#!/bin/bash

DOMAIN_NAME=$1
MY_USERNAME=$2

# Directory where source code is downloaded and compiled
INSTALL_DIR=/root/build

function initial_setup {
  apt-get -y update
  apt-get -y dist-upgrade
  apt-get -y install ca-certificates emacs24
}

function install_editor {
  update-alternatives --set editor /usr/bin/emacs24
}

function enable_backports {
  echo "deb http://ftp.us.debian.org/debian jessie-backports main" >> /etc/apt/sources.list
}

function remove_proprietary_repos {
  sed 's/ non-free//g' /etc/apt/sources.list > /tmp/sources.list
  cp -f /tmp/sources.list /etc/apt/sources.list
}

function update_the_kernel {
  cd /opt/scripts/tools
  ./update_kernel.sh --kernel v3.15.10-bone7
}

function enable_zram {
  echo "options zram num_devices=1" >> /etc/modprobe.d/zram.conf
  echo "#!/bin/bash" > /etc/init.d/zram
  echo "### BEGIN INIT INFO" >> /etc/init.d/zram
  echo "# Provides: zram" >> /etc/init.d/zram
  echo "# Required-Start:" >> /etc/init.d/zram
  echo "# Required-Stop:" >> /etc/init.d/zram
  echo "# Default-Start: 2 3 4 5" >> /etc/init.d/zram
  echo "# Default-Stop: 0 1 6" >> /etc/init.d/zram
  echo "# Short-Description: Increased Performance In Linux With zRam (Virtual Swap Compressed in RAM)" >> /etc/init.d/zram
  echo "# Description: Adapted from systemd scripts at https://github.com/mystilleef/FedoraZram" >> /etc/init.d/zram
  echo "### END INIT INFO" >> /etc/init.d/zram
  echo "start() {" >> /etc/init.d/zram
  echo "    # get the number of CPUs" >> /etc/init.d/zram
  echo "    num_cpus=$(grep -c processor /proc/cpuinfo)" >> /etc/init.d/zram
  echo "    # if something goes wrong, assume we have 1" >> /etc/init.d/zram
  echo "    [ \"$num_cpus\" != 0 ] || num_cpus=1" >> /etc/init.d/zram
  echo "    # set decremented number of CPUs" >> /etc/init.d/zram
  echo "    decr_num_cpus=$((num_cpus - 1))" >> /etc/init.d/zram
  echo "    # get the amount of memory in the machine" >> /etc/init.d/zram
  echo "    mem_total_kb=$(grep MemTotal /proc/meminfo | grep -E --only-matching '[[:digit:]]+')" >> /etc/init.d/zram
  echo "    mem_total=$((mem_total_kb * 1024))" >> /etc/init.d/zram
  echo "    # load dependency modules" >> /etc/init.d/zram
  echo "    modprobe zram num_devices=$num_cpus" >> /etc/init.d/zram
  echo "    # initialize the devices" >> /etc/init.d/zram
  echo "    for i in $(seq 0 $decr_num_cpus); do" >> /etc/init.d/zram
  echo "    echo $((mem_total / num_cpus)) > /sys/block/zram$i/disksize" >> /etc/init.d/zram
  echo "    done" >> /etc/init.d/zram
  echo "    # Creating swap filesystems" >> /etc/init.d/zram
  echo "    for i in $(seq 0 $decr_num_cpus); do" >> /etc/init.d/zram
  echo "    mkswap /dev/zram$i" >> /etc/init.d/zram
  echo "    done" >> /etc/init.d/zram
  echo "    # Switch the swaps on" >> /etc/init.d/zram
  echo "    for i in $(seq 0 $decr_num_cpus); do" >> /etc/init.d/zram
  echo "    swapon -p 100 /dev/zram$i" >> /etc/init.d/zram
  echo "    done" >> /etc/init.d/zram
  echo "}" >> /etc/init.d/zram
  echo "stop() {" >> /etc/init.d/zram
  echo "    # get the number of CPUs" >> /etc/init.d/zram
  echo "    num_cpus=$(grep -c processor /proc/cpuinfo)" >> /etc/init.d/zram
  echo "    # set decremented number of CPUs" >> /etc/init.d/zram
  echo "    decr_num_cpus=$((num_cpus - 1))" >> /etc/init.d/zram
  echo "    # Switching off swap" >> /etc/init.d/zram
  echo "    for i in $(seq 0 $decr_num_cpus); do" >> /etc/init.d/zram
  echo "    if [ \"$(grep /dev/zram$i /proc/swaps)\" != \"\" ]; then" >> /etc/init.d/zram
  echo "    swapoff /dev/zram$i" >> /etc/init.d/zram
  echo "    sleep 1" >> /etc/init.d/zram
  echo "    fi" >> /etc/init.d/zram
  echo "    done" >> /etc/init.d/zram
  echo "    sleep 1" >> /etc/init.d/zram
  echo "    rmmod zram" >> /etc/init.d/zram
  echo "}" >> /etc/init.d/zram
  echo "case \"$1\" in" >> /etc/init.d/zram
  echo "    start)" >> /etc/init.d/zram
  echo "        start" >> /etc/init.d/zram
  echo "        ;;" >> /etc/init.d/zram
  echo "    stop)" >> /etc/init.d/zram
  echo "        stop" >> /etc/init.d/zram
  echo "        ;;" >> /etc/init.d/zram
  echo "    restart)" >> /etc/init.d/zram
  echo "        stop" >> /etc/init.d/zram
  echo "        sleep 3" >> /etc/init.d/zram
  echo "        start" >> /etc/init.d/zram
  echo "        ;;" >> /etc/init.d/zram
  echo "    *)" >> /etc/init.d/zram
  echo "        echo \"Usage: $0 {start|stop|restart}\"" >> /etc/init.d/zram
  echo "        RETVAL=1" >> /etc/init.d/zram
  echo "esac" >> /etc/init.d/zram
  echo "exit $RETVAL" >> /etc/init.d/zram
  chmod +x /etc/init.d/zram
  update-rc.d zram defaults
}

