题记：在ASP.NET 5中虽然继续可以沿用ASP.NET Identity来做验证授权，不过也可以很容易集成支持标准协议的第三方服务，比如Azure Active Directory。
其实，在ASP.NET 5中集成AzureAD，利用其进行验证和授权，是非常简单的。因为：首先Azure Active Directory提供了OAuth2.0、OpenId Connect 1.0、SAML和WS-Federation 1.2标准协议接口；其次微软在ASP.NET 5中移植了集成OpenId Connect的OWIN中间件。所以，只要在ASP.NET 5项目中引用"Microsoft.AspNet.Authentication.OpenIdConnect"这个包，并正确配置AzureAD的连接信息，就可以很容易的进行集成。
大致步骤如下：
1，在config.json文件中添加AzureAD的配置信息：
"AzureAd": {
"ClientId": "[Enter the clientId of your application as obtained from portal, e.g. ba74781c2-53c2-442a-97c2-3d60re42f403]",
"Tenant": "[Enter the name of your tenant, e.g. contoso.onmicrosoft.com]",
"AadInstance": "https://login.microsoftonline.com/{0}", // This is the public instance of Azure AD
"PostLogoutRedirectUri": https://localhost:44322/
}
2，修改project.json，引入OpenIdConnect的中间件：
"Microsoft.AspNet.Authentication.OpenIdConnect": "1.0.0-*"
3，在Startup中的ConfigureServices方法里面添加：
// OpenID Connect Authentication Requires Cookie Auth
services.Configure<ExternalAuthenticationOptions>(options =>
{
options.SignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
});
4，在Startup中的Configure方法里面添加：
// Configure the OWIN Pipeline to use Cookie Authentication
app.UseCookieAuthentication(options =>
{
// By default, all middleware are passive/not automatic. Making cookie middleware automatic so that it acts on all the messages.
options.AutomaticAuthentication = true;
});
// Configure the OWIN Pipeline to use OpenId Connect Authentication
app.UseOpenIdConnectAuthentication(options =>
{
options.ClientId = Configuration.Get("AzureAd:ClientId");
options.Authority = String.Format(Configuration.Get("AzureAd:AadInstance"), Configuration.Get("AzureAd:Tenant"));
options.PostLogoutRedirectUri = Configuration.Get("AzureAd:PostLogoutRedirectUri");
options.Notifications = new OpenIdConnectAuthenticationNotifications
{
AuthenticationFailed = OnAuthenticationFailed,
};
});
5，Startup的OnAuthenticationFailed方法为：
private Task OnAuthenticationFailed(AuthenticationFailedNotification<OpenIdConnectMessage, OpenIdConnectAuthenticationOptions> notification)
{
notification.HandleResponse();
notification.Response.Redirect("/Home/Error" + notification.Exception.Message);
return Task.FromResult(0);
}
6，添加一个名为AccountController的Controller：
public class AccountController : Controller
{
// GET: /Account/Login
[HttpGet]
public IActionResult Login()
{
if (Context.User == null || !Context.User.Identity.IsAuthenticated)
return new ChallengeResult(OpenIdConnectAuthenticationDefaults.AuthenticationScheme, new AuthenticationProperties { RedirectUri = "/" });
return RedirectToAction("Index", "Home");
}
// GET: /Account/LogOff
[HttpGet]
public IActionResult LogOff()
{
if (Context.User.Identity.IsAuthenticated)
{
Context.Authentication.SignOut(CookieAuthenticationDefaults.AuthenticationScheme);
Context.Authentication.SignOut(OpenIdConnectAuthenticationDefaults.AuthenticationScheme);
}
return RedirectToAction("Index", "Home");
}
}
以上代码也可以到我Fork的完整示例项目中找到：https://github.com/heavenwing/WebApp-OpenIdConnect-AspNet5
【更新：2015-07-16】
如果你遇到添加了 [Authorize] ，但是不能自动转到登录页面的情况，那么需要：
app.UseOpenIdConnectAuthentication(options => {
options.AutomaticAuthentication = true;
});
具体见：https://github.com/aspnet/Security/issues/357#issuecomment-120834369
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