0d56d0178b
This is represents the current operation Closes-Bug: #1337422 Change-Id: I8092e7723b563647e13b6e2f0b7901a16572b6c7
87 lines
3.9 KiB
ReStructuredText
87 lines
3.9 KiB
ReStructuredText
==============
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Authentication
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==============
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OpenStackClient leverages `python-keystoneclient`_ authentication
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plugins to support a number of different authentication methods.
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.. _`python-keystoneclient`: http://docs.openstack.org/developer/python-keystoneclient/authentication-plugins.html
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Authentication Process
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----------------------
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The user provides some number of authentication credential options.
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If an authentication type is not provided (``--os-auth-type``), the
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authentication options are examined to determine if one of the default
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types can be used. If no match is found an error is reported and OSC exits.
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Note that the authentication call to the Identity service has not yet
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occurred. It is deferred until the last possible moment in order to
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reduce the number of unnecessary queries to the server, such as when further
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processing detects an invalid command.
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Authentication Plugins
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----------------------
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The Keystone client library implements the base set of plugins. Additional
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plugins may be available from the Keystone project or other sources.
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There are at least three authentication types that are always available:
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* **Password**: A project, username and password are used to identify the
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user. An optional domain may also be included. This is the most common
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type and is the default any time a username is supplied. An authentication
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URL for the Identity service is also required. [Required: ``--os-auth-url``,
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``--os-project-name``, ``--os-username``; Optional: ``--os-password``]
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* **Token**: This is slightly different from the usual token authentication
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(described below as token/endpoint) in that a token and an authentication
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URL are supplied and the plugin retrieves a new token.
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[Required: ``--os-auth-url``, ``--os-token``]
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* **Token/Endpoint**: This is the original token authentication (known as 'token
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flow' in the early CLI documentation in the OpenStack wiki). It requires
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a token and a direct endpoint that is used in the API call. The difference
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from the new Token type is this token is used as-is, no call is made
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to the Identity service from the client. This type is most often used to
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bootstrap a Keystone server where the token is the ``admin_token`` configured
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in ``keystone.conf``. It will also work with other services and a regular
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scoped token such as one obtained from a ``token issue`` command.
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[Required: ``--os-url``, ``--os-token``]
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* **Others**: Other authentication plugins such as SAML, Kerberos, and OAuth1.0
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are under development and also supported. To use them, they must be selected
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by supplying the ``--os-auth-type`` option.
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Detailed Process
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----------------
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The authentication process in OpenStackClient is all contained in and handled
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by the ``ClientManager`` object.
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* On import ``api.auth``:
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* obtains the list of installed Keystone authentication
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plugins from the ``keystoneclient.auth.plugin`` entry point.
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* builds a list of authentication options from the plugins.
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* A new ``ClientManager`` is created and supplied with the set of options from the
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command line and/or environment:
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* If ``--os-auth-type`` is provided and is a valid and available plugin
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it is used.
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* If ``--os-auth-type`` is not provided an authentication plugin
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is selected based on the existing options. This is a short-circuit
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evaluation, the first match wins.
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* If ``--os-endpoint`` and ``--os-token`` are both present ``token_endpoint``
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is selected
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* If ``--os-username`` is supplied ``password`` is selected
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* If ``--os-token`` is supplied ``token`` is selected
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* If no selection has been made by now exit with error
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* Load the selected plugin class.
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* When an operation that requires authentication is attempted ``ClientManager``
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makes the actual inital request to the Identity service.
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* if ``--os-auth-url`` is not supplied for any of the types except
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Token/Endpoint, exit with an error.
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