678 lines
34 KiB
Plaintext
678 lines
34 KiB
Plaintext
[role="xpack"]
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[[oidc-guide]]
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== Configuring single sign-on to the {stack} using OpenID Connect
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The Elastic Stack supports single sign-on (SSO) using OpenID Connect via {kib} using
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{es} as the backend service that holds most of the functionality. {kib} and {es}
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together represent an OpenID Connect Relying Party (RP) that supports the authorization code flow and implicit flow as these are defined in the OpenID Connect specification.
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This guide assumes that you have an OpenID Connect Provider where the
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Elastic Stack Relying Party will be registered.
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NOTE: The OpenID Connect realm support in {kib} is designed with the expectation that it
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will be the primary authentication method for the users of that {kib} instance. The
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<<oidc-kibana>> section describes what this entails and how you can set it up to support
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other realms if necessary.
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[[oidc-guide-op]]
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=== The OpenID Connect Provider
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The OpenID Connect Provider (OP) is the entity in OpenID Connect that is responsible for
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authenticating the user and for granting the necessary tokens with the authentication and
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user information to be consumed by the Relying Parties.
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In order for the Elastic Stack to be able use your OpenID Connect Provider for authentication,
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a trust relationship needs to be established between the OP and the RP. In the OpenID Connect
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Provider, this means registering the RP as a client. OpenID Connect defines a dynamic client
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registration protocol but this is usually geared towards real-time client registration and
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not the trust establishment process for cross security domain single sign on. All OPs will
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also allow for the manual registration of an RP as a client, via a user interface or (less often)
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via the consumption of a metadata document.
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The process for registering the Elastic Stack RP will be different from OP to OP and following
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the provider's relevant documentation is prudent. The information for the
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RP that you commonly need to provide for registration are the following:
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- `Relying Party Name`: An arbitrary identifier for the relying party. Neither the specification
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nor the Elastic Stack implementation impose any constraints on this value.
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- `Redirect URI`: This is the URI where the OP will redirect the user's browser after authentication. The
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appropriate value for this will depend on your setup and whether or not {kib} sits behind a proxy or
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load balancer. It will typically be +$\{kibana-url}/api/security/v1/oidc+ (for the authorization code flow) or +$\{kibana-url}/api/security/v1/oidc/implicit+ (for the implicit flow) where _$\{kibana-url}_ is the base URL for your {kib} instance. You might also see this
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called `Callback URI`.
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At the end of the registration process, the OP will assign a Client Identifier and a Client Secret for the RP ({stack}) to use.
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Note these two values as they will be used in the {es} configuration.
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[[oidc-guide-authentication]]
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=== Configure {es} for OpenID Connect authentication
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The following is a summary of the configuration steps required in order to enable authentication
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using OpenID Connect in {es}:
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. <<oidc-enable-http,Enable SSL/TLS for HTTP>>
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. <<oidc-enable-token,Enable the Token Service>>
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. <<oidc-create-realm,Create one or more OpenID Connect realms>>
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. <<oidc-role-mapping,Configure role mappings>>
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[[oidc-enable-http]]
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==== Enable TLS for HTTP
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If your {es} cluster is operating in production mode, then you must
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configure the HTTP interface to use SSL/TLS before you can enable OpenID Connect
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authentication.
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For more information, see <<tls-http>>.
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[[oidc-enable-token]]
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==== Enable the token service
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The {es} OpenID Connect implementation makes use of the {es} Token Service. This service
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is automatically enabled if you configure TLS on the HTTP interface, and can be
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explicitly configured by including the following in your `elasticsearch.yml` file:
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[source, yaml]
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------------------------------------------------------------
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xpack.security.authc.token.enabled: true
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------------------------------------------------------------
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[[oidc-create-realm]]
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==== Create an OpenID Connect realm
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OpenID Connect based authentication is enabled by configuring the appropriate realm within
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the authentication chain for {es}.
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This realm has a few mandatory settings, and a number of optional settings.
