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#!/bin/bash
#
# last modified 2017.06.04
#
set -o nounset
set -o errexit
#set -o noclobber
set -o noglob
############################ definitions ###############################
# WORLD = Internet nic
# LAN = LAN nic
IPT=$(which iptables)
IPT6=$(which ip6tables)
WORLD="ens3"
LAN="ens4"
MOD=$(which modprobe)
LANNET="192.168.100.0/24"
#LANNET6="fd54:fc9a:8b7a:765e::/64"
case "$1" in
start)
echo "starting firewall"
############################ load modules ##############################
### iptables-Modul
${MOD} x_tables
${MOD} ip_tables
${MOD} ip6table_filter
${MOD} ip6_tables
### Connection-Tracking-Module
${MOD} nf_conntrack nf_conntrack_helper=0
# ${MOD} nf_conntrack_ipv6
# ${MOD} nf_conntrack_irc
# ${MOD} nf_conntrack_ftp
############################ proc-settings #############################
### activate forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
### Max. 500/second (5/Jiffie)
echo 10 > /proc/sys/net/ipv4/icmp_ratelimit
echo 10 > /proc/sys/net/ipv6/icmp/ratelimit
### ram and ram-timing for IP-de/-fragmentation
echo 262144 > /proc/sys/net/ipv4/ipfrag_high_thresh
echo 196608 > /proc/sys/net/ipv4/ipfrag_low_thresh
echo 30 > /proc/sys/net/ipv4/ipfrag_time
echo 262144 > /proc/sys/net/ipv6/ip6frag_high_thresh
echo 196608 > /proc/sys/net/ipv6/ip6frag_low_thresh
echo 30 > /proc/sys/net/ipv6/ip6frag_time
### TCP-FIN-Timeout protection against DoS-attacks
echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout
### max 3 answers to a TCP-SYN
echo 3 > /proc/sys/net/ipv4/tcp_retries1
### repeat TCP-packets max 15x
echo 15 > /proc/sys/net/ipv4/tcp_retries2
### disable source routing
echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route
echo 0 > /proc/sys/net/ipv6/conf/all/accept_source_route
### ignore bogus icmp_errors
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
### deactivate source redirects
echo 0 > /proc/sys/net/ipv4/conf/all/accept_redirects
echo 0 > /proc/sys/net/ipv6/conf/all/accept_redirects
### deactivate source route
echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route
echo 0 > /proc/sys/net/ipv6/conf/all/accept_source_route
### no helper
echo 0 > /proc/sys/net/netfilter/nf_conntrack_helper
############################ cleanup tables ############################
${IPT} -F
${IPT} -t nat -F
${IPT} -t mangle -F
${IPT} -t nat -X
${IPT} -t mangle -X
${IPT} -X
${IPT6} -F
${IPT6} -t mangle -F
${IPT6} -t mangle -X
${IPT6} -X
########################### default policies ###########################
${IPT} -P INPUT DROP
${IPT} -P OUTPUT DROP
${IPT} -P FORWARD DROP
${IPT6} -P INPUT DROP
${IPT6} -P OUTPUT DROP
${IPT6} -P FORWARD DROP
###################### allow loopback networking #######################
### MY_LOOPY Chain
${IPT} -N MY_LOOPYv4
${IPT6} -N MY_LOOPYv6
### loopback traffic goes to MY_LOOPY
${IPT} -A INPUT -i lo -j MY_LOOPYv4
${IPT6} -A INPUT -i lo -j MY_LOOPYv6
${IPT} -A MY_LOOPYv4 -i lo -j ACCEPT
${IPT6} -A MY_LOOPYv6 -i lo -j ACCEPT
### allow loopback OUTPUT
${IPT} -A OUTPUT -o lo -j ACCEPT
${IPT6} -A OUTPUT -o lo -j ACCEPT
#----------------------------------------------------------------------#
########################## creation of tables ##########################
###########################################################################################################################################################################################################
############################ INPUT ###################################
########################################################################
### connection tracking for INPUT
${IPT} -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
${IPT6} -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
${IPT} -A INPUT -m conntrack --ctstate INVALID -j DROP
${IPT6} -A INPUT -m conntrack --ctstate INVALID -j DROP
###########################################################################################################################################################################################################
