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# Copyright (c) 2024 Yubico AB
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
"""
Utilities for common functionality used by several examples in this directory.
"""
from fido2.hid import CtapHidDevice
from fido2.client import Fido2Client, WindowsClient, UserInteraction
from getpass import getpass
import ctypes
try:
from fido2.pcsc import CtapPcscDevice
except ImportError:
CtapPcscDevice = None
# Handle user interaction via CLI prompts
class CliInteraction(UserInteraction):
def __init__(self):
self._pin = None
def prompt_up(self):
print("\nTouch your authenticator device now...\n")
def request_pin(self, permissions, rd_id):
if not self._pin:
self._pin = getpass("Enter PIN: ")
return self._pin
def request_uv(self, permissions, rd_id):
print("User Verification required.")
return True
def enumerate_devices():
for dev in CtapHidDevice.list_devices():
yield dev
if CtapPcscDevice:
for dev in CtapPcscDevice.list_devices():
yield dev
def get_client(predicate=None, **kwargs):
"""Locate a CTAP device suitable for use.
If running on Windows as non-admin, the predicate check will be skipped and
a webauthn.dll based client will be returned.
Extra kwargs will be passed to the constructor of Fido2Client.
"""
if WindowsClient.is_available() and not ctypes.windll.shell32.IsUserAnAdmin():
# Use the Windows WebAuthn API if available, and we're not running as admin
return WindowsClient("https://example.com")
user_interaction = kwargs.pop("user_interaction", None) or CliInteraction()
# Locate a device
for dev in enumerate_devices():
# Set up a FIDO 2 client using the origin https://example.com
client = Fido2Client(
dev,
"https://example.com",
user_interaction=user_interaction,
**kwargs,
)
# Check if it is suitable for use
if predicate is None or predicate(client):
return client
else:
raise ValueError("No suitable Authenticator found!")
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