Fix RBAC code (#21234)

* Fix RBAC code

* Fix RBAC code

* Fix RBAC code

* Fix RBAC code

* Fix RBAC code

* Fix RBAC code

* Fix RBAC code

aspnetcore/security/authentication/windowsauth.md

@@ -5,13 +5,13 @@ description: Learn how to configure Windows Authentication in ASP.NET Core for I
 monikerRange: '>= aspnetcore-2.1'
 ms.author: riande
 ms.custom: "mvc, seodec18"
-ms.date: 02/26/2020
+ms.date: 1/15/2021
 no-loc: [appsettings.json, "ASP.NET Core Identity", cookie, Cookie, Blazor, "Blazor Server", "Blazor WebAssembly", "Identity", "Let's Encrypt", Razor, SignalR]
 uid: security/authentication/windowsauth
 ---
 # Configure Windows Authentication in ASP.NET Core
 
-By [Scott Addie](https://twitter.com/Scott_Addie)
+By [Scott Addie](https://twitter.com/Scott_Addie) and [Rick Anderson](https://twitter.com/RickAndMSFT)
 
 ::: moniker range=">= aspnetcore-3.0"
 
@@ -188,25 +188,16 @@ services.AddAuthentication(NegotiateDefaults.AuthenticationScheme)
     });
 ```
 
-Some configurations may require specific credentials to query the LDAP domain. The credentials can be specified in the options:
+Some configurations may require specific credentials to query the LDAP domain. The credentials can be specified in the following highlighted options:
 
-```csharp
-services.AddAuthentication(NegotiateDefaults.AuthenticationScheme)
-    .AddNegotiate(options =>
-    {
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
-        {
-            options.EnableLdap("contoso.com");
-            options.MachineAccountName = "machineName";
-            options.MachineAccountPassword = "PassW0rd";            
-        }
-    });
-```
+[!code-csharp[](windowsauth/sample_snapshot/StartupNegotiateDefaults.cs?name=snippet&highlight=15-20)]
 
 By default, the negotiate authentication handler resolves nested domains. In a large or complicated LDAP environment, resolving nested domains may result in a slow lookup or a lot of memory being used for each user. Nested domain resolution can be disabled using the `IgnoreNestedGroups` option.
 
 Anonymous requests are allowed. Use [ASP.NET Core Authorization](xref:security/authorization/introduction) to challenge anonymous requests for authentication.
 
+<xref:Microsoft.AspNetCore.Authentication.Negotiate.NegotiateDefaults.AuthenticationScheme> requires the NuGet package [Microsoft.AspNetCore.Authentication.Negotiate](https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.Negotiate).
+
 ### Windows environment configuration
 
 The [Microsoft.AspNetCore.Authentication.Negotiate](https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.Negotiate) component performs [User Mode](/windows-hardware/drivers/gettingstarted/user-mode-and-kernel-mode) authentication. Service Principal Names (SPNs) must be added to the user account running the service, not the machine account. Execute `setspn -S HTTP/myservername.mydomain.com myuser` in an administrative command shell.

aspnetcore/security/authentication/windowsauth/sample_snapshot/StartupNegotiateDefaults.cs

@@ -0,0 +1,81 @@
+using Microsoft.AspNetCore.Authentication.Negotiate;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System.Runtime.InteropServices;
+using WebAppRP5.Data;
+
+namespace WebAppRP5
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        #region snippet
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddDbContext<ApplicationDbContext>(options =>
+                options.UseSqlServer(
+                    Configuration.GetConnectionString("DefaultConnection")));
+            services.AddDatabaseDeveloperPageExceptionFilter();
+            services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
+                .AddEntityFrameworkStores<ApplicationDbContext>();
+
+            services.AddAuthentication(NegotiateDefaults.AuthenticationScheme)
+                .AddNegotiate(options =>
+                {
+                    if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+                    {
+                        options.EnableLdap(settings =>
+                        {
+                            settings.Domain = "contoso.com";
+                            settings.MachineAccountName = "machineName";
+                            settings.MachineAccountPassword = Configuration["Password"]
+                        });
+                    }
+                });
+
+            services.AddRazorPages();
+        }
+        #endregion
+
+        #region snippet2
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+                app.UseMigrationsEndPoint();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Error");
+                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+                app.UseHsts();
+            }
+
+            app.UseHttpsRedirection();
+            app.UseStaticFiles();
+
+            app.UseRouting();
+
+            app.UseAuthentication();
+            app.UseAuthorization();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapRazorPages();
+            });
+        }
+        #endregion
+    }
+}