![]() ![]() This access token is then used in the request to the other service for authentication and authorization. OAuth 2.0, in contrast, mitigates this risk by having the client (the service initiating the request) request an access token from an authorization server. Further, because usernames and passwords often don’t have expiration dates, and because many people will (sadly) reuse these credentials across services, such a leak can expose a hole the size of a barn in a system’s security barrier. Did the headers get leaked in a log file? Did somebody forget to force HTTPS? One mistake and credentials are compromised. This means that each and every request between each and every service is a major potential security risk. The primary problem with HTTP Basic is that it sends the username and password with every request. It does this primarily by replacing the old scheme, HTTP Basic, with a token-based authentication scheme that greatly reduces the number of requests that expose sensitive access credentials. The goal of the OAuth 2.0 client credentials grant is to allow two automated services to interact securely. What Is the Client Credentials Grant Flow? If you would rather follow along by watching a video, check out the screencast below from our YouTube channel. In the next part of the tutorial, you will implement the same OAuth 2.0 client credentials grant using Spring WebClient. Instead, the WebFlux-based class, WebClient should be used. RestTemplate is deprecated, and while still widely used, should probably not be used for new code. You will see how to authenticate the client with Okta using the client credentials grant and how to exchange the client credentials for a JSON Web Token (JWT), which will be used in the requests to the secure server. After that, you will create a Spring Boot-based command-line client that uses Spring’s RestTemplate to make authenticated requests to the secure server. You will create a simple resource server that will be secured using Okta as an OAuth 2.0 and OpenID Connect (OIDC) provider. It is often used for processes such as CRON jobs, scheduled tasks, and other types of heavy background data processing. In this tutorial, you will learn about how to allow services to securely interoperate even when there is not an authenticated user, using the client credentials grant.įortunately, this grant type is more straightforward than the other user-focused grant types. Learn More About Spring Boot and Spring Security.Create a RestTemplate Command-Line Application.Add a Custom Scope to Your Authorization Server.Build a Secure OAuth 2.0 Resource Server with Spring Security.Intro to Spring Security 5 Core Classes.What Is the Client Credentials Grant Flow?.This is typically used by clients to access resources about themselves rather than to access a user’s resources. The Client Credentials grant type is used by clients to obtain an access token outside of the context of a user. The OAuth 2.0 docs describe the client credentials grant in this way: In contrast, the authorization code grant type is more common, for when an application needs to authenticate a user and retrieve an authorization token, typically a JWT, that represents the user’s identity within the application and defines the resources the user can access, and the actions the user can perform. This is a very common scenario-and yet, it’s often overlooked by tutorials and documentation online. The client credentials grant is used when two servers need to communicate with each other outside the context of a user. ![]()
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