Block IP Abuse
From DreamHost
| The instructions provided in this article or section are considered advanced. You are expected to be knowledgeable in the UNIX shell. Server changes may cause this to break. Be prepared to troubleshoot this yourself if this happens. |
Contents |
IP Abuse Detection Script
This shell script checks the access and error logs generated by apache for a particular domain, looking for the IP addresses that have connected to your site the most. It checks for IP addresses that trigger a Concurrent Connection Limit Exceeded error, which is a good sign they are an automated bot of some kind, making over 20 requests to your site at the same time. This script also checks for Internal Recursion Errors which can have very negative effects on your speed and resources, and are basically internal looping problems generally caused by improperly configured Htaccess setups.
Once the script finishes scanning your logs for those events, it automatically generates .htaccess code that you may add to your sites root .htaccess file to block those IP addresses the script identified as abusive. The only IP addresses included in the generated .htaccess file are those that have no reverse dns.
Installation
- Log in to your account using SSH
- Save this code in your $HOME directory as ip-abuse-lookup.sh
- Run pico $HOME/ip-abuse-lookup.sh
- Copy the code to the screen by clicking the right-mouse-button
- Hold down the Ctrl button and then press x to save
- Run the command dos2unix -dv $HOME/ip-abuse-lookup.sh to fix line break issues
- Run the command chmod -v 744 $HOME/ip-abuse-lookup.sh to make executable
Running the Script
From your $HOME directory (cd $HOME), run ./ip-abuse-lookup.sh to execute the program.
Example Generated .htaccess
This script will also generate code that you can place in your .htaccess file to block specific abusers.
## IP-ABUSE-LOOKUP Order Allow,Deny Allow from All Deny from 6.132.177.129 27.67.117.178 6.135.166.102 8.93.225.133 Deny from 21.194.136.15 22.120.61.3 6.252.139.246 9.64.50.83 Deny from 8.123.144.98 21.249.83.87 29.85.238.28 25.214.237.62 Deny from 22.115.130.23 13.57.156.241 14.121.4.82 6.208.172.177
ip-abuse-lookup.sh
#!/bin/sh
# Version 0.2, 2008-04-20
# User-contributed script. Not sponsored by DreamHost.
# Script created 2008-01-16 by AskApache
### SHELL OPTIONS
set +o noclobber # allowed to clobber files
set +o noglob # globbing on
set +o xtrace # change to - to enable tracing
set +o verbose # change to - to enable verbose debugging
set -e # abort on first error
# directory where log files, reports, and generated .htaccess files will be saved
TMPDI="$HOME/ip_abuse"
function exitt(){
# RESET WINDOW TITLE
case $TERM in
xterm*|vt*|ansi|rxvt|gnome*) echo -e "\033]0;$USER@`hostname`: $HOME\007" ;;
esac
# RESET TERMINAL
tput sgr0
}
function ok_continue()
{ echo -en "\n\033[?25l\033[30;42m[ Press any key to continue ]\033[0m\n" ;read -n 1 ans;echo -en "\033[?25h"; }
function test_title()
{ echo -en "\n\n\033[0;32m\n>>>"; echo -e "\033[1;37m $1 \033[0m \n"; echo -e "\n\n[ ${1} ]\n" >> $REPORT; }
function error_abuse(){
clear; title
case "$2" in
connlimit|1*) test_title "CONCURRENT CONNECTION TEST"; future=2
echo -e "Shows IP's making more than 20 requests concurrently.\n\n"
cat $TMPDI/$YD/logs/e* |grep 'concurrent\ connection\ limit'|awk -F ']' '{print $3}' |
awk '{print $2}'|sort|uniq -c |sort -nr|sed 's/^ *//'|egrep "[0-9]{2}+\ " > $TMPDI/$YD/logs/out.txt ;;
access|2*) test_title "TOP 50 IP TEST"; future=3
echo -e "Displays the top 50 unique IP addresses that access your site."
