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Improved malformed packet detection

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This commit is contained in:
Mark Qvist 2022-01-11 03:06:16 +01:00
parent 4253175627
commit fdaa58a6fa
3 changed files with 28 additions and 20 deletions
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2
RNS/Link.py
View File

@ -765,7 +765,7 @@ class Link:
return plaintext return plaintext
except Exception as e: except Exception as e:
RNS.log("Decryption failed on link "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR) RNS.log("Decryption failed on link "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
RNS.log(traceback.format_exc(), RNS.LOG_ERROR) # RNS.log(traceback.format_exc(), RNS.LOG_ERROR)
# TODO: Think long about implications here # TODO: Think long about implications here
# self.teardown() # self.teardown()

42
RNS/Packet.py
View File

@ -185,27 +185,33 @@ class Packet:
def unpack(self): def unpack(self):
self.flags = self.raw[0] try:
self.hops = self.raw[1] self.flags = self.raw[0]
self.hops = self.raw[1]
self.header_type = (self.flags & 0b11000000) >> 6 self.header_type = (self.flags & 0b11000000) >> 6
self.transport_type = (self.flags & 0b00110000) >> 4 self.transport_type = (self.flags & 0b00110000) >> 4
self.destination_type = (self.flags & 0b00001100) >> 2 self.destination_type = (self.flags & 0b00001100) >> 2
self.packet_type = (self.flags & 0b00000011) self.packet_type = (self.flags & 0b00000011)
if self.header_type == Packet.HEADER_2: if self.header_type == Packet.HEADER_2:
self.transport_id = self.raw[2:12] self.transport_id = self.raw[2:12]
self.destination_hash = self.raw[12:22] self.destination_hash = self.raw[12:22]
self.context = ord(self.raw[22:23]) self.context = ord(self.raw[22:23])
self.data = self.raw[23:] self.data = self.raw[23:]
else: else:
self.transport_id = None self.transport_id = None
self.destination_hash = self.raw[2:12] self.destination_hash = self.raw[2:12]
self.context = ord(self.raw[12:13]) self.context = ord(self.raw[12:13])
self.data = self.raw[13:] self.data = self.raw[13:]
self.packed = False self.packed = False
self.update_hash() self.update_hash()
return True
except Exception as e:
RNS.log("Received malformed packet, dropping it. The contained exception was: "+str(e), RNS.LOG_EXTREME)
return False
def send(self): def send(self):
""" """

4
RNS/Transport.py
View File

@ -585,7 +585,9 @@ class Transport:
Transport.jobs_locked = True Transport.jobs_locked = True
packet = RNS.Packet(None, raw) packet = RNS.Packet(None, raw)
packet.unpack() if not packet.unpack():
return
packet.receiving_interface = interface packet.receiving_interface = interface
packet.hops += 1 packet.hops += 1