1152 lines
51 KiB
Python
1152 lines
51 KiB
Python
# MIT License
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#
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# Copyright (c) 2016-2022 Mark Qvist / unsigned.io
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from RNS.Cryptography import X25519PrivateKey, X25519PublicKey, Ed25519PrivateKey, Ed25519PublicKey
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from RNS.Cryptography import Fernet
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from RNS.Channel import Channel, LinkChannelOutlet
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from time import sleep
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from .vendor import umsgpack as umsgpack
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import threading
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import inspect
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import math
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import time
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import RNS
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class LinkCallbacks:
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def __init__(self):
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self.link_established = None
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self.link_closed = None
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self.packet = None
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self.resource = None
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self.resource_started = None
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self.resource_concluded = None
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self.remote_identified = None
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class Link:
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"""
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This class is used to establish and manage links to other peers. When a
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link instance is created, Reticulum will attempt to establish verified
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and encrypted connectivity with the specified destination.
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:param destination: A :ref:`RNS.Destination<api-destination>` instance which to establish a link to.
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:param established_callback: An optional function or method with the signature *callback(link)* to be called when the link has been established.
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:param closed_callback: An optional function or method with the signature *callback(link)* to be called when the link is closed.
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"""
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CURVE = RNS.Identity.CURVE
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"""
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The curve used for Elliptic Curve DH key exchanges
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"""
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ECPUBSIZE = 32+32
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KEYSIZE = 32
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MDU = math.floor((RNS.Reticulum.MTU-RNS.Reticulum.IFAC_MIN_SIZE-RNS.Reticulum.HEADER_MINSIZE-RNS.Identity.FERNET_OVERHEAD)/RNS.Identity.AES128_BLOCKSIZE)*RNS.Identity.AES128_BLOCKSIZE - 1
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ESTABLISHMENT_TIMEOUT_PER_HOP = RNS.Reticulum.DEFAULT_PER_HOP_TIMEOUT
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"""
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Timeout for link establishment in seconds per hop to destination.
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"""
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TRAFFIC_TIMEOUT_FACTOR = 6
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KEEPALIVE_TIMEOUT_FACTOR = 4
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"""
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RTT timeout factor used in link timeout calculation.
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"""
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STALE_GRACE = 2
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"""
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Grace period in seconds used in link timeout calculation.
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"""
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KEEPALIVE = 360
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"""
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Interval for sending keep-alive packets on established links in seconds.
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"""
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STALE_TIME = 2*KEEPALIVE
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"""
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If no traffic or keep-alive packets are received within this period, the
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link will be marked as stale, and a final keep-alive packet will be sent.
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If after this no traffic or keep-alive packets are received within ``RTT`` *
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``KEEPALIVE_TIMEOUT_FACTOR`` + ``STALE_GRACE``, the link is considered timed out,
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and will be torn down.
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"""
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PENDING = 0x00
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HANDSHAKE = 0x01
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ACTIVE = 0x02
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STALE = 0x03
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CLOSED = 0x04
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TIMEOUT = 0x01
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INITIATOR_CLOSED = 0x02
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DESTINATION_CLOSED = 0x03
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ACCEPT_NONE = 0x00
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ACCEPT_APP = 0x01
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ACCEPT_ALL = 0x02
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resource_strategies = [ACCEPT_NONE, ACCEPT_APP, ACCEPT_ALL]
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@staticmethod
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def validate_request(owner, data, packet):
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if len(data) == (Link.ECPUBSIZE):
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try:
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link = Link(owner = owner, peer_pub_bytes=data[:Link.ECPUBSIZE//2], peer_sig_pub_bytes=data[Link.ECPUBSIZE//2:Link.ECPUBSIZE])
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link.set_link_id(packet)
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link.destination = packet.destination
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link.establishment_timeout = Link.ESTABLISHMENT_TIMEOUT_PER_HOP * max(1, packet.hops)
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link.establishment_cost += len(packet.raw)
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RNS.log("Validating link request "+RNS.prettyhexrep(link.link_id), RNS.LOG_VERBOSE)
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link.handshake()
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link.attached_interface = packet.receiving_interface
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link.prove()
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link.request_time = time.time()
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RNS.Transport.register_link(link)
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link.last_inbound = time.time()
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link.start_watchdog()
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RNS.log("Incoming link request "+str(link)+" accepted", RNS.LOG_VERBOSE)
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return link
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except Exception as e:
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RNS.log("Validating link request failed", RNS.LOG_VERBOSE)
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RNS.log("exc: "+str(e))
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return None
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else:
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RNS.log("Invalid link request payload size, dropping request", RNS.LOG_VERBOSE)
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return None
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def __init__(self, destination=None, established_callback = None, closed_callback = None, owner=None, peer_pub_bytes = None, peer_sig_pub_bytes = None):
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if destination != None and destination.type != RNS.Destination.SINGLE:
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raise TypeError("Links can only be established to the \"single\" destination type")
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self.rtt = None
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self.establishment_cost = 0
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self.callbacks = LinkCallbacks()
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self.resource_strategy = Link.ACCEPT_NONE
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self.outgoing_resources = []
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self.incoming_resources = []
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self.pending_requests = []
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self.last_inbound = 0
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self.last_outbound = 0
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self.tx = 0
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self.rx = 0
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self.txbytes = 0
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self.rxbytes = 0
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self.traffic_timeout_factor = Link.TRAFFIC_TIMEOUT_FACTOR
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self.keepalive_timeout_factor = Link.KEEPALIVE_TIMEOUT_FACTOR
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self.keepalive = Link.KEEPALIVE
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self.stale_time = Link.STALE_TIME
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self.watchdog_lock = False
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self.status = Link.PENDING
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self.activated_at = None
