Azure AD B2C - 角色管理

Question

我有一个与 Azure AD B2C 连接的 Asp.NET MVC 应用程序。

在管理员设置中我创建了一个管理员组：

在我的代码中我想使用[Authorize(Roles = "Administrator")]

使用常规 Azure Active Directory 很容易添加（只需 3 行代码）。但是对于 Azure AD B2C，我在网络上找不到任何有效的教程或示例。也许你可以告诉我我需要修改什么。

这是我的 Startup.Auth.cs 的 ConfigureAuth 方法

public void ConfigureAuth(IAppBuilder app)
{
    app.SetDefaultSignInAsAuthenticationType(CookieAuthenticationDefaults.AuthenticationType);

    app.UseCookieAuthentication(new CookieAuthenticationOptions());

    app.UseOpenIdConnectAuthentication(
        new OpenIdConnectAuthenticationOptions
        {
            // Generate the metadata address using the tenant and policy information
            MetadataAddress = String.Format(AadInstance, Tenant, DefaultPolicy),

            // These are standard OpenID Connect parameters, with values pulled from web.config
            ClientId = ClientId,
            RedirectUri = RedirectUri,
            PostLogoutRedirectUri = RedirectUri,

            // Specify the callbacks for each type of notifications
            Notifications = new OpenIdConnectAuthenticationNotifications
            {
                RedirectToIdentityProvider = OnRedirectToIdentityProvider,
                AuthorizationCodeReceived = OnAuthorizationCodeReceived,
                AuthenticationFailed = OnAuthenticationFailed,
            },

            // Specify the claims to validate
            TokenValidationParameters = new TokenValidationParameters
            {
                NameClaimType = "name"
            },

            // Specify the scope by appending all of the scopes requested into one string (separated by a blank space)
            Scope = $"openid profile offline_access {ReadTasksScope} {WriteTasksScope}"
        }
    );
}

Answer 1

Azure AD B2C 尚未在其发送到应用程序的令牌中包含组声明，因此您无法采用与 Azure AD 概述的相同方法（其中确实包含组声明令牌）。

您可以在 Azure AD B2C 反馈论坛中投票支持此功能：Get user membership groups in the claims with Azure AD B2C

话虽如此，您可以在此应用程序中做一些额外的工作，让它手动检索组声明的这些声明并将它们注入到令牌中。

首先，注册一个单独的应用程序，该应用程序将调用 Microsoft Graph 来检索组声明。

1. 转到https://apps.dev.microsoft.com
2. 使用应用程序权限创建一个应用程序：Directory.Read.All。
3. 通过单击生成新密码添加应用程序密码
4. 添加平台并选择 Web 并为其提供任何重定向 URI（例如 https://yourtenant.onmicrosoft.com/groups）
5. 导航至：https://login.microsoftonline.com/YOUR_TENANT.onmicrosoft.com/adminconsent?client_id=YOUR_CLIENT_ID&state=12345&redirect_uri=YOUR_REDIRECT_URI 同意此应用程序

然后，您将需要在OnAuthorizationCodeReceived 处理程序中添加以下代码、right after redeeming the code：

var authority = $"https://login.microsoftonline.com/{Tenant}";
var graphCca = new ConfidentialClientApplication(GraphClientId, authority, GraphRedirectUri, new ClientCredential(GraphClientSecret), userTokenCache, null);
string[] scopes = new string[] { "https://graph.microsoft.com/.default" };

try
{
    AuthenticationResult authenticationResult = await graphCca.AcquireTokenForClientAsync(scopes);
    string token = authenticationResult.AccessToken;

    using (var client = new HttpClient())
    {
        string requestUrl = $"https://graph.microsoft.com/v1.0/users/{signedInUserID}/memberOf?$select=displayName";

        HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, requestUrl);
        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);

        HttpResponseMessage response = await client.SendAsync(request);
        var responseString = await response.Content.ReadAsStringAsync();

        var json = JObject.Parse(responseString);

        foreach (var group in json["value"])
            notification.AuthenticationTicket.Identity.AddClaim(new System.Security.Claims.Claim(System.Security.Claims.ClaimTypes.Role, group["displayName"].ToString(), System.Security.Claims.ClaimValueTypes.String, "Graph"));

        //TODO: Handle paging. 
        // https://developer.microsoft.com/en-us/graph/docs/concepts/paging
        // If the user is a member of more than 100 groups, 
        // you'll need to retrieve the next page of results.
    }
} catch (Exception ex)
{
    //TODO: Handle
    throw;
}