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梦见你的名字 发表于 2023-6-7 10:43:33

驱动开发：PE导出函数与RVA转换

在笔者上篇文章《驱动开发：内核扫描SSDT挂钩状态》中简单介绍了如何扫描被挂钩的SSDT函数，并简单介绍了如何解析导出表，本章将继续延申PE导出表的解析，实现一系列灵活的解析如通过传入函数名解析出函数的RVA偏移，ID索引，Index下标等参数，并将其封装为可直接使用的函数，以在后期需要时可以被直接引用，同样为了节约篇幅本章中的LoadKernelFile()内存映射函数如需要使用请去前一篇文章中自行摘取。
首先实现GetRvaFromModuleName()函数，当用户传入参数后自动将函数名解析为对应的RVA偏移或Index下标索引值，该函数接收三个参数传递，分别是wzFileName模块名，FunctionName所在模块内的函数名，Flag标志参数，函数输出ULONG64类型的数据。
// 署名权
// right to sign one's name on a piece of work
// PowerBy: LyShark
// Email: me@lyshark.com

// 从指定模块中得到特定函数的RVA或相对序号相对偏移
ULONG64 GetRvaFromModuleName(WCHAR *wzFileName, UCHAR *FunctionName, INT Flag)
{
        // 加载内核模块
        PVOID BaseAddress = LoadKernelFile(wzFileName);

        // 取出导出表
        PIMAGE_DOS_HEADER pDosHeader;
        PIMAGE_NT_HEADERS pNtHeaders;
        PIMAGE_SECTION_HEADER pSectionHeader;
        ULONGLONG FileOffset;
        PIMAGE_EXPORT_DIRECTORY pExportDirectory;

        // DLL内存数据转成DOS头结构
        pDosHeader = (PIMAGE_DOS_HEADER)BaseAddress;

        // 取出PE头结构
        pNtHeaders = (PIMAGE_NT_HEADERS)((ULONGLONG)BaseAddress + pDosHeader->e_lfanew);

        // 判断PE头导出表是否为空
        if (pNtHeaders->OptionalHeader.DataDirectory.VirtualAddress == 0)
        {
                return 0;
        }

        // 取出导出表偏移
        FileOffset = pNtHeaders->OptionalHeader.DataDirectory.VirtualAddress;

        // 取出节头结构
        pSectionHeader = (PIMAGE_SECTION_HEADER)((ULONGLONG)pNtHeaders + sizeof(IMAGE_NT_HEADERS));
        PIMAGE_SECTION_HEADER pOldSectionHeader = pSectionHeader;

        // 遍历节结构进行地址运算
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }

        // 导出表地址
        pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)((ULONGLONG)BaseAddress + FileOffset);

        // 取出导出表函数地址
        PULONG AddressOfFunctions;
        FileOffset = pExportDirectory->AddressOfFunctions;

        // 遍历节结构进行地址运算
        pSectionHeader = pOldSectionHeader;
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }
        AddressOfFunctions = (PULONG)((ULONGLONG)BaseAddress + FileOffset);

        // 取出导出表函数名字
        PUSHORT AddressOfNameOrdinals;
        FileOffset = pExportDirectory->AddressOfNameOrdinals;

        // 遍历节结构进行地址运算
        pSectionHeader = pOldSectionHeader;
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }
        AddressOfNameOrdinals = (PUSHORT)((ULONGLONG)BaseAddress + FileOffset);

        // 取出导出表函数序号
        PULONG AddressOfNames;
        FileOffset = pExportDirectory->AddressOfNames;

        // 遍历节结构进行地址运算
        pSectionHeader = pOldSectionHeader;
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }
        AddressOfNames = (PULONG)((ULONGLONG)BaseAddress + FileOffset);

