initial commit
This commit is contained in:
Ludovic Cartier
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dd913c04bc
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14
files/firewall.service
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14
files/firewall.service
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[Unit]
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Description=Firewall
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After=network.target
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[Service]
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RemainAfterExit=yes
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ExecStart=/usr/local/bin/firewall start
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ExecStartPost=/bin/systemctl restart fail2ban.service
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ExecReload=/usr/local/bin/firewall reload
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ExecStop=/usr/local/bin/firewall stop
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User=root
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[Install]
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WantedBy=multi-user.target
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5
handlers/main.yml
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5
handlers/main.yml
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---
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- name: restart firewall
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systemd_service:
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name: postfix
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state: restarted
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35
tasks/install.yml
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35
tasks/install.yml
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---
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- name: firewall | apt update cache
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apt:
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update_cache: yes
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cache_valid_time: 86400 #One day
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- name: firewall | install iptables packages
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apt:
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name:
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- iptables
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state: present
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- name: firewall | copy script
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template:
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src: "firewall.j2"
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dest: "/usr/local/bin/firewall"
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mode: "0755"
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force: yes
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notify:
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- restart firewall
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- name: firewall | copy systemd unit file
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copy:
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src: "firewall.service"
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dest: "/lib/systemd/system/firewall.service"
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mode: "0644"
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force: yes
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notify:
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- restart firewall
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- name: fireall | enable on boot
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systemd:
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name: firewall
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enabled: yes
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masked: no
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6
tasks/main.yml
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6
tasks/main.yml
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---
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- name: requirements
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include_tasks: requirements.yml
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- name: install
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include_tasks: install.yml
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5
tasks/requirements.yml
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5
tasks/requirements.yml
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---
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- name: firewall | apt update cache
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apt:
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update_cache: yes
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cache_valid_time: 86400
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166
templates/firewall.j2
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166
templates/firewall.j2
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#!/bin/sh
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#
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# firewall script
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# <ludovic.cartier@brainsys.io>
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#
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PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
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IPT4=/sbin/iptables
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IPT6=/sbin/ip6tables
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NAME=firewall
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DESC="packet filter"
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PUBIF="{{ ansible_default_ipv4.interface }}"
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#PRIVATEIF=eth1
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case "$1" in
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start)
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echo -n "Initializing $DESC. \n"
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### IPv4 ###
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echo " \033[33mIPv4 : \033[0m"
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# DROP all incomming traffic
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$IPT4 -P INPUT DROP
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$IPT4 -P OUTPUT DROP
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$IPT4 -P FORWARD DROP
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echo " * Deny all input and output IPv4 connections : \033[32m[OK] \033[0m"
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# Unlimited access to loopback
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$IPT4 -A INPUT -j ACCEPT -i lo
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$IPT4 -A OUTPUT -j ACCEPT -o lo
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echo " * Accept all loopback connections : \033[32m[OK] \033[0m"
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# Allow full outgoing connection but no incomming stuff
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$IPT4 -A INPUT -j ACCEPT -m state --state ESTABLISHED,RELATED
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$IPT4 -A OUTPUT -j ACCEPT -m state --state NEW,ESTABLISHED,RELATED -m comment --comment "Authorize all established output access"
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echo " * Don't break IPv4 established connections : \033[32m[OK] \033[0m"
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# Allow incoming ICMP ping pong stuff
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$IPT4 -A INPUT -j ACCEPT -p icmp --icmp-type echo-request
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$IPT4 -A OUTPUT -j ACCEPT -p icmp --icmp-type echo-reply
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echo " * Accept request & reply ICMP requests : \033[32m[OK] \033[0m"
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## Protection rules
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# SMURF attack protection
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$IPT4 -A INPUT -p icmp -j DROP
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$IPT4 -A INPUT -p icmp -m limit --limit 2/second -j ACCEPT
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# Drop excessive RST packets to avoid smurf attacks
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$IPT4 -A INPUT -p tcp -m tcp --tcp-flags RST RST -m limit --limit 2/second --limit-burst 2 -j ACCEPT
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echo " * IPv4 protection rules : \033[32m[OK] \033[0m"
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# Admin chain
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$IPT4 -N ADMIN
