使用minifilter 双缓存机制实现透明加解密处理完整代码

很抱歉，我无法为您提供完整的代码。但是，我可以为您提供一个简单的示例，以说明如何使用minifilter双缓存机制实现透明加解密处理。

在此示例中，我们将使用minifilter驱动程序来拦截文件访问，并使用双缓存机制对文件进行加解密处理。我们将使用AES算法进行加解密，并使用Windows CryptoAPI来实现加解密过程。

以下是示例代码的主要部分：

// 定义双缓存结构体
typedef struct _DOUBLE_BUFFER {
    PVOID DataBuffer;      // 数据缓存
    ULONG DataLength;      // 数据长度
    PVOID AuxBuffer;       // 辅助缓存
    ULONG AuxLength;       // 辅助缓存长度
    ULONG TotalLength;     // 数据总长度
    CRITICAL_SECTION Lock; // 互斥锁
} DOUBLE_BUFFER, *PDOUBLE_BUFFER;

// 初始化双缓存
NTSTATUS InitializeDoubleBuffer(PDOUBLE_BUFFER pBuffer, ULONG TotalLength)
{
    NTSTATUS status = STATUS_SUCCESS;

    pBuffer->DataBuffer = ExAllocatePoolWithTag(NonPagedPool, TotalLength, 'Tag1');
    if (pBuffer->DataBuffer == NULL) {
        status = STATUS_INSUFFICIENT_RESOURCES;
        goto Exit;
    }
    pBuffer->DataLength = 0;

    pBuffer->AuxBuffer = ExAllocatePoolWithTag(NonPagedPool, TotalLength, 'Tag2');
    if (pBuffer->AuxBuffer == NULL) {
        status = STATUS_INSUFFICIENT_RESOURCES;
        goto Exit;
    }
    pBuffer->AuxLength = 0;

    pBuffer->TotalLength = TotalLength;

    InitializeCriticalSection(&pBuffer->Lock);

Exit:
    if (!NT_SUCCESS(status)) {
        if (pBuffer->DataBuffer != NULL) {
            ExFreePoolWithTag(pBuffer->DataBuffer, 'Tag1');
        }
        if (pBuffer->AuxBuffer != NULL) {
            ExFreePoolWithTag(pBuffer->AuxBuffer, 'Tag2');
        }
    }
    return status;
}

// 销毁双缓存
VOID DestroyDoubleBuffer(PDOUBLE_BUFFER pBuffer)
{
    if (pBuffer->DataBuffer != NULL) {
        ExFreePoolWithTag(pBuffer->DataBuffer, 'Tag1');
    }
    if (pBuffer->AuxBuffer != NULL) {
        ExFreePoolWithTag(pBuffer->AuxBuffer, 'Tag2');
    }
    DeleteCriticalSection(&pBuffer->Lock);
}

// 读取文件到缓存
NTSTATUS ReadFileToBuffer(PFLT_CALLBACK_DATA Data, PFLT_RELATED_OBJECTS FltObjects, PVOID* pBuffer, PULONG pLength)
{
    NTSTATUS status = STATUS_SUCCESS;
    HANDLE hFile = NULL;
    OBJECT_ATTRIBUTES objAttr;
    IO_STATUS_BLOCK ioStatus;
    FILE_STANDARD_INFORMATION fileInfo;
    LARGE_INTEGER byteOffset;
    ULONG length = 0;
    ULONG bytesRead = 0;

    InitializeObjectAttributes(&objAttr, &Data->Iopb->TargetFileObject->FileName, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);

    status = FltCreateFile(FltObjects->Instance, FltObjects->FileObject, &hFile, FILE_READ_DATA, &objAttr, &ioStatus, NULL, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_READ, FILE_OPEN, FILE_NON_DIRECTORY_FILE, NULL, 0, IO_IGNORE_SHARE_ACCESS_CHECK);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    status = ZwQueryInformationFile(hFile, &ioStatus, &fileInfo, sizeof(fileInfo), FileStandardInformation);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    length = (ULONG)fileInfo.EndOfFile.QuadPart;

    *pBuffer = ExAllocatePoolWithTag(NonPagedPool, length, 'Tag3');
    if (*pBuffer == NULL) {
        status = STATUS_INSUFFICIENT_RESOURCES;
        goto Exit;
    }

    byteOffset.QuadPart = 0;
    status = ZwReadFile(hFile, NULL, NULL, NULL, &ioStatus, *pBuffer, length, &byteOffset, NULL);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    bytesRead = (ULONG)ioStatus.Information;
    if (bytesRead != length) {
        status = STATUS_FILE_CORRUPT_ERROR;
        goto Exit;
    }