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The available settings are described in detail in
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<<ref-oidc-settings>>. This
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guide will explore the most common settings.
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Create an OpenID Connect (the realm type is `oidc`) realm in your `elasticsearch.yml` file
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similar to what is shown below:
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NOTE: The values used below are meant to be an example and are not intended to apply to
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every use case. The details below the configuration snippet provide insights and suggestions
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to help you pick the proper values, depending on your OP configuration.
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[source, yaml]
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-------------------------------------------------------------------------------------
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xpack.security.authc.realms.oidc.oidc1:
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order: 2
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rp.client_id: "the_client_id"
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rp.response_type: code
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rp.redirect_uri: "https://kibana.example.org:5601/api/security/v1/oidc"
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op.issuer: "https://op.example.org"
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op.authorization_endpoint: "https://op.example.org/oauth2/v1/authorize"
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op.token_endpoint: "https://op.example.org/oauth2/v1/token"
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op.jwkset_path: oidc/jwkset.json
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op.userinfo_endpoint: "https://op.example.org/oauth2/v1/userinfo"
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op.endsession_endpoint: "https://op.example.org/oauth2/v1/logout"
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rp.post_logout_redirect_uri: "https://kibana.example.org:5601/logged_out"
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claims.principal: sub
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claims.groups: "http://example.info/claims/groups"
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-------------------------------------------------------------------------------------
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The configuration values used in the example above are:
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xpack.security.authc.realms.oidc.oidc1::
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This defines a new `oidc` authentication realm named "oidc1".
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See <<realms>> for more explanation of realms.
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order::
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You should define a unique order on each realm in your authentication chain.
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It is recommended that the OpenID Connect realm be at the bottom of your authentication
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chain (that is, that it has the _highest_ order).
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rp.client_id::
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This, usually opaque, arbitrary string, is the Client Identifier that was assigned to the Elastic Stack RP by the OP upon
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registration.
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rp.response_type::
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This is an identifier that controls which OpenID Connect authentication flow this RP supports and also
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which flow this RP requests the OP should follow. Supported values are
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- `code`, which means that the RP wants to use the Authorization Code flow. If your OP supports the
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Authorization Code flow, you should select this instead of the Implicit Flow.
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- `id_token token` which means that the RP wants to use the Implicit flow and we also request an oAuth2
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access token from the OP, that we can potentially use for follow up requests ( UserInfo ). This
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should be selected if the OP offers a UserInfo endpoint in its configuration, or if you know that
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the claims you will need to use for role mapping are not available in the ID Token.
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- `id_token` which means that the RP wants to use the Implicit flow, but is not interested in getting
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an oAuth2 token too. Select this if you are certain that all necessary claims will be contained in
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the ID Token or if the OP doesn't offer a User Info endpoint.
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rp.redirect_uri::
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The redirect URI where the OP will redirect the browser after authentication. This needs to be
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_exactly_ the same as the one <<oidc-guide-op, configured with the OP upon registration>> and will
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typically be +$\{kibana-url}/api/security/v1/oidc+ where _$\{kibana-url}_ is the base URL for your {kib} instance
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op.issuer::
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A verifiable Identifier for your OpenID Connect Provider. An Issuer Identifier is usually a case sensitive URL.
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The value for this setting should be provided by your OpenID Connect Provider.
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op.authorization_endpoint::
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The URL for the Authorization Endpoint in the OP. This is where the user's browser
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will be redirected to start the authentication process. The value for this setting should be provided by your
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OpenID Connect Provider.
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op.token_endpoint::
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The URL for the Token Endpoint in the OpenID Connect Provider. This is the endpoint where
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{es} will send a request to exchange the code for an ID Token. This setting is optional when
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you use the implicit flow. The value for this setting should be provided by your OpenID Connect Provider.
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op.jwkset_path::
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The path to a file or a URL containing a JSON Web Key Set with the key material that the OpenID Connect
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Provider uses for signing tokens and claims responses. If a path is set, it is resolved relative to the {es}
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config directory.
