SmartCards, BSD and Linux?

Gilles Cherix asks: "I just come back from an IT Expo where Sun demonstrated their brand new SunRay appliances. These are cool and cute little boxes with a smart card reader ... the card is used for autentication and everything is executed from a Sparc server. I'm wondering if my favorite Open Source operating systems can do something similar: that is, if there is support for smartcard reader/writers in *BSD or Linux. The rest is a question of some coding but that would be an interesting alternative for me since I have to manage new accounts everyday and I don't want to spend very much money for Sun hardware."