feat(google): keyless auth via Workload Identity Federation - #346
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NewClient now branches on whether a service-account key is supplied:
- key present -> existing JWTConfigFromJSON + Subject (domain-wide delegation)
- key absent -> ADC (e.g. an AWS Lambda role federated to GCP via Workload
Identity Federation) + impersonate.CredentialsTokenSource with
Subject, so DWD still applies. Target SA is named by the
GOOGLE_IMPERSONATE_SERVICE_ACCOUNT env var.
Lets ssosync run with zero long-lived credentials where org policy forbids
service-account key creation (constraints/iam.disableServiceAccountKeyCreation).
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Superseded by #347. Re-homed onto the branch our build already pins ( |
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What
Adds a keyless authentication path to
internal/google.NewClient: when no service-account key is supplied, it uses Application Default Credentials to impersonate the target service account (google.golang.org/api/impersonate), carrying the Workspace admin inSubjectso domain-wide delegation still works.google.JWTConfigFromJSON) is unchanged — fully backward compatible.serviceAccountKeyis empty andGOOGLE_IMPERSONATE_SERVICE_ACCOUNTnames the service account to impersonate.Subjectare unchanged.Why
ssosynccurrently requires a downloaded SA key, which is a blocker underiam.disableServiceAccountKeyCreationor when running outside GCP. This enables the modern keyless pattern: e.g. an AWS Lambda federated to GCP via Workload Identity Federation, impersonating the sync SA, with no long-lived credential.Testing
go build/go vetpass. Running in production: an AWS Lambda federated to GCP via WIF, impersonating the Workspace sync service account, syncing groups into IAM Identity Center on a schedule.Closes #345.