164 lines
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164 lines
8.3 KiB
HTML
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<title>Store SpamAssassin bayes in SQL</title>
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<a href="https://www.iredmail.org" target="_blank">
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src="./images/logo-iredmail.png"
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<span>iRedMail</span>
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// <a href="./index.html">Document Index</a></div><h1 id="store-spamassassin-bayes-in-sql">Store SpamAssassin bayes in SQL</h1>
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<div class="toc">
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<ul>
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<li><a href="#store-spamassassin-bayes-in-sql">Store SpamAssassin bayes in SQL</a><ul>
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<li><a href="#summary">Summary</a></li>
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<li><a href="#create-required-sql-database-used-to-store-bayes-data">Create required SQL database used to store bayes data</a></li>
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<li><a href="#enable-bayes-modules-in-spamassassin">Enable Bayes modules in SpamAssassin</a></li>
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<li><a href="#check-number-of-learned-spamshams">Check number of learned spams/hams</a></li>
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<li><a href="#auto-learn-spamham-with-dovecot-imap_sieve-plugin">Auto learn spam/ham with Dovecot imap_sieve plugin</a></li>
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<li><a href="#backup-your-sa_bayes-database">Backup your sa_bayes database</a></li>
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<li><a href="#references">References</a></li>
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</ul>
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</li>
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</ul>
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</div>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<p>The bayesian classifier can only score new messages after it already learn
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200 known spams and 200 known hams.</p>
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</div>
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<h2 id="summary">Summary</h2>
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<p>This article will guide you to configure related components to store
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SpamAssassin Bayes data in SQL server, and allow webmail users to report spam
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with one click.</p>
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<p>Tested with:</p>
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<ul>
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<li>iRedMail-0.8.0 and later releases</li>
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<li>CentOS 6.2 (x86_64)</li>
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<li>SpamAssassin-3.3.1</li>
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<li>Amavisd-new-2.6.6</li>
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<li>MySQL-5.1.61</li>
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<li>Roundcubemail-0.7.2</li>
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</ul>
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<p>Notes:</p>
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<ul>
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<li>This article should work with all iRedMail releases. We take iRedMail-0.8.0 for example.</li>
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<li>This article should work with all backends: OpenLDAP, MySQL, MariaDB, PostgreSQL. We take MySQL backend for example.</li>
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<li>This article should work with Amavisd-new-2.6.0 and later versions.</li>
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</ul>
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<p><strong>IMPORTANT NOTES</strong>:</p>
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<ul>
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<li>The bayesian classifier can only score new messages after it already learn
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known spams and 200 known hams.</li>
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<li>If Spamassassin fails to identify a spam, teach it so it can do better next
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time. e.g. Mark it as spam in roundcube webmail.</li>
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<li>Read <code>References</code> section at the end of this article before asking questions.</li>
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</ul>
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<h2 id="create-required-sql-database-used-to-store-bayes-data">Create required SQL database used to store bayes data</h2>
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<p>We need to create a SQL database and necessary tables to store SpamAssassin
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bayes data. The RPM package installed on CentOS 6 doesn't ship SQL template
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for bayes database, so we have to download it from Apache web site. We're
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running SpamAssassin-3.3.1, so what we need is this SQL template file:
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<a href="http://svn.apache.org/repos/asf/spamassassin/tags/spamassassin_release_3_3_1/sql/bayes_mysql.sql">http://svn.apache.org/repos/asf/spamassassin/tags/spamassassin_release_3_3_1/sql/bayes_mysql.sql</a>
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If you're running different version, please find the proper SQL file here:
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<a href="http://svn.apache.org/repos/asf/spamassassin/tags/">http://svn.apache.org/repos/asf/spamassassin/tags/</a>.</p>
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<pre><code># cd /root/
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# wget http://svn.apache.org/repos/asf/spamassassin/tags/spamassassin_release_3_3_1/sql/bayes_mysql.sql
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</code></pre>
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<p>Create MySQL database and import SQL template file:</p>
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<pre><code># mysql -uroot -p
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mysql> CREATE DATABASE sa_bayes;
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mysql> USE sa_bayes;
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mysql> SOURCE /root/bayes_mysql.sql;
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</code></pre>
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<p>Create a new MySQL user (with password <code>sa_user_password</code>) and grant
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permissions. <strong>IMPORTANT NOTE</strong>: Please replace password <code>sa_user_password</code>
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by your own password.</p>
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<pre><code>mysql> GRANT SELECT, INSERT, UPDATE, DELETE ON sa_bayes.* TO sa_user@localhost IDENTIFIED BY 'sa_user_password';
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mysql> FLUSH PRIVILEGES;
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</code></pre>
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<h2 id="enable-bayes-modules-in-spamassassin">Enable Bayes modules in SpamAssassin</h2>
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<p>Edit <code>/etc/mail/spamassassin/local.cf</code>, add (or modify below settings):</p>
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<pre><code>use_bayes 1
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bayes_auto_learn 1
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bayes_auto_expire 1
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# Store bayesian data in MySQL
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bayes_store_module Mail::SpamAssassin::BayesStore::MySQL
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bayes_sql_dsn DBI:mysql:sa_bayes:127.0.0.1:3306
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# Store bayesian data in PostgreSQL
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#bayes_store_module Mail::SpamAssassin::BayesStore::PgSQL
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#bayes_sql_dsn DBI:Pg:sa_bayes:127.0.0.1:5432
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bayes_sql_username sa_user
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bayes_sql_password sa_user_password
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# Override the username used for storing data in the database.
