/*
* Copyright (c) 2007, Cameron Rich
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the axTLS project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Demonstrate the use of the axTLS library in C# with a set of
* command-line parameters similar to openssl. In fact, openssl clients
* should be able to communicate with axTLS servers and visa-versa.
*
* This code has various bits enabled depending on the configuration. To enable
* the most interesting version, compile with the 'full mode' enabled.
*
* To see what options you have, run the following:
* > axssl.csharp.exe s_server -?
* > axssl.csharp.exe s_client -?
*
* The axtls shared library must be in the same directory or be found
* by the OS.
*/
using System;
using System.Net;
using System.Net.Sockets;
using axTLS;
public class axssl
{
/*
* Main()
*/
public static void Main(string[] args)
{
if (args.Length == 1 && args[0] == "version")
{
Console.WriteLine("axssl.csharp " + SSLUtil.Version());
Environment.Exit(0);
}
axssl runner = new axssl();
if (args.Length < 1 || (args[0] != "s_server" && args[0] != "s_client"))
runner.print_options(args.Length > 0 ? args[0] : "");
int build_mode = SSLUtil.BuildMode();
if (args[0] == "s_server")
runner.do_server(build_mode, args);
else
runner.do_client(build_mode, args);
}
/*
* do_server()
*/
private void do_server(int build_mode, string[] args)
{
int i = 1;
int port = 4433;
uint options = axtls.SSL_DISPLAY_CERTS;
bool quiet = false;
string password = null;
string private_key_file = null;
/* organise the cert/ca_cert lists */
int cert_size = SSLUtil.MaxCerts();
int ca_cert_size = SSLUtil.MaxCACerts();
string[] cert = new string[cert_size];
string[] ca_cert = new string[ca_cert_size];
int cert_index = 0;
int ca_cert_index = 0;
while (i < args.Length)
{
if (args[i] == "-accept")
{
if (i >= args.Length-1)
{
print_server_options(build_mode, args[i]);
}
port = Int32.Parse(args[++i]);
}
else if (args[i] == "-quiet")
{
quiet = true;
options &= ~(uint)axtls.SSL_DISPLAY_CERTS;
}
else if (build_mode >= axtls.SSL_BUILD_SERVER_ONLY)
{
if (args[i] == "-cert")
{
if (i >= args.Length-1 || cert_index >= cert_size)
{
print_server_options(build_mode, args[i]);
}
cert[cert_index++] = args[++i];
}
else if (args[i] == "-key")
{
if (i >= args.Length-1)
{
print_server_options(build_mode, args[i]);
}
private_key_file = args[++i];
options |= axtls.SSL_NO_DEFAULT_KEY;
}
else if (args[i] == "-pass")
{
if (i >= args.Length-1)
{
print_server_options(build_mode, args[i]);
}
password = args[++i];
}
else if (build_mode >= axtls.SSL_BUILD_ENABLE_VERIFICATION)
{
if (args[i] == "-verify")
{
options |= axtls.SSL_CLIENT_AUTHENTICATION;
}
else if (args[i] == "-CAfile")
{
if (i >= args.Length-1 || ca_cert_index >= ca_cert_size)
{
print_server_options(build_mode, args[i]);
}
ca_cert[ca_cert_index++] = args[++i];
}
else if (build_mode == axtls.SSL_BUILD_FULL_MODE)
{
if (args[i] == "-debug")
{
options |= axtls.SSL_DISPLAY_BYTES;
}
else if (args[i] == "-state")
{
options |= axtls.SSL_DISPLAY_STATES;
}
else if (args[i] == "-show-rsa")
{
options |= axtls.SSL_DISPLAY_RSA;
}
else
print_server_options(build_mode, args[i]);
}
else
print_server_options(build_mode, args[i]);
}
else
print_server_options(build_mode, args[i]);
}
else
print_server_options(build_mode, args[i]);
i++;
}
/* Create socket for incoming connections */
IPEndPoint ep = new IPEndPoint(IPAddress.Any, port);
TcpListener server_sock = new TcpListener(ep);
server_sock.Start();
/**********************************************************************
* This is where the interesting stuff happens. Up until now we've
* just been setting up sockets etc. Now we do the SSL handshake.
