这个思路来源于2008年360竞赛的文件保护题，要解决得问题是IopCreateFile并未导出，其函数的参数也比IoCreateFile多几个，由于我逆了其给得驱动文件，所以代码也就仿照其写的，尽量做到最大还原，下面给出完整得源代码，自己写make文件通过DDK编译一下即可：
#include <ntddk.h>
#include <windef.h>
#include <string.h>
ULONG OldFuncAddr;
ULONG Pdrange;
ULONG g_uCr0=0;
void WPOFF();
void WPON();
int MyHookProc();
void MyUnhookProc();
ULONG GetFunctionAddr(IN PCWSTR FunctionName);
void DriverUnload(PDRIVER_OBJECT pDriverObject);
NTSTATUS (*Iocreatefile)(PHANDLE FileHandle,
ACCESS_MASK DesiredAccess,
POBJECT_ATTRIBUTES ObjectAttributes,
PIO_STATUS_BLOCK IoStatusBlock,
PLARGE_INTEGER AllocationSize,
ULONG FileAttributes,
ULONG ShareAccess,
ULONG Disposition,
ULONG CreateOptions,
PVOID EaBuffer OPTIONAL,
ULONG EaLength,
CREATE_FILE_TYPE CreateFileType,
PVOID InternalParameters,
ULONG Options,
int Esi01,
int Esi02);
void DriverUnload(PDRIVER_OBJECT pDriverObject)
{
DbgPrint("Unload Called \r\n");
}
//自己函数用以替代系统IoCreateFile的函数
NTSTATUS MYIoCreateFile(PHANDLE FileHandle, ACCESS_MASK DesiredAccess, POBJECT_ATTRIBUTES ObjectAttributes, PIO_STATUS_BLOCK IoStatusBlock, PLARGE_INTEGER AllocationSize, ULONG FileAttributes, ULONG ShareAccess, ULONG Disposition, ULONG CreateOptions, PVOID EaBuffer, ULONG EaLength, CREATE_FILE_TYPE CreateFileType, PVOID ExtraCreateParameters,
ULONG Options,int Esi01, int Esi02)
{
NTSTATUS status, OringinalReturn;
ANSI_STRING FullName;
POBJECT_ATTRIBUTES objectattributes;
status = (Iocreatefile)(FileHandle,
DesiredAccess,
ObjectAttributes,
IoStatusBlock,
AllocationSize,
FileAttributes,
ShareAccess,
Disposition,
CreateOptions,
EaBuffer,
EaLength,
CreateFileType,
ExtraCreateParameters,
Options,
Esi01,
Esi02);
OringinalReturn=status;
if (status>=0)
{
RtlUnicodeStringToAnsiString(&FullName,ObjectAttributes->ObjectName,TRUE);
RtlUpperString(&FullName,&FullName);
if (strstr(FullName.Buffer,"360GAME.TXT"))
{
DbgPrint("FIle Fullname=%Z\n",&FullName);
*(DWORD*)FileHandle=-1;
status=STATUS_ACCESS_DENIED;
}else
{
status=OringinalReturn;
}
}
return status;
}
NTSTATUS DriverEntry( IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath )
{
DriverObject->DriverUnload=DriverUnload;
OldFuncAddr=(ULONG)GetFunctionAddr(L"IoCreateFile");
DbgPrint("IoCreateFile Address=0x%8.1x\n",OldFuncAddr);
MyHookProc();
return STATUS_SUCCESS;
}
ULONG GetFunctionAddr(IN PCWSTR FunctionName)
{
UNICODE_STRING HookFunctionName;
RtlInitUnicodeString(&HookFunctionName,FunctionName);
return (ULONG)MmGetSystemRoutineAddress(&HookFunctionName);
}
//Hook IoCreateFile过程
int MyHookProc()
{
KSPIN_LOCK spinlock;
KIRQL oldirql;
ULONG fiAddress,fiContent,HookAddress;
ULONG NewOffset;
int result;
BOOL NotFindHook=FALSE;
Pdrange=OldFuncAddr + 0x100;
fiAddress=OldFuncAddr;
if (OldFuncAddr<;Pdrange)
{
while (1)
{
if (*(DWORD*)fiAddress == 0xE80875FF)
{
//后面4个字节的内容
fiContent=*(DWORD*)(fiAddress+4);
//找到Hook函数的地址
HookAddress=fiAddress+fiContent +8;
DbgPrint("address=0x%x ,Content =0x%x,Hook address=0x%x\n",fiAddress,*(DWORD*)fiAddress,HookAddress);
//如果地址合法
if (MmIsAddressValid((PVOID)(HookAddress)))
break;
if (fiAddress >= Pdrange)
{
NotFindHook=TRUE;
goto continue11;
}
}
fiAddress++;
}
_asm{
mov eax,HookAddress
mov Iocreatefile,eax
}
}
continue11:
if (!NotFindHook)
{
NewOffset=(ULONG)MYIoCreateFile - (ULONG)fiAddress - 8;
//进行inline Hook,加入自旋锁，防止多核访问
KeInitializeSpinLock(&spinlock);
KeAcquireSpinLock(&spinlock,&oldirql);
WPOFF();
*(DWORD*)(fiAddress +4)=NewOffset;
WPON();
KeReleaseSpinLock(&spinlock, oldirql);
result=1;
}
else
{
result=0;
}
return result;
}
void WPOFF()
{
_asm
{
push eax;
mov eax, cr0;
mov g_uCr0, eax;
and eax, 0x0FFFEFFFF; // CR0 16 BIT = 0
mov cr0, eax;
pop eax;
cli
};
}
void WPON()
{
_asm
{
sti
push eax;
mov eax, g_uCr0; //恢復原有 CR0 屬性
mov cr0, eax;
pop eax;
};
}
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