409 lines
17 KiB
Python
409 lines
17 KiB
Python
# This file is part of Gajim.
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#
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# Gajim is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published
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# by the Free Software Foundation; version 3 only.
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#
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# Gajim 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
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"""
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Handles Jingle File Transfer (XEP 0234)
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"""
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import hashlib
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import logging
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import os
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import threading
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from enum import IntEnum, unique
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import nbxmpp
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from gajim.common import app
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from gajim.common import configpaths
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from gajim.common import jingle_xtls
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from gajim.common.jingle_content import contents, JingleContent
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from gajim.common.jingle_transport import JingleTransportSocks5, TransportType
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from gajim.common import helpers
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from gajim.common.connection_handlers_events import FileRequestReceivedEvent
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from gajim.common.jingle_ftstates import (
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StateInitialized, StateCandSent, StateCandReceived, StateTransfering,
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StateCandSentAndRecv, StateTransportReplace)
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log = logging.getLogger('gajim.c.jingle_ft')
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@unique
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class State(IntEnum):
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NOT_STARTED = 0
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INITIALIZED = 1
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# We send the candidates and we are waiting for a reply
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CAND_SENT = 2
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# We received the candidates and we are waiting to reply
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CAND_RECEIVED = 3
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# We have sent and received the candidates
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# This also includes any candidate-error received or sent
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CAND_SENT_AND_RECEIVED = 4
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TRANSPORT_REPLACE = 5
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# We are transfering the file
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TRANSFERING = 6
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class JingleFileTransfer(JingleContent):
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def __init__(self, session, transport=None, file_props=None,
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use_security=False, senders=None):
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JingleContent.__init__(self, session, transport, senders)
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log.info("transport value: %s", transport)
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# events we might be interested in
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self.callbacks['session-initiate'] += [self.__on_session_initiate]
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self.callbacks['session-initiate-sent'] += [
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self.__on_session_initiate_sent]
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self.callbacks['content-add'] += [self.__on_session_initiate]
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self.callbacks['session-accept'] += [self.__on_session_accept]
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self.callbacks['session-terminate'] += [self.__on_session_terminate]
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self.callbacks['session-info'] += [self.__on_session_info]
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self.callbacks['transport-accept'] += [self.__on_transport_accept]
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self.callbacks['transport-replace'] += [self.__on_transport_replace]
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self.callbacks['session-accept-sent'] += [self.__transport_setup]
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# fallback transport method
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self.callbacks['transport-reject'] += [self.__on_transport_reject]
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self.callbacks['transport-info'] += [self.__on_transport_info]
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self.callbacks['iq-result'] += [self.__on_iq_result]
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self.use_security = use_security
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self.x509_fingerprint = None
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self.file_props = file_props
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self.weinitiate = self.session.weinitiate
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self.werequest = self.session.werequest
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if self.file_props is not None:
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if self.session.werequest:
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self.file_props.sender = self.session.peerjid
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self.file_props.receiver = self.session.ourjid
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else:
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self.file_props.sender = self.session.ourjid
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self.file_props.receiver = self.session.peerjid
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self.file_props.session_type = 'jingle'
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self.file_props.sid = session.sid
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self.file_props.transfered_size = []
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self.file_props.transport_sid = self.transport.sid
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log.info("FT request: %s", file_props)
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if transport is None:
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self.transport = JingleTransportSocks5()
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self.transport.set_connection(session.connection)
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self.transport.set_file_props(self.file_props)
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self.transport.set_our_jid(session.ourjid)
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log.info('ourjid: %s', session.ourjid)
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self.session = session
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self.media = 'file'
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self.nominated_cand = {}
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if app.contacts.is_gc_contact(session.connection.name,
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session.peerjid):
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roomjid = session.peerjid.split('/')[0]
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dstaddr = hashlib.sha1(('%s%s%s' % (self.file_props.sid,
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session.ourjid, roomjid))
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.encode('utf-8')).hexdigest()
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self.file_props.dstaddr = dstaddr
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self.state = State.NOT_STARTED
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self.states = {
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State.INITIALIZED : StateInitialized(self),
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State.CAND_SENT : StateCandSent(self),
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State.CAND_RECEIVED : StateCandReceived(self),
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State.TRANSFERING : StateTransfering(self),
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State.TRANSPORT_REPLACE : StateTransportReplace(self),
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State.CAND_SENT_AND_RECEIVED : StateCandSentAndRecv(self)
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}
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if jingle_xtls.PYOPENSSL_PRESENT:
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cert_name = os.path.join(configpaths.get('MY_CERT'),
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jingle_xtls.SELF_SIGNED_CERTIFICATE)
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if not (os.path.exists(cert_name + '.cert')
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and os.path.exists(cert_name + '.pkey')):
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jingle_xtls.make_certs(cert_name, 'gajim')
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def __state_changed(self, nextstate, args=None):
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# Executes the next state action and sets the next state
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current_state = self.state
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st = self.states[nextstate]
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st.action(args)
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# state can have been changed during the action. Don't go back.
