# WSO2 Identity Server as IDP for OIDC-SSO

To set up the IDP you need a running instance of WSO2 Identity Server with a configurable realm.

# Preamble

The Enterprise Edtion (EE) server and client support the OIDC protocol that allows you to configure an external service as IDP (identity provider) for SSO (single sign on). This guide here will explain how to configure WSO2 Identity Server as OIDC-IDP for SSO. We assume that:

  • your WSO2 Identity Server instance is running on https://wso2.example.com,
  • your webclient can be accessed on https://psono.example.com
  • the server is reachable at https://psono.example.com/server (e.g. https://psono.example.com/server/info/ shows you some nice json output).

This is your first OIDC provider that you want to configure (therefore we give it the ID "1").

TIP

This feature is only available in the Enterprise Edition.

# WSO2 Identity Server

  1. Navigate to Service Providers and click on Add.

  2. Enter a nice name and description

    Name and describe Service provider

  3. Configure claims as shown below

    Name and describe Service provider

  4. Configure OpenID Connect

    Click on Configure

  5. Adjust config

    Enter https://psono.example.com/server/oidc/1/callback/ as your callback url. Adjust the domain according to your setup.

    Click on Configure

  6. Copy OAuth Client Key and OAuth Client Secret

    We will need these two parameters later.

    Copy WSO2 Client key and secret

# Server (settings.yaml)

After setting up the IDP for the OIDC-Authentication it is time to configure your running Psono-Server to act as the SP. It is required that Psono can reach WSO2 Identity Server and vise versa.

Edit the settings.yml like so:

# Make sure the 'OIDC'-entry is present in the following list
AUTHENTICATION_METHODS: ['OIDC']

OIDC_CONFIGURATIONS:
    1:
        OIDC_RP_SIGN_ALGO: 'RS256'
        OIDC_RP_CLIENT_ID: '9ydFzCGsjR5_fkaWuBij3S8OfWga'
        OIDC_RP_CLIENT_SECRET: 'Z_1hBkB7QCU71XiPhfcI7bzTCksa'
        OIDC_USERNAME_ATTRIBUTE: 'sub'
        OIDC_OP_JWKS_ENDPOINT: 'https://wso2.example.com/oauth2/jwks'
        OIDC_OP_AUTHORIZATION_ENDPOINT: 'https://wso2.example.com/oauth2/authorize'
        OIDC_OP_TOKEN_ENDPOINT: 'https://wso2.example.com/oauth2/token'
        OIDC_OP_USER_ENDPOINT: 'https://wso2.example.com/oauth2/userinfo?schema=openid'
  • Replace OIDC_RP_CLIENT_ID and OIDC_RP_CLIENT_SECRET with the Client key and secret
  • Replace the domain of all OIDC_OP_...-parameters to match your domain

TIP

Always restart the server after making changes in the setting.yml-file.

# Client (config.json)

Now you have to configure your client, so your users can use this configured IDP.

Update your config.json similar to the one shown below.

{
  ...
    "authentication_methods": ["OIDC"],
    "oidc_provider": [{
      "title": "OIDC Login",
      "provider_id": 1,
      "button_name": "Login "
    }]
  ...
}

The variable authentication_methods restricts the allowed login methods. In the example above only OIDC will be allowed and the normal login "hidden". The title and button_name can be adjusted however you like. The provider_id needs to match the one that you used on your server.