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# Overview
[Keystone][keystone-upstream] is the identity service used by OpenStack for
authentication and high-level authorisation.
The keystone-kerberos subordinate charm allows for per-domain authentication
via a Kerberos ticket, thereby providing an additional layer of security. It is
used in conjunction with the [keystone][keystone-charm] charm.
An external Kerberos server is a prerequisite.
> **Note**: The keystone-kerberos charm is supported starting with OpenStack
> **Warning**: This charm is in a preview state and should not be used in
production. See the [OpenStack Charm Guide][cg-preview-charms] for more
information on preview charms.
# Usage
# Configuration
This section covers common and/or important configuration options. See file
`config.yaml` for the full list of options, along with their descriptions and
default values. See the [Juju documentation][juju-docs-config-apps] for details
on configuring applications.
#### `kerberos-realm`
The `kerberos-realm` option is used to supply the external Kerberos realm name.
#### `kerberos-server`
The `kerberos-server` option is used to supply the external Kerberos server
#### `kerberos-domain`
The `kerberos-domain` option is the OpenStack domain against which Kerberos
authentication should be used.
## Deployment
Let file ``kerberos.yaml`` contain the deployment configuration:
kerberos-realm: "PROJECT.SERVERSTACK"
kerberos-server: "freeipa.project.serverstack"
kerberos-domain: "k8s"
Deploy keystone-kerberos with other essential applications:
juju deploy keystone
juju deploy openstack-dashboard
juju deploy --config kerberos.yaml --resource=/home/ubuntu/keystone.keytab keystone-kerberos
juju add-relation keystone openstack-dashboard
juju add-relation keystone keystone-kerberos
See the next section for retrieving the keytab file. It can also be added to
the application post-deploy:
juju attach-resource keystone-kerberos keystone_keytab=keystone.keytab
## Kerberos pre-requisites - the Keystone service keytab
In an external Kerberos server, a service must be created for the Keystone
1. First determine the FQDN of the Keystone server. For example:
Ensure that the Keystone server can resolve the Kerberos server hostname. If
it can't, consider adding an entry to `/etc/hosts`.
1. In the Kerberos server, create the host and service. This example is based
on a FreeIPA Kerberos server:
ipa host-add keystone-server.project.serverstack --ip-adress=
ipa service-add HTTP/keystone-server.project.serverstack
ipa service-add-host HTTP/keystone-server.project.serverstack --hosts=keystone-server.project.serverstack
If you have multiple Keystone servers, you should add each host to the
ipa host-add-principal keystone-server HTTP/<keystone-other-hostname>@PROJECT.SERVERSTACK
1. Retrieve the keytab associated with this service:
ipa-getkeytab -p HTTP/keystone-server.project.serverstack -k keystone.keytab
## Authenticate from a host
The below steps show how to authenticate from a host using the `openstack` CLI
1. Ensure that the following software is installed on the host:
sudo apt install krb5-user python3-openstackclient python3-requests-kerberos
1. Retrieve a token for an existing user in the Kerberos/LDAP directory.
kinit <username>
1. Source the OpenStack rc file.
source k8s-user.rc
Where the contents of `k8s-user.rc` is:
export OS_AUTH_URL=http://kerberos-server.project.serverstack:5000/krb/v3
export OS_PROJECT_ID=<projectID>
export OS_PROJECT_NAME=<kerberos_domain> # i.e k8s
export OS_PROJECT_DOMAIN_ID=<domainID>
export OS_REGION_NAME="RegionOne"
export OS_INTERFACE=public
export OS_AUTH_TYPE=v3kerberos
1. Test the client
openstack token issue
# Bugs
Please report bugs on [Launchpad][lp-bugs-charm-keystone-kerberos].
For general charm questions refer to the [OpenStack Charm Guide][cg].
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