Blue Flower

Sunday, 05 July 2015 13:21

Installing ClamAV

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Clam Antivirus is command line virus scanner written entirely in C and its database is kept up to date. For more information, Please see: http://www.clamav.net/

Installing clamav


# cd /usr/ports/security/clamav
# make install clean

Make sure the following are checked:

ARC
ARJ
DMG_XAR
DOCS
IPV6 (Optional)
LHA
LLVM
UNRAR
UNZOO

Now we want to create the clamav and freshclam service scripts:


# mkdir -m 1755 /var/qmail/supervise/clamav
# mkdir -m 1755 /var/qmail/supervise/freshclam
# mkdir -m 755 /var/qmail/supervise/clamav/log
# mkdir -m 755 /var/qmail/supervise/freshclam/log
# mkdir -m 1755 /var/log/qmail/clamav
# mkdir -m 1755 /var/log/qmail/freshclam
# cd /var/qmail/supervise/clamav
# fetch http://freebsdrocks.net/files/clamav-run
# mv clamav-run run
# chmod 755 run
# cd log
# fetch http://freebsdrocks.net/files/log-run
# mv log-run run
# chmod 755 run
# vi run

Change the last line to read /var/log/qmail/clamav like so

exec /usr/local/bin/multilog t n20 s1048576 /var/log/qmail/clamav


# cd /var/qmail/supervise/freshclam
# fetch http://freebsdrocks.net/files/freshclam-run
# mv freshclam-run run
# chmod 755 run
# cd log
# fetch http://freebsdrocks.net/files/log-run
# mv log-run run
# chmod 755 run
# vi run

Change the last line to read /var/log/qmail/clamav like so

exec /usr/local/bin/multilog t n20 s1048576 /var/log/qmail/freshclam

Now we need to edit the clamd.conf file so it will run correctly via daemontools:


# vi /usr/local/etc/clamd.conf

#Example - must be commented out or removed
#LogFile - multilog will handle logging
#LogSysLog no - see LogFile
PidFile /var/run/clamav/clamd.pid
DatabaseDirectory /var/db/clamav
FixStaleSocket yes - optional
User - should be uncommented and set to qscand
Foreground yes - required to run clamav via daemontools

Now we need to edit the freshclam.conf file so it will run correctly via daemontools:


# vi /usr/local/etc/freshclam.conf

# Example
DatabaseDirectory /var/db/clamav
# UpdateLogFile - multilog will handle logging
# LogSyslog no - see UpdateLogFile
PidFile /var/run/clamav/freshclam.pid
DatabaseOwner - change from clamav to qscand
Foreground yes - required to run freshclam via daemontools

For your information when this is setup, freshclam is going to run every 2 hours by default. If you want to change it so it more or less frequent, just change this section in freshclam.conf


# Number of database checks per day.
# Default: 12 (every two hours)
# Checks 24

Now to set some file permissions before we start clamav:


# chown -R qscand:qscand /var/log/clamav
# chown -R qscand:qscand /var/run/clamav/
# chown qscand:qscand /var/db/clamav/

Now to create the symlinks to the service:


# ln -s /var/qmail/supervise/clamav /service/
# ln -s /var/qmail/supervise/freshclam /service/

Note: I want to point out before you run the next command that it could take some time for the clamav service to come up due to the updates for freshclam being downloaded. This is normal and it could take several seconds or several minutes for freshclam to update clamav. Don't panic if clamav is stuck at 0 or 1. Just check the freshclam logs to find out when the download is complete and it says it has notified clamav of the database update.

Check to see if clamav and freshclam are running:


# svstat /service/clamav/ /service/clamav/log

/service/clamav: up (pid 82396) 63 seconds
/service/clamav/log: up (pid 82446) 25 seconds

# svstat /service/freshclam/ /service/freshclam/log

/service/freshclam/: up (pid 82409) 69 seconds
/service/freshclam/log: up (pid 82410) 69 seconds

Now to remove the startup scripts:


# rm /usr/local/etc/rc.d/clamav-clamd
# rm /usr/local/etc/rc.d/clamav-freshclam

Sunday, 05 July 2015 13:21

Installing SpamAssassin

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SpamAssassin is a mail filter which attempts to identify spam using text analysis and several internet-based realtime blacklists.