function hardware_random_number_generator
  apt-get -y install rng-tools
  sed 's|#HRNGDEVICE=/dev/hwrng|HRNGDEVICE=/dev/hwrng|g' /etc/default/rng-tools > /tmp/rng-tools
  cp -f /tmp/rng-tools /etc/default/rng-tools
  service rng-tools restart
}

function configure_ssh {
  sed 's/PermitRootLogin without-password/PermitRootLogin no/g' /etc/ssh/sshd_config > /tmp/sshd_config
  cp -f /tmp/sshd_config /etc/ssh/sshd_config
  sed 's/X11Forwarding yes/X11Forwarding no/g' /etc/ssh/sshd_config > /tmp/sshd_config
  cp -f /tmp/sshd_config /etc/ssh/sshd_config
  sed 's/ServerKeyBits 1024/ServerKeyBits 4096/g' /etc/ssh/sshd_config > /tmp/sshd_config
  cp -f /tmp/sshd_config /etc/ssh/sshd_config
  sed 's/TCPKeepAlive yes/TCPKeepAlive no/g' /etc/ssh/sshd_config > /tmp/sshd_config
  cp -f /tmp/sshd_config /etc/ssh/sshd_config
  sed 's|HostKey /etc/ssh/ssh_host_dsa_key|#HostKey /etc/ssh/ssh_host_dsa_key|g' /etc/ssh/sshd_config > /tmp/sshd_config
  cp -f /tmp/sshd_config /etc/ssh/sshd_config
  sed 's|HostKey /etc/ssh/ssh_host_ecdsa_key|#HostKey /etc/ssh/ssh_host_ecdsa_key|g' /etc/ssh/sshd_config > /tmp/sshd_config
  cp -f /tmp/sshd_config /etc/ssh/sshd_config
  echo "ClientAliveInterval 60" >> /etc/ssh/sshd_config
  echo "ClientAliveCountMax 3" >> /etc/ssh/sshd_config
  echo "Ciphers aes256-ctr,aes128-ctr" >> /etc/ssh/sshd_config
  echo "MACs hmac-sha2-512,hmac-sha2-256,hmac-ripemd160
  KexAlgorithms diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1" >> /etc/ssh/sshd_config
  service ssh restart
  apt-get -y install fail2ban
}

function regenerate_ssh_keys {
  rm -f /etc/ssh/ssh_host_*
  dpkg-reconfigure openssh-server
  service ssh restart
}

function set_your_domain_name {
  echo "$DOMAIN_NAME" > /etc/hostname
  hostname $DOMAIN_NAME
  echo "127.0.1.1  $DOMAIN_NAME" >> /etc/hosts
}

