Xbase++

Continue SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.ContinueKeyboardAuth method, which submits a response to a keyboard-interactive prompt. The only argument is the response text; for a request with multiple prompts, an XML response is supplied instead. It returns XML indicating the next prompt or the final result.

Background: This is the second half of the exchange started by StartKeyboardAuth. A server may issue several rounds of prompts, so a robust client loops: submit answers, read the returned XML, and continue until it sees success or failure. On success, remember that InitializeSftp still must be called before any file operation.

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LOCAL nSuccess
LOCAL oSftp
LOCAL nPort
LOCAL cInfoRequestXml
LOCAL cPassword
LOCAL cResult

nSuccess := 0

//  Demonstrates the SFtp.ContinueKeyboardAuth method, which submits a response to a
//  keyboard-interactive prompt.  The only argument is the response.  For multiple prompts, an
//  XML response is supplied instead.

oSftp := CreateObject("Chilkat.SFtp")

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
nPort := 22
nSuccess := oSftp:Connect("sftp.example.com", nPort)
IF (nSuccess == 0)
    ? oSftp:LastErrorText
    oSftp:destroy()
    RETURN
ENDIF

//  Begin keyboard-interactive authentication to receive the server's prompt(s).
cInfoRequestXml := oSftp:StartKeyboardAuth("mySshLogin")
IF (oSftp:LastMethodSuccess == 0)
    ? oSftp:LastErrorText
    oSftp:destroy()
    RETURN
ENDIF

//  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.
cPassword := "mySshPassword"

//  Submit the response (typically the password).  The returned XML indicates the next prompt or
//  the final result.
cResult := oSftp:ContinueKeyboardAuth(cPassword)
IF (oSftp:LastMethodSuccess == 0)
    ? oSftp:LastErrorText
    oSftp:destroy()
    RETURN
ENDIF

? cResult

//  On success, initialize the SFTP subsystem.
nSuccess := oSftp:InitializeSftp()
IF (nSuccess == 0)
    ? oSftp:LastErrorText
    oSftp:destroy()
    RETURN
ENDIF

oSftp:Disconnect()

oSftp:destroy()