984 lines
37 KiB
Python
984 lines
37 KiB
Python
"""
|
||
|
||
This plugin implements `Off The Record messaging`_.
|
||
|
||
This is a plugin used to encrypt a one-to-one conversation using the OTR
|
||
encryption method. You can use it if you want good privacy, deniability,
|
||
authentication, and strong secrecy. Without this encryption, your messages
|
||
are encrypted **at least** from your client (poezio) to your server. The
|
||
message is decrypted by your server and you cannot control the encryption
|
||
method of your messages from your server to your contact’s server (unless
|
||
you are your own server’s administrator), nor from your contact’s server
|
||
to your contact’s client.
|
||
|
||
This plugin does end-to-end encryption. This means that **only** your contact can
|
||
decrypt your messages, and it is fully encrypted during **all** its travel
|
||
through the internet.
|
||
|
||
Note that if you are having an encrypted conversation with a contact, you can
|
||
**not** send XHTML-IM messages to them (or correct messages, or anything more than
|
||
raw text). All formatting will be removed and be replaced by plain text messages.
|
||
|
||
This is a limitation of the OTR protocol, and it will never be fixed. Some clients
|
||
like Pidgin-OTR try do do magic stuff with html unescaping inside the OTR body, and
|
||
it is not pretty.
|
||
|
||
Installation
|
||
------------
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||
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||
To use the OTR plugin, you must first install pure-python-otr and pycrypto
|
||
(for python3).
|
||
|
||
You have to install it from the git because a few issues were
|
||
found with the python3 compatibility while writing this plugin,
|
||
and the fixes did not make it into a stable release yet.
|
||
|
||
Install the python module:
|
||
|
||
.. code-block:: bash
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||
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||
git clone https://github.com/afflux/pure-python-otr.git
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||
cd pure-python-otr
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||
python3 setup.py install --user
|
||
|
||
You can also use pip in a virtualenv (built-in as pyvenv_ with python since 3.3)
|
||
with the requirements.txt at the root of the poezio directory.
|
||
|
||
|
||
Usage
|
||
-----
|
||
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||
Command added to Conversation Tabs and Private Tabs:
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||
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||
.. glossary::
|
||
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||
/otr
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||
**Usage:** ``/otr [start|refresh|end|fpr|ourfpr|trust|untrust]``
|
||
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||
This command is used to manage an OTR private session.
|
||
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||
- The ``start`` (or ``refresh``) command starts or refreshs a private OTR session
|
||
- The ``end`` command ends a private OTR session
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||
- The ``fpr`` command gives you the fingerprint of the key of the remote entity
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||
- The ``ourfpr`` command gives you the fingerprint of your own key
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||
- The ``trust`` command marks the current remote key as trusted for the current remote JID
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||
- The ``untrust`` command removes that trust
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||
- Finally, the ``drop`` command is used if you want to delete your private key (not recoverable).
|
||
|
||
.. warning::
|
||
|
||
With ``drop``, the private key is only removed from the filesystem,
|
||
*NOT* with multiple rewrites in a secure manner, you should do that
|
||
yourself if you want to be sure.
|
||
|
||
/otrsmp
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||
**Usage:** ``/otrsmp <ask|answer|abort> [question] [secret]``
|
||
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||
Verify the identify of your contact by using a pre-defined secret.
|
||
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||
- The ``abort`` command aborts an ongoing verification
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||
- The ``ask`` command start a verification, with a question or not
|
||
- The ``answer`` command sends back the answer and finishes the verification
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||
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||
Managing trust
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||
--------------
|
||
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||
An OTR conversation can be started with a simple ``/otr start`` and the
|
||
conversation will be encrypted. However it is very often useful to check
|
||
that your are talking to the right person.
|
||
|
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To this end, two actions are available, and a message explaining both
|
||
will be prompted each time an **untrusted** conversation is started:
|
||
|
||
- Checking the knowledge of a shared secret through the use of :term:`/otrsmp`
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||
- Exchanging fingerprints (``/otr fpr`` and ``/otr ourfpr``) out of band (in a secure channel) to check that both match,
|
||
then use ``/otr trust`` to add then to the list of trusted fingerprints for this JID.
|
||
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||
Files
|
||
-----
|
||
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||
This plugin creates trust files complatible with libotr and the files produced by gajim.
|
||
|
||
|
||
The files are located in :file:`$XDG_DATA_HOME/poezio/otr/` by default (so
|
||
:file:`~/.local/share/poezio/otr` in most cases).
|
||
|
||
Two files are created:
|
||
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- An account_jid.key3 (:file:`example@example.com.key3`) file, which contains the private key
|
||
- An account_jid.fpr (:file:`example@example.com.fpr`) file, which contains the list of trusted
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||
(or untrusted) JIDs and keys.
|
||
|
||
Configuration
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||
-------------
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||
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||
.. glossary::
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||
:sorted:
|
||
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||
decode_xhtml
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||
**Default:** ``true``
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||
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||
Decode embedded XHTML.
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||
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||
decode_entities
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||
**Default:** ``true``
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||
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||
Decode XML and HTML entities (like ``&``) even when the
|
||
document isn't valid (if it is valid, it will be decoded even
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||
without this option).
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||
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||
decode_newlines
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||
**Default:** ``true``
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||
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||
Decode ``<br/>`` and ``<br>`` tags even when the document
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||
isn't valid (if it is valid, it will be decoded even
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||
without this option for ``<br/>``, and ``<br>`` will make
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||
the document invalid anyway).