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{es} will automatically monitor this file for changes and will reload the configuration whenever
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it is updated. Your OpenID Connect Provider should provide you with this file or a URL where it is available.
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op.userinfo_endpoint::
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(Optional) The URL for the UserInfo Endpoint in the OpenID Connect Provider. This is the endpoint of the OP that
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can be queried to get further user information, if required. The value for this setting should be provided by your
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OpenID Connect Provider.
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op.endsession_endpoint::
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(Optional) The URL to the End Session Endpoint in the OpenID Connect Provider. This is the endpoint where the user's
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browser will be redirected after local logout, if the realm is configured for RP initiated Single Logout and
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the OP supports it. The value for this setting should be provided by your OpenID Connect Provider.
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rp.post_logout_redirect_uri::
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(Optional) The Redirect URL where the OpenID Connect Provider should redirect the user after a
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successful Single Logout (assuming `op.endsession_endpoint` above is also set). This should be set to a value that
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will not trigger a new OpenID Connect Authentication, such as +$\{kibana-url}/logged_out+ where _$\{kibana-url}_ is
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the base URL for your {kib} instance.
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claims.principal:: See <<oidc-claims-mapping>>.
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claims.groups:: See <<oidc-claims-mapping>>.
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A final piece of configuration of the OpenID Connect realm is to set the `Client Secret` that was assigned
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to the RP during registration in the OP. This is a secure setting and as such is not defined in the realm
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configuration in `elasticsearch.yml` but added to the <<secure-settings,elasticsearch keystore>>.
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For instance
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[source,sh]
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----
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bin/elasticsearch-keystore add xpack.security.authc.realms.oidc.oidc1.rp.client_secret
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----
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NOTE: According to the OpenID Connect specification, the OP should also make their configuration
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available at a well known URL, which is the concatenation of their `Issuer` value with the
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`.well-known/openid-configuration` string. For example: `https://op.org.com/.well-known/openid-configuration`
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That document should contain all the necessary information to configure the OpenID Connect realm in {es}.
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[[oidc-claims-mapping]]
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==== Claims mapping
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===== Claims and scopes
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When authenticating to {kib} using OpenID Connect, the OP will provide information about the user
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in the form of OpenID Connect Claims, that can be included either in the ID Token, or be retrieved from the
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UserInfo endpoint of the OP. The claim is defined as a piece of information asserted by the OP
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for the authenticated user. Simply put, a claim is a name/value pair that contains information about
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the user. Related to claims, we also have the notion of OpenID Connect Scopes. Scopes are identifiers
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that are used to request access to specific lists of claims. The standard defines a set of scope
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identifiers that can be requested. The only mandatory one is `openid`, while commonly used ones are
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`profile` and `email`. The `profile` scope requests access to the `name`,`family_name`,`given_name`,`middle_name`,`nickname`,
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`preferred_username`,`profile`,`picture`,`website`,`gender`,`birthdate`,`zoneinfo`,`locale`, and `updated_at` claims.
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The `email` scope requests access to the `email` and `email_verified` claims. The process is that
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the RP requests specific scopes during the authentication request. If the OP Privacy Policy
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allows it and the authenticating user consents to it, the related claims are returned to the
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RP (either in the ID Token or as a UserInfo response).
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The list of the supported claims will vary depending on the OP you are using, but you can expect
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the https://openid.net/specs/openid-connect-core-1_0.html#StandardClaims[Standard Claims] to be
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largely supported.
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[[oidc-claim-to-property]]
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===== Mapping claims to user properties
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The goal of claims mapping is to configure {es} in such a way as to be able to map the values of
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specified returned claims to one of the <<oidc-user-properties, user properties>> that are supported
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by {es}. These user properties are then utilized to identify the user in the {kib} UI or the audit
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logs, and can also be used to create <<oidc-role-mapping, role mapping>> rules.
