1116 lines
35 KiB
Bash
Executable file
1116 lines
35 KiB
Bash
Executable file
#!/bin/sh
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# shellcheck disable=SC2059
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# minifirewall is a shell script for easy firewalling on a standalone server
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# It uses 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: $syslog
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: start and stop the firewall
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# Description: Firewall designed for standalone server
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### END INIT INFO
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VERSION="22.06"
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NAME="minifirewall"
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# shellcheck disable=SC2034
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DESC="Firewall designed for standalone server"
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set -u
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# Variables configuration
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#########################
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config_file="/etc/default/minifirewall"
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includes_dir="/etc/minifirewall.d"
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# iptables paths
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IPT=$(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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STATE_FILE_LATEST='/var/run/minifirewall_state_latest'
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STATE_FILE_CURRENT='/var/run/minifirewall_state_current'
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STATE_FILE_PREVIOUS='/var/run/minifirewall_state_previous'
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STATE_FILE_DIFF='/var/run/minifirewall_state_diff'
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LOGGER_BIN=$(command -v logger)
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# No colors by default
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RED=''
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GREEN=''
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YELLOW=''
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BLUE=''
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MAGENTA=''
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CYAN=''
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WHITE=''
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BOLD=''
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RESET=''
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# check if stdout is a terminal...
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if [ -t 1 ]; then
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# see if it supports colors...
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ncolors=$(tput colors)
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# shellcheck disable=SC2086
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if [ -n "${ncolors}" ] && [ ${ncolors} -ge 8 ]; then
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RED=$(tput setaf 1)
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GREEN=$(tput setaf 2)
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YELLOW=$(tput setaf 3)
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BLUE=$(tput setaf 4)
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MAGENTA=$(tput setaf 5)
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CYAN=$(tput setaf 6)
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WHITE=$(tput setaf 7)
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BOLD=$(tput bold)
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RESET='\e[m'
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fi
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fi
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## pseudo dry-run :
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## Uncomment and call these functions instead of the real iptables and ip6tables commands
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# IPT="fake_iptables"
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# IPT6="fake_ip6tables"
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# fake_iptables() {
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# printf "DRY-RUN iptables %s\n" "$*"
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# }
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# fake_ip6tables() {
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# printf "DRY-RUN ip6tables %s\n" "$*"
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# }
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## Beware that commands executed from included files are not modified by this trick.
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syslog_info() {
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if [ -x "${LOGGER_BIN}" ]; then
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${LOGGER_BIN} -t "${NAME}" -p daemon.info "$1"
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fi
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}
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syslog_error() {
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if [ -x "${LOGGER_BIN}" ]; then
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${LOGGER_BIN} -t "${NAME}" -p daemon.error "$1"
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fi
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}
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sort_values() {
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echo "$*" | tr ' ' '\n' | sort -h
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}
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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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else
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intable=""
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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=$1
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syslog_info "sourcing \`${file}'"
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printf "${BLUE}sourcing \`%s'${RESET}\n" "${file}"
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tmpfile=$(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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syslog_error "Error while sourcing ${file}"
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printf "${RED}%s returns standard or error output (see below). Stopping.${RESET}\n" ${file} >&2
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cat "${tmpfile}"
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exit 1
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fi
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rm -f "${tmpfile}"
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}
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source_configuration() {
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if ! test -f ${config_file}; then
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printf "${RED}%s does not exist${RESET}\n" "${config_file}" >&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 ${old_config_file}; then
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printf "${YELLOW}%s is deprecated and ignored. Rename it to %s${RESET}\n" "${old_config_file}" "${config_file}" >&2
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fi
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exit 1
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fi
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# If we find something other than a blank line, a comment or a variable assignment
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if grep --quiet --extended-regexp --invert-match "^\s*(#|$|\w+=)" "${config_file}"; then
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# Backward compatible mode
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###########################
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printf "${YELLOW}legacy config detected${RESET}\n"
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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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# get only variable assignments
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grep -E "^\s*\w+=" "${config_file}" > "${tmp_config_file}"
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source_file_or_error "${tmp_config_file}"
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rm -f "${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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check_unpersisted_state() {
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cmp_bin=$(command -v cmp)
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diff_bin=$(command -v diff)
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if [ -z "${cmp_bin}" ]; then
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printf "${YELLOW}skip state comparison (Can't find cmp command)${RESET}\n" >&2
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elif [ -z "${diff_bin}" ]; then
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printf "${YELLOW}skip state comparison (Can't find diff command)${RESET}\n" >&2
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else
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# store current state
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mkdir -p "$(dirname "${STATE_FILE_CURRENT}")"
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status_without_numbers > "${STATE_FILE_CURRENT}"
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# clean previous diff file
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rm -f "${STATE_FILE_DIFF}"
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if [ -f "${STATE_FILE_LATEST}" ]; then
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cmp_result=$(cmp "${STATE_FILE_LATEST}" "${STATE_FILE_CURRENT}")
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cmp_rc=$?
