README

This extension lets you authenticate frontend users against an OpenID Connect provider.

Examples of such identity provider software or services are:

• Microsoft EntraID
• Google
• GitHub
• ID Austria
• WSO2 Identity Server
• Keycloak
• Authentik

Pre-configuration for Swiss Alpine Club

The extension is preconfigured to work with the WSO2 Identity Server from the Swiss Alpine Club, but may be used with any OpenID Connect identity server as well.

If you are a Swiss Alpine Club section, be sure to get in touch with Bern in order to get your dedicated private key and secret.

Default frontend login box

This extension integrates with the system extension 'felogin', if it is installed.

This Fluid markup can be used to include a link to the authentication endpoint of the identity provider.

<f:if condition="{openidConnectUri}">
    <f:then>
        <a href="{openidConnectUri}" rel="nofollow" class="btn btn-default"><span class="fa fa-openid"></span> OpenID Connect</a>
    </f:then>
    <f:else>
        Invalid OpenID Connect configuration
    </f:else>
</f:if>

See also Resources/Private/Templates/Login/Login.html as reference.

Direct OIDC Login

If OpenID Connect is your only means of frontend login, you can use the included "OIDC Login" plugin. Add it to your login page, where you would normally add the felogin box. After adding the OIDC Login plugin, requests to the login page will immediately be redirected to the identity provider.

After the login process, the user will be redirected:

• The OIDC Login supports the same redirect_url parameter as the felogin box
• If no parameter is set, OIDC Login will redirect the user to the page configured at plugin.tx_oidc_login.defaultRedirectPid.
• If that configuration is not set either, the user will be redirected to '/'.

PKCE (Proof of Key for Code Exchange)

If your OIDC Login supports Proof of Key for Code Exchange you can enable it by checking enableCodeVerifier in the extension configuration. A shared secret will be sent along preventing Authorization Code Interception Attacks. See https://tools.ietf.org/html/rfc7636 for details.

Configuration

Mapping Frontend User Fields

• Configuration is done through TypoScript within plugin.tx_oidc.mapping.fe_users

• OIDC attributes will be recognized by the specific characters <>:

  email = <mail>
  

• You may combine multiple markers as well, e.g.,

  name = <family_name>, <given_name>
  

• Support for stdWrap in field definition, e.g.,

  name = <name>
  name.wrap = |-OIDC
  

• Support for TypoScript "split" (//). This will check multiple field names and return the first one yielding some non-empty value. E.g.,

  username = <sub> // <contact_number> // <emailaddress> // <benutzername>
  

Mapping Frontend User Groups

• Create your groups within TYPO3
• Use the additional pattern to relate it to roles within OpenID Connect
• Local TYPO3 groups (not related to some role) will be kept upon authenticating
• Default TYPO3 group(s) as configured in Extension Manager will always be added

OIDC Login

• plugin.tx_oidc_login.defaultRedirectPid UID of the page that users will be redirected to, if no redirect_url parameter is set.

Logging

This extension makes use of the Logging system introduced in TYPO3 CMS 6.0. It is far more flexible than the old one writing to the "sys_log" table. Technical details may be found in the TYPO3 Core API.

As an administrator, what you should know is that the TYPO3 Logger forwards log records to "Writers", which persist the log record.

By default, with a vanilla TYPO3 installation, messages are written to the default log file (var/log/typo3_*.log).

Dedicated Log File for OpenID Connect

If you want to redirect every logging information from this extension to var/log/oidc.log and send log entries with level "WARNING" or above to the system log, you may add following configuration to typo3conf/AdditionalConfiguration.php:

$GLOBALS['TYPO3_CONF_VARS']['LOG']['Causal']['Oidc']['writerConfiguration'] = [
    \TYPO3\CMS\Core\Log\LogLevel::DEBUG => [
        \TYPO3\CMS\Core\Log\Writer\FileWriter::class => [
            'logFileInfix' => 'oidc'
        ],
    ],

    // Configuration for WARNING severity, including all
    // levels with higher severity (ERROR, CRITICAL, EMERGENCY)
    \TYPO3\CMS\Core\Log\LogLevel::WARNING => [
        \TYPO3\CMS\Core\Log\Writer\SyslogWriter::class => [],
    ],
];

Hint: Be sure to read Configuration of the Logging system to fine-tune your configuration on any production website.

Using additional identity provider packages

The underlying PHP library for OAuth2 can be extended for specific identity providers by adding additional packages.

Example: For Microsoft EntraID (Azure) the package is thenetworg/oauth2-azure

In order to use these kinds of packages, one needs to implement a custom OAuth2ProviderFactory, which takes care of initializing the specific provider.

Here is an example for the aforementioned Azure package:

<?php

declare(strict_types=1);

namespace Reelworx\Sitesetup\Authentication;

use Causal\Oidc\Factory\OAuthProviderFactoryInterface;
use League\OAuth2\Client\Provider\AbstractProvider;
use TheNetworg\OAuth2\Client\Provider\Azure;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/* requires some ENV variables to be set, see below */
final class OAuth2ProviderFactory implements OAuthProviderFactoryInterface
{
    public function create(array $settings): AbstractProvider
    {
        $options = [
            'clientId' => $settings['oidcClientKey'],
            'redirectUri' => $settings['oidcRedirectUri'],
            'urlAuthorize' => $settings['oidcEndpointAuthorize'],
            'urlAccessToken' => $settings['oidcEndpointToken'],
            'urlResourceOwnerDetails' => $settings['oidcEndpointUserInfo'],
            'scopes' => GeneralUtility::trimExplode(',', $settings['oidcClientScopes'], true),
            'defaultEndPointVersion' => Azure::ENDPOINT_VERSION_2_0,
            'tenant' => getenv('AZURE_OAUTH_CLIENT_TENANT'),
        ];
        if ($settings['oidcClientSecret']) {
            $options['clientSecret'] = $settings['oidcClientSecret'];
        } else {
            // https://learn.microsoft.com/en-us/entra/identity-platform/certificate-credentials
            // PEM certificate (newline potentially encoded as '\n'
            $options['clientCertificatePrivateKey'] = getenv('AZURE_OAUTH_CLIENT_CERTIFICATE');
            // SHA-1 thumbprint of the X.509 certificate's DER encoding.
            $options['clientCertificateThumbprint'] = getenv('AZURE_OAUTH_CLIENT_CERTIFICATE_THUMBPRINT');
        }
        return new Azure($options);
    }
}

Migration from v2 to v3

Version 3 has developed to a major rewrite of the extension. It gets rid of extbase dependencies, handles things as early as possible (middleware) and streamlines a lot of code.

Please refer to the CHANGELOG.md for further details.

Credits

This TYPO3 extension is created and maintained by:

• Xavier Perseguers (https://www.causal.ch/)
• Markus Klein (https://reelworx.at/)

A big "Thanks" goes out to all contributors.