Alternatively, you can also ask for the Authentication object instead of a Principal object, as shown below:. If you want to learn more ways, you can also see my post about three ways to get the current username in Spring Security , where I have discussed a couple of more ways to retrieve the current username in Spring MVC controller. These are some of the fundamental classes, hence you must be familiar with them.
The storage part, i. SecurityContext , that stored in ThreadLocal is optional, but it's also good to know the detail. Just remember, if you ever need user details, e. Thanks for reading this tutorial. If you like this tutorial, then please share with your friends and colleagues.
If you have any questions or feedback, then please drop a note below! See the original article here. Thanks for visiting DZone today,. Edit Profile. Sign Out View Profile. Over 2 million developers have joined DZone. Need help finding the current logged-in username in Spring Security? Like Then none of the following applies and you should go straight to the OAuth2 chapter.
Keep that in mind. Imagine you have a database table where you store your users. Note that the method takes only one parameter: username not the password.
So you can either implement these interfaces yourself, like we did above, or use existing ones that Spring Security provides. InMemoryUserDetailsManager , which keeps all userdetails in-memory and is great for testing. User , which is a sensible, default UserDetails implementation that you could use. Alternatively, you could simply make your entities implement the UserDetails interface.
This is what happens when you specify a UserDetailsService and try to login:. Take the extracted password from the HTTP Basic Auth header, hash it automatically and compare it with the hashed password from your UserDetails object.
If both match, the user is successfully authenticated. But hold on, how does Spring Security hash the password from the client step 3? With what algorithm? Spring Security cannot magically guess your preferred password hashing algorithm.
Then you would use the following encoder:. How does this delegating encoder work? That prefix, is your hashing method! Your database table would then look like this:. Depending on the prefix value, use the correct PasswordEncoder i. Specify a UserDetailsService. Either a custom implementation or use and configure one that Spring Security offers.
Now, imagine that you are using Atlassian Crowd for centralized identity management. That means all your users and passwords for all your applications are stored in Atlassian Crowd and not in your database table anymore.
You do not have the user passwords anymore in your application, as you cannot ask Crowd to just give you those passwords. If that is the case, you cannot use a UserDetailsService anymore, instead you need to implement and provide an AuthenticationProvider Bean. An AuthenticationProvider consists primarily of one method and a naive implementation could look like this:. Compared to the UserDetails load method, where you only had access to the username, you now have access to the complete authentication attempt, usually containing a username and password.
If authentication succeeded, you need to return a fully initialized UsernamePasswordAuthenticationToken. It is an implementation of the Authentication interface and needs to have the field authenticated be set to true which the constructor used above will automatically set. This is what happens when you specify an AuthenticationProvider and try to login:. Call your AuthenticationProvider e.
AtlassianCrowdAuthenticationProvider with that username and password for you to do the authentication e. REST call yourself. Maybe an area for callcenter agents, where they can login and see what a customer recently bought or where their parcel is.
Its URL could be www. A separate admin area, where administrators can login and manage callcenter agents or other technical aspects like themes, performance, etc. He is only allowed to shop in the website. Simply put, you want to allow different access for different users, depending on their authorities or roles. The distinction between roles and authorities is purely conceptual and something that often bewilders people new to Spring Security. For now, we will go with SimpleGrantedAuthority, only.
Assuming you are storing the users in your own application think: UserDetailsService , you are going to have a Users table.
Now, you would simply add a column called "authorities" to it. For this article I chose a simple string column here, though it could contain multiple, comma-separated values. Note: Referring back to What are Authorities? What are Roles? Strings, to the database. You simply map whatever is inside your database column to a list of SimpleGrantedAuthorities. You could also use your own class implementing UserDetails here and might not even have to map then. Atlassian Crowd had the concepts of "roles", but deprecated it in favour of "groups".
So, depending on the actual product you are using, you need to map this to a Spring Security authority, in your AuthenticationProvider.
Note: This is not actual Atlassian Crowd code, but serves its purpose. User object. That user can be a member of one or more groups, which are assumed to be just strings here. So far, we talked a lot about storing and retrieving authorities for authenticated users in Spring Security. Instead of calling "hasAuthority", you now call "hasRole".
Instead of calling "hasAnyAuthority", you now call "hasAnyRole". Last, but not least, the most powerful way to configure authorizations, is with the access method.
It lets you specify pretty much any valid SpEL expressions. There is a variety of common attacks that Spring Security helps you to protect against. It starts with timing attacks i. Spring Security will always hash the supplied password on login, even if the user does not exist and ends up with protections against cache control attacks, content sniffing, click jacking, cross-site scripting and more.
It is impossible to go into the details of each of these attacks in the scope of this guide. Hence, we will only look at the one protection that throws most Spring Security newbies off the most: Cross-Site-Request-Forgery.
Imagine a bank transfer form or any form like a login form for that matter, that gets rendered by your Controllers with the help of a templating technology like Thymeleaf or Freemarker.
It generates such a token, by default, per HTTP session and stores it there. And you need to make sure to inject it into any of your HTML forms. Even better, if you are using "th:action" for your form, Thymeleaf will automatically inject that hidden field for you, without having to do it manually. I cannot cover all templating libraries in this section, but as a last resort, you can always inject the CSRFToken into any of your Controller methods and simply add it to the model to render it in a view or access it directly as HttpServletRequest request attribute.
Things are a bit different for a Javascript app, like a React or Angular single page app. This is how you would do it:. Check it out! For most of this article, you only specified security configurations on the web tier of your application. That is a perfectly fine and standard approach to security.
That means in addition to protecting URLs, you might want to protect your business logic itself. Think: your Controllers, Components, Services or even Repositories. In short, your Spring beans. That approach is called method security and works through annotations that you can basically put on any public method of your Spring beans. You also need to explicitly enable method security by putting the EnableGlobalMethodSecurity annotation on your ApplicationContextConfiguration.
Support means, that Spring will ignore this annotation unless you set the flag to true. How can I access the current logged in user object? So how can I use the returned Username and get the UserDetails object?
Returns the current user object. This can be User , UserDetails or your custom user object. You will need to cast the return object to UserDetails or your own user object if it is a custom one.
OR you can inject Authentication or Principal directly in to your controllers. You just went one step foo far. You should know how you authenticated the user, and what can the the concrete class implementing Authentication.
Assuming it is a subclass of AbstractAuthenticationToken all Spring provided implementation are , and getDetails returns a UserDetails , you can just use:. You can simply inject the Authentication Interface to your Controller and get the username of the logged in user, like below:. I solved this problem by using SecurityContextHolder and Authentication. Since version 5. If you want to get all the attributes of your current user , first go to the class that implements UserDetails , more likely its called UserPrincipal and write a get method for each attribute like : getAge , seconde go to you HTML file and write this.
And by the way you dont need to add any ModelAttribute in your controller Hope it fix the problem , and you can ask me. This may be a good article to read. The article shows how to get the user information in a Spring application, starting with the common static access mechanism, followed by several better ways to inject the principal.
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