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||
|
||
keys_dir
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||
**Default:** ``$XDG_DATA_HOME/poezio/otr``
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||
|
||
The directory in which you want keys and fpr to be stored.
|
||
|
||
require_encryption
|
||
**Default:** ``false``
|
||
|
||
If ``true``, prevents you from sending unencrypted messages, and tries
|
||
to establish OTR sessions when receiving unencrypted messages.
|
||
|
||
timeout
|
||
**Default:** ``3``
|
||
|
||
The number of seconds poezio will wait until notifying you
|
||
that the OTR session was not established. A negative or null
|
||
value will disable this notification.
|
||
|
||
log
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||
**Default:** ``false``
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||
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||
Log conversations (OTR start/end marker, and messages).
|
||
|
||
The :term:`require_encryption`, :term:`decode_xhtml`, :term:`decode_entities`
|
||
and :term:`log` configuration parameters are tab-specific.
|
||
|
||
Important details
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||
-----------------
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||
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The OTR session is considered for a full JID (e.g. toto@example/**client1**),
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||
but the trust is set with a bare JID (e.g. toto@example). This is important
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||
in the case of Private Chats (in a chatroom), since you cannot always get the
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||
real JID of your contact (or check if the same nick is used by different people).
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||
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||
.. _Off The Record messaging: http://wiki.xmpp.org/web/OTR
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||
.. _pyvenv: https://docs.python.org/3/using/scripts.html#pyvenv-creating-virtual-environments
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||
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||
"""
|
||
|
||
from gettext import gettext as _
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||
import potr
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||
import logging
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||
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log = logging.getLogger(__name__)
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||
import os
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||
import html
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||
import curses
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||
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||
from potr.context import NotEncryptedError, UnencryptedMessage, ErrorReceived, NotOTRMessage,\
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||
STATE_ENCRYPTED, STATE_PLAINTEXT, STATE_FINISHED, Context, Account, crypt
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||
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||
from poezio import common
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||
from poezio import xhtml
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||
from poezio import xdg
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||
from poezio.common import safeJID
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||
from poezio.config import config
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||
from poezio.plugin import BasePlugin
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||
from poezio.tabs import ConversationTab, DynamicConversationTab, PrivateTab
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||
from poezio.theming import get_theme, dump_tuple
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||
from poezio.decorators import command_args_parser
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||
from poezio.core.structs import Completion
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||
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||
POLICY_FLAGS = {
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||
'ALLOW_V1':False,
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||
'ALLOW_V2':True,
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||
'REQUIRE_ENCRYPTION': False,
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||
'SEND_TAG': True,
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||
'WHITESPACE_START_AKE': True,
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||
'ERROR_START_AKE': True
|
||
}
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||
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||
log = logging.getLogger(__name__)
|
||
|
||
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||
OTR_TUTORIAL = _(
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||
"""%(info)sThis contact has not yet been verified.
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||
You have several methods of authentication available:
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||
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||
1) Verify each other's fingerprints using a secure (and different) channel:
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||
Your fingerprint: %(normal)s%(our_fpr)s%(info)s
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||
%(jid_c)s%(jid)s%(info)s's fingerprint: %(normal)s%(remote_fpr)s%(info)s
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||
Then use the command: /otr trust
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||
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||
2) SMP pre-shared secret you both know:
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||
/otrsmp ask <secret>
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||
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||
3) SMP pre-shared secret you both know with a question:
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||
/otrsmp ask <question> <secret>
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||
""")
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||
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||
OTR_NOT_ENABLED = _('%(jid_c)s%(jid)s%(info)s did not enable '
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||
'OTR after %(secs)s seconds.')
|
||
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||
MESSAGE_NOT_SENT = _('%(info)sYour message to %(jid_c)s%(jid)s%(info)s was'
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||
' not sent because your configuration requires an '
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||
'encrypted session.\nWait until it is established or '
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||
'change your configuration.')
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||
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||
OTR_REQUEST = _('%(info)sOTR request to %(jid_c)s%(jid)s%(info)s sent.')
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||
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||
OTR_OWN_FPR = _('%(info)sYour OTR key fingerprint is '
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||
'%(normal)s%(fpr)s%(info)s.')
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||
|
||
OTR_REMOTE_FPR = _('%(info)sThe key fingerprint for %(jid_c)s'
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||
'%(jid)s%(info)s is %(normal)s%(fpr)s%(info)s.')
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||
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||
OTR_NO_FPR = _('%(jid_c)s%(jid)s%(info)s has no'
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||
' key currently in use.')
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||
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||
OTR_START_TRUSTED = _('%(info)sStarted a \x19btrusted\x19o%(info)s '
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||
'OTR conversation with %(jid_c)s%(jid)s')
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||
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||
OTR_REFRESH_TRUSTED = _('%(info)sRefreshed \x19btrusted\x19o%(info)s'
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||
' OTR conversation with %(jid_c)s%(jid)s')
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||
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||
OTR_START_UNTRUSTED = _('%(info)sStarted an \x19buntrusted\x19o%(info)s'
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||
' OTR conversation with %(jid_c)s%(jid)s')
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||
|
||
OTR_REFRESH_UNTRUSTED = _('%(info)sRefreshed \x19buntrusted\x19o%(info)s'
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||
' OTR conversation with %(jid_c)s%(jid)s')
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||
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||
OTR_END = _('%(info)sEnded OTR conversation with %(jid_c)s%(jid)s')
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||
|
||
SMP_REQUESTED = _('%(jid_c)s%(jid)s%(info)s has requested SMP verification'
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||
'%(q)s%(info)s.\nAnswer with: /otrsmp answer <secret>')
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||
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||
SMP_INITIATED = _('%(info)sInitiated SMP request with '
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||
'%(jid_c)s%(jid)s%(info)s.')
