sshield-uninstall

#!/bin/bash

if [[ $(whoami) == "root" ]];then
	:
else
	echo -e "\033[1;31m[-]\033[00m It needs root"
	exit 1
fi
clear
PWD=$(echo "$0" | sed -e "s/\/INSTALL//g")
function operation(){
	function loading(){
		while [ true ]
		do
			echo -ne "."
			sleep 2
		done
	}
	echo -ne $1
	loading&
	PID_loading=$!
	# if the installation or desinstallation have dialogs, it doesn't show it, but is executed
	if [[ $3 = 1 ]];then
		$2
	else
		DEBIAN_FRONTEND=nointeractive $2 > /dev/null 2>&1
	fi
	kill -19 $PID_loading > /dev/null 2>&1
	echo ""
}
confirm=0
while [ $confirm -lt 3 ]
do
	echo -ne "Uninstall sshield service? [y/n] ($(($confirm+1))º time): "
	read uninstall
	case $uninstall in
	"y" | "Y")
		:
	;;
	"n" | "N" | *)
		echo "Aborded"
		exit 1
	;;
	esac
	confirm=$((confirm+1))
done
systemctl disable sshield > /dev/null 2>&1
systemctl stop sshield > /dev/null 2>&1
operation "sshield -F" "sshield -F"
operation "deleting /bin/sshield" "shred -u /bin/sshield"
operation "deleting folder /etc/sshield/" "rm -rf /etc/sshield"
operation "deleting /lib/systemd/system/sshield.service" "shred -u /lib/systemd/system/sshield.service"
operation "deleting /etc/systemd/system/sshield" "shred -u /etc/systemd/system/sshield"
operation "deleting /etc/init.d/sshield" "shred -u /etc/init.d/sshield"
operation "deleting /etc/systemd/system/sshield.service" "rm /etc/systemd/system/sshield.service"
operation "deleting /usr/share/man/man1/sshield.1.gz" "shred -u /usr/share/man/man1/sshield.1.gz"
operation "deleting /usr/share/man/man1/sshield.help" "shred -u /usr/share/man/man1/sshield.help"
operation "deleting /var/cache/sshield.deny" "shred -u /var/cache/sshield.deny"
operation "deleting /var/log/sshield.log" "shred -u /var/log/sshield.log"
lineas=$(wc -l /usr/share/netfilter-persistent/plugins.d/15-ip4tables | grep -E -o "[0-9]{1,9}[[:space:]]")
linea=0
for line in $(seq 1 $lineas)
do
	if [[ $(awk "NR==$line" /usr/share/netfilter-persistent/plugins.d/15-ip4tables | grep "SSHIELD") ]];then
		linea=$line
	fi
done
inicio=$(($linea-1))
fin=$(($linea+4))
sed -i "$inicio,$fin{d}" /usr/share/netfilter-persistent/plugins.d/15-ip4tables > /dev/null 2>&1
systemctl daemon-reload > /dev/null 2>&1
systemctl stop sshield > /dev/null 2>&1
operation "deleting rc.d's files" "rm -rf /etc/rc?.d/S01sshield"

#
# The `listar` variable, contents the system's users. And with it, does a for loop.
# If the user has a directory in /home, it means that is a normal user, and not a service's user
#

listar=$(awk -F: '{ print $1}' /etc/passwd)
for usuario in $listar
do
        if [ -d /home/$usuario ];then

                #
                # If in the .bashrc file has the sshield's script added, else it, add it
                #

               	if [[ $(cat /home/$usuario/.bashrc | grep "ADDRESSES IP DENIED") ]];then
			ultima=$(wc -l /home/$usuario/.bashrc | grep -E -o "[0-9]{1,9}[[:space:]]")
			linea=0
			for i in $(seq 0 $ultima)
			do
				if [[ $(awk "NR==$i" /home/$usuario/.bashrc | grep "ADDRESSES IP DENIED") ]];then
					linea=$(echo "$i")
				fi
			done
			inicio=$(($linea-1))
			fin=$(($linea+8))
			sed -i "$inicio,$fin{d}" /home/$usuario/.bashrc > /dev/null 2>&1
		fi
	fi
done
archivos=("/root/.bashrc" "/etc/skel/.bashrc")
for archivo in ${archivos[*]}
do
	ultima=$(wc -l $archivo | grep -E -o "[0-9]{1,9}[[:space:]]")
        linea=0
        for i in $(seq 0 $ultima)
        do
	        if [[ $(awk "NR==$i" $archivo | grep "ADDRESSES IP DENIED") ]];then
	                linea=$(echo "$i")
                fi
        done
        inicio=$(($linea-1))
        fin=$(($linea+8))
	sed -i "$inicio,$fin{d}" $archivo > /dev/null 2>&1
done
echo -e "Finish. \033[1;32m●\033[0m Service uninstalled \033[1;32msuccessfully\033[0m."
operation "deleting sshield-uninstall" "shred -u /bin/sshield-uninstall"