mirror of
https://github.com/morgan9e/virtual-webauthn
synced 2026-04-14 00:04:09 +09:00
Added user confirmation on cred creation
This commit is contained in:
382
passkey.py
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382
passkey.py
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import json
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import base64
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import os
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import time
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import hashlib
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import struct
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import cbor2
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from Crypto.PublicKey import ECC
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from Crypto.Signature import DSS
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from Crypto.Hash import SHA256
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from typing import Dict, Any, Optional
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import getpass
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from fido2.hid import CtapHidDevice
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from fido2.client import Fido2Client, UserInteraction
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from fido2.webauthn import PublicKeyCredentialCreationOptions, PublicKeyCredentialDescriptor, PublicKeyCredentialRequestOptions
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from fido2.utils import websafe_encode, websafe_decode
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class PhysicalPasskey:
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def __init__(self, dummy = ""):
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devices = list(CtapHidDevice.list_devices())
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if not devices:
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raise Exception("No FIDO2 devices found.")
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self.device = devices[0]
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print(f"Using FIDO2 device: {self.device}")
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class InputDataError(Exception):
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def __init__(self, message="", error_code=None):
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self.message = f"Input data insufficient or malformed: {message}"
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self.error_code = error_code
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super().__init__(self.message)
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def get_client(self, origin):
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class MyUserInteraction(UserInteraction):
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def prompt_up(self):
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print("\nPlease touch your security key...\n")
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def request_pin(self, permissions, rp_id):
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print(f"PIN requested for {rp_id}")
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return getpass.getpass("Enter your security key's PIN: ")
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client = Fido2Client(self.device, origin, user_interaction=MyUserInteraction())
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return client
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def create(self, create_options, origin = ""):
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print("WEBAUTHN_START_REGISTER")
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options = {"publicKey": create_options}
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if not origin:
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origin = f'https://{options["publicKey"]["rp"]["id"]}'
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if not origin:
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raise self.InputDataError("origin")
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client = self.get_client(origin)
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options["publicKey"]["challenge"] = websafe_decode(options["publicKey"]["challenge"])
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options["publicKey"]["user"]["id"] = websafe_decode(options["publicKey"]["user"]["id"])
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if "excludeCredentials" in options["publicKey"]:
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for cred in options["publicKey"]["excludeCredentials"]:
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cred["id"] = websafe_decode(cred["id"])
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pk_create_options = options["publicKey"]
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challenge = pk_create_options["challenge"]
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rp = pk_create_options["rp"]
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user = pk_create_options["user"]
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pub_key_cred_params = pk_create_options["pubKeyCredParams"]
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pk_options = PublicKeyCredentialCreationOptions(rp, user, challenge, pub_key_cred_params)
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print(f"WEBAUTHN_MAKE_CREDENTIAL(RP={rp})")
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attestation = client.make_credential(pk_options)
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client_data_b64 = attestation.client_data.b64
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attestation_object = attestation.attestation_object
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credential = attestation.attestation_object.auth_data.credential_data
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if not credential:
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raise Exception()
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result = {
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"id": websafe_encode(credential.credential_id),
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"rawId": websafe_encode(credential.credential_id),
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"type": "public-key",
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"response": {
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"attestationObject": websafe_encode(attestation_object),
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"clientDataJSON": client_data_b64
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}
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}
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print(f"WEBAUTHN_ATTESTATION(ID={result['id']})")
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return result
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def get(self, get_options, origin = ""):
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print("WEBAUTHN_START_AUTHENTICATION")
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options = {"publicKey": get_options}
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if not origin:
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origin = f'https://{options["publicKey"]["rpId"]}'
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if not origin:
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raise self.InputDataError("origin")
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client = self.get_client(origin)
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options["publicKey"]["challenge"] = websafe_decode(options["publicKey"]["challenge"])
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rp_id = options["publicKey"].get("rpId", "webauthn.io")
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challenge = options["publicKey"]["challenge"]
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if "allowCredentials" in options["publicKey"]:
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for cred in options["publicKey"]["allowCredentials"]:
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cred["id"] = websafe_decode(cred["id"])
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allowed = [PublicKeyCredentialDescriptor(cred["type"], cred["id"])
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for cred in options["publicKey"]["allowCredentials"]]
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pk_options = PublicKeyCredentialRequestOptions(challenge, rp_id=rp_id, allow_credentials=allowed)
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print(f"WEBAUTHN_GET_ASSERTION(RPID={rp_id})")
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assertion_response = client.get_assertion(pk_options)
