Commit 1bd6795a authored by Mark Lodato's avatar Mark Lodato
Browse files

Merge slsa-controls into this repository.

Each repo is small enough that it didn't make sense to have them
stand-alone.

git-subtree-dir: controls
git-subtree-mainline: b0b5339e
git-subtree-split: 9f8fe446
parents b0b5339e 9f8fe446
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# SLSA: Technical Controls
This repository contains an index of technical controls that fit into the
[SLSA Framework](https://github.com/SLSA-Framework/levels).
NOTE: This is still a work in progress.
## Contents
* [Software Attestations](attestations.md): How to represent software artifact
metadata.
* [Policies](policy.md): Conventions for how to express security policies
based on attestations.
* [Survey](survey.md): Survey of existing and in-development controls that
relate to the framework.
## Project Goals
(1) Build an ecosystem around software attestations and policies, applicable to
use cases beyond SLSA and supply chain integrity:
* Establish clear and consistent terminology and data models.
* Define simple interfaces between layers/components, to allow
compatibility between implementations and to encourage discrete,
composable technologies.
* Recommend a cohesive suite of formats, conventions, and tools that are
known to work well together.
Currently, there are various projects in this space with overlapping missions
and incompatible interfaces. No one project solves all problems and it is
confusing to understand how the pieces fit together. Our goal is to define a
"well-lit path" to make it easier for users to achieve the guarantees they
desire.
(2) Provide recipes for achieving SLSA, built on the ecosystem above:
* Identify base technologies that meet the SLSA requirements, which serves as
guidance to system implementers on how to build SLSA-compl8iant services.
Example: "CI/CD systems should produce provenance attestations in format X."
* Recommend simple end-to-end solutions for end users (software developers) to
achieve SLSA. Example: "Configure GitHub this way to reach SLSA 3."
# Software Attestations
Author: lodato@google.com \
Date: March 2021 \
Status: IN REVIEW
## Objective
Standardize the terminology, data model, layers, and conventions for software
artifact metadata.
## Overview
A software attestation is a signed statement (metadata) about a software
artifact or collection of software artifacts. (Sometimes called a
"[software bill of materials](https://en.wikipedia.org/wiki/Software_bill_of_materials)"
or SBoM. Not to be confused with
[remote attestation](https://en.wikipedia.org/wiki/Trusted_Computing#Remote_attestation)
in the trusted computing world.)
An attestation is the generalization of raw artifact/code signing, where the
signature is directly over the artifact or a hash of artifact:
* With raw signing, a signature *implies* a single bit of metadata about the
artifact, based on the public key. The exact meaning must be negotiated
between signer and verifier, and a new keyset must be provisioned for each
bit of information. For example, a signature might denote who produced an
artifact, or it might denote fitness for some purpose, or something else
entirely.
* With an attestation, the metadata is *explicit* and the signature only
denotes who created the attestation. A single keyset can express an
arbitrary amount of information, including things that are not possible with
raw signing. For example, an attestation might state exactly how an artifact
was produced, including the build command that was run and all of its
dependencies.
## Intended Use Case
The primary intended use case is to feed into an
[automated policy framework](policy.md). See that doc for more info.
Other use cases are "nice-to-haves", including ad-hoc analysis.
## Model and Terminology
We define the following model to represent any software attestations, regardless
of format. Not all formats will have all fields or all layers, but to be called
an "attestation" it must fit this general model.
The key words MUST, SHOULD, and MAY are to be interpreted as described in
[RFC 2119](https://tools.ietf.org/html/rfc2119).
<p align="center"><img width="100%" src="images/attestation_layers.svg"></p>
Example in English:
<p align="center"><img width="80%" src="images/attestation_example_english.svg"></p>
Summary:
- **Artifact:** Immutable blob of data, usually identified by cryptographic
content hash. Examples: file content, git commit, Docker image. May also
include a mutable locator, such as a package name or URI.
- **Attestation:** Authenticated, machine-readable metadata about one or more
software artifacts. MUST contain at least:
- **Envelope:** Authenticates the message. At a minimum, it contains:
- **Message:** Content (statement) of the attestation. The message
type SHOULD be authenticated and unambiguous to avoid confusion
attacks.
- **Signature:** Denotes the **attester** who created the attestation.
- **Statement:** Binds the attestation to a particular set of artifacts.
This is a separate layer is to allow for predicate-agnostic processing
and storage/lookup. MUST contain at least:
- **Subject:** Identifies which artifacts the predicate applies to.
