Berwn
6e4178df04
- Register mx1 in the inventory and as a direct-SSH `internet` host; give it a static public IPv6 (2a01:4ff:2f0:1963::1). - Point the cnx.email MX (plus SPF/DMARC) at mx1 and add its A record. - Bring mx1 into monitoring: import exporters, add it to the mesh map and the node scrape job so its host metrics and journald reach control. - Add a clan-mx1 Hetzner firewall: inbound SMTP + ZeroTier + ICMP, no public SSH (admin rides the mesh like the other hosts). 587/465/993 held for now. - Extract per-host public IPv4/IPv6 into modules/hosts.nix, consumed by clan.nix's internet hosts and each machine's cnx.staticIPv6, so each address is declared once instead of being duplicated across configs. - docs: add mx1 to the machines table.
102 lines
3.6 KiB
Nix
102 lines
3.6 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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domains = import ../../modules/dns/domains.nix;
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mesh = import ../../modules/mesh-hosts.nix { inherit config lib; };
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hosts = import ../../modules/hosts.nix;
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in
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{
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imports = [
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../../modules/dns/authoritative.nix
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../../modules/static-ipv6.nix
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../../modules/monitoring/exporters.nix
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];
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clan.core.sops.defaultGroups = [ "admins" ];
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# Knot's state dir holds the non-regenerable DNSSEC key material (KSK/ZSK
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# private keys in the KASP keystore). Declaring it as clan state makes the
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# borgbackup client back it up; losing it forces an emergency DS rollover at
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# the registrar. mode 0700 owned by knot, but borg runs as root so it reads it.
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clan.core.state.knot.folders = [ "/var/lib/knot" ];
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# The borgbackup repo is addressed as `borg@control`; mesh peers have no name
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# resolution, so map the control machine name to its ZeroTier mesh address.
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networking.hosts.${mesh.hosts.control} = [ "control" ];
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# Public IPv6 (from modules/hosts.nix; matches the ns1 AAAA glue); SLAAC
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# doesn't bring it up here.
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cnx.staticIPv6 = {
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enable = true;
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address = hosts.${config.networking.hostName}.ipv6;
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};
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time.timeZone = "Etc/GMT-1"; # UTC+1 (fixed offset, no DST)
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services.timesyncd.enable = true;
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# ACME DNS-01 (RFC 2136): a dedicated TSIG key, scoped to ns1 only, that an
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# external ACME client uses to write _acme-challenge TXT records. acl_acme
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# (referenced by each zone below) limits the key to TXT updates at or under
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# _acme-challenge.<zone>; Knot then signs the record and transfers it to ns2,
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# which never needs this key. Retrieve the secret for the client with:
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# clan vars get ns1 dns-acme-tsig/acme.conf
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clan.core.vars.generators.dns-acme-tsig = {
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files."acme.conf" = {
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secret = true;
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owner = "knot";
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group = "knot";
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};
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runtimeInputs = [ pkgs.knot-dns ];
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script = ''
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keymgr -t acme_ddns hmac-sha256 > "$out"/acme.conf
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'';
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};
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services.knot.keyFiles = [
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config.clan.core.vars.generators.dns-acme-tsig.files."acme.conf".path
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];
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services.knot.settings.acl = [
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{
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id = "acl_acme";
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key = "acme_ddns";
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action = [ "update" ];
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"update-type" = [ "TXT" ];
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"update-owner" = "name";
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"update-owner-match" = "sub-or-equal";
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"update-owner-name" = [ "_acme-challenge" ];
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}
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];
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# Automatic DNSSEC signing policy (primary only). ECDSA P-256/SHA-256 with
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# Knot's default key management: the ZSK auto-rolls and the KSK is kept stable,
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# so the DS at the registrar only changes on a manual KSK rollover.
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services.knot.settings.policy = [
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{
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id = "cnx";
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algorithm = "ecdsap256sha256";
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}
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];
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# ns1 = primary (master): loads each zone from its file and serves it to ns2.
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# zonefile-load = difference-no-serial lets us edit records without touching the
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# SOA serial; Knot diffs the file, assigns a unixtime serial, signs the zone,
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# then notifies ns2 and lets it pull the signed zone via AXFR/IXFR. unixtime is
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# strictly monotonic per reload, so two zone versions can never share a serial
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# (the failure mode dateserial's 2-digit daily counter allowed after a journal reset).
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services.knot.settings.zone = map (d: {
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domain = d;
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file = ../../modules/dns/zones + "/${d}.zone";
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"zonefile-load" = "difference-no-serial";
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"zonefile-sync" = "-1";
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"journal-content" = "all"; # required by difference-no-serial; holds the live signed zone
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"serial-policy" = "unixtime";
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"dnssec-signing" = true;
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"dnssec-policy" = "cnx";
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notify = [ "ns2" ];
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acl = [
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"acl_ns2"
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"acl_acme"
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]; # ns2 transfers; acme_ddns key does DNS-01 updates
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}) domains;
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}
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