Subversion Repositories ALCASAR

#!/bin/bash

# alcasar-ssh.sh
# by Alexandre Vezin

# enable/disable SSH on external NIC (EXTIF). Set the listen port on EXTIF
# activation/désactivation de SSH sur la carte réseau externe (EXTIF). Définit le port d'écoute sur EXTIF

SED="/bin/sed -i"
CAT="/bin/cat"
GREP="/bin/grep"
ALCASAR_CONF="/usr/local/etc/alcasar.conf"
SSH_CONF="/etc/ssh/sshd_config"

usage="Usage: alcasar-ssh.sh {--off | -off} | {--on | -on} [-p port]"

nb_args=$#
args=$1
echo "Checking args" >> '/tmp/alcasar_sms_tmp.log'
if [ $nb_args -eq 0 ]
then
        echo "No args" >> '/tmp/alcasar_sms_tmp.log'
        echo "$usage"
        exit 1
fi

while getopts ":p:" portarg; do
    case "${portarg}" in
        p)
                        echo "Port check" >> '/tmp/alcasar_sms_tmp.log'
            SSH_PORT=${OPTARG}
                        echo "Port : $SSH_PORT" >> /tmp/alcasar_sms_tmp.log
                        if [ $SSH_PORT -lt 0 ] || [ $SSH_PORT -gt 65535 ]
                                then
                                echo "Invalid port" >> /tmp/alcasar_sms_tmp.log
                                echo "The port $SSH_PORT is invalid"
                                exit 1
                        fi
            ;;
    esac
done

case $args in
        -\? | -h* | --h*)
                echo "$usage"
                exit 0
                ;;
        --off | -off)
                echo "off" >> '/tmp/alcasar_sms_tmp.log'
                # Editing Alcasar configuration - Deleting the port
        $SED "s/^SSH_WAN=.*/SSH_WAN=/g" $ALCASAR_CONF
                # Editing SSH configuration - Deleting any port other than 22
                $SED "/^.*Port\s[0-9]*/{/\s22$/!d}" $SSH_CONF
                # Applying iptables
                /usr/local/bin/alcasar-iptables.sh
                # Restarting SSH
                /usr/bin/systemctl restart sshd
                exit 0
                ;;
        --on | -on)
        SSH_PORT=${SSH_PORT:=22}
                echo "on" >> '/tmp/alcasar_sms_tmp.log'
                $SED "s/^SSH_WAN=.*/SSH_WAN=$SSH_PORT/g" $ALCASAR_CONF
                # Checking if there is already a port other than set
                if [ `grep -E "^.*Port\s[0-9]*" /etc/ssh/sshd_config| grep -vEc "\s22$"` -gt 0 ]
                        then
                                if [ $SSH_PORT -ne 22 ]
                                        then
                                        # Editing SSH configuration - Changing any port other than 22
                                        $SED "/\s22$/! s/^.*Port\s[0-9]*/Port $SSH_PORT/" $SSH_CONF
                                        else
                                        # Editing SSH configuration - Deleting any port other than 22 (as 22 port is used)
                                        $SED "/^.*Port\s[0-9]*/{/\s22$/!d}" $SSH_CONF
                                fi
                        else
                                if [ $SSH_PORT -ne 22 ]
                                        then
                                        # Adding the new SSH port in the config
                                        echo "Port $SSH_PORT" >> $SSH_CONF
                                fi
                        fi
                # Applying iptables
                /usr/local/bin/alcasar-iptables.sh
                # Restarting SSH
                /usr/bin/systemctl restart sshd
        exit 0
        ;;
        *)
                echo "Argument inconnu : $1"
                echo "$usage"
                exit 1
                ;;
esac