Node.js

Verify and Pin the FTPS Server Certificate

Demonstrates the certificate-verification properties RequireSslCertVerify, TlsPinSet, and the read-only SslServerCertVerified.

Background: By default a TLS connection is not rejected merely because certificate-chain verification fails, so RequireSslCertVerify = true is the important hardening step — it makes an expired, unsigned, or untrusted certificate abort the connection. TlsPinSet adds public-key pinning on top: the handshake fails unless the server's SPKI fingerprint matches one you configured, defending against a mis-issued certificate that would otherwise validate. Pinning supplements verification rather than replacing it. SslServerCertVerified reports the outcome.

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Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var ftp = new chilkat.Ftp2();

    ftp.Hostname = "ftp.example.com";
    ftp.Username = "myFtpLogin";

    ftp.AuthTls = true;

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    ftp.Password = "myPassword";

    //  Reject the connection if the server certificate cannot be verified (expired, bad signature,
    //  untrusted chain, etc.).  The default is false, which does not reject on verification
    //  failure -- set true for security.
    ftp.RequireSslCertVerify = true;

    //  Optionally pin the server's public key.  If none of the configured SPKI fingerprints matches,
    //  the TLS handshake fails.  Pinning supplements normal verification; it does not replace it.
    ftp.TlsPinSet = "sha256//YLh1dUR9y6Kja30RrAn7JKnbQG/uEtLMkBgFF2Fuihg=";

    success = ftp.Connect();
    if (success == false) {
        console.log(ftp.LastErrorText);
        return;
    }

    //  SslServerCertVerified reports whether the certificate chain was successfully verified.
    if (ftp.SslServerCertVerified) {
        console.log("The server certificate was verified.");
    }

    success = ftp.Disconnect();
    if (success == false) {
        console.log(ftp.LastErrorText);
        return;
    }


}

chilkatExample();