发送带有表单提交的PHP文件系统函数的变量

问题描述

我正在尝试找到一种安全的方法来进行以下操作:

I'm trying to find a secure way to do the following:

1. 用户以html形式输入值.
2. 表单已提交.
3. PHP使用提交的值作为"scandir"函数的参数.

我的理论是php脚本中包含逻辑，该逻辑禁止绝对路径，并要求目录名称包含某个值.

My theory is include logic in the php script that forbids absolute paths and requires the directory name to include a certain value.

我担心的是，黑客可能会使用我的表单来提交自己的价值并访问敏感文件.

My concern is that a hacker could use my form to submit his own value and access sensitive files.

这是针对JQuery插件的.我不希望用户必须修改PHP文件.

This is for a JQuery plugin. I don't want users to have to modify the PHP file.

如何破解以下代码?

<?php

$foo = $_POST["some_directory"];

//validate $foo

//make sure path to directory is relative
$foo_url_test  = parse_url($foo);
if (isset($foo_url_test['scheme']) || isset($foo_url_test['host'])) {
$foo = NULL;
}

//make sure the directory name contains 'bar123'
$foo_name_test = preg_split('_[\\\\/]_', $foo);
$foo_name_test = end($foo_name_test);
$foo_name_test = strpos($foo_name_test,'bar123');
if ($foo_name_test === false) {
$foo = NULL;
}

//make sure the path does not contain '..'
$foo_dot_dot_test = strpos($foo,'..');
if ($foo_dot_dot_test == TRUE || $foo_dot_dot_test === 0) {
$foo = NULL;
}

//get files
$files_array = scandir($foo);

?>

推荐答案

您可能想看看 realpath().

$foo = realpath($foo);
if (substr($foo, 0, 8) != '/my/path') {
    return false;
}

...或类似的东西.

...or something like that.

这篇关于发送带有表单提交的PHP文件系统函数的变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！