●パケットスニファモード（パケットロガーモード）

●NIDSモード（ネットワーク型侵入検知システムモード）

★Snortの入手・ルールファイルの入手

Snortのrpmパッケージダウンロード画面

★Snortのインストール・ルールファイルのインストール

★設定ファイルの編集

▼HOME_NET記述

▼EXTERNAL_NET記述

▼DNS/SMTP/HTTP/SQL/TELNET/SNMP記述

▼ルールファイルの有効化

★さあ動かしてみましょう！

★自動起動スクリプトの設定

#!/bin/sh
# $Id$
#
# snortd         Start/Stop the snort IDS daemon.
#
# chkconfig: 2345 40 60
# description:  snort is a lightweight network intrusion detection tool that \
#                currently detects more than 1100 host and network \
#                vulnerabilities, portscans, backdoors, and more.
#

# Source function library.
. /etc/rc.d/init.d/functions

# Source the local configuration file
. /etc/sysconfig/snort

# Convert the /etc/sysconfig/snort settings to something snort can
# use on the startup line.
if [ "$ALERTMODE"X = "X" ]; then
   ALERTMODE=""
else
   ALERTMODE="-A $ALERTMODE"
fi

if [ "$USER"X = "X" ]; then
   USER="snort"
fi

if [ "$GROUP"X = "X" ]; then
   GROUP="snort"
fi

if [ "$BINARY_LOG"X = "1X" ]; then
   BINARY_LOG="-b"
else
   BINARY_LOG=""
fi

if [ "$CONF"X = "X" ]; then
   CONF="-c /etc/snort/snort.conf"
else
   CONF="-c $CONF"
fi

if [ "$INTERFACE"X = "X" ]; then
   INTERFACE="-i eth0"
else 
   INTERFACE="-i $INTERFACE"
fi

if [ "$DUMP_APP"X = "1X" ]; then
   DUMP_APP="-d"
else
   DUMP_APP=""
fi 

if [ "$NO_PACKET_LOG"X = "1X" ]; then
   NO_PACKET_LOG="-N"
else
   NO_PACKET_LOG=""
fi        

if [ "$PRINT_INTERFACE"X = "1X" ]; then
   PRINT_INTERFACE="-I"
else
   PRINT_INTERFACE=""
fi

if [ "$PASS_FIRST"X = "1X" ]; then
   PASS_FIRST="-o"
else
   PASS_FIRST=""
fi

if [ "$LOGDIR"X = "X" ]; then
   LOGDIR=/var/log/snort
fi

# These are used by the 'stats' option
if [ "$SYSLOG"X = "X" ]; then
   SYSLOG=/var/log/messages
fi

if [ "$SECS"X = "X" ]; then
   SECS=5
fi

if [ ! "$BPFFILE"X = "X" ]; then
   BPFFILE="-F $BPFFILE"
fi

######################################
# Now to the real heart of the matter:

# See how we were called.
case "$1" in
  start)
        echo -n "Starting snort: "
        cd $LOGDIR
        if [ "$INTERFACE" = "-i ALL" ]; then
           for i in `cat /proc/net/dev|grep eth|awk -F ":" '{ print $1; }'`
           do
                mkdir -p "$LOGDIR/$i"
                chown -R $USER:$GROUP $LOGDIR
                daemon /usr/sbin/snort $ALERTMODE $BINARY_LOG $NO_PACKET_LOG $DUMP_APP -D $PRINT_INTERFACE -i $i -u $USER -g $GROUP $CONF -l $LOGDIR/$i $PASS_FIRST $BPFFILE $BPF
           done
        else
           # check if more than one interface is given
           if [ `echo $INTERFACE|wc -w` -gt 2 ]; then
              for i in `echo $INTERFACE | sed s/"-i "//`
                do
                  mkdir -p "$LOGDIR/$i"
                  chown -R $USER:$GROUP $LOGDIR
                  daemon /usr/sbin/snort $ALERTMODE $BINARY_LOG $NO_PACKET_LOG $DUMP_APP -D $PRINT_INTERFACE -i $i -u $USER -g $GROUP $CONF -l $LOGDIR/$i $PASS_FIRST $BPFFILE $BPF
             done
           else
              # Run with a single interface (default)
              daemon /usr/sbin/snort $ALERTMODE $BINARY_LOG $NO_PACKET_LOG $DUMP_APP -D $PRINT_INTERFACE $INTERFACE -u $USER -g $GROUP $CONF -l $LOGDIR $PASS_FIRST $BPFFILE $BPF
           fi
        fi
        touch /var/lock/subsys/snort
        echo
        ;;
  stop)
        echo -n "Stopping snort: "
        killproc snort
        rm -f /var/lock/subsys/snort
        echo 
        ;;
  reload)
        echo "Sorry, not implemented yet"
        ;;
  restart)
        $0 stop
        $0 start
        ;;
  condrestart)
        [ -e /var/lock/subsys/snort ] && $0 restart
        ;;
  status)
        status snort
        ;;
  stats)
        TC=125                          # Trailing context to grep
        SNORTNAME='snort'               # Process name to look for

        if [ ! -x "/sbin/pidof" ]; then
           echo "/sbin/pidof not present, sorry, I cannot go on like this!"
           exit 1
        fi

        #Grab Snort's PID
        PID=`pidof -o $$ -o $PPID -o %PPID -x ${SNORTNAME}`

        if [ ! -n "$PID" ]; then        # if we got no PID then:
           echo "No PID found: ${SNORTNAME} must not running."
           exit 2
        fi

        echo ""
        echo "*******"
        echo "WARNING:  This feature is EXPERIMENTAL - please report errors!"
        echo "*******"
        echo ""
        echo "You can also run: $0 stats [long | opt]"
        echo ""
        echo "Dumping ${SNORTNAME}'s ($PID) statistics"
        echo "please wait..."

        # Get the date and tell Snort to dump stats as close together in
        # time as possible--not 100%, but it seems to work.
        startdate=`date '+%b %e %H:%M:%S'`

        # This causes the stats to be dumped to syslog
        kill -USR1 $PID

        # Sleep for $SECS secs to give syslog a chance to catch up
        # May need to be adjusted for slow/busy systems
        sleep $SECS

        if [ "$2" = "long" ]; then              # Long format
            egrep -B 3 -A $TC "^$startdate .* snort.*: ={79}" $SYSLOG | \
                grep snort.*:
        elif [ "$2" = "opt" ]; then             # OPTimize format
           # Just show stuff useful for optimizing Snort
            egrep -B 3 -A $TC "^$startdate .* snort.*: ={79}" $SYSLOG | \
                egrep "snort.*: Snort analyzed |snort.*: dropping|emory .aults:"
        else                                    # Default format
            egrep -B 3 -A $TC "^$startdate .* snort.*: ={79}" $SYSLOG | \
                grep snort.*: | cut -d: -f4-
        fi
        ;;
  *)
        echo "Usage: $0 {start|stop|reload|restart|condrestart|status|stats (long|opt)}"
        exit 2
esac

exit 0

★Snortログのお助けツール

▼SnortSnarf

▼Oinkmaster

▼Swatch

★Snortのアラートをデータベース出力にする

★acidでログを視覚化する