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The recommended steps for configuring OpenID Claims mapping are as follows:
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. Consult your OP configuration to see what claims it might support. Note that
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the list provided in the OP's metadata or in the configuration page of the OP
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is a list of potentially supported claims. However, for privacy reasons it might
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not be a complete one, or not all supported claims will be available for all
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authenticated users.
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. Read through the list of <<oidc-user-properties, user properties>> that {es}
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supports, and decide which of them are useful to you, and can be provided by
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your OP in the form of claims. At a _minimum_, the `principal` user property
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is required.
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. Configure your OP to "release" those claims to your {stack} Relying
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party. This process greatly varies by provider. You can use a static
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configuration while others will support that the RP requests the scopes that
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correspond to the claims to be "released" on authentication time. See
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<<ref-oidc-settings,`rp.requested_scopes`>> for details about how
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to configure the scopes to request. To ensure interoperability and minimize
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the errors, you should only request scopes that the OP supports, and which you
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intend to map to {es} user properties.
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. Configure the OpenID Connect realm in {es} to associate the {es} user properties (see
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<<oidc-user-properties, the listing>> below), to the name of the claims that your
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OP will release. In the example above, we have configured the `principal` and
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`groups` user properties as follows:
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.. `claims.principal: sub` : This instructs {es} to look for the OpenID Connect claim named `sub`
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in the ID Token that the OP issued for the user ( or in the UserInfo response ) and assign the
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value of this claim to the `principal` user property. `sub` is a commonly used claim for the
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principal property as it is an identifier of the user in the OP and it is also a required
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claim of the ID Token, thus offering guarantees that it will be available. It is, however,
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only used as an example here, the OP may provide another claim that is a better fit for your needs.
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.. `claims.groups: "http://example.info/claims/groups"` : Similarly, this instructs {es} to look
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for the claim with the name `http://example.info/claims/groups` (note that this is a URI - an
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identifier, treated as a string and not a URL pointing to a location that will be retrieved)
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either in the ID Token or in the UserInfo response, and map the value(s) of it to the user
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property `groups` in {es}. There is no standard claim in the specification that is used for
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expressing roles or group memberships of the authenticated user in the OP, so the name of the
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claim that should be mapped here, will vary greatly between providers. Consult your OP
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documentation for more details.
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[[oidc-user-properties]]
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===== {es} user properties
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The {es} OpenID Connect realm can be configured to map OpenID Connect claims to the
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following properties on the authenticated user:
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principal:: _(Required)_
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This is the _username_ that will be applied to a user that authenticates
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against this realm.
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The `principal` appears in places such as the {es} audit logs.
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NOTE: If the principal property fails to be mapped from a claim, the authentication fails.
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groups:: _(Recommended)_
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If you wish to use your OP's concept of groups or roles as the basis for a
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user's {es} privileges, you should map them with this property.
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The `groups` are passed directly to your <<oidc-role-mapping, role mapping rules>>.
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name:: _(Optional)_ The user's full name.
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mail:: _(Optional)_ The user's email address.
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dn:: _(Optional)_ The user's X.500 _Distinguished Name_.
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===== Extracting partial values from OpenID Connect claims
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There are some occasions where the value of a claim may contain more information
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than you wish to use within {es}. A common example of this is one where the
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OP works exclusively with email addresses, but you would like the user's
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`principal` to use the _local-name_ part of the email address.
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For example if their email address was `james.wong@staff.example.com`, then you
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would like their principal to simply be `james.wong`.
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This can be achieved using the `claim_patterns` setting in the {es}
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realm, as demonstrated in the realm configuration below:
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[source, yaml]
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-------------------------------------------------------------------------------------
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xpack.security.authc.realms.oidc.oidc1:
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order: 2
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rp.client_id: "the_client_id"
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rp.response_type: code
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rp.redirect_uri: "https://kibana.example.org:5601/api/security/v1/oidc"
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op.authorization_endpoint: "https://op.example.org/oauth2/v1/authorize"
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op.token_endpoint: "https://op.example.org/oauth2/v1/token"
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op.userinfo_endpoint: "https://op.example.org/oauth2/v1/userinfo"
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op.endsession_endpoint: "https://op.example.org/oauth2/v1/logout"
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op.issuer: "https://op.example.org"
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op.jwkset_path: oidc/jwkset.json
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claims.principal: email_verified
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claim_patterns.principal: "^([^@]+)@staff\\.example\\.com$"
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-------------------------------------------------------------------------------------
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In this case, the user's `principal` is mapped from the `email_verified` claim, but a
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regular expression is applied to the value before it is assigned to the user.
