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https://github.com/Ponce/slackbuilds
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162 lines
4.5 KiB
Text
162 lines
4.5 KiB
Text
README.SLACKWARE
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================
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Documentation
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-------------
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Please read the snort_manual.pdf file that should be included with this
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distribution for full documentation on the program as well as a guide to
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getting started.
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This package builds a very basic snort implementation useful for monitoring
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traffic as an IDS or packet logger and as a sort of improved tcpdump.
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For more information, check out snort's homepage at:
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http://www.snort.org/
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http://www.snort.org/docs/
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Source tarball and newer releases
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---------------------------------
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snort.org has no direct links to the source tarball, that's why it is also
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hosted on http://www.nielshorn.net/
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This is needed for sbopkg to work.
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If you want a newer version than the one available there, check:
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https://www.snort.org/snort-downloads
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Starting snort
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--------------
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An rc.snort file has been included for your convenience, but it needs to be
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added to your init script of choice to run on boot. You should modify the
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variables in /etc/rc.d/rc.snort to reflect the interface you want to monitor,
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or start it as:
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IFACE=xxxx /etc/rc.d/rc.snort start|stop|restart
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As an example, you can put this in your /etc/rc.d/rc.local script:
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if [ -x /etc/rc.d/rc.snort ]; then
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IFACE=eth1 /etc/rc.d/rc.snort start
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fi
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And this in your /etc/rc.d/rc.local_shutdown:
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if [ -x /etc/rc.d/rc.snort ]; then
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/etc/rc.d/rc.snort stop
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fi
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Installing / Updating Rules etc.
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--------------------------------
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In order for Snort to function properly, you need to provide rule files.
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You can either get a paid subscription (newest rules) at:
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https://www.snort.org/vrt/buy-a-subscription
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or register for free (only rules >30 days old) at:
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https://www.snort.org/signup
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Then download your rules from:
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https://www.snort.org/snort-rules
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The downloaded file contains the rules, signatures and updated configuration
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files. Be careful when updating these, as you will probably have customized
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a few settings in your snort.conf
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At the end of this file is a sample script that you can use as a base to
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automate unpacking of the tarball. It updates the rules, signatures and some
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configurations, but copies the new snort.conf as snort.conf.new, so that you
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can examine it later.
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This script is included only as an example and without any guarantee.
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** Use at your own risk! **
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Basically, you need to
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1) put the new rules/* into /etc/snort/rules/
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2) put the new preproc_rules/* into /etc/snort/preproc_rules/
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3) put the new doc/signatures/* into /usr/doc/snort-*/signatures/
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4) put the new etc/* into /etc/snort/ (except for snort.conf)
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After updating your files, restart snort with:
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# /etc/rc.d/rc.snort restart
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=============================================================================
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Sample script to update rules, signatures and configurations
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*** USE AT YOUR OWN RISK *** NO GUARANTEES ***
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=============================================================================
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#!/bin/bash
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# snortrules_update
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#
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# Written by Niels Horn <niels.horn@gmail.com>
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# Nothing guaranteed, use at your own risk!
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#
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# v1.00-2010/09/18 - first attempt
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#
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CWD=$(pwd)
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CONFDIR=/etc/snort
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# Exit on most errors
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set -e
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if [ "x$1" = "x" ]; then
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echo "Specify snortrules-snapshot file:"
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echo
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echo " $0 <snortrules-snapshot>"
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echo
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exit 1
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fi
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# Configuration files
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echo "*** Updating configuration files..."
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for cf in $( tar tf $1 | grep "etc/" ); do
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if [ ! "$cf" = "etc/" ]; then
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file=$(basename $cf)
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tar -xf $1 $cf -O > $CONFDIR/$file.new
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# check if it is "snort.conf"
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if [ ! "$file" = "snort.conf" ]; then
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# OK, it is something else, we can handle this
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if [ -r $CONFDIR/$file ]; then
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# we have a previous version
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if [ "$(cat $CONFDIR/$file | md5sum)" = "$(cat $CONFDIR/$file.new | md5sum)" ]; then
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# nothing new, dump previous version
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rm $CONFDIR/$file
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else
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# keep previous version
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mv -f $CONFDIR/$file $CONFDIR/$file.old
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fi
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fi
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# move new file over
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mv -f $CONFDIR/$file.new $CONFDIR/$file
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fi
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fi
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done
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# rules
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echo "*** Updating rules..."
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cd /etc/snort/rules
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tar --strip-components=1 --wildcards -xf $CWD/$1 rules/*
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cd - > /dev/null
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# preproc-rules
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echo "*** Updating preproc_rules..."
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cd /etc/snort/preproc_rules
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tar --strip-components=1 --wildcards -xf $CWD/$1 preproc_rules/*
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cd - > /dev/null
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# signatures
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echo "*** Updating signatures..."
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cd /usr/doc/snort-*/signatures
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tar --strip-components=2 --wildcards -xf $CWD/$1 doc/signatures/*
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cd - > /dev/null
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echo "All done."
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