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Initial commit. Import from poezio!18

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Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
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Maxime “pep” Buquet 2019-12-23 02:12:07 +01:00
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Contributing to the Poezio-omemo project
========================================
To contribute, the preferred way is to commit your changes on some
publicly-available git repository (on a fork `on gitlab
<https://lab.louiz.org/poezio/poezio-omemo>`_ or on your own
repository) and to notify the developers with either:
- a ticket `on the bug tracker <https://lab.louiz.org/poezio/poezio-omemo/issues/new>`_
- a merge request `on gitlab <https://lab.louiz.org/poezio/poezio-omemo/merge_requests>`_
- a message on `the channel <xmpp:poezio@muc.poez.io?join>`_

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This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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Poezio OMEMO plugin
###################
This is a `Poezio <https://poez.io>`_ plugin providing OMEMO support. It
distributed separately for licensing reasons.
Use in poezio
-------------
Once installed (see the `Installation`_ section below), `/load omemo` in
Poezio.
See the Poezio `documentation
<https://doc.poez.io/plugins/index.html#plugin-autoload>`_ for more
information.
License
-------
This plugin is licensed under GPLv3.
Note on the underlying OMEMO library
------------------------------------
As stated in `python-xeddsa's
README <https://github.com/Syndace/python-xeddsa/blob/136b9f12c8286b9463566308963e70f090b60e50/README.md>`_,
(dependency of python-omemo), this library has not undergone any
security audits. If you have the knowledge, any help is welcome.
Please take this into consideration when using this library.
Installation
------------
- ArchLinux (AUR):
`python-poezio-omemo <https://aur.archlinux.org/packages/python-poezio-omemo>`_, or
`python-poezio-omemo-git <https://aur.archlinux.org/packages/python-poezio-omemo-git>`_
- PIP: `poezio-omemo`
- Manual: `python3 setup.py install`

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#! /usr/bin/env python3
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2019 Maxime “pep” Buquet <pep@bouah.net>
#
# Distributed under terms of the GPLv3 license.
"""
OMEMO Plugin.
"""
import os
import asyncio
import logging
from typing import Dict, List, Optional
from poezio.plugin_e2ee import E2EEPlugin
from poezio.xdg import DATA_HOME
from poezio.tabs import DynamicConversationTab, StaticConversationTab, MucTab
from omemo.exceptions import MissingBundleException
from slixmpp import JID
from slixmpp.stanza import Message
from slixmpp.exceptions import IqError, IqTimeout
from slixmpp_omemo import PluginCouldNotLoad, MissingOwnKey, NoAvailableSession
from slixmpp_omemo import UndecidedException, UntrustedException, EncryptionPrepareException
import slixmpp_omemo
log = logging.getLogger(__name__)
class Plugin(E2EEPlugin):
"""OMEMO (XEP-0384) Plugin"""
encryption_name = 'omemo'
eme_ns = slixmpp_omemo.OMEMO_BASE_NS
replace_body_with_eme = True
stanza_encryption = False
encrypted_tags = [
(slixmpp_omemo.OMEMO_BASE_NS, 'encrypted'),
]
# TODO: Look into blind trust stuff.
# https://gist.github.com/mar-v-in/b683220a55bc65dcdafc809be9c5d0e4
trust_states = {
'accepted': {
'verified',
'accepted',
}, 'rejected': {
'undecided',
'distrusted',
},
}
supported_tab_types = (DynamicConversationTab, StaticConversationTab, MucTab)
def init(self) -> None:
super().init()
self.info = lambda i: self.api.information(i, 'Info')
data_dir = os.path.join(DATA_HOME, 'omemo', self.core.xmpp.boundjid.bare)
os.makedirs(data_dir, exist_ok=True)
try:
self.core.xmpp.register_plugin(
'xep_0384', {
'data_dir': data_dir,
},
module=slixmpp_omemo,
) # OMEMO
except (PluginCouldNotLoad,):
log.exception('And error occured when loading the omemo plugin.')
asyncio.ensure_future(
self.core.xmpp['xep_0384'].session_start(self.core.xmpp.boundjid)
)
def display_error(self, txt) -> None:
self.api.information(txt, 'Error')
def get_fingerprints(self, jid: JID) -> List[str]:
devices = self.core.xmpp['xep_0384'].get_trust_for_jid(jid)
# XXX: What to do with did -> None entries?
# XXX: What to do with the active/inactive devices differenciation?
# For now I'll merge both. We should probably display them separately
# later on.
devices['active'].update(devices['inactive'])
return [
slixmpp_omemo.fp_from_ik(trust['key'])
for trust in devices['active'].values()
if trust is not None
]
def decrypt(self, message: Message, tab, allow_untrusted=False) -> None:
body = None
try:
mfrom = message['from']
encrypted = message['omemo_encrypted']
body = self.core.xmpp['xep_0384'].decrypt_message(encrypted, mfrom, allow_untrusted)
body = body.decode('utf-8')
except (MissingOwnKey,):
# The message is missing our own key, it was not encrypted for
# us, and we can't decrypt it.
self.display_error(
'I can\'t decrypt this message as it is not encrypted for me.'
)
except (NoAvailableSession,) as exn:
# We received a message from that contained a session that we
# don't know about (deleted session storage, etc.). We can't
# decrypt the message, and it's going to be lost.
# Here, as we need to initiate a new encrypted session, it is
# best if we send an encrypted message directly. XXX: Is it
# where we talk about self-healing messages?
self.display_error(
'I can\'t decrypt this message as it uses an encrypted '
'session I don\'t know about.',
)
except (UndecidedException, UntrustedException) as exn:
# We received a message from an untrusted device. We can
# choose to decrypt the message nonetheless, with the
# `allow_untrusted` flag on the `decrypt_message` call, which
# we will do here. This is only possible for decryption,
# encryption will require us to decide if we trust the device
# or not. Clients _should_ indicate that the message was not
# trusted, or in undecided state, if they decide to decrypt it
# anyway.
self.display_error(
"Your device '%s' is not in my trusted devices." % exn.device,
)
# We resend, setting the `allow_untrusted` parameter to True.
self.decrypt(message, tab, allow_untrusted=True)
except (EncryptionPrepareException,):
# Slixmpp tried its best, but there were errors it couldn't
# resolve. At this point you should have seen other exceptions
# and given a chance to resolve them already.
self.display_error('I was not able to decrypt the message.')
except (Exception,) as exn:
self.display_error('An error occured while attempting decryption.\n%r' % exn)
raise
if body is not None:
message['body'] = body
async def encrypt(self, message: Message, _tab) -> None:
mto = message['to']
body = message['body']
expect_problems = {} # type: Optional[Dict[JID, List[int]]]
while True:
try:
# `encrypt_message` excepts the plaintext to be sent, a list of
# bare JIDs to encrypt to, and optionally a dict of problems to
# expect per bare JID.
#
# Note that this function returns an `<encrypted/>` object,
# and not a full Message stanza. This combined with the
# `recipients` parameter that requires for a list of JIDs,
# allows you to encrypt for 1:1 as well as groupchats (MUC).
#
# TODO: Document expect_problems
# TODO: Handle multiple recipients (MUCs)
recipients = [mto]
encrypt = await self.core.xmpp['xep_0384'].encrypt_message(body, recipients, expect_problems)
message.append(encrypt)
return None
except UndecidedException as exn:
# The library prevents us from sending a message to an
# untrusted/undecided barejid, so we need to make a decision here.
# This is where you prompt your user to ask what to do. In
# this bot we will automatically trust undecided recipients.
self.core.xmpp['xep_0384'].trust(exn.bare_jid, exn.device, exn.ik)
# TODO: catch NoEligibleDevicesException
except EncryptionPrepareException as exn:
log.debug('FOO: EncryptionPrepareException: %r', exn.errors)
for error in exn.errors:
if isinstance(error, MissingBundleException):
self.display_error(
'Could not find keys for device "%d" of recipient "%s". Skipping.' %
(error.device, error.bare_jid),
)
jid = JID(error.bare_jid)
device_list = expect_problems.setdefault(jid, [])
device_list.append(error.device)
except (IqError, IqTimeout) as exn:
self.display_error(
'An error occured while fetching information on a recipient.\n%r' % exn,
)
return None
return None

