This tutorial explains how you can integrate ClamAV into PureFTPd for virus scanning on a Debian Squeeze system. In the end, whenever a file gets uploaded through PureFTPd, ClamAV will check the file and delete it if it is malware.
1 Preliminary Note
You should have a working PureFTPd setup on your Debian Squeeze server, e.g. as shown in this tutorial: Virtual Hosting With PureFTPd And MySQL (Incl. Quota And Bandwidth Management) On Debian Squeeze .
2 Installing ClamAV
ClamAV can be installed as follows:
apt-get install clamav clamav-daemon
3 Configuring PureFTPd
First we create the file /etc/pure-ftpd/conf/CallUploadScript which simply contains the string yes:
echo "yes" > /etc/pure-ftpd/conf/CallUploadScript
Next we create the file /etc/pure-ftpd/clamav_check.sh (which will call /usr/bin/clamdscan whenever a file is uploaded through PureFTPd)...
vi /etc/pure-ftpd/clamav_check.sh
#!/bin/sh /usr/bin/clamdscan --remove --quiet --no-summary "$1" |
... and make it executable:
chmod 755 /etc/pure-ftpd/clamav_check.sh
Now we edit /etc/default/pure-ftpd-common...
vi /etc/default/pure-ftpd-common
... and change the UPLOADSCRIPT line as follows:
[...] # UPLOADSCRIPT: if this is set and the daemon is run in standalone mode, # pure-uploadscript will also be run to spawn the program given below # for handling uploads. see /usr/share/doc/pure-ftpd/README.gz or # pure-uploadscript(8) # example: UPLOADSCRIPT=/usr/local/sbin/uploadhandler.pl UPLOADSCRIPT=/etc/pure-ftpd/clamav_check.sh [...] |
Finally we restart PureFTPd:
/etc/init.d/pure-ftpd-mysql restart
That's it! Now whenever someone tries to upload malware to your server through PureFTPd, the "bad" file(s) will be silently deleted.
4 Links
- PureFTPD: http://www.pureftpd.org/
- ClamAV: http://www.clamav.net/
- Debian: http://www.debian.org/