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self.type = RNS.Destination.LINK
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self.owner = owner
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self.destination = destination
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self.attached_interface = None
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self.__remote_identity = None
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self._channel = None
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if self.destination == None:
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self.initiator = False
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self.prv = X25519PrivateKey.generate()
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self.sig_prv = self.owner.identity.sig_prv
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else:
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self.initiator = True
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self.establishment_timeout = Link.ESTABLISHMENT_TIMEOUT_PER_HOP * max(1, RNS.Transport.hops_to(destination.hash))
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self.prv = X25519PrivateKey.generate()
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self.sig_prv = Ed25519PrivateKey.generate()
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self.fernet = None
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self.pub = self.prv.public_key()
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self.pub_bytes = self.pub.public_bytes()
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self.sig_pub = self.sig_prv.public_key()
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self.sig_pub_bytes = self.sig_pub.public_bytes()
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if peer_pub_bytes == None:
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self.peer_pub = None
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self.peer_pub_bytes = None
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else:
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self.load_peer(peer_pub_bytes, peer_sig_pub_bytes)
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if established_callback != None:
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self.set_link_established_callback(established_callback)
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if closed_callback != None:
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self.set_link_closed_callback(closed_callback)
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if (self.initiator):
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self.request_data = self.pub_bytes+self.sig_pub_bytes
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self.packet = RNS.Packet(destination, self.request_data, packet_type=RNS.Packet.LINKREQUEST)
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self.packet.pack()
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self.establishment_cost += len(self.packet.raw)
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self.set_link_id(self.packet)
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RNS.Transport.register_link(self)
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self.request_time = time.time()
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self.start_watchdog()
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self.packet.send()
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self.had_outbound()
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RNS.log("Link request "+RNS.prettyhexrep(self.link_id)+" sent to "+str(self.destination), RNS.LOG_DEBUG)
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def load_peer(self, peer_pub_bytes, peer_sig_pub_bytes):
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self.peer_pub_bytes = peer_pub_bytes
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self.peer_pub = X25519PublicKey.from_public_bytes(self.peer_pub_bytes)
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self.peer_sig_pub_bytes = peer_sig_pub_bytes
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self.peer_sig_pub = Ed25519PublicKey.from_public_bytes(self.peer_sig_pub_bytes)
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if not hasattr(self.peer_pub, "curve"):
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self.peer_pub.curve = Link.CURVE
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def set_link_id(self, packet):
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self.link_id = packet.getTruncatedHash()
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self.hash = self.link_id
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def handshake(self):
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self.status = Link.HANDSHAKE
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self.shared_key = self.prv.exchange(self.peer_pub)
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self.derived_key = RNS.Cryptography.hkdf(
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length=32,
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derive_from=self.shared_key,
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salt=self.get_salt(),
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context=self.get_context(),
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)
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def prove(self):
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signed_data = self.link_id+self.pub_bytes+self.sig_pub_bytes
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signature = self.owner.identity.sign(signed_data)
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proof_data = signature+self.pub_bytes
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proof = RNS.Packet(self, proof_data, packet_type=RNS.Packet.PROOF, context=RNS.Packet.LRPROOF)
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proof.send()
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self.establishment_cost += len(proof.raw)
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self.had_outbound()
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def prove_packet(self, packet):
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signature = self.sign(packet.packet_hash)
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# TODO: Hardcoded as explicit proof for now
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# if RNS.Reticulum.should_use_implicit_proof():
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# proof_data = signature
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# else:
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# proof_data = packet.packet_hash + signature
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proof_data = packet.packet_hash + signature
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proof = RNS.Packet(self, proof_data, RNS.Packet.PROOF)
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proof.send()
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self.had_outbound()
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def validate_proof(self, packet):
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if self.status == Link.PENDING:
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if self.initiator and len(packet.data) == RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2:
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peer_pub_bytes = packet.data[RNS.Identity.SIGLENGTH//8:RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2]
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peer_sig_pub_bytes = self.destination.identity.get_public_key()[Link.ECPUBSIZE//2:Link.ECPUBSIZE]
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self.load_peer(peer_pub_bytes, peer_sig_pub_bytes)
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self.handshake()
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self.establishment_cost += len(packet.raw)
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signed_data = self.link_id+self.peer_pub_bytes+self.peer_sig_pub_bytes
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signature = packet.data[:RNS.Identity.SIGLENGTH//8]
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if self.destination.identity.validate(signature, signed_data):
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self.rtt = time.time() - self.request_time
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self.attached_interface = packet.receiving_interface
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self.__remote_identity = self.destination.identity
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self.status = Link.ACTIVE
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self.activated_at = time.time()
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RNS.Transport.activate_link(self)
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RNS.log("Link "+str(self)+" established with "+str(self.destination)+", RTT is "+str(round(self.rtt, 3))+"s", RNS.LOG_VERBOSE)
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if self.rtt != None and self.establishment_cost != None and self.rtt > 0 and self.establishment_cost > 0:
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self.establishment_rate = self.establishment_cost/self.rtt
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rtt_data = umsgpack.packb(self.rtt)
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rtt_packet = RNS.Packet(self, rtt_data, context=RNS.Packet.LRRTT)
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rtt_packet.send()
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self.had_outbound()
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if self.callbacks.link_established != None:
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thread = threading.Thread(target=self.callbacks.link_established, args=(self,))
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thread.daemon = True
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thread.start()
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else:
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RNS.log("Invalid link proof signature received by "+str(self)+". Ignoring.", RNS.LOG_DEBUG)
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def identify(self, identity):
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"""
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Identifies the initiator of the link to the remote peer. This can only happen
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once the link has been established, and is carried out over the encrypted link.
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The identity is only revealed to the remote peer, and initiator anonymity is
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thus preserved. This method can be used for authentication.
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:param identity: An RNS.Identity instance to identify as.
