Ensure that a DataTLV is not too long

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

squinnondation/messages.py

@@ -183,6 +183,11 @@ class DataTLV(TLV):
     nonce: int
     data: bytes
 
+    def validate_data(self) -> bool:
+        if len(self.data) >= 256 - 4 - 8:
+            raise ValueError("The data is too long, the length is larger that one byte.")
+        return True
+
     def unmarshal(self, raw_data: bytes) -> None:
         self.type = raw_data[0]
         self.length = raw_data[1]
@@ -305,7 +310,7 @@ class Packet:
             raise ValueError("The magic code of the packet must be 95, found: {:d}".format(self.magic))
         if self.version != 0:
             raise ValueError("The version of the packet is not supported: {:d}".format(self.version))
-        if not (0 <= self.body_length <= 120):
+        if not (0 <= self.body_length <= 1200):
             raise ValueError("The body length of the packet is negative or too high. It must be between 0 and 1020,"
                              "found: {:d}".format(self.body_length))
         return all(tlv.validate_data() for tlv in self.body)