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mgeeky-Penetration-Testing-.../networks/host-scanner-via-udp.py

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Python
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#!/usr/bin/python
#
# Simple UDP scanner determining whether scanned host replies with
# ICMP Desitnation Unreachable upon receiving UDP packet on some high, closed port.
#
# Based on "Black Hat Python" book by Justin Seitz.
#
# Mariusz B.
#
import os
import sys
import time
import ctypes
import struct
import socket
import threading
from datetime import datetime
try:
from netaddr import IPNetwork, IPAddress
except ImportError:
print('[!] No module named "netaddr". Please type:\n\tpip install netaddr')
sys.exit(1)
DEBUG = False
# Ports that will be used during scanning, considered as most likely closed ports.
SCAN_PORTS = range(65212, 65220)
HOSTS_UP = set()
MAGIC_MESSAGE = '\xec\xcb\x5c\x6f\x41\xbe\x2e\x71\x9e\xd1'
class ICMP(ctypes.Structure):
_fields_ = [
('type', ctypes.c_ubyte),
('code', ctypes.c_ubyte),
('chksum', ctypes.c_ushort),
('unused', ctypes.c_ushort),
('nexthop', ctypes.c_ushort)
]
def __new__(self, sockBuff = None):
return self.from_buffer_copy(sockBuff)
def __init__(self, sockBuff = None):
self.types_map = {
0:'Echo Reply',1:'Unassigned',2:'Unassigned ',3:'Destination Unreachable',
4:'Source Quench',5:'Redirect',6:'Alternate Host Address',7:'Unassigned',
8:'Echo',9:'Router Advertisement',10:'Router Solicitation',11:'Time Exceeded',
12:'Parameter Problem',13:'Timestamp',14:'Timestamp Reply',15:'Information Request',
16:'Information Reply',17:'Address Mask Request',18:'Address Mask Reply',
30:'Traceroute',31:'Datagram Conversion Error',32:'Mobile Host Redirect',
33:'IPv6 Where-Are-You',34:'IPv6 I-Am-Here',35:'Mobile Registration Request',
36:'Mobile Registration Reply',37:'Domain Name Request',38:'Domain Name Reply',
39:'SKIP',40:'Photuris'
}
# Human readable protocol
try:
self.message = self.types_map[self.type]
except:
self.message = str('')
#
# IPv4 packet structure definition in ctypes.
#
class IP(ctypes.Structure):
_fields_ = [
('ihl', ctypes.c_ubyte, 4),
('version', ctypes.c_ubyte, 4),
('tos', ctypes.c_ubyte),
('len', ctypes.c_ushort),
('id', ctypes.c_ushort),
('offset', ctypes.c_ushort),
('ttl', ctypes.c_ubyte),
('protocol_num', ctypes.c_ubyte),
('sum', ctypes.c_ushort),
('src', ctypes.c_uint),
('dst', ctypes.c_uint)
]
def __new__(self, socketBuffer = None):
return self.from_buffer_copy(socketBuffer)
def __init__(self, socketBuffer = None):
# Map protocol constants to their names.
self.protocol_map = {
0:'HOPOPT',1:'ICMP',2:'IGMP',3:'GGP',4:'IPv4',5:'ST',6:'TCP',7:'CBT',8:'EGP',
9:'IGP',10:'BBN-RCC-MON',11:'NVP-II',12:'PUP',13:'ARGUS',14:'EMCON',15:'XNET',16:'CHAOS',
17:'UDP',18:'MUX',19:'DCN-MEAS',20:'HMP',21:'PRM',22:'XNS-IDP',23:'TRUNK-1',24:'TRUNK-2',
25:'LEAF-1',26:'LEAF-2',27:'RDP',28:'IRTP',29:'ISO-TP4',30:'NETBLT',31:'MFE-NSP',32:'MERIT-INP',
33:'DCCP',34:'3PC',35:'IDPR',36:'XTP',37:'DDP',38:'IDPR-CMTP',39:'TP++',40:'IL',
41:'IPv6',42:'SDRP',43:'IPv6-Route',44:'IPv6-Frag',45:'IDRP',46:'RSVP',47:'GRE',48:'DSR',
49:'BNA',50:'ESP',51:'AH',52:'I-NLSP',53:'SWIPE',54:'NARP',55:'MOBILE',56:'TLSP',
57:'SKIP',58:'IPv6-ICMP',59:'IPv6-NoNxt',60:'IPv6-Opts',62:'CFTP',64:'SAT-EXPAK',
65:'KRYPTOLAN',66:'RVD',67:'IPPC',69:'SAT-MON',70:'VISA',71:'IPCV',72:'CPNX',
73:'CPHB',74:'WSN',75:'PVP',76:'BR-SAT-MON',77:'SUN-ND',78:'WB-MON',79:'WB-EXPAK',80:'ISO-IP',
81:'VMTP',82:'SECURE-VMTP',83:'VINES',84:'TTP',84:'IPTM',85:'NSFNET-IGP',86:'DGP',87:'TCF',88:'EIGRP',
89:'OSPFIGP',90:'Sprite-RPC',91:'LARP',92:'MTP',93:'AX.25',94:'IPIP',95:'MICP',96:'SCC-SP',
97:'ETHERIP',98:'ENCAP',100:'GMTP',101:'IFMP',102:'PNNI',103:'PIM',104:'ARIS',
105:'SCPS',106:'QNX',107:'A/N',108:'IPComp',109:'SNP',110:'Compaq-Peer',111:'IPX-in-IP',112:'VRRP',
113:'PGM',115:'L2TP',116:'DDX',117:'IATP',118:'STP',119:'SRP',120:'UTI',
121:'SMP',122:'SM',123:'PTP',124:'ISIS',125:'FIRE',126:'CRTP',127:'CRUDP',128:'SSCOPMCE',
129:'IPLT',130:'SPS',131:'PIPE',132:'SCTP',133:'FC',134:'RSVP-E2E-IGNORE',135:'Mobility',136:'UDPLite',
137:'MPLS-in-IP',138:'manet',139:'HIP',140:'Shim6',141:'WESP',142:'ROHC'
