mirror of
https://github.com/markqvist/LXMF.git
synced 2024-10-01 01:35:36 -04:00
Added signature validation on incoming messages
This commit is contained in:
Mark Qvist
parent
0c32bbcb68
commit
01b5ba60d0
197
LXMF/LXMF.py
197
LXMF/LXMF.py
@ -7,22 +7,26 @@ import RNS.vendor.umsgpack as msgpack
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APP_NAME = "lxmf"
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class LXMessage:
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DRAFT = 0x00
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OUTBOUND = 0x01
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SENDING = 0x02
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SENT = 0x04
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DELIVERED = 0x08
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states = [DRAFT, OUTBOUND, SENDING, SENT, DELIVERED]
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DRAFT = 0x00
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OUTBOUND = 0x01
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SENDING = 0x02
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SENT = 0x04
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DELIVERED = 0x08
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states = [DRAFT, OUTBOUND, SENDING, SENT, DELIVERED]
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UNKNOWN = 0x00
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PACKET = 0x01
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RESOURCE = 0x02
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representations = [UNKNOWN, PACKET, RESOURCE]
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UNKNOWN = 0x00
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PACKET = 0x01
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RESOURCE = 0x02
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representations = [UNKNOWN, PACKET, RESOURCE]
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OPPORTUNISTIC = 0x01
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DIRECT = 0x02
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PROPAGATED = 0x03
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valid_methods = [OPPORTUNISTIC, DIRECT, PROPAGATED]
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OPPORTUNISTIC = 0x01
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DIRECT = 0x02
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PROPAGATED = 0x03
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valid_methods = [OPPORTUNISTIC, DIRECT, PROPAGATED]
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SOURCE_UNKNOWN = 0x01
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SIGNATURE_INVALID = 0x02
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unverified_reasons = [SOURCE_UNKNOWN, SIGNATURE_INVALID]
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DESTINATION_LENGTH = RNS.Identity.TRUNCATED_HASHLENGTH//8
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SIGNATURE_LENGTH = RNS.Identity.SIGLENGTH//8
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@ -100,6 +104,10 @@ class LXMessage:
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self.state = LXMessage.DRAFT
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self.method = LXMessage.UNKNOWN
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self.incoming = False
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self.signature_validated = False
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self.unverified_reason = None
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self.representation = LXMessage.UNKNOWN
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self.desired_method = desired_method
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self.delivery_attempts = 0
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@ -163,57 +171,62 @@ class LXMessage:
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self.__delivery_destination = delivery_destination
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def pack(self):
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self.timestamp = time.time()
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self.payload = [self.timestamp, self.title, self.content, self.fields]
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if not self.packed:
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self.timestamp = time.time()
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self.payload = [self.timestamp, self.title, self.content, self.fields]
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hashed_part = b""
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hashed_part += self.__destination.hash
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hashed_part += self.__source.hash
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hashed_part += msgpack.packb(self.payload)
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self.hash = RNS.Identity.fullHash(hashed_part)
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self.message_id = self.hash
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hashed_part = b""
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hashed_part += self.__destination.hash
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hashed_part += self.__source.hash
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hashed_part += msgpack.packb(self.payload)
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self.hash = RNS.Identity.fullHash(hashed_part)
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self.message_id = self.hash
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signed_part = b""
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signed_part += hashed_part
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signed_part += self.hash
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self.signature = self.__source.sign(signed_part)
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signed_part = b""
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signed_part += hashed_part
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signed_part += self.hash
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self.signature = self.__source.sign(signed_part)
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self.signature_validated = True
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self.packed = b""
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self.packed += self.__destination.hash
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self.packed += self.__source.hash
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self.packed += self.signature
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packed_payload = msgpack.packb(self.payload)
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self.packed += packed_payload
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self.packed_size = len(self.packed)
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content_size = len(packed_payload)
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self.packed = b""
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self.packed += self.__destination.hash
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self.packed += self.__source.hash
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self.packed += self.signature
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packed_payload = msgpack.packb(self.payload)
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self.packed += packed_payload
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self.packed_size = len(self.packed)
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content_size = len(packed_payload)
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# If no desired delivery method has been defined,
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# one will be chosen according to these rules:
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if self.desired_method == None:
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self.desired_method == LXMessage.DIRECT
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# TODO: Expand rules to something more intelligent
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# If no desired delivery method has been defined,
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# one will be chosen according to these rules:
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if self.desired_method == None:
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self.desired_method == LXMessage.DIRECT
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# TODO: Expand rules to something more intelligent
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if self.desired_method == LXMessage.OPPORTUNISTIC:
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if self.__destination.type == RNS.Destination.SINGLE:
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single_packet_content_limit = LXMessage.RSA_PACKET_MAX_CONTENT
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elif self.__destination.type == RNS.Destination.PLAIN:
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single_packet_content_limit = LXMessage.PLAIN_PACKET_MAX_CONTENT
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if self.desired_method == LXMessage.OPPORTUNISTIC:
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if self.__destination.type == RNS.Destination.SINGLE:
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single_packet_content_limit = LXMessage.RSA_PACKET_MAX_CONTENT
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elif self.__destination.type == RNS.Destination.PLAIN:
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single_packet_content_limit = LXMessage.PLAIN_PACKET_MAX_CONTENT
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if content_size > single_packet_content_limit:
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raise TypeError("LXMessage desired opportunistic delivery method, but content exceeds single-packet size.")
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else:
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self.method = LXMessage.OPPORTUNISTIC
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self.representation = LXMessage.PACKET
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self.__delivery_destination = self.__destination
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if content_size > single_packet_content_limit:
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raise TypeError("LXMessage desired opportunistic delivery method, but content exceeds single-packet size.")
