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Programmatically find the computer SID with C# and CPP

Posted on 2009-04-01
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Last Modified: 2012-05-06
In need 2 routines, one in cpp and the other in C#. The code shows the cpp code to get the SID for the computer. I think this is correct, I have been using it for awhile. Then I need to be able to do the same thing in C#. Neither program will have administrative rights.

When I run these 2 code snipits on a computer on a domain I get the domain SID for the computer. I can verify this with ADSIViewer. Same results for both! Good, half way there.

If I then move the code to a machine that is not on a domain the CPP code will return a SID. But the .net C# code always throws no matter what computer name I give it.

This can't be that hard. So if someone has some ideas....


Scott
//
//	Get the size of the buffers
//
  cbSid        = 0;
  cbDomainName = 0;
  Sid          = NULL;
  LookupAccountName( NULL, szAccount, Sid, &cbSid, pszDomainName, &cbDomainName,  &eUse );
//
//	Now get the actual SID
//	
  Sid           = (PSID)  malloc(cbSid);
   pszDomainName = (LPSTR) malloc(cbDomainName);
 
   bRC = LookupAccountName( NULL, szAccount, Sid, &cbSid, pszDomainName   , &cbDomainName, &eUse ); 
  if( bRC )
  {
    strcpy_s( m_szDomainName, sizeof(m_szDomainName), pszDomainName );   	
    bRC = ConvertSidToStringSid( Sid, &pszSid ); 
    if( bRC )
   {
     sprintf_s( szWork, sizeof(szWork), "       FQDN : %s\\%s   - SID_NAME_USE: %li",     m_szDomainName,  m_szComputerName, eUse);
  printf( "%s\r\n", szWork ); 			
  strcpy_s( m_szMachineSID, sizeof(m_szMachineSID), pszSid );
  printf( "  MachineSID: %s\r\n", m_szMachineSID );    			
  if (pszSid)	LocalFree( pszSid );
 }
 }
 
==================================  C#  ===============================
	String sSid;
	SecurityIdentifier sid, sid2;
	NTAccount nta, acct;
	try
	{
		nta = new NTAccount( "SNORBERG-T5400$" );	
	
		sid = (SecurityIdentifier) nta.Translate( typeof(SecurityIdentifier));
		sSid = m_Config.MachineSID;
		sid2 = new SecurityIdentifier( sSid + "-513");
	
		acct = (NTAccount)sid.Translate(typeof(NTAccount));	
		acct = (NTAccount)sid2.Translate(typeof(NTAccount));
	}
	catch( Exception ex )
	{
		MessageBox.Show( ex.Message );
	}

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Question by:snorberg
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Accepted Solution

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snorberg earned 0 total points
ID: 24049461
It seems that the only way this can be done from .net code is by using the win32 api commands through the runtime.interopServices.
http://www.pinvoke.net/default.aspx/advapi32.LookupAccountName
The pinvoke site has a reasonable example.
 
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