Lianja

FTP over Implicit TLS (Ssl, AuthSsl, AutoFix)

Demonstrates the SSL/TLS connection-mode properties Ssl, AuthSsl, and AutoFix. Setting Ssl true selects implicit FTPS, in which TLS begins immediately after the TCP connection on port 990.

Background: FTP has two ways to add TLS: implicit (this example) starts encrypted from the first byte on a dedicated port, 990; explicit (via AuthTls) connects in the clear on port 21 and issues AUTH TLS to upgrade. Explicit is the modern standard; implicit persists mainly for legacy servers. AuthSsl is an obsolete AUTH SSL variant to avoid. AutoFix, on by default, infers the mode from the port — disable it when you set these properties explicitly so it does not override your choice.

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llSuccess = .F.

loFtp = createobject("CkFtp2")

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

//  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.
loFtp.Password = "myPassword"

//  Ssl = .T. selects IMPLICIT FTPS: TLS begins immediately after the TCP connection, before
//  the greeting.  Port 990 is conventional for implicit FTPS.  Ssl takes priority over AuthTls
//  and AuthSsl.
loFtp.Ssl = .T.
loFtp.Port = 990

//  AuthSsl selects the legacy AUTH SSL command and is very uncommon -- use AuthTls (explicit
//  FTPS) for modern servers instead.  Left .F. here.
loFtp.AuthSsl = .F.

//  AutoFix (default .T.) automatically adjusts Ssl/AuthTls/AuthSsl based solely on the Port
//  (21 or 990).  Disable it when setting these properties explicitly, as here.
loFtp.AutoFix = .F.

llSuccess = loFtp.Connect()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    return
endif

? "Connected using implicit FTPS."

llSuccess = loFtp.Disconnect()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    return
endif



release loFtp