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# -*- coding: utf-8 -*-
'''
Copyright 2015 Bahtiar `kalkin-` Gadimov <bahtiar@gadimov.de>
Copyright 2015 Daniel Gultsch <daniel@cgultsch.de>
Copyright 2016 Philipp Hörist <philipp@hoerist.com>
This file is part of Gajim-OMEMO plugin.
The Gajim-OMEMO plugin 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.
Gajim-OMEMO 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
the Gajim-OMEMO plugin. If not, see <http://www.gnu.org/licenses/>.
'''
import logging
import binascii
import threading
from gi.repository import GLib
from gajim import dialogs
from gajim.common import app, ged
from gajim.common.pep import SUPPORTED_PERSONAL_USER_EVENTS
from gajim.plugins import GajimPlugin
from gajim.groupchat_control import GroupchatControl
from omemo.xmpp import DevicelistPEP
CRYPTOGRAPHY_MISSING = 'You are missing Python-Cryptography'
AXOLOTL_MISSING = 'You are missing Python-Axolotl or use an outdated version'
PROTOBUF_MISSING = 'OMEMO cant import Google Protobuf, you can find help in ' \
'the GitHub Wiki'
ERROR_MSG = ''
log = logging.getLogger('gajim.plugin_system.omemo')
try:
from omemo.file_decryption import FileDecryption
except Exception as error:
log.exception(error)
ERROR_MSG = CRYPTOGRAPHY_MISSING
try:
import google.protobuf
except Exception as error:
log.error(error)
ERROR_MSG = PROTOBUF_MISSING
try:
import axolotl
except Exception as error:
log.error(error)
ERROR_MSG = AXOLOTL_MISSING
if not ERROR_MSG:
try:
from omemo.omemo_connection import OMEMOConnection
from omemo.ui import OMEMOConfigDialog, FingerprintWindow
except Exception as error:
log.error(error)
ERROR_MSG = 'Error: %s' % error
# pylint: disable=no-init
# pylint: disable=attribute-defined-outside-init
class OmemoPlugin(GajimPlugin):
def init(self):
""" Init """
if ERROR_MSG:
self.activatable = False
self.available_text = ERROR_MSG
self.config_dialog = None
return
self.encryption_name = 'OMEMO'
self.allow_groupchat = True
self.events_handlers = {
'signed-in': (ged.PRECORE, self.signed_in),
}
self.config_dialog = OMEMOConfigDialog(self)
self.gui_extension_points = {
'hyperlink_handler': (self._file_decryption, None),
'encrypt' + self.encryption_name: (self._encrypt_message, None),
'gc_encrypt' + self.encryption_name: (
self._gc_encrypt_message, None),
'decrypt': (self._message_received, None),
'send_message' + self.encryption_name: (
self.before_sendmessage, None),
'encryption_dialog' + self.encryption_name: (
self.on_encryption_button_clicked, None),
'encryption_state' + self.encryption_name: (
self.encryption_state, None)}
SUPPORTED_PERSONAL_USER_EVENTS.append(DevicelistPEP)
self.disabled_accounts = []
self.windowinstances = {}
self.connections = {}
self.config_default_values = {'DISABLED_ACCOUNTS': ([], ''), }
for account in self.config['DISABLED_ACCOUNTS']:
self.disabled_accounts.append(account)
# add aesgcm:// uri scheme to config
schemes = app.config.get('uri_schemes')
if 'aesgcm://' not in schemes.split():
schemes += ' aesgcm://'
app.config.set('uri_schemes', schemes)
def signed_in(self, event):
""" Method called on SignIn
Parameters
----------
event : SignedInEvent
"""
account = event.conn.name
if account in self.disabled_accounts:
return
if account not in self.connections:
self.connections[account] = OMEMOConnection(account, self)
self.connections[account].signed_in(event)
def activate(self):
""" Method called when the Plugin is activated in the PluginManager
"""
for account in app.connections:
if account in self.disabled_accounts:
continue
self.connections[account] = OMEMOConnection(account, self)
self.connections[account].activate()
def deactivate(self):
""" Method called when the Plugin is deactivated in the PluginManager
"""
for account in self.connections:
self.connections[account].deactivate()
def activate_encryption(self, chat_control):
if isinstance(chat_control, GroupchatControl):
if chat_control.room_jid not in self.groupchat:
dialogs.ErrorDialog(
_('Bad Configuration'),
_('To use OMEMO in a Groupchat, the Groupchat should be'
' non-anonymous and members-only.'))
