mirror of
https://github.com/rocky-linux/peridot.git
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263 lines
8.9 KiB
Go
263 lines
8.9 KiB
Go
// Copyright 2023 Google LLC
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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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package credentials
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"os"
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"time"
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"cloud.google.com/go/auth"
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"cloud.google.com/go/auth/internal"
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"cloud.google.com/go/auth/internal/credsfile"
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"cloud.google.com/go/compute/metadata"
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)
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const (
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// jwtTokenURL is Google's OAuth 2.0 token URL to use with the JWT(2LO) flow.
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jwtTokenURL = "https://oauth2.googleapis.com/token"
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// Google's OAuth 2.0 default endpoints.
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googleAuthURL = "https://accounts.google.com/o/oauth2/auth"
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googleTokenURL = "https://oauth2.googleapis.com/token"
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// GoogleMTLSTokenURL is Google's default OAuth2.0 mTLS endpoint.
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GoogleMTLSTokenURL = "https://oauth2.mtls.googleapis.com/token"
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// Help on default credentials
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adcSetupURL = "https://cloud.google.com/docs/authentication/external/set-up-adc"
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)
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var (
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// for testing
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allowOnGCECheck = true
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)
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// OnGCE reports whether this process is running in Google Cloud.
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func OnGCE() bool {
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// TODO(codyoss): once all libs use this auth lib move metadata check here
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return allowOnGCECheck && metadata.OnGCE()
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}
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// DetectDefault searches for "Application Default Credentials" and returns
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// a credential based on the [DetectOptions] provided.
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//
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// It looks for credentials in the following places, preferring the first
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// location found:
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//
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// - A JSON file whose path is specified by the GOOGLE_APPLICATION_CREDENTIALS
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// environment variable. For workload identity federation, refer to
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// https://cloud.google.com/iam/docs/how-to#using-workload-identity-federation
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// on how to generate the JSON configuration file for on-prem/non-Google
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// cloud platforms.
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// - A JSON file in a location known to the gcloud command-line tool. On
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// Windows, this is %APPDATA%/gcloud/application_default_credentials.json. On
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// other systems, $HOME/.config/gcloud/application_default_credentials.json.
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// - On Google Compute Engine, Google App Engine standard second generation
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// runtimes, and Google App Engine flexible environment, it fetches
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// credentials from the metadata server.
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func DetectDefault(opts *DetectOptions) (*auth.Credentials, error) {
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if err := opts.validate(); err != nil {
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return nil, err
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}
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if len(opts.CredentialsJSON) > 0 {
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return readCredentialsFileJSON(opts.CredentialsJSON, opts)
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}
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if opts.CredentialsFile != "" {
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return readCredentialsFile(opts.CredentialsFile, opts)
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}
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if filename := os.Getenv(credsfile.GoogleAppCredsEnvVar); filename != "" {
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creds, err := readCredentialsFile(filename, opts)
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if err != nil {
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return nil, err
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}
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return creds, nil
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}
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fileName := credsfile.GetWellKnownFileName()
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if b, err := os.ReadFile(fileName); err == nil {
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return readCredentialsFileJSON(b, opts)
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}
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if OnGCE() {
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return auth.NewCredentials(&auth.CredentialsOptions{
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TokenProvider: computeTokenProvider(opts),
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ProjectIDProvider: auth.CredentialsPropertyFunc(func(context.Context) (string, error) {
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return metadata.ProjectID()
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}),
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UniverseDomainProvider: &internal.ComputeUniverseDomainProvider{},
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}), nil
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}
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return nil, fmt.Errorf("credentials: could not find default credentials. See %v for more information", adcSetupURL)
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}
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// DetectOptions provides configuration for [DetectDefault].
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type DetectOptions struct {
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// Scopes that credentials tokens should have. Example:
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// https://www.googleapis.com/auth/cloud-platform. Required if Audience is
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// not provided.
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Scopes []string
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// Audience that credentials tokens should have. Only applicable for 2LO
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// flows with service accounts. If specified, scopes should not be provided.
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Audience string
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// Subject is the user email used for [domain wide delegation](https://developers.google.com/identity/protocols/oauth2/service-account#delegatingauthority).
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// Optional.
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Subject string
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// EarlyTokenRefresh configures how early before a token expires that it
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// should be refreshed. Once the token’s time until expiration has entered
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// this refresh window the token is considered valid but stale. If unset,
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// the default value is 3 minutes and 45 seconds. Optional.
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EarlyTokenRefresh time.Duration
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// DisableAsyncRefresh configures a synchronous workflow that refreshes
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// stale tokens while blocking. The default is false. Optional.
