CkPython

Use an Existing Socket SSH Tunnel

Demonstrates the Chilkat MailMan.UseSshTunnel method, which configures MailMan to use an existing SSH tunnel provided by a Socket object for its SMTP and POP3 connections. This example opens and authenticates a tunnel on a Socket, hands it to MailMan, and then verifies an SMTP login through it.

Background: Sharing one already-established SSH tunnel across objects avoids opening (and authenticating) a separate SSH connection for every component that needs to reach the remote network. Here the tunnel lives on a Socket object, which MailMan then routes its SMTP/POP3 traffic through. It is the Socket-based sibling of UseSsh, which shares an Ssh object instead.

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import sys
import chilkat

success = False

#  Demonstrates the MailMan.UseSshTunnel method, which configures MailMan to use an existing
#  SSH tunnel provided by a Socket object for its SMTP and POP3 connections.

#  Open and authenticate the SSH tunnel using a Socket object.
sshTunnel = chilkat.CkSocket()
success = sshTunnel.SshOpenTunnel("ssh.example.com",22)
if (success == False):
    print(sshTunnel.lastErrorText())
    sys.exit()

success = sshTunnel.SshAuthenticatePw("sshUser","sshPassword")
if (success == False):
    print(sshTunnel.lastErrorText())
    sys.exit()

mailman = chilkat.CkMailMan()

#  Configure the SMTP server connection.  These connections will travel through the tunnel.
mailman.put_SmtpHost("smtp.example.com")
mailman.put_SmtpPort(465)
mailman.put_SmtpSsl(True)
mailman.put_SmtpUsername("user@example.com")
mailman.put_SmtpPassword("myPassword")

#  Tell MailMan to route its connections through the existing tunnel.
success = mailman.UseSshTunnel(sshTunnel)
if (success == False):
    print(mailman.lastErrorText())
    sys.exit()

#  SMTP operations now travel through the shared SSH tunnel.
success = mailman.VerifySmtpLogin()
if (success == False):
    print(mailman.lastErrorText())
    sys.exit()

print("Authenticated with the SMTP server through the SSH tunnel.")