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# attest-sbom
# `actions/attest-sbom`
GitHub Action to create, sign and upload a SBOM (Software Bill of Materials)
attestation for artifacts built as part of a workflow.
Generate signed SBOM attestations for workflow artifacts. Internally powered by
the [@actions/attest-sbom][1] package.
Attestations bind some subject (a named artifact along with its digest) to a a
Software Bill of Materials (SBOM) using the [in-toto][2] format. The action
accepts SBOMs which have been generated by external tools or can generate one
automatically by invoking the [anchore/sbom-action][3]. Externally generated
SBOMs must be in either the [SPDX][4] or [CycloneDX][5] JSON-serialized format.
A verifiable signature is generated for the attestation using a short-lived
[Sigstore][6]-issued signing certificate. If the repository initiating the
GitHub Actions workflow is public, the public-good instance of Sigstore will be
used to generate the attestation signature. If the repository is
private/internal, it will use the GitHub private Sigstore instance.
Once the attestation has been created and signed, it will be uploaded to the GH
attestations API and associated with the repository from which the workflow was
initiated.
Attestations can be verified using the `attestation` command in the [GitHub
CLI][7].
## Usage
Within the GitHub Actions workflow which builds some artifact you would like to
attest,
attest:
1. Ensure that the following permissions are set:
```yaml
permissions:
id-token: write
contents: write
contents: write # TODO: Update this
```
The `id-token` permission gives the action the ability to mint the OIDC token
necessary to request a Sigstore signing certificate. The `contents`
permission is necessary to persist the attestation.
> **NOTE**: The set of required permissions will be refined in a future
> release.
1. After your artifact build step, add the following:
1. Add the following to your workflow after your artifact has been built:
```yaml
- uses: actions/attest-sbom@main
- uses: actions/attest-sbom@v1
with:
path:
subject-path: '${{ github.workspace }}/PATH_TO_FILE'
format: 'spdx'
subject-path: '<PATH TO ARTIFACT>'
```
The `subject-path` parameter should identity the artifact for which you want
to generate an attestation.
### What is being attested?
The generated attestation is a Software Bill of Materials (SBOM), which is
essentially a detailed list of all the components in a software artifact.
```json
{
"_type": "https://in-toto.io/Statement/v1",
"subject": [
{
"name": "subject",
"digest": {
"sha256": "7d070f6b64d9bcc530fe99cc21eaaa4b3c364e0b2d367d7735671fa202a03b32"
}
}
],
"predicateType": "https://spdx.dev/Document/v2.3",
"predicate": {
"spdxVersion": "SPDX-2.3",
"dataLicense": "CC0-1.0",
"SPDXID": "SPDXRef-DOCUMENT",
"name": "./",
"documentNamespace": "https://anchore.com/syft/dir/80b363b6-87f4-4162-853f-60d402537d20",
"creationInfo": {
"licenseListVersion": "3.22",
"creators": [
"Organization: Anchore, Inc",
"Tool: syft-0.103.1"
],
"created": "2024-01-31T18:22:50Z"
},
"packages": [
{
"name": "@ampproject/remapping",
"SPDXID": "SPDXRef-Package-npm--ampproject-remapping-5266573ba4f24a42",
"versionInfo": "2.2.1",
"supplier": "NOASSERTION",
"downloadLocation": "NOASSERTION",
"filesAnalyzed": false,
"sourceInfo":
"acquired package info from installed node module manifest file: /yarn.lock",
"licenseConcluded": "NOASSERTION",
"licenseDeclared": "Apache-2.0",
"copyrightText": "NOASSERTION",
"externalRefs": [
{
"referenceCategory": "SECURITY",
"referenceType": "cpe23Type",
"referenceLocator":
"cpe:2.3:a:\\@ampproject\\/remapping:\\@ampproject\\/remapping:2.2.1:*:*:*:*:*:*:*"
},
{
"referenceCategory": "PACKAGE-MANAGER",
"referenceType": "purl",
"referenceLocator": "pkg:npm/%40ampproject/remapping@2.2.1"
}
]
}
]
}
}
```
The SBOM statement is signed with a short-lived, [Sigstore][1]-issued
certificate.