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if self.state == current_state:
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self.state = nextstate
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def __on_session_initiate(self, stanza, content, error, action):
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log.debug("Jingle FT request received")
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app.nec.push_incoming_event(FileRequestReceivedEvent(None,
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conn=self.session.connection,
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stanza=stanza,
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jingle_content=content,
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FT_content=self))
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if self.session.request:
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# accept the request
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self.session.approve_content(self.media, self.name)
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self.session.accept_session()
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def __on_session_initiate_sent(self, stanza, content, error, action):
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pass
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def __send_hash(self):
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# Send hash in a session info
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checksum = nbxmpp.Node(tag='checksum',
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payload=[nbxmpp.Node(tag='file',
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payload=[self._compute_hash()])])
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checksum.setNamespace(nbxmpp.NS_JINGLE_FILE_TRANSFER_5)
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self.session.__session_info(checksum)
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pjid = app.get_jid_without_resource(self.session.peerjid)
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file_info = {'name' : self.file_props.name,
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'file-name' : self.file_props.file_name,
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'hash' : self.file_props.hash_,
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'size' : self.file_props.size,
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'date' : self.file_props.date,
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'peerjid' : pjid
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}
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self.session.connection.set_file_info(file_info)
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def _compute_hash(self):
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# Caculates the hash and returns a xep-300 hash stanza
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if self.file_props.algo is None:
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return
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try:
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file_ = open(self.file_props.file_name, 'rb')
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except IOError:
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# can't open file
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return
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h = nbxmpp.Hashes2()
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hash_ = h.calculateHash(self.file_props.algo, file_)
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file_.close()
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# DEBUG
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#hash_ = '1294809248109223'
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if not hash_:
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# Hash alogrithm not supported
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return
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self.file_props.hash_ = hash_
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h.addHash(hash_, self.file_props.algo)
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return h
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def on_cert_received(self):
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self.session.approve_session()
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self.session.approve_content('file', name=self.name)
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def __on_session_accept(self, stanza, content, error, action):
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log.info("__on_session_accept")
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con = self.session.connection
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security = content.getTag('security')
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if not security: # responder can not verify our fingerprint
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self.use_security = False
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else:
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fingerprint = security.getTag('fingerprint')
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if fingerprint:
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fingerprint = fingerprint.getData()
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self.x509_fingerprint = fingerprint
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if not jingle_xtls.check_cert(app.get_jid_without_resource(
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self.session.responder), fingerprint):
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id_ = jingle_xtls.send_cert_request(con,
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self.session.responder)
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jingle_xtls.key_exchange_pend(id_,
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self.continue_session_accept,
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[stanza])
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raise nbxmpp.NodeProcessed
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self.continue_session_accept(stanza)
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def continue_session_accept(self, stanza):
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if self.state == State.TRANSPORT_REPLACE:
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# If we are requesting we don't have the file
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if self.session.werequest:
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raise nbxmpp.NodeProcessed
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# We send the file
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self.__state_changed(State.TRANSFERING)
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raise nbxmpp.NodeProcessed
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self.file_props.streamhosts = self.transport.remote_candidates
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# Calculate file hash in a new thread
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# if we haven't sent the hash already.
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if self.file_props.hash_ is None and self.file_props.algo and \
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not self.werequest:
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self.hash_thread = threading.Thread(target=self.__send_hash)
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self.hash_thread.start()
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for host in self.file_props.streamhosts:
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host['initiator'] = self.session.initiator
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host['target'] = self.session.responder
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host['sid'] = self.file_props.sid
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fingerprint = None
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if self.use_security:
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fingerprint = 'client'
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if self.transport.type_ == TransportType.SOCKS5:
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sid = self.file_props.transport_sid
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app.socks5queue.connect_to_hosts(self.session.connection.name,
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sid,
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self.on_connect,
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self._on_connect_error,
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fingerprint=fingerprint,
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receiving=False)
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raise nbxmpp.NodeProcessed
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self.__state_changed(State.TRANSFERING)
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raise nbxmpp.NodeProcessed
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def __on_session_terminate(self, stanza, content, error, action):
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log.info("__on_session_terminate")
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def __on_session_info(self, stanza, content, error, action):
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pass
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def __on_transport_accept(self, stanza, content, error, action):
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log.info("__on_transport_accept")
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def __on_transport_replace(self, stanza, content, error, action):
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log.info("__on_transport_replace")
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def __on_transport_reject(self, stanza, content, error, action):
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log.info("__on_transport_reject")
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def __on_transport_info(self, stanza, content, error, action):
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log.info("__on_transport_info")
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cand_error = content.getTag('transport').getTag('candidate-error')
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cand_used = content.getTag('transport').getTag('candidate-used')
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if (cand_error or cand_used) and \
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self.state >= State.CAND_SENT_AND_RECEIVED:
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raise nbxmpp.NodeProcessed
