Chilkat2-Python

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 chilkat2

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 = chilkat2.Ssh()

# Set the SOCKS proxy properties before connecting.  The hostname may be a domain name or an
# IP address.
ssh.SocksHostname = "socks.example.com"
ssh.SocksPort = 1080
ssh.SocksUsername = "mySocksLogin"
ssh.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.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()