For our new friends:

Logto is an Auth0 alternative designed for modern apps and SaaS products. It offers both Cloud and Open-source services to help you quickly launch your identity and management (IAM) system. Enjoy authentication, authorization, and multi-tenant management all in one.

We recommend starting with a free development tenant on Logto Cloud. This allows you to explore all the features easily.

In this article, we will go through the steps to quickly build the OIDC sign-in experience (user authentication) with WordPress plugin and Logto.

Prerequisites

• A running Logto instance. Check out the introduction page to get started.
• Basic knowledge of WordPress plugin.
• A usable OIDC account.

Create an application in Logto

Logto is based on OpenID Connect (OIDC) authentication and OAuth 2.0 authorization. It supports federated identity management across multiple applications, commonly called Single Sign-On (SSO).

To create your Traditional web application, simply follow these steps:

1. Open the Logto Console. In the "Get started" section, click the "View all" link to open the application frameworks list. Alternatively, you can navigate to Logto Console > Applications, and click the "Create application" button.
2. In the opening modal, click the "Traditional web" section or filter all the available "Traditional web" frameworks using the quick filter checkboxes on the left. Click the "WordPress" framework card to start creating your application.
3. Enter the application name, e.g., "Bookstore," and click "Create application".

🎉 Ta-da! You just created your first application in Logto. You'll see a congrats page which includes a detailed integration guide. Follow the guide to see what the experience will be in your application.

Integrate WordPress with Logto

Install the plugin

info:

At the moment, our plugin is still under review and not available in the WordPress plugin directory. We'll update this page once it's available.

From upload

1. Download the Logto WordPress plugin from one of the following links:
   • Latest release: Download the file which name in the format of logto-plugin-<version>.zip.
2. Download the plugin ZIP file.
3. Go to Plugins > Add New in your WordPress admin panel.
4. Click Upload Plugin.
5. Select the downloaded ZIP file and click Install Now.
6. Click Activate.

Configure the plugin

Now you should be able to see the Logto menu in your WordPress admin panel sidebar. Click Logto > Settings to configure the plugin.

note:

You should have a traditional web application created in Logto Console before configuring the plugin. If you haven't created one, please refer to Integrate Logto into your application for more information.

The minimum configuration to get started for the plugin is:

• Logto endpoint: The endpoint of your Logto tenant.
• App ID: The app ID of your Logto application.
• App secret: One of the valid app secrets of your Logto application.

All values can be found on the application details page in Logto Console.

After filling in the values, click Save Changes (scroll down to the bottom of the page if you can't find the button).

Configure redirect URI

The redirect URI is the URL to which Logto will redirect users after they have authenticated; and the post sign-out redirect URI is the URL to which Logto will redirect users after they have logged out.

Here's a non-normative sequence diagram to illustrate the sign-in flow:

Here's how the sign-out flow looks like in a non-normative sequence diagram:

To learn more about why redirect is needed, see Sign-in experience explained.

In our case, we need to configure both redirect URIs in your Logto Console. To find the redirect URI, go to the Logto > Settings page in your WordPress admin panel. You'll see the Redirect URI and Post sign-out redirect URI fields.

1. Copy the Redirect URI and Post sign-out redirect URI values and paste them into the Redirect URIs and Post sign-out redirect URIs fields in your Logto Console.
2. Click Save changes in Logto Console.

Checkpoint: Test your WordPress website

Now you can test your Logto integration in your WordPress website:

1. Open an incognito browser window if needed.
2. Visit your WordPress website and click the Log in link if applicable; or directly visit the login page (e.g., https://example.com/wp-login.php).
3. The page should redirect you to the Logto sign-in page.
4. Complete the sign-in or sign-up process.
5. After successful authentication, you should be redirected back to your WordPress website and logged in automatically.
6. Click the Log out link to log out of your WordPress website.
7. You should be redirected to the Logto sign-out page, then back to your WordPress website.
8. You should be logged out of your WordPress website.

To learn more about the WordPress plugin settings, see WordPress quick start.

Add OIDC connector

To enable quick sign-in and improve user conversion, connect with WordPress as an identity provider. The Logto social connector helps you establish this connection in minutes by allowing several parameter inputs.

To add a social connector, simply follow these steps:

1. Navigate to Console > Connectors > Social Connectors.
2. Click "Add social connector" and select "OIDC".
3. Follow the README guide and complete required fields and customize settings.

note:

If you are following the in-place Connector guide, you can skip the next section.

Set up Standard OIDC app

Create your OIDC app

When you open this page, we believe you already know which social identity provider you want to connect to. The first thing to do is to confirm that the identity provider supports the OIDC protocol, which is a prerequisite for configuring a valid connector. Then, follow the identity provider's instructions to register and create the relevant app for OIDC authorization.

Configure your connector

We ONLY support "Authorization Code" grant type for security consideration and it can perfectly fit Logto's scenario.

clientId and clientSecret can be found at your OIDC apps details page.

clientId: The client ID is a unique identifier that identifies the client application during registration with the authorization server. This ID is used by the authorization server to verify the identity of the client application and to associate any authorized access tokens with that specific client application.

clientSecret: The client secret is a confidential key that is issued to the client application by the authorization server during registration. The client application uses this secret key to authenticate itself with the authorization server when requesting access tokens. The client secret is considered confidential information and should be kept secure at all times.

tokenEndpointAuthMethod: The token endpoint authentication method is used by the client application to authenticate itself with the authorization server when requesting access tokens. To discover supported methods, consult the token_endpoint_auth_methods_supported field available at the OAuth 2.0 service provider’s OpenID Connect discovery endpoint, or refer to the relevant documentation provided by the OAuth 2.0 service provider.

clientSecretJwtSigningAlgorithm (Optional): Only required when tokenEndpointAuthMethod is client_secret_jwt. The client secret JWT signing algorithm is used by the client application to sign the JWT that is sent to the authorization server during the token request.

scope: The scope parameter is used to specify the set of resources and permissions that the client application is requesting access to. The scope parameter is typically defined as a space-separated list of values that represent specific permissions. For example, a scope value of "read write" might indicate that the client application is requesting read and write access to a user's data.

