Visual FoxPro

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 lnSuccess
LOCAL loSftp
LOCAL lnPort
LOCAL lcInfoRequestXml

lnSuccess = 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.

loSftp = CreateObject('Chilkat.SFtp')

*  Step 1: Connect the SSH transport.  Port 22 is the usual port.
lnPort = 22
lnSuccess = loSftp.Connect("sftp.example.com",lnPort)
IF (lnSuccess = 0) THEN
    ? loSftp.LastErrorText
    RELEASE loSftp
    CANCEL
ENDIF

*  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
lcInfoRequestXml = loSftp.StartKeyboardAuth("mySshLogin")
IF (loSftp.LastMethodSuccess = 0) THEN
    ? loSftp.LastErrorText
    RELEASE loSftp
    CANCEL
ENDIF

? lcInfoRequestXml

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

loSftp.Disconnect()

RELEASE loSftp