auth from ldap

hi,
is there any way not to register each user regualry but auth from ldap. 
my biggest need for a ticketing system where each user authenticate 
itself from a list of any other way without have to choose an own 
username. I'd like if all of our user would have one login name for all 
kind of system. otherwise each user choose a different username 
everywhere and login names goes to a big chaos.
thanks in advance.

--
  Levente                               "Si vis pacem para bellum!"




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