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Windows NT Domains and Local System Account

Posted on 2003-11-23
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Last Modified: 2012-05-04
Greetings


Does anyone know how I can make a clear destinction between a user that logged into an NT domain and one that logs unto a local system account.

With my Microsoft client, I have the option to either log onto the domain or log in with a local system account.

I would like some code that will indicate whether I am on the domain or a local account.

Any pointers or samples will be greatly appreciated.

Thanks in advance.
 Engwi
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Question by:Engwi
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2 Comments
 
LVL 17

Accepted Solution

by:
geobul earned 200 total points
ID: 9809761
Hi,

There should be an environment variable USERDOMAIN that shows the domain name (or local computer name) you are currently logged on. Get it like:

function GetEnvStr(EnvName: AnsiString): AnsiString;
var
  Buffer: Array[1..256] of Char;
begin
  EnvName:='%'+EnvName+'%'+#0;
  ExpandEnvironmentStrings(@EnvName[1],@Buffer,SizeOf(Buffer));
  Result:=StrPas(@Buffer);
  if (Result+#0=EnvName) then Result:='';
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(GetEnvStr('USERDOMAIN'));
end;

Regards, Geo
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LVL 17

Expert Comment

by:Wim ten Brink
ID: 9810388
The best way would be by using GetTokenInformation to get the user token and then use LookupAccountSid to convert the token to a username/domain name pair. Something like:

var
  hAccessToken: THandle;
  UserToken: PSIDAndAttributes;
  InfoBufferSize: DWORD;
  dwInfoBufferSize: DWORD;
  vName, vDomain: PChar;
  cbName, cbDomain: DWORD;
  peUse: SID_NAME_USE;
begin
  if OpenThreadToken(GetCurrentThread, TOKEN_QUERY, True, hAccessToken) then begin
    UserToken := nil;
    GetTokenInformation(hAccessToken, TokenUser, UserToken, 0, InfoBufferSize);
    GetMem(UserToken, InfoBufferSize);
    if GetTokenInformation(hAccessToken, TokenUser, UserToken, InfoBufferSize, dwInfoBufferSize) then begin
      cbName := 0;
      cbDomain := 0;
      vName := nil;
      vDomain := nil;
      LookupAccountSid(nil, SID, vName, cbName, vDomain, cbDomain, peUse);
      LastError := GetLastError;
      if (LastError = ERROR_INSUFFICIENT_BUFFER) then begin
        GetMem(vName, cbName);
        GetMem(vDomain, cbDomain);
        if LookupAccountSid(nil, SID, vName, cbName, vDomain, cbDomain, peUse) then begin
        WriteLn(Log, 'User ', UserName, ' (', DisplayName, ') on domain ', Domain, '.');
      end;
    end;
  end;
end;

LookupAccountSid provides three types of information. The username and length of the username, the domain name and the length of the domain name and finally, the type of the account. Now, the domain name can be equal to the computer name, in which case it's a local account. Or it is the name of the domain.
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