Does anyone have the answer...

I was having dinner with a very nice young couple last week.

They explained to me that their pastor, via a letter, has informed them that children cannot received confirmation unless they are attending the local Catholic elementary school (associated with the parish) or the CCD program associated with that parish. Even if they are attending another Catholic school, they must attend the CCD program.

Does anyone know if this is something a pastor can demand/require for Confirmation in "his" parish? Is he overstepping his authority?