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Friday, April 26, 2019

Spring Security Interview

Q- What is spring security in java?
  • Spring Security is access-control framework.
  • Spring Security is a framework that used to focuses on security or restriction from non-authorize user in Java applications.
  • This enables a programmer to implement security restrictions to spring framework based java applications or web application through JEE components
  • Its primary area of operation is to handle authentication and authorization at the web request level as well as the method level.
  • It is a powerful framework to provide high level of security to java application 
  • It is easy to customize authentication and authorization configuration to java application.
  • It is the de-facto standard for securing Spring-based applications. 
  • Spring security protect against attacks like cross site request forgery, session fixation, clickjacking etc.
HTTP Basic Authentication Architecture diagram

Security Using JWT Token

Spring security features in java

Spring 4 Framework have the following modules as mention below.
  • Spring Security
  • Spring Security SAML
  • Spring Security OAuth
  • Spring Security Kerberos
  • Spring Cloud Security
Question: What is a SecurityContext?
Answer:-  The security context is the user account that the system uses to enforce security(currently authenticated user) when a thread attempts to access a securable object. This data includes the user security identifier (SID), group memberships, and privileges. A user establishes a security context by presenting credentials for authentication.
that means The SecurityContext is used to store the details of the currently authenticated user, also known as a principle. 

Question:  What is SecurityContextHolder in spring?
Answer:-  The SecurityContextHolder is a helper class, which provide access to the security context. By default, it uses a ThreadLocal object to store SecurityContext.

Question: SecurityContext Vs SecurityContextHolder ?
Answer:- The SecurityContext is used to store the details of the currently authenticated user, this is also known as a principle. So, if we need to get the username or any other user details, than we need to get this SecurityContext first. The SecurityContextHolder is a helper class, which provide access to the security context.
Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
	 
	if (principal instanceof UserDetails) {
	  String username = ((UserDetails)principal).getUsername();
	} else {
	  String username = principal.toString();
	}
getContext() returns an instance of the SecurityContext interface. That is stored in a thread-local storage.
getPrincipal() return UserDetails object in Spring Security, which contains all the details of currently logged in user

Question: Is SecurityContextHolder thread safe?
Answer:- Yes, it's thread safe with the default strategy ( MODE_THREADLOCAL )

Question: Difference between oauth2 and spring security in spring boot?

Question: OAuth Vs JWT Vs SAML?
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