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||
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||
SMP_PROGRESS = _('%(info)sSMP progressing.')
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||
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||
SMP_RECIPROCATE = _('%(info)sYou may want to authenticate your peer by asking'
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||
' your own question: /otrsmp ask [question] <secret>')
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||
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||
SMP_SUCCESS = _('%(info)sSMP Verification \x19bsucceeded\x19o%(info)s.')
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||
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||
SMP_FAIL = _('%(info)sSMP Verification \x19bfailed\x19o%(info)s.')
|
||
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||
SMP_ABORTED_PEER = _('%(info)sSMP aborted by peer.')
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||
|
||
SMP_ABORTED = _('%(info)sSMP aborted.')
|
||
|
||
MESSAGE_UNENCRYPTED = _('%(info)sThe following message from %(jid_c)s%(jid)s'
|
||
'%(info)s was \x19bnot\x19o%(info)s encrypted:\x19o\n'
|
||
'%(msg)s')
|
||
|
||
MESSAGE_UNREADABLE = _('%(info)sAn encrypted message from %(jid_c)s%(jid)s'
|
||
'%(info)s was received but is unreadable, as you are'
|
||
' not currently communicating privately.')
|
||
|
||
MESSAGE_INVALID = _('%(info)sThe message from %(jid_c)s%(jid)s%(info)s'
|
||
' could not be decrypted.')
|
||
|
||
OTR_ERROR = _('%(info)sReceived the following error from '
|
||
'%(jid_c)s%(jid)s%(info)s:\x19o %(err)s')
|
||
|
||
POTR_ERROR = _('%(info)sAn unspecified error in the OTR plugin occured:\n'
|
||
'%(exc)s')
|
||
|
||
TRUST_ADDED = _('%(info)sYou added %(jid_c)s%(bare_jid)s%(info)s with key '
|
||
'\x19o%(key)s%(info)s to your trusted list.')
|
||
|
||
|
||
TRUST_REMOVED = _('%(info)sYou removed %(jid_c)s%(bare_jid)s%(info)s with '
|
||
'key \x19o%(key)s%(info)s from your trusted list.')
|
||
|
||
KEY_DROPPED = _('%(info)sPrivate key dropped.')
|
||
|
||
def hl(tab):
|
||
"""
|
||
Make a tab beep and change its status.
|
||
"""
|
||
if tab.state != 'current':
|
||
tab.state = 'private'
|
||
|
||
conv_jid = safeJID(tab.name)
|
||
if 'private' in config.get('beep_on', 'highlight private').split():
|
||
if not config.get_by_tabname('disable_beep', conv_jid.bare, default=False):
|
||
curses.beep()
|
||
|
||
class PoezioContext(Context):
|
||
"""
|
||
OTR context, specific to a conversation with a contact
|
||
|
||
Overrides methods from potr.context.Context
|
||
"""
|
||
def __init__(self, account, peer, xmpp, core):
|
||
super(PoezioContext, self).__init__(account, peer)
|
||
self.xmpp = xmpp
|
||
self.core = core
|
||
self.flags = {}
|
||
self.trustName = safeJID(peer).bare
|
||
self.in_smp = False
|
||
self.smp_own = False
|
||
self.log = 0
|
||
|
||
def getPolicy(self, key):
|
||
if key in self.flags:
|
||
return self.flags[key]
|
||
else:
|
||
return False
|
||
|
||
def reset_smp(self):
|
||
self.in_smp = False
|
||
self.smp_own = False
|
||
|
||
def inject(self, msg, appdata=None):
|
||
message = self.xmpp.make_message(mto=self.peer,
|
||
mbody=msg.decode('ascii'),
|
||
mtype='chat')
|
||
message['eme']['namespace'] = 'urn:xmpp:otr:0'
|
||
message.enable('carbon_private')
|
||
message.enable('no-copy')
|
||
message.enable('no-permanent-store')
|
||
message.send()
|
||
|
||
def setState(self, newstate):
|
||
format_dict = {
|
||
'jid_c': '\x19%s}' % dump_tuple(get_theme().COLOR_MUC_JID),
|
||
'info': '\x19%s}' % dump_tuple(get_theme().COLOR_INFORMATION_TEXT),
|
||
'normal': '\x19%s}' % dump_tuple(get_theme().COLOR_NORMAL_TEXT),
|
||
'jid': self.peer,
|
||
'bare_jid': safeJID(self.peer).bare
|
||
}
|
||
|
||
tab = self.core.get_tab_by_name(self.peer)
|
||
if not tab:
|
||
tab = self.core.get_tab_by_name(safeJID(self.peer).bare,
|
||
DynamicConversationTab)
|
||
if tab and not tab.locked_resource == safeJID(self.peer).resource:
|
||
tab = None
|
||
if self.state == STATE_ENCRYPTED:
|
||
if newstate == STATE_ENCRYPTED and tab:
|
||
log.debug('OTR conversation with %s refreshed', self.peer)
|
||
if self.getCurrentTrust():
|
||
msg = OTR_REFRESH_TRUSTED % format_dict
|
||
tab.add_message(msg, typ=self.log)
|
||
else:
|
||
msg = OTR_REFRESH_UNTRUSTED % format_dict
|
||
tab.add_message(msg, typ=self.log)
|
||
hl(tab)
|
||
elif newstate == STATE_FINISHED or newstate == STATE_PLAINTEXT:
|
||
log.debug('OTR conversation with %s finished', self.peer)
|
