CkPython

Start SSH Tunnel Keyboard-Interactive Authentication

Demonstrates the Chilkat SshTunnel.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: the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how a tunnel supports two-factor and other challenge-response schemes. The returned XML says exactly what to ask and whether to mask the input.

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import sys
import chilkat

success = False

#  Demonstrates the SshTunnel.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.

tunnel = chilkat.CkSshTunnel()

#  The tunnel forwards accepted local connections to this destination through the SSH server.
tunnel.put_DestHostname("db.internal.example.com")
tunnel.put_DestPort(5432)

#  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
#  does not authenticate yet.
sshPort = 22
success = tunnel.Connect("ssh.example.com",sshPort)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

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

print(infoRequestXml)

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

waitForThreadExit = True
success = tunnel.CloseTunnel(waitForThreadExit)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()