2022-03-15 23:07:33 +01:00
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#!/bin/sh
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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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# See https://gitea.evolix.org/evolix/minifirewall
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# Copyright (c) 2007-2022 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 or stop minifirewall
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#
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### BEGIN INIT INFO
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# Provides: minifirewall
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# Required-Start:
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# Required-Stop:
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# Should-Start: $network $syslog $named
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# Should-Stop: $syslog
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: start and stop the firewall
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# Description: Firewall designed for standalone server
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### END INIT INFO
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2022-03-21 14:35:20 +01:00
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VERSION="22.03.3"
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2022-03-15 23:07:33 +01:00
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NAME="minifirewall"
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2022-03-16 23:49:34 +01:00
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# shellcheck disable=SC2034
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2022-03-15 23:07:33 +01:00
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DESC="Firewall designed for standalone server"
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set -u
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# Variables configuration
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#########################
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config_file="/etc/default/minifirewall"
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includes_dir="/etc/minifirewall.d"
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# iptables paths
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IPT=$(command -v iptables)
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if [ -z "${IPT}" ]; then
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echo "Unable to find 'iptables\` command in PATH." >&2
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exit 1
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fi
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IPT6=$(command -v ip6tables)
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if [ -z "${IPT6}" ]; then
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echo "Unable to find 'ip6tables\` command in PATH." >&2
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exit 1
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fi
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# TCP/IP variables
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LOOPBACK='127.0.0.0/8'
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CLASSA='10.0.0.0/8'
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CLASSB='172.16.0.0/12'
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CLASSC='192.168.0.0/16'
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CLASSD='224.0.0.0/4'
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CLASSE='240.0.0.0/5'
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ALL='0.0.0.0'
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BROAD='255.255.255.255'
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PORTSROOT='0:1023'
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PORTSUSER='1024:65535'
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# Configuration
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INT=''
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IPV6=''
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DOCKER=''
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INTLAN=''
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TRUSTEDIPS=''
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PRIVILEGIEDIPS=''
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SERVICESTCP1p=''
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SERVICESUDP1p=''
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SERVICESTCP1=''
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SERVICESUDP1=''
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SERVICESTCP2=''
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SERVICESUDP2=''
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SERVICESTCP3=''
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SERVICESUDP3=''
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DNSSERVEURS=''
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HTTPSITES=''
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HTTPSSITES=''
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FTPSITES=''
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SSHOK=''
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SMTPOK=''
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SMTPSECUREOK=''
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NTPOK=''
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PROXY=''
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PROXYBYPASS=''
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PROXYPORT=''
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BACKUPSERVERS=''
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LEGACY_CONFIG='off'
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is_ipv6_enabled() {
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test "${IPV6}" != "off"
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}
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is_docker_enabled() {
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test "${DOCKER}" = "on"
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}
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is_proxy_enabled() {
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test "${PROXY}" = "on"
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}
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is_ipv6() {
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echo "$1" | grep -q ':'
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}
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is_legacy_config() {
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test "${LEGACY_CONFIG}" != "off"
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}
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chain_exists() {
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chain_name="$1"
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if [ $# -ge 2 ]; then
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intable="--table $2"
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2022-03-16 23:49:34 +01:00
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else
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intable=""
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2022-03-15 23:07:33 +01:00
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fi
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# shellcheck disable=SC2086
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iptables ${intable} -nL "${chain_name}" >/dev/null 2>&1
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}
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source_file_or_error() {
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file=$1
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echo "...sourcing '${file}\`"
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tmpfile=$(mktemp --tmpdir=/tmp minifirewall.XXX)
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. "${file}" 2>"${tmpfile}" >&2
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if [ -s "${tmpfile}" ]; then
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echo "${file} returns standard or error output (see below). Stopping." >&2
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cat "${tmpfile}"
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exit 1
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fi
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rm "${tmpfile}"
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}
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source_configuration() {
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if ! test -f ${config_file}; then
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echo "${config_file} does not exist" >&2
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## We still want to deal with this really old configuration file
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## even if it has been deprecated since Debian 8
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old_config_file="/etc/firewall.rc"
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if test -f ${old_config_file}; then
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echo "${old_config_file} is deprecated. Rename it to ${config_file}" >&2
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fi
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exit 1
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fi
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if grep -e "iptables" -e "ip6tables" "${config_file}" | grep -qvE "^#"; then
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# Backward compatible mode
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###########################
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echo "Legacy config detected"
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LEGACY_CONFIG='on'
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# Non-backward compatible mode
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###############################
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# If we ever want to remove the backward compatible mode
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# we can remove the two lines above and uncomment the lines below.
