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# SECUREAUTH LABS. Copyright 2018 SecureAuth Corporation. All rights reserved. 

# 

# This software is provided under under a slightly modified version 

# of the Apache Software License. See the accompanying LICENSE file 

# for more information. 

# 

# Description: 

# Convenience packet unpackers for various network protocols 

# implemented in the ImpactPacket module. 

# 

# Author: 

# Javier Burroni (javier) 

# Bruce Leidl (brl) 

# Aureliano Calvo 

 

import array 

 

from impacket import ICMP6 

from impacket import IP6 

from impacket import IP6_Extension_Headers 

from impacket import ImpactPacket 

from impacket import LOG 

from impacket import dot11 

from impacket import wps, eap, dhcp 

from impacket.cdp import CDP 

 

"""Classes to convert from raw packets into a hierarchy of 

ImpactPacket derived objects. 

 

The protocol of the outermost layer must be known in advance, and the 

packet must be fed to the corresponding decoder. From there it will 

try to decode the raw data into a hierarchy of ImpactPacket derived 

objects; if a layer's protocol is unknown, all the remaining data will 

be wrapped into a ImpactPacket.Data object. 

""" 

 

class Decoder: 

__decoded_protocol = None 

def decode(self, aBuffer): 

pass 

 

def set_decoded_protocol(self, protocol): 

self.__decoded_protocol = protocol 

 

def get_protocol(self, aprotocol): 

protocol = self.__decoded_protocol 

while protocol: 

if protocol.__class__ == aprotocol: 

break 

protocol=protocol.child() 

return protocol 

 

def __str__(self): 

protocol = self.__decoded_protocol 

i=0 

out='' 

while protocol: 

tabline=' '*i+'+-'+str(protocol.__class__) 

out+="%s"%tabline+'\n' 

protocol=protocol.child() 

i+=1 

return out 

 

class EthDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

e = ImpactPacket.Ethernet(aBuffer) 

self.set_decoded_protocol( e ) 

off = e.get_header_size() 

if e.get_ether_type() == ImpactPacket.IP.ethertype: 

self.ip_decoder = IPDecoder() 

packet = self.ip_decoder.decode(aBuffer[off:]) 

elif e.get_ether_type() == IP6.IP6.ethertype: 

self.ip6_decoder = IP6Decoder() 

packet = self.ip6_decoder.decode(aBuffer[off:]) 

elif e.get_ether_type() == ImpactPacket.ARP.ethertype: 

self.arp_decoder = ARPDecoder() 

packet = self.arp_decoder.decode(aBuffer[off:]) 

elif e.get_ether_type() == eap.DOT1X_AUTHENTICATION: 

self.eapol_decoder = EAPOLDecoder() 

packet = self.eapol_decoder.decode(aBuffer[off:]) 

# LLC ? 

elif e.get_ether_type() < 1500: 

self.llc_decoder = LLCDecoder() 

packet = self.llc_decoder.decode(aBuffer[off:]) 

else: 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

 

e.contains(packet) 

return e 

 

# Linux "cooked" capture encapsulation. 

# Used, for instance, for packets returned by the "any" interface. 

class LinuxSLLDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

e = ImpactPacket.LinuxSLL(aBuffer) 

self.set_decoded_protocol( e ) 

off = 16 

if e.get_ether_type() == ImpactPacket.IP.ethertype: 

self.ip_decoder = IPDecoder() 

packet = self.ip_decoder.decode(aBuffer[off:]) 

elif e.get_ether_type() == ImpactPacket.ARP.ethertype: 

self.arp_decoder = ARPDecoder() 

packet = self.arp_decoder.decode(aBuffer[off:]) 

elif e.get_ether_type() == eap.DOT1X_AUTHENTICATION: 

self.eapol_decoder = EAPOLDecoder() 

packet = self.eapol_decoder.decode(aBuffer[off:]) 

else: 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

 

e.contains(packet) 

return e 

 

class IPDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

i = ImpactPacket.IP(aBuffer) 

self.set_decoded_protocol ( i ) 

off = i.get_header_size() 

end = i.get_ip_len() 

