#include <Ntddk.h>
#include <winDef.h>
#include <strsafe.h>


#define MAKELONG(a,b) ((ULONG)(((USHORT)(a))|((ULONG)((USHORT)(b))) << 16)) 

void Recover_NtGetContextThread();  //用SDT HOOK来防止驱动对硬件断点的检测
void IDT_HOOK();   
void Modify_Code();  //修改DEBUGPORT为非0


ULONG NtGetContextThread_Addr; //SDT中，原来的NtGetContextThread地址，下同
ULONG NtSetContextThread_Addr;
ULONG Old_Addr;    //IDT 1号向量原来的ISR的地址，
ULONG DebugPort_Addr;  //驱动保护的进程的debugport的 地址

typedef struct _ServiceDescriptorTable 
{ 
    PVOID      ServiceTable;  
    PULONG   Counter;  
    ULONG    LimitNum;
    PBYTE       ArgsTable; 
} 
ServiceDescriptorTable, 
*PServiceDescriptorTable, 
**PPServiceDescriptorTable;
  
extern PServiceDescriptorTable KeServiceDescriptorTable;

#pragma pack(1)
typedef struct _IDTENTRY{
USHORT offsetLow;
USHORT selector;
UCHAR  NoUseful;
UCHAR  segType:4;
UCHAR  segFlag:1;
UCHAR  DPL:2;
UCHAR  present:1;
USHORT offsetHigh;
}IDTENTRY,*PIDTENTRY;   //定义IDT中的每个向量的格式，每个向量占8字节，我们只关心高位偏移和低位偏移就可以了
                                         //加起来就是这个ISR的地址        

typedef struct _IDT{
USHORT limit;
USHORT baseLow;
USHORT baseHigh;
}IDT,*PIDT;
#pragma pack()  //定义IDT的格式，指出基址，大小


void PPON(){
_asm{
  cli
  mov eax,cr0
  or eax,10000h
  mov cr0,eax
  sti
}
}

void PPOFF(){
_asm{
 cli
 mov eax,cr0
 and eax,not 10000h
 mov cr0,eax
 sti
}
}  //这两个函数不解释，你懂得

ULONG GetFuncAddrFromSDT(ULONG index){
ULONG Addr;
_asm{
  push eax
  mov eax,KeServiceDescriptorTable
  mov eax,[eax]
  shr eax,2                       //-->eax/4
  add eax,index  //-->eax/4+index
  shl eax,2   //-->(eax/4+index)*4=eax+index*4
  mov eax,[eax]  
  mov Addr,eax
  pop eax
  }
return Addr;  
}   //从SDT中取得函数地址

ULONG GetAddr(){   //Get the list link start address
#define DEBUG_PORT 0xBC
#define IMAGE_NAME 0x174
#define LIST_ADDR  0x88
ULONG cur=(ULONG)PsGetCurrentProcess();  //Current process must be SYSTEM
ULONG curAddr,startAddr;
curAddr=startAddr=(ULONG)(cur+LIST_ADDR);  //save the start address
do{
if(strcmp((char*)(curAddr-LIST_ADDR+IMAGE_NAME),"DNF.EXE")) curAddr=*(ULONG*)curAddr;  //如果是DNF进程，就搞到它的debugport地址，大家蛋定，DNF是垃圾
   else{
    DebugPort_Addr=(ULONG)(curAddr-LIST_ADDR+DEBUG_PORT);  
break;
}   
}while(curAddr!=startAddr);
return *(ULONG*)(cur+0x114)+0x22C;  //return the thread list head   //返回system的线程当前线程链表首地址，供遍历系统线程使用
}

ULONG SetAllSystemThreads(ULONG ListAddr){
#define THREADLIST_ADDR 0x22C
#define CID_OFFSET 0x1EC
ULONG curAddr,startAddr;
OBJECT_ATTRIBUTES ObjAttr;
PCLIENT_ID cid;
HANDLE h;
CONTEXT con;
NTSTATUS status;
InitializeObjectAttributes(&ObjAttr,0,OBJ_CASE_INSENSITIVE|OBJ_KERNEL_HANDLE,0,0);
curAddr=startAddr=ListAddr;   //你懂得，开始遍历系统线程，没得到一个，都设置对其下硬件断点
do{
cid=(PCLIENT_ID)(ULONG)(curAddr-THREADLIST_ADDR+CID_OFFSET);
//h=NtOpenThread(h,THREAD_ADLL_ACCESS,&ObjAttr,cid);
_asm{
    push eax
    push edx
push 80h
call GetFuncAddrFromSDT  //得到NtOpenThread的函数地址，0x80是它的index
mov edx,eax
push cid
lea eax,ObjAttr
push eax
push THREAD_ALL_ACCESS
push h
call edx  //这几句代码就是 NtOpenThread(h,THEAD_ALL_SUCCESS,&ObjAttr,cid);
             //这里主要起作用的是CLIENT_ID，它能标识出正确的线程
pop edx
pop eax
    }
if(h){   //如果成功打开
   _asm{
    push eax
lea eax,con
push eax
push h
call NtGetContextThread_Addr //等价于NtGetContextThread(h,&con);
mov status,eax
pop eax
    }
   if(NT_SUCCESS(status)){ //如果成功取得上下文
    con.Dr3=DebugPort_Addr; 
con.Dr7=0xD0002080;  //至于为什么这样设置，可以去翻Intel手册，因为实在不好解释
//NtSetContextThread(h,&con);
_asm{
push eax
lea eax,con
push eax
push h
call NtSetContextThread_Addr
pop eax
}
}
ZwClose(h); //关闭句柄
   }
}while(curAddr!=startAddr);
}

