fix(auth): OtOpcUa 1.2 review fixes — startup insecure-transport guard + Ldaps in prod overlays, test fidelity, 0.1.1 pin

src/Server/ZB.MOM.WW.OtOpcUa.Host/Configuration/LdapOptionsValidator.cs

@@ -1,5 +1,6 @@
 using ZB.MOM.WW.Configuration;
 using ZB.MOM.WW.OtOpcUa.Security.Ldap;
+using LdapTransport = ZB.MOM.WW.Auth.Abstractions.Ldap.LdapTransport;
 
 namespace ZB.MOM.WW.OtOpcUa.Host.Configuration;
 
@@ -10,13 +11,19 @@ namespace ZB.MOM.WW.OtOpcUa.Host.Configuration;
 ///     TCP port; when disabled — or when <c>DevStubMode</c> bypasses the real bind — all checks are
 ///     skipped. <c>ServiceAccountDn</c>/<c>Password</c> are
 ///     intentionally not required — an empty pair selects the direct-bind path (see
-///     <see cref="LdapOptions.ServiceAccountDn"/>). The plaintext-transport-without-AllowInsecure
-///     guard is enforced at the auth boundary (<see cref="OtOpcUaLdapAuthService"/>) rather than here,
-///     to preserve the bespoke service's behaviour of booting and failing closed at login (not at
-///     startup) when a config selects insecure transport. Failure messages use <c>"Ldap:"</c> as a
+///     <see cref="LdapOptions.ServiceAccountDn"/>). Failure messages use <c>"Ldap:"</c> as a
 ///     human-readable field prefix — not the literal bound section path, which is
 ///     <c>Security:Ldap</c> (see <see cref="LdapOptions.SectionName"/>).
 /// </summary>
+/// <remarks>
+///     Insecure-transport guard (review fix): a real-LDAP config that selects plaintext transport
+///     (<see cref="LdapTransport.None"/>) without opting in via <see cref="LdapOptions.AllowInsecure"/>
+///     now FAILS startup validation, so an insecure-by-accident production overlay never boots.
+///     This mirrors the login-time fail-closed guard in <see cref="OtOpcUaLdapAuthService"/> and is
+///     gated on the same conditions (<see cref="LdapOptions.Enabled"/> AND not
+///     <see cref="LdapOptions.DevStubMode"/>): a disabled or dev-stub config is exempt, exactly as it
+///     is exempt from the real bind. The login-time guard remains as defence in depth.
+/// </remarks>
 public sealed class LdapOptionsValidator : OptionsValidatorBase<LdapOptions>
 {
     /// <inheritdoc />
@@ -32,5 +39,13 @@ public sealed class LdapOptionsValidator : OptionsValidatorBase<LdapOptions>
         builder.RequireThat(!string.IsNullOrWhiteSpace(options.SearchBase),
             "Ldap:SearchBase is required when LDAP login is enabled.");
         builder.Port(options.Port, "Ldap:Port");
+
+        // Fail closed at startup on a plaintext transport unless explicitly opted in — same
+        // condition the login-time guard in OtOpcUaLdapAuthService enforces, lifted to boot so an
+        // insecure-by-accident production overlay refuses to start rather than silently failing
+        // every bind at login.
+        builder.RequireThat(
+            !(options.Transport == LdapTransport.None && !options.AllowInsecure),
+            "LDAP transport is None (plaintext) but AllowInsecure is false — set Transport to Ldaps/StartTls or set AllowInsecure for dev.");
     }
 }

src/Server/ZB.MOM.WW.OtOpcUa.Host/appsettings.admin-driver.json

@@ -11,7 +11,8 @@
   },
   "Security": {
     "Ldap": {
-      "DevStubMode": false
+      "DevStubMode": false,
+      "Transport": "Ldaps"
     }
   }
 }

src/Server/ZB.MOM.WW.OtOpcUa.Host/appsettings.admin.json

@@ -10,7 +10,8 @@
   },
   "Security": {
     "Ldap": {
-      "DevStubMode": false
+      "DevStubMode": false,
+      "Transport": "Ldaps"
     }
   }
 }

src/Server/ZB.MOM.WW.OtOpcUa.Host/appsettings.driver.json

@@ -10,7 +10,8 @@
   },
   "Security": {
     "Ldap": {
-      "DevStubMode": false
+      "DevStubMode": false,
+      "Transport": "Ldaps"
     }
   }
 }