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Validate propagation node data before logging it

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This commit is contained in:
Mark Qvist 2024-11-17 11:43:03 +01:00
parent c14699151d
commit 46450098b4
1 changed files with 32 additions and 23 deletions
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55
sbapp/sideband/core.py
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@ -10,6 +10,7 @@ import shlex
import RNS.vendor.umsgpack as msgpack import RNS.vendor.umsgpack as msgpack
import RNS.Interfaces.Interface as Interface import RNS.Interfaces.Interface as Interface
from LXMF import pn_announce_data_is_valid
import multiprocessing.connection import multiprocessing.connection
@ -46,35 +47,42 @@ class PropagationNodeDetector():
def received_announce(self, destination_hash, announced_identity, app_data): def received_announce(self, destination_hash, announced_identity, app_data):
try: try:
if app_data != None and len(app_data) > 0: if app_data != None and len(app_data) > 0:
unpacked = msgpack.unpackb(app_data) if pn_announce_data_is_valid(app_data):
node_active = unpacked[0] unpacked = msgpack.unpackb(app_data)
emitted = unpacked[1] node_active = unpacked[0]
hops = RNS.Transport.hops_to(destination_hash) emitted = unpacked[1]
hops = RNS.Transport.hops_to(destination_hash)
age = time.time() - emitted age = time.time() - emitted
if age < 0: if age < 0:
RNS.log("Warning, propagation node announce emitted in the future, possible timing inconsistency or tampering attempt.") RNS.log("Warning, propagation node announce emitted in the future, possible timing inconsistency or tampering attempt.")
if age < -1*PropagationNodeDetector.EMITTED_DELTA_GRACE: if age < -1*PropagationNodeDetector.EMITTED_DELTA_GRACE:
raise ValueError("Announce timestamp too far in the future, discarding it") raise ValueError("Announce timestamp too far in the future, discarding it")
if age > -1*PropagationNodeDetector.EMITTED_DELTA_IGNORE: if age > -1*PropagationNodeDetector.EMITTED_DELTA_IGNORE:
# age = 0 # age = 0
pass pass
RNS.log("Detected active propagation node "+RNS.prettyhexrep(destination_hash)+" emission "+str(age)+" seconds ago, "+str(hops)+" hops away") RNS.log("Detected active propagation node "+RNS.prettyhexrep(destination_hash)+" emission "+str(age)+" seconds ago, "+str(hops)+" hops away")
self.owner.log_announce(destination_hash, RNS.prettyhexrep(destination_hash).encode("utf-8"), dest_type=PropagationNodeDetector.aspect_filter) self.owner.log_announce(destination_hash, app_data, dest_type=PropagationNodeDetector.aspect_filter)
if self.owner.config["lxmf_propagation_node"] == None: if self.owner.config["lxmf_propagation_node"] == None:
if self.owner.active_propagation_node == None: if self.owner.active_propagation_node == None:
self.owner.set_active_propagation_node(destination_hash)
else:
prev_hops = RNS.Transport.hops_to(self.owner.active_propagation_node)
if hops <= prev_hops:
self.owner.set_active_propagation_node(destination_hash) self.owner.set_active_propagation_node(destination_hash)
else: else:
pass prev_hops = RNS.Transport.hops_to(self.owner.active_propagation_node)
if hops <= prev_hops:
self.owner.set_active_propagation_node(destination_hash)
else:
pass
else:
pass
else: else:
pass RNS.log(f"Received malformed propagation node announce from {RNS.prettyhexrep(destination_hash)} with data: {app_data}", RNS.LOG_DEBUG)
else:
RNS.log(f"Received malformed propagation node announce from {RNS.prettyhexrep(destination_hash)} with data: {app_data}", RNS.LOG_DEBUG)
except Exception as e: except Exception as e:
RNS.log("Error while processing received propagation node announce: "+str(e)) RNS.log("Error while processing received propagation node announce: "+str(e))
@ -910,7 +918,8 @@ class SidebandCore():
try: try:
if app_data == None: if app_data == None:
app_data = b"" app_data = b""
app_data = msgpack.packb([app_data, stamp_cost]) if type(app_data) != bytes:
app_data = msgpack.packb([app_data, stamp_cost])
RNS.log("Received "+str(dest_type)+" announce for "+RNS.prettyhexrep(dest)+" with data: "+str(app_data), RNS.LOG_DEBUG) RNS.log("Received "+str(dest_type)+" announce for "+RNS.prettyhexrep(dest)+" with data: "+str(app_data), RNS.LOG_DEBUG)
self._db_save_announce(dest, app_data, dest_type) self._db_save_announce(dest, app_data, dest_type)
self.setstate("app.flags.new_announces", True) self.setstate("app.flags.new_announces", True)