Allowed Namespace Registries

Type: Rule
ID: k8s-namespace-allowed-registries
Source: v2/rules/k8s/namespace/allowed-registries.yaml
Rego Source: allowed-registries.rego
Labels: K8s, Namespace

Verify container images in Kubernetes namespaces originate from registries in the Allowed List.

note

This rule requires K8s Namespace Discovery Evidence. See here for more details.

tip

Signed Evidence for this rule IS NOT required by default but is recommended.

warning

Rule requires evaluation with a target. Without one, it will be disabled unless the --all-evidence flag is provided.

Usage example

uses: k8s/namespace/allowed-registries@v2
with:
  allowed_registries:
    - docker.io/*
    - gcr.io/*

Mitigation

Ensures that only approved container registries are used within the Kubernetes namespace, reducing the risk of introducing vulnerabilities or unapproved software.

Description

This rule ensures that only container images from specified registries are allowed within the Kubernetes namespace. It performs the following steps:

1. Iterates over the container images running in the namespace.
2. Checks each image's registry against the allowed registries specified in the with.allowed_registries configuration.
   • If an image's registry is not in the allowed list, the rule flags it as a violation.

Evidence Requirements:

• Evidence must be provided by the Scribe Platform's CLI tool through scanning Kubernetes resources.

Evidence Requirements

Field	Value
signed	False
content_body_type	generic
target_type	data
predicate_type	http://scribesecurity.com/evidence/discovery/v0.1
labels	- asset_type=namespace - platform=k8s

Input Definitions

Parameter	Type	Required	Description
allowed_registries	array	False	A list of allowed container registries Regex patterns.