多租户Azure移动应用程序服务调用因401.71而失败

作为前言，我是Azure编程和Azure AD身份验证的新手，我一直在关注我在各个站点（包括MS）找到的教程，以便让我走到这一步 . 我正在使用Xcode v7.2，适用于iOS v1.2.4的ADAL，Visual Studio 2015 Update 1和Azure App Service Tools v2.8.1 .

我有一个现有的原生iOS应用程序，我需要能够通过身份验证多个Azure Active Directory实例用户 . 这些用户是内部和外部（注册我们服务的客户） . 为此，我实验性地实现了以下高级架构：

Native Client App（iOS / obj-c） - > ADAL iOS库 - >（Azure AD身份验证） - > Azure Mobile App（服务层）

iOS应用程序利用ADAL iOS库获取访问令牌，该令牌用于调用Azure Mobile App项目中的授权Web API服务 .

我能够对来自两个租户（内部Azure AD和外部Azure AD）的用户进行身份验证，但只有与服务（内部）相同的租户中的用户才能调用经过身份验证的API . 我从外部租户使用的测试用户帐户被设置为全局管理员，并在进行身份验证时在本机应用程序中显示相应的同意视图 . 然后，我可以点击同意，然后我会收到一个访问令牌 . 然而，当使用该令牌调用测试API时，我得到了401 . 服务器上Azure Mobile App的详细日志显示以下消息（以下所有URL都是https，我只是没有代表发布它们）：

2016-01-12T13:00:55  PID[7972] Verbose     Received request: GET MyAzureMobileApp.azurewebsites.net/api/values
2016-01-12T13:00:55  PID[7972] Verbose     Downloading OpenID configuration from sts.windows.net/<internal AD GUID>/.well-known/openid-configuration
2016-01-12T13:00:55  PID[7972] Verbose     Downloading OpenID issuer keys from login.windows.net/common/discovery/keys
2016-01-12T13:00:56  PID[7972] Warning     JWT validation failed: IDX10205: Issuer validation failed. Issuer: 'sts.windows.net/<external AD GUID>/'. Did not match: validationParameters.ValidIssuer: 'sts.windows.net/<internal ad guid>/' or validationParameters.ValidIssuers: 'null'..
2016-01-12T13:00:56  PID[7972] Information Sending response: 401.71 Unauthorized

我在几篇帖子中读到，您可以通过将TokenValidationParameters中的ValidateIssuer参数设置为false来禁用服务中的令牌颁发者验证 . 我似乎没有任何影响 . 以下是我的Azure移动应用程序项目中的代码：

启动代码：

// Startup.cs
using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(MyAzureMobileApp.Startup))]
namespace MyAzureMobileApp
{
    public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            ConfigureMobileApp(app);
            ConfigureAuth(app);
        }
    }
}

MobileApp的代码 - 这应该是库存，由Azure Mobile App项目模板生成：

// Startup.MobileApp.cs  
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.Entity;
using System.Web.Http;
using Microsoft.Azure.Mobile.Server;
using Microsoft.Azure.Mobile.Server.Authentication;
using Microsoft.Azure.Mobile.Server.Config;
using MyAzureMobileApp.DataObjects;
using MyAzureMobileApp.Models;
using Owin;

namespace MyAzureMobileApp
{
    public partial class Startup
    {
        public static void ConfigureMobileApp(IAppBuilder app)
        {
            HttpConfiguration config = new HttpConfiguration();

            new MobileAppConfiguration()
                .UseDefaultConfiguration()
                .ApplyTo(config);

            // Use Entity Framework Code First to create database tables based on your DbContext
            Database.SetInitializer(new MobileServiceInitializer());

