wit-network-config/files/firewall

#!/bin/bash
### BEGIN INIT INFO
# Provides:          scriptname
# Required-Start:    $network
# Required-Stop:     $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: iptables
# Description:       Enable firewall rules
### END INIT INFO

exec 1> >(logger -s -t $(basename $0)) 2>&1

case $1 in
   start)
        echo -n "firewall start..."
     ### IPv4
        iptables -P INPUT ACCEPT
        iptables -F INPUT
       #unencrypted traffic
        iptables -A INPUT                                                   -p esp                                                   -j ACCEPT   # ipsec
        iptables -A INPUT                                                   -p udp   --dport    500 --sport  500                     -j ACCEPT   # ipsec
        iptables -A INPUT                                                   -p udp   --dport   4500 --sport 4500                     -j ACCEPT   # ipsec
        iptables -A INPUT -s 170.199.217.0                                  -p tcp   --dport     22                                  -j ACCEPT   # ssh from bastion
        iptables -A INPUT -s 170.199.217.0                                  -p udp   --sport     53                                  -j ACCEPT   # dns replies from bastion
        iptables -A INPUT -s 170.199.210.99                                 -p tcp   --sport    443                                  -j ACCEPT   # mirrors.wit.com
        iptables -A INPUT                                                   -p icmp                                                  -j ACCEPT
       #traffic we want to see encrypted over the VPN
        iptables -A INPUT -m policy --pol ipsec --dir in                    -p udp   --dport   4789                                  -j ACCEPT   # vxlan traffic
        iptables -A INPUT -m policy --pol ipsec --dir in                    -p tcp   --dport   6789                                  -j ACCEPT   # ceph mon traffic
        iptables -A INPUT -m policy --pol ipsec --dir in                    -p tcp   --sport   6789                                  -j ACCEPT   # ceph mon traffic
        iptables -A INPUT -m policy --pol ipsec --dir in  -m multiport      -p tcp   --dports  6800:7300                             -j ACCEPT   # ceph traffic
        iptables -A INPUT -m policy --pol ipsec --dir in  -m multiport      -p tcp   --sports  6800:7300                             -j ACCEPT   # ceph traffic
        iptables -A INPUT -m policy --pol ipsec --dir in  -m multiport      -p tcp   --dports 49152:49215                            -j ACCEPT   # libvirt live migration
        iptables -A INPUT -i lo                           -m multiport      -p tcp   --sports  6800:7300                             -j ACCEPT   # local ceph traffic
        iptables -A INPUT -i lo                           -m multiport      -p tcp   --dports  6800:7300                             -j ACCEPT   # local ceph traffic
       ### mgmt
        iptables -A INPUT -i mgmt                                           -p tcp   --dport  22                                     -j ACCEPT
        iptables -A INPUT -i mgmt -m state --state ESTABLISHED,RELATED                                                               -j ACCEPT
       ### DROP the rest
        iptables -P INPUT DROP


       #special tables
        iptables -t mangle -F
        iptables -t nat -F
        iptables -t raw -F

        iptables -t raw -A PREROUTING ! -i mgmt1 -j NOTRACK
        iptables -t raw -A OUTPUT     ! -o mgmt  -j NOTRACK



     #### IPv6
        ip6tables -P INPUT ACCEPT
        ip6tables -F INPUT
       #unencrypted traffic
        ip6tables -A INPUT                               -p esp                                                 -j ACCEPT   # ipsec
        ip6tables -A INPUT                               -p udp  --dport   500 --sport  500                     -j ACCEPT   # ipsec
        ip6tables -A INPUT                               -p udp  --dport  4500 --sport 4500                     -j ACCEPT   # ipsec
        ip6tables -A INPUT                               -p ipv6-icmp                                           -j ACCEPT   # ping
        ip6tables -A INPUT -s 2604:bbc0:0:113::1         -p tcp  --dport    22                                  -j ACCEPT   # ssh from bastion
        ip6tables -A INPUT -s 2604:bbc0:0:113::1         -p udp  --sport    53                                  -j ACCEPT   # dns replies from bastion
        ip6tables -A INPUT -s 2001:67c:1560:8003::c7     -p udp  --sport   123                                  -j ACCEPT   # ntp
        ip6tables -A INPUT -s 2001:67c:1560:8003::c8     -p udp  --sport   123                                  -j ACCEPT   # ntp
	ip6tables -A INPUT -s fe80::/10                  -p tcp  --sport   179                                  -j ACCEPT   # bgp (allow init as well as responding)
	ip6tables -A INPUT -s fe80::/10                  -p tcp  --dport   179                                  -j ACCEPT   # bgp (allow init as well as responding)
       ### mgmt
	ip6tables -A INPUT -i mgmt1 -s fe80::/10         -p udp  --dport   546                                  -j ACCEPT   # allow dhcp replys, unlcear why this needs the physical interface instead of the vrf
        ip6tables -A INPUT -i mgmt                       -p tcp  --dport    22                                  -j ACCEPT   # allow ssh from mgmt
        ip6tables -A INPUT -i mgmt   -m state --state ESTABLISHED,RELATED                                       -j ACCEPT   # allow stateful connections over mgmt
       ### DROP the rest
        ip6tables -P INPUT DROP


       #special tables
        ip6tables -t mangle -F
        ip6tables -t nat -F
        ip6tables -t raw -F

        ip6tables -t raw -A PREROUTING ! -i mgmt1 -j NOTRACK
        ip6tables -t raw -A OUTPUT     ! -o mgmt  -j NOTRACK


        ;;

   stop)
        echo -n "firewall stop..."

        #### Firewall rules
        iptables -P INPUT ACCEPT
        iptables -F
        iptables -t raw -F
        iptables -t nat -F
        iptables -t mangle -F

        ip6tables -P INPUT ACCEPT
        ip6tables -F
        ip6tables -t raw -F
        ip6tables -t nat -F
        ip6tables -t mangle -F

        echo " done"
        ;;
   restart)
        #$0 stop
        $0 start
        ;;
   *)
        echo "use $0 [start|stop|restart]"
        ;;
esac