101 lines
3.6 KiB
Python
101 lines
3.6 KiB
Python
|
# Copyright 2017 Google LLC
|
||
|
|
#
|
||
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
# you may not use this file except in compliance with the License.
|
||
|
|
# You may obtain a copy of the License at
|
||
|
|
#
|
||
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
#
|
||
|
|
# Unless required by applicable law or agreed to in writing, software
|
||
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
# See the License for the specific language governing permissions and
|
||
|
|
# limitations under the License.
|
||
|
|
|
||
|
|
"""Tools for using the Google `Cloud Identity and Access Management (IAM)
|
||
|
|
API`_'s auth-related functionality.
|
||
|
|
|
||
|
|
.. _Cloud Identity and Access Management (IAM) API:
|
||
|
|
https://cloud.google.com/iam/docs/
|
||
|
|
"""
|
||
|
|
|
||
|
|
import base64
|
||
|
|
import json
|
||
|
|
|
||
|
|
from six.moves import http_client
|
||
|
|
|
||
|
|
from google.auth import _helpers
|
||
|
|
from google.auth import crypt
|
||
|
|
from google.auth import exceptions
|
||
|
|
|
||
|
|
_IAM_API_ROOT_URI = "https://iamcredentials.googleapis.com/v1"
|
||
|
|
_SIGN_BLOB_URI = _IAM_API_ROOT_URI + "/projects/-/serviceAccounts/{}:signBlob?alt=json"
|
||
|
|
|
||
|
|
|
||
|
|
class Signer(crypt.Signer):
|
||
|
|
"""Signs messages using the IAM `signBlob API`_.
|
||
|
|
|
||
|
|
This is useful when you need to sign bytes but do not have access to the
|
||
|
|
credential's private key file.
|
||
|
|
|
||
|
|
.. _signBlob API:
|
||
|
|
https://cloud.google.com/iam/reference/rest/v1/projects.serviceAccounts
|
||
|
|
/signBlob
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, request, credentials, service_account_email):
|
||
|
|
"""
|
||
|
|
Args:
|
||
|
|
request (google.auth.transport.Request): The object used to make
|
||
|
|
HTTP requests.
|
||
|
|
credentials (google.auth.credentials.Credentials): The credentials
|
||
|
|
that will be used to authenticate the request to the IAM API.
|
||
|
|
The credentials must have of one the following scopes:
|
||
|
|
|
||
|
|
- https://www.googleapis.com/auth/iam
|
||
|
|
- https://www.googleapis.com/auth/cloud-platform
|
||
|
|
service_account_email (str): The service account email identifying
|
||
|
|
which service account to use to sign bytes. Often, this can
|
||
|
|
be the same as the service account email in the given
|
||
|
|
credentials.
|
||
|
|
"""
|
||
|
|
self._request = request
|
||
|
|
self._credentials = credentials
|
||
|
|
self._service_account_email = service_account_email
|
||
|
|
|
||
|
|
def _make_signing_request(self, message):
|
||
|
|
"""Makes a request to the API signBlob API."""
|
||
|
|
message = _helpers.to_bytes(message)
|
||
|
|
|
||
|
|
method = "POST"
|
||
|
|
url = _SIGN_BLOB_URI.format(self._service_account_email)
|
||
|
|
headers = {"Content-Type": "application/json"}
|
||
|
|
body = json.dumps(
|
||
|
|
{"payload": base64.b64encode(message).decode("utf-8")}
|
||
|
|
).encode("utf-8")
|
||
|
|
|
||
|
|
self._credentials.before_request(self._request, method, url, headers)
|
||
|
|
response = self._request(url=url, method=method, body=body, headers=headers)
|
||
|
|
|
||
|
|
if response.status != http_client.OK:
|
||
|
|
raise exceptions.TransportError(
|
||
|
|
"Error calling the IAM signBytes API: {}".format(response.data)
|
||
|
|
)
|
||
|
|
|
||
|
|
return json.loads(response.data.decode("utf-8"))
|
||
|
|
|
||
|
|
@property
|
||
|
|
def key_id(self):
|
||
|
|
"""Optional[str]: The key ID used to identify this private key.
|
||
|
|
|
||
|
|
.. warning::
|
||
|
|
This is always ``None``. The key ID used by IAM can not
|
||
|
|
be reliably determined ahead of time.
|
||
|
|
"""
|
||
|
|
return None
|
||
|
|
|
||
|
|
@_helpers.copy_docstring(crypt.Signer)
|
||
|
|
def sign(self, message):
|
||
|
|
response = self._make_signing_request(message)
|
||
|
|
return base64.b64decode(response["signedBlob"])
|