CkPython

SSH Tunnel Uncommon Options

Demonstrates the UncommonOptions property, which enables optional behavior for uncommon requirements. The default is an empty string; provide a comma-separated list of keywords to enable more than one option. Available keywords are listed in the reference documentation.

Background: This is a catch-all for narrow workarounds that do not warrant their own properties — forcing a specific signature algorithm, disabling the periodic keep-alive, removing weak MACs, bypassing a VPN on Android, and so on. Most applications never set it. When you do, it is usually to satisfy a particular server's quirk or a specific security requirement, and the exact keyword matters, so consult the documented list rather than guessing.

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import sys
import chilkat

success = False

#  Demonstrates the SshTunnel.UncommonOptions property, which enables optional behavior for
#  uncommon requirements.  The default is an empty string, appropriate for most applications.
#  Provide a comma-separated list of keywords to enable more than one option.

tunnel = chilkat.CkSshTunnel()

#  For example, disable the periodic keep-alive ignore message and remove weak MAC algorithms
#  from those offered.  Available keywords are listed in the reference documentation.
tunnel.put_UncommonOptions("NoKeepAliveIgnoreMsg,no-weak-mac-algs")

tunnel.put_DestHostname("db.internal.example.com")
tunnel.put_DestPort(5432)

sshPort = 22
success = tunnel.Connect("ssh.example.com",sshPort)
if (success == False):
    print(tunnel.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"

success = tunnel.AuthenticatePw("mySshLogin",password)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

listenPort = 1080
success = tunnel.BeginAccepting(listenPort)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

print("Tunnel established.")

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