Difference between revisions of "Configuring Clamav Ubuntu Gutsy"

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=== Create ruleset ===
 
=== Create ruleset ===
−
To create a ruleset which controls the virus protection of the Scalix server, create a file in the directory '''/var/opt/scalix/<instance>/s/rules/''' called '''ALL-ROUTES.VIR''':
+
To create a ruleset which controls the virus protection of the Scalix server, create a file in the directory '''/var/opt/scalix/<instance>/s/rules/''' called '''ALL-ROUTES.VIR'''. This file should contain the following two lines:
 +
<pre>
 +
VIRUS-UNCLEANED=1 ACTION=REJECT NDN-INFO=ndninfo.txt
 +
VIRUS-UNCLEANED=0 VIRUS-FOUND=1 ACTION=ALLOW NOTIFY="A virus was found in your message. It was successfully cleaned and sent to the recipient. However we highly recommend that you install or update your virus protection software and scan your computer for viruses."
 +
</pre>
 +
 
 +
=== Create non-delivery-notice ===
 +
Next create a non-delivery-notice, a text file with the message to be sent if a virus was found. This file should be called '''ndninfo.txt''' and should be created in the folder '''/var/opt/scalix/<instance>/s/rules/'''. This '''ndninfo.txt''' file should contain this text:
 +
<pre>
 +
Text = A virus was detected in your message and could not be cleaned, therefore it was not delivered. We highly recommend that you install or update you virus protection software.
 +
</pre>
  
  

Revision as of 21:05, 3 February 2008

Important Note

Please note that these manual installation instructions should only be used on Ubuntu distributions, such as Ubuntu Gutsy Gibbon 7.10 server, the distribution the document was written for. If you install Scalix on an unsupported platform, this invalidates your ability to receive Scalix support. Thank you for your understanding and compliance.

This document might be inaccurate and under construction. Do not trust this document.


Configuring Clamav on Ubuntu 7.10 Server (Gutsy Gibbon)

As Ubuntu 7.10 is an unsupported platform there is currently no manual describing the configuration of Clamav (an advanced anti-virus solution) to be used with Scalix. As I managed to get Scalix it up and running and I already documented and shared this with the community (here), I thought it would be useful to share my experiences regarding the Clamav configuration as well.

So below you'll find a how-to that describes the configuration of Clamav to be used with Scalix on a Ubuntu 7.10 server.

Clamav (Clam AntiVirus) is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates.

I used several sources of information on the web. I listed the ones I can remember at the end of the document under Sources.


Applicable Environments

These Installation instructions have been tested with

  • Scalix CE 11.3.0
  • Ubuntu 7.10 Server (Gutsy Gibbon)

They might not apply unmodified to any other version of Scalix or Ubuntu.


Install the Clamav software

Clamav is Open Source Software available on the internet here. nder Ubuntu we have a package available that can be installed directly with apt-get, but unfortunately the 'standard' package contains an outdated version. No worries, to get an actual version, we can use the repository available here. To do so, add the following line to the file /etc/apt/sources.list: 

deb http://ppa.launchpad.net/ubuntu-clamav/ubuntu gutsy main

Afterwards, run: 

sudo apt-get update

sudo apt-get install clamav-base clamav clamav-daemon clamav-freshclam


Add clamav user to the Scalix group

For Clamav to be able to cooperate with Scalix, you should add the Clamav user clamav to the SCalix group Scalix. Do this by editing /etc/group with your favorite editor, in this example vi is used, but feel free to use whatever editor you like. Edit the /etc/group file: 

sudo vi /etc/group

To add the clamav user to the scalix group, add clamav to the line: 

scalix:x:120:

This is what the result should look like: 

scalix:x:120:clamav


Configure Clamav

Create ruleset

To create a ruleset which controls the virus protection of the Scalix server, create a file in the directory /var/opt/scalix/<instance>/s/rules/ called ALL-ROUTES.VIR. This file should contain the following two lines: 

VIRUS-UNCLEANED=1 ACTION=REJECT NDN-INFO=ndninfo.txt
VIRUS-UNCLEANED=0 VIRUS-FOUND=1 ACTION=ALLOW NOTIFY="A virus was found in your message. It was successfully cleaned and sent to the recipient. However we highly recommend that you install or update your virus protection software and scan your computer for viruses."

Create non-delivery-notice

Next create a non-delivery-notice, a text file with the message to be sent if a virus was found. This file should be called ndninfo.txt and should be created in the folder /var/opt/scalix/<instance>/s/rules/. This ndninfo.txt file should contain this text: 

Text = A virus was detected in your message and could not be cleaned, therefore it was not delivered. We highly recommend that you install or update you virus protection software.