return False
return True
def _message_received(self, conn, obj, callback):
self.connections[conn.name].message_received(conn, obj, callback)
def _gc_encrypt_message(self, conn, obj, callback):
self.connections[conn.name].gc_encrypt_message(conn, obj, callback)
def _encrypt_message(self, conn, obj, callback):
self.connections[conn.name].encrypt_message(conn, obj, callback)
def _file_decryption(self, url, kind, instance, window):
FileDecryption(self).hyperlink_handler(url, kind, instance, window)
def encrypt_file(self, file, account, callback):
thread = threading.Thread(target=self._encrypt_file_thread,
args=(file, account, callback))
thread.daemon = True
thread.start()
def _encrypt_file_thread(self, file, account, callback):
omemo = self.get_omemo(account)
encrypted_data, key, iv = omemo.encrypt_file(file.get_data(full=True))
file.encrypted = True
file.size = len(encrypted_data)
file.user_data = binascii.hexlify(iv + key).decode('utf-8')
file.data = encrypted_data
if file.event.isSet():
return
GLib.idle_add(callback, file)
@staticmethod
def encryption_state(chat_control, state):
state['visible'] = True
state['authenticated'] = True
def on_encryption_button_clicked(self, chat_control):
self.show_fingerprint_window(chat_control)
def get_omemo(self, account):
return self.connections[account].omemo
def before_sendmessage(self, chat_control):
account = chat_control.account
contact = chat_control.contact
self.new_fingerprints_available(chat_control)
if isinstance(chat_control, GroupchatControl):
room = chat_control.room_jid
missing = True
own_jid = app.get_jid_from_account(account)
for nick in self.groupchat[room]:
real_jid = self.groupchat[room][nick]
if real_jid == own_jid:
continue
if not self.connections[account].are_keys_missing(real_jid):
missing = False
if missing:
log.debug('%s => No Trusted Fingerprints for %s',
account, room)
self.no_trusted_fingerprints_warning(chat_control)
else:
if self.connections[account].are_keys_missing(contact.jid):
log.debug('%s => No Trusted Fingerprints for %s',
account, contact.jid)
self.no_trusted_fingerprints_warning(chat_control)
chat_control.sendmessage = False
else:
log.debug('%s => Sending Message to %s',
account, contact.jid)
def new_fingerprints_available(self, chat_control):
jid = chat_control.contact.jid
account = chat_control.account
omemo = self.get_omemo(account)
if isinstance(chat_control, GroupchatControl):
room_jid = chat_control.room_jid
if room_jid in self.groupchat:
for nick in self.groupchat[room_jid]:
real_jid = self.groupchat[room_jid][nick]
fingerprints = omemo.store. \
getNewFingerprints(real_jid)
if fingerprints:
self.show_fingerprint_window(
chat_control, fingerprints)
elif not isinstance(chat_control, GroupchatControl):
fingerprints = omemo.store.getNewFingerprints(jid)
if fingerprints:
self.show_fingerprint_window(
chat_control, fingerprints)
def show_fingerprint_window(self, chat_control, fingerprints=None):
contact = chat_control.contact
account = chat_control.account
omemo = self.get_omemo(account)
transient = chat_control.parent_win.window
if 'dialog' not in self.windowinstances:
if isinstance(chat_control, GroupchatControl):
self.windowinstances['dialog'] = \
FingerprintWindow(self, contact, transient,
self.windowinstances, groupchat=True)
else:
self.windowinstances['dialog'] = \
FingerprintWindow(self, contact, transient,
self.windowinstances)
self.windowinstances['dialog'].show_all()
if fingerprints:
log.debug('%s => Showing Fingerprint Prompt for %s',
account, contact.jid)
omemo.store.setShownFingerprints(fingerprints)
else:
self.windowinstances['dialog'].update_context_list()
if fingerprints:
omemo.store.setShownFingerprints(fingerprints)
@staticmethod
def no_trusted_fingerprints_warning(chat_control):
msg = "To send an encrypted message, you have to " \
"first trust the fingerprint of your contact!"
chat_control.print_conversation_line(msg, 'status', '', None)
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