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1、背景

  Object Type Hook 是基于 Object Type的一种深入的 Hook，比起常用的 SSDT Hook 更为深入。

  有关 Object Type 的分析见文章 《Windows驱动开发学习记录-ObjectType Hook之ObjectType结构相关分析》。

  这里进行的 Hook 为 其中之一的 ParseProcedure。文章实现注册表 Key 对象的过滤。

2、ParseProcedure 函数声明

  见文章 《Windows驱动开发学习记录-ObjectType Hook之ObjectType结构相关分析》。

  这里取 x64 环境下结构：

typedef NTSTATUS (*OB_PARSE_METHOD)(IN PVOID ParseObject,IN PVOID ObjectType,IN OUT PACCESS_STATE AccessState,IN KPROCESSOR_MODE AccessMode,IN ULONG Attributes,IN OUT PUNICODE_STRING CompleteName,IN OUT PUNICODE_STRING RemainingName,IN OUT PVOID Context OPTIONAL,IN PSECURITY_QUALITY_OF_SERVICE SecurityQos OPTIONAL,OUT PVOID *Object);

  在Win11 x64 环境下结构如下：

typedef NTSTATUS (*OB_PARSE_METHOD)(IN PVOID ParseObject,IN PVOID ObjectType,IN OUT PACCESS_STATE AccessState,IN KPROCESSOR_MODE AccessMode,IN ULONG Attributes,IN OUT PUNICODE_STRING CompleteName,IN OUT PUNICODE_STRING RemainingName,IN OUT PVOID Context OPTIONAL,IN PSECURITY_QUALITY_OF_SERVICE SecurityQos OPTIONAL,IN POB_EXTENDED_PARSE_PARAMETERS Paramters,  //Win 11上有这个参数 OUT PVOID *Object);

3、Key 对象过滤

3.1 实验目标

  这里实现对注册表 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run 键值过滤，达到不能打开该键的逻辑。

