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elly.kvm.idms.small
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#!/bin/bash -x
# last modified 2017.06.04
#
# iptables for a kvm-host with 1 nic
#
set -o nounset
set -o errexit
#set -o noclobber
set -o noglob
########################### definitions ###########################
# WORLD = Internet nic
# NAT = natted vm
# ISOLY = isolated vm
IPT=$(which iptables)
IPT6=$(which ip6tables)
IPS=$(which ipset)
WORLD="eth0"
NAT="virbr0"
ISOLY="virbr2"
MOD=$(which modprobe)
INTLAN="192.168.4.0/24"
ISOLYNET="192.168.200.0/24"
NATNET="192.168.122.0/24"
BADHOSTSLIST="blackhole"
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
${IPT6} -X
### ipset
#${IPS} flush ${BADHOSTSLIST}
#${IPS} create ${BADHOSTSLIST} hash:ip hashsize 4096
#${IPS} restore < /root/${BADHOSTSLIST}.bak
########################### default policies ###########################
${IPT} -P INPUT DROP
${IPT} -P OUTPUT ACCEPT
${IPT} -P FORWARD DROP
${IPT6} -P INPUT DROP
${IPT6} -P OUTPUT ACCEPT
${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
#----------------------------------------------------------------------#
########################## 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
### drop unpolite networkers ;-)
${IPT} -A MY_ICMP_WORLDv4 -i ${WORLD} -m set --match-set ${BADHOSTSLIST} src -p icmp -j DROP
${IPT} -A MY_ICMP_WORLDv4 -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
#${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
### 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
### Send - Certification Path Soli./Advert.
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 148 -j ACCEPT
${IPT6} -A MY_ICMP_WORLDv6 -p icmpv6 --icmpv6-type 149 -j ACCEPT
### log rest
#${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 ${WORLD} -p tcp -j MY_TCP_WORLDv6
### drop unpolite networkers ;-)
#${IPT} -A MY_TCP_WORLDv4 -i ${WORLD} -m set --match-set ${BADHOSTSLIST} src -p tcp -j DROP
### 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
### http(s)
${IPT} -A MY_TCP_WORLDv4 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 80 -j ACCEPT
${IPT6} -A MY_TCP_WORLDv6 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 80 -j ACCEPT
${IPT} -A MY_TCP_WORLDv4 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 443 -j ACCEPT
${IPT6} -A MY_TCP_WORLDv6 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 443 -j ACCEPT
### tor
${IPT} -A MY_TCP_WORLDv4 -i ${WORLD} -s 192.168.4.0/24 -m conntrack --ctstate NEW -p tcp --dport 9050 -j ACCEPT
#${IPT6} -A MY_TCP_WORLDv6 -i ${WORLD} -m conntrack --ctstate NEW -p tcp --dport 9050 -j ACCEPT
### log rest
#${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 ${WORLD} -p udp -j MY_UDP_WORLDv6
### drop unpolite networkers ;-)
#${IPT} -A MY_UDP_WORLDv4 -i ${WORLD} -m set --match-set ${BADHOSTSLIST} src -p udp -j DROP
### log rest
#${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 virbr0: NAT #######################
########################################################################
### MY_ICMP_NAT
### create MY_ICMP_NAT rules
${IPT} -N MY_ICMP_NATv4
${IPT6} -N MY_ICMP_NATv6
### NAT icmp traffic goes to MY_ICMP_NAT
${IPT} -A INPUT -i ${NAT} -p icmp -j MY_ICMP_NATv4
${IPT6} -A INPUT -i ${NAT} -p icmpv6 -j MY_ICMP_NATv6
${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
#${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j LOG --log-prefix "NAT_icmp-fragmentation-needed: "
${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type echo-request -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
#${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j LOG --log-prefix "NAT_icmp-echo-reply: "
${IPT} -A MY_ICMP_NATv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
### log rest
#${IPT} -A MY_ICMP_NATv4 -j LOG --log-prefix "forbidden from NAT v4 icmp: "
### standard policy
${IPT} -A MY_ICMP_NATv4 -j DROP
### MY_ICMP_NATv6
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type packet-too-big -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type time-exceeded -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type echo-reply -j ACCEPT
### router advertisements
${IPT6} -A MY_ICMP_NATv6 -i ${NAT} -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT
${IPT6} -A MY_ICMP_NATv6 -i ${NAT} -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT
### router neighbor advertisements
#${IPT6} -A MY_ICMP_NATv6 -i ${NAT} -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -i ${NAT} -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT
### mobile-ipv6
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 144 -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 146 -j ACCEPT
### Inverse Neighbor Discovery
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 141 -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 142 -j ACCEPT
### Multicast groups + multicast listener
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 130 -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 131 -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 132 -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 143 -j ACCEPT
