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Nova integration to enroll IPA clients

Project description

novajoin Package
==================

This Python package provides a dynamic vendordata plugin for the OpenStack
nova metadata service to manage host instantiation in an IPA server.

It consists of two services:

- REST service
- notification listener

The REST service will respond to dynamic requests from the nova metadata
server. This is used to add hosts into IPA.

The notification listener will handle instance delete requests and remove
the appropriate host from IPA as well as floating IP associate and
disassociate requests and update IPA DNS.

Build
=====

In this directory, run:

python setup.py build


Installation
============

In this directory, run:

python setup.py install


Package Requirements
====================

Beyond those packages normally installed by Openstack, these are also
required:

{free}ipa-python


Configuration
=============

The machine running the novajoin service needs to be enrolled
as an IPA client.

Run novajoin-install to install and configure the plugin on a
pre-installed nova server.

nova currently needs to be manually configured to enable the
novajoin REST service and enable notifications in
/etc/nova/nova.conf:

vendordata_providers = StaticJSON, DynamicJSON
vendordata_dynamic_targets = 'join@http://127.0.0.1:9999/v1/'
vendordata_dynamic_connect_timeout = 5
vendordata_dynamic_read_timeout = 30
vendordata_jsonfile_path = /etc/nova/cloud-config.json

notification_driver = messaging
notification_topic = notifications
notify_on_state_change = vm_state


Pre-requisites
--------------

Cloud-init 0.7.6+ is required to retreive dynamic metadata when
config_drive is True.

You will need the IPA admin password, or an account that can
add privileges, permissions, roles and can retrieve keytabs.

You will need to provide Openstack credentails in the environment
so that the glance metadata upload can occur.

This will:

- copy the cloud-init and enrollment script to /etc/nova
- obtain a keytab to be used to authenticate against IPA when
doing host management
- call out to a script to create the requisite permissions and
role in IPA
- add the IPA metadata to the glance metadata service

The nova-api service will need to be manually restarted.

The installer takes the following options:

--hostname: use this value as the FQDN of the server.
--user: user that the nova service runs as. This is needed to
set filesystem permissions
--principal: the user used to configure IPA integration: create permissions,
get the keytab, etc. Default is the IPA admin account.
--password: the password for the principal. If this is not set the the
password is obtained interactively
--password-file: the file containing the password for the principal.


Metadata REST Service Configuration
===================================

The REST service is configured in /etc/join/join.conf in the DEFAULT
section. It provides the following options:

join_listen_port: The TCP port to listen on. Defaults to 9999.
api_paste_config: The paste configuration file to use.
debug: Enable additional debugging output. Default is False.
auth_strategy: The authentication strategy to use
url: The JSON RPC URL to an IPA server, e.g. https://ipa.host.domain/ipa/json
keytab: The Kerberos keytab containing the credentails for the user
nova will use to manage hosts. The default is /etc/krb5.keytab.
domain: The domain to associate with IPA hosts.
connect_retries: The number of times to attempt to contact the IPA
server before failing.
project_subdomain: Use the project the instance is created in as the
subddomain for the fully-qualified domain name. For example if
the project is admin and the domain is example.com and the
instance name is test the FQDN will be test.admin.example.com
normalize_project: A project name can contain values not allowed as a
DNS label. This will convert invalid values to a dash (-)
dropping leading and trailing dashes.


Usage
=====

Sample usage from the command-line:

$ openstack server create --flavor m1.tiny --image cirros-0.3.4-x86_64-uec test --property ipa_enroll=True
$ ssh <IP>
$ curl http://169.254.169.254/openstack/2016-10-06/vendor_data2.json

The curl output will include a "join" element in the returned dict.
Thsi will contain a hostname and ipaotp value. These are used for
enrollment with ipa-client-install via:

# ipa-client-install -U -w <ipaotp> --hostname <hostname>


Logging
=======

The REST novajoin-server service logs by default to
/var/log/novajoin/novajoin-server.log

The notification listener service novajoin-notify logs by default to
/var/log/novajoin/novajoin-notify.log

A logrotate script for this is:

/var/log/novajoin/*log {
weekly
rotate 14
size 10M
missingok
compress
}


Design
======

There are quite a few moving parts in novajoin so here is a high-level
overview of how it fits together.

The OpenStack Newton release added a new type of metadata to the nova
metadata service: dynamic metadata. This is metadata generated on-the-fly
and not stored within nova (for example for security reasons).

For the case of enrolling a client into IPA using a One-Time Password (OTP)
the password needs to be generated when the IPA host created and then
somehow passed to the instance. This is done using dynamic metadata.

The basic sequence of events is:

1. Instance creation is requested to nova, either via Horizon or the
command-line.
2. nova starts the instance and pushes down a cloud-init script provided
by novajoin.
3. cloud-init executes the provided script which installs the ipa-client
package, then executes a script which retrieves the metadata from the
nova metadata service[*]. This looks like:
% curl http://169.254.169.254/openstack/2016-10-06/vendor_data2.json
4. This request invokes the novajoin dynamic metadata service provided
by the novajoin package. This is registered in /etc/nova/nova.conf.
5. If the instance was created with the property ipa_enroll=True or
the host image has this property set then a host in IPA is created and
an OTP generated. The OTP and generated FQDN are returned to nova as a
python dictionary. The data is returned from the metadata service as
JSON. If the glance image has os_distro and os_version set in its
metadata then this will be reflected in the IPA host.
6. The script provided to cloud-init pulls out the OTP and FQDN and calls
ipa-client-install

This results in an IPA-enrolled client with no user interaction.

The novajoin-notify service waits for notifications from nova that an
instance deletion has been completed. If that instance or image has the
property ipa_enroll=True then the host is removed from IPA.

*In the case of config drive the metadata is retrieved and attached
to the instance at boot time. cloud-init detects the config drive and
reads its metadata from there.


Origin
======

This builds on the work of Rich Megginson and Nathan Kinder. Rich
did the initial hooks implementation visible at
https://github.com/richm/rdo-vm-factory/blob/master/rdo-ipa-nova

Copyright and License
=====================

Copyright 2016 Red Hat, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.

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