Shell script 搭配 ipfw table 阻擋入侵 sshd 攻擊 authlog_banip.sh 修正版

1. 目前已將之前只有阻擋 30 天改為先阻擋 30 天, 若是 30 ~ 90 天前仍有多筆紀錄就再加鎖一段時間直到符合 Good Boy 條件.

2. 程式碼如下:
For SSHD

#!/usr/local/bin/bash

LOGFILE="/PATH/TO/auth.log"
PROCFOLDER="/PATH/TO/auth_sshd_banip"
TOTALBANLOGFILE="/PATH/TO/auth_sshd_banip.log"
TOTALBANLOGFILESORTED="/PATH/TO/auth_sshd_banip_sorted.log"
TOTALBANLOGFILEFROMPROCFOLDERSORTED="/PATH/TO/auth_sshd_banip_from_procfolder_sorted.log"
TOTALRESCUELIST="/PATH/TO/auth_sshd_rescue_list.log"
CRONJOBDATE="crontjobdate.log"
TODAYLOGFM=`date +"%b %e"`
DefaultCheckPeriod="30"
MVFilePeriod="90"

TODAY=`date +"%Y%m%d"`
OLDDAY=`date -v-${DefaultCheckPeriod}d +"%Y%m%d"`
OLDYEAR=`date -v-${DefaultCheckPeriod}d +"%Y"`

fwcmd="/sbin/ipfw"

echo "Prepare folder and file"
mkdir -p $PROCFOLDER
touch $TOTALBANLOGFILE
touch $TOTALRESCUELIST
touch $PROCFOLDER/$CRONJOBDATE
touch $TOTALBANLOGFILEFROMPROCFOLDERSORTED

SSHDErrorCounter1=`cat $LOGFILE | grep "$TODAYLOGFM" | grep sshd | grep "Invalid user" | awk '{ print $10 }' | wc -l`
SSHDErrorCounter2=`cat $LOGFILE | grep "$TODAYLOGFM" | grep sshd | grep "Did not receive identification string from" | awk '{ print $12 }' | wc -l`
SSHDErrorCounter3=`cat $LOGFILE | grep "$TODAYLOGFM" | grep sshd | grep "not allowed because none of user" | awk '{ print $9 }' | wc -l`

if [ $SSHDErrorCounter1 -ne 0 ]||[ $SSHDErrorCounter2 -ne 0 ]||[ $SSHDErrorCounter3 -ne 0 ]||[ -f $PROCFOLDER/sshdpre-$TODAY.log ]; then
        echo "Write pre-process file"
        touch $PROCFOLDER/sshdpre-$TODAY.log
        cat $LOGFILE | grep "$TODAYLOGFM" | grep sshd | grep "Invalid user" | awk '{ print $10 }' | sort -n | sort -u >> $PROCFOLDER/sshdpre-$TODAY.log
        cat $LOGFILE | grep "$TODAYLOGFM" | grep sshd | grep "Did not receive identification string from" | awk '{ print $12 }' | sort -n | sort -u >> $PROCFOLDER/sshdpre-$TODAY.log
        cat $LOGFILE | grep "$TODAYLOGFM" | grep sshd | grep "not allowed because none of user" | awk '{ print $9 }' | sort -n | sort -u >> $PROCFOLDER/sshdpre-$TODAY.log
        cp -a $PROCFOLDER/sshdpre-$TODAY.log /tmp
        cat /tmp/sshdpre-$TODAY.log | sort -n | sort -u > $PROCFOLDER/sshdpre-$TODAY.log
        rm -f /tmp/sshdpre-$TODAY.log

        echo "Collect new ban IP"
        for ip in $(awk '{ print }' $PROCFOLDER/sshdpre-$TODAY.log)
        do
                if [ `grep $ip $PROCFOLDER/sshd-*.log | wc -l` -gt 0 ]; then
                        echo $ip "Old bad boy"
                else
                        echo $ip
                        
                        touch $PROCFOLDER/sshd-$TODAY.log
                        echo $ip >> $PROCFOLDER/sshd-$TODAY.log
                        echo $ip >> $TOTALBANLOGFILE
                fi
        done

        echo "Ban bad boy"
        if [ -f $PROCFOLDER/sshd-$TODAY.log ]; then
                for banip in $(awk '{ print }' $PROCFOLDER/sshd-$TODAY.log)
                do
                        #Ban IP
                        echo "Check $banip"