**********************************************************************/
SSLServer ssl_ctx = new SSLServer(
options, axtls.SSL_DEFAULT_SVR_SESS);
if (ssl_ctx == null)
{
Console.Error.WriteLine("Error: Server context is invalid");
Environment.Exit(1);
}
if (private_key_file != null)
{
int obj_type = axtls.SSL_OBJ_RSA_KEY;
if (private_key_file.EndsWith(".p8"))
obj_type = axtls.SSL_OBJ_PKCS8;
else if (private_key_file.EndsWith(".p12"))
obj_type = axtls.SSL_OBJ_PKCS12;
if (ssl_ctx.ObjLoad(obj_type,
private_key_file, password) != axtls.SSL_OK)
{
Console.Error.WriteLine("Private key '" + private_key_file +
"' is undefined.");
Environment.Exit(1);
}
}
for (i = 0; i < cert_index; i++)
{
if (ssl_ctx.ObjLoad(axtls.SSL_OBJ_X509_CERT,
cert[i], null) != axtls.SSL_OK)
{
Console.WriteLine("Certificate '" + cert[i] +
"' is undefined.");
Environment.Exit(1);
}
}
for (i = 0; i < ca_cert_index; i++)
{
if (ssl_ctx.ObjLoad(axtls.SSL_OBJ_X509_CACERT,
ca_cert[i], null) != axtls.SSL_OK)
{
Console.WriteLine("Certificate '" + cert[i] +
"' is undefined.");
Environment.Exit(1);
}
}
byte[] buf = null;
int res;
for (;;)
{
if (!quiet)
{
Console.WriteLine("ACCEPT");
}
Socket client_sock = server_sock.AcceptSocket();
SSL ssl = ssl_ctx.Connect(client_sock);
/* do the actual SSL handshake */
while ((res = ssl_ctx.Read(ssl, out buf)) == axtls.SSL_OK)
{
/* check when the connection has been established */
if (ssl.HandshakeStatus() == axtls.SSL_OK)
break;
/* could do something else here */
}
if (res == axtls.SSL_OK) /* connection established and ok */
{
if (!quiet)
{
display_session_id(ssl);
display_cipher(ssl);
}
/* now read (and display) whatever the client sends us */
for (;;)
{
/* keep reading until we get something interesting */
while ((res = ssl_ctx.Read(ssl, out buf)) == axtls.SSL_OK)
{
/* could do something else here */
}
if (res < axtls.SSL_OK)
{
if (!quiet)
{
Console.WriteLine("CONNECTION CLOSED");
}
break;
}
/* convert to string */
char[] str = new char[res];
for (i = 0; i < res; i++)
{
str[i] = (char)buf[i];
}
Console.Write(str);
}
}
else if (!quiet)
{
SSLUtil.DisplayError(res);
}
/* client was disconnected or the handshake failed. */
ssl.Dispose();
client_sock.Close();
}
/* ssl_ctx.Dispose(); */
}
/*
* do_client()
*/
private void do_client(int build_mode, string[] args)
{
if (build_mode < axtls.SSL_BUILD_ENABLE_CLIENT)
{
print_client_options(build_mode, args[1]);
}
int i = 1, res;
int port = 4433;
bool quiet = false;
string password = null;
int reconnect = 0;
string private_key_file = null;
string hostname = "127.0.0.1";
/* organise the cert/ca_cert lists */
int cert_index = 0;
int ca_cert_index = 0;
int cert_size = SSLUtil.MaxCerts();
int ca_cert_size = SSLUtil.MaxCACerts();
string[] cert = new string[cert_size];
string[] ca_cert = new string[ca_cert_size];
uint options = axtls.SSL_SERVER_VERIFY_LATER|axtls.SSL_DISPLAY_CERTS;
byte[] session_id = null;
while (i < args.Length)
{
if (args[i] == "-connect")
{
string host_port;
if (i >= args.Length-1)
{
print_client_options(build_mode, args[i]);
}
host_port = args[++i];
int index_colon;
if ((index_colon = host_port.IndexOf(':')) < 0)
print_client_options(build_mode, args[i]);
hostname = new string(host_port.ToCharArray(),
0, index_colon);
port = Int32.Parse(new String(host_port.ToCharArray(),
index_colon+1, host_port.Length-index_colon-1));
}
else if (args[i] == "-cert")
{
if (i >= args.Length-1 || cert_index >= cert_size)
{
print_client_options(build_mode, args[i]);
}
cert[cert_index++] = args[++i];
}
else if (args[i] == "-key")
{
if (i >= args.Length-1)
{
print_client_options(build_mode, args[i]);
}
private_key_file = args[++i];
options |= axtls.SSL_NO_DEFAULT_KEY;
}
else if (args[i] == "-CAfile")
{
if (i >= args.Length-1 || ca_cert_index >= ca_cert_size)
{
print_client_options(build_mode, args[i]);
}
ca_cert[ca_cert_index++] = args[++i];
}
else if (args[i] == "-verify")
{
options &= ~(uint)axtls.SSL_SERVER_VERIFY_LATER;