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else:
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self.method = LXMessage.OPPORTUNISTIC
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self.representation = LXMessage.PACKET
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self.__delivery_destination = self.__destination
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elif self.desired_method == LXMessage.DIRECT or self.desired_method == LXMessage.PROPAGATED:
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single_packet_content_limit = LXMessage.LINK_PACKET_MAX_CONTENT
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if content_size <= single_packet_content_limit:
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self.method = self.desired_method
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self.representation = LXMessage.PACKET
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else:
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self.method = self.desired_method
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self.representation = LXMessage.RESOURCE
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else:
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raise ValueError("Attempt to re-pack LXMessage "+str(self)+" that was already packed")
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elif self.desired_method == LXMessage.DIRECT or self.desired_method == LXMessage.PROPAGATED:
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single_packet_content_limit = LXMessage.LINK_PACKET_MAX_CONTENT
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if content_size <= single_packet_content_limit:
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self.method = self.desired_method
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self.representation = LXMessage.PACKET
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else:
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self.method = self.desired_method
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self.representation = LXMessage.RESOURCE
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def send(self):
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if self.method == LXMessage.OPPORTUNISTIC:
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@ -274,9 +287,13 @@ class LXMessage:
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source_hash = lxmf_bytes[LXMessage.DESTINATION_LENGTH:2*LXMessage.DESTINATION_LENGTH]
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signature = lxmf_bytes[2*LXMessage.DESTINATION_LENGTH:2*LXMessage.DESTINATION_LENGTH+LXMessage.SIGNATURE_LENGTH]
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packed_payload = lxmf_bytes[2*LXMessage.DESTINATION_LENGTH+LXMessage.SIGNATURE_LENGTH:]
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hashed_part = b"" + destination_hash + source_hash + packed_payload
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message_hash = RNS.Identity.fullHash(hashed_part)
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signed_part = b"" + hashed_part + message_hash
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unpacked_payload = msgpack.unpackb(packed_payload)
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destination = RNS.Identity.recall(destination_hash)
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source = RNS.Identity.recall(source_hash)
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source_identity = RNS.Identity.recall(source_hash)
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source = RNS.Destination(source_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "delivery")
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timestamp = unpacked_payload[0]
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title_bytes = unpacked_payload[1]
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content_bytes = unpacked_payload[2]
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@ -291,15 +308,31 @@ class LXMessage:
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destination_hash = destination_hash,
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source_hash = source_hash)
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message.hash = message_hash
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message.signature = signature
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message.incoming = True
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message.timestamp = timestamp
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message.packed = lxmf_bytes
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message.set_title_from_bytes(title_bytes)
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message.set_content_from_bytes(content_bytes)
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message.timestamp = timestamp
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try:
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if source:
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if source.identity.validate(signature, signed_part):
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message.signature_validated = True
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else:
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message.signature_validated = False
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message.unverified_reason = LXMessage.SIGNATURE_INVALID
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else:
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signature_validated = False
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message.unverified_reason = LXMessage.SOURCE_UNKNOWN
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RNS.log("LXMF message signature could not be validated, since source identity is unknown")
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except Exception as e:
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message.signature_validated = False
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RNS.log("Error while validating LXMF message signature. The contained exception was: "+str(e), RNS.LOG_ERROR)
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return message
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@staticmethod
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def unpack_from_file(lxmf_file_handle):
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pass
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class LXMRouter:
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MAX_DELIVERY_ATTEMPTS = 3
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@ -352,26 +385,30 @@ class LXMRouter:
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def lxmf_delivery(self, lxmf_data, destination_type = None):
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try:
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message = LXMessage.unpack_from_bytes(lxmf_data)
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if RNS.Reticulum.should_allow_unencrypted():
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message.transport_encryption = "Consider unencrypted (Disabling encryption was allowed in Reticulum configuration)"
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else:
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if destination_type == RNS.Destination.SINGLE:
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message.transport_encryption = "RSA-"+str(RNS.Identity.KEYSIZE)
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elif destination_type == RNS.Destination.GROUP:
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message.transport_encryption = "AES-128"
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elif destination_type == RNS.Destination.LINK:
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message.transport_encryption = "EC-SECP256R1"
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else:
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message.transport_encryption = None
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if self.__delivery_callback != None:
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self.__delivery_callback(message)
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return True
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except Exception as e:
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RNS.log("Could not assemble LXMF message from received data", RNS.LOG_NOTICE)
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RNS.log("The contained exception was: "+str(e), RNS.LOG_DEBUG)
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raise e
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return False
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if RNS.Reticulum.should_allow_unencrypted():
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message.transport_encryption = "Consider unencrypted (Disabling encryption was allowed in Reticulum configuration)"
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else:
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if destination_type == RNS.Destination.SINGLE:
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message.transport_encryption = "RSA-"+str(RNS.Identity.KEYSIZE)
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elif destination_type == RNS.Destination.GROUP:
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message.transport_encryption = "AES-128"
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elif destination_type == RNS.Destination.LINK:
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message.transport_encryption = "EC-SECP256R1"
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else:
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message.transport_encryption = None
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if self.__delivery_callback != None:
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self.__delivery_callback(message)
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return True
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def delivery_packet(self, data, packet):
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try:
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@ -404,7 +441,7 @@ class LXMRouter:
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def resource_transfer_concluded(self, resource):
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RNS.log("Transfer concluded for resource "+str(resource), RNS.LOG_DEBUG)
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if resource.status == RNS.Resource.COMPLETE:
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self.lxmf_delivery(resource.data, resource.link.type)
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self.lxmf_delivery(resource.data.read(), resource.link.type)
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def jobloop(self):
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while (True):
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