/* wolfSSL-TLS-ServerThreaded.cs * * Copyright (C) 2006-2024 wolfSSL Inc. * * This file is part of wolfSSL. * * wolfSSL is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * wolfSSL is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA */ using System; using System.Runtime.InteropServices; using System.Text; using System.IO; using System.Net; using System.Net.Sockets; using System.Threading; using wolfSSL.CSharp; public class wolfSSL_TLS_ServerThread { private IntPtr _ctx; private Socket _fd; public wolfSSL_TLS_ServerThread(IntPtr ctx, Socket fd) { _ctx = ctx; _fd = fd; } private const int kEchoBufSz = 1024; public void start_client() { StringBuilder buff = new StringBuilder(kEchoBufSz); IntPtr ssl = wolfssl.new_ssl(_ctx); if (ssl == IntPtr.Zero) { Console.WriteLine("Error in creating ssl object"); return; } if (wolfssl.set_fd(ssl, _fd) != wolfssl.SUCCESS) { /* get and print out the error */ Console.WriteLine(wolfssl.get_error(ssl)); _fd.Close(); wolfssl.free(ssl); return; } Console.WriteLine("Starting TLS handshake"); if (wolfssl.accept(ssl) != wolfssl.SUCCESS) { /* get and print out the error */ Console.WriteLine("Failed " + wolfssl.get_error(ssl)); _fd.Close(); wolfssl.free(ssl); return; } /* print out results of TLS/SSL accept */ Console.WriteLine("SSL version is " + wolfssl.get_version(ssl)); Console.WriteLine("SSL cipher suite is " + wolfssl.get_current_cipher(ssl)); /* echo data until error */ while (true) { /* read and print out the message then reply */ if (wolfssl.read(ssl, buff, kEchoBufSz-1) < 0) { Console.WriteLine("Error in read"); break; } Console.WriteLine(buff); if (wolfssl.write(ssl, buff, buff.Length) != buff.Length) { Console.WriteLine("Error in write"); break; } } Console.WriteLine("Closing " + wolfssl.get_error(ssl)); _fd.Close(); wolfssl.free(ssl); } } public class wolfSSL_TLS_ServerThreaded { /// /// Example of a logging function /// /// level of log /// message to log public static void standard_log(int lvl, StringBuilder msg) { Console.WriteLine(msg); } public static void Main(string[] args) { IntPtr ctx; /* These paths should be changed for use */ string fileCert = wolfssl.setPath("server-cert.pem"); string fileKey = wolfssl.setPath("server-key.pem"); StringBuilder dhparam = new StringBuilder(wolfssl.setPath("dh2048.pem")); if (fileCert == "" || fileKey == "" || dhparam.Length == 0) { Console.WriteLine("Platform not supported"); return; } /* example of function used for setting logging */ wolfssl.SetLogging(standard_log); wolfssl.Init(); Console.WriteLine("Calling ctx Init from wolfSSL"); ctx = wolfssl.CTX_new(wolfssl.usev23_server()); if (ctx == IntPtr.Zero) { Console.WriteLine("Error in creating ctx structure"); return; } Console.WriteLine("Finished init of ctx .... now load in cert and key"); if (!File.Exists(fileCert) || !File.Exists(fileKey)) { Console.WriteLine("Could not find cert or key file"); wolfssl.CTX_free(ctx); return; } if (!File.Exists(dhparam.ToString())) { Console.WriteLine("Could not find dh file"); wolfssl.CTX_free(ctx); return; } if (wolfssl.CTX_use_certificate_file(ctx, fileCert, wolfssl.SSL_FILETYPE_PEM) != wolfssl.SUCCESS) { Console.WriteLine("Error in setting cert file"); wolfssl.CTX_free(ctx); return; } if (wolfssl.CTX_use_PrivateKey_file(ctx, fileKey, wolfssl.SSL_FILETYPE_PEM) != wolfssl.SUCCESS) { Console.WriteLine("Error in setting key file"); wolfssl.CTX_free(ctx); return; } StringBuilder ciphers = new StringBuilder(new String(' ', 4096)); wolfssl.get_ciphers(ciphers, 4096); Console.WriteLine("Ciphers : " + ciphers.ToString()); short minDhKey = 128; wolfssl.CTX_SetMinDhKey_Sz(ctx, minDhKey); wolfssl.CTX_SetTmpDH_file(ctx, dhparam, wolfssl.SSL_FILETYPE_PEM); /* set up TCP socket */ IPAddress ip = IPAddress.Parse("0.0.0.0"); /* bind to any */ TcpListener tcp = new TcpListener(ip, 11111); tcp.Start(); Console.WriteLine("Started TCP and waiting for a connection"); while (true) { try { Socket fd = tcp.AcceptSocket(); Console.WriteLine("Got client connection"); /* Spin up thread for client */ wolfSSL_TLS_ServerThread thread = new wolfSSL_TLS_ServerThread(ctx, fd); Thread thr = new Thread(new ThreadStart(thread.start_client)); thr.Start(); } catch(Exception ex) { Console.WriteLine("Server Exception " + ex.ToString()); break; } } tcp.Stop(); wolfssl.CTX_free(ctx); wolfssl.Cleanup(); } }