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Checking if user is root or normal user for linux

Posted on 2003-11-28
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Last Modified: 2010-04-05
hi

I am building an application which i only want the root users to be able to use, so that if a normal user attempts to run the program they are not allowed in. I am guessing that I have to use If/else to check if the user is root,  so that if they arent i can display a message something like  Showmessage('You must be under root to run this application');  . Is this possible? thanks in advance

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Question by:itektas
7 Comments
 
LVL 2

Expert Comment

by:monir
ID: 9843026

Simply use the function (IsAdministrator)

function IsAdministrator: Boolean;

You can find this function at JclSecurity unit from Project JEDI Code Library (JCL).

JCL library can be found at:
http://projectjedi.sourceforge.net/

This library is free and come with full source code!!

Monir.
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Expert Comment

by:thegetta
ID: 9843638
Begin
       If IsAdministrator = False Then
       Begin
               showmessage('error');
               exit;
         end;

End;

function IsAdministrator: Boolean;
var
  psidAdmin: Pointer;
  Token: THandle;
  Count: DWORD;
  TokenInfo: PTokenGroups;
  HaveToken: Boolean;
  I: Integer;
begin
  Result := False;
  psidAdmin := nil;
  TokenInfo := nil;
  HaveToken := False;
  try
    HaveToken := OpenThreadToken(GetCurrentThread, TOKEN_QUERY, True, Token);
    if (not HaveToken) and (GetLastError = ERROR_NO_TOKEN) then
      HaveToken := OpenProcessToken(GetCurrentProcess, TOKEN_QUERY, Token);
    if HaveToken then
    begin
      Win32Check(AllocateAndInitializeSid(SECURITY_NT_AUTHORITY, 2,
        SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0,
        psidAdmin));
      if GetTokenInformation(Token, TokenGroups, nil, 0, Count) or
       (GetLastError <> ERROR_INSUFFICIENT_BUFFER) then
         RaiseLastOSError;
      TokenInfo := PTokenGroups(AllocMem(Count));
      Win32Check(GetTokenInformation(Token, TokenGroups, TokenInfo, Count, Count));
      for I := 0 to TokenInfo^.GroupCount - 1 do
      begin
        {$RANGECHECKS OFF} // Groups is an array [0..0] of TSIDAndAttributes, ignore ERangeError
        Result := EqualSid(psidAdmin, TokenInfo^.Groups[I].Sid);
        {$IFDEF RANGECHECKS_ON}
        {$RANGECHECKS ON}
        {$ENDIF RANGECHECKS_ON}
        if Result then
          Break;
      end;
    end;
  finally
    if TokenInfo <> nil then
      FreeMem(TokenInfo);
    if HaveToken then
      CloseHandle(Token);
    if psidAdmin <> nil then
      FreeSid(psidAdmin);
  end;
end;
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LVL 2

Expert Comment

by:monir
ID: 9844767


 thegetta stole the code from JEDI Code Library !!!!
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Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

Author Comment

by:itektas
ID: 9845335
I can not find it on the website actually, when i go to the link "jedi code library"  i can not see any links that talk about jcl security?! and isnt that code for windows? i can see lines in it where it says " win32"
0
 

Author Comment

by:itektas
ID: 9845339
i have briefly tried it and it doesnt seem to work, i am using delphi under linux not windows?
0
 

Author Comment

by:itektas
ID: 9845519
ok the code that you guys are talking about i have found the same on the borland developer support site;

http://community.borland.com/article/0,1410,26752,00.html 

but it is only for windows! when i try to use it with delphi in linux i get loads of compiler errors.

:(
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Accepted Solution

by:
PashaMod earned 0 total points
ID: 9883862
Question closed and points refunded

PashaMod
Cs Moderator
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Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

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