sbom-operator

Catalogue all images of a Kubernetes cluster to multiple targets with Syft.

Overview

This operator maintains a central place to track all packages and software used in all those images in a Kubernetes cluster. For this a Software Bill of Materials (SBOM) is generated from each image with Syft. They are all stored in one or more targets. Currently Git and Dependency Track is supported. With this it is possible to do further analysis, vulnerability scans and much more in a single place. To prevent scans of images that have already been analyzed pods are annotated with the imageID of the already processed image.

Kubernetes Compatibility

The image contains versions of k8s.io/client-go. Kubernetes aims to provide forwards & backwards compatibility of one minor version between client and server:

sbom-operator	k8s.io/{api,apimachinery,client-go}	expected kubernetes compatibility
main	v0.24.0	1.23.x, 1.24.x, 1.25.x
0.11.0	v0.24.0	1.23.x, 1.24.x, 1.25.x
0.10.0	v0.23.6	1.22.x, 1.23.x, 1.24.x
0.9.0	v0.23.5	1.22.x, 1.23.x, 1.24.x
0.8.0	v0.23.5	1.22.x, 1.23.x, 1.24.x
0.7.0	v0.23.4	1.22.x, 1.23.x, 1.24.x
0.6.0	v0.23.4	1.22.x, 1.23.x, 1.24.x
0.5.0	v0.23.4	1.22.x, 1.23.x, 1.24.x
0.4.1	v0.23.3	1.22.x, 1.23.x, 1.24.x
0.3.1	v0.23.3	1.22.x, 1.23.x, 1.24.x
0.2.0	v0.23.2	1.22.x, 1.23.x, 1.24.x
0.1.0	v0.23.2	1.22.x, 1.23.x, 1.24.x

However, the operator will work with more versions of Kubernetes in general.

Container Registry Support

The operator relies on the go-containeregistry library to download images. It should work with most registries. These are officially tested (with authentication):

ACR (Azure Container Registry) (currently not unit-tested)
ECR (Amazon Elastic Container Registry)
GAR (Google Artifact Registry)
GCR (Google Container Registry)
GHCR (GitHub Container Registry)
DockerHub

Installation

Manifests

kubectl apply -f deploy/standard/

Helm-Chart

Create a YAML file first with the required configurations or use helm-flags instead.

helm repo add ckotzbauer https://ckotzbauer.github.io/helm-charts
helm install ckotzbauer/sbom-operator -f your-values.yaml

Configuration

All parameters are cli-flags.

Parameter	Required	Default	Description
`verbosity`	`false`	`info`	Log-level (debug, info, warn, error, fatal, panic)
`cron`	`false`	`@hourly`	Backround-Service interval (CRON). All options from github.com/robfig/cron are allowed
`ignore-annotations`	`false`	`false`	Force analyzing of all images, including those from annotated pods.
`format`	`false`	`json`	SBOM-Format.
`targets`	`false`	`git`	Comma-delimited list of targets to sent the generated SBOMs to. Possible targets `git`, `dtrack`, `oci`
`git-workingtree`	`false`	`/work`	Directory to place the git-repo.
`git-repository`	`true` when `git` target is used.	`""`	Git-Repository-URL (HTTPS).
`git-branch`	`false`	`main`	Git-Branch to checkout.
`git-path`	`false`	`""`	Folder-Path inside the Git-Repository.
`git-access-token`	`true` when `git` target is used.	`""`	Git-Personal-Access-Token with write-permissions.
`git-author-name`	`true` when `git` target is used.	`""`	Author name to use for Git-Commits.
`git-author-email`	`true` when `git` target is used.	`""`	Author email to use for Git-Commits.
`pod-label-selector`	`false`	`""`	Kubernetes Label-Selector for pods.
`namespace-label-selector`	`false`	`""`	Kubernetes Label-Selector for namespaces.
`dtrack-base-url`	`true` when `dtrack` target is used	`""`	Dependency-Track base URL, e.g. 'https://dtrack.example.com'
`dtrack-api-key`	`true` when `dtrack` target is used	`""`	Dependency-Track API key
`kubernetes-cluster-id`	`false`	`"default"`	Kubernetes Cluster ID (to be used in Dependency-Track or Job-Images)
`fallback-image-pull-secret`	`false`	`""`	Kubernetes Pull-Secret Name to load as a fallback when all others fail (must be in the same namespace as the sbom-operator)
`job-image`	`false`	`""`	Job-Image to process images with instead of Syft
`job-image-pull-secret`	`false`	`""`	Pre-existing pull-secret-name for private job-images
`job-timeout`	`false`	`3600`	Job-Timeout in seconds (`activeDeadlineSeconds`)
`oci-registry`	`true` when `oci` target is used	`""`	OCI-Registry
`oci-user`	`true` when `oci` target is used	`""`	OCI-User
`oci-token`	`true` when `oci` target is used	`""`	OCI-Token

The flags can be configured as args or as environment-variables prefixed with SBOM_ to inject sensitive configs as secret values.

