ssh port knock script
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!/bin/bash | |
#Purpose: Open/close SSH port via port knock | |
#Author: Mohan Balasundaram | |
#Date: 24/04/2015 | |
NC="/bin/nc" | |
OPT="-z -w3" | |
PORT_OPEN_ORDER="10010 11020 12030" | |
PORT_CLOSE_ORDER="12030 11020 10010" | |
HOST="192.168.1.250" #jumpbox host | |
SSH_PORT="22" | |
if [ "$#" -ne 1 ]; then | |
echo "Usage: $0 open|close" | |
exit 2; | |
fi | |
if [[ $1 =~ ^([oO][pP][eE][nN])$ ]]; then | |
echo "Opening SSH Port" | |
for PORT in ${PORT_OPEN_ORDER}; do | |
${NC} ${OPT} ${HOST} ${PORT} | |
done | |
sleep 2; | |
echo "Checking SSH Port" | |
${NC} ${OPT} ${HOST} ${SSH_PORT} | |
elif [[ $1 =~ ^([cC][lL][oO][Ss][eE])$ ]]; then | |
echo "Closing SSH Port" | |
for PORT in ${PORT_CLOSE_ORDER}; do | |
${NC} ${OPT} ${HOST} ${PORT} | |
done | |
sleep 1; | |
echo "Checking SSH Port" | |
${NC} ${OPT} ${HOST} ${SSH_PORT} || echo "Connection to ${HOST} ${SSH_PORT} port [tcp/ssh] FAILED!" | |
else | |
echo "Invalid Input: $1" | |
echo "Usage: $0 open|close" | |
fi |
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