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Configuring an OpenID Connect identity provider

About identity providers in OpenShift Container Platform

By default, only a kubeadmin user exists on your cluster. To specify an identity provider, you must create a custom resource (CR) that describes that identity provider and add it to the cluster.

OpenShift Container Platform user names containing /, :, and % are not supported.

About OpenID Connect authentication

The Authentication Operator in OpenShift Container Platform requires that the configured OpenID Connect identity provider implements the OpenID Connect Discovery specification.

ID Token and UserInfo decryptions are not supported.

By default, the openid scope is requested. If required, extra scopes can be specified in the extraScopes field.

Claims are read from the JWT id_token returned from the OpenID identity provider and, if specified, from the JSON returned by the UserInfo URL.

At least one claim must be configured to use as the user’s identity. The standard identity claim is sub.

You can also indicate which claims to use as the user’s preferred user name, display name, and email address. If multiple claims are specified, the first one with a non-empty value is used. The following table lists the standard claims:

Claim Description

sub

Short for "subject identifier." The remote identity for the user at the issuer.

preferred_username

The preferred user name when provisioning a user. A shorthand name that the user wants to be referred to as, such as janedoe. Typically a value that corresponding to the user’s login or username in the authentication system, such as username or email.

email

Email address.

name

Display name.

See the OpenID claims documentation for more information.

Unless your OpenID Connect identity provider supports the resource owner password credentials (ROPC) grant flow, users must get a token from <namespace_route>/oauth/token/request to use with command-line tools.

Supported OIDC providers

Red Hat tests and supports specific OpenID Connect (OIDC) providers with OpenShift Container Platform. The following OpenID Connect (OIDC) providers are tested and supported with OpenShift Container Platform. Using an OIDC provider that is not on the following list might work with OpenShift Container Platform, but the provider was not tested by Red Hat and therefore is not supported by Red Hat.

  • Active Directory Federation Services for Windows Server

    Currently, it is not supported to use Active Directory Federation Services for Windows Server with OpenShift Container Platform when custom claims are used.

  • GitLab

  • Google

  • Keycloak

  • Microsoft identity platform (Azure Active Directory v2.0)

    Currently, it is not supported to use Microsoft identity platform when group names are required to be synced.

  • Okta

  • Ping Identity

  • Red Hat Single Sign-On

Creating the secret

Identity providers use OpenShift Container Platform Secret objects in the openshift-config namespace to contain the client secret, client certificates, and keys.

Procedure

  • Create a Secret object containing a string by using the following command:

    $ oc create secret generic <secret_name> --from-literal=clientSecret=<secret> -n openshift-config

    You can alternatively apply the following YAML to create the secret:

    apiVersion: v1
kind: Secret
metadata:
  name: <secret_name>
  namespace: openshift-config
type: Opaque
data:
  clientSecret: <base64_encoded_client_secret>

  • You can define a Secret object containing the contents of a file, such as a certificate file, by using the following command:

    $ oc create secret generic <secret_name> --from-file=<path_to_file> -n openshift-config

Creating a config map

Identity providers use OpenShift Container Platform ConfigMap objects in the openshift-config namespace to contain the certificate authority bundle. These are primarily used to contain certificate bundles needed by the identity provider.

Procedure

  • Define an OpenShift Container Platform ConfigMap object containing the certificate authority by using the following command. The certificate authority must be stored in the ca.crt key of the ConfigMap object.

    $ oc create configmap ca-config-map --from-file=ca.crt=/path/to/ca -n openshift-config

    You can alternatively apply the following YAML to create the config map:

    apiVersion: v1
kind: ConfigMap
metadata:
  name: ca-config-map
  namespace: openshift-config
data:
  ca.crt: |
    <CA_certificate_PEM>

Sample OpenID Connect CRs

The following custom resources (CRs) show the parameters and acceptable values for an OpenID Connect identity provider.

If you must specify a custom certificate bundle, extra scopes, extra authorization request parameters, or a userInfo URL, use the full OpenID Connect CR.

