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Modifying Registry Security

Posted on 1997-08-07
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Last Modified: 2012-06-21
I am writing an app in vc 5.0 which will update a NT 4.0 registry key. The registry key has Administrator as the owner, SYSTEM has FULL CONTROL and everyone has READ access.  
I looked at RegSetSecurityKey but could not figure out how to get ownership privilege to update the key. This application will be run by Administrator. Please elaborate your answer.
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Question by:mnyeu
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Author Comment

by:mnyeu
ID: 1166965
Edited text of question
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Author Comment

by:mnyeu
ID: 1166966
Adjusted points to 200
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Expert Comment

by:craven080297
ID: 1166967
Hello,
first you have to be conscious that you need at least a "sight" on the registry key, in order to get its handle, using, as usual the RegOpenKeyEx(YOUR_ROOT, "Key Name", 0, WRITE_OWNER, &hKey) command. This will return handle in hKey.
You then have to call RegSetSecurityKey(hKey, OWNER_SECURITY_INFORMATION, &Descript). Descript is a PSECURITY_DESCRIPTOR object, initialized via InitializeSecurityDescriptor() and SetSecurityDescriptorOwner().
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Author Comment

by:mnyeu
ID: 1166968
Well, I have tried that before.  The problem was I could not open the key with WRITE_OWNER options although I have administrative privilege. That is core of the problem. It is a reg key to which SYSTEM has FULL CONTROL and EVERYONE have READ access. The question is how to open it with WRITE_OWNER option? If you can
anwser this question, you get the points.
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Expert Comment

by:craven080297
ID: 1166969
Wel, I have a few ideas, such as SetSecurityDescriptorDacl() and ~Owner(), after having called AdjustTokenPrivileges() using SE_PRIVILEGE_ENABLED and so on, halas I do not manage to get denied access on any element of my own registry :-S
If you see what I mean just try it, it should allow you to get WRITE_OWNER even if not allowed. It seems AdjustTokenPrivileges() should do the job...
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Accepted Solution

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craven080297 earned 200 total points
ID: 1166970
Er, let me add this: correct syntax for AdjustTokenPrivileges() sould be:
AdjustTokenPrivileges(tokHandle, FALSE, &tokPriv, sizeof( tokPriv ), NULL, NULL );
Getting topPriv value:
LookupPrivilegeValue( NULL, "SeTakeOwnershipPrivilege", &ownValue); then filling in TOKEN_PRIVILEGES struct called topPriv.
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Author Comment

by:mnyeu
ID: 1166971
I have found out that even if you can open a registry with WRITE_OWNER privilege, you can not modify it.  You need to have KEY_WRITE access, and I could not find out how.  However, I have promised to give you full point for WRITE_OWNER privilege. So you have it. Thanks anyway.
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