I'm attempting to use freeradius to authenticate wireless network in my organisation, using self-signed certificates. 

I have installed freeradius 2.1.10 from debian 6 repository, set up basic configuration according to instructions on freeradius.org site, finally I've configured freeradius to use mysql.

It seems to work properly, but i wonder if it is safe to keep user password and client secret in plaintext? I searched the lists and googled a bit, but I can't find any information regarding this case. 

So:

1 - is there a way (or sense) to hash shared secret in my database?

2 - Can I hash user passwords if I'm using eap-tls?

2a - if I'm using certificates for authentication, do I actually need to keep user passwords? Cause it seems that they aren't used during authentication (or I didn't find that part during debuging)

Regards

Peter