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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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Local $bSuccess = False

$oFtp = ObjCreate("Chilkat.Ftp2")

$oFtp.Hostname = "ftp.example.com"
$oFtp.Username = "myFtpLogin"

$oFtp.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.
$oFtp.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.
$oFtp.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.
$oFtp.TlsPinSet = "sha256//YLh1dUR9y6Kja30RrAn7JKnbQG/uEtLMkBgFF2Fuihg="

$bSuccess = $oFtp.Connect()
If ($bSuccess = False) Then
    ConsoleWrite($oFtp.LastErrorText & @CRLF)
    Exit
EndIf

;  SslServerCertVerified reports whether the certificate chain was successfully verified.
If ($oFtp.SslServerCertVerified) Then
    ConsoleWrite("The server certificate was verified." & @CRLF)
EndIf

$bSuccess = $oFtp.Disconnect()
If ($bSuccess = False) Then
    ConsoleWrite($oFtp.LastErrorText & @CRLF)
    Exit
EndIf