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#
# Copyright 2016-present Ciena Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import sys, os
from EapolAAA import *
from enum import *
import noseTlsAuthHolder as tlsAuthHolder
from scapy_ssl_tls.ssl_tls import *
from scapy_ssl_tls.ssl_tls_crypto import *
from tls_cert import Key
from socket import *
import struct
import scapy
from nose.tools import *
from CordTestBase import CordTester
import re
log.setLevel('INFO')
def bytes_to_num(data):
return int(data.encode('hex'), 16)
class TLSAuthTest(EapolPacket, CordTester):
tlsStateTable = Enumeration("TLSStateTable", ("ST_EAP_SETUP",
"ST_EAP_START",
"ST_EAP_ID_REQ",
"ST_EAP_TLS_HELLO_REQ",
"ST_EAP_TLS_CERT_REQ",
"ST_EAP_TLS_CHANGE_CIPHER_SPEC",
"ST_EAP_TLS_FINISHED",
"ST_EAP_TLS_DONE"
)
)
tlsEventTable = Enumeration("TLSEventTable", ("EVT_EAP_SETUP",
"EVT_EAP_START",
"EVT_EAP_ID_REQ",
"EVT_EAP_TLS_HELLO_REQ",
"EVT_EAP_TLS_CERT_REQ",
"EVT_EAP_TLS_CHANGE_CIPHER_SPEC",
"EVT_EAP_TLS_FINISHED",
"EVT_EAP_TLS_DONE"
)
)
server_hello_done_signature = '\x0e\x00\x00\x00'
SERVER_HELLO = '\x02'
SERVER_CERTIFICATE = '\x0b'
CERTIFICATE_REQUEST = '\x0d'
SERVER_HELLO_DONE = '\x0e'
SERVER_UNKNOWN = '\xff'
HANDSHAKE = '\x16'
CHANGE_CIPHER = '\x14'
TLS_OFFSET = 28
HDR_IDX = 0
DATA_IDX = 1
CB_IDX = 2
CLIENT_CERT = """-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----"""
CLIENT_PRIV_KEY = """-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----"""
def handle_server_hello_done(self, server_hello_done):
if server_hello_done[-4:] == self.server_hello_done_signature:
self.server_hello_done_received = True
def __init__(self, intf = 'veth0', client_cert = None, client_priv_key = None, fail_cb = None):
self.fsmTable = tlsAuthHolder.initTlsAuthHolderFsmTable(self, self.tlsStateTable, self.tlsEventTable)
EapolPacket.__init__(self, intf)
CordTester.__init__(self, self.fsmTable, self.tlsStateTable.ST_EAP_TLS_DONE)
#self.tlsStateTable, self.tlsEventTable)
self.currentState = self.tlsStateTable.ST_EAP_SETUP
self.currentEvent = self.tlsEventTable.EVT_EAP_SETUP
self.nextState = None
self.nextEvent = None
self.pending_bytes = 0 #for TLS fragment reassembly
self.server_hello_done_received = False
self.send_tls_response = True
self.server_certs = []
self.pkt_last = ''
self.pkt_history = []
self.pkt_map = { self.SERVER_HELLO: ['', '', lambda pkt: pkt ],
self.SERVER_CERTIFICATE: ['', '', lambda pkt: pkt ],
self.CERTIFICATE_REQUEST: ['', '', lambda pkt: pkt ],
self.SERVER_HELLO_DONE: ['', '', self.handle_server_hello_done ],
self.SERVER_UNKNOWN: ['', '', lambda pkt: pkt ]
}
self.tls_ctx = TLSSessionCtx(client = True)
self.client_cert = self.CLIENT_CERT if client_cert is None else client_cert
self.client_priv_key = self.CLIENT_PRIV_KEY if client_priv_key is None else client_priv_key
self.failTest = False
self.fail_cb = fail_cb
def load_tls_record(self, data, pkt_type = ''):
#if pkt_type not in [ self.SERVER_HELLO_DONE, self.SERVER_UNKNOWN ]:
if pkt_type == self.SERVER_HELLO_DONE:
data = str(TLSRecord(content_type=TLSContentType.HANDSHAKE)/data)
elif pkt_type == self.CERTIFICATE_REQUEST:
data = str(TLSRecord()/TLSHandshake(type=TLSHandshakeType.CERTIFICATE_REQUEST)/data[9:])
data = None #For now ignore this record
if data:
TLS(data, ctx = self.tls_ctx)
def pkt_update(self, pkt_type, data, hdr=None, reassembled = False):
if not self.pkt_map.has_key(pkt_type):
return
if hdr is not None:
self.pkt_map[pkt_type][self.HDR_IDX] += hdr
self.pkt_map[pkt_type][self.DATA_IDX] += data
if reassembled is True:
self.pkt_map[pkt_type][self.CB_IDX](self.pkt_map[pkt_type][self.DATA_IDX])
log.info('Appending packet type %02x to packet history of len %d'
%(ord(pkt_type), len(self.pkt_map[pkt_type][self.DATA_IDX])))
self.pkt_history.append(self.pkt_map[pkt_type][self.DATA_IDX])
data = ''.join(self.pkt_map[pkt_type][:self.DATA_IDX+1])
self.load_tls_record(data, pkt_type = pkt_type)
self.pkt_map[pkt_type][self.HDR_IDX] = ''
self.pkt_map[pkt_type][self.DATA_IDX] = ''
def tlsFail(self):
##Force a failure
self.nextEvent = self.tlsEventTable.EVT_EAP_TLS_FINISHED
self.nextState = self.tlsStateTable.ST_EAP_TLS_FINISHED
self.failTest = True
def eapol_server_hello_cb(self, pkt):
'''Reassemble and send response for server hello/certificate fragments'''
r = str(pkt)
offset = self.TLS_OFFSET
tls_data = r[offset:]
type_hdrlen = 0
if self.pending_bytes > 0:
if len(tls_data) >= self.pending_bytes:
self.pkt_update(self.pkt_last, tls_data[:self.pending_bytes], reassembled = True)
offset += self.pending_bytes
self.pkt_last = ''
self.pending_bytes = 0
else:
self.pkt_update(self.pkt_last, tls_data)
self.pending_bytes -= len(tls_data)
while self.pending_bytes == 0 and offset < len(pkt):
tls_data = r[offset:]
self.pending_bytes = bytes_to_num(tls_data[3:5])
if tls_data[0] == self.HANDSHAKE:
pkt_type = tls_data[5]
if pkt_type in [ self.CERTIFICATE_REQUEST ]:
self.pending_bytes = bytes_to_num(tls_data[6:9])
type_hdrlen = 4
if len(tls_data) - 5 - type_hdrlen >= self.pending_bytes:
data_received = tls_data[5: 5 + type_hdrlen + self.pending_bytes ]
offset += 5 + type_hdrlen + self.pending_bytes
type_hdrlen = 0
self.pending_bytes = 0
self.pkt_update(pkt_type, data_received,
hdr = tls_data[:5],
reassembled = True)
else:
self.pkt_update(pkt_type, tls_data[5:],
hdr = tls_data[:5],
reassembled = False)
self.pending_bytes -= len(tls_data) - 5 - type_hdrlen
self.pkt_last = pkt_type
log.info('Pending bytes left %d' %(self.pending_bytes))
assert self.pending_bytes > 0
elif tls_data[0] == self.SERVER_HELLO_DONE:
self.pkt_update(tls_data[0], tls_data, reassembled = True)
break
else:
self.pkt_last = self.SERVER_UNKNOWN
if len(tls_data) - 5 >= self.pending_bytes:
offset += 5 + self.pending_bytes
self.pending_bytes = 0
self.pkt_last = ''
#send TLS response
if self.send_tls_response:
eap_payload = self.eapTLS(EAP_RESPONSE, pkt[EAP].id, TLS_LENGTH_INCLUDED, '')
self.eapol_send(EAPOL_EAPPACKET, eap_payload)
def _eapSetup(self):
self.setup()
self.nextEvent = self.tlsEventTable.EVT_EAP_START
