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Subject: Ban File Extensions Using Pure-ftpd to limit file types

Pure-ftpd has no direct support to prevent files with certain
extensions from being uploaded. But itβs possible to accomplish this
goal using a pure-ftp feature. pure-ftpd has a post-upload program that
runs after each file is successfully uploaded and can run an external
program. Hereβs the excerpt from the pure-ftpd manual:

NAME

pure-uploadscript - Automatically run an external program after a successful upload

SYNTAX

pure-uploadscript [-p ] [-B] [-g ] [-h] -r [-u ]

So the program to run in our case can be a simple Bash script Iβm going to call ban.sh

#!/bin/bash

uploaded_file=${1};

banned_extensions="zip tar rar";

for ext in ${banned_extensions};

do

count=$(echo ${uploaded_file}|grep -i ${ext}$|wc -l);

if [ "${count}" -gt "0" ];

then

rm -f ${uploaded_file}; # File with banned extension detected. Delete it.

break;

fi;

done

So you start the program in the background like this:

pure-uploadscript -p /var/run/pure-ftpd.pid -B -r /root/ban.sh

More information here: http://linux.die.net/man/8/pure-uploadscript

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