||
if tab:
|
||
tab.add_message(OTR_END % format_dict, typ=self.log)
|
||
hl(tab)
|
||
elif newstate == STATE_ENCRYPTED and tab:
|
||
if self.getCurrentTrust():
|
||
tab.add_message(OTR_START_TRUSTED % format_dict, typ=self.log)
|
||
else:
|
||
format_dict['our_fpr'] = self.user.getPrivkey()
|
||
format_dict['remote_fpr'] = self.getCurrentKey()
|
||
tab.add_message(OTR_TUTORIAL % format_dict, typ=0)
|
||
tab.add_message(OTR_START_UNTRUSTED % format_dict, typ=self.log)
|
||
hl(tab)
|
||
|
||
log.debug('Set encryption state of %s to %s', self.peer, states[newstate])
|
||
super(PoezioContext, self).setState(newstate)
|
||
if tab:
|
||
self.core.refresh_window()
|
||
self.core.doupdate()
|
||
|
||
class PoezioAccount(Account):
|
||
"""
|
||
OTR Account, keeps track of a specific account (ours)
|
||
|
||
Redefines the load/save methods from potr.context.Account
|
||
"""
|
||
|
||
def __init__(self, jid, key_dir):
|
||
super(PoezioAccount, self).__init__(jid, 'xmpp', 0)
|
||
self.key_dir = os.path.join(key_dir, jid)
|
||
|
||
def load_privkey(self):
|
||
try:
|
||
with open(self.key_dir + '.key3', 'rb') as keyfile:
|
||
return potr.crypt.PK.parsePrivateKey(keyfile.read())[0]
|
||
except:
|
||
log.error('Error in load_privkey', exc_info=True)
|
||
|
||
def drop_privkey(self):
|
||
try:
|
||
os.remove(self.key_dir + '.key3')
|
||
except:
|
||
log.exception('Error in drop_privkey (removing %s)', self.key_dir + '.key3')
|
||
self.privkey = None
|
||
|
||
def save_privkey(self):
|
||
try:
|
||
with open(self.key_dir + '.key3', 'xb') as keyfile:
|
||
keyfile.write(self.getPrivkey().serializePrivateKey())
|
||
except:
|
||
log.error('Error in save_privkey', exc_info=True)
|
||
|
||
def load_trusts(self):
|
||
try:
|
||
with open(self.key_dir + '.fpr', 'r') as fpr_fd:
|
||
for line in fpr_fd:
|
||
ctx, acc, proto, fpr, trust = line[:-1].split('\t')
|
||
|
||
if acc != self.name or proto != 'xmpp':
|
||
continue
|
||
jid = safeJID(ctx).bare
|
||
if not jid:
|
||
continue
|
||
self.setTrust(jid, fpr, trust)
|
||
except:
|
||
log.error('Error in load_trusts', exc_info=True)
|
||
|
||
def save_trusts(self):
|
||
try:
|
||
with open(self.key_dir + '.fpr', 'w') as fpr_fd:
|
||
for uid, trusts in self.trusts.items():
|
||
for fpr, trustVal in trusts.items():
|
||
fpr_fd.write('\t'.join((uid, self.name, 'xmpp', fpr, trustVal)))
|
||
fpr_fd.write('\n')
|
||
except:
|
||
log.exception('Error in save_trusts', exc_info=True)
|
||
|
||
saveTrusts = save_trusts
|
||
loadTrusts = load_trusts
|
||
loadPrivkey = load_privkey
|
||
savePrivkey = save_privkey
|
||
|
||
states = {
|
||
STATE_PLAINTEXT: 'plaintext',
|
||
STATE_ENCRYPTED: 'encrypted',
|
||
STATE_FINISHED: 'finished',
|
||
}
|
||
|
||
class Plugin(BasePlugin):
|
||
|
||
def init(self):
|
||
# set the default values from the config
|
||
keys_dir = self.config.get('keys_dir', '')
|
||
otr_dir = Path(keys_dir).expanduser() if keys_dir else xdg.DATA_HOME / 'otr'
|
||
try:
|
||
otr_dir.mkdir(parents=True, exists_ok=True)
|
||
except OSError as e:
|
||
self.api.information('The OTR-specific folder could not '
|
||
'be created: %s. Poezio will be unable '
|
||
'to save keys and trusts' % e, 'OTR')
|
||
|
||
except:
|
||
self.api.information('The OTR-specific folder could not '
|
||
'be created. Poezio will be unable '
|
||
'to save keys and trusts', 'OTR')
|
||
|
||
self.api.add_event_handler('conversation_msg', self.on_conversation_msg)
|
||
self.api.add_event_handler('private_msg', self.on_conversation_msg)
|
||
self.api.add_event_handler('conversation_say_after', self.on_conversation_say)
|
||
self.api.add_event_handler('private_say_after', self.on_conversation_say)
|
||
|
||
ConversationTab.add_information_element('otr', self.display_encryption_status)
|
||
PrivateTab.add_information_element('otr', self.display_encryption_status)
|
||
|
||
self.core.xmpp.plugin['xep_0030'].add_feature('urn:xmpp:otr:0')
|
||
|
||
self.account = PoezioAccount(self.core.xmpp.boundjid.bare, otr_dir)
|
||
self.account.load_trusts()
|
||
self.contexts = {}
|
||
usage = '<start|refresh|end|fpr|ourfpr|drop|trust|untrust>'
|
||
shortdesc = 'Manage an OTR conversation'
|
||
desc = ('Manage an OTR conversation.\n'
|
||
'start/refresh: Start or refresh a conversation\n'
|
||
'end: End a conversation\n'
|
||
'fpr: Show the fingerprint of the key of the remote user\n'
|
||
'ourfpr: Show the fingerprint of your own key\n'
|
||
'drop: Remove the current key (FOREVER)\n'
|
||
'trust: Set this key for this contact as trusted\n'
|
||
