| # |
| # 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. |
| # |
| #### Authentication parameters |
| from scapy.all import * |
| from scapy_ssl_tls.ssl_tls import * |
| from socket import * |
| from struct import * |
| import sys |
| from nose.tools import assert_equal, assert_not_equal, assert_raises, assert_true |
| |
| USER = "raduser" |
| PASS = "radpass" |
| WRONG_USER = "XXXX" |
| WRONG_PASS = "XXXX" |
| NO_USER = "" |
| NO_PASS = "" |
| DEV = "tap0" |
| ETHERTYPE_PAE = 0x888e |
| PAE_GROUP_ADDR = "\xff\xff\xff\xff\xff\xff" |
| EAPOL_VERSION = 1 |
| EAPOL_EAPPACKET = 0 |
| EAPOL_START = 1 |
| EAPOL_LOGOFF = 2 |
| EAPOL_KEY = 3 |
| EAPOL_ASF = 4 |
| EAP_REQUEST = 1 |
| EAP_RESPONSE = 2 |
| EAP_SUCCESS = 3 |
| EAP_FAILURE = 4 |
| EAP_TYPE_ID = 1 |
| EAP_TYPE_MD5 = 4 |
| EAP_TYPE_MSCHAP = 26 |
| EAP_TYPE_TLS = 13 |
| cCertMsg = '\x0b\x00\x00\x03\x00\x00\x00' |
| TLS_LENGTH_INCLUDED = 0x80 |
| TLS_MORE_FRAGMENTS = 0x40 |
| |
| class EapolPacket(object): |
| |
| src_mac_map = { 'bcast': 'ff:ff:ff:ff:ff:ff', |
| 'mcast': '01:80:C2:00:00:03', |
| 'zeros': '00:00:00:00:00:00', |
| 'default': None |
| } |
| |
| def __init__(self, intf = 'veth0'): |
| self.intf = intf |
| self.s = None |
| self.max_recv_size = 1600 |
| |
| def setup(self, src_mac = 'default'): |
| self.s = socket(AF_PACKET, SOCK_RAW, htons(ETHERTYPE_PAE)) |
| self.s.bind((self.intf, ETHERTYPE_PAE)) |
| self.mymac = self.s.getsockname()[4] |
| mac = None |
| if self.src_mac_map.has_key(src_mac): |
| mac = self.src_mac_map[src_mac] |
| if mac is None: |
| mac = self.mymac |
| self.llheader = Ether(dst = PAE_GROUP_ADDR, src = mac, type = ETHERTYPE_PAE) |
| log.info('llheader packet is %s'%self.llheader.show()) |
| log.info('source mac of packet is %s'%mac) |
| self.recv_sock = L2Socket(iface = self.intf, type = ETHERTYPE_PAE) |
| |
| def cleanup(self): |
| if self.s is not None: |
| self.s.close() |
| self.s = None |
| |
| def eapol(self, req_type, payload=""): |
| return EAPOL(version = EAPOL_VERSION, type = req_type)/payload |
| |
| def eap(self, code, pkt_id, req_type=0, data=""): |
| return EAP(code = code, id = pkt_id, type = req_type)/data |
| |
| def eapFragmentSend(self, code, pkt_id, flags = TLS_LENGTH_INCLUDED, payload = "", fragsize = 1024): |
| req_type = EAP_TYPE_TLS |
| if code in [ EAP_SUCCESS, EAP_FAILURE ]: |
| data = pack("!BBH", code, pkt_id, 4) |
| self.eapol_send(EAPOL_EAPPACKET, data) |
| return True |
| |
| if len(payload) <= fragsize: |
| if flags & TLS_LENGTH_INCLUDED: |
| flags_dlen = pack("!BL", flags, len(payload)) |
| data = pack("!BBHB", code, pkt_id, 5 + len(flags_dlen) + len(payload), req_type) \ |
| + flags_dlen + payload |
| self.eapol_send(EAPOL_EAPPACKET, data) |
| return True |
| flags_str = pack("!B", flags) |
| data = pack("!BBHB", code, pkt_id, 5+len(flags_str)+len(payload), req_type) + flags_str + payload |
| self.eapol_send(EAPOL_EAPPACKET, data) |
| return True |
| |
| fragments = [] |
| data = payload[:] |
| frag = 0 |
| def eapol_frag_cb(pkt): |
| r = str(pkt) |
| tls_data = r[self.TLS_OFFSET:] |
