VB.NET

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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Dim success As Boolean = False

'  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.

Dim ssh As New Chilkat.Ssh

'  Connect to the SSH server.  Port 22 is the usual SSH port.
Dim sshPort As Integer = 22
success = ssh.Connect("ssh.example.com",sshPort)
If (success = False) Then
    Debug.WriteLine(ssh.LastErrorText)
    Exit Sub
End If


'  Begin keyboard-interactive authentication to receive the server's prompt(s).
Dim infoRequestXml As String = ssh.StartKeyboardAuth("mySshLogin")
If (ssh.LastMethodSuccess = False) Then
    Debug.WriteLine(ssh.LastErrorText)
    Exit Sub
End If


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

'  Submit the response.  The returned XML indicates the next prompt or the final result.
Dim result As String = ssh.ContinueKeyboardAuth(response)
If (ssh.LastMethodSuccess = False) Then
    Debug.WriteLine(ssh.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(result)

ssh.Disconnect()