'untrust: Remove the trust for the key of this contact\n')
|
||
smp_usage = '<abort|ask|answer> [question] [answer]'
|
||
smp_short = 'Identify a contact'
|
||
smp_desc = ('Verify the identify of your contact by using a pre-defined secret.\n'
|
||
'abort: Abort an ongoing verification\n'
|
||
'ask: Start a verification, with a question or not\n'
|
||
'answer: Finish a verification\n')
|
||
|
||
self.api.add_tab_command(ConversationTab, 'otrsmp', self.command_smp,
|
||
help=smp_desc, usage=smp_usage, short=smp_short,
|
||
completion=self.completion_smp)
|
||
self.api.add_tab_command(PrivateTab, 'otrsmp', self.command_smp,
|
||
help=smp_desc, usage=smp_usage, short=smp_short,
|
||
completion=self.completion_smp)
|
||
|
||
self.api.add_tab_command(ConversationTab, 'otr', self.command_otr,
|
||
help=desc, usage=usage, short=shortdesc,
|
||
completion=self.completion_otr)
|
||
self.api.add_tab_command(PrivateTab, 'otr', self.command_otr,
|
||
help=desc, usage=usage, short=shortdesc,
|
||
completion=self.completion_otr)
|
||
|
||
def cleanup(self):
|
||
for context in self.contexts.values():
|
||
context.disconnect()
|
||
|
||
self.core.xmpp.plugin['xep_0030'].del_feature(feature='urn:xmpp:otr:0')
|
||
|
||
ConversationTab.remove_information_element('otr')
|
||
PrivateTab.remove_information_element('otr')
|
||
|
||
def get_context(self, jid):
|
||
"""
|
||
Retrieve or create an OTR context
|
||
"""
|
||
jid = safeJID(jid)
|
||
if jid.full not in self.contexts:
|
||
flags = POLICY_FLAGS.copy()
|
||
require = self.config.get_by_tabname('require_encryption',
|
||
jid.bare, default=False)
|
||
flags['REQUIRE_ENCRYPTION'] = require
|
||
logging_policy = self.config.get_by_tabname('log', jid.bare , default=False)
|
||
self.contexts[jid.full] = PoezioContext(self.account, jid.full, self.core.xmpp, self.core)
|
||
self.contexts[jid.full].log = 1 if logging_policy else 0
|
||
self.contexts[jid.full].flags = flags
|
||
return self.contexts[jid.full]
|
||
|
||
def on_conversation_msg(self, msg, tab):
|
||
"""
|
||
Message received
|
||
"""
|
||
format_dict = {
|
||
'jid_c': '\x19%s}' % dump_tuple(get_theme().COLOR_MUC_JID),
|
||
'info': '\x19%s}' % dump_tuple(get_theme().COLOR_INFORMATION_TEXT),
|
||
'jid': msg['from']
|
||
}
|
||
try:
|
||
ctx = self.get_context(msg['from'])
|
||
txt, tlvs = ctx.receiveMessage(msg["body"].encode('utf-8'))
|
||
|
||
# SMP
|
||
if tlvs:
|
||
self.handle_tlvs(tlvs, ctx, tab, format_dict)
|
||
except UnencryptedMessage as err:
|
||
# received an unencrypted message inside an OTR session
|
||
self.unencrypted_message_received(err, ctx, msg, tab, format_dict)
|
||
self.otr_start(tab, tab.name, format_dict)
|
||
return
|
||
except NotOTRMessage as err:
|
||
# ignore non-otr messages
|
||
# if we expected an OTR message, we would have
|
||
# got an UnencryptedMesssage
|
||
# but do an additional check because of a bug with potr and py3k
|
||
if ctx.state != STATE_PLAINTEXT or ctx.getPolicy('REQUIRE_ENCRYPTION'):
|
||
self.unencrypted_message_received(err, ctx, msg, tab, format_dict)
|
||
self.otr_start(tab, tab.name, format_dict)
|
||
return
|
||
except ErrorReceived as err:
|
||
# Received an OTR error
|
||
format_dict['err'] = err.args[0].error.decode('utf-8', errors='replace')
|
||
tab.add_message(OTR_ERROR % format_dict, typ=0)
|
||
del msg['body']
|
||
del msg['html']
|
||
hl(tab)
|
||
self.core.refresh_window()
|
||
return
|
||
except NotEncryptedError as err:
|
||
# Encrypted message received, but unreadable as we do not have
|
||
# an OTR session in place.
|
||
text = MESSAGE_UNREADABLE % format_dict
|
||
tab.add_message(text, jid=msg['from'], typ=0)
|
||
hl(tab)
|
||
del msg['body']
|
||
del msg['html']
|
||
self.core.refresh_window()
|
||
return
|
||
except crypt.InvalidParameterError:
|
||
# Malformed OTR payload and stuff
|
||
text = MESSAGE_INVALID % format_dict
|
||
tab.add_message(text, jid=msg['from'], typ=0)
|
||
hl(tab)
|
||
del msg['body']
|
||
del msg['html']
|
||
self.core.refresh_window()
|
||
return
|
||
except Exception:
|
||
# Unexpected error
|
||
import traceback
|
||
exc = traceback.format_exc()
|
||
format_dict['exc'] = exc
|
||
tab.add_message(POTR_ERROR % format_dict, typ=0)
|
||
log.error('Unspecified error in the OTR plugin', exc_info=True)
|
||
return
|
||
# No error, proceed with the message
|
||
self.encrypted_message_received(msg, ctx, tab, txt)
|
||
|
||
def handle_tlvs(self, tlvs, ctx, tab, format_dict):
|
||
"""
|
||
If the message had a TLV, it means we received part of an SMP
|
||
exchange.