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# They break if any iptables/ip6tables command is found in the configuration file
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# echo "iptables/ip6tables commands found in ${config_file}." >&2
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# echo "Move them in included files (in ${includes_dir})." >&2
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# exit 1
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fi
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if is_legacy_config; then
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# In this mode, we extract all variable definitions
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# to a temporary file that we can source.
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# It allow iptables/ip6tables commands to remain in the configuration file
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# and not interfere with the configuration step.
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tmp_config_file=$(mktemp --tmpdir=/tmp minifirewall.XXX)
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grep -E "^\s*[_a-zA-Z0-9]+=" "${config_file}" > "${tmp_config_file}"
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source_file_or_error "${tmp_config_file}"
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rm "${tmp_config_file}"
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else
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source_file_or_error "${config_file}"
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fi
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}
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source_includes() {
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if [ -d "${includes_dir}" ]; then
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include_files=$(find ${includes_dir} -type f -readable -not -name '*.*' | sort -h)
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for include_file in ${include_files}; do
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source_file_or_error "${include_file}"
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done
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fi
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}
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start() {
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echo "Start IPTables rules..."
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# Stop and warn if error!
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set -e
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trap 'echo "ERROR in minifirewall configuration (fix it now!) or script manipulation (fix yourself)." ' INT TERM EXIT
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# sysctl network security settings
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##################################
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# Set 1 to ignore broadcast pings (default)
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: "${SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS:=1}"
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# Set 1 to ignore bogus ICMP responses (default)
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: "${SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES:=1}"
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# Set 0 to disable source routing (default)
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: "${SYSCTL_ACCEPT_SOURCE_ROUTE:=0}"
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# Set 1 to enable TCP SYN cookies (default)
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# cf http://cr.yp.to/syncookies.html
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: "${SYSCTL_TCP_SYNCOOKIES:=1}"
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# Set 0 to disable ICMP redirects (default)
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: "${SYSCTL_ICMP_REDIRECTS:=0}"
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# Set 1 to enable Reverse Path filtering (default)
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# Set 0 if VRRP is used
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: "${SYSCTL_RP_FILTER:=1}"
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# Set 1 to log packets with inconsistent address (default)
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: "${SYSCTL_LOG_MARTIANS:=1}"
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if [ "${SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS}" = "1" ] || [ "${SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS}" = "0" ]; then