### Send - Certification Path Soli./Advert.
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 148 -j ACCEPT
${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 149 -j ACCEPT
### multicast router
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 151 -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 152 -j ACCEPT
#${IPT6} -A MY_ICMP_NATv6 -p icmpv6 --icmpv6-type 153 -j ACCEPT
### log rest
#${IPT6} -A MY_ICMP_NATv6 -j LOG --log-prefix "forbidden from NAT v6 icmp: "
### standard policy
${IPT6} -A MY_ICMP_NATv6 -j DROP
#----------------------------------------------------------------------#
### MY_TCP_NAT
### create MY_TCP_NAT rules
${IPT} -N MY_TCP_NATv4
${IPT6} -N MY_TCP_NATv6
### NAT tcp traffic goes to MY_TCP_WORLD
${IPT} -A INPUT -i ${NAT} -p tcp -j MY_TCP_NATv4
${IPT6} -A INPUT -i ${NAT} -p tcp -j MY_TCP_NATv6
### drop stealth scans etc. ###
### no flags
${IPT} -A MY_TCP_NATv4 -p tcp --tcp-flags ALL NONE -j DROP
### SYN and FIN flags
${IPT} -A MY_TCP_NATv4 -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
### SYN and RST flags at the same time
${IPT} -A MY_TCP_NATv4 -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
### FIN and RST flags at the same time
${IPT} -A MY_TCP_NATv4 -p tcp --tcp-flags FIN,RST FIN,RST -j DROP
### FIN but no ACK
${IPT} -A MY_TCP_NATv4 -p tcp --tcp-flags ACK,FIN FIN -j DROP
### PSH but no ACK
${IPT} -A MY_TCP_NATv4 -p tcp --tcp-flags ACK,PSH PSH -j DROP
### URG but no ACK
${IPT} -A MY_TCP_NATv4 -p tcp --tcp-flags ACK,URG URG -j DROP
### log rest
#${IPT} -A MY_TCP_NATv4 -j LOG --log-prefix "forbidden from NAT v4 tcp: "
#${IPT6} -A MY_TCP_NATv6 -j LOG --log-prefix "forbidden from NAT v6 tcp: "
### drop rest
${IPT} -A MY_TCP_NATv4 -j DROP
${IPT6} -A MY_TCP_NATv6 -j DROP
#-------------------------------------------------------------------------------------------------------------------#
### MY_UDP_NAT
### create MY_UDP_NAT rules
${IPT} -N MY_UDP_NATv4
${IPT6} -N MY_UDP_NATv6
### NAT UDP traffic goes to MY_UDP_NAT
${IPT} -A INPUT -i ${NAT} -p udp -j MY_UDP_NATv4
${IPT6} -A INPUT -i ${NAT} -p udp -j MY_UDP_NATv6
### log rest
#${IPT} -A MY_UDP_NATv4 -j LOG --log-prefix "forbidden from NAT v4 udp: "
#${IPT6} -A MY_UDP_NATv6 -j LOG --log-prefix "forbidden from NAT v6 udp: "
### drop rest
${IPT} -A MY_UDP_NATv4 -j DROP
${IPT6} -A MY_UDP_NATv6 -j DROP
###########################################################################################################################################################################################################
####################### nic for virbr1: ISOLY #######################
########################################################################
### MY_ICMP_ISOLY
### create MY_ICMP_ISOLY rules
${IPT} -N MY_ICMP_ISOLYv4
${IPT6} -N MY_ICMP_ISOLYv6
### ISOLY icmp traffic goes to MY_ICMP_ISOLY
${IPT} -A INPUT -i ${ISOLY} -p icmp -j MY_ICMP_ISOLYv4
${IPT6} -A INPUT -i ${ISOLY} -p icmpv6 -j MY_ICMP_ISOLYv6
${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
#${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j LOG --log-prefix "ISOLY_icmp-fragmentation-needed: "
${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type fragmentation-needed -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type echo-request -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
