385 lines
14 KiB
Bash
Executable file
385 lines
14 KiB
Bash
Executable file
#!/bin/sh
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# minifirewall
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# See https://gitea.evolix.org/evolix/minifirewall
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# Copyright (c) 2007-2020 Evolix
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 3
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# of the License.
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# Description
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# script for standalone server
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# Start minifirewall
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#
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# Variables configuration
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#########################
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# nft path
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NFT=/usr/sbin/nft
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# Configuration
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configfile="/etc/default/minifirewall"
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DOCKER=$(grep "DOCKER=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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INT=$(grep "INT=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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# sysctl network security settings
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##################################
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# Don't answer to broadcast pings
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echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
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# Ignore bogus ICMP responses
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echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
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# Disable Source Routing
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for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do
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echo 0 > $i
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done
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# Enable TCP SYN cookies to avoid TCP-SYN-FLOOD attacks
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# cf http://cr.yp.to/syncookies.html
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echo 1 > /proc/sys/net/ipv4/tcp_syncookies
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# Disable ICMP redirects
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for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do
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echo 0 > $i
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done
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for i in /proc/sys/net/ipv4/conf/*/send_redirects; do
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echo 0 > $i
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done
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# Enable Reverse Path filtering : verify if responses use same network interface
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for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
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echo 1 > $i
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done
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# log des paquets avec adresse incoherente
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for i in /proc/sys/net/ipv4/conf/*/log_martians; do
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echo 1 > $i
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done
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# IPTables configuration
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########################
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if ! test -f $configfile; then
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echo "$configfile does not exist" >&2
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exit 1
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fi
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. $configfile
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# Flush everything first
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$NFT flush ruleset
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# Add a filter table
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$NFT add table inet minifirewall
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# Add the input, forward, and output base chains. The policy for input and forward will be to drop. The policy for output will be to accept.
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$NFT add chain inet minifirewall minifirewall_input '{ type filter hook input priority 0 ; policy drop ; }'
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$NFT add chain inet minifirewall minifirewall_forward '{ type filter hook forward priority 0 ; policy drop ; }'
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$NFT add chain inet minifirewall minifirewall_output '{ type filter hook output priority 0 ; policy accept ; }'
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# Add set with trusted IP addresses
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#$NFT define minifirewall_trusted_ips = {$(echo $TRUSTEDIPS | sed 's/ /, /g')}
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$NFT add set inet minifirewall minifirewall_trusted_ips { type ipv4_addr\;}
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$NFT add element inet minifirewall minifirewall_trusted_ips {$(echo $TRUSTEDIPS | sed 's/ /, /g')}
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# Add set with privileged IP addresses
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#$NFT define minifirewall_privileged_ips = {$(echo $PRIVILEGIEDIPS | sed 's/ /, /g')}
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$NFT add set inet minifirewall minifirewall_privileged_ips { type ipv4_addr\;}
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$NFT add element inet minifirewall minifirewall_privileged_ips {$(echo $PRIVILEGIEDIPS | sed 's/ /, /g')}
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# Add TCP/UDP chains for protected, public, semi-public and private ports
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$NFT add chain inet minifirewall protected_tcp_ports
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$NFT add chain inet minifirewall protected_udp_ports
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$NFT add chain inet minifirewall public_tcp_ports
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$NFT add chain inet minifirewall public_udp_ports
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$NFT add chain inet minifirewall semipublic_tcp_ports
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$NFT add chain inet minifirewall semipublic_udp_ports
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$NFT add chain inet minifirewall private_tcp_ports
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$NFT add chain inet minifirewall private_udp_ports
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# Related and established traffic is accepted
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$NFT add rule inet minifirewall minifirewall_input ct state related,established accept
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# All loopback interface traffic is accepted
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$NFT add rule inet minifirewall minifirewall_input iif lo accept
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# Allow services for $INTLAN (local server or local network) is accepted
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$NFT add rule inet minifirewall minifirewall_input ip saddr $INTLAN accept
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# Any invalid traffic is dropped
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$NFT add rule inet minifirewall minifirewall_input ct state invalid drop
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# ICMP and IGMP traffic is accepted
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$NFT add rule inet minifirewall minifirewall_input meta l4proto ipv6-icmp icmpv6 type '{ destination-unreachable, packet-too-big, time-exceeded, parameter-problem, mld-listener-query, mld-listener-report, mld-listener-reduction, nd-router-solicit, nd-router-advert, nd-neighbor-solicit, nd-neighbor-advert, ind-neighbor-solicit, ind-neighbor-advert, mld2-listener-report }' accept
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$NFT add rule inet minifirewall minifirewall_input meta l4proto icmp icmp type '{ destination-unreachable, router-solicitation, router-advertisement, time-exceeded, parameter-problem }' accept
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$NFT add rule inet minifirewall minifirewall_input ip protocol igmp accept
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# New UDP traffic from trusted IPs jumps to the private_udp_ports chain
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$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_ips meta l4proto udp ct state new jump private_udp_ports'
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# New TCP traffic from trusted IPs jumps to the private_tcp_ports chain
