trust-dns: split into separate (restartable) services
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@ -1,10 +1,11 @@
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# 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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bindLan = config.sane.hosts.by-name."servo".lan-ip;
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bindHn = config.sane.hosts.by-name."servo".wg-home.ip;
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bindOvpn = "10.0.1.5";
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in
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in lib.mkMerge [
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{
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services.trust-dns.enable = true;
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@ -69,15 +70,55 @@ in
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services.trust-dns.settings.zones = [ "uninsane.org" ];
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services.trust-dns.package =
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# TODO: can i transform this into some sort of service group?
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# have `systemctl restart trust-dns.service` restart all the individual services?
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systemd.services.trust-dns.serviceConfig = {
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DynamicUser = lib.mkForce false;
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User = "trust-dns";
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Group = "trust-dns";
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wantedBy = lib.mkForce [];
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};
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systemd.services.trust-dns.enable = false;
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users.groups.trust-dns = {};
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users.users.trust-dns = {
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group = "trust-dns";
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isSystemUser = true;
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};
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# sane.services.dyn-dns.restartOnChange = [ "trust-dns.service" ];
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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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}
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{
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systemd.services =
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let
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sed = "${pkgs.gnused}/bin/sed";
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zone-dir = "/var/lib/trust-dns";
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zone-wan = "${zone-dir}/wan/uninsane.org.zone";
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zone-lan = "${zone-dir}/lan/uninsane.org.zone";
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zone-hn = "${zone-dir}/hn/uninsane.org.zone";
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zone-template = pkgs.writeText "uninsane.org.zone.in" config.sane.dns.zones."uninsane.org".rendered;
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hn-resolver-config = pkgs.writeText "hn-resolver-config.toml" ''
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zoneDir = "/var/lib/trust-dns";
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zoneTemplate = pkgs.writeText "uninsane.org.zone.in" config.sane.dns.zones."uninsane.org".rendered;
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hnResolverConfig = pkgs.writeText "hn-resolver-config.toml" ''
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# i host a resolver in the wireguard VPN so that clients can resolve DNS through the VPN.
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# (that's what this file achieves).
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#
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@ -107,111 +148,68 @@ in
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stores = { type = "forward", name_servers = [{ socket_addr = "127.0.0.53:53", protocol = "udp", trust_nx_responses = true }] }
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'';
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# TODO: rework this shell script to be independent systemd services per trust-dns instance.
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in pkgs.writeShellScriptBin "trust-dns" ''
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# intercept args meant for the real trust-dns, so i can modify them
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_arg__config="$1" # --config
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shift
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orig_config="$1" # /path/to/config.toml
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shift
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anativeMap = {
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lan = bindLan;
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hn = bindHn;
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wan = "$wan"; # evaluated at runtime
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};
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zoneFor = flavor: "${zoneDir}/${flavor}/uninsane.org.zone";
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mkTrustDnsService = opts: flavor: let
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flags = let baseCfg = config.services.trust-dns; in
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(lib.optional baseCfg.debug "--debug") ++ (lib.optional baseCfg.quiet "--quiet");
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flagsStr = builtins.concatStringsSep " " flags;
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# compute IP address of self for each interface
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mkdir -p ${zone-dir}/{wan,lan,hn}
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wan=$(cat '${config.sane.services.dyn-dns.ipPath}')
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lan=${bindLan}
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hn=${bindHn}
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lanAndOvpn='${bindLan}", "${bindOvpn}'
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# TODO: since we compute the config here, we can customize the listen address right here instead of doing a string substitution.
