SSL POP3 with Certificates

Demonstrates how to use a client-side certificate with an SSL connection to a POP3 server. Also demonstrates how to get the POP3 server's SSL certificate.

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#include <CkMailMan.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    //  The mailman object is used for receiving (POP3)
    //  and sending (SMTP) email.
    CkMailMan mailman;

    //  Any string argument automatically begins the 30-day trial.
    bool success;
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        printf("Component unlock failed\n");
        return;
    }

    //  Set the GMail account POP3 properties.
    mailman.put_MailHost("pop.gmail.com");
    mailman.put_PopUsername("chilkat.support");
    mailman.put_PopPassword("****");
    mailman.put_PopSsl(true);
    mailman.put_MailPort(995);

    //  Use our certificate, which is already installed
    //  in our current-user certificate store on the computer.
    CkCert clientCert;
    success = clientCert.LoadByCommonName("Chilkat Software, Inc.");
    if (success != true) {
        printf("%s\n",clientCert.lastErrorText());
        return;
    }

    //  Note: The GMail POP3 server does not require that you
    //  have a client cert.  This example only demonstrates
    //  how you may use a client certificate.  Typically,
    //  higher-security systems may require a client-side SSL cert.
    mailman.SetSslClientCert(clientCert);

    //  Establish a POP3 connection:
    success = mailman.Pop3BeginSession();
    if (success != true) {
        printf("%s\n",mailman.lastErrorText());
        return;
    }

    //  Let's look at the LastErrorText to see the details
    //  of the successful connection.  We should see our cert:
    printf("%s\n",mailman.lastErrorText());

    //  OK, now examine the server's cert:
    CkCert *serverCert = 0;
    serverCert = mailman.GetPop3SslServerCert();
    if (serverCert == 0 ) {
        printf("No server cert available.\n");
    }
    else {
        printf("Server SSL certificate:\n");
        printf("%s\n",serverCert->subjectDN());

        //  Was the server certificate verified?
        //  It's not necessarily an error if the SSL Server cert is not verified.
        if (mailman.get_Pop3SslServerCertVerified() == true) {
            printf("Server SSL certificate was verified.\n");
        }
        else {
            printf("Server SSL certificate was NOT verified!\n");
        }

    }


    }