# If ip_len == 0 we might be facing TCP segmentation offload, let's calculate the right len 

131 ↛ 132line 131 didn't jump to line 132, because the condition on line 131 was never true if end == 0: 

LOG.warning('IP len reported as 0, most probably because of TCP segmentation offload. Attempting to fix its size') 

i.set_ip_len(len(aBuffer)) 

end = i.get_ip_len() 

 

136 ↛ 137line 136 didn't jump to line 137, because the condition on line 136 was never true if i.get_ip_p() == ImpactPacket.UDP.protocol: 

self.udp_decoder = UDPDecoder() 

packet = self.udp_decoder.decode(aBuffer[off:end]) 

139 ↛ 140line 139 didn't jump to line 140, because the condition on line 139 was never true elif i.get_ip_p() == ImpactPacket.TCP.protocol: 

self.tcp_decoder = TCPDecoder() 

packet = self.tcp_decoder.decode(aBuffer[off:end]) 

142 ↛ 145line 142 didn't jump to line 145, because the condition on line 142 was never false elif i.get_ip_p() == ImpactPacket.ICMP.protocol: 

self.icmp_decoder = ICMPDecoder() 

packet = self.icmp_decoder.decode(aBuffer[off:end]) 

elif i.get_ip_p() == ImpactPacket.IGMP.protocol: 

self.igmp_decoder = IGMPDecoder() 

packet = self.igmp_decoder.decode(aBuffer[off:end]) 

else: 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:end]) 

i.contains(packet) 

return i 

 

class IP6MultiProtocolDecoder(Decoder): 

def __init__(self, a_protocol_id): 

self.protocol_id = a_protocol_id 

 

def decode(self, buffer): 

if self.protocol_id == ImpactPacket.UDP.protocol: 

self.udp_decoder = UDPDecoder() 

packet = self.udp_decoder.decode(buffer) 

162 ↛ 163line 162 didn't jump to line 163, because the condition on line 162 was never true elif self.protocol_id == ImpactPacket.TCP.protocol: 

self.tcp_decoder = TCPDecoder() 

packet = self.tcp_decoder.decode(buffer) 

elif self.protocol_id == ICMP6.ICMP6.protocol: 

self.icmp6_decoder = ICMP6Decoder() 

packet = self.icmp6_decoder.decode(buffer) 

else: 

# IPv6 Extension Headers lookup 

extension_headers = IP6_Extension_Headers.IP6_Extension_Header.get_extension_headers() 

if buffer and self.protocol_id in extension_headers: 

extension_header_decoder_class = extension_headers[self.protocol_id].get_decoder() 

self.extension_header_decoder = extension_header_decoder_class() 

packet = self.extension_header_decoder.decode(buffer) 

else: 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(buffer) 

 

return packet 

 

class IP6Decoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, buffer): 

ip6_packet = IP6.IP6(buffer) 

self.set_decoded_protocol(ip6_packet) 

start_pos = ip6_packet.get_header_size() 

end_pos = ip6_packet.get_payload_length() + start_pos 

contained_protocol = ip6_packet.get_next_header() 

 

multi_protocol_decoder = IP6MultiProtocolDecoder(contained_protocol) 

child_packet = multi_protocol_decoder.decode(buffer[start_pos:end_pos]) 

 

ip6_packet.contains(child_packet) 

return ip6_packet 

 

class HopByHopDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, buffer): 

hop_by_hop = IP6_Extension_Headers.Hop_By_Hop(buffer) 

self.set_decoded_protocol(hop_by_hop) 

start_pos = hop_by_hop.get_header_size() 

contained_protocol = hop_by_hop.get_next_header() 

 

multi_protocol_decoder = IP6MultiProtocolDecoder(contained_protocol) 

child_packet = multi_protocol_decoder.decode(buffer[start_pos:]) 

