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NT/95 Registry:  I can't read/write to the registry in my code when the NT/95 system is locked down or the user doesn't have admin rights

Posted on 1998-10-01
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Last Modified: 2010-04-01
I am making updates to the system registry but when the 95/NT system I am testing on is locked down or the user I am logged in as doesn't have adminstrative rights I get a fatal error stating that I cannot access the registry.  Does anyone know of a workaround for this?  Are there areas in the registry that cannot be read or written to if the system is locked down or the user doesn't have administrative rights?
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Question by:afalvey
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3 Comments
 

Author Comment

by:afalvey
ID: 1174152
Bye the way.  The code is written in VC++ 5.0 and we are using the following APIs for accessing the system registry:

RegOpenKey
RegEnumVal
RegCloseKey
RegQueryValueEx
RegQueryInfoKey
RegSetValueEx
RegFlushKey
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jhance earned 400 total points
ID: 1174153
Under NT, each registry key can have protections set.  When you use RegOpenKeyEx, the samDesired parameter to the function specified what type of access to the key you want.  (Under Win9X, this parameter is ignored)  If you don't have rights to this key you will get an error returned from the function.  There is no workaround, this is the way NT is designed.  You either need to relax the security on the keys in question or logon to the system with an account having the correct privileges.
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Expert Comment

by:tsollas
ID: 1174154
jhance is not entirely correct.  You can get around this, but you'll have to use impersonation.  It basically looks like this:

HANDLE hToken;
LogonUser( szUser, szDomain, szPassword, LOGON32_LOGON_BATCH,                  LOGON32_PROVIDER_DEFAULT, &hToken ););
ImpersonateLoggedOnUser( hToken );

// do stuff

CloseHandle( hToken );
RevertToSelf();

What this does is a) log on as a specific user.  You'll want to log in as a user with sufficient rights and then b) tells your current thread to "impersonate" the token of the logged in user.  The user logged in needs to have the SE_TCB_NAME privilege enabled.  This means, of course, you'll have to either prompt the user for an appropriate user account, or you'll have to store that somewhere so you can use it behind the scenes.

Supposedly there's a way to impersonate explorer (if I recall, its security context is the system account), and I think it involves getting Explorer's process token and impersonating that, but I haven't tried it.
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