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Fixed race condition for link initiators on timed out link establishment

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This commit is contained in:
Mark Qvist 2023-06-13 16:10:47 +02:00
parent 97f97eb063
commit bab779a34c
3 changed files with 49 additions and 38 deletions
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83
RNS/Link.py
View File

@ -264,41 +264,50 @@ class Link:
self.had_outbound() self.had_outbound()
def validate_proof(self, packet): def validate_proof(self, packet):
if self.status == Link.PENDING: try:
if self.initiator and len(packet.data) == RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2: if self.status == Link.PENDING:
peer_pub_bytes = packet.data[RNS.Identity.SIGLENGTH//8:RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2] if self.initiator and len(packet.data) == RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2:
peer_sig_pub_bytes = self.destination.identity.get_public_key()[Link.ECPUBSIZE//2:Link.ECPUBSIZE] peer_pub_bytes = packet.data[RNS.Identity.SIGLENGTH//8:RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2]
self.load_peer(peer_pub_bytes, peer_sig_pub_bytes) peer_sig_pub_bytes = self.destination.identity.get_public_key()[Link.ECPUBSIZE//2:Link.ECPUBSIZE]
self.handshake() self.load_peer(peer_pub_bytes, peer_sig_pub_bytes)
self.handshake()
self.establishment_cost += len(packet.raw) self.establishment_cost += len(packet.raw)
signed_data = self.link_id+self.peer_pub_bytes+self.peer_sig_pub_bytes signed_data = self.link_id+self.peer_pub_bytes+self.peer_sig_pub_bytes
signature = packet.data[:RNS.Identity.SIGLENGTH//8] signature = packet.data[:RNS.Identity.SIGLENGTH//8]
if self.destination.identity.validate(signature, signed_data):
self.rtt = time.time() - self.request_time
self.attached_interface = packet.receiving_interface
self.__remote_identity = self.destination.identity
self.status = Link.ACTIVE
self.activated_at = time.time()
self.last_proof = self.activated_at
RNS.Transport.activate_link(self)
RNS.log("Link "+str(self)+" established with "+str(self.destination)+", RTT is "+str(round(self.rtt, 3))+"s", RNS.LOG_VERBOSE)
if self.rtt != None and self.establishment_cost != None and self.rtt > 0 and self.establishment_cost > 0: if self.destination.identity.validate(signature, signed_data):
self.establishment_rate = self.establishment_cost/self.rtt if self.status != Link.PENDING:
raise IOError("Invalid link state for proof validation")
rtt_data = umsgpack.packb(self.rtt) self.rtt = time.time() - self.request_time
rtt_packet = RNS.Packet(self, rtt_data, context=RNS.Packet.LRRTT) self.attached_interface = packet.receiving_interface
rtt_packet.send() self.__remote_identity = self.destination.identity
self.had_outbound() self.status = Link.ACTIVE
self.activated_at = time.time()
self.last_proof = self.activated_at
RNS.Transport.activate_link(self)
RNS.log("Link "+str(self)+" established with "+str(self.destination)+", RTT is "+str(round(self.rtt, 3))+"s", RNS.LOG_VERBOSE)
if self.rtt != None and self.establishment_cost != None and self.rtt > 0 and self.establishment_cost > 0:
self.establishment_rate = self.establishment_cost/self.rtt
if self.callbacks.link_established != None: rtt_data = umsgpack.packb(self.rtt)
thread = threading.Thread(target=self.callbacks.link_established, args=(self,)) rtt_packet = RNS.Packet(self, rtt_data, context=RNS.Packet.LRRTT)
thread.daemon = True rtt_packet.send()
thread.start() self.had_outbound()
else:
RNS.log("Invalid link proof signature received by "+str(self)+". Ignoring.", RNS.LOG_DEBUG) if self.callbacks.link_established != None:
thread = threading.Thread(target=self.callbacks.link_established, args=(self,))
thread.daemon = True
thread.start()
else:
RNS.log("Invalid link proof signature received by "+str(self)+". Ignoring.", RNS.LOG_DEBUG)
except Exception as e:
self.status = Link.CLOSED
RNS.log("An error ocurred while validating link request proof on "+str(self)+".", RNS.LOG_ERROR)
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
def identify(self, identity): def identify(self, identity):
@ -520,16 +529,16 @@ class Link:
next_check = self.request_time + self.establishment_timeout next_check = self.request_time + self.establishment_timeout
sleep_time = next_check - time.time() sleep_time = next_check - time.time()
if time.time() >= self.request_time + self.establishment_timeout: 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.status = Link.CLOSED
self.teardown_reason = Link.TIMEOUT self.teardown_reason = Link.TIMEOUT
self.link_closed() self.link_closed()
sleep_time = 0.001 sleep_time = 0.001
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)
elif self.status == Link.ACTIVE: elif self.status == Link.ACTIVE:
activated_at = self.activated_at if self.activated_at != None else 0 activated_at = self.activated_at if self.activated_at != None else 0
last_inbound = max(max(self.last_inbound, self.last_proof), activated_at) last_inbound = max(max(self.last_inbound, self.last_proof), activated_at)
@ -847,7 +856,7 @@ class Link:
try: try:
self.fernet = Fernet(self.derived_key) self.fernet = Fernet(self.derived_key)
except Exception as e: 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) RNS.log("Could not instantiate Fernet while performin encryption on link "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
raise e raise e
return self.fernet.encrypt(plaintext) return self.fernet.encrypt(plaintext)

2
RNS/Transport.py
View File

@ -1741,6 +1741,8 @@ class Transport:
def activate_link(link): def activate_link(link):
RNS.log("Activating link "+str(link), RNS.LOG_EXTREME) RNS.log("Activating link "+str(link), RNS.LOG_EXTREME)
if link in Transport.pending_links: if link in Transport.pending_links:
if link.status != Link.PENDING:
raise IOError("Invalid link state for link activation")
Transport.pending_links.remove(link) Transport.pending_links.remove(link)
Transport.active_links.append(link) Transport.active_links.append(link)
link.status = RNS.Link.ACTIVE link.status = RNS.Link.ACTIVE

2
RNS/_version.py
View File

@ -1 +1 @@
__version__ = "0.5.4" __version__ = "0.5.5"