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Conformance CLI Protocol

While all Sigstore clients share some core functionality, each of them have their own unique features and idiosyncracies that make their command lines incompatible with one another. sigstore-conformance aims to test this common feature set.

As an example of incompatibilities between clients, cosign's sign subcommand is designed to sign Docker containers rather than arbitrary files (this behaviour is accessed via cosign's sign-blob subcommand). This makes sense for cosign's use case, however it does diverge from other Sigstore clients such as sigstore-python and sigstore-js.

To resolve these differences, we've established a CLI protocol for the test suite to uniformly communicate with clients under test. Since the client's CLI is unlikely to conform to this protocol, it may be necessary to write a thin wrapper that converts the options described in this document to those that the client's native CLI accepts.

Subcommands

This is the set of subcommands that the test CLI must support. Each subcommand has a provided syntax and list of descriptions for each argument.

To simplify argument parsing, all arguments are required and will always be supplied by the conformance suite in the order that they are specified in the templates below.

Sign

Signature and certificate flow

${ENTRYPOINT} sign --identity-token TOKEN --signature FILE --certificate FILE FILE
Option Description
--identity-token The OIDC identity token to use
--signature FILE The path to write the signature to
--certificate FILE The path to write the signing certificate to
FILE The artifact to sign

Bundle flow

${ENTRYPOINT} sign-bundle --bundle FILE FILE
Option Description
--identity-token The OIDC identity token to use
--bundle FILE The path to write the bundle to
FILE The artifact to sign

Verify

Signature and certificate flow

${ENTRYPOINT} verify --signature FILE --certificate FILE --certificate-identity IDENTITY --certificate-oidc-issuer URL FILE
Option Description
--signature FILE The path to the signature to verify
--certificate FILE The path to the signing certificate to verify
--certificate-identity IDENTITY The expected identity in the signing certificate's SAN extension
--certificate-oidc-issuer URL The expected OIDC issuer for the signing certificate
FILE The path to the artifact to verify

Bundle flow

${ENTRYPOINT} verify-bundle --bundle FILE --certificate-identity IDENTITY --certificate-oidc-issuer URL FILE
Option Description
--bundle FILE The path to the Sigstore bundle to verify
--certificate-identity IDENTITY The expected identity in the signing certificate's SAN extension
--certificate-oidc-issuer URL The expected OIDC issuer for the signing certificate
FILE The path to the artifact to verify