- Now support all Gajim versions — from 1.0.3 to 1.1.99 (trunk) - Added python3-potr library to otrplugin distribution (it does not have external dependencies) - Code restructurized and reworked (again...) Fixes: - Now we will create OTR Instance only once for account - Fixed crash when we failed to get window control (chat is closed i.e.) - Will not break MAM and conferences anymore New: - XHTML support - Errors notifications as well as status changes - Retransmit last message after OTR channel init - Correct close all active OTR channels when going offline Wontfix: - I still love you. Always and Forever ♥dev
annelin
5 years ago
parent
01ba08cb4a
commit
a05f8c4bf1
@ -1,9 +1,9 @@
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[info]
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name: otrplugin
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short_name: otrplugin
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version: 0.2
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version: 0.3
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description: Off-the-Record encryption
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authors: Pavel R <pd@narayana.im>
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homepage: https://dev.narayana.im/gajim-otrplugin
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min_gajim_version: 1.1
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max_gajim_version: 1.3
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min_gajim_version: 1.0.3
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max_gajim_version: 1.1.99
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@ -0,0 +1,27 @@
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# Copyright 2011-2012 Kjell Braden <afflux@pentabarf.de>
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#
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# This file is part of the python-potr library.
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#
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# python-potr is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# any later version.
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#
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# python-potr is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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# some python3 compatibilty
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from __future__ import unicode_literals
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from potr import context
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from potr import proto
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from potr.utils import human_hash
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''' version is: (major, minor, patch, sub) with sub being one of 'alpha',
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'beta', 'final' '''
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VERSION = (1, 0, 3, 'alpha')
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@ -0,0 +1,21 @@
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# Copyright 2012 Kjell Braden <afflux@pentabarf.de>
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#
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# This file is part of the python-potr library.
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#
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# python-potr is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# any later version.
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#
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# python-potr is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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from potr.compatcrypto.common import *
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from potr.compatcrypto.pycrypto import *
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# Copyright 2012 Kjell Braden <afflux@pentabarf.de>
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#
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# This file is part of the python-potr library.
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#
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# python-potr is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# any later version.
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#
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# python-potr is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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# some python3 compatibilty
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from __future__ import unicode_literals
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import logging
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import struct
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from potr.utils import human_hash, bytes_to_long, unpack, pack_mpi
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DEFAULT_KEYTYPE = 0x0000
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pkTypes = {}
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def registerkeytype(cls):
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if cls.keyType is None:
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raise TypeError('registered key class needs a type value')
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pkTypes[cls.keyType] = cls
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return cls
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def generateDefaultKey():
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return pkTypes[DEFAULT_KEYTYPE].generate()
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class PK(object):
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keyType = None
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@classmethod
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def generate(cls):
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raise NotImplementedError
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@classmethod
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def parsePayload(cls, data, private=False):
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raise NotImplementedError
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def sign(self, data):
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raise NotImplementedError
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def verify(self, data):
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raise NotImplementedError
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def fingerprint(self):
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raise NotImplementedError
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def serializePublicKey(self):
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return struct.pack(b'!H', self.keyType) \
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+ self.getSerializedPublicPayload()
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def getSerializedPublicPayload(self):
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buf = b''
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for x in self.getPublicPayload():
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buf += pack_mpi(x)
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return buf
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def getPublicPayload(self):
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raise NotImplementedError
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def serializePrivateKey(self):
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return struct.pack(b'!H', self.keyType) \
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+ self.getSerializedPrivatePayload()
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def getSerializedPrivatePayload(self):
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buf = b''
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for x in self.getPrivatePayload():
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buf += pack_mpi(x)
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return buf
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def getPrivatePayload(self):
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raise NotImplementedError
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def cfingerprint(self):
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return '{0:040x}'.format(bytes_to_long(self.fingerprint()))
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@classmethod
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def parsePrivateKey(cls, data):
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implCls, data = cls.getImplementation(data)
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logging.debug('Got privkey of type %r', implCls)
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return implCls.parsePayload(data, private=True)
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@classmethod
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def parsePublicKey(cls, data):
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implCls, data = cls.getImplementation(data)
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logging.debug('Got pubkey of type %r', implCls)
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return implCls.parsePayload(data)
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def __str__(self):
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return human_hash(self.cfingerprint())
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def __repr__(self):
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return '<{cls}(fpr=\'{fpr}\')>'.format(
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cls=self.__class__.__name__, fpr=str(self))
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@staticmethod
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def getImplementation(data):
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typeid, data = unpack(b'!H', data)
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cls = pkTypes.get(typeid, None)
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if cls is None:
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raise NotImplementedError('unknown typeid %r' % typeid)
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return cls, data
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@ -0,0 +1,149 @@
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# Copyright 2012 Kjell Braden <afflux@pentabarf.de>
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#
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# This file is part of the python-potr library.