 

hop_by_hop.contains(child_packet) 

return hop_by_hop 

 

class DestinationOptionsDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, buffer): 

destination_options = IP6_Extension_Headers.Destination_Options(buffer) 

self.set_decoded_protocol(destination_options) 

start_pos = destination_options.get_header_size() 

contained_protocol = destination_options.get_next_header() 

 

multi_protocol_decoder = IP6MultiProtocolDecoder(contained_protocol) 

child_packet = multi_protocol_decoder.decode(buffer[start_pos:]) 

 

destination_options.contains(child_packet) 

return destination_options 

 

class RoutingOptionsDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, buffer): 

routing_options = IP6_Extension_Headers.Routing_Options(buffer) 

self.set_decoded_protocol(routing_options) 

start_pos = routing_options.get_header_size() 

contained_protocol = routing_options.get_next_header() 

 

multi_protocol_decoder = IP6MultiProtocolDecoder(contained_protocol) 

child_packet = multi_protocol_decoder.decode(buffer[start_pos:]) 

 

routing_options.contains(child_packet) 

return routing_options 

 

class ICMP6Decoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, buffer): 

icmp6_packet = ICMP6.ICMP6(buffer) 

self.set_decoded_protocol(icmp6_packet) 

start_pos = icmp6_packet.get_header_size() 

 

self.data_decoder = DataDecoder() 

child_packet = self.data_decoder.decode(buffer[start_pos:]) 

icmp6_packet.contains(child_packet) 

return icmp6_packet 

 

 

class ARPDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

arp = ImpactPacket.ARP(aBuffer) 

self.set_decoded_protocol( arp ) 

off = arp.get_header_size() 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

arp.contains(packet) 

return arp 

 

class UDPDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

u = ImpactPacket.UDP(aBuffer) 

self.set_decoded_protocol( u ) 

off = u.get_header_size() 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

u.contains(packet) 

return u 

 

class TCPDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

t = ImpactPacket.TCP(aBuffer) 

self.set_decoded_protocol( t ) 

off = t.get_header_size() 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

t.contains(packet) 

return t 

 

class IGMPDecoder(Decoder): 

def __init__(self): 

pass 

def decode(self, aBuffer): 

ig = ImpactPacket.IGMP(aBuffer) 

off = ig.get_header_size() 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

ig.contains(packet) 

return ig 

 

 

class IPDecoderForICMP(Decoder): 

"""This class was added to parse the IP header of ICMP unreachables packets 

If you use the "standard" IPDecoder, it might crash (see bug #4870) ImpactPacket.py 

because the TCP header inside the IP header is incomplete""" 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

i = ImpactPacket.IP(aBuffer) 

self.set_decoded_protocol( i ) 

off = i.get_header_size() 

if i.get_ip_p() == ImpactPacket.UDP.protocol: 

self.udp_decoder = UDPDecoder() 

packet = self.udp_decoder.decode(aBuffer[off:]) 

else: 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

i.contains(packet) 

return i 

 

class ICMPDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

ic = ImpactPacket.ICMP(aBuffer) 

self.set_decoded_protocol( ic ) 

off = ic.get_header_size() 

340 ↛ 341line 340 didn't jump to line 341, because the condition on line 340 was never true if ic.get_icmp_type() == ImpactPacket.ICMP.ICMP_UNREACH: 

self.ip_decoder = IPDecoderForICMP() 

packet = self.ip_decoder.decode(aBuffer[off:]) 

else: 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

ic.contains(packet) 

return ic 

 

class DataDecoder(Decoder): 

def decode(self, aBuffer): 

d = ImpactPacket.Data(aBuffer) 

self.set_decoded_protocol( d ) 

return d 

 

class BaseDot11Decoder(Decoder): 

def __init__(self, key_manager=None): 

self.set_key_manager(key_manager) 

