Question

我正在使用带有自定义STS的Windows Azure访问控制服务。我可以通过ACS登录我的应用程序，但是我在登出功能方面遇到了麻烦。我在我的应用程序中尝试过这段代码。

        WSFederationAuthenticationModule fam = FederatedAuthentication.WSFederationAuthenticationModule;

        try
        {
            FormsAuthentication.SignOut();
        }
        finally
        {
            fam.SignOut(true);
        }
        Page.Response.Redirect("default.aspx");

但它似乎从ACS注销用户而不是从自定义STS注销。从STS注销我该怎么办？在appliacation（RP），ACS或STS中可能出现问题？

我认为ACS应该要求自定义STS注销用户，但似乎它不会这样做。我缺少什么？

Answer 1

我已经为FederatedSignout创建了一个帮助方法，在代码中注释了我在路上发现的内容（hth）

public static void FederatedSignOut(string reply = null)
{
   WSFederationAuthenticationModule fam = FederatedAuthentication.WSFederationAuthenticationModule;

   // Native FederatedSignOut doesn't seem to have a way for finding/registering realm for singout, get it from the FAM
   string wrealm = string.Format("wtrealm={0}", fam.Realm);

   // Create basic url for signout (wreply is set by native FederatedSignOut)
   string signOutUrl = WSFederationAuthenticationModule.GetFederationPassiveSignOutUrl(fam.Issuer, null, wrealm);

   // Check where to return, if not set ACS will use Reply address configured for the RP
   string wreply = !string.IsNullOrEmpty(reply) ? reply : (!string.IsNullOrEmpty(fam.Reply) ? fam.Reply : null);

   WSFederationAuthenticationModule.FederatedSignOut(new Uri(signOutUrl), !string.IsNullOrEmpty(wreply) ? new Uri(wreply) : null);

   // Remarks! Native FederatedSignout has an option for setting signOutUrl to null, even if the documentation tells otherwise.
   // If set to null the method will search for signoutUrl in Session token, but I couldn't find any information about how to set this. Found some Sharepoint code that use this
   // Michele Leroux Bustamante had a code example (from 2010) that also uses this form.
   // Other examples creates the signout url manually and calls redirect.

   // FAM has support for wsignoutcleanup1.0 right out of the box, there is no need for code to handle this.
   // That makes it even harder to understand why there are no complete FederatedSignOut method in FAM

   // When using native FederatedSignOut() no events for signout will be called, if you need this use the FAM SignOut methods instead.
}

此代码用于我们为带有ACS的Web SSO创建的标准RP库。

Answer 2

2012年12月的ACS更新包括对联合单点注销的支持：

使用WS-Federation协议。使用ACS的Web应用程序   使用身份提供程序启用身份提供程序的单点登录（SSO）   WS-Federation协议现在可以利用单点注销   能力。当用户退出Web应用程序时，ACS可以   自动将用户从身份提供商中签出并退出   使用相同身份提供者的其他依赖方应用程序。

此功能适用于WS-Federation身份提供商，包括   Active Directory联合身份验证服务2.0和Windows Live ID   （微软帐户）。要启用单点注销，ACS会执行   以下WS-Federation协议端点任务：



ACS识别来自身份提供商的wsignoutcleanup1.0消息   并通过向依赖方发送wsignoutcleanup1.0消息进行响应   应用



ACS识别来自依赖方的wsignout1.0和wreply消息   应用程序并通过发送wsignout1.0消息进行身份响应   提供者和wsignoutcleanup1.0消息给依赖方   应用

从Code Sample: ASP.NET MVC 4 with Federated Sign-out，实施类似这样的行动，从ACS退出：

（请注意，Windows Identity Foundation现已合并到.NET 4.5 Framework中，这就是下面新命名空间的原因）

using System.IdentityModel.Services;
using System.IdentityModel.Services.Configuration;

public ActionResult Logout()
{
    // Load Identity Configuration
    FederationConfiguration config = FederatedAuthentication.FederationConfiguration;

    // Get wtrealm from WsFederationConfiguation Section
    string wtrealm = config.WsFederationConfiguration.Realm;
    string wreply;

    // Construct wreply value from wtrealm (This will be the return URL to your app)
    if (wtrealm.Last().Equals('/'))
    {
        wreply = wtrealm + "Logout";
    }
    else
    {
        wreply = wtrealm + "/Logout";
    }

    // Read the ACS Ws-Federation endpoint from web.Config
    // something like "https://<your-namespace>.accesscontrol.windows.net/v2/wsfederation"
    string wsFederationEndpoint = ConfigurationManager.AppSettings["ida:Issuer"];

    SignOutRequestMessage signoutRequestMessage = new SignOutRequestMessage(new Uri(wsFederationEndpoint));

    signoutRequestMessage.Parameters.Add("wreply", wreply);
    signoutRequestMessage.Parameters.Add("wtrealm", wtrealm);

    FederatedAuthentication.SessionAuthenticationModule.SignOut();

    string signoutUrl = signoutRequestMessage.WriteQueryString();

    return this.Redirect(signoutUrl);
}

使用自定义STS从访问控制服务注销

2 个答案: