bf67b3c884
Modify the FederationProtocolModel class and add the remote_id_atributte to the federation_protocol table. Add the respective migration and tests files. And also modify the schema to expect a remote_id_attribute property. Closes-bug: #1724645 Co-authored-by: Colleen Murphy<colleen@gazlene.net> Change-Id: I9802c8a5c187bae16de89893ca8639b01cd7cb1b
365 lines
9.8 KiB
ReStructuredText
365 lines
9.8 KiB
ReStructuredText
.. -*- rst -*-
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===================
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OS-FEDERATION API
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===================
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Provide the ability for users to manage Identity Providers (IdPs) and establish
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a set of rules to map federation protocol attributes to Identity API
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attributes. Requires v3.0+ of the Identity API.
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What's New in Version 1.4
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=========================
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Corresponding to Identity API v3.12 release.
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- Added `remote_id_attribute` as an attribute of a Protocol.
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What's New in Version 1.3
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=========================
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Corresponding to Identity API v3.5 release.
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- Added Identity Provider specific websso routes.
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What's New in Version 1.2
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=========================
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Corresponding to Identity API v3.4 release.
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- Add websso routes.
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What's New in Version 1.1
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=========================
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Corresponding to Identity API v3.3 release. These features are considered
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stable as of September 4th, 2014.
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- Deprecate list projects and domains in favour of core functionality available
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in Identity API v3.3.
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- Introduced a mechanism to exchange an Identity Token for a SAML assertion.
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- Introduced a mechanism to retrieve Identity Provider Metadata.
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Definitions
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===========
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- *Trusted Identity Provider*: An identity provider set up within the Identity
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API that is trusted to provide authenticated user information.
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- *Service Provider*: A system entity that provides services to principals or
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other system entities, in this case, the OpenStack Identity API is the
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Service Provider.
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- *Attribute Mapping*: The user information passed by a federation protocol for
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an already authenticated identity are called ``attributes``. Those
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``attributes`` may not align directly with the Identity API concepts. To help
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overcome such mismatches, a mapping can be done either on the sending side
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(third party identity provider), on the consuming side (Identity API
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service), or both.
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- *Protocol*: A protocol capable of performing federated identity authentication.
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For example, the OpenID Connect or SAML 2.0 protocols.
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API Resources
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=============
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Identity Providers
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------------------
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::
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/v3/OS-FEDERATION/identity_providers
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An Identity Provider (IdP) is a third party service that is trusted by the
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Identity API to authenticate identities.
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Optional attributes:
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- ``domain_id`` (string)
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The ID of the domain that is associated with the IdP.
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If a value is not specified by the client, the service will automatically
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create a domain and associate it to the IdP. The ``domain_id`` is not unique
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so that users can link multiple IdPs to one domain.
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- ``description`` (string)
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Describes the identity provider.
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If a value is not specified by the client, the service will default this
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value to ``null``.
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- ``enabled`` (boolean)
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Indicates whether this identity provider should accept federated
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authentication requests.
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If a value is not specified by the client, the service will default this to
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``false``.
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- ``remote_ids`` (list)
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Valid remote IdP entity values from Identity Providers. If a value is not
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specified by the client, the list will be empty.
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Protocols
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---------
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::
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/v3/OS-FEDERATION/identity_providers/{idp_id}/protocols
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A protocol entry contains information that dictates which mapping rules to use
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for a given incoming request. An IdP may have multiple supported protocols.
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Required attributes:
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- ``mapping_id`` (string)
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Indicates which mapping should be used to process federated authentication
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requests.
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Optional attributes:
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- ``remote_id_attribute`` (string)
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Key to obtain the entity ID of the Identity Provider from the HTTPD
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environment. For `mod_shib`, this would be `Shib-Identity-Provider`. For
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`mod_auth_openidc`, this could be `HTTP_OIDC_ISS`. For `mod_auth_mellon`,
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this could be `MELLON_IDP`. This overrides the default value provided in
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keystone.conf.
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Mappings
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--------
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::
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/v3/OS-FEDERATION/mappings
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A ``mapping`` is a set of rules to map federation protocol attributes to
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Identity API objects. An Identity Provider can have a single ``mapping``
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specified per protocol. A mapping is simply a list of ``rules``.
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Required attributes:
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- ``rules`` (list of objects)
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Each object contains a rule for mapping attributes to Identity API concepts.
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A rule contains a ``remote`` attribute description and the destination
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``local`` attribute.
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- ``local`` (list of objects)
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References a local Identity API resource, such as a ``group`` or ``user`` to
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which the remote attributes will be mapped.
