Configuring a Google identity provider

Configuring a Google identity provider

Configure the google identity provider using the Google OpenID Connect integration.

About identity providers in OKD

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.

OKD user names containing /, :, and % are not supported.

About Google authentication

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.

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

Creating the secret

Identity providers use OKD 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
```

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 OKD `Secret` object 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.

Additional resources

See Identity provider parameters for information on parameters, such as mappingMethod, that are common to all identity providers.

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 OKD 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
```