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These are all fairly self-explanatory; more details are available in the clamav.conf file that comes with ClamAV and the ClamAV documentation. You have now configured clamd. You will want to start clamd automatically when your system starts (before you start your MTA). A variety of example init scripts are available in the ClamAV source distribution in the contrib/init directory, which you can use to create your own init script. The last step in configuring ClamAV is to ensure your virus database is kept up-to-date. For this, you use the freshclam daemon. This is located in the /usr/local/bin directory by default. You can run it from the command line, run it via an init script, or run it from cron at scheduled intervals. You can also start it as a daemon in its own right which is how I recommend you run it. It is controlled by a configuration file, freshclam.conf, which is located in /usr/local/etc. Listing 7-46 shows the freshclam.conf file. Listing 7-46. The freshclam.conf File #Example DatabaseDirectory /var/lib/clamav DatabaseOwner clamav DatabaseMirror database.clamav.net MaxAttempts 3 UpdateLogFile /var/log/freshclam.log LogVerbose NotifyClamd /usr/local/etc/clamav.conf As with the clamav.conf file, you first need to delete or comment out the Example line. The next line marks the location of the ClamAV virus database. By default this should install to /var/lib/clamav. Override this only if you have changed the database s location. Next you specify the owner of the database, which is the user you created previously, clamav, and then the location of the download mirror for the ClamAV database. You should not need to change this. The MaxAttempts variable sets the maximum number of times freshclam should retry to download the virus database if it fails. I have next specified a logfile located in /var/log and called freshclam.log to record the details of any update attempts. I initially enabled the option LogVerbose to test freshclam, but you can take this out once you are sure freshclam is working. The last option, NotifyClamd, tells the daemon about a new database being downloaded. Just point it to the location of your clamav.conf file; by default and here this is /usr/local/etc/clamav.conf.
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CHAPTER 7 s SECURING YOUR MAIL SERVER
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I recommend you run freshclam as a daemon. Listing 7-47 shows the command line you use to start freshclam as a daemon. Listing 7-47. Starting freshclam As a Daemon puppy# /usr/local/bin/freshclam -d -c 24 The first option, -d, tells freshclam to go into daemon mode. The second option, -c, tells freshclam the frequency of its checks. In this case you have 24 times a day or once an hour. This is probably the most frequently you will need to update your virus database. Any more frequent updates could put an undue load on the database site. If you want to start freshclam when your system boots, then sample init scripts are available in the ClamAV source distribution in the contrib/init directory. Your ClamAV setup is now complete, and you can now proceed to integrate your antivirus scanner with your MTA.
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I will use milter, which is the Mail Filtering API that has supported by Sendmail since version 8.10, to integrate ClamAV with Sendmail. This API communicates with Sendmail using sockets and is enabled by defining filters in your sendmail.mc file. The milter functionality comes with Sendmail by default but may not have been compiled into your version of Sendmail. A quick way to check this is to run the following: puppy# sendmail -d0 < /dev/null | grep MILTER If your Sendmail binary supports milter, it should return something like this: Compiled with: DNSMAP LOG MATCHGECOS MILTER MIME7TO8 MIME8TO7 If it does not return MILTER in the Compiled with options, you need to enable milter support by adding the following line to your site.config.m4 file. APPENDDEF enables the mail filter interface. Enter the following: APPENDDEF(`confENVDEF', `-DMILTER') Now rebuild Sendmail with the Build -c option. You also need the libmilter library that comes with Sendmail. In your Sendmail source distribution, change into the libmilter directory and run the following: puppy# ./Build install
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