[rsbac] Linux public key authentication an PKI

[sftf at yandex.ru]

Hi!
Anybody now, is there project/drafts for Linux implementing
centralized public key authentication for various services (not only SSH) and client software?
Scenario:
- admin create private/public keys (like for SSH), one per user and store them in LDAP
- ALL(POP3,SMTP,FTP,WEB,SAMBA and so on) services authenticate users by public key,
  not by the password
- so client software (POP3,SMTP,FTP... clinets) use public key instead password
Thanks!