tlsfuzzer / tlsfuzzer

Feature request

Does tlsfuzzer have some method to get a message in HEX form before sending and modify it (in HEX form) and send via tlsfuzzer after that?

There isn't a ready to use way to display the message before sending, but it shouldn't be too hard to add something like that.
fuzz_message() here:

tlsfuzzer/tlsfuzzer/messages.py

Line 1666 in 309fe03

def fuzz_message(generator, substitutions=None, xors=None):

can modify any byte of the message before it's sent, so instead of calling substitute_and_xor() on data, you could do print(data.hex()) to get the hex-encoded message.

Sending hex-encoded message is supported, see RawMessageGenerator() for that. You'll need to convert the hex-encoded bytes to bytes() or bytearray() first, with something like bytes.fromhex('deadbeef').

(If you want compatibility with very old pythons, you may want to use the a2b_hex() and b2a_hex() functions from tlslite-ng instead: https://github.com/tlsfuzzer/tlslite-ng/blob/4b5efc2285f114b437f6f1678617af3ca0e0fbc5/tlslite/utils/compat.py#L52 )

Unfortunately, if we will take data from this place - it will be not full.
I can get data modifying method send() from tlslite\bufferedsocket.py
But when I try to modify hex data and send it like that my TLS message is sending incorrectly...

class BufferedSocket(object):
    def send(self, data):
          data = my_mod_data
          if self.buffer_writes:
          self._write_queue.append(data)
          return len(data)
          return self.socket.send(data)

what do you mean by not full? it is the complete message; it does not include the record layer but that's by design, how messages are fragmented is separate from their contents

How to get ClientHello message in HEX form before sending?

Feature request