asked on

Checking if user is root or normal user for linux

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

monir

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.

thegetta

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;

monir

thegetta stole the code from JEDI Code Library !!!!

itektas

ASKER

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"

itektas

ASKER

i have briefly tried it and it doesnt seem to work, i am using delphi under linux not windows?

itektas

ASKER

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.

:(

ASKER CERTIFIED SOLUTION

PashaMod

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