/usr/lib/python2.7/dist-packages/impacket/ldap/ldap.py is in python-impacket 0.9.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This software is provided under under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# Author: Alberto Solino (@agsolino)
#
# Description:
# RFC 4511 Minimalistic implementation. We don't need much functionality yet
# If we need more complex use cases we might opt to use a third party implementation
# Keep in mind the APIs are still unstable, might require to re-write your scripts
# as we change them.
# Adding [MS-ADTS] specific functionality
#
# ToDo:
# [ ] Implement Paging Search, especially important for big requests
#
import socket
import os
from binascii import unhexlify
from pyasn1.codec.der import decoder, encoder
from pyasn1.error import SubstrateUnderrunError
from impacket import LOG
from impacket.ldap.ldapasn1 import BindRequest, Integer7Bit, LDAPDN, AuthenticationChoice, AuthSimple, LDAPMessage, \
SCOPE_SUB, SearchRequest, Scope, DEREF_NEVER, DeRefAliases, IntegerPositive, Boolean, AttributeSelection, \
SaslCredentials, LDAPString, ProtocolOp, Credentials
from impacket.ntlm import getNTLMSSPType1, getNTLMSSPType3
from impacket.spnego import SPNEGO_NegTokenInit, TypesMech
try:
import OpenSSL
from OpenSSL import SSL, crypto
except:
LOG.critical("pyOpenSSL is not installed, can't continue")
raise
class LDAPConnection:
def __init__(self,url, baseDN='dc=net', dstIp = None):
"""
LDAPConnection class
:param string url:
:param string baseDN:
:param string dstIp:
:return: a LDAP instance, if not raises a LDAPSessionError exception
"""
self._SSL = False
self._dstPort = 0
self._dstHost = 0
self._socket = None
self._baseDN = baseDN
self._messageId = 1
self._dstIp = dstIp
if url.startswith("ldap://"):
self._dstPort = 389
self._SSL = False
self._dstHost = url[7:]
elif url.startswith("ldaps://"):
#raise LDAPSessionError(errorString = 'LDAPS still not supported')
self._dstPort = 636
self._SSL = True
self._dstHost = url[8:]
else:
raise LDAPSessionError(errorString = 'Unknown URL prefix %s' % url)
# Try to connect
if self._dstIp is not None:
targetHost = self._dstIp
else:
targetHost = self._dstHost
LOG.debug('Connecting to %s, port %s, SSL %s' % (targetHost, self._dstPort, self._SSL))
try:
af, socktype, proto, canonname, sa = socket.getaddrinfo(targetHost, self._dstPort, 0, socket.SOCK_STREAM)[0]
self._socket = socket.socket(af, socktype, proto)
except socket.error, e:
raise socket.error("Connection error (%s:%s)" % (targetHost, 88), e)
if self._SSL is False:
self._socket.connect(sa)
else:
# Switching to TLS now
ctx = SSL.Context(SSL.TLSv1_METHOD)
#ctx.set_cipher_list('RC4')
self._socket = SSL.Connection(ctx, self._socket)
self._socket.connect(sa)
self._socket.do_handshake()
def kerberosLogin(self, user, password, domain='', lmhash='', nthash='', aesKey='', kdcHost=None, TGT=None,
TGS=None, useCache=True):
"""
logins into the target system explicitly using Kerberos. Hashes are used if RC4_HMAC is supported.
:param string user: username
:param string password: password for the user
:param string domain: domain where the account is valid for (required)
:param string lmhash: LMHASH used to authenticate using hashes (password is not used)
:param string nthash: NTHASH used to authenticate using hashes (password is not used)
:param string aesKey: aes256-cts-hmac-sha1-96 or aes128-cts-hmac-sha1-96 used for Kerberos authentication
:param string kdcHost: hostname or IP Address for the KDC. If None, the domain will be used (it needs to resolve tho)
:param struct TGT: If there's a TGT available, send the structure here and it will be used
:param struct TGS: same for TGS. See smb3.py for the format
:param bool useCache: whether or not we should use the ccache for credentials lookup. If TGT or TGS are specified this is False
:return: True, raises a LDAPSessionError if error.
"""
if lmhash != '' or nthash != '':
if len(lmhash) % 2: lmhash = '0%s' % lmhash
if len(nthash) % 2: nthash = '0%s' % nthash
try: # just in case they were converted already
lmhash = unhexlify(lmhash)
nthash = unhexlify(nthash)
except:
