File: proxy.py

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#!/usr/bin/env python
#
# This script demonstrates how one can use pyOpenSSL to speak SSL over an HTTP
# proxy
# The challenge here is to start talking SSL over an already connected socket
#
# Author: Mihai Ibanescu <misa@redhat.com>
#
# $Id: proxy.py,v 1.2 2004/07/22 12:01:25 martin Exp $

import sys
import socket
import string

from OpenSSL import SSL


def usage(exit_code=0):
    print "Usage: %s server[:port] proxy[:port]" % sys.argv[0]
    print "  Connects SSL to the specified server (port 443 by default)"
    print "    using the specified proxy (port 8080 by default)"
    sys.exit(exit_code)


def main():
    # Command-line processing
    if len(sys.argv) != 3:
        usage(-1)

    server, proxy = sys.argv[1:3]

    run(split_host(server, 443), split_host(proxy, 8080))


def split_host(hostname, default_port=80):
    a = string.split(hostname, ':', 1)
    if len(a) == 1:
        a.append(default_port)
    return a[0], int(a[1])


# Connects to the server, through the proxy
def run(server, proxy):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        s.connect(proxy)
    except socket.error, e:
        print "Unable to connect to %s:%s %s" % (proxy[0], proxy[1], str(e))
        sys.exit(-1)

    # Use the CONNECT method to get a connection to the actual server
    s.send("CONNECT %s:%s HTTP/1.0\n\n" % (server[0], server[1]))
    print "Proxy response: %s" % string.strip(s.recv(1024))

    ctx = SSL.Context(SSL.SSLv23_METHOD)
    conn = SSL.Connection(ctx, s)

    # Go to client mode
    conn.set_connect_state()

    # start using HTTP

    conn.send("HEAD / HTTP/1.0\n\n")
    print "Sever response:"
    print "-" * 40
    while 1:
        try:
            buff = conn.recv(4096)
        except SSL.ZeroReturnError:
            # we're done
            break

        print buff,


if __name__ == '__main__':
    main()