Notes on Kerberos / LDAP authentication

This will be a scratch space for the beginning of new Kerberos & LDAP page. Initially, this will be a bunch of random notes, hopefully coalesced into a document.

Reference Documents

The main reference by Danang : Building Powerful Central Authentication

Things that can use Kerberos / LDAP to authenticate

These are the things that we would like to use our K&L auth:

• NFS4 authentication/security
• automount / autofs
• sudo
• ssh / kerberos key forwarding / ldap shared keys?
• Apache web page security
• Netgroups -- limiting logins to specific machines
• AFS -- andrew file system
• Email
• radius / 802.1x for wired and wireless networks
• Samba -- be able authenticate windows clients -- perhaps using pgina.
• Mac OS/X clients?

First setup DNS

Kerberos and to a lesser extent LDAP need to have proper DNS names. If you are using an internal network (192.168.x.y), you will need to setup a DNS for your network.

The topic of DNS is very large. I'm not going to cover it here. I should point you to some external document.

I've found that on RHEL5/CentOS5 you can use system-config-bind. The help is good. I just imported the /etc/hosts file as suggested. This worked very well!

Also, one can use DNS service records to automatically find both the kerberos KDC and the ldap server.

Setting up Kerberos

yum -y install krb5-server

edit /etc/krb5.conf edit /var/kerberos/krb5kdc/kdc.conf

/usr/kerberos/sbin/kdb5_util create -s