Provide tutorial for OIDC Authentication with AWS ALB on Kubeflow

content/docs/aws/authentication-oidc.md

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+title = "Authentication using OIDC"
+description = "Authentication and authorization support through OIDC for Kubeflow in AWS"
+weight = 90
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+
+This section shows the how to setup Kubeflow with authentication and authorization support through OIDC in Amazon Web Services (AWS). Similar to [Cognito tutorial](/docs/aws/authentication/).
+
+## Enable TLS and Authentication
+
+Right now, certificates for ALB public DNS names are not supported. Instead, you must  prepare a custom domain. You can register your domain in Route53 or any domain provider such as [GoDaddy.com](https://www.godaddy.com/).
+
+[AWS Certificate Manager](https://aws.amazon.com/certificate-manager/) is a service that lets you easily provision, manage, and deploy public and private Secure Sockets Layer/Transport Layer Security (SSL/TLS) certificates for use with AWS services and your internal connected resources.
+
+To get TLS support from the ALB Ingress Controller, you need to follow [this tutorial](https://docs.aws.amazon.com/acm/latest/userguide/gs-acm-request-public.html) to request a certificate in AWS Certificate Manager. After successful validation, you will get a `certificate ARN` to use with the ALB Ingress Controller.
+
+> Note: Even you need to create a `certificate ARN`, we don't necessarily need a custom domain unless you want to use it, you can still use ALB ingress hostname to visit kubeflow central dashboard.
+
+<img src="/docs/images/aws/cognito-certarn.png"
+  alt="Cognito Certificate ARN"
+  class="mt-3 mb-3 border border-info rounded">
+
+[OIDC](https://openid.net/connect/) allows clients to verify the identity of the End-User based on the authentication performed by an Authorization Server. OIDC allows clients of all types, including Web-based, mobile, and JavaScript clients, to request and receive information about authenticated sessions and end-users. You can use any OIDC compatible solutions including Google, Facebook and Github for authentication. For this tutorial, we take Github Login as an example.
+
+In order to authenticate and manage users for Kubeflow, let's first connect Auth0 app to Github. You can follow instructions [here](https://auth0.com/docs/connections/social/github) or follow below detailed steps:
+
+### 1. Register Your New App on Auth0
+You should go to the [Auth0 page](https://manage.auth0.com/) to sign up and login at first.
+
+<img src="/docs/images/aws/auth0-login.png"
+  alt="Auth0 Login"
+  class="mt-3 mb-3 border border-info rounded">
+
+Then you can look at below page and modify the domain name Under `TENANT DOMAIN` to be your preferable domain name and take notes.
+
+<img src="/docs/images/aws/auth0-welcome-page.png"
+  alt="Auth0 Welcome Page"
+  class="mt-3 mb-3 border border-info rounded">
+
+After modification, click **NEXT** button. Then you can set up your personal information there and click **CREATE ACCOUNT** button.
+
+### 2. Add a new Application in Github
+To add a new application, log in to [GitHub](https://github.com/) and go to **OAuth Apps** in your [developer settings](https://github.com/settings/developers). Next click [Register a new application](https://github.com/settings/applications/new).
+
+<img src="/docs/images/aws/github-oauth-app-register.png"
+  alt="Github Oauth App Register"
+  class="mt-3 mb-3 border border-info rounded">
+
+### 3. Register Your New App on Github
+On the [Register a new application](https://github.com/settings/applications/new) page fill out the form with the following information. Modify the parameters to reflect your application.
+
+In step 1, you registered new app on Auth0 and there's a `TENANT DOMAIN`. Now it is your Github Homepage URL with prefix of `https://`. For example, if your Auth0 tenant domain was `kftest.auth0.com`, your Github Homepage URL would be `https://kftest.auth0.com` and your redirect URL would be `https://kftest.auth0.com/login/callback`.
