66 lines
2.4 KiB
Bash
66 lines
2.4 KiB
Bash
#!/usr/bin/env bash
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# Clears the old iptables rules and sets new ones to only allow SSH & I2NP traffic (+ ICMP pings)
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sudo apt update && sudo apt install iptables iptables-persistent -y
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read -p "[?] Confirm the deletion of old iptables rules: " -n 1 -r
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! [[ "$REPLY" =~ ^[Yy]$ ]] && echo -e "\n[!] Aborting..." && exit 0
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! [ -f ".env" ] && echo "[!] The .env file not found, aborting..." && exit 1
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set -a
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source .env
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set +a
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[ -z ${EXT_PORT} ] && echo "[!] EXT_PORT is not configured, aborting..." && exit 1
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# Clear all old rules (IPv4)
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sudo iptables -P INPUT ACCEPT
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sudo iptables -P FORWARD ACCEPT
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sudo iptables -P OUTPUT ACCEPT
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sudo iptables -t nat -F
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sudo iptables -t mangle -F
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sudo iptables -F
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sudo iptables -X
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# Clear all old rules (IPv6)
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sudo ip6tables -P INPUT ACCEPT
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sudo ip6tables -P FORWARD ACCEPT
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sudo ip6tables -P OUTPUT ACCEPT
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sudo ip6tables -t nat -F
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sudo ip6tables -t mangle -F
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sudo ip6tables -F
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sudo ip6tables -X
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# Allow all incoming SSH traffic (tcp:22)
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sudo iptables -A INPUT -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
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sudo ip6tables -A INPUT -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
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# Allow all I2NP traffic (tcp:$EXT_PORT, udp:$EXT_PORT)
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# Not using `--state NEW,ESTABLISHED` guarantees that **all** incoming and outgoing traffic is let through
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sudo iptables -A INPUT -p tcp --dport $EXT_PORT -j ACCEPT
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sudo ip6tables -A INPUT -p tcp --dport $EXT_PORT -j ACCEPT
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sudo iptables -A INPUT -p udp --dport $EXT_PORT -j ACCEPT
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sudo ip6tables -A INPUT -p udp --dport $EXT_PORT -j ACCEPT
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# Allow all incoming ICMP echo requests (pings)
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sudo iptables -A INPUT -p icmp --icmp-type echo-request -m state --state NEW,ESTABLISHED -j ACCEPT
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# Allow all ICMP traffic via IPv6 (ICMPv6 is essential for IPv6 to function)
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sudo ip6tables -A INPUT -p ipv6-icmp -j ACCEPT
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# Allow all related and established incoming traffic (i.e. allow responses to outgoing requests initiated by the local system)
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sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
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sudo ip6tables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
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# Reject all other incoming traffic with DROP (DROP doesn't provide information about
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# the host configuration to potential attackers like REJECT would, which is why it's used)
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sudo iptables -A INPUT -j DROP
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sudo ip6tables -A INPUT -j DROP
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# Persist changes
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sudo iptables-save | sudo tee /etc/iptables/rules.v4
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sudo ip6tables-save | sudo tee /etc/iptables/rules.v6
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