Container Image Mapping

Introduction

The container image policy mapping editor creates rules that define which policies and allowlists should be used to perform the policy evaluation of an image based on the registry, repository name, and tag of the image.

Create a new Image Container Mapping

  1. From the Policy Bundles screen, click Mappings.

  2. Click Add New Mapping, then select Container Images to create the mapping from a container image.

    alt text

  3. From the Add New Container Image Mapping dialog, add a name for the mapping, the policy for which the mapping will apply (added automatically), a registry, a repository, and a tag. You can optionally add an allowlist and set the position for the mapping.

    alt text

  4. Using the policy editor, you can set up different policies that will be used on different images based on use case. For example the policy applied to a web facing service may have different security and operational best practices rules than a database backend service.

    Mappings are set up based on the registry, repository, and tag of an image. Each field supports wildcards. For example:

Field Example Description
Registry registry.example.com Apply mapping to the registry.example.com
Repository anchore/web\* Map any repository starting with web in the anchore namespace
Tag * Map any tag

In this example, an imaged named registry.example.com/anchore/webapi:latest would match this mapping, so the policy and allowlist configured for this mapping would be applied.

The mappings are applied in order, from top to bottom and the system will stop at the first match.

Note: The allowed images and denied images lists take precedence over the mapping. See Allowed / Denied Images for details.

  1. The empty policy bundle includes no mappings. Click Let’s add one! to add your first mapping.

  2. From Add a New Container Image Mapping, fill in the mandatory fields for Name, Policy, Registry, Repository and Tag. The Allowlists and Position fields are optional. See the following table for more information about these fields.

alt text

Field Description
Name A unique name to describe the mapping. For example: “Mapping for webapps”.
Position Set the order for the new mapping.
Policies Name of policy to use for evaluation. A drop down will be displayed allowing selection of a single policy.
Allowlist(s) Optional: The allowlist(s) to be applied to the image evaluation. Multiple allowlists may be applied to the same image.
Registry The name of the registry to match. Note the name should exactly match the name used to submit the image or repo for analysis. For example: foo.example.com:5000 is different to foo.example.com. Wildcards are supported. A single * would specify any registry.
Repository The name of the repository, optionally including namespace. For example: webapp/foo. Wildcards are supported. A single * would specify any repository. Partial names with wildcards are supported. For example: web*/*.
Tag Tags mapped by this rule. For example: latest. Wildcard are supported. A single * would match any tag. Partial names with wildcards are supported. For example: 2018*.

Each entry field includes an indicator showing if the current entry is valid alt text or has errors alt text.

Image evaluation is performed sequentially from top to bottom. The system will stop at the first match, so particular care should be paid to the ordering.

Mappings can be reordered using the alt text buttons which will move a mapping up or down the list. Mappings may be deleted using the alt text button.

It is recommended that a final catch-all mapping is applied to ensure that all container images are mapped to a policy. This catch-all mapping should specify wildcards in the registry, repository, and tag fields.

Last modified March 15, 2022