def _eapStart(self):
self.eapol_start()
self.nextEvent = self.tlsEventTable.EVT_EAP_ID_REQ
def _eapIdReq(self):
log.info( 'Inside EAP ID Req' )
def eapol_cb(pkt):
log.info('Got EAPOL packet with type id and code request')
log.info('Packet code: %d, type: %d, id: %d', pkt[EAP].code, pkt[EAP].type, pkt[EAP].id)
log.info("<====== Send EAP Response with identity = %s ================>" % USER)
self.eapol_id_req(pkt[EAP].id, USER)
r = self.eapol_scapy_recv(cb = eapol_cb,
lfilter =
lambda pkt: EAP in pkt and pkt[EAP].type == EAP.TYPE_ID and pkt[EAP].code == EAP.REQUEST)
if len(r) > 0:
self.nextEvent = self.tlsEventTable.EVT_EAP_TLS_HELLO_REQ
else:
self.tlsFail()
return r
def _eapTlsHelloReq(self):
def eapol_cb(pkt):
log.info('Got hello request for id %d', pkt[EAP].id)
self.client_hello = TLSClientHello(version="TLS_1_0",
gmt_unix_time=1234,
random_bytes= '\xAB' * 28,
session_id='',
compression_methods=[TLSCompressionMethod.NULL],
cipher_suites=[TLSCipherSuite.RSA_WITH_AES_256_CBC_SHA]
)
client_hello_data = TLSHandshake()/self.client_hello
self.pkt_history.append( str(client_hello_data) )
reqdata = TLSRecord()/client_hello_data
self.load_tls_record(str(reqdata))
log.info("Sending Client Hello TLS payload of len %d, id %d" %(len(reqdata),pkt[EAP].id))
eap_payload = self.eapTLS(EAP_RESPONSE, pkt[EAP].id, TLS_LENGTH_INCLUDED, str(reqdata))
self.eapol_send(EAPOL_EAPPACKET, eap_payload)
r = self.eapol_scapy_recv(cb = eapol_cb,
lfilter =
lambda pkt: EAP in pkt and pkt[EAP].type == EAP_TYPE_TLS and pkt[EAP].code == EAP.REQUEST)
if len(r) == 0:
self.tlsFail()
return r
for i in range(2):
r = self.eapol_scapy_recv(cb = self.eapol_server_hello_cb,
lfilter =
lambda pkt: EAP in pkt and pkt[EAP].type == EAP_TYPE_TLS and pkt[EAP].code == EAP.REQUEST)
if len(r) == 0:
self.tlsFail()
return r
##send cert request when we receive the last server hello fragment
self.nextEvent = self.tlsEventTable.EVT_EAP_TLS_CERT_REQ
def get_verify_data(self):
all_handshake_pkts = ''.join(self.pkt_history)
return self.tls_ctx.get_verify_data(data = all_handshake_pkts)
def get_verify_signature(self, pem_data):
all_handshake_pkts = ''.join(self.pkt_history)
k = Key(pem_data)
signature = k.sign(all_handshake_pkts, t = 'pkcs', h = 'tls')
signature_data = '{}{}'.format(struct.pack('!H', len(signature)), signature)
return signature_data
def get_encrypted_handshake_msg(self, finish_val=''):
if not finish_val:
finish_val = self.get_verify_data()
msg = str(TLSHandshake(type=TLSHandshakeType.FINISHED)/finish_val)
crypto_container = CryptoContainer(self.tls_ctx, data = msg,
content_type = TLSContentType.HANDSHAKE)
return crypto_container.encrypt()
def get_encrypted_application_msg(self, msg = ''):
'''Needed with tunneled TLS'''
if not msg:
msg = 'test data'
return to_raw(TLSPlaintext(data = 'GET / HTTP/1.1\r\nHOST: localhost\r\n\r\n'), self.tls_ctx)
def _eapTlsCertReq(self):
def eapol_cb(pkt):
log.info('Got cert request')
self.send_tls_response = False
self.eapol_server_hello_cb(pkt)
