Use PHP Session to achieve cross-domain single sign-on

Use PHP Session to achieve cross-domain single sign-on

With the development of Internet technology, Single Sign-On (Single Sign-On, referred to as SSO) has become a popular choice for many websites and application requirements. SSO enables users to authenticate with one login without having to log in again across multiple related domains. In this article, we will introduce how to use PHP Session to implement single sign-on across domains.

Implementing single sign-on requires the following three main components:

1. Authentication Center (Authentication Center): Responsible for user login verification and authorization.
2. Main Application: The application with main functions.
3. Sub Application: Other applications related to the main application.

The following are specific code examples:

Authentication center code example (auth_center.php):

<?php

// 启动会话
session_start();

// 用户登录验证
function authenticateUser($username, $password) {
    // 进行用户验证逻辑
    // ...

    // 验证成功，保存用户信息到 Session 中
    $_SESSION['username'] = $username;
    // 其他需要保存的用户信息
    // ...
}

// 判断用户是否已登录
function isUserLoggedIn() {
    return isset($_SESSION['username']);
}

// 用户注销
function logoutUser() {
    session_unset();   // 清除 Session 中的所有数据
    session_destroy(); // 销毁 Session
}

Main application code example (main_app.php):

<?php

// 启动会话
session_start();

// 认证中心的 URL
$authCenterUrl = 'http://auth-center.com/auth_center.php';

// 判断用户是否已登录
function isUserLoggedIn() {
    return isset($_SESSION['username']);
}

// 单点登录逻辑
if (!isUserLoggedIn()) {
    // 跳转到认证中心进行登录
    header('Location: ' . $authCenterUrl);
}

// 获取用户信息
$username = $_SESSION['username'];
// 其他用户信息的获取
// ...

// 主应用主体逻辑
// ...

Sub-application code example (sub_app.php):

<?php

// 启动会话
session_start();

// 认证中心的 URL
$authCenterUrl = 'http://auth-center.com/auth_center.php';

// 单点登录逻辑
if (!isset($_SESSION['username'])) {
    // 跳转到认证中心进行登录
    header('Location: ' . $authCenterUrl);
}

// 获取用户信息
$username = $_SESSION['username'];
// 其他用户信息的获取
// ...

// 子应用主体逻辑
// ...

In the above code example, the authentication center is responsible for user login verification and authorization, and the main application and sub-application are used to demonstrate the effect of single sign-on .

When using it, you need to place the above three code examples under their respective domain names, and configure the domain name according to the actual situation. The URL of the certification authority needs to be configured in the main application and sub-applications.

In the implementation of single sign-on, the main application and sub-applications determine whether the user is logged in by checking whether user information exists in the Session. If you are not logged in, jump to the certification center to log in. After the authentication center successfully logs in, the user information will be saved in the Session. The main application and the sub-application can share the user login status through the Session, thereby realizing single sign-on.

Taking into account security factors, in actual applications, it is also necessary to carry out security measures such as identity verification and Token verification on the certification center to ensure user login security and data credibility.

By using PHP Session to implement single sign-on across domains, it can improve convenience and user experience, reduce users’ repeated login operations, and improve the overall user management efficiency of websites and applications.

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