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#
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# python-potr is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# any later version.
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#
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# python-potr is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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try:
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import Crypto
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except ImportError:
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import crypto as Crypto
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from Crypto import Cipher
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from Crypto.Hash import SHA256 as _SHA256
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from Crypto.Hash import SHA as _SHA1
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from Crypto.Hash import HMAC as _HMAC
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from Crypto.PublicKey import DSA
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import Crypto.Random.random
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from numbers import Number
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from potr.compatcrypto import common
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from potr.utils import read_mpi, bytes_to_long, long_to_bytes
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def SHA256(data):
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return _SHA256.new(data).digest()
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def SHA1(data):
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return _SHA1.new(data).digest()
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def SHA1HMAC(key, data):
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return _HMAC.new(key, msg=data, digestmod=_SHA1).digest()
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def SHA256HMAC(key, data):
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return _HMAC.new(key, msg=data, digestmod=_SHA256).digest()
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def AESCTR(key, counter=0):
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if isinstance(counter, Number):
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counter = Counter(counter)
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if not isinstance(counter, Counter):
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raise TypeError
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return Cipher.AES.new(key, Cipher.AES.MODE_CTR, counter=counter)
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class Counter(object):
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def __init__(self, prefix):
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self.prefix = prefix
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self.val = 0
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def inc(self):
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self.prefix += 1
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self.val = 0
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def __setattr__(self, attr, val):
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if attr == 'prefix':
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self.val = 0
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super(Counter, self).__setattr__(attr, val)
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def __repr__(self):
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return '<Counter(p={p!r},v={v!r})>'.format(p=self.prefix, v=self.val)
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def byteprefix(self):
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return long_to_bytes(self.prefix, 8)
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def __call__(self):
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bytesuffix = long_to_bytes(self.val, 8)
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self.val += 1
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return self.byteprefix() + bytesuffix
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@common.registerkeytype
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class DSAKey(common.PK):
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keyType = 0x0000
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def __init__(self, key=None, private=False):
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self.priv = self.pub = None
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if not isinstance(key, tuple):
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raise TypeError('4/5-tuple required for key')
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if len(key) == 5 and private:
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self.priv = DSA.construct(key)
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self.pub = self.priv.publickey()
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elif len(key) == 4 and not private:
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self.pub = DSA.construct(key)
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else:
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raise TypeError('wrong number of arguments for ' \
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'private={0!r}: got {1} '
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.format(private, len(key)))
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def getPublicPayload(self):
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return (self.pub.p, self.pub.q, self.pub.g, self.pub.y)
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def getPrivatePayload(self):
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return (self.priv.p, self.priv.q, self.priv.g, self.priv.y, self.priv.x)
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def fingerprint(self):
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return SHA1(self.getSerializedPublicPayload())
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def sign(self, data):
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# 2 <= K <= q
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K = randrange(2, self.priv.q)
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r, s = self.priv.sign(data, K)
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return long_to_bytes(r, 20) + long_to_bytes(s, 20)
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def verify(self, data, sig):
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r, s = bytes_to_long(sig[:20]), bytes_to_long(sig[20:])
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return self.pub.verify(data, (r, s))
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def __hash__(self):
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return bytes_to_long(self.fingerprint())
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def __eq__(self, other):
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if not isinstance(other, type(self)):
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return False
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return self.fingerprint() == other.fingerprint()
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def __ne__(self, other):
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return not (self == other)
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@classmethod
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def generate(cls):
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privkey = DSA.generate(1024)
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return cls((privkey.key.y, privkey.key.g, privkey.key.p, privkey.key.q,
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privkey.key.x), private=True)
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@classmethod
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def parsePayload(cls, data, private=False):
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p, data = read_mpi(data)
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q, data = read_mpi(data)
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g, data = read_mpi(data)
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y, data = read_mpi(data)
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if private:
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x, data = read_mpi(data)
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return cls((y, g, p, q, x), private=True), data
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return cls((y, g, p, q), private=False), data
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def getrandbits(k):
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return Crypto.Random.random.getrandbits(k)
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def randrange(start, stop):
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return Crypto.Random.random.randrange(start, stop)
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@ -0,0 +1,574 @@
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# Copyright 2011-2012 Kjell Braden <afflux@pentabarf.de>
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#
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# This file is part of the python-potr library.
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#
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# python-potr is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# any later version.
