* sec_auth.cc (get_user_groups): Mark well-known groups as well-known.

(get_user_local_groups): Ditto.
	(verify_token): Drop useless label.
	* sec_helper.cc (cygsid::get_sid): Check for well-known SID if
	well_known isn't set.
	* security.h (well_known_sid_type): New inline function.

winsup/cygwin/security.h

@@ -1,7 +1,7 @@
 /* security.h: security declarations
 
    Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
-   2010 Red Hat, Inc.
+   2010, 2011 Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -339,6 +339,12 @@ extern cygpsid well_known_samba_unix_user_fake_sid;
 
 bool privilege_luid (const PWCHAR pname, LUID *luid);
 
+inline BOOL
+well_known_sid_type (SID_NAME_USE type)
+{
+  return type == SidTypeAlias || type == SidTypeWellKnownGroup;
+}
+
 inline BOOL
 legal_sid_type (SID_NAME_USE type)
 {