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| #using <System.dll>
#using <System.Security.dll>
#include "pch.h"
using namespace System;
using namespace System::Collections;
using namespace System::Globalization;
using namespace System::Net;
using namespace System::Net::Security;
using namespace System::Net::Sockets;
using namespace System::Security::Authentication;
using namespace System::Text;
using namespace System::Security::Cryptography::X509Certificates;
using namespace System::IO;
namespace NlsClientSync
{
public ref class SslTcpClient
{
private:
static Hashtable^ certificateErrors = gcnew Hashtable;
// Load a table of errors that might cause
// the certificate authentication to fail.
static void InitializeCertificateErrors()
{
certificateErrors->Add(0x800B0101,
"The certification has expired.");
certificateErrors->Add(0x800B0104,
"A path length constraint "
"in the certification chain has been violated.");
certificateErrors->Add(0x800B0105,
"A certificate contains an unknown extension "
"that is marked critical.");
certificateErrors->Add(0x800B0107,
"A parent of a given certificate in fact "
"did not issue that child certificate.");
certificateErrors->Add(0x800B0108,
"A certificate is missing or has an empty value "
"for a necessary field.");
certificateErrors->Add(0x800B0109,
"The certificate root is not trusted.");
certificateErrors->Add(0x800B010C,
"The certificate has been revoked.");
certificateErrors->Add(0x800B010F,
"The name in the certificate does not not match "
"the host name requested by the client.");
certificateErrors->Add(0x800B0111,
"The certificate was explicitly marked "
"as untrusted by the user.");
certificateErrors->Add(0x800B0112,
"A certification chain processed correctly, "
"but one of the CA certificates is not trusted.");
certificateErrors->Add(0x800B0113,
"The certificate has an invalid policy.");
certificateErrors->Add(0x800B0114,
"The certificate name is either not "
"in the permitted list or is explicitly excluded.");
certificateErrors->Add(0x80092012,
"The revocation function was unable to check "
"revocation for the certificate.");
certificateErrors->Add(0x80090327,
"An unknown error occurred while "
"processing the certificate.");
certificateErrors->Add(0x80096001,
"A system-level error occurred "
"while verifying trust.");
certificateErrors->Add(0x80096002,
"The certificate for the signer of the message "
"is invalid or not found.");
certificateErrors->Add(0x80096003,
"One of the counter signatures was invalid.");
certificateErrors->Add(0x80096004,
"The signature of the certificate "
"cannot be verified.");
certificateErrors->Add(0x80096005,
"The time stamp signature or certificate "
"could not be verified or is malformed.");
certificateErrors->Add(0x80096010,
"The digital signature of the object "
"was not verified.");
certificateErrors->Add(0x80096019,
"The basic constraint extension of a certificate "
"has not been observed.");
}
static String^ CertificateErrorDescription(UInt32 problem)
{
// Initialize the error message dictionary
// if it is not yet available.
if (certificateErrors->Count == 0)
{
InitializeCertificateErrors();
}
String^ description = safe_cast<String^>(
certificateErrors[problem]);
if (description == nullptr)
{
description = String::Format(
CultureInfo::CurrentCulture,
"Unknown certificate error - 0x{0:x8}",
problem);
}
return description;
}
public:
// The following method is invoked
// by the CertificateValidationDelegate.
static bool ValidateServerCertificate(
Object^ sender,
X509Certificate^ certificate,
X509Chain^ chain,
SslPolicyErrors sslPolicyErrors)
{
Console::WriteLine("Validating the server certificate.");
if (sslPolicyErrors == SslPolicyErrors::None)
return true;
Console::WriteLine("Certificate error: {0}", sslPolicyErrors);
// Do not allow this client to communicate with unauthenticated servers.
return false;
}
static void RunClient(String^ machineName, String^ serverName)
{
// Create a TCP/IP client socket.
// machineName is the host running the server application.
TcpClient^ client = gcnew TcpClient(machineName, 8080);
Console::WriteLine("Client connected.");
// Create an SSL stream that will close
// the client's stream.
SslStream^ sslStream = gcnew SslStream(
client->GetStream(), false,
gcnew RemoteCertificateValidationCallback(ValidateServerCertificate),
nullptr);
// The server name must match the name
// on the server certificate.
try
{
sslStream->AuthenticateAsClient(serverName);
}
catch (AuthenticationException^ ex)
{
Console::WriteLine("Exception: {0}", ex->Message);
if (ex->InnerException != nullptr)
{
Console::WriteLine("Inner exception: {0}",
ex->InnerException->Message);
}
Console::WriteLine("Authentication failed - "
"closing the connection.");
sslStream->Close();
client->Close();
return;
}
// Encode a test message into a byte array.
// Signal the end of the message using the "<EOF>".
array<Byte>^ messsage = Encoding::UTF8->GetBytes(
"Hello from the client.<EOF>");
// Send hello message to the server.
sslStream->Write(messsage);
sslStream->Flush();
// Read message from the server.
String^ serverMessage = ReadMessage(sslStream);
Console::WriteLine("Server says: {0}", serverMessage);
// Close the client connection.
sslStream->Close();
client->Close();
Console::WriteLine("Client closed.");
}
private:
static String^ ReadMessage(SslStream^ sslStream)
{
// Read the message sent by the server.
// The end of the message is signaled using the
// "<EOF>" marker.
array<Byte>^ buffer = gcnew array<Byte>(2048);
StringBuilder^ messageData = gcnew StringBuilder;
// Use Decoder class to convert from bytes to UTF8
// in case a character spans two buffers.
Encoding^ u8 = Encoding::UTF8;
Decoder^ decoder = u8->GetDecoder();
int bytes = -1;
do
{
bytes = sslStream->Read(buffer, 0, buffer->Length);
array<__wchar_t>^ chars = gcnew array<__wchar_t>(
decoder->GetCharCount(buffer, 0, bytes));
decoder->GetChars(buffer, 0, bytes, chars, 0);
messageData->Append(chars);
// Check for EOF.
if (messageData->ToString()->IndexOf("<EOF>") != -1)
{
break;
}
} while (bytes != 0);
return messageData->ToString();
}
};
}
int main()
{
array<String^>^ args = Environment::GetCommandLineArgs();
String^ serverCertificateName = nullptr;
String^ machineName = nullptr;
/*if (args == nullptr || args->Length < 2)
{
Console::WriteLine("To start the client specify:");
Console::WriteLine("clientSync machineName [serverName]");
return 1;
}
// User can specify the machine name and server name.
// Server name must match the name on
// the server's certificate.
machineName = args[1];
if (args->Length < 3)
{
serverCertificateName = machineName;
}
else
{
serverCertificateName = args[2];
};*/
NlsClientSync::SslTcpClient::RunClient("localhost","test.pvk");
return 0;
} |
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