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echo "${SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS}" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
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else
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echo "Invalid SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS value '${SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS}', must be '0' or '1'." >&2
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exit 1
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fi
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if [ "${SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES}" = "1" ] || [ "${SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES}" = "0" ]; then
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echo "${SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES}" > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
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else
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echo "Invalid SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES value '${SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES}', must be '0' or '1'." >&2
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exit 1
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fi
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if [ "${SYSCTL_ACCEPT_SOURCE_ROUTE}" = "1" ] || [ "${SYSCTL_ACCEPT_SOURCE_ROUTE}" = "0" ]; then
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for proc_sys_file in /proc/sys/net/ipv4/conf/*/accept_source_route; do
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echo "${SYSCTL_ACCEPT_SOURCE_ROUTE}" = > "${proc_sys_file}"
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done
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else
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echo "Invalid SYSCTL_ACCEPT_SOURCE_ROUTE value '${SYSCTL_ACCEPT_SOURCE_ROUTE}', must be '0' or '1'." >&2
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exit 1
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fi
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if [ "${SYSCTL_TCP_SYNCOOKIES}" = "1" ] || [ "${SYSCTL_TCP_SYNCOOKIES}" = "0" ]; then
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echo "${SYSCTL_TCP_SYNCOOKIES}" > /proc/sys/net/ipv4/tcp_syncookies
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else
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echo "Invalid SYSCTL_TCP_SYNCOOKIES value '${SYSCTL_TCP_SYNCOOKIES}', must be '0' or '1'." >&2
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exit 1
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fi
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if [ "${SYSCTL_ICMP_REDIRECTS}" = "1" ] || [ "${SYSCTL_ICMP_REDIRECTS}" = "0" ]; then
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for proc_sys_file in /proc/sys/net/ipv4/conf/*/accept_redirects; do
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echo "${SYSCTL_ICMP_REDIRECTS}" > "${proc_sys_file}"
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done
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for proc_sys_file in /proc/sys/net/ipv4/conf/*/send_redirects; do
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echo "${SYSCTL_ICMP_REDIRECTS}" > "${proc_sys_file}"
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done
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else
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echo "Invalid SYSCTL_ICMP_REDIRECTS value '${SYSCTL_ICMP_REDIRECTS}', must be '0' or '1'." >&2
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exit 1
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fi
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if [ "${SYSCTL_RP_FILTER}" = "1" ] || [ "${SYSCTL_RP_FILTER}" = "0" ]; then
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for proc_sys_file in /proc/sys/net/ipv4/conf/*/rp_filter; do
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echo "${SYSCTL_RP_FILTER}" > "${proc_sys_file}"
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done
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else
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echo "Invalid SYSCTL_RP_FILTER value '${SYSCTL_RP_FILTER}', must be '0' or '1'." >&2
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exit 1
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fi
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if [ "${SYSCTL_LOG_MARTIANS}" = "1" ] || [ "${SYSCTL_LOG_MARTIANS}" = "0" ]; then
