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Sign images using Cosign v2 #1176

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Apr 12, 2023
Merged

Sign images using Cosign v2 #1176

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9 changes: 2 additions & 7 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -128,18 +128,13 @@ jobs:
uses: actions/[email protected]

- name: Install Cosign
uses: sigstore/cosign-installer@v2.7.0
uses: sigstore/cosign-installer@v3.0.2

- name: Distroless verify
run: |
diff <(grep FROM docker/kubeseal.Dockerfile | awk '{print $2}') \
<(grep FROM docker/controller.Dockerfile | awk '{print $2}')
cosign verify --key /dev/stdin "$(grep FROM docker/controller.Dockerfile | awk '{print $2}')" <<EOF
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEWZzVzkb8A+DbgDpaJId/bOmV8n7Q
OqxYbK0Iro6GzSmOzxkn+N2AKawLyXi84WSwJQBK//psATakCgAQKkNTAA==
-----END PUBLIC KEY-----
EOF
cosign verify "$(grep FROM docker/controller.Dockerfile | awk '{print $2}')" --certificate-oidc-issuer https://accounts.google.com --certificate-identity [email protected]

- name: Setup kubecfg
run: |
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4 changes: 2 additions & 2 deletions .github/workflows/release.yaml
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Expand Up @@ -60,7 +60,7 @@ jobs:

# Setup Cosign
- name: Install Cosign
uses: sigstore/cosign-installer@v2.7.0
uses: sigstore/cosign-installer@v3.0.2
- name: Write Cosign key
run: echo "$COSIGN_KEY" > /tmp/cosign.key
env:
Expand Down Expand Up @@ -134,7 +134,7 @@ jobs:
tags: ${{ steps.meta_kubeseal.outputs.tags }}
- name: Sign controller image with a key in GHCR
run: |
echo -n "$COSIGN_PASSWORD" | cosign sign --key /tmp/cosign.key $TAG_CURRENT
echo -n "$COSIGN_PASSWORD" | cosign sign --key /tmp/cosign.key --yes $TAG_CURRENT
env:
COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
TAG_CURRENT: ${{ steps.meta_controller.outputs.tags }}
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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -716,6 +716,8 @@ kubeseal <mysecret.json >mysealedsecret.json

Our images are being signed using [cosign](https://github.com/sigstore/cosign). The signatures have been saved in our [GitHub Container Registry](https://ghcr.io/bitnami-labs/sealed-secrets-controller/signs).

> Images up to and including v0.20.2 were signed using Cosign v1. Newer images are signed with Cosign v2.

It is pretty simple to verify the images:

```bash
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