#${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j LOG --log-prefix "ISOLY_icmp-echo-reply: "
${IPT} -A MY_ICMP_ISOLYv4 -p icmp --icmp-type echo-reply -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
### log rest
#${IPT} -A MY_ICMP_ISOLYv4 -j LOG --log-prefix "forbidden from ISOLY v4 icmp: "
### standard policy
${IPT} -A MY_ICMP_ISOLYv4 -j DROP
### MY_ICMP_ISOLYv6
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type destination-unreachable -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type packet-too-big -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type time-exceeded -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type parameter-problem -m conntrack --ctstate RELATED -j ACCEPT
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type echo-request -m limit --limit 10/sec -j ACCEPT
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type echo-reply -j ACCEPT
### router advertisements
${IPT6} -A MY_ICMP_ISOLYv6 -i ${ISOLY} -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT
${IPT6} -A MY_ICMP_ISOLYv6 -i ${ISOLY} -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT
### router neighbor advertisements
#${IPT6} -A MY_ICMP_ISOLYv6 -i ${ISOLY} -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT
#${IPT6} -A MY_ICMP_ISOLYv6 -i ${ISOLY} -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT
### Inverse Neighbor Discovery
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 141 -j ACCEPT
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 142 -j ACCEPT
### Multicast groups + multicast listener
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 130 -j ACCEPT
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 131 -j ACCEPT
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 132 -j ACCEPT
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 143 -j ACCEPT
### Send - Certification Path Soli./Advert.
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 148 -j ACCEPT
${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 149 -j ACCEPT
### multicast router
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 151 -j ACCEPT
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 152 -j ACCEPT
#${IPT6} -A MY_ICMP_ISOLYv6 -p icmpv6 --icmpv6-type 153 -j ACCEPT
### log rest
#${IPT6} -A MY_ICMP_ISOLYv6 -j LOG --log-prefix "forbidden from ISOLY v6 icmp: "
### standard policy
${IPT6} -A MY_ICMP_ISOLYv6 -j DROP
#----------------------------------------------------------------------#
### MY_TCP_ISOLY
### create MY_TCP_ISOLY rules
${IPT} -N MY_TCP_ISOLYv4
${IPT6} -N MY_TCP_ISOLYv6
### ISOLY tcp traffic goes to MY_TCP_WORLD
${IPT} -A INPUT -i ${ISOLY} -p tcp -j MY_TCP_ISOLYv4
${IPT6} -A INPUT -i ${ISOLY} -p tcp -j MY_TCP_ISOLYv6
### drop stealth scans etc. ###
### no flags
${IPT} -A MY_TCP_ISOLYv4 -p tcp --tcp-flags ALL NONE -j DROP
### SYN and FIN flags
${IPT} -A MY_TCP_ISOLYv4 -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
### SYN and RST flags at the same time
${IPT} -A MY_TCP_ISOLYv4 -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
### FIN and RST flags at the same time
${IPT} -A MY_TCP_ISOLYv4 -p tcp --tcp-flags FIN,RST FIN,RST -j DROP
### FIN but no ACK
${IPT} -A MY_TCP_ISOLYv4 -p tcp --tcp-flags ACK,FIN FIN -j DROP
