First nftables version of minifirewall
This commit is contained in:
Tristan PILAT
parent
3bcaee5b58
commit
129b323f80
10
README.md
10
README.md
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@ -2,13 +2,15 @@ Minifirewall
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=========
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Minifirewall is shellscripts for easy firewalling on a standalone server
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we used netfilter/iptables http://netfilter.org/ designed for recent Linux kernel
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we used nftables https://wiki.nftables.org/ designed for recent Linux kernel
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See https://gitea.evolix.org/evolix/minifirewall
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## Install
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~~~
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install -m 0700 minifirewall /etc/init.d/minifirewall
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install -m 0700 minifirewall.service /etc/systemd/system/minifirewall.service
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install -m 0700 minifirewall-start.sh /usr/local/sbin/minifirewall-start.sh
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install -m 0700 minifirewall-stop.sh /usr/local/sbin/minifirewall-stop.sh
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install -m 0600 minifirewall.conf /etc/default/minifirewall
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~~~
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@ -17,19 +19,17 @@ install -m 0600 minifirewall.conf /etc/default/minifirewall
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Edit /etc/default/minifirewall file:
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* If your interface is not _eth0_, change *INT* variable
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* If you don't IPv6 : *IPv6=off*
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* Modify *INTLAN* variable, probably with your *IP/32* or your local network if you trust it
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* Set your trusted and privilegied IP addresses in *TRUSTEDIPS* and *PRIVILEGIEDIPS* variables
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* Authorize your +public+ services with *SERVICESTCP1* and *SERVICESUDP1* variables
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* Authorize your +semi-public+ services (only for *TRUSTEDIPS* and *PRIVILEGIEDIPS* ) with *SERVICESTCP2* and *SERVICESUDP2* variables
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* Authorize your +private+ services (only for *TRUSTEDIPS* ) with *SERVICESTCP3* and *SERVICESUDP3* variables
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* Configure your authorizations for external services : DNS, HTTP, HTTPS, SMTP, SSH, NTP
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* Add your specific rules
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## Usage
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~~~
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/etc/init.d/minifirewall start/stop/restart
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systemctl start/stop/restart minifirewall.service
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~~~
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If you want to add minifirewall in boot sequence:
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365
minifirewall-start.sh
Executable file
365
minifirewall-start.sh
Executable file
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@ -0,0 +1,365 @@
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#!/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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#
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## DNS authorizations
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#for x in $DNSSERVEURS
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# do
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# $NFT -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
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# $NFT -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
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# $NFT -A OUTPUT -o $INT -p udp -d $x --dport 53 --match state --state NEW -j ACCEPT
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# done
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#
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## HTTP (TCP/80) authorizations
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#for x in $HTTPSITES
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# do
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# $NFT -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $x -j ACCEPT
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# done
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#
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## HTTPS (TCP/443) authorizations
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#for x in $HTTPSSITES
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# do
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# $NFT -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $x -j ACCEPT
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# done
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#
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## FTP (so complex protocol...) authorizations
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#for x in $FTPSITES
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# do
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# # requests on Control connection
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# $NFT -A INPUT -p tcp ! --syn --sport 21 --dport $PORTSUSER -s $x -j ACCEPT
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# # FTP port-mode on Data Connection
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# $NFT -A INPUT -p tcp --sport 20 --dport $PORTSUSER -s $x -j ACCEPT
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# # FTP passive-mode on Data Connection
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# # WARNING, this allow all connections on TCP ports > 1024
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# $NFT -A INPUT -p tcp ! --syn --sport $PORTSUSER --dport $PORTSUSER -s $x -j ACCEPT
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# done
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#
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## SSH authorizations
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#for x in $SSHOK
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# do
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# $NFT -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
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# done
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#
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## SMTP authorizations
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#for x in $SMTPOK
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# do
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# $NFT -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $x -j ACCEPT
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# done
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#
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## secure SMTP (TCP/465 et TCP/587) authorizations
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#for x in $SMTPSECUREOK
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# do
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# $NFT -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $x -j ACCEPT
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# $NFT -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $x -j ACCEPT
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# done
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#
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## NTP authorizations
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#for x in $NTPOK
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# do
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# $NFT -A INPUT -p udp --sport 123 -s $x -j ACCEPT
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# $NFT -A OUTPUT -o $INT -p udp -d $x --dport 123 --match state --state NEW -j ACCEPT
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# done
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#
|
||||
## Always allow ICMP
|
||||
#$NFT -A INPUT -p icmp -j ACCEPT
|
||||
#[ "$IPV6" != "off" ] && $NFT6 -A INPUT -p icmpv6 -j ACCEPT
|
||||
|
||||
trap - INT TERM EXIT
|
||||
|
||||
echo "...starting NFTables rules is now finish : OK"
