408 lines
17 KiB
Bash
Executable File
408 lines
17 KiB
Bash
Executable File
#!/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
|
|
|
|
# Start minifirewall
|
|
#
|
|
|
|
# Variables configuration
|
|
#########################
|
|
|
|
# nft path
|
|
NFT=/usr/sbin/nft
|
|
|
|
# Configuration
|
|
configfile="/etc/default/minifirewall"
|
|
|
|
DOCKER=$(grep "DOCKER=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
|
|
INT=$(grep "INT=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
|
|
|
|
# sysctl network security settings
|
|
##################################
|
|
|
|
# Don't answer to broadcast pings
|
|
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
|
|
|
|
# Ignore bogus ICMP responses
|
|
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
|
|
|
|
# Disable Source Routing
|
|
for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do
|
|
echo 0 > $i
|
|
done
|
|
|
|
# Enable TCP SYN cookies to avoid TCP-SYN-FLOOD attacks
|
|
# cf http://cr.yp.to/syncookies.html
|
|
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
|
|
|
|
# Disable ICMP redirects
|
|
for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do
|
|
echo 0 > $i
|
|
done
|
|
|
|
for i in /proc/sys/net/ipv4/conf/*/send_redirects; do
|
|
echo 0 > $i
|
|
done
|
|
|
|
# Enable Reverse Path filtering : verify if responses use same network interface
|
|
for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
|
|
echo 1 > $i
|
|
done
|
|
|
|
# log des paquets avec adresse incoherente
|
|
for i in /proc/sys/net/ipv4/conf/*/log_martians; do
|
|
echo 1 > $i
|
|
done
|
|
|
|
############
|
|
## FUNCTIONS
|
|
############
|
|
|
|
# Determine IP type
|
|
ip_type() {
|
|
v4_ips=""
|
|
v6_ips=""
|
|
for ip in $(echo $1 | sed 's/ /, /g'); do
|
|
if [ "$ip" != "${ip#*[0-9].[0-9]}" ]; then
|
|
v4_ips="$v4_ips$ip "
|
|
elif [ "$ip" != "${ip#*:[0-9a-fA-F]}" ]; then
|
|
v6_ips="$v6_ips$ip "
|
|
else
|
|
echo "Unrecognized IP format '$ip'"
|
|
exit 1
|
|
fi
|
|
done
|
|
}
|
|
|
|
#########################
|
|
## NFTables configuration
|
|
#########################
|
|
|
|
if ! test -f $configfile; then
|
|
echo "$configfile does not exist" >&2
|
|
exit 1
|
|
fi
|
|
|
|
# Parse configuration file
|
|
. $configfile
|
|
|
|
# Flush everything first
|
|
$NFT flush ruleset
|
|
|
|
# Add a filter table
|
|
$NFT add table inet minifirewall
|
|
|
|
# Add the input, forward, and output base chains. The default policy will be to drop the traffic.
|
|
$NFT add chain inet minifirewall minifirewall_input '{ type filter hook input priority 0 ; policy drop ; }'
|
|
$NFT add chain inet minifirewall minifirewall_forward '{ type filter hook forward priority 0 ; policy drop ; }'
|
|
$NFT add chain inet minifirewall minifirewall_output '{ type filter hook output priority 0 ; policy drop ; }'
|
|
|
|
# Add set with trusted IP addresses
|
|
$NFT add set inet minifirewall minifirewall_trusted_v4_ips '{ type ipv4_addr ; flags interval ;}'
|
|
$NFT add set inet minifirewall minifirewall_trusted_v6_ips '{ type ipv6_addr ; flags interval ;}'
|
|
|
|
ip_type "$TRUSTEDIPS"
|
|
|
|
if [ -n "$v4_ips" ] ; then
|
|
$NFT add element inet minifirewall minifirewall_trusted_v4_ips {$v4_ips}
|
|
fi
|
|
if [ -n "$v6_ips" ] ; then
|
|
$NFT add element inet minifirewall minifirewall_trusted_v6_ips {$v6_ips}
|
|
fi
|
|
|
|
# Add set with privileged IP addresses
|
|
$NFT add set inet minifirewall minifirewall_privileged_v4_ips '{ type ipv4_addr ; flags interval ;}'
|
|
$NFT add set inet minifirewall minifirewall_privileged_v6_ips '{ type ipv6_addr ; flags interval ;}'
|
|
|
|
ip_type "$PRIVILEGIEDIPS"
|
|
|
|
if [ -n "$v4_ips" ] ; then
|
|
$NFT add element inet minifirewall minifirewall_privileged_v4_ips {$v4_ips}
|
|
fi
|
|
if [ -n "$v6_ips" ] ; then
|
|
$NFT add element inet minifirewall minifirewall_privileged_v6_ips {$v6_ips}
|
|
fi
|
|
|
|
# Add set for blocked IP addresses
|
|
$NFT add set inet minifirewall minifirewall_blocked_v4_ips '{ type ipv4_addr ; flags interval ;}'
|
|
$NFT add set inet minifirewall minifirewall_blocked_v6_ips '{ type ipv6_addr ; flags interval ;}'
|
|
|
|
