Xbase++

Continue SSH Keyboard-Interactive Authentication

Demonstrates the Chilkat Ssh.ContinueKeyboardAuth method, which submits a response to a keyboard-interactive prompt. The only argument is the response text; for a request containing 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 keyboard-interactive 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 authentication succeeds or fails. Prompt responses are typically secrets, so obtain them from interactive input rather than embedding them in code.

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LOCAL nSuccess
LOCAL oSsh
LOCAL nSshPort
LOCAL cInfoRequestXml
LOCAL cResponse
LOCAL cResult

nSuccess := 0

//  Demonstrates the Ssh.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.

oSsh := CreateObject("Chilkat.Ssh")

//  Connect to the SSH server.  Port 22 is the usual SSH port.
nSshPort := 22
nSuccess := oSsh:Connect("ssh.example.com", nSshPort)
IF (nSuccess == 0)
    ? oSsh:LastErrorText
    oSsh:destroy()
    RETURN
ENDIF

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

//  Normally you would not hard-code the response (typically the password) in source.  You
//  should instead obtain it from an interactive prompt.
cResponse := "mySshPassword"

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

? cResult

oSsh:Disconnect()

oSsh:destroy()