Intercepting file operations (Madshi?)
Posted on 2003-11-18
Short question: How can I prevent the user from deleting a file (system wide)?
More elaborate question: This is for a program that's going to be used in kiosk mode (lan house, etc). There's an interface which limits the programs that the user can open, and he can't use alt+tab or ctrl+alt+del or the Windows key. However, the user can just open any available program (Internet Explorer, the Office suite) that has a file open/save menu and he will have access to the explorer shell (enough access to move stuff around and delete files). What I want to do is to intercept file operations (especially deletion) and deny the action. I tried doing this with hooks (DeleteFileA, DeleteFileW, SHFileOperation), but it didn't work. Works fine for programs, but the explorer shell can still delete the files.
The intended platform is Windows XP, but in the future I'd like to make it work with Win98 also, so setting user permissions doesn't seem like a very good idea.