如何清理 $_GET 变量以防止路径注入? [英] How to sanitize $_GET variables to prevent path injection?

问题描述

清理 $_GET[''] 请求的最佳方法是什么?我想只允许从一个目录下载文件.

What is the best way to sanitize $_GET[''] request? I want to allow downloading files from one directory only.

$baseDir = "/home/html/xy.com/public_html/downloads/";    
$path = realpath($baseDir . $_GET['file']);  

下一步是什么?

推荐答案

以下是我在你的台词之后要做的事情:

Here's what I would do after the lines you have there:

if (dirname($path) === $baseDir) {
    //Safe
}

http://php.net/dirname

基本上，在发送任何文件之前检查文件实际上位于您支持的路径中.请注意，您还必须在文件名(在 $path 中)之前添加您自己的 / 并将其从您的 $baseDir 定义中删除，如dirname() 不会留下尾随路径分隔符.

Basically, do a check before sending anything that the file is actually in that one path you support. Note, you will also have to add your own / before the filename (in $path) and remove it from your $baseDir definition, as dirname() won't leave a trailing path separator.

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