 

def set_key_manager(self, key_manager): 

self.key_manager = key_manager 

 

def find_key(self, bssid): 

try: 

key = self.key_manager.get_key(bssid) 

except: 

return False 

return key 

 

class RadioTapDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

rt = dot11.RadioTap(aBuffer) 

self.set_decoded_protocol( rt ) 

 

self.do11_decoder = Dot11Decoder() 

self.do11_decoder.set_key_manager(self.key_manager) 

flags=rt.get_flags() 

380 ↛ 384line 380 didn't jump to line 384, because the condition on line 380 was never false if flags is not None: 

fcs=flags&dot11.RadioTap.RTF_FLAGS.PROPERTY_FCS_AT_END 

self.do11_decoder.FCS_at_end(fcs) 

 

packet = self.do11_decoder.decode(rt.get_body_as_string()) 

 

rt.contains(packet) 

return rt 

 

class Dot11Decoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

self.__FCS_at_end = True 

 

def FCS_at_end(self, fcs_at_end=True): 

self.__FCS_at_end=not not fcs_at_end 

 

def decode(self, aBuffer): 

d = dot11.Dot11(aBuffer, self.__FCS_at_end) 

self.set_decoded_protocol( d ) 

 

type = d.get_type() 

402 ↛ 403line 402 didn't jump to line 403, because the condition on line 402 was never true if type == dot11.Dot11Types.DOT11_TYPE_CONTROL: 

dot11_control_decoder = Dot11ControlDecoder() 

packet = dot11_control_decoder.decode(d.body_string) 

elif type == dot11.Dot11Types.DOT11_TYPE_DATA: 

dot11_data_decoder = Dot11DataDecoder(self.key_manager) 

 

dot11_data_decoder.set_dot11_hdr(d) 

 

packet = dot11_data_decoder.decode(d.body_string) 

411 ↛ 416line 411 didn't jump to line 416, because the condition on line 411 was never false elif type == dot11.Dot11Types.DOT11_TYPE_MANAGEMENT: 

dot11_management_decoder = Dot11ManagementDecoder() 

dot11_management_decoder.set_subtype(d.get_subtype()) 

packet = dot11_management_decoder.decode(d.body_string) 

else: 

data_decoder = DataDecoder() 

packet = data_decoder.decode(d.body_string) 

 

d.contains(packet) 

return d 

 

class Dot11ControlDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

self.__FCS_at_end = True 

 

def FCS_at_end(self, fcs_at_end=True): 

self.__FCS_at_end=not not fcs_at_end 

 

def decode(self, aBuffer): 

d = dot11.Dot11(aBuffer, self.__FCS_at_end) 

self.set_decoded_protocol(d) 

 

self.subtype = d.get_subtype() 

if self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_CONTROL_CLEAR_TO_SEND: 

self.ctrl_cts_decoder = Dot11ControlFrameCTSDecoder() 

packet = self.ctrl_cts_decoder.decode(d.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_CONTROL_ACKNOWLEDGMENT: 

self.ctrl_ack_decoder = Dot11ControlFrameACKDecoder() 

packet = self.ctrl_ack_decoder.decode(d.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_CONTROL_REQUEST_TO_SEND: 

self.ctrl_rts_decoder = Dot11ControlFrameRTSDecoder() 

packet = self.ctrl_rts_decoder.decode(d.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_CONTROL_POWERSAVE_POLL: 

self.ctrl_pspoll_decoder = Dot11ControlFramePSPollDecoder() 

packet = self.ctrl_pspoll_decoder.decode(d.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_CONTROL_CF_END: 

self.ctrl_cfend_decoder = Dot11ControlFrameCFEndDecoder() 

packet = self.ctrl_cfend_decoder.decode(d.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_CONTROL_CF_END_CF_ACK: 

self.ctrl_cfendcfack_decoder = Dot11ControlFrameCFEndCFACKDecoder() 

packet = self.ctrl_cfendcfack_decoder.decode(d.body_string) 

else: 

data_decoder = DataDecoder() 

packet = data_decoder.decode(d.body_string) 

