Change a File's ACL to Allow Full Access for E

Question

How do I change a file's owner to Everyone and also allow the Everyone object Full Access?

Are there any APIs available for this? Do I have to use P/Invoke?

I searched everywhere but can't find anything to do this.

Answer 1

You can use FileInfo.GetAccessControl and File.SetAccessControl methods

check the sample code given in MSDN link for File.SetAccessControl

Answer 2

Indeed, there are API's available for this. You may want to have a look at the File.SetAccessControl method in the System.IO namespace.

// Read the current ACL details for the file
var fileSecurity = File.GetAccessControl(fileName);

// Create a new rule set, based on "Everyone"
var fileAccessRule = new FileSystemAccessRule(new NTAccount("", "Everyone"),
      FileSystemRights.FullControl, 
      AccessControlType.Allow);

// Append the new rule set to the file
fileSecurity.AddAccessRule(fileAccessRule);

// And persist it to the filesystem
File.SetAccessControl(fileName, fileSecurity);

The forementioned article has tons of great things to play with, regarding the ACL.