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#!/usr/bin/env python
# Copyright (C) 2003-2007 Robey Pointer <robeypointer@gmail.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import base64
from binascii import hexlify
import getpass
import os
import select
import socket
import sys
import time
import traceback
from paramiko.py3compat import input
import paramiko
try:
import interactive
except ImportError:
from . import interactive
def agent_auth(transport, username):
"""
Attempt to authenticate to the given transport using any of the private
keys available from an SSH agent.
"""
agent = paramiko.Agent()
agent_keys = agent.get_keys()
if len(agent_keys) == 0:
return
for key in agent_keys:
print("Trying ssh-agent key %s" % hexlify(key.get_fingerprint()))
try:
transport.auth_publickey(username, key)
print("... success!")
return
except paramiko.SSHException:
print("... nope.")
def manual_auth(username, hostname):
default_auth = "p"
auth = input(
"Auth by (p)assword, (r)sa key, or (d)ss key? [%s] " % default_auth
)
if len(auth) == 0:
auth = default_auth
if auth == "r":
default_path = os.path.join(os.environ["HOME"], ".ssh", "id_rsa")
path = input("RSA key [%s]: " % default_path)
if len(path) == 0:
path = default_path
try:
key = paramiko.RSAKey.from_private_key_file(path)
except paramiko.PasswordRequiredException:
password = getpass.getpass("RSA key password: ")
key = paramiko.RSAKey.from_private_key_file(path, password)
t.auth_publickey(username, key)
elif auth == "d":
default_path = os.path.join(os.environ["HOME"], ".ssh", "id_dsa")
path = input("DSS key [%s]: " % default_path)
if len(path) == 0:
path = default_path
try:
key = paramiko.DSSKey.from_private_key_file(path)
except paramiko.PasswordRequiredException:
password = getpass.getpass("DSS key password: ")
key = paramiko.DSSKey.from_private_key_file(path, password)
t.auth_publickey(username, key)
else:
pw = getpass.getpass("Password for %s@%s: " % (username, hostname))
t.auth_password(username, pw)
# setup logging
paramiko.util.log_to_file("demo.log")
username = ""
if len(sys.argv) > 1:
hostname = sys.argv[1]
if hostname.find("@") >= 0:
username, hostname = hostname.split("@")
else:
hostname = input("Hostname: ")
if len(hostname) == 0:
print("*** Hostname required.")
sys.exit(1)
port = 22
if hostname.find(":") >= 0:
hostname, portstr = hostname.split(":")
port = int(portstr)
# now connect
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((hostname, port))
except Exception as e:
print("*** Connect failed: " + str(e))
traceback.print_exc()
sys.exit(1)
try:
t = paramiko.Transport(sock)
try:
t.start_client()
except paramiko.SSHException:
print("*** SSH negotiation failed.")
sys.exit(1)
try:
keys = paramiko.util.load_host_keys(
os.path.expanduser("~/.ssh/known_hosts")
)
except IOError:
try:
keys = paramiko.util.load_host_keys(
os.path.expanduser("~/ssh/known_hosts")
)
except IOError:
print("*** Unable to open host keys file")
keys = {}
# check server's host key -- this is important.
key = t.get_remote_server_key()
if hostname not in keys:
print("*** WARNING: Unknown host key!")
elif key.get_name() not in keys[hostname]:
print("*** WARNING: Unknown host key!")
elif keys[hostname][key.get_name()] != key:
print("*** WARNING: Host key has changed!!!")
sys.exit(1)
else:
print("*** Host key OK.")
# get username
if username == "":
default_username = getpass.getuser()
username = input("Username [%s]: " % default_username)
if len(username) == 0:
username = default_username
agent_auth(t, username)
if not t.is_authenticated():
manual_auth(username, hostname)
if not t.is_authenticated():
print("*** Authentication failed. :(")
t.close()
sys.exit(1)
chan = t.open_session()
chan.get_pty()
chan.invoke_shell()
print("*** Here we go!\n")
interactive.interactive_shell(chan)
chan.close()
t.close()
except Exception as e:
print("*** Caught exception: " + str(e.__class__) + ": " + str(e))
traceback.print_exc()
try:
t.close()
except:
pass
sys.exit(1)
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