在Identity Server 4.Net Core中，我的外部授权请求不支持默认的请求状态参数值长度 [英] The default requested state parameter value length is not supported for my external authorization request in identity server 4 .Net Core

问题描述

1. Tried to customize the state parameter with the below code



options.Events = new OpenIdConnectEvents
                    {
                        OnRedirectToIdentityProvider = (RedirectContext context) =>
                        {
                            //context.ProtocolMessage.SetParameter("CustomParameter", "Test");
                            //context.Properties.Items.Add(OpenIdConnectDefaults.RedirectUriForCodePropertiesKey, context.ProtocolMessage.RedirectUri);
                            //context.ProtocolMessage.State = context.Options.StateDataFormat.Protect(context.Properties);
                            context.ProtocolMessage.State = Guid.NewGuid().ToString();
                            context.Response.Redirect(context.ProtocolMessage.CreateAuthenticationRequestUrl());
                            context.HandleResponse();
                            return Task.CompletedTask;
                        }

在使用外部登录屏幕进行身份验证后出现以下错误。

2021-08-25 15:17:52.713 +00:00 [ERR] An unhandled exception has occurred while executing the request.
System.Exception: An error was encountered while handling the remote login.
 ---> System.Exception: Unable to unprotect the message.State.
   --- End of inner exception stack trace ---
   at Microsoft.AspNetCore.Authentication.RemoteAuthenticationHandler`1.HandleRequestAsync()
   at IdentityServer4.Hosting.FederatedSignOut.AuthenticationRequestHandlerWrapper.HandleRequestAsync()
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext

上下文) 在IdentityServer4.Hosting.BaseUrlMiddleware.Invoke(HttpContext环境中) 在Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.g__Awaited|6_0(ExceptionHandlerMiddleware 中间件、HttpContext上下文、任务任务)

Q1: Is there any way to customize the state parameter value? Default generated value length is my only concern. 
Q2: Is it possible to set guid as status param value?

Please advise.

推荐答案

默认上下文身份验证属性由OnReDirectToIdentityProvider中的Protect方法加密，然后从身份验证成功状态，通过OnMessageReceired中的UnProtect方法解密。我们必须在稍后映射自定义GUID的数据和受保护的字符串之间来取消对身份验证属性的保护。

    options.Events = new OpenIdConnectEvents
                        {
                            OnRedirectToIdentityProvider = (RedirectContext context) =>
                            {
                                //context.ProtocolMessage.SetParameter("CustomParameter", "Test");
                                context.Properties.Items.Add(OpenIdConnectDefaults.RedirectUriForCodePropertiesKey, context.ProtocolMessage.RedirectUri); ;
                                context.ProtocolMessage.State = CacheHelper.SetMemoryCache(Guid.NewGuid().ToString(), context.Options.StateDataFormat.Protect(context.Properties));
                                context.Response.Redirect(context.ProtocolMessage.CreateAuthenticationRequestUrl());
                                context.HandleResponse();
                                return Task.CompletedTask;
                            },
                            OnMessageReceived = (MessageReceivedContext context) =>
                            {
                                context.ProtocolMessage.State = CacheHelper.GetMemoryCache(context.ProtocolMessage.State);
                                context.Properties = context.Options.StateDataFormat.Unprotect(context.ProtocolMessage.State);
                                return Task.CompletedTask;
                            },
                            OnAuthorizationCodeReceived = (AuthorizationCodeReceivedContext context) =>
                            {
                                return Task.CompletedTask;
                            }
                        };

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