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：
```c
// 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。
本文详细介绍了InitializeObjectAttributes宏的使用方法及其参数说明。该宏用于初始化OBJECT_ATTRIBUTES结构体，指定打开对象句柄的属性。文章涵盖了如何设置各种标志位及参数以实现不同功能。
扫一扫
1143
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