function time_synchronisation {
  apt-get -y install build-essential automake git pkg-config autoconf libtool libssl-dev
  apt-get -y remove ntpdate
  mkdir $INSTALL_DIR
  cd $INSTALL_DIR
  git clone https://github.com/ioerror/tlsdate.git
  cd $INSTALL_DIR/tlsdate
  ./autogen.sh
  ./configure
  make
  make install

  echo "#!/bin/bash" > /usr/bin/updatedate
  echo "TIMESOURCE=google.com" >> /usr/bin/updatedate
  echo "TIMESOURCE2=www.ptb.de" >> /usr/bin/updatedate
  echo "LOGFILE=/var/log/tlsdate.log" >> /usr/bin/updatedate
  echo "TIMEOUT=5" >> /usr/bin/updatedate
  echo "EMAIL=$MY_USERNAME@$DOMAIN_NAME" >> /usr/bin/updatedate
  echo "# File which contains the previous date as a number" >> /usr/bin/updatedate
  echo "BEFORE_DATE_FILE=/var/log/tlsdateprevious.txt" >> /usr/bin/updatedate
  echo "# File which contains the previous date as a string" >> /usr/bin/updatedate
  echo "BEFORE_FULLDATE_FILE=/var/log/tlsdate.txt" >> /usr/bin/updatedate
  echo "DATE_BEFORE=$(date)" >> /usr/bin/updatedate
  echo "BEFORE=$(date -d "$Y-$M-$D" '+%s')" >> /usr/bin/updatedate
  echo "BACKWARDS_BETWEEN=0" >> /usr/bin/updatedate
  echo "# If the date was previously set" >> /usr/bin/updatedate
  echo "if [[ -f \"$BEFORE_DATE_FILE\" ]]; then" >> /usr/bin/updatedate
  echo "    BEFORE_FILE=$(cat $BEFORE_DATE_FILE)" >> /usr/bin/updatedate
  echo "    BEFORE_FULLDATE=$(cat $BEFORE_FULLDATE_FILE)" >> /usr/bin/updatedate
  echo "    # is the date going backwards?" >> /usr/bin/updatedate
  echo "    if (( BEFORE_FILE > BEFORE )); then" >> /usr/bin/updatedate
  echo "        echo -n \"Date went backwards between tlsdate updates. \" >> $LOGFILE" >> /usr/bin/updatedate
  echo "        echo -n \"$BEFORE_FILE > $BEFORE, \" >> $LOGFILE" >> /usr/bin/updatedate
  echo "        echo \"$BEFORE_FULLDATE > $DATE_BEFORE\" >> $LOGFILE" >> /usr/bin/updatedate
  echo "        # Send a warning email" > /usr/bin/updatedate
  echo "        echo $(tail $LOGFILE -n 2) | mail -s \"tlsdate anomaly\" $EMAIL" >> /usr/bin/updatedate
  echo "        # Try another time source" >> /usr/bin/updatedate
  echo "        TIMESOURCE=$TIMESOURCE2" >> /usr/bin/updatedate
  echo "        # try running without any parameters" >> /usr/bin/updatedate
  echo "        tlsdate >> $LOGFILE" >> /usr/bin/updatedate
  echo "        BACKWARDS_BETWEEN=1" >> /usr/bin/updatedate
  echo "    fi" >> /usr/bin/updatedate
  echo "fi" >> /usr/bin/updatedate
  echo "# Set the date" >> /usr/bin/updatedate
  echo "/usr/bin/timeout $TIMEOUT tlsdate -l -t -H $TIMESOURCE -p 443 >> $LOGFILE" >> /usr/bin/updatedate
  echo "DATE_AFTER=$(date)" >> /usr/bin/updatedate
  echo "AFTER=$(date -d "$Y-$M-$D" '+%s')" >> /usr/bin/updatedate
  echo "# After setting the date did it go backwards?" >> /usr/bin/updatedate
  echo "if (( AFTER < BEFORE )); then" >> /usr/bin/updatedate
  echo "    echo \"Incorrect date: $DATE_BEFORE -> $DATE_AFTER\" >> $LOGFILE" >> /usr/bin/updatedate
  echo "    # Send a warning email" >> /usr/bin/updatedate
  echo "    echo $(tail $LOGFILE -n 2) | mail -s \"tlsdate anomaly\" $EMAIL" >> /usr/bin/updatedate
  echo "    # Try resetting the date from another time source" >> /usr/bin/updatedate
  echo "    /usr/bin/timeout $TIMEOUT tlsdate -l -t -H $TIMESOURCE2 -p 443 >> $LOGFILE" >> /usr/bin/updatedate
  echo "    DATE_AFTER=$(date)" >> /usr/bin/updatedate
  echo "    AFTER=$(date -d "$Y-$M-$D" '+%s')" >> /usr/bin/updatedate
  echo "else" >> /usr/bin/updatedate
  echo "    echo -n $TIMESOURCE >> $LOGFILE" >> /usr/bin/updatedate
  echo "    if [[ -f \"$BEFORE_DATE_FILE\" ]]; then" >> /usr/bin/updatedate
  echo "        echo -n \" \" >> $LOGFILE" >> /usr/bin/updatedate
  echo "        echo -n $BEFORE_FILE >> $LOGFILE" >> /usr/bin/updatedate
  echo "    fi" >> /usr/bin/updatedate
  echo "    echo -n \" \" >> $LOGFILE" >> /usr/bin/updatedate
  echo "    echo -n $BEFORE >> $LOGFILE" >> /usr/bin/updatedate
  echo "    echo -n \" \" >> $LOGFILE" >> /usr/bin/updatedate
  echo "    echo -n $AFTER >> $LOGFILE" >> /usr/bin/updatedate
  echo "    echo -n \" \" >> $LOGFILE" >> /usr/bin/updatedate
  echo "    echo $DATE_AFTER >> $LOGFILE" >> /usr/bin/updatedate
  echo "fi" >> /usr/bin/updatedate
  echo "# Log the last date" >> /usr/bin/updatedate
  echo "if [ BACKWARDS_BETWEEN == 0 ]; then" >> /usr/bin/updatedate
  echo "    echo \"$AFTER\" > $BEFORE_DATE_FILE" >> /usr/bin/updatedate
  echo "    echo \"$DATE_AFTER\" > $BEFORE_FULLDATE_FILE" >> /usr/bin/updatedate
  echo "    exit 0" >> /usr/bin/updatedate
  echo "else" >> /usr/bin/updatedate
  echo "    exit 1" >> /usr/bin/updatedate
  echo "fi" >> /usr/bin/updatedate
  chmod +x /usr/bin/updatedate
  echo "*/15           * *   *   *   root /usr/bin/updatedate" >> /etc/crontab
  service cron restart