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for proc_sys_file in /proc/sys/net/ipv4/conf/*/log_martians; do
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echo "${SYSCTL_LOG_MARTIANS}" > "${proc_sys_file}"
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done
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else
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echo "Invalid SYSCTL_LOG_MARTIANS value '${SYSCTL_LOG_MARTIANS}', must be '0' or '1'." >&2
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exit 1
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fi
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# IPTables configuration
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########################
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${IPT} -N LOG_DROP
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${IPT} -A LOG_DROP -j LOG --log-prefix '[IPTABLES DROP] : '
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${IPT} -A LOG_DROP -j DROP
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${IPT} -N LOG_ACCEPT
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${IPT} -A LOG_ACCEPT -j LOG --log-prefix '[IPTABLES ACCEPT] : '
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${IPT} -A LOG_ACCEPT -j ACCEPT
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if is_ipv6_enabled; then
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${IPT6} -N LOG_DROP
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${IPT6} -A LOG_DROP -j LOG --log-prefix '[IPTABLES DROP] : '
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${IPT6} -A LOG_DROP -j DROP
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${IPT6} -N LOG_ACCEPT
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${IPT6} -A LOG_ACCEPT -j LOG --log-prefix '[IPTABLES ACCEPT] : '
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${IPT6} -A LOG_ACCEPT -j ACCEPT
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fi
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2022-03-21 14:35:20 +01:00
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# Source additional rules and commands
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# * from legacy configuration file (/etc/default/minifirewall)
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# * from configuration directory (/etc/minifirewall.d/*)
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source_includes
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2022-03-15 23:07:33 +01:00
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# Trusted ip addresses
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${IPT} -N ONLYTRUSTED
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${IPT} -A ONLYTRUSTED -j LOG_DROP
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if is_ipv6_enabled; then
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${IPT6} -N ONLYTRUSTED
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${IPT6} -A ONLYTRUSTED -j LOG_DROP
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fi
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for ip in ${TRUSTEDIPS}; do
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if is_ipv6 ${ip}; then
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if is_ipv6_enabled; then
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${IPT6} -I ONLYTRUSTED -s ${ip} -j ACCEPT
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fi
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else
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${IPT} -I ONLYTRUSTED -s ${ip} -j ACCEPT
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fi
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done
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# Privilegied ip addresses
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# (trusted ip addresses *are* privilegied)
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${IPT} -N ONLYPRIVILEGIED
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${IPT} -A ONLYPRIVILEGIED -j ONLYTRUSTED
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if is_ipv6_enabled; then
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${IPT6} -N ONLYPRIVILEGIED
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${IPT6} -A ONLYPRIVILEGIED -j ONLYTRUSTED
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fi
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for ip in ${PRIVILEGIEDIPS}; do
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if is_ipv6 ${ip}; then
