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trust-dns: spin up a separate server to wg-home requests, also forwarding them to upstream

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Colin 2023-09-22 12:36:48 +00:00
parent 68e3bc932f
commit 63d65a453c
1 changed files with 58 additions and 9 deletions
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67
hosts/by-name/servo/services/trust-dns.nix
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@ -7,7 +7,8 @@
# specify each address explicitly, instead of using "*".
# this ensures responses are sent from the address at which the request was received.
config.sane.hosts.by-name."servo".lan-ip
"10.0.1.5"
config.sane.hosts.by-name."servo".wg-home.ip
"10.0.1.5" # field DNS requests from OVPN
];
# don't bind to IPv6 until i explicitly test that stack
services.trust-dns.settings.listen_addrs_ipv6 = [];
@ -34,18 +35,19 @@
sane.dns.zones."uninsane.org".inet = {
SOA."@" = ''
ns1.uninsane.org. admin-dns.uninsane.org. (
2022122101 ; Serial
2023092101 ; Serial
4h ; Refresh
30m ; Retry
7d ; Expire
5m) ; Negative response TTL
'';
TXT."rev" = "2023052901";
TXT."rev" = "2023092101";
CNAME."native" = "%CNAMENATIVE%";
A."@" = "%ANATIVE%";
A."wan" = "%AWAN%";
A."servo.lan" = config.sane.hosts.by-name."servo".lan-ip;
A."servo.hn" = config.sane.hosts.by-name."servo".wg-home.ip;
# XXX NS records must also not be CNAME
# it's best that we keep this identical, or a superset of, what org. lists as our NS.
@ -69,34 +71,68 @@
zone-dir = "/var/lib/trust-dns";
zone-wan = "${zone-dir}/wan/uninsane.org.zone";
zone-lan = "${zone-dir}/lan/uninsane.org.zone";
zone-hn = "${zone-dir}/hn/uninsane.org.zone";
zone-template = pkgs.writeText "uninsane.org.zone.in" config.sane.dns.zones."uninsane.org".rendered;
extra-config-hn = pkgs.writeText "hn-config.toml" ''
[[zones]]
# forward the root zone to the local DNS resolver
zone = "."
zone_type = "Forward"
stores = { type = "forward", name_servers = [{ socket_addr = "127.0.0.53:53", protocol = "udp", trust_nx_responses = true }] }
'';
in pkgs.writeShellScriptBin "trust-dns" ''
# compute wan/lan values
mkdir -p ${zone-dir}/{ovpn,wan,lan}
# parse args meant for trust-dns
_arg__config="$1" # --config
shift
orig_config="$1" # /path/to/config.toml
shift
# compute IP address of self for each interface
mkdir -p ${zone-dir}/{wan,lan,hn}
wan=$(cat '${config.sane.services.dyn-dns.ipPath}')
lan=${config.sane.hosts.by-name."servo".lan-ip}
hn=${config.sane.hosts.by-name."servo".wg-home.ip}
# create specializations that resolve native.uninsane.org to different CNAMEs
${sed} s/%AWAN%/$wan/ ${zone-template} \
| ${sed} s/%CNAMENATIVE%/wan/ \
| ${sed} s/%ANATIVE%/$wan/ \
> ${zone-wan}
ln -sf "$orig_config" "${zone-dir}/wan-config.toml"
${sed} s/%AWAN%/$wan/ ${zone-template} \
| ${sed} s/%CNAMENATIVE%/servo.lan/ \
| ${sed} s/%ANATIVE%/$lan/ \
> ${zone-lan}
ln -sf "$orig_config" "${zone-dir}/lan-config.toml"
${sed} s/%AWAN%/$wan/ ${zone-template} \
| ${sed} s/%CNAMENATIVE%/servo.hn/ \
| ${sed} s/%ANATIVE%/$hn/ \
> ${zone-hn}
cat "$orig_config" "${extra-config-hn}" > "${zone-dir}/hn-config.toml"
# launch the different interfaces, separately
${pkgs.trust-dns}/bin/trust-dns --port 53 --zonedir ${zone-dir}/wan/ $@ &
${pkgs.trust-dns}/bin/trust-dns --port 53 \
--zonedir "${zone-dir}/wan/" --config "${zone-dir}/wan-config.toml" \
"$@" &
WANPID=$!
${pkgs.trust-dns}/bin/trust-dns --port 1053 --zonedir ${zone-dir}/lan/ $@ &
${pkgs.trust-dns}/bin/trust-dns --port 1053 \
--zonedir "${zone-dir}/lan/" --config "${zone-dir}/lan-config.toml" \
"$@" &
LANPID=$!
${pkgs.trust-dns}/bin/trust-dns --port 2053 \
--zonedir "${zone-dir}/hn/" --config "${zone-dir}/hn-config.toml" \
"$@" &
HNPID=$!
# wait until any of the processes exits, then kill them all and exit error
while kill -0 $WANPID $LANPID ; do
while kill -0 $WANPID $LANPID $HNPID; do
sleep 5
done
kill $WANPID $LANPID
kill $WANPID $LANPID $HNPID
exit 1
'';
@ -126,6 +162,14 @@
iptables -t nat -A nixos-nat-pre -p tcp --dport 53 \
-m iprange --src-range 10.78.76.0-10.78.79.255 \
-j DNAT --to-destination :1053
# redirect requests from wireguard in the same manner
iptables -t nat -A nixos-nat-pre -p udp --dport 53 \
-m iprange --src-range 10.0.10.0-10.0.10.255 \
-j DNAT --to-destination :2053
iptables -t nat -A nixos-nat-pre -p tcp --dport 53 \
-m iprange --src-range 10.0.10.0-10.0.10.255 \
-j DNAT --to-destination :2053
'';
sane.ports.ports."1053" = {
@ -135,4 +179,9 @@
visibleTo.lan = true;
description = "colin-redirected-dns-for-lan-namespace";
};
sane.ports.ports."2053" = {
protocol = [ "udp" "tcp" ];
visibleTo.lan = true;
description = "colin-redirected-dns-for-wg-home-namespace";
};
}