working mtls for janus system

modules/services/step-ca/mtls.nix

@@ -2,18 +2,27 @@
 {
   flake.modules.nixos.mtls = { config, lib, pkgs, ... }:
   let
-    certDir = config.mtls.certDir;
-    tlsKey = "${certDir}/${config.mtls.keyFilename}";
-    tlsCert = "${certDir}/${config.mtls.certFilename}";
-    mtlsBundle = "${certDir}/${config.mtls.bundleFilename}";
+    cfg = config.mtls;
+    certDir = cfg.certDir;
+    tlsKey = "${certDir}/${cfg.keyFilename}";
+    tlsCert = "${certDir}/${cfg.certFilename}";
+    mtlsBundle = "${certDir}/${cfg.bundleFilename}";
   in
   {
     options.mtls = {
       enable = lib.mkEnableOption "Enable mTLS";
+      caURL = lib.mkOption {
+        description = "URL to the certificate authority";
+        type = lib.types.str;
+      };
+      subject = lib.mkOption {
+        description = "The Common Name, DNS Name, or IP address that will be set as the Subject Common Name for the certificate. If no Subject Alternative Names (SANs) are configured (via the --san flag) then the subject will be set as the only SAN.";
+        type = lib.types.str;
+      };
       certDir = lib.mkOption {
         description = "String path to where the mtls certs will be stored.";
         type = lib.types.str;
-        default = "/var/lib/tls";
+        default = "/etc/step";
       };
       keyFilename = lib.mkOption {
         description = "String filename for the private key";
@@ -33,10 +42,13 @@
     };
 
     config = {
-      environment.systemPackages = with pkgs; [
+      environment.systemPackages = with pkgs; lib.optionals cfg.enable [
         (writeShellScriptBin "mtls-generate" ''
+          set -euo pipefail
           ${lib.getExe pkgs.step-cli} ca certificate \
-            john-pc-ubuntu ${tlsCert} ${tlsKey} \
+            ${cfg.subject} ${tlsCert} ${tlsKey} \
+            --ca-url ${cfg.caURL} \
+            --root ${cfg.certDir}/certs/root_ca.crt \
             --provisioner admin \
             --san 192.168.1.85 \
             --san spiffe://john-stream.com/ubuntu