policy-falco-auditing.yaml

# This policy enables forwarding audit events from the OpenShift kubernetes API
# server to a webserver (this is intended to send to a falco agent).
# Note that this makes changes to the kubernetes api server
# that are unsupported so review the implications of this policy before using it.
#
# SETUP: Perform each of these steps to setup this policy for your environment.
# 1. Set remediationAction to "enforce" to configure audit log forwarding.
# 2. Change the placement rule and the namespace selector to match where falco is deployed
#    This is only usable on OpenShift 4.x clusters with falco.
# 3. Update the base64 encoded file contents in the MachineConfig object.  The procedure
#    to complete this is:
#    - Run: echo '<encoded-value>' | base64 --decode > webhook-config.yaml
#    - Edit the file webhook-config.yaml and change the URL so the hostname api.cluster.dev.mydomain.com
#      matches the hostname returned by: oc cluster-info
#    - Re-encode the file: cat webhook-config.yaml | base64
#    - Update the policy with this new encoded value.
#    - Recognize this must be done separately for each cluster you want to configure falco audit
#      processing on. This is not required for processing falco rules, it is only needed on 
#      OpenShift clusters where you want to process the falco auditing rules.

apiVersion: policy.open-cluster-management.io/v1
kind: Policy
metadata:
  name: policy-falco-auditing
  annotations:
    policy.open-cluster-management.io/standards: NIST 800-53
    policy.open-cluster-management.io/categories: CM Configuration Management
    policy.open-cluster-management.io/controls: CM-2 Baseline Configuration
spec:
  remediationAction: inform
  disabled: false
  policy-templates:
    - objectDefinition:
        apiVersion: policy.open-cluster-management.io/v1
        kind: ConfigurationPolicy
        metadata:
          name: policy-falco-auditing
        spec:
          remediationAction: inform # will be overridden by remediationAction in parent policy
          severity: low
          namespaceSelector:
            include:
              - "falco"
          object-templates:
            - complianceType: musthave
              objectDefinition:
                apiVersion: machineconfiguration.openshift.io/v1
                kind: MachineConfig
                metadata:
                  labels:
                    machineconfiguration.openshift.io/role: master
                  name: masters-audit-configuration
                spec:
                  config:
                    ignition:
                      version: 3.2.0
                    storage:
                      files:
                      - contents:
                          source: data:text/plain;charset=utf-8;base64,YXBpVmVyc2lvbjogdjEKa2luZDogQ29uZmlnCmNsdXN0ZXJzOgotIG5hbWU6IGZhbGNvCiAgY2x1c3RlcjoKICAgICMgY2VydGlmaWNhdGUtYXV0aG9yaXR5OiAvcGF0aC90by9jYS5jcnQgIyBmb3IgaHR0cHMKICAgIHNlcnZlcjogaHR0cDovL2FwaS5jbHVzdGVyLmRldi5teWRvbWFpbi5jb206MzI3NjUvazhzLWF1ZGl0CmNvbnRleHRzOgotIGNvbnRleHQ6CiAgICBjbHVzdGVyOiBmYWxjbwogICAgdXNlcjogIiIKICBuYW1lOiBkZWZhdWx0LWNvbnRleHQKY3VycmVudC1jb250ZXh0OiBkZWZhdWx0LWNvbnRleHQKcHJlZmVyZW5jZXM6IHt9CnVzZXJzOiBbXQo=
                        filesystem: root
                        mode: 384
                        path: /var/log/kube-apiserver/webhook-config.yaml
    - objectDefinition:
        apiVersion: policy.open-cluster-management.io/v1
        kind: ConfigurationPolicy
        metadata:
          name: policy-falco-auditing-k8sapiserver
        spec:
          remediationAction: inform # will be overridden by remediationAction in parent policy
          severity: low
          object-templates:
            - complianceType: musthave
              objectDefinition:
                apiVersion: operator.openshift.io/v1
                kind: KubeAPIServer
                metadata:
                  name: cluster
                spec:
                  unsupportedConfigOverrides:
                    apiServerArguments:
                      audit-webhook-config-file:
                      - /var/log/kube-apiserver/webhook-config.yaml
---
apiVersion: policy.open-cluster-management.io/v1
kind: PlacementBinding
metadata:
  name: binding-policy-falco-auditing
placementRef:
  name: placement-policy-falco-auditing
  kind: PlacementRule
  apiGroup: apps.open-cluster-management.io
subjects:
- name: policy-falco-auditing
  kind: Policy
  apiGroup: policy.open-cluster-management.io
---
apiVersion: apps.open-cluster-management.io/v1
kind: PlacementRule
metadata:
  name: placement-policy-falco-auditing
spec:
  clusterConditions:
  - status: "True"
    type: ManagedClusterConditionAvailable
  clusterSelector:
    matchExpressions:
      - {key: environment, operator: In, values: ["dev"]}