login fields

[shibboleth]

Hi list,

I would like to give an option to the user to either login with the username
or a special unique idnumber. At first it didn't seem a problem I can just
do something like this:

idp.authn.LDAP.userFilter = |(uid={user})(employeeNumber={user})


the problem with this approach is that there's a really tiny chance of
returning two users and since I'm trying  to migrate to shibboleth my DB
already has existing users.

So my question is what's is the best approach to give the user the option to
login with the username or the numberID?Is this possible? 

I'm going to need two Dn's right?! one for the username and other for the
numberID



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