# Add TCP/UDP chains for protected, public, semi-public and private ports
|
|
$NFT add chain inet minifirewall protected_tcp_ports
|
|
$NFT add chain inet minifirewall protected_udp_ports
|
|
$NFT add chain inet minifirewall public_tcp_ports
|
|
$NFT add chain inet minifirewall public_udp_ports
|
|
$NFT add chain inet minifirewall semipublic_tcp_ports
|
|
$NFT add chain inet minifirewall semipublic_udp_ports
|
|
$NFT add chain inet minifirewall private_tcp_ports
|
|
$NFT add chain inet minifirewall private_udp_ports
|
|
|
|
################
|
|
## Input traffic
|
|
################
|
|
|
|
# Related and established traffic is accepted
|
|
$NFT add rule inet minifirewall minifirewall_input ct state related,established accept
|
|
|
|
# All loopback interface traffic is accepted
|
|
$NFT add rule inet minifirewall minifirewall_input iif lo accept
|
|
|
|
# Allow services for $INTLAN (local server or local network) is accepted
|
|
$NFT add rule inet minifirewall minifirewall_input ip saddr $INTLAN accept
|
|
|
|
# Any invalid traffic is dropped
|
|
$NFT add rule inet minifirewall minifirewall_input ct state invalid drop
|
|
|
|
# ICMP and IGMP traffic is accepted
|
|
$NFT add rule inet minifirewall minifirewall_input ip protocol icmp accept
|
|
$NFT add rule inet minifirewall minifirewall_input meta l4proto ipv6-icmp accept
|
|
$NFT add rule inet minifirewall minifirewall_input ip protocol igmp accept
|
|
|
|
# New UDP traffic from blocked IPs jumps to the private_udp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_blocked_v4_ips meta l4proto udp ct state new jump protected_udp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_blocked_v6_ips meta l4proto udp ct state new jump protected_udp_ports'
|
|
|
|
# New TCP traffic from blocked IPs jumps to the private_tcp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_blocked_v4_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump protected_tcp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_blocked_v6_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump protected_tcp_ports'
|
|
|
|
# New UDP traffic from trusted IPs jumps to the private_udp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_v4_ips meta l4proto udp ct state new jump private_udp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_trusted_v6_ips meta l4proto udp ct state new jump private_udp_ports'
|
|
|
|
# New TCP traffic from trusted IPs jumps to the private_tcp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_v4_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump private_tcp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_trusted_v6_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump private_tcp_ports'
|
|
|
|
# New UDP traffic from trusted IPs and privileged IPs jumps to the semipublic_udp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_privileged_v4_ips meta l4proto udp ct state new jump semipublic_udp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_privileged_v6_ips meta l4proto udp ct state new jump semipublic_udp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_v4_ips meta l4proto udp ct state new jump semipublic_udp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_trusted_v6_ips meta l4proto udp ct state new jump semipublic_udp_ports'
|
|
|
|
# New TCP traffic from trusted IPs and privileged IPs jumps to the semipublic_tcp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_privileged_v4_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump semipublic_tcp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_privileged_v6_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump semipublic_tcp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip saddr @minifirewall_trusted_v4_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump semipublic_tcp_ports'
|
|
$NFT add rule inet minifirewall minifirewall_input 'ip6 saddr @minifirewall_trusted_v6_ips meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump semipublic_tcp_ports'
|
|
|
|
# New UDP traffic from any other IP jumps to the public_udp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'meta l4proto udp ct state new jump public_udp_ports'
|
