DataProtection设置问题引起不同ASP.NET Core站点无法共享用户验证Cookie

这是这两天ASP.NET Core迁移中遇到的一个问题。2个ASP.NET Core站点(对应于2个不同的ASP.NET Core Web应用程序),2个站点都可以登录,但在其中任1个站点登录后,在当前站点处于登录状态,访问另外1个站点却处于未登录状态。

开始以为是CookieAuthenticationOptions的设置不一致引起的,检查代码后确认AuthenticationScheme,CookieName,CookieDomain都是一样的。

app.UseCookieAuthentication(new CookieAuthenticationOptions
{
    CookieName = ".AspNetCore.Cookies",
    CookieDomain = ".cnblogs.com"
});

(AuthenticationScheme的默认值是"Cookies")

之后怀疑是DataProtection的密钥不一致引起的,我们用的是同一个阿里云redis实例存储密钥,存储方式上不会造成不一致。

if (Environment.IsDevelopment())
{
    services.AddDistributedMemoryCache();
}
else
{
    services.AddDistributedServiceStackRedisCache(options =>
    {
        Configuration.GetSection("redis").Bind(options);
        //Workaround for deadlock when resolving host name
        IPAddress ip;
        if (!IPAddress.TryParse(options.Host, out ip))
        {
            options.Host = Dns.GetHostAddressesAsync(options.Host)
            .Result.FirstOrDefault(a => a.AddressFamily == AddressFamily.InterNetwork).ToString();
        }
    });
}
services.AddDataProtection().PersistKeysToDistributedStore();

为了进一步确认密钥是否是一样的,修改了 DataProtection.DistributedStore 的源代码将密钥打印在控制台,运行后确认2个站点用的密钥是一样的。

public IReadOnlyCollection<XElement> GetAllElements()
{
    var data = _cache.GetString(_key);
    Console.WriteLine(data);
    if (!string.IsNullOrEmpty(data))
    {
        return XDocument.Parse(data).Root.Elements().ToList().AsReadOnly();
    }
    else
    {
        return new List<XElement>().AsReadOnly();
    }
}

后来突然想到 services.AddDataProtection() 是不是有什么配置选项?F12之后发现果然有个DataProtectionOptions:

public static IDataProtectionBuilder AddDataProtection(this IServiceCollection services, Action<DataProtectionOptions> setupAction);

继续F12发现DataProtectionOptions只有1个属性ApplicationDiscriminator,点开它的注释后,问题的答案跃然而出:

//
// Summary:
//     Provides global options for the Data Protection system.
public class DataProtectionOptions
{
    public DataProtectionOptions();

    //
    // Summary:
    //     An identifier that uniquely discriminates this application from all other applications
    //     on the machine. The discriminator value is implicitly included in all protected
    //     payloads generated by the data protection system to isolate multiple logical
    //     applications that all happen to be using the same key material.
    //
    // Remarks:
    //     If two different applications need to share protected payloads, they should ensure
    //     that this property is set to the same value across both applications.
    public string ApplicationDiscriminator { get; set; }
}

原来不同的ASP.NET Core应用程序要使用同样的加解密方式,除了共享密钥,还要设置同样的ApplicationDiscriminator。

添加如下的代码后问题立马解决。

services.AddDataProtection(options => options.ApplicationDiscriminator = "cnblogs.com");
posted @ 2017-03-03 12:58 dudu 阅读(...) 评论(...) 编辑 收藏