There are no noticeable differences to the end user. This is attempted after a local login failure: If the user can authenticate remotely, the account is updated locally, and the user is logged in normally. If an existing user whose password has changed on the IDP, but not Drupal yet, logs in, the password hash stored locally will be updated.Whenever a request to get a token is made, the results are reported in the log. On failure, the user will still be logged in, but will not get a token. On success, the token will be added to the user's session. When an existing local user logs in, the module will attempt to get an access token for him/her.Otherwise, go with one that supports this already. If you're already using one that doesn't, you'll have to add that support. Once you've got this set up, you'll have to ensure that the Web-services client module you're using supports the OAuth2 protocol (i.e.Hit the Save configuration button to save your settings.If you subclassed OAuth2AuthenticationClient, replace the default class name in Miscellaneous Settings » Client Class with the name of your new class. They contain sane defaults, but look over all of it to make sure it's what you need for your set-up. This section is mandatory while the others are optional. Surf to the configuration page over at Home » Administration » Configuration » Web services » OAuth2 Authentication to configure your token endpoint. This is best done in a custom module for your site, something like Sitename Authentication ( sitename_authentication) where S/sitename is the name of your site. If you wish to override any of the methods in the OAuth2AuthenticationClient class to change the module's behaviour, create another class that extends it and implement the desired methods. Install and enable the OAuth2 Client and OAuth2 Authentication modules as you would any other. It also wouldn't hurt to study the official OAuth 2.0 Threat Model and Security Considerations. The problem with OAuth for Authentication.Why OAuth it self is not an authentication framework?.The following articles are on the subject are noteworthy. For example, I don't recommend running with this concept in a mobile environment as it can't be trusted to the same extent as a Drupal site behind a corporate firewall. If one doesn't control the environment in which it's running, then it shouldn't be used. The security implications of using this module should be well understood. In situations where one doesn't have access to an OpenID Connect server, but does have access to an IDP that speaks OAuth2 and can trust the environment in which all of it operates, this module is sufficient. It's essentially the evolution of SAML see my answer to Can OAuth 2 be used for SSO? Or do I need a more sophisticated authentication? for details. It provides a proper identity layer on top of OAuth2. Ideally, logging in users via OAuth2 should be done with OpenID Connect. Generally, one shouldn't make that assumption as OAuth2 is an authorization mechanism, not an authentication mechanism. In doing this, we're making the assumption that resource requesters are actually resource owners. If the user account doesn't exist yet, it will be created. That is, if a user's credentials can be used to retrieve a valid access token, he/she will be logged into the site with those credentials and the token will be added to his/her session. This module allows users to log into a Drupal site authenticating against a remote identity provider (IDP) via OAuth2. So I created the OAuth2 Authentication module. Although there have been some modules available in the ecosystem to support OAuth2, there weren't any available to provide this functionality. While I was there architecting a Drupal solution as their new Web platform, they wanted me to to hook into this system to authenticate their Drupal users. I recently had a client that began delegating access to all of its data assets across the enterprise network via OAuth, specifically the OAuth 2.0 protocol.
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