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assertion = assertion_response.get_response(0)
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if not assertion.credential_id:
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raise Exception()
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result = {
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"id": websafe_encode(assertion.credential_id),
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"rawId": websafe_encode(assertion.credential_id),
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"type": "public-key",
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"response": {
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"authenticatorData": websafe_encode(assertion.authenticator_data),
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"clientDataJSON": assertion.client_data.b64,
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"signature": websafe_encode(assertion.signature),
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"userHandle": websafe_encode(assertion.user_handle) if assertion.user_handle else None
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}
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}
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print(f"WEBAUTHN_AUTHENTICATION(ID={result['id']})")
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return result
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class VirtualPasskey:
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def __init__(self, file: str = "passkey.json"):
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self.file = file
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self.credentials = {}
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self._load_credentials()
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class InputDataError(Exception):
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def __init__(self, message="", error_code=None):
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super().__init__(f"Input data insufficient or malformed: {message}")
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class CredNotFoundError(Exception):
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def __init__(self, message="No available credential found", error_code=None):
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super().__init__(message)
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def _load_credentials(self):
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if os.path.exists(self.file):
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try:
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with open(self.file, 'r') as f:
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self.credentials = json.load(f)
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except os.FileNotExistsError:
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self.credentials = {}
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def _save_credentials(self):
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with open(self.file, 'w') as f:
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json.dump(self.credentials, f, indent=4)
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def _create_authenticator_data(self, rp_id: bytes, counter: int = 0,
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user_present: bool = True,
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user_verified: bool = True,
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credential_data: Optional[bytes] = None) -> bytes:
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rp_id_hash = hashlib.sha256(rp_id).digest()
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flags = 0
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if user_present:
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flags |= 1 << 0
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if user_verified:
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flags |= 1 << 2
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if credential_data is not None:
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flags |= 1 << 6
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counter_bytes = struct.pack(">I", counter)
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auth_data = rp_id_hash + bytes([flags]) + counter_bytes
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if credential_data is not None:
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auth_data += credential_data
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return auth_data
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def _get_public_key_cose(self, key) -> bytes:
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x = key.pointQ.x.to_bytes(32, byteorder='big')
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y = key.pointQ.y.to_bytes(32, byteorder='big')
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cose_key = {1: 2, 3: -7, -1: 1, -2: x, -3: y}
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return cbor2.dumps(cose_key)
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def _b64url(self, d):
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if isinstance(d, bytes):
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return base64.urlsafe_b64encode(d).decode('utf-8').rstrip('=')
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elif isinstance(d, str):
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return base64.urlsafe_b64decode(d + "===")
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def create(self, data: Dict[str, Any], origin: str = "") -> Dict[str, Any]:
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challenge = data.get("challenge")
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if isinstance(challenge, str):
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challenge = self._b64url(challenge)
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rp = data.get("rp", {})
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user = data.get("user", {})
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pub_key_params = data.get("pubKeyCredParams", [])
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alg = -7
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for param in pub_key_params:
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if param.get('type') == 'public-key' and param.get('alg') == -7:
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alg = -7
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break
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if not origin:
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origin = data.get("origin")
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if not origin:
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raise self.InputDataError("origin")
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rp_id = rp.get("id").encode()
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user_id = user.get("id")
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if isinstance(user_id, str):
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user_id = self._b64url(user_id)
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key = ECC.generate(curve='P-256')
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private_key = key.export_key(format='PEM')
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public_key = key.public_key().export_key(format='PEM') # noqa: F841
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credential_id = os.urandom(16)
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credential_id_b64 = self._b64url(credential_id)
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cose_pubkey = self._get_public_key_cose(key)
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cred_id_length = struct.pack(">H", len(credential_id))
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aaguid = b'\x00' * 16
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attested_data = aaguid + cred_id_length + credential_id + cose_pubkey
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auth_data = self._create_authenticator_data(rp_id, counter=0, credential_data=attested_data)
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attestation_obj = {
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"fmt": "none",
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"authData": auth_data,
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"attStmt": {}
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}
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attestation_cbor = cbor2.dumps(attestation_obj)
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client_data = {
