111 lines
4 KiB
Text
111 lines
4 KiB
Text
#!/usr/sbin/nft -f
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## Variables
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# Hosts
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# Interfaces
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define if_netwan = "netwan"
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define if_netlan = "netlan"
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define if_wg55_management = "wg55"
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define if_netwan_400_fux_uplink = "netwan.400"
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define if_netlan_51_clients = "netlan.51"
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define if_netlan_52_iot = "netlan.52"
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define if_netlan_53_public = "netlan.53"
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define if_netlan_54_management = "netlan.54"
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# Interface Groups
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define wan_ifs = { $if_netwan_400_fux_uplink }
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define lan_ifs = { $if_netlan_51_clients,
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$if_netlan_52_iot,
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$if_netlan_53_public,
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$if_netlan_54_management }
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define v4_exposed_ifs = { $if_netlan_53_public }
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define v6_exposed_ifs = { $if_netlan_53_public }
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define v4_nat_ifs = { $if_netlan_51_clients,
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$if_netlan_52_iot,
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$if_netlan_54_management }
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## Rules
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table inet reverse-path-forwarding {
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chain rpf-filter {
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type filter hook prerouting priority mangle + 10; policy drop;
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# Only allow packets if their source address is routed via their incoming interface.
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# https://github.com/NixOS/nixpkgs/blob/d9d87c51960050e89c79e4025082ed965e770d68/nixos/modules/services/networking/firewall-nftables.nix#L100
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fib saddr . mark . iif oif exists accept
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}
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}
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table inet host {
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chain input {
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type filter hook input priority filter; policy drop;
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iifname "lo" accept comment "allow loopback"
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ct state invalid drop
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ct state established,related accept
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ip protocol icmp accept
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# ICMPv6
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# https://datatracker.ietf.org/doc/html/rfc4890#autoid-24
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# Allowlist consisting of: "Traffic That Must Not Be Dropped" and "Traffic That Normally Should Not Be Dropped"
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# Error messages that are essential to the establishment and maintenance of communications:
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icmpv6 type { destination-unreachable, packet-too-big } accept
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icmpv6 type { time-exceeded } accept
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icmpv6 type { parameter-problem } accept
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# Connectivity checking messages:
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icmpv6 type { echo-request, echo-reply } accept
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# Address Configuration and Router Selection messages:
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icmpv6 type { nd-router-solicit, nd-router-advert, nd-neighbor-solicit, nd-neighbor-advert, ind-neighbor-solicit, ind-neighbor-advert } accept
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# Link-Local Multicast Receiver Notification messages:
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icmpv6 type { mld-listener-query, mld-listener-report, mld-listener-done, mld2-listener-report } accept
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# SEND Certificate Path Notification messages:
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icmpv6 type { 148, 149 } accept
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# Multicast Router Discovery messages:
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icmpv6 type { 151, 152, 153 } accept
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# Allow SSH access.
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tcp dport 22 accept comment "allow ssh access"
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# Allow WireGuard access.
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udp dport 51820 accept comment "allow WireGuard access"
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# Allow DHCP server access.
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iifname { $lan_ifs } udp dport 67 accept comment "allow dhcp server access"
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}
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}
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table ip v4nat {
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chain prerouting {
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type nat hook prerouting priority dstnat; policy accept;
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}
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chain postrouting {
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type nat hook postrouting priority srcnat; policy accept;
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iifname { $v4_nat_ifs, $if_wg55_management } oifname $wan_ifs masquerade
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}
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}
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table inet forward {
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chain forward {
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type filter hook forward priority filter; policy drop;
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ct state invalid drop
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ct state established,related accept
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# Allow internet access.
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iifname { $lan_ifs, $if_wg55_management } oifname $wan_ifs accept comment "allow internet access"
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# Allow access to exposed networks from internet.
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meta nfproto ipv4 oifname $v4_exposed_ifs accept comment "allow v4 exposed network access"
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meta nfproto ipv6 oifname $v6_exposed_ifs accept comment "allow v6 exposed network access"
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# Allow clients and managment to most
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iifname { $if_netlan_51_clients, $if_netlan_54_management, $if_wg55_management } oifname $lan_ifs accept comment "allow clients and managment to lan_ifs"
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}
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}
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