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Start SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts, which are answered with ContinueKeyboardAuth.

Background: Keyboard-interactive is the prompt-driven authentication method: rather than assuming a single password, the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how SFTP supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask and whether to mask the input.

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Local $bSuccess = False

;  Demonstrates the SFtp.StartKeyboardAuth method, which begins keyboard-interactive
;  authentication.  The only argument is the login name.  It returns XML describing the server's
;  prompts, which are answered with ContinueKeyboardAuth.

$oSftp = ObjCreate("Chilkat.SFtp")

;  Step 1: Connect the SSH transport.  Port 22 is the usual port.
Local $iPort = 22
$bSuccess = $oSftp.Connect("sftp.example.com",$iPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

;  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
Local $sInfoRequestXml = $oSftp.StartKeyboardAuth("mySshLogin")
If ($oSftp.LastMethodSuccess = False) Then
    ConsoleWrite($oSftp.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($sInfoRequestXml & @CRLF)

;  Answer the prompt(s) with ContinueKeyboardAuth, then call InitializeSftp.

$oSftp.Disconnect