###################### nic for Internet: WORLD ######################
########################################################################
### MY_ICMP_WORLD
### create MY_ICMP_WORLD rules
${IPT} -N MY_ICMP_WORLDv4
${IPT6} -N MY_ICMP_WORLDv6
### WORLD icmp traffic goes to MY_ICMP_WORLD
${IPT} -A INPUT -i ${WORLD} -p icmp -j MY_ICMP_WORLDv4
${IPT6} -A INPUT -i ${WORLD} -p icmpv6 -j MY_ICMP_WORLDv6
${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
# ${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j LOG --log-prefix "world_icmp-fragmentation-needed: "
${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type echo-request -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
# ${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j LOG --log-prefix "world_icmp-echo-reply: "
${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
### log rest
#${IPT} -A MY_ICMP_WORLDv4 -j LOG --log-prefix "forbidden from world v4 icmp: "
### standard policy
${IPT} -A MY_ICMP_WORLDv4 -j DROP
### MY_ICMP_WORLDv6
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type packet-too-big -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type time-exceeded -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type echo-reply -j ACCEPT
### router advertisements
${IPT6} -A MY_ICMP_WORLDv6 -i ${WORLD} -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -i ${WORLD} -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT
### router neighbor advertisements
#${IPT6} -A MY_ICMP_WORLDv6 -i ${WORLD} -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT
#${IPT6} -A MY_ICMP_WORLDv6 -i ${WORLD} -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT
### mobile-ipv6
#${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 144 -j ACCEPT
#${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 146 -j ACCEPT
### Inverse Neighbor Discovery
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 141 -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 142 -j ACCEPT
### Multicast groups + multicast listener
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 130 -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 131 -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 132 -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 143 -j ACCEPT
### Send - Certification Path Soli./Advert.
#${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 148 -j ACCEPT
#${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 149 -j ACCEPT
### multicast router
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 151 -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 152 -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 153 -j ACCEPT
### log rest
#${IPT6} -A MY_ICMP_WORLDv6 -j LOG --log-prefix "forbidden from world v6 icmp: "
### standard policy
${IPT6} -A MY_ICMP_WORLDv6 -j DROP
#----------------------------------------------------------------------#
### MY_TCP_WORLD
### create MY_TCP_WORLD rules
${IPT} -N MY_TCP_WORLDv4
${IPT6} -N MY_TCP_WORLDv6
### WORLD tcp traffic goes to MY_TCP_WORLD
${IPT} -A INPUT -i ${WORLD} -p tcp -j MY_TCP_WORLDv4
${IPT6} -A INPUT -i ${WORLD} -p tcp -j MY_TCP_WORLDv6
### drop stealth scans etc. ###
### no flags
${IPT} -A MY_TCP_WORLDv4 -p tcp --tcp-flags ALL NONE -j DROP
### SYN and FIN flags
${IPT} -A MY_TCP_WORLDv4 -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
### SYN and RST flags at the same time
${IPT} -A MY_TCP_WORLDv4 -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
### FIN and RST flags at the same time
${IPT} -A MY_TCP_WORLDv4 -p tcp --tcp-flags FIN,RST FIN,RST -j DROP
### FIN but no ACK
${IPT} -A MY_TCP_WORLDv4 -p tcp --tcp-flags ACK,FIN FIN -j DROP
### PSH but no ACK
${IPT} -A MY_TCP_WORLDv4 -p tcp --tcp-flags ACK,PSH PSH -j DROP
### URG but no ACK
${IPT} -A MY_TCP_WORLDv4 -p tcp --tcp-flags ACK,URG URG -j DROP
### SSH
# ${IPT} -A MY_TCP_WORLDv4 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 22 -j LOG --log-prefix "world_ssh-v4-access: "
${IPT} -A MY_TCP_WORLDv4 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 22 -j ACCEPT
