82 lines
2.3 KiB
Plaintext
82 lines
2.3 KiB
Plaintext
#!/sbin/nft -f
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# References
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# https://wiki.gentoo.org/wiki/Nftables/Examples
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# https://wiki.archlinux.org/title/Nftables
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# https://github.com/krabelize/nftables-firewall-config/blob/master/nftables.conf
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# https://github.com/atweiden/archvault/blob/master/resources/etc/nftables.conf
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flush ruleset
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# TCP ports to accept (both IPv4 and IPv6)
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#define ACCEPT_TCP_PORTS = {}
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# UDP ports to accept (both IPv4 and IPv6)
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#define ACCEPT_UDP_PORTS = {}
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table inet filter {
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# Default to drop all inbound traffic, unless they meet our criteria
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chain input {
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type filter hook input priority 0; policy drop;
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ct state invalid counter drop
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ct state {established,related} counter accept
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iif lo accept
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iif != lo ip daddr 127.0.0.1/8 counter drop
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iif != lo ip6 daddr ::1/128 counter drop
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# Accept user-defined ports
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#tcp dport $ACCEPT_TCP_PORTS counter accept
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#udp dport $ACCEPT_UDP_PORTS counter accept
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# Rate limit on SSH port
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#tcp dport ssh ct state new limit rate 6/minute accept
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# Mitigate ping floods
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ip protocol icmp icmp type {echo-reply, echo-request} limit rate over 1/second burst 4 packets drop
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ip6 nexthdr icmpv6 icmpv6 type {echo-reply, echo-request} limit rate over 1/second burst 4 packets drop
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ip protocol icmp icmp type {
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echo-reply,
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echo-request,
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destination-unreachable,
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time-exceeded,
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parameter-problem,
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router-advertisement,
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router-solicitation
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} counter accept
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ip6 nexthdr icmpv6 icmpv6 type {
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echo-reply,
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echo-request,
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destination-unreachable,
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mld-listener-query,
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mld-listener-reduction,
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mld-listener-report,
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mld2-listener-report,
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packet-too-big,
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time-exceeded,
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parameter-problem
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} counter accept
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counter comment "Count dropped packets"
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#log prefix "[nftables] Inbound Denied: " flags all counter drop
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}
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# Route your own packets! I'm not your router.
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# Can be enabled while using VPN (for tunneling)
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chain forward {
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type filter hook forward priority 0; policy drop;
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counter comment "Count dropped packets"
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#log prefix "[nftables] Forward Denied: " flags all counter drop
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}
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# Accept all outbound traffic
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chain output {
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type filter hook output priority 0; policy accept;
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counter comment "Count accepted packets"
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#log prefix "[nftables] Outbound Accepted: " flags all counter accpet
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}
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}
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