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if [ ${cmp_rc} -eq 0 ]; then
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# echo " rules have not changed since latest start"
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:
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elif [ ${cmp_rc} -eq 1 ]; then
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diff -u "${STATE_FILE_LATEST}" "${STATE_FILE_CURRENT}" > "${STATE_FILE_DIFF}"
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printf "${YELLOW}WARNING: current state is different than persisted state, check %s${RESET}\n" "${STATE_FILE_DIFF}" >&2
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else
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printf "${RED}ERROR comparing rules:${RESET}\n" >&2
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echo "${cmp_result}" >&2
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fi
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fi
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# cleanup
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rm -f "${STATE_FILE_CURRENT}"
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fi
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}
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report_state_changes() {
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cmp_bin=$(command -v cmp)
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diff_bin=$(command -v diff)
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if [ -z "${cmp_bin}" ]; then
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printf "${YELLOW}skip state comparison (Can't find cmp command)${RESET}\n" >&2
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return
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elif [ -z "${diff_bin}" ]; then
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printf "${YELLOW}skip state comparison (Can't find diff command)${RESET}\n" >&2
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else
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# If there is a known state
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# let's compare it with the current state
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if [ -f "${STATE_FILE_LATEST}" ]; then
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check_unpersisted_state
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fi
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# Then reset the known state
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mkdir -p "$(dirname "${STATE_FILE_LATEST}")"
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status_without_numbers > "${STATE_FILE_LATEST}"
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# But if there is a previous known state
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# let's compare with the new known state
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if [ -f "${STATE_FILE_PREVIOUS}" ]; then
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cmp_result=$(cmp "${STATE_FILE_PREVIOUS}" "${STATE_FILE_LATEST}")
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cmp_rc=$?
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if [ ${cmp_rc} -eq 0 ]; then
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# echo "Rules have not changed since previous start"
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:
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elif [ ${cmp_rc} -eq 1 ]; then
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diff -u "${STATE_FILE_PREVIOUS}" "${STATE_FILE_LATEST}" > "${STATE_FILE_DIFF}"
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printf "${YELLOW}INFO: rules have changed since latest start, check %s${RESET}\n" "${STATE_FILE_DIFF}" >&2
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else
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printf "${RED}ERROR comparing rules:${RESET}\n" >&2
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echo "${cmp_result}" >&2
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fi
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fi
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fi
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}
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start() {
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syslog_info "starting"
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printf "${BOLD}${NAME} starting${RESET}\n"
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# Stop and warn if error!