# ${IPT6} -A MY_TCP_WORLDv6 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 22 -j LOG --log-prefix "world_ssh-v6-access: "
${IPT6} -A MY_TCP_WORLDv6 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 22 -j ACCEPT
### log rest
# ${IPT} -A MY_TCP_WORLDv4 -j LOG --log-prefix "forbidden from world v4 tcp: "
# ${IPT6} -A MY_TCP_WORLDv6 -j LOG --log-prefix "forbidden from world v6 tcp: "
### drop rest
${IPT} -A MY_TCP_WORLDv4 -j DROP
${IPT6} -A MY_TCP_WORLDv6 -j DROP
#----------------------------------------------------------------------#
### MY_UDP_WORLD
### create MY_UDP_WORLD rules
${IPT} -N MY_UDP_WORLDv4
${IPT6} -N MY_UDP_WORLDv6
### WORLD tcp traffic goes to MY_TCP_WORLD
${IPT} -A INPUT -i ${WORLD} -p udp -j MY_UDP_WORLDv4
${IPT6} -A INPUT -i ${WORLD} -p udp -j MY_UDP_WORLDv6
### OPENVPN_V2
#${IPT} -A MY_UDP_WORLDv4 -i ${WORLD} -m conntrack --ctstate NEW -p udp --dport 1194 -j LOG --log-prefix "world_openvpn-v4-udp-access: "
#${IPT} -A MY_UDP_WORLDv4 -i ${WORLD} -m conntrack --ctstate NEW -p udp --dport 1194 -j ACCEPT
#${IPT6} -A MY_UDP_WORLDv6 -i ${WORLD} -m conntrack --ctstate NEW -p udp --dport 1194 -j LOG --log-prefix "world_openvpn-v6-udp-access: "
#${IPT6} -A MY_UDP_WORLDv6 -i ${WORLD} -m conntrack --ctstate NEW -p udp --dport 1194 -j ACCEPT
### log rest
# ${IPT} -A MY_UDP_WORLDv4 -j LOG --log-prefix "forbidden from world v4 udp: "
# ${IPT6} -A MY_UDP_WORLDv6 -j LOG --log-prefix "forbidden from world v6 udp: "
### drop rest
${IPT} -A MY_UDP_WORLDv4 -j DROP
${IPT6} -A MY_UDP_WORLDv6 -j DROP
###########################################################################################################################################################################################################
####################### nic for intranet: LAN #######################
########################################################################
### MY_ICMP_LAN
### create MY_ICMP_LAN rules
${IPT} -N MY_ICMP_LANv4
${IPT6} -N MY_ICMP_LANv6
### LAN icmp traffic goes to MY_ICMP_LAN
${IPT} -A INPUT -i ${LAN} -p icmp -j MY_ICMP_LANv4
${IPT6} -A INPUT -i ${LAN} -p icmpv6 -j MY_ICMP_LANv6
${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
# ${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j LOG --log-prefix "LAN_icmp-fragmentation-needed: "
${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type echo-request -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
# ${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j LOG --log-prefix "LAN_icmp-echo-reply: "
${IPT} -A MY_ICMP_LANv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
### log rest
#${IPT} -A MY_ICMP_LANv4 -j LOG --log-prefix "forbidden from lan v4 icmp: "
### standard policy
${IPT} -A MY_ICMP_LANv4 -j DROP
### MY_ICMP_LANv6
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type packet-too-big -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type time-exceeded -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type echo-reply -j ACCEPT
### router advertisements
${IPT6} -A MY_ICMP_LANv6 -i ${LAN} -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -i ${LAN} -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT
### router neighbor advertisements
${IPT6} -A MY_ICMP_LANv6 -i ${LAN} -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -i ${LAN} -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT
### mobile-ipv6
#${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 144 -j ACCEPT
#${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 146 -j ACCEPT
### Inverse Neighbor Discovery
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 141 -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 142 -j ACCEPT
### Multicast groups + multicast listener
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 130 -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 131 -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 132 -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 143 -j ACCEPT