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2019 Maxime “pep” Buquet <pep@bouah.net>
#
# Distributed under terms of the GPLv3+ license.
"""
Slixmpp OMEMO plugin
Copyright © 2019 Maxime “pep” Buquet <pep@bouah.net>
This file is part of poezio-omemo.
See the file LICENSE for copying permission.
"""
__version__ = "0.1.0"
__version_info__ = (0, 1, 0)

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poezio
slixmpp-omemo

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Poezio OMEMO plugin
Copyright (C) 2019 Maxime “pep” Buquet <pep@bouah.net>
This file is part of poezio-omemo.
See the file LICENSE for copying permission.
"""
import os
from typing import Any, Dict
from setuptools import setup
MODULE_FILE_PATH = os.path.join(
os.path.dirname(os.path.abspath(__file__)),
'poezio_plugins/omemo', 'version.py'
)
def get_version() -> str:
"""Returns version by looking at poezio_version/version.py"""
version: Dict[str, Any] = {}
with open(MODULE_FILE_PATH) as file:
exec(file.read(), version)
if '__version__' in version:
return version['__version__']
return 'missingno'
DESCRIPTION = ('Poezio OMEMO plugin')
VERSION = get_version()
with open('README.rst', encoding='utf8') as readme:
LONG_DESCRIPTION = readme.read()
CLASSIFIERS = [
'Development Status :: 3 - Alpha',
'Intended Audience :: Developers',
'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
'Programming Language :: Python',
'Programming Language :: Python :: 3.5',
'Programming Language :: Python :: 3.6',
'Programming Language :: Python :: 3.7',
'Topic :: Internet :: XMPP',
'Topic :: Security :: Cryptography',
'Topic :: Software Development :: Libraries :: Python Modules',
]
setup(
name="poezio-omemo",
version=VERSION,
description=DESCRIPTION,
long_description=LONG_DESCRIPTION,
long_description_content_type='text/x-rst',
author='Maxime Buquet',
author_email='pep@bouah.net',
url='https://lab.louiz.org/poezio/poezio-omemo',
license='GPLv3',
platforms=['any'],
packages=['poezio_plugins.omemo'],
install_requires=['poezio', 'slixmpp-omemo'],
classifiers=CLASSIFIERS,
)

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[tox]
envlist = py37