145 lines
5.9 KiB
ReStructuredText
145 lines
5.9 KiB
ReStructuredText
==============
|
|
Authentication
|
|
==============
|
|
|
|
OpenStackClient leverages `python-keystoneclient`_ authentication
|
|
plugins to support a number of different authentication methods.
|
|
|
|
.. _`python-keystoneclient`: http://docs.openstack.org/developer/python-keystoneclient/authentication-plugins.html
|
|
|
|
Authentication Process
|
|
----------------------
|
|
|
|
The user provides some number of authentication credential options.
|
|
If an authentication type is not provided (``--os-auth-type``), the
|
|
authentication options are examined to determine if one of the default
|
|
types can be used. If no match is found an error is reported and OSC exits.
|
|
|
|
Note that the authentication call to the Identity service has not yet
|
|
occurred. It is deferred until the last possible moment in order to
|
|
reduce the number of unnecessary queries to the server, such as when further
|
|
processing detects an invalid command.
|
|
|
|
Authentication Plugins
|
|
----------------------
|
|
|
|
The Keystone client library implements the base set of plugins. Additional
|
|
plugins may be available from the Keystone project or other sources.
|
|
|
|
There are at least three authentication types that are always available:
|
|
|
|
* **Password**: A project, username and password are used to identify the
|
|
user. An optional domain may also be included. This is the most common
|
|
type and is the default any time a username is supplied. An authentication
|
|
URL for the Identity service is also required. [Required: ``--os-auth-url``,
|
|
``--os-project-name``, ``--os-username``; Optional: ``--os-password``]
|
|
* **Token**: This is slightly different from the usual token authentication
|
|
(described below as token/endpoint) in that a token and an authentication
|
|
URL are supplied and the plugin retrieves a new token.
|
|
[Required: ``--os-auth-url``, ``--os-token``]
|
|
* **Token/Endpoint**: This is the original token authentication (known as 'token
|
|
flow' in the early CLI documentation in the OpenStack wiki). It requires
|
|
a token and a direct endpoint that is used in the API call. The difference
|
|
from the new Token type is this token is used as-is, no call is made
|
|
to the Identity service from the client. This type is most often used to
|
|
bootstrap a Keystone server where the token is the ``admin_token`` configured
|
|
in ``keystone.conf``. It will also work with other services and a regular
|
|
scoped token such as one obtained from a ``token issue`` command.
|
|
[Required: ``--os-url``, ``--os-token``]
|
|
* **Others**: Other authentication plugins such as SAML, Kerberos, and OAuth1.0
|
|
are under development and also supported. To use them, they must be selected
|
|
by supplying the ``--os-auth-type`` option.
|
|
|
|
Detailed Process
|
|
----------------
|
|
|
|
The authentication process in OpenStackClient is all contained in and handled
|
|
by the ``ClientManager`` object.
|
|
|
|
* On import ``api.auth``:
|
|
|
|
* obtains the list of installed Keystone authentication
|
|
plugins from the ``keystoneclient.auth.plugin`` entry point.
|
|
* builds a list of authentication options from the plugins.
|
|
|
|
* The command line arguments are processed and a configuration is loaded from
|
|
:file:`clouds.yaml` if ``--os-cloud`` is provided.
|
|
|
|
* A new ``ClientManager`` is created and supplied with the set of options from the
|
|
command line, environment and/or :file:`clouds.yaml`:
|
|
|
|
* If ``--os-auth-type`` is provided and is a valid and available plugin
|
|
it is used.
|
|
* If ``--os-auth-type`` is not provided an authentication plugin
|
|
is selected based on the existing options. This is a short-circuit
|
|
evaluation, the first match wins.
|
|
|
|
* If ``--os-url`` and ``--os-token`` are both present ``token_endpoint``
|
|
is selected
|
|
* If ``--os-username`` is supplied ``password`` is selected
|
|
* If ``--os-token`` is supplied ``token`` is selected
|
|
* If no selection has been made by now exit with error
|
|
|
|
* Load the selected plugin class.
|
|
|
|
* When an operation that requires authentication is attempted ``ClientManager``
|
|
makes the actual initial request to the Identity service.
|
|
|
|
* if ``--os-auth-url`` is not supplied for any of the types except
|
|
Token/Endpoint, exit with an error.
|
|
|
|
Authenticating using Identity Server API v3
|
|
-------------------------------------------
|
|
|
|
To authenticate against an Identity Server API v3, the
|
|
``OS_IDENTITY_API_VERSION`` environment variable or
|
|
``--os-identity-api-version`` option must be changed to ``3``, instead of the
|
|
default ``2.0``. Similarly ``OS_AUTH_URL`` or ``os-auth-url`` should also be
|
|
updated.
|
|
|
|
.. code-block:: bash
|
|
|
|
$ export OS_IDENTITY_API_VERSION=3 (Defaults to 2.0)
|
|
$ export OS_AUTH_URL=http://localhost:5000/v3
|
|
|
|
Since Identity API v3 authentication is a bit more complex, there are additional
|
|
options that may be set, either as command line options or environment
|
|
variables. The most common case will be a user supplying both user name and
|
|
password, along with the project name; previously in v2.0 this would be
|
|
sufficient, but since the Identity API v3 has a ``Domain`` component, we need
|
|
to tell the client in which domain the user and project exists.
|
|
|
|
If using a user name and password to authenticate, specify either it's owning
|
|
domain name or ID.
|
|
|
|
* ``--os-user-domain-name`` or ``OS_USER_DOMAIN_NAME``
|
|
|
|
* ``--os-user-domain-id`` or ``OS_USER_DOMAIN_ID``
|
|
|
|
If using a project name as authorization scope, specify either it's owning
|
|
domain name or ID.
|
|
|
|
* ``--os-project-domain-name`` or ``OS_PROJECT_DOMAIN_NAME``
|
|
|
|
* ``--os-project-domain-id`` or ``OS_PROJECT_DOMAIN_ID``
|
|
|
|
If using a domain as authorization scope, set either it's name or ID.
|
|
|
|
* ``--os-domain-name`` or ``OS_DOMAIN_NAME``
|
|
|
|
* ``--os-domain-id`` or ``OS_DOMAIN_ID``
|
|
|
|
Note that if the user and project share the same domain, then simply setting
|
|
``os-default-domain`` or ``OS_DEFAULT_DOMAIN`` is sufficient.
|
|
|
|
Thus, a minimal set of environment variables would be:
|
|
|
|
.. code-block:: bash
|
|
|
|
$ export OS_IDENTITY_API_VERSION=3
|
|
$ export OS_AUTH_URL=http://localhost:5000/v3
|
|
$ export OS_DEFAULT_DOMAIN=default
|
|
$ export OS_USERNAME=admin
|
|
$ export OS_PASSWORD=secret
|
|
$ export OS_PROJECT_NAME=admin
|