Separated executable from ruleset file, other minor improvements. v1.0
This commit is contained in:
Jarno Rankinen
parent
2ae72cdfd5
commit
7fa9c36ffc
19
install.bash
19
install.bash
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@ -1,4 +1,4 @@
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#!/bin/bash
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#!/bin/bash -e
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# root check
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if [[ "$UID" -ne 0 ]]; then
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@ -6,17 +6,19 @@ if [[ "$UID" -ne 0 ]]; then
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exit 1
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fi
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RULES_FILE='/etc/jfw/jfw.rules'
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# Make /etc/jfw directory with "rules" file
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# (which is really the iptables script)
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if [[ -f /etc/jfw/jfw.rules ]]; then
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if [[ -f $RULES_FILE ]]; then
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echo "Found existing jfw configuration, do you wish to overwrite (y/n)?"
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read -n 1
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if [[ "$REPLY" == "y" ]];then
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echo "Overwriting '/etc/jfw/jfw.rules'"
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echo "Overwriting '$RULES_FILE'"
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cp jfw.rules /etc/jfw/
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chmod -R 700 /etc/jfw
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else
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echo "Not overwriting '/etc/jfw/jfw.rules' ."
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echo "Not overwriting '$RULES_FILE' ."
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fi
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else
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mkdir -p /etc/jfw
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@ -24,11 +26,12 @@ else
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chmod -R 700 /etc/jfw
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fi
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# Create symlink to jfw.rules:
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ln -s /etc/jfw/jfw.rules /usr/sbin/jfw
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# Copy executable in place:
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cp jfw /usr/local/sbin/jfw
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chown root:wheel /usr/local/sbin/jfw
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chmod 750 /usr/local/sbin/jfw
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# Install systemd service file,
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# Still needs to be enabled automatically
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cp jfw.service /etc/systemd/system
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systemctl daemon-reload
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@ -39,6 +42,6 @@ if [[ "$REPLY" == "yes" ]]; then
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systemctl enable --now jfw
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else
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echo "You can edit the iptables rules to your liking by editing"
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echo "'/etc/jfw/jfw.rules'. Afterwards you can use systemct to start"
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echo "'$RULES_FILE'. Afterwards you can use systemct to start"
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echo "and/or enable the firewall."
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fi
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@ -0,0 +1,94 @@
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#!/bin/bash
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PATH="/usr/sbin:/sbin:/usr/bin:/bin"
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RULES_FILE="/etc/jfw/jfw.rules"
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VERSION=1.0
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flush() {
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iptables -P INPUT ACCEPT
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iptables -P OUTPUT ACCEPT
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iptables -P FORWARD ACCEPT
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iptables -F INPUT
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iptables -F OUTPUT
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iptables -F FORWARD
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iptables -F -t nat
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iptables -F -t mangle
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ip6tables -P INPUT ACCEPT
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ip6tables -P OUTPUT ACCEPT
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ip6tables -P FORWARD ACCEPT
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ip6tables -F INPUT
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ip6tables -F OUTPUT
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ip6tables -F FORWARD
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ip6tables -F -t nat
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ip6tables -F -t mangle
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}
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load () {
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if [[ -f "$RULES_FILE" ]]; then
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flush
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. $RULES_FILE
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echo "Firewall rules applied"
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else
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echo "Could not find $RULES_FILE, flushing rules and exiting."
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flush
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exit 1
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fi
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}
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usage () {
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printf "Usage: $0 ACTION
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Available ACTIONs:
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flush restore default rules
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edit edit and apply rules
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logs view dmesg logs, add log rules via edit
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list list current ruleset
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reload (re)apply rules
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JFW version $VERSION
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"
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}
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if [[ "$#" -eq 0 ]]; then
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usage
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elif [[ "$1" == "flush" ]]; then
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flush
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echo "Firewall rules flushed."
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elif [[ "$1" == "edit" ]]; then
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if ! systemctl is-active jfw.service &> /dev/null; then
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printf "JFW is not running, you can edit the rules but\nthe changes won't take effect until you enable the service\n"
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OFFLINE=true
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fi
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sudoedit $RULES_FILE
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[[ "$OFFLINE" != "true" ]] && systemctl reload jfw.service
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echo "Firewall rules updated."
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elif [[ "$1" == "logs" ]]; then
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dmesg -T | grep JFW
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elif [[ "$1" == "list" ]]; then
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echo "********** IPv4 **********"
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iptables -S -v
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echo "********** IPv6 **********"
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ip6tables -S -v
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elif [[ "$1" == "load" ]]; then
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load
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elif [[ "$1" == "test" ]]; then
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load
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echo "Waiting 60 seconds before flushing rules.."