|
||
"""
|
||
smp1q = get_tlv(tlvs, potr.proto.SMP1QTLV)
|
||
smp1 = get_tlv(tlvs, potr.proto.SMP1TLV)
|
||
smp2 = get_tlv(tlvs, potr.proto.SMP2TLV)
|
||
smp3 = get_tlv(tlvs, potr.proto.SMP3TLV)
|
||
smp4 = get_tlv(tlvs, potr.proto.SMP4TLV)
|
||
abort = get_tlv(tlvs, potr.proto.SMPABORTTLV)
|
||
if abort:
|
||
ctx.reset_smp()
|
||
tab.add_message(SMP_ABORTED_PEER % format_dict, typ=0)
|
||
elif ctx.in_smp and not ctx.smpIsValid():
|
||
ctx.reset_smp()
|
||
tab.add_message(SMP_ABORTED % format_dict, typ=0)
|
||
elif smp1 or smp1q:
|
||
# Received an SMP request (with a question or not)
|
||
if smp1q:
|
||
try:
|
||
question = ' with question: \x19o' + smp1q.msg.decode('utf-8')
|
||
except UnicodeDecodeError:
|
||
self.api.information('The peer sent a question but it had a wrong encoding', 'Error')
|
||
question = ''
|
||
else:
|
||
question = ''
|
||
ctx.in_smp = True
|
||
# we did not initiate it
|
||
ctx.smp_own = False
|
||
format_dict['q'] = question
|
||
tab.add_message(SMP_REQUESTED % format_dict, typ=0)
|
||
elif smp2:
|
||
# SMP reply received
|
||
if not ctx.in_smp:
|
||
ctx.reset_smp()
|
||
else:
|
||
tab.add_message(SMP_PROGRESS % format_dict, typ=0)
|
||
elif smp3 or smp4:
|
||
# Type 4 (SMP message 3) or 5 (SMP message 4) TLVs received
|
||
# in both cases it is the final message of the SMP exchange
|
||
if ctx.smpIsSuccess():
|
||
tab.add_message(SMP_SUCCESS % format_dict, typ=0)
|
||
if not ctx.getCurrentTrust():
|
||
tab.add_message(SMP_RECIPROCATE % format_dict, typ=0)
|
||
else:
|
||
tab.add_message(SMP_FAIL % format_dict, typ=0)
|
||
ctx.reset_smp()
|
||
hl(tab)
|
||
self.core.refresh_window()
|
||
|
||
def unencrypted_message_received(self, err, ctx, msg, tab, format_dict):
|
||
"""
|
||
An unencrypted message was received while we expected it to be
|
||
encrypted. Display it with a warning.
|
||
"""
|
||
format_dict['msg'] = err.args[0].decode('utf-8')
|
||
text = MESSAGE_UNENCRYPTED % format_dict
|
||
tab.add_message(text, jid=msg['from'], typ=ctx.log)
|
||
del msg['body']
|
||
del msg['html']
|
||
hl(tab)
|
||
self.core.refresh_window()
|
||
|
||
def encrypted_message_received(self, msg, ctx, tab, txt):
|
||
"""
|
||
A properly encrypted message was received, so we add it to the
|
||
buffer, and try to format it according to the configuration.
|
||
"""
|
||
# remove xhtml
|
||
del msg['html']
|
||
del msg['body']
|
||
|
||
if not txt:
|
||
return
|
||
if isinstance(tab, PrivateTab):
|
||
user = tab.parent_muc.get_user_by_name(msg['from'].resource)
|
||
nick_color = None
|
||
else:
|
||
user = None
|
||
nick_color = get_theme().COLOR_REMOTE_USER
|
||
|
||
body = txt.decode()
|
||
decode_entities = self.config.get_by_tabname('decode_entities',
|
||
msg['from'].bare,
|
||
default=True)
|
||
decode_newlines = self.config.get_by_tabname('decode_newlines',
|
||
msg['from'].bare,
|
||
default=True)
|
||
if self.config.get_by_tabname('decode_xhtml', msg['from'].bare, default=True):
|
||
try:
|
||
body = xhtml.xhtml_to_poezio_colors(body, force=True)
|
||
except Exception:
|
||
if decode_entities:
|
||
body = html.unescape(body)
|
||
if decode_newlines:
|
||
body = body.replace('<br/>', '\n').replace('<br>', '\n')
|
||
else:
|
||
if decode_entities:
|
||
body = html.unescape(body)
|
||
if decode_newlines:
|
||
body = body.replace('<br/>', '\n').replace('<br>', '\n')
|
||
tab.add_message(body, nickname=tab.nick, jid=msg['from'],
|
||
forced_user=user, typ=ctx.log,
|
||
nick_color=nick_color)
|
||
hl(tab)
|
||
self.core.refresh_window()
|
||
del msg['body']
|
||
|
||
def find_encrypted_context_with_matching(self, bare_jid):
|
||
"""
|
||
Find an OTR session from a bare JID.
