CkPython

SSH Tunnel with Dynamic Port Forwarding

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Demonstrates how to start a background thread that runs a portable SSH tunnel w/ dynamic port forwarding that the foreground thread can use for establishing connections through an SSH tunnel. CkPython

import sys
import chilkat

success = False

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

success = False

tunnel = chilkat.CkSshTunnel()

sshHostname = "sftp.example.com"
sshPort = 22

# Connect to an SSH server and establish the SSH tunnel:
success = tunnel.Connect(sshHostname,sshPort)
if (success != True):
    print(tunnel.lastErrorText())
    sys.exit()

# Authenticate with the SSH server via a login/password
# or with a public key.  
# This example demonstrates SSH password authentication.
success = tunnel.AuthenticatePw("mySshLogin","mySshPassword")
if (success != True):
    print(tunnel.lastErrorText())
    sys.exit()

# Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
# with dynamic port forwarding:
tunnel.put_DynamicPortForwarding(True)

# We may optionally require that connecting clients authenticate with our SOCKS proxy server.
# To do this, set an inbound username/password.  Any connecting clients would be required to 
# use SOCKS5 with the correct username/password.
# If no inbound username/password is set, then our SOCKS proxy server will accept both
# SOCKS4 and SOCKS5 unauthenticated connections.

tunnel.put_InboundSocksUsername("chilkat123")
tunnel.put_InboundSocksPassword("password123")

# Start the listen/accept thread to begin accepting SOCKS proxy client connections.
# Listen on port 1080.
success = tunnel.BeginAccepting(1080)
if (success != True):
    print(tunnel.lastErrorText())
    sys.exit()

# Now that a background thread is running a SOCKS proxy server that forwards connections
# through an SSH tunnel, it is possible to use any Chilkat implemented protocol that is SOCKS capable,
# such as HTTP, POP3, SMTP, IMAP, FTP, etc.  The protocol may use SSL/TLS because the SSL/TLS
# will be passed through the SSH tunnel to the end-destination.  Also, any number of simultaneous
# connections may be routed through the SSH tunnel.

# For this example, let's do a simple HTTPS request:
url = "https://www.ethereum.org/"

http = chilkat.CkHttp()

# Indicate that the HTTP object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
http.put_SocksHostname("localhost")
http.put_SocksPort(1080)
http.put_SocksVersion(5)
http.put_SocksUsername("chilkat123")
http.put_SocksPassword("password123")

http.put_SendCookies(True)
http.put_SaveCookies(True)
http.put_CookieDir("memory")

# Do the HTTPS page fetch (through the SSH tunnel)
html = http.quickGetStr(url)
if (http.get_LastMethodSuccess() != True):
    print(http.lastErrorText())
    sys.exit()

# Stop the background listen/accept thread:
waitForThreadExit = True
success = tunnel.StopAccepting(waitForThreadExit)
if (success != True):
    print(tunnel.lastErrorText())
    sys.exit()

# Close the SSH tunnel (would also kick any remaining connected clients).
success = tunnel.CloseTunnel(waitForThreadExit)
if (success != True):
    print(tunnel.lastErrorText())
    sys.exit()