|
|
|
# New TCP traffic from any other IP jumps to the public_tcp_ports chain
|
|
$NFT add rule inet minifirewall minifirewall_input 'meta l4proto tcp tcp flags & (fin|syn|rst|ack) == syn ct state new jump public_tcp_ports'
|
|
|
|
# Reject all traffic that was not processed by other rules
|
|
$NFT add rule inet minifirewall minifirewall_input meta l4proto udp reject
|
|
$NFT add rule inet minifirewall minifirewall_input meta l4proto tcp reject with tcp reset
|
|
|
|
# Feed public_tcp_ports chain with public TCP ports
|
|
for x in $SERVICESTCP1
|
|
do
|
|
$NFT add rule inet minifirewall public_tcp_ports tcp dport $x accept
|
|
done
|
|
|
|
# Feed public_udp_ports chain with public UDP ports
|
|
for x in $SERVICESUDP1
|
|
do
|
|
$NFT add rule inet minifirewall public_tcp_ports udp dport $x accept
|
|
done
|
|
|
|
# Feed semipublic_tcp_ports chain with semi-public TCP ports
|
|
for x in $SERVICESTCP2
|
|
do
|
|
$NFT add rule inet minifirewall semipublic_tcp_ports tcp dport $x accept
|
|
done
|
|
|
|
# Feed semipublic_udp_ports chain with semi-public UDP ports
|
|
for x in $SERVICESUDP2
|
|
do
|
|
$NFT add rule inet minifirewall semipublic_udp_ports udp dport $x accept
|
|
done
|
|
|
|
# Feed private_tcp_ports chain with private TCP ports
|
|
for x in $SERVICESTCP3
|
|
do
|
|
$NFT add rule inet minifirewall private_tcp_ports tcp dport $x accept
|
|
done
|
|
|
|
# Feed private_udp_ports chain with private UDP ports
|
|
for x in $SERVICESUDP3
|
|
do
|
|
$NFT add rule inet minifirewall private_udp_ports udp dport $x accept
|
|
done
|
|
|
|
# Feed protected_tcp_ports chain with protected TCP ports
|
|
for x in $SERVICESTCP1p
|
|
do
|
|
$NFT add rule inet minifirewall protected_tcp_ports tcp dport $x drop
|
|
done
|
|
|
|
# Feed protected_udp_ports chain with protected UDP ports
|
|
for x in $SERVICESUDP1p
|
|
do
|
|
$NFT add rule inet minifirewall protected_udp_ports udp dport $x drop
|
|
done
|
|
|
|
#####################################
|
|
## Output traffic / external services
|
|
#####################################
|
|
|
|
# Add set with $DNSSERVERS elements
|
|
$NFT add set inet minifirewall minifirewall_dnsservers { type ipv4_addr\;}
|
|
if [ ! -z $DNSSERVEURS ]
|
|
then
|
|
if echo $DNSSERVEURS | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP/UDP port 53
|
|
$NFT add rule inet minifirewall minifirewall_output udp dport 53 counter accept
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport 53 counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_dnsservers set and allow this set to be reached on TCP/UDP port 53
|
|
$NFT add element inet minifirewall minifirewall_dnsservers {$(echo $DNSSERVEURS | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_dnsservers udp dport 53 counter accept
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_dnsservers tcp dport 53 counter accept
|
|
fi
|
|
fi
|
|
|
|
# Add set with $HTTPSITES elements
|
|
$NFT add set inet minifirewall minifirewall_httpsites { type ipv4_addr\;}
|
|
if [ ! -z $HTTPSITES ]
|
|
then
|
|
if echo $HTTPSITES | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP port 80
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport 80 counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_httpsites set and allow this set to be reach on TCP port 80
|
|
$NFT add element inet minifirewall minifirewall_httpsites {$(echo $HTTPSITES | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_httpsites tcp dport 80 counter accept
|
|
fi
|
|
fi
|
|
|
|
# Add set with $HTTPSSITES elements
|
|
$NFT add set inet minifirewall minifirewall_httpssites { type ipv4_addr\;}
|
|
if [ ! -z $HTTPSSITES ]
|
|
then
|
|
if echo $HTTPSSITES | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP port 443
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport 443 counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_httpssites set and allow this set to be reach on TCP port 443
|
|
$NFT add element inet minifirewall minifirewall_httpssites {$(echo $HTTPSSITES | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_httpssites tcp dport 443 counter accept
