.. -*- rst -*-

=======================
Application Credentials
=======================

Application credentials provide a way to delegate a user's authorization to an
application without sharing the user's password authentication. This is a
useful security measure, especially for situations where the user's
identification is provided by an external source, such as LDAP or a
single-sign-on service. Instead of storing user passwords in config files, a
user creates an application credential for a specific project, with all or a
subset of the role assignments they have on that project, and then stores the
application credential identifier and secret in the config file.

Multiple application credentials may be active at once, so you can easily
rotate application credentials by creating a second one, converting your
applications to use it one by one, and finally deleting the first one.

Application credentials are limited by the lifespan of the user that created
them. If the user is deleted, disabled, or loses a role assignment on a
project, the application credential is deleted.

Application credentials can have their privileges limited in two ways. First,
the owner may specify a subset of their own roles that the application
credential may assume when getting a token for a project. For example, if a
user has the ``member`` role on a project, they also have the implied role
``reader`` and can grant the application credential only the ``reader`` role
for the project:

::

    "roles": [
        {"name": "reader"}
    ]

Users also have the option of delegating more fine-grained access control to
their application credentials by using access rules. For example, to create an
application credential that is constricted to creating servers in nova, the
user can add the following access rules:

::

    "access_rules": [
        {
            "path": "/v2.1/servers",
            "method": "POST",
            "service": "compute"
        }
    ]

The ``"path"`` attribute of application credential access rules uses a wildcard
syntax to make it more flexible. For example, to create an application
credential that is constricted to listing server IP addresses, you could use
either of the following access rules:

::

    "access_rules": [
        {
            "path": "/v2.1/servers/*/ips",
            "method": "GET",
            "service": "compute"
        }
    ]

or equivalently:

::

    "access_rules": [
        {
            "path": "/v2.1/servers/{server_id}/ips",
            "method": "GET",
            "service": "compute"
        }
    ]

In both cases, a request path containing any server ID will match the access
rule. For even more flexibility, the recursive wildcard ``**`` indicates that
request paths containing any number of ``/`` will be matched. For example:

::

    "access_rules": [
        {
            "path": "/v2.1/**",
            "method": "GET",
            "service": "compute"
        }
    ]

will match any nova API for version 2.1.

An access rule created for one application credential can be re-used by providing its ID to another application credential, for example:

::

    "access_rules": [
        {
            "id": "abcdef"
        }
    ]

Authenticating with an Application Credential
=============================================

.. rest_method::  POST /v3/auth/tokens

To authenticate with an application credential, specify
"application_credential" as the auth method. You are not allowed to request a
scope, as the scope is retrieved from the application credential.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/auth_tokens``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - identity: identity
   - methods: auth_methods_application_credential
   - application_credential: request_application_credential_body_required
   - id: request_application_credential_auth_id_body_not_required
   - name: request_application_credential_auth_name_body_not_required
   - secret: request_application_credential_auth_secret_body_required
   - user: request_application_credential_user_body_not_required

Example
~~~~~~~

An application credential can be identified by an ID:

.. literalinclude:: samples/admin/auth-application-credential-id-request.json
   :language: javascript

It can also be identified by its name and a user object:

.. literalinclude:: samples/admin/auth-application-credential-name-request.json
   :language: javascript

Response
--------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - X-Subject-Token: X-Subject-Token
   - token: token
   - application_credential: auth_application_credential_body
   - application_credential.id: response_application_credential_id_body
   - application_credential.name: response_application_credential_name_body
   - application_credential.restricted: response_application_credential_unrestricted_body
   - audit_ids: audit_ids
   - catalog: catalog
   - expires_at: expires_at
   - issued_at: issued_at
   - methods: auth_methods
   - project: project
   - roles: roles
   - user: user
   - user.id: user_id
   - user.name: user_name

Example
~~~~~~~

.. literalinclude:: samples/admin/auth-application-credential-response.json
   :language: javascript

A token created with an application credential will have the scope and roles
designated by the application credential.

Create application credential
=============================

.. rest_method::  POST /v3/users/{user_id}/application_credentials

Creates an application credential for a user on the project to which the
current token is scoped.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/application_credentials``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - user_id: request_application_credential_user_id_path_required
   - application_credential: request_application_credential_body_required
   - name: request_application_credential_name_body_required
   - secret: request_application_credential_secret_body_not_required
   - description: request_application_credential_description_body_not_required
   - expires_at: request_application_credential_expires_at_body_not_required
   - roles: request_application_credential_roles_body_not_required
   - unrestricted: request_application_credential_unrestricted_body_not_required
   - access_rules: request_application_credential_access_rules_body_not_required

