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-rw-r--r--krebs/2configs/nameserver.nix150
1 files changed, 150 insertions, 0 deletions
diff --git a/krebs/2configs/nameserver.nix b/krebs/2configs/nameserver.nix
new file mode 100644
index 000000000..4b205a13d
--- /dev/null
+++ b/krebs/2configs/nameserver.nix
@@ -0,0 +1,150 @@
+{ config, lib, pkgs, ... }: let
+ acmeChallenge =
+ { domain
+ , nameserver
+ , adminEmail
+ , serial ? 0
+ , refresh ? 3600
+ , retry ? 900
+ , expire ? 604800
+ , minimum ? 180
+ }:
+ pkgs.writeText "${domain}.zone" /* bindzone */ ''
+ $TTL 60
+ @ IN SOA ${lib.concatStringsSep " " [
+ "${nameserver}."
+ "${lib.replaceStrings ["@"] ["."] adminEmail}."
+ (toString serial)
+ (toString refresh)
+ (toString retry)
+ (toString expire)
+ (toString minimum)
+ ]}
+ @ IN NS ${nameserver}.
+ '';
+in {
+ networking.firewall.allowedTCPPorts = [
+ 53 # domain for AXFR
+ ];
+ networking.firewall.allowedUDPPorts = [
+ 53 # domain
+ ];
+
+ krebs.systemd.services.knot.restartIfCredentialsChange = true;
+ systemd.services.knot.serviceConfig.LoadCredential = [
+ "keys.conf:/var/src/secrets/knot-keys.conf"
+ ];
+
+ services.knot = {
+ enable = true;
+ keyFiles = [
+ "/run/credentials/knot.service/keys.conf"
+ ];
+ extraConfig = /* yaml */ ''
+ server:
+ udp-max-payload: 4096
+ listen: [ 127.0.0.53@2, ${
+ lib.concatMapStringsSep ", "
+ (addr: "${addr}@53")
+ (
+ config.krebs.build.host.nets.internet.addrs or []
+ ++
+ # This is required for hosts at OCI because the default route
+ # provided by DHCP is using the private address.
+ config.krebs.build.host.nets.intranet.addrs or []
+ )
+ } ]
+
+ log:
+ - target: syslog
+ any: debug
+
+ remote:
+
+ acl:
+ - id: acme_acl
+ key: acme
+ action: update
+
+ - id: dane_acl
+ key: dane
+ action: update
+
+ mod-rrl:
+ - id: default
+ rate-limit: 200 # Allow 200 resp/s for each flow
+ slip: 2 # Every other response slips
+
+ policy:
+ - id: rsa2k
+ algorithm: rsasha256
+ ksk-size: 4096
+ zsk-size: 2048
+
+ template:
+ - id: default
+ global-module: mod-rrl/default
+ semantic-checks: on
+ zonefile-sync: -1
+ zonefile-load: difference-no-serial
+ journal-content: all
+
+ zone:
+ - domain: krebsco.de
+ file: ${pkgs.krebs.zones."krebsco.de"}
+ dnssec-signing: on
+ dnssec-policy: rsa2k
+ acl: dane_acl
+
+ - domain: _acme-challenge.krebsco.de
+ file: ${acmeChallenge {
+ domain = "_acme-challenge.krebsco.de";
+ nameserver = "ns1.krebsco.de";
+ adminEmail = "spam@krebsco.de";
+ }}
+ acl: acme_acl
+
+ - domain: r
+ file: ${pkgs.krebs.zones.r}
+
+ - domain: w
+ file: ${pkgs.krebs.zones.w}
+ '';
+ };
+
+ systemd.services."knsupdate-krebsco.de" = {
+ serviceConfig = {
+ Type = "oneshot";
+ SyslogIdentifier = "knsupdate-krebsco.de";
+ ExecStart = pkgs.writeDash "knsupdate-krebsco.de" /* sh */ ''
+ set -efu
+
+ mk_certificate_association_data() {
+ ${pkgs.openssl}/bin/openssl x509 -noout -fingerprint -sha256 < "$1" |
+ ${pkgs.coreutils}/bin/cut -d= -f2 |
+ ${pkgs.coreutils}/bin/tr -d :
+ }
+
+ certfile=/var/lib/acme/krebsco.de/cert.pem
+ certificate_association_data=$(mk_certificate_association_data "$certfile")
+ keyfile=/var/src/secrets/dane.tsig
+
+ script=$(${pkgs.coreutils}/bin/mktemp -t knsupdate.XXXXXXXX)
+ trap 'rm "$script"' EXIT
+ (
+ exec >"$script"
+ echo server krebsco.de.
+ echo zone krebsco.de.
+ echo origin krebsco.de.
+ echo add _25._tcp.ni 60 IN TLSA 3 0 1 $certificate_association_data
+ echo add _443._tcp.ni 60 IN TLSA 3 0 1 $certificate_association_data
+ echo show
+ echo send
+ echo answer
+ echo quit
+ )
+ ${pkgs.knot-dns}/bin/knsupdate -k "$keyfile" "$script"
+ '';
+ };
+ };
+}