From 139266198076380472bdb2cefcef63ab9362f69e Mon Sep 17 00:00:00 2001
From: Edwin Lyon <edwin@noreply.git.technerdonline.com>
Date: Tue, 22 Feb 2022 19:24:01 -0800
Subject: [PATCH] Add 'iptables/rules.v4'

---
 iptables/rules.v4 | 60 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 iptables/rules.v4

diff --git a/iptables/rules.v4 b/iptables/rules.v4
new file mode 100644
index 0000000..c67eda8
--- /dev/null
+++ b/iptables/rules.v4
@@ -0,0 +1,60 @@
+*mangle
+:PREROUTING ACCEPT [0:0]
+:INPUT ACCEPT [0:0]
+:FORWARD ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+:POSTROUTING ACCEPT [0:0]
+COMMIT
+
+*nat
+:PREROUTING ACCEPT [0:0]
+:INPUT ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+:POSTROUTING ACCEPT [0:0]
+-A PREROUTING -i eth0 -d {PUBLIC_IP} -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.128.0.3:80
+-A PREROUTING -i eth0 -d {PUBLIC_IP} -p tcp -m tcp --dport 443 -j DNAT --to-destination 10.128.0.3:443
+-A POSTROUTING -d 10.128.0.3 -o eth1 -p tcp -m tcp --dport 80 -j SNAT --to-source 10.128.0.2
+-A POSTROUTING -d 10.128.0.3 -o eth1 -p tcp -m tcp --dport 443 -j SNAT --to-source 10.128.0.2
+-A POSTROUTING -s 10.128.0.2 -o eth0 -j SNAT --to-source {PUBLIC_IP}
+-A POSTROUTING -s 10.128.0.0/20 ! -d 10.128.0.0/20 -j MASQUERADE
+COMMIT
+
+*filter
+:INPUT DROP [0:0]
+:FORWARD DROP [0:0]
+:OUTPUT ACCEPT [0:0]
+:FILTERS - [0:0]
+-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+-A INPUT -i lo -j ACCEPT
+-A INPUT -m conntrack --ctstate INVALID -j DROP
+-A INPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 5/sec -j ACCEPT
+-A INPUT -i eth1 -m conntrack --ctstate NEW -s 10.128.0.0/20 -j ACCEPT
+-A INPUT -j FILTERS
+-A INPUT -j DROP
+-A FORWARD -o eth1 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+-A FORWARD -i eth1 -o eth1 -m conntrack --ctstate NEW -s 10.128.0.0/20 -j ACCEPT
+-A FORWARD -o eth0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+-A FORWARD -i eth1 -o eth0 -m conntrack --ctstate NEW -s 10.128.0.0/20 -j ACCEPT
+-A FORWARD -i eth0 -o eth1 -j FILTERS
+-A OUTPUT -o lo -j ACCEPT
+-A OUTPUT -o eth0 -j ACCEPT
+-A OUTPUT -o eth1 -j ACCEPT
+-A FILTERS -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+-A FILTERS -p tcp -m conntrack --ctstate NEW -m tcp --syn --dport 22 -j ACCEPT 
+-A FILTERS -p tcp -m conntrack --ctstate NEW -m tcp --syn --dport 80 -j ACCEPT
+-A FILTERS -p tcp -m conntrack --ctstate NEW -m tcp --syn --dport 443 -j ACCEPT
+-A FILTERS -p udp -m conntrack --ctstate NEW -m udp --dport 51820 -j ACCEPT
+-A FILTERS -p udp -m conntrack --ctstate NEW -m udp --dport 51821 -j ACCEPT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 1719 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 1720 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 1723 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 5060 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 5061 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 6566 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 8080 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 8443 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 8880 -j REJECT
+-A FILTERS -p tcp -m conntrack --ctstate NEW,RELATED,ESTABLISHED -m tcp --syn --dport 10080 -j REJECT
+-A FILTERS -m conntrack --ctstate INVALID -j DROP
+-A FILTERS -j REJECT
+COMMIT