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Grouping rules#

Abstract

Labels are additional metadata that can be used to classify rules. Together with tags they can be used to group or filter rules.

Using labels#

When defining a rule you can specify labels to classify or link rules using a framework or standard. A single rule can be can linked to multiple labels. For example:

  • The Azure Well-Architected Framework (WAF) defines pillars such as Security and Reliability.
  • The CIS Benchmarks define a number of control IDs such as 3.12 and 13.4.

To specify labels in YAML, use the labels property:

---
# Synopsis: A rule with labels defined.
apiVersion: github.com/microsoft/PSRule/v1
kind: Rule
metadata:
  name: WithLabels
  labels:
    Azure.WAF/pillar: Security
    Azure.ASB.v3/control: [ 'ID-1', 'ID-2' ]
spec: { }

To specify labels in JSON, use the labels property:

{
  // Synopsis: A rule with labels defined.
  "apiVersion": "github.com/microsoft/PSRule/v1",
  "kind": "Rule",
  "metadata": {
    "name": "WithLabels",
    "labels": {
      "Azure.WAF/pillar": "Security",
      "Azure.ASB.v3/control": [ "ID-1", "ID-2" ]
    }
  },
  "spec": { }
}

To specify labels in PowerShell, use the -Labels parameter:

# Synopsis: A rule with labels defined.
Rule 'WithLabels' -Labels @{ 'Azure.WAF/pillar' = 'Security'; 'Azure.ASB.v3/control' = @('ID-1', 'ID-2') } {
    # Define conditions here
}

Filtering with labels#

A reason for assigning labels to rules is to perform filtering of rules to a specific subset. This can be accomplished using baselines and the spec.rule.labels property. For example:

---
# Synopsis: A baseline which returns only security rules.
apiVersion: github.com/microsoft/PSRule/v1
kind: Baseline
metadata:
  name: TestBaseline6
spec:
  rule:
    labels:
      Azure.WAF/pillar: [ 'Security' ]

---
# Synopsis: A baseline which returns any rules that are classified to Azure.WAF/pillar.
apiVersion: github.com/microsoft/PSRule/v1
kind: Baseline
metadata:
  name: TestBaseline6
spec:
  rule:
    labels:
      Azure.WAF/pillar: '*'

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