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📄 __init__.py # Copyright 2016 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. """Google Compute Engine authentication.""" from google.auth.compute_engine._metadata import detect_gce_residency_linux from google.auth.compute_engine.credentials import Credentials from google.auth.compute_engine.credentials import IDTokenCredentials __all__ = ["Credentials", "IDTokenCredentials", "detect_gce_residency_linux"]	910 B	2025-04-14 17:36
📄 _metadata.py # Copyright 2016 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. """Provides helper methods for talking to the Compute Engine metadata server. See https://cloud.google.com/compute/docs/metadata for more details. """ import datetime import http.client as http_client import json import logging import os from urllib.parse import urljoin from google.auth import _helpers from google.auth import environment_vars from google.auth import exceptions from google.auth import metrics from google.auth import transport from google.auth._exponential_backoff import ExponentialBackoff _LOGGER = logging.getLogger(__name__) # Environment variable GCE_METADATA_HOST is originally named # GCE_METADATA_ROOT. For compatibility reasons, here it checks # the new variable first; if not set, the system falls back # to the old variable. _GCE_METADATA_HOST = os.getenv(environment_vars.GCE_METADATA_HOST, None) if not _GCE_METADATA_HOST: _GCE_METADATA_HOST = os.getenv( environment_vars.GCE_METADATA_ROOT, "metadata.google.internal" ) _METADATA_ROOT = "http://{}/computeMetadata/v1/".format(_GCE_METADATA_HOST) # This is used to ping the metadata server, it avoids the cost of a DNS # lookup. _METADATA_IP_ROOT = "http://{}".format( os.getenv(environment_vars.GCE_METADATA_IP, "169.254.169.254") ) _METADATA_FLAVOR_HEADER = "metadata-flavor" _METADATA_FLAVOR_VALUE = "Google" _METADATA_HEADERS = {_METADATA_FLAVOR_HEADER: _METADATA_FLAVOR_VALUE} # Timeout in seconds to wait for the GCE metadata server when detecting the # GCE environment. try: _METADATA_DEFAULT_TIMEOUT = int(os.getenv("GCE_METADATA_TIMEOUT", 3)) except ValueError: # pragma: NO COVER _METADATA_DEFAULT_TIMEOUT = 3 # Detect GCE Residency _GOOGLE = "Google" _GCE_PRODUCT_NAME_FILE = "/sys/class/dmi/id/product_name" def is_on_gce(request): """Checks to see if the code runs on Google Compute Engine Args: request (google.auth.transport.Request): A callable used to make HTTP requests. Returns: bool: True if the code runs on Google Compute Engine, False otherwise. """ if ping(request): return True if os.name == "nt": # TODO: implement GCE residency detection on Windows return False # Detect GCE residency on Linux return detect_gce_residency_linux() def detect_gce_residency_linux(): """Detect Google Compute Engine residency by smbios check on Linux Returns: bool: True if the GCE product name file is detected, False otherwise. """ try: with open(_GCE_PRODUCT_NAME_FILE, "r") as file_obj: content = file_obj.read().strip() except Exception: return False return content.startswith(_GOOGLE) def ping(request, timeout=_METADATA_DEFAULT_TIMEOUT, retry_count=3): """Checks to see if the metadata server is available. Args: request (google.auth.transport.Request): A callable used to make HTTP requests. timeout (int): How long to wait for the metadata server to respond. retry_count (int): How many times to attempt connecting to metadata server using above timeout. Returns: bool: True if the metadata server is reachable, False otherwise. """ # NOTE: The explicit ``timeout`` is a workaround. The underlying # issue is that resolving an unknown host on some networks will take # 20-30 seconds; making this timeout short fixes the issue, but # could lead to false negatives in the event that we are on GCE, but # the metadata resolution was particularly slow. The latter case is # "unlikely". headers = _METADATA_HEADERS.copy() headers[metrics.API_CLIENT_HEADER] = metrics.mds_ping() backoff = ExponentialBackoff(total_attempts=retry_count) for attempt in backoff: try: response = request( url=_METADATA_IP_ROOT, method="GET", headers=headers, timeout=timeout ) metadata_flavor = response.headers.get(_METADATA_FLAVOR_HEADER) return ( response.status == http_client.OK and metadata_flavor == _METADATA_FLAVOR_VALUE ) except exceptions.TransportError as e: _LOGGER.warning( "Compute Engine Metadata server unavailable on " "attempt %s of %s. Reason: %s", attempt, retry_count, e, ) return False def get( request, path, root=_METADATA_ROOT, params=None, recursive=False, retry_count=5, headers=None, return_none_for_not_found_error=False, timeout=_METADATA_DEFAULT_TIMEOUT, ): """Fetch a resource from the metadata server. Args: request (google.auth.transport.Request): A callable used to make HTTP requests. path (str): The resource to retrieve. For example, ``'instance/service-accounts/default'``. root (str): The full path to the metadata server root. params (Optional[Mapping[str, str]]): A mapping of query parameter keys to values. recursive (bool): Whether