Lua

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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Lua

local chilkat = require("chilkat")

-- 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.

local sftp = chilkat.SFtp.new()

-- Step 1: Connect the SSH transport.  Port 22 is the usual port.
local port = 22
local success = sftp:connect("sftp.example.com", port)
if not success then
    print(sftp.last_error_text)
    return
end

-- Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
local infoRequestXml = sftp:start_keyboard_auth("mySshLogin")
if not sftp.last_method_success then
    print(sftp.last_error_text)
    return
end

print(infoRequestXml)

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

sftp:disconnect()