Configuring a Google identity provider - Configuring identity providers | Authentication

About identity providers in OpenShift Container Platform
Creating the secret
Sample Google CR
Adding an identity provider to your clusters

Configure a google identity provider using Google’s OpenID Connect integration.

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

Using Google as an identity provider allows any Google user to authenticate to your server. You can limit authentication to members of a specific hosted domain with the hostedDomain configuration attribute.

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
```

Sample Google CR

The following Custom Resource (CR) shows the parameters and acceptable values for a Google identity provider.

Google CR

apiVersion: config.openshift.io/v1
kind: OAuth
metadata:
  name: cluster
spec:
  identityProviders:
  - name: googleidp (1)
    mappingMethod: claim (2)
    type: Google
    google:
      clientID: {...} (3)
      clientsecret: (4)
        name: google-secret
      hostedDomain: "example.com" (5)

1	This provider name is prefixed to the Google numeric user ID 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 registered Google project. The project must be configured with a redirect URI of `https://oauth-openshift.apps.<cluster-name>.<cluster-domain>/oauth2callback/<idp-provider-name>`.
4	Reference to an OpenShift Container Platform secret containing the client secret issued by Google.
5	A hosted domain used to restrict sign-in accounts. Optional if the `lookup` `mappingMethod` is used. If empty, any Google account is allowed to authenticate.

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
```