SLSA specification

SLSA is a specification for describing and incrementally improving supply chain security, established by industry consensus. It is organized into a series of levels that describe increasing security guarantees.

This is the Working Draft of what the next version of the SLSA specification might be. It defines several SLSA levels and tracks, as well as recommended attestation formats, including provenance.

Understanding SLSA

These pages provide an overview of SLSA, how it helps protect against common supply chain attacks, and common use cases. If you’re new to SLSA or supply chain security, start here.

Page	Description
What’s new	The changes brought by this Working Draft.
About SLSA	An introductory guide to SLSA
Supply chain threats	An introduction to supply chain threats
Use cases	Use cases
Guiding principles	Use cases
FAQ	Questions and more information
Future directions	Additions and changes being considered for future SLSA versions
Tracks	Provides an overview of each track and links to more specific information.

Build Track

These pages describe the build track’s security levels and requirements. If you want to achieve a particular level of the SLSA build track these are the requirements you’ll need to meet.

Page	Description
Basics	The SLSA build track is organized into a series of levels that provide increasing supply chain security guarantees. This gives you confidence that software hasn’t been tampered with and can be securely traced back to its source. This page is a descriptive overview of the SLSA build track levels, describing their intent.
Terminology	Terminology and model used by SLSA
Producing artifacts	Detailed technical requirements for producing software artifacts, intended for platform implementers
Distributing provenance	Detailed technical requirements for distributing provenance, intended for platform implementers and software distributors
Verifying artifacts	Guidance for verifying software artifacts and their SLSA provenance, intended for platform implementers and software consumers
Assessing build platforms	Guidelines for securing SLSA Build L3+ builders, intended for platform implementers

Build Environment Track

These pages describe the build environment track’s security levels and requirements. If you want to achieve a particular level of the SLSA build environment track these are the requirements you’ll need to meet.

Page	Description
Attesting build environments	Overview of SLSA’s Attested Build Environment track, intended for all audiences

Dependency Track

This pages describes the dependency track’s security levels and requirements. If you want to achieve a particular level of the SLSA dependency track these are the requirements you’ll need to meet.

Page	Description
Consuming dependencies	Overview of the Dependency track

Source Track

These pages describe the source track’s security levels and requirements. If you want to achieve a particular level of the SLSA source track these are the requirements you’ll need to meet.

Page	Description
Producing source	Overview of the Source track
Verifying source	Guidelines for verifying source provenance
Assessing source control systems	Guidelines for assessing source control system security.

Cross Track Information

These pages describe information that crosses track boundaries.

Page	Description
Threats & mitigations	Detailed information about specific supply chain attacks and how SLSA helps
Verified Properties	SLSA allows a common way to express verified properties that may not fit within a SLSA track.

Attestation formats

These pages include the concrete schemas for SLSA attestations. The Provenance and VSA formats are recommended, but not required by the specification.

Page	Description
General model	General attestation mode
Provenance	Provides a description of the concept of provenance and links to the various tracks specific definitions.
Build Provenance	Suggested build provenance format and explanation
Verification Summary	Suggested VSA format and explanation