Azure AD 多租戶、.Net Core Web API 和 MSAL（Microsoft 身份驗證庫）

Question

我相信我有 Microsoft 身份驗證庫 (MSAL) JavaScript 拉回 JWT 令牌，使用具有以下配置的 azure AD 多租戶。 基於此鏈接https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-convert-app-to-be-multi-tenant 。 我相信我只需要以下兩個值。

clientId: "A134d6c8-8078-2924-9e90-98cef862eb9a" // this would be the app registrations client id(application)
authority: "https://login.microsoftonline.com/common"

那么我如何配置一個 .net core 3 web api，它可以處理這個 JWT 令牌並通過我傳遞 Authorization: Bearer 標頭來驗證 [Authorize] 端點。

我目前在響應中收到此錯誤，這不是很有幫助！

AuthenticationFailed: IDX10511: Signature validation failed. Keys tried: '[PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.]'. 
kid: '[PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.]'. 
Exceptions caught:
 '[PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.]'.
token: '[PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.]'.

Startup.cs 代碼如下

using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.IdentityModel.Tokens;

namespace MultiTenantApi
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {

            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddCors(x =>
            {
                x.AddDefaultPolicy(cfg =>
                {
                    cfg.AllowAnyOrigin()
                        .AllowAnyHeader()
                        .AllowAnyMethod();
                });
            });

            services.AddAuthentication(cfg =>
                {
                    cfg.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                    cfg.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                })
                .AddJwtBearer(opt =>
                {
                    opt.Authority = "https://login.microsoftonline.com/common";
                    opt.Audience = "api://A134d6c8-8078-2924-9e90-98cef862eb9a"; // Set this to the App ID URL for the web API, which you created when you registered the web API with Azure AD.
                    opt.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuer = false
                    };
                    opt.Events = new JwtBearerEvents()
                    {
                        OnAuthenticationFailed = AuthenticationFailed
                    };
                });

            services.AddControllers();

        }

        private Task AuthenticationFailed(AuthenticationFailedContext arg)
        {
            // For debugging purposes only!
            var s = $"AuthenticationFailed: {arg.Exception.Message}";
            arg.Response.ContentLength = s.Length;
            arg.Response.Body.WriteAsync(Encoding.UTF8.GetBytes(s), 0, s.Length);
            return Task.FromResult(0);
        }
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseHttpsRedirection();

            app.UseStaticFiles(); // Added

            app.UseRouting();
            app.UseCors(); //Added

            app.UseAuthentication();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });

        }

    }
}

Answer 1

在您的ConfigureServices方法中，添加IdentityModelEventSource.ShowPII = true; 顯示錯誤的詳細信息並查看問題。

參考：

1. asp.net azure 活動目錄集成錯誤消息包含“[PII is hidden]”
2. PII 是隱藏的錯誤 #51