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if is_ipv6_enabled; then
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${IPT6} -I ONLYPRIVILEGIED -s ${ip} -j ACCEPT
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fi
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else
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${IPT} -I ONLYPRIVILEGIED -s ${ip} -j ACCEPT
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fi
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done
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# Chain for restrictions (blacklist IPs/ranges)
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${IPT} -N NEEDRESTRICT
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if is_ipv6_enabled; then
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${IPT6} -N NEEDRESTRICT
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fi
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# We allow all on loopback interface
|
|
|
|
${IPT} -A INPUT -i lo -j ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -i lo -j ACCEPT
|
|
|
|
fi
|
|
|
|
# if OUTPUTDROP
|
|
|
|
${IPT} -A OUTPUT -o lo -j ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A OUTPUT -o lo -j ACCEPT
|
|
|
|
fi
|
|
|
|
|
|
|
|
# We avoid "martians" packets, typical when W32/Blaster virus
|
|
|
|
# attacked windowsupdate.com and DNS was changed to 127.0.0.1
|
|
|
|
# ${IPT} -t NAT -I PREROUTING -s ${LOOPBACK} -i ! lo -j DROP
|
|
|
|
for IP in ${LOOPBACK}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -s ${IP} ! -i lo -j DROP
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -s ${IP} ! -i lo -j DROP
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
if is_docker_enabled; then
|
|
|
|
# WARN: IPv6 not yet supported for Docker rules
|
|
|
|
${IPT} -N MINIFW-DOCKER-TRUSTED
|
|
|
|
${IPT} -A MINIFW-DOCKER-TRUSTED -j DROP
|
|
|
|
|
|
|
|
${IPT} -N MINIFW-DOCKER-PRIVILEGED
|
|
|
|
${IPT} -A MINIFW-DOCKER-PRIVILEGED -j MINIFW-DOCKER-TRUSTED
|
|
|
|
${IPT} -A MINIFW-DOCKER-PRIVILEGED -j RETURN
|
|
|
|
|
|
|
|
${IPT} -N MINIFW-DOCKER-PUB
|
|
|
|
${IPT} -A MINIFW-DOCKER-PUB -j MINIFW-DOCKER-PRIVILEGED
|
|
|
|
${IPT} -A MINIFW-DOCKER-PUB -j RETURN
|
|
|
|
|
|
|
|
# Flush DOCKER-USER if exist, create it if absent
|
|
|
|
if chain_exists 'DOCKER-USER'; then
|
|
|
|
${IPT} -F DOCKER-USER
|
|
|
|
else
|
|
|
|
${IPT} -N DOCKER-USER
|
|
|
|
fi;
|
|
|
|
|
|
|
|
# Pipe new connection through MINIFW-DOCKER-PUB
|
|
|
|
${IPT} -A DOCKER-USER -i ${INT} -m state --state NEW -j MINIFW-DOCKER-PUB
|
|
|
|
${IPT} -A DOCKER-USER -j RETURN
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
|
|
# Local services restrictions
|
|
|
|
#############################
|
|
|
|
|
|
|
|
# Allow services for ${INTLAN} (local server or local network)
|
|
|
|
for IP in ${INTLAN}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# Enable protection chain for sensible services
|
|
|
|
for port in ${SERVICESTCP1p}; do
|
|
|
|
${IPT} -A INPUT -p tcp --dport ${port} -j NEEDRESTRICT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp --dport ${port} -j NEEDRESTRICT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
for port in ${SERVICESUDP1p}; do
|
|
|
|
${IPT} -A INPUT -p udp --dport ${port} -j NEEDRESTRICT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p udp --dport ${port} -j NEEDRESTRICT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# Public service
|
|
|
|
for port in ${SERVICESTCP1}; do
|
|
|
|
${IPT} -A INPUT -p tcp --dport ${port} -j ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp --dport ${port} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
for port in ${SERVICESUDP1}; do
|
|
|
|
${IPT} -A INPUT -p udp --dport ${port} -j ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p udp --dport ${port} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# Privilegied services
|
|
|
|
for port in ${SERVICESTCP2}; do
|
|
|
|
${IPT} -A INPUT -p tcp --dport ${port} -j ONLYPRIVILEGIED
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp --dport ${port} -j ONLYPRIVILEGIED
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
for port in ${SERVICESUDP2}; do
|
|
|
|
${IPT} -A INPUT -p udp --dport ${port} -j ONLYPRIVILEGIED
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p udp --dport ${port} -j ONLYPRIVILEGIED
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# Private services
|
|
|
|
for port in ${SERVICESTCP3}; do
|
|
|
|
${IPT} -A INPUT -p tcp --dport ${port} -j ONLYTRUSTED
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp --dport ${port} -j ONLYTRUSTED
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