- **Predicate:** Metadata about the subject. The predicate type SHOULD
be explicit to avoid misinterpretation.
- **Predicate:** Arbitrary metadata in a predicate-specific schema. MAY
contain:
- **Link:** *(repeated)* Reference to a related artifact, such as
build dependency. Effectively forms a
[hypergraph](https://en.wikipedia.org/wiki/Hypergraph) where the
nodes are artifacts and the hyperedges are attestations. It is
helpful for the link to be standardized to allow predicate-agnostic
graph processing.
- **Bundle:** A collection of Attestations, which are usually but not
necessarily related.
- Note: The bundle itself is unauthenticated. Authenticating multiple
attestations as a unit is [TBD](#compound-statement).
- **Storage/Lookup:** Convention for where attesters place attestations and
how verifiers find attestations for a given artifact.
See [Survey](survey.md) for examples.
## Recommended Suite
We recommend a single suite of formats and conventions that work well together
and have desirable security properties. Our hope is to align the industry around
this particular suite because it makes everything easier. That said, we
recognize that other choices may be necessary in various cases.
Summary: Generate [in-toto](https://in-toto.io) attestations.
* Envelope:
**[secure-systems-lab/signing-spec](https://github.com/secure-systems-lab/signing-spec/)**
(TODO: Recommend Crypto/PKI)
* Statement:
**[in-toto/attestation](https://github.com/in-toto/attestation/)**
* Predicate: Choose as appropriate.
* [Provenance](https://github.com/in-toto/attestation/tree/main/spec/provenance.md)
* [SPDX](https://github.com/in-toto/attestation/tree/main/spec/spdx.md)
* If none are a good fit, invent a new one.
* Bundle and Storage/Lookup:
* Local Filesystem: TODO
* Docker/OCI Registry:
**[sigstore/cosign](https://github.com/sigstore/cosign)**
See [survey](survey.md) for other options.
## Future Extensions
### Expanded artifact definition
TODO: Can a subject of an attestation be something like "GCP project at time T"?
That is logically immutable since the "at time T" cannot change.
### Compound predicate
TODO: One subject but multiple predicates. Should we offer an opinion on whether
this is represented at the Statement layer (repeated predicate) or Predicate
layer (a "compound" type predicate)?
### Compound statement
TODO: One envelope has multiple statements (separate subject+predicate pairs)
signed as a unit, which are not valid individually. Is this one attestation or
multiple?
TODO: Should we represent this as multiple messages within the envelope (i.e. a
shim) or as a new type of Statement that refers to the other Statements (perhaps
too complicated).
### Attestation as an artifact
TODO: If you have separate signed attestations and want to refer to the
collection (e.g. a signed bundle), you can create a statement referring to all
of them as the subject.
TODO: Figure out serialization. Previously I had been thinking envelopes didn't
have to be serialized deterministically, but now if they are an Artifact it does
have to be deterministic/immutable.
## Appendix: Naming
TODO(lodato) Provide a survey of possible names we considered, along with
pros/cons: Attestation, Testimony, Testament, Claim, Voucher, Statement,
Predicate, Message, Finding.
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# Attestation-based Policies
Author: lodato@google.com \
Date: March 2021 \
Status: EARLY DRAFT
## Objective
Standardize the terminology, data model, and interfaces for admission control
policy based on [software attestations](attestations.md).
## Model and Terminology
*TODO: Define what an attestation-based admission control policy is.*
<p align="center"><img width="50%" src="images/policy_model.svg"></p>
To make the decision, a policy engine combines the following:
- The artifact identifier, usually a cryptographic content hash.
- One or more attestations about the artifact or related artifacts.
- A policy describing the requirements as a function of the attestations.
The decision is usually "allow" or "deny". It may be preventative
("enforcement") or detective ("auditing").
*TODO: Better define the policy model, including the notion of attester, subject
verification, logging, etc.*
*TODO: Note that a policy decision may itself be an attestation that can be fed
into further policy decisions down the line.*
*TODO: Two modes: (a) only allow if a "good" attestation exists,
even if there also exists some "bad" attestation; (b) block if some "bad"
attestation exists, even if there also exists some "good" attestation. Talk
about threat model and whether the attestation storage is trusted. (a) is better
for enforcement in the critical path, while (b) is useful for vulnerability
remediation.*
# Survey of Known Technologies
Author: lodato@google.com \
Date: March 2021 \
Status: IN REVIEW
## Objective
Document all known technologies that relate to SLSA, how they map to our model,
and a (hopefully not too biased) assessment of various properties of each.