to do a recursive query of metadata. See https://cloud.google.com/compute/docs/metadata#aggcontents for more details. retry_count (int): How many times to attempt connecting to metadata server using above timeout. headers (Optional[Mapping[str, str]]): Headers for the request. return_none_for_not_found_error (Optional[bool]): If True, returns None for 404 error instead of throwing an exception. timeout (int): How long to wait, in seconds for the metadata server to respond. Returns: Union[Mapping, str]: If the metadata server returns JSON, a mapping of the decoded JSON is returned. Otherwise, the response content is returned as a string. Raises: google.auth.exceptions.TransportError: if an error occurred while retrieving metadata. """ base_url = urljoin(root, path) query_params = {} if params is None else params headers_to_use = _METADATA_HEADERS.copy() if headers: headers_to_use.update(headers) if recursive: query_params["recursive"] = "true" url = _helpers.update_query(base_url, query_params) backoff = ExponentialBackoff(total_attempts=retry_count) failure_reason = None for attempt in backoff: try: response = request( url=url, method="GET", headers=headers_to_use, timeout=timeout ) if response.status in transport.DEFAULT_RETRYABLE_STATUS_CODES: _LOGGER.warning( "Compute Engine Metadata server unavailable on " "attempt %s of %s. Response status: %s", attempt, retry_count, response.status, ) failure_reason = ( response.data.decode("utf-8") if hasattr(response.data, "decode") else response.data ) continue else: break except exceptions.TransportError as e: _LOGGER.warning( "Compute Engine Metadata server unavailable on " "attempt %s of %s. Reason: %s", attempt, retry_count, e, ) failure_reason = e else: raise exceptions.TransportError( "Failed to retrieve {} from the Google Compute Engine " "metadata service. Compute Engine Metadata server unavailable due to {}".format( url, failure_reason ) ) content = _helpers.from_bytes(response.data) if response.status == http_client.NOT_FOUND and return_none_for_not_found_error: return None if response.status == http_client.OK: if ( _helpers.parse_content_type(response.headers["content-type"]) == "application/json" ): try: return json.loads(content) except ValueError as caught_exc: new_exc = exceptions.TransportError( "Received invalid JSON from the Google Compute Engine " "metadata service: {:.20}".format(content) ) raise new_exc from caught_exc else: return content raise exceptions.TransportError( "Failed to retrieve {} from the Google Compute Engine " "metadata service. Status: {} Response:\n{}".format( url, response.status, response.data ), response, ) def get_project_id(request): """Get the Google Cloud Project ID from the metadata server. Args: request (google.auth.transport.Request): A callable used to make HTTP requests. Returns: str: The project ID Raises: google.auth.exceptions.TransportError: if an error occurred while retrieving metadata. """ return get(request, "project/project-id") def get_universe_domain(request): """Get the universe domain value from the metadata server. Args: request (google.auth.transport.Request): A callable used to make HTTP requests. Returns: str: The universe domain value. If the universe domain endpoint is not not found, return the default value, which is googleapis.com Raises: google.auth.exceptions.TransportError: if an error other than 404 occurs while retrieving metadata. """ universe_domain = get( request, "universe/universe-domain", return_none_for_not_found_error=True ) if not universe_domain: return "googleapis.com" return universe_domain def get_service_account_info(request, service_account="default"): """Get information about a service account from the metadata server. Args: request (google.auth.transport.Request): A callable used to make HTTP requests. service_account (str): The string 'default' or a service account email address. The determines which service account for which to acquire information. Returns: Mapping: The service account's information, for example:: { 'email': '...', 'scopes': ['scope', ...], 'aliases': ['default', '...'] } Raises: google.auth.exceptions.TransportError: if an error occurred while retrieving metadata. """ path = "instance/service-accounts/{0}/".format(service_account) # See https://cloud.google.com/compute/docs/metadata#aggcontents # for more on the use of 'recursive'. return get(request, path, params={"recursive": "true"}) def get_service_account_token(request, service_account="default", scopes=None): """Get the OAuth 2.0 access token for a service account. Args: request (google.auth.transport.Request): A callable used to make HTTP requests. service_account (str): The string 'default' or a service account email address. The determines which service account for which to acquire an access token. scopes (Optional[Union[str, List[str]]]): Optional string or list of strings with auth scopes. Returns: Tuple[str, datetime]: The access token and its expiration. Raises: google.auth.exceptions.TransportError: if an error occurred while retrieving metadata. """ if scopes: if not isinstance(scopes, str): scopes = ",".join(scopes) params = {"scopes": scopes} else: params = None metrics_header = { metrics.API_CLIENT_HEADER: metrics.token_request_access_token_mds() } path = "instance/service-accounts/{0}/token".format(service_account) token_json = get(request, path, params=params, headers=metrics_header) token_expiry = _helpers.utcnow() + datetime.timedelta( seconds=token_json["expires_in"] ) return token_json["access_token"], token_expiry	12.56 KB	2025-04-14 17:36