                        if [ `ipfw table 3 list | grep $banip | wc -l` -gt 0 ]; then
                                echo "Had ban bad boy($banip)."
                        else
                                echo "Ban bad boy($banip) now."
                                ${fwcmd} table 3 add $banip/32
                                ${fwcmd} table 4 add $banip/32
                        fi
                done
        else
                echo "No bad boy"
        fi

        echo "Rescue good boy"
        if [ -f $PROCFOLDER/sshd-$OLDDAY.log ]; then
                for rescueip in $(awk '{ print }' $PROCFOLDER/sshd-$OLDDAY.log)
                do
                        #Rescue IP
                        echo "Check $rescueip"
                        
                        BadBoyDCPCounter=`find $PROCFOLDER -d 1 -ctime +${DefaultCheckPeriod} -type f -name 'sshd*.log' -exec grep $rescueip {} \; | wc -l`
                        BadBoyMVFCounter=`find $PROCFOLDER -d 1 -ctime +${MVFilePeriod} -type f -name 'sshd*.log' -exec grep $rescueip {} \; | wc -l`

                        if [ $BadBoyDCPCounter -lt 1 ]; then
                                if [ $BadBoyMVFCounter -le 2 ]; then
                                        echo "Rescue $rescueip"
                                        ${fwcmd} table 3 delete $rescueip/32
                                        ${fwcmd} table 4 delete $rescueip/32
                                
                                        grep -v $rescueip $TOTALBANLOGFILE > /tmp/stillbanip-$TODAY
                                        cp -f /tmp/stillbanip-$TODAY $TOTALBANLOGFILE
                                        rm -f /tmp/stillbanip-$TODAY
                                        echo $rescueip >> $TOTALRESCUELIST
                                        echo "Rescued"
                                else
                                        echo "Not bad boy in ${DefaultCheckPeriod} days, but had bad boy record in ${MVFilePeriod} days."
                                fi
                        else
                                echo "Still bad boy in ${DefaultCheckPeriod} days"
                        fi
                done
                
                #Move to old folder
                echo "Move old file to storage folder"
                mkdir -p $PROCFOLDER/$OLDYEAR
                mv $PROCFOLDER/sshd*-$OLDDAY.log $PROCFOLDER/$OLDYEAR
        else
                echo "No candidate file"
        fi

        cat $TOTALBANLOGFILE | sort -n | sort -u > $TOTALBANLOGFILESORTED
        
else
        echo "No bad boy"
fi

### Move old files to backup folder
find $PROCFOLDER -d 1 -ctime +${MVFilePeriod} -type f -name 'sshd*.log' -exec mv {} $PROCFOLDER/$OLDYEAR \;
cat $PROCFOLDER/sshd-*.log | sort -n | sort -u > $TOTALBANLOGFILEFROMPROCFOLDERSORTED

### Additional rescure goodboy
for rescueip in `diff $TOTALBANLOGFILEFROMPROCFOLDERSORTED $TOTALBANLOGFILESORTED | grep -v a | awk '{ print $2 }' | sort -r -n`
do
        echo "Additional rescure goodboy from diff $TOTALBANLOGFILEFROMPROCFOLDERSORTED and $TOTALBANLOGFILESORTED"     
        echo "Rescue $rescueip"
        ${fwcmd} table 3 delete $rescueip/32
        ${fwcmd} table 4 delete $rescueip/32

        grep -v $rescueip $TOTALBANLOGFILE > /tmp/stillbanip-$TODAY
        cp -f /tmp/stillbanip-$TODAY $TOTALBANLOGFILE
        rm -f /tmp/stillbanip-$TODAY
        echo $rescueip >> $TOTALRESCUELIST
        echo "Rescued"
done

cat $TOTALBANLOGFILE | sort -n | sort -u > $TOTALBANLOGFILESORTED

echo $TODAY > $PROCFOLDER/$CRONJOBDATE

### For backup and administration
/PATH/TO/BACKUP_SCRIPT

For MAIL

#!/usr/local/bin/bash

PATH=$PATH

LOGFILE="/PATH/TO/maillog"
DOVECOTERRORLOGFILE="/PATH/TO/dovecot/error.log"
DOVECOTINFOLOGFILE="/PATH/TO/dovecot/info.log"
PROCFOLDER="/PATH/TO/mail_banip"
DAILYLOG="mail_banip"`date +"%Y%m%d"`".log"
TMPFILE="/tmp/mailban-"`date +"%s"`
TODAYLOGFM=`date +"%b %e"`
fwcmd="/sbin/ipfw"

