VB.NET

Start SSH Keyboard-Interactive Authentication

Demonstrates the Chilkat Ssh.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts and whether each response should be echoed. Answer the prompts with ContinueKeyboardAuth.

Background: Keyboard-interactive is the flexible, prompt-driven SSH method — the server sends one or more questions (a password, a one-time code, a security question) and the client answers each. It is how SSH supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask the user and whether to mask their input.

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Dim success As Boolean = False

'  Demonstrates the Ssh.StartKeyboardAuth method, which begins keyboard-interactive
'  authentication.  The only argument is the login name.  It returns XML describing the server's
'  prompts and whether each response should be echoed.

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.  The returned XML describes the prompts.
Dim infoRequestXml As String = ssh.StartKeyboardAuth("mySshLogin")
If (ssh.LastMethodSuccess = False) Then
    Debug.WriteLine(ssh.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(infoRequestXml)

'  Answer the prompt(s) with ContinueKeyboardAuth.

ssh.Disconnect()