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"""
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if self.initiator:
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signed_data = self.link_id + identity.get_public_key()
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signature = identity.sign(signed_data)
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proof_data = identity.get_public_key() + signature
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proof = RNS.Packet(self, proof_data, RNS.Packet.DATA, context = RNS.Packet.LINKIDENTIFY)
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proof.send()
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self.had_outbound()
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def request(self, path, data = None, response_callback = None, failed_callback = None, progress_callback = None, timeout = None):
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"""
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Sends a request to the remote peer.
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:param path: The request path.
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:param response_callback: An optional function or method with the signature *response_callback(request_receipt)* to be called when a response is received. See the :ref:`Request Example<example-request>` for more info.
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:param failed_callback: An optional function or method with the signature *failed_callback(request_receipt)* to be called when a request fails. See the :ref:`Request Example<example-request>` for more info.
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:param progress_callback: An optional function or method with the signature *progress_callback(request_receipt)* to be called when progress is made receiving the response. Progress can be accessed as a float between 0.0 and 1.0 by the *request_receipt.progress* property.
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:param timeout: An optional timeout in seconds for the request. If *None* is supplied it will be calculated based on link RTT.
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:returns: A :ref:`RNS.RequestReceipt<api-requestreceipt>` instance if the request was sent, or *False* if it was not.
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"""
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request_path_hash = RNS.Identity.truncated_hash(path.encode("utf-8"))
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unpacked_request = [time.time(), request_path_hash, data]
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packed_request = umsgpack.packb(unpacked_request)
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if timeout == None:
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timeout = self.rtt * self.traffic_timeout_factor + RNS.Resource.RESPONSE_MAX_GRACE_TIME/4.0
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if len(packed_request) <= Link.MDU:
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request_packet = RNS.Packet(self, packed_request, RNS.Packet.DATA, context = RNS.Packet.REQUEST)
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packet_receipt = request_packet.send()
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if packet_receipt == False:
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return False
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else:
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packet_receipt.set_timeout(timeout)
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return RequestReceipt(
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self,
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packet_receipt = packet_receipt,
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response_callback = response_callback,
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failed_callback = failed_callback,
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progress_callback = progress_callback,
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timeout = timeout,
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request_size = len(packed_request),
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)
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else:
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request_id = RNS.Identity.truncated_hash(packed_request)
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RNS.log("Sending request "+RNS.prettyhexrep(request_id)+" as resource.", RNS.LOG_DEBUG)
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request_resource = RNS.Resource(packed_request, self, request_id = request_id, is_response = False, timeout = timeout)
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return RequestReceipt(
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self,
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resource = request_resource,
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response_callback = response_callback,
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failed_callback = failed_callback,
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progress_callback = progress_callback,
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timeout = timeout,
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request_size = len(packed_request),
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)
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def rtt_packet(self, packet):
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try:
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measured_rtt = time.time() - self.request_time
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plaintext = self.decrypt(packet.data)
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rtt = umsgpack.unpackb(plaintext)
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self.rtt = max(measured_rtt, rtt)
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self.status = Link.ACTIVE
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self.activated_at = time.time()
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if self.rtt != None and self.establishment_cost != None and self.rtt > 0 and self.establishment_cost > 0:
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self.establishment_rate = self.establishment_cost/self.rtt
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if self.owner.callbacks.link_established != None:
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self.owner.callbacks.link_established(self)
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except Exception as e:
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RNS.log("Error occurred while processing RTT packet, tearing down link. The contained exception was: "+str(e), RNS.LOG_ERROR)
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self.teardown()
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def get_establishment_rate(self):
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"""
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:returns: The data transfer rate at which the link establishment procedure ocurred, in bits per second.
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"""
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if self.establishment_rate != None:
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return self.establishment_rate*8
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else:
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return None
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def get_salt(self):
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return self.link_id
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def get_context(self):
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return None
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def no_inbound_for(self):
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"""
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:returns: The time in seconds since last inbound packet on the link.
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"""
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activated_at = self.activated_at if self.activated_at != None else 0
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last_inbound = max(self.last_inbound, activated_at)
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return time.time() - last_inbound
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def no_outbound_for(self):
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"""
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:returns: The time in seconds since last outbound packet on the link.
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"""
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return time.time() - self.last_outbound
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def inactive_for(self):
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"""
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:returns: The time in seconds since activity on the link.
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"""
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return min(self.no_inbound_for(), self.no_outbound_for())
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|
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def get_remote_identity(self):
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"""
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:returns: The identity of the remote peer, if it is known. Calling this method will not query the remote initiator to reveal its identity. Returns ``None`` if the link initiator has not already independently called the ``identify(identity)`` method.
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"""
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return self.__remote_identity
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def had_outbound(self):
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self.last_outbound = time.time()
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def teardown(self):
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"""
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Closes the link and purges encryption keys. New keys will
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be used if a new link to the same destination is established.
