2022-06-29 14:53:07 +00:00
|
|
|
#!/usr/bin/nft -f
|
|
|
|
|
|
|
|
flush ruleset
|
|
|
|
|
|
|
|
table inet filter {
|
|
|
|
chain prerouting-raw {
|
|
|
|
type filter hook prerouting priority raw
|
|
|
|
|
2024-03-23 15:18:02 +00:00
|
|
|
# drop packets without a reverse path (strict reverse path filtering)
|
|
|
|
fib saddr . iif oif missing counter drop
|
|
|
|
|
2022-07-21 21:31:16 +00:00
|
|
|
iif lo notrack accept
|
2024-03-24 17:27:55 +00:00
|
|
|
|
|
|
|
# drop packets to address not configured on incoming interface (strong host model)
|
|
|
|
fib daddr . iif type != { local, broadcast, multicast } counter drop
|
|
|
|
|
2024-03-24 19:22:00 +00:00
|
|
|
# reject SSH packets via anycast IP
|
|
|
|
tcp dport 22 ip daddr 198.251.90.93 reject with tcp reset
|
|
|
|
|
2022-07-21 21:31:16 +00:00
|
|
|
udp dport 53 notrack accept
|
2024-01-19 17:51:35 +00:00
|
|
|
tcp dport {22, 53, 80, 443, 853} notrack accept
|
2022-07-21 21:31:16 +00:00
|
|
|
meta l4proto {icmp, ipv6-icmp} notrack accept
|
2022-06-29 14:53:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
chain output-raw {
|
|
|
|
type filter hook output priority raw
|
|
|
|
|
2022-07-21 21:31:16 +00:00
|
|
|
oif lo notrack accept
|
|
|
|
udp sport 53 notrack accept
|
2024-01-19 17:51:35 +00:00
|
|
|
tcp sport {22, 53, 80, 443, 853} notrack accept
|
2022-07-21 21:31:16 +00:00
|
|
|
meta l4proto {icmp, ipv6-icmp} notrack accept
|
2022-06-29 14:53:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
chain input {
|
|
|
|
type filter hook input priority filter
|
|
|
|
policy drop
|
|
|
|
|
|
|
|
iif lo accept
|
2024-03-24 19:22:00 +00:00
|
|
|
udp dport 53 accept
|
|
|
|
tcp dport {22, 53, 80, 443, 853} accept
|
2022-07-19 02:14:35 +00:00
|
|
|
meta l4proto {icmp, ipv6-icmp} accept
|
2022-06-29 14:53:07 +00:00
|
|
|
|
|
|
|
ct state vmap { invalid : drop, established : accept, related : accept }
|
|
|
|
|
|
|
|
meta l4proto udp reject
|
|
|
|
meta l4proto tcp reject with tcp reset
|
|
|
|
reject
|
|
|
|
}
|
|
|
|
|
|
|
|
chain forward {
|
|
|
|
type filter hook forward priority filter
|
|
|
|
policy drop
|
|
|
|
}
|
|
|
|
|
|
|
|
chain output {
|
|
|
|
type filter hook output priority filter
|
|
|
|
|
2022-07-26 00:03:09 +00:00
|
|
|
oif lo goto output-internal
|
2023-11-05 02:16:56 +00:00
|
|
|
skuid != {root, systemd-network, unbound, chrony, http, powerdns, geoipupdate} counter goto output-reject
|
2022-06-30 00:18:51 +00:00
|
|
|
}
|
|
|
|
|
2022-07-26 00:03:09 +00:00
|
|
|
chain output-internal {
|
|
|
|
skuid unbound meta l4proto {tcp, udp} th sport 53 th dport >= 1024 accept
|
2024-01-19 18:44:47 +00:00
|
|
|
skuid {chrony, geoipupdate} meta l4proto {tcp, udp} th sport >= 1024 th dport 53 accept
|
|
|
|
|
|
|
|
skuid powerdns meta l4proto tcp th sport 54 th dport >= 1024 accept
|
|
|
|
skuid http meta l4proto {tcp, udp} th sport >= 1024 th dport 54 accept
|
2022-07-26 00:03:09 +00:00
|
|
|
|
2023-11-05 02:50:37 +00:00
|
|
|
skuid powerdns meta l4proto tcp th sport 81 th dport >= 1024 accept
|
2023-02-14 06:19:19 +00:00
|
|
|
|
2022-07-26 00:03:09 +00:00
|
|
|
skuid != root counter goto output-reject
|
|
|
|
accept
|
|
|
|
}
|
|
|
|
|
2022-06-30 00:18:51 +00:00
|
|
|
chain output-reject {
|
|
|
|
meta l4proto udp reject
|
|
|
|
meta l4proto tcp reject with tcp reset
|
|
|
|
reject
|
2022-06-29 14:53:07 +00:00
|
|
|
}
|
|
|
|
}
|