firewall.sh: many improvements
This commit is contained in:
parent
969b4799e5
commit
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368
firewall.sh
368
firewall.sh
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@ -1,33 +1,53 @@
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#!/bin/bash
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#config
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alldevs=(enp0s25 wlp2s0 vpn0 vpn-gateway)
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if [ "$EUID" -ne 0 ]
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then echo "Please run as root"
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exit
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fi
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CFG="/etc/firewall.cfg"
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hometcp=(ssh vncd misc)
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homeudp=(avahi-daemon)
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outtcp=(ssh)
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outudp=()
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if [[ ! -f "${CFG}" ]]; then
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for i in $(ip -oneline addr show scope global|awk '{print $2}'|uniq); do
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devs+=($i)
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done
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echo "alldevs=(${devs[*]})" > "${CFG}"
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echo "ignore=()" >> "${CFG}"
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echo "hometcp=(ssh)" >> "${CFG}"
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echo "homeudp=()" >> "${CFG}"
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echo "outtcp=(ssh)" >> "${CFG}"
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echo "outudp=()" >> "${CFG}"
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echo "vpntcp=(ssh)" >> "${CFG}"
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echo "vpnudp=()" >> "${CFG}"
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echo "VPN_UNRESTRICTED=1" >> "${CFG}"
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echo "" >> "${CFG}"
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echo "nft="/usr/sbin/nft"" >> "${CFG}"
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echo "" >> "${CFG}"
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echo "declare -A ports=(" >> "${CFG}"
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echo " [ssh]=22" >> "${CFG}"
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echo " [smtp]=25" >> "${CFG}"
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echo " [dns]=53" >> "${CFG}"
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echo " [netbios-ssn]=139" >> "${CFG}"
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echo " [dovecot]=143" >> "${CFG}"
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echo " [microsoft-ds]=445" >> "${CFG}"
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echo " [cups-ipp]=631" >> "${CFG}"
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echo " [imaps]=993" >> "${CFG}"
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echo " [kdeconnect]=1714-1764" >> "${CFG}"
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echo " [avahi-daemon]=5353" >> "${CFG}"
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echo " [vncd]=5900" >> "${CFG}"
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echo " [mpd]=6600" >> "${CFG}"
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echo " [mpd-audio]=8000" >> "${CFG}"
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echo " [misc]=8080" >> "${CFG}"
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echo " [syncthing]=8384" >> "${CFG}"
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echo " [wireguard]=51820" >> "${CFG}"
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echo " [mosh]=60000-61000" >> "${CFG}"
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echo ")" >> "${CFG}"
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echo "${CFG} missed. Example created. Exit"
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exit
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else
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source "${CFG}"
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fi
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declare -A ports=(
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[ssh]=22
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[smtp]=25
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[dns]=53
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[netbios-ssn]=139
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[dovecot]=143
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[microsoft-ds]=445
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[cups-ipp]=631
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[imaps]=993
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[kdeconnect]=1714-1764
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[avahi-daemon]=5353
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[vncd]=5900
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[mpd]=6600
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[mpd-audio]=8000
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[misc]=8080
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[syncthing]=8384
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[wireguard]=51820
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[mosh]=60000-61000
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)
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nft="/usr/sbin/nft"
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##script
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@ -57,6 +77,7 @@ do
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done
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help
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[[ $LIST == "1" ]] && sudo nft -a list ruleset && exit
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flush
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check_deviceinput
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get_devices
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@ -65,7 +86,6 @@ init
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add_device
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remove_device
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set_rules
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[[ $LIST == "1" ]] && echo " " && sudo nft list ruleset -a
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exit 0
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@ -101,9 +121,9 @@ location() {
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LOCATION=home
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elif [[ "${HOME}" == "out" ]]; then
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LOCATION=out
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else
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LOCATION=out
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fi
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else
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LOCATION=out
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fi
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fi
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case $LOCATION in
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@ -117,6 +137,12 @@ location() {
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debug location: "${LOCATION[@]}"
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debug tcp ports: "${portstcp[@]}"
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debug udp ports: "${portsudp[@]}"
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if [[ ! "$VPN_UNRESTRICTED" == "1" ]]; then
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debug vpntcp ports: "${vpntcp[@]}"
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debug vpnudp ports: "${vpnudp[@]}"
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elif [[ "$VPN_UNRESTRICTED" == "1" ]]; then
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debug "vpn ports unrestricted"
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fi
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}
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check_deviceinput() {
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@ -174,10 +200,20 @@ get_devices() {
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if [[ -n $AUTOMATIC ]]; then
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if [[ $NM == "1" ]]; then
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for i in $(LANG=en_US.UTF-8 nmcli device status|grep " connected"|awk '{print $1}'); do
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for item2 in "${ignore[@]}"; do
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if [[ $i == "$item2" ]]; then
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continue 2