        // 分析导出表
        ULONG uOffset;
        LPSTR FunName;
        ULONG uAddressOfNames;
        ULONG TargetOff = 0;

        for (ULONG uIndex = 0; uIndex < pExportDirectory->NumberOfNames; uIndex++, AddressOfNames++, AddressOfNameOrdinals++)
        {
                uAddressOfNames = *AddressOfNames;
                pSectionHeader = pOldSectionHeader;
                for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
                {
                        if (pSectionHeader->VirtualAddress <= uAddressOfNames && uAddressOfNames <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                        {
                                uOffset = uAddressOfNames - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                        }
                }
                FunName = (LPSTR)((ULONGLONG)BaseAddress + uOffset);

                // 如果找到则返回RVA
                if (!_stricmp((const char *)FunctionName, FunName))
                {
                        // 等于1则返回RVA
                        if (Flag == 1)
                        {
                                TargetOff = (ULONG)AddressOfFunctions[*AddressOfNameOrdinals];
                                // DbgPrint("索引 [ %p ] 函数名 [ %s ] 相对RVA [ %p ] \n", *AddressOfNameOrdinals, FunName, TargetOff);
                                return TargetOff;
                        }
                        // 返回索引
                        else if (Flag == 0)
                        {
                                return *AddressOfNameOrdinals;
                        }
                }
        }

        // 结束后释放内存
        ExFreePoolWithTag(BaseAddress, (ULONG)"LyShark");
        return 0;
}调用该函数很容易，传入模块路径以及该模块内的函数名，解析出RVA地址或Index下标。
NTSTATUS DriverEntry(IN PDRIVER_OBJECT Driver, PUNICODE_STRING RegistryPath)
{
        // 函数分别传入 [模块路径,函数名,标志=1] 返回该导出函数的RVA
        ULONG64 get_rva = GetRvaFromModuleName(L"\\SystemRoot\\system32\\ntoskrnl.exe", "NtReadFile", 1);
        DbgPrint("NtReadFile RVA = %p \n", get_rva);

        // 函数分别传入 [模块路径,函数名,标志=0] 返回该导出函数的ID下标
        ULONG64 get_id = GetRvaFromModuleName(L"\\SystemRoot\\system32\\ntoskrnl.exe", "NtReadFile", 0);
        DbgPrint("NtReadFile ID = %d \n", get_id);

        Driver->DriverUnload = UnDriver;
        return STATUS_SUCCESS;
}编译并运行程序，分别获取到ntoskrnl.exe模块内NtReadFile函数的RVA,Index索引，调用效果如下；
https://img2023.cnblogs.com/blog/1379525/202302/1379525-20230225132154268-651960902.png
第二个函数GetModuleNameFromRVA()则实现传入RVA或者函数Index序号，解析出函数名，具体实现方法与如上函数基本一致，仅仅只是在过滤时做了调整。
// 署名权
// right to sign one's name on a piece of work
// PowerBy: LyShark
// Email: me@lyshark.com

// 根据传入的函数RVA或Index下标，获取该函数的函数名
PCHAR GetModuleNameFromRVA(WCHAR *wzFileName, ULONG64 uRVA, INT Flag)
{
        // 加载内核模块
        PVOID BaseAddress = LoadKernelFile(wzFileName);

        // 取出导出表
        PIMAGE_DOS_HEADER pDosHeader;
        PIMAGE_NT_HEADERS pNtHeaders;
        PIMAGE_SECTION_HEADER pSectionHeader;
        ULONGLONG FileOffset;
        PIMAGE_EXPORT_DIRECTORY pExportDirectory;

        // DLL内存数据转成DOS头结构
        pDosHeader = (PIMAGE_DOS_HEADER)BaseAddress;

        // 取出PE头结构
        pNtHeaders = (PIMAGE_NT_HEADERS)((ULONGLONG)BaseAddress + pDosHeader->e_lfanew);

        // 判断PE头导出表是否为空
        if (pNtHeaders->OptionalHeader.DataDirectory.VirtualAddress == 0)
        {
                return 0;
        }

        // 取出导出表偏移
        FileOffset = pNtHeaders->OptionalHeader.DataDirectory.VirtualAddress;

