2022-06-29 14:53:07 +00:00
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#!/usr/bin/nft -f
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flush ruleset
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table inet filter {
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chain prerouting-raw {
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type filter hook prerouting priority raw
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2024-03-23 15:18:02 +00:00
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# drop packets without a reverse path (strict reverse path filtering)
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fib saddr . iif oif missing counter drop
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2022-07-21 21:31:16 +00:00
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iif lo notrack accept
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tcp dport {22, 80, 443} notrack accept
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meta l4proto {icmp, ipv6-icmp} notrack accept
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2022-06-29 14:53:07 +00:00
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}
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chain output-raw {
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type filter hook output priority raw
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2022-07-21 21:31:16 +00:00
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oif lo notrack accept
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tcp sport {22, 80, 443} notrack accept
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meta l4proto {icmp, ipv6-icmp} notrack accept
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2022-06-29 14:53:07 +00:00
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}
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chain input {
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type filter hook input priority filter
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policy drop
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iif lo accept
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2022-07-21 23:30:45 +00:00
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tcp dport {22, 80, 443} ip daddr {{ipv4_address}} accept
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tcp dport {22, 80, 443} ip6 daddr {{ipv6_address}} accept
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2022-07-19 02:14:35 +00:00
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meta l4proto {icmp, ipv6-icmp} accept
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2022-06-29 14:53:07 +00:00
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ct state vmap { invalid : drop, established : accept, related : accept }
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meta l4proto udp reject
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meta l4proto tcp reject with tcp reset
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reject
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}
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chain forward {
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type filter hook forward priority filter
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policy drop
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}
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chain output {
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type filter hook output priority filter
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2022-07-26 00:03:09 +00:00
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oif lo goto output-internal
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2022-08-10 15:13:31 +00:00
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skuid != {root, systemd-network, unbound, chrony, http} counter goto output-reject
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2022-06-30 00:18:51 +00:00
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}
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2022-07-26 00:03:09 +00:00
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chain output-internal {
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skuid unbound meta l4proto {tcp, udp} th sport 53 th dport >= 1024 accept
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2023-02-11 08:18:02 +00:00
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skuid chrony meta l4proto {tcp, udp} th sport >= 1024 th dport 53 accept
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2022-07-26 00:03:09 +00:00
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skuid != root counter goto output-reject
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accept
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}
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2022-06-30 00:18:51 +00:00
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chain output-reject {
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meta l4proto udp reject
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meta l4proto tcp reject with tcp reset
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reject
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2022-06-29 14:53:07 +00:00
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}
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}
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