If the repository initiating the GitHub Actions workflow is public, the public
instance of Sigstore will be used to generate the attestation signature. If the
repository is private, it will use the GitHub private Sigstore instance.
### Where does the attestation go?
On the actions summary page for a repository you'll see an "Attestations" link
which will take you to a list of all the attestations generated by workflows in
that repository.
![Actions summary view](./.github/attestations.png)
### How are attestations verified?
Attestations can be verified using the [gh-attestation][2] extension for the
[GitHub CLI][3].
## Customization
See [action.yml](action.yml)
to generate an SBOM attestation. When no other inputs are specified, the
action will automatically generate an SPDX SBOM by scanning the
`github.workspace` directory.
### Inputs
- `path` - A path to a directory on the filesystem to scan and generate SBOM.
See [action.yml](action.yml)
If `sbom-path` is specified, the path will not be used to generate SBOM.
```yaml
- uses: actions/attest@v1
with:
# Path to the artifact serving as the subject of the attestation. Must
# specify exactly one of "subject-path" or "subject-digest".
subject-path:
- `sbom-path` - A path to a directory on the filesystem which contains SBOM for signing
and uploading.
# SHA256 digest of the subject for for the attestation. Must be in the form
# "sha256:hex_digest" (e.g. "sha256:abc123..."). Must specify exactly one
# of "subject-path" or "subject-digest".
subject-digest:
If `sbom-path` is not specified, the default implementation will be used
`path` to generate SBOM for signing.
# Subject name as it should appear in the attestation. Required unless
# "subject-path" is specified, in which case it will be inferred from the
# path.
subject-name:
- `format` - The format of the SBOM. Either `spdx` or `cyclonedx`
# Path to the JSON-formatted SBOM file to attest. When specified, the
# "scan-path" and "sbom-format" inputs are ignored.
sbom-path:
- `subject-path` - Path to the artifact for which the SBOM statement will be
generated.
# Path on the filesystem to scan for SBOM generation. Ignored if "sbom-path"
# is specified. Defaults to ${{ github.workspace }}
scan-path:
Must specify exactly one of `subject-path` or `subject-digest`. Wildcards can
be used to identify more than one artifact.
# Format to use for the generated SBOM output. Supported formats are
# "spdx" and "cyclonedx". Ignored if "sbom-path" is specified. Defaults to
# "spdx".
sbom-format:
- `subject-digest` - Digest of the subject for which the SBOM statement will be
generated.
# Whether to push the attestation to the image registry. Requires that the
# "subject-name" parameter specify the fully-qualified image name and that
# the "subject-digest" parameter be specified. Defaults to false.
push-to-registry:
Only SHA-256 digests are accepted and the supplied value must be in the form
"sha256:\<hex-encoded-digest\>". Must specify exactly one of `subject-path` or
`subject-digest`.
- `subject-name` - Subject name as it should appear in the SBOM statement.
Required when the subject is identified by the `subject-digest` parameter.
When attesting container images, the name should be the fully qualified image
name.
- `push-to-registry` - If true, the signed attestation is pushed to the
container registry identified by the `subject-name`. Default: `false`.
- `github-token` - Token used to make authenticated requests to the GitHub API.
Default: `${{ github.token }}`.
The supplied token must have the permissions necessary to write attestations
to the repository.
# The GitHub token used to make authenticated API requests. Default is
# ${{ github.token }}
github-token:
```
### Outputs
- `bundle-path` - The file path of JSON-serialized [Sigstore bundle][4] containing
the attestation and related verification material.
<!-- markdownlint-disable MD013 -->
## Sample Workflows
| Name | Description | Example |
| ------------- | -------------------------------------------------------------- | ----------------------- |
| `bundle-path` | Absolute path to the file containing the generated attestation | `/tmp/attestaion.jsonl` |
### Identify Artifact by Path
<!-- markdownlint-enable MD013 -->
For the basic use case, simply add the `attest-sbom` action to
your workflow and supply the path to the artifact for which you want to generate
SBOM.
Attestations are saved in the JSON-serialized [Sigstore bundle][8] format.
If multiple subjects are being attested at the same time, each attestation will
be written to the output file on a separate line (using the [JSON Lines][9]
format).
