Installazione Clamav in Debian

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Installazione

Debian Squeeze

  • Aggiungere la fonte, se non già presente:
sudoedit /etc/apt/sources.list

...
deb http://ftp.it.debian.org/debian             squeeze-updates main contrib non-free
deb http://security.debian.org/                 squeeze/updates main contrib non-free
...


  • Installare
sudo apt-get update && \
sudo apt-get dist-upgrade && \
sudo apt-get install clamav-daemon libclamunrar6


Debian >= Wheezy

  • Installare
sudo apt-get update && \
sudo apt-get dist-upgrade && \
sudo apt-get install clamav clamav-daemon libclamunrar7


Installazione firme aggiuntive

  • Installare il pacchetto RVM, oppure installare dai sorgenti
sudo apt-get install clamav-unofficial-sigs
  • Inserire il receipt number in:
sudoedit /etc/clamav-unofficial-sigs/master.conf 

malwarepatrol_receipt_code="xxxxxxxxxxx"
  • Inserire il proprio indicativo contenuto negli url indicati nella tab SETUP del sito, esempio
http://www.securiteinfo.com/get/signatures/a583f5d7113477f99ac6f2f99011897a80399b63212d5cb234c85a84ac7dd3456bd5dfc33a01dab5c31f5bf7b20b2026b6e2c961727adf85777564f9c82abc03/securiteinfo.hdb

sudoedit /etc/clamav-unofficial-sigs/master.conf 

securiteinfo_authorisation_signature="a583f5d7113477f99ac6f2f99011897a80399b63212d5cb234c85a84ac7dd3456bd5dfc33a01dab5c31f5bf7b20b2026b6e2c961727adf85777564f9c82abc03"
  • Attenzione questo codice vale solo per 1 indirizzo IP
  • Scaricare le firme la prima volta come root, poi come clamav:
sudo /bin/bash /usr/sbin/clamav-unofficial-sigs
sudo sudo -u clamav [ -x /usr/sbin/clamav-unofficial-sigs ] && /bin/bash /usr/sbin/clamav-unofficial-sigs

Configurazione

  • Per il funzionamento con amavis, impostare:
sudoedit  /etc/clamav/clamd.conf

AllowSupplementaryGroups true
Altrimenti la scansione di amavis fallisce con clamd, e si ottiene l'errore:
Mar 11 18:59:40 myserver amavis[18226]: (18226-03) (!)run_av (ClamAV-clamd) FAILED - unexpected , output="/var/lib/amavis/tmp/amavis-20160311T185044-18226-VIje1ebd/parts: lstat() failed: Permission denied. ERROR\n"
  • Impostare lo scaricamento delle signatures di Google Safebrowsing per i siti di Phishing e malware:
sudoedit /etc/clamav/freshclam.conf

SafeBrowsing Yes
  • Riavviare clamav-daemon:
sudo /etc/init.d/clamav-daemon stop; sudo /etc/init.d/clamav-daemon start
  • Se necessario, impostare un proxy per lo scaricamento degli aggiornamenti:
sudoedit /etc/clamav/freshclam.conf 

HTTPProxyServer proxy.metrica.priv
HTTPProxyPort 3128
  • Fermare il daemon di aggiornamento
sudo /etc/init.d/clamav-freshclam stop
  • Aggiornare il database, e verificare che scarichi anche le firme di Google Safebrowsing:
sudo freshclam -v
  • Riattivare il daemon di aggiornamento
sudo /etc/init.d/clamav-freshclam start

Test Clamav

  • Installare i test files:
sudo apt-get install clamav-testfiles

clamscan /usr/share/clamav-testfiles/

----------- SCAN SUMMARY -----------
Known viruses: 8484890
Engine version: 0.99.2
Scanned directories: 1
Scanned files: 46
Infected files: 46
Data scanned: 13.76 MB
Data read: 6.21 MB (ratio 2.22:1)
Time: 23.877 sec (0 m 23 s)
  • Verificare se utilizza le firme di Safebrowsing:
cat > /tmp/test-safebrowsing <<EOFile
Return-Path: <username@example.com>
Delivered-To: <destination@example.com>
Received: from servername.example.com
	by servername.example.com (Dovecot) with LMTP id xI3QK3XIrVjAYAAA25iMvQ
	for <destination@example.com>; Wed, 22 Feb 2017 18:20:53 +0100
Date: Wed, 22 Feb 2017 18:20:58 +0100
To: destination@example.com
From: username@example.com
Subject: test Wed, 22 Feb 2017 18:20:58 +0100
X-Mailer: swaks v20130209.0 jetmore.org/john/code/swaks/
Message-Id: <20170222172053.A4DFADEAEA@servername.example.com>

http://www.ianfette.org/

EOFile

clamscan -v /tmp/test-safebrowsing

Scanning /tmp/test-safebrowsing
/tmp/test-safebrowsing: Heuristics.Safebrowsing.Suspected-phishing_safebrowsing.clamav.net FOUND

----------- SCAN SUMMARY -----------
Known viruses: 8484890
Engine version: 0.99.2
Scanned directories: 0
Scanned files: 1
Infected files: 1
Data scanned: 0.00 MB
Data read: 0.00 MB (ratio 0.00:1)
Time: 41.610 sec (0 m 41 s)
  • Rimuovere i testfiles:
 sudo apt-get remove --purge clamav-testfiles

Installazione decompressori

Debian Squeeze

sudo apt-get install unrar arj unzip unace

Debian >= Wheezy

sudo apt-get install unrar arj unzip unace-nonfree

Riferimenti

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