451 lines
14 KiB
Nix
451 lines
14 KiB
Nix
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{
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config,
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lib,
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...
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}:
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let
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cfg = config.lyte.router;
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in
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{
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options.lyte.router = {
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enable = lib.mkEnableOption "Enable home router functionality";
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hostname = lib.mkOption {
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default = "router";
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description = "The hostname of the router. NOT the FQDN. This value concatenated with the domain will form the FQDN of this router host.";
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type = lib.types.str;
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example = "my-home-router";
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};
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domain = lib.mkOption {
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# default = null;
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description = "The domain of the router.";
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type = lib.types.str;
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example = "lan";
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};
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/*
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hosts = {
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dragon = {
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ip = "192.168.0.10";
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};
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bald = {
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ip = "192.168.0.11";
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additionalHosts = [
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"ourcraft.lyte.dev"
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];
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};
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beefcake = {
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ip = "192.168.0.9";
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additionalHosts = [
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".beefcake.lan"
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"a.lyte.dev"
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"atuin.h.lyte.dev"
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"audio.lyte.dev"
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"bw.lyte.dev"
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"files.lyte.dev"
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"finances.h.lyte.dev"
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"git.lyte.dev"
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"grafana.h.lyte.dev"
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"idm.h.lyte.dev"
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"matrix.lyte.dev"
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"nextcloud.h.lyte.dev"
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"nix.h.lyte.dev"
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"onlyoffice.h.lyte.dev"
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"paperless.h.lyte.dev"
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"prometheus.h.lyte.dev"
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"video.lyte.dev"
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"vpn.h.lyte.dev"
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];
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};
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};
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*/
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hosts = lib.mkOption {
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};
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interfaces = {
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wan = {
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name = lib.mkOption {
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default = "wan";
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type = lib.types.str;
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};
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mac = lib.mkOption {
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type = lib.types.str;
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};
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};
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lan = {
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name = lib.mkOption {
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default = "lan";
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type = lib.types.str;
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};
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mac = lib.mkOption {
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type = lib.types.str;
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};
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};
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};
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# TODO: would be nice to support multiple VLANs?
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ipv4 = {
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address = lib.mkOption {
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default = "192.168.0.1";
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description = "The IPv4 address of the router.";
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type = lib.types.str;
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example = "10.0.0.1";
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};
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cidr = lib.mkOption {
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# TODO: derive IPv4 from CIDR?
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description = ''The CIDR to route. If null, will use "''${config.lyte.router.ipv4}/16".'';
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default = null;
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example = "10.0.0.0/8";
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# type = lib.types.str;
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defaultText = ''''${config.lyte.router.ipv4}/16'';
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};
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netmask = lib.mkOption {
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# TODO: derive from CIDR?
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default = "255.255.255.0";
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type = lib.types.str;
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};
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dhcp-lease-space = {
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min = lib.mkOption {
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default = "192.168.0.30";
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type = lib.types.str;
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};
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max = lib.mkOption {
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default = "192.168.0.250";
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type = lib.types.str;
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};
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};
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};
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};
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config = lib.mkIf cfg.enable (
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let
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cidr = lib.defaultTo "${cfg.ipv4.address}/16" cfg.ipv4.cidr;
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wan = cfg.interfaces.wan.name;
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lan = cfg.interfaces.lan.name;
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in
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{
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boot.kernel.sysctl = {
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"net.ipv4.conf.all.forwarding" = true;
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"net.ipv6.conf.all.forwarding" = true;
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"net.ipv4.conf.default.rp_filter" = 1;
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"net.ipv4.conf.${cfg.interfaces.wan.name}.rp_filter" = 1;
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"net.ipv4.conf.${cfg.interfaces.lan.name}.rp_filter" = 0;
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"net.ipv6.conf.${cfg.interfaces.wan.name}.accept_ra" = 2;
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"net.ipv6.conf.${cfg.interfaces.wan.name}.autoconf" = 1;
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"net.ipv6.conf.all.use_tempaddr" = 2;
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"net.ipv6.conf.default.use_tempaddr" = lib.mkForce 2;
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"net.ipv6.conf.${cfg.interfaces.wan.name}.use_tempaddr" = 2;
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# "net.ipv6.conf.${interfaces.wan.name}.addr_gen_mode" = 2;
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};
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networking = {
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hostName = cfg.hostname;
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# disable some of the sane defaults
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# TODO: detect conflicts with NixOS firewall options? this may be done for us?
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useDHCP = false;
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firewall.enable = false;
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# use systemd.network for network interface configuration
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useNetworkd = true;
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# maybe we need this?
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nat.enable = true;
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extraHosts = ''
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127.0.0.1 localhost
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127.0.0.2 ${cfg.hostname}.${cfg.domain} ${cfg.hostname}
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${cfg.ipv4.address} ${cfg.hostname}.${cfg.domain} ${cfg.hostname}
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::1 localhost ip6-localhost ip6-loopback
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ff02::1 ip6-allnodes
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ff02::2 ip6-allrouters
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'';
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nftables = {
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enable = true;
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checkRuleset = true;
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flushRuleset = true;
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ruleset = ''
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table inet filter {
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## set LANv4 {
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## type ipv4_addr
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## flags interval
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## elements = { 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16 }
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## }
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## set LANv6 {
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## type ipv6_addr
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## flags interval
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## elements = { fd00::/8, fe80::/10 }
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## }
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## TODO: maybe tailnet?