The official SpamAssassin website is at http://spamassassin.apache.org/

When we install SpamAssassin from ports, it installs all the required Perl Modules for us which makes installing SpamAssassin really, Really easy! Start be doing the following:


# cd /usr/ports/mail/spamassassin
# make install

When you run this, You will get a pop-up box asking to enable a few things. Lets just make sure the settings below are checked. To check the setting, Just hit the spacebar when the cursor is over the selected option:

AS ROOT
GNUPG

We will now want to double-check the perl dependancies after SpamAssassin is installed. When you install SpamAssassin via ports, it will check to see if it needs to install any of the required perl dependancies which makes things easy to install and setup. Please change the version of SpamAssassin in the command below. For instance if you are running SpamAssassin 3.1.0, you would substitute 3.1.0 for the 3.x.x in the following command:


# /usr/ports/mail/spamassassin/work/Mail-SpamAssassin-3.x.x/build/check_dependencies

You will get a pretty large output. Don't worry about any optional modules unless you want to install and use them. The optional modules are configured in /usr/local/etc/mail/spamassassin/v310.pre. All you need to do is install the perl module for it and then uncomment it in v310.pre. Pretty easy to do. I have you run this because if it shows something OTHER than the optional modules, you may just want to reinstall the spamassassin port again. If you reinstall and it still doesn't work, I would suggest looking at the support options on the left.

here are the port locations for the optional plugins:

Digest::SHA1 - /usr/ports/security/p5-Digest-SHA1
Mail::SPF - /usr/ports/mail/p5-Mail-SPF
Geo::IP - /usr/ports/net/p5-Geo-IP
Net::CIDR::Lite - /usr/ports/net/p5-Net-CIDR-Lite
IO::Socket::INET6 - /usr/ports/net/p5-IO-Socket-INET6
Mail::DKIM - /usr/ports/mail/p5-Mail-DKIM
DBI - /usr/ports/databases/p5-DBI
LWP::UserAgent - /usr/ports/www/p5-LWP-UserAgent-POE
Net::Patricia - /usr/ports/net/p5-Net-Patricia

After running the above command, lets clean up the install:


# cd /usr/ports/mail/spamassassin
# make clean

Configuring SpamAssassin

If you cd to /usr/local/etc/mail/spamassassin/, you will see 4 files. Two of them are .sample files and the 2 others are your SpamAssassin global options. init.pre and v310.pre have many different options to choose from. Enable them at your leisure. We will not be going over them as they are optional settings.

What we need to do is get local.cf setup so run the following:


# cd /usr/local/etc/mail/spamassassin/
# cp local.cf.sample local.cf
# vi local.cf

In local.cf we want to set a few options in here. I will list them individually:

rewrite_header Subject - Leave this commented (#). We will configure qmail-scanner to rewrite the subject for us.
report_safe - Leave this commented. This just leaves the message as Spam or Ham and does not save it as an attachment.
trusted_networks - Leave this commented. We define this globally in qmail in the /etc/tcp/smtp file.
lock_method flock - Leave this commented.
required_score - Uncomment this and set this to around 4.3 or so. I have mine set at 3.9 right now and seems to be catching a lot of spams.
use_bayes - Leave this commented. We will get to this later.

We are now going to run SpamAssassin via daemontools:


# mkdir -m 1755 /var/qmail/supervise/spamd
# mkdir -m 755 /var/qmail/supervise/spamd/log
# cd /var/qmail/supervise/spamd
# fetch http://freebsdrocks.net/files/spamd-run
# mv spamd-run run
# chmod 755 run
# cd log
# fetch http://freebsdrocks.net/files/log-run
# mv log-run run
# chmod 755 run
# mkdir /var/log/qmail/spamd
# vi run

In the run file change the last line to match the following:

exec /usr/local/bin/multilog t n20 s1048576 /var/log/qmail/spamd

Before we run the symlink to the SpamAssassin service, you are required to do an initial run of sa-update before doing so. Run the following command:


# /usr/local/bin/sa-update

Now we can create the service:


# ln -s /var/qmail/supervise/spamd /service/

After a few seconds run:


# svstat /service/spamd/ /service/spamd/log/

And you should see something like:


/service/spamd/: up (pid 50481) 4 seconds
/service/spamd/log/: up (pid 50482) 4 seconds

We now want to check and see if spamassassin has any errors. Run the following command:


# spamassassin --lint

The first time you run it, you might see

warn: config: created user preferences file: /tmp/.spamassassin/user_prefs

This error is fine. it's just telling you it's creating a user_prefs file for username qscand.

