1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
# 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 http.client as http_client
import json
from google.auth import _exponential_backoff
from google.auth import _helpers
from google.auth import credentials
from google.auth import crypt
from google.auth import exceptions
IAM_RETRY_CODES = {
http_client.INTERNAL_SERVER_ERROR,
http_client.BAD_GATEWAY,
http_client.SERVICE_UNAVAILABLE,
http_client.GATEWAY_TIMEOUT,
}
_IAM_SCOPE = ["https://www.googleapis.com/auth/iam"]
_IAM_ENDPOINT = (
"https://iamcredentials.googleapis.com/v1/projects/-"
+ "/serviceAccounts/{}:generateAccessToken"
)
_IAM_SIGN_ENDPOINT = (
"https://iamcredentials.googleapis.com/v1/projects/-"
+ "/serviceAccounts/{}:signBlob"
)
_IAM_IDTOKEN_ENDPOINT = (
"https://iamcredentials.googleapis.com/v1/"
+ "projects/-/serviceAccounts/{}:generateIdToken"
)
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 = _IAM_SIGN_ENDPOINT.replace(
credentials.DEFAULT_UNIVERSE_DOMAIN, self._credentials.universe_domain
).format(self._service_account_email)
headers = {"Content-Type": "application/json"}
body = json.dumps(
{"payload": base64.b64encode(message).decode("utf-8")}
).encode("utf-8")
retries = _exponential_backoff.ExponentialBackoff()
for _ in retries:
self._credentials.before_request(self._request, method, url, headers)
response = self._request(url=url, method=method, body=body, headers=headers)
if response.status in IAM_RETRY_CODES:
continue
if response.status != http_client.OK:
raise exceptions.TransportError(
"Error calling the IAM signBlob API: {}".format(response.data)
)
return json.loads(response.data.decode("utf-8"))
raise exceptions.TransportError("exhausted signBlob endpoint retries")
@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"])
|
