118 lines
3.9 KiB
Python
118 lines
3.9 KiB
Python
from fido2.webauthn import AttestedCredentialData
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import random
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import string
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import secrets
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import math
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from threading import Event, Timer
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from numbers import Number
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def verify(MC, GA, client_data_hash):
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credential_data = AttestedCredentialData(MC.auth_data.credential_data)
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GA.verify(client_data_hash, credential_data.public_key)
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def generate_random_user():
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# https://www.w3.org/TR/webauthn/#user-handle
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user_id_length = random.randint(1, 64)
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user_id = secrets.token_bytes(user_id_length)
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# https://www.w3.org/TR/webauthn/#dictionary-pkcredentialentity
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name = "User name"
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display_name = "Displayed " + name
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return {"id": user_id, "name": name, "displayName": display_name}
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counter = 1
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def generate_user_maximum():
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"""
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Generate RK with the maximum lengths of the fields, according to the minimal requirements of the FIDO2 spec
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"""
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global counter
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# https://www.w3.org/TR/webauthn/#user-handle
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user_id_length = 64
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user_id = secrets.token_bytes(user_id_length)
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# https://www.w3.org/TR/webauthn/#dictionary-pkcredentialentity
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name = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in range(64))
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name = f"{counter}: {name}"
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icon = "https://www.w3.org/TR/webauthn/" + "A" * 128
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display_name = "Displayed " + name
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name = name[:64]
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display_name = display_name[:64]
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icon = icon[:128]
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counter += 1
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return {"id": user_id, "name": name, "icon": icon, "displayName": display_name}
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def shannon_entropy(data):
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s = 0.0
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total = len(data)
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for x in range(0, 256):
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freq = data.count(x)
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p = freq / total
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if p > 0:
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s -= p * math.log2(p)
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return s
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# Timeout from:
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# https://github.com/Yubico/python-fido2/blob/f1dc028d6158e1d6d51558f72055c65717519b9b/fido2/utils.py
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# Copyright (c) 2013 Yubico AB
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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class Timeout(object):
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"""Utility class for adding a timeout to an event.
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:param time_or_event: A number, in seconds, or a threading.Event object.
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:ivar event: The Event associated with the Timeout.
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:ivar timer: The Timer associated with the Timeout, if any.
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"""
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def __init__(self, time_or_event):
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if isinstance(time_or_event, Number):
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self.event = Event()
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self.timer = Timer(time_or_event, self.event.set)
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else:
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self.event = time_or_event
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self.timer = None
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def __enter__(self):
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if self.timer:
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self.timer.start()
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return self.event
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def __exit__(self, exc_type, exc_val, exc_tb):
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if self.timer:
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self.timer.cancel()
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self.timer.join()
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