📄 credentials.py # Copyright 2016 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. """Google Compute Engine credentials. This module provides authentication for an application running on Google Compute Engine using the Compute Engine metadata server. """ import datetime from google.auth import _helpers from google.auth import credentials from google.auth import exceptions from google.auth import iam from google.auth import jwt from google.auth import metrics from google.auth.compute_engine import _metadata from google.oauth2 import _client class Credentials( credentials.Scoped, credentials.CredentialsWithQuotaProject, credentials.CredentialsWithUniverseDomain, ): """Compute Engine Credentials. These credentials use the Google Compute Engine metadata server to obtain OAuth 2.0 access tokens associated with the instance's service account, and are also used for Cloud Run, Flex and App Engine (except for the Python 2.7 runtime, which is supported only on older versions of this library). For more information about Compute Engine authentication, including how to configure scopes, see the `Compute Engine authentication documentation`_. .. note:: On Compute Engine the metadata server ignores requested scopes. On Cloud Run, Flex and App Engine the server honours requested scopes. .. _Compute Engine authentication documentation: https://cloud.google.com/compute/docs/authentication#using """ def __init__( self, service_account_email="default", quota_project_id=None, scopes=None, default_scopes=None, universe_domain=None, ): """ Args: service_account_email (str): The service account email to use, or 'default'. A Compute Engine instance may have multiple service accounts. quota_project_id (Optional[str]): The project ID used for quota and billing. scopes (Optional[Sequence[str]]): The list of scopes for the credentials. default_scopes (Optional[Sequence[str]]): Default scopes passed by a Google client library. Use 'scopes' for user-defined scopes. universe_domain (Optional[str]): The universe domain. If not provided or None, credential will attempt to fetch the value from metadata server. If metadata server doesn't have universe domain endpoint, then the default googleapis.com will be used. """ super(Credentials, self).__init__() self._service_account_email = service_account_email self._quota_project_id = quota_project_id self._scopes = scopes self._default_scopes = default_scopes self._universe_domain_cached = False if universe_domain: self._universe_domain = universe_domain self._universe_domain_cached = True def _retrieve_info(self, request): """Retrieve information about the service account. Updates the scopes and retrieves the full service account email. Args: request (google.auth.transport.Request): The object used to make HTTP requests. """ info = _metadata.get_service_account_info( request, service_account=self._service_account_email ) self._service_account_email = info["email"] # Don't override scopes requested by the user. if self._scopes is None: self._scopes = info["scopes"] def _metric_header_for_usage(self): return metrics.CRED_TYPE_SA_MDS def refresh(self, request): """Refresh the access token and scopes. Args: request (google.auth.transport.Request): The object used to make HTTP requests. Raises: google.auth.exceptions.RefreshError: If the Compute Engine metadata service can't be reached if if the instance has not credentials. """ scopes = self._scopes if self._scopes is not None else self._default_scopes try: self._retrieve_info(request) self.token, self.expiry = _metadata.get_service_account_token( request, service_account=self._service_account_email, scopes=scopes ) except exceptions.TransportError as caught_exc: new_exc = exceptions.RefreshError(caught_exc) raise new_exc from caught_exc @property def service_account_email(self): """The service account email. .. note:: This is not guaranteed to be set until :meth:`refresh` has been called. """ return self._service_account_email @property def requires_scopes(self): return not self._scopes @property def universe_domain(self): if self._universe_domain_cached: return self._universe_domain from google.auth.transport import requests as google_auth_requests self._universe_domain = _metadata.get_universe_domain( google_auth_requests.Request() ) self._universe_domain_cached = True return self._universe_domain @_helpers.copy_docstring(credentials.Credentials) def get_cred_info(self): return { "credential_source": "metadata server", "credential_type": "VM credentials", "principal": self.service_account_email, } @_helpers.copy_docstring(credentials.CredentialsWithQuotaProject) def with_quota_project(self, quota_project_id): creds = self.