If you don't get any errors, SpamAssassin is configured correctly!

Now we need to remove the startup script in /usr/local/etc/rc.d:


# rm /usr/local/etc/rc.d/sa-spamd

Thats it! SpamAssassin is installed, configured and also running.

Sunday, 05 July 2015 13:24

Configuring Qmail

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Getting this part of qmail going is, well, going to be a little rough. We need to download the scripts for qmail-smtpd, qmail-smtpd-ssl and qmail-send. We will start with making all the needed directories and stuff like that so lets get to it!


# cd ~root/qmail

The only change we will need to make in the smtpd_run file is the IP address. Change this to the local address of the server (or just the listening IP). All authentication services are disabled. By the end of this walkthrough you will have 2 secure SSL and TLS services. All mail will be filtered using RBLs, greylistiing and qmail-scanner to help thwart spam.

You will need to edit smtpd_run and change the IP Address:

IP=1.2.3.4

Now lets make the supervise directory and get everything copied over. The qmail.sh below has about 30 commands on copying the appropriate files into the correct folders. Please feel free to take a look at the qmail.sh file to see exactly what it's doing. It is copying all qmail-smtpd, qmail-smtpd-ssl and qmail-send run files for the service and log.


# ./qmail.sh

Now lets setup some qmail aliases. Replace This email address is being protected from spambots. You need JavaScript enabled to view it. in the next three lines with the address you want the emails to go to:


# echo This email address is being protected from spambots. You need JavaScript enabled to view it. > /var/qmail/alias/.qmail-root
# echo This email address is being protected from spambots. You need JavaScript enabled to view it. > /var/qmail/alias/.qmail-postmaster
# echo This email address is being protected from spambots. You need JavaScript enabled to view it. > /var/qmail/alias/.qmail-mailer-daemon

Now we want to setup selective relaying:


# mkdir /etc/tcp/
# cd /etc/tcp
# fetch http://freebsdrocks.net/files/etc-tcp-makefile
# mv etc-tcp-makefile Makefile

Now we need to create the smtp file

At this point it should be ready to go. All you need to do is create the "smtp" file, containing the normal access control list. You may want to add the IP of the server you specified in the /var/qmail/supervise/qmail-smtpd/run file in the /etc/tcp/smtp file. Lets say the IP you used was 192.168.9.1. The line should look like this:


192.168.9.1:allow,RELAYCLIENT=""

This is what a typical smtp file should look like:


# vi /etc/tcp/smtp

Add the following to /etc/tcp/smtp:


192.168.9.:allow,RELAYCLIENT=""
:allow

Now run:


# gmake

and you should get an output saying:


tcprules smtp.cdb smtp.tmp < smtp
chmod 644 smtp.cdb smtp

Now to continue on.

Sunday, 05 July 2015 13:24

Disabling Sendmail

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Type in the following commands to eliminate sendmail from being called on your box:


# killall sendmail
# mv /usr/sbin/sendmail /usr/sbin/sendmail.old
# chmod 0 /usr/sbin/sendmail.old

To tell FreeBSD not to tell sendmail to start on boot, add this to /etc/rc.conf like so:


# echo "sendmail_enable=NONE" >> /etc/rc.conf
# echo "sendmail_submit_enable=NO" >> /etc/rc.conf
# echo "sendmail_outbound_enable=NO" >> /etc/rc.conf
# echo "sendmail_msp_queue_enable=NO" >> /etc/rc.conf

Now to tell sendmail not to interfere with your qmail setup, add this to your /etc/make.conf like so:


# echo "NO_SENDMAIL=yes" >> /etc/make.conf
# echo "NO_MAILWRAPPER=yes" >> /etc/make.conf

Now lets tell anything that calls sendmail from the common location that we want it to send to qmail instead:


# ln -s /var/qmail/bin/sendmail /usr/sbin/sendmail
# ln -s /var/qmail/bin/sendmail /usr/lib/sendmail

If you are using periodic.conf for your system messages you should also disable clean-purgestat from it. Open up /etc/periodic.conf and edit the following line as follows:

# 150.clean-hoststat
daily_clean_hoststat_enable="NO"                        # Purge sendmail host

That is it. Sendmail is uninstalled!