 

d.contains(packet) 

return d 

 

class Dot11ControlFrameCTSDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ControlFrameCTS(aBuffer) 

self.set_decoded_protocol(p) 

return p 

 

class Dot11ControlFrameACKDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ControlFrameACK(aBuffer) 

self.set_decoded_protocol(p) 

return p 

 

class Dot11ControlFrameRTSDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ControlFrameRTS(aBuffer) 

self.set_decoded_protocol(p) 

return p 

 

class Dot11ControlFramePSPollDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ControlFramePSPoll(aBuffer) 

self.set_decoded_protocol(p) 

return p 

 

class Dot11ControlFrameCFEndDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ControlFrameCFEnd(aBuffer) 

self.set_decoded_protocol(p) 

return p 

class Dot11ControlFrameCFEndCFACKDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ControlFrameCFEndCFACK(aBuffer) 

self.set_decoded_protocol(p) 

return p 

 

class Dot11DataDecoder(BaseDot11Decoder): 

def __init__(self, key_manager): 

BaseDot11Decoder.__init__(self, key_manager) 

 

def set_dot11_hdr(self, dot11_obj): 

self.dot11 = dot11_obj 

 

def decode(self, aBuffer): 

521 ↛ 522line 521 didn't jump to line 522, because the condition on line 521 was never true if self.dot11.get_fromDS() and self.dot11.get_toDS(): 

if self.dot11.is_QoS_frame(): 

p = dot11.Dot11DataAddr4QoSFrame(aBuffer) 

else: 

p = dot11.Dot11DataAddr4Frame(aBuffer) 

526 ↛ 527line 526 didn't jump to line 527, because the condition on line 526 was never true elif self.dot11.is_QoS_frame(): 

p = dot11.Dot11DataQoSFrame(aBuffer) 

else: 

p = dot11.Dot11DataFrame(aBuffer) 

self.set_decoded_protocol( p ) 

 

if not self.dot11.get_protectedFrame(): 

self.llc_decoder = LLCDecoder() 

packet = self.llc_decoder.decode(p.body_string) 

else: 

536 ↛ 538line 536 didn't jump to line 538, because the condition on line 536 was never false if not self.dot11.get_fromDS() and self.dot11.get_toDS(): 

bssid = p.get_address1() 

elif self.dot11.get_fromDS() and not self.dot11.get_toDS(): 

bssid = p.get_address2() 

elif not self.dot11.get_fromDS() and not self.dot11.get_toDS(): 

bssid = p.get_address3() 

else: 

# WDS, this is the RA 

bssid = p.get_address1() 

 

wep_decoder = Dot11WEPDecoder(self.key_manager) 

wep_decoder.set_bssid(bssid) 

packet = wep_decoder.decode(p.body_string) 

549 ↛ 550line 549 didn't jump to line 550, because the condition on line 549 was never true if packet is None: 

wpa_decoder = Dot11WPADecoder() 

packet = wpa_decoder.decode(p.body_string) 

if packet is None: 

wpa2_decoder = Dot11WPA2Decoder() 

packet = wpa2_decoder.decode(p.body_string) 

if packet is None: 

data_decoder = DataDecoder() 

packet = data_decoder.decode(p.body_string) 

 

p.contains(packet) 

return p 

 

class Dot11WEPDecoder(BaseDot11Decoder): 

def __init__(self, key_manager): 

BaseDot11Decoder.__init__(self, key_manager) 

self.bssid = None 

 

def set_bssid(self, bssid): 

self.bssid = bssid 

 

def decode(self, aBuffer): 

wep = dot11.Dot11WEP(aBuffer) 

self.set_decoded_protocol( wep ) 

 

574 ↛ 575line 574 didn't jump to line 575, because the condition on line 574 was never true if wep.is_WEP() is False: 

return None 

 

key = self.find_key(self.bssid) 

if key: 

decoded_string=wep.get_decrypted_data(key) 

