如何强制注销网站的所有用户？

Question

我正在使用 MySQL Connector/.NET，它的所有提供程序都带有 FormsAuthentication。

我需要所有用户在某个时刻退出。 FormsAuthentication.SignOut() 方法不像我想要的那样工作。

如何注销所有站点用户？

Answer 1

正如 Joe 建议的那样，您可以编写一个 HttpModule 来使给定 DateTime 之前存在的任何 cookie 无效。如果你把它放在配置文件中，你可以在必要时添加/删除它。例如，

Web.config：

<appSettings>
  <add key="forcedLogout" value="30-Mar-2011 5:00 pm" />
</appSettings>

<httpModules>
  <add name="LogoutModule" type="MyAssembly.Security.LogoutModule, MyAssembly"/>
</httpModules>

MyAssembly.dll 中的 HttpModule：

public class LogoutModule: IHttpModule
{
    #region IHttpModule Members
    void IHttpModule.Dispose() { }
    void IHttpModule.Init(HttpApplication context)
    {
        context.AuthenticateRequest += new EventHandler(context_AuthenticateRequest);
    }
    #endregion


    /// <summary>
    /// Handle the authentication request and force logouts according to web.config
    /// </summary>
    /// <remarks>See "How To Implement IPrincipal" in MSDN</remarks>
    private void context_AuthenticateRequest(object sender, EventArgs e)
    {
        HttpApplication a = (HttpApplication)sender;
        HttpContext context = a.Context;

        // Extract the forms authentication cookie
        string cookieName = FormsAuthentication.FormsCookieName;
        HttpCookie authCookie = context.Request.Cookies[cookieName];
        DateTime? logoutTime = ConfigurationManager.AppSettings["forcedLogout"] as DateTime?;
        if (authCookie != null && logoutTime != null && authCookie.Expires < logoutTime.Value)
        {
            // Delete the auth cookie and let them start over.
            authCookie.Expires = DateTime.Now.AddDays(-1);
            context.Response.Cookies.Add(authCookie);
            context.Response.Redirect(FormsAuthentication.LoginUrl);
            context.Response.End();
        }
    }
}

Answer 2

基于@Bret's 很好的答案。我处理了一些场景，这些场景允许在用户登录（在或之后）配置文件中指定的日期后发生强制注销（无需计算未来的到期日期）。我相信如果 cookie 过期时间在强制注销日期之前，使用他的答案将导致用户不断被注销。此外，我不确定他是如何使用请求中的 cookie 检索 cookie 过期时间的。在我的尝试中，我总是收到 DateTime 默认值，如下所述：ASP.NET cookie expiration time is always 1/1/0001 12:00 AM

所以这里的想法是您需要将 cookie 创建 DateTime 添加到主体（注意：类型应该是可为空的 DateTime。如果已经对站点进行了此更改，这将允许处理正在使用 - 在此之前作为主体不包含此额外字段）。

您像他一样设置 web.config：

<configuration>
  <appSettings>
    <add key="forcedLogout" value="03-Feb-2021 10:46 pm" />
  </appSettings>
</configuration>

要将模块添加到web.config，你需要确定你是否使用application pool integrated mode vs application pool classic mode：

  <system.webServer><!--for integrated mode-->
    <modules>
      <add name="ForceLogoutModule" type="AssemblyName.NameSpace.ForceLogoutModule", AssemblyName />
    </modules>
  </system.webServer>

  <system.web><!--for classic mode-->
     <httpModules>
      <add name="ForceLogoutModule" type="AssemblyName.NameSpace.ForceLogoutModule", AssemblyName />
    </httpModules>
  </system.web>

或者您可以通过编程方式添加模块（在 global.asax 中）：

public static IHttpModule Module = new ForceLogoutModule();
public override void Init()
{
    base.Init();
    Module.Init(this);
}

然后你的 ForceLogout 模块（可以在同一个项目中）：

public class ForceLogoutModule : IHttpModule
{
    #region IHttpModule Members
    void IHttpModule.Dispose() { }
    void IHttpModule.Init(HttpApplication context)
    {
        context.AuthenticateRequest += new EventHandler(context_AuthenticateRequest);
    }
    #endregion


    /// <summary>
    /// Handle the authentication request and force logouts according to web.config
    /// </summary>
    /// <remarks>See "How To Implement IPrincipal" in MSDN</remarks>
    private void context_AuthenticateRequest(object sender, EventArgs e)
    {
        HttpContext context = ((HttpApplication)sender as HttpApplication).Context;
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        string cookieName = FormsAuthentication.FormsCookieName;
        HttpCookie authCookie = context.Request.Cookies[cookieName];
        if (authCookie == null)
            return;
        FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(authCookie.Value);
        CustomPrincipalSerializeModel principal = serializer.Deserialize<CustomPrincipalSerializeModel>(ticket.UserData);
        DateTime logoutTime;
        DateTime cookieCreation = ticket.IssueDate;

        if (!this.TryParseNullableToDate(ConfigurationManager.AppSettings["forcedLogout"], out logoutTime))
            return;


        if (!principal.Expiration.HasValue
            || (principal.Expiration.Value.ToLocalTime() > logoutTime && cookieCreation < logoutTime
            && DateTime.Now >= logoutTime.Date))
        {
            authCookie.Expires = DateTime.Now.AddDays(-1);
            context.Response.Cookies.Add(authCookie);
            context.Response.Redirect(FormsAuthentication.LoginUrl);
            context.Response.End();
        }
    }

    private bool TryParseNullableToDate(string value, out DateTime dateTime)
    {
        DateTime temp;
        if (string.IsNullOrWhiteSpace(value) || !DateTime.TryParse(value, out temp))
        {
            dateTime = DateTime.MinValue;
            return false;
        }

        dateTime = temp;
        return true;
    }
}