assert self.server_hello_done_received == True
rex_pem = re.compile(r'\-+BEGIN[^\-]+\-+(.*?)\-+END[^\-]+\-+', re.DOTALL)
if self.client_cert:
der_cert = rex_pem.findall(self.client_cert)[0].decode("base64")
client_certificate_list = TLSHandshake()/TLSCertificateList(
certificates=[TLSCertificate(data=x509.X509Cert(der_cert))])
else:
client_certificate_list = TLSHandshake()/TLSCertificateList(certificates=[])
client_certificate = TLSRecord(version="TLS_1_0")/client_certificate_list
kex_data = self.tls_ctx.get_client_kex_data()
client_key_ex_data = TLSHandshake()/kex_data
client_key_ex = TLSRecord()/client_key_ex_data
if self.client_cert:
self.load_tls_record(str(client_certificate))
self.pkt_history.append(str(client_certificate_list))
self.load_tls_record(str(client_key_ex))
self.pkt_history.append(str(client_key_ex_data))
verify_signature = self.get_verify_signature(self.client_priv_key)
client_cert_verify = TLSHandshake(type=TLSHandshakeType.CERTIFICATE_VERIFY)/verify_signature
client_cert_record = TLSRecord(content_type=TLSContentType.HANDSHAKE)/client_cert_verify
self.pkt_history.append(str(client_cert_verify))
#log.info('TLS ctxt: %s' %self.tls_ctx)
client_ccs = TLSRecord(version="TLS_1_0")/TLSChangeCipherSpec()
enc_handshake_msg = self.get_encrypted_handshake_msg()
handshake_msg = str(TLSRecord(content_type=TLSContentType.HANDSHAKE)/enc_handshake_msg)
reqdata = str(TLS.from_records([client_certificate, client_key_ex, client_cert_record, client_ccs]))
reqdata += handshake_msg
log.info("------> Sending Client Hello TLS Certificate payload of len %d ----------->" %len(reqdata))
eap_payload = self.eapTLS(EAP_RESPONSE, pkt[EAP].id, TLS_LENGTH_INCLUDED, reqdata)
self.eapol_send(EAPOL_EAPPACKET, eap_payload)
r = self.eapol_scapy_recv(cb = eapol_cb,
lfilter =
lambda pkt: EAP in pkt and pkt[EAP].type == EAP_TYPE_TLS and pkt[EAP].code == EAP.REQUEST)
if len(r) > 0:
self.nextEvent = self.tlsEventTable.EVT_EAP_TLS_CHANGE_CIPHER_SPEC
else:
self.tlsFail()
return r
def _eapTlsChangeCipherSpec(self):
def eapol_cb(pkt):
r = str(pkt)
tls_data = r[self.TLS_OFFSET:]
log.info('Verifying TLS Change Cipher spec record type %x' %ord(tls_data[0]))
assert tls_data[0] == self.CHANGE_CIPHER
log.info('Handshake finished. Sending empty data')
eap_payload = self.eapTLS(EAP_RESPONSE, pkt[EAP].id, 0, '')
self.eapol_send(EAPOL_EAPPACKET, eap_payload)
r = self.eapol_scapy_recv(cb = eapol_cb,
lfilter =
lambda pkt: EAP in pkt and pkt[EAP].type == EAP_TYPE_TLS and pkt[EAP].code == EAP.REQUEST)
if len(r) > 0:
self.nextEvent = self.tlsEventTable.EVT_EAP_TLS_FINISHED
else:
self.tlsFail()
return r
def _eapTlsFinished(self):
self.nextEvent = None
def eapol_cb(pkt):
log.info('Server authentication successfull')
timeout = 5
if self.failTest is True:
if self.fail_cb is not None:
self.fail_cb()
return
timeout = None ##Wait forever on failure and force testcase timeouts
self.eapol_scapy_recv(cb = eapol_cb,
lfilter =
lambda pkt: EAP in pkt and pkt[EAP].code == EAP.SUCCESS,
timeout = timeout)
self.eapol_logoff()