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#!/usr/bin/python3
"""
A demonstration of Conch, allowing you to SSH into a running Python server and
inspect objects at a Python prompt.
If you're using the system install of Twisted, you may need to install Conch
separately, e.g. on Ubuntu:
$ sudo apt-get install python-twisted-conch
Once you've started the program, you can ssh in by doing:
$ ssh admin@localhost -p 5022
The password is 'secret'. Once you've reached the Python prompt, you have
access to the app object, and can import code, etc.:
>>> 3 + 4
7
>>> print(app)
<flask.app.Flask object at 0x18e1690>
"""
import logging
from flask import Flask
from crochet import setup, run_in_reactor
setup()
# Web server:
app = Flask(__name__)
@app.route('/')
def index():
return "Welcome to my boring web server!"
@run_in_reactor
def start_ssh_server(port, username, password, namespace):
"""
Start an SSH server on the given port, exposing a Python prompt with the
given namespace.
"""
# This is a lot of boilerplate, see http://tm.tl/6429 for a ticket to
# provide a utility function that simplifies this.
from twisted.internet import reactor
from twisted.conch.insults import insults
from twisted.conch import manhole, manhole_ssh
from twisted.cred.checkers import (
InMemoryUsernamePasswordDatabaseDontUse as MemoryDB)
from twisted.cred.portal import Portal
sshRealm = manhole_ssh.TerminalRealm()
def chainedProtocolFactory():
return insults.ServerProtocol(manhole.Manhole, namespace)
sshRealm.chainedProtocolFactory = chainedProtocolFactory
sshPortal = Portal(sshRealm, [MemoryDB(**{username: password})])
reactor.listenTCP(port, manhole_ssh.ConchFactory(sshPortal),
interface="127.0.0.1")
if __name__ == '__main__':
import sys
logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
start_ssh_server(5022, "admin", "secret", {"app": app})
app.run()
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