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SPINNER=('[* ]' '[ * ]' '[ * ]' '[ *]')
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j=0
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SLEEP=0
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while [[ "$SLEEP" -lt 60 ]]; do
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printf "${SPINNER[${j}]}\r"
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sleep 0.25
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let j=$j+1
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[[ "$j" -gt 3 ]] && j=0 && let SLEEP=$SLEEP+1
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done
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flush
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echo "Firewall test finished, rules flushed."
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elif [[ "$1" == "reload" ]]; then
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load
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elif [[ "$1" == "status" ]]; then
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systemctl status jfw.service
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fi
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exit 0
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144
jfw.rules
144
jfw.rules
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@ -1,81 +1,45 @@
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#!/bin/bash
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PATH="/usr/sbin:/sbin:/usr/bin:/bin"
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## These variables make setting up NAT easier, just uncomment the NAT sections
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## below
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PUBLIC_INTERFACE=
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LAN_INTERFACE=
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JFW_LOG_4='-j LOG --log-prefix "[ JFW IPv4 DROP ]"'
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JFW_LOG_6='-j LOG --log-prefix "[ JFW IPv6 DROP ]"'
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flush() {
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iptables -P INPUT ACCEPT
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iptables -P OUTPUT ACCEPT
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iptables -P FORWARD ACCEPT
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iptables -F INPUT
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iptables -F OUTPUT
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iptables -F FORWARD
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iptables -F -t nat
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iptables -F -t mangle
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ip6tables -P INPUT ACCEPT
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ip6tables -P OUTPUT ACCEPT
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ip6tables -P FORWARD ACCEPT
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ip6tables -F INPUT
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ip6tables -F OUTPUT
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ip6tables -F FORWARD
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ip6tables -F -t nat
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ip6tables -F -t mangle
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}
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if [[ "$1" == "flush" ]]; then
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flush
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echo "Firewall rules flushed."
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exit 0
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elif [[ "$1" == "edit" ]]; then
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sudoedit /etc/jfw/jfw.rules && systemctl reload jfw.service
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echo "Firewall rules updated."
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exit 0
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elif [[ "$1" == "logs" ]]; then
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dmesg -T | grep JFW
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exit 0
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elif [[ "$1" == "list" ]]; then
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echo "********** IPv4 **********"
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iptables -S -v
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echo "********** IPv6 **********"
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ip6tables -S -v
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exit 0
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fi
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flush
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#########
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# IPv4 #
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#########
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## Loop device
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iptables -A INPUT -i lo -j ACCEPT
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##======== General required =======##
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iptables -A INPUT -i lo -m conntrack --ctstate NEW -j ACCEPT ## Loop device
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iptables -A INPUT -p icmp -m conntrack --ctstate NEW -j ACCEPT ## ICMP, e.g. ping
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iptables -A INPUT -p ALL -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT ## Existing and related to outgoing
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## Ping, router advertisements etc
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iptables -A INPUT -p icmp -j ACCEPT
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iptables -A INPUT -p ALL -d 224.0.0.1 -j ACCEPT
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##============== NAT ==============##
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# iptables -A FORWARD -i $LAN_INTERFACE -o $PUBLIC_INTERFACE -m conntrack --ctstate NEW -j ACCEPT
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# iptables -A FORWARD -p ALL -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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# iptables -t nat -A POSTROUTING -i $LAN_INTERFACE -o $PUBLIC_INTERFACE -j MASQUERADE
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## established inbound
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iptables -A INPUT -p ALL -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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##============ Public =============##
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# iptables -A INPUT -i $PUBLIC_INTERFACE -p tcp --dport 80 -m conntrack --ctstate NEW -j ACCEPT
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# iptables -A INPUT -i $PUBLIC_INTERFACE -p tcp --dport 443 -m conntrack --ctstate NEW -j ACCEPT
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iptables -A INPUT -i $PUBLIC_INTERFACE -p tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
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## MDNS
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iptables -A INPUT -p udp --dport 5353 -j ACCEPT
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##========== LAN enp4s0 ===========##
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iptables -A INPUT -i enp4s0 -m conntrack --ctstate NEW -j ACCEPT
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# iptables -A INPUT -i enp4s0 -p ALL -d 224.0.0.1 -m conntrack --ctstate NEW -j ACCEPT
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# iptables -A INPUT -i enp4s0 -p udp --dport 5353 -m conntrack --ctstate NEW -j ACCEPT ## MDNS
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## Wireguard network
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## Replace <PORT> AND <INTERFACE>
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#iptables -A INPUT -p udp --dport <PORT> -j ACCEPT
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#iptables -A INPUT -i <WIREGUARD_INTERFACE> -j ACCEPT
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## SSH access
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iptables -A INPUT -p tcp --dport 22 -j ACCEPT
