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Keystone uses plugin oriented authentication,you can enable external auth method by modifying the keystone.conf as the config guide shows http://docs.openstack.org/havana/config-reference/content/ch_configuring-openstack-identity.html#keystone-token-binding

Keystone can also use Kerberos as external auth method as the following config shows

[token]
    bind = kerberos

Hope that helps!

Vic