Add GitHub action that checks the latest release for vulnerabilities …

…and reports them in an issue

Signed-off-by: Sascha Schwarze <[email protected]>

.github/report-release-vulnerabilities.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# download the release.yaml
+gh release download --clobber --pattern release.yaml --output /tmp/release.yaml
+
+# extract the images
+readarray -t images < <(grep ghcr.io /tmp/release.yaml | sed -E 's/(image|value)://' | tr -d ' ' | sort -u)
+
+# capture whether vulnerabilities exist
+hasVulnerabilities=false
+
+# iterate the images
+true>/tmp/report.md
+for image in "${images[@]}"; do
+  echo "[INFO] Checking image ${image}"
+  echo "## ${image}" >>/tmp/report.md
+
+  # OS vulnerabilities
+  echo "  [INFO] Checking for OS vulnerabilities"
+  echo "### OS vulnerabilities" >>/tmp/report.md
+  osVulns="$(trivy image --ignore-unfixed --no-progress --pkg-types os --scanners vuln --timeout 10m "${image}" --format json)"
+  osVulnsFound=false
+  while read -r id pkg severity vulnerableVersion fixedVersion; do
+    if [ "${id}" == "" ]; then
+      continue
+    fi
+
+    if [ "${osVulnsFound}" == "false" ]; then
+      echo "| Vulnerability | Package | Severity | Version |" >>/tmp/report.md
+      echo "| -- | -- | -- | -- |" >>/tmp/report.md
+      osVulnsFound=true
+      hasVulnerabilities=true
+    fi
+
+    severityLower="$(tr '[:upper:]' '[:lower:]' <<<"${severity}")"
+
+    echo "    [INFO] Found ${id} in ${pkg} with severity ${severityLower}. Requires upgrade from ${vulnerableVersion} to ${fixedVersion}."
+    echo "| ${id} | ${pkg} | ${severityLower} | ${vulnerableVersion} -> ${fixedVersion} |" >>/tmp/report.md
+  done <<<"$(jq --raw-output '.Results[0].Vulnerabilities[] | [ .VulnerabilityID, .PkgName, .Severity, .InstalledVersion, .FixedVersion ] | @tsv' <<<"${osVulns}")"
+
+  if [ "${osVulnsFound}" == "false" ]; then
+    echo "    [INFO] No vulnerabilities found."
+    echo "No vulnerabilities found." >>/tmp/report.md
+  fi
+
+  # Go vulnerabilities
+  echo "  [INFO] Checking for Go vulnerabilities"
+  echo "### Go vulnerabilities" >>/tmp/report.md
+  entrypoint="$(crane config "${image}" | jq -r '.config.Entrypoint[0]')"
+  crane export "${image}" - | tar -xf - -C /tmp "${entrypoint}"
+  goVulns="$(govulncheck -format json -mode binary "/tmp${entrypoint}")"
+  goVulnsFound=false
+  while read -r id pkg vulnerableVersion fixedVersion; do
+    if [ "${id}" == "" ]; then
+      continue
+    fi
+
+    if [ "${goVulnsFound}" == "false" ]; then
+      echo "| Vulnerability | Package | Version |" >>/tmp/report.md
+      echo "| -- | -- | -- |" >>/tmp/report.md
+      goVulnsFound=true
+      hasVulnerabilities=true
+    fi
+
+    echo "    [INFO] Found ${id} in ${pkg}. Requires upgrade from ${vulnerableVersion} to ${fixedVersion}."
+    echo "| ${id} | ${pkg} | ${vulnerableVersion} -> ${fixedVersion} |" >>/tmp/report.md
+  done <<<"$(jq --raw-output 'select(.finding != null and .finding.fixed_version != null) | [ .finding.osv, .finding.trace[0].module, .finding.trace[0].version, .finding.fixed_version ] | @tsv' <<<"${goVulns}" | sort -u)"
+
+  if [ "${goVulnsFound}" == "false" ]; then
+    echo "    [INFO] No vulnerabilities found."
+    echo "No vulnerabilities found." >>/tmp/report.md
+  fi
+done
+
+# check if issue exists, if yes, update description, otherwise create one, or close it if vulnerabilities are gone
+issues="$(gh issue list --label release-vulnerabilities --json number)"
+
+if [ "$(jq length <<<"${issues}")" == "0" ]; then
+  if [ "${hasVulnerabilities}" == "true" ]; then
+    # create new issue
+    echo "[INFO] Creating new issue"
+    gh issue create --label release-vulnerabilities --title "Vulnerabilities found in latest release" --body-file /tmp/report.md
+  fi
+else
+  issueNumber="$(jq '.[0].number' <<<"${issues}")"
+  if [ "${hasVulnerabilities}" == "true" ]; then
+    # update issue
+    echo "[INFO] Updating existing issue ${issueNumber}"
+    gh issue edit "${issueNumber}" --body-file /tmp/report.md
+  else
+    gh issue close --reason "No vulnerabilities found in the latest release"
+  fi
+fi

.github/workflows/report-release-vulnerabilities.yaml

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+---
+# This workflow downloads the latest release and checks it for OS and Go vulnerabilities.
+# An issue is opened with a summary    
+name: Report release vulnerabilities
+on:
+  schedule:
+    - cron: '0 0 * * *'
+jobs:
+  report-vulnerabilities:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.22.x'
+          cache: true
+          check-latest: true
+      - name: Install Trivy
+        run: make install-trivy
+      - name: Install govulncheck
+        run: go install golang.org/x/vuln/cmd/govulncheck@latest
+      - name: Run vulnerability check
+        run: ./.github/report-release-vulnerabilities.sh