How to Add Enterprise SSO to Your CLI Tool: A SAML and OIDC Implementation Guide

Enterprise single sign-on (SSO) for command-line interface (CLI) tools involves using OAuth 2.0 to delegate user authentication to a browser-based identity provider, ensuring security and compliance with growing enterprise demands. The OAuth 2.0 Device Authorization Grant and localhost loopback methods are recommended for CLI authentication, enabling secure token exchange and storage in the operating system's keychain. This approach prevents the direct embedding of SAML, which is not secure in a CLI environment due to its browser-based nature. Proper implementation involves token rotation and refresh mechanisms to mitigate security breaches, supported by robust error handling and adherence to best practices. The architecture separates OAuth on the CLI from SAML or OIDC on the server, making the process secure and manageable, with mature libraries available for implementation.