2022-12-26 18:20:56 +00:00
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"""
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/*
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* This file is part of the Pico Fido distribution (https://github.com/polhenarejos/pico-fido).
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* Copyright (c) 2022 Pol Henarejos.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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"""
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2022-10-03 14:10:36 +00:00
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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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2022-10-04 18:02:36 +00:00
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from threading import Event, Timer
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from numbers import Number
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2022-12-26 18:20:56 +00:00
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import sys
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try:
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from smartcard.CardType import AnyCardType
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from smartcard.CardRequest import CardRequest
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from smartcard.Exceptions import CardRequestTimeoutException, CardConnectionException
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except ModuleNotFoundError:
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print('ERROR: smarctard module not found! Install pyscard package.\nTry with `pip install pyscard`')
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sys.exit(-1)
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class APDUResponse(Exception):
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def __init__(self, sw1, sw2):
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self.sw1 = sw1
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self.sw2 = sw2
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super().__init__(f'SW:{sw1:02X}{sw2:02X}')
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def send_apdu(card, command, p1, p2, data=None, ne=None):
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lc = []
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dataf = []
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if (data):
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lc = [0x00] + list(len(data).to_bytes(2, 'big'))
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dataf = data
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if (ne is None):
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le = [0x00, 0x00]
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else:
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le = list(ne.to_bytes(2, 'big'))
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if (isinstance(command, list) and len(command) > 1):
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apdu = command
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else:
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apdu = [0x00, command]
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apdu = apdu + [p1, p2] + lc + dataf + le
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try:
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response, sw1, sw2 = card.connection.transmit(apdu)
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except CardConnectionException:
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card.connection.reconnect()
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response, sw1, sw2 = card.connection.transmit(apdu)
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if (sw1 != 0x90):
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raise APDUResponse(sw1, sw2)
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return response
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2022-10-03 14:10:36 +00:00
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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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2022-10-04 14:58:03 +00:00
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return {"id": user_id, "name": name, "displayName": display_name}
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2022-10-03 14:10:36 +00:00
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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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2022-10-04 18:02:36 +00:00
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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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