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nftables: move rate limit above established connections

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FollieHiyuki 2021-06-26 16:09:26 +03:00
parent f3f1096c3f
commit 84eb287357
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GPG Key ID: 813CF484F4993419
2 changed files with 31 additions and 12 deletions
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1
home/.config/alacritty/alacritty.yml
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@ -2,6 +2,7 @@
env:
TERM: alacritty
# TERM: xterm-256color
window:
padding:

42
system/etc/nftables.conf
View File

@ -1,19 +1,31 @@
#!/sbin/nft -f
# --------------------------------------------------------------------------------- #
# References:
# https://wiki.nftables.org/wiki-nftables/index.php/Main_Page
# https://wiki.gentoo.org/wiki/Nftables/Examples
# https://wiki.archlinux.org/title/Nftables
# https://github.com/krabelize/nftables-firewall-config/blob/master/nftables.conf
# https://github.com/atweiden/archvault/blob/master/resources/etc/nftables.conf
# https://xdeb.org/post/2019/09/26/setting-up-a-server-firewall-with-nftables-that-support-wireguard-vpn/
# Libvirt:
# https://libvirt.org/firewall.html
# Notes:
# - "limit" rules need to be put before "established" connections
# - use sets for groups of things (eg. IP, ports, ...)
# - explicitly allow IPv6 ICMP if do not have "policy accept" on the outgoing chain
# - hook order: ingress -> prerouting -> input/output/forward -> postrouting
# - "iif" should be use when possible (for persistent interfaces) since it is faster than "iifname"
# --------------------------------------------------------------------------------- #
flush ruleset
# TCP ports to accept (both IPv4 and IPv6)
#define ACCEPT_TCP_PORTS = {}
#define ACCEPT_TCP_PORTS = { 80, 443, 1965 }
# UDP ports to accept (both IPv4 and IPv6)
#define ACCEPT_UDP_PORTS = {}
@ -38,23 +50,15 @@ table inet filter {
chain input {
type filter hook input priority 0; policy drop;
# Drop invalid packets early
ct state invalid counter drop
ct state { established, related } counter accept
ct status dnat accept
iif lo accept
iif != lo ip daddr 127.0.0.1/8 counter drop
iif != lo ip6 daddr ::1/128 counter drop
counter jump libvirt_input
# Drop none SYN packets
#tcp flags & (fin|syn|rst|ack) != syn ct state new counter drop
# Reject AUTH to make it fail fast
tcp dport 113 reject with icmpx type port-unreachable
# Accept user-defined ports
#tcp dport $ACCEPT_TCP_PORTS counter accept
#udp dport $ACCEPT_UDP_PORTS counter accept
# Rate limit on SSH port
#tcp dport ssh ct state new limit rate 6/minute accept
@ -62,6 +66,20 @@ table inet filter {
ip protocol icmp icmp type { echo-reply, echo-request } limit rate over 1/second burst 4 packets drop
ip6 nexthdr icmpv6 icmpv6 type { echo-reply, echo-request } limit rate over 1/second burst 4 packets drop
ct state { established, related } counter accept
ct status dnat accept
# Allow loopback from host
iif lo accept
iif != lo ip daddr 127.0.0.1/8 counter drop
iif != lo ip6 daddr ::1/128 counter drop
counter jump libvirt_input
# Accept user-defined ports
#tcp dport $ACCEPT_TCP_PORTS ct state new counter accept
#udp dport $ACCEPT_UDP_PORTS ct state new counter accept
# Accept ICMPv4
ip protocol icmp icmp type {
echo-reply,