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"""
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if self.status != Link.PENDING and self.status != Link.CLOSED:
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teardown_packet = RNS.Packet(self, self.link_id, context=RNS.Packet.LINKCLOSE)
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teardown_packet.send()
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self.had_outbound()
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self.status = Link.CLOSED
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if self.initiator:
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self.teardown_reason = Link.INITIATOR_CLOSED
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else:
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self.teardown_reason = Link.DESTINATION_CLOSED
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self.link_closed()
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def teardown_packet(self, packet):
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try:
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plaintext = self.decrypt(packet.data)
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if plaintext == self.link_id:
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self.status = Link.CLOSED
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if self.initiator:
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self.teardown_reason = Link.DESTINATION_CLOSED
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else:
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self.teardown_reason = Link.INITIATOR_CLOSED
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self.link_closed()
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except Exception as e:
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pass
|
|
|
|
def link_closed(self):
|
|
for resource in self.incoming_resources:
|
|
resource.cancel()
|
|
for resource in self.outgoing_resources:
|
|
resource.cancel()
|
|
if self._channel:
|
|
self._channel._shutdown()
|
|
|
|
self.prv = None
|
|
self.pub = None
|
|
self.pub_bytes = None
|
|
self.shared_key = None
|
|
self.derived_key = None
|
|
|
|
if self.destination != None:
|
|
if self.destination.direction == RNS.Destination.IN:
|
|
if self in self.destination.links:
|
|
self.destination.links.remove(self)
|
|
|
|
if self.callbacks.link_closed != None:
|
|
try:
|
|
self.callbacks.link_closed(self)
|
|
except Exception as e:
|
|
RNS.log("Error while executing link closed callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
|
|
def start_watchdog(self):
|
|
thread = threading.Thread(target=self.__watchdog_job)
|
|
thread.daemon = True
|
|
thread.start()
|
|
|
|
def __watchdog_job(self):
|
|
while not self.status == Link.CLOSED:
|
|
while (self.watchdog_lock):
|
|
sleep(max(self.rtt, 0.025))
|
|
|
|
if not self.status == Link.CLOSED:
|
|
# Link was initiated, but no response
|
|
# from destination yet
|
|
if self.status == Link.PENDING:
|
|
next_check = self.request_time + self.establishment_timeout
|
|
sleep_time = next_check - time.time()
|
|
if time.time() >= self.request_time + self.establishment_timeout:
|
|
RNS.log("Link establishment timed out", RNS.LOG_VERBOSE)
|
|
self.status = Link.CLOSED
|
|
self.teardown_reason = Link.TIMEOUT
|
|
self.link_closed()
|
|
sleep_time = 0.001
|
|
|
|
elif self.status == Link.HANDSHAKE:
|
|
next_check = self.request_time + self.establishment_timeout
|
|
sleep_time = next_check - time.time()
|
|
if time.time() >= self.request_time + self.establishment_timeout:
|
|
if self.initiator:
|
|
RNS.log("Timeout waiting for link request proof", RNS.LOG_DEBUG)
|
|
else:
|
|
RNS.log("Timeout waiting for RTT packet from link initiator", RNS.LOG_DEBUG)
|
|
|
|
self.status = Link.CLOSED
|
|
self.teardown_reason = Link.TIMEOUT
|
|
self.link_closed()
|
|
sleep_time = 0.001
|
|
|
|
elif self.status == Link.ACTIVE:
|
|
activated_at = self.activated_at if self.activated_at != None else 0
|
|
last_inbound = max(self.last_inbound, activated_at)
|
|
|
|
if time.time() >= last_inbound + self.keepalive:
|
|
if self.initiator:
|
|
self.send_keepalive()
|
|
|
|
if time.time() >= last_inbound + self.stale_time:
|
|
sleep_time = self.rtt * self.keepalive_timeout_factor + Link.STALE_GRACE
|
|
self.status = Link.STALE
|
|
else:
|
|
sleep_time = self.keepalive
|
|
|
|
else:
|
|
sleep_time = (last_inbound + self.keepalive) - time.time()
|
|
|
|
elif self.status == Link.STALE:
|
|
sleep_time = 0.001
|
|
self.status = Link.CLOSED
|
|
self.teardown_reason = Link.TIMEOUT
|
|
self.link_closed()
|
|
|
|
|
|
if sleep_time == 0:
|
|
RNS.log("Warning! Link watchdog sleep time of 0!", RNS.LOG_ERROR)
|
|
if sleep_time == None or sleep_time < 0:
|
|
RNS.log("Timing error! Tearing down link "+str(self)+" now.", RNS.LOG_ERROR)
|
|
self.teardown()
|
|
sleep_time = 0.1
|
|
|
|
sleep(sleep_time)
|
|
|
|
|
|
def send_keepalive(self):
|
|
keepalive_packet = RNS.Packet(self, bytes([0xFF]), context=RNS.Packet.KEEPALIVE)
|
|
keepalive_packet.send()
|
|
self.had_outbound()
|
|
|
|
def handle_request(self, request_id, unpacked_request):
|
|
if self.status == Link.ACTIVE:
|
|
requested_at = unpacked_request[0]
|
|
path_hash = unpacked_request[1]
|
|
request_data = unpacked_request[2]
|
|
|
|
if path_hash in self.destination.request_handlers:
|
|
request_handler = self.destination.request_handlers[path_hash]
|
|
path = request_handler[0]
|
|
response_generator = request_handler[1]
|
|
allow = request_handler[2]
|
|
allowed_list = request_handler[3]
|
|
|
|
allowed = False
|
|
if not allow == RNS.Destination.ALLOW_NONE:
|
|
if allow == RNS.Destination.ALLOW_LIST:
|
|
if self.__remote_identity != None and self.__remote_identity.hash in allowed_list:
|
|
allowed = True