            MobileAppSettingsDictionary settings = config.GetMobileAppSettingsProvider().GetMobileAppSettings();

            if (string.IsNullOrEmpty(settings.HostName))
            {
                app.UseAppServiceAuthentication(new AppServiceAuthenticationOptions
                {
                    // This middleware is intended to be used locally for debugging. By default, HostName will
                    // only have a value when running in an App Service application.
                    SigningKey = ConfigurationManager.AppSettings["SigningKey"],
                    ValidAudiences = new[] { ConfigurationManager.AppSettings["ValidAudience"] },
                    ValidIssuers = new[] { ConfigurationManager.AppSettings["ValidIssuer"] },
                    TokenHandler = config.GetAppServiceTokenHandler()
                });
            }

            app.UseWebApi(config);
        }
    }

    public class MobileServiceInitializer : CreateDatabaseIfNotExists<MobileServiceContext>
    {
        protected override void Seed(MobileServiceContext context)
        {
            List<TodoItem> todoItems = new List<TodoItem>
            {
                new TodoItem { Id = Guid.NewGuid().ToString(), Text = "First item", Complete = false },
                new TodoItem { Id = Guid.NewGuid().ToString(), Text = "Second item", Complete = false }
            };

            foreach (TodoItem todoItem in todoItems)
            {
                context.Set<TodoItem>().Add(todoItem);
            }

            base.Seed(context);
        }
    }
}

身份验证启动代码：

// Startup.Auth.cs
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IdentityModel.Tokens;
using System.Linq;
using Microsoft.Owin.Security;
using Microsoft.Owin.Security.ActiveDirectory;
using Owin;

namespace MyAzureMobileApp
{
    public partial class Startup
    {
        // For more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?LinkId=301864
        public void ConfigureAuth(IAppBuilder app)
        {            
            app.UseWindowsAzureActiveDirectoryBearerAuthentication(
                new WindowsAzureActiveDirectoryBearerAuthenticationOptions
                {                    
                    Tenant = ConfigurationManager.AppSettings["ida:Tenant"],
                    AuthenticationMode = AuthenticationMode.Active,
                    TokenValidationParameters = new TokenValidationParameters()
                    {          
                        ValidAudience = ConfigurationManager.AppSettings["ida:Audience"],
                        ValidateIssuer = false
                    }
                });

        }
    }
}

服务实施：

using System.Web.Http;
using Microsoft.Azure.Mobile.Server.Config;

namespace MyAzureMobileApp.Controllers
{
    // Use the MobileAppController attribute for each ApiController you want to use  
    // from your mobile clients 
    [MobileAppController]
    // Use the MobileAppController attribute for each ApiController you want to use  
    // from your mobile clients 
    [Authorize]
    public class ValuesController : ApiController
    {
        // GET api/values
        public string Get()
        {
            return "GET returned: Hello World!";
        }

        // POST api/values
        public string Post()
        {
            return "POST returned: Hello World!";
        }
    }
}

我在web.config中的appSettings部分：

<appSettings>
    <add key="PreserveLoginUrl" value="true" />
    <!-- Use these settings for local development. After publishing to your
    Mobile App, these settings will be overridden by the values specified
    in the portal. -->
    <add key="MS_SigningKey" value="Overridden by portal settings" />
    <add key="EMA_RuntimeUrl" value="Overridden by portal settings" />
    <!-- When using this setting, be sure to add matching Notification Hubs connection
    string in the connectionStrings section with the name "MS_NotificationHubConnectionString". -->
    <add key="MS_NotificationHubName" value="Overridden by portal settings" />
    <add key="ida:ClientId" value="-- MyAzureMobileApp App ID from Azure AD --" />
    <add key="ida:Tenant" value="InternalTestAD.onmicrosoft.com" />
    <add key="ida:Audience" value="https://InternalTestAD.onmicrosoft.com/MyAzureMobileApp" />
    <add key="ida:Password" value="-- password value removed --" />        
  </appSettings>

除了作为WindowsAzureActiveDirectoryBearerAuthenticationOptions中TokenValidationParameters集合的属性之外，我没有看到指定有效令牌颁发者的位置 .

根据我对代码的理解，我应该禁用颁发者验证，但我尝试在此处添加外部Azure AD STS URL . 不幸的是，它似乎没有任何影响 .

有人知道这些代码是否因某种原因被忽略或覆盖？是否有其他设置我错过了完全禁用发行者验证，或指定有效发行人列表？

我当然可以按要求提供更多信息，我只是不确定其他什么可能相关 .

谢谢！