControlFile: %llx",GetSSDTFuncCurAddr(4));
	
}

VOID UnhookSSDT()
{
	KIRQL irql;
	PULONG ServiceTableBase=NULL;
	ServiceTableBase=(PULONG)KeServiceDescriptorTable->ServiceTableBase;
	//set value
	irql=WPOFFx64();
	ServiceTableBase[4]=GetOffsetAddress((ULONGLONG)NtDeviceIoControlFile);	//OldTpVal;	//直接填写这个旧值也行
	WPONx64(irql);
	//没必要恢复KeBugCheckEx的内容了，反正执行到KeBugCheckEx时已经完蛋了。
	dprintf("NtDeviceIoControlFile: %llx",GetSSDTFuncCurAddr(4));
	
}

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