|
|
elif allow == RNS.Destination.ALLOW_ALL:
|
|
allowed = True
|
|
|
|
if allowed:
|
|
RNS.log("Handling request "+RNS.prettyhexrep(request_id)+" for: "+str(path), RNS.LOG_DEBUG)
|
|
if len(inspect.signature(response_generator).parameters) == 5:
|
|
response = response_generator(path, request_data, request_id, self.__remote_identity, requested_at)
|
|
elif len(inspect.signature(response_generator).parameters) == 6:
|
|
response = response_generator(path, request_data, request_id, self.link_id, self.__remote_identity, requested_at)
|
|
else:
|
|
raise TypeError("Invalid signature for response generator callback")
|
|
|
|
if response != None:
|
|
packed_response = umsgpack.packb([request_id, response])
|
|
|
|
if len(packed_response) <= Link.MDU:
|
|
RNS.Packet(self, packed_response, RNS.Packet.DATA, context = RNS.Packet.RESPONSE).send()
|
|
else:
|
|
response_resource = RNS.Resource(packed_response, self, request_id = request_id, is_response = True)
|
|
else:
|
|
identity_string = str(self.get_remote_identity()) if self.get_remote_identity() != None else "<Unknown>"
|
|
RNS.log("Request "+RNS.prettyhexrep(request_id)+" from "+identity_string+" not allowed for: "+str(path), RNS.LOG_DEBUG)
|
|
|
|
def handle_response(self, request_id, response_data, response_size, response_transfer_size):
|
|
if self.status == Link.ACTIVE:
|
|
remove = None
|
|
for pending_request in self.pending_requests:
|
|
if pending_request.request_id == request_id:
|
|
remove = pending_request
|
|
try:
|
|
pending_request.response_size = response_size
|
|
pending_request.response_transfer_size = response_transfer_size
|
|
pending_request.response_received(response_data)
|
|
except Exception as e:
|
|
RNS.log("Error occurred while handling response. The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
break
|
|
|
|
if remove != None:
|
|
if remove in self.pending_requests:
|
|
self.pending_requests.remove(remove)
|
|
|
|
def request_resource_concluded(self, resource):
|
|
if resource.status == RNS.Resource.COMPLETE:
|
|
packed_request = resource.data.read()
|
|
unpacked_request = umsgpack.unpackb(packed_request)
|
|
request_id = RNS.Identity.truncated_hash(packed_request)
|
|
request_data = unpacked_request
|
|
|
|
self.handle_request(request_id, request_data)
|
|
else:
|
|
RNS.log("Incoming request resource failed with status: "+RNS.hexrep([resource.status]), RNS.LOG_DEBUG)
|
|
|
|
def response_resource_concluded(self, resource):
|
|
if resource.status == RNS.Resource.COMPLETE:
|
|
packed_response = resource.data.read()
|
|
unpacked_response = umsgpack.unpackb(packed_response)
|
|
request_id = unpacked_response[0]
|
|
response_data = unpacked_response[1]
|
|
|
|
self.handle_response(request_id, response_data, resource.total_size, resource.size)
|
|
else:
|
|
RNS.log("Incoming response resource failed with status: "+RNS.hexrep([resource.status]), RNS.LOG_DEBUG)
|
|
for pending_request in self.pending_requests:
|
|
if pending_request.request_id == resource.request_id:
|
|
pending_request.request_timed_out(None)
|
|
|
|
def get_channel(self):
|
|
if self._channel is None:
|
|
self._channel = Channel(LinkChannelOutlet(self))
|
|
return self._channel
|
|
|
|
def receive(self, packet):
|
|
self.watchdog_lock = True
|
|
if not self.status == Link.CLOSED and not (self.initiator and packet.context == RNS.Packet.KEEPALIVE and packet.data == bytes([0xFF])):
|
|
if packet.receiving_interface != self.attached_interface:
|
|
RNS.log("Link-associated packet received on unexpected interface! Someone might be trying to manipulate your communication!", RNS.LOG_ERROR)
|
|
else:
|
|
self.last_inbound = time.time()
|
|
self.rx += 1
|
|
self.rxbytes += len(packet.data)
|
|
if self.status == Link.STALE:
|
|
self.status = Link.ACTIVE
|
|
|
|
if packet.packet_type == RNS.Packet.DATA:
|
|
if packet.context == RNS.Packet.NONE:
|
|
plaintext = self.decrypt(packet.data)
|
|
if self.callbacks.packet != None:
|
|
thread = threading.Thread(target=self.callbacks.packet, args=(plaintext, packet))
|
|
thread.daemon = True
|
|
thread.start()
|
|
|
|
if self.destination.proof_strategy == RNS.Destination.PROVE_ALL:
|
|
packet.prove()
|
|
|
|
elif self.destination.proof_strategy == RNS.Destination.PROVE_APP:
|
|
if self.destination.callbacks.proof_requested:
|
|
try:
|
|
self.destination.callbacks.proof_requested(packet)
|
|
except Exception as e:
|
|
RNS.log("Error while executing proof request callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
elif packet.context == RNS.Packet.LINKIDENTIFY:
|
|
plaintext = self.decrypt(packet.data)
|
|
|
|
if not self.initiator and len(plaintext) == RNS.Identity.KEYSIZE//8 + RNS.Identity.SIGLENGTH//8:
|
|
public_key = plaintext[:RNS.Identity.KEYSIZE//8]
|
|
signed_data = self.link_id+public_key
|
|
signature = plaintext[RNS.Identity.KEYSIZE//8:RNS.Identity.KEYSIZE//8+RNS.Identity.SIGLENGTH//8]
|
|
identity = RNS.Identity(create_keys=False)
|
|
identity.load_public_key(public_key)
|
|
|
|
if identity.validate(signature, signed_data):
|
|
self.__remote_identity = identity
|
|
if self.callbacks.remote_identified != None:
|
|
try:
|
|
self.callbacks.remote_identified(self, self.__remote_identity)
|
|
except Exception as e:
|
|
RNS.log("Error while executing remote identified callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
elif packet.context == RNS.Packet.REQUEST:
|
|
try:
|
|
request_id = packet.getTruncatedHash()
|
|
packed_request = self.decrypt(packet.data)
|
|
unpacked_request = umsgpack.unpackb(packed_request)
|
|
self.handle_request(request_id, unpacked_request)
|
|
except Exception as e:
|
|
RNS.log("Error occurred while handling request. The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
elif packet.context == RNS.Packet.RESPONSE:
|
|
try:
|
|
packed_response = self.decrypt(packet.data)