DefaultCheckPeriod="30"
MVFilePeriod="30"

OLDDAILYLOG="mail_banip"`date -v-${DefaultCheckPeriod}d +"%Y%m%d"`".log"
OLDYEAR=`date -v-${MVFilePeriod}d +"%Y"`

mkdir -p $PROCFOLDER

MAILErrorString1="NOQUEUE: reject"
MAILErrorCounter1=`cat $LOGFILE | grep "$TODAYLOGFM" | grep postfix | grep "$MAILErrorString1" | wc -l`
MAILErrorString2="auth-worker(default): Error: pam"
MAILErrorCounter2=`cat $DOVECOTERRORLOGFILE | grep "$TODAYLOGFM" | grep "$MAILErrorString2" | awk 'BEGIN { FS = ": " } ; { print $3 }' | awk 'BEGIN { FS = "," } ; { print $2 }' | sort -n | sort -u | sed -Ee 's/)//' | wc -l`
MAILErrorString3="pop3-login: Info: Aborted login (auth failed"
MAILErrorCounter3=`cat $DOVECOTINFOLOGFILE | grep "$TODAYLOGFM" | grep "$MAILErrorString3" | awk 'BEGIN { FS = ", " } ; { print $4 }' | awk 'BEGIN { FS = "=" } ; { print $2 }' | sort -n | sort -u | wc -l`

if [ $MAILErrorCounter1 -ne 0 ]||[ $MAILErrorCounter2 -ne 0 ]||[ $MAILErrorCounter3 -ne 0 ]||[ -f $PROCFOLDER/$DAILYLOG ]; then
        if [ ! -f $PROCFOLDER/$DAILYLOG ]; then
                touch $PROCFOLDER/$DAILYLOG
        fi

        echo "Collect Bad boy"
        touch $TMPFILE
        cat $LOGFILE | grep "$TODAYLOGFM" | grep postfix | grep "NOQUEUE: reject" | awk 'BEGIN { FS = "[" } ; { print $3 }' | awk 'BEGIN { FS = "]" } ; { print $1 }' | sort -n | sort -u >> $PROCFOLDER/$DAILYLOG
        cat $DOVECOTERRORLOGFILE | grep "$TODAYLOGFM" | grep "$MAILErrorString2" | awk 'BEGIN { FS = ": " } ; { print $3 }' | awk 'BEGIN { FS = "," } ; { print $2 }' | sort -n | sort -u | sed -Ee 's/)//' >> $PROCFOLDER/$DAILYLOG
        cat $DOVECOTINFOLOGFILE | grep "$TODAYLOGFM" | grep "$MAILErrorString3" | awk 'BEGIN { FS = ", " } ; { print $4 }' | awk 'BEGIN { FS = "=" } ; { print $2 }' | sort -n | sort -u >> $PROCFOLDER/$DAILYLOG
        cat $PROCFOLDER/$DAILYLOG | sort -n | sort -u | grep -v "192.168.58" | grep -v "192.168.68" | grep -v "192.168.8" | grep -v "60.248.16.64" | grep -v "60.248.16.65" | grep -v "60.248.16.66" > $TMPFILE
        cp -f $TMPFILE $PROCFOLDER/$DAILYLOG

        echo "Ban Bad Boy"
        for banip in $(awk '{ print }' $PROCFOLDER/$DAILYLOG)
        do
                if [ `ipfw table 3 list | grep $banip | wc -l` -gt 0 ]; then
                        echo "Had ban bad boy($banip)."
                else
                        echo "Ban bad boy($banip) now."
                        ${fwcmd} table 3 add $banip/32
                        ${fwcmd} table 4 add $banip/32
                fi
        done
        
        rm -f $TMPFILE
fi

if [ -f $PROCFOLDER/$OLDDAILYLOG ]; then
        for rescueip in $(awk '{ print }' $PROCFOLDER/$OLDDAILYLOG)
        do
                echo "Rescue $rescueip"
                ${fwcmd} table 3 delete $rescueip/32
                ${fwcmd} table 4 delete $rescueip/32
        done
else
        echo "No candidate file"
fi