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Each object has one of two structures, as follows.
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To map a remote attribute value directly to a local attribute, identify the
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local resource type and attribute:
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::
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[
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{
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"local": [
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{
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"user": {
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"name": "{0}"
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}
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}
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],
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}
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]
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If the ``user`` attribute is missing when processing an assertion, server
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tries to directly map ``REMOTE_USER`` environment variable. If this variable
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is also unavailable the server returns an HTTP ``401 Unauthorized`` error.
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If the ``user`` has the attribute ``type`` set to ``local`` as well as a
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domain specified, the user is treated as existing in the local keystone
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backend, and the server will attempt to fetch user details (id, name, roles,
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groups) from the identity backend.
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If, however, the user does not exist in the backend, the server will
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respond with an appropriate HTTP error code.
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If the ``type`` attribute is not set to ``local`` in the local rule and no
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domain is specified, the user is deemed ephemeral and becomes a member of
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the identity provider's domain.
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An example of user object mapping to an existing local user:
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::
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[
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{
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"local": [
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{
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"user": {
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"name": "username",
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"type": "local",
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"domain": {
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"name": "domain_name"
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}
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}
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}
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],
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}
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]
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For attribute type and value mapping, identify the local resource type,
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attribute, and value:
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::
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[
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{
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"local": [
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{
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"group": {
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"id": "89678b"
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}
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}
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],
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}
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]
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This assigns authorization attributes, by way of role assignments on the
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specified group, to ephemeral users. The users are not added to the group,
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but for the duration of the token they will receive the same authorization
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as if they were.
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::
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[
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{
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"local": [
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{
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"group_ids": "{0}"
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}
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],
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}
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]
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It is also possible to map multiple groups by providing a list of group ids.
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Those group ids can also be white/blacklisted.
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- ``remote`` (list of objects)
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At least one object must be included.
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If more than one object is included, the local attribute is applied only if
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all remote attributes match.
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The value identified by ``type`` is always passed through unless a constraint
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is specified using either ``any_one_of`` or ``not_one_of``.
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- ``type`` (string)
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This represents an assertion type keyword.
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- ``any_one_of`` (list of strings)
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This is mutually exclusive with ``not_any_of``.
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The rule is matched only if any of the specified strings appear in the
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remote attribute ``type``.
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- ``not_any_of`` (list of strings)
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This is mutually exclusive with ``any_one_of``.
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The rule is not matched if any of the specified strings appear in the
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remote attribute ``type``.
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- ``regex`` (boolean)
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If ``true``, then each string will be evaluated as a `regular expression
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<http://docs.python.org/2/library/re.html>`__ search against the remote
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attribute ``type``.
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The ``blacklist`` and ``whitelist`` rules are always used in conjunction with
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``type``.
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- ``blacklist`` (list of strings)
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This is mutually exclusive with ``whitelist``.
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The rule works as a filter, removing any specified strings that are
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listed there from the remote attribute ``type``.
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- ``whitelist`` (list of strings)
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This is mutually exclusive with ``blacklist``.
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The rule works as a filter, allowing only the specified strings in
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the remote attribute ``type`` to be passed ahead.
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Service Providers
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-----------------
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::
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/v3/OS-FEDERATION/service_providers
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A service provider is a third party service that is trusted by the Identity
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Service.
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Required attributes:
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- ``auth_url`` (string)
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Specifies the protected URL where tokens can be retrieved once the user is
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authenticated.
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- ``sp_url`` (string)
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Specifies the URL at the remote peer where assertion should be sent.
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Optional attributes:
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- ``description`` (string)
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Describes the service provider
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If a value is not specified by the client, the service may default this value
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to ``null``.
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- ``enabled`` (boolean)
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Indicates whether bursting into this service provider is enabled by cloud
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administrators. If set to ``false`` the SP will not appear in the catalog and
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requests to generate an assertion will result in a 403 error.
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If a value is not specified by the client, the service will default this to
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``false``.
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- ``relay_state_prefix`` (string)
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Indicates the relay state prefix, used in the ECP wrapped SAML messages, by the
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Service Provider.
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If a value is not specified by the client, the service will default this value
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to ``ss:mem:``.
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APIs
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====
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.. include:: federation/identity-provider/idp.inc
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.. include:: federation/mapping/mapping.inc
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.. include:: federation/service-provider/sp.inc
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.. include:: federation/projects-domains/projects-domains.inc
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.. include:: federation/auth/auth.inc
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.. include:: federation/assertion/assertion.inc
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