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Explain how to implement custom authentication in Drupal.

Explain how to implement custom authentication in Drupal.

Answer: To implement custom authentication in Drupal, follow these steps:

1. Create a Custom Module: Start by creating a custom module. Define your module in the `.info.yml` file.

2. Implement Hook: Use `hook_user_login()` or `hook_auth()` to implement your custom authentication logic. You can also create a custom auth provider by implementing the `DrupaluserAuth` interface.

3. Define Authentication Logic: In your custom module, define the logic for authenticating users, which may involve checking user credentials against an external database or API.

4. Provide a Login Form: Implement a custom login form by extending `FormBase` and defining the necessary fields for user credentials.

5. Override User Session: Once authenticated, manage the user session using the Drupal user session management functions, like `user_save()` and `user_login_finalize()`.

6. Set Permissions: Adjust permissions in your module to manage access control for users authenticated through your custom system.

7. Testing: Thoroughly test the custom authentication to ensure it functions correctly and adheres to security standards.

8. Clear Cache: After making changes, clear the cache using `drush cr` or through the admin interface to ensure your changes are recognized by Drupal.

By following these steps, you can set up custom authentication tailored to your requirements in Drupal.

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