Created
March 10, 2018 08:59
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auto ip deny script
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#!/bin/bash | |
#检测时间 | |
SLEEP_TIME=10 | |
#禁用阈值 | |
NO_OF_CONNECTIONS=50 | |
#禁用时长 | |
BAN_PERIOD=300 | |
#白名单 | |
IGNORE_IP_LIST=/root/autodeny/allow_ip.txt | |
#排除的端口 | |
IGNORE_PORT= | |
write_log() | |
{ | |
logout="" | |
for((i=2;i<=$#;i++)); do | |
j=${!i} | |
logout="${logout} $j " | |
done | |
echo "[`date "+%Y-%m-%d %H:%M:%S"`][$1]: ${logout}" | tee -ai /root/autodeny/debug.log | |
} | |
banip() | |
{ | |
LOG_FILE=/root/autodeny/autodeny_$(date +%Y-%m-%d).log | |
if [[ ! -z $1 ]] | |
then | |
iptables -nvL | grep DROP | grep $1 >/dev/null | |
if [[ 0 -ne $? ]] | |
then | |
iptables -I INPUT -s $1 -j DROP && \ | |
write_log INFO "$1 Was Baned successfully." | |
return 0 | |
fi | |
fi | |
} | |
unbanip() | |
{ | |
LOG_FILE=/root/autodeny/autodeny_$(date +%Y-%m-%d).log | |
if [[ -z $1 ]] | |
then | |
UNBAN_SCRIPT=$(mktemp /tmp/unban.XXXXXXXX) | |
cat << EOF >$UNBAN_SCRIPT | |
#!/bin/sh | |
sleep $BAN_PERIOD | |
while read line | |
do | |
iptables -D INPUT -s \$line -j DROP | |
echo "[\`date "+%Y-%m-%d %H:%M:%S"\`][INFO]: \$line is Unbaned successfully." | tee -ai $LOG_FILE | |
done < $BANNED_IP_LIST | |
rm -f $BANNED_IP_LIST $BANNED_IP_MAIL $BAD_IP_LIST $UNBAN_SCRIPT | |
EOF | |
. $UNBAN_SCRIPT & | |
else | |
iptables -nvL | grep DROP | grep $1 >/dev/null | |
if [[ 0 -eq $? ]] | |
then | |
iptables -D INPUT -s $1 -j DROP | |
write_log INFO "$1 is Unbaned successfully." | |
else | |
write_log DEBUG "$1 is not found in iptables list, please check..." | |
fi | |
fi | |
} | |
check_ip() | |
{ | |
#check_ip if in the $IGNORE_IP_LIST | |
grep -q $CURR_LINE_IP $IGNORE_IP_LIST && return 0 | |
#check ip belongs to IP subnet | |
result=$(grep '/' $IGNORE_IP_LIST | awk -F'[./]' -v ip=$1 ' | |
{for (i=1;i<=int($NF/8);i++){a=a$i"."} | |
if (index(ip, a)==1){split( ip, A, ".");if (A[4]<2^(8-$NF%8)) print "hit"} | |
a=""}' ) | |
if [[ "$result" = "hit" ]] | |
then | |
return 0 | |
else | |
return 1 | |
fi | |
} | |
show_stats() | |
{ | |
netstat -ntu | \ | |
egrep -v "${IGNORE_PORT}LISTEN|127.0.0.1" | \ | |
awk -F"[ ]+|[:]" '{print $6}' | \ | |
sed -n '/[0-9]/p' | sort | uniq -c | sort -rn | |
} | |
cc_check() | |
{ | |
TMP_PREFIX='/tmp/autodeny' | |
TMP_FILE="mktemp $TMP_PREFIX.XXXXXXXX" | |
BANNED_IP_MAIL=$($TMP_FILE) | |
BANNED_IP_LIST=$($TMP_FILE) | |
LOG_FILE=/root/autodeny/autodeny_$(date +%Y-%m-%d).log | |
echo "Banned the following ip addresses on `date`" > $BANNED_IP_MAIL | |
echo >> $BANNED_IP_MAIL | |
BAD_IP_LIST=$($TMP_FILE) | |
show_stats | awk -v str=$NO_OF_CONNECTIONS '{if ($1>=str){print $0}}' > $BAD_IP_LIST | |
IP_BAN_NOW=0 | |
while read line; do | |
CURR_LINE_CONN=$(echo $line | cut -d" " -f1) | |
CURR_LINE_IP=$(echo $line | cut -d" " -f2) | |
check_ip $CURR_LINE_IP | |
if [ $? -eq 0 ]; then | |
continue | |
fi | |
banip $CURR_LINE_IP | |
if [ $? -eq 1 ]; then | |
continue | |
else | |
let IP_BAN_NOW+=1 | |
fi | |
CURR_LINE_IP_LOCATION=$(curl -s ip.cn/$CURR_LINE_IP) | |
write_log INFO "Banned $CURR_LINE_IP ($CURR_LINE_IP_LOCATION) with $CURR_LINE_CONN connections" >> $BANNED_IP_MAIL | |
echo $CURR_LINE_IP >> $BANNED_IP_LIST | |
#echo $CURR_LINE_IP >> $IGNORE_IP_LIST | |
done < $BAD_IP_LIST | |
if [[ $IP_BAN_NOW -ge 1 ]]; then | |
dt=$(date) | |
if [[ $BAN_PERIOD -gt 0 ]];then | |
unbanip | |
fi | |
else | |
rm -f $BANNED_IP_LIST $BANNED_IP_MAIL $BAD_IP_LIST | |
fi | |
} | |
while true | |
do | |
cc_check | |
sleep $SLEEP_TIME | |
done |
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