Windows File System Filter Driver Development Tutorial112

Introduction

Windows file system filter drivers allow you to intercept and modify file system operations in the kernel mode, providing a powerful mechanism for implementing advanced file system functionality and monitoring. This tutorial will guide you through the development of a simple file system filter driver in Windows.

Prerequisites
Visual Studio 2019 or later
Windows Driver Kit (WDK)
Basic understanding of C/C++ and kernel programming

Creating a New Driver Project
Open Visual Studio and create a new project.
Select "Windows Driver" as the project type and "KMDF (Kernel Mode Driver Framework)" as the template.
Enter a driver name, such as "MyFilterDriver".
Set the minimum supported Windows version to Windows 10.

Implementing the Filter Driver
In the "Source Files" folder, open the file "MyFilterDriver.c".
Include the necessary header files and define the driver entry point, `DriverEntry`.
Implement the `FilterFsdPreOperationCallback` and `FilterFsdPostOperationCallback` functions to intercept pre- and post-file system operations.
In these callbacks, you can perform various operations, such as modifying file attributes, logging operations, or blocking access to certain files.
Register the filter driver with the file system by calling `FltRegisterFilter` in `DriverEntry`.

Example Filter Driver Code```c++
NTSTATUS FilterFsdPreOperationCallback(PFLT_CALLBACK_DATA Data, PCFLT_RELATED_OBJECTS FltObjects, PVOID CompletionContext)
{
// Intercept the file system operation here
// ...
return STATUS_SUCCESS;
}
NTSTATUS FilterFsdPostOperationCallback(PFLT_CALLBACK_DATA Data, PCFLT_RELATED_OBJECTS FltObjects, PVOID CompletionContext)
{
// Perform post-operation operations here
// ...
return STATUS_SUCCESS;
}
```

Building and Installing the Driver
Build the driver solution in Visual Studio.
Open an elevated Command Prompt.
Navigate to the output directory of the driver build.
Run the following command to install the driver:
```
sc create MyFilterDriver bin\amd64\ type= kernel
```
Start the driver by running:
```
sc start MyFilterDriver
```

Testing the Filter Driver
Create a test file in the file system.
Use a file monitoring tool, such as Process Monitor, to observe the file system operations.
Verify that the filter driver is intercepting the file system operations and performing the desired modifications.

Conclusion

Developing a Windows file system filter driver provides you with the ability to customize and enhance file system functionality. This tutorial has covered the basics of developing a simple filter driver, but the concepts and techniques can be applied to more complex scenarios. By understanding the inner workings of the file system, you can create powerful solutions for monitoring, security, and file system performance optimization.

2025-02-01

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