Defend against php Trojan attacks

Author: Alpha from: http://www.54hack.info/

1. Prevent jumping out of the web directory

Modify httpd. conf. If you only allow Your php script program to operate in the web directory, you can also modify the httpd. conf file to limit the php operation path. Ratio
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 allowed. If the error is displayed, It will be opened.
The following error is 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 executing 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.
Mainly include
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
OK, I'm done. We have no match with the php Trojan. ^ _ ^
Unfortunately, the text database cannot be used!

If apache is built on the windos platform, we still need to note that apache runs the system permission by default, which is terrible, which makes people feel uncomfortable. let's drop apache permissions.

Net user apache fuckmicrosoft/add

Net localgroup users apache/del

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

Open the computer manager, select a service, click the apache service attribute, Select log on, select this account, fill in the account and password created above, 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 execute what we want it 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.