Christian Manivong
9232b54c6d
CI / Tests, lint (push) Successful in 11s
base-os's nightly asks netOrk's matcher whether a rebuild improves on the pin (image_tools/verify.py). As an action, a workflow needs nothing of this repository but the pinned commit: no install, no checkout. A verdict that could not be reached fails the step, as it does in base-os since the two nights with an empty NETORK_LICENSE_KEY.
88 lines
3.5 KiB
Markdown
88 lines
3.5 KiB
Markdown
# image-tools
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Judges, signs and verifies the container images of [netOrk](https://git.netork.io/NetOrk/netork).
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Every image repository of NetOrk uses these tools at a pinned commit, so the same rules apply
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to every link of the chain:
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```
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netork/base-os ──► netork/base-python ──► netork/engine, netork/satellite
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└─► netork/ui
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└─► postgres, valkey, signal-api, apt-cacher-ng, unbound
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```
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Each link checks the signature of the image it builds on, is judged against CIS, and is signed
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with its CIS result and SBOM attached (NetOrk/netork#1390).
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## What it does
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| **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`. |
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| **SBOM** (`image_tools/sbom.py`) | The image's CycloneDX SBOM, as Trivy reads it. |
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| **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. |
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| **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`. |
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| **Verdict** (`image_tools/verify.py`) | Whether a rebuild improves on the pinned image, by netOrk's matcher (kb-server), for a base's nightly. |
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## Using it in a workflow
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```yaml
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- name: Verify the base images
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uses: https://git.netork.io/NetOrk/image-tools/actions/verify-base@<commit>
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with:
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dockerfiles: docker/engine/Dockerfile
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# build the image, then:
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- name: Judge it
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uses: https://git.netork.io/NetOrk/image-tools/actions/judge@<commit>
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with:
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image: registry.netork.io/netork/engine:main-abc1234
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arch: amd64
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# a base's nightly, to decide whether its pin moves:
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- name: Judge it against the pin
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id: verdict
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uses: https://git.netork.io/NetOrk/image-tools/actions/verdict@<commit>
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env:
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NETORK_LICENSE_KEY: ${{ secrets.NETORK_LICENSE_KEY }}
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with:
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current: registry.netork.io/netork/base-os:pinned
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candidate: registry.netork.io/netork/base-os:13-20261022.3-amd64
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# push it, then:
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- name: Sign it
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uses: https://git.netork.io/NetOrk/image-tools/actions/sign@<commit>
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env:
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COSIGN_PRIVATE_KEY_B64: ${{ secrets.COSIGN_PRIVATE_KEY_B64 }}
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COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
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with:
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ref: registry.netork.io/netork/engine@sha256:…
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```
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The judge action reads `cis.toml` and `packages.allow` from the working directory by default.
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The runner needs Docker, Python 3.11 or newer, and `curl`; cosign is installed by the actions,
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pinned and checked against its release checksum (`bin/install-cosign.sh`).
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## Verifying an image yourself
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```bash
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cosign verify --key cosign.pub --insecure-ignore-tlog registry.netork.io/netork/base-os@sha256:…
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cosign verify-attestation --key cosign.pub --insecure-ignore-tlog \
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--type https://netork.io/attestations/cis/v1 registry.netork.io/netork/base-os@sha256:…
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```
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`cosign.pub` is the public half of the `COSIGN_PRIVATE_KEY_B64` organization secret. The private
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key comes base64 in one line: the runner masks a secret only where it appears whole.
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## Development
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```bash
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pip install pytest ruff pyyaml shellcheck-py
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pytest -q
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ruff format --check . && ruff check .
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shellcheck bin/*.sh image_tools/cis_os.sh
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```
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## License
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MIT, see [LICENSE](LICENSE).
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