Unicode 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". Unicode C

#include <C_CkSocketW.h>
#include <C_CkCertW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSocketW listenSslSocket;
    HCkCertW cert;
    int myPort;
    int backLog;
    int maxWaitMillisec;
    HCkSocketW clientSock;
    const wchar_t *receivedMsg;

    success = FALSE;

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

    listenSslSocket = CkSocketW_Create();

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

    cert = CkCertW_Create();
    //  The 1st argument is the file path, the 2nd arg is the 
    //  PFX file's password:
    success = CkCertW_LoadPfxFile(cert,L"chilkat.pfx",L"test");
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkSocketW_Dispose(listenSslSocket);
        CkCertW_Dispose(cert);
        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.
    CkSocketW_AddSslAcceptableClientCaDn(listenSslSocket,L"C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root");
    CkSocketW_AddSslAcceptableClientCaDn(listenSslSocket,L"O=Digital Signature Trust Co., CN=DST Root CA X3");

    //  Use the certificate:
    success = CkSocketW_InitSslServer(listenSslSocket,cert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(listenSslSocket));
        CkSocketW_Dispose(listenSslSocket);
        CkCertW_Dispose(cert);
        return;
    }

    //  Bind and listen on a port:
    myPort = 8123;
    //  Allow for a max of 5 queued connect requests.
    backLog = 5;
    success = CkSocketW_BindAndListen(listenSslSocket,myPort,backLog);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(listenSslSocket));
        CkSocketW_Dispose(listenSslSocket);
        CkCertW_Dispose(cert);
        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.
    CkSocketW_putMaxReadIdleMs(listenSslSocket,10000);
    CkSocketW_putMaxSendIdleMs(listenSslSocket,10000);

    //  Accept a single client connection and establish the secure SSL/TLS channel:
    maxWaitMillisec = 20000;
    clientSock = CkSocketW_Create();
    success = CkSocketW_AcceptNext(listenSslSocket,maxWaitMillisec,clientSock);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(listenSslSocket));
        CkSocketW_Dispose(listenSslSocket);
        CkCertW_Dispose(cert);
        CkSocketW_Dispose(clientSock);
        return;
    }

    //  The client (in this example) is going to send a "Hello Server! -EOM-" 
    //  message.  Read it:
    receivedMsg = CkSocketW_receiveUntilMatch(clientSock,L"-EOM-");
    if (CkSocketW_getLastMethodSuccess(clientSock) == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(clientSock));
        CkSocketW_Dispose(listenSslSocket);
        CkCertW_Dispose(cert);
        CkSocketW_Dispose(clientSock);
        return;
    }

    wprintf(L"%s\n",receivedMsg);

    //  Send a "Hello Client! -EOM-" message:
    success = CkSocketW_SendString(clientSock,L"Hello Client! -EOM-");
    if (success == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(clientSock));
        CkSocketW_Dispose(listenSslSocket);
        CkCertW_Dispose(cert);
        CkSocketW_Dispose(clientSock);
        return;
    }

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


    CkSocketW_Dispose(listenSslSocket);
    CkCertW_Dispose(cert);
    CkSocketW_Dispose(clientSock);

    }