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fi
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done
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DEVON+=("$i")
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done
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else
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for i in $(ip -oneline addr show scope global|awk '{print $2}'|uniq); do
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for item2 in "${ignore[@]}"; do
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if [[ $i == "$item2" ]]; then
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continue 2
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fi
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done
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DEVON+=("$i")
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done
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fi
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@ -200,14 +236,16 @@ get_devices() {
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DEVOFF+=("$i")
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done
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fi
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for i in "${ignore[@]}"; do
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DEVOFF+=("$i")
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done
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debug alldevices: "${alldevs[*]}"
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debug devices on: "${DEVON[*]}"
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debug devices off: "${DEVOFF[*]}"
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}
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function init() {
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if ! $nft list ruleset -a |grep -q "table inet filter"; then
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if ! $nft -a list ruleset | grep -q "table inet filter"; then
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debug "Initialise rule: nft add table inet filter"
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$nft add table inet filter
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$nft add chain inet filter INPUT \{ type filter hook input priority 0 \; policy drop \; \}
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@ -225,25 +263,19 @@ function init() {
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add_device() {
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if [[ -n "${DEVON[*]}" ]]; then
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for _device in "${DEVON[@]}" "${VPNON[@]}"; do
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if ! $nft list table inet filter -a|grep -q "INPUT_${_device}"; then
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if ! $nft -a list table inet filter | grep -q "INPUT_${_device}"; then
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debug "Add device: ${_device}"
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$nft add chain inet filter INPUT_"${_device}"
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fi
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if ! $nft list ruleset -a |grep -q "jump INPUT_${_device}"; then
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if ! $nft -a list ruleset | grep -q "jump INPUT_${_device}"; then
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$nft add rule inet filter INPUT iif "${_device}" jump INPUT_"${_device}"
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fi
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if ! $nft list ruleset -a |grep -i "${_device}"| grep -q "${_device}: accept icmpv4 types"; then
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if ! $nft -a list ruleset | grep -i "${_device}" | grep -q "${_device}: accept icmpv4 types"; then
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$nft add rule inet filter INPUT_"${_device}" ip protocol icmp accept comment \""${_device}": accept icmpv4 types\"
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fi
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if ! $nft list ruleset -a |grep -i "${_device}"| grep -q "${_device}: accept icmpv6 types"; then
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if ! $nft -a list ruleset | grep -i "${_device}" | grep -q "${_device}: accept icmpv6 types"; then
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$nft add rule inet filter INPUT_"${_device}" ip6 nexthdr icmpv6 accept comment \""${_device}": accept icmpv6 types\"
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fi
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if [[ $_device == *"vpn"* ]]; then
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if ! $nft list ruleset -a |grep -q "$_device: accept all"; then
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debug "$_device: add rule \"$_device: accept all\""
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$nft add rule inet filter INPUT_"${_device}" accept comment \""$_device": accept all\"
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fi
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fi
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done
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fi
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}
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@ -251,10 +283,10 @@ add_device() {
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remove_device() {
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if [[ -n "${DEVOFF[*]}" ]]; then
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for _device in "${DEVOFF[@]}"; do
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if $nft list table inet filter -a|grep -q "INPUT_${_device}"; then
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if $nft -a list table inet filter | grep -q "INPUT_${_device}"; then
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debug "Delete device: ${_device}"
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$nft flush chain inet filter INPUT_"${_device}"
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HANDLE=$($nft list table inet filter -a|grep "jump INPUT_${_device}"|awk '{print $NF}')
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HANDLE=$($nft -a list table inet filter | grep "jump INPUT_${_device}" | awk '{print $NF}')
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$nft delete rule inet filter INPUT handle "${HANDLE}"
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$nft delete chain inet filter INPUT_"${_device}"
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fi
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@ -273,7 +305,7 @@ getports() {
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unchangedtcp=()
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unchangedudp=()
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for _prot in tcp udp; do
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for _port in $($nft list ruleset -a|grep -e dport| grep "${dev}"|grep "${_prot}"|awk '{print $12}'| tr ' ' '\n'); do
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for _port in $($nft -a list ruleset | grep -e dport | grep "${dev}" | grep "${_prot}" | awk '{print $12}' | tr ' ' '\n'); do
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if [[ $_prot == "tcp" ]]; then
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istportstcp+=("$_port")
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elif [[ $_prot == "udp" ]]; then
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@ -282,84 +314,168 @@ getports() {
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done
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done
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#TCP
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for item1 in "${portstcp[@]}"; do
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for item2 in "${istportstcp[@]}"; do
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if [[ $item1 == "$item2" ]]; then
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unchangedtcp+=("$item1")
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break
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fi
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done
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done
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turnofftcp=()
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for item1 in "${istportstcp[@]}"; do
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for item2 in "${portstcp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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turnofftcp+=("$item1")
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done
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if [[ ! $2 == "off" ]]; then
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turnontcp=()
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for item1 in "${portstcp[@]}"; do