|
||||
|
||||
exit 0
|
||||
31
minifirewall-stop.sh
Executable file
31
minifirewall-stop.sh
Executable file
|
|
@ -0,0 +1,31 @@
|
|||
#!/bin/sh
|
||||
|
||||
# minifirewall
|
||||
# See https://gitea.evolix.org/evolix/minifirewall
|
||||
|
||||
# Copyright (c) 2007-2020 Evolix
|
||||
# This program is free software; you can redistribute it and/or
|
||||
# modify it under the terms of the GNU General Public License
|
||||
# as published by the Free Software Foundation; either version 3
|
||||
# of the License.
|
||||
|
||||
# Description
|
||||
# script for standalone server
|
||||
|
||||
# Stop minifirewall
|
||||
#
|
||||
|
||||
# Variables configuration
|
||||
#########################
|
||||
|
||||
# nft path
|
||||
NFT=/usr/sbin/nft
|
||||
|
||||
echo "Flush all rules and accept everything..."
|
||||
|
||||
# Flush everything
|
||||
$NFT flush ruleset
|
||||
|
||||
echo "...flushing IPTables rules is now finish : OK"
|
||||
|
||||
exit 0
|
||||
|
|
@ -1,6 +1,4 @@
|
|||
# Configuration for minifirewall : https://forge.evolix.org/projects/minifirewall
|
||||
# For fun, we keep last change from first CVS repository:
|
||||
# version 0.1 - 12 juillet 2007 $Id: firewall.rc,v 1.2 2007/07/12 19:08:59 reg Exp $
|
||||
|
||||
# Main interface
|
||||
INT='eth0'
|
||||
|
|
@ -21,9 +19,9 @@ INTLAN='192.168.0.2/32'
|
|||
# Trusted IPv4 addresses for private and semi-public services
|
||||
TRUSTEDIPS=''
|
||||
|
||||
# Privilegied IPv4 addresses for semi-public services
|
||||
# Privileged IPv4 addresses for semi-public services
|
||||
# (no need to add again TRUSTEDIPS)
|
||||
PRIVILEGIEDIPS=''
|
||||
PRIVILEGEDIPS=''
|
||||
|
||||
|
||||
# Local services IPv4/IPv6 restrictions
|
||||
|
|
@ -77,27 +75,3 @@ SMTPSECUREOK=''
|
|||
# NTP authorizations
|
||||
NTPOK='0.0.0.0/0'
|
||||
|
||||
|
||||
# IPv6 Specific rules
|
||||
#####################
|
||||
|
||||
# Example: allow input HTTP/HTTPS/SMTP/DNS traffic
|
||||
/sbin/ip6tables -A INPUT -i $INT -p tcp --sport 80 --match state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
/sbin/ip6tables -A INPUT -i $INT -p tcp --sport 443 --match state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
/sbin/ip6tables -A INPUT -i $INT -p tcp --sport 25 --match state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
/sbin/ip6tables -A INPUT -i $INT -p udp --sport 53 --match state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
/sbin/ip6tables -A INPUT -i $INT -p tcp --sport 53 --match state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
|
||||
# Example: allow output DNS, NTP and traceroute traffic
|
||||
/sbin/ip6tables -A OUTPUT -o $INT -p udp --dport 53 --match state --state NEW -j ACCEPT
|
||||
/sbin/ip6tables -A OUTPUT -o $INT -p udp --dport 123 --match state --state NEW -j ACCEPT
|
||||
#/sbin/ip6tables -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
||||
|
||||
# Example: allow DHCPv6
|
||||
/sbin/ip6tables -A INPUT -i $INT -p udp --dport 546 -d fe80::/64 -j ACCEPT
|
||||
/sbin/ip6tables -A OUTPUT -o $INT -p udp --dport 547 -j ACCEPT
|
||||
|
||||
# IPv4 Specific rules
|
||||
#####################
|
||||
|
||||
# /sbin/iptables ...
|
||||
|
|
|
|||
14
minifirewall.service
Normal file
14
minifirewall.service
Normal file
|
|
@ -0,0 +1,14 @@
|
|||
[Unit]
|
||||
Description=minifirewall
|
||||
Documentation=https://gitea.evolix.org/evolix/minifirewall
|
||||
After=default.target
|
||||
|
||||
[Service]
|
||||
Type=oneshot
|
||||
ExecStart=/usr/sbin/minifirewall-start.sh
|
||||
RemainAfterExit=yes
|
||||
ExecStop=/usr/sbin/minifirewall-stop.sh
|
||||
StandardOutput=journal
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target
|
||||
Loading…
Reference in a new issue