echo -e "If they don't have a reverse DNS maybe they should be blocked.\n\n"
cat $TMPDI/$YD/logs/a* |awk '{print $1|"sort|uniq -dc|sort -nr"}' |egrep "[0-9]{3}+\ "|
awk '{print $1,$2}' > $TMPDI/$YD/logs/out.txt ;;
internal|3*) test_title "INTERNAL RECURSION TEST"; future="report"
echo -e "Shows the IP's that triggered an Internal Recursion Error,"
echo -e "meaning that their is a looping problem on your server.\n"
cat $TMPDI/$YD/logs/e* |grep 'LimitInternalRecursion'|awk -F ']' '{print $3}'|awk '{print $2}' |
sort|uniq -c|sort -nr|sed 's/^ *//'|egrep "[0-9]{2}+\ " > $TMPDI/$YD/logs/out.txt ;;
esac
echo -e "\033[?25l";t=0; h=0; cat $TMPDI/$YD/logs/out.txt |
while read a
do
if [ $t -lt 50 ];then
n=`echo "$a"|awk '{print $1}'`; ip=`echo "$a"|awk '{print $2}'`
host=`nice -n 19 host -qQ -s 4 "${ip}" 2>&1|tr '\n' '\t'|awk '{print $2}'`;
case "$host" in
does) echo -en "\033[0;33m"; echo -e "$ip" >> $REPORT
host=${host/does/!!!POSSIBLE-ABUSE!!!}; (( t++ )); (( h++ )); ips=" $ip$ips" ;;
not) echo -en "\033[0;33m"; echo -e "$ip" >> $REPORT
host=${host/not/!!!POSSIBLE-ABUSE!!!}; (( t++ )); (( h++ )); ips=" $ip$ips" ;;
PTR) echo -en "\033[0;33m"; echo -e "$ip" >> $REPORT
host=${host/PTR/!!!POSSIBLE-ABUSE!!!}; (( t++ )); (( h++ )); ips=" $ip$ips" ;;
.) echo -en "\033[0;33m"; echo -e "$ip" >> $REPORT
host=${host/\./!!!POSSIBLE-ABUSE!!!}; (( t++ )); (( h++ )); ips=" $ip$ips" ;;
esac
echo -en " ${n}\t${ip}\t${host}\033[0m\n"
if [ $h -gt 3 ]; then
echo -e "Deny from$ips" >> $TMPDI/$YD/.htaccess; h=0; ips=" ";
fi
fi
done
[ $h -gt 0 ] && echo -e "Deny from$ips" >> $TMPDI/$YD/.htaccess
ok_continue; exec sh $0 "$1" "$future"
}
function menu(){
PS3="`echo -e '\n\033[0;36m'`Please Select a Domain To Test: `echo -e '\033[0m'`"; echo -ne "\033[0m"
select v
do
YD="$v"
mkdir -p -m 0755 $TMPDI/$YD/reports
mkdir -p -m 0755 $TMPDI/$YD/logs
echo "" > $TMPDI/$YD/logs/out.txt
echo "" > $TMPDI/$YD/.htaccess
echo -e "## IP-ABUSE-LOOKUP\nOrder Allow,Deny\nAllow from All" > $TMPDI/$YD/.htaccess
ELOG="$TMPDI/$YD/logs/error.log"
ALOG="$TMPDI/$YD/logs/access.log"
REPORT=$(echo -en "$TMPDI/$YD/reports/`date +%mx%dx%y`.txt");
echo "" > $REPORT; echo -e "GENERATED REPORT FOR $YD \n`date`\n" >> $REPORT
clear; title; cd ~/logs/$YD/http
if [ ! -f $ELOG ]; then
test_title "Creating Error log"
`nice -n 19 gunzip -dc e*.gz | split -b 1m -a 4 -d - $TMPDI/$YD/logs/e.`; wait
cp error.log $TMPDI/$YD/logs; echo -e "\033[0;31m [ DONE ]\n\n"
fi
if [ ! -f $ALOG ]; then
test_title "Creating access log"
`nice -n 19 gunzip -dc a*.gz | split -b 5m -a 4 -d - $TMPDI/$YD/logs/a.`; wait
cp access.log $TMPDI/$YD/logs; echo -e "\033[0;31m [ DONE ]\n\n"
fi
cd $HOME; exec sh $0 "$YD" "1"
done
}
function show_report(){
clear; title;
PS3="`echo -e '\n\033[0;36m'`Please select a course of action: `echo -e '\033[0m'`"; echo -ne "\033[0m"
select v in "View Report" "View .htaccess" "Quit"
do
case "$v" in
*Report) clear; title; test_title "VIEWING $REPORT"; cat $REPORT ;;
*htaccess) clear; title; test_title "VIEWING $TMPDI/$YD/.htaccess"; cat $TMPDI/$YD/.htaccess ;;
Quit) break;;
esac
done
exit 0
}
function title(){
# pretty sweet!
echo -e "\033[1;30m __________________________________________________________________________ "
echo -e "|\033[1;32m ___ __ __ __ \033[1;30m|"
echo -e "|\033[1;32m / _ \_______ ___ ___ _ / // /__ ___ / /_ \033[1;30m|"
echo -e '|\033[1;32m / // / __/ -_) _ `/ ` \/ _ / _ \(_-</ __/ \033[1;30m|'
echo -e "|\033[0;32m /____/_/ \__/\_,_/_/_/_/_//_/\___/___/\__/ \033[1;30m|"
echo -e "| |"
echo -e "| \033[1;37mDREAMHOST IP ABUSE DETECTION SCRIPT VERSION 0.2\033[1;30m |";
echo -e "\033[1;30m __________________________________________________________________________ \033[0m\n\n"
}
# catch non-kill exit to reset term / ncurses
trap exitt EXIT
# SET WINDOW TITLE IF CLIENT CAPABLE
case ${TERM:-dummy} in
xterm*|vt*|ansi|rxvt|gnome*) echo -e "\033]0;DREAMHOST IP ABUSE DETECTION SCRIPT\007" ;;
esac
# MAKE NICE
renice 19 -p $$ &>/dev/null
if [ $# -lt 1 ]; then
clear; title; [ -d $TMPDI ] || mkdir -m 755 $TMPDI
cd ~/logs/; DOMAINS=( `command ls ~/logs/|grep -xv resources` ); cd $OLDPWD
menu ${DOMAINS[@]}
else
YD="${1}"
mkdir -p -m 0755 $TMPDI/$YD/reports; mkdir -p -m 0755 $TMPDI/$YD/logs
touch $TMPDI/$YD/logs/out.txt;
ELOG="$TMPDI/$YD/logs/error.log"
ALOG="$TMPDI/$YD/logs/access.log"
REPORT=$(echo -en "$TMPDI/$YD/reports/`date +%mx%dx%y`.txt");
if [ "$2" == "report" ]; then
show_report "$1" "$2"
else
error_abuse "$1" "$2"
fi
fi
exit 0
