DataFlex

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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Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSsh
    Integer iSshPort
    String sInfoRequestXml
    String sResponse
    String sResult
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

    //  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.

    Get Create (RefClass(cComChilkatSsh)) To hoSsh
    If (Not(IsComObjectCreated(hoSsh))) Begin
        Send CreateComObject of hoSsh
    End

    //  Connect to the SSH server.  Port 22 is the usual SSH port.
    Move 22 To iSshPort
    Get ComConnect Of hoSsh "ssh.example.com" iSshPort To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Begin keyboard-interactive authentication to receive the server's prompt(s).
    Get ComStartKeyboardAuth Of hoSsh "mySshLogin" To sInfoRequestXml
    Get ComLastMethodSuccess Of hoSsh To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

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

    //  Submit the response.  The returned XML indicates the next prompt or the final result.
    Get ComContinueKeyboardAuth Of hoSsh sResponse To sResult
    Get ComLastMethodSuccess Of hoSsh To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln sResult

    Send ComDisconnect To hoSsh


End_Procedure