pptpd+freeradius+ldap: which password encryption can I use?

[Alberto Aldrigo]

Hi Everybody,

I'm trying to setup a PPTPD server which would authenticate users using 
my openLDAP user database, in doing so I need freeradius.
By now the only setup that actually works is: users in LDAP with clear 
text password.
Obviously I want to use some kind of encryption for passwords and I 
don't like the solution of using cleartext passwords and the use of a 
specific user allowed to access to the password attribute, so my 
question is: which other possibilities I have?
Looking to this table 
http://deployingradius.com/documents/protocols/compatibility.html I 
understand that I can use pap + sha1 but I can't understand how. Can 
anyone help me understand what is possible and what not?
Many thanks

Alberto