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#!/usr/bin/nft -f
# IPv4/IPv6 Simple & Safe firewall ruleset.
# More examples in /usr/share/nftables/ and /usr/share/doc/nftables/examples/.
# some codes from https://wiki.archlinux.org/title/Nftables
# needed for reload config using `sudo systemctl restart nftables` or `sudo nft -f /etc/nftables.conf`
flush ruleset
define pub_iface = "eth0"
define wg_iface = "wg0"
table inet my_table {
chain my_input {
type filter hook input priority filter
policy drop
ct state invalid drop comment "early drop of invalid connections"
ct state {established, related} accept comment "allow tracked connections"
iifname lo accept comment "allow from loopback"
iifname $wg_iface ip saddr 10.0.0.1 accept comment "allow from wireguard insp ip"
iifname $wg_iface ip6 saddr fdc9:281f:04d7:9ee9::1 accept comment "allow from wireguard insp ip"
ip protocol icmp accept
meta l4proto ipv6-icmp accept
tcp dport ssh accept
#tcp dport iperf3 accept
udp dport wireguard accept
tcp dport http accept
tcp dport https accept
# http3 quic
# seems no need open port 80 udp for http3, see https://serverfault.com/q/1185886
udp dport https accept
# email related ports
tcp dport smtp accept
#tcp dport pop3 accept
tcp dport imap accept
tcp dport submissions accept
tcp dport submission accept
tcp dport imaps accept
#tcp dport pop3s accept
pkttype host limit rate 5/second counter reject with icmpx type admin-prohibited
counter comment "count any other traffic"
}
chain my_forward {
type filter hook forward priority filter
policy drop
# Drop everything forwarded to us. We do not forward. That is routers job.
# needed for wireguard?
#iifname $wg_iface oifname $pub_iface accept
#iifname $pub_iface oifname $wg_iface accept
iifname $wg_iface accept
oifname $wg_iface accept
}
chain my_output {
type filter hook output priority filter
policy accept
# Accept every outbound connection
}
}
# needed to wireguard NAT masquerade VPN traffic
# Need inet to masquerade both ipv4 and ipv6? If use ip it will only masquerade ipv4? If use ip6 it will only masquerade ipv6?
# https://wiki.nftables.org/wiki-nftables/index.php/Nftables_families
table inet nat {
# newer kernel no need for `chain prerouting { type nat hook prerouting priority -100; policy accept; }` if has `chain postrouting`
# also vice versa, no need `chain postrouting` if has `chain prerouting`
# more see https://www.procustodibus.com/blog/2021/11/wireguard-nftables/
# for all packets to $pub_iface, after routing, replace source address with primary IP of $pub_iface interface
chain postrouting {
type nat hook postrouting priority 100
policy accept
# Needed for VPN. Needed for port forwarding from cilent with VPN through server
# https://www.procustodibus.com/blog/2022/09/wireguard-port-forward-from-internet/#default-route
oifname $pub_iface masquerade
}
}
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