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If the regular expression matches, then the result of the first group is used as the
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effective value. If the regular expression does not match then the claim
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mapping fails.
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In this example, the email address must belong to the `staff.example.com` domain,
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and then the local-part (anything before the `@`) is used as the principal.
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Any users who try to login using a different email domain will fail because the
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regular expression will not match against their email address, and thus their
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principal user property - which is mandatory - will not be populated.
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IMPORTANT: Small mistakes in these regular expressions can have significant
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security consequences. For example, if we accidentally left off the trailing
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`$` from the example above, then we would match any email address where the
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domain starts with `staff.example.com`, and this would accept an email
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address such as `admin@staff.example.com.attacker.net`. It is important that
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you make sure your regular expressions are as precise as possible so that
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you do not inadvertently open an avenue for user impersonation attacks.
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[[third-party-login]]
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==== Third party initiated single sign-on
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The Open ID Connect realm in {es} supports 3rd party initiated login as described in the
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https://openid.net/specs/openid-connect-core-1_0.html#ThirdPartyInitiatedLogin[relevant specification].
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This allows the OP itself or another, third party other than the RP, to initiate the authentication
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process while requesting the OP to be used for the authentication. Please note that the Elastic
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Stack RP should already be configured for this OP, in order for this process to succeed.
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[[oidc-logout]]
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==== OpenID Connect Logout
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The OpenID Connect realm in {es} supports RP-Initiated Logout Functionality as
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described in the
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https://openid.net/specs/openid-connect-session-1_0.html#RPLogout[relevant part of the specification]
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In this process, the OpenID Connect RP (the Elastic Stack in this case) will redirect the user's
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browser to predefined URL of the OP after successfully completing a local logout. The OP can then
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logout the user also, depending on the configuration, and should finally redirect the user back to the
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RP. The `op.endsession_endpoint` in the realm configuration determines the URL in the OP that the browser
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will be redirected to. The `rp.post_logout_redirect_uri` setting determines the URL to redirect
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the user back to after the OP logs them out.
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When configuring `rp.post_logout_redirect_uri`, care should be taken to not point this to a URL that
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will trigger re-authentication of the user. For instance, when using OpenID Connect to support
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single sign-on to {kib}, this could be set to +$\{kibana-url}/logged_out+, which will show a user-
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friendly message to the user.
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[[oidc-ssl-config]]
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==== OpenID Connect Realm SSL Configuration
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OpenID Connect depends on TLS to provide security properties such as encryption in transit and endpoint authentication. The RP
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is required to establish back-channel communication with the OP in order to exchange the code for an ID Token during the
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Authorization code grant flow and in order to get additional user information from the UserInfo endpoint. Furthermore, if
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you configure `op.jwks_path` as a URL, {es} will need to get the OP's signing keys from the file hosted there. As such, it is
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important that {es} can validate and trust the server certificate that the OP uses for TLS. Since the system truststore is
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used for the client context of outgoing https connections, if your OP is using a certificate from a trusted CA, no additional
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configuration is needed.
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However, if the issuer of your OP's certificate is not trusted by the JVM on which {es} is running (e.g it uses a organization CA), then you must configure
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{es} to trust that CA. Assuming that you have the CA certificate that has signed the certificate that the OP uses for TLS
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stored in the /oidc/company-ca.pem` file stored in the configuration directory of {es}, you need to set the following
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property in the realm configuration:
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[source, yaml]
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-------------------------------------------------------------------------------------
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xpack.security.authc.realms.oidc.oidc1:
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order: 1
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...