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"challenge": self._b64url(challenge),
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"origin": origin,
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"type": "webauthn.create",
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"crossOrigin": False,
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}
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client_data_json = json.dumps(client_data).encode()
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self.credentials[credential_id_b64] = {
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"private_key": private_key,
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"rp_id": self._b64url(rp_id),
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"user_id": self._b64url(user_id),
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"user_name": user.get('displayName', ''),
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"created": int(time.time()),
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"counter": 0
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}
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self._save_credentials()
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response = {
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"authenticatorAttachment": "cross-platform",
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"id": credential_id_b64,
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"rawId": credential_id_b64,
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"response": {
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"attestationObject": self._b64url(attestation_cbor),
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"clientDataJSON": self._b64url(client_data_json),
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"publicKey": self._b64url(cose_pubkey),
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"pubKeyAlgo": str(alg),
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"transports": ["internal"]
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},
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"type": "public-key"
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}
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return response
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def get(self, data: Dict[str, Any], origin: str = "") -> Dict[str, Any]:
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challenge = data.get("challenge")
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if isinstance(challenge, str):
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challenge = self._b64url(challenge)
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allowed_credential = data.get("allowCredentials")
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for credential in allowed_credential:
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credential_id_b64 = credential["id"]
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if self.credentials.get(credential_id_b64):
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cred = self.credentials[credential_id_b64]
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break
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else:
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raise self.CredNotFoundError()
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rp_id = data.get("rpId", "").encode('utf-8')
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if not rp_id:
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raise self.InputDataError("rp_id")
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if not origin:
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origin = data.get("origin")
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if not origin:
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raise self.InputDataError("origin")
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counter = cred.get("counter", 0) + 1
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cred["counter"] = counter
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auth_data = self._create_authenticator_data(
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rp_id=rp_id,
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counter=counter,
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user_present=True,
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user_verified=True
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)
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client_data = ('{"type":"%s","challenge":"%s","origin":"%s","crossOrigin":false}'
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% ("webauthn.get", self._b64url(challenge), origin)).encode()
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client_data_hash = hashlib.sha256(client_data).digest()
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signature_data = auth_data + client_data_hash
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key = ECC.import_key(cred["private_key"])
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h = SHA256.new(signature_data)
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signer = DSS.new(key, 'fips-186-3', encoding='der')
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signature = signer.sign(h)
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self._save_credentials()
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response = {
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"authenticatorAttachment": "cross-platform",
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"id": credential_id_b64,
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"rawId": credential_id_b64,
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"response": {
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"authenticatorData": self._b64url(auth_data),
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"clientDataJSON": self._b64url(client_data),
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"signature": self._b64url(signature)
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},
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"type": "public-key"
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}
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return response
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Passkey = VirtualPasskey
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if __name__=="__main__":
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import requests
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sess = requests.Session()
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passkey = Passkey()
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payload = {
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"algorithms": ["es256"], "attachment": "all", "attestation": "none", "discoverable_credential": "preferred",
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"hints": [], "user_verification": "preferred", "username": "asdf"
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}
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resp = sess.post("https://webauthn.io/registration/options", json=payload)
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print(resp.json())
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data = passkey.create(resp.json(), origin="https://webauthn.io")
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data["rawId"] = data["id"]
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print(data)
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resp = sess.post("https://webauthn.io/registration/verification", json={"response": data, "username": "asdf"})
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print(resp.json())
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print()
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sess.get("https://webauthn.io/logout")
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payload = {"username":"asdf", "user_verification":"preferred", "hints":[]}
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resp = sess.post("https://webauthn.io/authentication/options", json=payload, headers={"origin": "https://webauthn.io"})
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print(resp.json())
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data = passkey.get(resp.json(), origin="https://webauthn.io")
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print(data)
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data["rawId"] = data["id"]
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resp = sess.post("https://webauthn.io/authentication/verification", json={"response": data, "username": "asdf"})
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print(resp.json())
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