    *pLength = length;

Exit:
    if (hFile != NULL) {
        ZwClose(hFile);
    }
    if (!NT_SUCCESS(status) && *pBuffer != NULL) {
        ExFreePoolWithTag(*pBuffer, 'Tag3');
        *pBuffer = NULL;
        *pLength = 0;
    }
    return status;
}

// 写入缓存到文件
NTSTATUS WriteBufferToFile(PFLT_CALLBACK_DATA Data, PFLT_RELATED_OBJECTS FltObjects, PVOID pBuffer, ULONG Length)
{
    NTSTATUS status = STATUS_SUCCESS;
    HANDLE hFile = NULL;
    OBJECT_ATTRIBUTES objAttr;
    IO_STATUS_BLOCK ioStatus;
    LARGE_INTEGER byteOffset;

    InitializeObjectAttributes(&objAttr, &Data->Iopb->TargetFileObject->FileName, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);

    status = FltCreateFile(FltObjects->Instance, FltObjects->FileObject, &hFile, FILE_WRITE_DATA, &objAttr, &ioStatus, NULL, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_READ | FILE_SHARE_WRITE, FILE_OPEN_IF, FILE_NON_DIRECTORY_FILE, NULL, 0, IO_IGNORE_SHARE_ACCESS_CHECK);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    byteOffset.QuadPart = 0;
    status = ZwWriteFile(hFile, NULL, NULL, NULL, &ioStatus, pBuffer, Length, &byteOffset, NULL);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

Exit:
    if (hFile != NULL) {
        ZwClose(hFile);
    }
    return status;
}

// AES加密
NTSTATUS EncryptData(PVOID pData, ULONG Length, PVOID pKey, ULONG KeyLength)
{
    NTSTATUS status = STATUS_SUCCESS;
    HCRYPTPROV hProv = 0;
    HCRYPTKEY hKey = 0;
    ULONG blockSize = 0;
    ULONG bufferLength = 0;
    PVOID pBuffer = NULL;

    // 获取加密算法的块大小
    if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }
    if (!CryptCreateHash(hProv, CALG_SHA_256, 0, 0, NULL, NULL)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }
    if (!CryptDeriveKey(hProv, CALG_AES_256, NULL, 0, &hKey)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }
    if (!CryptGetKeyParam(hKey, KP_BLOCKLEN, (PBYTE)&blockSize, &bufferLength, 0)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }

    // 分配缓存
    bufferLength = ROUND_UP(Length, blockSize);
    pBuffer = ExAllocatePoolWithTag(NonPagedPool, bufferLength, 'Tag4');
    if (pBuffer == NULL) {
        status = STATUS_INSUFFICIENT_RESOURCES;
        goto Exit;
    }
    RtlZeroMemory(pBuffer, bufferLength);
    RtlCopyMemory(pBuffer, pData, Length);

    // 加密数据
    if (!CryptEncrypt(hKey, NULL, TRUE, 0, (PBYTE)pBuffer, &Length, bufferLength)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }

    RtlCopyMemory(pData, pBuffer, Length);

Exit:
    if (hKey != 0) {
        CryptDestroyKey(hKey);
    }
    if (hProv != 0) {
        CryptReleaseContext(hProv, 0);
    }
    if (pBuffer != NULL) {
        ExFreePoolWithTag(pBuffer, 'Tag4');
    }
    return status;
}

// AES解密
NTSTATUS DecryptData(PVOID pData, ULONG Length, PVOID pKey, ULONG KeyLength)
{
    NTSTATUS status = STATUS_SUCCESS;
    HCRYPTPROV hProv = 0;
    HCRYPTKEY hKey = 0;
    ULONG blockSize = 0;
    ULONG bufferLength = 0;
    PVOID pBuffer = NULL;

    // 获取解密算法的块大小
    if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }
    if (!CryptCreateHash(hProv, CALG_SHA_256, 0, 0, NULL, NULL)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }
    if (!CryptDeriveKey(hProv, CALG_AES_256, NULL, 0, &hKey)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }
    if (!CryptGetKeyParam(hKey, KP_BLOCKLEN, (PBYTE)&blockSize, &bufferLength, 0)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }

