Configure an oidc identity provider to integrate with an OpenID Connect identity provider using an Authorization Code Flow.

You can configure Red Hat Single Sign-On as an OpenID Connect identity provider for OpenShift Container Platform.

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 standard claims are:

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.

Using an OpenID Connect identity provider requires users to get a token using <master>/oauth/token/request to use with command-line tools.

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.

Creating the Secret

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

  • You can define an OpenShift Container Platform Secret containing a string by using the following command.

    $ oc create secret generic <secret_name> --from-literal=clientSecret=<secret> -n openshift-config
  • You can define an OpenShift Container Platform Secret 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 ConfigMap

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

  • Define an OpenShift Container Platform ConfigMap containing the certificate authority by using the following command.

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

Sample OpenID Connect CRs

The following Custom Resource (CR)s shows 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
      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 Reference to an OpenShift Container Platform Secret containing the client secret.
5 List of claims to use as the identity. First non-empty claim is used. At least one claim is required. If none of the listed claims have a value, authentication fails. For example, this uses the value of the sub claim in the returned id_token as the user’s identity.
6 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
      issuer: https://www.idp-issuer.com
1 Optional: Reference to an OpenShift Container Platform ConfigMap containing the PEM-encoded certificate authority bundle to use in validating server certificates for the configured URL.
2 Optional list of scopes to request, in addition to the openid scope, during the authorization token request.
3 Optional map of extra parameters to add to the authorization token request.
4 List of claims to use as the preferred user name when provisioning a user for this identity. First non-empty claim is used.
5 List of claims to use as the display name. First non-empty claim is used.
6 List of claims to use as the email address. First non-empty claim is used.

Adding an identity provider to your clusters

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>
  2. Log in to the cluster as a user from your identity provider, entering the password when prompted.

    $ oc login -u <username>
  3. 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 AdministrationCluster Settings.

  2. Under the Global 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.