### PSH but no ACK
${IPT} -A MY_TCP_ISOLYv4 -p tcp --tcp-flags ACK,PSH PSH -j DROP
### URG but no ACK
${IPT} -A MY_TCP_ISOLYv4 -p tcp --tcp-flags ACK,URG URG -j DROP
### ssh
#${IPT} -A MY_TCP_ISOLYv4 -i ${ISOLY} -m conntrack --ctstate NEW -p tcp --dport 22 -j LOG --log-prefix "isoly_web-v4-access: "
${IPT} -A MY_TCP_ISOLYv4 -i ${ISOLY} -m conntrack --ctstate NEW -p tcp --dport 22 -j ACCEPT
### log rest
#${IPT} -A MY_TCP_ISOLYv4 -j LOG --log-prefix "forbidden from ISOLY v4 tcp: "
#${IPT6} -A MY_TCP_ISOLYv6 -j LOG --log-prefix "forbidden from ISOLY v6 tcp: "
### drop rest
${IPT} -A MY_TCP_ISOLYv4 -j DROP
${IPT6} -A MY_TCP_ISOLYv6 -j DROP
#-------------------------------------------------------------------------------------------------------------------#
### MY_UDP_ISOLY
### create MY_UDP_ISOLY rules
${IPT} -N MY_UDP_ISOLYv4
${IPT6} -N MY_UDP_ISOLYv6
### ISOLY UDP traffic goes to MY_UDP_ISOLY
${IPT} -A INPUT -i ${ISOLY} -p udp -j MY_UDP_ISOLYv4
${IPT6} -A INPUT -i ${ISOLY} -p udp -j MY_UDP_ISOLYv6
### log rest
#${IPT} -A MY_UDP_ISOLYv4 -j LOG --log-prefix "forbidden from ISOLY v4 udp: "
#${IPT6} -A MY_UDP_ISOLYv6 -j LOG --log-prefix "forbidden from ISOLY v6 udp: "
### drop rest
${IPT} -A MY_UDP_ISOLYv4 -j DROP
${IPT6} -A MY_UDP_ISOLYv6 -j DROP
########################################################################
########################################################################
############################# masquerading #############################
${IPT} -t nat -A POSTROUTING -o ${WORLD} -j SNAT --to-source 192.168.4.62
#${IPT} -t nat -A POSTROUTING -o ${WORLD} -j MASQUERADE
#${IPT6} -t nat -A POSTROUTING -o ${WORLD} -j MASQUERADE
#${IPT} -t nat -A POSTROUTING -o ${KVMS} -j SNAT --to-source 192.168.99.254
############### 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
############################## forwarding ##############################
### nics: world, nat, isoly
### nat -> world
${IPT} -A FORWARD -o ${WORLD} -s ${NATNET} -m conntrack --ctstate NEW -j ACCEPT
### lo -> world
#${IPT} -A FORWARD -o ${WORLD} -s lo -m conntrack --ctstate NEW -j ACCEPT
### -> isoly
#${IPT} -A FORWARD -o ${ISOLY} -s ${ISOLYNET} -m conntrack --ctstate NEW -j ACCEPT
#${IPT} -A FORWARD -o ${KVMS} -s ${ISOLY} -m conntrack --ctstate NEW -j ACCEPT
#${IPT6} -A FORWARD -o ${ISOLY} -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
${IPT6} -t mangle -X
### flush and destroy ipset, uncomment if you really wanna lost all entries !!!
#${IPS} save ${BADHOSTSLIST} > /root/${BADHOSTSLIST}.bak
#${IPS} flush ${BADHOSTSLIST}
#${IPS} destroy ${BADHOSTSLIST}
### 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
### NAT
${IPT} -F MY_ICMP_NATv4
${IPT} -X MY_ICMP_NATv4
${IPT6} -F MY_ICMP_NATv6
${IPT6} -X MY_ICMP_NATv6
${IPT} -F MY_TCP_NATv4
${IPT} -X MY_TCP_NATv4
${IPT6} -F MY_TCP_NATv6
${IPT6} -X MY_TCP_NATv6
${IPT} -F MY_UDP_NATv4
${IPT} -X MY_UDP_NATv4
${IPT6} -F MY_UDP_NATv6
${IPT6} -X MY_UDP_NATv6
### ISOLY
${IPT} -F MY_ICMP_ISOLYv4
${IPT} -X MY_ICMP_ISOLYv4
${IPT6} -F MY_ICMP_ISOLYv6
${IPT6} -X MY_ICMP_ISOLYv6
${IPT} -F MY_TCP_ISOLYv4
${IPT} -X MY_TCP_ISOLYv4
${IPT6} -F MY_TCP_ISOLYv6
${IPT6} -X MY_TCP_ISOLYv6
${IPT} -F MY_UDP_ISOLYv4
${IPT} -X MY_UDP_ISOLYv4
${IPT6} -F MY_UDP_ISOLYv6
${IPT6} -X MY_UDP_ISOLYv6
### 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