Merge pull request #1821 from kube-logging/feat/add-image-and-chart-s…

…igning

feat: add image and chart signing

.github/workflows/artifacts.yaml

@@ -66,6 +66,9 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@4c0219f9ac95b02789c1075625400b2acbff50b1 # v2.9.1
 
+      - name: Set up Cosign
+        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 # v3.5.0
+
       - name: Set image name
         id: image-name
         run: echo "value=ghcr.io/${{ github.repository }}" >> "$GITHUB_OUTPUT"
@@ -88,7 +91,6 @@ jobs:
             org.opencontainers.image.authors=Kube logging authors
             org.opencontainers.image.documentation=https://kube-logging.dev/docs/
 
-
       # Multiple exporters are not supported yet
       # See https://github.com/moby/buildkit/pull/2760
       - name: Determine build output
@@ -120,6 +122,31 @@ jobs:
           outputs: ${{ steps.build-output.outputs.value }},name=target,annotation-index.org.opencontainers.image.description=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.description'] }}
           # push: ${{ inputs.publish }}
 
+      - name: Sign image with GitHub OIDC Token
+        if: ${{ inputs.publish && github.repository_owner == 'kube-logging' }} # Check if the workflow is called by the same GitHub organization
+        env:
+          DIGEST: ${{ steps.build.outputs.digest }}
+          TAGS: ${{ steps.meta.outputs.tags }}
+        run: |
+          images=""
+          for tag in ${TAGS}; do
+            images+="${tag}@${DIGEST} "
+          done
+          
+          cosign sign --yes ${images}
+
+      - name: Verify signed image with cosign
+        if: ${{ inputs.publish && github.repository_owner == 'kube-logging' }} # Check if the workflow is called by the same GitHub organization
+        env:
+          DIGEST: ${{ steps.build.outputs.digest }}
+          TAGS: ${{ steps.meta.outputs.tags }}
+        run: |
+          for tag in ${TAGS}; do
+            cosign verify "${tag}@${DIGEST}" \
+            --certificate-identity "https://github.com/${{ github.repository }}/.github/workflows/artifacts.yaml@${{ github.ref }}" \
+            --certificate-oidc-issuer "https://token.actions.githubusercontent.com"
+          done
+
       - name: Set image ref
         id: image-ref
         run: echo "value=${{ steps.image-name.outputs.value }}@${{ steps.build.outputs.digest }}" >> "$GITHUB_OUTPUT"
@@ -176,6 +203,9 @@ jobs:
         with:
           version: v3.12.0
 
+      - name: Set up Cosign
+        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 # v3.5.0
+
       - name: Set chart name
         id: chart-name
         run: echo "value=${{ github.event.repository.name }}" >> "$GITHUB_OUTPUT"
@@ -220,11 +250,29 @@ jobs:
         if: inputs.publish && inputs.release
 
       - name: Helm push
-        run: helm push ${{ steps.build.outputs.package }} oci://${{ steps.oci-registry-name.outputs.value }}
+        id: push
+        run: |
+          helm push ${{ steps.build.outputs.package }} oci://${{ steps.oci-registry-name.outputs.value }} &> push-metadata.txt
+          echo "digest=$(awk '/Digest: /{print $2}' push-metadata.txt)" >> "$GITHUB_OUTPUT"
         env:
           HELM_REGISTRY_CONFIG: ~/.docker/config.json
         if: inputs.publish && inputs.release
 
+      - name: Sign chart with GitHub OIDC Token
+        if: ${{ inputs.publish && inputs.release && github.repository_owner == 'kube-logging' }} # Check if the workflow is called by the same GitHub organization
+        env:
+          DIGEST: ${{ steps.push.outputs.digest }}
+        run: cosign sign --yes "${{ steps.oci-chart-name.outputs.value }}@${DIGEST}"
+
+      - name: Verify signed chart with cosign
+        if: ${{ inputs.publish && inputs.release && github.repository_owner == 'kube-logging' }} # Check if the workflow is called by the same GitHub organization
+        env:
+          DIGEST: ${{ steps.push.outputs.digest }}
+        run: |
+          cosign verify "${{ steps.oci-chart-name.outputs.value }}@${DIGEST}" \
+            --certificate-identity "https://github.com/${{ github.repository }}/.github/workflows/artifacts.yaml@${{ github.ref }}" \
+            --certificate-oidc-issuer "https://token.actions.githubusercontent.com"
+
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@6e7b7d1fd3e4fef0c5fa8cce1229c54b2c9bd0d8 # 0.24.0
         with: