#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import os
import datetime
import socket
import logging
logging.basicConfig(format='%(message)s')
import threading
from io import BytesIO
from xml.etree import ElementTree
from http.server import HTTPServer
from socketserver import ThreadingMixIn
from http.server import SimpleHTTPRequestHandler
import ike_server
class NonBlockingHTTPServer(ThreadingMixIn, HTTPServer):
pass
def header_split(h):
return [list(map(str.strip, l.split(': ', 1))) for l in h.strip().splitlines()]
class WebLogicHandler(SimpleHTTPRequestHandler):
logger = None
protocol_version = "HTTP/1.1"
EXPLOIT_STRING = b"host-scan-reply"
RESPONSE = b"""
9.0(1)
VPN Server could not parse request.
"""
basepath = os.path.dirname(os.path.abspath(__file__))
alert_function = None
def setup(self):
SimpleHTTPRequestHandler.setup(self)
self.request.settimeout(3)
def send_header(self, keyword, value):
if keyword.lower() == 'server':
return
SimpleHTTPRequestHandler.send_header(self, keyword, value)
def send_head(self):
# send_head will return a file object that do_HEAD/GET will use
# do_GET/HEAD are already implemented by SimpleHTTPRequestHandler
filename = os.path.basename(self.path.rstrip('/').split('?', 1)[0])
if self.path == '/':
self.send_response(200)
for k, v in header_split("""
Content-Type: text/html
Cache-Control: no-cache
Pragma: no-cache
Set-Cookie: tg=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
Set-Cookie: webvpn=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
Set-Cookie: webvpnc=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
Set-Cookie: webvpn_portal=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
Set-Cookie: webvpnSharePoint=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
Set-Cookie: webvpnlogin=1; path=/; secure
Set-Cookie: sdesktop=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
"""):
self.send_header(k, v)
self.end_headers()
return BytesIO(b'\n')
elif filename == 'asa': # don't allow dir listing
return self.send_file('wrong_url.html', 403)
else:
return self.send_file(filename)
def redirect(self, loc):
self.send_response(302)
for k, v in header_split("""
Content-Type: text/html
Content-Length: 0
Cache-Control: no-cache
Pragma: no-cache
Location: %s
Set-Cookie: tg=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
""" % (loc,)):
self.send_header(k, v)
self.end_headers()
def do_GET(self):
if self.path == '/+CSCOE+/logon.html':
self.redirect('/+CSCOE+/logon.html?fcadbadd=1')
return
elif self.path.startswith('/+CSCOE+/logon.html?') and 'reason=1' in self.path:
self.wfile.write(self.send_file('logon_failure').getvalue())
return
SimpleHTTPRequestHandler.do_GET(self)
def do_POST(self):
data_len = int(self.headers.get('Content-length', 0))
data = self.rfile.read(data_len) if data_len else b''
body = self.RESPONSE
if self.EXPLOIT_STRING in data:
xml = ElementTree.fromstring(data)
payloads = []
for x in xml.iter('host-scan-reply'):
payloads.append(x.text)
self.alert_function(self.client_address[0], self.client_address[1], payloads)
elif self.path == '/':
self.redirect('/+webvpn+/index.html')
return
elif self.path == '/+CSCOE+/logon.html':
self.redirect('/+CSCOE+/logon.html?fcadbadd=1')
return
elif self.path.split('?', 1)[0] == '/+webvpn+/index.html':
with open(os.path.join(self.basepath, 'asa', "logon_redir.html"), 'rb') as fh:
body = fh.read()
self.send_response(200)
self.send_header('Content-Length', int(len(body)))
self.send_header('Content-Type', 'text/html; charset=UTF-8')
self.end_headers()
self.wfile.write(body)
return
def send_file(self, filename, status_code=200, headers=[]):
try:
with open(os.path.join(self.basepath, 'asa', filename), 'rb') as fh:
body = fh.read()
self.send_response(status_code)
for k, v in headers:
self.send_header(k, v)
if status_code == 200:
for k, v in header_split("""
Cache-Control: max-age=0
Set-Cookie: webvpn=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
Set-Cookie: webvpnc=; expires=Thu, 01 Jan 1970 22:00:00 GMT; path=/; secure
Set-Cookie: webvpnlogin=1; secure
X-Transcend-Version: 1
"""):
self.send_header(k, v)
self.send_header('Content-Length', int(len(body)))
self.send_header('Content-Type', 'text/html')
self.end_headers()
return BytesIO(body)
except IOError:
return self.send_file('wrong_url.html', 404)
def log_message(self, format, *args):
self.logger.debug("{'timestamp': '%s', 'src_ip': '%s', 'payload_printable': '%s'}" %
(datetime.datetime.utcnow().isoformat(),
self.client_address[0],
format % args))
def handle_one_request(self):
"""Handle a single HTTP request.
Overriden to not send 501 errors
"""
self.close_connection = True
try:
self.raw_requestline = self.rfile.readline(65537)
if len(self.raw_requestline) > 65536:
self.requestline = ''
self.request_version = ''
self.command = ''
self.close_connection = 1
return
if not self.raw_requestline:
self.close_connection = 1
return
if not self.parse_request():
# An error code has been sent, just exit
return
mname = 'do_' + self.command
if not hasattr(self, mname):
self.log_request()
self.close_connection = True
return
method = getattr(self, mname)
method()
self.wfile.flush() # actually send the response if not already done.
except socket.timeout as e:
# a read or a write timed out. Discard this connection
self.log_error("Request timed out: %r", e)
self.close_connection = 1
return
if __name__ == '__main__':
import click
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger()
logger.info('info')
@click.command()
@click.option('-h', '--host', default='0.0.0.0', help='Host to listen')
@click.option('-p', '--port', default=8443, help='Port to listen', type=click.INT)
@click.option('-i', '--ike-port', default=5000, help='Port to listen for IKE', type=click.INT)
@click.option('-s', '--enable_ssl', default=False, help='Enable SSL', is_flag=True)
@click.option('-c', '--cert', default=None, help='Certificate File Path (will generate self signed '
'cert if not supplied)')
@click.option('-v', '--verbose', default=False, help='Verbose logging', is_flag=True)
def start(host, port, ike_port, enable_ssl, cert, verbose):
"""
A low interaction honeypot for the Cisco ASA component capable of detecting CVE-2018-0101,
a DoS and remote code execution vulnerability
"""
def alert(cls, host, port, payloads):
logger.critical({
'timestamp': datetime.datetime.utcnow().isoformat(),
'src_ip': host,
'src_port': port,
'payload_printable': payloads,
})
if verbose:
logger.setLevel(logging.DEBUG)
requestHandler = WebLogicHandler
requestHandler.alert_function = alert
requestHandler.logger = logger
def log_date_time_string():
"""Return the current time formatted for logging."""
now = datetime.datetime.utcnow().isoformat()
return now
def ike():
ike_server.start(host, ike_port, alert, logger)
t = threading.Thread(target=ike)
t.daemon = True
t.start()
httpd = HTTPServer((host, port), requestHandler)
if enable_ssl:
import ssl
if not cert:
import gencert
cert = gencert.gencert()
httpd.socket = ssl.wrap_socket(httpd.socket, certfile=cert, server_side=True)
logger.info('Starting server on port {:d}/tcp, use to stop'.format(port))
try:
httpd.serve_forever()
except KeyboardInterrupt:
pass
logger.info('Stopping server.')
httpd.server_close()
start()