| frag_data = fragments[frag] |
| ##change packet id in response to match request |
| eap_payload = frag_data[:1] + pack("!B", pkt[EAP].id) + frag_data[2:] |
| self.eapol_send(EAPOL_EAPPACKET, eap_payload) |
| |
| while len(data) > 0: |
| data_frag = data[:fragsize] |
| data = data[fragsize:] |
| if frag == 0: |
| ##first frag, include the total length |
| flags_dlen = pack("!BL", TLS_LENGTH_INCLUDED | TLS_MORE_FRAGMENTS, len(payload)) |
| fragments.append(pack("!BBHB", code, pkt_id, 5 + len(flags_dlen) + len(data_frag), req_type) \ |
| + flags_dlen + data_frag) |
| else: |
| if len(data) > 0: |
| flags = TLS_MORE_FRAGMENTS |
| else: |
| flags = 0 |
| flags_str = pack("!B", flags) |
| fragments.append(pack("!BBHB", code, pkt_id, 5+len(flags_str)+len(data_frag), req_type) + \ |
| flags_str + data_frag) |
| frag += 1 |
| |
| frag = 0 |
| self.eapol_send(EAPOL_EAPPACKET, fragments[frag]) |
| for frag in range(len(fragments)-1): |
| frag += 1 |
| r = self.eapol_scapy_recv(cb = eapol_frag_cb, |
| lfilter = lambda pkt: EAP in pkt and pkt[EAP].type == EAP_TYPE_TLS and \ |
| pkt[EAP].code == EAP.REQUEST) |
| |
| return True |
| |
| def eapTLS(self, code, pkt_id, flags = TLS_LENGTH_INCLUDED, data=""): |
| req_type = EAP_TYPE_TLS |
| if code in [EAP_SUCCESS, EAP_FAILURE]: |
| return pack("!BBH", code, pkt_id, 4) |
| else: |
| if flags & TLS_LENGTH_INCLUDED: |
| flags_dlen = pack("!BL", flags, len(data)) |
| return pack("!BBHB", code, pkt_id, 5+len(flags_dlen)+len(data), req_type) + flags_dlen + data |
| flags_str = pack("!B", flags) |
| return pack("!BBHB", code, pkt_id, 5+len(flags_str)+len(data), req_type) + flags_str + data |
| |
| def eapTLSFragment(self, code, pkt_id, frag, data="", data_len = 0): |
| req_type = EAP_TYPE_TLS |
| if frag == 0: |
| flags = TLS_LENGTH_INCLUDED | TLS_MORE_FRAGMENTS |
| elif frag > 0: |
| flags = TLS_MORE_FRAGMENTS |
| else: |
| #last fragment |
| flags = 0 |
| if data_len == 0: |
| data_len = len(data) |
| if flags & TLS_LENGTH_INCLUDED: |
| flags_dlen = pack("!BL", flags, data_len) |
| return pack("!BBHB", code, pkt_id, 5+len(flags_dlen)+len(data), req_type) + flags_dlen + data |
| flags_str = pack("!B", flags) |
| return pack("!BBHB", code, pkt_id, 5+len(flags_str)+len(data), req_type) + flags_str + data |
| |
| def eapol_send(self, eapol_type, eap_payload): |
| return sendp(self.llheader/self.eapol(eapol_type, eap_payload), iface=self.intf) |
| |
| def eapol_recv(self): |
| p = self.s.recv(self.max_recv_size)[14:] |
| vers,pkt_type,eapollen = unpack("!BBH",p[:4]) |
| print "Version %d, type %d, len %d" %(vers, pkt_type, eapollen) |
| assert_equal(pkt_type, EAPOL_EAPPACKET) |
| return p[4:] |
| |
| def eapol_scapy_recv(self, cb = None, lfilter = None, count = 1, timeout = 5): |
| def eapol_default_cb(pkt): pass |
| if cb is None: |
| cb = eapol_default_cb |
| return sniff(prn = cb, lfilter = lfilter, count = count, timeout = timeout, opened_socket = self.recv_sock) |
| |
| def eapol_start(self): |
| eap_payload = self.eap(EAPOL_START, 2) |
| return self.eapol_send(EAPOL_START, eap_payload) |
| |
| def eapol_logoff(self): |
