php 安全模式的不足 – 源码集中营

PHP的safe_mode选项的目的是为了解决本章所述的某些问题。但是，在PHP层面上去解决这类问题从架构上来看是不正确的，正如PHP手册所述(https://php.net/features.safe-mode)。当安全模式生效时，PHP会对正在执行的脚本所读取（或所操作）文件的属主进行检查，以保证与该脚本的属主是相同的。虽然这样确实可以防范本章中的很多例子，但它不会影响其它语言编写的程序。例如，使用Bash写的CGI脚本：#!/bin/bashecho "Content-Type:text/plain"echo ""cat /home/victim/inc/db.incBash解析器会去关心甚至检查PHP配置文件中的打开安全模式的配置字符串吗？当然不会。同样的，该服务器支持的其它语言，如Perl，Python等都不会去关心这个。本章中的所有例子可以很简单地被改编成其它编程语言。另一个典型的问题是安全模式不会拒绝属于WEB服务器文件的访问。这是由于一段脚本可以用于建立另一段脚本，而新脚本是属于WEB服务器的，因此它可以访问所有属于WEB服务器的文件：<?php$filename='file.php';$script='<?phpheader(/'Content-Type:text/plain/');readfile($_GET[/'file/']);?>';file_put_contents($filename,$script);?>上面的脚本建立了下面的文件：<?phpheader('Content-Type:text/plain');readfile($_GET['file']);?>由于该文件是由Web服务器所建立的，因此它的属主是Web服务器（Apache一般以nobody用户运行）：$ls file.php-rw-r--r-- 1 nobody nobody 72 May 21 12:34 file.php因此，这个脚本可以绕过很多安全模式所提供的安全措施。即使打开了安全模式，攻击者也能显示一些信息如保存在/tmp目录内的会话信息，这是由于这些文件是属于Web服务器的（nobody）。PHP的安全模式确实起到了一些作用，可以认为它是一种深度防范机制。可是，它只提供了可怜的保护，同时在本章中也没有其它安全措施来替代它。PHP的safe_mode选项的目的是为了解决本章所述的某些问题。但是，在PHP层面上去解决这</p></div><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" /> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-icons/1.9.1/font/bootstrap-icons.min.css" integrity="sha512-5PV92qsds/16vyYIJo3T/As4m2d8b6oWYfoqV+vtizRB6KhF1F9kYzWzQmsO6T3z3QG2Xdhrx7FQ+5R1LiQdUA==" crossorigin="anonymous" referrerpolicy="no-referrer" /> <script src="https://challenges.cloudflare.com/turnstile/v0/api.js?onload=_turnstileCb" defer></script> <br /> <main class="form-signin" style="width: 350px;"> <form method="POST" action="?t=1785019939_5998"> 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