DataFlex

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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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoFtp
    String sTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatFtp2)) To hoFtp
    If (Not(IsComObjectCreated(hoFtp))) Begin
        Send CreateComObject of hoFtp
    End

    Set ComHostname Of hoFtp To "ftp.example.com"
    Set ComUsername Of hoFtp To "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.
    Set ComPassword Of hoFtp To "myPassword"

    //  Ssl = True 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.
    Set ComSsl Of hoFtp To True
    Set ComPort Of hoFtp To 990

    //  AuthSsl selects the legacy AUTH SSL command and is very uncommon -- use AuthTls (explicit
    //  FTPS) for modern servers instead.  Left False here.
    Set ComAuthSsl Of hoFtp To False

    //  AutoFix (default True) automatically adjusts Ssl/AuthTls/AuthSsl based solely on the Port
    //  (21 or 990).  Disable it when setting these properties explicitly, as here.
    Set ComAutoFix Of hoFtp To False

    Get ComConnect Of hoFtp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Connected using implicit FTPS."

    Get ComDisconnect Of hoFtp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End



End_Procedure