See [Attestations](attestations.md) and [Policy](policy.md) for the
corresponding models and terminology.
## Overview
The following table provides an overview of how various technologies map to our
model. Subsequent sections analyze each layer.
[Binary Authorization]: https://cloud.google.com/binary-authorization
[JSS]: https://jsonenc.info/jss/1.0/
[JWS]: https://tools.ietf.org/html/rfc7515
[JWT]: https://tools.ietf.org/html/rfc7519
[Notary v2]: https://github.com/notaryproject/nv2
[OpenPGP]: https://tools.ietf.org/html/rfc4880
[PASETO]: https://paseto.io
[SPDX]: https://github.com/spdx/spdx-spec
[Simple Signing]: https://github.com/containers/image/blob/master/docs/containers-signature.5.md
[in-toto v1]: https://github.com/in-toto/docs/blob/master/in-toto-spec.md
[in-toto v2]: https://github.com/in-toto/attestations
[signing-spec]: https://github.com/secure-systems-lab/signing-spec/
Project | Envelope | Statement | Predicate | Storage | Generation | Policy | Status
---------------------- | -------- | --------- | --------- | ------- | ---------- | ------ | ------
Raw signing | ✓ | ✓ | ✗ | | | | (varies)
[JSS] | ✓ | | | | | | Abandoned
[JWS] | ✓ | | | | | | IETF Standard
[JWT] | ✓ | | | | | | IETF Standard
[OpenPGP] | ✓ | | | | | | IETF Standard
[PASETO] | ✓ | | | | | | Stable
[signing-spec] | ✓ | | | | | | In development
[in-toto v1] | ✓ | ✓ | ✓ | | ✓ | ✓ | Stable
[Notary v2] | ~ | ✓ | ✗ | ✓ | | ✓ | In development
[Simple Signing] | ~ | ✓ | | | | | Stable
[in-toto v2] | ~ | ✓ | | | | | In development
[SPDX] | | | ✓ | | | | Stable
[Binary Authorization] | ~ | ~ | ✗ | ~ | | ✓ | Stable
Legend:
* ✓ Defines this layer
* ✗ Does not support this layer
* ~ Imposes requirements on this layer
* (blank) No opinion on this layer
Columns:
* Envelope: Defines the envelope layer of the attestation.
* Statement: Defines the statement layer of the attestation.
* Predicate: Defines the predicate layer of the attestation.
* Storage: Provides a mechanism for attestation storage and retrieval.
* Generation: Provides a mechanism for generating attestations.
* Policy: Provides a mechanism for consuming attestations and rendering policy
decisions.
* Status: Is it available now?
## Envelope Layer (not specific to Attestations)
Property | [signing-spec] | [OpenPGP] | [JWS] | [JWT] | [PASETO] | [in-toto v1] | [JSS]
----------------------- | -------------- | --------- | ----- | ----- | -------- | ------------ | -----
Authenticated Purpose | ✓ | ✗ | ✓ | ✓ | ✗ | ✓ | ✗
Arbitrary Message Type | ✓ | ✓ | ✓ | ✗ | ✗ | ✗ | ✗
Simple | ✓ | ✗ | ✗ | ✗ | ✓ | ✓ | ✓
Avoids Canonicalization | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ | ✓
Pluggable Crypto | ✓ | ✗ | ✓ | ✓ | ✗ | ✓ | ✓
Efficient Encoding | ✓ | ✗ | ✗ | ✗ | ✗ | ✓ | ✗
Widely Adopted | ✗ (not yet!) | ✓ | ✓ | ✓ | ✗ | ✗ | ✗
Properties:
- **Authenticated Purpose:** Does the envelope authenticate how the verifier
should interpret the message in order to prevent confusion attacks?
- ✓ signing-spec: `payloadType`, JWS: `typ`, JWT: `aud`, in-toto v1:
`_type`
- **Arbitrary Message Type:** Does the envelope support arbitrary message
types / encodings?
- ✗ PASETO, JWT, in-toto v1, JSS: only supports JSON messages
- **Simple:** Is the standard simple, easy to understand, and unlikely to be
implemented incorrectly?
- ✗ PGP: Enformous RFC.
- ✗ JWS, JWT: Enormous RFC, many vulnerabilities in the past.
- **Avoids Canonicalization:** Does the protocol avoid relying on
canonicalization for security, in order to reduce attack surface?
