Air-Gapped Environment
Trivy can be used in air-gapped environments. Note that an allowlist is here.
Air-Gapped Environment for vulnerabilities
Download the vulnerability database
TRIVY_TEMP_DIR=$(mktemp -d)
trivy --cache-dir $TRIVY_TEMP_DIR image --download-db-only
tar -cf ./db.tar.gz -C $TRIVY_TEMP_DIR/db metadata.json trivy.db
rm -rf $TRIVY_TEMP_DIR
At first, you need to download the vulnerability database for use in air-gapped environments. Please follow oras installation instruction.
Download db.tar.gz:
$ oras pull ghcr.io/aquasecurity/trivy-db:2
At first, you need to download the vulnerability database for use in air-gapped environments. Please follow oras installation instruction.
Download db.tar.gz:
$ oras pull -a ghcr.io/aquasecurity/trivy-db:2
Transfer the DB file into the air-gapped environment
The way of transfer depends on the environment.
$ rsync -av -e ssh /path/to/db.tar.gz [user]@[host]:dst
Put the DB file in Trivy's cache directory
You have to know where to put the DB file. The following command shows the default cache directory.
$ ssh user@host
$ trivy -h | grep cache
--cache-dir value cache directory (default: "/home/myuser/.cache/trivy") [$TRIVY_CACHE_DIR]
Put the DB file in the cache directory + /db.
$ mkdir -p /home/myuser/.cache/trivy/db
$ cd /home/myuser/.cache/trivy/db
$ tar xvf /path/to/db.tar.gz -C /home/myuser/.cache/trivy/db
x trivy.db
x metadata.json
$ rm /path/to/db.tar.gz
In an air-gapped environment it is your responsibility to update the Trivy database on a regular basis, so that the scanner can detect recently-identified vulnerabilities.
Run Trivy with --skip-update and --offline-scan option
In an air-gapped environment, specify --skip-update so that Trivy doesn't attempt to download the latest database file.
In addition, if you want to scan Java dependencies such as JAR and pom.xml, you need to specify --offline-scan since Trivy tries to issue API requests for scanning Java applications by default.
$ trivy image --skip-update --offline-scan alpine:3.12
Air-Gapped Environment for misconfigurations
No special measures are required to detect misconfigurations in an air-gapped environment.
Run Trivy with --skip-policy-update option
In an air-gapped environment, specify --skip-policy-update so that Trivy doesn't attempt to download the latest misconfiguration policies.
$ trivy conf --skip-policy-update /path/to/conf