freedomboneeee/src/freedombone-client

#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# License
# =======
#
# Copyright (C) 2015 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

CURR_USER=$USER

# Version number of this script
VERSION="1.01"

# mesh networking settings
BRIDGE_BATMAN_IPV6=
PEER_BATMAN_IPV6=

# ssh (from https://stribika.github.io/2015/01/04/secure-secure-shell.html)
SSH_CIPHERS="chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr"
SSH_MACS="hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@openssh.com"
SSH_KEX="curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256"
SSH_HOST_KEY_ALGORITHMS="ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-ed25519,ssh-rsa"

# see https://stribika.github.io/2015/01/04/secure-secure-shell.html
function ssh_remove_small_moduli {
  sudo awk '$5 > 2000' /etc/ssh/moduli > /home/$CURR_USER/moduli
  sudo mv /home/$CURR_USER/moduli /etc/ssh/moduli
}

function configure_ssh_client {
  #sudo sed -i 's/#   PasswordAuthentication.*/   PasswordAuthentication no/g' /etc/ssh/ssh_config
  #sudo sed -i 's/#   ChallengeResponseAuthentication.*/   ChallengeResponseAuthentication no/g' /etc/ssh/ssh_config
  sudo sed -i "s/#   HostKeyAlgorithms.*/   HostKeyAlgorithms $SSH_HOST_KEY_ALGORITHMS/g" /etc/ssh/ssh_config
  sudo sed -i "s/#   Ciphers.*/   Ciphers $SSH_CIPHERS/g" /etc/ssh/ssh_config
  sudo sed -i "s/#   MACs.*/   MACs $SSH_MACS/g" /etc/ssh/ssh_config
  if ! grep -q "HostKeyAlgorithms" /etc/ssh/ssh_config; then
      sudo echo "   HostKeyAlgorithms $SSH_HOST_KEY_ALGORITHMS" >> /etc/ssh/ssh_config
  fi
  sudo sed -i "s/Ciphers.*/Ciphers $SSH_CIPHERS/g" /etc/ssh/ssh_config
  if ! grep -q "Ciphers " /etc/ssh/ssh_config; then
      sudo echo "   Ciphers $SSH_CIPHERS" >> /etc/ssh/ssh_config
  fi
  sudo sed -i "s/MACs.*/MACs $SSH_MACS/g" /etc/ssh/ssh_config
  if ! grep -q "MACs " /etc/ssh/ssh_config; then
      sudo echo "   MACs $SSH_MACS" >> /etc/ssh/ssh_config
  fi

  # Create ssh keys
  if [ ! -f /home/$CURR_USER/.ssh/id_ed25519 ]; then
      ssh-keygen -t ed25519 -o -a 100
  fi
  if [ ! -f /home/$CURR_USER/.ssh/id_rsa ]; then
      ssh-keygen -t rsa -b 4096 -o -a 100
  fi

  ssh_remove_small_moduli

  echo ''
  echo 'Copy the following into a file called /home/username/.ssh/authorized_keys on the Freedombone server'
  echo ''
  echo $(cat /home/$CURR_USER/.ssh/id_rsa.pub)
  echo $(cat /home/$CURR_USER/.ssh/id_ed25519.pub)
  echo ''
}

function mesh_batman {
  if [ ! $BRIDGE_BATMAN_IPV6 ]; then
      return
  fi
  sudo apt-get -y install iproute bridge-utils libnetfilter-conntrack3 batctl
  sudo apt-get -y install python-dev libevent-dev ebtables python-pip git

  sudo modprobe batman-adv
  [ $? -ne 0 ] && echo "B.A.T.M.A.N module not available" && exit 76482
  if ! grep -q "batman_adv" /etc/modules; then
      sudo echo 'batman_adv' >> /etc/modules
  fi

