Configure the GeoServer OAuth2 filter

1. Start GeoServer and login to the web admin interface as the admin user.

2. Click the Authentication link located under the Security section of the navigation sidebar.

   

3. Scroll down to the Authentication Filters panel and click the Add new link.

   

4. Click the OAuth2 link.

   

5. Fill in the fields of the settings form as follows:

   

   The default values provided with the plugin are valid for the Google OAuth2 Provider and are the following:

   "Enable Redirect Authentication EntryPoint" = False
   "Access Token URI" = https://accounts.google.com/o/oauth2/token
   "User Authorization URI" = https://accounts.google.com/o/oauth2/auth
   "Redirect URI" = https://instance.geocat.live/geoserver
   "Check Token Endpoint URL" = https://www.googleapis.com/oauth2/v1/tokeninfo
   "Logout URI" = https://accounts.google.com/logout
   "Scopes" = https://www.googleapis.com/auth/userinfo.email,https://www.googleapis.com/auth/userinfo.profile
   

   Note

   1. Client ID and Client Secret are the ones Google provided

   2. Choose a Role Service able to recognize user emails as IDs. By default a connected user will have ROLE_USER role

   Warning

   A few words on the Enable Redirect Authentication EntryPoint option

   This option allows you to decide whether or not to force automatic redirection to OAuth2 Access Token URI or not for authentication.

   What does that mean?

   • Enable Redirect Authentication EntryPoint = True

     If not already authenticated (or no valid Access Token is provided in the query string), this option will force a redirection to the OAuth2 Provider Login page.

     This may cause unwanted behavior since it will override every other explicit login method like form. In other words if the filter is applied for instance to the web endpoint, it won’t be possible to access to the GeoServer Admin GUI using the standard login method via browser.

   • Enable Redirect Authentication EntryPoint = False

     In order to avoid the above issue, by disabling this option you will be forced to use an explicit Authentication Endpoint to login via the OAuth2 Provider login page.

     If not already authenticated (or no valid Access Token is provided in the query string), you must authenticate through the following URLs:

     1. GeoServer OAuth2 Authorization Endpoint; http://<host:port>/geoserver/j_spring_oauth2_login

     2. OAuth2 Provider Explicit User Authorization Endpoint; this must be adapted for your specific OAuth2 Provider, the protocol stated that it should be

        https://<USER_AUTHORIZATION_URI>?scope=<SCOPES>&response_type=code&redirect_uri=<REDIRECT_URI>&client_id=<CLIENT_ID>
        

        For Google OAuth2 Provider is:

        https://accounts.google.com/o/oauth2/auth?scope%3Dhttps://www.googleapis.com/auth/userinfo.email%2Bhttps://www.googleapis.com/auth/userinfo.profile%26response_type%3Dcode%26redirect_uri%3D<REDIRECT_URI>%26client_id%3D<CLIENT_ID>
        

6. Update the filter chains by adding the new OAuth2 filter.

   Once everything has been configured you should be able to see the new oauth2 filter available among the Authentication Filters list

   

   Through this it will be always possible to modify / update the filter options, or create more of them.

   The next step is to add the filter to the Filter Chains you want to protect with OAuth2 also

   

7. Select the OAuth2 Filter for each filter chain you want to protect with OAuth2.

   If you need to protect all the GeoServer services and the GeoServer Admin GUI too with OAuth2, you need to add the oauth2 filter to all the following chains

   • web

   • rest

   • gwc

   • default

   The order of the authentication filters depends basically on which method you would like GeoServer to try first.

   Note

   During the authentication process, the authentication filters of a Filter Chain are executed serially until one succeed (for more details please see the section Authentication chain)

   Warning

   If Enable Redirect Authentication EntryPoint = True for OAuth2 Filter, the web chain won’t be able to login through the form method.

   

   Note

   Remember that the anonymous filter must be always the last one.

8. Save.

   

It’s now possible to test the authentication:

1. Navigate to the GeoServer home page and log out of the admin account.

2. Try to login again, you should be able now to see the external Google login form.