Security Strategy: advanced defense for PHP script Trojans

If apache is built on the windos platform, we still need to pay attention to it. apache runs the system permission by default, which is terrible and unpleasant. let's drop apache permissions.

1. prevent jumping out of the web Directory

First, modify httpd. conf. if you only want your php script to be held in the web directory, you can also modify the httpd. conf file to limit the php control path. For example, if your web directory is/usr/local/apache/htdocs, add the following lines in httpd. conf:

Php_admin_value open_basedir/usr/local/apache/htdocs

In this way, if the script is to read files other than/usr/local/apache/htdocs, it will not be agreed. if the error is displayed, the following error will be prompted:

Warning: open_basedir restriction in effect. File is in wrong directory in/usr/local/apache/htdocs/open. php on line 4 and so on.

2. prevent php Trojans from performing webshell

Enable safe_mode,

Set in, php. ini

Disable_functions = passthru, exec, shell_exec, system

Select either of them.

3. prevent php Trojans from reading and writing file directories

In php. ini

Disable_functions = passthru, exec, shell_exec, system

Add the php file processing function.

Important

Fopen, mkdir, rmdir, chmod, unlink, dir

Fopen, fread, fclose, fwrite, file_exists

Closedir, is_dir, readdir. opendir

Fileperms. copy, unlink, delfile

Become

Disable_functions = passthru, exec, shell_exec, system, fopen, mkdir, rmdir, chmod, unlink, dir

, Fopen, fread, fclose, fwrite, file_exists

, Closedir, is_dir, readdir. opendir

, Fileperms. copy, unlink, delfile

Okay, it's done. we have no choice but to use the php Trojan. Unfortunately, those things that use the text database won't work anymore.

If apache is built on the windos platform, we still need to pay attention to it. apache runs the system permission by default, which is terrible and unpleasant. let's drop apache permissions.

 

Net user apache *** microsoft/add

Net localgroup users apache/del

OK. We have created a user apche that does not belong to any group.

We open the computer controller, select the service, and click the apache service attribute. we select log on and select this account. we enter the account and password created above and restart the apache service, OK. apache runs under low permissions.

In fact, we can also set the permissions for each folder so that apache users can only perform what we want them to do, and create a single read/write user for each directory. This is also a popular configuration method for many VM providers, but this method is used to prevent the usage from being too small.