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wolfssl/wrapper/CSharp/wolfSSL-TLS-Server/wolfSSL-TLS-Server.cs

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/* wolfSSL-TLS-Server.cs
*
* Copyright (C) 2006-2025 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 wolfSSL.CSharp;
public class wolfSSL_TLS_CSHarp
{
/// <summary>
/// Example of a logging function
/// </summary>
/// <param name="lvl">level of log</param>
/// <param name="msg">message to log</param>
public static void standard_log(int lvl, StringBuilder msg)
{
Console.WriteLine(msg);
}
private static void clean(IntPtr ssl, IntPtr ctx)
{
wolfssl.free(ssl);
wolfssl.CTX_free(ctx);
wolfssl.Cleanup();
}
/// <summary>
/// Checks if the SNI option was enabled via command line.
/// Must be enabled with ./configure --enable-sni when configuring
/// wolfSSL.
/// <param name="args">Parameters passed via command line</param>
/// </summary>
private static bool haveSNI(string[] args)
{
bool sniON = false;
for (int i = 0; i < args.Length; i++) {
if (args[i] == "-S") {
sniON = true;
break;
}
}
Console.WriteLine("SNI IS: " + sniON);
return sniON;
}
/// <summary>
/// Example of a SNI function call back
/// </summary>
/// <param name="ssl">pointer to ssl structure</param>
/// <param name="ret">alert code</param>
/// <param name="exArg">context arg, can be set with the function wolfssl.CTX_set_servername_arg</param>
/// <returns></returns>
public static int my_sni_server_cb(IntPtr ssl, IntPtr ret, IntPtr exArg) {
/* Trivial callback just for testing */
Console.WriteLine("my sni server callback");
return 0;
}
public static void Main(string[] args)
{
IntPtr ctx;
IntPtr ssl;
Socket fd;
IntPtr arg_sni;
/* 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;
}
StringBuilder buff = new StringBuilder(1024);
StringBuilder reply = new StringBuilder("Hello, this is the wolfSSL C# wrapper");
//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);
/* 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");
fd = tcp.AcceptSocket();
ssl = wolfssl.new_ssl(ctx);
if (ssl == IntPtr.Zero)
{
Console.WriteLine("Error in creating ssl object");
wolfssl.CTX_free(ctx);
return;
}
if (haveSNI(args))
{
// Allocating memory and setting SNI arg
int test_value = 32;
arg_sni = Marshal.AllocHGlobal(sizeof(int));
Marshal.WriteInt32(arg_sni, test_value);
if (wolfssl.CTX_set_servername_arg(ctx, arg_sni) == wolfssl.FAILURE) {
Console.WriteLine("wolfssl.CTX_set_servername_arg failed");
wolfssl.CTX_free(ctx);
return;
}
// Setting SNI delegate
wolfssl.sni_delegate sni_cb = new wolfssl.sni_delegate(my_sni_server_cb);
wolfssl.CTX_set_servername_callback(ctx, sni_cb);
}
Console.WriteLine("Connection made wolfSSL_accept ");
if (wolfssl.set_fd(ssl, fd) != wolfssl.SUCCESS)
{
/* get and print out the error */
Console.WriteLine(wolfssl.get_error(ssl));
tcp.Stop();
clean(ssl, ctx);
return;
}
if (wolfssl.SetTmpDH_file(ssl, dhparam, wolfssl.SSL_FILETYPE_PEM) != wolfssl.SUCCESS)
{
Console.WriteLine("Error in setting dh2048Pem");