| eap_payload = self.eap(EAPOL_LOGOFF, 2) |
| return self.eapol_send(EAPOL_LOGOFF, eap_payload) |
| |
| def eapol_id_req(self, pkt_id = 0, user = USER): |
| eap_payload = self.eap(EAP_RESPONSE, pkt_id, EAP_TYPE_ID, user) |
| return self.eapol_send(EAPOL_EAPPACKET, eap_payload) |
| |
| def eap_md5_challenge_recv(self,rad_pwd): |
| PASS = rad_pwd |
| print 'Inside EAP MD5 Challenge Exchange' |
| p = self.s.recv(self.max_recv_size)[14:] |
| vers,pkt_type,eapollen = unpack("!BBH",p[:4]) |
| print "EAPOL Version %d, type %d, len %d" %(vers, pkt_type, eapollen) |
| code, pkt_id, eaplen = unpack("!BBH", p[4:8]) |
| print "EAP Code %d, id %d, len %d" %(code, pkt_id, eaplen) |
| assert_equal(code, EAP_REQUEST) |
| reqtype = unpack("!B", p[8:9])[0] |
| reqdata = p[9:4+eaplen] |
| print 'Request type is %d' %(reqtype) |
| assert_equal(reqtype, EAP_TYPE_MD5) |
| challenge=pack("!B",pkt_id)+PASS+reqdata[1:] |
| print "Generating md5 challenge for %s" % challenge |
| return (challenge,pkt_id) |
| |
| def eap_Status(self): |
| print 'Inside EAP Status' |
| p = self.s.recv(self.max_recv_size)[14:] |
| code, id, eaplen = unpack("!BBH", p[4:8]) |
| return code |
| |
| @classmethod |
| def eap_invalid_tls_packets_info(self, invalid_field_name = None, invalid_field_value = None): |
| log.info( 'Changing invalid field values in tls auth packets' ) |
| if invalid_field_name == 'eapolTlsVersion': |
| global EAPOL_VERSION |
| log.info( 'Changing invalid field values in tls auth packets====== version changing' ) |
| EAPOL_VERSION = invalid_field_value |
| if invalid_field_name == 'eapolTlsType': |
| global EAP_TYPE_TLS |
| log.info( 'Changing invalid field values in tls auth packets====== EAP TYPE TLS changing' ) |
| EAP_TYPE_TLS = invalid_field_value |
| if invalid_field_name == 'eapolTypeID': |
| global EAP_TYPE_ID |
| log.info( 'Changing invalid field values in tls auth packets====== EAP TYPE TLS changing' ) |
| EAP_TYPE_ID = invalid_field_value |
| if invalid_field_name == 'eapolResponse': |
| global EAP_RESPONSE |
| log.info( 'Changing invalid field values in tls auth packets====== EAP TYPE TLS changing' ) |
| EAP_RESPONSE = invalid_field_value |
| |
| |
| @classmethod |
| def eap_tls_packets_field_value_replace(self, invalid_field_name = None): |
| log.info( 'Changing invalid field values in tls auth packets' ) |
| if invalid_field_name == 'eapolTlsVersion': |
| global EAPOL_VERSION |
| EAPOL_VERSION = 1 |
| log.info( 'Changing invalid field values in tls auth packets====== version changing' ) |
| if invalid_field_name == 'eapolTlsType': |
| global EAP_TYPE_TLS |
| EAP_TYPE_TLS = 13 |
| log.info( 'Changing invalid field values in tls auth packets====== version changing' ) |
| if invalid_field_name == 'eapolTypeID': |
| global EAP_TYPE_ID |
| EAP_TYPE_ID = 1 |
| log.info( 'Changing invalid field values in tls auth packets====== version changing' ) |
| if invalid_field_name == 'eapolResponse': |
| global EAP_RESPONSE |
| EAP_RESPONSE = 2 |
| log.info( 'Changing invalid field values in tls auth packets====== version changing' ) |
| |
| |