ASP.Net Core使用AAD和B2C进行身份验证

Question

我们在ASP.Net Core 2.2中编写了一个web api，我们想要针对AAD或B2C对用户进行身份验证。这意味着我们有一些端点只能由AAD用户访问，其他端点由B2C用户访问，有些则由两者共享。

在Startup.cs中我们有

services.AddAuthentication(AzureADB2CDefaults.BearerAuthenticationScheme)
   .AddAzureADB2CBearer(options => Configuration.Bind("AzureAdB2C", options));

services.AddAuthentication(AzureADDefaults.BearerAuthenticationScheme)
   AddAzureADBearer(options => Configuration.Bind("AzureAd", options));

单独这些工作，但当我们尝试同时添加两个配置时，都不起作用。

我也试过了

services.AddAuthentication(AzureADDefaults.BearerAuthenticationScheme)
   .AddAzureADBearer(options => Configuration.Bind("AzureAd", options))
   .AddAzureADB2CBearer(options => Configuration.Bind("AzureAdB2C", options));

但似乎都不起作用。我们怎么做到这一点？

Answer 1

您不需要像上面那样对两者进行配置。

您只需在代码中配置B2C，然后您需要在Azure B2C中使用自定义策略。您需要将Azure AD定义为Azure B2C可以通过端点与之通信的声明提供程序。这将允许用户使用Azure AD或社交帐户登录。

查找详细的参考here at Microsoft Docs。

Answer 2

我也面临类似的问题，并通过自定义政策实现。以下是身份验证代码。

public static void AddAuthorization(this IServiceCollection services, IConfigurationRoot configuration)
    {
        services.AddAuthentication()
            .AddJwtBearer("AAD", options =>
            {
                options.MetadataAddress = configuration["AzureAd:Instance"] + configuration["AzureAd:TenantId"] +
                                          "/v2.0/.well-known/openid-configuration";
                options.Authority = configuration["AzureAd:Instance"] + configuration["AzureAd:TenantId"];
                options.Audience = configuration["AzureAd:ClientId"];
                options.TokenValidationParameters =
                    new TokenValidationParameters
                    {
                        ValidIssuer = $"https://sts.windows.net/{configuration["AzureAd:TenantId"]}/",
                    };
                options.Events = new JwtBearerEvents
                {
                    OnMessageReceived = context => Task.CompletedTask,
                    OnChallenge = context => Task.CompletedTask,
                    OnAuthenticationFailed = (context) =>
                    {
                        Console.WriteLine("OnAuthenticationFailed: " + context.Exception.Message);
                        return Task.CompletedTask;
                    },
                    OnTokenValidated = context =>
                    {
                        Console.WriteLine("Validated: " + context.SecurityToken);
                        return Task.CompletedTask;
                    }
                };
            })
            .AddJwtBearer("B2C", options =>
        {
            options.Authority = configuration["AzureAdB2C:Instance"] + configuration["AzureAdB2C:Domain"] + "/" + configuration["AzureAdB2C:SignUpSignInPolicyId"] + "/v2.0";
            options.Audience = configuration["AzureAdB2C:ClientId"];

            options.Events = new JwtBearerEvents
            {
                OnMessageReceived = context => Task.CompletedTask,
                OnChallenge = context => Task.CompletedTask,
                OnAuthenticationFailed = (context) =>
                {
                    Console.WriteLine("OnAuthenticationFailed: " + context.Exception.Message);
                    return Task.CompletedTask;
                },
                OnTokenValidated = context =>
                {
                    Console.WriteLine("Validated: " + context.SecurityToken);
                    return Task.CompletedTask;
                }
            };
        });
        services
            .AddAuthorization(options =>
            {
                options.AddPolicy("AADUsers", new AuthorizationPolicyBuilder()
                    .RequireAuthenticatedUser()
                    .AddAuthenticationSchemes("AAD")
                    .Build());

                options.AddPolicy("B2CUsers", new AuthorizationPolicyBuilder()
                    .RequireAuthenticatedUser()
                    .AddAuthenticationSchemes("B2C")
                    .Build());
            });
    }

在startup.cs中，在ConfigureServices中添加以下代码

services.AddAuthorization(Configuration);

现在在您的控制器中，您可以基于AD或B2CAD进行这样的装饰

[Authorize(Policy = "B2CUsers")] // For B2C authentication
[Authorize(Policy = "AADUsers")] // For AAD authentication