feat(auth): add universe domain support to idtoken #11059
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codyoss
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Summary
IdToken flow can be done in two ways: 1) OAuth2 server calls or 2) IAM service calls. The majority of implementations went with the OAuth2 server calls. In non-GDU environments, however, there is no OAuth2 server, so the IAM implementation must be used. This is enabled as follows:
impersonatedIDTokenProvider.Tokeninauth/credentials/impersonate/idtoken.gotoIDTokenIAMOptions.Tokeninauth/credentials/internal/impersonate/idtoken.goto enable reuse inauth/credentials/idtoken/iam.go.formatIAMServiceAccountNameinauth/credentials/impersonate/impersonate.gotoFormatIAMServiceAccountResourceinauth/internal/internal.go, for reuse.auth/credentials/idtoken/file.gointroduce a conditional (resolveUniverseDomain(f) == internal.DefaultUniverseDomain) which if true sustains the existing behavior (auth.New2LOTokenProvider) and if false introduces the new non-GDU behavior inIDTokenIAMOptions.TokenNote that to use the IAM endpoint in a non-GDU environment, the service account must have the
iam.serviceAccountTokenCreatorrole because the service account is not only the target service account, but also the caller; the Oauth2 endpoint doesn’t need this.