Network Information System (NIS) with Openstack Keystone

Is there any way through which Network Information System (NIS) could be integrated with Openstack Keystone? Please let me know if you know any online resource.

Solution

Found the answer on Openstack Keystone v3 documentation. We can extent authentication support in keystone in following three ways:

Configure Openstack keystone with Apache server and handover authentication part to Apache
Write middileware in Openstack keystone
Extend Openstack keystone functionality by writing authentication plugin

http://docs.openstack.org/developer/python-keystoneclient/authentication-plugins.html#authentication-plugins

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