Squid Single Sign on Authentication with kerberos

HI, Firstly thanks for reading. I've just setup a squid server on a 10.5 server and it works perfectly using the squid_ldap_auth module. I can authenticate against our 10.6 Open Directory server with no problems and can even block users form internet access etc. So since every user has to login to a machine I thought it would make more sense to use the kerberos ticket they already have. Unfortunately I've hit a brick wall....hard. I can find no documentation on the web (apart from Active Directory integration) about setting up Squid to use the squid_kerb_auth with OS X kerberos. I know very little about kerberos but from what I understand I need to create a principal for my server running squid and then export a local keytab file for squid to be able to access the KDC's password store. Any help would be greatly appreciated as I could do with this setup as soon as possible really. Thanks Dave Maltby