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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/.
# references, some codes from:
# https://wiki.archlinux.org/title/Nftables
# https://www.procustodibus.com/blog/2021/11/wireguard-nftables
# https://wiki.gentoo.org/wiki/Nftables/Examples#Basic_NAT
# needed for reload config using `sudo systemctl restart nftables` or `sudo nft -f /etc/nftables.conf`
flush ruleset
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"
ip protocol icmp accept
meta l4proto ipv6-icmp accept
tcp dport ssh accept
#tcp dport qbt-nox accept
tcp dport qbt accept
udp dport qbt accept
#tcp dport iperf3 accept
# for acme.sh standalone mode builtin webserver to renew ssl cert
tcp dport http 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.
}
chain my_output {
type filter hook output priority filter
policy accept
# Accept every outbound connection
}
}
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