.net - Encountering a FileSystemRights value that isn't defined in enumeration

Question

I've written an application that examines all of the file system permissions on a directory.

A directory has a number of access rules (of type FileSystemAccessRule).

Each access rule has a property FileSystemRights, which is a flag enumeration.

When running this, I keep encountering a FileSystemRights value of 268435456 (which comes to 0x10000000 in hexadecimal).

This value just doesn't appear in enumeration! It's actually higher than the highest single flag value (Synchronize, having a value of 0x100000).

Does anyone know what this is?

Answer 1

See http://cjwdev.wordpress.com/2011/06/28/permissions-not-included-in-net-accessrule-filesystemrights-enum/

From that page:

Using .NET you may think that determining which permissions are assigned to a directory/file should be quite easy, as there is a FileSystemRights Enum defined that seems to contain every possible permission that a file/directory can have and calling AccessRule.FileSystemRights returns a combination of these values. However, you will soon come across some permissions where the value in this property does not match any of the values in the FileSystemRights Enum (I do wish they wouldn’t name some properties with the same name as a Type but hey).

The end result of this is that for some files/directories you simply cannot determine which permissions are assigned to them. If you do AccessRule.FileSystemRights.ToString then for these values all you see is a number rather than a description (e.g Modify, Delete, FullControl etc). Common numbers you might see are:

-1610612736, –536805376, and 268435456

To work out what these permissions actually are, you need to look at which bits are set when you treat that number as 32 separate bits rather than as an Integer (as Integers are 32 bits long), and compare them to this diagram: http://msdn.microsoft.com/en-us/library/aa374896(v=vs.85).aspx

So for example, -1610612736 has the first bit and the third bit set, which means it is GENERIC_READ combined with GENERIC_EXECUTE. So now you can convert these generic permissions into the specific file system permissions that they correspond to.

You can see which permissions each generic permission maps to here: http://msdn.microsoft.com/en-us/library/aa364399.aspx. Just be aware that STANDARD_RIGHTS_READ, STANDARD_RIGHTS_EXECUTE and STANDARD_RIGHTS_WRITE are all the same thing (no idea why, seems strange to me) and actually all equal the FileSystemRights.ReadPermissions value.