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#
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# python-potr is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||||
# GNU Lesser General Public License for more details.
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||||
#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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# some python3 compatibilty
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from __future__ import unicode_literals
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try:
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type(basestring)
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except NameError:
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# all strings are unicode in python3k
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basestring = str
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unicode = str
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# callable is not available in python 3.0 and 3.1
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try:
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type(callable)
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except NameError:
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from collections import Callable
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def callable(x):
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return isinstance(x, Callable)
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import base64
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import logging
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import struct
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logger = logging.getLogger(__name__)
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from potr import crypt
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from potr import proto
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from potr import compatcrypto
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from time import time
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EXC_UNREADABLE_MESSAGE = 1
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EXC_FINISHED = 2
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HEARTBEAT_INTERVAL = 60
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STATE_PLAINTEXT = 0
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STATE_ENCRYPTED = 1
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STATE_FINISHED = 2
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FRAGMENT_SEND_ALL = 0
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FRAGMENT_SEND_ALL_BUT_FIRST = 1
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FRAGMENT_SEND_ALL_BUT_LAST = 2
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OFFER_NOTSENT = 0
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OFFER_SENT = 1
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OFFER_REJECTED = 2
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OFFER_ACCEPTED = 3
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class Context(object):
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def __init__(self, account, peername):
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self.user = account
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self.peer = peername
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self.policy = {}
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self.crypto = crypt.CryptEngine(self)
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self.tagOffer = OFFER_NOTSENT
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self.mayRetransmit = 0
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self.lastSend = 0
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self.lastMessage = None
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self.state = STATE_PLAINTEXT
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self.trustName = self.peer
|
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|
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self.fragmentInfo = None
|
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self.fragment = None
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self.discardFragment()
|
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def getPolicy(self, key):
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raise NotImplementedError
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|
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def inject(self, msg, appdata=None):
|
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raise NotImplementedError
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|
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def policyOtrEnabled(self):
|
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return self.getPolicy('ALLOW_V2') or self.getPolicy('ALLOW_V1')
|
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|
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def discardFragment(self):
|
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self.fragmentInfo = (0, 0)
|
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self.fragment = []
|
||||
|
||||
def fragmentAccumulate(self, message):
|
||||
'''Accumulate a fragmented message. Returns None if the fragment is
|
||||
to be ignored, returns a string if the message is ready for further
|
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processing'''
|
||||
|
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params = message.split(b',')
|
||||
if len(params) < 5 or not params[1].isdigit() or not params[2].isdigit():
|
||||
logger.warning('invalid formed fragmented message: %r', params)
|
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self.discardFragment()
|
||||
return message
|
||||
|
||||
|
||||
K, N = self.fragmentInfo
|
||||
try:
|
||||
k = int(params[1])
|
||||
n = int(params[2])
|
||||
except ValueError:
|
||||
logger.warning('invalid formed fragmented message: %r', params)
|
||||
self.discardFragment()
|
||||
return message
|
||||
|
||||
fragData = params[3]
|
||||
|
||||
logger.debug(params)
|
||||
|
||||
if n >= k == 1:
|
||||
# first fragment
|
||||
self.discardFragment()
|
||||
self.fragmentInfo = (k, n)
|
||||
self.fragment.append(fragData)
|
||||
elif N == n >= k > 1 and k == K+1:
|
||||
# accumulate
|
||||
self.fragmentInfo = (k, n)
|
||||
self.fragment.append(fragData)
|
||||
else:
|
||||
# bad, discard
|
||||
self.discardFragment()
|
||||
logger.warning('invalid fragmented message: %r', params)
|
||||
return message
|
||||
|
||||
if n == k > 0:
|
||||
assembled = b''.join(self.fragment)
|
||||
self.discardFragment()
|
||||
return assembled
|
||||
|
||||
return None
|
||||
|
||||
def removeFingerprint(self, fingerprint):
|
||||
self.user.removeFingerprint(self.trustName, fingerprint)
|
||||
|
||||
def setTrust(self, fingerprint, trustLevel):
|
||||
''' sets the trust level for the given fingerprint.