|
|
unpacked_response = umsgpack.unpackb(packed_response)
|
|
request_id = unpacked_response[0]
|
|
response_data = unpacked_response[1]
|
|
transfer_size = len(umsgpack.packb(response_data))-2
|
|
self.handle_response(request_id, response_data, transfer_size, transfer_size)
|
|
except Exception as e:
|
|
RNS.log("Error occurred while handling response. The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
elif packet.context == RNS.Packet.LRRTT:
|
|
if not self.initiator:
|
|
self.rtt_packet(packet)
|
|
|
|
elif packet.context == RNS.Packet.LINKCLOSE:
|
|
self.teardown_packet(packet)
|
|
|
|
elif packet.context == RNS.Packet.RESOURCE_ADV:
|
|
packet.plaintext = self.decrypt(packet.data)
|
|
|
|
if RNS.ResourceAdvertisement.is_request(packet):
|
|
RNS.Resource.accept(packet, callback=self.request_resource_concluded)
|
|
elif RNS.ResourceAdvertisement.is_response(packet):
|
|
request_id = RNS.ResourceAdvertisement.read_request_id(packet)
|
|
for pending_request in self.pending_requests:
|
|
if pending_request.request_id == request_id:
|
|
RNS.Resource.accept(packet, callback=self.response_resource_concluded, progress_callback=pending_request.response_resource_progress, request_id = request_id)
|
|
pending_request.response_size = RNS.ResourceAdvertisement.read_size(packet)
|
|
pending_request.response_transfer_size = RNS.ResourceAdvertisement.read_transfer_size(packet)
|
|
pending_request.started_at = time.time()
|
|
elif self.resource_strategy == Link.ACCEPT_NONE:
|
|
pass
|
|
elif self.resource_strategy == Link.ACCEPT_APP:
|
|
if self.callbacks.resource != None:
|
|
try:
|
|
resource_advertisement = RNS.ResourceAdvertisement.unpack(packet.plaintext)
|
|
resource_advertisement.link = self
|
|
if self.callbacks.resource(resource_advertisement):
|
|
RNS.Resource.accept(packet, self.callbacks.resource_concluded)
|
|
except Exception as e:
|
|
RNS.log("Error while executing resource accept callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
elif self.resource_strategy == Link.ACCEPT_ALL:
|
|
RNS.Resource.accept(packet, self.callbacks.resource_concluded)
|
|
|
|
elif packet.context == RNS.Packet.RESOURCE_REQ:
|
|
plaintext = self.decrypt(packet.data)
|
|
if ord(plaintext[:1]) == RNS.Resource.HASHMAP_IS_EXHAUSTED:
|
|
resource_hash = plaintext[1+RNS.Resource.MAPHASH_LEN:RNS.Identity.HASHLENGTH//8+1+RNS.Resource.MAPHASH_LEN]
|
|
else:
|
|
resource_hash = plaintext[1:RNS.Identity.HASHLENGTH//8+1]
|
|
|
|
for resource in self.outgoing_resources:
|
|
if resource.hash == resource_hash:
|
|
# We need to check that this request has not been
|
|
# received before in order to avoid sequencing errors.
|
|
if not packet.packet_hash in resource.req_hashlist:
|
|
resource.req_hashlist.append(packet.packet_hash)
|
|
resource.request(plaintext)
|
|
|
|
elif packet.context == RNS.Packet.RESOURCE_HMU:
|
|
plaintext = self.decrypt(packet.data)
|
|
resource_hash = plaintext[:RNS.Identity.HASHLENGTH//8]
|
|
for resource in self.incoming_resources:
|
|
if resource_hash == resource.hash:
|
|
resource.hashmap_update_packet(plaintext)
|
|
|
|
elif packet.context == RNS.Packet.RESOURCE_ICL:
|
|
plaintext = self.decrypt(packet.data)
|
|
resource_hash = plaintext[:RNS.Identity.HASHLENGTH//8]
|
|
for resource in self.incoming_resources:
|
|
if resource_hash == resource.hash:
|
|
resource.cancel()
|
|
|
|
elif packet.context == RNS.Packet.KEEPALIVE:
|
|
if not self.initiator and packet.data == bytes([0xFF]):
|
|
keepalive_packet = RNS.Packet(self, bytes([0xFE]), context=RNS.Packet.KEEPALIVE)
|
|
keepalive_packet.send()
|
|
self.had_outbound()
|
|
|
|
|
|
# TODO: find the most efficient way to allow multiple
|
|
# transfers at the same time, sending resource hash on
|
|
# each packet is a huge overhead. Probably some kind
|
|
# of hash -> sequence map
|
|
elif packet.context == RNS.Packet.RESOURCE:
|
|
for resource in self.incoming_resources:
|
|
resource.receive_part(packet)
|
|
|
|
elif packet.context == RNS.Packet.CHANNEL:
|
|
if not self._channel:
|
|
RNS.log(f"Channel data received without open channel", RNS.LOG_DEBUG)
|
|
else:
|
|
plaintext = self.decrypt(packet.data)
|
|
self._channel._receive(plaintext)
|
|
packet.prove()
|
|
|
|
elif packet.packet_type == RNS.Packet.PROOF:
|
|
if packet.context == RNS.Packet.RESOURCE_PRF:
|
|
resource_hash = packet.data[0:RNS.Identity.HASHLENGTH//8]
|
|
for resource in self.outgoing_resources:
|
|
if resource_hash == resource.hash:
|
|
resource.validate_proof(packet.data)
|
|
|
|
self.watchdog_lock = False
|
|
|
|
|
|
def encrypt(self, plaintext):
|
|
try:
|
|
if not self.fernet:
|
|
try:
|
|
self.fernet = Fernet(self.derived_key)
|
|
except Exception as e:
|
|
RNS.log("Could not "+str(self)+" instantiate Fernet while performin encryption on link. The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
raise e
|
|
|
|
return self.fernet.encrypt(plaintext)
|
|
|
|
except Exception as e:
|
|
RNS.log("Encryption on link "+str(self)+" failed. The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
raise e
|
|
|
|
|
|
def decrypt(self, ciphertext):
|
|
try:
|
|
if not self.fernet:
|
|
self.fernet = Fernet(self.derived_key)
|
|
|
|
return self.fernet.decrypt(ciphertext)
|
|
|
|
except Exception as e:
|
|
RNS.log("Decryption failed on link "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
|
|
def sign(self, message):
|
|
return self.sig_prv.sign(message)
|
|
|
|
def validate(self, signature, message):
|
|
try:
|
|
self.peer_sig_pub.verify(signature, message)
|
|
return True
|
|
except Exception as e:
|
|
return False
|
|
|
|
def set_link_established_callback(self, callback):
|
|
self.callbacks.link_established = callback
|
|
|
|
def set_link_closed_callback(self, callback):
|
|
"""
|
|
Registers a function to be called when a link has been
|
|
torn down.
