.Net SslStream 與客戶端證書

Question

我沒有運氣讓客戶端證書與我的 SslStream 項目一起使用。 無論我做什么，我都無法讓它實際使用客戶端證書，盡管事實上所有證書都是有效且受信任的，並且我已經為我自己生成的證書導入了 CA 證書，但它只是沒有工作。 我一定遺漏了一些東西，但我已經經歷了幾十次，查看了文檔、示例和數小時的谷歌搜索，但我就是無法讓它工作。 我究竟做錯了什么？

客戶端：

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;
        }
    }
}

服務器：

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;
        }
    }
}

無論我嘗試什么，服務器總是說“沒有客戶端證書”。

Answer 1

事實證明， AuthenticateAsServer是這里的關鍵——更具體地說，是第二個參數。

如果clientCertificateRequired為false ，它將完全忽略客戶端證書，即使客戶端指定了一個，但如果為true ，它將允許它們，但如果沒有指定客戶端證書，則不會拋出異常。

愚蠢的我 - 我認為clientCertificateRequired設置為 true 意味着它實際上是必需的，因為 .Net 文檔將其描述為：

“一個布爾值，指定客戶端是否必須提供認證證書。”* （強調我的）

我的期望是，如果它是true ，並且我沒有發送客戶端證書，那么它就會失敗。 這是 Microsoft 文檔不完全准確的一個明顯案例。

更新： clientCertificateRequired參數的最新文檔包括“注意這只是一個請求——如果沒有提供證書，服務器仍然接受連接請求”。

Answer 2

我有同樣的問題和我的解決方案：我設置了 clientCertificateRequired true ，並使用下面的代碼手動檢查 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; }