[Swan] user access control ?

[Glenn Pierce]

Hi so I have setup libreswan which is working fine.
I have users that can connect to the vpn using the Shrew Soft client
(XAUTH / RSA a.k.a "Cisco IPsec mode")

I am using xauthby=file for users

At the moment users can access a number of private networks. ie

rightsubnets=10.253.175.48/29,10.76.1.128/28,10.179.32.0/24,10.139.0.0/24,10.132.54.0/24,10.76.16.0/24


Is there a way to specify networks or ip addresses a particular user
can access ?

Thanks