How do I check if my program is ran by user as administrator (Vista/Win7, C++) [duplicate]

Question

I saw IsInRole method but I can't find information on how to use it with C++.

Answer 1

There's a C++ code snippet in this old answer taken from the UACHelpers project on CodePlex.

Answer 2

This code solves your problem. Feel free to use it. It works with SE_GROUP_USE_FOR_DENY_ONLY.

/**
  IsGroupMember determines if the current thread or process has a token that contais a given and enabled user group. 

  Parameters
   dwRelativeID: Defines a relative ID (par of a SID) of a user group (e.g. Administrators DOMAIN_ALIAS_RID_ADMINS (544) = S-1-5-32-544)
   bProcessRelative: Defines whether to use the process token (TRUE) instead of the thread token (FALSE). If FALSE and no thread token is present
     the process token will be used though.
   bIsMember: Returns the result of the function. The value returns TRUE if the user is an enabled member of the group; otherwise FALSE.

  Return Value
    If the function succeeds, the return value is TRUE; otherwise FALSE. Call GetLastError for more information.
*/
BOOL IsGroupMember(DWORD dwRelativeID, BOOL bProcessRelative, BOOL* pIsMember)
{
    HANDLE hToken, hDupToken;
    PSID pSid = NULL;
    SID_IDENTIFIER_AUTHORITY SidAuthority = SECURITY_NT_AUTHORITY;

    if (!pIsMember)
    {
        SetLastError(ERROR_INVALID_USER_BUFFER);
        return FALSE;
    }

    if (bProcessRelative || !OpenThreadToken(GetCurrentThread(), TOKEN_QUERY | TOKEN_DUPLICATE, TRUE, &hToken))
    {
        if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_DUPLICATE, &hToken))
        {
            return FALSE;
        }
    }

    if (!DuplicateToken(hToken, SecurityIdentification, &hDupToken))
    {
        CloseHandle(hToken);
        return FALSE;
    }

    CloseHandle(hToken);
    hToken = hDupToken;

    if (!AllocateAndInitializeSid(&SidAuthority, 2,
            SECURITY_BUILTIN_DOMAIN_RID, dwRelativeID, 0, 0, 0, 0, 0, 0,
            &pSid))
    {
        CloseHandle(hToken);
        return FALSE;
    }

    if (!CheckTokenMembership(hToken, pSid, pIsMember))
    {
        CloseHandle(hToken);
        FreeSid(pSid);

        *pIsMember = FALSE;
        return FALSE;
    }

    CloseHandle(hToken);
    FreeSid(pSid);

    return TRUE;
}

BOOL IsUserAdministrator(BOOL* pIsAdmin)
{
    return IsGroupMember(DOMAIN_ALIAS_RID_ADMINS, FALSE, pIsAdmin);
}

Answer 3

The documentation of IsUSerAnAdmin explains that it's deprecated since Vista, but points you to CheckTokenMembership. That should do the job for you.