## Examples
### Identify Subject and SBOM by Path
For the basic use case, simply add the `attest-sbom` action to your workflow and
supply the path to the artifact and SBOM for which you want to generate
attestation.
```yaml
name: attest-sbom
name: build-attest
on:
workflow_dispatch:
@@ -194,61 +136,35 @@ jobs:
- name: Checkout
uses: actions/checkout@v4
- name: Build artifact
run: make some-app
- name: Attest SBOM
uses: actions/attest-sbom@main
run: make my-app
- name: Generate SBOM
run: make sbom
- name: Attest
uses: actions/attest-sbom@v1
with:
subject-path: '${{ github.workspace }}/some-app'
path: '.'
format: 'spdx'
subject-path: '${{ github.workspace }}/my-app'
sbom-path: '${{ github.workspace }}/my-app.sbom.spdx.json'
```
### Identify Artifacts by Wildcard
### Identify Subjects by Wildcard
If you are generating multiple artifacts, you can generate sbom for
each artifact by using a wildcard in the `subject-path` input.
If you are generating multiple artifacts, you can generate an attestation for
each by using a wildcard in the `subject-path` input.
```yaml
name: build-wildcard-with-sbom
on:
workflow_dispatch:
jobs:
build:
permissions:
id-token: write
contents: write
steps:
- name: Checkout
uses: actions/checkout@v4
- name: Set up Go
uses: actions/setup-go@v4
- name: Run GoReleaser
uses: goreleaser/goreleaser-action@v5
with:
distribution: goreleaser
version: latest
args: release --clean
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
- name: Attest artifact
uses: actions/attest-sbom@main
with:
subject-path: 'dist/**/my-bin-*'
path: '.'
format: 'spdx'
- uses: actions/attest-sbom@v1
with:
subject-path: 'dist/**/my-bin-*'
sbom-path: '${{ github.workspace }}/my-bin.sbom.spdx.json'
```
For supported wildcards along with behavior and documentation, see
[@actions/glob][5] which is used internally to search for files.
[@actions/glob][10] which is used internally to search for files.
### Container Image
When working with container images you may not have a `subject-path` value you
can supply. In this case you can invoke the action with the `subject-name` and
`subject-digest` inputs.
When working with container images you can invoke the action with the
`subject-name` and `subject-digest` inputs.
If you want to publish the attestation to the container registry with the
`push-to-registry` option, it is important that the `subject-name` specify the
@@ -260,7 +176,7 @@ the specific image being attested is identified by the supplied digest.
> registry portion of the image name.
```yaml
name: build-image-with-sbom
name: build-attested-image
on:
push:
@@ -293,27 +209,26 @@ jobs:
context: .
push: true
tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
- name: Generate SBOM from Docker Image
id: sbom
uses: anchore/sbom-action@v0
- name: Generate SBOM
run: make sbom
- name: Attest
uses: actions/attest-sbom@v1
id: attest
with:
image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
registry-username: ${{ github.actor }}
registry-password: ${{ secrets.GITHUB_TOKEN }}
format: "spdx-json"
output-file: "sbom.json"
- name: Attest SBOM
uses: actions/attest-sbom@main
id: attest-sbom
with:
sbom-path: "sbom.json"
subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
subject-digest: ${{ steps.push.outputs.digest }}
format: "spdx"
sbom-path: 'sbom.cyclonedx.json'
push-to-registry: true
```
[1]: https://www.sigstore.dev/
[2]: https://github.com/github-early-access/gh-attestation
[3]: https://cli.github.com/
[4]: https://github.com/sigstore/protobuf-specs/blob/main/protos/sigstore_bundle.proto
[5]: https://github.com/actions/toolkit/tree/main/packages/glob#patterns
[1]: https://github.com/actions/toolkit/tree/main/packages/attest
[2]: https://github.com/in-toto/attestation/tree/main/spec/v1
[3]: https://github.com/anchore/sbom-action
[4]: https://spdx.dev/
[5]: https://cyclonedx.org/
[6]: https://www.sigstore.dev/
[7]: https://cli.github.com/
[8]:
https://github.com/sigstore/protobuf-specs/blob/main/protos/sigstore_bundle.proto
[9]: https://jsonlines.org/
[10]: https://github.com/actions/toolkit/tree/main/packages/glob#patterns