Example
~~~~~~~

.. literalinclude:: samples/admin/application-credential-create-request.json
   :language: javascript

Response
--------

.. rest_status_code:: success status.yaml

   - 201

.. rest_status_code:: error status.yaml

   - 400
   - 401
   - 403
   - 404
   - 409

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - application_credential: response_application_credential_body
   - id: response_application_credential_id_body
   - name: response_application_credential_name_body
   - secret: response_application_credential_secret_body
   - description: response_application_credential_description_body
   - expires_at: response_application_credential_expires_at_body
   - project_id: response_application_credential_project_id_body
   - roles: response_application_credential_roles_body
   - access_rules: response_application_credential_access_rules_body
   - unrestricted: response_application_credential_unrestricted_body
   - links: link_response_body

Example
~~~~~~~

.. literalinclude:: samples/admin/application-credential-create-response.json
   :language: javascript

List application credentials
=============================

.. rest_method::  GET /v3/users/{user_id}/application_credentials

List all application credentials for a user.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/application_credentials``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - user_id: request_application_credential_user_id_path_required
   - name: request_application_credential_name_query_not_required

Response
--------

.. rest_status_code:: success status.yaml

   - 200

.. rest_status_code:: error status.yaml

   - 401
   - 403
   - 404

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - application_credential: response_application_credential_body
   - id: response_application_credential_id_body
   - name: response_application_credential_name_body
   - description: response_application_credential_description_body
   - expires_at: response_application_credential_expires_at_body
   - project_id: response_application_credential_project_id_body
   - roles: response_application_credential_roles_body
   - access_rules: response_application_credential_access_rules_body
   - unrestricted: response_application_credential_unrestricted_body
   - links: link_collection

Example
~~~~~~~

.. literalinclude:: samples/admin/application-credential-list-response.json
   :language: javascript

Show application credential details
===================================

.. rest_method::  GET /v3/users/{user_id}/application_credentials/{application_credential_id}

Show details of an application credential.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/application_credentials``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - user_id: request_application_credential_user_id_path_required
   - application_credential_id: request_application_credential_id_path_required

Response
--------

.. rest_status_code:: success status.yaml

   - 200

.. rest_status_code:: error status.yaml

   - 401
   - 403
   - 404

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - application_credential: response_application_credential_body
   - id: response_application_credential_id_body
   - name: response_application_credential_name_body
   - description: response_application_credential_description_body
   - expires_at: response_application_credential_expires_at_body
   - project_id: response_application_credential_project_id_body
   - roles: response_application_credential_roles_body
   - access_rules: response_application_credential_access_rules_body
   - unrestricted: response_application_credential_unrestricted_body
   - links: link_response_body

Example
~~~~~~~

.. literalinclude:: samples/admin/application-credential-get-response.json
   :language: javascript

Delete application credential
=============================

.. rest_method::  DELETE /v3/users/{user_id}/application_credentials/{application_credential_id}

Delete an application credential.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/application_credentials``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - user_id: request_application_credential_user_id_path_required
   - application_credential_id: request_application_credential_id_path_required

Response
--------

.. rest_status_code:: success status.yaml

   - 204

.. rest_status_code:: error status.yaml

   - 401
   - 403
   - 404

List access rules
=================

.. rest_method::  GET /v3/users/{user_id}/access_rules

List all access rules for a user.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/access_rules``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

    - user_id: request_access_rule_user_id_path_required

Response
--------

.. rest_status_code:: success status.yaml

   - 200

.. rest_status_code:: error status.yaml

   - 401
   - 403
   - 404

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - access_rules: response_access_rules_body
   - id: response_access_rules_id_body
   - path: response_access_rules_path_body
   - method: response_access_rules_method_body
   - service: response_access_rules_service_body
   - links: link_collection

Example
~~~~~~~

.. literalinclude:: samples/admin/access-rules-list-response.json
   :language: javascript

Show access rule details
========================

.. rest_method::  GET /v3/users/{user_id}/access_rules/{access_rule_id}

Show details of an access rule.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/access_rules``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - user_id: request_access_rule_user_id_path_required
   - access_rule_id: request_access_rule_id_path_required

Response
--------

.. rest_status_code:: success status.yaml

   - 200

.. rest_status_code:: error status.yaml

   - 401
   - 403
   - 404

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - access_rules: response_access_rules_body
   - id: response_access_rules_id_body
   - path: response_access_rules_path_body
   - method: response_access_rules_method_body
   - service: response_access_rules_service_body
   - links: link_collection

Example
~~~~~~~

.. literalinclude:: samples/admin/access-rule-get-response.json
   :language: javascript

Delete access rule
==================

.. rest_method::  DELETE /v3/users/{user_id}/access_rules/{access_rule_id}

Delete an access rule. An access rule that is still in use by an application
credential cannot be deleted.

Relationship: ``https://docs.openstack.org/api/openstack-identity/3/rel/access_rules``

Request
-------

Parameters
~~~~~~~~~~

.. rest_parameters:: parameters.yaml

   - user_id: request_access_rule_user_id_path_required
   - access_rule_id: request_access_rule_id_path_required

Response
--------

.. rest_status_code:: success status.yaml

   - 204

.. rest_status_code:: error status.yaml

   - 401
   - 403
   - 404