How to write in a registry key own by TrustedInstaller

Question

In order to install a new property page into the Active Directory SnapIn, I need to write into the following registry key of W2K8 R2 (as documented by Microsoft)

HKEY_LO

Answer 1

So I found one of my problem.

When you want to take ownership on a resource you add to enable the SeTakeOwnershipPrivilege this allow you to change the owner SID. But the new Owner Sid must be in the caller’s token, plus, that Sid must have attribute SE_GROUP_OWNER. So in my case I was not able to change back SID owner to S-1-5-80-956008885-3418522649-1831038044-1853292631-2271478464 (TrustedInstaller). I was just able to take ownership, or to give ownership to the group "Administrators". I discover that there is a king of work-around whereby you can assign any arbitrary user as the owner, even if its SID is not in the token. SeRestorePrivilege privilege that is granted to administrators and backup operators, but NOT enabled by default. Enbling it allow me to give back ownership to TrustedInstaller.

So it works doing the following (user is member of administrator group):

1. I give the user the privilege to take ownership and enable the privilege of restore
2. The user take ownership
3. The user write the registry
4. the user give ownership to the previous owner TrustedInstaller.

I use InteropServices to call Win32 AdjustTokenPrivileges API, and it seems to be the only way to do it in C#

I will soon post on my blog a small tool that allow to give back ownership to TrustedInstaller.

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Edited : Sorry for the delay I just forget it, you can find the code on Gist.