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set -e
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trap 'printf "${RED}${NAME} failed : an error occured during startup.${RESET}\n"; syslog_error "failed" ' 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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# Apparently not applicable to IPv6
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else
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printf "${RED}ERROR: invalid %s value '%s', must be '0' or '1'.\n" "SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS" "${SYSCTL_ICMP_ECHO_IGNORE_BROADCASTS}" >&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 "${SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES}" > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
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# Apparently not applicable to IPv6
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else
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printf "${RED}ERROR: invalid %s value '%s', must be '0' or '1'.\n" "SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES" "${SYSCTL_ICMP_IGNORE_BOGUS_ERROR_RESPONSES}" >&2
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exit 1
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fi
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if [ "${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}" > "${proc_sys_file}"
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done
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if is_ipv6_enabled; then
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for proc_sys_file in /proc/sys/net/ipv6/conf/*/accept_source_route; do
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echo "${SYSCTL_ACCEPT_SOURCE_ROUTE}" > "${proc_sys_file}"
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done
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fi
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else
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printf "${RED}ERROR: invalid %s value '%s', must be '0' or '1'.\n" "SYSCTL_ACCEPT_SOURCE_ROUTE" "${SYSCTL_ACCEPT_SOURCE_ROUTE}" >&2
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exit 1
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fi
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if [ "${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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# Apparently not applicable to IPv6
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else
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printf "${RED}ERROR: invalid %s value '%s', must be '0' or '1'.\n" "SYSCTL_TCP_SYNCOOKIES" "${SYSCTL_TCP_SYNCOOKIES}" >&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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if is_ipv6_enabled; then
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for proc_sys_file in /proc/sys/net/ipv6/conf/*/accept_redirects; do
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echo "${SYSCTL_ICMP_REDIRECTS}" > "${proc_sys_file}"
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done
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fi
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else
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printf "${RED}ERROR: invalid %s value '%s', must be '0' or '1'.\n" "SYSCTL_ICMP_REDIRECTS" "${SYSCTL_ICMP_REDIRECTS}" >&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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# Apparently not applicable to IPv6
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else
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printf "${RED}ERROR: invalid %s value '%s', must be '0' or '1'.\n" "SYSCTL_RP_FILTER" "${SYSCTL_RP_FILTER}" >&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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# Apparently not applicable to IPv6
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else