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# This could be used to group users together to share bayesian filter data.
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# You can also use this config option to trick sa-learn to learn data as a
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# specific user.
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#
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# In iRedMail, SpamAssassin is called by Amavisd, so we must set it to be
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# same as Amavisd daemon user:
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# - on Linux, it's user `amavis`.
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# - on FreeBSD, it's user `vscan`.
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# - on OpenBSD, it's user `_vscan`.
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bayes_sql_override_username amavis
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</code></pre>
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<p>Make sure SpamAssassin will load bayes modules:</p>
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<pre><code># /etc/init.d/amavisd stop
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# amavisd -c /etc/amavisd/amavisd.conf debug 2>&1 | grep -i 'bayes'
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May 16 09:59:33 ... SpamAssassin loaded plugins: ..., Bayes, ...
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May 16 10:27:38 ... extra modules loaded after daemonizing/chrooting:
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Mail/SpamAssassin/BayesStore/MySQL.pm, Mail/SpamAssassin/BayesStore/SQL.pm, ...
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</code></pre>
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<p>Looks fine, now press <code>Ctrl-C</code> to terminate above command, and start Amavisd
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service again normally:</p>
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<pre><code># /etc/init.d/amavisd restart
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</code></pre>
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<p>It is required to initialize the database by learning a message. We use the
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sample spam email shipped in the RPM package provided by CentOS 6:</p>
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<pre><code># rpm -ql spamassassin | grep 'sample-spam'
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/usr/share/doc/spamassassin-3.3.1/sample-spam.txt
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# sa-learn --spam --username=amavis /usr/share/doc/spamassassin-3.3.1/sample-spam.txt
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Learned tokens from 1 message(s) (1 message(s) examined)
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</code></pre>
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<h2 id="check-number-of-learned-spamshams">Check number of learned spams/hams</h2>
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<p>Run SQL commands below to check how many spams/hams have been learnt (note:
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the numbers will be different on your server):</p>
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<pre><code>mysql> USE sa_bayes;
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mysql> SELECT username,spam_count,ham_count FROM bayes_vars;
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+----------+------------+-----------+
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| username | spam_count | ham_count |
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+----------+------------+-----------+
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| amavis | 3 | 38 |
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+----------+------------+-----------+
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</code></pre>
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<h2 id="auto-learn-spamham-with-dovecot-imap_sieve-plugin">Auto learn spam/ham with Dovecot imap_sieve plugin</h2>
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<ul>
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<li><a href="./dovecot.imapsieve.html">Auto learn spam/ham with Dovecot imap_sieve plugin</a></li>
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</ul>
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<h2 id="backup-your-sa_bayes-database">Backup your <code>sa_bayes</code> database</h2>
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<p>Don't forget to update <code>/var/vmail/backup/backup_mysql.sh</code> (or
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<code>backup_pgsql.sh</code> if you're running PostgreSQL backend) to backup this newly
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created <code>sa_bayes</code> database. For example:</p>
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<pre><code># Part of file `/var/vmail/backup/backup_mysql.sh`
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DATABASES='... sa_bayes'
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</code></pre>
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<h2 id="references">References</h2>
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<ul>
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<li><a href="http://wiki.apache.org/spamassassin/BayesInSpamAssassin">Bayes Introduction</a>. Please do read section <code>Things to remember</code>.</li>
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<li><a href="http://wiki.apache.org/spamassassin/BayesFaq">SpamAssassin Bayes Frequently Asked Questions</a></li>
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</ul><div class="footer">
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<p style="text-align: center; color: grey;">All documents are available in <a href="https://github.com/iredmail/docs/">GitHub repository</a>, and published under <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">Creative Commons</a> license. You can <a href="https://github.com/iredmail/docs/archive/master.zip">download the latest version</a> for offline reading. If you found something wrong, please do <a href="https://www.iredmail.org/contact.html">contact us</a> to fix it.</p>
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