CkPython

Continue SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.ContinueKeyboardAuth method, which submits a response to a keyboard-interactive prompt. The only argument is the response text; for a request with multiple prompts, an XML response is supplied instead. It returns XML indicating the next prompt or the final result.

Background: This is the second half of the exchange started by StartKeyboardAuth. A server may issue several rounds of prompts, so a robust client loops: submit answers, read the returned XML, and continue until it sees success or failure. On success, remember that InitializeSftp still must be called before any file operation.

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import sys
import chilkat

success = False

#  Demonstrates the SFtp.ContinueKeyboardAuth method, which submits a response to a
#  keyboard-interactive prompt.  The only argument is the response.  For multiple prompts, an
#  XML response is supplied instead.

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 to receive the server's prompt(s).
infoRequestXml = sftp.startKeyboardAuth("mySshLogin")
if (sftp.get_LastMethodSuccess() == False):
    print(sftp.lastErrorText())
    sys.exit()

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
password = "mySshPassword"

#  Submit the response (typically the password).  The returned XML indicates the next prompt or
#  the final result.
result = sftp.continueKeyboardAuth(password)
if (sftp.get_LastMethodSuccess() == False):
    print(sftp.lastErrorText())
    sys.exit()

print(result)

#  On success, initialize the SFTP subsystem.
success = sftp.InitializeSftp()
if (success == False):
    print(sftp.lastErrorText())
    sys.exit()

sftp.Disconnect()