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## chain my_input_lan {
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## udp sport 1900 udp dport >= 1024 meta pkttype unicast limit rate 4/second burst 20 packets accept comment "Accept UPnP IGD port mapping reply"
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## udp sport netbios-ns udp dport >= 1024 meta pkttype unicast accept comment "Accept Samba Workgroup browsing replies"
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## }
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chain input {
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type filter hook input priority 0; policy drop;
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iif lo accept comment "Accept any localhost traffic"
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ct state invalid drop comment "Drop invalid connections"
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ct state established,related accept comment "Accept traffic originated from us"
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meta l4proto ipv6-icmp accept comment "Accept ICMPv6"
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meta l4proto icmp accept comment "Accept ICMP"
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ip protocol igmp accept comment "Accept IGMP"
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ip6 nexthdr icmpv6 icmpv6 type nd-router-solicit accept
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ip6 nexthdr icmpv6 icmpv6 type nd-router-advert accept comment "Accept IPv6 router advertisements"
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udp dport dhcpv6-client accept comment "IPv6 DHCP"
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ip6 nexthdr icmpv6 icmpv6 type { echo-request, nd-neighbor-solicit, nd-neighbor-advert, nd-router-solicit, nd-router-advert, mld-listener-query, destination-unreachable, packet-too-big, time-exceeded, parameter-problem } accept comment "Accept IPv6 ICMP and meta stuff"
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ip protocol icmp icmp type { echo-request, destination-unreachable, router-advertisement, time-exceeded, parameter-problem } accept comment "Accept IPv4 ICMP and meta stuff"
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ip protocol icmpv6 accept
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ip protocol icmp accept
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meta l4proto ipv6-icmp counter accept
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udp dport dhcpv6-client counter accept
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udp dport mdns ip6 daddr ff02::fb accept comment "Accept mDNS"
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udp dport mdns ip daddr 224.0.0.251 accept comment "Accept mDNS"
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tcp dport 2201 accept comment "Accept SSH on port 2201"
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tcp dport 53 accept comment "Accept DNS"
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udp dport 53 accept comment "Accept DNS"
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tcp dport { 80, 443 } accept comment "Allow HTTP/HTTPS to server (see nat prerouting)"
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udp dport { 80, 443 } accept comment "Allow QUIC to server (see nat prerouting)"
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tcp dport { 22 } accept comment "Allow SSH to server (see nat prerouting)"
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tcp dport { 25565 } accept comment "Allow Minecraft server connections (see nat prerouting)"
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udp dport { 34197 } accept comment "Allow Factorio server connections (see nat prerouting)"
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iifname "${lan}" accept comment "Allow local network to access the router"
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iifname "tailscale0" accept comment "Allow local network to access the router"
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## ip6 saddr @LANv6 jump my_input_lan comment "Connections from private IP address ranges"
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## ip saddr @LANv4 jump my_input_lan comment "Connections from private IP address ranges"
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iifname "${wan}" counter drop comment "Drop all other unsolicited traffic from wan"
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}
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chain output {
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type filter hook output priority 0;
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accept
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}
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chain forward {
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type filter hook forward priority 0;
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accept
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}
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## chain forward {
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## type filter hook forward priority filter; policy drop;
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## iifname { "${lan}" } oifname { "${wan}" } accept comment "Allow trusted LAN to WAN"
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## iifname { "tailscale0" } oifname { "${wan}" } accept comment "Allow trusted LAN to WAN"
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## iifname { "${wan}" } oifname { "${lan}" } ct state { established, related } accept comment "Allow established back to LAN"
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## }
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}
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table ip nat {
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chain prerouting {
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type nat hook prerouting priority dstnat;
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iifname ${lan} accept
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iifname tailscale0 accept
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iifname ${wan} tcp dport {22} dnat to ${cfg.hosts.beefcake.ip}
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iifname ${wan} tcp dport {80, 443} dnat to ${cfg.hosts.beefcake.ip}
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iifname ${wan} udp dport {80, 443} dnat to ${cfg.hosts.beefcake.ip}
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iifname ${wan} tcp dport {26966} dnat to ${cfg.hosts.beefcake.ip}
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iifname ${wan} tcp dport {25565} dnat to ${cfg.hosts.bald.ip}
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iifname ${wan} udp dport {25565} dnat to ${cfg.hosts.bald.ip}
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iifname ${wan} udp dport {34197} dnat to ${cfg.hosts.beefcake.ip}
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}
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chain postrouting {
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type nat hook postrouting priority 100; policy accept;
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oifname "${wan}" masquerade
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}
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}
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'';
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};
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};
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systemd.network = {
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enable = true;
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# wait-online.anyInterface = true;
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# configure known names for the network interfaces by their mac addresses
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links = {