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for item2 in "${istportstcp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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turnontcp+=("$item1")
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done
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fi
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if [[ ! ${dev} == *"vpn"* ]]; then
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#TCP
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unchangedtcp=()
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for item1 in "${portstcp[@]}"; do
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for item2 in "${istportstcp[@]}"; do
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if [[ $item1 == "$item2" ]]; then
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unchangedtcp+=("$item1")
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break
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fi
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done
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done
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turnofftcp=()
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for item1 in "${istportstcp[@]}"; do
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for item2 in "${portstcp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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turnofftcp+=("$item1")
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done
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if [[ ! $2 == "off" ]]; then
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turnontcp=()
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for item1 in "${portstcp[@]}"; do
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for item2 in "${istportstcp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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turnontcp+=("$item1")
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done
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fi
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#UDP
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for item1 in "${portsudp[@]}"; do
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for item2 in "${istportsudp[@]}"; do
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if [[ $item1 == "$item2" ]]; then
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unchangedudp+=("$item1")
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break
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fi
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done
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done
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#UDP
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unchangedudp=()
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for item1 in "${portsudp[@]}"; do
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for item2 in "${istportsudp[@]}"; do
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if [[ $item1 == "$item2" ]]; then
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unchangedudp+=("$item1")
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break
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fi
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done
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done
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turnoffudp=()
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for item1 in "${istportsudp[@]}"; do
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for item2 in "${portsudp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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turnoffudp=()
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for item1 in "${istportsudp[@]}"; do
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for item2 in "${portsudp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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# If we reached here, nothing matched.
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turnoffudp+=("$item1")
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done
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if [[ ! $2 == "off" ]]; then
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turnonudp=()
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for item1 in "${portsudp[@]}"; do
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for item2 in "${istportsudp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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# If we reached here, nothing matched.
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turnoffudp+=("$item1")
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done
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if [[ ! $2 == "off" ]]; then
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turnonudp=()
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for item1 in "${portsudp[@]}"; do
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for item2 in "${istportsudp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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# If we reached here, nothing matched.
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turnonudp+=("$item1")
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done
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fi
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# If we reached here, nothing matched.
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turnonudp+=("$item1")
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done
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fi
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elif [[ ${dev} == *"vpn"* ]]; then
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#TCP VPN
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unchangedtcp=()
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for item1 in "${vpntcp[@]}"; do
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for item2 in "${istportstcp[@]}"; do
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if [[ $item1 == "$item2" ]]; then
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unchangedtcp+=("$item1")
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break
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fi
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done
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done
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turnofftcp=()
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for item1 in "${istportstcp[@]}"; do
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for item2 in "${vpntcp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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turnofftcp+=("$item1")
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done
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if [[ ! $2 == "off" ]]; then
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vpnturnontcp=()
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for item1 in "${vpntcp[@]}"; do
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for item2 in "${istportstcp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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turnontcp+=("$item1")
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done
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fi
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#UDP
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unchangedudp=()
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for item1 in "${vpnudp[@]}"; do
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for item2 in "${istportsudp[@]}"; do
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if [[ $item1 == "$item2" ]]; then
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unchangedudp+=("$item1")
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break
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fi
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done
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done
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turnoffudp=()
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for item1 in "${istportsudp[@]}"; do
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for item2 in "${vpnudp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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# If we reached here, nothing matched.
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turnoffudp+=("$item1")
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done
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if [[ ! $2 == "off" ]]; then
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turnonudp=()
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for item1 in "${vpnudp[@]}"; do
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for item2 in "${istportsudp[@]}"; do
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[[ $item1 == "$item2" ]] && continue 2
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done
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# If we reached here, nothing matched.
