Solved

Set Write Permissions for a Group - VB.NET

Posted on 2009-07-02
2
339 Views
Last Modified: 2013-11-26
Hi Experts Exchange!

I'm trying to do something that seems pretty simple to me, however, after a couple hours of research I can't seem to find exactly what I need.

I'm creating an xml file, to store some settings, in the [My.Computer.FileSystem.SpecialDirectories.AllUsersApplicationData] directory of windows.  The file is created without any problems, however, the "Users" group is only given Read & Excecute permissions to the file.  So, when another user runs my program and attempts to modify the the .xml file, a security permissions error is thrown.  

Here's what I need to do...
I need to change the file's permissions for the "Users" group, and allow write access to the .xml file.  I'd also like to do this immediately after the file's creation.

Just an FYI; this in no way creates any security threat for my application.  Not only is my .xml file encrypted, but the settings stored inside the .xml file are of an inconsequential nature.  It's encrypted simply for the peace of mind associated with basic security through obfuscation.

That's pretty straight forward right?  I'm sure plenty of you guys have changed windows security permissions at the group level before.

A note...I did try assigning the attribute <PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> to my methods, however this was not successful.

If you have any questions, please feel free to ask away!

Much thanks!   =)
0
Comment
Question by:OFGemini
2 Comments
 
LVL 41

Accepted Solution

by:
graye earned 500 total points
ID: 24807667
Here is an example of doing precisely that...
You'd use it like this:
Imports System.Security.AccessControl
            Dim domainSid As New Security.Principal.SecurityIdentifier("S-1-0-0")
            Dim Users As New Security.Principal.SecurityIdentifier(Security.Principal.WellKnownSidType.BuiltinUsersSid, domainSid)
            AddFileSecurity(wp_file, Users, FileSystemRights.Modify, AccessControlType.Allow)

Imports System.Security.AccessControl
Imports System.Security.Principal
 
    '
    ' Adds an ACL entry on the specified file for the specified account.
    '
    Public Sub AddFileSecurity(ByVal fileName As String, ByVal account As SecurityIdentifier, ByVal rights As FileSystemRights, ByVal controlType As AccessControlType)
        ' Get a FileSecurity object that represents the current security settings.
        Dim fSecurity As FileSecurity = File.GetAccessControl(fileName)
 
        ' Create a new rule
        Dim accessRule As New FileSystemAccessRule(account, rights, controlType)
 
        ' Add the FileSystemAccessRule to the security settings. 
        fSecurity.AddAccessRule(accessRule)
 
        ' Set the new access settings.
        File.SetAccessControl(fileName, fSecurity)
    End Sub

Open in new window

0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This document covers how to connect to SQL Server and browse its contents.  It is meant for those new to Visual Studio and/or working with Microsoft SQL Server.  It is not a guide to building SQL Server database connections in your code.  This is mo…
The ECB site provides FX rates for major currencies since its inception in 1999 in the form of an XML feed. The files have the following format (reducted for brevity) (CODE) There are three files available HERE (http://www.ecb.europa.eu/stats/exch…
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

860 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question