|
||
|
||
Useful when a dynamic tab unlocks, which would lead to sending
|
||
unencrypted messages until it locks again, if we didn’t fallback
|
||
with this.
|
||
"""
|
||
for ctx in self.contexts:
|
||
if safeJID(ctx).bare == bare_jid and self.contexts[ctx].state == STATE_ENCRYPTED:
|
||
return self.contexts[ctx]
|
||
return None
|
||
|
||
def on_conversation_say(self, msg, tab):
|
||
"""
|
||
On message sent
|
||
"""
|
||
if isinstance(tab, DynamicConversationTab) and tab.locked_resource:
|
||
jid = safeJID(tab.name)
|
||
jid.resource = tab.locked_resource
|
||
name = jid.full
|
||
else:
|
||
name = tab.name
|
||
jid = safeJID(tab.name)
|
||
|
||
format_dict = {
|
||
'jid_c': '\x19%s}' % dump_tuple(get_theme().COLOR_MUC_JID),
|
||
'info': '\x19%s}' % dump_tuple(get_theme().COLOR_INFORMATION_TEXT),
|
||
'jid': name,
|
||
}
|
||
|
||
ctx = None
|
||
default_ctx = self.get_context(name)
|
||
|
||
if isinstance(tab, DynamicConversationTab) and not tab.locked_resource:
|
||
log.debug('Unlocked tab %s found, falling back to the first encrypted chat we find.', name)
|
||
ctx = self.find_encrypted_context_with_matching(jid.bare)
|
||
|
||
if ctx is None:
|
||
ctx = default_ctx
|
||
|
||
if ctx and ctx.state == STATE_ENCRYPTED:
|
||
ctx.sendMessage(0, msg['body'].encode('utf-8'))
|
||
if not tab.send_chat_state('active'):
|
||
tab.send_chat_state('inactive', always_send=True)
|
||
|
||
tab.add_message(msg['body'],
|
||
nickname=self.core.own_nick or tab.own_nick,
|
||
nick_color=get_theme().COLOR_OWN_NICK,
|
||
identifier=msg['id'],
|
||
jid=self.core.xmpp.boundjid,
|
||
typ=ctx.log)
|
||
# remove everything from the message so that it doesn’t get sent
|
||
del msg['body']
|
||
del msg['replace']
|
||
del msg['html']
|
||
elif ctx and ctx.getPolicy('REQUIRE_ENCRYPTION'):
|
||
tab.add_message(MESSAGE_NOT_SENT % format_dict, typ=0)
|
||
del msg['body']
|
||
del msg['replace']
|
||
del msg['html']
|
||
self.otr_start(tab, name, format_dict)
|
||
|
||
def display_encryption_status(self, jid):
|
||
"""
|
||
Returns the text to display in the infobar (the OTR status)
|
||
"""
|
||
context = self.get_context(jid)
|
||
if safeJID(jid).bare == jid and context.state != STATE_ENCRYPTED:
|
||
ctx = self.find_encrypted_context_with_matching(jid)
|
||
if ctx:
|
||
context = ctx
|
||
state = states[context.state]
|
||
trust = 'trusted' if context.getCurrentTrust() else 'untrusted'
|
||
|
||
return ' OTR: %s (%s)' % (state, trust)
|
||
|
||
def command_otr(self, arg):
|
||
"""
|
||
/otr [start|refresh|end|fpr|ourfpr]
|
||
"""
|
||
args = common.shell_split(arg)
|
||
if not args:
|
||
return self.core.command.help('otr')
|
||
action = args.pop(0)
|
||
tab = self.api.current_tab()
|
||
name = tab.name
|
||
if isinstance(tab, DynamicConversationTab) and tab.locked_resource:
|
||
name = safeJID(tab.name)
|
||
name.resource = tab.locked_resource
|
||
name = name.full
|
||
format_dict = {
|
||
'jid_c': '\x19%s}' % dump_tuple(get_theme().COLOR_MUC_JID),
|
||
'info': '\x19%s}' % dump_tuple(get_theme().COLOR_INFORMATION_TEXT),
|
||
'normal': '\x19%s}' % dump_tuple(get_theme().COLOR_NORMAL_TEXT),
|
||
'jid': name,
|
||
'bare_jid': safeJID(name).bare
|
||
}
|
||
|
||
if action == 'end': # close the session
|
||
context = self.get_context(name)
|
||
context.disconnect()
|
||
if isinstance(tab, DynamicConversationTab):
|
||
ctx = self.find_encrypted_context_with_matching(safeJID(name).bare)
|
||
while ctx is not None:
|
||
ctx.disconnect()
|
||
ctx = self.find_encrypted_context_with_matching(safeJID(name).bare)
|
||
elif action == 'start' or action == 'refresh':
|
||
self.otr_start(tab, name, format_dict)
|
||
elif action == 'ourfpr':
|
||
format_dict['fpr'] = self.account.getPrivkey()
|
||
tab.add_message(OTR_OWN_FPR % format_dict, typ=0)
|
||
elif action == 'fpr':
|
||
if name in self.contexts:
|
||
ctx = self.contexts[name]
|
||
if ctx.getCurrentKey() is not None:
|
||
format_dict['fpr'] = ctx.getCurrentKey()
|
||
tab.add_message(OTR_REMOTE_FPR % format_dict, typ=0)
|
||
else:
|
||
tab.add_message(OTR_NO_FPR % format_dict, typ=0)
|
||
elif action == 'drop':
|
||
# drop the privkey (and obviously, end the current conversations before that)
|
