如何防止Apache+PHP环境下虚拟主机被旁注

IIS环境下比较容易实现，可以通过独立“匿名访问账户” + NTFS权限来防止。

查了一下，Apache下类似IIS的独立虚拟主机账户的方案貌似不太好实现，但有一种更简单的方法：

就是在VirtualHost节中通过添加

php_admin_value open_basedir /data/wwwroot/www.xxxxx.com

来限制当前虚拟主机PHP的操作权限仅在/data/wwwroot/www.xxxx.com目录下。

我用Phpspy测试了一下，果然很有效，未加该限制时可以列出文件)。
注意：

因为Web服务器在处理文件上传时会用到系统的临时目录(对于Linux来说就是/tmp)，所以还必须要

有这个目录的操作权限才可以。

php_admin_value open_basedir支持同时设置多个目录，目录之前要用:分隔。完整如下：

php_admin_value open_basedir /data/wwwroot/www.redicecn.com/:/tmp/

来自于PHP官方的更多说明：http://www.php.net/manual/en/ini.core.php#ini.open-basedir

www.chnhack.com

open_basedir stringLimit the files that can be opened by PHP to the specified

directory-tree, including the file itself. This directive is NOT affected by whether

Safe Mode is turned On or Off.

When a script tries to open a file with, for example, fopen() or gzopen(), the

location of the file is checked. When the file is outside the specified

directory-tree, PHP will refuse to open it. All symbolic links are resolved, so it’s

not possible to avoid this restriction with a symlink. If the file doesn’t exist then

the symlink couldn’t be resolved and the filename is compared to (a resolved)

open_basedir .

The special value . indicates that the working directory of the script will be used as

the base-directory. This is, however, a little dangerous as the working directory of

the script can easily be changed with chdir().

In httpd.conf, open_basedir can be turned off (e.g. for some virtual hosts) the same

way as any other configuration directive with “php_admin_value open_basedir none“.

Under Windows, separate the directories with a semicolon. On all other systems,

separate the directories with a colon. As an Apache module, open_basedir paths from

parent directories are now automatically inherited.

The restriction specified with open_basedir is a directory name since PHP 5.2.16 and

5.3.4. Previous versions used it as a prefix. This means that “open_basedir =

/dir/incl” also allowed access to “/dir/include” and “/dir/incls” if they exist.

When you want to restrict access to only the specified directory, end with a slash.

For example: open_basedir = /dir/incl/

The default is to allow all files to be opened.

Note:

As of PHP 5.3.0 open_basedir can be tightened at run-time. This means that if

open_basedir is set to /www/ in php.ini a script can tighten the configuration to

/www/tmp/ at run-time with ini_set(). When listing several directories, you can use

the PATH_SEPARATOR

另外看到了另外一种设置临时目录的方法：

http://brandonwamboldt.ca/multiple-directories-w-php-open_basedir-540/

php_admin_value open_basedir /var/www/vhosts/saebermedia.com

php_admin_value upload_tmp_dir /var/www/vhosts/saebermedia.com/.tmp