Anyone know of a good minifilter that allows file access control?

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I've been trying to find a good minifilter example but it's not going well 8(

I am looking for a simple minifilter skeleton that doesn't do much but allow registering of events from managed code in VS 2013, then forwards the File-System event to the application (which handles all the logic) and waits for a reply.
I am particularly interested in file access control which generates an event and allows my c# application to tell it whether to allow/block access to certain files.

Anybody know of a good source/example where I can find this functionality?

PS
...and yes it has to be free 8-

Posted 13-Feb-15 1:31am

thorssig

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Kuthuparakkal 13-Feb-15 7:52am

If you are not interested to go that deep like File Allocation level, then you may create a windows service and that spawns WMI events (for file access) and deny access based on your criteria

thorssig 13-Feb-15 8:23am

That's the thing, I want to stay away from the nitty gritty details of filing systems as much as I can and focus on access control (allow/deny). I understand that minifilters allow this but I find it hard to find a working example.
The only minifilters that I've found that allow this costs around $2000! 8-

BillWoodruff 13-Feb-15 10:25am

This "minifilter" would run on a server and limit the read/writes of users to files on the server ? Or ?

thorssig 13-Feb-15 12:59pm

It would just run on a local computer, although I would also have to anticipate network access. It would then allow/deny access to files based on access rules.
I guess the info I need the filter to forward to the managed code is file name, accessing program and perhaps user & computer.

BillWoodruff 13-Feb-15 14:51pm

What you require cannot be handled using Windows' System facilities for regulating access, i.e., Roles/Groups/Permission ? There are ways to lock a file using C#, but they are "hairy" code. Are you familiar with 'FileSystemWatcher in .NET: with that you can observe, but you can't control.

thorssig 13-Feb-15 21:23pm

I'm pretty sure its possible. I've been reading about anti-virus programs using minifilters to control access to files, but I haven't found a good example.

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