||
for context in self.contexts.values():
|
||
if context.state not in (STATE_FINISHED, STATE_PLAINTEXT):
|
||
context.disconnect()
|
||
self.account.drop_privkey()
|
||
tab.add_message(KEY_DROPPED % format_dict, typ=0)
|
||
elif action == 'trust':
|
||
ctx = self.get_context(name)
|
||
key = ctx.getCurrentKey()
|
||
if key:
|
||
fpr = key.cfingerprint()
|
||
else:
|
||
return
|
||
if not ctx.getCurrentTrust():
|
||
format_dict['key'] = key
|
||
ctx.setTrust(fpr, 'verified')
|
||
self.account.saveTrusts()
|
||
tab.add_message(TRUST_ADDED % format_dict, typ=0)
|
||
elif action == 'untrust':
|
||
ctx = self.get_context(name)
|
||
key = ctx.getCurrentKey()
|
||
if key:
|
||
fpr = key.cfingerprint()
|
||
else:
|
||
return
|
||
if ctx.getCurrentTrust():
|
||
format_dict['key'] = key
|
||
ctx.setTrust(fpr, '')
|
||
self.account.saveTrusts()
|
||
tab.add_message(TRUST_REMOVED % format_dict, typ=0)
|
||
self.core.refresh_window()
|
||
|
||
def otr_start(self, tab, name, format_dict):
|
||
"""
|
||
Start an otr conversation with a contact
|
||
"""
|
||
secs = self.config.get('timeout', 3)
|
||
def notify_otr_timeout():
|
||
tab_name = tab.name
|
||
otr = self.get_context(tab_name)
|
||
if isinstance(tab, DynamicConversationTab):
|
||
if tab.locked_resource:
|
||
tab_name = safeJID(tab.name)
|
||
tab_name.resource = tab.locked_resource
|
||
tab_name = tab_name.full
|
||
otr = self.get_context(tab_name)
|
||
if otr.state != STATE_ENCRYPTED:
|
||
format_dict['secs'] = secs
|
||
text = OTR_NOT_ENABLED % format_dict
|
||
tab.add_message(text, typ=0)
|
||
self.core.refresh_window()
|
||
if secs > 0:
|
||
event = self.api.create_delayed_event(secs, notify_otr_timeout)
|
||
self.api.add_timed_event(event)
|
||
body = self.get_context(name).sendMessage(0, b'?OTRv?').decode()
|
||
self.core.xmpp.send_message(mto=name, mtype='chat', mbody=body)
|
||
tab.add_message(OTR_REQUEST % format_dict, typ=0)
|
||
|
||
@staticmethod
|
||
def completion_otr(the_input):
|
||
"""
|
||
Completion for /otr
|
||
"""
|
||
comp = ['start', 'fpr', 'ourfpr', 'refresh', 'end', 'trust', 'untrust']
|
||
return Completion(the_input.new_completion, comp, 1, quotify=False)
|
||
|
||
@command_args_parser.quoted(1, 2)
|
||
def command_smp(self, args):
|
||
"""
|
||
/otrsmp <ask|answer|abort> [question] [secret]
|
||
"""
|
||
if args is None or not args:
|
||
return self.core.command.help('otrsmp')
|
||
length = len(args)
|
||
action = args.pop(0)
|
||
if length == 2:
|
||
question = None
|
||
secret = args.pop(0).encode('utf-8')
|
||
elif length == 3:
|
||
question = args.pop(0).encode('utf-8')
|
||
secret = args.pop(0).encode('utf-8')
|
||
else:
|
||
question = secret = None
|
||
|
||
tab = self.api.current_tab()
|
||
name = tab.name
|
||
if isinstance(tab, DynamicConversationTab) and tab.locked_resource:
|
||
name = safeJID(tab.name)
|
||
name.resource = tab.locked_resource
|
||
name = name.full
|
||
|
||
format_dict = {
|
||
'jid_c': '\x19%s}' % dump_tuple(get_theme().COLOR_MUC_JID),
|
||
'info': '\x19%s}' % dump_tuple(get_theme().COLOR_INFORMATION_TEXT),
|
||
'jid': name,
|
||
'bare_jid': safeJID(name).bare
|
||
}
|
||
|
||
ctx = self.get_context(name)
|
||
if ctx.state != STATE_ENCRYPTED:
|
||
self.api.information('The current conversation is not encrypted',
|
||
'Error')
|
||
return
|
||
|
||
if action == 'ask':
|
||
ctx.in_smp = True
|
||
ctx.smp_own = True
|
||
if question:
|
||
ctx.smpInit(secret, question)
|
||
else:
|
||
ctx.smpInit(secret)
|
||
tab.add_message(SMP_INITIATED % format_dict, typ=0)
|
||
elif action == 'answer':
|
||
ctx.smpGotSecret(secret)
|
||
elif action == 'abort':
|
||
if ctx.in_smp:
|
||
ctx.smpAbort()
|
||
tab.add_message(SMP_ABORTED % format_dict, typ=0)
|
||
self.core.refresh_window()
|
||
|
||
@staticmethod
|
||
def completion_smp(the_input):
|
||
"""Completion for /otrsmp"""
|
||
if the_input.get_argument_position() == 1:
|
||
return Completion(the_input.new_completion, ['ask', 'answer', 'abort'], 1, quotify=False)
|
||
|
||
def get_tlv(tlvs, cls):
|
||
"""Find the instance of a class in a list"""
|
||
for tlv in tlvs:
|
||
if isinstance(tlv, cls):
|
||
return tlv
|