5.4 Windows驱动开发：内核通过PEB取进程参数

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PEB结构(Process Envirorment Block Structure)其中文名是进程环境块信息，进程环境块内部包含了进程运行的详细参数信息，每一个进程在运行后都会存在一个特有的PEB结构，通过附加进程并遍历这段结构即可得到非常多的有用信息。

在应用层下，如果想要得到PEB的基地址只需要取fs:[0x30]即可，TEB线程环境块则是fs:[0x18]，如果在内核层想要得到应用层进程的PEB信息我们需要调用特定的内核函数来获取。

在内核层要获取应用层进程的PEB结构，可以通过以下步骤实现：

• 1.调用内核函数PsGetCurrentProcess获取当前进程的EPROCESS结构。
• 2.调用内核函数KeStackAttachProcess，附加到目标进程。
• 3.调用内核函数PsGetProcessWow64Process，获取目标进程的PEB结构信息。
• 4.通过PEB结构的Ldr成员可以访问到该进程加载的所有模块，遍历整个Ldr链表即可得到需要的模块信息。
• 5.遍历完成后，通过调用KeUnstackDetachProcess函数脱离进程空间。

首先在开始写代码之前需要先定义好PEB进程环境快结构体，用于对内存指针解析，新建peb.h文件并保存如下代码，这些是微软的结构定义分为32位与64位，官方定义规范而已不需要费工夫。

