.. index:: single: Security
The Security component provides a complete security system for your web application. It ships with facilities for authenticating using HTTP basic authentication, interactive form login or X.509 certificate login, but also allows you to implement your own authentication strategies. Furthermore, the component provides ways to authorize authenticated users based on their roles.
The Security component is divided into several smaller sub-components which can be used separately:
symfony/security-core- It provides all the common security features, from authentication to authorization and from encoding passwords to loading users.
symfony/security-http- It integrates the core sub-component with the HTTP protocol to handle HTTP requests and responses.
symfony/security-csrf- It provides protection against CSRF attacks.
symfony/security-guard- It brings many layers of authentication together, allowing the creation of complex authentication systems.
You can install each of them separately in your project:
$ composer require symfony/security-core
$ composer require symfony/security-http
$ composer require symfony/security-csrf
$ composer require symfony/security-guard
.. seealso::
This article explains how to use the Security features as an independent
component in any PHP application. Read the :doc:`/security` article to learn
about how to use it in Symfony applications.
.. toctree::
:maxdepth: 1
:glob:
/components/security/*
/security
/security/*
/reference/configuration/security
/reference/constraints/UserPassword