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eapauth.py
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eapauth.py
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#coding=utf-8
__all__ = ["EAPAuth"]
import socket
import os, sys
from subprocess import call
import hashlib
from struct import pack, unpack
from binascii import hexlify
import multiprocessing
from eappacket import *
import time
PACKET_OUTPUT = False
def display_prompt(string):
print '[*]', string
def display_packet(packet, header=""):
if PACKET_OUTPUT:
print '%s Packet info: ' % header
print '\tFrom: ' + hexlify(packet[0:6])
print '\tTo: ' + hexlify(packet[6:12])
print '\tType: ' + hexlify(packet[12:14])
print '\tContent: ' + hexlify(packet[14:])
class EAPAuth:
def __init__(self, login_info, success_handler = None, success_callback_args=()):
# bind the h3c client to the EAP protocal
self.client = socket.socket(
socket.AF_PACKET, socket.SOCK_RAW, socket.htons(ETHERTYPE_PAE))
self.client.bind((login_info['ethernet_interface'], ETHERTYPE_PAE))
# get local ethernet card address
self.mac_addr = self.client.getsockname()[4]
self.ethernet_header = get_ethernet_header(
self.mac_addr, PAE_GROUP_ADDR, ETHERTYPE_PAE)
self.has_sent_logoff = False
self.login_info = login_info
self.success_callback = success_handler
self.success_callback_args = success_callback_args
def send_start(self):
# sent eapol start packet
eap_start_packet = fill_bytes(self.ethernet_header + get_EAPOL(EAPOL_START))
display_packet(eap_start_packet, "Start")
self.client.send(eap_start_packet)
display_prompt('Sending EAPOL start')
def send_logoff(self):
# sent eapol logoff packet
eap_logoff_packet = self.ethernet_header + get_EAPOL(EAPOL_LOGOFF)
display_packet(eap_logoff_packet, "Logoff")
self.client.send(eap_logoff_packet)
self.has_sent_logoff = True
display_prompt('Sending EAPOL logoff')
def send_response_id(self, packet_id):
eap_response_id_packet = self.ethernet_header + \
get_EAPOL(EAPOL_EAPPACKET,
get_EAP(EAP_RESPONSE,
packet_id,
EAP_TYPE_ID,
get_identity_data(self.login_info)))
display_packet(eap_response_id_packet, "Response_ID")
self.client.send(eap_response_id_packet)
def send_response_md5(self, packet_id, md5data):
password = self.login_info['password']
username = self.login_info['username']
eap_md5 = hashlib.md5(chr(packet_id) + password + md5data).digest()
md5_length = '\x10' # md5_value_size = 16
resp = md5_length + eap_md5 + username
# resp = chr(len(chap)) + ''.join(chap) + self.login_info['username']
eap_packet = fill_bytes(self.ethernet_header + \
get_EAPOL(EAPOL_EAPPACKET, get_EAP(
EAP_RESPONSE, packet_id, EAP_TYPE_MD5, resp)))
display_packet(eap_packet, "Response_MD5")
try:
self.client.send(eap_packet)
except socket.error, msg:
print "Connection error!"
exit(-1)
def display_login_message(self, msg):
"""
display the messages received form the radius server,
including the error meaasge after logging failed or
other meaasge from networking centre
"""
try:
print msg.decode('gbk')
except UnicodeDecodeError:
print msg
def EAP_handler(self, eap_packet):
vers, type, eapol_len = unpack("!BBH", eap_packet[:4])
if type != EAPOL_EAPPACKET:
display_prompt('Got unknown EAPOL type %i' % type)
# EAPOL_EAPPACKET type
code, id, eap_len = unpack("!BBH", eap_packet[4:8])
if code == EAP_SUCCESS:
display_prompt('Got EAP Success')
if self.login_info['dhcp_command']:
display_prompt('802.1X Login successfully')
time.sleep(10)
if self.success_callback:
multiprocessing.Process(target=self.success_callback,
args=self.success_callback_args).start()
elif code == EAP_FAILURE:
if (self.has_sent_logoff):
display_prompt('Logoff Successfully!')
#self.display_login_message(eap_packet[10:])
else:
display_prompt('Got EAP Failure')
#self.display_login_message(eap_packet[10:])
exit(-1)
elif code == EAP_RESPONSE:
display_prompt('Got Unknown EAP Response')
elif code == EAP_REQUEST:
reqtype = unpack("!B", eap_packet[8:9])[0]
reqdata = eap_packet[9:4 + eap_len]
# type
if reqtype == EAP_TYPE_ID:
display_prompt('Got EAP Request for identity')
self.send_response_id(id)
display_prompt('Sending EAP response with identity = [%s]'
% self.login_info['username'])
elif reqtype == EAP_TYPE_MD5:
data_len = unpack("!B", reqdata[0:1])[0]
md5data = reqdata[1:1 + data_len]
display_prompt('Got EAP Request for MD5-Challenge')
self.send_response_md5(id, md5data)
display_prompt('Sending EAP response with password')
else:
display_prompt('Got unknown Request type (%i)' % reqtype)
elif code == 10 and id == 5:
self.display_login_message(eap_packet[12:])
else:
display_prompt('Got unknown EAP code (%i)' % code)
def serve_forever(self):
try:
self.send_start()
while True:
# 根据一份样本似乎是 15s 认证一次，但是样本没有发送密码
eap_packet = self.client.recv(1600)
# strip the ethernet_header and handle
self.EAP_handler(eap_packet[14:])
except KeyboardInterrupt:
print 'Interrupted by user'
self.send_logoff()
except socket.error, msg:
print "Connection error: %s" % msg
exit(-1)