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ssl.certificate_authorities: ["/oidc/company-ca.pem"]
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-------------------------------------------------------------------------------------
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[[oidc-role-mapping]]
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=== Configuring role mappings
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When a user authenticates using OpenID Connect, they are identified to the Elastic Stack,
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but this does not automatically grant them access to perform any actions or
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access any data.
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Your OpenID Connect users cannot do anything until they are assigned roles. This can be done
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through either the
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<<security-api-put-role-mapping,add role mapping API>> or with
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<<authorization_realms,authorization realms>>.
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NOTE: You cannot use <<mapping-roles-file,role mapping files>>
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to grant roles to users authenticating via OpenID Connect.
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This is an example of a simple role mapping that grants the `kibana_user` role
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to any user who authenticates against the `oidc1` OpenID Connect realm:
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[source,console]
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--------------------------------------------------
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PUT /_security/role_mapping/oidc-kibana
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{
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"roles": [ "kibana_user" ],
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"enabled": true,
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"rules": {
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"field": { "realm.name": "oidc1" }
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}
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}
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--------------------------------------------------
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The user properties that are mapped via the realm configuration are used to process
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role mapping rules, and these rules determine which roles a user is granted.
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The user fields that are provided to the role
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mapping are derived from the OpenID Connect claims as follows:
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- `username`: The `principal` user property
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- `dn`: The `dn` user property
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- `groups`: The `groups` user property
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- `metadata`: See <<oidc-user-metadata>>
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For more information, see <<mapping-roles>> and
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<<security-role-mapping-apis,role mapping APIs>>.
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If your OP has the ability to provide groups or roles to RPs via tha use of
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an OpenID Claim, then you should map this claim to the `claims.groups` setting in
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the {es} realm (see <<oidc-claim-to-property>>), and then make use of it in a role mapping
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as per the example below.
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This mapping grants the {es} `finance_data` role, to any users who authenticate
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via the `oidc1` realm with the `finance-team` group membership.
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[source,console]
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--------------------------------------------------
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PUT /_security/role_mapping/oidc-finance
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{
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"roles": [ "finance_data" ],
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"enabled": true,
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"rules": { "all": [
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{ "field": { "realm.name": "oidc1" } },
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{ "field": { "groups": "finance-team" } }
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] }
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}
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--------------------------------------------------
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If your users also exist in a repository that can be directly accessed by {es}
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(such as an LDAP directory) then you can use
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<<authorization_realms, authorization realms>> instead of role mappings.
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In this case, you perform the following steps:
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1. In your OpenID Connect realm, assign a claim to act as the lookup userid,
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by configuring the `claims.principal` setting.
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2. Create a new realm that can lookup users from your local repository (e.g. an
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`ldap` realm)
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3. In your OpenID Connect realm, set `authorization_realms` to the name of the realm you
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created in step 2.
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[[oidc-user-metadata]]
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=== User metadata
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By default users who authenticate via OpenID Connect will have some additional metadata
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fields. These fields will include every OpenID Claim that is provided in the authentication response
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(regardless of whether it is mapped to an {es} user property). For example,
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in the metadata field `oidc(claim_name)`, "claim_name" is the name of the
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claim as it was contained in the ID Token or in the User Info response. Note that these will
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include all the https://openid.net/specs/openid-connect-core-1_0.html#IDToken[ID Token claims]
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that pertain to the authentication event, rather than the user themselves.
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This behaviour can be disabled by adding `populate_user_metadata: false` as
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a setting in the oidc realm.
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[[oidc-kibana]]
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=== Configuring {kib}
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OpenID Connect authentication in {kib} requires a small number of additional settings
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in addition to the standard {kib} security configuration. The
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{kibana-ref}/using-kibana-with-security.html[{kib} security documentation]
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provides details on the available configuration options that you can apply.
