PHP SSO single sign-on implementation principle analysis

PHP SSO single sign-on implementation principle analysis

With the development of the Internet, people often encounter the need to log in again when using various websites and applications. problem, which not only wastes the user's time, but also brings inconvenience to the user. In order to solve this problem, SSO (Single Sign-On) technology came into being.

1. The concept of SSO single sign-on

SSO (Single Sign-On) is an authentication mechanism that allows users to log in only once in multiple associated applications. to access these applications. To put it simply, users only need to provide login credentials once and can seamlessly switch between multiple applications.

2. The implementation principle of SSO single sign-on

The roles required to implement SSO single sign-on include users, service providers (Service Provider, SP) and identity providers (Identity Provider, IdP). When a user logs in to an application for the first time, the system will perform identity authentication, then store the authentication result in the user's browser cookie, generate a unique identifier, and store this identifier in the application's database. . When the user accesses other applications, this identifier will also be sent to the service provider's server, and the service provider can authenticate based on this identifier to avoid repeated logins by the user.

Let’s use a specific example to understand the implementation principle of SSO single sign-on.

1. Create an Identity Provider (IdP)

An identity provider is the core system responsible for user authentication. First, we create a PHP file to implement the identity provider functionality.

2. Create a service provider (SP)

A service provider is an application system that relies on an identity provider to complete identity authentication. Similarly, we create a PHP file to implement the service provider functionality.

 Logout

3. Create a page for user login

Create a login.php file in the service provider's directory for user login.

 
 
 
 Login 

4. Create user logout function

Create a logout.php file in the service provider's directory for user logout.

3. Summary

SSO single sign-on, through the cooperation of identity providers and service providers, enables users to log in once and use it in multiple applications. During the implementation process, a suitable authentication mechanism needs to be adopted to ensure the security of login, and the identifier of the authentication result is saved in the system to facilitate authentication between various applications. The above is an analysis of the implementation principles of PHP SSO single sign-on. I hope it will be helpful to everyone.

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