Session information are not stored in the private tempstore when a user logs in.

Created on 4 December 2023, 12 months ago
Updated 19 April 2024, 7 months ago

Problem/Motivation

When a user connects with a keycloak plugin, session information is not stored in the private tempstore.
Without this information, it is not possible to use the refreshToken to check the validity of the user's session.

Steps to reproduce

  • Log in with a user
  • Try to retrieve his information
$keycloak = \Drupal::service('keycloak.keycloak');
$sessionInfo = $keycloak->getSessionInfo();
dump($sessionInfo);
[
  "access_token" => null
  "refresh_token" => null
  "id_token" => null
  "client_id" => null
  "session_id" => null
]

Proposed resolution

This problem has two distinct sources in the code.

First issue

The first problem comes from the keycloak_openid_connect_post_authorize() hook, which does not correctly check the openid_connect plugin used.

if (empty($plugin_id) || $plugin_id !== 'keycloak') {
  // Nothing to do. Bail out.
  return;
}

At this point, the hook performs a check on the plugin identifier, which corresponds to 'keycloak'.
But in reality, this id corresponds to the machine name of the plugin, which is not necessarily 'keycloak'.

To improve this check, we could base it on the plugin class corresponding to this plugin id:

  1. Load the client.
  2. Retrieve the plugin.
  3. Check against the plugin instance.

Second issue

Once the hook has run successfully, processing ends with the 'keycloak.keycloak' service storing the session information.

// Whether the user is not authenticated or the Keycloak client disabled.
if (!$this->currentUser->isAuthenticated() || !$this->isEnabled()) {
  return FALSE;
}

At this point, the service checks whether the keycloak plugin is enabled in the configuration file.

  • The service loads a configuration file that doesn't necessarily exist - if the plugin doesn't have the machine name keycloak
  • The method that checks whether the plugin is activated does not use the correct key.

The correction can be made in two ways:

1. Remove the check on the active status of the plugin.

I would opt for this solution for two reason:
First, I'm not sure that this check is really necessary. In fact, the service is called in a hook that is necessarily triggered by an active Keycloak plugin - whatever the instance.
Second, There is no need to correct the function KeycloakService::isCheckSessionEnabled(), which would cause an error when the keycloak_page_attachments_alter() is triggered. (This hook crashed on the first condition, which checks the tempstore data, and now it would crash on the second condition, which checks whether the plugin is active).

2. Allow the KeycloakService::setSessionInfo() function to accept the plugin_id as a parameter, so that the corresponding configuration file can be dynamically loaded into the service and checked.

Remaining tasks

I propose a patch that makes a correction in line with the above analysis.

There are still a few problems in the module linked to this configuration file, which is hard-coded in the service.
We still need to implement a method for checking sessions that no longer pass through an iFrame.

🐛 Bug report
Status

Needs review

Version

2.2

Component

Code

Created by

🇫🇷France zewebmaster Nantes

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