3.2 实现逻辑

  经过实验分析以及在小节 2 中的结构声明，对于路径的判断可以先用 ObQueryNameString 查询参数 ParseObject，得到一个路径。 

  但该路径并不一定是完整的全路径，需要再附加上参数 RemainingName 所对应的路径，加上该路径后的就是完整的全路径。

  Key对象的指针是导出的，可以直接使用，名称为 CmKeyObjectType, 也可以参考 《遍历Windows内核ObjectType》来获取。

3.3 实现代码

#if DBG
#define KDPRINT(projectName, format, ...) DbgPrintEx(DPFLTR_IHVDRIVER_ID, DPFLTR_ERROR_LEVEL,\projectName "::【" __FUNCTION__  "】" ##format, \##__VA_ARGS__ ) 
#else
#define KDPRINT(format, ...)
#endiftypedef struct _OBJECT_TYPE_FLAGS {UCHAR CaseInsensitive : 1;UCHAR UnnamedObjectsOnly : 1;UCHAR UseDefaultObject : 1;UCHAR SecurityRequired : 1;UCHAR MaintainHandleCount : 1;UCHAR MaintainTypeList : 1;UCHAR SupportsObjectCallbacks : 1;UCHAR CacheAligned : 1;
}OBJECT_TYPE_FLAGS, * P_OBJECT_TYPE_FLAGS;typedef struct _OB_EXTENDED_PARSE_PARAMETERS
{USHORT Length;ULONG  RestrictedAccessMask;PVOID Silo;
}OB_EXTENDED_PARSE_PARAMETERS, *POB_EXTENDED_PARSE_PARAMETERS;typedef struct _OBJECT_TYPE_INITIALIZER {USHORT				wLength;OBJECT_TYPE_FLAGS	ObjectTypeFlags;ULONG				ObjcetTypeCode;ULONG				InvalidAttributes;GENERIC_MAPPING		GenericMapping;ULONG				ValidAccessMask;ULONG				RetainAccess;ULONG				PoolType;ULONG				DefaultPagedPoolCharge;ULONG				DefaultNonPagedPoolCharge;PVOID				DumpProcedure;PVOID				OpenProcedure;PVOID				CloseProcedure;PVOID				DeleteProcedure;union {PVOID				ParseProcedure;PVOID				ParseProcedureEx;};PVOID				SecurityProcedure;PVOID				QueryNameProcedure;PVOID				OkayToCloseProcedure;
}OBJECT_TYPE_INITIALIZER, * POBJECT_TYPE_INITIALIZER;typedef struct _OBJECT_TYPE_EX {LIST_ENTRY					TypeList;UNICODE_STRING				Name;ULONGLONG					DefaultObject;ULONG						Index;ULONG						TotalNumberOfObjects;ULONG						TotalNumberOfHandles;ULONG						HighWaterNumberOfObjects;ULONG						HighWaterNumberOfHandles;OBJECT_TYPE_INITIALIZER		TypeInfo;ULONGLONG					TypeLock;ULONG						Key;LIST_ENTRY					CallbackList;
}OBJECT_TYPE_EX, * POBJECT_TYPE_EX;typedef enum _OB_OPEN_REASON {ObCreateHandle,ObOpenHandle,ObDuplicateHandle,ObInheritHandle,ObMaxOpenReason
} OB_OPEN_REASON;typedef
NTSTATUS
(NTAPI* PPARSE_PROCEDURE_EX)(IN PVOID ParseObject,IN POBJECT_TYPE ObjectType,IN OUT PACCESS_STATE AccessState,IN CHAR Flag,IN ULONG Attributes,IN OUT PUNICODE_STRING CompleteName,IN OUT PUNICODE_STRING RemainingName,IN OUT PVOID Context OPTIONAL,IN PSECURITY_QUALITY_OF_SERVICE SecurityQos OPTIONAL,IN POB_EXTENDED_PARSE_PARAMETERS Paramters,  //Win 11上有这个参数 OUT PVOID* Object);typedef struct _OBJECT_TYPE_HOOK_INFORMATION
{POBJECT_TYPE_EX pHookedObject;PPARSE_PROCEDURE_EX pOringinalParseProcedureAddress;
}OBJECT_TYPE_HOOK_INFORMATION, * POBJECT_TYPE_HOOK_INFORMATION;OBJECT_TYPE_HOOK_INFORMATION g_HookInfomation = { 0 };
UNICODE_STRING g_usRunKeyName =
RTL_CONSTANT_STRING(L"*\\REGISTRY\\MACHINE\\SOFTWARE\\MICROSOFT\\WINDOWS\\CURRENTVERSION\\RUN*");
UNICODE_STRING g_usSeperator = RTL_CONSTANT_STRING(L"\\");
NTSTATUS
NTAPI
CustomKeyParseProcedure(IN PVOID ParseObject,IN POBJECT_TYPE ObjectType,IN OUT PACCESS_STATE AccessState,IN CHAR Flag,IN ULONG Attributes,IN OUT PUNICODE_STRING CompleteName,IN OUT PUNICODE_STRING RemainingName,IN OUT PVOID Context OPTIONAL,IN PSECURITY_QUALITY_OF_SERVICE SecurityQos OPTIONAL,IN POB_EXTENDED_PARSE_PARAMETERS Paramters,OUT PVOID* Object)
{NTSTATUS ntStatus = STATUS_SUCCESS;ULONG ulRet = 0;BOOLEAN bFilterKey = false;if (ParseObject && (ObjectType == *CmKeyObjectType)){POBJECT_NAME_INFORMATION pName = (POBJECT_NAME_INFORMATION)ExAllocatePoolWithTag(NonPagedPool, 1024, 'Mut');if (pName){ntStatus = ObQueryNameString(ParseObject, pName, 1024, &ulRet);if (NT_SUCCESS(ntStatus)){//KDPRINT("【ObjectTypeHook】", "ParseObject is %wZ\r\n", &pName->Name);if (RemainingName){//KDPRINT("【ObjectTypeHook】", "CompleteName is %wZ\r\n", CompleteName);//KDPRINT("【ObjectTypeHook】", "RemainingName is %wZ\r\n", RemainingName);pName->Name.MaximumLength = 1024 - sizeof(UNICODE_STRING);RtlAppendUnicodeStringToString(&pName->Name, &g_usSeperator);ntStatus = RtlAppendUnicodeStringToString(&pName->Name, RemainingName);if (NT_SUCCESS(ntStatus)){ if (FsRtlIsNameInExpression(&g_usRunKeyName, &pName->Name, true, NULL)){KDPRINT("【ObjectTypeHook】", "Need Filter Key Path Is %wZ\r\n", &pName->Name);KDPRINT("【ObjectTypeHook】", "Denied Process Id is 0x%08d\r\n", PsGetCurrentProcessId());bFilterKey = true;}}  }     }ExFreePoolWithTag(pName, 'name');}}if (bFilterKey){return STATUS_ACCESS_DENIED;}else{ntStatus = STATUS_SUCCESS;if (g_HookInfomation.pOringinalParseProcedureAddress){ntStatus = g_HookInfomation.pOringinalParseProcedureAddress(ParseObject, ObjectType, AccessState, Flag, Attributes, CompleteName, RemainingName, Context,SecurityQos, Paramters, Object);}return ntStatus;}}void UnHookObjectType()
{KDPRINT("【ObjectTypeHook】", "UnHook...\r\n");if (g_HookInfomation.pHookedObject){InterlockedExchangePointer((PVOID*)(&g_HookInfomation.pHookedObject->TypeInfo.ParseProcedure),g_HookInfomation.pOringinalParseProcedureAddress);}
}VOID DriverUnload(PDRIVER_OBJECT pDriverObject)
{UNREFERENCED_PARAMETER(pDriverObject);KDPRINT("【ObjectTypeHook】", "CurrentProcessId : 0x%p CurrentIRQL : 0x%u \r\n",PsGetCurrentProcessId(),KeGetCurrentIrql());UnHookObjectType();
}EXTERN_C NTSTATUS  DriverEntry(PDRIVER_OBJECT pDriverObject,PUNICODE_STRING pRegistryPath)
{UNREFERENCED_PARAMETER(pDriverObject);UNREFERENCED_PARAMETER(pRegistryPath);NTSTATUS ntStatus = STATUS_SUCCESS;KDPRINT("【ObjectTypeHook】", " Hello Kernel World! CurrentProcessId:0x%p CurrentIRQL:0x%u\r\n",PsGetCurrentProcessId(),KeGetCurrentIrql());pDriverObject->DriverUnload = DriverUnload;g_HookInfomation.pHookedObject = (POBJECT_TYPE_EX)(*CmKeyObjectType);g_HookInfomation.pOringinalParseProcedureAddress =(PPARSE_PROCEDURE_EX)(((POBJECT_TYPE_EX)(*CmKeyObjectType))->TypeInfo.ParseProcedure);InterlockedExchangePointer((PVOID*)(&g_HookInfomation.pHookedObject->TypeInfo.ParseProcedure),CustomKeyParseProcedure);return ntStatus;
}

3.4 实现效果

  安装驱动后去打开注册表 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run 键，效果如下：