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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# mail_receiver.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import uuid as pyuuid
import logging
import argparse
import ConfigParser
import json
from email import message_from_string
from functools import partial
from twisted.internet import inotify, reactor
from twisted.python import filepath
from leap.mx import couchdbhelper
from leap.soledad import LeapDocument
from leap.soledad.backends.leap_backend import EncryptionSchemes
from leap.soledad.backends.couch import CouchDatabase
from leap.common.keymanager import openpgp
logger = logging.getLogger(__name__)
def _get_pubkey(uuid, cdb):
logger.debug("Fetching pubkey for %s" % (uuid,))
return uuid, cdb.getPubKey(uuid)
def _encrypt_message(uuid_pubkey, address_message):
uuid, pubkey = uuid_pubkey
address, message = address_message
logger.debug("Encrypting message to %s's pubkey" % (uuid,))
logger.debug("Pubkey: %s" % (pubkey,))
if pubkey is None or len(pubkey) == 0:
logger.exception("No public key found")
raise Exception("No public key found")
doc = LeapDocument(encryption_scheme=EncryptionSchemes.PUBKEY,
doc_id=str(pyuuid.uuid4()))
def _ascii_to_openpgp_cb(gpg):
key = gpg.list_keys().pop()
return openpgp._build_key_from_gpg(address, key, pubkey)
openpgp_key = openpgp._safe_call(_ascii_to_openpgp_cb, pubkey)
data = {'incoming': True, 'content': message}
doc.content = {
"_encrypted_json": openpgp.encrypt_asym(json.dumps(data), openpgp_key)
}
return uuid, doc
def _export_message(uuid_doc, couch_url):
uuid, doc = uuid_doc
logger.debug("Exporting message for %s" % (uuid,))
if uuid is None:
uuid = 0
db = CouchDatabase(couch_url, "user-%s" % (uuid,))
db.put_doc(doc)
logger.debug("Done exporting")
return True
def _conditional_remove(do_remove, filepath):
if do_remove:
# remove the original mail
try:
logger.debug("Removing %s" % (filepath.path,))
filepath.remove()
logger.debug("Done removing")
except Exception as e:
# TODO: better handle exceptions
logger.exception("%s" % (e,))
def _process_incoming_email(users_db, mail_couchdb_url_prefix, self, filepath, mask):
if os.path.split(filepath.dirname())[-1] == "new":
logger.debug("Processing new mail at %s" % (filepath.path,))
with filepath.open("r") as f:
mail_data = f.read()
mail = message_from_string(mail_data)
owner = mail["To"]
if owner is None: # default to Delivered-To
owner = mail["Delivered-To"]
owner = owner.split("@")[0]
owner = owner.split("+")[0]
logger.debug("Mail owner: %s" % (owner,))
logger.debug("%s received a new mail" % (owner,))
d = users_db.queryByLoginOrAlias(owner)
d.addCallback(_get_pubkey, (users_db))
d.addCallback(_encrypt_message, (owner, mail_data))
d.addCallback(_export_message, (mail_couchdb_url_prefix))
d.addCallback(_conditional_remove, (filepath))
def main():
epilog = "Copyright 2012 The LEAP Encryption Access Project"
parser = argparse.ArgumentParser(description="""LEAP MX Mail receiver""", epilog=epilog)
parser.add_argument('-d', '--debug', action="store_true",
help="Launches the LEAP MX mail receiver with debug output")
parser.add_argument('-l', '--logfile', metavar="LOG FILE", nargs='?',
action="store", dest="log_file",
help="Writes the logs to the specified file")
parser.add_argument('-c', '--config', metavar="CONFIG FILE", nargs='?',
action="store", dest="config",
help="Where to look for the configuration file. " \
"Default: mail_receiver.cfg")
opts, _ = parser.parse_known_args()
debug = opts.debug
config_file = opts.config
if debug:
level = logging.DEBUG
else:
level = logging.WARNING
if config_file is None:
config_file = "leap_mx.cfg"
logger.setLevel(level)
console = logging.StreamHandler()
console.setLevel(level)
formatter = logging.Formatter(
'%(asctime)s '
'- %(name)s - %(levelname)s - %(message)s')
console.setFormatter(formatter)
logger.addHandler(console)
logger.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
logger.info(" LEAP MX Mail receiver")
logger.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
logger.info("Reading configuration from %s" % (config_file,))
config = ConfigParser.ConfigParser()
config.read(config_file)
users_user = config.get("couchdb", "users_user")
users_password = config.get("couchdb", "users_password")
mail_user = config.get("couchdb", "mail_user")
mail_password = config.get("couchdb", "mail_password")
server = config.get("couchdb", "server")
port = config.get("couchdb", "port")
wm = inotify.INotify(reactor)
wm.startReading()
mask = inotify.IN_CREATE
users_db = couchdbhelper.ConnectedCouchDB(server,
port=port,
dbName="users",
username=users_user,
password=users_password)
mail_couch_url_prefix = "http://%s:%s@localhost:%s" % (mail_user,
mail_password,
port)
incoming_partial = partial(_process_incoming_email, users_db, mail_couch_url_prefix)
for section in config.sections():
if section in ("couchdb"):
continue
to_watch = config.get(section, "path")
recursive = config.getboolean(section, "recursive")
logger.debug("Watching %s --- Recursive: %s" % (to_watch, recursive))
wm.watch(filepath.FilePath(to_watch), mask, callbacks=[incoming_partial], recursive=recursive)
reactor.run()
if __name__ == "__main__":
main()
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