Create Custom UserDetailsService

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Spring Security is a powerful and highly customizable authentication and access-control framework. It is the de-facto standard for securing Spring-based applications.

Spring Security is a framework that focuses on providing both authentication and authorization to Java applications. Like all Spring projects, the real power of Spring Security is found in how easily it can be extended to meet custom requirements

Features
Comprehensive and extensible support for both Authentication and Authorization

Protection against attacks like session fixation, clickjacking, cross site request forgery, etc

Servlet API integration

Optional integration with Spring Web MVC

Much more…

Resources
Getting Help

Getting Spring Security

Getting Started

Getting Started (Servlet)

Getting Started (WebFlux)

Contributing
Spring Security
From Wikipedia, the free encyclopedia
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Spring Security
Developer(s) 4
Stable release
5.2.1 / November 4, 2019; 2 years ago [1]
Written in Java
Operating system Cross-platform
Type web application framework security
License Apache License 2.0
Spring Security is a Java/Java EE framework that provides authentication, authorization and other security features for enterprise applications. The project was started in late 2003 as 'Acegi Security' (pronounced Ah-see-gee /ɑːsiːdʒiː/, whose letters are the first, third, fifth, seventh, and ninth characters from the English alphabet, in order to prevent name conflicts[2]) by Ben Alex, with it being publicly released under the Apache License in March 2004. Subsequently, Acegi was incorporated into the Spring portfolio as Spring Security, an official Spring sub-project. The first public release under the new name was Spring Security 2.0.0 in April 2008, with commercial support and training available from SpringSource.

Contents
1 Authentication flow
2 Key authentication features
3 Key authorization features
4 Instance-based security features
5 Other features
6 Releases
7 References
8 External links
Authentication flow
Diagram 1 shows the basic flow of an authentication request using the Spring Security system. It shows the different filters and how they interact from the initial browser request, to either a successful authentication or an HTTP 403 error.

ACEGI Authentication.JPG

Browser submits "authentication credentials"
"Authentication mechanism" collects the details
An "authentication request" object is built
Authentication request sent to an AuthenticationManager
AuthenticationManager (this is responsible for passing requests through a chain of AuthenticationProviders')
"Authentication provider" will ask a UserDetailsService to provide a UserDetails object
The resultant UserDetails object (which also contains the GrantedAuthority[]s) will be used to build the fully populated Authentication object.
If "Authentication mechanism" receives back the fully populated Authentication object, it will deem the request valid, put the Authentication into the SecurityContextHolder; and cause the original request to be retried.
If, on the other hand, the AuthenticationProvider rejected the request, the authentication mechanism will ask the user agent to retry.
AbstractSecurityInterceptor authorizes the regenerated request and throws Java exceptions. (Asks AccessDecisionManager for decision.)
ExceptionTranslationFilter translates the exceptions thrown by AbstractSecurityInterceptor into HTTP related error codes
Error code 403 – if the principal has been authenticated and therefore simply lacks sufficient access
Launch an AuthenticationEntryPoint – if the principal has not been authenticated which is an authentication mechanism
Key authentication features
LDAP (using both bind-based and password comparison strategies) for centralization of authentication information.
Single sign-on capabilities using the popular Central Authentication Service.
Java Authentication and Authorization Service (JAAS) LoginModule, a standards-based method for authentication used within Java. Note this feature is only a delegation to a JAAS Loginmodule.
Basic access authentication as defined through RFC 1945.
Digest access authentication as defined through RFC 2617 and RFC 2069.
X.509 client certificate presentation over the Secure Sockets Layer standard.
CA, Inc SiteMinder for authentication (a popular commercial access management product).
Su (Unix)-like support for switching principal identity over a HTTP or HTTPS connection.
Run-as replacement, which enables an operation to assume a different security identity.
Anonymous authentication, which means that even unauthenticated principals are a

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