PT-BR Version: Here

Runtime Image Scanner

This docker image scanner scans the entire kubernetes cluster looking for pods, performing a vulnerability scan on images.

The result of the scans is provided by the trivy and is converted to the Prometheus format.

How it Works

When the software starts, it performs a "setup", which creates the necessary directories for operation;

After that, the http server is started, but without information (/metrics response nothing).

Afterwards, the scan threads are started. As the internal queue objects are consumed, the results are stored in memory for the following steps (generation of prometheus points and finding out if the pod is available on the internet via ingress).

The final step is to perform a cleanup that removes all temporary files generated by trivy.

After all, the script "sleeps" (but the http endpoints continue to work), waiting for its next execution.

Identification of pods exposed on the internet

After executing the scans, when consolidating the scans, a query is made on all entries in the cluster.

In ingress, it contains the service that that path is associated with;

With the service, we find out which selector was used to create the endpoint (referring to that service);

Reading the endpoint, we have information about which pods are part of that endpoint.

When the pod is found at the endpoints, a mark is made: isPublic: true

Registry with authentication

When a pod has in its specification the entry `` yaml imagePullSecrets:

• name: secret `` The script reads the specified secret and looks for the key .dockerconfigjson. If not found, an error is reported and the scanning for that image does not happen. If you don't find the secret, that image will not be scanned either.

Metric exported to Prometheus

Metric name	Metric type	Labels / tags
pod_security_issue	Gauge	PodName = pod-name; Namespace = pod-namespace Image = Docker image with tag IsPublic = Is exposed on ingress? BaseOS = SO Base of image VulnerabilityID = CVE ID PkgName = Vulnerable package name InstalledVersion = Vulnerable package version FixedVersion = Corrected package version Severity = CVE severity

Environment variables

All parameters of this scanner are adjustable via environment variables.

Variable	Default Value	Required	Description
LOG_LEVEL	info	no	App log level. Supported values: info, warning, debug, fatal, critical.
TRIVY_REPORT_DIR	/tmp/trivyreport	no	Temporary location where trivy reports will be saved
SCAN_INTERVAL	43200	no	Time in seconds of the execution interval
HTTP_PORT	8080	no	Port where the endpoint will listen
TRIVY_BIN_PATH	./trivy	no	trivy binary path

Performing unit tests

Test coverage:

make tests

Generating a new version

The production build is done in Google Build

By creating a new tag, this will sensitize a new build. (the trigger is v. +)

Makefile uses the bumpversion utility to create the tags and push to the git repo.

Make Option	Action
patch	Generates a patch version (X.Y. ** Z **).
minor	Generates a minor version (X. ** Y **. Z).
major	Ger a major version (** X **. Y.Z).
build-dev	local build

Known errors

• Scan of images hosted on quay.io. Quay does not support the registry api v2 so it is not possible to scan these images.

  This error can happen with any other registry that does not implement api v2.

  See more about this error at: google/go-containerregistry#377