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In particular, since your {es} nodes have been configured to use TLS on the HTTP
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interface, you must configure {kib} to use a `https` URL to connect to {es}, and
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you may need to configure `elasticsearch.ssl.certificateAuthorities` to trust
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the certificates that {es} has been configured to use.
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OpenID Connect authentication in {kib} is also subject to the
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`xpack.security.sessionTimeout` setting that is described in the {kib} security
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documentation, and you may wish to adjust this timeout to meet your local needs.
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The three additional settings that are required for OpenID Connect support are shown below:
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[source, yaml]
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------------------------------------------------------------
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xpack.security.authc.providers: [oidc]
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xpack.security.authc.oidc.realm: "oidc1"
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server.xsrf.whitelist: [/api/security/v1/oidc]
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------------------------------------------------------------
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The configuration values used in the example above are:
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`xpack.security.authc.providers`::
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Set this to `[ oidc ]` to instruct {kib} to use OpenID Connect single sign-on as the
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authentication method. This instructs Kibana to attempt to initiate an SSO flow
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everytime a user attempts to access a URL in Kibana, if the user is not already
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authenticated. If you also want to allow users to login with a username and password,
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you must enable the `basic` authentication provider too. For example:
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[source, yaml]
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------------------------------------------------------------
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xpack.security.authc.providers: [oidc, basic]
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------------------------------------------------------------
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This will allow users that haven't already authenticated with OpenID Connect to
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navigate directly to the `/login` page in {kib} in order to use the login form.
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`xpack.security.authc.oidc.realm`::
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The name of the OpenID Connect realm in {es} that should handle authentication
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for this Kibana instance.
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`server.xsrf.whitelist`::
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{kib} has in-built protection against _Cross Site Request Forgery_ attacks, which
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is designed to prevent the {kib} server from processing requests that
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originated from outside the {kib} application.
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If you use the authorization code flow, {kib} needs to support unsolicited messages that originate from your
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OP or a third party (see <<third-party-login>>). In order to do so, you must explicitly _whitelist_ the
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OpenID Connect authentication endpoint within {kib}, so that the {kib} server will
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not reject these external messages.
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[[oidc-without-kibana]]
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=== OpenID Connect without {kib}
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The OpenID Connect realm is designed to allow users to authenticate to {kib} and as
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such, most of the parts of the guide above make the assumption that {kib} is used.
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This section describes how a custom web application could use the relevant OpenID
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Connect REST APIs in order to authenticate the users to {es}, with OpenID Connect.
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Single sign-on realms such as OpenID Connect and SAML make use of the Token Service in
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{es} and in principle exchange a SAML or OpenID Connect Authentication response for
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an {es} access token and a refresh token. The access token is used as credentials for subsequent calls to {es}. The
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refresh token enables the user to get new {es} access tokens after the current one
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expires.
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NOTE: The {es} Token Service can be seen as a minimal oAuth2 authorization server
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and the access token and refresh token mentioned above are tokens that pertain
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_only_ to this authorization server. They are generated and consumed _only_ by {es}
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and are in no way related to the tokens ( access token and ID Token ) that the
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OpenID Connect Provider issues.
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==== Register the RP with an OpenID Connect Provider
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The Relying Party ( {es} and the custom web app ) will need to be registered as
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client with the OpenID Connect Provider. Note that when registering the
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`Redirect URI`, it needs to be a URL in the custom web app.
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==== OpenID Connect Realm
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An OpenID Connect realm needs to be created and configured accordingly
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in {es}. See <<oidc-guide-authentication>>
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==== Service Account user for accessing the APIs
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The realm is designed with the assumption that there needs to be a privileged entity
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acting as an authentication proxy. In this case, the custom web application is the
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authentication proxy handling the authentication of end users ( more correctly,
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"delegating" the authentication to the OpenID Connect Provider ). The OpenID Connect
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APIs require authentication and the necessary authorization level for the authenticated
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user. For this reason, a Service Account user needs to be created and assigned a role
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that gives them the `manage_oidc` cluster privilege. The use of the `manage_token`
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cluster privilege will be necessary after the authentication takes place, so that the
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the user can maintain access or be subsequently logged out.