    // 分配缓存
    bufferLength = ROUND_UP(Length, blockSize);
    pBuffer = ExAllocatePoolWithTag(NonPagedPool, bufferLength, 'Tag5');
    if (pBuffer == NULL) {
        status = STATUS_INSUFFICIENT_RESOURCES;
        goto Exit;
    }
    RtlZeroMemory(pBuffer, bufferLength);
    RtlCopyMemory(pBuffer, pData, Length);

    // 解密数据
    if (!CryptDecrypt(hKey, NULL, TRUE, 0, (PBYTE)pBuffer, &Length)) {
        status = STATUS_INTERNAL_ERROR;
        goto Exit;
    }

    RtlCopyMemory(pData, pBuffer, Length);

Exit:
    if (hKey != 0) {
        CryptDestroyKey(hKey);
    }
    if (hProv != 0) {
        CryptReleaseContext(hProv, 0);
    }
    if (pBuffer != NULL) {
        ExFreePoolWithTag(pBuffer, 'Tag5');
    }
    return status;
}

// 处理文件读取操作
FLT_PREOP_CALLBACK_STATUS PreReadCallback(PFLT_CALLBACK_DATA Data, PCFLT_RELATED_OBJECTS FltObjects, PVOID* CompletionContext)
{
    NTSTATUS status = STATUS_SUCCESS;
    PFILE_OBJECT pFileObject = FltObjects->FileObject;
    PVOID pBuffer = NULL;
    ULONG length = 0;
    PDOUBLE_BUFFER pDoubleBuffer = NULL;

    // 检查文件对象是否是普通文件
    if ((pFileObject->Flags & FO_STREAM_FILE) != 0) {
        goto Exit;
    }

    // 检查文件大小是否超过双缓存的总长度
    if (pFileObject->SectionObjectPointer->FileSize.QuadPart > MAX_DOUBLE_BUFFER_LENGTH) {
        goto Exit;
    }

    // 创建双缓存
    pDoubleBuffer = ExAllocatePoolWithTag(NonPagedPool, sizeof(DOUBLE_BUFFER), 'Tag6');
    if (pDoubleBuffer == NULL) {
        status = STATUS_INSUFFICIENT_RESOURCES;
        goto Exit;
    }
    status = InitializeDoubleBuffer(pDoubleBuffer, (ULONG)pFileObject->SectionObjectPointer->FileSize.QuadPart);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    // 读取文件到缓存
    status = ReadFileToBuffer(Data, FltObjects, &pDoubleBuffer->DataBuffer, &pDoubleBuffer->DataLength);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    // 复制数据到辅助缓存
    EnterCriticalSection(&pDoubleBuffer->Lock);
    RtlCopyMemory(pDoubleBuffer->AuxBuffer, pDoubleBuffer->DataBuffer, pDoubleBuffer->DataLength);
    pDoubleBuffer->AuxLength = pDoubleBuffer->DataLength;
    LeaveCriticalSection(&pDoubleBuffer->Lock);

    // 加密缓存中的数据
    status = EncryptData(pDoubleBuffer->DataBuffer, pDoubleBuffer->DataLength, g_Key, g_KeyLength);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    // 将双缓存设置为完成上下文
    *CompletionContext = pDoubleBuffer;

Exit:
    if (!NT_SUCCESS(status)) {
        if (pDoubleBuffer != NULL) {
            DestroyDoubleBuffer(pDoubleBuffer);
            ExFreePoolWithTag(pDoubleBuffer, 'Tag6');
        }
        Data->IoStatus.Status = status;
        return FLT_PREOP_COMPLETE;
    }

    return FLT_PREOP_SYNCHRONIZE;
}

// 处理文件写入操作
FLT_POSTOP_CALLBACK_STATUS PostWriteCallback(PFLT_CALLBACK_DATA Data, PCFLT_RELATED_OBJECTS FltObjects, PVOID CompletionContext, FLT_POST_OPERATION_FLAGS Flags)
{
    NTSTATUS status = STATUS_SUCCESS;
    PFILE_OBJECT pFileObject = FltObjects->FileObject;
    PDOUBLE_BUFFER pDoubleBuffer = (PDOUBLE_BUFFER)CompletionContext;

    // 检查文件对象是否是普通文件
    if ((pFileObject->Flags & FO_STREAM_FILE) != 0) {
        goto Exit;
    }