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## Logging and dropping other inbound packets
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## "log lines" may generate too much log entries
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## uncomment the following lines to enable logging
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#iptables -A INPUT -p ALL -j LOG --log-prefix "JFW IPv4 DROP::"
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##=========== Logging =============##
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# iptables -A INPUT -p ALL $JFW_LOG_4
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# iptables -A INPUT -p ALL -j DROP
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## Default policies for IPv4
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## Default policies for IPv4 ##
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iptables -P INPUT DROP
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iptables -P OUTPUT ACCEPT
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iptables -P FORWARD DROP
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@ -89,46 +53,38 @@ iptables -P FORWARD DROP
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# IPv6 #
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########
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## Loop device
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ip6tables -A INPUT -i lo -j ACCEPT
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##=========== General ===========##
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ip6tables -A INPUT -i lo -m conntrack --ctstate NEW -j ACCEPT ## Loop device
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ip6tables -A INPUT -p ipv6-icmp -m conntrack --ctstate NEW -j ACCEPT ## ICMP, e.g. ping
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ip6tables -A INPUT -p icmpv6 -m conntrack --ctstate NEW -j ACCEPT ## These are required for IPv6
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ip6tables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT ## Existing and related to outgoing
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ip6tables -A INPUT -d fe80::/10 -p udp -m conntrack --ctstate NEW -m udp --dport 546 -j ACCEPT ## DHCPv6-client
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# ip6tables -A INPUT -i enp4s0 -p udp --dport 547 -m conntrack --ctstate NEW -j ACCEPT ## DHCPv6 server
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## Ping, router advertisements etc
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ip6tables -A INPUT -p icmpv6 -j ACCEPT
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##============= NAT ===============##
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# ip6tables -A FORWARD -i $LAN_INTERFACE -o $PUBLIC_INTERFACE -m conntrack --ctstate NEW -j ACCEPT
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# ip6tables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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#
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# NAT may not be desired for IPv6, if the clients on your LAN get
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# a public IPv6 address from the DHCP server, you may want to leave this
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# commented
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# ip6tables -t nat -A POSTROUTING -o $PUBLIC_INTERFACE -j MASQUERADE
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## established inbound
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ip6tables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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##============ Public =============##
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# ip6tables -A INPUT -i $PUBLIC_INTERFACE -p tcp --dport 80 -m conntrack --ctstate NEW -j ACCEPT
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# ip6tables -A INPUT -i $PUBLIC_INTERFACE -p tcp --dport 443 -m conntrack --ctstate NEW -j ACCEPT
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ip6tables -A INPUT -i $PUBLIC_INTERFACE -p tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
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## MDNS
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ip6tables -A INPUT -p udp --dport 5353 -j ACCEPT
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##============= LAN ===============##
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ip6tables -A INPUT -i $LAN_INTERFACE -m conntrack --ctstate NEW -j ACCEPT
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# ip6tables -A INPUT -i enp4s0 -p udp --dport 5353 -j ACCEPT ## MDNS
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## Wireguard network
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## Replace <PORT> and <WIREGUARD_INTERFACE> and uncomment the following lines
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#ip6tables -A INPUT -p udp --dport <PORT> -j ACCEPT
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#ip6tables -A INPUT -i <WIREGUARD_INTERFACE> -j ACCEPT
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## Logging and dropping other inbound packets
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## "log lines" may generate too much log entries
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## uncomment the following lines to enable logging
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# ip6tables -A INPUT -p ALL -j LOG --log-prefix "JFW IPv6 DROP::"
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##=========== Logging =============##
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# ip6tables -A INPUT -p ALL $JFW_LOG_6
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# ip6tables -A INPUT -p ALL -j DROP
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## Default policies for IPv6
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##=== Default policies for IPv6 ===##
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ip6tables -P INPUT DROP
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ip6tables -P OUTPUT ACCEPT
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ip6tables -P FORWARD DROP
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## test-parameter for testing, flushes rules after 60 seconds
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## reload for resetting temporary changes to those defined in this file
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if [[ "$1" == "test" ]]; then
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sleep 60
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flush
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echo "Firewall test finished, rules flushed."
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exit 0
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elif [[ "$1" == "reload" ]]; then
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echo "Firewall rules reloaded."
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exit 0
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fi
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@ -3,9 +3,9 @@ Description=iptables rules
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After=network.target
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[Service]
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ExecStart=/etc/jfw/jfw.rules
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ExecStop=/etc/jfw/jfw.rules flush
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ExecReload=/etc/jfw/jfw.rules
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ExecStart=/usr/local/sbin/jfw load
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ExecStop=/usr/local/sbin/jfw flush
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ExecReload=/usr/local/sbin/jfw reload
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RemainAfterExit=yes
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[Install]
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@ -1,4 +1,4 @@
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#!/bin/bash
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#!/bin/bash -e
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if [[ "$UID" -ne 0 ]]; then
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echo "This script must be run as root."
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