|
|
|
|
:param callback: A function or method with the signature *callback(link)* to be called.
|
|
"""
|
|
self.callbacks.link_closed = callback
|
|
|
|
def set_packet_callback(self, callback):
|
|
"""
|
|
Registers a function to be called when a packet has been
|
|
received over this link.
|
|
|
|
:param callback: A function or method with the signature *callback(message, packet)* to be called.
|
|
"""
|
|
self.callbacks.packet = callback
|
|
|
|
def set_resource_callback(self, callback):
|
|
"""
|
|
Registers a function to be called when a resource has been
|
|
advertised over this link. If the function returns *True*
|
|
the resource will be accepted. If it returns *False* it will
|
|
be ignored.
|
|
|
|
:param callback: A function or method with the signature *callback(resource)* to be called. Please note that only the basic information of the resource is available at this time, such as *get_transfer_size()*, *get_data_size()*, *get_parts()* and *is_compressed()*.
|
|
"""
|
|
self.callbacks.resource = callback
|
|
|
|
def set_resource_started_callback(self, callback):
|
|
"""
|
|
Registers a function to be called when a resource has begun
|
|
transferring over this link.
|
|
|
|
:param callback: A function or method with the signature *callback(resource)* to be called.
|
|
"""
|
|
self.callbacks.resource_started = callback
|
|
|
|
def set_resource_concluded_callback(self, callback):
|
|
"""
|
|
Registers a function to be called when a resource has concluded
|
|
transferring over this link.
|
|
|
|
:param callback: A function or method with the signature *callback(resource)* to be called.
|
|
"""
|
|
self.callbacks.resource_concluded = callback
|
|
|
|
def set_remote_identified_callback(self, callback):
|
|
"""
|
|
Registers a function to be called when an initiating peer has
|
|
identified over this link.
|
|
|
|
:param callback: A function or method with the signature *callback(link, identity)* to be called.
|
|
"""
|
|
self.callbacks.remote_identified = callback
|
|
|
|
def resource_concluded(self, resource):
|
|
if resource in self.incoming_resources:
|
|
self.incoming_resources.remove(resource)
|
|
if resource in self.outgoing_resources:
|
|
self.outgoing_resources.remove(resource)
|
|
|
|
def set_resource_strategy(self, resource_strategy):
|
|
"""
|
|
Sets the resource strategy for the link.
|
|
|
|
:param resource_strategy: One of ``RNS.Link.ACCEPT_NONE``, ``RNS.Link.ACCEPT_ALL`` or ``RNS.Link.ACCEPT_APP``. If ``RNS.Link.ACCEPT_APP`` is set, the `resource_callback` will be called to determine whether the resource should be accepted or not.
|
|
:raises: *TypeError* if the resource strategy is unsupported.
|
|
"""
|
|
if not resource_strategy in Link.resource_strategies:
|
|
raise TypeError("Unsupported resource strategy")
|
|
else:
|
|
self.resource_strategy = resource_strategy
|
|
|
|
def register_outgoing_resource(self, resource):
|
|
self.outgoing_resources.append(resource)
|
|
|
|
def register_incoming_resource(self, resource):
|
|
self.incoming_resources.append(resource)
|
|
|
|
def has_incoming_resource(self, resource):
|
|
for incoming_resource in self.incoming_resources:
|
|
if incoming_resource.hash == resource.hash:
|
|
return True
|
|
|
|
return False
|
|
|
|
def cancel_outgoing_resource(self, resource):
|
|
if resource in self.outgoing_resources:
|
|
self.outgoing_resources.remove(resource)
|
|
else:
|
|
RNS.log("Attempt to cancel a non-existing outgoing resource", RNS.LOG_ERROR)
|
|
|
|
def cancel_incoming_resource(self, resource):
|
|
if resource in self.incoming_resources:
|
|
self.incoming_resources.remove(resource)
|
|
else:
|
|
RNS.log("Attempt to cancel a non-existing incoming resource", RNS.LOG_ERROR)
|
|
|
|
def ready_for_new_resource(self):
|
|
if len(self.outgoing_resources) > 0:
|
|
return False
|
|
else:
|
|
return True
|
|
|
|
def __str__(self):
|
|
return RNS.prettyhexrep(self.link_id)
|
|
|
|
|
|
class RequestReceipt():
|
|
"""
|
|
An instance of this class is returned by the ``request`` method of ``RNS.Link``
|
|
instances. It should never be instantiated manually. It provides methods to
|
|
check status, response time and response data when the request concludes.