You are expected to find authorizationEndpoint, tokenEndpoint, jwksUri and issuer as OpenID Provider's configuration information. They should be available in social vendor's documentation.

authenticationEndpoint: This endpoint is used to initiate the authentication process. The authentication process typically involves the user logging in and granting authorization for the client application to access their resources.

tokenEndpoint: This endpoint is used by the client application to obtain an id token that can be used to access the requested resources. The client application typically sends a request to the token endpoint with a grant type and authorization code to receive an id token.

jwksUri: This is the URL endpoint where the JSON Web Key Set (JWKS) of the social identity provider (IdP for short) can be obtained. The JWKS is a set of cryptographic keys that the IdP uses to sign and verify JSON Web Tokens (JWTs) that are issued during the authentication process. The jwksUri is used by the relying party (RP) to obtain the public keys used by the IdP to sign the JWTs, so the RP can verify the authenticity and integrity of the JWTs received from the IdP.

issuer: This is the unique identifier of the IdP that is used by the RP to verify the JWTs received from the IdP. It is included in the JWTs as the iss claim (Id token is always a JWT). The issuer value should match the URL of the IdP's authorization server, and it should be a URI that the RP trusts. When the RP receives a JWT, it checks the iss claim to ensure that it was issued by a trusted IdP, and that the JWT is intended for use with the RP.

Together, jwksUri and issuer provide a secure mechanism for the RP to verify the identity of the end-user during the authentication process. By using the public keys obtained from the jwksUri, the RP can verify the authenticity and integrity of the JWTs issued by the IdP. The issuer value ensures that the RP only accepts JWTs that were issued by a trusted IdP, and that the JWTs are intended for use with the RP.

Since an authentication request is always required, an authRequestOptionalConfig is provided to wrap all optional configs, you can find details on OIDC Authentication Request. You may also find that nonce is missing in this config. Since nonce should identical for each request, we put the generation of nonce in code implementation. So do not worry about it! Previously mentioned jwksUri and issuer are also included in idTokenVerificationConfig.

You may be curious as to why a standard OIDC protocol supports both the implicit and hybrid flows, yet the Logto connector only supports the authorization flow. It has been determined that the implicit and hybrid flows are less secure than the authorization flow. Due to Logto's focus on security, it only supports the authorization flow for the highest level of security for its users, despite its slightly less convenient nature.

responseType and grantType can ONLY be FIXED values with "Authorization Code" flow, so we make them optional and default values will be automatically filled.

note:

For all flow types, we provided an OPTIONAL customConfig key to put your customize parameters. Each social identity provider could have their own variant on OIDC standard protocol. If your desired social identity provider strictly stick to OIDC standard protocol, the you do not need to care about customConfig.

Config types

Name	Type	Required
scope	string	True
clientId	string	True
clientSecret	string	True
authorizationEndpoint	string	True
tokenEndpoint	string	True
idTokenVerificationConfig	IdTokenVerificationConfig	True
authRequestOptionalConfig	AuthRequestOptionalConfig	False
customConfig	Record<string, string>	False

AuthRequestOptionalConfig properties	Type	Required
responseType	string	False
tokenEndpoint	string	False
responseMode	string	False
display	string	False
prompt	string	False
maxAge	string	False
uiLocales	string	False
idTokenHint	string	False
loginHint	string	False
acrValues	string	False

IdTokenVerificationConfig properties	Type	Required
jwksUri	string	True
issuer	string | string[]	False
audience	string | string[]	False
algorithms	string[]	False
clockTolerance	string | number	False
crit	Record<string, string | boolean>	False
currentDate	Date	False
maxTokenAge	string | number	False
subject	string	False
typ	string	False

See here to find more details about IdTokenVerificationConfig.

Save your configuration

Double check you have filled out necessary values in the Logto connector configuration area. Click "Save and Done" (or "Save changes") and the OIDC connector should be available now.

Enable OIDC connector in Sign-in Experience

Once you create a social connector successfully, you can enable it as a "Continue with OIDC" button in Sign-in Experience.

1. Navigate to Console > Sign-in experience > Sign-up and sign-in.
2. (Optional) Choose "Not applicable" for sign-up identifier if you need social login only.
3. Add configured OIDC connector to the "Social sign-in" section.

Testing and Validation

Return to your WordPress plugin app. You should now be able to sign in with OIDC. Enjoy!

Further readings

End-user flows: Logto provides a out-of-the-box authentication flows including MFA and enterprise SSO, along with powerful APIs for flexible implementation of account settings, security verification, and multi-tenant experience.

Authorization: Authorization defines the actions a user can do or resources they can access after being authenticated. Explore how to protect your API for native and single-page applications and implement Role-based Access Control (RBAC).

Organizations: Particularly effective in multi-tenant SaaS and B2B apps, the organization feature enable tenant creation, member management, organization-level RBAC, and just-in-time-provisioning.

Customer IAM series Our serial blog posts about Customer (or Consumer) Identity and Access Management, from 101 to advanced topics and beyond.