 

wep_data = Dot11WEPDataDecoder() 

packet = wep_data.decode(decoded_string) 

else: 

data_decoder = DataDecoder() 

packet = data_decoder.decode(wep.body_string) 

 

wep.contains(packet) 

 

return wep 

 

class Dot11WEPDataDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

wep_data = dot11.Dot11WEPData(aBuffer) 

 

if not wep_data.check_icv(): 

# TODO: Do something when the icv is not correct 

pass 

 

self.set_decoded_protocol( wep_data ) 

 

llc_decoder = LLCDecoder() 

packet = llc_decoder.decode(wep_data.body_string) 

 

wep_data.contains(packet) 

 

return wep_data 

 

 

class Dot11WPADecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer, key=None): 

wpa = dot11.Dot11WPA(aBuffer) 

self.set_decoded_protocol( wpa ) 

 

if wpa.is_WPA() is False: 

return None 

 

if key: 

decoded_string=wpa.get_decrypted_data() 

 

wpa_data = Dot11WPADataDecoder() 

packet = wpa_data.decode(decoded_string) 

else: 

data_decoder = DataDecoder() 

packet = data_decoder.decode(wpa.body_string) 

 

wpa.contains(packet) 

 

return wpa 

 

class Dot11WPADataDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

wpa_data = dot11.Dot11WPAData(aBuffer) 

self.set_decoded_protocol( wpa_data ) 

 

llc_decoder = LLCDecoder() 

packet = self.llc_decoder.decode(wpa_data.body_string) 

 

wpa_data.contains(packet) 

 

return wpa_data 

 

class Dot11WPA2Decoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer, key=None): 

wpa2 = dot11.Dot11WPA2(aBuffer) 

self.set_decoded_protocol( wpa2 ) 

 

if wpa2.is_WPA2() is False: 

return None 

 

if key: 

decoded_string=wpa2.get_decrypted_data() 

 

wpa2_data = Dot11WPA2DataDecoder() 

packet = wpa2_data.decode(decoded_string) 

else: 

data_decoder = DataDecoder() 

packet = data_decoder.decode(wpa2.body_string) 

 

wpa2.contains(packet) 

 

return wpa2 

 

class Dot11WPA2DataDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

wpa2_data = dot11.Dot11WPA2Data(aBuffer) 

self.set_decoded_protocol( wpa2_data ) 

 

llc_decoder = LLCDecoder() 

packet = self.llc_decoder.decode(wpa2_data.body_string) 

 

wpa2_data.contains(packet) 

 

return wpa2_data 

 

class LLCDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

d = dot11.LLC(aBuffer) 

self.set_decoded_protocol( d ) 

 

698 ↛ 707line 698 didn't jump to line 707, because the condition on line 698 was never false if d.get_DSAP()==dot11.SAPTypes.SNAP: 

699 ↛ 707line 699 didn't jump to line 707, because the condition on line 699 was never false if d.get_SSAP()==dot11.SAPTypes.SNAP: 

700 ↛ 707line 700 didn't jump to line 707, because the condition on line 700 was never false if d.get_control()==dot11.LLC.DLC_UNNUMBERED_FRAMES: 

snap_decoder = SNAPDecoder() 

packet = snap_decoder.decode(d.body_string) 

d.contains(packet) 

return d 

 

# Only SNAP is implemented 

data_decoder = DataDecoder() 

packet = data_decoder.decode(d.body_string) 

d.contains(packet) 

return d 

 

class SNAPDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

s = dot11.SNAP(aBuffer) 

self.set_decoded_protocol( s ) 

719 ↛ 720line 719 didn't jump to line 720, because the condition on line 719 was never true if s.get_OUI()==CDP.OUI and s.get_protoID()==CDP.Type: 

dec = CDPDecoder() 

packet = dec.decode(s.body_string) 

722 ↛ 724line 722 didn't jump to line 724, because the condition on line 722 was never true elif s.get_OUI()!=0x000000: 

