Three tips to effectively prevent PHP Trojan attacks_PHP Tutorial

Everyone knows that surfing on the Internet must withstand viruses and Trojan attacks to protect our clean surfing environment. Here, everyone will learn about the defensive measures against PHP Trojan attacks and help us purify 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 operation path of php. For example, if your web directory is /usr/local/apache/htdocs, then add these lines to httpd.conf:

Bkjia www.bkjia.com

　php_admin_value open_basedir /usr/local/apache

　/htdocs

In this way, if the script wants to read files other than /usr/local/apache/htdocs, it will not be allowed. If the error display is turned on, an error like this will be prompted:

Warning: open_basedir restriction in effect. File is in wrong directory in

　/usr/local/apache/htdocs/open.php on line 4

Wait.

　2. Prevent PHP Trojan attacks from executing webshell

Open safe_mode and set it in php.ini

Disable_functions= passthru, exec, shell_exec, system

You can choose one of the two, or you can choose both

　3. Prevent PHP Trojan attacks from reading and writing file directories

In php.ini, disable_functions= passthru, exec, shell_exec, and system are followed by PHP file processing functions, which mainly include:

　fopen, mkdir, rmdir, chmod, unlink, dir

　fopen, fread, fclose, fwrite, file_exists

　closedir, is_dir, readdir.opendir

fileperms.copy, unlink, delfile

It becomes

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, we’re done, the PHP Trojan can’t defeat us. Unfortunately, in this case, things that use text databases won’t work.

If the apache is built on the windos platform, we need to pay attention to one thing. By default, apache runs with system permissions, which is scary and makes people feel uncomfortable. Then we should lower the permissions of apache.

net user apache fuckmicrosoft /add

net localgroup users apache /del

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

We open the computer manager, select services, click on the properties of the apache service, we select log on, select this account, we fill in the account and password created above, restart the apache service, ok, apache runs under low privileges .

In fact, we can also set the permissions of each folder so that the apache user can only perform what we want it to do, and create a separate read-write user for each directory. This is also a popular configuration method used by many virtual host providers. However, this defense method for PHP Trojan attacks is overkill when used to prevent it.

http://www.bkjia.com/PHPjc/364398.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/364398.htmlTechArticleEveryone knows that surfing on the Internet must withstand viruses and Trojan attacks to protect our clean surfing environment . Here, you will learn about the defense measures against PHP Trojan attacks...