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Date: Sat, 03 Nov 2007 00:27:28 -0700
From: Brian Dessent <brian AT dessent DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: detecting elevation of a process running in bash in vista
References: <loom DOT 20071103T000657-49 AT post DOT gmane DOT org>
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Kurt Franke wrote:

> does anyone found a methode to detect if a bash process
> is running so-called "elevated" with cygwin on windows vista ?
> it would be a nice feature setting the prompt to a value
> reflecting this like done when running as root under an unix os.
> or to modify the windows title to reflect the fact that
> the shell is running with special privileges.

You can use something like the attached program.  It will simply return
an exit status code so that in your shell startup you can e.g.:

if isadmin; then
	title="[Admin]"
else
	title=""
fi
PS1='\[\e]0;$title\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$ '

Note that w32api currently lacks the CheckTokenMembership() prototype so
you'll need to apply
<http://sourceforge.net/tracker/index.php?func=detail&aid=1825044&group_id=2435&atid=302435>
first in order to build this.

Brian
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 filename="isadmin.c"

#include <stdio.h>
#define _WIN32_WINNT 0x0500
#include <windows.h>

int main (int argc, char **argv)
{
  SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
  PSID AdministratorsGroup;
  BOOL isAdmin;

  if (AllocateAndInitializeSid (&NtAuthority, 2,
          SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,
          0, 0, 0, 0, 0, 0, &AdministratorsGroup) == 0 ||
      CheckTokenMembership (NULL, AdministratorsGroup, &isAdmin) == 0)
    {
      printf ("failed with win32 error %lu\n", GetLastError ());
      exit (2);
    }

  FreeSid (AdministratorsGroup);
  exit (!isAdmin);
}


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