(C) SFTP Authentication using X.509 Certificates

See more SFTP Examples

Demonstrates how to authenticate with an SSH/SFTP server using an certificate's private key.

Note: See X.509v3 Certificates for SSH Authentication for more information.

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#include <C_CkSFtp.h>
#include <C_CkCert.h>
#include <C_CkSshKey.h>

void ChilkatSample(void)
    {
    HCkSFtp sftp;
    const char *hostname;
    int port;
    BOOL success;
    HCkCert cert;
    const char *privKeyPem;
    HCkSshKey key;

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

    sftp = CkSFtp_Create();

    hostname = "sftp.example.com";
    port = 22;
    success = CkSFtp_Connect(sftp,hostname,port);
    if (success != TRUE) {
        printf("%s\n",CkSFtp_lastErrorText(sftp));
        CkSFtp_Dispose(sftp);
        return;
    }

    // Load the cert + private key from a .pfx.
    // Note: Chilkat provides methods for loading certs and private keys from many sources, including smart cards and USB tokens (HSM's)
    cert = CkCert_Create();
    success = CkCert_LoadPfxFile(cert,"qa_data/pfx/example.pfx","pfx_password");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkSFtp_Dispose(sftp);
        CkCert_Dispose(cert);
        return;
    }

    // Get the cert's private key (as PEM) to be used for SSH authentication.
    // (The public key is installed on the server.)
    privKeyPem = CkCert_getPrivateKeyPem(cert);
    if (CkCert_getLastMethodSuccess(cert) == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkSFtp_Dispose(sftp);
        CkCert_Dispose(cert);
        return;
    }

    key = CkSshKey_Create();

    // Load a private key from a PEM string:
    success = CkSshKey_FromOpenSshPrivateKey(key,privKeyPem);
    if (success != TRUE) {
        printf("%s\n",CkSshKey_lastErrorText(key));
        CkSFtp_Dispose(sftp);
        CkCert_Dispose(cert);
        CkSshKey_Dispose(key);
        return;
    }

    // Authenticate with the SSH server.
    success = CkSFtp_AuthenticatePk(sftp,"myLogin",key);
    if (success != TRUE) {
        printf("%s\n",CkSFtp_lastErrorText(sftp));
        CkSFtp_Dispose(sftp);
        CkCert_Dispose(cert);
        CkSshKey_Dispose(key);
        return;
    }

    printf("Public-Key Authentication Successful!\n");


    CkSFtp_Dispose(sftp);
    CkCert_Dispose(cert);
    CkSshKey_Dispose(key);

    }