}
else if (args[i] == "-reconnect")
{
reconnect = 4;
}
else if (args[i] == "-quiet")
{
quiet = true;
options &= ~(uint)axtls.SSL_DISPLAY_CERTS;
}
else if (args[i] == "-pass")
{
if (i >= args.Length-1)
{
print_client_options(build_mode, args[i]);
}
password = args[++i];
}
else if (build_mode == axtls.SSL_BUILD_FULL_MODE)
{
if (args[i] == "-debug")
{
options |= axtls.SSL_DISPLAY_BYTES;
}
else if (args[i] == "-state")
{
options |= axtls.SSL_DISPLAY_STATES;
}
else if (args[i] == "-show-rsa")
{
options |= axtls.SSL_DISPLAY_RSA;
}
else
print_client_options(build_mode, args[i]);
}
else /* don't know what this is */
print_client_options(build_mode, args[i]);
i++;
}
// IPHostEntry hostInfo = Dns.Resolve(hostname);
IPHostEntry hostInfo = Dns.GetHostEntry(hostname);
IPAddress[] addresses = hostInfo.AddressList;
IPEndPoint ep = new IPEndPoint(addresses[0], port);
Socket client_sock = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
client_sock.Connect(ep);
if (!client_sock.Connected)
{
Console.WriteLine("could not connect");
Environment.Exit(1);
}
if (!quiet)
{
Console.WriteLine("CONNECTED");
}
/**********************************************************************
* This is where the interesting stuff happens. Up until now we've
* just been setting up sockets etc. Now we do the SSL handshake.
**********************************************************************/
SSLClient ssl_ctx = new SSLClient(options,
axtls.SSL_DEFAULT_CLNT_SESS);
if (ssl_ctx == null)
{
Console.Error.WriteLine("Error: Client context is invalid");
Environment.Exit(1);
}
if (private_key_file != null)
{
int obj_type = axtls.SSL_OBJ_RSA_KEY;
if (private_key_file.EndsWith(".p8"))
obj_type = axtls.SSL_OBJ_PKCS8;
else if (private_key_file.EndsWith(".p12"))
obj_type = axtls.SSL_OBJ_PKCS12;
if (ssl_ctx.ObjLoad(obj_type,
private_key_file, password) != axtls.SSL_OK)
{
Console.Error.WriteLine("Private key '" + private_key_file +
"' is undefined.");
Environment.Exit(1);
}
}
for (i = 0; i < cert_index; i++)
{
if (ssl_ctx.ObjLoad(axtls.SSL_OBJ_X509_CERT,
cert[i], null) != axtls.SSL_OK)
{
Console.WriteLine("Certificate '" + cert[i] +
"' is undefined.");
Environment.Exit(1);
}
}
for (i = 0; i < ca_cert_index; i++)
{
if (ssl_ctx.ObjLoad(axtls.SSL_OBJ_X509_CACERT,
ca_cert[i], null) != axtls.SSL_OK)
{
Console.WriteLine("Certificate '" + cert[i] +
"' is undefined.");
Environment.Exit(1);
}
}
SSL ssl = new SSL(new IntPtr(0)); /* keep compiler happy */
/* Try session resumption? */
if (reconnect > 0)
{
while (reconnect-- > 0)
{
ssl = ssl_ctx.Connect(client_sock, session_id);
if ((res = ssl.HandshakeStatus()) != axtls.SSL_OK)
{
if (!quiet)
{
SSLUtil.DisplayError(res);
}
ssl.Dispose();
Environment.Exit(1);
}
display_session_id(ssl);
session_id = ssl.GetSessionId();
if (reconnect > 0)
{
ssl.Dispose();
client_sock.Close();
/* and reconnect */
client_sock = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
client_sock.Connect(ep);
}
}
}
else
{
ssl = ssl_ctx.Connect(client_sock, null);
}
/* check the return status */
if ((res = ssl.HandshakeStatus()) != axtls.SSL_OK)
{
if (!quiet)
{
SSLUtil.DisplayError(res);
}
Environment.Exit(1);
}
if (!quiet)
{
string common_name =
ssl.GetCertificateDN(axtls.SSL_X509_CERT_COMMON_NAME);
if (common_name != null)
{
Console.WriteLine("Common Name:\t\t\t" + common_name);
}
display_session_id(ssl);
display_cipher(ssl);
}
for (;;)
{
string user_input = Console.ReadLine();
if (user_input == null)
break;
byte[] buf = new byte[user_input.Length+2];
buf[buf.Length-2] = (byte)'\n'; /* add the carriage return */
buf[buf.Length-1] = 0; /* null terminate */
for (i = 0; i < buf.Length-2; i++)
{
buf[i] = (byte)user_input[i];
}
if ((res = ssl_ctx.Write(ssl, buf, buf.Length)) < axtls.SSL_OK)
{
if (!quiet)
{
SSLUtil.DisplayError(res);
}
break;
}
}
ssl_ctx.Dispose();
}
/**
* We've had some sort of command-line error. Print out the basic options.
