github.com/arkadijs/deis@v1.5.1/contrib/util/custom-firewall.sh (about)

     1  #!/bin/env bash
     2  
     3  echo "Obtaining IP addresses of the nodes in the cluster..."
     4  MACHINES_IP=$(fleetctl list-machines --fields=ip --no-legend | awk -vORS=, '{ print $1 }' | sed 's/,$/\n/')
     5  
     6  if [ -n "$NEW_NODE" ]; then
     7    MACHINES_IP+=,$NEW_NODE
     8  fi
     9  
    10  echo "Cluster IPs: $MACHINES_IP"
    11  
    12  echo "Creating firewall Rules..."
    13  # Firewall Template
    14  template=$(cat <<EOF
    15  *filter
    16  
    17  :INPUT DROP [0:0]
    18  :FORWARD DROP [0:0]
    19  :OUTPUT ACCEPT [0:0]
    20  :Firewall-INPUT - [0:0]
    21  -A INPUT -j Firewall-INPUT
    22  -A FORWARD -j Firewall-INPUT
    23  -A Firewall-INPUT -i lo -j ACCEPT
    24  -A Firewall-INPUT -p icmp --icmp-type echo-reply -j ACCEPT
    25  -A Firewall-INPUT -p icmp --icmp-type destination-unreachable -j ACCEPT
    26  -A Firewall-INPUT -p icmp --icmp-type time-exceeded -j ACCEPT
    27  
    28  # Ping
    29  -A Firewall-INPUT -p icmp --icmp-type echo-request -j ACCEPT
    30  
    31  # Accept any established connections
    32  -A Firewall-INPUT -m conntrack --ctstate  ESTABLISHED,RELATED -j ACCEPT
    33  
    34  # Enable the traffic between the nodes of the cluster
    35  -A Firewall-INPUT -s $MACHINES_IP -j ACCEPT
    36  
    37  # Allow connections from docker container
    38  -A Firewall-INPUT -i docker0 -j ACCEPT
    39  
    40  # Accept ssh, http, https and git
    41  -A Firewall-INPUT -m conntrack --ctstate NEW -m multiport -p tcp --dports 22,2222,80,443 -j ACCEPT
    42  
    43  # Log and drop everything else
    44  -A Firewall-INPUT -j LOG
    45  -A Firewall-INPUT -j REJECT
    46  
    47  COMMIT
    48  EOF
    49  )
    50  
    51  if [[ -z "$DEBUG" ]]; then
    52    echo "$template"
    53  fi
    54  
    55  echo "Saving firewall Rules"
    56  echo "$template" | sudo tee /var/lib/iptables/rules-save > /dev/null
    57  
    58  echo "Enabling iptables service"
    59  sudo systemctl enable iptables-restore.service
    60  
    61  # Flush custom rules before the restore (so this script is idempotent)
    62  sudo /usr/sbin/iptables -F Firewall-INPUT
    63  
    64  echo "Loading custom iptables firewall"
    65  sudo /sbin/iptables-restore --noflush /var/lib/iptables/rules-save
    66  
    67  echo "Done"