Spring Security is a comprehensive security framework for Java applications that provides authentication and authorization for both web and non-web environments. It functions as an implementation of authentication and authorization logic integrated with the Java runtime environment to protect sensitive resources from unauthorized access.
The framework includes toolkits for implementing OpenID Connect and OAuth 2.0 authorization servers and clients, as well as tools for integrating SAML 2.0 identity providers to enable cross-domain single sign-on. It utilizes a role-based access control system to restrict application resources based on assigned user roles and specific permissions.
The project covers enterprise application security through user authentication management and web request authorization. It employs a variety of mechanisms to control resource access, including filter-chain based interception and aspect-oriented access control.