  echo "#!/bin/bash" > /etc/init.d/tlsdate
  echo "# /etc/init.d/tlsdate" >> /etc/init.d/tlsdate
  echo "### BEGIN INIT INFO" >> /etc/init.d/tlsdate
  echo "# Provides:          tlsdate" >> /etc/init.d/tlsdate
  echo "# Required-Start:    $remote_fs $syslog" >> /etc/init.d/tlsdate
  echo "# Required-Stop:     $remote_fs $syslog" >> /etc/init.d/tlsdate
  echo "# Default-Start:     2 3 4 5" >> /etc/init.d/tlsdate
  echo "# Default-Stop:      0 1 6" >> /etc/init.d/tlsdate
  echo "# Short-Description: Initially calls tlsdate with the timewarp option" >> /etc/init.d/tlsdate
  echo "# Description:       Initially calls tlsdate with the timewarp option" >> /etc/init.d/tlsdate
  echo "### END INIT INFO" >> /etc/init.d/tlsdate
  echo "# Author: Bob Mottram <bob@robotics.uk.to>" >> /etc/init.d/tlsdate
  echo "PATH='/usr/local/sbin:/usr/local/bin:/usr/bin:/sbin:/usr/sbin:/bin'" >> /etc/init.d/tlsdate
  echo "LOGFILE=\"/var/log/tlsdate.log\"" >> /etc/init.d/tlsdate
  echo "TLSDATECOMMAND=\"tlsdate --timewarp -l -H www.ptb.de -p 443 >> $LOGFILE\"" >> /etc/init.d/tlsdate
  echo "#Start-Stop here" >> /etc/init.d/tlsdate
  echo "case "$1" in" >> /etc/init.d/tlsdate
  echo "  start)" >> /etc/init.d/tlsdate
  echo "    echo "tlsdate started"" >> /etc/init.d/tlsdate
  echo "    $TLSDATECOMMAND" >> /etc/init.d/tlsdate
  echo "    ;;" >> /etc/init.d/tlsdate
  echo "  stop)" >> /etc/init.d/tlsdate
  echo "    echo "tlsdate stopped"" >> /etc/init.d/tlsdate
  echo "    ;;" >> /etc/init.d/tlsdate
  echo "  restart)" >> /etc/init.d/tlsdate
  echo "    echo "tlsdate restarted"" >> /etc/init.d/tlsdate
  echo "    $TLSDATECOMMAND" >> /etc/init.d/tlsdate
  echo "    ;;" >> /etc/init.d/tlsdate
  echo "    *)" >> /etc/init.d/tlsdate
  echo "  echo "Usage: $0 {start|stop|restart}"" >> /etc/init.d/tlsdate
  echo "  exit 1" >> /etc/init.d/tlsdate
  echo "  ;;" >> /etc/init.d/tlsdate
  echo "esac" >> /etc/init.d/tlsdate
  echo "exit 0" >> /etc/init.d/tlsdate
  chmod +x /etc/init.d/tlsdate
  update-rc.d tlsdate defaults
}

