如何在 Mono HTTPListener 服务器中捕获 SSL 异常?

How to I catch SSL exceptions in a Mono HTTPListener server?(如何在 Mono HTTPListener 服务器中捕获 SSL 异常?)

问题描述

我正在尝试将 HTTPS 支持添加到我的简单 Mono HTTP 服务器.它在大多数情况下都能完美运行，但是当发生 SSL 异常时应用程序崩溃，例如客户端取消握手.显然，这样的事情不应该完全崩溃，所以我需要以某种方式捕获该异常.

I'm trying to add HTTPS support to my simple Mono HTTP server. It works perfectly most of the time, but the application crashes when an SSL exception occurs, such as the client canceling the handshake. Obviously something like that shouldn't completely crash it, so I need to catch that exception somehow.

代码:

    static void Main(string[] args)
    {
        try
        {
            var listener = new HttpListener();
            string prefix = "https://*:8443/";
            listener.Prefixes.Add(prefix);

            Console.WriteLine("Starting HTTP server at " + prefix);

            listener.Start();

            while (true)
            {
                try
                {
                    var context = listener.GetContext();
                    Console.WriteLine(context.Request.Url);
                }
                catch (Exception e)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine("Exception processing request: " + e);
                    Console.ResetColor();
                }
            }
        }
        catch (Exception e)
        {
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine("Exception caught! " + e);
        }
    }

这是我遇到一个不稳定的客户端尝试连接时的日志:

Here's the log when I get a wonky client trying to connect:

Starting HTTP server at https://*:8443/

Unhandled Exception:
System.IO.IOException: The authentication or decryption has failed. ---> Mono.Security.Protocol.Tls.TlsException: The client stopped the handshake.
  at Mono.Security.Protocol.Tls.SslServerStream.EndNegotiateHandshake (IAsyncResult asyncResult) <0x41e581b0 + 0x0022b> in <filename unknown>:0
  at Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback (IAsyncResult asyncResult) <0x41e57d20 + 0x00086> in <filename unknown>:0
  --- End of inner exception stack trace ---
  at Mono.Security.Protocol.Tls.SslStreamBase.EndRead (IAsyncResult asyncResult) <0x41e50110 + 0x0015f> in <filename unknown>:0
  at Mono.Net.Security.Private.LegacySslStream.EndAuthenticateAsServer (IAsyncResult asyncResult) <0x41e50000 + 0x0003e> in <filename unknown>:0
  at Mono.Net.Security.Private.LegacySslStream.AuthenticateAsServer (System.Security.Cryptography.X509Certificates.X509Certificate serverCertificate, Boolean clientCertificateRequired, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation) <0x41e40990 + 0x00055> in <filename unknown>:0
  at System.Net.HttpConnection.Init () <0x41e3e0e0 + 0x0005f> in <filename unknown>:0
  at System.Net.HttpConnection..ctor (System.Net.Sockets.Socket sock, System.Net.EndPointListener epl, Boolean secure, System.Security.Cryptography.X509Certificates.X509Certificate cert) <0x41e3b670 + 0x003e7> in <filename unknown>:0
  at System.Net.EndPointListener.OnAccept (System.Object sender, System.EventArgs e) <0x41e3b210 + 0x002a7> in <filename unknown>:0
  at System.Net.Sockets.SocketAsyncEventArgs.OnCompleted (System.Net.Sockets.SocketAsyncEventArgs e) <0x41e3b1d0 + 0x0002e> in <filename unknown>:0
  at System.Net.Sockets.SocketAsyncEventArgs.Complete () <0x41e3b1b0 + 0x00013> in <filename unknown>:0
  at System.Net.Sockets.Socket.<AcceptAsyncCallback>m__0 (IAsyncResult ares) <0x41e3aa70 + 0x0037f> in <filename unknown>:0
  at System.Net.Sockets.SocketAsyncResult+<Complete>c__AnonStorey0.<>m__0 (System.Object _) <0x41e3a980 + 0x0001d> in <filename unknown>:0
  at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem () <0x7f22cac25460 + 0x0002f> in <filename unknown>:0
  at System.Threading.ThreadPoolWorkQueue.Dispatch () <0x7f22cac239e0 + 0x001d6> in <filename unknown>:0
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () <0x7f22cac252e0 + 0x00008> in <filename unknown>:0

推荐答案

不是一个很好的解决方案，但我能够通过使用 nginx 创建本地反向代理并将单服务器设置为仅侦听 127.0 来解决此问题.0.1

Not quite a solution, but I was able to work around the problem by creating a local reverse proxy with nginx, and setting the mono server to only listen on 127.0.0.1

https://www.nginx.com/resources/admin-guide/reverse-proxy/

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