Spring Security

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) 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.

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.

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 the IETF Request for Comments 1945 standard.
• Digest access authentication as defined through the IETF Request for Comments 2617 and RFC 2069 standard.
• 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 allocated a security identity.
• Container adapter (custom realm) support for Apache Tomcat, Resin, JBoss and Jetty (web server).
• Windows NTLM to enable browser integration (experimental).
• Web form authentication, similar to the Servlet container specification.
• "Remember-me" support via HTTP Cookies.
• Concurrent session support, which limits the number of simultaneous logins permitted by a principal.
• Full support for customization and plugging in custom authentication implementations.

Key authorization features

• AspectJ method invocation authorization.
• HTTP authorization of web request URLs using a choice of Apache Ant paths or regular expressions.

Instance-based security features

• Used for specifying Access control lists applicable to domain objects.
• Spring Security offers a repository for storing, retrieving, and modifying ACLs in a database.
• Authorization features are provided to enforce policies before and after method invocations.

Other features

• Software localization so user interface messages can be in any language.
• Channel security, to automatically switch between HTTP and HTTPS upon meeting particular rules.
• Caching in all database-touching areas of the framework.
• Publishing of messages to facilitate event-driven programming.
• Support for performing integration testing via JUnit.
• Spring Security itself has comprehensive JUnit isolation tests.
• Several sample applications, detailed JavaDocs and a reference guide.
• Web framework independence.

External links

• Official website
• Introducing Spring Security by Ben Alex
• Spring Security 3

• https://spring.io/blog/2015/04/23/spring-security-4-0-1-released
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