|
|
"""
|
|
|
|
FAILED = 0x00
|
|
SENT = 0x01
|
|
DELIVERED = 0x02
|
|
RECEIVING = 0x03
|
|
READY = 0x04
|
|
|
|
def __init__(self, link, packet_receipt = None, resource = None, response_callback = None, failed_callback = None, progress_callback = None, timeout = None, request_size = None):
|
|
self.packet_receipt = packet_receipt
|
|
self.resource = resource
|
|
self.started_at = None
|
|
|
|
if self.packet_receipt != None:
|
|
self.hash = packet_receipt.truncated_hash
|
|
self.packet_receipt.set_timeout_callback(self.request_timed_out)
|
|
self.started_at = time.time()
|
|
|
|
elif self.resource != None:
|
|
self.hash = resource.request_id
|
|
resource.set_callback(self.request_resource_concluded)
|
|
|
|
self.link = link
|
|
self.request_id = self.hash
|
|
self.request_size = request_size
|
|
|
|
self.response = None
|
|
self.response_transfer_size = None
|
|
self.response_size = None
|
|
self.status = RequestReceipt.SENT
|
|
self.sent_at = time.time()
|
|
self.progress = 0
|
|
self.concluded_at = None
|
|
self.response_concluded_at = None
|
|
|
|
if timeout != None:
|
|
self.timeout = timeout
|
|
else:
|
|
raise ValueError("No timeout specified for request receipt")
|
|
|
|
self.callbacks = RequestReceiptCallbacks()
|
|
self.callbacks.response = response_callback
|
|
self.callbacks.failed = failed_callback
|
|
self.callbacks.progress = progress_callback
|
|
|
|
self.link.pending_requests.append(self)
|
|
|
|
|
|
def request_resource_concluded(self, resource):
|
|
if resource.status == RNS.Resource.COMPLETE:
|
|
RNS.log("Request "+RNS.prettyhexrep(self.request_id)+" successfully sent as resource.", RNS.LOG_DEBUG)
|
|
self.started_at = time.time()
|
|
self.status = RequestReceipt.DELIVERED
|
|
self.__resource_response_timeout = time.time()+self.timeout
|
|
response_timeout_thread = threading.Thread(target=self.__response_timeout_job)
|
|
response_timeout_thread.daemon = True
|
|
response_timeout_thread.start()
|
|
else:
|
|
RNS.log("Sending request "+RNS.prettyhexrep(self.request_id)+" as resource failed with status: "+RNS.hexrep([resource.status]), RNS.LOG_DEBUG)
|
|
self.status = RequestReceipt.FAILED
|
|
self.concluded_at = time.time()
|
|
self.link.pending_requests.remove(self)
|
|
|
|
if self.callbacks.failed != None:
|
|
try:
|
|
self.callbacks.failed(self)
|
|
except Exception as e:
|
|
RNS.log("Error while executing request failed callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
|
|
def __response_timeout_job(self):
|
|
while self.status == RequestReceipt.DELIVERED:
|
|
now = time.time()
|
|
if now > self.__resource_response_timeout:
|
|
self.request_timed_out(None)
|
|
|
|
time.sleep(0.1)
|
|
|
|
|
|
def request_timed_out(self, packet_receipt):
|
|
self.status = RequestReceipt.FAILED
|
|
self.concluded_at = time.time()
|
|
self.link.pending_requests.remove(self)
|
|
|
|
if self.callbacks.failed != None:
|
|
try:
|
|
self.callbacks.failed(self)
|
|
except Exception as e:
|
|
RNS.log("Error while executing request timed out callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
|
|
def response_resource_progress(self, resource):
|
|
if not self.status == RequestReceipt.FAILED:
|
|
self.status = RequestReceipt.RECEIVING
|
|
if self.packet_receipt != None:
|
|
self.packet_receipt.status = RNS.PacketReceipt.DELIVERED
|
|
self.packet_receipt.proved = True
|
|
self.packet_receipt.concluded_at = time.time()
|
|
if self.packet_receipt.callbacks.delivery != None:
|
|
self.packet_receipt.callbacks.delivery(self.packet_receipt)
|
|
|
|
self.progress = resource.get_progress()
|
|
|
|
if self.callbacks.progress != None:
|
|
try:
|
|
self.callbacks.progress(self)
|
|
except Exception as e:
|
|
RNS.log("Error while executing response progress callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
else:
|
|
resource.cancel()
|
|
|
|
|
|
def response_received(self, response):
|
|
if not self.status == RequestReceipt.FAILED:
|
|
self.progress = 1.0
|
|
self.response = response
|
|
self.status = RequestReceipt.READY
|
|
self.response_concluded_at = time.time()
|
|
|
|
if self.packet_receipt != None:
|
|
self.packet_receipt.status = RNS.PacketReceipt.DELIVERED
|
|
self.packet_receipt.proved = True
|
|
self.packet_receipt.concluded_at = time.time()
|
|
if self.packet_receipt.callbacks.delivery != None:
|
|
self.packet_receipt.callbacks.delivery(self.packet_receipt)
|
|
|
|
if self.callbacks.progress != None:
|
|
try:
|
|
self.callbacks.progress(self)
|
|
except Exception as e:
|
|
RNS.log("Error while executing response progress callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
if self.callbacks.response != None:
|
|
try:
|
|
self.callbacks.response(self)
|
|
except Exception as e:
|
|
RNS.log("Error while executing response received callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
def get_request_id(self):
|
|
"""
|
|
:returns: The request ID as *bytes*.
|
|
"""
|
|
return self.request_id
|
|
|
|
def get_status(self):
|
|
"""
|
|
:returns: The current status of the request, one of ``RNS.RequestReceipt.FAILED``, ``RNS.RequestReceipt.SENT``, ``RNS.RequestReceipt.DELIVERED``, ``RNS.RequestReceipt.READY``.
|
|
"""
|
|
return self.status
|
|
|
|
def get_progress(self):
|
|
"""
|
|
:returns: The progress of a response being received as a *float* between 0.0 and 1.0.
|
|
"""
|
|
return self.progress
|
|
|
|
def get_response(self):
|
|
"""
|
|
:returns: The response as *bytes* if it is ready, otherwise *None*.
|
|
"""
|
|
if self.status == RequestReceipt.READY:
|
|
return self.response
|
|
else:
|
|
return None
|
|
|
|
def get_response_time(self):
|
|
"""
|
|
:returns: The response time of the request in seconds.
|
|
"""
|
|
if self.status == RequestReceipt.READY:
|
|
return self.response_concluded_at - self.started_at
|
|
else:
|
|
return None
|
|
|
|
|
|
|
|
class RequestReceiptCallbacks:
|
|
def __init__(self):
|
|
self.response = None
|
|
self.failed = None
|
|
self.progress = None
|