# We don't know how to handle other than OUI=0x000000 (EtherType) 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(s.body_string) 

elif s.get_protoID() == ImpactPacket.IP.ethertype: 

self.ip_decoder = IPDecoder() 

packet = self.ip_decoder.decode(s.body_string) 

729 ↛ 732line 729 didn't jump to line 732, because the condition on line 729 was never false elif s.get_protoID() == ImpactPacket.ARP.ethertype: 

self.arp_decoder = ARPDecoder() 

packet = self.arp_decoder.decode(s.body_string) 

elif s.get_protoID() == eap.DOT1X_AUTHENTICATION: 

self.eapol_decoder = EAPOLDecoder() 

packet = self.eapol_decoder.decode(s.body_string) 

else: 

self.data_decoder = DataDecoder() 

packet = self.data_decoder.decode(s.body_string) 

 

s.contains(packet) 

return s 

 

class CDPDecoder(Decoder): 

 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

s = CDP(aBuffer) 

self.set_decoded_protocol( s ) 

return s 

 

class Dot11ManagementDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

self.subtype = None 

 

def set_subtype(self, subtype): 

self.subtype=subtype 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementFrame(aBuffer) 

self.set_decoded_protocol( p ) 

 

if self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_BEACON: 

self.mgt_beacon_decoder = Dot11ManagementBeaconDecoder() 

packet = self.mgt_beacon_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_PROBE_REQUEST: 

self.mgt_probe_request_decoder = Dot11ManagementProbeRequestDecoder() 

packet = self.mgt_probe_request_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_PROBE_RESPONSE: 

self.mgt_probe_response_decoder = Dot11ManagementProbeResponseDecoder() 

packet = self.mgt_probe_response_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_DEAUTHENTICATION: 

self.mgt_deauthentication_decoder = Dot11ManagementDeauthenticationDecoder() 

packet = self.mgt_deauthentication_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_AUTHENTICATION: 

self.mgt_Authentication_decoder = Dot11ManagementAuthenticationDecoder() 

packet = self.mgt_Authentication_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_DISASSOCIATION: 

self.mgt_disassociation_decoder = Dot11ManagementDisassociationDecoder() 

packet = self.mgt_disassociation_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_ASSOCIATION_REQUEST: 

self.mgt_association_request_decoder = Dot11ManagementAssociationRequestDecoder() 

packet = self.mgt_association_request_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_ASSOCIATION_RESPONSE: 

self.mgt_association_response_decoder = Dot11ManagementAssociationResponseDecoder() 

packet = self.mgt_association_response_decoder.decode(p.body_string) 

elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_REASSOCIATION_REQUEST: 

self.mgt_reassociation_request_decoder = Dot11ManagementReassociationRequestDecoder() 

packet = self.mgt_reassociation_request_decoder.decode(p.body_string) 

791 ↛ 795line 791 didn't jump to line 795, because the condition on line 791 was never false elif self.subtype is dot11.Dot11Types.DOT11_SUBTYPE_MANAGEMENT_REASSOCIATION_RESPONSE: 

self.mgt_reassociation_response_decoder = Dot11ManagementReassociationResponseDecoder() 

packet = self.mgt_reassociation_response_decoder.decode(p.body_string) 

else: 

data_decoder = DataDecoder() 

packet = data_decoder.decode(p.body_string) 

 

p.contains(packet) 

return p 

 

class Dot11ManagementBeaconDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementBeacon(aBuffer) 

self.set_decoded_protocol( p ) 

 

return p 

 

class Dot11ManagementProbeRequestDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementProbeRequest(aBuffer) 

self.set_decoded_protocol( p ) 

 

return p 

 

class Dot11ManagementProbeResponseDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementProbeResponse(aBuffer) 

self.set_decoded_protocol( p ) 

 

return p 

 

class Dot11ManagementDeauthenticationDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementDeauthentication(aBuffer) 

self.set_decoded_protocol( p ) 