|
||||
trust is usually:
|
||||
- the empty string for known but untrusted keys
|
||||
- 'verified' for manually verified keys
|
||||
- 'smp' for smp-style verified keys '''
|
||||
self.user.setTrust(self.trustName, fingerprint, trustLevel)
|
||||
|
||||
def getTrust(self, fingerprint, default=None):
|
||||
return self.user.getTrust(self.trustName, fingerprint, default)
|
||||
|
||||
def setCurrentTrust(self, trustLevel):
|
||||
self.setTrust(self.crypto.theirPubkey.cfingerprint(), trustLevel)
|
||||
|
||||
def getCurrentKey(self):
|
||||
return self.crypto.theirPubkey
|
||||
|
||||
def getCurrentTrust(self):
|
||||
''' returns a 2-tuple: first element is the current fingerprint,
|
||||
second is:
|
||||
- None if the key is unknown yet
|
||||
- a non-empty string if the key is trusted
|
||||
- an empty string if the key is untrusted '''
|
||||
if self.crypto.theirPubkey is None:
|
||||
return None
|
||||
return self.getTrust(self.crypto.theirPubkey.cfingerprint(), None)
|
||||
|
||||
def receiveMessage(self, messageData, appdata=None):
|
||||
IGN = None, []
|
||||
|
||||
if not self.policyOtrEnabled():
|
||||
raise NotOTRMessage(messageData)
|
||||
|
||||
message = self.parse(messageData)
|
||||
|
||||
if message is None:
|
||||
# nothing to see. move along.
|
||||
return IGN
|
||||
|
||||
logger.debug(repr(message))
|
||||
|
||||
if self.getPolicy('SEND_TAG'):
|
||||
if isinstance(message, basestring):
|
||||
# received a plaintext message without tag
|
||||
# we should not tag anymore
|
||||
self.tagOffer = OFFER_REJECTED
|
||||
else:
|
||||
# got something OTR-ish, cool!
|
||||
self.tagOffer = OFFER_ACCEPTED
|
||||
|
||||
if isinstance(message, proto.Query):
|
||||
self.handleQuery(message, appdata=appdata)
|
||||
|
||||
if isinstance(message, proto.TaggedPlaintext):
|
||||
# it's actually a plaintext message
|
||||
if self.state != STATE_PLAINTEXT or \
|
||||
self.getPolicy('REQUIRE_ENCRYPTION'):
|
||||
# but we don't want plaintexts
|
||||
raise UnencryptedMessage(message.msg)
|
||||
|
||||
raise NotOTRMessage(message.msg)
|
||||
|
||||
return IGN
|
||||
|
||||
if isinstance(message, proto.AKEMessage):
|
||||
self.crypto.handleAKE(message, appdata=appdata)
|
||||
return IGN
|
||||
|
||||
if isinstance(message, proto.DataMessage):
|
||||
ignore = message.flags & proto.MSGFLAGS_IGNORE_UNREADABLE
|
||||
|
||||
if self.state != STATE_ENCRYPTED:
|
||||
self.sendInternal(proto.Error(
|
||||
'You sent encrypted data, but I wasn\'t expecting it.'
|
||||
.encode('utf-8')), appdata=appdata)
|
||||
if ignore:
|
||||
return IGN
|
||||
raise NotEncryptedError(EXC_UNREADABLE_MESSAGE)
|
||||
|
||||
try:
|
||||
plaintext, tlvs = self.crypto.handleDataMessage(message)
|
||||
self.processTLVs(tlvs, appdata=appdata)
|
||||
if plaintext and self.lastSend < time() - HEARTBEAT_INTERVAL:
|
||||
self.sendInternal(b'', appdata=appdata)
|
||||
return plaintext or None, tlvs
|
||||
except crypt.InvalidParameterError:
|
||||
if ignore:
|
||||
return IGN
|
||||
logger.exception('decryption failed')
|
||||
raise
|
||||
if isinstance(message, basestring):
|
||||
if self.state != STATE_PLAINTEXT or \
|
||||
self.getPolicy('REQUIRE_ENCRYPTION'):
|
||||
raise UnencryptedMessage(message)
|
||||
|
||||
if isinstance(message, proto.Error):
|
||||
raise ErrorReceived(message)
|
||||
|
||||
raise NotOTRMessage(messageData)
|
||||
|
||||
def sendInternal(self, msg, tlvs=[], appdata=None):
|
||||
self.sendMessage(FRAGMENT_SEND_ALL, msg, tlvs=tlvs, appdata=appdata,
|
||||
flags=proto.MSGFLAGS_IGNORE_UNREADABLE)
|
||||
|
||||
def sendMessage(self, sendPolicy, msg, flags=0, tlvs=[], appdata=None):
|
||||
if self.policyOtrEnabled():
|
||||
self.lastSend = time()
|
||||
|
||||
if isinstance(msg, proto.OTRMessage):
|
||||
