160 lines
5.6 KiB
Nix
160 lines
5.6 KiB
Nix
# TODO: split this file apart into smaller files to make it easier to understand
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{ config, lib, pkgs, ... }:
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let
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dyn-dns = config.sane.services.dyn-dns;
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nativeAddrs = lib.mapAttrs (_name: builtins.head) config.sane.dns.zones."uninsane.org".inet.A;
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bindOvpn = "10.0.1.5";
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in
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{
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sane.ports.ports."53" = {
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protocol = [ "udp" "tcp" ];
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visibleTo.lan = true;
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visibleTo.wan = true;
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visibleTo.ovpn = true;
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description = "colin-dns-hosting";
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};
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sane.dns.zones."uninsane.org".TTL = 900;
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# SOA record structure: <https://en.wikipedia.org/wiki/SOA_record#Structure>
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# SOA MNAME RNAME (... rest)
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# MNAME = Master name server for this zone. this is where update requests should be sent.
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# RNAME = admin contact (encoded email address)
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# Serial = YYYYMMDDNN, where N is incremented every time this file changes, to trigger secondary NS to re-fetch it.
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# Refresh = how frequently secondary NS should query master
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# Retry = how long secondary NS should wait until re-querying master after a failure (must be < Refresh)
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# Expire = how long secondary NS should continue to reply to queries after master fails (> Refresh + Retry)
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sane.dns.zones."uninsane.org".inet = {
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SOA."@" = ''
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ns1.uninsane.org. admin-dns.uninsane.org. (
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2023092101 ; Serial
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4h ; Refresh
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30m ; Retry
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7d ; Expire
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5m) ; Negative response TTL
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'';
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TXT."rev" = "2023092101";
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CNAME."native" = "%CNAMENATIVE%";
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A."@" = "%ANATIVE%";
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A."servo.wan" = "%AWAN%";
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A."servo.lan" = config.sane.hosts.by-name."servo".lan-ip;
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A."servo.hn" = config.sane.hosts.by-name."servo".wg-home.ip;
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# XXX NS records must also not be CNAME
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# it's best that we keep this identical, or a superset of, what org. lists as our NS.
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# so, org. can specify ns2/ns3 as being to the VPN, with no mention of ns1. we provide ns1 here.
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A."ns1" = "%ANATIVE%";
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A."ns2" = "185.157.162.178";
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A."ns3" = "185.157.162.178";
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A."ovpns" = "185.157.162.178";
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NS."@" = [
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"ns1.uninsane.org."
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"ns2.uninsane.org."
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"ns3.uninsane.org."
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];
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};
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services.trust-dns.settings.zones = [ "uninsane.org" ];
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networking.nat.enable = true;
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networking.nat.extraCommands = ''
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# redirect incoming DNS requests from LAN addresses
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# to the LAN-specialized DNS service
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# N.B.: use the `nixos-*` chains instead of e.g. PREROUTING
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# because they get cleanly reset across activations or `systemctl restart firewall`
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# instead of accumulating cruft
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iptables -t nat -A nixos-nat-pre -p udp --dport 53 \
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-m iprange --src-range 10.78.76.0-10.78.79.255 \
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-j DNAT --to-destination :1053
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iptables -t nat -A nixos-nat-pre -p tcp --dport 53 \
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-m iprange --src-range 10.78.76.0-10.78.79.255 \
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-j DNAT --to-destination :1053
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'';
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sane.ports.ports."1053" = {
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# because the NAT above redirects in nixos-nat-pre, LAN requests behave as though they arrived on the external interface at the redirected port.
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# TODO: try nixos-nat-post instead?
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# TODO: or, don't NAT from port 53 -> port 1053, but rather nat from LAN addr to a loopback addr.
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# - this is complicated in that loopback is a different interface than eth0, so rewriting the destination address would cause the packets to just be dropped by the interface
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protocol = [ "udp" "tcp" ];
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visibleTo.lan = true;
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description = "colin-redirected-dns-for-lan-namespace";
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};
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sane.services.trust-dns.enable = true;
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sane.services.trust-dns.instances = let
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mkSubstitutions = flavor: {
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"%AWAN%" = "$(cat '${dyn-dns.ipPath}')";
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"%CNAMENATIVE%" = "servo.${flavor}";
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"%ANATIVE%" = nativeAddrs."servo.${flavor}";
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"%AOVPNS%" = "185.157.162.178";
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};
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in
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{
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wan = {
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substitutions = mkSubstitutions "wan";
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listenAddrsIpv4 = [
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nativeAddrs."servo.lan"
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bindOvpn
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];
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};
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lan = {
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substitutions = mkSubstitutions "lan";
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listenAddrsIpv4 = [ nativeAddrs."servo.lan" ];
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port = 1053;
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};
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hn = {
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substitutions = mkSubstitutions "hn";
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listenAddrsIpv4 = [ nativeAddrs."servo.hn" ];
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port = 1053;
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};
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# hn-resolver = {
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# # don't need %AWAN% here because we forward to the hn instance.
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# listenAddrsIpv4 = [ nativeAddrs."servo.hn" ];
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# extraConfig = {
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# zones = [
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# {
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# zone = "uninsane.org";
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# zone_type = "Forward";
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# stores = {
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# type = "forward";
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# name_servers = [
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# {
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# socket_addr = "${nativeAddrs."servo.hn"}:1053";
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# protocol = "udp";
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# trust_nx_responses = true;
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# }
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# ];
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# };
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# }
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# {
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# # forward the root zone to the local DNS resolver
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# zone = ".";
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# zone_type = "Forward";
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# stores = {
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# type = "forward";
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# name_servers = [
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# {
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# socket_addr = "127.0.0.53:53";
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# protocol = "udp";
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# trust_nx_responses = true;
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# }
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# ];
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# };
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# }
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# ];
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# };
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# };
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};
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sane.services.dyn-dns.restartOnChange = [
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"trust-dns-wan.service"
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"trust-dns-lan.service"
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"trust-dns-hn.service"
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# "trust-dns-hn-resolver.service" # doesn't need restart because it doesn't know about WAN IP
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];
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}
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