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# -*- coding: utf-8 -*-
# smtpbootstrapper.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/>.
"""
SMTP bootstrapping
"""
import os
import warnings
from requests.exceptions import HTTPError
from leap.bitmask.config.providerconfig import ProviderConfig
from leap.bitmask.crypto.certs import download_client_cert
from leap.bitmask.logs.utils import get_logger
from leap.bitmask.services import download_service_config
from leap.bitmask.services.abstractbootstrapper import AbstractBootstrapper
from leap.bitmask.services.mail.smtpconfig import SMTPConfig
from leap.bitmask.util import is_file
from leap.common import certs as leap_certs
from leap.common.check import leap_assert
from leap.common.files import check_and_fix_urw_only
logger = get_logger()
class NoSMTPHosts(Exception):
"""This is raised when there is no SMTP host to use."""
class MalformedUserId(Exception):
"""This is raised when an userid does not have the form user@provider."""
class SMTPBootstrapper(AbstractBootstrapper):
"""
SMTP init procedure
"""
PORT_KEY = "port"
IP_KEY = "ip_address"
def __init__(self):
AbstractBootstrapper.__init__(self)
self._provider_config = None
self._smtp_config = None
self._userid = None
self._download_if_needed = False
self._smtp_service = None
self._smtp_port = None
def _download_config_and_cert(self):
"""
Downloads the SMTP config and cert for the given provider.
"""
leap_assert(self._provider_config,
"We need a provider configuration!")
logger.debug("Downloading SMTP config for %s" %
(self._provider_config.get_domain(),))
download_service_config(
self._provider_config,
self._smtp_config,
self._session,
self._download_if_needed)
hosts = self._smtp_config.get_hosts()
if len(hosts) == 0:
raise NoSMTPHosts()
# TODO handle more than one host and define how to choose
hostname = hosts.keys()[0]
logger.debug("Using hostname %s for SMTP" % (hostname,))
client_cert_path = self._smtp_config.get_client_cert_path(
self._userid, self._provider_config, about_to_download=True)
if not is_file(client_cert_path):
# For re-download if something is wrong with the cert
self._download_if_needed = (
self._download_if_needed and
not leap_certs.should_redownload(client_cert_path))
if self._download_if_needed and os.path.isfile(client_cert_path):
check_and_fix_urw_only(client_cert_path)
return
try:
download_client_cert(self._provider_config,
client_cert_path,
self._session, kind="smtp")
except HTTPError as exc:
if exc.message.startswith('403 Client Error'):
logger.debug(
'Auth problem downloading smtp certificate... '
'It might be a provider problem, will try '
'fetching from vpn pool')
warnings.warn(
'Compatibility hack for platform 0.7 not fully '
'supporting smtp certificates. Will be deprecated in '
'bitmask 0.10')
download_client_cert(self._provider_config,
client_cert_path,
self._session, kind="vpn")
else:
raise
def _start_smtp_service(self):
"""
Start the smtp service using the downloaded configurations.
"""
# TODO Make the encrypted_only configurable
# TODO pick local smtp port in a better way
# TODO remove hard-coded port and let leap.mail set
# the specific default.
# TODO handle more than one host and define how to choose
hosts = self._smtp_config.get_hosts()
hostname = hosts.keys()[0]
host = hosts[hostname][self.IP_KEY].encode("utf-8")
port = hosts[hostname][self.PORT_KEY]
client_cert_path = self._smtp_config.get_client_cert_path(
self._userid, self._provider_config, about_to_download=True)
from leap.mail.smtp import setup_smtp_gateway
self._smtp_service, self._smtp_port = setup_smtp_gateway(
port=2013,
userid=self._userid,
keymanager=self._keymanager,
smtp_host=host,
smtp_port=port,
smtp_cert=client_cert_path,
smtp_key=client_cert_path,
encrypted_only=False)
def start_smtp_service(self, keymanager, userid, download_if_needed=False):
"""
Starts the SMTP service.
:param keymanager: a transparent proxy that eventually will point to a
Keymanager Instance.
:type keymanager: zope.proxy.ProxyBase
:param userid: the user id, in the form "user@provider"
:type userid: str
:param download_if_needed: True if it should check for mtime
for the file
:type download_if_needed: bool
"""
try:
username, domain = userid.split('@')
except ValueError:
logger.critical("Malformed userid parameter!")
raise MalformedUserId()
self._provider_config = ProviderConfig.get_provider_config(domain)
self._keymanager = keymanager
self._smtp_config = SMTPConfig()
self._userid = str(userid)
self._download_if_needed = download_if_needed
try:
self._download_config_and_cert()
logger.debug("Starting SMTP service.")
self._start_smtp_service()
except NoSMTPHosts:
logger.warning("There is no SMTP host to use.")
except Exception as e:
# TODO: we should handle more specific exceptions in here
logger.exception("Error while bootstrapping SMTP: %r" % (e, ))
def stop_smtp_service(self):
"""
Stops the smtp service (port and factory).
"""
if self._smtp_service is not None:
logger.debug('Stopping SMTP service.')
self._smtp_port.stopListening()
self._smtp_service.doStop()
else:
logger.debug('SMTP service not running.')
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