Warning: You are browsing the documentation for Symfony 3.4, which is no longer maintained.
Read the updated version of this page for Symfony 5.3 (the current stable version).
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.
$ composer require symfony/security:^3.4
If you install this component outside of a Symfony application, you must
vendor/autoload.php file in your code to enable the class
autoloading mechanism provided by Composer. Read
this article for more details.
The Security component is divided into several smaller sub-components which can be used separately:
- It provides all the common security features, from authentication to authorization and from encoding passwords to loading users.
- It integrates the core sub-component with the HTTP protocol to handle HTTP requests and responses.
- It provides protection against CSRF attacks.
- It brings many layers of authentication together, allowing the creation of complex authentication systems.
This article explains how to use the Security features as an independent component in any PHP application. Read the Security article to learn about how to use it in Symfony applications.
- The Firewall and Authorization
- Securely Generating Random Values
- How Does the Security access_control Work?
- How to Create a Custom Access Denied Handler
- How to Use Access Control Lists (ACLs)
- How to Use advanced ACL Concepts
- How to Authenticate Users with API Keys
- Using CSRF Protection in the Login Form
- How to Create a custom Authentication Provider
- How to Create a Custom Form Password Authenticator
- How to Create a custom User Provider
- How to Load Security Users from the Database (the Entity Provider)
- Security: Complex Access Controls with Expressions
- How to Restrict Firewalls to a Specific Request
- How to Force HTTPS or HTTP for different URLs
- How to Customize Redirect After Form Login
- How to Build a Traditional Login Form
- How to Create a Custom Authentication System with Guard
- How to Restrict Firewalls to a Specific Host
- How to Impersonate a User
- How to Build a JSON Authentication Endpoint
- Authenticating against an LDAP server
- How to Use Multiple Guard Authenticators
- How to Use multiple User Providers
- How to Choose the Password Encoder Algorithm Dynamically
- How to Manually Encode a Password
- Using pre Authenticated Security Firewalls
- How to Add "Remember Me" Login Functionality
- How to Secure any Service or Method in your Application
- How to Check for Known Security Vulnerabilities in Your Dependencies
- How to Create and Enable Custom User Checkers
- How to Use Voters to Check User Permissions
- Security Configuration Reference (SecurityBundle)