PHP Security: Limit Resources Used By Script

How do I control and put limits on php scripts such as maximum execution time of each script and upload file size?

PHP supports the following resource limits directives in php.ini file:

  1. max_execution_time : Maximum execution time of each script, in seconds.
  2. max_input_time : Maximum amount of time each script may spend parsing request data.
  3. memory_limit : Maximum amount of memory a script may consume.

Edit php.ini, enter:
# vi /etc/php.ini
Set up values as follows:

max_execution_time =  30
max_input_time = 30
memory_limit = 40M

Set maximum size of POST data that PHP will accept:

post_max_size = 8M

Set maximum allowed size for uploaded files:

upload_max_filesize = 2M

Turn on or off HTTP file uploads (disallow uploading unless necessary):

file_uploads = Off

Make sure PHP redirects appropriately with the following:

cgi.force_redirect = 0

Disable file requests as fopen calls with the following

allow_url_fopen = Off

Turn on SQL safe mode:

sql.safe_mode = O

Reload Apache web server:
# service httpd reload
OR
Reload lighttpd web server:
# /etc/init.d/lighttpd reload

Was this answer helpful?

 Print this Article

Also Read

Bash Shell Generate Random Numbers

How do I create or generate random numbers (sequence of numbers that lack any pattern), under...

Change Hostname / Reverse DNS (rDNS) / PTR

To change rDNS/PTR/hostname, please perform these steps: Login to the Clients Area; At the...

Linux Default Services Which Are Enabled at Boot

Can you provide a guidance on default CentOS / Fedora / RHEL / Redhat enterprise Linux services...

iptables: Unknown error 18446744073709551615

When trying to run an OpenVPN Server and you receive the following error: iptables: Unknown...

Linux/UNIX: Configure OpenSSH To Listen On an IPv6 Address

How do I enable OpenSSH SSH server to listen on an IPv6 address under Linux or UNIX operating...