Spring Boot Tutorial
Spring Boot - Software Setup and Configuration (STS/Eclipse/IntelliJ)
Prerequisite (Spring Core Concepts)
Spring Boot Core
Spring Boot with REST API
Spring Boot with Database and Data JPA
Spring Boot with Kafka
Spring Boot with AOP
To implement simple authentication in a Spring Boot application, you can use Spring Security. Here's a basic walkthrough of how to set up a simple username and password-based authentication:
Add the required Spring Security dependencies to your pom.xml:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
Spring Security provides default security settings (e.g., a default user with a generated password). To customize these settings, you can create a configuration class:
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.csrf().disable() // You might want to disable CSRF for simplicity, but it's a security feature you should consider enabling in production
.authorizeRequests()
.antMatchers("/public/**").permitAll() // Public URLs
.anyRequest().authenticated() // All other URLs are secured
.and()
.httpBasic(); // Use basic authentication
}
@Bean
public BCryptPasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder();
}
}
The UserDetailsService interface provides a way to retrieve user-related data. You can implement this to provide users and roles:
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.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
@Service
public class MyUserDetailsService implements UserDetailsService {
@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
// In this simple example, only a single user is supported.
// In a real-world scenario, you would fetch the user from a database or another external source.
if ("user".equals(username)) {
return User
.withUsername("user")
.password(passwordEncoder().encode("password")) // Always encode passwords!
.roles("USER")
.build();
} else {
throw new UsernameNotFoundException("User not found");
}
}
@Bean
public BCryptPasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder();
}
}
When you run your Spring Boot application, Spring Security will secure all endpoints by default. You can use the default username (user) and the generated password (printed in the console on startup) to access your application.
For any endpoint under /public/, no authentication is required (as per our configuration). For all other endpoints, you'll be prompted for a username and password.
This is a very basic authentication setup. In real-world applications, you would typically integrate with a database to fetch user details, handle user registration, use form-based login, and possibly add OAuth2 or JWT-based authentication. Always ensure you follow security best practices when implementing authentication and authorization in your applications.
Configuring basic username and password authentication in Spring Boot:
@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.inMemoryAuthentication()
.withUser("user").password("{noop}password").roles("USER");
}
// Other security configurations
}
Creating a login page for simple authentication in Spring Boot:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login Page</title>
</head>
<body>
<form action="/login" method="post">
<label for="username">Username:</label>
<input type="text" id="username" name="username" required>
<br>
<label for="password">Password:</label>
<input type="password" id="password" name="password" required>
<br>
<button type="submit">Login</button>
</form>
</body>
</html>
Setting up an authentication provider in Spring Boot:
Description: Configure an authentication provider for advanced authentication options.
Java Code (CustomAuthenticationProvider.java):
@Component
public class CustomAuthenticationProvider implements AuthenticationProvider {
// Implementation of authenticate method
}
Java Code (SecurityConfig.java):
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.authenticationProvider(new CustomAuthenticationProvider());
}
Securing endpoints with basic authentication in Spring Boot:
@Override
protected void configure(HttpSecurity http) throws Exception {
http.authorizeRequests()
.antMatchers("/secured-endpoint").authenticated()
.anyRequest().permitAll()
.and()
.httpBasic();
}
Customizing login forms and authentication filters in Spring Boot:
@Override
protected void configure(HttpSecurity http) throws Exception {
http.formLogin()
.loginPage("/custom-login")
.usernameParameter("custom-username")
.passwordParameter("custom-password")
.and()
.addFilterBefore(new CustomAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class);
}
Handling user roles and authorities in Spring Boot authentication:
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
// Return a list of authorities based on user roles
}
Storing user credentials securely with Spring Boot:
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
}
Configuring remember-me authentication in Spring Boot:
@Override
protected void configure(HttpSecurity http) throws Exception {
http.rememberMe().key("uniqueAndSecret").tokenValiditySeconds(86400);
}
Implementing session management for simple authentication in Spring Boot:
@Override
protected void configure(HttpSecurity http) throws Exception {
http.sessionManagement().maximumSessions(1).sessionRegistry(sessionRegistry());
}
Integrating Spring Security for simple authentication:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
Implementing stateless token-based authentication in Spring Boot:
public class JwtTokenProvider {
// Token creation and validation methods
}
@Override
protected void configure(HttpSecurity http) throws Exception {
http.apply(new JwtConfigurer(jwtTokenProvider));
}
Handling authentication failures and errors in Spring Boot:
@Override
protected void configure(HttpSecurity http) throws Exception {
http.exceptionHandling().authenticationEntryPoint(customAuthenticationEntryPoint);
}
Customizing success and failure handlers in Spring Boot authentication:
Description: Customize success and failure handlers for tailored responses in Spring Boot authentication.
Java Code (CustomAuthenticationSuccessHandler.java and CustomAuthenticationFailureHandler.java):
public class CustomAuthenticationSuccessHandler implements AuthenticationSuccessHandler {
// Implementation of onAuthenticationSuccess method
}
public class CustomAuthenticationFailureHandler implements AuthenticationFailureHandler {
// Implementation of onAuthenticationFailure method
}
Java Code (SecurityConfig.java):
@Override
protected void configure(HttpSecurity http) throws Exception {
http.formLogin()
.successHandler(customAuthenticationSuccessHandler)
.failureHandler(customAuthenticationFailureHandler);
}
Enforcing HTTPS for secure authentication in Spring Boot:
@Override
protected void configure(HttpSecurity http) throws Exception {
http.requiresChannel().anyRequest().requiresSecure();
}
Configuring authentication providers with LDAP in Spring Boot:
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.ldapAuthentication()
.userDnPatterns("uid={0},ou=people")
.groupSearchBase("ou=groups");
}
Implementing two-factor authentication in Spring Boot:
Description: Implement two-factor authentication for an extra layer of security in Spring Boot.
Java Code (TwoFactorAuthenticationProvider.java):
public class TwoFactorAuthenticationProvider implements AuthenticationProvider {
// Implementation of authenticate method for two-factor authentication
}
Java Code (SecurityConfig.java):
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.authenticationProvider(twoFactorAuthenticationProvider);
}