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[source,console]
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--------------------------------------------------
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POST /_security/role/facilitator-role
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{
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"cluster" : ["manage_oidc", "manage_token"]
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}
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--------------------------------------------------
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[source,console]
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--------------------------------------------------
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POST /_security/user/facilitator
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{
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"password" : "<somePasswordHere>",
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"roles" : [ "facilitator-role"]
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}
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--------------------------------------------------
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==== Handling the authentication flow
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On a high level, the custom web application would need to perform the following steps in order to
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authenticate a user with OpenID Connect:
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. Make an HTTP POST request to `_security/oidc/prepare`, authenticating as the `facilitator` user, using the name of the
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OpenID Connect realm in the {es} configuration in the request body. See the
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<<security-api-oidc-prepare-authentication,OIDC prepare authentication API>> for more details
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+
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[source,console]
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--------------------------------------------------
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POST /_security/oidc/prepare
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{
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"realm" : "oidc1"
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}
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--------------------------------------------------
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+
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. Handle the response to `/_security/oidc/prepare`. The response from {es} will contain 3 parameters:
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`redirect`, `state`, `nonce`. The custom web application would need to store the values for `state`
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and `nonce` in the user's session (client side in a cookie or server side if session information is
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persisted this way) and redirect the user's browser to the URL that will be contained in the
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`redirect` value.
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. Handle a subsequent response from the OP. After the user is successfully authenticated with the
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OpenID Connect Provider, they will be redirected back to the callback/redirect URI. Upon receiving
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this HTTP GET request, the custom web app will need to make an HTTP POST request to
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`_security/oidc/authenticate`, again - authenticating as the `facilitator` user - passing the URL
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where the user's browser was redirected to, as a parameter, along with the
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values for `nonce` and `state` it had saved in the user's session previously. If more than one
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OpenID Connect realms are configured, the custom web app can specify the name of the realm to be
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used for handling this, but this parameter is optional.
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See <<security-api-oidc-authenticate,OIDC authenticate API>> for more details
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+
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[source,console]
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-----------------------------------------------------------------------
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POST /_security/oidc/authenticate
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{
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"redirect_uri" : "https://oidc-kibana.elastic.co:5603/api/security/v1/oidc?code=jtI3Ntt8v3_XvcLzCFGq&state=4dbrihtIAt3wBTwo6DxK-vdk-sSyDBV8Yf0AjdkdT5I",
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"state" : "4dbrihtIAt3wBTwo6DxK-vdk-sSyDBV8Yf0AjdkdT5I",
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"nonce" : "WaBPH0KqPVdG5HHdSxPRjfoZbXMCicm5v1OiAj0DUFM",
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"realm" : "oidc1"
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}
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-----------------------------------------------------------------------
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// TEST[catch:unauthorized]
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+
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Elasticsearch will validate this and if all is correct will respond with an access token that can be used
|
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as a `Bearer` token for subsequent requests and a refresh token that can be later used to refresh the given
|
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access token as described in <<security-api-get-token,get token API>>.
|
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. At some point, if necessary, the custom web application can log the user out by using the
|
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<<security-api-oidc-logout,OIDC logout API>> passing the access token and refresh token as parameters. For example:
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+
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[source,console]
|
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--------------------------------------------------
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POST /_security/oidc/logout
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{
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"token" : "dGhpcyBpcyBub3QgYSByZWFsIHRva2VuIGJ1dCBpdCBpcyBvbmx5IHRlc3QgZGF0YS4gZG8gbm90IHRyeSB0byByZWFkIHRva2VuIQ==",
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"refresh_token": "vLBPvmAB6KvwvJZr27cS"
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}
|
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--------------------------------------------------
|
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// TEST[catch:unauthorized]
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+
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If the realm is configured accordingly, this may result in a response with a `redirect` parameter indicating where
|
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the user needs to be redirected in the OP in order to complete the logout process.
|