function defend_against_port_scanning
  apt-get -y install portsentry
}

function configure_firewall {
  iptables -P INPUT ACCEPT
  ip6tables -P INPUT ACCEPT
  iptables -F
  ip6tables -F
  iptables -X
  ip6tables -X
  iptables -P INPUT DROP
  ip6tables -P INPUT DROP
}

function configure_firewall_for_email {
  iptables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT
  iptables -A INPUT -i eth0 -p tcp --dport 25 -j ACCEPT
  iptables -A INPUT -i eth0 -p tcp --dport 587 -j ACCEPT
  iptables -A INPUT -i eth0 -p tcp --dport 465 -j ACCEPT
  iptables -A INPUT -i eth0 -p tcp --dport 993 -j ACCEPT
}

function save_firewall_settings {
	# TODO
}

function configure_internet_protocol {
  sed "s/#net.ipv4.tcp_syncookies=1/net.ipv4.tcp_syncookies=1/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv4.conf.all.accept_redirects = 0/net.ipv4.conf.all.accept_redirects = 0/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv6.conf.all.accept_redirects = 0/net.ipv6.conf.all.accept_redirects = 0/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv4.conf.all.send_redirects = 0/net.ipv4.conf.all.send_redirects = 0/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv4.conf.all.accept_source_route = 0/net.ipv4.conf.all.accept_source_route = 0/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv6.conf.all.accept_source_route = 0/net.ipv6.conf.all.accept_source_route = 0/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv4.conf.default.rp_filter=1/net.ipv4.conf.default.rp_filter=1/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv4.conf.all.rp_filter=1/net.ipv4.conf.all.rp_filter=1/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=0/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  sed "s/#net.ipv6.conf.all.forwarding=1/net.ipv6.conf.all.forwarding=0/g" /etc/sysctl.conf > /tmp/sysctl.conf
  cp -f /tmp/sysctl.conf /etc/sysctl.conf
  echo "# ignore pings" >> /etc/sysctl.conf
  echo "net.ipv4.icmp_echo_ignore_all = 1" >> /etc/sysctl.conf
  echo "net.ipv6.icmp_echo_ignore_all = 1" >> /etc/sysctl.conf
  echo "# disable ipv6" >> /etc/sysctl.conf
  echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
  echo "net.ipv4.tcp_synack_retries = 2" >> /etc/sysctl.conf
  echo "net.ipv4.tcp_syn_retries = 1" >> /etc/sysctl.conf
  echo "# keepalive" >> /etc/sysctl.conf
  echo "net.ipv4.tcp_keepalive_probes = 9" >> /etc/sysctl.conf
  echo "net.ipv4.tcp_keepalive_intvl = 75" >> /etc/sysctl.conf
  echo "net.ipv4.tcp_keepalive_time = 7200" >> /etc/sysctl.conf
}

