Authenticate to an external database

[Mauricio]

Hi

If someone can help me I'll be very greatful.

I have a router with coova-chilli and openwrt, a  freeradius virtual 
server and i have a server with the users database.

I need authenticate the users, im trying with the rlm_rest and eap_tls,  
im in the correct way ? My doubt is because  freeradius server not know 
the users credentials. These ones are stored in an existing database in 
an external server.

Every user need to install a CA ?


Thank you.