### Send - Certification Path Soli./Advert.
#${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 148 -j ACCEPT
#${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 149 -j ACCEPT
### multicast router
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 151 -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 152 -j ACCEPT
${IPT6} -A MY_ICMP_LANv6 -p icmpv6 --icmpv6-type 153 -j ACCEPT
### log rest
#${IPT6} -A MY_ICMP_LANv6 -j LOG --log-prefix "forbidden from lan v6 icmp: "
### standard policy
${IPT6} -A MY_ICMP_LANv6 -j DROP
#----------------------------------------------------------------------#
### MY_TCP_LAN
### create MY_TCP_LAN rules
${IPT} -N MY_TCP_LANv4
${IPT6} -N MY_TCP_LANv6
### LAN tcp traffic goes to MY_TCP_WORLD
${IPT} -A INPUT -i ${LAN} -p tcp -j MY_TCP_LANv4
${IPT6} -A INPUT -i ${LAN} -p tcp -j MY_TCP_LANv6
### drop stealth scans etc. ###
### no flags
${IPT} -A MY_TCP_LANv4 -p tcp --tcp-flags ALL NONE -j DROP
### SYN and FIN flags
${IPT} -A MY_TCP_LANv4 -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
### SYN and RST flags at the same time
${IPT} -A MY_TCP_LANv4 -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
### FIN and RST flags at the same time
${IPT} -A MY_TCP_LANv4 -p tcp --tcp-flags FIN,RST FIN,RST -j DROP
### FIN but no ACK
${IPT} -A MY_TCP_LANv4 -p tcp --tcp-flags ACK,FIN FIN -j DROP
### PSH but no ACK
${IPT} -A MY_TCP_LANv4 -p tcp --tcp-flags ACK,PSH PSH -j DROP
### URG but no ACK
${IPT} -A MY_TCP_LANv4 -p tcp --tcp-flags ACK,URG URG -j DROP
### SSH
#${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 22 -j LOG --log-prefix "lan_ssh-v4-access: "
${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 22 -j ACCEPT
# ${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 22 -j LOG --log-prefix "lan_ssh-v6-access: "
${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 22 -j ACCEPT
### DHCPD
# ${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 67 -j LOG --log-prefix "lan_dhcpd-67-v4-tcp-access: "
${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 67 -j ACCEPT
# ${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 548 -j LOG --log-prefix "lan_dhcpd-548-v6-tcp-access: "
${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 548 -j ACCEPT
# ${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 547 -j LOG --log-prefix "lan_dhcpd-547-v6-tcp-access: "
${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 547 -j ACCEPT
### DNS
# ${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 53 -j LOG --log-prefix "lan_dns-v4-tcp-access: "
#${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 53 -j ACCEPT
# ${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 53 -j LOG --log-prefix "lan_dns-v6-tcp-access: "
#${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 53 -j ACCEPT
### NTP
# ${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 123 -j LOG --log-prefix "lan_ntp-v4-tcp-access: "
#${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 123 -j ACCEPT
# ${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 123 -j LOG --log-prefix "lan_ntp-v6-tcp-access: "
#${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 123 -j ACCEPT
### TOR
# ${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 9060 -j LOG --log-prefix "lan_tor-v4-tcp-access: "
#${IPT} -A MY_TCP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 9060 -j ACCEPT
# ${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 9060 -j LOG --log-prefix "lan_tor-v4-tcp-access: "
# ${IPT6} -A MY_TCP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p tcp --dport 9060 -j ACCEPT
### IPSEC
#${IPT} -A MY_TCP_LANv4 -i ${LAN} -p 50 -j ACCEPT
#${IPT} -A MY_TCP_LANv4 -i ${LAN} -p 51 -j ACCEPT
### log rest
#${IPT} -A MY_TCP_LANv4 -j LOG --log-prefix "forbidden from lan v4 tcp: "
#${IPT6} -A MY_TCP_LANv6 -j LOG --log-prefix "forbidden from lan v6 tcp: "
### drop rest
${IPT} -A MY_TCP_LANv4 -j DROP
${IPT6} -A MY_TCP_LANv6 -j DROP