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toml = pkgs.formats.toml { };
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origConfig = toml.generate "trust-dns.toml" (
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lib.filterAttrsRecursive (_: v: v != null) config.services.trust-dns.settings
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);
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# create specializations that resolve native.uninsane.org to different CNAMEs
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${sed} \
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-e s/%AWAN%/$wan/ \
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-e s/%CNAMENATIVE%/wan/ \
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-e s/%ANATIVE%/$wan/ \
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${zone-template} > ${zone-wan}
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# to service WAN, listen both on LAN interface and the OVPN interface
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sed "s/%LISTEN%/$lanAndOvpn/" $orig_config > ${zone-dir}/wan-config.toml
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configFile = "${zoneDir}/${flavor}-config.toml";
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anative = anativeMap."${flavor}";
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listen = opts.listen or anative;
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port = opts.port or 53;
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makeConfig = if opts ? config then
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"ln -sf ${opts.config} ${configFile}"
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else ''
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wan=$(cat '${config.sane.services.dyn-dns.ipPath}')
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${sed} \
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-e s/%AWAN%/$wan/ \
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-e s/%CNAMENATIVE%/servo.${flavor}/ \
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-e s/%ANATIVE%/${anative}/ \
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${zoneTemplate} > ${zoneFor flavor}
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# listen only on the desired interfaces
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sed 's/%LISTEN%/${listen}/' ${origConfig} > ${configFile}
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'';
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in {
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description = "trust-dns Domain Name Server (serving ${flavor})";
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unitConfig.Documentation = "https://trust-dns.org/";
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${sed} \
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-e s/%AWAN%/$wan/ \
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-e s/%CNAMENATIVE%/servo.lan/ \
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-e s/%ANATIVE%/$lan/ \
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${zone-template} > ${zone-lan}
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# to service LAN, listen only on the LAN
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sed s/%LISTEN%/$lan/ $orig_config > ${zone-dir}/lan-config.toml
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preStart = makeConfig;
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serviceConfig = config.systemd.services.trust-dns.serviceConfig // {
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ExecStart = ''
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${pkgs.trust-dns}/bin/trust-dns \
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--port ${builtins.toString port} \
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--zonedir ${zoneDir}/${flavor}/ \
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--config ${configFile} ${flagsStr}
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'';
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};
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${sed} \
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-e s/%AWAN%/$wan/ \
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-e s/%CNAMENATIVE%/servo.hn/ \
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-e s/%ANATIVE%/$hn/ \
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${zone-template} > ${zone-hn}
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# to service wireguard, listen only on hn
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sed s/%LISTEN%/$hn/ $orig_config > ${zone-dir}/hn-config.toml
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# launch the different interfaces, separately
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${pkgs.trust-dns}/bin/trust-dns \
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--zonedir "${zone-dir}/wan/" --config "${zone-dir}/wan-config.toml" \
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"$@" &
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WANPID=$!
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${pkgs.trust-dns}/bin/trust-dns --port 1053 \
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--zonedir "${zone-dir}/lan/" --config "${zone-dir}/lan-config.toml" \
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"$@" &
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LANPID=$!
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ln -sf ${hn-resolver-config} ${zone-dir}/hn-resolver-config.toml
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${pkgs.trust-dns}/bin/trust-dns \
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--config "${zone-dir}/hn-resolver-config.toml" \
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"$@" &
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HNRESOLVERPID=$!
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${pkgs.trust-dns}/bin/trust-dns --port 1053 \
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--zonedir "${zone-dir}/hn/" --config "${zone-dir}/hn-config.toml" \
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"$@" &
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HNPID=$!
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# wait until any of the processes exits, then kill them all and exit error
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while kill -0 $WANPID $LANPID $HNRESOLVERPID $HNPID; do
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sleep 5
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done
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kill $WANPID $LANPID $HNRESOLVERPID $HNPID
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exit 1
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'';
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systemd.services.trust-dns.serviceConfig = {
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DynamicUser = lib.mkForce false;
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User = "trust-dns";
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Group = "trust-dns";
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};
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users.groups.trust-dns = {};
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users.users.trust-dns = {
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group = "trust-dns";
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isSystemUser = true;
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};
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sane.services.dyn-dns.restartOnChange = [ "trust-dns.service" ];
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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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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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};
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in {
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trust-dns-wan = mkTrustDnsService { listen = ''${bindLan}", "${bindOvpn}''; } "wan";
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trust-dns-lan = mkTrustDnsService { port = 1053; } "lan";
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trust-dns-hn = mkTrustDnsService { port = 1053; } "hn";
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trust-dns-hn-resolver = mkTrustDnsService { config = hnResolverConfig; } "hn-resolver";
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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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]
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