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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. 

# 

 

from impacket import structure 

from impacket.ImpactPacket import ProtocolPacket 

 

class BootpPacket(ProtocolPacket, structure.Structure): 

commonHdr = ( 

('op','b'), 

('htype','b=1'), # 1 = Ether 

('hlen','b=len(chaddr)'), 

('hops','b=0'), 

('xid','!L=0'), 

('secs','!H=0'), 

('flags','!H=0'), 

('ciaddr','!L=0'), 

('yiaddr','!L=0'), 

('siaddr','!L=0'), 

('giaddr','!L=0'), 

('_chaddr','16s=chaddr'), 

('chaddr','_','_chaddr[:hlen]'), 

('sname','64s=""'), 

('file','128s=""')) 

 

def __init__(self, data = None, alignment = 0): 

structure.Structure.__init__(self, data, alignment) 

 

class DhcpPacket(ProtocolPacket, structure.Structure): 

# DHCP: https://www.ietf.org/rfc/rfc2131.txt 

# DHCP Options: https://www.ietf.org/rfc/rfc1533.txt 

# good list of options: http://www.networksorcery.com/enp/protocol/bootp/options.htm 

MAGIC_NUMBER = 0x63825363 

BOOTREQUEST = 1 

BOOTREPLY = 2 

 

DHCPDISCOVER= 1 

DHCPOFFER = 2 

DHCPREQUEST = 3 

DHCPDECLINE = 4 

DHCPACK = 5 

DHCPNAK = 6 

DHCPRELEASE = 7 

DHCPINFORM = 8 

 

options = { 

# 3. Vendor Extensions 

'pad':(0,'_'), 

'subnet-mask':(1,'!L'), 

'time-offset':(2,'!L'), 

'router':(3,'*!L'), 

'time-server':(4,'*!L'), 

'name-server':(5,'*!L'), 

'domain-name-server':(6,'*!L'), 

'log-server':(7,'*!L'), 

'cookie-server':(8,'*!L'), 

'lpr-server':(9,'*!L'), 

'impress-server':(10,'*!L'), 

'resource-locator-server':(11,'*!L'), 

'host-name':(12,':'), 

'boot-file-size':(13,'!H'), 

'merit-dump-file':(14,':'), 

'domain-name':(15,':'), 

'swap-server':(16,':'), 

'root-path':(17,':'), 

'extensions-path':(18,':'), 

 

# 4. IP Layer Parameters per Host 

'ip-forwarding':(19,'B'), 

'non-local-source-routing':(20,'B'), 

'policy-filter':(21,'*!L'), 

'maximum-datagram-reassembly-size':(22,'!H'), 

'default-ip-ttl':(23,'B'), 

'path-mtu-aging-timeout':(24,'!L'), 

'path-mtu-plateau-table':(25,'*!H'), 

 

# 5. IP Layer Parameters per Interface 

'interface-mtu':(26,'!H'), 

'all-subnets-are-local':(27,'B'), 

'broadcast-address':(28,'!L'), 

'perform-mask-discovery':(29,'B'), 

'mask-supplier':(30,'B'), 

'perform-router-discovery':(31,'B'), 

'router-solicitation-address':(32,'!L'), 

'static-route':(33,'*!L'), 

 

# 6. Link Layer Parameters per Interface 

'trailer-encapsulation':(34,'B'), 

'arp-cache-timeout':(35,'!L'), 

'ethernet-encapsulation':(36,'B'), 

 

# 7. TCP parameters 

'tcp-default-ttl':(37,'B'), 

'tcp-keepalive-interval':(38,'!L'), 

'tcp-keepalive-garbage':(39,'B'), 

 

# 8. Application and Service parameters 

'nis-domain':(40,':'), 

'nis-servers':(41,'*!L'), 

'ntp-servers':(42,'*!L'), 

'vendor-specific':(43,':'), 

'netbios-name-server':(44,'*!L'), 

'netbios-datagrame-distribution-server':(45,'*!L'), 

'netbios-node-type':(46,'B'), 

'netbios-scope':(47,':'), 

'x11-font-server':(48,'*!L'), 

'x11-display-manager':(49,'*!L'), 

 

 

# 9. DHCP Extensions 

'requested-ip':(50,'!L'), 

'lease-time':(51,'!L'), 

'option-overload':(52,'B'), 

'message-type':(53,'B'), 

'server-id':(54,'!L'), 

'parameter-request-list':(55,':'), 

'message':(56,':'), 

'maximum-dhcp-message-size':(57,'!H'), 

'renewal-time':(58,'!L'), 

'rebinding-time':(59,'!L'), 

'vendor-class':(60,':'), 

'client-id':(61,':'), 

 

# other non-rfc1533 options 

'slp-directory-agent':(78,':'), # https://www.ietf.org/rfc/rfc2610.txt 

'slp-service-scope':(79,':'), # https://www.ietf.org/rfc/rfc2610.txt 

'fully-qualified-domain-name':(81,':'), # https://www.ietf.org/rfc/rfc4702.txt 

'default-url': (114, ':'), # text (URL) - not defined in any RFC but assigned by IANA 

'auto-configuration':(116,'B'), # https://www.ietf.org/rfc/rfc2563.txt 

'domain-search-list':(119,':'), # https://www.ietf.org/rfc/rfc3397.txt 

'classless-route-121':(121, ':'), # https://www.ietf.org/rfc/rfc3442.txt 

'classless-route-249':(249, ':'), # https://web.archive.org/web/20140205135249/support.microsoft.com/kb/121005 

'proxy-autoconfig':(252,':'), 

'eof':(255,'_'), 

} 

 

structure = ( 

('cookie','!L'), 

('_options',':=self.packOptions(options)'), 

('options','_','self.unpackOptions(_options)')) 

 

def __init__(self, data = None, alignment = 0): 

structure.Structure.__init__(self, data, alignment) 

 

def packOptions(self, options): 

# options is an array of tuples: ('name',value) 

 

answer = '' 

for name, value in options: 

code,format = self.options[name] 

val = self.pack(format, value) 

answer += '%c%c%s' % (code, len(val), val) 

 

return answer 

 

def getOptionNameAndFormat(self, optionCode): 

for k in self.options: 

code,format = self.options[k] 

if code == optionCode: return k, format 

return optionCode, ':' 

 

def unpackOptions(self, options): 

# options is a string 

 

# print '%r' % options 

answer = [] 

i = 0 

while i < len(options)-1: 

name, format = self.getOptionNameAndFormat(ord(options[i])) 

# size = self.calcUnpackSize(format, options[i+1:]) 

size = ord(options[i+1]) 

# print i, name, format, size 

value = self.unpack(format, options[i+2:i+2+size]) 

answer.append((name, value)) 

i += 2+size 

 

return answer 

 

def unpackParameterRequestList(self, options): 

return [self.getOptionNameAndFormat(ord(opt))[0] for opt in options] 

 

def isAskingForProxyAutodiscovery(self): 

for opt in self.fields['options']: 

if opt[0] == 'parameter-request-list': 

for optCode in opt[1]: 

if ord(optCode) == 252: 

return True 

return False 

 

def getOptionValue(self, name): 

for opt in self.fields['options']: 

if opt[0] == name: 

return opt[1] 

return None