nixfiles/nixos/boxes/colony/vms/estuary/dns.nix

275 lines
8.2 KiB
Nix

{ lib, pkgs, config, assignments, allAssignments, ... }:
let
inherit (builtins) attrNames stringLength genList filter;
inherit (lib)
concatStrings concatStringsSep concatMapStringsSep mapAttrsToList filterAttrs genAttrs optionalString flatten;
ptrDots = 2;
reverseZone = "100.10.in-addr.arpa";
ptrDots6 = 20;
reverseZone6 = "1.d.4.0.0.c.7.9.e.0.a.2.ip6.arpa";
ptr6ValTrim = (stringLength "2a0e:97c0:4d1:") + 1;
authZones = attrNames config.my.pdns.auth.bind.zones;
in
{
config = {
my = {
secrets.files = {
"estuary/pdns/auth.conf" = {
owner = "pdns";
group = "pdns";
};
"estuary/pdns/recursor.conf" = {
owner = "pdns-recursor";
group = "pdns-recursor";
};
"estuary/netdata/powerdns.conf" = {
owner = "netdata";
group = "netdata";
};
"estuary/netdata/powerdns_recursor.conf" = {
owner = "netdata";
group = "netdata";
};
};
pdns.recursor = {
enable = true;
extraSettingsFile = config.age.secrets."estuary/pdns/recursor.conf".path;
};
};
services = {
netdata = {
configDir = {
"go.d/powerdns.conf" = config.age.secrets."estuary/netdata/powerdns.conf".path;
"go.d/powerdns_recursor.conf" = config.age.secrets."estuary/netdata/powerdns_recursor.conf".path;
};
};
pdns-recursor = {
dns = {
address = [
"127.0.0.1" "::1"
assignments.base.ipv4.address assignments.base.ipv6.address
];
allowFrom = [
"127.0.0.0/8" "::1/128"
lib.my.colony.prefixes.all.v4 lib.my.colony.prefixes.all.v6
];
};
settings = {
query-local-address = [ "0.0.0.0" "::" ];
forward-zones = map (z: "${z}=127.0.0.1:5353") authZones;
# DNS NOTIFY messages override TTL
allow-notify-for = authZones;
allow-notify-from = [ "127.0.0.0/8" "::1/128" ];
webserver = true;
webserver-address = "::";
webserver-allow-from = [ "127.0.0.1" "::1" ];
lua-dns-script = pkgs.writeText "pdns-script.lua" ''
function preresolve(dq)
if dq.qname:equal("nix-cache.nul.ie") then
dq:addAnswer(pdns.CNAME, "http.fra1.int.nul.ie.")
dq.rcode = 0
dq.followupFunction = "followCNAMERecords"
return true
end
return false
end
'';
};
};
};
# For rec_control
environment.systemPackages = with pkgs; [
pdns-recursor
];
my.pdns.auth = {
enable = true;
extraSettingsFile = config.age.secrets."estuary/pdns/auth.conf".path;
settings = {
primary = true;
resolver = "127.0.0.1";
expand-alias = true;
local-address = [
"0.0.0.0:5353" "[::]:5353"
];
also-notify = [ "127.0.0.1" ];
allow-axfr-ips = [
"216.218.133.2" "2001:470:600::2"
];
enable-lua-records = true;
#loglevel = 7;
#log-dns-queries = true;
#log-dns-details = true;
api = true;
webserver = true;
webserver-address = "::";
webserver-allow-from = [ "127.0.0.1" "::1" ];
};
bind = {
file-records.sshKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBSvcgbEesOgvKJLt3FLXPaLOcCIuOUYtZXXtEv6k4Yd";
};
bind.zones =
let
genRecords = assignments: f:
concatStringsSep
"\n"
(filter
(s: s != "")
(flatten
(map
(assignment: (mapAttrsToList
(_: as: f as."${assignment}")
(filterAttrs
(_: as: as ? "${assignment}" && as."${assignment}".visible)
allAssignments)))
assignments)));
genFor = [ "internal" "base" "vms" "ctrs" ];
intRecords =
genRecords genFor (a: ''
${a.name} IN A ${a.ipv4.address}
${a.name} IN AAAA ${a.ipv6.address}
${concatMapStringsSep "\n" (alt: "${alt} IN CNAME ${a.name}") a.altNames}
'');
intPtrRecords =
genRecords
genFor
(a:
optionalString
a.ipv4.genPTR
''@@PTR:${a.ipv4.address}:${toString ptrDots}@@ IN PTR ${a.name}.${config.networking.domain}.'');
intPtr6Records =
genRecords
genFor
(a:
optionalString
a.ipv4.genPTR
''@@PTR:${a.ipv6.address}:${toString ptrDots6}@@ IN PTR ${a.name}.${config.networking.domain}.'');
wildcardPtrDef = ''IN LUA PTR "createReverse('ip-%3%-%4%.${config.networking.domain}')"'';
reverse6Script =
let
len = toString ptr6ValTrim;
in
pkgs.writeText "reverse6.lua" ''
local root = newDN("ip6.arpa.")
