#!/usr/bin/env python

import os, sys, subprocess, time
from random import randint

from functools import wraps
from flask import Flask, request, Response
app = Flask(__name__)

auth_username = auth_password = ''

def check_auth(username, password):
    global auth_username, auth_password
    return username == auth_username and password == auth_password

def authenticate():
    return Response(
        'Could not verify your access level for that URL.\n'
        'You have to login with proper credentials', 401,
        {'WWW-Authenticate': 'Basic realm="Login Required"'})

def requires_auth(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        auth = request.authorization
        if not auth or not check_auth(auth.username, auth.password):
            return authenticate()
        return f(*args, **kwargs)
    return decorated

@app.route("/")
@requires_auth
def hello():
    return "Hello World!"

def reload_tor():
    subprocess.call(['/usr/sbin/service', 'tor', 'reload'])

def modify_firewall(port, open_port=True):
    if open_port:
        action = 'ACCEPT'
    else:
        action = 'REJECT'

    subprocess.call(['/sbin/iptables', '-I', 'OUTPUT', '-o', 'lo', '-p', 'tcp', '--dport', str(port), '-j', action])

if __name__ == '__main__':
    # check for root
    if not os.geteuid()==0:
        sys.exit('You need to run this as root')

    # arguements
    if len(sys.argv) != 2:
        sys.exit('Usage: {0} [filename]'.format(sys.argv[0]));
    filename = sys.argv[1]
    if not os.path.isfile(filename):
        sys.exit('{0} is not a file'.format(filename))

    # load torrc
    torrc_path = '/etc/tor/torrc'
    if os.path.isfile(torrc_path):
        torrc = open(torrc_path).read()
    else:
        sys.exit('Error opening {0} for reading'.format(torrc_path));
    
    # choose a port to listen on
    port = randint(1025, 65535)

    # choose a random username and password
    auth_username = os.urandom(8).encode('hex')
    auth_password = os.urandom(8).encode('hex')

    # set up hidden service
    print 'Modifying torrc to configure hidden service on port {0}'.format(port)
    hidserv_dir = 'HiddenServiceDir /var/lib/tor/hidden_service_{0}/'.format(port)
    hidserv_port = 'HiddenServicePort 80 127.0.0.1:{0}'.format(port)
    open(torrc_path, 'a+').write("\n{0}\n{1}\n".format(hidserv_dir, hidserv_port))
    reload_tor()

    # punch a hole in the firewall
    print 'Punching a hole in the firewall'
    modify_firewall(port)

    # get hidden service hostname
    print 'Waiting 10 seconds for hidden service to get configured...'
    time.sleep(10)
    onion_host = open('/var/lib/tor/hidden_service_{0}/hostname'.format(port), 'r').read().strip()

    # instructions
    print '\nGive this information to the person you''re sending the file to:'
    print 'URL: http://{0}/'.format(onion_host)
    print 'Username: {0}'.format(auth_username)
    print 'Password: {0}'.format(auth_password)
    print ''
    print 'Press Ctrl-C to stop server\n'

    # start the web server
    app.run(port=port)
    print '\n'

    # shutdown
    print 'Restoring original torrc'
    open(torrc_path, 'w').write(torrc)
    reload_tor()
    print 'Closing hole in firewall'
    modify_firewall(port, False)