}
# Human readable IP addresses.
try:
self.src_address = socket.inet_ntoa(struct.pack('<L', self.src))
except:
print('[!] Could not represent incoming packet\'s source address: {}'.format(self.src))
self.src_address = '127.0.0.1'
try:
self.dst_address = socket.inet_ntoa(struct.pack('<L', self.dst))
except:
print('[!] Could not represent incoming packet\'s destination address: {}'.format(self.dst))
self.dst_address = '127.0.0.1'
# Human readable protocol
try:
self.protocol = self.protocol_map[self.protocol_num]
except:
self.protocol = str(self.protocol_num)
def udpSend(subnet, message):
time.sleep(5)
if DEBUG:
print('[.] Started spraying UDP packets across {}'.format(str(subnet)))
packets = 0
ports = [x for x in SCAN_PORTS]
sender = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
for ip in IPNetwork(subnet):
try:
for port in ports:
sender.sendto(message, (str(ip), port))
packets += 1
except Exception, e:
pass
print('[.] Spraying thread finished. Sent: {} packets on {} hosts.'.format(
packets, len(IPNetwork(subnet))
))
def processPackets(sniffer, subnet):
global HOSTS_UP
# Read in single packet
try:
packetNum = 0
while True:
packetPrint = ''
packetNum += 1
packet = sniffer.recvfrom((1 << 16) - 1)[0]
# Create an IP header from the first 20 bytes of the buffer.
ipHeader = IP(packet[0 : ctypes.sizeof(IP)])
timeNow = datetime.now().strftime('%H:%M:%S.%f')[:-3]
# Print out the protocol that was detected and the hosts.
packetPrint += '[{:05} | {}] {} {} > {}'.format(
packetNum, timeNow, ipHeader.protocol, ipHeader.src_address, ipHeader.dst_address,
)
if ipHeader.protocol == 'ICMP':
offset = ipHeader.ihl * 4
icmpBuf = packet[offset : offset + ctypes.sizeof(ICMP)]
icmpHeader = ICMP(icmpBuf)
packetPrint += ': ICMP Type: {} ({}), Code: {}\n'.format(
icmpHeader.type, icmpHeader.message, icmpHeader.code
)
if DEBUG:
packetPrint += hexdump(packet)
# Destination unreachable
if icmpHeader.code == 3 and icmpHeader.type == 3:
if IPAddress(ipHeader.src_address) in IPNetwork(subnet):
# Make sure it contains our message
if packet[- len(MAGIC_MESSAGE):] == MAGIC_MESSAGE:
host = ipHeader.src_address
if host not in HOSTS_UP:
print('[+] HOST IS UP: {}'.format(host))
HOSTS_UP.add(host)
if DEBUG:
print(packetPrint)
except KeyboardInterrupt:
return
def hexdump(src, length = 16):
result = []
digits = 4 if isinstance(src, unicode) else 2
num = len(src)
for i in range(0, num, length):
s = src[i:i+length]
hexa = b' '.join(['%0*X' % (digits, ord(x)) for x in s])
text = b''.join([x if 0x20 <= ord(x) < 0x7f else b'.' for x in s])
result.append(b'%04x | %-*s | %s' % (i, length * (digits + 1), hexa, text))
return '\n'.join(result)
def main(argv):
global BIND
if len(argv) < 3:
print('Usage: ./udp-scan.py <bind-ip> <target-subnet>')
sys.exit(1)
bindAddr = sys.argv[1]
subnet = sys.argv[2]
sockProto = None
if os.name == 'nt':
sockProto = socket.IPPROTO_IP
else:
sockProto = socket.IPPROTO_ICMP
sniffer = socket.socket(socket.AF_INET, socket.SOCK_RAW, sockProto)
if DEBUG: print('[.] Binding on {}:0'.format(bindAddr))
sniffer.bind((bindAddr, 0))
# Include IP headers in the capture
sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
# In Windows, set up promiscous mode.
if os.name == 'nt':
try:
sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_ON)
except socket.error, e:
print('[!] Could not set promiscous mode ON: "{}"'.format(str(e)))
# Sending thread
threading.Thread(target=udpSend, args=(subnet, MAGIC_MESSAGE)).start()
# Receiving thread
recvThread = threading.Thread(target=processPackets, args=(sniffer, subnet))
recvThread.daemon = True
recvThread.start()
time.sleep(15)
if DEBUG: print('[.] Breaking response wait loop.')
# Turn off promiscous mode
if os.name == 'nt':
try:
sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_OFF)
except socket.error, e:
pass
if __name__ == '__main__':
main(sys.argv)
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