*/
private void print_options(string option)
{
Console.WriteLine("axssl: Error: '" + option +
"' is an invalid command.");
Console.WriteLine("usage: axssl.csharp [s_server|" +
"s_client|version] [args ...]");
Environment.Exit(1);
}
/**
* We've had some sort of command-line error. Print out the server options.
*/
private void print_server_options(int build_mode, string option)
{
int cert_size = SSLUtil.MaxCerts();
int ca_cert_size = SSLUtil.MaxCACerts();
Console.WriteLine("unknown option " + option);
Console.WriteLine("usage: s_server [args ...]");
Console.WriteLine(" -accept arg\t- port to accept on (default " +
"is 4433)");
Console.WriteLine(" -quiet\t\t- No server output");
if (build_mode >= axtls.SSL_BUILD_SERVER_ONLY)
{
Console.WriteLine(" -cert arg\t- certificate file to add (in " +
"addition to default) to chain -");
Console.WriteLine("\t\t Can repeat up to " + cert_size + " times");
Console.WriteLine(" -key arg\t- Private key file to use");
Console.WriteLine(" -pass\t\t- private key file pass phrase source");
}
if (build_mode >= axtls.SSL_BUILD_ENABLE_VERIFICATION)
{
Console.WriteLine(" -verify\t- turn on peer certificate " +
"verification");
Console.WriteLine(" -CAfile arg\t- Certificate authority.");
Console.WriteLine("\t\t Can repeat up to " +
ca_cert_size + "times");
}
if (build_mode == axtls.SSL_BUILD_FULL_MODE)
{
Console.WriteLine(" -debug\t\t- Print more output");
Console.WriteLine(" -state\t\t- Show state messages");
Console.WriteLine(" -show-rsa\t- Show RSA state");
}
Environment.Exit(1);
}
/**
* We've had some sort of command-line error. Print out the client options.
*/
private void print_client_options(int build_mode, string option)
{
int cert_size = SSLUtil.MaxCerts();
int ca_cert_size = SSLUtil.MaxCACerts();
Console.WriteLine("unknown option " + option);
if (build_mode >= axtls.SSL_BUILD_ENABLE_CLIENT)
{
Console.WriteLine("usage: s_client [args ...]");
Console.WriteLine(" -connect host:port - who to connect to " +
"(default is localhost:4433)");
Console.WriteLine(" -verify\t- turn on peer certificate " +
"verification");
Console.WriteLine(" -cert arg\t- certificate file to use");
Console.WriteLine("\t\t Can repeat up to %d times", cert_size);
Console.WriteLine(" -key arg\t- Private key file to use");
Console.WriteLine(" -CAfile arg\t- Certificate authority.");
Console.WriteLine("\t\t Can repeat up to " + ca_cert_size +
" times");
Console.WriteLine(" -quiet\t\t- No client output");
Console.WriteLine(" -pass\t\t- private key file pass " +
"phrase source");
Console.WriteLine(" -reconnect\t- Drop and re-make the " +
"connection with the same Session-ID");
if (build_mode == axtls.SSL_BUILD_FULL_MODE)
{
Console.WriteLine(" -debug\t\t- Print more output");
Console.WriteLine(" -state\t\t- Show state messages");
Console.WriteLine(" -show-rsa\t- Show RSA state");
}
}
else
{
Console.WriteLine("Change configuration to allow this feature");
}
Environment.Exit(1);
}
/**
* Display what cipher we are using
*/
private void display_cipher(SSL ssl)
{
Console.Write("CIPHER is ");
switch (ssl.GetCipherId())
{
case axtls.SSL_AES128_SHA:
Console.WriteLine("AES128-SHA");
break;
case axtls.SSL_AES256_SHA:
Console.WriteLine("AES256-SHA");
break;
case axtls.SSL_RC4_128_SHA:
Console.WriteLine("RC4-SHA");
break;
case axtls.SSL_RC4_128_MD5:
Console.WriteLine("RC4-MD5");
break;
default:
Console.WriteLine("Unknown - " + ssl.GetCipherId());
break;
}
}
/**
* Display what session id we have.
*/
private void display_session_id(SSL ssl)
{
byte[] session_id = ssl.GetSessionId();
if (session_id.Length > 0)
{
Console.WriteLine("-----BEGIN SSL SESSION PARAMETERS-----");
foreach (byte b in session_id)
{
Console.Write("{0:x02}", b);
}
Console.WriteLine("\n-----END SSL SESSION PARAMETERS-----");
}
}
}
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