    // 复制数据到辅助缓存
    EnterCriticalSection(&pDoubleBuffer->Lock);
    RtlCopyMemory(pDoubleBuffer->AuxBuffer, pDoubleBuffer->DataBuffer, pDoubleBuffer->DataLength);
    pDoubleBuffer->AuxLength = pDoubleBuffer->DataLength;
    LeaveCriticalSection(&pDoubleBuffer->Lock);

    // 解密辅助缓存中的数据
    status = DecryptData(pDoubleBuffer->AuxBuffer, pDoubleBuffer->AuxLength, g_Key, g_KeyLength);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    // 写入缓存到文件
    status = WriteBufferToFile(Data, FltObjects, pDoubleBuffer->AuxBuffer, pDoubleBuffer->AuxLength);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

Exit:
    if (pDoubleBuffer != NULL) {
        DestroyDoubleBuffer(pDoubleBuffer);
        ExFreePoolWithTag(pDoubleBuffer, 'Tag6');
    }
    Data->IoStatus.Status = status;
    return FLT_POSTOP_FINISHED_PROCESSING;
}

// 注册minifilter回调
FLT_PREOP_CALLBACK_STATUS PreOperationCallback(PFLT_CALLBACK_DATA Data, PCFLT_RELATED_OBJECTS FltObjects, PVOID* CompletionContext)
{
    switch (Data->Iopb->MajorFunction) {
    case IRP_MJ_READ:
        return PreReadCallback(Data, FltObjects, CompletionContext);
    default:
        return FLT_PREOP_SUCCESS_WITH_CALLBACK;
    }
}

FLT_POSTOP_CALLBACK_STATUS PostOperationCallback(PFLT_CALLBACK_DATA Data, PCFLT_RELATED_OBJECTS FltObjects, PVOID CompletionContext, FLT_POST_OPERATION_FLAGS Flags)
{
    switch (Data->Iopb->MajorFunction) {
    case IRP_MJ_WRITE:
        return PostWriteCallback(Data, FltObjects, CompletionContext, Flags);
    default:
        return FLT_POSTOP_FINISHED_PROCESSING;
    }
}

// 注册minifilter驱动程序
NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath)
{
    NTSTATUS status = STATUS_SUCCESS;
    PFLT_FILTER pFilter = NULL;
    OBJECT_ATTRIBUTES objAttr;
    UNICODE_STRING uniString;

    // 初始化互斥锁
    InitializeCriticalSection(&g_Lock);

    // 初始化加密密钥
    RtlInitUnicodeString(&uniString, L"Password");
    status = BCryptGenerateSymmetricKey(&g_hKey, &g_Algorithm, NULL, 0, (PUCHAR)uniString.Buffer, uniString.Length, 0);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    // 创建过滤器
    RtlInitUnicodeString(&uniString, L"FileEncryptionFilter");
    InitializeObjectAttributes(&objAttr, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);

    status = FltCreateFilter(&g_FilterHandle, FLT_REGISTRATION_VERSION, &g_FilterRegistration, &g_FilterContext, &pFilter);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    // 注册回调函数
    status = FltRegisterFilter(pFilter, DriverObject, &uniString, &g_FilterHandle);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

    status = FltStartFiltering(pFilter);
    if (!NT_SUCCESS(status)) {
        goto Exit;
    }

Exit:
    if (!NT_SUCCESS(status)) {
        if (g_hKey != NULL) {
            BCryptDestroyKey(g_hKey);
            g_hKey = NULL;
        }
        if (pFilter != NULL) {
            FltUnregisterFilter(pFilter);
        }
        if (g_FilterHandle != NULL) {
            FltClose(g_FilterHandle);
        }
        DeleteCriticalSection(&g_Lock);
    }

    return status;
}

// 卸载minifilter驱动程序
VOID DriverUnload(PDRIVER_OBJECT DriverObject)
{
    PFLT_FILTER pFilter = NULL;

    if (g_FilterHandle != NULL) {
        FltGetFilterFromInstance(g_FilterHandle, &pFilter);
        FltStopFiltering(pFilter);
        FltUnregisterFilter(pFilter);
        FltClose(g_FilterHandle);
    }

    if (g_hKey != NULL) {
        BCryptDestroyKey(g_hKey);
        g_hKey = NULL;
    }

    DeleteCriticalSection(&g_Lock);
}

这只是一个简单的示例，实际实现中可能需要更多的代码来处理各种情况和错误。此外，请注意，此示例仅用于演示目的，并且未经过完整测试或优化，因此可能存在问题。