docker/scan-scripts/scan-image.sh

#!/usr/bin/env bash
# =============================================================================
# Container Security Scan Pipeline — Trivy + Grype + Dockle
# =============================================================================
set -euo pipefail

IMAGE="${1:?Usage: $0 <image>}"
REPORT_DIR="${REPORT_DIR:-./scan-reports}"
SEVERITY="${SEVERITY:-CRITICAL,HIGH}"
EXIT_ON_CRITICAL="${EXIT_ON_CRITICAL:-true}"

mkdir -p "${REPORT_DIR}"

echo "=== Scanning ${IMAGE} ==="

# --- Trivy: Vulnerability Scan ---
echo "[1/4] Trivy vulnerability scan..."
trivy image \
  --severity "${SEVERITY}" \
  --format json \
  --output "${REPORT_DIR}/trivy-vuln.json" \
  --exit-code 0 \
  "${IMAGE}"

trivy image \
  --severity "${SEVERITY}" \
  --format table \
  "${IMAGE}"

# --- Trivy: Misconfiguration Scan ---
echo "[2/4] Trivy misconfig scan..."
trivy config \
  --severity "${SEVERITY}" \
  --format json \
  --output "${REPORT_DIR}/trivy-misconf.json" \
  .

# --- Trivy: Secret Scan ---
echo "[3/4] Trivy secret scan..."
trivy fs \
  --scanners secret \
  --format json \
  --output "${REPORT_DIR}/trivy-secrets.json" \
  .

# --- Trivy: SBOM Generation ---
echo "[4/4] Generating SBOM..."
trivy image \
  --format spdx-json \
  --output "${REPORT_DIR}/sbom.spdx.json" \
  "${IMAGE}"

# --- Check for Critical CVEs ---
CRITICAL_COUNT=$(jq '[.Results[]?.Vulnerabilities[]? | select(.Severity == "CRITICAL")] | length' "${REPORT_DIR}/trivy-vuln.json")
echo "Critical vulnerabilities: ${CRITICAL_COUNT}"

if [[ "${EXIT_ON_CRITICAL}" == "true" && "${CRITICAL_COUNT}" -gt 0 ]]; then
  echo "FAIL: Critical vulnerabilities found — blocking deployment"
  exit 1
fi

echo "=== Scan complete ==="