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https://github.com/Ponce/slackbuilds
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124 lines
3.9 KiB
Text
124 lines
3.9 KiB
Text
README.SLACKWARE
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================
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Documentation
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-------------
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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. More
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information can be found at the following URLs:
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https://www.snort.org/ (homepage)
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https://www.snort.org/#documents (documentation links)
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http://manual.snort.org/ (user manual)
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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 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 put 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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IFACE=xxxx /etc/rc.d/rc.snort stop
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fi
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Installing and Updating Rules
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-----------------------------
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In order for Snort to function properly, you need to download rules, and
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you need to update the rules regularly.
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You can get a paid subscription for the latest rules at
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https://www.snort.org/products
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or you can register for free to download rules >30 days old at
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https://www.snort.org/users/sign_up
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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 .tar.gz file contains rules and updated configuration files.
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Be careful merging them, as you will probably have customized a few settings
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in your snort.conf. 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 etc/* into /etc/snort/ (except for snort.conf)
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4) review any changes to snort.conf and merge them into /etc/snort.conf
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5) restart snort:
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# IFACE=xxxx /etc/rc.d/rc.snort restart
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Below is a sample script that you can use to do steps 1-3 automatically.
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The script installs the new configuration as snort.conf.new, so that you can
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review it.
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#!/bin/bash
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#=============================================================================
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# Sample script to update snort rules, signatures and configurations
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# *** USE AT YOUR OWN RISK *** NO GUARANTEES ***
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#=============================================================================
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# Written by Niels Horn
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# Maintained by David Spencer <baildon.research@googlemail.com>
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# v2 2015-02-22 dbs
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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 [ -z "$1" ]; then
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echo "Please specify snortrules-snapshot file:"
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echo " $0 snortrules-snapshot-nnnn.tar.gz"
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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 -o -xf "$1" "$cf" -O > "$CONFDIR/$file.new"
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# check if it is "snort.conf"
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if [ "$file" = "snort.conf" ]; then
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LIBDIRSUFFIX=""
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[ "$(uname -m)" = 'x86_64' ] && LIBDIRSUFFIX="64"
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sed -i -e "s#/usr/local/lib/#/usr/lib$LIBDIRSUFFIX/#g" "$CONFDIR/snort.conf.new"
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else
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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 [ "$(md5sum <"$CONFDIR/$file")" = "$(md5sum <"$CONFDIR/$file.new")" ]; 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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tar -o --strip-components=1 --directory=/etc/snort/rules --wildcards -xf "$1" 'rules/*'
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# preproc-rules
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echo "*** Updating preproc_rules..."
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tar -o --strip-components=1 --directory=/etc/snort/preproc_rules --wildcards -xf "$1" 'preproc_rules/*'
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echo "All done."
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