ASP.Net身份标识slidingexpiration设置为true不会重新发出cookie

时间:2016-08-16 19:40:53

标签: c# cookies asp.net-identity expired-cookies

我正在使用ASP.Net身份验证来控制我的应用程序授权,我需要在指定的几分钟不活动后终止用户会话,我试图通过执行以下方法来解决这个问题

public void ConfigureAuth(IAppBuilder app) {
    app.CreatePerOwinContext<UserStore>(() => new UserStore());
    app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);

    app.UseCookieAuthentication(new CookieAuthenticationOptions {
        AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
        LoginPath = new PathString("/login"),
        LogoutPath = new PathString("/logout"),
        CookieDomain = ConfigurationManager.AppSettings["CookieDomain"],
        Provider = new CookieAuthenticationProvider {
            // Enables the application to validate the security stamp when the user logs in.
            // This is a security feature which is used when you change a password or add an external login to your account.  
            OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
                validateInterval: TimeSpan.FromMinutes(2),
                regenerateIdentity: (manager, user) => manager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie)
            )
        },
        SlidingExpiration = true,
    });
}

我也试过这个方法

app.UseCookieAuthentication(new CookieAuthenticationOptions {
    AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
    LoginPath = new PathString("/login"),
    LogoutPath = new PathString("/logout"),
    CookieDomain = ConfigurationManager.AppSettings["CookieDomain"],
    ExpireTimeSpan = TimeSpan.FromMinutes(2),
    SlidingExpiration = true,
});

使用那些aproches用户cookie会话在2分钟后过期,无论用户是否在站点中处于活动状态。我在文档中读到,通过设置SlidingExpiration = true,可以在ExpireTimeSpan中途的任何请求中重新发出cookie。例如,如果用户登录并在16分钟后再发出第二个请求,则会再次发出cookie 30分钟。如果用户登录,然后在31分钟后发出第二个请求,则会提示用户登录。

我不知道为什么它不起作用,有什么想法?

2 个答案:

答案 0 :(得分:0)

要清楚:CookieHandler正在检查直到cookie过期的剩余时间是否小于自发出问题(意味着它已过期一半)之前经过的时间,然后才请求刷新。这在Microsoft.AspNetCore.Authentication.Cookies的dll中。

就个人而言,我希望可以选择一个选项来更改经过的百分比。当您使用较小的超时(15分钟或更短的时间)来获得更安全的应用程序时,仅在闲置7分钟后才使用户超时,这是因为cookie在它们处于活动状态的前6分钟从未刷新过,这非常令人讨厌。
也许添加一个选项来使用剩余时间跨度检查而不是常数。例如,当Cookie剩余的时间少于{TimeSpan}时,发出刷新请求。

private void CheckForRefresh(AuthenticationTicket ticket)
{
  DateTimeOffset utcNow = this.get_Clock().get_UtcNow();
  DateTimeOffset? issuedUtc = ticket.get_Properties().get_IssuedUtc();
  DateTimeOffset? expiresUtc = ticket.get_Properties().get_ExpiresUtc();
  bool? allowRefresh = ticket.get_Properties().get_AllowRefresh();
  bool flag = !allowRefresh.HasValue || allowRefresh.GetValueOrDefault();
  if (((!issuedUtc.HasValue || !expiresUtc.HasValue ? 0 : (this.get_Options().SlidingExpiration ? 1 : 0)) & (flag ? 1 : 0)) == 0)
    return;
  TimeSpan timeSpan = utcNow.Subtract(issuedUtc.Value);
  if (!(expiresUtc.Value.Subtract(utcNow) < timeSpan))
    return;
  this.RequestRefresh(ticket);
}

答案 1 :(得分:0)

我怀疑问题是尽管SlidingExpiration为true,刷新行为仍受到抑制。查看Katana源代码,CookieAuthenticationHandler类,AuthenticateCoreAsync()方法,我们看到:

bool? allowRefresh = ticket.Properties.AllowRefresh;
if (issuedUtc != null && expiresUtc != null && Options.SlidingExpiration
    && (!allowRefresh.HasValue || allowRefresh.Value))
{
    TimeSpan timeElapsed = currentUtc.Subtract(issuedUtc.Value);
    TimeSpan timeRemaining = expiresUtc.Value.Subtract(currentUtc);

    if (timeRemaining < timeElapsed)
    {
    _shouldRenew = true;
    _renewIssuedUtc = currentUtc;
    TimeSpan timeSpan = expiresUtc.Value.Subtract(issuedUtc.Value);
    _renewExpiresUtc = currentUtc.Add(timeSpan);
    }
}

即仅当ticket.Properties.AllowRefresh为null或true时,刷新才会发生,并且根据您使用的中间件的不同,可以将其设置为false。例如。在OpenIdConnectAuthenticationHandler和WsFederationAuthenticationHandler中,我们有这个...

private ClaimsPrincipal ValidateToken(...)
{
    ...
    if (Options.UseTokenLifetime)
    {
        // Override any session persistence to match the token lifetime.
        DateTime issued = jwt.ValidFrom;
        if (issued != DateTime.MinValue)
        {
            properties.IssuedUtc = issued.ToUniversalTime();
        }
        DateTime expires = jwt.ValidTo;
        if (expires != DateTime.MinValue)
        {
            properties.ExpiresUtc = expires.ToUniversalTime();
        }
        properties.AllowRefresh = false;
    }
}

请注意UseTokenLifetime默认为true。因此,deault行为是使用从IdP服务器获得的身份验证令牌中的有效时间,并在达到该有效时间时结束会话,而不管用户是否处于活动状态。