function script_to_make_self_signed_certificates {
  echo "#!/bin/bash" > /usr/bin/makecert
  echo "HOSTNAME=$1" >> /usr/bin/makecert
  echo "COUNTRY_CODE=\"US\"" >> /usr/bin/makecert
  echo "AREA=\"Free Speech Zone\"" >> /usr/bin/makecert
  echo "LOCATION=\"Freedomville\"" >> /usr/bin/makecert
  echo "ORGANISATION=\"Freedombone\"" >> /usr/bin/makecert
  echo "UNIT=\"Freedombone Unit\"" >> /usr/bin/makecert
  echo "if ! which openssl > /dev/null ;then" >> /usr/bin/makecert
  echo "    echo "$0: openssl is not installed, exiting" 1>&2" >> /usr/bin/makecert
  echo "    exit 1" >> /usr/bin/makecert
  echo "fi" >> /usr/bin/makecert
  echo "openssl req -x509 -nodes -days 3650 -sha256 -subj \"/O=$ORGANISATION/OU=$UNIT/C=$COUNTRY_CODE/ST=$AREA/L=$LOCATION/CN=$HOSTNAME\" -newkey rsa:4096 -keyout /etc/ssl/private/$HOSTNAME.key -out /etc/ssl/certs/$HOSTNAME.crt" >> /usr/bin/makecert
  echo "openssl dhparam -check -text -5 1024 -out /etc/ssl/certs/$HOSTNAME.dhparam" >> /usr/bin/makecert
  echo "chmod 400 /etc/ssl/private/$HOSTNAME.key" >> /usr/bin/makecert
  echo "chmod 640 /etc/ssl/certs/$HOSTNAME.crt" >> /usr/bin/makecert
  echo "chmod 640 /etc/ssl/certs/$HOSTNAME.dhparam" >> /usr/bin/makecert
  echo "/etc/init.d/nginx reload" >> /usr/bin/makecert
  echo "# add the public certificate to a separate directory" >> /usr/bin/makecert
  echo "# so that we can redistribute it easily" >> /usr/bin/makecert
  echo "if [ ! -d /etc/ssl/mycerts ]; then" >> /usr/bin/makecert
  echo "  mkdir /etc/ssl/mycerts" >> /usr/bin/makecert
  echo "fi" >> /usr/bin/makecert
  echo "cp /etc/ssl/certs/$HOSTNAME.crt /etc/ssl/mycerts" >> /usr/bin/makecert
  echo "# Create a bundle of your certificates" >> /usr/bin/makecert
  echo "cat /etc/ssl/mycerts/*.crt > /etc/ssl/freedombone-bundle.crt" >> /usr/bin/makecert
  echo "tar -czvf /etc/ssl/freedombone-certs.tar.gz /etc/ssl/mycerts/*.crt" >> /usr/bin/makecert
  chmod +x /usr/bin/makecert
}

function configure_email {
  apt-get -y remove postfix
  apt-get -y install exim4 sasl2-bin swaks libnet-ssleay-perl procmail
  echo "dc_eximconfig_configtype='internet'" > /etc/exim4/update-exim4.conf.conf
  echo "dc_other_hostnames='$DOMAIN_NAME'" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_local_interfaces=''" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_readhost=''" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_relay_domains=''" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_minimaldns='false'" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_relay_nets='192.168.1.0/24'" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_smarthost=''" >> /etc/exim4/update-exim4.conf.conf
  echo "CFILEMODE='644'" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_use_split_config='false'" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_hide_mailname=''" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_mailname_in_oh='true'" >> /etc/exim4/update-exim4.conf.conf
  echo "dc_localdelivery='maildir_home'" >> /etc/exim4/update-exim4.conf.conf
  update-exim4.conf
  sed "s/START=no/START=yes/g" /etc/default/saslauthd > /tmp/saslauthd
  cp -f /tmp/saslauthd /etc/default/saslauthd
  /etc/init.d/saslauthd start
  makecert exim
  mv /etc/ssl/private/exim.key /etc/exim4
  mv /etc/ssl/certs/exim.crt /etc/exim4
  mv /etc/ssl/certs/exim.dhparam /etc/exim4
  chown root:Debian-exim /etc/exim4/exim.key /etc/exim4/exim.crt /etc/exim4/exim.dhparam
  chmod 640 /etc/exim4/exim.key /etc/exim4/exim.crt /etc/exim4/exim.dhparam
#editor /etc/exim4/exim4.conf.template
}

initial_setup
install_editor
enable_backports
remove_proprietary_repos
update_the_kernel
enable_zram
hardware_random_number_generator
configure_ssh
regenerate_ssh_keys
set_your_domain_name
time_synchronisation
defend_against_port_scanning
configure_firewall
configure_firewall_for_email
save_firewall_settings
configure_internet_protocol
script_to_make_self_signed_certificates
configure_email