73 lines
2.1 KiB
Plaintext
73 lines
2.1 KiB
Plaintext
#!/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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iif lo notrack accept
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udp dport 53 notrack accept
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tcp dport {22, 53, 80, 443, 853} notrack accept
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meta l4proto {icmp, ipv6-icmp} notrack accept
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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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oif lo notrack accept
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udp sport 53 notrack accept
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tcp sport {22, 53, 80, 443, 853} notrack accept
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meta l4proto {icmp, ipv6-icmp} notrack accept
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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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udp dport 53 ip daddr {{ipv4_address}} accept
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udp dport 53 ip6 daddr {{ipv6_address}} accept
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tcp dport {22, 53, 80, 443, 853} ip daddr {{ipv4_address}} accept
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tcp dport {22, 53, 80, 443, 853} ip6 daddr {{ipv6_address}} accept
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meta l4proto {icmp, ipv6-icmp} accept
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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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oif lo goto output-internal
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skuid != {root, systemd-network, unbound, chrony, http, powerdns, geoipupdate} counter goto output-reject
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}
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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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skuid {chrony, geoipupdate} meta l4proto {tcp, udp} th sport >= 1024 th dport 53 accept
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skuid powerdns meta l4proto tcp th sport 54 th dport >= 1024 accept
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skuid http meta l4proto {tcp, udp} th sport >= 1024 th dport 54 accept
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skuid powerdns meta l4proto tcp th sport 81 th dport >= 1024 accept
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skuid != root counter goto output-reject
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accept
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}
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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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}
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}
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