How we built Render OIDC

Render’s OIDC integration lets services authenticate with providers such as AWS, GCP, OpenAI, and Anthropic without long-lived API keys, using cryptographically signed tokens configured largely through environment variables. Tokens include expiration, subject, issuer, and audience claims: they last 60 minutes to limit exposure, identify specific services and workspaces for access policies, isolate trust between Render workspaces even when provider policies are misconfigured, and prevent tokens intended for one provider from being reused with another. Because common provider SDKs generally expect OIDC tokens in files rather than fetching them dynamically, Render built an OIDC Daemon that runs outside each service container and writes frequently refreshed tokens into a shared, read-only in-memory filesystem mounted into the container. This approach supports custom images, limits the daemon’s filesystem access, avoids persisting credentials to disk, and automatically configures provider-specific SDK settings, aiming to make secure short-lived authentication as simple for users as selecting a provider.

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