在 MVC 应用程序中获取访问令牌答案

【问题标题】：Get access token in MVC application在 MVC 应用程序中获取访问令牌
【发布时间】：2016-07-15 05:15:55
【问题描述】：

我正在尝试检索访问令牌，以便可以存储它，并稍后将其传递给 ExchangeService。 Startup.Auth 看起来像这样：

 app.UseOpenIdConnectAuthentication(
            new OpenIdConnectAuthenticationOptions
            {
                ClientId = clientId,
                Authority = authority,
                UseTokenLifetime = false,
                /*
                * Skipping the Home Realm Discovery Page in Azure AD
                * http://www.cloudidentity.com/blog/2014/11/17/skipping-the-home-realm-discovery-page-in-azure-ad/
                */
                Notifications = new OpenIdConnectAuthenticationNotifications
                {
                    RedirectToIdentityProvider = OpenIdConnectNotification.RedirectToIdentityProvider,
                    MessageReceived = OpenIdConnectNotification.MessageReceived,
                    SecurityTokenReceived = OpenIdConnectNotification.SecurityTokenReceived,
                    SecurityTokenValidated = OpenIdConnectNotification.SecurityTokenValidated,
                    AuthorizationCodeReceived = OpenIdConnectNotification.AuthorizationCodeReceived,
                    AuthenticationFailed = OpenIdConnectNotification.AuthenticationFailed
                },

            });

然后在 SecurityTokenValidated 中我这样做了：

public static async Task<Task>  SecurityTokenValidated(SecurityTokenValidatedNotification<OpenIdConnectMessage, OpenIdConnectAuthenticationOptions> context)
    {
        string aadInstance = ConfigurationManager.AppSettings["ida:AADInstance"];
        string clientId = ConfigurationManager.AppSettings["ida:ClientId"];
        var authContext = new AuthenticationContext(aadInstance + "/oauth2/token", false);
        var authResult =await authContext.AcquireTokenByAuthorizationCodeAsync(context.ProtocolMessage.Code,
            new Uri(aadInstance), new ClientAssertion(clientId, "‎5a95f1c6be7bf3c61f6392ec84ddd044acef61d9"));
        var accessToken = authResult.Result.AccessToken;
        context.AuthenticationTicket.Identity.AddClaim(new Claim("access_token", accessToken));
        return Task.FromResult(0);
    }

我没有收到任何错误，但应用程序在此行挂起：

 var accessToken = authResult.Result.AccessToken;

ClientAssertion 是使用我在 IIS 中安装的 SSL 证书的指纹构造的，不确定证书是否是错误的类型...

更新：我更新了 SecurityTokenValidated 以反映 Saca 的评论，但我收到“AADSTS50027：无效的 JWT 令牌。令牌格式无效”错误。我也试过这段代码：

   string aadInstance = ConfigurationManager.AppSettings["ida:AADInstance"];
            string clientId = ConfigurationManager.AppSettings["ida:ClientId"];
            var authContext = new AuthenticationContext(aadInstance, false);
            var cert = new X509Certificate2("...", "...");
            var cacert = new ClientAssertionCertificate(clientId, cert);
            var authResult = await authContext.AcquireTokenByAuthorizationCodeAsync(context.ProtocolMessage.Code, new Uri(aadInstance), cacert);
            var accessToken = authResult.AccessToken;
            context.AuthenticationTicket.Identity.AddClaim(new Claim("access_token", accessToken));
            return Task.FromResult(0);

但是这样我得到“AADSTS70002：验证凭据时出错。AADSTS50012：客户端断言包含无效签名。”

【问题讨论】：

标签： asp.net-mvc oauth-2.0 owin azure-active-directory

【解决方案1】：

应用程序挂起，因为您通过访问 authResult 的 .Result 阻塞了异步任务的结果。

您应该将其更改为：

public static async Task SecurityTokenValidated(SecurityTokenValidatedNotification<OpenIdConnectMessage, OpenIdConnectAuthenticationOptions> context)
{
    string aadInstance = ConfigurationManager.AppSettings["ida:AADInstance"];
    string clientId = ConfigurationManager.AppSettings["ida:ClientId"];
    var authContext = new AuthenticationContext(aadInstance + "/oauth2/token", false);
    var authResult = await authContext.AcquireTokenByAuthorizationCodeAsync(context.ProtocolMessage.Code,
        new Uri(aadInstance), new ClientAssertion(clientId, "‎5a95f1c6be7bf3c61f6392ec84ddd044acef61d9"));
    var accessToken = authResult.AccessToken;
    context.AuthenticationTicket.Identity.AddClaim(new Claim("access_token", accessToken));
}

【讨论】：

这修复了悬挂部分，但我仍然没有 access_token。应用程序加载，然后当我尝试访问令牌时，声明不存在......
嗯...我认为 chrome 缓存了一些东西，因为我尝试在 IE 中进行测试，但我收到了一个错误的请求，这解释了丢失的令牌。现在的问题是如何找出我的请求有什么问题？ :(

【解决方案2】：

我设法获得了访问令牌：

 public static async Task<Task> SecurityTokenValidated(SecurityTokenValidatedNotification<OpenIdConnectMessage, OpenIdConnectAuthenticationOptions> context)
    {
        string aadInstance = ConfigurationManager.AppSettings["ida:AADInstance"];
        string clientId = ConfigurationManager.AppSettings["ida:ClientId"];
        string clientSecret = ConfigurationManager.AppSettings["ida:ClientSecret"];
        string source = ConfigurationManager.AppSettings["ExchangeOnlineId"];

        var authContext = new AuthenticationContext(aadInstance, false);
        var credentials = new ClientCredential(clientId, clientSecret);
        var appRedirectUrl = context.Request.Scheme + "://" + context.Request.Host + context.Request.PathBase + "/";
        var authResult = await authContext.AcquireTokenByAuthorizationCodeAsync(context.ProtocolMessage.Code, new Uri(appRedirectUrl), credentials, source);
        var accessToken = authResult.AccessToken;
        var applicationUserIdentity = new ClaimsIdentity(context.OwinContext.Authentication.User.Identity);
        applicationUserIdentity.AddClaim(new Claim("AccessToken", accessToken));
        context.OwinContext.Authentication.User.AddIdentity(applicationUserIdentity);
        return Task.FromResult(0);
    }

最初我想使用 ClientAssertion，这样我就不必公开客户端 Secret，但管理证书的工作量太大...

【讨论】：