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Attestation

Hoppr uses in-toto to provide traceability and attestation capability.

in-toto Layout Overview​

The first step is to define the supply chain layout, a JSON-formatted file containing the steps that will be carried out in order to create the final product. In this case, the generated hoppr bundle is the final product. The layout file must be created by a project owner and signed with the project owner key.

Each step in the layout defines rules for what may and may not be included in the final hoppr bundle and must be signed by a functionary, the individual or automated process that will perform that step. An additional functionary key must be supplied in order to sign each step in the layout. The outputs expected to be produced by each step (products) are expected as inputs (materials) to each subsequent step. For the purposes of creating a hoppr bundle, the steps would be defined as:

  • _collect_metadata - Capture metadata about the conditions under which the bundle was generated. This metadata includes:
    • Manifest, transfer, and/or credentials files provided to hoppr
    • Metadata about the runtime environment (generic/_metadata_/_run_data_)
    • All input SBOMs consolidated into single SBOM file (generic/_metadata_/_consolidated_bom.json)
  • One step for each stage defined in the hoppr transfer file (e.g. Delta, Collect, Bundle)
  • _finalize - Write the final SBOM file (generic/_metadata_/_delivered_bom.json) containing the additional metadata/properties for each component added by hoppr

Once generated, verification can be performed on the hoppr bundle.

See this link for a full list of the terminology used by in-toto.

Usage​

Generate project owner key​

Create a key pair that will be used to sign the generated software supply chain layout.

in-toto-keygen project_owner_key

Generate functionary key​

Create a functionary key pair that will be used to sign the individual steps defined in the layout.

in-toto-keygen functionary_key

Generate in-toto layout​

Provide the project owner key, functionary key, and hoppr transfer file to the hopctl generate layout subcommand in order to automatically generate an in-toto layout file (named in-toto.layout).

hopctl generate layout --transfer transfer.yml --project-owner-key project_owner_key --functionary-key functionary_key

Create hoppr bundle​

Run the hopctl bundle subcommand as usual, ensuring to additionally specify the --attest and --functionary-key options.

hopctl bundle --transfer transfer.yml --log hoppr_log.txt --verbose --attest --functionary-key functionary_key manifest.yml

Verify bundle against in-toto layout​

in-toto-verify --layout in-toto.layout --layout-keys project_owner_key.pub --verbose