C++

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". C++

#include <CkSocket.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkSocket listenSslSocket;

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

    CkCert cert;
    //  The 1st argument is the file path, the 2nd arg is the 
    //  PFX file's password:
    success = cert.LoadPfxFile("chilkat.pfx","test");
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        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:
    success = listenSslSocket.InitSslServer(cert);
    if (success == false) {
        std::cout << listenSslSocket.lastErrorText() << "\r\n";
        return;
    }

    //  Bind and listen on a port:
    int myPort = 8123;
    //  Allow for a max of 5 queued connect requests.
    int backLog = 5;
    success = listenSslSocket.BindAndListen(myPort,backLog);
    if (success == false) {
        std::cout << listenSslSocket.lastErrorText() << "\r\n";
        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.put_MaxReadIdleMs(10000);
    listenSslSocket.put_MaxSendIdleMs(10000);

    //  Accept a single client connection and establish the secure SSL/TLS channel:
    int maxWaitMillisec = 20000;
    CkSocket clientSock;
    success = listenSslSocket.AcceptNext(maxWaitMillisec,clientSock);
    if (success == false) {
        std::cout << listenSslSocket.lastErrorText() << "\r\n";
        return;
    }

    //  The client (in this example) is going to send a "Hello Server! -EOM-" 
    //  message.  Read it:
    const char *receivedMsg = clientSock.receiveUntilMatch("-EOM-");
    if (clientSock.get_LastMethodSuccess() == false) {
        std::cout << clientSock.lastErrorText() << "\r\n";
        return;
    }

    std::cout << receivedMsg << "\r\n";

    //  Send a "Hello Client! -EOM-" message:
    success = clientSock.SendString("Hello Client! -EOM-");
    if (success == false) {
        std::cout << clientSock.lastErrorText() << "\r\n";
        return;
    }

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