mirror of
https://github.com/GrapheneOS/infrastructure.git
synced 2024-10-01 00:55:42 -04:00
b21ea0a23f
Our network servers are spiking over the default burst limit of 5 packets during regular usage. It's unclear high this should be but 5 packets is definitely too low.
138 lines
5.1 KiB
Plaintext
138 lines
5.1 KiB
Plaintext
#!/usr/bin/nft -f
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flush ruleset
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table inet filter {
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define ip-allowlist-ssh = {
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127.0.0.1,
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198.98.53.141, # 0.ns2.grapheneos.org
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}
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define ip6-allowlist-ssh = {
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::1,
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2605:6400:10:102e:95bc:89ef:2e7f:49bb, # 0.ns2.grapheneos.org
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}
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set ip-connlimit-ssh {
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type ipv4_addr
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flags dynamic
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}
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set ip6-connlimit-ssh {
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type ipv6_addr
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flags dynamic
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}
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set ip-connlimit-main {
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type ipv4_addr
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flags dynamic
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}
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set ip6-connlimit-main {
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type ipv6_addr
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flags dynamic
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}
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chain prerouting-raw {
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type filter hook prerouting priority raw
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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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iif lo notrack accept
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# drop packets to address not configured on incoming interface (strong host model)
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fib daddr . iif type != { local, broadcast, multicast } counter drop
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# reject SSH packets via anycast IP
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tcp dport 22 ip daddr 198.251.90.93 reject with tcp reset
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udp dport 53 notrack accept
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tcp dport { 22, 53, 80, 443, 853 } tcp flags syn limit rate 1024/second burst 128 packets accept
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tcp dport { 22, 53, 80, 443, 853 } tcp flags syn counter 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 goto input-loopback
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udp dport 53 accept
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meta l4proto { icmp, ipv6-icmp } accept
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ct state vmap { new : goto input-new, established : goto input-established, related : accept }
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tcp dport 22 ip saddr @ip-connlimit-ssh counter reject with tcp reset
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tcp dport 22 ip6 saddr and ffff:ffff:ffff:ffff:ffff:: @ip6-connlimit-ssh counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } ip saddr @ip-connlimit-main counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } ip6 saddr and ffff:ffff:ffff:ffff:: @ip6-connlimit-main counter reject with tcp reset
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tcp dport { 22, 53, 80, 443, 853 } synproxy mss 1460 wscale 7 timestamp sack-perm
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}
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chain input-new {
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tcp dport != { 22, 53, 80, 443, 853 } goto graceful-reject
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tcp dport 22 ip saddr @ip-connlimit-ssh counter reject with tcp reset
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tcp dport 22 ip6 saddr and ffff:ffff:ffff:ffff:ffff:: @ip6-connlimit-ssh counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } ip saddr @ip-connlimit-main counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } ip6 saddr and ffff:ffff:ffff:ffff:: @ip6-connlimit-main counter reject with tcp reset
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accept
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}
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chain input-established {
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ct mark 0x1 accept
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tcp dport 22 ip saddr != $ip-allowlist-ssh add @ip-connlimit-ssh { ip saddr ct count over 1 } counter reject with tcp reset
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tcp dport 22 ip6 saddr != $ip6-allowlist-ssh add @ip6-connlimit-ssh { ip6 saddr and ffff:ffff:ffff:ffff:ffff:: ct count over 1 } counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } add @ip-connlimit-main { ip saddr ct count over 16 } counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } add @ip6-connlimit-main { ip6 saddr and ffff:ffff:ffff:ffff:: ct count over 16 } counter reject with tcp reset
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ct mark set 0x1 accept
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}
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chain input-loopback {
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tcp flags != syn accept
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tcp dport 22 ip saddr != $ip-allowlist-ssh add @ip-connlimit-ssh { ip saddr ct count over 1 } counter reject with tcp reset
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tcp dport 22 ip6 saddr != $ip6-allowlist-ssh add @ip6-connlimit-ssh { ip6 saddr and ffff:ffff:ffff:ffff:ffff:: ct count over 1 } counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } add @ip-connlimit-main { ip saddr ct count over 16 } counter reject with tcp reset
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tcp dport { 53, 80, 443, 853 } add @ip6-connlimit-main { ip6 saddr and ffff:ffff:ffff:ffff:: ct count over 16 } counter reject with tcp reset
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ct mark set 0x1 accept
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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-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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meta l4proto { icmp, ipv6-icmp } notrack accept
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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-loopback
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skuid != { root, systemd-network, unbound, chrony, http, powerdns, geoipupdate } counter goto graceful-reject
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}
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chain output-loopback {
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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 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 graceful-reject
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accept
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}
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chain graceful-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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