Example Helm-Config

args:
  targets: git
  git-author-email: XXX
  git-author-name: XXX
  git-repository: https://github.com/XXX/XXX
  git-path: dev-cluster/sboms
  verbosity: debug
  cron: "0 30 * * * *"

envVars:
  - name: SBOM_GIT_ACCESS_TOKEN
    valueFrom:
      secretKeyRef:
        name: "sbom-operator"
        key: "accessToken"

Targets

It is possible to store the generated SBOMs to different targets (even multple at once).

Dependency Track

Each image in the cluster is created as project with the full-image name (registry and image-path without tag) and the image-tag as project-version. The autoCreate option of DT is used. You have to set the --format flag to cyclonedx with this target.

Git

The operator will save all files with a specific folder structure as described below. When a git-path is configured, all folders above this path are not touched from the application. Assuming that git-path is set to dev-cluster/sboms. When no git-path is given, the structure below is directly in the repository-root. The structure is basically <git-path>/<registry-server>/<image-path>/<image-digest>/sbom.json. The file-extension may differ when another output-format is configured. A token-based authentication to the git-repository is used.

dev-cluster
│
└───sboms
    │
    └───docker.io
    |   │
    |   └───library
    |       │
    |       └───busybox
    |           │
    |           └───sha256_ae39a6f5...
    |               │   sbom.json
    |
    └───ghcr.io
        │
        └───kyverno
            │
            └───kyverno
            |   │
            |   └───sha256_9e3f14e5...
            |       │   sbom.json
            |
            └───kyvernopre
                │
                └───sha256_e48f87fd...
                    │   sbom.json
            |
            └───policy-reporter
                │
                └───sha256_b70caa7a...
                    │   sbom.json

OCI-Registry

In this mode the operator will generate a SBOM and store it into an OCI-Registry. The SBOM then can be processed by cosign, Kyverno or any other tool. E.g.:

COSIGN_REPOSITORY=<yourregistry> cosign download sbom <your full image digest>

Job-Images

If you don't want to use Syft to analyze your images, you can give the Job-Image feature a try. The operator creates a Kubernetes-Job which does the analysis with any possible tool inside. There's no target-handling done by the operator, the tool from the job has to process the SBOMs on its own. Currently there are two possible integrations:

Tool	Description
Codenotary CAS	The Community Attestation Service from Codenotary can notarize your images in the Codenotary Cloud. (free)
Codenotary VCN	The VCN-Tool from Codenotary can notarize your images in the Codenotary Cloud. (chargeable)

This feature is built as generic approach. Any image which follows these specs can be used as job-image.

e.g. Manifest (deploy/job-image):

--job-image=ghcr.io/ckotzbauer/sbom-operator/cas:<TAG>

e.g. Helm:

jobImageMode: true

envVars:
  - name: SBOM_JOB_CAS_API_KEY
    value: "<KEY>"

All operator-environment variables prefixed with SBOM_JOB_ are passed to the Kubernetes job.

Security

The docker-image is based on scratch to reduce the attack-surface and keep the image small. Furthermore the image and release-artifacts are signed with cosign and attested with provenance-files. The release-process satisfies SLSA Level 2. All of those "metadata files" are also stored in a dedicated repository ghcr.io/ckotzbauer/sbom-operator-metadata. Both, SLSA and the signatures are still experimental for this project. When discovering security issues please refer to the Security process.

Contributing

Please refer to the Contribution guildelines.

Code of conduct

Please refer to the Conduct guildelines.

outofcoffee / sbom-operator

sbom-operator

Overview

Kubernetes Compatibility

Container Registry Support

Installation

Manifests

Helm-Chart

Configuration

Example Helm-Config

Targets

Dependency Track

Git

OCI-Registry

Job-Images

Security

Contributing

License

Changelog

Contributing

Code of conduct

About

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