#-------------------------------------------------------------------------------------------------------------------#
### MY_UDP_LAN
### create MY_UDP_LAN rules
${IPT} -N MY_UDP_LANv4
${IPT6} -N MY_UDP_LANv6
### LAN UDP traffic goes to MY_UDP_LAN
${IPT} -A INPUT -i ${LAN} -p udp -j MY_UDP_LANv4
${IPT6} -A INPUT -i ${LAN} -p udp -j MY_UDP_LANv6
### DHCPD
# ${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 67 -j LOG --log-prefix "lan_dhcpd-v4-udp-access: "
${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 67 -j ACCEPT
# ${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 546 -j LOG --log-prefix "lan_dhcpd-546-v6-udp-access: "
${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 546 -j ACCEPT
# ${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 547 -j LOG --log-prefix "lan_dhcpd-547-v6-udp-access: "
${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 547 -j ACCEPT
### DNS
# ${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 53 -j LOG --log-prefix "lan_dns-v4-udp-access: "
#${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 53 -j ACCEPT
# ${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 53 -j LOG --log-prefix "lan_dns-v6-udp-access: "
#${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 53 -j ACCEPT
### NTP
# ${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 123 -j LOG --log-prefix "lan_ntp-v4-udp-access: "
#${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 123 -j ACCEPT
# ${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 123 -j LOG --log-prefix "lan_ntp-v6-udp-access: "
#${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 123 -j ACCEPT
### IPSEC
#${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 500 -j ACCEPT
### OPENVPN_V2
#${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 1194 -j LOG --log-prefix "lan_openvpn-v4-udp-access: "
#${IPT} -A MY_UDP_LANv4 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 1194 -j ACCEPT
#${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 1194 -j LOG --log-prefix "lan_openvpn-v6-udp-access: "
#${IPT6} -A MY_UDP_LANv6 -i ${LAN} -m conntrack --ctstate NEW -p udp --dport 1194 -j ACCEPT
### log rest
# ${IPT} -A MY_UDP_LANv4 -j LOG --log-prefix "forbidden from lan v4 udp: "
# ${IPT6} -A MY_UDP_LANv6 -j LOG --log-prefix "forbidden from lan v6 udp: "
### drop rest
${IPT} -A MY_UDP_LANv4 -j DROP
${IPT6} -A MY_UDP_LANv6 -j DROP
###########################################################################################################################################################################################################
################################ OUTPUT ##############################
########################################################################
### FTP,DNS,DHCP,WEB,NTP
${IPT} -A OUTPUT -o ${WORLD} -p tcp -m multiport --dport 21,53,67,68,80,443 -m conntrack --ctstate NEW -j ACCEPT
${IPT} -A OUTPUT -o ${WORLD} -p udp -m multiport --dport 53,67,68 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p tcp -m multiport --dport 21,53,80,137,443,546,547 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p udp -m multiport --dport 53,546,547 -m conntrack --ctstate NEW -j ACCEPT
### samba
${IPT} -A OUTPUT -o ${WORLD} -p tcp -m multiport --dport 139,445 -m conntrack --ctstate NEW -j ACCEPT
${IPT} -A OUTPUT -o ${WORLD} -p udp -m multiport --dport 137,138 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p tcp -m multiport --dport 139,445 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p udp -m multiport --dport 137,138 -m conntrack --ctstate NEW -j ACCEPT
# pings -> world
${IPT} -A OUTPUT -o ${WORLD} -s ${LANNET} -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A OUTPUT -o ${WORLD} -s ${LANNET} -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A OUTPUT -o ${WORLD} -s ${LANNET} -p icmp --icmp-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT} -A OUTPUT -o ${WORLD} -s ${LANNET} -p icmp --icmp-type echo-request -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