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printf "${RED}ERROR: invalid %s value '%s', must be '0' or '1'.\n" "SYSCTL_LOG_MARTIANS" "${SYSCTL_LOG_MARTIANS}" >&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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# 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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# IP/ports lists are sorted to have consistent ordering
|
|
# You can disable this feature by simply commenting the following lines
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|
LOOPBACK=$(sort_values ${LOOPBACK})
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INTLAN=$(sort_values ${INTLAN})
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TRUSTEDIPS=$(sort_values ${TRUSTEDIPS})
|
|
PRIVILEGIEDIPS=$(sort_values ${PRIVILEGIEDIPS})
|
|
SERVICESTCP1p=$(sort_values ${SERVICESTCP1p})
|
|
SERVICESUDP1p=$(sort_values ${SERVICESUDP1p})
|
|
SERVICESTCP1=$(sort_values ${SERVICESTCP1})
|
|
SERVICESUDP1=$(sort_values ${SERVICESUDP1})
|
|
SERVICESTCP2=$(sort_values ${SERVICESTCP2})
|
|
SERVICESUDP2=$(sort_values ${SERVICESUDP2})
|
|
SERVICESTCP3=$(sort_values ${SERVICESTCP3})
|
|
SERVICESUDP3=$(sort_values ${SERVICESUDP3})
|
|
DNSSERVEURS=$(sort_values ${DNSSERVEURS})
|
|
HTTPSITES=$(sort_values ${HTTPSITES})
|
|
HTTPSSITES=$(sort_values ${HTTPSSITES})
|
|
FTPSITES=$(sort_values ${FTPSITES})
|
|
SSHOK=$(sort_values ${SSHOK})
|
|
SMTPOK=$(sort_values ${SMTPOK})
|
|
SMTPSECUREOK=$(sort_values ${SMTPSECUREOK})
|
|
NTPOK=$(sort_values ${NTPOK})
|
|
PROXYBYPASS=$(sort_values ${PROXYBYPASS})
|
|
BACKUPSERVERS=$(sort_values ${BACKUPSERVERS})
|
|
|
|
# Trusted ip addresses
|
|
${IPT} -N ONLYTRUSTED
|
|
${IPT} -A ONLYTRUSTED -j LOG_DROP
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -N ONLYTRUSTED
|
|
${IPT6} -A ONLYTRUSTED -j LOG_DROP
|
|
fi
|
|
for ip in ${TRUSTEDIPS}; do
|
|
if is_ipv6 ${ip}; then
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -I ONLYTRUSTED -s ${ip} -j ACCEPT
|
|
fi
|
|
else
|
|
${IPT} -I ONLYTRUSTED -s ${ip} -j ACCEPT
|
|
fi
|
|
done
|
|
|
|
# Privilegied ip addresses
|
|
# (trusted ip addresses *are* privilegied)
|
|
${IPT} -N ONLYPRIVILEGIED
|
|
${IPT} -A ONLYPRIVILEGIED -j ONLYTRUSTED
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -N ONLYPRIVILEGIED
|
|
${IPT6} -A ONLYPRIVILEGIED -j ONLYTRUSTED
|
|
fi
|
|
for ip in ${PRIVILEGIEDIPS}; do
|
|
if is_ipv6 ${ip}; then
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -I ONLYPRIVILEGIED -s ${ip} -j ACCEPT
|
|
fi
|
|
else
|
|
${IPT} -I ONLYPRIVILEGIED -s ${ip} -j ACCEPT
|
|
fi
|
|
done
|
|
|
|
# Chain for restrictions (blacklist IPs/ranges)
|
|
${IPT} -N NEEDRESTRICT
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -N NEEDRESTRICT
|
|
fi
|
|
|
|
# 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
|
|
if ! is_ipv6 ${srcip}; then
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
fi
|
|
done
|
|
|
|
for srcip in ${TRUSTEDIPS}; do
|
|
if ! is_ipv6 ${srcip}; then
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
fi
|
|
done
|
|
done
|
|
|
|
for dstport in ${SERVICESUDP2}; do
|
|
for srcip in ${PRIVILEGIEDIPS}; do
|
|
if ! is_ipv6 ${srcip}; then
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p udp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
fi
|
|
done
|
|
|
|
for srcip in ${TRUSTEDIPS}; do
|
|
if ! is_ipv6 ${srcip}; then
|
|
${IPT} -I MINIFW-DOCKER-PRIVILEGED -p udp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
fi
|
|
done
|
|
done
|
|
|
|
# Trusted services (accessible from trusted IPs)
|
|
for dstport in ${SERVICESTCP3}; do
|
|
for srcip in ${TRUSTEDIPS}; do
|
|
if ! is_ipv6 ${srcip}; then
|
|
${IPT} -I MINIFW-DOCKER-TRUSTED -p tcp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
fi
|
|
done
|
|
done
|
|
|
|
for dstport in ${SERVICESUDP3}; do
|
|
for srcip in ${TRUSTEDIPS}; do
|
|
if ! is_ipv6 ${srcip}; then
|
|
${IPT} -I MINIFW-DOCKER-TRUSTED -p udp -s "${srcip}" --dport "${dstport}" -j RETURN
|
|
fi
|
|
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 "${server_ip}" -m state --state ESTABLISHED,RELATED -j ACCEPT
|
|
fi
|
|
else
|
|