# we want to send a protocol message (probably internal)
|
||||
# so we don't need further protocol encryption
|
||||
# also we can't add TLVs to arbitrary protocol messages
|
||||
if tlvs:
|
||||
raise TypeError('can\'t add tlvs to protocol message')
|
||||
else:
|
||||
# we got plaintext to send. encrypt it
|
||||
msg = self.processOutgoingMessage(msg, flags, tlvs)
|
||||
|
||||
if isinstance(msg, proto.OTRMessage) \
|
||||
and not isinstance(msg, proto.Query):
|
||||
# if it's a query message, it must not get fragmented
|
||||
return self.sendFragmented(bytes(msg), policy=sendPolicy, appdata=appdata)
|
||||
else:
|
||||
msg = bytes(msg)
|
||||
return msg
|
||||
|
||||
def processOutgoingMessage(self, msg, flags, tlvs=[]):
|
||||
isQuery = self.parseExplicitQuery(msg) is not None
|
||||
if isQuery:
|
||||
return self.user.getDefaultQueryMessage(self.getPolicy)
|
||||
|
||||
if self.state == STATE_PLAINTEXT:
|
||||
if self.getPolicy('REQUIRE_ENCRYPTION'):
|
||||
if not isQuery:
|
||||
self.lastMessage = msg
|
||||
self.lastSend = time()
|
||||
self.mayRetransmit = 2
|
||||
# TODO notify
|
||||
msg = self.user.getDefaultQueryMessage(self.getPolicy)
|
||||
return msg
|
||||
if self.getPolicy('SEND_TAG') and \
|
||||
self.tagOffer != OFFER_REJECTED and \
|
||||
self.shouldTagMessage(msg):
|
||||
self.tagOffer = OFFER_SENT
|
||||
versions = set()
|
||||
if self.getPolicy('ALLOW_V1'):
|
||||
versions.add(1)
|
||||
if self.getPolicy('ALLOW_V2'):
|
||||
versions.add(2)
|
||||
return proto.TaggedPlaintext(msg, versions)
|
||||
return msg
|
||||
if self.state == STATE_ENCRYPTED:
|
||||
msg = self.crypto.createDataMessage(msg, flags, tlvs)
|
||||
self.lastSend = time()
|
||||
return msg
|
||||
if self.state == STATE_FINISHED:
|
||||
raise NotEncryptedError(EXC_FINISHED)
|
||||
|
||||
def disconnect(self, appdata=None):
|
||||
if self.state != STATE_FINISHED:
|
||||
self.sendInternal(b'', tlvs=[proto.DisconnectTLV()], appdata=appdata)
|
||||
self.setState(STATE_PLAINTEXT)
|
||||
self.crypto.finished()
|
||||
else:
|
||||
self.setState(STATE_PLAINTEXT)
|
||||
|
||||
def setState(self, newstate):
|
||||
self.state = newstate
|
||||
|
||||
def _wentEncrypted(self):
|
||||
self.setState(STATE_ENCRYPTED)
|
||||
|
||||
def sendFragmented(self, msg, policy=FRAGMENT_SEND_ALL, appdata=None):
|
||||
mms = self.maxMessageSize(appdata)
|
||||
msgLen = len(msg)
|
||||
if mms != 0 and msgLen > mms:
|
||||
fms = mms - 19
|
||||
fragments = [ msg[i:i+fms] for i in range(0, msgLen, fms) ]
|
||||
|
||||
fc = len(fragments)
|
||||
|
||||
if fc > 65535:
|
||||
raise OverflowError('too many fragments')
|
||||
|
||||
for fi in range(len(fragments)):
|
||||
ctr = unicode(fi+1) + ',' + unicode(fc) + ','
|
||||
fragments[fi] = b'?OTR,' + ctr.encode('ascii') \
|
||||
+ fragments[fi] + b','
|
||||
|
||||
if policy == FRAGMENT_SEND_ALL:
|
||||
for f in fragments:
|
||||
self.inject(f, appdata=appdata)
|
||||
return None
|
||||
elif policy == FRAGMENT_SEND_ALL_BUT_FIRST:
|
||||
for f in fragments[1:]:
|
||||
self.inject(f, appdata=appdata)
|
||||
return fragments[0]
|
||||
elif policy == FRAGMENT_SEND_ALL_BUT_LAST:
|
||||
for f in fragments[:-1]:
|
||||
self.inject(f, appdata=appdata)
|
||||
return fragments[-1]
|
||||
|
||||
else:
|
||||
if policy == FRAGMENT_SEND_ALL:
|
||||
self.inject(msg, appdata=appdata)
|
||||
return None
|
||||
else:
|
||||
return msg
|
||||
|
||||
def processTLVs(self, tlvs, appdata=None):
|
||||
for tlv in tlvs:
|
||||
if isinstance(tlv, proto.DisconnectTLV):
|
||||
logger.info('got disconnect tlv, forcing finished state')
|
||||
self.setState(STATE_FINISHED)
|
||||
self.crypto.finished()
|
||||
# TODO cleanup
|
||||
continue
|
||||
if isinstance(tlv, proto.SMPTLV):
|
||||
self.crypto.smpHandle(tlv, appdata=appdata)
|
||||