${IPT} -A OUTPUT -o ${WORLD} -s ${LANNET} -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p icmpv6 --icmpv6-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p icmpv6 --icmpv6-type packet-too-big -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p icmpv6 --icmpv6-type time-exceeded -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A OUTPUT -o ${WORLD} -p icmpv6 --icmpv6-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
# pings -> lan
#${IPT} -A OUTPUT -o ${LAN} -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
#${IPT} -A OUTPUT -o ${LAN} -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j ACCEPT
#${IPT} -A OUTPUT -o ${LAN} -p icmp --icmp-type echo-request -m limit --limit 10/sec -j ACCEPT
#${IPT} -A OUTPUT -o ${LAN} -p icmp --icmp-type echo-request -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
#${IPT} -A OUTPUT -o ${LAN} -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
#${IPT6} -A OUTPUT -o ${LAN} -p icmpv6 --icmpv6-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
#${IPT6} -A OUTPUT -o ${LAN} -p icmpv6 --icmpv6-type packet-too-big -m conntrack --ctstate RELATED -j ACCEPT
#${IPT6} -A OUTPUT -o ${LAN} -p icmpv6 --icmpv6-type time-exceeded -m conntrack --ctstate RELATED -j ACCEPT
#${IPT6} -A OUTPUT -o ${LAN} -p icmpv6 --icmpv6-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
### state
${IPT} -A OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
${IPT6} -A OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
### allow output to lan
${IPT} -A OUTPUT -o ${LAN} -j ACCEPT
${IPT6} -A OUTPUT -o ${LAN} -j ACCEPT
###########################################################################################################################################################################################################
######################### natting + forwarding #######################
########################################################################
### no need to translate between internal LANs
#${IPT} -t nat -A POSTROUTING -s ${LAN}_NET -d $WLAN_NET -j ACCEPT
#${IPT} -t nat -A PREROUTING -s ${LAN}_NET -d $WLAN_NET -j ACCEPT
#${IPT} -t nat -A POSTROUTING -s ${LAN}_NET -d $KVMS_NET -j ACCEPT
#${IPT} -t nat -A PREROUTING -s ${LAN}_NET -d $KVMS_NET -j ACCEPT
#${IPT} -t nat -A POSTROUTING -s $WLAN_NET -d ${LAN}_NET -j ACCEPT
#${IPT} -t nat -A PREROUTING -s $WLAN_NET -d ${LAN}_NET -j ACCEPT
#${IPT} -t nat -A POSTROUTING -s $WLAN_NET -d $KVMS_NET -j ACCEPT
#${IPT} -t nat -A PREROUTING -s $WLAN_NET -d $KVMS_NET -j ACCEPT
#${IPT} -t nat -A POSTROUTING -s $KVMS_NET -d ${LAN}_NET -j ACCEPT
#${IPT} -t nat -A PREROUTING -s $KVMS_NET -d ${LAN}_NET -j ACCEPT
#${IPT} -t nat -A POSTROUTING -s $KVMS_NET -d $WLAN_NET -j ACCEPT
#${IPT} -t nat -A PREROUTING -s $KVMS_NET -d $WLAN_NET -j ACCEPT
############################# masquerading #############################
#${IPT} -t nat -A POSTROUTING -o ${WORLD} -j MASQUERADE
${IPT} -t nat -A POSTROUTING -o ${WORLD} -j SNAT --to-source 192.168.99.108
############################## forwarding ##############################
############### allow forwarding for exisitng connections ##############
${IPT} -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
${IPT6} -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
### MY_ICMP_WORLD, MY_TCP_WORLD, MY_UDP_WORLD
### lan -> world
### DNS
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p tcp --dport 53 -m conntrack --ctstate NEW -j ACCEPT
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p udp --dport 53 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p tcp --dport 53 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p udp --dport 53 -m conntrack --ctstate NEW -j ACCEPT
### samba
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p tcp -m multiport --dport 139,445 -m conntrack --ctstate NEW -j ACCEPT