NTSTATUS Jmp_NtGetContextThread(
IN HANDLE ThreadHandle,
OUT PCONTEXT Context
){
if(strcmp((char*)((ULONG)PsGetCurrentProcess()+0x174),"DNF.EXE")){  //不要让DNF得到自身的上下文，否则，否则我也不知道会怎样
_asm jmp Jmp_NtGetContextThread
}
else return STATUS_UNSUCCESSFUL;
}

NTSTATUS Jmp_NtSetContextThread(
IN HANDLE ThreadHandle,
IN PCONTEXT Context
){
if(strcmp((char*)((ULONG)PsGetCurrentProcess()+0x174),"DNF.EXE")){  //同上
_asm jmp Jmp_NtSetContextThread
}
else return STATUS_UNSUCCESSFUL;
}
    
void Rcover_NtGetAndSetContextThread(){   //简单的SDT HOOK，至于那段汇编，和前面GetFuncAddrFromSDT雷同
//SSDT HOOK
KIRQL irq;
irq=KeRaiseIrqlToDpcLevel();
PPOFF();
_asm{
sti
push eax
push ebx
mov  eax,KeServiceDescriptorTable
mov eax,[eax]
shr eax,2
add eax,0x55
shl eax,2
mov ebx,[eax]
mov NtGetContextThread_Addr,ebx
mov ebx,Jmp_NtGetContextThread
mov [eax],ebx
shr eax,2
add eax,0x90
shl eax,2
mov ebx,[eax]
mov NtSetContextThread_Addr,ebx
mov ebx,Jmp_NtSetContextThread
mov [eax],ebx
pop ebx
pop eax
sti
}
PPON();
KeLowerIrql(irq);
}

void Unhook_NtGetAndSetContextThread(){
KIRQL irq=KeRaiseIrqlToDpcLevel();
PPOFF();
_asm{
push eax
push ebx
mov eax,KeServiceDescriptorTable
mov eax,[eax]
shr eax,2
add eax,55h
shl eax,2
mov ebx,NtGetContextThread_Addr
mov [eax],ebx
shr eax,2
add eax,90h
shl eax,2
mov ebx,NtSetContextThread_Addr
mov [eax],ebx
pop ebx
pop eax
}
PPON();
KeLowerIrql(irq);
}

void _stdcall Modify_Code(){  //这个驱动核心的功能，把debugport改回来，是不是有点杀鸡用牛刀的感觉了 = =
_asm mov dword ptr[DebugPort_Addr],0x44  //set the value of debugport to nozero
}

_declspec(naked) IDT_ProxyFunc(){  //代理函数，用它替换IDT 一号向量
_asm{
pushad
pushfd
call Modify_Code
popfd
popad
jmp Old_Addr
}
}

void IDT_HOOK(){  //IDT HOOK，简单解释下
IDT idt;
PIDTENTRY entry;
_asm sidt idt   //储存IDT信息到变量idt
entry=(PIDTENTRY)MAKELONG(idt.baseLow,idt.baseHigh); //得到基址
KdPrint(("the base address of IDT is %X",(ULONG)entry));
Old_Addr=(ULONG)MAKELONG(entry[1].offsetLow,entry[1].offsetHigh);  //保存一号向量的原ISR地址
KdPrint(("the NO.1 ISR address is %X",Old_Addr));
PPOFF();
_asm{
//entry[1].offsetLow=(USHORT)(ULONG)&IDT_ProxyFunc;
//entry[1].offsetHigh=(USHORT)((ULONG)&IDT_ProxyFunc>>16);  //分别修改高位和低位偏移，地址就是那个啥，呃，代理函数IDT_ProxyFunc
cli
push eax
push edx
mov eax,entry
add eax,8 //move to next ISR
mov edx,IDT_ProxyFunc
mov word ptr[eax],dx           //****注意了哈****就是这个鸟指令，蓝屏的关键，肯定是eax问题
                                            //但是，运行到此时eax的地址是正确的，为什么？我用windbg看的呗
add eax,6 //move to offsetHigh
shr edx,16
mov word ptr[eax],dx
pop edx
pop eax
sti
}
PPON();  //上面的就是导致蓝屏的代码，我实在郁闷~咋就蓝了呢，我用汇编改写了上面注释的两句C代码
//虽然ASM写的很累赘，但是我只是为了找出哪里导致了蓝屏，大家不要鄙视
//我用notepad++写了几小时代码通宵也不容易诶，一个字一个字母敲，呜呜
}

void IDT_UNHOOK(){  //不解释了，对应IDT_HOOK
IDT idt;
PIDTENTRY entry;
_asm sidt idt
entry=(PIDTENTRY)(ULONG)MAKELONG(idt.baseLow,idt.baseHigh);
_asm cli
entry[1].offsetLow=(USHORT)Old_Addr;
entry[1].offsetHigh=(USHORT)((ULONG)Old_Addr>>16);
_asm sti
}

NTSTATUS DriverUnload(PDRIVER_OBJECT driver){
 Unhook_NtGetAndSetContextThread();
 IDT_UNHOOK();
}

NTSTATUS DriverEntry(PDRIVER_OBJECT driver,PUNICODE_STRING reg){
ULONG ListAddr;
#if DBG
_asm int 3
#endif
driver->DriverUnload=DriverUnload;
Rcover_NtGetAndSetContextThread();
IDT_HOOK();
ListAddr=GetAddr();
if(DebugPort_Addr) SetAllSystemThreads(ListAddr);
}

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