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Work on tunnels

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This commit is contained in:
Mark Qvist 2021-09-18 18:11:23 +02:00
parent 6d6c91edaf
commit ce00822cb0
2 changed files with 66 additions and 0 deletions
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1
RNS/Interfaces/TCPInterface.py
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@ -53,6 +53,7 @@ class TCPClientInterface(Interface):
thread = threading.Thread(target=self.read_loop)
thread.setDaemon(True)
thread.start()
self.wants_tunnel = True
def processIncoming(self, data):
self.owner.inbound(data, self)

65
RNS/Transport.py
View File

@ -64,6 +64,7 @@ class Transport:
link_table = {} # A lookup table containing hops for links
held_announces = {} # A table containing temporarily held announce-table entries
announce_handlers = [] # A table storing externally registered announce handlers
transport_tunnels = {} # A table storing tunnels to other transport instances
# Transport control destinations are used
# for control purposes like path requests
@ -119,6 +120,11 @@ class Transport:
Transport.control_destinations.append(Transport.path_request_destination)
Transport.control_hashes.append(Transport.path_request_destination.hash)
Transport.tunnel_synthesize_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, Transport.APP_NAME, "tunnel", "synthesize")
Transport.tunnel_synthesize_destination.set_packet_callback(Transport.tunnel_synthesize_handler)
Transport.control_destinations.append(Transport.tunnel_synthesize_handler)
Transport.control_hashes.append(Transport.tunnel_synthesize_destination.hash)
thread = threading.Thread(target=Transport.jobloop)
thread.setDaemon(True)
thread.start()
@ -170,6 +176,10 @@ class Transport:
RNS.log("Transport instance "+str(Transport.identity)+" started")
for interface in Transport.interfaces:
if hasattr(interface, "wants_tunnel") and interface.wants_tunnel:
Transport.synthesize_tunnel(interface)
@staticmethod
def jobloop():
while (True):
@ -395,6 +405,7 @@ class Transport:
if should_transmit:
if not stored_hash:
Transport.packet_hashlist.append(packet.packet_hash)
stored_hash = True
interface.processOutgoing(packet.raw)
sent = True
@ -898,6 +909,60 @@ class Transport:
Transport.jobs_locked = False
@staticmethod
def synthesize_tunnel(interface):
interface_hash = interface.get_hash()
public_key = RNS.Transport.identity.get_public_key()
random_hash = RNS.Identity.get_random_hash()
tunnel_id_data = public_key+interface_hash
tunnel_id = RNS.Identity.full_hash(tunnel_id_data)
signed_data = tunnel_id_data+random_hash
signature = Transport.identity.sign(signed_data)
data = signed_data+signature
tnl_snth_dst = RNS.Destination(None, RNS.Destination.OUT, RNS.Destination.PLAIN, Transport.APP_NAME, "tunnel", "synthesize")
# TODO: Remove
RNS.log("Tunnel synth for "+str(interface))
RNS.log("Transport ID : "+str(Transport.identity))
RNS.log("Tunnel ID : "+RNS.hexrep(tunnel_id))
RNS.log("Public key : "+RNS.hexrep(public_key))
RNS.log("Signature : "+RNS.hexrep(signature))
packet = RNS.Packet(tnl_snth_dst, data, packet_type = RNS.Packet.DATA, transport_type = RNS.Transport.BROADCAST, header_type = RNS.Packet.HEADER_1, attached_interface = interface)
packet.send()
interface.wants_tunnel = False
@staticmethod
def tunnel_synthesize_handler(data, packet):
# TODO: Remove
RNS.log("Received tunnel synthesize packet ("+str(len(data))+"):\n"+RNS.hexrep(data))
expected_length = RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8+RNS.Reticulum.TRUNCATED_HASHLENGTH//8+RNS.Identity.SIGLENGTH//8
if len(data) == expected_length:
tunnel_id = RNS.Identity.full_hash(data[:RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH])
public_key = data[:RNS.Identity.KEYSIZE//8]
signature = data[RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8+RNS.Reticulum.TRUNCATED_HASHLENGTH//8:expected_length]
remote_transport_identity = RNS.Identity(create_keys=False)
remote_transport_identity.load_public_key(public_key)
RNS.log("Transport ID : "+str(Transport.identity))
RNS.log("Tunnel ID : "+RNS.hexrep(tunnel_id))
RNS.log("Public key : "+RNS.hexrep(public_key))
RNS.log("Signature : "+RNS.hexrep(signature))
if remote_transport_identity.validate(signature):
RNS.log("Signature is valid")
else:
RNS.log("Signature is invalid")
@staticmethod
def register_destination(destination):
destination.MTU = RNS.Reticulum.MTU