continue
|
||||
logger.info('got unhandled tlv: {0!r}'.format(tlv))
|
||||
|
||||
def smpAbort(self, appdata=None):
|
||||
if self.state != STATE_ENCRYPTED:
|
||||
raise NotEncryptedError
|
||||
self.crypto.smpAbort(appdata=appdata)
|
||||
|
||||
def smpIsValid(self):
|
||||
return self.crypto.smp and self.crypto.smp.prog != crypt.SMPPROG_CHEATED
|
||||
|
||||
def smpIsSuccess(self):
|
||||
return self.crypto.smp.prog == crypt.SMPPROG_SUCCEEDED \
|
||||
if self.crypto.smp else None
|
||||
|
||||
def smpGotSecret(self, secret, question=None, appdata=None):
|
||||
if self.state != STATE_ENCRYPTED:
|
||||
raise NotEncryptedError
|
||||
self.crypto.smpSecret(secret, question=question, appdata=appdata)
|
||||
|
||||
def smpInit(self, secret, question=None, appdata=None):
|
||||
if self.state != STATE_ENCRYPTED:
|
||||
raise NotEncryptedError
|
||||
self.crypto.smp = None
|
||||
self.crypto.smpSecret(secret, question=question, appdata=appdata)
|
||||
|
||||
def handleQuery(self, message, appdata=None):
|
||||
if 2 in message.versions and self.getPolicy('ALLOW_V2'):
|
||||
self.authStartV2(appdata=appdata)
|
||||
elif 1 in message.versions and self.getPolicy('ALLOW_V1'):
|
||||
self.authStartV1(appdata=appdata)
|
||||
|
||||
def authStartV1(self, appdata=None):
|
||||
raise NotImplementedError()
|
||||
|
||||
def authStartV2(self, appdata=None):
|
||||
self.crypto.startAKE(appdata=appdata)
|
||||
|
||||
def parseExplicitQuery(self, message):
|
||||
otrTagPos = message.find(proto.OTRTAG)
|
||||
|
||||
if otrTagPos == -1:
|
||||
return None
|
||||
|
||||
indexBase = otrTagPos + len(proto.OTRTAG)
|
||||
|
||||
if len(message) <= indexBase:
|
||||
return None
|
||||
|
||||
compare = message[indexBase]
|
||||
|
||||
hasq = compare == b'?'[0]
|
||||
hasv = compare == b'v'[0]
|
||||
|
||||
if not hasq and not hasv:
|
||||
return None
|
||||
|
||||
hasv |= len(message) > indexBase+1 and message[indexBase+1] == b'v'[0]
|
||||
if hasv:
|
||||
end = message.find(b'?', indexBase+1)
|
||||
else:
|
||||
end = indexBase+1
|
||||
return message[indexBase:end]
|
||||
|
||||
def parse(self, message, nofragment=False):
|
||||
otrTagPos = message.find(proto.OTRTAG)
|
||||
if otrTagPos == -1:
|
||||
if proto.MESSAGE_TAG_BASE in message:
|
||||
return proto.TaggedPlaintext.parse(message)
|
||||
else:
|
||||
return message
|
||||
|
||||
indexBase = otrTagPos + len(proto.OTRTAG)
|
||||
|
||||
if len(message) <= indexBase:
|
||||
return message
|
||||
|
||||
compare = message[indexBase]
|
||||
|
||||
if nofragment is False and compare == b','[0]:
|
||||
message = self.fragmentAccumulate(message[indexBase:])
|
||||
if message is None:
|
||||
return None
|
||||
else:
|
||||
return self.parse(message, nofragment=True)
|
||||
else:
|
||||
self.discardFragment()
|
||||
|
||||
queryPayload = self.parseExplicitQuery(message)
|
||||
if queryPayload is not None:
|
||||
return proto.Query.parse(queryPayload)
|
||||
|
||||
if compare == b':'[0] and len(message) > indexBase + 4:
|
||||
try:
|
||||
infoTag = base64.b64decode(message[indexBase+1:indexBase+5])
|
||||
classInfo = struct.unpack(b'!HB', infoTag)
|
||||
|
||||
cls = proto.messageClasses.get(classInfo, None)
|
||||
if cls is None:
|
||||
return message
|
||||
|
||||
logger.debug('{user} got msg {typ!r}' \
|
||||
.format(user=self.user.name, typ=cls))
|
||||
return cls.parsePayload(message[indexBase+5:])
|
||||
except (TypeError, struct.error):
|
||||
logger.exception('could not parse OTR message %s', message)
|
||||
return message
|
||||
|
||||
if message[indexBase:indexBase+7] == b' Error:':
|
||||
return proto.Error(message[indexBase+7:])
|
||||
|
||||
return message
|
||||
|
||||
def maxMessageSize(self, appdata=None):
|
||||
"""Return the max message size for this context."""