Standard OpenID Connect CR
apiVersion: config.openshift.io/v1
kind: OAuth
metadata:
  name: cluster
spec:
  identityProviders:
  - name: oidcidp (1)
    mappingMethod: claim (2)
    type: OpenID
    openID:
      clientID: ... (3)
      clientSecret: (4)
        name: idp-secret
      claims: (5)
        preferredUsername:
        - preferred_username
        name:
        - name
        email:
        - email
        groups:
        - groups
      issuer: https://www.idp-issuer.com (6)
1 This provider name is prefixed to the value of the identity claim to form an identity name. It is also used to build the redirect URL.
2 Controls how mappings are established between this provider’s identities and User objects.
3 The client ID of a client registered with the OpenID provider. The client must be allowed to redirect to https://oauth-openshift.apps.<cluster_name>.<cluster_domain>/oauth2callback/<idp_provider_name>.
4 A reference to an OpenShift Container Platform Secret object containing the client secret.
5 The list of claims to use as the identity. The first non-empty claim is used.
6 The Issuer Identifier described in the OpenID spec. Must use https without query or fragment component.
Full OpenID Connect CR
apiVersion: config.openshift.io/v1
kind: OAuth
metadata:
  name: cluster
spec:
  identityProviders:
  - name: oidcidp
    mappingMethod: claim
    type: OpenID
    openID:
      clientID: ...
      clientSecret:
        name: idp-secret
      ca: (1)
        name: ca-config-map
      extraScopes: (2)
      - email
      - profile
      extraAuthorizeParameters: (3)
        include_granted_scopes: "true"
      claims:
        preferredUsername: (4)
        - preferred_username
        - email
        name: (5)
        - nickname
        - given_name
        - name
        email: (6)
        - custom_email_claim
        - email
        groups: (7)
        - groups
      issuer: https://www.idp-issuer.com
1 Optional: Reference to an OpenShift Container Platform config map containing the PEM-encoded certificate authority bundle to use in validating server certificates for the configured URL.
2 Optional: The list of scopes to request, in addition to the openid scope, during the authorization token request.
3 Optional: A map of extra parameters to add to the authorization token request.
4 The list of claims to use as the preferred user name when provisioning a user for this identity. The first non-empty claim is used.
5 The list of claims to use as the display name. The first non-empty claim is used.
6 The list of claims to use as the email address. The first non-empty claim is used.
7 The list of claims to use to synchronize groups from the OpenID Connect provider to OpenShift Container Platform upon user login. The first non-empty claim is used.
Additional resources

Adding an identity provider to your cluster

After you install your cluster, add an identity provider to it so your users can authenticate.

Prerequisites

  • Create an OpenShift Container Platform cluster.

  • Create the custom resource (CR) for your identity providers.

  • You must be logged in as an administrator.

Procedure

  1. Apply the defined CR:

    $ oc apply -f </path/to/CR>

    If a CR does not exist, oc apply creates a new CR and might trigger the following warning: Warning: oc apply should be used on resources created by either oc create --save-config or oc apply. In this case you can safely ignore this warning.

  2. Obtain a token from the OAuth server.

    As long as the kubeadmin user has been removed, the oc login command provides instructions on how to access a web page where you can retrieve the token.

    You can also access this page from the web console by navigating to (?) Help → Command Line Tools → Copy Login Command.

  3. Log in to the cluster, passing in the token to authenticate.

    $ oc login --token=<token>

    If your OpenID Connect identity provider supports the resource owner password credentials (ROPC) grant flow, you can log in with a user name and password. You might need to take steps to enable the ROPC grant flow for your identity provider.

    After the OIDC identity provider is configured in OpenShift Container Platform, you can log in by using the following command, which prompts for your user name and password:

    $ oc login -u <identity_provider_username> --server=<api_server_url_and_port>

  4. Confirm that the user logged in successfully, and display the user name.

    $ oc whoami

Configuring identity providers using the web console

Configure your identity provider (IDP) through the web console instead of the CLI.

Prerequisites

  • You must be logged in to the web console as a cluster administrator.

Procedure

  1. Navigate to Administration → Cluster Settings.

  2. Under the Configuration tab, click OAuth.

  3. Under the Identity Providers section, select your identity provider from the Add drop-down menu.

You can specify multiple IDPs through the web console without overwriting existing IDPs.