+
+<img src="/docs/images/aws/github-oauth-app-register-details.png"
+  alt="Github Oauth App Register Details"
+  class="mt-3 mb-3 border border-info rounded">
+
+After completing the form click **Register application** to proceed.
+
+### 4. Configure Github and Auth0 app
+Once the application is registered, your app's `Client ID` and `Client Secret` will be displayed on the following page:
+
+<img src="/docs/images/aws/github-oauth-app-client-id-secret.png"
+  alt="Github Oauth App Client ID Secret"
+  class="mt-3 mb-3 border border-info rounded">
+
+Go to your [Auth0 Dashboard](https://manage.auth0.com/dashboard/), after log into Auth0 Dashboard, select **Connections > Social**, then choose Github. Copy the `Client ID` and `Client Secret` from the `Developer Applications` of your app on Github into the fields on this page on Auth0.
+
+<img src="/docs/images/aws/auth0-github-setup.png"
+  alt="Auth0 Github Setup"
+  class="mt-3 mb-3 border border-info rounded">
+
+Then click **SAVE** button and go to the [Auth0 Dashboard](https://manage.auth0.com/dashboard/), take a note about the `Client ID` and `Client Secret`, which are found on your Auth0 application. 
+
+<img src="/docs/images/aws/auth0-app-client-id-secret.png"
+  alt="Auth0 App ClienID and ClientSecret"
+  class="mt-3 mb-3 border border-info rounded">
+
+### 5. Deploy Kubeflow
+
+Download [{{% config-file-aws-cognito %}}]({{% config-uri-aws-cognito %}}). Before you `kfctl apply -V -f {{% config-file-aws-cognito %}}`, please update **spec** and **repos** fields in your Kubeflow configuration file at `{{% config-file-aws-cognito %}}`, so that it looks like this:
+```
+plugins:
+- kind: KfAwsPlugin
+  metadata:
+    name: aws
+  spec:
+    auth:
+      oidc:
+        certArn: arn:aws:acm:us-west-2:########:certificate/#######-#####-###-#
+        oAuthClientId: Your Auth0 App Client Id
+        oAuthClientSecret: Your Auth0 App Client Secret
+        oidcAuthorizationEndpoint: https://kftest.auth0.com/authorize
+        oidcIssuer: https://kftest.auth0.com/
+        oidcTokenEndpoint: https://kftest.auth0.com/oauth/token
+        oidcUserInfoEndpoint: https://kftest.auth0.com/userinfo
+      region: us-west-2
+      enablePodIamPolicy: true
+  repos:
+  - name: manifests
+    uri: https://github.com/kubeflow/manifests/archive/v1.0-branch.tar.gz
+```
+
+After you finish the TLS and Authentication configuration, then you can run `kfctl apply -V -f {{% config-file-aws-cognito %}}`.
+
+After a while, your ALB will be ready, you can get ALB hostname by running follow command.
+
+```
+kubectl get ingress istio-ingress -n istio-system
+NAME            HOSTS   ADDRESS                                                                 PORTS   AGE
+istio-ingress   *       322ac077-istiosystem-istio-2af2-786120677.us-west-2.elb.amazonaws.com   80      56s
+```
+
+On Auth0 dashboard, click `Applications` on the left navigation bar, modify your ALB Hostname with prefix `https://` and postfix `/oauth2/idpresponse` in `Allowed Callback URLs` as below image:
+
+<img src="/docs/images/aws/auth0-callback-url.png"
+  alt="Auth0 App Callback URL"
+  class="mt-3 mb-3 border border-info rounded">
+
+## Succeed example
+
+After you set up above steps, navigate the application from `https://Your ALB HostName` and you'll see a webpage like below:
+
+<img src="/docs/images/aws/alb-login.png"
+  alt="ALB Hostname Login"
+  class="mt-3 mb-3 border border-info rounded">
+
+After you login with Github, you should succeed in seeing a kubeflow dashboard webpage.