whisperBack/mail.py

   1 #!/usr/bin/env python3
   2 # -*- coding: UTF-8 -*-
   3
   4 ########################################################################
   5 # WhisperBack - Send feedback in an encrypted mail
   6 # Copyright (C) 2009-2018 Tails developers <tails@boum.org>
   7 #
   8 # This file is part of WhisperBack
   9 #
  10 # WhisperBack is  free software; you can redistribute  it and/or modify
  11 # it under the  terms of the GNU General Public  License as published by
  12 # the Free Software Foundation; either  version 3 of the License, or (at
  13 # your option) any later version.
  14 #
  15 # This program  is distributed in the  hope that it will  be useful, but
  16 # WITHOUT   ANY  WARRANTY;   without  even   the  implied   warranty  of
  17 # MERCHANTABILITY  or FITNESS  FOR A  PARTICULAR PURPOSE.   See  the GNU
  18 # General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 ########################################################################
  23
  24 """WhisperBack mailing library
  25
  26 """
  27
  28 import logging
  29 import smtplib
  30 import socket
  31 import socks
  32
  33 LOG = logging.getLogger(__name__)
  34
  35
  36 #pylint: disable=R0913
  37 def send_message (from_address, to_address, message, host="localhost",
  38                   port=25, socks_host="127.0.0.1", socks_port=9050):
  39     """Sends a mail
  40
  41     Send the message via our own SMTP server, but don't include the
  42     envelope header. This is based on an example from doc.python.org
  43
  44     @param from_address The sender's address
  45     @param to_address The recipient address
  46     @param message The content of the mail
  47     @param host The host of the smtp server to connect to
  48     @param port The port of the smtp server to connect to
  49     @param socks_host The host of the SOCKS proxy to connect through
  50     @param socks_port The port of the SOCKS proxy to connect through
  51     """
  52
  53     LOG.debug("Sending mail")
  54     # Monkeypatching the entire connection through the SOCKS proxy
  55     socks.set_default_proxy(socks.SOCKS5, socks_host, socks_port)
  56     socket.socket = socks.socksocket
  57
  58     try:
  59         # We set a long timeout because Tor is slow
  60         smtp = smtplib.SMTP(timeout=120, host=host, port=port)
  61     except ValueError:
  62         # socks assumes the host resolves to AF_INET and triggers a ValueError
  63         # if it's not the case. If a .onion address is given, it resolves to an
  64         # AF_INET address and to an AF_INET6 address. If the 1st doesn't connect,
  65         # the 2nd is tried, which make socks trigger the ValueError.
  66         # This issue is fixed upstream in socks, in which this situation raises
  67         # a socket.error (https://github.com/Anorov/PySocks/commit/4081b79)
  68         # XXX: this workaround should be removed when a version of socks containing
  69         # this commit reaches Tails.
  70         raise socket.error("PySocks doesn't support IPv6")
  71
  72     smtp.sendmail(from_address, [to_address], message)
  73     smtp.quit()