Security protection implementation methods in Workerman documents

Workerman is a high-performance PHP asynchronous network programming framework for real-time communication and high-concurrency processing scenarios. Security protection is an important part of any application design. Workerman's security protection implementation methods mainly include the following. The following will introduce in detail and provide code examples.

1. Prevent SQL Injection

SQL injection means that an attacker injects malicious SQL code into an application to perform illegal operations on the database or obtain sensitive information. In Workerman, we can use PDO prepared statements to prevent SQL injection attacks. That is, use ? placeholders in the program to replace parameters in dynamically spliced ​​SQL statements.

The following is a sample code using PDO prepared statements:

<?php
    //连接数据库
    $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
    //准备SQL语句，使用?作为占位符
    $stmt = $dbh->prepare('SELECT * FROM user WHERE username = ? AND password = ?');
    //执行SQL语句，传入参数数组
    $stmt->execute(array($username, $password));
    //遍历结果集
    while ($row = $stmt->fetch()) {
        //处理数据
    }
?>

2. Preventing XSS attacks

Insert malicious script code into the system to steal or tamper with users' sensitive information. In Workerman, we can use the htmlentities() function to escape all special characters entered by the user into HTML entities, thus preventing malicious script code from being executed.

The following is a sample code using the htmlentities() function:

<?php
    function safe_echo($text) {
        return htmlentities($text, ENT_QUOTES, 'UTF-8');
    }
    //输出用户输入的内容
    echo "Your comment: " . safe_echo($_POST['comment']);
?>

3. Preventing CSRF attacks

A CSRF attack occurs when an attacker exploits user browsing The authentication mechanism of the server is used to submit malicious requests to the application, thereby impersonating the user's identity to perform illegal operations. In Workerman, we can use token verification to prevent CSRF attacks. That is, a randomly generated token is added to each form, and you need to verify whether the token is correct when submitting the form. If the token is incorrect, the request is rejected.

The following is a sample code using token verification:

<?php
    session_start();
    //生成随机token
    $token = md5(rand());
    //将token保存到session中
    $_SESSION['token'] = $token;
    //在表单中添加token
    echo '<form method="post" action="submit.php">';
    echo '<input type="hidden" name="token" value="' . $safe_token . '" />';
    //其他表单控件
    echo '</form>';
    //处理表单提交
    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
        //验证token是否正确
        if ($_POST['token'] !== $_SESSION['token']) {
            //token不正确，拒绝请求
            die('Invalid token');
        }
        //其他表单数据处理
    }
?>

The above is an introduction to the security protection implementation method and code examples in the Workerman document. I hope it can help developers better protect application security. .

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