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clan: add temporary patched coredns service

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Needed for IPv6 support, and to set the host names
in the auth zone.
This commit is contained in:
Romain Paquet
2025-11-24 17:11:04 +01:00
parent e1219f26c3
commit de99dad887
4 changed files with 325 additions and 0 deletions
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233
clanServices/coredns/default.nix Normal file
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@@ -0,0 +1,233 @@
{ ... }:
{
_class = "clan.service";
manifest.name = "coredns";
manifest.description = "Clan-internal DNS and service exposure";
manifest.categories = [ "Network" ];
manifest.readme = builtins.readFile ./README.md;
roles.server = {
description = "A DNS server that resolves services in the clan network.";
interface =
{ lib, ... }:
{
options.tld = lib.mkOption {
type = lib.types.str;
default = "clan";
description = ''
Top-level domain for this instance. All services below this will be
resolved internally.
'';
};
options.ip = lib.mkOption {
type = lib.types.str;
# TODO: Set a default
description = "IP for the DNS to listen on";
};
options.dnsPort = lib.mkOption {
type = lib.types.int;
default = 1053;
description = "Port of the clan-internal DNS server";
};
};
perInstance =
{
roles,
settings,
...
}:
{
nixosModule =
{
lib,
pkgs,
...
}:
let
hostServiceEntries =
host:
lib.strings.concatStringsSep "\n" (
map (
service:
let
ip = roles.default.machines.${host}.settings.ip;
isIPv4 = addr: (builtins.match "\\." addr) != null;
recordType = if (isIPv4 ip) then "A" else "AAAA";
in
"${service} IN ${recordType} ${ip} ; ${host}"
) roles.default.machines.${host}.settings.services
);
hostnameEntries = ''
crocus 10800 IN AAAA fd28:387a:90:c400:6db2:dfc3:c376:9956
genepi 10800 IN AAAA fd28:387a:90:c400:ab23:3d38:a148:f539
verbena 10800 IN AAAA fd28:387a:90:c400::1
haze 10800 IN AAAA fd28:387a:90:c400:840e:e9db:4c08:b920
'';
zonefile = builtins.toFile "${settings.tld}.zone" (
''
$TTL 3600 ; 1 Hour
$ORIGIN ${settings.tld}.
${settings.tld}. IN SOA ns1 admin.rpqt.fr. (
2025112300 ; serial
10800 ; refresh
3600 ; retry
604800 ; expire
300 ; minimum
)
${builtins.concatStringsSep "\n" (
lib.lists.imap1 (i: _m: "@ 1D IN NS ns${toString i}.${settings.tld}.") (
lib.attrNames roles.server.machines
)
)}
${builtins.concatStringsSep "\n" (
lib.lists.imap1 (i: m: "ns${toString i} 10800 IN CNAME ${m}.${settings.tld}.") (
lib.attrNames roles.server.machines
)
)}
''
+ hostnameEntries
+ "\n"
+ (lib.strings.concatStringsSep "\n" (
map (host: hostServiceEntries host) (lib.attrNames roles.default.machines)
))
);
in
{
networking.firewall.interfaces.wireguard = {
allowedTCPPorts = [ settings.dnsPort ];
allowedUDPPorts = [ settings.dnsPort ];
};
services.coredns = {
enable = true;
config =
let
dnsPort = builtins.toString settings.dnsPort;
in
''
.:${dnsPort} {
forward . 1.1.1.1
cache 30
}
${settings.tld}:${dnsPort} {
file ${zonefile}
}
'';
};
};
};
};
roles.default = {
description = "A machine that registers the 'server' role as resolver and registers services under the configured TLD in the resolver.";
interface =
{ lib, ... }:
{
options.services = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
description = ''
Service endpoints this host exposes (without TLD). Each entry will
be resolved to <entry>.<tld> using the configured top-level domain.
'';
};
options.ip = lib.mkOption {
type = lib.types.str;
# TODO: Set a default
description = "IP on which the services will listen";
};
options.dnsPort = lib.mkOption {
type = lib.types.int;
default = 1053;
description = "Port of the clan-internal DNS server";
};
};
perInstance =
{ roles, settings, ... }:
{
nixosModule =
{ config, lib, ... }:
{
networking.nameservers = map (
m:
let
port = config.services.unbound.settings.port or 53;
in
"127.0.0.1:${toString port}#${roles.server.machines.${m}.settings.tld}"
) (lib.attrNames roles.server.machines);
services.resolved.domains = map (m: "~${roles.server.machines.${m}.settings.tld}") (
lib.attrNames roles.server.machines
);
services.unbound = {
enable = true;
resolveLocalQueries = true;
checkconf = true;
settings = {
server = {
# port = 5353;
verbosity = 2;
interface = [ "127.0.0.1" ];
access-control = [ "127.0.0.0/8 allow" ];
do-not-query-localhost = "no";
domain-insecure = map (m: "${roles.server.machines.${m}.settings.tld}.") (
lib.attrNames roles.server.machines
);
};
# Default: forward everything else to DHCP-provided resolvers
# forward-zone = [
# {
# name = ".";
# forward-addr = "127.0.0.53@53"; # Forward to systemd-resolved
# }
# ];
forward-zone = [
{
name = ".";
forward-tls-upstream = true;
forward-addr = [
"9.9.9.9#dns.quad9.net"
"149.112.112.112#dns.quad9.net"
"1.1.1.1@853#cloudflare-dns.com"
"1.0.0.1@853#cloudflare-dns.com"
"2606:4700:4700::1111@853#cloudflare-dns.com"
"2606:4700:4700::1001@853#cloudflare-dns.com"
"8.8.8.8#dns.google"
"8.8.4.4#dns.google"
"2001:4860:4860::8888#dns.google"
"2001:4860:4860::8844#dns.google"
];
}
];
stub-zone = {
name = "${roles.server.machines.${(lib.head (lib.attrNames roles.server.machines))}.settings.tld}.";
stub-addr = map (
m: "${roles.server.machines.${m}.settings.ip}@${builtins.toString settings.dnsPort}"
) (lib.attrNames roles.server.machines);
};
};
};
};
};
};
}