CkPython

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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import sys
import chilkat

success = False

#  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.

sftp = chilkat.CkSFtp()

#  Step 1: Connect the SSH transport.  Port 22 is the usual port.
port = 22
success = sftp.Connect("sftp.example.com",port)
if (success == False):
    print(sftp.lastErrorText())
    sys.exit()

#  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
infoRequestXml = sftp.startKeyboardAuth("mySshLogin")
if (sftp.get_LastMethodSuccess() == False):
    print(sftp.lastErrorText())
    sys.exit()

print(infoRequestXml)

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

sftp.Disconnect()