__class__( service_account_email=self._service_account_email, quota_project_id=quota_project_id, scopes=self._scopes, default_scopes=self._default_scopes, ) creds._universe_domain = self._universe_domain creds._universe_domain_cached = self._universe_domain_cached return creds @_helpers.copy_docstring(credentials.Scoped) def with_scopes(self, scopes, default_scopes=None): # Compute Engine credentials can not be scoped (the metadata service # ignores the scopes parameter). App Engine, Cloud Run and Flex support # requesting scopes. creds = self.__class__( scopes=scopes, default_scopes=default_scopes, service_account_email=self._service_account_email, quota_project_id=self._quota_project_id, ) creds._universe_domain = self._universe_domain creds._universe_domain_cached = self._universe_domain_cached return creds @_helpers.copy_docstring(credentials.CredentialsWithUniverseDomain) def with_universe_domain(self, universe_domain): return self.__class__( scopes=self._scopes, default_scopes=self._default_scopes, service_account_email=self._service_account_email, quota_project_id=self._quota_project_id, universe_domain=universe_domain, ) _DEFAULT_TOKEN_LIFETIME_SECS = 3600 # 1 hour in seconds _DEFAULT_TOKEN_URI = "https://www.googleapis.com/oauth2/v4/token" class IDTokenCredentials( credentials.CredentialsWithQuotaProject, credentials.Signing, credentials.CredentialsWithTokenUri, ): """Open ID Connect ID Token-based service account credentials. These credentials relies on the default service account of a GCE instance. ID token can be requested from `GCE metadata server identity endpoint`_, IAM token endpoint or other token endpoints you specify. If metadata server identity endpoint is not used, the GCE instance must have been started with a service account that has access to the IAM Cloud API. .. _GCE metadata server identity endpoint: https://cloud.google.com/compute/docs/instances/verifying-instance-identity """ def __init__( self, request, target_audience, token_uri=None, additional_claims=None, service_account_email=None, signer=None, use_metadata_identity_endpoint=False, quota_project_id=None, ): """ Args: request (google.auth.transport.Request): The object used to make HTTP requests. target_audience (str): The intended audience for these credentials, used when requesting the ID Token. The ID Token's ``aud`` claim will be set to this string. token_uri (str): The OAuth 2.0 Token URI. additional_claims (Mapping[str, str]): Any additional claims for the JWT assertion used in the authorization grant. service_account_email (str): Optional explicit service account to use to sign JWT tokens. By default, this is the default GCE service account. signer (google.auth.crypt.Signer): The signer used to sign JWTs. In case the signer is specified, the request argument will be ignored. use_metadata_identity_endpoint (bool): Whether to use GCE metadata identity endpoint. For backward compatibility the default value is False. If set to True, ``token_uri``, ``additional_claims``, ``service_account_email``, ``signer`` argument should not be set; otherwise ValueError will be raised. quota_project_id (Optional[str]): The project ID used for quota and billing. Raises: ValueError: If ``use_metadata_identity_endpoint`` is set to True, and one of ``token_uri``, ``additional_claims``, ``service_account_email``, ``signer`` arguments is set. """ super(IDTokenCredentials, self).__init__() self._quota_project_id = quota_project_id self._use_metadata_identity_endpoint = use_metadata_identity_endpoint self._target_audience = target_audience if use_metadata_identity_endpoint: if token_uri or additional_claims or service_account_email or signer: raise exceptions.MalformedError( "If use_metadata_identity_endpoint is set, token_uri, " "additional_claims, service_account_email, signer arguments" " must not be set" ) self._token_uri = None self._additional_claims = None self._signer = None if service_account_email is None: sa_info = _metadata.get_service_account_info(request) self._service_account_email = sa_info["email"] else: self._service_account_email = service_account_email if not use_metadata_identity_endpoint: if signer is None: signer = iam.Signer( request=request, credentials=Credentials(), service_account_email=self._service_account_email, ) self._signer = signer self._token_uri = token_uri or _DEFAULT_TOKEN_URI if additional_claims is not None: self._additional_claims = additional_claims else: self._additional_claims = {} def with_target_audience(self, target_audience): """Create a copy of these credentials with the specified target audience. Args: target_audience (str): The intended audience for these credentials, used when requesting the ID Token. Returns: google.auth.service_account.IDTokenCredentials: A new credentials instance. """ # since the signer is already instantiated, # the request is not needed if self._use_metadata_identity_endpoint: return self.