        // 取出节头结构
        pSectionHeader = (PIMAGE_SECTION_HEADER)((ULONGLONG)pNtHeaders + sizeof(IMAGE_NT_HEADERS));
        PIMAGE_SECTION_HEADER pOldSectionHeader = pSectionHeader;

        // 遍历节结构进行地址运算
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }

        // 导出表地址
        pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)((ULONGLONG)BaseAddress + FileOffset);

        // 取出导出表函数地址
        PULONG AddressOfFunctions;
        FileOffset = pExportDirectory->AddressOfFunctions;

        // 遍历节结构进行地址运算
        pSectionHeader = pOldSectionHeader;
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }
        AddressOfFunctions = (PULONG)((ULONGLONG)BaseAddress + FileOffset);

        // 取出导出表函数名字
        PUSHORT AddressOfNameOrdinals;
        FileOffset = pExportDirectory->AddressOfNameOrdinals;

        // 遍历节结构进行地址运算
        pSectionHeader = pOldSectionHeader;
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }
        AddressOfNameOrdinals = (PUSHORT)((ULONGLONG)BaseAddress + FileOffset);

        // 取出导出表函数序号
        PULONG AddressOfNames;
        FileOffset = pExportDirectory->AddressOfNames;

        // 遍历节结构进行地址运算
        pSectionHeader = pOldSectionHeader;
        for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
        {
                if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                {
                        FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                }
        }
        AddressOfNames = (PULONG)((ULONGLONG)BaseAddress + FileOffset);

        // 分析导出表
        ULONG uOffset;
        LPSTR FunName;
        ULONG uAddressOfNames;
        ULONG TargetOff = 0;

        for (ULONG uIndex = 0; uIndex < pExportDirectory->NumberOfNames; uIndex++, AddressOfNames++, AddressOfNameOrdinals++)
        {
                uAddressOfNames = *AddressOfNames;
                pSectionHeader = pOldSectionHeader;
                for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
                {
                        if (pSectionHeader->VirtualAddress <= uAddressOfNames && uAddressOfNames <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
                        {
                                uOffset = uAddressOfNames - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
                        }
                }

                FunName = (LPSTR)((ULONGLONG)BaseAddress + uOffset);
                TargetOff = (ULONG)AddressOfFunctions[*AddressOfNameOrdinals];

                // 等于1则通过RVA返回函数名
                if (Flag == 1)
                {
                        if (uRVA == TargetOff)
                        {
                                return FunName;
                        }
                }
                // 返回索引
                else if (Flag == 0)
                {
                        if (uRVA == *AddressOfNameOrdinals)
                        {
                                return FunName;
                        }
                }
        }

        // 结束后释放内存
        ExFreePoolWithTag(BaseAddress, (ULONG)"LyShark");
        return "None";
}调用GetModuleNameFromRVA()并传入相应的RVA偏移或Index下标。
NTSTATUS DriverEntry(IN PDRIVER_OBJECT Driver, PUNICODE_STRING RegistryPath)
{
        DbgPrint("hello lyshark.com \n");

        PCHAR function_name;

        // 传入函数RVA得到函数名
        function_name = GetModuleNameFromRVA(L"\\SystemRoot\\system32\\ntoskrnl.exe", 0x5e5220, 1);
        DbgPrint("根据RVA得到函数名 = %s \n", function_name);

        // 传入函数下标得到函数名
        function_name = GetModuleNameFromRVA(L"\\SystemRoot\\system32\\ntoskrnl.exe", 1472, 0);
        DbgPrint("根据Index得到函数名 = %s \n", function_name);

        Driver->DriverUnload = UnDriver;
        return STATUS_SUCCESS;
}编译并运行程序，调用后分别获取到RVA=0x5e5220或Index=1472的函数名；
https://img2023.cnblogs.com/blog/1379525/202302/1379525-20230225133740581-1096285888.png

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