Configure sendmail

To make sendmail use spamassassin to filter all mail passing by, another file needs to be added to the /etc/mail/sendmail.mc. Add this line at the end of the file: 

INPUT_MAIL_FILTER(`spamassassin',`S=local:/var/run/spamass/spamass.sock, F=, T=C:15m;S:4m;R:4m;E:10m')dnl

Now use the M4 macro processor to translate the /etc/mail/sendmail.mc file into a format sendmail understands (/etc/mail/sendmail.cf). This can be taken out by: 

sudo bash -c "cd /etc/mail/ && m4 sendmail.mc > sendmail.cf"

Configure spamassassin

To make spamassassin run in daemon mode, you'll have to edit the configuration files: /etc/default/spamassassin and /etc/default/spamass-milter.

In the file /etc/default/spamassassin you have to change the line ENABLED=0 into ENABLED=1. After that the file should look like this: 

# /etc/default/spamassassin
# Duncan Findlay

# WARNING: please read README.spamd before using.
# There may be security risks.

# Change to one to enable spamd
ENABLED=1

# Options
# See man spamd for possible options. The -d option is automatically added.

# SpamAssassin uses a preforking model, so be careful! You need to
# make sure --max-children is not set to anything higher than 5,
# unless you know what you're doing.

OPTIONS="--create-prefs --max-children 5 --helper-home-dir"

# Pid file
# Where should spamd write its PID to file? If you use the -u or
# --username option above, this needs to be writable by that user.
# Otherwise, the init script will not be able to shut spamd down.
PIDFILE="/var/run/spamd.pid"

# Set nice level of spamd
#NICE="--nicelevel 15"

# Cronjob
# Set to anything but 0 to enable the cron job to automatically update
# spamassassin's rules on a nightly basis
CRON=0

In the file /etc/default/spamass-milter you have to change the line OPTIONS="-u spamass-milter -i 127.0.0.1" into OPTIONS="-u spamass-milter". After that the file should look like this: 

# spamass-milt startup defaults

# OPTIONS are passed directly to spamass-milter.
# man spamass-milter for details

# Default, use the nobody user as the default user, ignore messages
# from localhost
OPTIONS="-u spamass-milter"

# Reject emails with spamassassin scores > 15.
#OPTIONS="-r 15"

# Do not modify Subject:, Content-Type: or body.
#OPTIONS="-m"

######################################
# If /usr/sbin/postfix is executable, the following are set by
# default. You can override them by uncommenting and changing them
# here.
######################################
# SOCKET="/var/spool/postfix/spamass/spamass.sock"
# SOCKETOWNER="postfix:postfix"
# SOCKETMODE="0660"
######################################


Start spamassassin and restart sendmail and Scalix smtp services

First let's start the spamassassin services, do so using the following commands: 

sudo /etc/init.d/spamassassin start
sudo /etc/init.d/spamass-milter start

Next, let's restart the sendmail daemon: 

sudo /etc/init.d/sendmail start

And last but not least, restart the Scalix smtp service. To do this, you'll first have to stop the Scalix smtpd via this command: 

sudo /opt/scalix/omoff -w -d 0 smtpd

After the service has been stopped successfully, you can start it again by invoking: 

sudo /opt/scalix/omon smtpd


Check the spamassassin configuration

Next, to check the configuration, have a look at the log file /var/log/mail.log. You can check it by using: 

tail -400 /var/log/mail.log

If the spamassassin configuration is working correctly this type of output should appear in the mail.log file: 

Feb  3 19:26:40 shrek2 spamd[26614]: prefork: child states: II
Feb  3 19:26:41 shrek2 spamd[26618]: spamd: connection from localhost [127.0.0.1] at port 34577
Feb  3 19:26:41 shrek2 spamd[26618]: spamd: still running as root: user not specified with -u, not found, or set to root, falling back to nobody
Feb  3 19:26:41 shrek2 spamd[26618]: spamd: processing message <4IX408EJXVWDA658@igsnow.com> for max.wiertz:65534
Feb  3 19:26:52 shrek2 spamd[26618]: spamd: identified spam (15.5/5.0) for max.wiertz:65534 in 10.2 seconds, 1908 bytes.
Feb  3 19:26:52 shrek2 spamd[26618]: spamd: result: Y 15 - RAZOR2_CF_RANGE_51_100,RAZOR2_CF_RANGE_E4_51_100,RAZOR2_CHECK,RCVD_IN_BL_SPAMCOP_NET,RCVD_IN_PBL,RCVD_IN_SORBS_DUL,RCVD_IN_XBL,RDNS_NONE,SUSPICIOUS_RECIPS,URIBL_SBL scantime=10.2,size=1908,user=max.wiertz,uid=65534,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=34577,mid=<4IX408EJXVWDA658@igsnow.com>,autolearn=failed

If there's something wrong, have a look at the exact error message and fix the problem. If everything is all right, then you're done: congratulations!


Sources


The author

The origin for this document was written by Max Wiertz. As a Scalix newbie, I invested a lot of work in getting Scalix together with Clamav to work for me on Ubuntu. I felt like sharing this with all of you, so you can probably take advantage of it.

If you have any questions, remarks, comments or suggestions regarding this document, do not hesitate to contact me by e-mail: mailto:max_DOT_wiertz_AT_gmail_DOT_com.

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