Let's get into the details of the implementation of this approach. This step is very important because the client will always come with this X-AUTH-TOKEN parameter which contains a token for each HTTP request. for implementing stateless authentication and today we will be focus on "Server Signed Token" approach that may be life-saving for your implementations. We didn’t impact our API contract at all.

The common best practice of that is to respond to this token in the header of the HTTP reponse with a parameter name which is called "X-AUTH-TOKEN". Spring provides an "AbstractAuthenticationProcessingFilter" which is used for authentication. Let’s build a better solution.

If we think about the meaning of authentication, it seems that it is all about a client identifying itself to the server. When the server creates the token, this token should be told to the client in the HTTP response. In this article, I want to focus on how to deal with automatic re-authentication of each HTTP and HTTPS requests. The basic idea behind a stateless authentication is that the user authenticates against your application, if the operation is successful the server will respond with a token that the user should send on any request using an Http Header or a Cookie to prove his identity (for our article we will use Http Headers). With this configuration in place the user can reach out different backend servers transparently without having the need to reauthenticate.


To answer that question, let’s examine a fundamental challenge in building APIs that are both re-usable and easy to consume.

After the token handshake is done, when the client makes a request to the server, Auth Filter will be called.

Now let’s define our JwtAuthenticationTokenFilter, this filter intercept all user’s requests and look for the Token in Authorization request header, if it exist it will be checked for validity then decide to authorize the request or deny it.

Before we begin coding let’s first define our dependencies and what we will need to build our application.

The working style of the auth filter is very easy because the only job it needs to do is get the X-AUTH-TOKEN value from the request header and get the user object from the cache server. Yep. For our first project, here’s a pom.xml skeleton to get us started: Let’s also define an entry point for our application: Let’s also add some security configuration to our project for example purposes. Spring Boot Series.

But what if there was a better way to share sessions within a microservices architecture? We’ll need this to do reverse-proxy functions. You may be tempted to say “Let’s just delegate that job to some third-party system, vendor, or platform solution, such as the PCF go-router.” Note: This tutorial was built using Spring Boot 2.0.4.RELEASE. The full source code of this tutorial can be found on GitHub . Whatever authentication scheme you are using should work fine here.

Spring Boot Series. On the other side the server also needs to validate our token and verify if still valid, not expired and nobody tampered with it. There are several approaches such as OAUTH1, OAUTH2, Basic Authentication, etc. The full source code of this tutorial can be found on GitHub In attemptAuthentication method, the aim is to create an Authentication object (org.springframework.security.core.Authentication) that stores the authorities, credentials, details, principal object, and authenticationResult.

For example, in the cloud you may have a completely different authentication scheme than in the on-premise solution, or your frontend may have very different needs in each case. In the previous article, we discussed how to build a custom permissions system.In this article, we’ll discuss how to use Zuul’s reverse-proxy functionality to propagate session information in a stateless way. Make session management completely transparent to the API consumer. The first thing to notice is that it takes no parameters. Oh, and building great software. Each microservice will just act as if it owns the session, or at least a read-only copy of it, and load it into memory on each request, perhaps from a database or a key-value data store. Remember that this security configuration is just an example.

Then, if you can somehow manage to have the JWTs sent to each microservice along with the request, you still have to manage shared secret keys to decode the payload, not to mention the possible size of the payload in JSON format. Also, for any other requests the "Auth Filter" will be called before each request is processed.

The client only uses this token for further requests. Spring Boot Series.

Each microservice will be fully session-aware and yet require no setup or overhead.

If the attemptAuthentication method throws a UserAuthenticationException the unsuccessfullAuthentication method is called, otherwise the successfullAuthentication method will be called. And here is another Controller to test things out. Of course, the answer is the API Gateway pattern.

Stateless authentication means that we don’t want to store the authentication state of a user on the server, aka session. Bear with me…. For example, perhaps you’ll implement an SSO using OAuth with JWTs.

In the session-based approcah, a session id—which is a kind of server generated token—is generated and stored in a cookie within the JSESSIONID paramter. To perform this task spring session creates a SessionRepositoryFilter bean named as springSessionRepositoryFilter. Finally we need to implement the CommandLineRunner in our Application or Main class JwtAuthenticationApplication, so we can insert some users with their respective roles into database at runtime.

Example project for stateless session propagation. Basically, they involve sending custom tokens or custom keys within the HTTP Request header. Only information that is considered “context” or “identity” should be passed in this way.
Here’s the relevant part of the configuration for the second project: Now, when we log in, we can route traffic to a downstream microservice through our gateway. After defining the dependencies, let’s know enable security by adding a Configuration class that extends WebSecurityConfigurerAdapter.

Let’s add the final touch and look at consuming that state down stream. Yep. The question is: How do we tie all these separate deployment units together, without adding complexity on the client-side? How we can implement step by step a stateless authentication using JWT to secure a REST API endpoints built with the help of Spring Boot and Spring Security. Lets Begin- Next, let’s add some authentication routes for our documentation tool to latch onto. HTTP.

After this approval is done, the client can send another requests without giving any user-specific identification data to the server again again.

Imagine you are building an API that manages all sorts of different things for the currently logged in user. While those may have a necessary place in your infrastructure, they are not going to help us here. So, the aim of this method is to just check whether the username and password is correct or not, and then set the isAuthenticated parameter to true and false. Make session management completely transparent to the API consumer? What this method does, is it receives the user’s credentials then check them using an implementation of the AuthenticationManager Interface, if all is correct the user get a token from the server elsewhere he will receive an unauthorized message.

Hope that this post was a great help for you. We could (if we’re ambitious) propagate the JSESSIONID itself. Exactly this can be achieved by the use of JWT.

If you are using Spring Boot, it’s as easy as adding one of them (e.g.

Example project for stateless session propagation. We need our own gateway. So, how do we propagate sessions? No configuration. Ideally, none, at least on the microservice deployment side. In this article, we defined the two types or approachs of authentication, the session-based one and the stateless authentication and we have learned step by step the way to implement a stateless authentication system in our Spring Boot application using the JWT approach from scratch. All session state we consider essential for any microservice to do its job should be available anywhere in our architecture. This class overrides the loadUserByUsername method to check if the user exists or not.

As long as the API consumer is being routed through our gateway, they have no idea that username is a required parameter for /hello.

Finally, we learned how to set up microservices that are session-aware—in fact, we already knew how, because there’s no special setup required! In this example, we’ll actually need two projects, which we’ll get to in a minute.

After this step, the client can use this token to ask for any request to the server so the server should sign and approve that the token is valid for request. In this example, we’re not being very creative. You may need to return a list of students for a teacher and a list of tests that need to be graded, as well as submit attendance reports and manage parent-teacher topics and feedback, etc. In this article, I want to focus on how to deal with automatic re-authentication of each HTTP and HTTPS requests.

It sounded theoretically possible, and solutions utilizing Spring Session or OAuth and JWTs seemed promising. If the user object already exits, that means there is a user that has a valid and not dead token. Example project for securing REST endpoints with an Authorization header for API security. What Stateless authentication means is that we don’t want to store any information about user on the server.


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