Setting Registry key write permissions using .NET

Question

I\'m trying to grant Write access to my application\'s registry settings to everyone or all users of a machine during the install process.

My application does not

Answer 1

I realize this post is a bit old but I figured it was worth commenting on it for anyone that might stumble upon it like I did while trying to figure out a similar issue. You were very close, I just changed two lines of code. The key change is the first one; when opening the key you need to open it as writable. The second change is to append new permissions rather than replacing all permissions...since you are giving everyone full access, you don't really need this change, but if you were adding permissions for single user, you would want to append permissions.

Each change I made first comments out the old line with //CHANGED:

SecurityIdentifier sid = new SecurityIdentifier(WellKnownSidType.WorldSid, null);
NTAccount account = sid.Translate(typeof(NTAccount)) as NTAccount;

// Get ACL from Windows

// CHANGED to open the key as writable: using (RegistryKey rk = Registry.LocalMachine.OpenSubKey(key))
using (RegistryKey rk = Registry.LocalMachine.OpenSubKey(key, RegistryKeyPermissionCheck.ReadWriteSubTree))
{

        // CHANGED to add to existing security: RegistrySecurity rs = new RegistrySecurity();
    RegistrySecurity rs = rk.GetAccessControl()

    // Creating registry access rule for 'Everyone' NT account
    RegistryAccessRule rar = new RegistryAccessRule(
        account.ToString(),
        RegistryRights.FullControl,
        InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit,
        PropagationFlags.None,
        AccessControlType.Allow);

    rs.AddAccessRule(rar);
    rk.SetAccessControl(rs);
}