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#
# Copyright (c) 2014 ThoughtWorks, Inc.
#
# Pixelated is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pixelated 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
import errno
import traceback
import sys
import os
from leap.mail.imap.fetch import LeapIncomingMail
from leap.mail.imap.account import SoledadBackedAccount
from leap.mail.imap.memorystore import MemoryStore
from leap.mail.imap.soledadstore import SoledadStore
from pixelated.bitmask_libraries.config import LeapConfig
from pixelated.bitmask_libraries.provider import LeapProvider
from twisted.internet import reactor
from .nicknym import NickNym
from .auth import LeapAuthenticator, LeapCredentials
from .soledad import SoledadSessionFactory, SoledadSession
from .smtp import LeapSmtp
SESSIONS = {}
def open(username, password, server_name):
try:
certs_home = os.path.abspath(os.path.join(os.path.abspath(__file__), "..", "..", "certificates"))
config = LeapConfig(certs_home=certs_home)
provider = LeapProvider(server_name, config)
session = LeapSessionFactory(provider).create(LeapCredentials(username, password))
return session
except:
traceback.print_exc(file=sys.stdout)
raise
class LeapSession(object):
"""
A LEAP session.
Properties:
- ``leap_config`` the configuration for this session (LeapClientConfig).
- ``srp_session`` the secure remote password session to authenticate with LEAP. See http://en.wikipedia.org/wiki/Secure_Remote_Password_protocol (LeapSecureRemotePassword)
- ``soledad_session`` the soledad session. See https://leap.se/soledad (LeapSecureRemotePassword)
- ``nicknym`` the nicknym instance. See https://leap.se/nicknym (NickNym)
- ``account`` the actual leap mail account. Implements Twisted imap4.IAccount and imap4.INamespacePresenter (SoledadBackedAccount)
- ``incoming_mail_fetcher`` Background job for fetching incoming mails from LEAP server (LeapIncomingMail)
"""
def __init__(self, provider, srp_session, soledad_session, nicknym, soledad_account, incoming_mail_fetcher):
"""
Constructor.
:param leap_config: The config for this LEAP session
:type leap_config: LeapConfig
"""
self.config = provider.config
self.provider = provider
self.srp_session = srp_session
self.soledad_session = soledad_session
self.nicknym = nicknym
self.account = soledad_account
self.incoming_mail_fetcher = incoming_mail_fetcher
if self.config.start_background_jobs:
self.start_background_jobs()
def account_email(self):
domain = self.provider.domain
name = self.srp_session.user_name
return '%s@%s' % (name, domain)
def close(self):
self.stop_background_jobs()
def start_background_jobs(self):
reactor.callFromThread(self.incoming_mail_fetcher.start_loop)
def stop_background_jobs(self):
reactor.callFromThread(self.incoming_mail_fetcher.stop)
def sync(self):
try:
self.soledad_session.sync()
except:
traceback.print_exc(file=sys.stderr)
raise
class LeapSessionFactory(object):
def __init__(self, provider):
self._provider = provider
self._config = provider.config
def create(self, credentials):
key = self._session_key(credentials)
session = self._lookup_session(key)
if not session:
session = self._create_new_session(credentials)
self._remember_session(key, session)
return session
def _create_new_session(self, credentials):
self._create_dir(self._provider.config.leap_home)
self._provider.download_certificate_to('%s/ca.crt' % self._provider.config.leap_home)
auth = LeapAuthenticator(self._provider).authenticate(credentials)
soledad = SoledadSessionFactory.create(self._provider, auth, credentials.db_passphrase)
nicknym = self._create_nicknym(auth, soledad)
account = self._create_account(auth, soledad)
incoming_mail_fetcher = self._create_incoming_mail_fetcher(nicknym, soledad,
account, auth)
smtp = LeapSmtp(self._provider, nicknym.keymanager, auth)
smtp.start()
return LeapSession(self._provider, auth, soledad, nicknym, account, incoming_mail_fetcher)
def _lookup_session(self, key):
global SESSIONS
if key in SESSIONS:
return SESSIONS[key]
else:
return None
def _remember_session(self, key, session):
global SESSIONS
SESSIONS[key] = session
def _session_key(self, credentials):
return hash((self._provider, credentials.user_name))
def _create_dir(self, path):
try:
os.makedirs(path)
except OSError as exc:
if exc.errno == errno.EEXIST and os.path.isdir(path):
pass
else:
raise
def _create_soledad_session(self, srp_session, db_passphrase):
return SoledadSession(self._provider, db_passphrase, srp_session)
def _create_nicknym(self, srp_session, soledad_session):
return NickNym(self._provider, self._config, soledad_session, srp_session)
def _create_account(self, srp_session, soledad_session):
memstore = MemoryStore(permanent_store=SoledadStore(soledad_session.soledad))
return SoledadBackedAccount(srp_session.uuid, soledad_session.soledad, memstore)
def _create_incoming_mail_fetcher(self, nicknym, soledad_session, account, auth):
return LeapIncomingMail(nicknym.keymanager, soledad_session.soledad, account,
self._config.fetch_interval_in_s, self._account_email(auth))
def _account_email(self, auth):
domain = self._provider.domain
name = auth.user_name
return '%s@%s' % (name, domain)
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