iptables updated

apt install busybox -y

apt install iptables-persistent netfilter-persistent conntrack nftables -y

systemctl enable netfilter-persistent
systemctl start netfilter-persistent

### 1: Drop invalid packets ###
/sbin/iptables -t mangle -A PREROUTING -m conntrack --ctstate INVALID -j DROP

### 2: Drop TCP packets that are new and are not SYN ###
/sbin/iptables -t mangle -A PREROUTING -p tcp ! --syn -m conntrack --ctstate NEW -j DROP

### 3: Drop SYN packets with suspicious MSS value ###
/sbin/iptables -t mangle -A PREROUTING -p tcp -m conntrack --ctstate NEW -m tcpmss ! --mss 536:65535 -j DROP


### 4: Block packets with bogus TCP flags ###
/sbin/iptables -t mangle -A PREROUTING -p tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
/sbin/iptables -t mangle -A PREROUTING -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
/sbin/iptables -t mangle -A PREROUTING -p tcp --tcp-flags FIN,RST FIN,RST -j DROP
/sbin/iptables -t mangle -A PREROUTING -p tcp --tcp-flags FIN,ACK FIN -j DROP
/sbin/iptables -t mangle -A PREROUTING -p tcp --tcp-flags ACK,URG URG -j DROP
/sbin/iptables -t mangle -A PREROUTING -p tcp --tcp-flags ACK,PSH PSH -j DROP
/sbin/iptables -t mangle -A PREROUTING -p tcp --tcp-flags ALL NONE -j DROP

### 5: Block spoofed packets ###
/sbin/iptables -t mangle -A PREROUTING -s 10.7.0.0/24 -j ACCEPT
/sbin/iptables -t mangle -A PREROUTING -s 103.147.87.0/24 -j ACCEPT
/sbin/iptables -t mangle -A PREROUTING -s 224.0.0.0/3 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 169.254.0.0/16 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 172.16.0.0/12 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 192.0.2.0/24 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 192.168.0.0/16 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 10.0.0.0/8 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 0.0.0.0/8 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 240.0.0.0/5 -j DROP
/sbin/iptables -t mangle -A PREROUTING -s 127.0.0.0/8 ! -i lo -j DROP

### 6: Drop ICMP (you usually don't need this protocol) ###
/sbin/iptables -t mangle -A PREROUTING -p icmp -j DROP

### 7: Drop fragments in all chains ###
/sbin/iptables -t mangle -A PREROUTING -f -j DROP

### 9: Limit RST packets ###
/sbin/iptables -A INPUT -p tcp --tcp-flags RST RST -m limit --limit 2/s --limit-burst 2 -j ACCEPT
/sbin/iptables -A INPUT -p tcp --tcp-flags RST RST -j DROP

### 11: Use SYNPROXY on all ports (disables connection limiting rule) ###
/sbin/iptables -t raw -A PREROUTING -p tcp -m tcp --syn -j CT --notrack
/sbin/iptables -A INPUT -p tcp -m tcp -m conntrack --ctstate INVALID,UNTRACKED -j SYNPROXY --sack-perm --timestamp --wscale 7 --mss 1460
/sbin/iptables -A INPUT -m conntrack --ctstate INVALID -j DROP


### SSH brute-force protection ###
/sbin/iptables -A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW -m recent --set
/sbin/iptables -A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW -m recent --update --seconds 60 --hitcount 10 -j DROP

### Protection against port scanning ###
/sbin/iptables -N port-scanning
/sbin/iptables -A port-scanning -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s --limit-burst 2 -j RETURN
/sbin/iptables -A port-scanning -j DROP

## Drop udp traffic on ssh ##
iptables -A INPUT -p udp --dport 22 -j DROP
iptables -A INPUT -p udp --sport 22 -j DROP

## Drop Udp for Http and Https ##
iptables -A INPUT -p udp --dport 80 -j DROP
iptables -A INPUT -p udp --sport 80 -j DROP
iptables -A INPUT -p udp --dport 443 -j DROP
iptables -A INPUT -p udp --sport 443 -j DROP

# Wireguard
iptables -A INPUT -i wg0 -j ACCEPT
iptables -A INPUT -p tcp --dport 51820 -j DROP
iptables -A INPUT -p tcp --sport 51820 -j DROP

echo 0 > /proc/sys/net/netfilter/nf_conntrack_helper

iptables -A PREROUTING -t raw -m rpfilter --invert -j DROP
ip6tables -A PREROUTING -t raw -m rpfilter --invert -j DROP

#Whitelist SSH
iptables -A INPUT -p tcp --dport 22 -s 10.7.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --sport 22 -s 10.7.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP
iptables -A INPUT -p tcp --sport 22 -j DROP

iptables -A INPUT -p icmp --icmp-type echo-request -j REJECT

iptables -A INPUT -f -j ACCEPT
iptables -A INPUT -p tcp -f -j ACCEPT
iptables -A INPUT -p udp -f -j ACCEPT
iptables -A INPUT -p icmp -f -j ACCEPT

iptables-save > /etc/iptables/rules.v4