__class__( None, target_audience=target_audience, use_metadata_identity_endpoint=True, quota_project_id=self._quota_project_id, ) else: return self.__class__( None, service_account_email=self._service_account_email, token_uri=self._token_uri, target_audience=target_audience, additional_claims=self._additional_claims.copy(), signer=self.signer, use_metadata_identity_endpoint=False, quota_project_id=self._quota_project_id, ) @_helpers.copy_docstring(credentials.CredentialsWithQuotaProject) def with_quota_project(self, quota_project_id): # since the signer is already instantiated, # the request is not needed if self._use_metadata_identity_endpoint: return self.__class__( None, target_audience=self._target_audience, use_metadata_identity_endpoint=True, quota_project_id=quota_project_id, ) else: return self.__class__( None, service_account_email=self._service_account_email, token_uri=self._token_uri, target_audience=self._target_audience, additional_claims=self._additional_claims.copy(), signer=self.signer, use_metadata_identity_endpoint=False, quota_project_id=quota_project_id, ) @_helpers.copy_docstring(credentials.CredentialsWithTokenUri) def with_token_uri(self, token_uri): # since the signer is already instantiated, # the request is not needed if self._use_metadata_identity_endpoint: raise exceptions.MalformedError( "If use_metadata_identity_endpoint is set, token_uri" " must not be set" ) else: return self.__class__( None, service_account_email=self._service_account_email, token_uri=token_uri, target_audience=self._target_audience, additional_claims=self._additional_claims.copy(), signer=self.signer, use_metadata_identity_endpoint=False, quota_project_id=self.quota_project_id, ) def _make_authorization_grant_assertion(self): """Create the OAuth 2.0 assertion. This assertion is used during the OAuth 2.0 grant to acquire an ID token. Returns: bytes: The authorization grant assertion. """ now = _helpers.utcnow() lifetime = datetime.timedelta(seconds=_DEFAULT_TOKEN_LIFETIME_SECS) expiry = now + lifetime payload = { "iat": _helpers.datetime_to_secs(now), "exp": _helpers.datetime_to_secs(expiry), # The issuer must be the service account email. "iss": self.service_account_email, # The audience must be the auth token endpoint's URI "aud": self._token_uri, # The target audience specifies which service the ID token is # intended for. "target_audience": self._target_audience, } payload.update(self._additional_claims) token = jwt.encode(self._signer, payload) return token def _call_metadata_identity_endpoint(self, request): """Request ID token from metadata identity endpoint. Args: request (google.auth.transport.Request): The object used to make HTTP requests. Returns: Tuple[str, datetime.datetime]: The ID token and the expiry of the ID token. Raises: google.auth.exceptions.RefreshError: If the Compute Engine metadata service can't be reached or if the instance has no credentials. ValueError: If extracting expiry from the obtained ID token fails. """ try: path = "instance/service-accounts/default/identity" params = {"audience": self._target_audience, "format": "full"} metrics_header = { metrics.API_CLIENT_HEADER: metrics.token_request_id_token_mds() } id_token = _metadata.get( request, path, params=params, headers=metrics_header ) except exceptions.TransportError as caught_exc: new_exc = exceptions.RefreshError(caught_exc) raise new_exc from caught_exc _, payload, _, _ = jwt._unverified_decode(id_token) return id_token, datetime.datetime.utcfromtimestamp(payload["exp"]) def refresh(self, request): """Refreshes the ID token. Args: request (google.auth.transport.Request): The object used to make HTTP requests. Raises: google.auth.exceptions.RefreshError: If the credentials could not be refreshed. ValueError: If extracting expiry from the obtained ID token fails. """ if self._use_metadata_identity_endpoint: self.token, self.expiry = self._call_metadata_identity_endpoint(request) else: assertion = self._make_authorization_grant_assertion() access_token, expiry, _ = _client.id_token_jwt_grant( request, self._token_uri, assertion ) self.token = access_token self.expiry = expiry @property # type: ignore @_helpers.copy_docstring(credentials.Signing) def signer(self): return self._signer def sign_bytes(self, message): """Signs the given message. Args: message (bytes): The message to sign. Returns: bytes: The message's cryptographic signature. Raises: ValueError: Signer is not available if metadata identity endpoint is used. """ if self._use_metadata_identity_endpoint: raise exceptions.InvalidOperation( "Signer is not available if metadata identity endpoint is used" ) return self._signer.sign(message) @property def service_account_email(self): """The service account email.""" return self._service_account_email @property def signer_email(self): return self._service_account_email	18.58 KB	2025-04-14 17:36

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