Console.WriteLine(wolfssl.get_error(ssl));
tcp.Stop();
clean(ssl, ctx);
return;
}
if (wolfssl.accept(ssl) != wolfssl.SUCCESS)
{
/* get and print out the error */
Console.WriteLine(wolfssl.get_error(ssl));
tcp.Stop();
clean(ssl, ctx);
return;
}
/* get and print sni used by the client */
if (haveSNI(args)) {
IntPtr data = IntPtr.Zero;
ushort size = wolfssl.SNI_GetRequest(ssl, 0, ref data);
string dataStr = Marshal.PtrToStringAnsi(data);
Console.WriteLine("(SNI_GetRequest) Size of SNI used by client: " + size);
Console.WriteLine("(SNI_GetRequest) SNI used by client: " + dataStr);
}
/* 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));
/* read and print out the message then reply */
if (wolfssl.read(ssl, buff, 1023) < 0)
{
Console.WriteLine("Error in read");
tcp.Stop();
clean(ssl, ctx);
return;
}
Console.WriteLine(buff);
/* get and print sni from a sample buffer, can be used by using the raw client hello */
if (haveSNI(args)) {
IntPtr result = Marshal.AllocHGlobal(32);
IntPtr inOutSz = Marshal.AllocHGlobal(sizeof(int));
Marshal.WriteInt32(inOutSz, 32);
byte []buffer = { /* from TextMate website client hello example */
0x16, 0x03, 0x01, 0x00, 0xc6, 0x01, 0x00, 0x00, 0xc2, 0x03, 0x03, 0x52,
0x8b, 0x7b, 0xca, 0x69, 0xec, 0x97, 0xd5, 0x08, 0x03, 0x50, 0xfe, 0x3b,
0x99, 0xc3, 0x20, 0xce, 0xa5, 0xf6, 0x99, 0xa5, 0x71, 0xf9, 0x57, 0x7f,
0x04, 0x38, 0xf6, 0x11, 0x0b, 0xb8, 0xd3, 0x00, 0x00, 0x5e, 0x00, 0xff,
0xc0, 0x24, 0xc0, 0x23, 0xc0, 0x0a, 0xc0, 0x09, 0xc0, 0x07, 0xc0, 0x08,
0xc0, 0x28, 0xc0, 0x27, 0xc0, 0x14, 0xc0, 0x13, 0xc0, 0x11, 0xc0, 0x12,
0xc0, 0x26, 0xc0, 0x25, 0xc0, 0x2a, 0xc0, 0x29, 0xc0, 0x05, 0xc0, 0x04,
0xc0, 0x02, 0xc0, 0x03, 0xc0, 0x0f, 0xc0, 0x0e, 0xc0, 0x0c, 0xc0, 0x0d,
0x00, 0x3d, 0x00, 0x3c, 0x00, 0x2f, 0x00, 0x05, 0x00, 0x04, 0x00, 0x35,
0x00, 0x0a, 0x00, 0x67, 0x00, 0x6b, 0x00, 0x33, 0x00, 0x39, 0x00, 0x16,
0x00, 0xaf, 0x00, 0xae, 0x00, 0x8d, 0x00, 0x8c, 0x00, 0x8a, 0x00, 0x8b,
0x00, 0xb1, 0x00, 0xb0, 0x00, 0x2c, 0x00, 0x3b, 0x01, 0x00, 0x00, 0x3b,
0x00, 0x00, 0x00, 0x15, 0x00, 0x13, 0x00, 0x00, 0x10, 0x61, 0x70, 0x69,
0x2e, 0x74, 0x65, 0x78, 0x74, 0x6d, 0x61, 0x74, 0x65, 0x2e, 0x6f, 0x72,
0x67, 0x00, 0x0a, 0x00, 0x08, 0x00, 0x06, 0x00, 0x17, 0x00, 0x18, 0x00,
0x19, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00, 0x00, 0x0d, 0x00, 0x0c, 0x00,
0x0a, 0x05, 0x01, 0x04, 0x01, 0x02, 0x01, 0x04, 0x03, 0x02, 0x03
};
int ret = wolfssl.SNI_GetFromBuffer(buffer, 1024, 0, result, inOutSz);
if (ret != wolfssl.SUCCESS) {
Console.WriteLine("Error on reading SNI from buffer, ret value = " + ret);
tcp.Stop();
clean(ssl, ctx);
return;
}
string resultStr = Marshal.PtrToStringAnsi(result);
Console.WriteLine("(SNI_GetFromBuffer) SNI used by client: " + resultStr);
}
if (wolfssl.write(ssl, reply, reply.Length) != reply.Length)
{
Console.WriteLine("Error in write");
tcp.Stop();
clean(ssl, ctx);
return;
}
wolfssl.shutdown(ssl);
fd.Close();
tcp.Stop();
clean(ssl, ctx);
}
}
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