Sunday, 05 July 2015 13:25

Installing Maildrop

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Maildrop is a replacement for your local mail delivery agent. I have configured maildrop (in my previous qmail installs) to filter all Spam related emails to go directly to the users Maildir/Spam folder. This no longer works. We now just need to install maildrop for qmail-scanner support. Mails are now filtered via dovecot 2. For more information, please see http://www.courier-mta.org/maildrop/

Lets install maildrop:


# cd /usr/ports/mail/maildrop
# make install clean

Make sure the following option is checked:

[X] AUTH_VCHKPW  popmail/vchkpw support

We need to run a quick fix for vdeliverquota


# ln -s /usr/local/bin/maildrop-deliverquota /usr/local/bin/deliverquota

You can now proceed to the next step!

Sunday, 05 July 2015 13:26

Configuring Validrcptto to fight spam

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Configuring validrcptto

The most common questions I receive about the validrcptto.cdb patch involve how to create the validrcptto.cdb file in the first place, or how to use the same file on multiple servers. The mkvalidrcptto script can be a major part of the answer to both questions. This web page will show how I'm using mkvalidrcptto on my own server.

It should be noted that you are not required to use mkvalidrcptto in order to benefit from the validrcptto.cdb patch- any mechanism which produces a list of all valid email addresses on your system will work, even something as simple as manually editing a text file with one email address on each line. As long as you correctly turn this text file into a cdb file, it will work.

Before you install the script, there are a few other packages which need to be installed on the system. The first is djb's cdb library and tools, which contains the cdbmake-12 program, which converts a text file into a cdb file. This package should be installed using the directions on djb's web site. A quick walk-through is shown here:

So lets install it!


# cd /usr/ports/databases/cdb
# make install clean

Installing the CDB_File module

The mkvalidrcptto script reads several cdb files in order to do its job, which means that you need to install the CDB_File perl module, available through CPAN, the Comprehensive Perl Archive Network, which is an archive of Perl modules which are not included with Perl itself, but which others have decided to share in the hope that they will prove useful.

This is a quick walk-through of how to install the module.


# perl -MCPAN -e shell

If you have never run the CPAN shell before, just hit enter a few times and it will drop you right to the CPAN prompt.


cpan> install CDB_File

cpan> exit
# exit

Now to copy over validrcptto:


# cd /usr/local/bin
# cp ~root/qmail/mkvalidrcptto .
# chmod 755 mkvalidrcptto

One thing that wouldn't hurt is to make sure that your installation of perl is happy with the script and can find the modules. You can do this by running this command as a non-root user:


# perl -c /usr/local/bin/mkvalidrcptto
/usr/local/bin/mkvalidrcptto syntax OK

You should then run it once as root and make sure the output makes sense for your system. The output should be a list of every valid email address on your system, one on each line.


# mkvalidrcptto
This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.
@domain2.xyz
This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.
...

Scripting for one system

The mkvalidrcptto script itself just reads the information it needs from your system and prints a list of email addresses. The other half of the equation is turning that list of email addresses into a validrcptto.cdb file, so that qmail-smtpd can use it. The original versions of mkvalidrcptto worked by simply printing the list of email addresses, and relied on another program called cdbmake-12 to produce the actual validrcptto.cdb file. However, as of 2007-06-06, mkvalidrcptto can write the validrcptto.cdb file by itself. This makes the scripting much simpler. The most basic way to create the validrcptto.cdb file would look like this:


# cd /var/qmail/control
# mkvalidrcptto -c validrcptto.cdb

The idea situation would be to have vpopmail run a certain command whenever it changes something. When John Simpson originally wrote this page, vpopmail did not have that kind of hook, however I have since written a patch for vpopmail called the ONCHANGE patch, which is officially part of vpopmail as of vpopmail version 5.4.15.

It is possible to write a script like the one below, which can run as a cron job, in response to an ONCHANGE event, or as part of a general qmail-updater service, to rebuild the validrcptto.cdb file.


#!/bin/sh
PATH=/usr/bin:/bin:/usr/local/bin:/var/qmail/bin

umask 022
mkvalidrcptto -c /var/qmail/control/validrcptto.cdb

If you're reading this and understand how onchange works, you only need to run the "mkvalidrcptto -c validrcptto.cdb" inside the /var/qmail/control directory just once as once onchange is enabled, it will take care of any of the updates. I just wanted you as the user to understand how validrcptto works and understand it.

Now your validrcptto is setup and configured. Now to setup maildrop!

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