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DisableAsyncRefresh bool
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// AuthHandlerOptions configures an authorization handler and other options
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// for 3LO flows. It is required, and only used, for client credential
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// flows.
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AuthHandlerOptions *auth.AuthorizationHandlerOptions
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// TokenURL allows to set the token endpoint for user credential flows. If
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// unset the default value is: https://oauth2.googleapis.com/token.
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// Optional.
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TokenURL string
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// STSAudience is the audience sent to when retrieving an STS token.
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// Currently this only used for GDCH auth flow, for which it is required.
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STSAudience string
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// CredentialsFile overrides detection logic and sources a credential file
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// from the provided filepath. If provided, CredentialsJSON must not be.
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// Optional.
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CredentialsFile string
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// CredentialsJSON overrides detection logic and uses the JSON bytes as the
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// source for the credential. If provided, CredentialsFile must not be.
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// Optional.
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CredentialsJSON []byte
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// UseSelfSignedJWT directs service account based credentials to create a
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// self-signed JWT with the private key found in the file, skipping any
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// network requests that would normally be made. Optional.
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UseSelfSignedJWT bool
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// Client configures the underlying client used to make network requests
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// when fetching tokens. Optional.
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Client *http.Client
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// UniverseDomain is the default service domain for a given Cloud universe.
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// The default value is "googleapis.com". This option is ignored for
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// authentication flows that do not support universe domain. Optional.
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UniverseDomain string
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}
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func (o *DetectOptions) validate() error {
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if o == nil {
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return errors.New("credentials: options must be provided")
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}
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if len(o.Scopes) > 0 && o.Audience != "" {
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return errors.New("credentials: both scopes and audience were provided")
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}
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if len(o.CredentialsJSON) > 0 && o.CredentialsFile != "" {
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return errors.New("credentials: both credentials file and JSON were provided")
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}
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return nil
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}
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func (o *DetectOptions) tokenURL() string {
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if o.TokenURL != "" {
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return o.TokenURL
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}
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return googleTokenURL
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}
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func (o *DetectOptions) scopes() []string {
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scopes := make([]string, len(o.Scopes))
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copy(scopes, o.Scopes)
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return scopes
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}
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func (o *DetectOptions) client() *http.Client {
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if o.Client != nil {
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return o.Client
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}
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return internal.CloneDefaultClient()
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}
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func readCredentialsFile(filename string, opts *DetectOptions) (*auth.Credentials, error) {
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b, err := os.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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return readCredentialsFileJSON(b, opts)
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}
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func readCredentialsFileJSON(b []byte, opts *DetectOptions) (*auth.Credentials, error) {
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// attempt to parse jsonData as a Google Developers Console client_credentials.json.
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config := clientCredConfigFromJSON(b, opts)
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if config != nil {
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if config.AuthHandlerOpts == nil {
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return nil, errors.New("credentials: auth handler must be specified for this credential filetype")
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}
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tp, err := auth.New3LOTokenProvider(config)
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if err != nil {
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return nil, err
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}
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return auth.NewCredentials(&auth.CredentialsOptions{
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TokenProvider: tp,
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JSON: b,
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}), nil
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}
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return fileCredentials(b, opts)
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}
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func clientCredConfigFromJSON(b []byte, opts *DetectOptions) *auth.Options3LO {
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var creds credsfile.ClientCredentialsFile
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var c *credsfile.Config3LO
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if err := json.Unmarshal(b, &creds); err != nil {
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return nil
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}
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switch {
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case creds.Web != nil:
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c = creds.Web
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case creds.Installed != nil:
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c = creds.Installed
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default:
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return nil
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}
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if len(c.RedirectURIs) < 1 {
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return nil
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}
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var handleOpts *auth.AuthorizationHandlerOptions
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if opts.AuthHandlerOptions != nil {
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handleOpts = &auth.AuthorizationHandlerOptions{
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Handler: opts.AuthHandlerOptions.Handler,
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State: opts.AuthHandlerOptions.State,
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PKCEOpts: opts.AuthHandlerOptions.PKCEOpts,
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}
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}
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return &auth.Options3LO{
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ClientID: c.ClientID,
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ClientSecret: c.ClientSecret,
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RedirectURL: c.RedirectURIs[0],
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Scopes: opts.scopes(),
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AuthURL: c.AuthURI,
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TokenURL: c.TokenURI,
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Client: opts.client(),
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EarlyTokenExpiry: opts.EarlyTokenRefresh,
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AuthHandlerOpts: handleOpts,
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// TODO(codyoss): refactor this out. We need to add in auto-detection
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// for this use case.
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AuthStyle: auth.StyleInParams,
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}
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}
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