for port in ${SERVICESUDP3}; do
|
|
|
|
${IPT} -A INPUT -p udp --dport ${port} -j ONLYTRUSTED
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p udp --dport ${port} -j ONLYTRUSTED
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
|
|
|
|
if is_docker_enabled; then
|
|
|
|
# WARN: IPv6 not yet supported
|
|
|
|
|
|
|
|
# Public services defined in SERVICESTCP1 & SERVICESUDP1
|
|
|
|
for dstport in ${SERVICESTCP1}; do
|
|
|
|
${IPT} -I MINIFW-DOCKER-PUB -p tcp --dport "${dstport}" -j RETURN
|
|
|
|
done
|
|
|
|
|
|
|
|
for dstport in ${SERVICESUDP1}; do
|
|
|
|
${IPT} -I MINIFW-DOCKER-PUB -p udp --dport "${dstport}" -j RETURN
|
|
|
|
done
|
|
|
|
|
|
|
|
# Privileged services (accessible from privileged & trusted IPs)
|
|
|
|
for dstport in ${SERVICESTCP2}; do
|
|
|
|
for srcip in ${PRIVILEGIEDIPS}; do
|
2022-03-16 23:49:34 +01:00
|
|
|
if ! is_ipv6 ${srcip}; then
|
|
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
|
|
fi
|
2022-03-15 23:07:33 +01:00
|
|
|
done
|
|
|
|
|
|
|
|
for srcip in ${TRUSTEDIPS}; do
|
2022-03-16 23:49:34 +01:00
|
|
|
if ! is_ipv6 ${srcip}; then
|
|
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
|
|
fi
|
2022-03-15 23:07:33 +01:00
|
|
|
done
|
|
|
|
done
|
|
|
|
|
|
|
|
for dstport in ${SERVICESUDP2}; do
|
|
|
|
for srcip in ${PRIVILEGIEDIPS}; do
|
2022-03-16 23:49:34 +01:00
|
|
|
if ! is_ipv6 ${srcip}; then
|
|
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p udp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
|
|
fi
|
2022-03-15 23:07:33 +01:00
|
|
|
done
|
|
|
|
|
|
|
|
for srcip in ${TRUSTEDIPS}; do
|
2022-03-16 23:49:34 +01:00
|
|
|
if ! is_ipv6 ${srcip}; then
|
|
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p udp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
|
|
fi
|
2022-03-15 23:07:33 +01:00
|
|
|
done
|
|
|
|
done
|
|
|
|
|
|
|
|
# Trusted services (accessible from trusted IPs)
|
|
|
|
for dstport in ${SERVICESTCP3}; do
|
|
|
|
for srcip in ${TRUSTEDIPS}; do
|
2022-03-16 23:49:34 +01:00
|
|
|
if ! is_ipv6 ${srcip}; then
|
|
|
|
${IPT} -I MINIFW-DOCKER-TRUSTED -p tcp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
|
|
fi
|
2022-03-15 23:07:33 +01:00
|
|
|
done
|
|
|
|
done
|
|
|
|
|
|
|
|
for dstport in ${SERVICESUDP3}; do
|
|
|
|
for srcip in ${TRUSTEDIPS}; do
|
2022-03-16 23:49:34 +01:00
|
|
|
if ! is_ipv6 ${srcip}; then
|
|
|
|
${IPT} -I MINIFW-DOCKER-TRUSTED -p udp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
|
|
fi
|
2022-03-15 23:07:33 +01:00
|
|
|
done
|
|
|
|
done
|
|
|
|
fi
|
|
|
|
|
|
|
|
# External services
|
|
|
|
###################
|
|
|
|
|
|
|
|
# DNS authorizations
|
|
|
|
for IP in ${DNSSERVEURS}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 53 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
${IPT6} -A INPUT -p udp --sport 53 --dport ${PORTSUSER} -s ${IP} -m state --state ESTABLISHED,RELATED -j ACCEPT
|
|
|
|
${IPT6} -A OUTPUT -o ${INT} -p udp -d ${IP} --dport 53 --match state --state NEW -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 53 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
${IPT} -A INPUT -p udp --sport 53 --dport ${PORTSUSER} -s ${IP} -m state --state ESTABLISHED,RELATED -j ACCEPT
|
|
|
|
${IPT} -A OUTPUT -o ${INT} -p udp -d ${IP} --dport 53 --match state --state NEW -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# HTTP (TCP/80) authorizations
|
|
|
|
for IP in ${HTTPSITES}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 80 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 80 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# HTTPS (TCP/443) authorizations
|
|
|
|
for IP in ${HTTPSSITES}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 443 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 443 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# FTP (so complex protocol...) authorizations
|
|
|
|
for IP in ${FTPSITES}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
# requests on Control connection
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 21 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
# FTP port-mode on Data Connection
|
|
|
|
${IPT6} -A INPUT -p tcp --sport 20 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
# FTP passive-mode on Data Connection
|
|
|
|
# WARNING, this allow all connections on TCP ports > 1024
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport ${PORTSUSER} --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
# requests on Control connection
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 21 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
# FTP port-mode on Data Connection
|
