Visual Basic 6.0

Start SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts, which are answered with ContinueKeyboardAuth.

Background: Keyboard-interactive is the prompt-driven authentication method: rather than assuming a single password, the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how SFTP supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask and whether to mask the input.

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Visual Basic 6.0

Dim success As Long
success = 0

'  Demonstrates the SFtp.StartKeyboardAuth method, which begins keyboard-interactive
'  authentication.  The only argument is the login name.  It returns XML describing the server's
'  prompts, which are answered with ContinueKeyboardAuth.

Dim sftp As New ChilkatSFtp

'  Step 1: Connect the SSH transport.  Port 22 is the usual port.
Dim port As Long
port = 22
success = sftp.Connect("sftp.example.com",port)
If (success = 0) Then
    Debug.Print sftp.LastErrorText
    Exit Sub
End If

'  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
Dim infoRequestXml As String
infoRequestXml = sftp.StartKeyboardAuth("mySshLogin")
If (sftp.LastMethodSuccess = 0) Then
    Debug.Print sftp.LastErrorText
    Exit Sub
End If

Debug.Print infoRequestXml

'  Answer the prompt(s) with ContinueKeyboardAuth, then call InitializeSftp.

sftp.Disconnect