#pragma once
#include <ntifs.h>typedef struct _CURDIR              // 2 elements, 0x18 bytes (sizeof) 
{/*0x000*/     struct _UNICODE_STRING DosPath; // 3 elements, 0x10 bytes (sizeof) /*0x010*/     VOID*        Handle;
}CURDIR, *PCURDIR;typedef struct _RTL_DRIVE_LETTER_CURDIR // 4 elements, 0x18 bytes (sizeof) 
{/*0x000*/     UINT16       Flags;/*0x002*/     UINT16       Length;/*0x004*/     ULONG32      TimeStamp;/*0x008*/     struct _STRING DosPath;             // 3 elements, 0x10 bytes (sizeof) 
}RTL_DRIVE_LETTER_CURDIR, *PRTL_DRIVE_LETTER_CURDIR;typedef enum _SYSTEM_DLL_TYPE  // 7 elements, 0x4 bytes
{PsNativeSystemDll = 0 /*0x0*/,PsWowX86SystemDll = 1 /*0x1*/,PsWowArm32SystemDll = 2 /*0x2*/,PsWowAmd64SystemDll = 3 /*0x3*/,PsWowChpeX86SystemDll = 4 /*0x4*/,PsVsmEnclaveRuntimeDll = 5 /*0x5*/,PsSystemDllTotalTypes = 6 /*0x6*/
}SYSTEM_DLL_TYPE, *PSYSTEM_DLL_TYPE;typedef struct _EWOW64PROCESS        // 3 elements, 0x10 bytes (sizeof) 
{/*0x000*/     VOID*        Peb;/*0x008*/     UINT16       Machine;/*0x00A*/     UINT8        _PADDING0_[0x2];/*0x00C*/     enum _SYSTEM_DLL_TYPE NtdllType;
}EWOW64PROCESS, *PEWOW64PROCESS;typedef struct _RTL_USER_PROCESS_PARAMETERS                // 37 elements, 0x440 bytes (sizeof) 
{/*0x000*/     ULONG32      MaximumLength;/*0x004*/     ULONG32      Length;/*0x008*/     ULONG32      Flags;/*0x00C*/     ULONG32      DebugFlags;/*0x010*/     VOID*        ConsoleHandle;/*0x018*/     ULONG32      ConsoleFlags;/*0x01C*/     UINT8        _PADDING0_[0x4];/*0x020*/     VOID*        StandardInput;/*0x028*/     VOID*        StandardOutput;/*0x030*/     VOID*        StandardError;/*0x038*/     struct _CURDIR CurrentDirectory;                       // 2 elements, 0x18 bytes (sizeof)   /*0x050*/     struct _UNICODE_STRING DllPath;                        // 3 elements, 0x10 bytes (sizeof)   /*0x060*/     struct _UNICODE_STRING ImagePathName;                  // 3 elements, 0x10 bytes (sizeof)   /*0x070*/     struct _UNICODE_STRING CommandLine;                    // 3 elements, 0x10 bytes (sizeof)   /*0x080*/     VOID*        Environment;/*0x088*/     ULONG32      StartingX;/*0x08C*/     ULONG32      StartingY;/*0x090*/     ULONG32      CountX;/*0x094*/     ULONG32      CountY;/*0x098*/     ULONG32      CountCharsX;/*0x09C*/     ULONG32      CountCharsY;/*0x0A0*/     ULONG32      FillAttribute;/*0x0A4*/     ULONG32      WindowFlags;/*0x0A8*/     ULONG32      ShowWindowFlags;/*0x0AC*/     UINT8        _PADDING1_[0x4];/*0x0B0*/     struct _UNICODE_STRING WindowTitle;                    // 3 elements, 0x10 bytes (sizeof)   /*0x0C0*/     struct _UNICODE_STRING DesktopInfo;                    // 3 elements, 0x10 bytes (sizeof)   /*0x0D0*/     struct _UNICODE_STRING ShellInfo;                      // 3 elements, 0x10 bytes (sizeof)   /*0x0E0*/     struct _UNICODE_STRING RuntimeData;                    // 3 elements, 0x10 bytes (sizeof)   /*0x0F0*/     struct _RTL_DRIVE_LETTER_CURDIR CurrentDirectores[32];/*0x3F0*/     UINT64       EnvironmentSize;/*0x3F8*/     UINT64       EnvironmentVersion;/*0x400*/     VOID*        PackageDependencyData;/*0x408*/     ULONG32      ProcessGroupId;/*0x40C*/     ULONG32      LoaderThreads;/*0x410*/     struct _UNICODE_STRING RedirectionDllName;             // 3 elements, 0x10 bytes (sizeof)   /*0x420*/     struct _UNICODE_STRING HeapPartitionName;              // 3 elements, 0x10 bytes (sizeof)   /*0x430*/     UINT64*      DefaultThreadpoolCpuSetMasks;/*0x438*/     ULONG32      DefaultThreadpoolCpuSetMaskCount;/*0x43C*/     UINT8        _PADDING2_[0x4];
}RTL_USER_PROCESS_PARAMETERS, *PRTL_USER_PROCESS_PARAMETERS;typedef struct _PEB_LDR_DATA                            // 9 elements, 0x58 bytes (sizeof) 
{/*0x000*/     ULONG32      Length;/*0x004*/     UINT8        Initialized;/*0x005*/     UINT8        _PADDING0_[0x3];/*0x008*/     VOID*        SsHandle;/*0x010*/     struct _LIST_ENTRY InLoadOrderModuleList;           // 2 elements, 0x10 bytes (sizeof) /*0x020*/     struct _LIST_ENTRY InMemoryOrderModuleList;         // 2 elements, 0x10 bytes (sizeof) /*0x030*/     struct _LIST_ENTRY InInitializationOrderModuleList; // 2 elements, 0x10 bytes (sizeof) /*0x040*/     VOID*        EntryInProgress;/*0x048*/     UINT8        ShutdownInProgress;/*0x049*/     UINT8        _PADDING1_[0x7];/*0x050*/     VOID*        ShutdownThreadId;
}PEB_LDR_DATA, *PPEB_LDR_DATA;typedef struct _PEB64
{UCHAR InheritedAddressSpace;UCHAR ReadImageFileExecOptions;UCHAR BeingDebugged;UCHAR BitField;ULONG64 Mutant;ULONG64 ImageBaseAddress;PPEB_LDR_DATA Ldr;PRTL_USER_PROCESS_PARAMETERS ProcessParameters;ULONG64 SubSystemData;ULONG64 ProcessHeap;ULONG64 FastPebLock;ULONG64 AtlThunkSListPtr;ULONG64 IFEOKey;ULONG64 CrossProcessFlags;ULONG64 UserSharedInfoPtr;ULONG SystemReserved;ULONG AtlThunkSListPtr32;ULONG64 ApiSetMap;
} PEB64, *PPEB64;#pragma pack(4)
typedef struct _PEB32
{UCHAR InheritedAddressSpace;UCHAR ReadImageFileExecOptions;UCHAR BeingDebugged;UCHAR BitField;ULONG Mutant;ULONG ImageBaseAddress;ULONG Ldr;ULONG ProcessParameters;ULONG SubSystemData;ULONG ProcessHeap;ULONG FastPebLock;ULONG AtlThunkSListPtr;ULONG IFEOKey;ULONG CrossProcessFlags;ULONG UserSharedInfoPtr;ULONG SystemReserved;ULONG AtlThunkSListPtr32;ULONG ApiSetMap;
} PEB32, *PPEB32;typedef struct _PEB_LDR_DATA32
{ULONG Length;BOOLEAN Initialized;ULONG SsHandle;LIST_ENTRY32 InLoadOrderModuleList;LIST_ENTRY32 InMemoryOrderModuleList;LIST_ENTRY32 InInitializationOrderModuleList;ULONG EntryInProgress;
} PEB_LDR_DATA32, *PPEB_LDR_DATA32;typedef struct _LDR_DATA_TABLE_ENTRY32
{LIST_ENTRY32 InLoadOrderLinks;LIST_ENTRY32 InMemoryOrderModuleList;LIST_ENTRY32 InInitializationOrderModuleList;ULONG DllBase;ULONG EntryPoint;ULONG SizeOfImage;UNICODE_STRING32 FullDllName;UNICODE_STRING32 BaseDllName;ULONG Flags;USHORT LoadCount;USHORT TlsIndex;union{LIST_ENTRY32 HashLinks;ULONG SectionPointer;}u1;ULONG CheckSum;union{ULONG TimeDateStamp;ULONG LoadedImports;}u2;ULONG EntryPointActivationContext;ULONG PatchInformation;
} LDR_DATA_TABLE_ENTRY32, *PLDR_DATA_TABLE_ENTRY32;#pragma pack()

