CkPython

SSH Through a SOCKS Proxy

Demonstrates connecting to an SSH server through a SOCKS4 or SOCKS5 proxy. Set the SOCKS properties before calling Connect, and set SocksVersion to match the proxy server.

Background: SOCKS is a general-purpose TCP relay, so unlike an HTTP proxy it is designed from the start to carry arbitrary protocols — usually the smoother option for SSH. The version matters: SOCKS4 supports only a username with no password, while SOCKS5 supports full login/password authentication as well as IPv6 and remote DNS resolution. Note this is the inverse of dynamic port forwarding: here a SOCKS proxy is used to reach the SSH server, rather than SSH providing a SOCKS proxy.

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import sys
import chilkat

success = False

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

#  Demonstrates connecting to an SSH server through a SOCKS4 or SOCKS5 proxy.

ssh = chilkat.CkSsh()

#  Set the SOCKS proxy properties before connecting.  The hostname may be a domain name or an
#  IP address.
ssh.put_SocksHostname("socks.example.com")
ssh.put_SocksPort(1080)
ssh.put_SocksUsername("mySocksLogin")
ssh.put_SocksPassword("mySocksPassword")

#  Set the version to match the proxy server: 4 or 5.
#  Note: SOCKS4 supports only a username, with no password.  SOCKS5 supports full
#  login/password authentication.
ssh.put_SocksVersion(5)

hostname = "ssh.example.com"
port = 22
success = ssh.Connect(hostname,port)
if (success == False):
    print(ssh.lastErrorText())
    sys.exit()

print("Connected to the SSH server through the SOCKS proxy.")

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

#  ... use the SSH connection normally ...

ssh.Disconnect()