mirror of https://github.com/Yubico/python-fido2
153 lines
5.6 KiB
Python
153 lines
5.6 KiB
Python
# Copyright (c) 2021 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.
|
|
|
|
"""
|
|
This example shows how to use an AttestationVerifier to only allow credentials signed
|
|
by a specific CA.
|
|
|
|
It connects to the first FIDO device found (starts from USB, then looks into NFC),
|
|
creates a new credential for it, and verifies that attestation is signed by the
|
|
Yubico FIDO root CA (this will only work for Yubico devices).
|
|
On Windows, the native WebAuthn API will be used.
|
|
"""
|
|
from fido2.hid import CtapHidDevice
|
|
from fido2.client import Fido2Client, WindowsClient, UserInteraction
|
|
from fido2.server import Fido2Server
|
|
from fido2.attestation import AttestationVerifier
|
|
from base64 import b64decode
|
|
from getpass import getpass
|
|
import sys
|
|
import ctypes
|
|
|
|
|
|
# Official Yubico root CA for FIDO Authenticators
|
|
YUBICO_CA = b64decode(
|
|
"""
|
|
MIIDHjCCAgagAwIBAgIEG0BT9zANBgkqhkiG9w0BAQsFADAuMSwwKgYDVQQDEyNZ
|
|
dWJpY28gVTJGIFJvb3QgQ0EgU2VyaWFsIDQ1NzIwMDYzMTAgFw0xNDA4MDEwMDAw
|
|
MDBaGA8yMDUwMDkwNDAwMDAwMFowLjEsMCoGA1UEAxMjWXViaWNvIFUyRiBSb290
|
|
IENBIFNlcmlhbCA0NTcyMDA2MzEwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
|
|
AoIBAQC/jwYuhBVlqaiYWEMsrWFisgJ+PtM91eSrpI4TK7U53mwCIawSDHy8vUmk
|
|
5N2KAj9abvT9NP5SMS1hQi3usxoYGonXQgfO6ZXyUA9a+KAkqdFnBnlyugSeCOep
|
|
8EdZFfsaRFtMjkwz5Gcz2Py4vIYvCdMHPtwaz0bVuzneueIEz6TnQjE63Rdt2zbw
|
|
nebwTG5ZybeWSwbzy+BJ34ZHcUhPAY89yJQXuE0IzMZFcEBbPNRbWECRKgjq//qT
|
|
9nmDOFVlSRCt2wiqPSzluwn+v+suQEBsUjTGMEd25tKXXTkNW21wIWbxeSyUoTXw
|
|
LvGS6xlwQSgNpk2qXYwf8iXg7VWZAgMBAAGjQjBAMB0GA1UdDgQWBBQgIvz0bNGJ
|
|
hjgpToksyKpP9xv9oDAPBgNVHRMECDAGAQH/AgEAMA4GA1UdDwEB/wQEAwIBBjAN
|
|
BgkqhkiG9w0BAQsFAAOCAQEAjvjuOMDSa+JXFCLyBKsycXtBVZsJ4Ue3LbaEsPY4
|
|
MYN/hIQ5ZM5p7EjfcnMG4CtYkNsfNHc0AhBLdq45rnT87q/6O3vUEtNMafbhU6kt
|
|
hX7Y+9XFN9NpmYxr+ekVY5xOxi8h9JDIgoMP4VB1uS0aunL1IGqrNooL9mmFnL2k
|
|
LVVee6/VR6C5+KSTCMCWppMuJIZII2v9o4dkoZ8Y7QRjQlLfYzd3qGtKbw7xaF1U
|
|
sG/5xUb/Btwb2X2g4InpiB/yt/3CpQXpiWX/K4mBvUKiGn05ZsqeY1gx4g0xLBqc
|
|
U9psmyPzK+Vsgw2jeRQ5JlKDyqE0hebfC1tvFu0CCrJFcw==
|
|
"""
|
|
)
|
|
|
|
|
|
class YubicoAttestationVerifier(AttestationVerifier):
|
|
"""Example implementation of an AttestationVerifier.
|
|
|
|
This simple example will attempt to verify all trust paths using the Yubico CA.
|
|
A real implementation can use the information in the attestation result, or the
|
|
authenticator data, to determine which CA should be used to verify the path.
|
|
"""
|
|
|
|
def ca_lookup(self, result, auth_data):
|
|
return YUBICO_CA
|
|
|
|
|
|
uv = "discouraged"
|
|
|
|
|
|
# Handle user interaction
|
|
class CliInteraction(UserInteraction):
|
|
def prompt_up(self):
|
|
print("\nTouch your authenticator device now...\n")
|
|
|
|
def request_pin(self, permissions, rd_id):
|
|
return getpass("Enter PIN: ")
|
|
|
|
def request_uv(self, permissions, rd_id):
|
|
print("User Verification required.")
|
|
return True
|
|
|
|
|
|
if WindowsClient.is_available() and not ctypes.windll.shell32.IsUserAnAdmin():
|
|
# Use the Windows WebAuthn API if available, and we're not running as admin
|
|
client = WindowsClient("https://example.com")
|
|
else:
|
|
# Locate a device
|
|
dev = next(CtapHidDevice.list_devices(), None)
|
|
if dev is not None:
|
|
print("Use USB HID channel.")
|
|
else:
|
|
try:
|
|
from fido2.pcsc import CtapPcscDevice
|
|
|
|
dev = next(CtapPcscDevice.list_devices(), None)
|
|
print("Use NFC channel.")
|
|
except Exception as e:
|
|
print("NFC channel search error:", e)
|
|
|
|
if not dev:
|
|
print("No FIDO device found")
|
|
sys.exit(1)
|
|
|
|
# Set up a FIDO 2 client using the origin https://example.com
|
|
client = Fido2Client(dev, "https://example.com", user_interaction=CliInteraction())
|
|
|
|
# Prefer UV if supported
|
|
if client.info.options.get("uv"):
|
|
uv = "preferred"
|
|
print("Authenticator supports User Verification")
|
|
|
|
|
|
server = Fido2Server(
|
|
{"id": "example.com", "name": "Example RP"},
|
|
attestation="direct",
|
|
verify_attestation=YubicoAttestationVerifier(),
|
|
)
|
|
|
|
user = {"id": b"user_id", "name": "A. User"}
|
|
|
|
# Prepare parameters for makeCredential
|
|
create_options, state = server.register_begin(
|
|
user, user_verification=uv, authenticator_attachment="cross-platform"
|
|
)
|
|
|
|
# Create a credential
|
|
result = client.make_credential(create_options["publicKey"])
|
|
|
|
# Complete registration
|
|
auth_data = server.register_complete(
|
|
state, result.client_data, result.attestation_object
|
|
)
|
|
credentials = [auth_data.credential_data]
|
|
|
|
print("New credential created, attestation verified!")
|
|
print("Yubico device AAGUID:", auth_data.credential_data.aaguid.hex())
|