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turnonudp+=("$item1")
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done
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if [[ ! "$VPN_UNRESTRICTED" == "1" ]]; then
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if $nft -a list ruleset | grep -q "${dev}: accept all"; then
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debug "${dev}: remove rule \"${dev}: accept all\""
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HANDLER=$($nft -a list table inet filter | grep "${dev}: accept all" | awk '{print $NF}')
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$nft delete rule inet filter INPUT_"${dev}" handle "${HANDLER}"
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fi
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MAKEVPNRULES=y
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elif [[ "$VPN_UNRESTRICTED" == "1" ]]; then
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if ! $nft -a list ruleset | grep -q "${dev}: accept all"; then
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debug "${dev}: add rule \"${dev}: accept all\""
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$nft add rule inet filter INPUT_"${dev}" accept comment \""${dev}": accept all\"
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fi
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MAKEVPNRULES=n
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turnofftcp=("${turnontcp[@]}" "${unchangedtcp[@]}")
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turnoffudp=("${turnonudp[@]}" "${unchangedudp[@]}")
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fi
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fi
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fi
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}
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function addrule() {
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[[ $MAKEVPNRULES == "n" ]] && return
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portnumber=$1
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portname=$2
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protocol=$3
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device=$4
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if ! $nft list table inet filter -a |grep -q "INPUT: allow ${portname} ${portnumber} ${protocol} ${device}"; then
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if ! $nft -a list table inet filter | grep -q "INPUT: allow ${portname} ${portnumber} ${protocol} ${device}"; then
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debug "$device: add rule for ${portname} (${portnumber}, ${protocol})"
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#$nft add rule inet filter INPUT iif "${device}" "${protocol}" dport "${portnumber}" ct state new log accept comment \"INPUT: allow "${portname}" "${portnumber}" "${protocol}" "${device}"\"
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$nft add rule inet filter INPUT_"${_device}" "${protocol}" dport "${portnumber}" ct state new log accept comment \"INPUT: allow "${portname}" "${portnumber}" "${protocol}" "${device}"\"
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fi
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}
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function removerule() {
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portnumber=$1
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portname=$2
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protocol=$3
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device=$4
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HANDLER=""
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HANDLER=$($nft list table inet filter -a |grep "INPUT: allow ${portname} ${portnumber} ${protocol} ${device}" | awk '{print $NF}')
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HANDLER=$($nft -a list table inet filter | grep "INPUT: allow ${portname} ${portnumber} ${protocol} ${device}" | awk '{print $NF}')
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if [[ $HANDLER ]]; then
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debug "$device: remove rule for ${portname} (${portnumber}, ${protocol})"
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#$nft delete rule inet filter INPUT handle "${HANDLER}"
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@ -369,41 +485,35 @@ function removerule() {
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set_rules() {
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for _device in "${DEVOFF[@]}"; do
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if [[ ! ${_device} == *"vpn"* ]]; then
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getports "${_device}" off
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for _pn in "${turnofftcp[@]}"; do
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removerule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
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done
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for _pn in "${turnoffudp[@]}"; do
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removerule "${ports[$_pn]}" "${_pn}" udp "${_device}"
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done
|
||||
for _pn in "${unchangedtcp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
|
||||
done
|
||||
|
||||
for _pn in "${unchangedudp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" udp "${_device}"
|
||||
done
|
||||
fi
|
||||
getports "${_device}" off
|
||||
for _pn in "${turnofftcp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
|
||||
done
|
||||
for _pn in "${turnoffudp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" udp "${_device}"
|
||||
done
|
||||
for _pn in "${unchangedtcp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
|
||||
done
|
||||
for _pn in "${unchangedudp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" udp "${_device}"
|
||||
done
|
||||
done
|
||||
|
||||
for _device in "${DEVON[@]}"; do
|
||||
if [[ ! "${_device}" == *"vpn"* ]]; then
|
||||
getports "${_device}"
|
||||
for _pn in "${turnofftcp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
|
||||
done
|
||||
for _pn in "${turnoffudp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" udp "${_device}"
|
||||
done
|
||||
for _pn in "${turnontcp[@]}"; do
|
||||
addrule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
|
||||
done
|
||||
for _pn in "${turnonudp[@]}"; do
|
||||
addrule "${ports[$_pn]}" "${_pn}" udp "${_device}"
|
||||
done
|
||||
fi
|
||||
getports "${_device}"
|
||||
for _pn in "${turnofftcp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
|
||||
done
|
||||
for _pn in "${turnoffudp[@]}"; do
|
||||
removerule "${ports[$_pn]}" "${_pn}" udp "${_device}"
|
||||
done
|
||||
for _pn in "${turnontcp[@]}"; do
|
||||
addrule "${ports[$_pn]}" "${_pn}" tcp "${_device}"
|
||||
done
|
||||
for _pn in "${turnonudp[@]}"; do
|
||||
addrule "${ports[$_pn]}" "${_pn}" udp "${_device}"
|
||||
done
|
||||
done
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue