add docker image scanner

2026-06-12 15:10:21 +02:00
parent 364171ebca
commit f92d92355a
2 changed files with 108 additions and 0 deletions
@@ -0,0 +1,70 @@
+name: Reusable Image Security Checks
+
+on:
+  workflow_call:
+    inputs:
+      image_name:
+        required: true
+        type: string
+      image_tag:
+        type: string
+        default: "latest"
+      scan_severity:
+        type: string
+        default: "HIGH,CRITICAL"
+    secrets:
+      REGISTRY_USERNAME: { required: true }
+      REGISTRY_PASSWORD: { required: true }
+      DOCKER_REGISTRY: { required: true }
+
+jobs:
+  scan:
+    runs-on: docker
+    container:
+      image: gitea.tech-buddy.at/bitbuddydev/gitea_runner_python314:dev-bda315b82bb23d83065b77d91fedf0e20d9accf1
+      credentials:
+        username: ${{ secrets.REGISTRY_USERNAME }}
+        password: ${{ secrets.REGISTRY_PASSWORD }}
+
+    steps:
+      - name: Docker Login
+        run: |
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login "${{ secrets.DOCKER_REGISTRY }}" -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
+
+      - name: Pull Image
+        shell: bash
+        run: |
+          set -euo pipefail
+          FULL_IMAGE="${{ secrets.DOCKER_REGISTRY }}/${{ inputs.image_name }}:${{ inputs.image_tag }}"
+          echo "=== Pulling ${FULL_IMAGE} ==="
+          docker pull "${FULL_IMAGE}"
+
+      - name: Image Vulnerability Scan
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          # Fallback for runner images without Trivy baked in. Pinned version +
+          # checksum, never "latest": Trivy releases were compromised in the
+          # March 2026 supply-chain incident (malicious v0.69.4). Keep in sync
+          # with the ARGs in the PipelineImage Dockerfiles.
+          TRIVY_VERSION=0.71.0
+          TRIVY_SHA256=30a3d22b23f88c233f1658f562fb477cae3b3e8b4761109d515b7698daf85814
+          if ! command -v trivy >/dev/null 2>&1; then
+            echo "=== Trivy not in runner image, installing v${TRIVY_VERSION} ==="
+            curl -sSfLO "https://github.com/aquasecurity/trivy/releases/download/v${TRIVY_VERSION}/trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz"
+            echo "${TRIVY_SHA256}  trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz" | sha256sum -c -
+            tar -xzf "trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz" -C /usr/local/bin trivy
+            rm "trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz"
+          fi
+          trivy --version
+
+          FULL_IMAGE="${{ secrets.DOCKER_REGISTRY }}/${{ inputs.image_name }}:${{ inputs.image_tag }}"
+
+          echo "=== Scanning ${FULL_IMAGE} (fail on fixable ${{ inputs.scan_severity }}) ==="
+          trivy image \
+            --exit-code 1 \
+            --severity "${{ inputs.scan_severity }}" \
+            --ignore-unfixed \
+            --scanners vuln,secret \
+            "${FULL_IMAGE}"