DigitalOcean IPTables

iptables

*nat
:PREROUTING ACCEPT [235:14024]
:INPUT ACCEPT [235:14024]
:OUTPUT ACCEPT [418:29744]
:POSTROUTING ACCEPT [418:29744]
COMMIT
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [229:47805]
-A INPUT -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p udp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -m state --state INVALID -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,ACK FIN -j LOG --log-prefix "FIN: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,ACK FIN -j DROP
-A INPUT -p tcp -m tcp --tcp-flags PSH,ACK PSH -j LOG --log-prefix "PSH: "
-A INPUT -p tcp -m tcp --tcp-flags PSH,ACK PSH -j DROP
-A INPUT -p tcp -m tcp --tcp-flags ACK,URG URG -j LOG --log-prefix "URG: "
-A INPUT -p tcp -m tcp --tcp-flags ACK,URG URG -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j LOG --log-prefix "XMAS scan: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j LOG --log-prefix "NULL scan: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,ACK,URG -j LOG --log-prefix "pscan: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,ACK,URG -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j LOG --log-prefix "pscan 2: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,RST FIN,RST -j LOG --log-prefix "pscan 2: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,RST FIN,RST -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN -j LOG --log-prefix "SYNFIN-SCAN: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j LOG --log-prefix "NMAP-XMAS-SCAN: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN -j LOG --log-prefix "FIN-SCAN: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,PSH,URG -j LOG --log-prefix "NMAP-ID: "
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,PSH,URG -j DROP
-A INPUT -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j LOG --log-prefix "SYN-RST: "
-A INPUT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j DROP
-A INPUT -f -j DROP
-A INPUT -p tcp -m tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -m limit --limit 25/min --limit-burst 100 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 8080 -m state --state NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 8080 -m limit --limit 25/min --limit-burst 100 -j ACCEPT
-A INPUT -p udp -m udp --dport 520 -j REJECT --reject-with icmp-port-unreachable
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --set --name SSH --mask 255.255.255.255 --rsource -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -m recent --update --seconds 60 --hitcount 4 --rttl --name SSH --mask 255.255.255.255 --rsource -j LOG --log-prefix "SSH_brute_force "
-A INPUT -p tcp -m tcp --dport 22 -m recent --update --seconds 60 --hitcount 4 --rttl --name SSH --mask 255.255.255.255 --rsource -j DROP
-A INPUT -s 10.0.0.0/8 -j DROP
-A INPUT -s 169.254.0.0/16 -j DROP
-A INPUT -s 172.16.0.0/12 -j DROP
-A INPUT -s 127.0.0.0/8 -j DROP
-A INPUT -s 224.0.0.0/4 -j DROP
-A INPUT -d 224.0.0.0/4 -j DROP
-A INPUT -s 240.0.0.0/5 -j DROP
-A INPUT -d 240.0.0.0/5 -j DROP
-A INPUT -s 0.0.0.0/8 -j DROP
-A INPUT -d 0.0.0.0/8 -j DROP
-A INPUT -d 239.255.255.0/24 -j DROP
-A INPUT -d 255.255.255.255/32 -j DROP
-A INPUT -s 172.16.0.0/12 -j LOG --log-prefix "IP DROP SPOOF B: "
-A INPUT -s 240.0.0.0/5 -j LOG --log-prefix "IP DROP SPOOF E: "
-A INPUT -d 127.0.0.0/8 -j LOG --log-prefix "IP DROP LOOPBACK: "
-A OUTPUT -p tcp -m tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 8080 -m state --state ESTABLISHED -j ACCEPT
COMMIT