[pptp-server] a question about pap-secrets file

[Dani Arbel]

Hi!
I have a pptp server installed and operating ok. The authentication is
done using RADIUS server:
in /etc/ppp/options I have added the login option
I have installed PAM module for RADIUS authentication (pam_radius_auth.so)
in /etc/ppp/pap-secrets i have:

# Secrets for authentication using PAP
# client	server	secret			IP addresses
*               pop       ""                           *

My question: is there a way to bypass the need to have an /etc/passwd
entry for each user that will have to use the vpn ? 

Thanks,
Dani