I'm very pleased to tell you that we now have a Kerberos authentication module thanks to Sylvain Chambon. He works at Open Wide, one of Nuxeo's Gold partners, as Senior Software Architect and Team Manager. You might recognize Open Wide as we recently did a webinar together about EasySOA, a research project Nuxeo and Open Wide have in common.
This feature has been asked for many times by many different people. The Jira tickets go back to 2007. As you can see it's been a long time :) If you are not familiar with Kerberos, here's a definition taken straight from the MIT page:
Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography. A free implementation of this protocol is available from the Massachusetts Institute of Technology. Kerberos is available in many commercial products as well.
A Nuxeo Marketplace package is now available on the dev channel, which is to say it's only available from the update center of a 5.7-SNAPSHOT version of Nuxeo. The public Marketplace package will be released at the same time as the next 5.6 hot fix. It installs the plugin and configuration files. Be aware that it will not work as is and requires some configuration, which is quite usual with Kerberos setup. Please take a close look at our documentation.