printf "${RED}ERROR: unrecognized syntax for BACKUPSERVERS '%s\`. Use space-separated IP:PORT tuples.${RESET}\n" "${server}" >&2
|
|
exit 1
|
|
fi
|
|
done
|
|
|
|
# Always allow ICMP
|
|
${IPT} -A INPUT -p icmp -j ACCEPT
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -A INPUT -p icmpv6 -j ACCEPT
|
|
fi
|
|
|
|
# source config file for remaining commands
|
|
if is_legacy_config; then
|
|
source_file_or_error "${config_file}"
|
|
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
|
|
${IPT6} -A OUTPUT -p udp -j DROP
|
|
fi
|
|
|
|
# Finish
|
|
########################
|
|
|
|
trap - INT TERM EXIT
|
|
|
|
syslog_info "started"
|
|
printf "${GREEN}${BOLD}${NAME} started${RESET}\n"
|
|
|
|
# No need to exit on error anymore
|
|
set +e
|
|
|
|
report_state_changes
|
|
}
|
|
|
|
stop() {
|
|
syslog_info "stopping"
|
|
printf "${BOLD}${NAME} stopping${RESET}\n"
|
|
|
|
printf "${BLUE}flushing all rules and accepting everything${RESET}\n"
|
|
|
|
mkdir -p "$(dirname "${STATE_FILE_PREVIOUS}")"
|
|
status_without_numbers > "${STATE_FILE_PREVIOUS}"
|
|
|
|
# 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
|
|
${IPT6} -X NEEDRESTRICT
|
|
fi
|
|
|
|
rm -f "${STATE_FILE_LATEST}" "${STATE_FILE_CURRENT}"
|
|
|
|
syslog_info "stopped"
|
|
printf "${GREEN}${BOLD}${NAME} stopped${RESET}\n"
|
|
}
|
|
|
|
status() {
|
|
printf "${BLUE}#### iptables --list ###############################${RESET}\n"
|
|
${IPT} --list --numeric --verbose --line-numbers
|
|
printf "\n${BLUE}#### iptables --table nat --list ###################${RESET}\n"
|
|
${IPT} --table nat --list --numeric --verbose --line-numbers
|
|
printf "\n${BLUE}#### iptables --table mangle --list ################${RESET}\n"
|
|
${IPT} --table mangle --list --numeric --verbose --line-numbers
|
|
if is_ipv6_enabled; then
|
|
printf "\n${BLUE}#### ip6tables --list ##############################${RESET}\n"
|
|
${IPT6} --list --numeric --verbose --line-numbers
|
|
printf "\n${BLUE}#### ip6tables --table mangle --list ###############${RESET}\n"
|
|
${IPT6} --table mangle --list --numeric --verbose --line-numbers
|
|
fi
|
|
}
|
|
|
|
status_without_numbers() {
|
|
printf "${BLUE}#### iptables --list ###############################${RESET}\n"
|
|
${IPT} --list --numeric
|
|
printf "\n${BLUE}#### iptables --table nat --list ###################${RESET}\n"
|
|
${IPT} --table nat --list --numeric
|
|
printf "\n${BLUE}#### iptables --table mangle --list ################${RESET}\n"
|
|
${IPT} --table mangle --list --numeric
|
|
if is_ipv6_enabled; then
|
|
printf "\n${BLUE}#### ip6tables --list ##############################${RESET}\n"
|
|
${IPT6} --list --numeric
|
|
printf "\n${BLUE}#### ip6tables --table mangle --list ###############${RESET}\n"
|
|
${IPT6} --table mangle --list --numeric
|
|
fi
|
|
}
|
|
|
|
reset() {
|
|
syslog_info "resetting"
|
|
printf "${BOLD}${NAME} resetting${RESET}\n"
|
|
|
|
${IPT} -Z
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -Z
|
|
fi
|
|
|
|
${IPT} -t nat -Z
|
|
|
|
${IPT} -t mangle -Z
|
|
if is_ipv6_enabled; then
|
|
${IPT6} -t mangle -Z
|
|
fi
|
|
|
|
syslog_info "reset"
|
|
printf "${GREEN}${BOLD}${NAME} reset${RESET}\n"
|
|
}
|
|
show_version() {
|
|
cat <<END
|
|
${NAME} version ${VERSION}
|
|
|
|
Copyright 2007-2022 Evolix <info@evolix.fr>.
|
|
|
|
${NAME} comes with ABSOLUTELY NO WARRANTY.
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 3
|
|
of the License.
|
|
END
|
|
}
|
|
|
|
case "${1:-''}" in
|
|
start)
|
|
source_configuration
|
|
check_unpersisted_state
|
|
|
|
start
|
|
;;
|
|
|
|
stop)
|
|
source_configuration
|
|
check_unpersisted_state
|
|
|
|
stop
|
|
;;
|
|
|
|
status)
|
|
source_configuration
|
|
check_unpersisted_state
|
|
|
|
status
|
|
;;
|
|
|
|
reset)
|
|
source_configuration
|
|
check_unpersisted_state
|
|
|
|
reset
|
|
;;
|
|
|
|
restart)
|
|
source_configuration
|
|
check_unpersisted_state
|
|
|
|
stop
|
|
start
|
|
;;
|
|
|
|
version)
|
|
show_version
|
|
;;
|
|
|
|
*)
|
|
echo "Usage: $0 {start|stop|restart|status|reset|version}"
|
|
exit 1
|
|
;;
|
|
esac
|
|
|
|
exit 0
|