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$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump private_tcp_ports'
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# New UDP traffic from trusted IPs and privileged IPs jumps to the semipublic_udp_ports chain
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$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_privileged_ips meta l4proto udp ct state new jump semipublic_udp_ports'
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$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_ips meta l4proto udp ct state new jump semipublic_udp_ports'
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# New TCP traffic from trusted IPs and privileged IPs jumps to the semipublic_tcp_ports chain
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$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_privileged_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump semipublic_tcp_ports'
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$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump semipublic_tcp_ports'
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# New UDP traffic from any other IP jumps to the public_udp_ports chain
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$NFT add rule inet minifirewall minifirewall_input 'meta l4proto udp ct state new jump public_udp_ports'
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# New TCP traffic from any other IP jumps to the public_tcp_ports chain
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$NFT add rule inet minifirewall minifirewall_input 'meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump public_tcp_ports'
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# Reject all traffic that was not processed by other rules
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$NFT add rule inet minifirewall minifirewall_input meta l4proto udp reject
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$NFT add rule inet minifirewall minifirewall_input meta l4proto tcp reject with tcp reset
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$NFT add rule inet minifirewall minifirewall_input counter reject with icmpx type port-unreachable
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# Feed public_tcp_ports chain with public TCP ports
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for x in $SERVICESTCP1
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do
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$NFT add rule inet minifirewall public_tcp_ports tcp dport $x accept
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done
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# Feed public_udp_ports chain with public UDP ports
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for x in $SERVICESUDP1
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do
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$NFT add rule inet minifirewall public_tcp_ports udp dport $x accept
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done
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# Feed semipublic_tcp_ports chain with semi-public TCP ports
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for x in $SERVICESTCP2
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do
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$NFT add rule inet minifirewall semipublic_tcp_ports tcp dport $x accept
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done
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# Feed semipublic_udp_ports chain with semi-public UDP ports
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for x in $SERVICESUDP2
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do
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$NFT add rule inet minifirewall semipublic_udp_ports udp dport $x accept
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done
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# Feed private_tcp_ports chain with private TCP ports
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for x in $SERVICESTCP3
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do
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$NFT add rule inet minifirewall private_tcp_ports tcp dport $x accept
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done
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# Feed private_udp_ports chain with private UDP ports
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for x in $SERVICESUDP3
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do
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$NFT add rule inet minifirewall private_udp_ports udp dport $x accept
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done
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# Feed protected_tcp_ports chain with protected TCP ports
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for x in $SERVICESTCP1p
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do
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$NFT add rule inet minifirewall protected_tcp_ports tcp dport $x accept
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done
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# Feed protected_udp_ports chain with protected UDP ports
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for x in $SERVICESUDP1p
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do
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$NFT add rule inet minifirewall protected_udp_ports udp dport $x accept
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done
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### We avoid "martians" packets, typical when W32/Blaster virus
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## attacked windowsupdate.com and DNS was changed to 127.0.0.1
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## $NFT -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
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#$NFT -A INPUT -s $LOOPBACK ! -i lo -j DROP
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#
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#
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#if [ "$DOCKER" = "on" ]; then
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#
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# $NFT -N MINIFW-DOCKER-TRUSTED
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# $NFT -A MINIFW-DOCKER-TRUSTED -j DROP
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#
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# $NFT -N MINIFW-DOCKER-PRIVILEGED
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# $NFT -A MINIFW-DOCKER-PRIVILEGED -j MINIFW-DOCKER-TRUSTED
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# $NFT -A MINIFW-DOCKER-PRIVILEGED -j RETURN
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#
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# $NFT -N MINIFW-DOCKER-PUB
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# $NFT -A MINIFW-DOCKER-PUB -j MINIFW-DOCKER-PRIVILEGED
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# $NFT -A MINIFW-DOCKER-PUB -j RETURN
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#
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# # Flush DOCKER-USER if exist, create it if absent
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# if chain_exists 'DOCKER-USER'; then
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# $NFT -F DOCKER-USER
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# else
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# $NFT -N DOCKER-USER
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# fi;
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#
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# # Pipe new connection through MINIFW-DOCKER-PUB
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# $NFT -A DOCKER-USER -i $INT -m state --state NEW -j MINIFW-DOCKER-PUB
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# $NFT -A DOCKER-USER -j RETURN
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#
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#fi
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#
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#
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## Local services restrictions
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##############################
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#
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#if [ "$DOCKER" = "on" ]; then
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#
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# # Public services defined in SERVICESTCP1 & SERVICESUDP1
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# for dstport in $SERVICESTCP1
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# do
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# $NFT -I MINIFW-DOCKER-PUB -p tcp --dport "$dstport" -j RETURN
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# done
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#
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# for dstport in $SERVICESUDP1
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# do
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# $NFT -I MINIFW-DOCKER-PUB -p udp --dport "$dstport" -j RETURN
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# done
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#
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# # Privileged services (accessible from privileged & trusted IPs)