local ptr = qname:makeRelative(root):toStringNoDot()
local nibbles = string.gsub(string.reverse(ptr), "%.", "")
local ip6 = string.sub(nibbles, 1, 4)
for i = 1, 7 do
ip6 = ip6 .. ":" .. string.sub(nibbles, (i*4)+1, (i+1)*4)
end
local addr = newCA(ip6)
return "ip6-" .. string.sub(string.gsub(addr:toString(), ":", "-"), ${len}) .. ".${config.networking.domain}."
'';
wildcardPtr6Def = ''IN LUA PTR "dofile('${reverse6Script}')"'';
wildcardPtr6Zeroes = n: concatStrings (genList (_: "0.") n);
wildcardPtr6' = n: root: ''*.${wildcardPtr6Zeroes n}${root} ${wildcardPtr6Def}'';
wildcardPtr6 = n: root: concatStringsSep "\n" (genList (i: wildcardPtr6' i root) (n - 1));
wildcardPtr6Z = wildcardPtr6 ptrDots6;
in
{
"${config.networking.domain}" = {
type = "master";
text = ''
$TTL 60
@ IN SOA ns.${config.networking.domain}. dev.nul.ie. (
@@SERIAL@@ ; serial
3h ; refresh
1h ; retry
1w ; expire
1h ; minimum
)
@ IN NS ns
ns IN ALIAS ${config.networking.fqdn}.
@ IN ALIAS ${config.networking.fqdn}.
http IN A ${assignments.internal.ipv4.address}
http IN AAAA ${allAssignments.middleman.internal.ipv6.address}
valheim IN A ${assignments.internal.ipv4.address}
valheim IN AAAA ${allAssignments.valheim-oci.internal.ipv6.address}
$TTL 3
_acme-challenge IN LUA TXT @@FILE@@
$TTL 60
${intRecords}
'';
};
"${reverseZone}" = {
type = "master";
text = ''
$TTL 60
@ IN SOA ns.${config.networking.domain}. dev.nul.ie. (
@@SERIAL@@ ; serial
3h ; refresh
1h ; retry
1w ; expire
1h ; minimum
)
@ IN NS ns.${config.networking.domain}.
${intPtrRecords}
* ${wildcardPtrDef}
; Have to add a specific wildcard for each of the explicitly set subnets...
*.0 ${wildcardPtrDef}
*.1 ${wildcardPtrDef}
*.2 ${wildcardPtrDef}
'';
};
"${reverseZone6}" = {
type = "master";
text = ''
$TTL 60
@ IN SOA ns.${config.networking.domain}. dev.nul.ie. (
@@SERIAL@@ ; serial
3h ; refresh
1h ; retry
1w ; expire
1h ; minimum
)
@ IN NS ns.${config.networking.domain}.
@ IN NS ns1.he.net.
${intPtr6Records}
* ${wildcardPtr6Def}
; Have to add a specific wildcard for each of the explicitly set subnets... this is disgusting for IPv6
*.0 ${wildcardPtr6Def}
*.0.0 ${wildcardPtr6Def}
*.1.0.0 ${wildcardPtr6Def}
${wildcardPtr6Z "0.1.0.0"}
${wildcardPtr6Z "1.1.0.0"}
${wildcardPtr6Z "2.1.0.0"}
'';
};
};
};
};
}