Dart Requires Chilkat v11.0.0+

Accept TLS Connection with Client Authentication

See more Socket/SSL/TLS Examples

Demonstrates how to accept a TLS connection requiring client authentication. This is the case where the TLS client sends a certificate. It is also known as "Two-Way SSL". Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final listenSslSocket = CkSocket();

  // An SSL/TLS server needs a digital certificate.  This example loads it from a PFX file.
  // Note: This is the server's certificate.

  final cert = CkCert();
  // The 1st argument is the file path, the 2nd arg is the 
  // PFX file's password:
  try {
    cert.loadPfxFile('chilkat.pfx', 'test');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // To accept client client certificates in the TLS handshake,
  // we must indicate a list of acceptable client certificate root CA DN's
  // that are allowed.  (DN is an acronym for Distinguished Name.)
  // Call AddSslAcceptableClientCaDn once for each acceptable CA DN.
  // Here are a few examples so you can see the general format of a DN.
  listenSslSocket.addSslAcceptableClientCaDn('C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root');
  listenSslSocket.addSslAcceptableClientCaDn('O=Digital Signature Trust Co., CN=DST Root CA X3');

  // Use the certificate:
  try {
    listenSslSocket.initSslServer(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Bind and listen on a port:
  final myPort = 8123;
  // Allow for a max of 5 queued connect requests.
  final backLog = 5;
  try {
    listenSslSocket.bindAndListen(myPort, backLog);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // If accepting an SSL/TLS connection, the SSL handshake is part of the connection
  // establishment process. This involves a few back-and-forth messages between the 
  // client and server to establish algorithms and a shared key to create the secure 
  // channel. The sending and receiving of these messages are governed by the 
  // MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
  // (and this is the default unless changed by your application), then the 
  // AcceptNext can hang indefinitely during the SSL handshake process. 
  // Make sure these properties are set to appropriate values before calling AcceptNext.

  // Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
  listenSslSocket.maxReadIdleMs = 10000;
  listenSslSocket.maxSendIdleMs = 10000;

  // Accept a single client connection and establish the secure SSL/TLS channel:
  final maxWaitMillisec = 20000;
  final clientSock = CkSocket();
  try {
    listenSslSocket.acceptNext(maxWaitMillisec, clientSock);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The client (in this example) is going to send a "Hello Server! -EOM-" 
  // message.  Read it:
  final String receivedMsg;
  try {
    receivedMsg = clientSock.receiveUntilMatch('-EOM-');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(receivedMsg);

  // Send a "Hello Client! -EOM-" message:
  try {
    clientSock.sendString('Hello Client! -EOM-');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Close the connection with the client
  // Wait a max of 20 seconds (20000 millsec)
  clientSock.close(20000);
}