Secure FTP with Client Certificate

Chilkat FTP2 provides the ability to use a client certificate with secure FTP (implicit or explicit SSL/TLS). This example demonstrates how to load a certificate from a .pfx and use it as the client-side SSL cert. Note: Client-side certificates are only needed in situations where the server demands one.

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#include <C_CkFtp2.h>
#include <C_CkCertStore.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkFtp2 ftp;
    BOOL success;
    HCkCertStore certStore;
    const char * password;
    HCkCert cert;

    ftp = CkFtp2_Create();

    //  Any string unlocks the component for the 1st 30-days.
    success = CkFtp2_UnlockComponent(ftp,"Anything for 30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        return;
    }

    CkFtp2_putHostname(ftp,"ftp.***.com");
    CkFtp2_putPort(ftp,21);
    CkFtp2_putUsername(ftp,"test");
    CkFtp2_putPassword(ftp,"test");

    //  This example will use explict TLS/SSL.
    //  Establish an explicit secure channel after connection
    //  on the standard FTP port 21.
    CkFtp2_putAuthTls(ftp,TRUE);

    //  The Ssl property is for establishing an implicit SSL connection
    //  on port 990.  Because this example uses explicit SSL, it
    //  should remain FALSE.
    CkFtp2_putSsl(ftp,FALSE);

    //  Load a certificate from a .pfx
    //  A PFX may contain several certs, including the certificates
    //  in a chain of authority.
    certStore = CkCertStore_Create();

    password = "***";
    //  Load the certs from a PFX into an in-memory certificate store:
    success = CkCertStore_LoadPfxFile(certStore,"chilkat.pfx",password);
    if (success != TRUE) {
        printf("%s\n",CkCertStore_lastErrorText(certStore));
        return;
    }

    //  Find the exact cert we'll use:

    cert = CkCertStore_FindCertBySubject(certStore,"Chilkat Software, Inc.");
    if (cert == 0 ) {
        printf("Certificate not found!\n");
        return;
    }

    //  Use this certificate for our secure (SSL/TLS) connection:
    CkFtp2_SetSslClientCert(ftp,cert);
    CkCert_Dispose(cert);

    //  Connect and login to the FTP server.  The connection is
    //  made secure because of the AuthTls setting.
    success = CkFtp2_Connect(ftp);
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        return;
    }
    else {
        //  LastErrorText contains information even when
        //  successful. This allows you to visually verify
        //  that the secure connection actually occurred.
        printf("%s\n",CkFtp2_lastErrorText(ftp));
    }

    printf("Secure FTP Channel Established!\n");

    //  Do whatever you're doing to do ...
    //  upload files, download files, etc...

    //  .....
    //  .....

    CkFtp2_Disconnect(ftp);

    CkFtp2_Dispose(ftp);
    CkCertStore_Dispose(certStore);

    }