.Net SslStream 与客户端证书

Question

我没有运气让客户端证书与我的 SslStream 项目一起使用。 无论我做什么，我都无法让它实际使用客户端证书，尽管事实上所有证书都是有效且受信任的，并且我已经为我自己生成的证书导入了 CA 证书，但它只是没有工作。 我一定遗漏了一些东西，但我已经经历了几十次，查看了文档、示例和数小时的谷歌搜索，但我就是无法让它工作。 我究竟做错了什么？

客户端：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Security;
using System.Net.Sockets;
using System.Reflection;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace SslClient
{
    class SslClientProgram
    {
        static void Main(string[] args)
        {
            TcpClient client = new TcpClient("localhost", 443);

            SslStream stream = new SslStream(client.GetStream(), false, VerifyServerCertificate, null);

            Assembly assembly = System.Reflection.Assembly.GetExecutingAssembly();
            string location = assembly.Location;
            int pos = location.LastIndexOf('\\');
            location = location.Substring(0, pos);
            X509Certificate2 certificate = new X509Certificate2(location + "\\my.client.certificate.pfx", "password");

            stream.AuthenticateAsClient("my.host.name", new X509Certificate2Collection(certificate), System.Security.Authentication.SslProtocols.Tls, false);

            StreamReader reader = new StreamReader(stream);
            StreamWriter writer = new StreamWriter(stream);

            while (true)
            {
                string line = System.Console.ReadLine();
                writer.WriteLine(line);
                writer.Flush();
                if (line == "close") break;
                line = reader.ReadLine();
                System.Console.WriteLine("Received: {0}", line);
            }

            stream.Close();
        }

        private static bool VerifyServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }
    }
}

服务器：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Security;
using System.Net.Sockets;
using System.Reflection;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace SslServer
{
    class SslServerProgram
    {
        static void Main(string[] args)
        {
            TcpListener server = new TcpListener(System.Net.IPAddress.Loopback, 443);

            server.Start();

            TcpClient client = server.AcceptTcpClient();

            SslStream stream = new SslStream(client.GetStream(), false, VerifyClientCertificate, null);

            Assembly assembly = System.Reflection.Assembly.GetExecutingAssembly();
            string location = assembly.Location;
            int pos = location.LastIndexOf('\\');
            location = location.Substring(0, pos);
            X509Certificate2 certificate = new X509Certificate2(location + "\\my.server.certificate.pfx", "password");

            stream.AuthenticateAsServer(certificate, false, System.Security.Authentication.SslProtocols.Tls, false);

            if (stream.RemoteCertificate != null)
            {
                System.Console.WriteLine(stream.RemoteCertificate.Subject);
            }
            else
            {
                System.Console.WriteLine("No client certificate.");
            }

            StreamReader reader = new StreamReader(stream);
            StreamWriter writer = new StreamWriter(stream);

            bool clientClose = false;
            while (!System.Console.KeyAvailable)
            {
                System.Console.WriteLine("Waiting for data...");
                string line = reader.ReadLine();
                System.Console.WriteLine("Received: {0}", line);

                if (line == "close")
                {
                    clientClose = true;
                    break;
                }

                writer.WriteLine(line);
                writer.Flush();
            }

            if (!clientClose) System.Console.ReadKey();

            stream.Close();
            server.Stop();
        }

        private static bool VerifyClientCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }
    }
}

无论我尝试什么，服务器总是说“没有客户端证书”。

Answer 1

事实证明， AuthenticateAsServer是这里的关键——更具体地说，是第二个参数。

如果clientCertificateRequired为false ，它将完全忽略客户端证书，即使客户端指定了一个，但如果为true ，它将允许它们，但如果没有指定客户端证书，则不会抛出异常。

愚蠢的我 - 我认为clientCertificateRequired设置为 true 意味着它实际上是必需的，因为 .Net 文档将其描述为：

“一个布尔值，指定客户端是否必须提供认证证书。”* （强调我的）

我的期望是，如果它是true ，并且我没有发送客户端证书，那么它就会失败。 这是 Microsoft 文档不完全准确的一个明显案例。

更新： clientCertificateRequired参数的最新文档包括“注意这只是一个请求——如果没有提供证书，服务器仍然接受连接请求”。

Answer 2

我有同样的问题和我的解决方案：我设置了 clientCertificateRequired true ，并使用下面的代码手动检查 clientCertificate

 state.SslStream = new SslStream(state.NetworkStream, true , new RemoteCertificateValidationCallback(ValidateServerCertificate), null);

 private bool ValidateServerCertificate(object sender, X509Certificate certificate , X509Chain chain, SslPolicyErrors sslPolicyErrors) { if (certificate == null) return false; var clientCertificate = certificate as X509Certificate2; if (!serverCertificate.Thumbprint.Equals(clientCertificate.Thumbprint)) return false; ///For self-signed certificate, return true. return true; //if (sslPolicyErrors == SslPolicyErrors.None) // return true; //Log(string.Format("Certificate validation error:{0}", sslPolicyErrors)); //return false; }