PHP Server Protection Guide: Effective Measures to Block File Downloads

In today's network environment, protecting the security of website servers is crucial. Among them, preventing malicious users from downloading server files is a key aspect of server security. This article will introduce some effective measures to prohibit file downloads and provide specific PHP code examples.

1. The necessity of prohibiting file downloads
Malicious users may try to obtain sensitive information or carry out attacks by downloading sensitive files on the server. Therefore, for some important files, such as database configuration files, source code files, etc., we need to take some measures to prevent users from directly downloading these files.

2. Methods to prohibit file downloads
1. Add a ".htaccess" file in the root directory of the website and add the following code:

<FilesMatch ".(sql|xml|json|html|log|htaccess)$">
    Order allow,deny
    Deny from all
</FilesMatch>

This code uses the Apache server The file matching function limits the user's access rights to files of specified types.

2. Use PHP code to implement file download permission control. The specific code is as follows:

<?php
$filename = "config.php"; //要禁止下载的文件名

if (file_exists($filename)) {
    header('HTTP/1.0 403 Forbidden');
    die('Access Forbidden');
} else {
    // 允许文件下载
}
?>

This PHP code will check whether the specified file exists. If it exists, it will return a 403 error, otherwise it will be allowed. Download Document.

3. Restrict file downloads by configuring the "nginx.conf" file:

location ~* .(sql|xml|json|html|log|htaccess)$ {
    return 403;
}

This Nginx configuration will restrict user access to matching suffix files.

3. Other protection suggestions
1. Back up important files regularly to prevent accidental deletion or tampering of files.
2. Keep the server and related software updated to the latest version to fix possible vulnerabilities.
3. Restrict users' access to server files to prevent files from being downloaded by unauthorized users.

4. Summary
Through the above methods and suggestions, we can effectively prohibit malicious users from downloading server files, thereby protecting the security of the server. In daily operation and maintenance, we should pay close attention to server security issues and take timely measures to protect server data. I hope this article can be helpful to everyone.

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