nsd-acme

hosts/vno1-oh2/configuration.nix

@@ -70,6 +70,14 @@
         myData.ports.exporters.node
       ];
 
+      nsd-acme = {
+        enable = true;
+        zones."grafana.jakstys.lt" = {
+          accountKey = config.age.secrets.letsencrypt-account-key.path;
+          staging = true;
+        };
+      };
+
       deployerbot = {
         main = {
           enable = true;
@@ -172,36 +180,13 @@
 
     nsd = {
       enable = true;
-      remoteControl.enable = true;
       interfaces = ["0.0.0.0" "::"];
       zones = {
         "jakstys.lt.".data = myData.jakstysLTZone;
       };
-      extraConfig = ''
-        pattern:
-          name: "acme"
-          zonefile: "/var/lib/nsd/zones/%s."
-      '';
     };
   };
 
-  systemd.services.nsd-control-setup = {
-    requiredBy = ["nsd.service"];
-    before = ["nsd.service"];
-    unitConfig.ConditionPathExists = [
-      "|!/etc/nsd/nsd_control.key"
-      "|!/etc/nsd/nsd_control.pem"
-      "|!/etc/nsd/nsd_server.key"
-      "|!/etc/nsd/nsd_server.pem"
-    ];
-    serviceConfig = {
-      Type = "oneshot";
-      UMask = 0077;
-    };
-    path = [pkgs.nsd pkgs.openssl];
-    script = ''nsd-control-setup'';
-  };
-
   networking = {
     hostId = "f9117e1b";
     hostName = "vno1-oh2";

modules/services/default.nix

@@ -7,6 +7,7 @@
   imports = [
     ./deployerbot
     ./friendlyport
+    ./nsd-acme
     ./postfix
     ./syncthing
     ./zfsunlock

modules/services/nsd-acme/default.nix

@@ -0,0 +1,157 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  mkHook = zone: let
+    rc = config.services.nsd.remoteControl;
+    fullZone = "_acme-endpoint.${zone}";
+    nsdconf = ''"$RUNTIME_DIRECTORY"/nsd.conf'';
+  in
+    pkgs.writeShellScript "nsd-acme-hook" ''
+      set -euo pipefail
+      METHOD=$1
+      TYPE=$2
+      AUTH=$5
+      NOW=$(date +%y%m%d%H%M)
+      DIR="/var/lib/nsd/zones"
+
+      sed \
+        -e "s~${rc.controlKeyFile}~$CREDENTIALS_DIRECTORY/nsd_control.key~" \
+        -e "s~${rc.controlCertFile}~$CREDENTIALS_DIRECTORY/nsd_control.pem~" \
+        -e "s~${rc.serverKeyFile}~$CREDENTIALS_DIRECTORY/nsd_server.key~" \
+        -e "s~${rc.serverCertFile}~$CREDENTIALS_DIRECTORY/nsd_server.pem~" \
+        /etc/nsd/nsd.conf > ${nsdconf}
+
+      [ "$TYPE" != "dns-01" ] && { echo "Skipping $TYPE"; exit 1; }
+
+      write_zone() {
+          cat <<EOF
+      \$ORIGIN ${fullZone}.
+      \$TTL 60
+      @      SOA   ${fullZone}. motiejus.jakstys.lt. ($NOW 12h 2h 2w 1h)
+      @      TXT   $AUTH
+      EOF
+      }
+
+      cleanup() {
+          nsd-control delzone ${fullZone}
+          rm -f "$DIR/${fullZone}.acme"
+      }
+
+      case "$METHOD" in
+          begin)
+              echo "Deleting previous ${fullZone} if exists ..."
+              nsd-control -c ${nsdconf} delzone ${fullZone} || :
+              write_zone > "$DIR/${fullZone}.acme"
+
+              echo "Activating ${fullZone}"
+              nsd-control -c ${nsdconf} addzone ${fullZone} acme
+              ;;
+          done)
+              echo "ACME request successful, cleaning up"
+              cleanup
+              ;;
+          failed)
+              echo "ACME request failed, cleaning up"
+              cleanup
+              ;;
+      esac
+    '';
+in {
+  options.mj.services.nsd-acme = with lib.types; {
+    enable = lib.mkEnableOption "enable acme certs via nsd";
+
+    zones = lib.mkOption {
+      default = {};
+      type = attrsOf (submodule (
+        {...}: {
+          options = {
+            accountKey = lib.mkOption {type = path;};
+            days = lib.mkOption {
+              type = int;
+              default = 30;
+            };
+            staging = lib.mkOption {
+              type = bool;
+              default = false;
+            };
+          };
+        }
+      ));
+    };
+  };
+
+  # TODO assert services.nsd.enable
+  config = lib.mkIf config.mj.services.nsd-acme.enable {
+    services.nsd.remoteControl.enable = true;
+    services.nsd.extraConfig = ''
+      pattern:
+        name: "acme"
+        zonefile: "/var/lib/nsd/zones/%s.acme"
+    '';
+
+    systemd.services =
+      {
+        nsd-control-setup = {
+          requiredBy = ["nsd.service"];
+          before = ["nsd.service"];
+          unitConfig.ConditionPathExists = let
+            rc = config.services.nsd.remoteControl;
+          in [
+            "|!${rc.controlKeyFile}"
+            "|!${rc.controlCertFile}"
+            "|!${rc.serverKeyFile}"
+            "|!${rc.serverCertFile}"
+          ];
+          serviceConfig = {
+            Type = "oneshot";
+            UMask = 0077;
+            ExecStart = "${pkgs.nsd}/bin/nsd-control-setup";
+          };
+          path = [pkgs.openssl];
+        };
+      }
+      // lib.mapAttrs'
+      (
+        zone: cfg: let
+          sanitized = lib.strings.sanitizeDerivationName zone;
+        in
+          lib.nameValuePair "nsd-acme-${sanitized}" {
+            description = "dns-01 acme update for ${zone}";
+            path = [pkgs.openssh pkgs.nsd];
+            preStart = ''
+              mkdir -p "$STATE_DIRECTORY/private"
+              ln -sf "$CREDENTIALS_DIRECTORY/letsenctypt-account.key" \
+                "$STATE_DIRECTORY/private/key.pem"
+            '';
+            serviceConfig = {
+              ExecStart = let
+                hook = mkHook zone;
+                days = "--days ${builtins.toString cfg.days}";
+                staging =
+                  if cfg.staging
+                  then "--staging"
+                  else "";
+              in "${pkgs.uacme} --verbose --days ${days} --hook ${hook} ${staging} issue ${zone}";
+              DynamicUser = "yes";
+              StateDirectory = "nsd-acme/${sanitized}";
+              RuntimeDirectory = "nsd-acme/${sanitized}";
+              LoadCredential = let
+                rc = config.services.nsd.remoteControl;
+              in [
+                "nsd_control.key:${rc.controlKeyFile}"
+                "nsd_control.pem:${rc.controlCertFile}"
+                "nsd_server.key:${rc.serverKeyFile}"
+                "nsd_server.pem:${rc.serverCertFile}"
+                "letsencrypt-account.key:${cfg.accountKey}"
+              ];
+            };
+          }
+      )
+      config.mj.services.nsd-acme.zones;
+
+    mj.base.unitstatus.units = lib.mkIf config.mj.base.unitstatus.enable ["nsd-control-setup"];
+  };
+}