File 80-vulnerability-scan-trivy of Package post-build-checks-containers.41016

#!/bin/bash
#
# Perform vulnerability scan of a container image built by OBS using Trivy.

# Strict mode
set -euo pipefail

TOPDIR="/usr/src/packages"
#OUTPUTDIR="$TOPDIR/"

# Helper functions
log() {
    echo "$@" >&2
}
check_required_environment_variables() {
    local required_environment_variable
    for required_environment_variable in "$@"; do
        if [[ -z ${!required_environment_variable:-} ]]; then
            log "Missing environment variable '$required_environment_variable'"
            return 1
        fi
    done
}
containerinfos() {
    find "$OUTPUTDIR" -type f -name '*.containerinfo'
}

check_required_environment_variables BUILD_DIR BUILD_ROOT

log "Retrieving container image metadata"
CONTAINERINFO="$(find "$TOPDIR" -name '*.containerinfo' -print -quit)"
OUTPUTDIR=`dirname $CONTAINERINFO`
CONTAINER_NAME="$(basename "$CONTAINERINFO" | sed 's/\.containerinfo$//')"
CONTAINER_TAG="$(python3 -c \
    'import json, sys; print(json.load(sys.stdin)["tags"][0])' \
    <"$CONTAINERINFO")"
log "Container image tag to check: $CONTAINER_TAG"

CONTAINER_UNPACKED_DIR=`mktemp -d`

TRIVY_RESULT="$(mktemp)"
find `dirname $CONTAINER_NAME` -name "*.tar" | while read tarname
do
        echo "tarname is $tarname"

	log "Scanning image $tarname with Trivy"
	trivy image \
	    --cache-dir /usr/share/trivy/cache	\
	    --detection-priority comprehensive	\
	    --format cosign-vuln		\
	    --offline-scan			\
	    --skip-db-update			\
	    --skip-java-db-update		\
	    --output "$TRIVY_RESULT"		\
	    --input $tarname			\
	    "$CONTAINER_UNPACKED_DIR"
done

cat $TRIVY_RESULT

# Convert file to the Cosign Vulnerability Scan Record Attestation Spec format
# https://github.com/sigstore/cosign/blob/main/specs/COSIGN_VULN_ATTESTATION_SPEC.md
# NOTE: The subject will be filled by OBS during publishing
# This command merges the files, avoid --argjson due to error using large files
OUTPUT_FILE="$OUTPUTDIR/$CONTAINER_NAME.trivy_vuln.intoto.json"
jq -s '.[1].predicate = .[0] | .[1]' "$TRIVY_RESULT" - >"$OUTPUT_FILE" <<EOF
{
  "_type": "https://in-toto.io/Statement/v0.1",
  "predicateType": "https://cosign.sigstore.dev/attestation/vuln/v1",
  "subject": [
    {
      "name": "",
      "digest": {
        "sha256": ""
      }
    }
  ],
  "predicate": {}
}
EOF

log "Cleaning up"
rm "$TRIVY_RESULT"