  # If no address has been given then create a ramdom one
  if [ ! $PEER_BATMAN_IPV6 ]; then
      hexarray=( 1 2 3 4 5 6 7 8 9 0 a b c d e f )
      a=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
      b=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
      c=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
      d=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
      PEER_BATMAN_IPV6="$IPV6_NETWORK:$a:$b:$c:$d"
  fi

  sudo cp /etc/network/interfaces ~/interfaces
  if ! grep -q "# Mesh Networking (B.A.T.M.A.N)" ~/interfaces; then
      echo '' >> ~/interfaces
      echo '# Mesh Networking (B.A.T.M.A.N)' >> ~/interfaces
      echo 'iface bat0 inet6 static' >> ~/interfaces
      echo '    pre-up modprobe ipv6' >> ~/interfaces
      echo "    address $PEER_BATMAN_IPV6" >> ~/interfaces
      echo '    netmask 64' >> ~/interfaces
      sudo mv ~/interfaces /etc/network/interfaces
  else
      sudo rm ~/interfaces
  fi

  echo '#!/bin/bash' > /tmp/freedombone_mesh
  echo '' > /tmp/freedombone_mesh
  echo '# stop network manager to make the mesh network work' >> /tmp/freedombone_mesh
  echo 'service networking stop' >> /tmp/freedombone_mesh
  echo '' >> /tmp/freedombone_mesh
  echo -n '# configure the wlan interface to operate with ' >> /tmp/freedombone_mesh
  echo 'mtus of 1532(batman requires it) and turn enc off ' >> /tmp/freedombone_mesh
  echo 'to ensure it works' >> /tmp/freedombone_mesh
  echo 'ifconfig wlan0 down' >> /tmp/freedombone_mesh
  echo 'ifconfig wlan0 mtu 1532' >> /tmp/freedombone_mesh
  echo 'iwconfig wlan0 enc off' >> /tmp/freedombone_mesh
  echo '' >> /tmp/freedombone_mesh
  echo '# add the interface to the ad-hoc network - or create it.' >> /tmp/freedombone_mesh
  echo -n "iwconfig wlan0 mode ad-hoc essid mesh ap " >> /tmp/freedombone_mesh
  echo "$BRIDGE_BATMAN_IPV6 channel 2" >> /tmp/freedombone_mesh
  echo '' >> /tmp/freedombone_mesh
  echo -n '# add wlan0 to the batman-adv virtual interface(so it can ' >> /tmp/freedombone_mesh
  echo 'communicate with other batman-adv nodes)' >> /tmp/freedombone_mesh
  echo 'batctl if add wlan0' >> /tmp/freedombone_mesh
  echo 'ifconfig wlan0 up' >> /tmp/freedombone_mesh
  echo 'ifconfig bat0 up' >> /tmp/freedombone_mesh
  echo '' >> /tmp/freedombone_mesh
  echo '# get the ip address for the node from the bridge connected to the dhcp server' >> /tmp/freedombone_mesh
  echo 'dhclient bat0' >> /tmp/freedombone_mesh
  echo '' >> /tmp/freedombone_mesh
  echo 'exit 0' >> /tmp/freedombone_mesh
  chmod +x /tmp/freedombone_mesh
  sudo mv /tmp/freedombone_mesh /usr/bin/mesh
}

function show_help {
    echo ''
    echo 'freedombone-client --bridge-ip [mesh bridge IPv6 address]'
    echo ''
    exit 0
}

while [[ $# > 1 ]]
do
key="$1"

case $key in
    -h|--help)
    show_help
    ;;
    --bridge-ip)
    shift
    BRIDGE_BATMAN_IPV6="$1"
    ;;
    *)
    # unknown option
    ;;
esac
shift
done

echo 'Configuring client'
configure_ssh_client
mesh_batman
echo 'Configuration complete'
if [[ $BRIDGE_BATMAN_IPV6 ]]; then
    echo ''
    echo 'Type "sudo mesh" to connect to the mesh network'
fi
exit 0