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"20-${wan}" = {
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enable = true;
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matchConfig = {
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MACAddress = cfg.interfaces.wan.mac;
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};
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linkConfig = {
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Name = cfg.interfaces.wan.name;
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};
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};
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"30-${lan}" = {
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enable = true;
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matchConfig = {
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MACAddress = cfg.interfaces.lan.mac;
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};
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linkConfig = {
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Name = cfg.interfaces.lan.name;
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};
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};
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};
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# configure networks for the interfaces
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networks = {
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# LAN configuration is very simple and mostly forwarded between
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# TODO: IPv6
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"50-${lan}" = {
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matchConfig.Name = "${lan}";
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linkConfig = {
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RequiredForOnline = "enslaved";
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};
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address = [
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cidr
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];
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networkConfig = {
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ConfigureWithoutCarrier = true;
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IPv6SendRA = true;
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DHCPPrefixDelegation = true;
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};
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};
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/*
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WAN configuration requires DHCP to get addresses
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we also disable some options to be certain we retain as much networking
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control as we reasonably can, such as not letting the ISP determine our
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hostname or DNS configuration
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*/
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# TODO: IPv6 (prefix delegation)
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"40-${wan}" = {
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matchConfig.Name = "${wan}";
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networkConfig = {
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DHCP = true;
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/*
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IPv6AcceptRA = true;
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IPv6PrivacyExtensions = true;
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IPForward = true;
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*/
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};
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dhcpV6Config = {
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/*
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ForceDHCPv6PDOtherInformation = true;
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UseHostname = false;
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UseDNS = false;
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UseNTP = false;
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*/
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# PrefixDelegationHint = "::/56";
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};
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dhcpV4Config = {
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Hostname = cfg.hostname;
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# ignore many things our ISP may suggest
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UseHostname = false;
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UseDNS = false;
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UseNTP = false;
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UseSIP = false;
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UseRoutes = false;
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UseGateway = true;
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};
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linkConfig = {
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RequiredForOnline = "routable";
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# Name = interfaces.wan.name;
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};
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ipv6AcceptRAConfig = {
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DHCPv6Client = "always";
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UseDNS = false;
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};
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};
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};
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};
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services.resolved.enable = false;
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services.fail2ban.enable = true;
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|
|
services.dnsmasq = {
|
||
|
|
enable = true;
|
||
|
|
settings = {
|
||
|
|
listen-address = "::,127.0.0.1,${cfg.ipv4.address}";
|
||
|
|
port = 53;
|
||
|
|
|
||
|
|
/*
|
||
|
|
dhcp-authoritative = true;
|
||
|
|
dnssec = true;
|
||
|
|
*/
|
||
|
|
enable-ra = true;
|
||
|
|
|
||
|
|
server = [
|
||
|
|
"1.1.1.1"
|
||
|
|
"9.9.9.9"
|
||
|
|
"8.8.8.8"
|
||
|
|
];
|
||
|
|
|
||
|
|
domain-needed = true;
|
||
|
|
bogus-priv = true;
|
||
|
|
no-resolv = true;
|
||
|
|
|
||
|
|
cache-size = "10000";
|
||
|
|
|
||
|
|
dhcp-range = with cfg.ipv4.dhcp-lease-space; [
|
||
|
|
"${lan},${min},${max},${cfg.ipv4.netmask},24h"
|
||
|
|
"::,constructor:${lan},ra-stateless,ra-names,4h"
|
||
|
|
];
|
||
|
|
except-interface = wan;
|
||
|
|
interface = lan;
|
||
|
|
dhcp-host =
|
||
|
|
[
|
||
|
|
]
|
||
|
|
++ (lib.attrsets.mapAttrsToList (
|
||
|
|
name:
|
||
|
|
{
|
||
|
|
ip,
|
||
|
|
identifier ? name,
|
||
|
|
time ? "12h",
|
||
|
|
...
|
||
|
|
}:
|
||
|
|
"${name},${ip},${identifier},${time}"
|
||
|
|
) cfg.hosts);
|
||
|
|
|
||
|
|
address =
|
||
|
|
[
|
||
|
|
"/${cfg.hostname}.${cfg.domain}/${cfg.ipv4.address}"
|
||
|
|
]
|
||
|
|
++ (lib.lists.flatten (
|
||
|
|
lib.attrsets.mapAttrsToList (
|
||
|
|
name:
|
||
|
|
{
|
||
|
|
ip,
|
||
|
|
additionalHosts ? [ ],
|
||
|
|
identifier ? name,
|
||
|
|
time ? "12h",
|
||
|
|
}:
|
||
|
|
[
|
||
|
|
"/${name}.${cfg.domain}/${ip}"
|
||
|
|
(lib.lists.forEach additionalHosts (h: "/${h}/${ip}"))
|
||
|
|
]
|
||
|
|
) cfg.hosts
|
||
|
|
));
|
||
|
|
|
||
|
|
# local domains
|
||
|
|
local = "/lan/";
|
||
|
|
domain = "lan";
|
||
|
|
expand-hosts = true;
|
||
|
|
|
||
|
|
# don't use /etc/hosts as this would advertise surfer as localhost
|
||
|
|
no-hosts = true;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
}
|
||
|
|
);
|
||
|
|
}
|