(C) Using WS_FTP Self-signed Certificate file (.crt) and Private Key File. (.key)

Demonstrates how to use a self-signed certificate created by WS_FTP with Chilkat FTP2.

Note: It is usually not necessary for the FTP client to use a client-side certificate. Most FTP servers using SSL and TLS connections (explicit or implicit) do not require client-side certs. In addition, some high-security FTP servers require "real" certificates -- meaning certificates issued by a real certificate authority with a chain of authentication that leads to a trusted root certificate. The certificates created by WS_FTP are self-signed and untrusted.

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

void ChilkatSample(void)
    {
    HCkFtp2 ftp;
    HCkCertStore certStore;
    BOOL success;
    HCkCert cert;

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

    // Important:  Before running this program, convert your
    // .crt and .key files to a .p12 using OpenSSL:
    // The command is this:
    // openssl pkcs12 -export -in test.crt -inkey test.key -out test.p12
    // 

    ftp = CkFtp2_Create();

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

    // 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);

    // Create an instance of a certificate store object, load a .p12 file,
    // locate the certificate we need, and use it for signing.
    // (a P12/PFX file may contain more than one certificate.)
    certStore = CkCertStore_Create();
    // The 1st argument is the filename, the 2nd arg is the 
    // .p12 file's password.  (OpenSSL will prompty you to set a password
    // when converting the .crt and .key into a .p12).
    success = CkCertStore_LoadPfxFile(certStore,"test.p12","secret");
    if (success != TRUE) {
        printf("%s\n",CkCertStore_lastErrorText(certStore));
        CkFtp2_Dispose(ftp);
        CkCertStore_Dispose(certStore);
        return;
    }

    cert = CkCertStore_FindCertBySubjectCN(certStore,"Your cert's common name");
    if (CkCertStore_getLastMethodSuccess(certStore) == FALSE) {
        printf("%s\n",CkCertStore_lastErrorText(certStore));
        CkFtp2_Dispose(ftp);
        CkCertStore_Dispose(certStore);
        return;
    }

    success = CkFtp2_SetSslClientCert(ftp,cert);

    CkCert_Dispose(cert);

    // Connect and login to the FTP server.
    success = CkFtp2_Connect(ftp);
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        CkCertStore_Dispose(certStore);
        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");
    printf("%s\n",CkFtp2_lastErrorText(ftp));

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

    // ...
    // ...

    success = CkFtp2_Disconnect(ftp);


    CkFtp2_Dispose(ftp);
    CkCertStore_Dispose(certStore);

    }