带有客户端证书的 .Net SslStream

Question

我的 SslStream 项目无法获得客户端证书。无论我做什么，我都无法让它真正使用客户端证书，尽管所有证书都是有效且可信的，而且我已经为我自己生成的证书导入了 CA 证书，但它并没有工作。我一定是遗漏了一些东西，但我已经检查了数十次，查看了文档、示例，并进行了 google 数小时的搜索，但我就是无法让它工作。我做错了什么？

客户：

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 "No client certificate."

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是false，它会完全忽略客户端证书，即使是客户端指定的，但是如果是true，它会允许它们，但是如果未指定客户端证书，则不会抛出异常。

愚蠢的我 - 我认为 clientCertificateRequired 设置为 true 意味着它将 实际需要 ，因为 .Net 文档将其描述为：

"A Boolean value that specifies whether the client must supply a certificate for authentication."* (emphasis mine)

我的预期是，如果它是 true，并且我没有发送客户端证书，那么它将失败。这是 Microsoft 文档不够准确的明显案例。

更新：clientCertificateRequired 参数的 latest documentation 包含短语 "Note that this is only a request -- if no certificate is provided, the server still accepts the connection request."

带有客户端证书的 .Net SslStream

.Net SslStream with Client Certificate

.net

c#

sockets

ssl

client-certificates