|
||||
return self.user.maxMessageSize
|
||||
|
||||
def getExtraKey(self, extraKeyAppId=None, extraKeyAppData=None, appdata=None):
|
||||
""" retrieves the generated extra symmetric key.
|
||||
|
||||
if extraKeyAppId is set, notifies the chat partner about intended
|
||||
usage (additional application specific information can be supplied in
|
||||
extraKeyAppData).
|
||||
|
||||
returns the 256 bit symmetric key """
|
||||
|
||||
if self.state != STATE_ENCRYPTED:
|
||||
raise NotEncryptedError
|
||||
if extraKeyAppId is not None:
|
||||
tlvs = [proto.ExtraKeyTLV(extraKeyAppId, extraKeyAppData)]
|
||||
self.sendInternal(b'', tlvs=tlvs, appdata=appdata)
|
||||
return self.crypto.extraKey
|
||||
|
||||
def shouldTagMessage(self, msg):
|
||||
"""Hook to decide whether to tag a message based on its contents."""
|
||||
return True
|
||||
|
||||
class Account(object):
|
||||
contextclass = Context
|
||||
def __init__(self, name, protocol, maxMessageSize, privkey=None):
|
||||
self.name = name
|
||||
self.privkey = privkey
|
||||
self.policy = {}
|
||||
self.protocol = protocol
|
||||
self.ctxs = {}
|
||||
self.trusts = {}
|
||||
self.maxMessageSize = maxMessageSize
|
||||
self.defaultQuery = '?OTRv{versions}?\nI would like to start ' \
|
||||
'an Off-the-Record private conversation. However, you ' \
|
||||
'do not have a plugin to support that.\nSee '\
|
||||
'https://otr.cypherpunks.ca/ for more information.'
|
||||
|
||||
def __repr__(self):
|
||||
return '<{cls}(name={name!r})>'.format(cls=self.__class__.__name__,
|
||||
name=self.name)
|
||||
|
||||
def getPrivkey(self, autogen=True):
|
||||
if self.privkey is None:
|
||||
self.privkey = self.loadPrivkey()
|
||||
if self.privkey is None:
|
||||
if autogen is True:
|
||||
self.privkey = compatcrypto.generateDefaultKey()
|
||||
self.savePrivkey()
|
||||
else:
|
||||
raise LookupError
|
||||
return self.privkey
|
||||
|
||||
def loadPrivkey(self):
|
||||
raise NotImplementedError
|
||||
|
||||
def savePrivkey(self):
|
||||
raise NotImplementedError
|
||||
|
||||
def saveTrusts(self):
|
||||
raise NotImplementedError
|
||||
|
||||
def getContext(self, uid, newCtxCb=None):
|
||||
if uid not in self.ctxs:
|
||||
self.ctxs[uid] = self.contextclass(self, uid)
|
||||
if callable(newCtxCb):
|
||||
newCtxCb(self.ctxs[uid])
|
||||
return self.ctxs[uid]
|
||||
|
||||
def getDefaultQueryMessage(self, policy):
|
||||
v = '2' if policy('ALLOW_V2') else ''
|
||||
msg = self.defaultQuery.format(versions=v)
|
||||
return msg.encode('ascii')
|
||||
|
||||
def setTrust(self, key, fingerprint, trustLevel):
|
||||
if key not in self.trusts:
|
||||
self.trusts[key] = {}
|
||||
self.trusts[key][fingerprint] = trustLevel
|
||||
self.saveTrusts()
|
||||
|
||||
def getTrust(self, key, fingerprint, default=None):
|
||||
if key not in self.trusts:
|
||||
return default
|
||||
return self.trusts[key].get(fingerprint, default)
|
||||
|
||||
def removeFingerprint(self, key, fingerprint):
|
||||
if key in self.trusts and fingerprint in self.trusts[key]:
|
||||
del self.trusts[key][fingerprint]
|
||||
|
||||
class NotEncryptedError(RuntimeError):
|
||||
pass
|
||||
class UnencryptedMessage(RuntimeError):
|
||||
pass
|
||||
class ErrorReceived(RuntimeError):
|
||||
pass
|
||||
class NotOTRMessage(RuntimeError):