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p udp -m multiport --dport 137,138 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p tcp -m multiport --dport 139,445 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p udp -m multiport --dport 137,138 -m conntrack --ctstate NEW -j ACCEPT
### web
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p tcp -m multiport --dport 80,443 -m conntrack --ctstate NEW -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p tcp -m multiport --dport 80,443 -m conntrack --ctstate NEW -j ACCEPT
### pings
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p icmp --icmp-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p icmp --icmp-type echo-request -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p icmp --icmp-type echo-reply -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type echo-reply -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type packet-too-big -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type time-exceeded -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
### Inverse Neighbor Discovery
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 141 -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 142 -j ACCEPT
### Multicast groups + multicast listener
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 130 -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 131 -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 132 -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 143 -j ACCEPT
### multicast router
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 151 -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 152 -j ACCEPT
${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p icmpv6 --icmpv6-type 153 -j ACCEPT
### avira updated
#${IPT} -A FORWARD -i ${LAN} -o ${WORLD} -s ${LANNET} -p tcp -m multiport --dport 7000,7001,7080,7010,7100 -m conntrack --ctstate NEW -j ACCEPT
#${IPT6} -A FORWARD -i ${LAN} -o ${WORLD} -p tcp -m multiport --dport 7000,7001,7080,7010,7100 -m conntrack --ctstate NEW -j ACCEPT
########################################################################
######################## end of rules ##################################
########################################################################
;;
stop)
echo "stopping firewall"
echo "stopping firewall"
### flush tables
${IPT} -F
${IPT} -t nat -F
${IPT} -t mangle -F
${IPT} -t nat -X
${IPT} -t mangle -X
${IPT6} -F
${IPT6} -t mangle -F
${IPT6} -t mangle -X
### WORLD
${IPT} -F MY_ICMP_WORLDv4
${IPT} -X MY_ICMP_WORLDv4
${IPT6} -F MY_ICMP_WORLDv6
${IPT6} -X MY_ICMP_WORLDv6
${IPT} -F MY_TCP_WORLDv4
${IPT} -X MY_TCP_WORLDv4
${IPT6} -F MY_TCP_WORLDv6
${IPT6} -X MY_TCP_WORLDv6
${IPT} -F MY_UDP_WORLDv4
${IPT} -X MY_UDP_WORLDv4
${IPT6} -F MY_UDP_WORLDv6
${IPT6} -X MY_UDP_WORLDv6
### LAN
${IPT} -F MY_ICMP_LANv4
${IPT} -X MY_ICMP_LANv4
${IPT6} -F MY_ICMP_LANv6
${IPT6} -X MY_ICMP_LANv6
${IPT} -F MY_TCP_LANv4
${IPT} -X MY_TCP_LANv4
${IPT6} -F MY_TCP_LANv6
${IPT6} -X MY_TCP_LANv6
${IPT} -F MY_UDP_LANv4
${IPT} -X MY_UDP_LANv4
${IPT6} -F MY_UDP_LANv6
${IPT6} -X MY_UDP_LANv6
### delete tables
${IPT} -X
${IPT6} -X
### deactivate ip 4+6 forwarding
echo 0 > /proc/sys/net/ipv4/ip_forward
echo 0 > /proc/sys/net/ipv6/conf/all/forwarding
### IPv6 Default-Policies setzen
${IPT} -P INPUT ACCEPT
${IPT} -P OUTPUT ACCEPT
${IPT} -P FORWARD ACCEPT
${IPT6} -P INPUT ACCEPT
${IPT6} -P OUTPUT ACCEPT
${IPT6} -P FORWARD ACCEPT
echo "firewall stopped"
;;
status)
echo "table filter"
${IPT} -L -vn
echo "table nat"
${IPT} -t nat -L -vn
echo "table mangle"
${IPT} -t mangle -L -vn
echo "table filter"
${IPT6} -L -vn
echo "table mangle"
${IPT6} -t mangle -L -vn
;;
restart)
iptables-save > /root/iptables.tmp
iptables-restore < /root/iptables.tmp
rm -f /root/iptables.tmp
;;
########################### usage of script ###########################
*)
echo "Fehlerhafter Aufruf"
echo "Syntax: $0 {start|stop|restart|status}"
exit 1
;;
esac
exit 0