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# for dstport in $SERVICESTCP2
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# do
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# for srcip in $PRIVILEGIEDIPS
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# do
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# $NFT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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# done
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#
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# for srcip in $TRUSTEDIPS
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# do
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# $NFT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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# done
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# done
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#
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# for dstport in $SERVICESUDP2
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# do
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# for srcip in $PRIVILEGIEDIPS
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# do
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# $NFT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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# done
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#
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# for srcip in $TRUSTEDIPS
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# do
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# $NFT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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# done
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# done
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#
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# # Trusted services (accessible from trusted IPs)
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# for dstport in $SERVICESTCP3
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# do
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# for srcip in $TRUSTEDIPS
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# do
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# $NFT -I MINIFW-DOCKER-TRUSTED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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# done
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# done
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#
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# for dstport in $SERVICESUDP3
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# do
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# for srcip in $TRUSTEDIPS
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# do
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# $NFT -I MINIFW-DOCKER-TRUSTED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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# done
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# done
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#fi
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#
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## External services
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####################
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# Add set with $DNSSERVERS elements
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$NFT add set inet minifirewall minifirewall_dnsservers { type ipv4_addr\;}
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if [ ! -z $DNSSERVEURS ]
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then
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$NFT add element inet minifirewall minifirewall_dnsservers {$(echo $DNSSERVEURS | sed 's/ /, /g')}
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fi
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# Add set with $HTTPSITES elements
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$NFT add set inet minifirewall minifirewall_httpsites { type ipv4_addr\;}
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if [ ! -z $HTTPSITES ]
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then
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$NFT add element inet minifirewall minifirewall_httpsites {$(echo $HTTPSITES | sed 's/ /, /g')}
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fi
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# Add set with $HTTPSSITES elements
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$NFT add set inet minifirewall minifirewall_httpssites { type ipv4_addr\;}
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if [ ! -z $HTTPSSITES ]
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then
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$NFT add element inet minifirewall minifirewall_httpssites {$(echo $HTTPSSITES | sed 's/ /, /g')}
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fi
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# Add set with $FTPSITES elements
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$NFT add set inet minifirewall minifirewall_ftpsites { type ipv4_addr\;}
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if [ ! -z $FTPSITES ]
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then
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$NFT add element inet minifirewall minifirewall_ftpsites {$(echo $FTPSITES | sed 's/ /, /g')}
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fi
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# Add set with $SSHOK elements
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$NFT add set inet minifirewall minifirewall_sshok { type ipv4_addr\;}
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if [ ! -z $SSHOK ]
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then
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$NFT add element inet minifirewall minifirewall_sshok {$(echo $SSHOK | sed 's/ /, /g')}
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fi
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# Add set with $SMTPOK elements
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$NFT add set inet minifirewall minifirewall_smtpok { type ipv4_addr\;}
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if [ ! -z $SMTPOK ]
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then
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$NFT add element inet minifirewall minifirewall_smtpok {$(echo $SMTPOK | sed 's/ /, /g')}
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fi
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# Add set with $SMTPSECUREOK elements
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$NFT add set inet minifirewall minifirewall_smtpsecureok { type ipv4_addr\;}
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if [ ! -z $SMTPSECUREOK ]
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then
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$NFT add element inet minifirewall minifirewall_smtpsecureok {$(echo $SMTPSECUREOK | sed 's/ /, /g')}
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fi
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# Add set with $NTPOK elements
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$NFT add set inet minifirewall minifirewall_ntpok { type ipv4_addr\;}
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if [ ! -z $NTPOK ]
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then
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$NFT add element inet minifirewall minifirewall_ntpok {$(echo $NTPOK | sed 's/ /, /g')}
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fi
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## DNS authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_dnsservers udp dport 53 counter accept
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_dnsservers tcp dport 53 counter accept
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## HTTP (TCP/80) authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_httpsites tcp dport 80 counter accept
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## HTTPS (TCP/443) authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_httpssites tcp dport 443 counter accept
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## FTP (so complex protocol...) authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_ftpsites tcp dport {20, 21, 1024-65535} counter accept
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## SSH authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_sshok tcp dport 22 counter accept
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## SMTP authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_smtpok tcp dport 25 counter accept
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## secure SMTP (TCP/465 et TCP/587) authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_smtpsecureok tcp dport {465, 587} counter accept
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## NTP authorizations
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$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_ntpok tcp dport 123 counter accept
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trap - INT TERM EXIT
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echo "...starting NFTables rules is now finish : OK"
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exit 0
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