76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
# Copyright 2016 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Convenience class for U2F signing with local security keys."""
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import six
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import base64
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import sys
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from pyu2f import errors
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from pyu2f import u2f
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from pyu2f.convenience import baseauthenticator
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class LocalAuthenticator(baseauthenticator.BaseAuthenticator):
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"""Authenticator wrapper around the native python u2f implementation."""
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def __init__(self, origin):
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self.origin = origin
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def Authenticate(self, app_id, challenge_data,
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print_callback=sys.stderr.write):
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"""See base class."""
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# If authenticator is not plugged in, prompt
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try:
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device = u2f.GetLocalU2FInterface(origin=self.origin)
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except errors.NoDeviceFoundError:
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print_callback('Please insert your security key and press enter...')
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six.moves.input()
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device = u2f.GetLocalU2FInterface(origin=self.origin)
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print_callback('Please touch your security key.\n')
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for challenge_item in challenge_data:
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raw_challenge = challenge_item['challenge']
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key = challenge_item['key']
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try:
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result = device.Authenticate(app_id, raw_challenge, [key])
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except errors.U2FError as e:
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if e.code == errors.U2FError.DEVICE_INELIGIBLE:
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continue
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else:
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raise
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client_data = self._base64encode(result.client_data.GetJson().encode())
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signature_data = self._base64encode(result.signature_data)
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key_handle = self._base64encode(result.key_handle)
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return {
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'clientData': client_data,
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'signatureData': signature_data,
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'applicationId': app_id,
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'keyHandle': key_handle,
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}
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raise errors.U2FError(errors.U2FError.DEVICE_INELIGIBLE)
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def IsAvailable(self):
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"""See base class."""
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return True
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def _base64encode(self, bytes_data):
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"""Helper method to base64 encode and return str result."""
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return base64.urlsafe_b64encode(bytes_data).decode()
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