OVMS3/OVMS.V3/components/wolfssl/wrapper/CSharp/wolfSSL-Example-IOCallbacks/wolfSSL-Example-IOCallbacks.cs

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/* wolfSSL-Example-IOCallbacks.cs
*
* Copyright (C) 2006-2020 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.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.IO;
using wolfSSL.CSharp;
class wolfSSL_Example_IOCallbacks
{
/// <summary>
/// Example call back to allow receiving TLS information
/// </summary>
/// <param name="ssl">structure of ssl passed in</param>
/// <param name="buf">buffer to contain received msg</param>
/// <param name="sz">size of buffer for receiving</param>
/// <param name="ctx">information passed in from set_fd</param>
/// <returns>size of message received</returns>
private static int wolfSSLCbIORecv(IntPtr ssl, IntPtr buf, int sz, IntPtr ctx)
{
if (sz <= 0)
{
wolfssl.log(wolfssl.ERROR_LOG, "wolfssl receive error, size less than 0");
return wolfssl.CBIO_ERR_GENERAL;
}
int amtRecv = 0;
try
{
System.Runtime.InteropServices.GCHandle gch;
gch = GCHandle.FromIntPtr(ctx);
Socket con = (System.Net.Sockets.Socket)gch.Target;
Byte[] msg = new Byte[sz];
amtRecv = con.Receive(msg, msg.Length, 0);
Marshal.Copy(msg, 0, buf, sz);
}
catch (Exception e)
{
wolfssl.log(wolfssl.ENTER_LOG, "Error in receive " + e.ToString());
return wolfssl.CBIO_ERR_CONN_CLOSE;
}
Console.WriteLine("Example custom receive got {0:D} bytes", amtRecv);
return amtRecv;
}
/// <summary>
/// Example call back used for sending TLS information
/// </summary>
/// <param name="ssl">pointer to ssl struct</param>
/// <param name="buf">buffer containing information to send</param>
/// <param name="sz">size of buffer to send</param>
/// <param name="ctx">object that was set as fd</param>
/// <returns>amount of information sent</returns>
private static int wolfSSLCbIOSend(IntPtr ssl, IntPtr buf, int sz, IntPtr ctx)
{
if (sz <= 0)
{
wolfssl.log(wolfssl.ERROR_LOG, "wolfssl send error, size less than 0");
return wolfssl.CBIO_ERR_GENERAL;
}
try
{
System.Runtime.InteropServices.GCHandle gch;
gch = GCHandle.FromIntPtr(ctx);
Socket con = (System.Net.Sockets.Socket)gch.Target;
Byte[] msg = new Byte[sz];
Marshal.Copy(buf, msg, 0, sz);
con.Send(msg, 0, msg.Length, SocketFlags.None);
Console.WriteLine("Example custom send sent {0:D} bytes", sz);
return sz;
}
catch (Exception e)
{
wolfssl.log(wolfssl.ERROR_LOG, "socket connection issue " + e.ToString());
return wolfssl.CBIO_ERR_CONN_CLOSE;
}
}
/// <summary>
/// Example of a PSK function call back
/// </summary>
/// <param name="ssl">pointer to ssl structure</param>
/// <param name="identity">identity of client connecting</param>
/// <param name="key">buffer to hold key</param>
/// <param name="max_key">max key size</param>
/// <returns>size of key set</returns>
public static uint my_psk_server_cb(IntPtr ssl, string identity, IntPtr key, uint max_key)
{
/* perform a check on the identity sent across
* log function must be set for print out of logging information
*/
wolfssl.log(wolfssl.INFO_LOG, "PSK Client Identity = " + identity);
/* Use desired key, note must be a key smaller than max key size parameter
Replace this with desired key. Is trivial one for testing */
if (max_key < 4)
return 0;
byte[] tmp = { 26, 43, 60, 77 };
Marshal.Copy(tmp, 0, key, 4);
return (uint)4;
}
/// <summary>
/// Example of a certificate verify function
/// </summary>
/// <param name="preverify"></param>
/// <param name="store">pointer to a WOLFSSL_X509_STORE_CTX</param>
/// <returns>size of key set</returns>
public static int my_verify_cb(int preverify, IntPtr store)
{
if (store == IntPtr.Zero)
{
Console.WriteLine("store is null");
}
Console.WriteLine("Status of certificate verify = " + preverify);
Console.WriteLine("Error value for cert store is " + wolfssl.X509_STORE_CTX_get_error(store));
/* look at the current cert in store */
try
{
X509 x509 = wolfssl.X509_STORE_CTX_get_current_cert(store);
Console.WriteLine("Issuer : " + x509.Issuer);
Console.WriteLine("Subject : " + x509.Subject);
Console.WriteLine("PEM of certificate:");
Console.WriteLine(System.Text.Encoding.UTF8.GetString(x509.Export()));
Console.WriteLine("DER of certificate:");
Console.WriteLine(BitConverter.ToString(x509.Export(wolfssl.SSL_FILETYPE_ASN1)));
Console.WriteLine("Public key:");
Console.WriteLine(BitConverter.ToString(x509.GetPublicKey()));
}
catch (Exception e)
{
Console.WriteLine("Unable to get X509's" + e);
}
/* list all certs in store */
try
{
int i;
X509[] x509 = wolfssl.X509_STORE_CTX_get_certs(store);
for (i = 0; i < x509.Length; i++)
{
Console.WriteLine("CERT[" + i + "]");
Console.WriteLine("Issuer : " + x509[i].Issuer);
Console.WriteLine("Subject : " + x509[i].Subject);
Console.WriteLine("");
}
}
catch (Exception e)
{
Console.WriteLine("Unable to get X509's" + e);
}
/* by returning 1 here we override any failure and report success */
return preverify;
}
private static void clean(IntPtr ssl, IntPtr ctx)
{
wolfssl.free(ssl);
wolfssl.CTX_free(ctx);
wolfssl.Cleanup();
}
static void Main(string[] args)
{
IntPtr ctx;
IntPtr ssl;
Socket fd;
wolfssl.psk_delegate psk_cb = new wolfssl.psk_delegate(my_psk_server_cb);
wolfssl.CallbackVerify_delegate verify_cb = new wolfssl.CallbackVerify_delegate(my_verify_cb);
/* These paths should be changed according to use */
string fileCert = @"server-cert.pem";
string fileKey = @"server-key.pem";
StringBuilder buff = new StringBuilder(1024);
StringBuilder reply = new StringBuilder("Hello, this is the wolfSSL C# wrapper");
wolfssl.Init();
Console.WriteLine("Calling ctx Init from wolfSSL");
ctx = wolfssl.CTX_new(wolfssl.useTLSv1_2_server());
if (ctx == IntPtr.Zero)
{
Console.WriteLine("Error 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 (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;
}
wolfssl.CTX_set_verify(ctx, wolfssl.SSL_VERIFY_PEER, verify_cb);
/* Set using custom IO callbacks
delegate memory is allocated when calling SetIO**** function and freed with ctx free
*/
wolfssl.SetIORecv(ctx, new wolfssl.CallbackIORecv_delegate(wolfSSLCbIORecv));
wolfssl.SetIOSend(ctx, new wolfssl.CallbackIOSend_delegate(wolfSSLCbIOSend));
/* 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);
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.accept(ssl) != wolfssl.SUCCESS)
{
/* get and print out the error */
Console.WriteLine(wolfssl.get_error(ssl));
tcp.Stop();
clean(ssl, ctx);
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));
/* 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);
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);
}
}