Configuring an OpenID Connect identity provider - Configuring identity providers | Authentication

About identity providers in OpenShift Container Platform
Creating the Secret
Creating a configmap
Sample OpenID Connect CRs
Adding an identity provider to your clusters
Configuring identity providers using the web console

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.

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 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. The certificate authority must be stored in the ca.crt key of the configmap.
```
$ oc create configmap ca-config-map --from-file=ca.crt=/path/to/ca -n openshift-config
```

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
      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

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.

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.
Log in to the cluster, passing in the token to authenticate.
```
$ oc login --token=<token>
```
This identity provider does not support logging in with a user name and password.
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.