|
|
fi
|
|
fi
|
|
|
|
# Add set with $FTPSITES elements
|
|
$NFT add set inet minifirewall minifirewall_ftpsites { type ipv4_addr\;}
|
|
if [ ! -z $FTPSITES ]
|
|
then
|
|
if echo $FTPSITES | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP ports 20, 21, 1024-65535
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport {20, 21, 1024-65535} counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_ftpsites set and allow this set to be reach on TCP ports 20, 21, 1024-65535
|
|
$NFT add element inet minifirewall minifirewall_ftpsites {$(echo $FTPSITES | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_ftpsites tcp dport {20, 21, 1024-65535} counter accept
|
|
fi
|
|
fi
|
|
|
|
# Add set with $SSHOK elements
|
|
$NFT add set inet minifirewall minifirewall_sshok { type ipv4_addr\;}
|
|
if [ ! -z $SSHOK ]
|
|
then
|
|
if echo $SSHOK | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP port 22
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport 22 counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_sshok set and allow this set to be reach on TCP port 22
|
|
$NFT add element inet minifirewall minifirewall_sshok {$(echo $SSHOK | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_sshok tcp dport 22 counter accept
|
|
fi
|
|
fi
|
|
|
|
# Add set with $SMTPOK elements
|
|
$NFT add set inet minifirewall minifirewall_smtpok { type ipv4_addr\;}
|
|
if [ ! -z $SMTPOK ]
|
|
then
|
|
if echo $SMTPOK | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP port 25
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport 25 counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_smtpok set and allow this set to be reach on TCP port 25
|
|
$NFT add element inet minifirewall minifirewall_smtpok {$(echo $SMTPOK | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_smtpok tcp dport 25 counter accept
|
|
fi
|
|
fi
|
|
|
|
# Add set with $SMTPSECUREOK elements
|
|
$NFT add set inet minifirewall minifirewall_smtpsecureok { type ipv4_addr\;}
|
|
if [ ! -z $SMTPSECUREOK ]
|
|
then
|
|
if echo $SMTPSECUREOK | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP ports 465 and 587
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport {465, 587} counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_smtpsecureok set and allow this set to be reach on TCP ports 465 and 587
|
|
$NFT add element inet minifirewall minifirewall_smtpsecureok {$(echo $SMTPSECUREOK | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_smtpsecureok tcp dport {465, 587} counter accept
|
|
fi
|
|
fi
|
|
|
|
# Add set with $NTPOK elements
|
|
$NFT add set inet minifirewall minifirewall_ntpok { type ipv4_addr\;}
|
|
if [ ! -z $NTPOK ]
|
|
then
|
|
if echo $NTPOK | grep -q "0.0.0.0/0"
|
|
then
|
|
# If 0.0.0.0/0 is present we allow any output on TCP ports 123
|
|
$NFT add rule inet minifirewall minifirewall_output tcp dport 123 counter accept
|
|
else
|
|
# Else we add each element to the minifirewall_smtpsecureok set and allow this set to be reach on TCP port 123
|
|
$NFT add element inet minifirewall minifirewall_ntpok {$(echo $NTPOK | sed 's/ /, /g')}
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr @minifirewall_ntpok tcp dport 123 counter accept
|
|
fi
|
|
fi
|
|
|
|
# If specified, we add per host output autorisation
|
|
if [ -n $OUTPUTOK ]
|
|
then
|
|
for item in $(echo $OUTPUTOK)
|
|
do
|
|
ip=$(echo $item | awk -F'!' '{print $1}')
|
|
port=$(echo $item | awk -F'!' '{print $2}')
|
|
$NFT add rule inet minifirewall minifirewall_output ip daddr $ip tcp dport $port counter accept
|
|
done
|
|
fi
|
|
|
|
# Related and established traffic is accepted
|
|
$NFT add rule inet minifirewall minifirewall_output ct state established,related accept
|
|
|
|
# ICMP and IGMP traffic is accepted
|
|
$NFT add rule inet minifirewall minifirewall_output ip protocol icmp accept
|
|
$NFT add rule inet minifirewall minifirewall_output meta l4proto ipv6-icmp accept
|
|
$NFT add rule inet minifirewall minifirewall_output ip protocol igmp accept
|
|
|
|
trap - INT TERM EXIT
|
|
|
|
echo "...starting NFTables rules is now finish : OK"
|
|
|
|
exit 0
|
|
|