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from __future__ import print_function
"""M2Crypto support for Python 2.x's httplib.
Copyright (c) 1999-2002 Ng Pheng Siong. All rights reserved."""
import string
from M2Crypto import SSL
from httplib import FakeSocket, HTTP, HTTPConnection, HTTPResponse, HTTPS_PORT
class HTTPSConnection(HTTPConnection):
"""
This class allows communication via SSL using M2Crypto.
"""
default_port = HTTPS_PORT
def __init__(self, host, port=None, **ssl):
keys = ssl.keys()
try:
keys.remove('key_file')
except ValueError:
pass
try:
keys.remove('cert_file')
except ValueError:
pass
try:
keys.remove('ssl_context')
except ValueError:
pass
if keys:
raise ValueError()
try:
self.ssl_ctx = ssl['ssl_context']
assert isinstance(self.ssl_ctx, SSL.Context)
except KeyError:
self.ssl_ctx = SSL.Context('sslv23')
HTTPConnection.__init__(self, host, port)
def connect(self):
self.sock = SSL.Connection(self.ssl_ctx)
self.sock.connect((self.host, self.port))
def close(self):
# This kludges around line 545 of httplib.py,
# which closes the connection in this object;
# the connection remains open in the response
# object.
#
# M2Crypto doesn't close-here-keep-open-there,
# so, in effect, we don't close until the whole
# business is over and gc kicks in.
#
# Long-running callers beware leakage.
#
# 05-Jan-2002: This module works with Python 2.2,
# but I've not investigated if the above conditions
# remain.
pass
class HTTPS(HTTP):
_connection_class = HTTPSConnection
def __init__(self, host='', port=None, **ssl):
HTTP.__init__(self, host, port)
try:
self.ssl_ctx = ssl['ssl_context']
except KeyError:
self.ssl_ctx = SSL.Context('sslv23')
# ISS Added.
# From here, starts the proxy patch
class HTTPProxyConnection(HTTPConnection):
"""
This class provides HTTP access through (authenticated) proxies.
Example:
If the HTTP proxy address is proxy.your.org:8080, an authenticated proxy
(one which requires a username/password combination in order to serve
requests), one can fetch HTTP documents from 'www.webserver.net', port 81:
conn = HTTPProxyConnection('proxy.your.org:8080', 'www.webserver.net',
port=81, username='username', password='password')
conn.connect()
conn.request("HEAD", "/index.html", headers={'X-Custom-Header-1' : 'Value-1'})
resp = conn.getresponse()
...
"""
def __init__(self, proxy, host, port=None, username=None, password=None):
# The connection goes through the proxy
HTTPConnection.__init__(self, proxy)
# save the proxy connection settings
self.__proxy, self.__proxy_port = self.host, self.port
# self.host and self.port will point to the real host
self._set_hostport(host, port)
# save the host and port
self._host, self._port = self.host, self.port
# Authenticated proxies support
self.__username = username
self.__password = password
def connect(self):
"""Connect to the host and port specified in __init__ (through a
proxy)."""
# We are connecting to the proxy, so use the proxy settings
self._set_hostport(self.__proxy, self.__proxy_port)
HTTPConnection.connect(self)
# Restore the real host and port
self._set_hostport(self._host, self._port)
def putrequest(self, method, url):
"""Send a request to the server.
`method' specifies an HTTP request method, e.g. 'GET'.
`url' specifies the object being requested, e.g. '/index.html'.
"""
# The URL has to include the real host
hostname = self._host
if self._port != self.default_port:
hostname = hostname + ':' + str(self._port)
newurl = "http://%s%s" % (hostname, url)
# Piggyback on the parent class
HTTPConnection.putrequest(self, method, newurl)
# Add proxy-specific headers
self._add_auth_proxy_header()
def _add_auth_proxy_header(self):
"""Adds an HTTP header for authenticated proxies
"""
if not self.__username:
# No username, so assume not an authenticated proxy
return
# Authenticated proxy
import base64
userpass = "%s:%s" % (self.__username, self.__password)
enc_userpass = base64.encodestring(userpass).strip()
self.putheader("Proxy-Authorization", "Basic %s" % enc_userpass)
class HTTPSProxyResponse(HTTPResponse):
"""
Replacement class for HTTPResponse
Proxy responses (made through SSL) have to keep the connection open
after the initial request, since the connection is tunneled to the SSL
host with the CONNECT method.
"""
def begin(self):
HTTPResponse.begin(self)
self.will_close = 0
class HTTPSProxyConnection(HTTPProxyConnection):
"""This class provides HTTP access through (authenticated) proxies.
Example:
If the HTTP proxy address is proxy.your.org:8080, an authenticated proxy
(one which requires a username/password combination in order to serve
requests), one can fetch HTTP documents from 'www.webserver.net', port 81:
conn = HTTPProxyConnection('proxy.your.org:8080', 'www.webserver.net',
port=81, username='username', password='password')
conn.connect()
conn.request("HEAD", "/index.html", headers={'X-Custom-Header-1' : 'Value-1'})
resp = conn.getresponse()
...
To avoid dealing with multiple inheritance, this class only inherits from
HTTPProxyConnection.
"""
default_port = HTTPSConnection.default_port
def __init__(self, proxy, host, port=None, username=None, password=None, **x509):
for key in x509.keys():
if key not in ['cert_file', 'key_file', 'ssl_context']:
raise ValueError()
self.key_file = x509.get('key_file')
self.cert_file = x509.get('cert_file')
#ISS Added
self.ssl_ctx = x509.get('ssl_context')
# Piggybacking on HTTPProxyConnection
HTTPProxyConnection.__init__(self, proxy, host, port, username, password)
def connect(self):
"""Connect (using SSL) to the host and port specified in __init__
(through a proxy)."""
import socket
# Set the connection with the proxy
HTTPProxyConnection.connect(self)
# Use the stock HTTPConnection putrequest
host = "%s:%s" % (self._host, self._port)
HTTPConnection.putrequest(self, "CONNECT", host)
# Add proxy-specific stuff
self._add_auth_proxy_header()
# And send the request
HTTPConnection.endheaders(self)
# Save the response class
response_class = self.response_class
# And replace the response class with our own one, which does not
# close the connection
self.response_class = HTTPSProxyResponse
response = HTTPConnection.getresponse(self)
# Restore the response class
self.response_class = response_class
# Close the response object manually
response.close()
if response.status != 200:
# Close the connection manually
self.close()
# XXX Find the appropriate error code
raise socket.error(1001, response.status, response.value)
# NgPS: I haven't read the code recently, but I think it is
# reasonable to assume that self.sock is a connected TCP socket at
# this point.
# Use the real stuff. ;-)
if self.ssl_ctx and isinstance(self.ssl_ctx, SSL.Context):
self.sock = SSL.Connection(self.ssl_ctx)
self.sock.connect((self.host, self.port))
else:
# Fake the socket
ssl = socket.ssl(self.sock, self.key_file, self.cert_file)
self.sock = FakeSocket(self.sock, ssl)
if self.debuglevel > 0: print('socket type:', self.sock)
def putrequest(self, method, url):
"""Send a request to the server.
`method' specifies an HTTP request method, e.g. 'GET'.
`url' specifies the object being requested, e.g. '/index.html'.
"""
# bypass the parent class's putrequest: use the grandparent's one :-)
return HTTPConnection.putrequest(self, method, url)
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