pass
# Importing down here so pyasn1 is not required if kerberos is not used.
from impacket.krb5.ccache import CCache
from impacket.krb5.asn1 import AP_REQ, Authenticator, TGS_REP, seq_set
from impacket.krb5.kerberosv5 import getKerberosTGT, getKerberosTGS
from impacket.krb5 import constants
from impacket.krb5.types import Principal, KerberosTime, Ticket
from pyasn1.codec.der import decoder, encoder
import datetime
if TGT is not None or TGS is not None:
useCache = False
if useCache is True:
try:
ccache = CCache.loadFile(os.getenv('KRB5CCNAME'))
except:
# No cache present
pass
else:
# retrieve user and domain information from CCache file if needed
if user == '' and len(ccache.principal.components) > 0:
user = ccache.principal.components[0]['data']
if domain == '':
domain = ccache.principal.realm['data']
LOG.debug("Using Kerberos Cache: %s" % os.getenv('KRB5CCNAME'))
principal = 'ldap/%s@%s' % (self._dstHost.upper(), domain.upper())
creds = ccache.getCredential(principal)
if creds is None:
# Let's try for the TGT and go from there
principal = 'krbtgt/%s@%s' % (domain.upper(), domain.upper())
creds = ccache.getCredential(principal)
if creds is not None:
TGT = creds.toTGT()
LOG.debug('Using TGT from cache')
else:
LOG.debug("No valid credentials found in cache. ")
else:
TGS = creds.toTGS()
LOG.debug('Using TGS from cache')
# First of all, we need to get a TGT for the user
userName = Principal(user, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
if TGT is None:
if TGS is None:
tgt, cipher, oldSessionKey, sessionKey = getKerberosTGT(userName, password, domain, lmhash, nthash,
aesKey, kdcHost)
else:
tgt = TGT['KDC_REP']
cipher = TGT['cipher']
sessionKey = TGT['sessionKey']
if TGS is None:
serverName = Principal('ldap/%s' % self._dstHost,
type=constants.PrincipalNameType.NT_SRV_INST.value)
tgs, cipher, oldSessionKey, sessionKey = getKerberosTGS(serverName, domain, kdcHost, tgt, cipher,
sessionKey)
else:
tgs = TGS['KDC_REP']
cipher = TGS['cipher']
sessionKey = TGS['sessionKey']
# Let's build a NegTokenInit with a Kerberos REQ_AP
blob = SPNEGO_NegTokenInit()
# Kerberos
blob['MechTypes'] = [TypesMech['MS KRB5 - Microsoft Kerberos 5']]
# Let's extract the ticket from the TGS
tgs = decoder.decode(tgs, asn1Spec=TGS_REP())[0]
ticket = Ticket()
ticket.from_asn1(tgs['ticket'])
# Now let's build the AP_REQ
apReq = AP_REQ()
apReq['pvno'] = 5
apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)
opts = list()
apReq['ap-options'] = constants.encodeFlags(opts)
seq_set(apReq, 'ticket', ticket.to_asn1)
authenticator = Authenticator()
authenticator['authenticator-vno'] = 5
authenticator['crealm'] = domain
seq_set(authenticator, 'cname', userName.components_to_asn1)
now = datetime.datetime.utcnow()
authenticator['cusec'] = now.microsecond
authenticator['ctime'] = KerberosTime.to_asn1(now)
encodedAuthenticator = encoder.encode(authenticator)
# Key Usage 11
# AP-REQ Authenticator (includes application authenticator
# subkey), encrypted with the application session key
# (Section 5.5.1)
encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 11, encodedAuthenticator, None)
apReq['authenticator'] = None
apReq['authenticator']['etype'] = cipher.enctype
apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator
blob['MechToken'] = encoder.encode(apReq)
# Done with the Kerberos saga, now let's get into LDAP
bindRequest = BindRequest()
bindRequest['version'] = Integer7Bit(3)
bindRequest['name'] = LDAPDN(user)
credentials = SaslCredentials()
credentials['mechanism'] = LDAPString('GSS-SPNEGO')
credentials['credentials'] = Credentials(blob.getData())
bindRequest['authentication'] = AuthenticationChoice().setComponentByName('sasl', credentials)
resp = self.sendReceive('bindRequest', bindRequest)[0]['protocolOp']
if resp['bindResponse']['resultCode'] != 0:
raise LDAPSessionError(errorString='Error in bindRequest -> %s:%s' % (
resp['bindResponse']['resultCode'].prettyPrint(), resp['bindResponse']['diagnosticMessage']))
return True
def login(self, user='', password='', domain = '', lmhash = '', nthash = '', authenticationChoice = 'sicilyNegotiate'):
"""
logins into the target system
:param string user: username
:param string password: password for the user
:param string domain: domain where the account is valid for
:param string lmhash: LMHASH used to authenticate using hashes (password is not used)
:param string nthash: NTHASH used to authenticate using hashes (password is not used)
:param string authenticationChoice: type of authentication protocol to use (default NTLM)
:return: True, raises a LDAPSessionError if error.
