In this Spring Security tutorial, we will learn how to use Spring Security provided built-in Form-Based Authentication.
Spring Security provides support for username and password is provided through an HTML form.
Form-Based Authentication Overview
Form-based authentication uses standard HTML form (Login Form) fields to pass the username and password values to the server via a POST request.
In Form-based authentication, the server validates the credentials provided and creates a “session” tied to a unique token stored in a cookie and passed between the client and the server on each HTTP request. If the cookie is invalid or the user is logged out, the server then usually redirects to a login page.
Maven Dependencies
In order to implement Spring Security provided built-in Form-Based Authentication, we need to add below two Maven dependencies:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>Note that we are using Thymeleaf to create a simple template welcome.html that we return that template after login success.
Spring Security Configuration
By default, Spring Security form login is enabled. However, as soon as any servlet-based configuration is provided, form-based login must be explicitly provided.
The below configuration shows a minimal, explicit Java configuration:
@Bean
SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
http.csrf().disable()
.authorizeHttpRequests((authorize) -> {
authorize.anyRequest().authenticated();
}).formLogin(Customizer.withDefaults());
return http.build();
}In order to test the form-based authentication, let's create a couple of in-memory objects. In the below InMemoryUserDetailsManager Java Configuration, we have created two users and stored them in the InMemoryUserDetailsManager class object.
@Bean
public UserDetailsService userDetailsService(){
UserDetails ramesh = User.builder()
.username("ramesh")
.password(passwordEncoder().encode("password"))
.roles("USER")
.build();
UserDetails admin = User.builder()
.username("admin")
.password(passwordEncoder().encode("admin"))
.roles("ADMIN")
.build();
return new InMemoryUserDetailsManager(ramesh, admin);
}We are using BCryptPasswordEncoder class which implements the PasswordEncoder interface. The BCryptPasswordEncoder class implementation uses the widely supported bcrypt algorithm to hash the passwords.
@Bean
public static PasswordEncoder passwordEncoder(){
return new BCryptPasswordEncoder();
} .password(passwordEncoder().encode("password"))Here is the complete Spring Security configuration code:
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.Customizer;
import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.web.SecurityFilterChain;
@Configuration
public class SpringSecurityConfig {
@Bean
public static PasswordEncoder passwordEncoder(){
return new BCryptPasswordEncoder();
}
@Bean
SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
http.csrf().disable()
.authorizeHttpRequests((authorize) -> {
authorize.anyRequest().authenticated();
}).formLogin(Customizer.withDefaults());
return http.build();
}
@Bean
public UserDetailsService userDetailsService(){
UserDetails ramesh = User.builder()
.username("ramesh")
.password(passwordEncoder().encode("password"))
.roles("USER")
.build();
UserDetails admin = User.builder()
.username("admin")
.password(passwordEncoder().encode("admin"))
.roles("ADMIN")
.build();
return new InMemoryUserDetailsManager(ramesh, admin);
}
}Create WelcomeController and Thymeleaf Template
WelcomeController
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class WelComeController {
@GetMapping("/")
public String greeting() {
return "welcome";
}
}Thymeleaf Template - welcome.html
Under /resources/templates folder, create a welcome.html file and add the following content:
<html>
<body>
<h1> Welcome to Spring Security world!</h1>
</body>
</html>Use Spring Security's Default Login Page
By default, Spring Security provides a built-in Login form to secure the web application:
Test using Browser
Enter http://localhost:8080 URL in the browser and it will navigate to the login page. Next, enter a username as admin, password as admin, and click on the Sign-in button:
After successful login, you will see the below web page:
Built-In Logout Feature
Spring Security provided a built-in logout feature as well. Just enter http://localhost:8080/logout URL in the browser to logout from the application:
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