Xbase++

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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LOCAL nSuccess
LOCAL oSftp
LOCAL nPort
LOCAL cInfoRequestXml

nSuccess := 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.

oSftp := CreateObject("Chilkat.SFtp")

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
nPort := 22
nSuccess := oSftp:Connect("sftp.example.com", nPort)
IF (nSuccess == 0)
    ? oSftp:LastErrorText
    oSftp:destroy()
    RETURN
ENDIF

//  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
cInfoRequestXml := oSftp:StartKeyboardAuth("mySshLogin")
IF (oSftp:LastMethodSuccess == 0)
    ? oSftp:LastErrorText
    oSftp:destroy()
    RETURN
ENDIF

? cInfoRequestXml

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

oSftp:Disconnect()

oSftp:destroy()