|
|
|
${IPT} -A INPUT -p tcp --sport 20 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
# FTP passive-mode on Data Connection
|
|
|
|
# WARNING, this allow all connections on TCP ports > 1024
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport ${PORTSUSER} --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# SSH authorizations
|
|
|
|
for IP in ${SSHOK}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 22 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 22 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# SMTP authorizations
|
|
|
|
for IP in ${SMTPOK}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 25 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 25 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# secure SMTP (TCP/465 et TCP/587) authorizations
|
|
|
|
for IP in ${SMTPSECUREOK}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 465 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
${IPT6} -A INPUT -p tcp ! --syn --sport 587 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 465 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
${IPT} -A INPUT -p tcp ! --syn --sport 587 --dport ${PORTSUSER} -s ${IP} -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# NTP authorizations
|
|
|
|
for IP in ${NTPOK}; do
|
|
|
|
if is_ipv6 ${IP}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p udp --sport 123 -s ${IP} -j ACCEPT
|
|
|
|
${IPT6} -A OUTPUT -o ${INT} -p udp -d ${IP} --dport 123 --match state --state NEW -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p udp --sport 123 -s ${IP} -j ACCEPT
|
|
|
|
${IPT} -A OUTPUT -o ${INT} -p udp -d ${IP} --dport 123 --match state --state NEW -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# Proxy (Squid)
|
|
|
|
if is_proxy_enabled; then
|
|
|
|
# WARN: Squid only listen on IPv4 yet
|
|
|
|
# TODO: verify that the pattern used for IPv4 is relevant with IPv6
|
|
|
|
|
|
|
|
${IPT} -t nat -A OUTPUT -p tcp --dport 80 -m owner --uid-owner proxy -j ACCEPT
|
|
|
|
for dstip in ${PROXYBYPASS}; do
|
|
|
|
if ! is_ipv6 ${dstip}; then
|
|
|
|
${IPT} -t nat -A OUTPUT -p tcp --dport 80 -d "${dstip}" -j ACCEPT
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
${IPT} -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-port "${PROXYPORT:-'8888'}"
|
|
|
|
fi
|
|
|
|
|
|
|
|
# Output for backup servers
|
|
|
|
for server in ${BACKUPSERVERS}; do
|
|
|
|
server_port=$(echo "${server}" | awk -F : '{print $(NF)}')
|
|
|
|
server_ip=$(echo "${server}" | sed -e "s/:${server_port}$//")
|
|
|
|
|
|
|
|
if [ -n "${server_ip}" ] && [ -n "${server_port}" ]; then
|
|
|
|
if is_ipv6 ${server_ip}; then
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p tcp --sport "${server_port}" --dport 1024:65535 -s "${server_ip}" -m state --state ESTABLISHED,RELATED -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
${IPT} -A INPUT -p tcp --sport "${server_port}" --dport 1024:65535 -s "${server_ip}" -m state --state ESTABLISHED,RELATED -j ACCEPT
|
|
|
|
fi
|
|
|
|
else
|
|
|
|
echo "Unrecognized syntax for BACKUPSERVERS '${server}\`. Use space-separated IP:PORT tuples." >&2
|
|
|
|
exit 1
|
|
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
|
|
# Always allow ICMP
|
|
|
|
${IPT} -A INPUT -p icmp -j ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A INPUT -p icmpv6 -j ACCEPT
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
|
|
# IPTables policy
|
|
|
|
#################
|
|
|
|
|
|
|
|
# by default DROP INPUT packets
|
|
|
|
${IPT} -P INPUT DROP
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -P INPUT DROP
|
|
|
|
fi
|
|
|
|
|
|
|
|
# by default, no FORWARDING (deprecated for Virtual Machines)
|
|
|
|
#echo 0 > /proc/sys/net/ipv4/ip_forward
|
|
|
|
#${IPT} -P FORWARD DROP
|
|
|
|
#${IPT6} -P FORWARD DROP
|
|
|
|
|
|
|
|
# by default allow OUTPUT packets... but drop UDP packets (see OUTPUTDROP to drop OUTPUT packets)
|
|
|
|
${IPT} -P OUTPUT ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -P OUTPUT ACCEPT
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -A OUTPUT -o ${INT} -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A OUTPUT -o ${INT} -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -A OUTPUT -p udp -j DROP
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -A OUTPUT -p udp -j DROP
|
|
|
|
fi
|
|
|
|
|
|
|
|
if is_legacy_config; then
|
|
|
|
source_file_or_error "${config_file}"
|
|
|
|
fi
|
|
|
|
|
|
|
|
trap - INT TERM EXIT
|
|
|
|
|
|
|
|
echo "...starting IPTables rules is now finish : OK"
|
|
|
|
}
|
|
|
|
|
|
|
|
stop() {
|
|
|
|
echo "Flush all rules and accept everything..."