接着就来实现对PEB的获取操作，以64位为例，我们需要调用PsGetProcessPeb()这个内核函数，因为该内核函数没有被公开所以调用之前需要头部导出，该函数需要传入用户进程的EProcess结构，该结构可用PsLookupProcessByProcessId函数动态获取到，获取到以后直接KeStackAttachProcess()附加到应用层进程上，即可直接输出进程的PEB结构信息，如下代码。

#include "peb.h"
#include <ntifs.h>// 定义导出
NTKERNELAPI PVOID NTAPI PsGetProcessPeb(_In_ PEPROCESS Process);VOID UnDriver(PDRIVER_OBJECT driver)
{DbgPrint(("Uninstall Driver Is OK \n"));
}
// LyShark
NTSTATUS DriverEntry(IN PDRIVER_OBJECT Driver, PUNICODE_STRING RegistryPath)
{DbgPrint("hello lyshark \n");NTSTATUS status = STATUS_UNSUCCESSFUL;PEPROCESS eproc = NULL;KAPC_STATE kpc = { 0 };PPEB64 pPeb64 = NULL;__try{// HANDLE)4656 进程PIDstatus = PsLookupProcessByProcessId((HANDLE)4656, &eproc);// 得到64位PEBpPeb64 = (PPEB64)PsGetProcessPeb(eproc);DbgPrint("PEB64 = %p \n", pPeb64);if (pPeb64 != 0){// 验证可读性ProbeForRead(pPeb64, sizeof(PEB32), 1);// 附加进程KeStackAttachProcess(eproc, &kpc);DbgPrint("进程基地址: 0x%p \n", pPeb64->ImageBaseAddress);DbgPrint("ProcessHeap = 0x%p \n", pPeb64->ProcessHeap);DbgPrint("BeingDebugged = %d \n", pPeb64->BeingDebugged);// 脱离进程KeUnstackDetachProcess(&kpc);}}__except (EXCEPTION_EXECUTE_HANDLER){Driver->DriverUnload = UnDriver;return STATUS_SUCCESS;}Driver->DriverUnload = UnDriver;return STATUS_SUCCESS;
}

PEB64代码运行后，我们加载驱动即可看到如下结果:

而相对于64位进程来说，获取32位进程的PEB信息可以直接调用PsGetProcessWow64Process()函数得到，该函数已被导出可以任意使用，获取PEB代码如下。

#include "peb.h"
#include <ntifs.h>// 定义导出
NTKERNELAPI PVOID NTAPI PsGetProcessPeb(_In_ PEPROCESS Process);VOID UnDriver(PDRIVER_OBJECT driver)
{DbgPrint(("Uninstall Driver Is OK \n"));
}// LyShark
NTSTATUS DriverEntry(IN PDRIVER_OBJECT Driver, PUNICODE_STRING RegistryPath)
{DbgPrint("hello lyshark \n");NTSTATUS status = STATUS_UNSUCCESSFUL;PEPROCESS eproc = NULL;KAPC_STATE kpc = { 0 };PPEB32 pPeb32 = NULL;__try{// HANDLE)4656 进程PIDstatus = PsLookupProcessByProcessId((HANDLE)6164, &eproc);// 得到32位PEBpPeb32 = (PPEB32)PsGetProcessWow64Process(eproc);DbgPrint("PEB32 = %p \n", pPeb32);if (pPeb32 != 0){// 验证可读性ProbeForRead(pPeb32, sizeof(PEB32), 1);// 附加进程KeStackAttachProcess(eproc, &kpc);DbgPrint("进程基地址: 0x%p \n", pPeb32->ImageBaseAddress);DbgPrint("ProcessHeap = 0x%p \n", pPeb32->ProcessHeap);DbgPrint("BeingDebugged = %d \n", pPeb32->BeingDebugged);// 脱离进程KeUnstackDetachProcess(&kpc);}}__except (EXCEPTION_EXECUTE_HANDLER){Driver->DriverUnload = UnDriver;return STATUS_SUCCESS;}Driver->DriverUnload = UnDriver;return STATUS_SUCCESS;
}

PEB32代码运行后，我们加载驱动即可看到如下结果:

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