graphene-os-server-infrastr.../nftables-attestation.conf
2024-03-24 15:22:00 -04:00

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#!/usr/bin/nft -f
flush ruleset
table inet filter {
chain prerouting-raw {
type filter hook prerouting priority raw
# drop packets without a reverse path (strict reverse path filtering)
fib saddr . iif oif missing counter drop
iif lo notrack accept
# drop packets to address not configured on incoming interface (strong host model)
fib daddr . iif type != { local, broadcast, multicast } counter drop
tcp dport {22, 80, 443} notrack accept
meta l4proto {icmp, ipv6-icmp} notrack accept
}
chain output-raw {
type filter hook output priority raw
oif lo notrack accept
tcp sport {22, 80, 443} notrack accept
meta l4proto {icmp, ipv6-icmp} notrack accept
}
chain input {
type filter hook input priority filter
policy drop
iif lo accept
tcp dport {22, 80, 443} accept
meta l4proto {icmp, ipv6-icmp} accept
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
oif lo goto output-internal
skuid != {root, systemd-network, unbound, chrony, http, attestation} counter goto output-reject
}
chain output-internal {
skuid unbound meta l4proto {tcp, udp} th sport 53 th dport >= 1024 th dport != 8080 accept
skuid {chrony, attestation} meta l4proto {tcp, udp} th sport >= 1024 th sport != 8080 th dport 53 accept
skuid attestation tcp sport 8080 tcp dport >= 1024 tcp dport != 8080 accept
skuid http tcp sport >= 1024 tcp sport != 8080 tcp dport 8080 accept
skuid != root counter goto output-reject
accept
}
chain output-reject {
meta l4proto udp reject
meta l4proto tcp reject with tcp reset
reject
}
}