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$IPT4 -A ADMIN -s 51.158.69.165/32 -j ACCEPT -m comment --comment "monit.brainsys.io"
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$IPT4 -A ADMIN -s 82.66.138.56/32 -j ACCEPT -m comment --comment "wireguard.brainsys.io"
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echo " * Creating admin chain : \033[32m[OK] \033[0m"
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# Custom rules
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$IPT4 -A INPUT -j ADMIN -p udp --dport 51820 --syn -m comment --comment "admin - IPv4 wireguard"
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#$IPT4 -A INPUT -j ADMIN -p tcp --dport 22 --syn -m comment --comment "admin - IPv4 ssh"
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$IPT4 -A INPUT -j ADMIN -p tcp --dport 873 --syn -m comment --comment "admin - IPv4 rsync"
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$IPT4 -A INPUT -j ADMIN -p tcp --dport 5666 --syn -m comment --comment "admin - IPv4 nrpe"
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$IPT4 -A INPUT -j ADMIN -p tcp --dport 4949 --syn -m comment --comment "admin - IPv4 munin-node"
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$IPT4 -A INPUT -j ACCEPT -p tcp --dport 22 -m comment --comment "IPv4 ssh"
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$IPT4 -A INPUT -j ACCEPT -p tcp --dport 80 -m comment --comment "IPv4 http"
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$IPT4 -A INPUT -j ACCEPT -p tcp --dport 443 -m comment --comment "IPv4 https"
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echo " * Custom IPv4 rules : \033[32m[OK] \033[0m"
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# REJECT everything else
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$IPT4 -A INPUT -j REJECT --reject-with tcp-reset -p tcp
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$IPT4 -A INPUT -j REJECT -p udp
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echo " * Reject everything else : \033[32m[OK] \033[0m"
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### IPv6 ###
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echo " \033[33mIPv6 : \033[0m"
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# DROP all incomming traffic
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$IPT6 -P INPUT DROP
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$IPT6 -P OUTPUT DROP
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$IPT6 -P FORWARD DROP
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echo " * Deny all input and output IPv6 connections : \033[32m[OK] \033[0m"
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# Unlimited access to loopback
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$IPT6 -A INPUT -j ACCEPT -i lo
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$IPT6 -A OUTPUT -j ACCEPT -o lo
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echo " * Accept all loopback connections : \033[32m[OK] \033[0m"
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# Allow full outgoing connection but no incomming stuff
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$IPT6 -A INPUT -j ACCEPT -m state --state ESTABLISHED,RELATED
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$IPT6 -A OUTPUT -j ACCEPT -m state --state NEW,ESTABLISHED,RELATED -m comment --comment "Authorize all established output access"
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echo " * Don't break IPv6 established connections : \033[32m[OK] \033[0m"
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# Allow incoming ICMP ping pong stuff
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#$IPT6 -A INPUT -j ACCEPT -p icmpv6 --icmpv6-type echo-request
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#$IPT6 -A OUTPUT -j ACCEPT -p icmpv6 --icmpv6-type echo-reply
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$IPT6 -A INPUT -j ACCEPT -p icmpv6
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$IPT6 -A OUTPUT -j ACCEPT -p icmpv6
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echo " * Accept request & reply ICMP requests : \033[32m[OK] \033[0m"
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## Protection rules
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# SMURF attack protection
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$IPT6 -A INPUT -p icmpv6 -j DROP
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$IPT6 -A INPUT -p icmpv6 -m limit --limit 2/second -j ACCEPT
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# Drop excessive RST packets to avoid smurf attacks
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$IPT6 -A INPUT -p tcp -m tcp --tcp-flags RST RST -m limit --limit 2/second --limit-burst 2 -j ACCEPT
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echo " * IPv6 protection rules : \033[32m[OK] \033[0m"
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# Custom rules
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$IPT6 -A INPUT -j ACCEPT -p tcp --dport 80 --syn -m comment --comment "IPv6 http"
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$IPT6 -A INPUT -j ACCEPT -p tcp --dport 443 --syn -m comment --comment "IPv6 https"
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#$IPT6 -A INPUT -j ACCEPT -p tcp --dport 22 -m comment --comment "IPv6 ssh"
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#$IPT6 -A INPUT -j ACCEPT -p tcp --dport 25 -m comment --comment "IPv6 smtp"
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echo " * Custom IPv6 rules : \033[32m[OK] \033[0m"
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# REJECT everything else
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$IPT6 -A INPUT -j REJECT --reject-with tcp-reset -p tcp
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$IPT6 -A INPUT -j REJECT -p udp
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echo " * Reject everything else : \033[32m[OK] \033[0m"
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# Log everything else
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#$IPT6 -A INPUT -i $PUBIF -j LOG --log-prefix "Firewall IPv6 : "
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;;
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stop)
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echo -n "Resetting $DESC. \n"
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### IPv4 ###
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$IPT4 -F
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$IPT4 -X
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$IPT4 -P FORWARD ACCEPT
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$IPT4 -P INPUT ACCEPT
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$IPT4 -P OUTPUT ACCEPT
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$IPT4 -t nat -F
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$IPT4 -t nat -X
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$IPT4 -t mangle -F
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$IPT4 -t mangle -X
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echo " * Cleaning IPv4 chains and rules : \033[32m[OK] \033[0m"
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### IPv6 ###
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$IPT6 -F
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$IPT6 -X
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$IPT6 -P FORWARD ACCEPT
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$IPT6 -P INPUT ACCEPT
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$IPT6 -P OUTPUT ACCEPT
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$IPT6 -t mangle -F
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$IPT6 -t mangle -X
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echo " * Cleaning IPv6 chains and rules : \033[32m[OK] \033[0m"
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echo
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;;
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restart|force-reload)
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$0 stop
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$0 start
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;;
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status)
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echo "\033[33mIPv4 chains and rules : \033[0m"
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$IPT4 -L -n -v
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echo
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echo "\033[33mIPv6 chains and rules : \033[0m"
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$IPT6 -L -n -v
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;;
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*)
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echo "Usage: firewall {start|stop|restart|force-reload|status}" >&2
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exit 1
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;;
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esac
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exit 0
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