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if cand_error:
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if not app.socks5queue.listener.connections:
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app.socks5queue.listener.disconnect()
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self.nominated_cand['peer-cand'] = False
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if self.state == State.CAND_SENT:
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if not self.nominated_cand['our-cand'] and \
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not self.nominated_cand['peer-cand']:
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if not self.weinitiate:
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return
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self.__state_changed(State.TRANSPORT_REPLACE)
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else:
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response = stanza.buildReply('result')
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response.delChild(response.getQuery())
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self.session.connection.connection.send(response)
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self.__state_changed(State.TRANSFERING)
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raise nbxmpp.NodeProcessed
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else:
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args = {'candError' : True}
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self.__state_changed(State.CAND_RECEIVED, args)
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return
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if cand_used:
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streamhost_cid = cand_used.getAttr('cid')
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streamhost_used = None
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for cand in self.transport.candidates:
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if cand['candidate_id'] == streamhost_cid:
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streamhost_used = cand
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break
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if streamhost_used is None or streamhost_used['type'] == 'proxy':
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if app.socks5queue.listener and \
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not app.socks5queue.listener.connections:
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app.socks5queue.listener.disconnect()
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if content.getTag('transport').getTag('activated'):
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self.state = State.TRANSFERING
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app.socks5queue.send_file(self.file_props,
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self.session.connection.name, 'client')
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return
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args = {'content': content,
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'sendCand': False}
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if self.state == State.CAND_SENT:
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self.__state_changed(State.CAND_SENT_AND_RECEIVED, args)
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self.__state_changed(State.TRANSFERING)
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raise nbxmpp.NodeProcessed
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else:
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self.__state_changed(State.CAND_RECEIVED, args)
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def __on_iq_result(self, stanza, content, error, action):
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log.info("__on_iq_result")
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if self.state == State.NOT_STARTED:
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self.__state_changed(State.INITIALIZED)
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elif self.state == State.CAND_SENT_AND_RECEIVED:
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if not self.nominated_cand['our-cand'] and \
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not self.nominated_cand['peer-cand']:
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if not self.weinitiate:
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return
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self.__state_changed(State.TRANSPORT_REPLACE)
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return
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# initiate transfer
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self.__state_changed(State.TRANSFERING)
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def __transport_setup(self, stanza=None, content=None, error=None,
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action=None):
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# Sets up a few transport specific things for the file transfer
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if self.transport.type_ == TransportType.IBB:
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# No action required, just set the state to transfering
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self.state = State.TRANSFERING
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else:
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self._listen_host()
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def on_connect(self, streamhost):
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"""
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send candidate-used stanza
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"""
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log.info('send_candidate_used')
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if streamhost is None:
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return
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args = {'streamhost' : streamhost,
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'sendCand' : True}
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self.nominated_cand['our-cand'] = streamhost
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self.__send_candidate(args)
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def _on_connect_error(self, sid):
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log.info('connect error, sid=%s', sid)
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args = {'candError' : True,
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'sendCand' : True}
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self.__send_candidate(args)
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def __send_candidate(self, args):
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if self.state == State.CAND_RECEIVED:
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self.__state_changed(State.CAND_SENT_AND_RECEIVED, args)
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else:
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self.__state_changed(State.CAND_SENT, args)
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def _store_socks5_sid(self, sid, hash_id):
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# callback from socsk5queue.start_listener
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self.file_props.hash_ = hash_id
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def _listen_host(self):
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receiver = self.file_props.receiver
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sender = self.file_props.sender
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sha_str = helpers.get_auth_sha(self.file_props.sid, sender,
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receiver)
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self.file_props.sha_str = sha_str
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port = app.config.get('file_transfers_port')
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fingerprint = None
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if self.use_security:
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fingerprint = 'server'
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listener = app.socks5queue.start_listener(port, sha_str,
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self._store_socks5_sid,
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self.file_props,
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fingerprint=fingerprint,
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typ='sender' if self.weinitiate else 'receiver')
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if not listener:
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# send error message, notify the user
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return
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def is_our_candidate_used(self):
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'''
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If this method returns true then the candidate we nominated will be
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used, if false, the candidate nominated by peer will be used
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'''
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if not self.nominated_cand['peer-cand']:
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return True
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if not self.nominated_cand['our-cand']:
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return False
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peer_pr = int(self.nominated_cand['peer-cand']['priority'])
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our_pr = int(self.nominated_cand['our-cand']['priority'])
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if peer_pr != our_pr:
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return our_pr > peer_pr
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return self.weinitiate
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def start_ibb_transfer(self):
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if self.file_props.type_ == 's':
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self.__state_changed(State.TRANSFERING)
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def get_content(desc):
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return JingleFileTransfer
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contents[nbxmpp.NS_JINGLE_FILE_TRANSFER_5] = get_content
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