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feat: judge, sign and verify netOrk's images in one place (NetOrk/netork#1390 )

The CIS gate, the SBOM, the cosign signature and the matcher's verdict lived
in NetOrk/base-os, the head of the chain. Every link below it -- base-python,
engine, ui, satellite, the service images -- needs the same, so the tools
move here, and every image repository pins them by commit.

- image_tools: cis.py, cis_os.sh, sbom.py and verify.py from base-os. The
  image's own repository holds its cis.toml and packages.allow; both default
  to the working directory.
- bin/sign.sh signs whatever platforms a reference holds: base-os's index of
  amd64 and arm64 (EXPECT_PLATFORMS) or a dev image's single manifest
  (image_tools/platforms.py).
- bin/verify-base.sh checks every FROM image of a Dockerfile against
  cosign.pub before a build; one without a digest is refused
  (image_tools/dockerfile.py).
- bin/install-cosign.sh installs cosign v3.1.3 for amd64 and arm64 runners,
  checked against the release checksums.
- actions/verify-base, judge, sign wrap them for the workflows.
- cosign.pub is the public half of the COSIGN_PRIVATE_KEY_B64 org secret,
  the key rotated on 2026-10-22.

2026-10-22 16:23:00 +02:00

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image-tools

Judges, signs and verifies the container images of netOrk. Every image repository of NetOrk uses these tools at a pinned commit, so the same rules apply to every link of the chain:

netork/base-os ──► netork/base-python ──► netork/engine, netork/satellite
               └─► netork/ui
               └─► postgres, valkey, signal-api, apt-cacher-ng, unbound

Each link checks the signature of the image it builds on, is judged against CIS, and is signed with its CIS result and SBOM attached (NetOrk/netork#1390).

What it does


CIS gate (`image_tools/cis.py`)	CIS Docker Benchmark 1.6.0 §4 and the CIS Debian Linux 12 controls that make sense in a container. Trivy measures what it automates; `image_tools/cis_os.sh` measures from inside the image. The image's repository decides the rest in its `cis.toml` and names the packages it may hold in `packages.allow`.
SBOM (`image_tools/sbom.py`)	The image's CycloneDX SBOM, as Trivy reads it.
Signature (`bin/sign.sh`)	A cosign signature on the reference and on every platform image behind it, with the CIS result and the SBOM as in-toto attestations. Nothing goes to a public transparency log.
Verification (`bin/verify-base.sh`, `bin/verify-signature.sh`)	Every `FROM` image of a Dockerfile is pinned by digest and signed with the key in `cosign.pub`.
Verdict (`image_tools/verify.py`)	Whether a rebuild improves on the pinned image, by netOrk's matcher (kb-server), for a base's nightly.

Using it in a workflow

- name: Verify the base images
  uses: https://git.netork.io/NetOrk/image-tools/actions/verify-base@<commit>
  with:
    dockerfiles: docker/engine/Dockerfile

# build the image, then:
- name: Judge it
  uses: https://git.netork.io/NetOrk/image-tools/actions/judge@<commit>
  with:
    image: registry.netork.io/netork/engine:main-abc1234
    arch: amd64

# push it, then:
- name: Sign it
  uses: https://git.netork.io/NetOrk/image-tools/actions/sign@<commit>
  env:
    COSIGN_PRIVATE_KEY_B64: ${{ secrets.COSIGN_PRIVATE_KEY_B64 }}
    COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
  with:
    ref: registry.netork.io/netork/engine@sha256:…

The judge action reads cis.toml and packages.allow from the working directory by default. The runner needs Docker, Python 3.11 or newer, and curl; cosign is installed by the actions, pinned and checked against its release checksum (bin/install-cosign.sh).

Verifying an image yourself

cosign verify --key cosign.pub --insecure-ignore-tlog registry.netork.io/netork/base-os@sha256:…
cosign verify-attestation --key cosign.pub --insecure-ignore-tlog \
  --type https://netork.io/attestations/cis/v1 registry.netork.io/netork/base-os@sha256:…

cosign.pub is the public half of the COSIGN_PRIVATE_KEY_B64 organization secret. The private key comes base64 in one line: the runner masks a secret only where it appears whole.

Development

pip install pytest ruff pyyaml shellcheck-py
pytest -q
ruff format --check . && ruff check .
shellcheck bin/*.sh image_tools/cis_os.sh

License

MIT, see LICENSE.

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