Three tips for effectively preventing PHP Trojan attacks _ PHP Tutorial

Three techniques to effectively prevent PHP Trojan attacks. As we all know, surfing the Internet must withstand viruses and Trojans to protect our clean surfing environment. Here, we will understand the defense measures for PHP Trojan attacks. as we all know, surfing the network must withstand viruses and Trojans to protect our clean surfing environment. Here, we will learn about the defense measures for PHP Trojan attacks and help us clean up the network environment.

　　1. prevent jumping out of the web Directory

To defend against PHP Trojan attacks, first 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. For example, if your web directory is/usr/local/apache/htdocs, add the following lines in httpd. conf:

Helper House www.bkjia.com

Php_admin_value open_basedir/usr/local/apache

/Htdocs

In this way, files other than/usr/local/apache/htdocs to be read by the script will not be allowed. 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 Trojan attacks and execute webshell

Enable safe_mode and set it 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, and system are followed by php file processing functions, mainly including:

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 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. However, this PHP Trojan attack defense method is a little useful to prevent such attacks.

Bytes. Here, you will learn about the defense measures for PHP Trojan attacks ,...