C# Registry Permission can't Write to Registry

Posted on 2006-07-19
Medium Priority
Last Modified: 2008-12-16
I'm trying to make a program that will write to a particular registry Key that "Everybody" doesn't have full control over.

Here's the basic Gyst of the code:
RegistryKey key2 = Registry.LocalMachine.OpenSubKey("SYSTEM\\CurrentControlSet\\Enum\\FTDIBUS\\VID_0403+PID_6001+5&138461b1&0&1\\0000", true);

This particular key inherits its security settings from the Enum Key.

If I run the same line without the true on the end, it goes past this line, but hangs whenever I try to write to the key.

I can successfully write to other keys/values with no problem.

Here's the kicker. If I go into RegEdit, I can set the permissions manually so that Everyone has Full Access to this key,  the program works without a hitch.

Currently only SYSTEM has Full Access.

I plan on deploying this to many computers, so I need a way for the program to Change the Permissions for that Key. I'm assuming if the person running the program has Admin Access, then I should be able to accomplish this.

I have tried inserting:
[assembly: RegistryPermissionAttribute(SecurityAction.RequestMinimum, Write=@"HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Enum")]

at the beginning, but that doesn't do anything.

I've fooled with with RegistryAccessRules, and I've made a Rule that will accomplish what I want, but I have no earthly idea how to apply that rule to the registry key if it isn't open in write mode (true at the end);

I would greatly appreciate any help at all with this.
Question by:Darren Kattan
LVL 96

Accepted Solution

Bob Learned earned 1000 total points
ID: 17141470
Your program cannot take control of the registry, it has to be granted control to write to the registry.

What exactly do you need to change with this apparent PCI device entry?  Is there an API interface that can change this without having to hack the registry?


Assisted Solution

NewMom2Brandon earned 1000 total points
ID: 17156189
OpenSubKey opens it as read only.

using System;
// it's required for reading/writing into the registry:
using Microsoft.Win32;      
using System.Windows.Forms;

public bool Write(string KeyName, object Value)
        // Setting
        RegistryKey rk = baseRegistryKey ;
        // I have to use CreateSubKey
        // (create or open it if already exits),
        // 'cause OpenSubKey open a subKey as read-only
        RegistryKey sk1 = rk.CreateSubKey(subKey);
        // Save the value
        sk1.SetValue(KeyName.ToUpper(), Value);

        return true;
    catch (Exception e)
        ShowErrorMessage(e, "Writing registry " + KeyName.ToUpper());
        return false;

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