 

return p 

 

class Dot11ManagementAuthenticationDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementAuthentication(aBuffer) 

self.set_decoded_protocol(p) 

 

return p 

 

class Dot11ManagementDisassociationDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementDisassociation(aBuffer) 

self.set_decoded_protocol(p) 

 

return p 

 

class Dot11ManagementAssociationRequestDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementAssociationRequest(aBuffer) 

self.set_decoded_protocol(p) 

 

return p 

 

class Dot11ManagementAssociationResponseDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementAssociationResponse(aBuffer) 

self.set_decoded_protocol(p) 

 

return p 

 

class Dot11ManagementReassociationRequestDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementReassociationRequest(aBuffer) 

self.set_decoded_protocol(p) 

 

return p 

 

class Dot11ManagementReassociationResponseDecoder(BaseDot11Decoder): 

def __init__(self): 

BaseDot11Decoder.__init__(self) 

 

def decode(self, aBuffer): 

p = dot11.Dot11ManagementReassociationResponse(aBuffer) 

self.set_decoded_protocol(p) 

 

return p 

 

class BaseDecoder(Decoder): 

 

def decode(self, buff): 

 

packet = self.klass(buff) 

self.set_decoded_protocol(packet) 

cd = self.child_decoders.get(self.child_key(packet), DataDecoder()) 

packet.contains(cd.decode(packet.get_body_as_string())) 

return packet 

 

class SimpleConfigDecoder(BaseDecoder): 

 

child_decoders = {} 

klass = wps.SimpleConfig 

915 ↛ exitline 915 didn't run the lambda on line 915 child_key = lambda s,p: None 

 

def decode(self, buff): 

sc = BaseDecoder.decode(self, buff) 

ary = array.array('B', sc.child().get_packet()) 

sc.unlink_child() 

tlv = wps.SimpleConfig.build_tlv_container() 

tlv.from_ary(ary) 

sc.contains(tlv) 

 

return sc 

 

class EAPExpandedDecoder(BaseDecoder): 

child_decoders = { 

(eap.EAPExpanded.WFA_SMI, eap.EAPExpanded.SIMPLE_CONFIG): SimpleConfigDecoder(), 

} 

klass = eap.EAPExpanded 

932 ↛ exitline 932 didn't run the lambda on line 932 child_key = lambda s,p: (p.get_vendor_id(), p.get_vendor_type()) 

 

class EAPRDecoder(BaseDecoder): 

child_decoders = { 

eap.EAPR.EXPANDED:EAPExpandedDecoder() 

} 

klass = eap.EAPR 

939 ↛ exitline 939 didn't run the lambda on line 939 child_key = lambda s, p: p.get_type() 

 

class EAPDecoder(BaseDecoder): 

child_decoders = { 

eap.EAP.REQUEST: EAPRDecoder(), 

eap.EAP.RESPONSE: EAPRDecoder(), 

} 

klass = eap.EAP 

947 ↛ exitline 947 didn't run the lambda on line 947 child_key = lambda s, p: p.get_code() 

 

class EAPOLDecoder(BaseDecoder): 

child_decoders = { 

eap.EAPOL.EAP_PACKET: EAPDecoder() 

} 

klass = eap.EAPOL 

954 ↛ exitline 954 didn't run the lambda on line 954 child_key = lambda s, p: p.get_packet_type() 

 

class BootpDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

d = dhcp.BootpPacket(aBuffer) 

self.set_decoded_protocol( d ) 

off = len(d.getData()) 

if dhcp.DhcpPacket(aBuffer[off:])['cookie'] == dhcp.DhcpPacket.MAGIC_NUMBER: 

self.data_decoder = DHCPDecoder() 

packet = self.data_decoder.decode(aBuffer[off:]) 

d.contains(packet) 

return d 

 

class DHCPDecoder(Decoder): 

def __init__(self): 

pass 

 

def decode(self, aBuffer): 

d = dhcp.DhcpPacket(aBuffer) 

self.set_decoded_protocol( d ) 

return d