#Move to old folder
echo "Move old file to storage folder"
mkdir -p $PROCFOLDER/$OLDYEAR
find $PROCFOLDER -d 1 -ctime +${MVFilePeriod} -type f -name 'mail_banip*.log' -exec mv {} $PROCFOLDER/$OLDYEAR \;

For HTTPD

#!/usr/local/bin/bash

PATH=$PATH

LOGFILE="/PATH/TO/httpd-access.log"
PROCFOLDER="/PATH/TO/httpd_banip"
DAILYLOG="httpd_banip"`date +"%Y%m%d"`".log"
TMPFILE="/tmp/httpdban-"`date +"%s"`
TODAYLOGFM=`date +"%d/%b/%Y"`
fwcmd="/sbin/ipfw"

DefaultCheckPeriod="30"
MVFilePeriod="30"

OLDDAILYLOG="httpd_banip"`date -v-${DefaultCheckPeriod}d +"%Y%m%d"`".log"
OLDYEAR=`date -v-${MVFilePeriod}d +"%Y"`

mkdir -p $PROCFOLDER

ErrorString1="xmlrpc.php"
ErrorCounter1=`cat $LOGFILE | grep "$TODAYLOGFM" | grep "$ErrorString1" | grep 404 | awk 'BEGIN { FS = " " } ; { print $1 }' | grep -v "192.168.58" | grep -v "192.168.68" | grep -v "192.168.8" | grep -v "60.248.16.64" | grep -v "60.248.16.65" | grep -v "60.248.16.66" | wc -l`

if [ $ErrorCounter1 -ne 0 ]||[ -f $PROCFOLDER/$DAILYLOG ]; then
        if [ ! -f $PROCFOLDER/$DAILYLOG ]; then
                touch $PROCFOLDER/$DAILYLOG
        fi

        echo "Collect Bad boy"
        touch $TMPFILE
        cat $LOGFILE | grep "$TODAYLOGFM" | grep "$ErrorString1" | grep 404 | awk 'BEGIN { FS = " " } ; { print $1 }' | sort -n | sort -u >> $PROCFOLDER/$DAILYLOG
        cat $PROCFOLDER/$DAILYLOG | sort -n | sort -u | grep -v "192.168.58" | grep -v "192.168.68" | grep -v "192.168.8" | grep -v "60.248.16.64" | grep -v "60.248.16.65" | grep -v "60.248.16.66" > $TMPFILE
        cp -f $TMPFILE $PROCFOLDER/$DAILYLOG
        
        echo "Ban Bad Boy"
        for banip in $(awk '{ print }' $PROCFOLDER/$DAILYLOG)
        do
                if [ `ipfw table 3 list | grep $banip | wc -l` -gt 0 ]; then
                        echo "Had ban bad boy($banip)."
                else
                        echo "Ban bad boy($banip) now."
                        ${fwcmd} table 3 add $banip/32
                        ${fwcmd} table 4 add $banip/32
                fi
        done
        
        rm -f $TMPFILE
fi

if [ -f $PROCFOLDER/$OLDDAILYLOG ]; then
        for rescueip in $(awk '{ print }' $PROCFOLDER/$OLDDAILYLOG)
        do
                echo "Rescue $rescueip"
                ${fwcmd} table 3 delete $rescueip/32
                ${fwcmd} table 4 delete $rescueip/32
        done
else
        echo "No candidate file"
fi

#Move to old folder
echo "Move old file to storage folder"
mkdir -p $PROCFOLDER/$OLDYEAR
find $PROCFOLDER -d 1 -ctime +${MVFilePeriod} -type f -name 'httpd_banip*.log' -exec mv {} $PROCFOLDER/$OLDYEAR \;

3. 以上程式碼為自由軟體, 請自行取用. 強烈建議服用前先看清楚再服用, 避免發生意外.