EAP-TLS with check on DB possible?

[Stefano Zanmarchi]

Hi,
a newbie question before I start setting up Freeradius  with EAP-TLS.
Is it possible to configure Freeradius to make a double check when it
receives an authentication request?
I'd like it not only to check if  the client certificate is valid but also
if the user is in a DB "authorized_users" table.
Thank you very much for your indications,
Stefano