- ✗ in-toto v1: Relies on Canonical JSON
- **Pluggable Crypto:** If desired, can the cryptographic algorithm and key
management be swapped out if desired? (Not always desirable.)
- ✗ OpenPGP: Uses PGP
- ✗ PASETO: Mandates very specific algorithms, e.g. ed25519
- **Efficient Encoding:** Does the standard avoid base64, or can the envelope
be re-encoded in a more efficient format, such as protobuf or CBOR, without
invalidating the signature?
- **Widely Adopted:** Is the standard widely adopted?
- ✗ signing-spec: Not yet used, though in-toto and TUF plan to.
- ✗ PASETO: Not common.
- ✗ in-toto v1: Only by in-toto and TUF.
- ✗ JSS: Abandoned, never used.
## Statement Layer
Property | [in-toto v2] | [in-toto v1] | [Simple Signing] | [Notary v2] | Raw Signing
--------------------- | ------------ | ------------ | ---------------- | ----------- | -----------
Recommended Envelope | signing-spec | in-toto v1 | OpenPGP | JWT | (various)
Subject: Clear | ✓ | ✗ | ✓ | ✓ | ✓
Subject: Any Type | ✓ | ✓ | ✗ | ✓ | (depends)
Subject: Multi-Digest | ✓ | ✓ | ✗ | ✗ | (depends)
Predicate: Supported | ✓ | ✓ | ✓ | ✗ | ✗
Predicate: Flexible | ✓ | ✗ (*) | ✓ | (n/a) | (n/a)
Predicate: Typed | ✓ | ✗ | ✗ | (n/a) | (n/a)
Layered | ✓ | ✗ | ✓ | (n/a) | (n/a)
Evolvable | ✓ | ✓ | ✗ | ✓ | ✗
Properties:
- **Recommended Envelope:** Which envelope is recommended (or possibly
required)?
- **Subject: Clear:** Is the Attestation clearly about a particular
attestation?
- ✗ in-toto v1: Subject is ambiguous between `materials` and `products`.
- **Subject: Any Type:** Does Subject support arbitrary Artifact types?
- ✗ Simple Signing: `critical.image` only supports Docker/OCI image
manifests (and because it's `critical`, that field is required.) Also,
`critical.identity` is required but not applicable to all use cases
(e.g. build provenance, where the identity is not yet known).
- **Subject: Multi-Digest:** Does Subject support specifying multiple digest
algorithms for crypto agility?
- ✗ Simple Signing, Notary v2: Only one digest supported. (The `multihash`
algorithm mentioned in the OCI image-spec is not defined or implemented
anywhere.)
- **Predicate: Supported:** Can a predicate be supplied?
- ✗ Notary v2: Does not officially support a predicate. Undefined what
happens if extra predicate fields are added to the JWT.
- **Predicate: Flexible:** Can a user-defined predicate be used?
- ✗ in-toto v1: Several fixed, required predicate fields. Technically
arbitrary data can be added to `environment` but that is not well
documented or standardized.
- ✓ Simple Signing: Can use `optional` field.
- **Predicate: Typed:** Is there a well-established convention of indicating
the meaning of the Attestation and/or the schema of the user-defined
predicate unambiguous?
- **Layered:** Does the schema clearly match the layers of our
[model](#model-and-terminology)?
- ✗ in-toto v1: Statement and Predicate fields are mixed together.
- **Evolvable:** Can the spec be modified to support required features?
- ✗ Simple Signing: The `critical` field can effectively never change
because the producer and consumer must agree in lock step.
## Bundle + Storage/Lookup
- Local filesystem
- (none yet)
- OCI/Docker Registry:
- [sigstore/cosign](https://github.com/sigstore/cosign) **(recommended)**
- [Notary v2]
## Raw artifact signing
For reference, we list examples of raw artifact signing, where the statement
only contains the subject.
- [Node.js](https://github.com/nodejs/node#verifying-binaries)
([example](https://nodejs.org/dist/v14.16.0/SHASUMS256.txt.asc))
- Envelope: PGP Signed Message.
- Statement: List of (sha256, filename) pairs.
## TODO
Show how the following are related:
- Cosign / SigStore
- Kritis
- Grafeas / Container Analysis
- Docker Content Trust
- Notary v1
- "attached" signatures. RPMs, Maven artifacts, Windows drivers, OSX app store
apps
- Android APK signatures
- (Public) transparency ledger?
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