"""
bindRequest = BindRequest()
bindRequest['version'] = Integer7Bit(3)
bindRequest['name'] = LDAPDN(user)
if authenticationChoice == 'simple':
bindRequest['authentication'] = AuthenticationChoice().setComponentByName(authenticationChoice, AuthSimple(password))
resp = self.sendReceive('bindRequest', bindRequest)[0]['protocolOp']
elif authenticationChoice == 'sicilyPackageDiscovery':
bindRequest['authentication'] = AuthenticationChoice().setComponentByName(authenticationChoice, '')
resp = self.sendReceive('bindRequest', bindRequest)[0]['protocolOp']
elif authenticationChoice == 'sicilyNegotiate':
# Deal with NTLM Authentication
if lmhash != '' or nthash != '':
if len(lmhash) % 2: lmhash = '0%s' % lmhash
if len(nthash) % 2: nthash = '0%s' % nthash
try: # just in case they were converted already
lmhash = unhexlify(lmhash)
nthash = unhexlify(nthash)
except:
pass
# NTLM Negotiate
negotiate = getNTLMSSPType1('',domain)
bindRequest['authentication'] = AuthenticationChoice().setComponentByName('sicilyNegotiate', negotiate)
resp = self.sendReceive('bindRequest', bindRequest)[0]['protocolOp']
# NTLM Challenge
type2 = resp['bindResponse']['matchedDN']
# NTLM Auth
type3, exportedSessionKey = getNTLMSSPType3(negotiate, str(type2), user, password, domain, lmhash, nthash)
bindRequest['authentication'] = AuthenticationChoice().setComponentByName('sicilyResponse', type3)
resp = self.sendReceive('bindRequest', bindRequest)[0]['protocolOp']
else:
raise LDAPSessionError(errorString='Unknown authenticationChoice %s' % authenticationChoice)
if resp['bindResponse']['resultCode'] != 0:
raise LDAPSessionError(errorString = 'Error in bindRequest -> %s:%s' % (resp['bindResponse']['resultCode'].prettyPrint(), resp['bindResponse']['diagnosticMessage'] ))
return True
def search(self, searchBase=None, searchFilter=None, scope=SCOPE_SUB, attributes=None, derefAliases=DEREF_NEVER,
sizeLimit=0):
# ToDo: For now we need to specify a filter as a Filter instance, meaning, we have to programmatically build it
# ToDo: We have to create functions to parse and compile a text searchFilter into a Filter instance.
if searchBase is None:
searchBase = self._baseDN
searchRequest = SearchRequest()
searchRequest['baseObject'] = LDAPDN(searchBase)
searchRequest['scope'] = Scope(scope)
searchRequest['derefAliases'] = DeRefAliases(derefAliases)
searchRequest['sizeLimit'] = IntegerPositive(sizeLimit)
searchRequest['timeLimit'] = IntegerPositive(0)
searchRequest['typesOnly'] = Boolean(False)
searchRequest['filter'] = searchFilter
searchRequest['attributes'] = AttributeSelection()
if attributes is not None:
for i,item in enumerate(attributes):
searchRequest['attributes'][i] = item
done = False
answers = []
# We keep asking records until we get a searchResDone packet
while not done:
resp = self.sendReceive('searchRequest', searchRequest)
for item in resp:
protocolOp = item['protocolOp']
if protocolOp.getName() == 'searchResDone':
done = True
if protocolOp['searchResDone']['resultCode'] != 0:
raise LDAPSearchError(error = int(protocolOp['searchResDone']['resultCode']), errorString = 'Error in searchRequest -> %s:%s' % (protocolOp['searchResDone']['resultCode'].prettyPrint(), protocolOp['searchResDone']['diagnosticMessage'] ), answers=answers)
else:
answers.append(item['protocolOp'][protocolOp.getName()])
return answers
def close(self):
if self._socket is not None:
self._socket.close()
def send(self, protocolOp, message):
ldapMessage = LDAPMessage( )
ldapMessage['messageID'] = IntegerPositive(self._messageId)
ldapMessage['protocolOp'] = ProtocolOp().setComponentByName(protocolOp, message)
data = encoder.encode(ldapMessage)
return self._socket.sendall(data)
def recv(self):
REQUEST_SIZE = 8192
data = ''
done = False
while not done:
recvData = self._socket.recv(REQUEST_SIZE)
if len(recvData) < REQUEST_SIZE:
done = True
data += recvData
answers = []
while len(data) > 0:
try:
ldapMessage, remaining = decoder.decode(data, asn1Spec = LDAPMessage())
except SubstrateUnderrunError:
# We need more data
remaining = data + self._socket.recv(REQUEST_SIZE)
else:
answers.append(ldapMessage)
data = remaining
self._messageId += 1
return answers
def sendReceive(self, protocolOp, message):
self.send(protocolOp, message)
return self.recv()
class LDAPSessionError(Exception):
"""
This is the exception every client should catch
"""
def __init__( self, error = 0, packet=0, errorString=''):
Exception.__init__(self)
self.error = error
self.packet = packet
self.errorString = errorString
def getErrorCode( self ):
return self.error
def getErrorPacket( self ):
return self.packet
def getErrorString( self ):
return self.errorString
def __str__( self ):
return self.errorString
class LDAPSearchError(LDAPSessionError):
def __init__( self, error = 0, packet=0, errorString='', answers = []):
LDAPSessionError.__init__(self, error, packet, errorString)
self.answers = answers
def getAnswers( self ):
return self.answers
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