|
||||
pass
|
||||
@ -0,0 +1,801 @@
|
||||
# Copyright 2011-2012 Kjell Braden <afflux@pentabarf.de>
|
||||
#
|
||||
# This file is part of the python-potr library.
|
||||
#
|
||||
# python-potr is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU Lesser General Public License as published by
|
||||
# the Free Software Foundation; either version 3 of the License, or
|
||||
# any later version.
|
||||
#
|
||||
# python-potr 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 Lesser General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU Lesser General Public License
|
||||
# along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
# some python3 compatibilty
|
||||
from __future__ import unicode_literals
|
||||
|
||||
import logging
|
||||
import struct
|
||||
|
||||
|
||||
from potr.compatcrypto import SHA256, SHA1, SHA1HMAC, SHA256HMAC, \
|
||||
Counter, AESCTR, PK, getrandbits, randrange
|
||||
from potr.utils import bytes_to_long, long_to_bytes, pack_mpi, read_mpi
|
||||
from potr import proto
|
||||
|
||||
logger = logging.getLogger(__name__)
|
||||
|
||||
STATE_NONE = 0
|
||||
STATE_AWAITING_DHKEY = 1
|
||||
STATE_AWAITING_REVEALSIG = 2
|
||||
STATE_AWAITING_SIG = 4
|
||||
STATE_V1_SETUP = 5
|
||||
|
||||
|
||||
DH_MODULUS = 2410312426921032588552076022197566074856950548502459942654116941958108831682612228890093858261341614673227141477904012196503648957050582631942730706805009223062734745341073406696246014589361659774041027169249453200378729434170325843778659198143763193776859869524088940195577346119843545301547043747207749969763750084308926339295559968882457872412993810129130294592999947926365264059284647209730384947211681434464714438488520940127459844288859336526896320919633919
|
||||
DH_MODULUS_2 = DH_MODULUS-2
|
||||
DH_GENERATOR = 2
|
||||
DH_BITS = 1536
|
||||
DH_MAX = 2**DH_BITS
|
||||
SM_ORDER = (DH_MODULUS - 1) // 2
|
||||
|
||||
def check_group(n):
|
||||
return 2 <= n <= DH_MODULUS_2
|
||||
def check_exp(n):
|
||||
return 1 <= n < SM_ORDER
|
||||
|
||||
def SHA256HMAC160(key, data):
|
||||
return SHA256HMAC(key, data)[:20]
|
||||
|
||||
class DH(object):
|
||||
@classmethod
|
||||
def set_params(cls, prime, gen):
|
||||
cls.prime = prime
|
||||
cls.gen = gen
|
||||
|
||||
def __init__(self):
|
||||
self.priv = randrange(2, 2**320)
|
||||
self.pub = pow(self.gen, self.priv, self.prime)
|
||||
|
||||
DH.set_params(DH_MODULUS, DH_GENERATOR)
|
||||
|
||||
class DHSession(object):
|
||||
def __init__(self, sendenc, sendmac, rcvenc, rcvmac):
|
||||
self.sendenc = sendenc
|
||||
self.sendmac = sendmac
|
||||
self.rcvenc = rcvenc
|
||||
self.rcvmac = rcvmac
|
||||
self.sendctr = Counter(0)
|
||||
self.rcvctr = Counter(0)
|
||||
self.sendmacused = False
|
||||
self.rcvmacused = False
|
||||
|
||||
def __repr__(self):
|
||||
return '<{cls}(send={s!r},rcv={r!r})>' \
|
||||
.format(cls=self.__class__.__name__,
|
||||
s=self.sendmac, r=self.rcvmac)
|
||||
|
||||
@classmethod
|
||||
def create(cls, dh, y):
|
||||
s = pow(y, dh.priv, DH_MODULUS)
|
||||
sb = pack_mpi(s)
|
||||
|
||||
if dh.pub > y:
|
||||
sendbyte = b'\1'
|
||||
rcvbyte = b'\2'
|
||||
else:
|
||||
sendbyte = b'\2'
|
||||
rcvbyte = b'\1'
|
||||
|
||||
sendenc = SHA1(sendbyte + sb)[:16]
|
||||
sendmac = SHA1(sendenc)
|
||||
rcvenc = SHA1(rcvbyte + sb)[:16]
|
||||
rcvmac = SHA1(rcvenc)
|
||||
return cls(sendenc, sendmac, rcvenc, rcvmac)
|
||||