|
|
|
|
|
|
|
|
# Delete all rules
|
|
|
|
${IPT} -F INPUT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -F INPUT
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -F OUTPUT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -F OUTPUT
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -F LOG_DROP
|
|
|
|
${IPT} -F LOG_ACCEPT
|
|
|
|
${IPT} -F ONLYTRUSTED
|
|
|
|
${IPT} -F ONLYPRIVILEGIED
|
|
|
|
${IPT} -F NEEDRESTRICT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -F LOG_DROP
|
|
|
|
${IPT6} -F LOG_ACCEPT
|
|
|
|
${IPT6} -F ONLYTRUSTED
|
|
|
|
${IPT6} -F ONLYPRIVILEGIED
|
|
|
|
${IPT6} -F NEEDRESTRICT
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -t mangle -F
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -t mangle -F
|
|
|
|
fi
|
|
|
|
|
|
|
|
if is_docker_enabled; then
|
|
|
|
# WARN: IPv6 not yet supported
|
|
|
|
|
|
|
|
${IPT} -F DOCKER-USER
|
|
|
|
${IPT} -A DOCKER-USER -j RETURN
|
|
|
|
|
|
|
|
${IPT} -F MINIFW-DOCKER-PUB
|
|
|
|
${IPT} -X MINIFW-DOCKER-PUB
|
|
|
|
${IPT} -F MINIFW-DOCKER-PRIVILEGED
|
|
|
|
${IPT} -X MINIFW-DOCKER-PRIVILEGED
|
|
|
|
${IPT} -F MINIFW-DOCKER-TRUSTED
|
|
|
|
${IPT} -X MINIFW-DOCKER-TRUSTED
|
|
|
|
else
|
|
|
|
${IPT} -t nat -F
|
|
|
|
fi
|
|
|
|
|
|
|
|
# Accept all
|
|
|
|
${IPT} -P INPUT ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -P INPUT ACCEPT
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -P OUTPUT ACCEPT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -P OUTPUT ACCEPT
|
|
|
|
fi
|
|
|
|
#${IPT} -P FORWARD ACCEPT
|
|
|
|
#${IPT} -t nat -P PREROUTING ACCEPT
|
|
|
|
#${IPT} -t nat -P POSTROUTING ACCEPT
|
|
|
|
|
|
|
|
# Delete non-standard chains
|
|
|
|
${IPT} -X LOG_DROP
|
|
|
|
${IPT} -X LOG_ACCEPT
|
|
|
|
${IPT} -X ONLYPRIVILEGIED
|
|
|
|
${IPT} -X ONLYTRUSTED
|
|
|
|
${IPT} -X NEEDRESTRICT
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -X LOG_DROP
|
|
|
|
${IPT6} -X LOG_ACCEPT
|
|
|
|
${IPT6} -X ONLYPRIVILEGIED
|
|
|
|
${IPT6} -X ONLYTRUSTED
|
|
|
|
${IPT6} -X NEEDRESTRICT
|
|
|
|
fi
|
|
|
|
|
|
|
|
echo "...flushing IPTables rules is now finish : OK"
|
|
|
|
}
|
|
|
|
|
|
|
|
status() {
|
|
|
|
${IPT} -L -n -v --line-numbers
|
|
|
|
${IPT} -t nat -L -n -v --line-numbers
|
|
|
|
${IPT} -t mangle -L -n -v --line-numbers
|
|
|
|
${IPT6} -L -n -v --line-numbers
|
|
|
|
${IPT6} -t mangle -L -n -v --line-numbers
|
|
|
|
}
|
|
|
|
|
|
|
|
reset() {
|
|
|
|
echo "Reset all IPTables counters..."
|
|
|
|
|
|
|
|
${IPT} -Z
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -Z
|
|
|
|
fi
|
|
|
|
|
|
|
|
${IPT} -t nat -Z
|
|
|
|
|
|
|
|
${IPT} -t mangle -Z
|
|
|
|
if is_ipv6_enabled; then
|
|
|
|
${IPT6} -t mangle -Z
|
|
|
|
fi
|
|
|
|
|
|
|
|
echo "...reseting IPTables counters is now finish : OK"
|
|
|
|
}
|
|
|
|
|
|
|
|
echo "${NAME} version ${VERSION}"
|
|
|
|
source_configuration
|
|
|
|
|
|
|
|
case "${1:-''}" in
|
|
|
|
start)
|
|
|
|
start
|
|
|
|
;;
|
|
|
|
|
|
|
|
stop)
|
|
|
|
stop
|
|
|
|
;;
|
|
|
|
|
|
|
|
status)
|
|
|
|
status
|
|
|
|
;;
|
|
|
|
|
|
|
|
reset)
|
|
|
|
reset
|
|
|
|
;;
|
|
|
|
|
|
|
|
restart)
|
|
|
|
stop
|
|
|
|
start
|
|
|
|
;;
|
|
|
|
|
|
|
|
*)
|
|
|
|
echo "Usage: $0 {start|stop|restart|status|reset}"
|
|
|
|
exit 1
|
|
|
|
;;
|
|
|
|
esac
|
|
|
|
|
|
|
|
exit 0
|