Authentication flow in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the authentication flow in a Spring Boot application?

The authentication flow verifies a user's identity before granting access to protected resources. It ensures only authorized users can use the app features.

beginner

Which Spring Security component handles user login credentials validation?

The AuthenticationManager is responsible for validating user credentials during login in Spring Security.

intermediate

What role does the UserDetailsService play in Spring Boot authentication?

UserDetailsService loads user-specific data like username, password, and roles from a database or other source during authentication.

intermediate

Explain the difference between authentication and authorization in the context of Spring Boot.

Authentication confirms who the user is (login). Authorization decides what the user can do (permissions). Both are handled separately in Spring Security.

advanced

What is a common way to secure REST APIs in Spring Boot during authentication?

Using JWT (JSON Web Tokens) to securely transmit user identity after login is a common method to protect REST APIs in Spring Boot.

In Spring Boot, which interface is typically implemented to load user data for authentication?

A PasswordEncoder

B AuthenticationManager

C SecurityConfigurer

D UserDetailsService

UserDetailsService loads user data like username and password for authentication.

What does the AuthenticationManager do in Spring Security?

A Validates user credentials

B Manages user sessions

C Encrypts passwords

D Defines URL access rules

AuthenticationManager checks if the provided credentials are valid.

Which token type is commonly used for stateless authentication in Spring Boot REST APIs?

A Session ID

B OAuth Token

C JWT

D CSRF Token

JWT tokens carry user identity securely without server-side session storage.

What is the first step in a typical authentication flow?

A User submits login credentials

B User requests a protected resource

C Server sends a JWT token

D User logs out

Authentication starts when the user submits their login credentials.

Which Spring Security class is responsible for encoding passwords?

A AuthenticationManager

B PasswordEncoder

C UserDetailsService

D SecurityFilterChain

PasswordEncoder hashes passwords to store and compare securely.

Describe the main steps in a Spring Boot authentication flow from login to access granted.

Think about what happens when you log in to a website.

Explain how JWT helps in securing REST APIs in Spring Boot authentication.

Imagine a secure badge you carry to prove who you are.