Skip to content

Latest commit

 

History

History
739 lines (597 loc) · 25.7 KB

usage.md

File metadata and controls

739 lines (597 loc) · 25.7 KB
Raw

Usage Guide

Before starting to use the operator, it's worth checking the descriptions of the different custom resources it introduces. These definitions are in the following document. The primary interface for the compliance-operator is the ComplianceSuite object, representing a set of scans. The ComplianceSuite can be defined either manually or with the help of ScanSetting and ScanSettingBinding objects. Note that while it is possible to use the lower-level ComplianceScan directly as well, it is not recommended.

As part of this guide, it's assumed that you have installed the compliance operator in the openshift-compliance namespace. You can find more information about installation methods and directions in the Installation Guide.

After you've installed the operator, set the NAMESPACE environment to the namespace you installed the operator. By default, the operator is installed in the openshift-compliance namespace.

export NAMESPACE=openshift-compliance

Listing profiles

There are several profiles that come out-of-the-box as part of the operator installation.

To view them, use the following command:

$ oc get -n $NAMESPACE profiles.compliance
NAME              AGE
ocp4-cis          2m50s
ocp4-cis-node     2m50s
ocp4-e8           2m50s
ocp4-moderate     2m50s
rhcos4-e8         2m46s
rhcos4-moderate   2m46s

Scan types

These profiles define different compliance benchmarks and as well as the scans fall into two basic categories - platform and node. The platform scans are targeting the cluster itself, in the listing above they're the ocp4-* scans, while the purpose of the node scans is to scan the actual cluster nodes. All the rhcos4-* profiles above can be used to create node scans.

Before taking one into use, we'll need to configure how the scans will run. We can do this with the ScanSettings custom resource. The compliance-operator already ships with a default ScanSettings object that you can take into use immediately:

$ oc get -n $NAMESPACE scansettings default -o yaml
apiVersion: compliance.openshift.io/v1alpha1
kind: ScanSetting
metadata:
  name: default
  namespace: openshift-compliance
rawResultStorage:
  rotation: 3
  size: 1Gi
roles:
- worker
- master
scanTolerations:
- effect: NoSchedule
  key: node-role.kubernetes.io/master
  operator: Exists
schedule: '0 1 * * *'

So, to assert the intent of complying with the rhcos4-moderate profile, we can use the ScanSettingBinding custom resource. The example that already exists in this repo will do just this.

$ cat deploy/crds/compliance.openshift.io_v1alpha1_scansettingbinding_cr.yaml
apiVersion: compliance.openshift.io/v1alpha1
kind: ScanSettingBinding
metadata:
  name: nist-moderate
profiles:
  - name: ocp4-moderate
    kind: Profile
    apiGroup: compliance.openshift.io/v1alpha1
settingsRef:
  name: default
  kind: ScanSetting
  apiGroup: compliance.openshift.io/v1alpha1

To take it into use, do the following:

$ oc create -n $NAMESPACE -f deploy/crds/compliance.openshift.io_v1alpha1_scansettingbinding_cr.yaml
scansettingbinding.compliance.openshift.io/nist-moderate created

At this point the operator reconciles a ComplianceSuite custom resource, we can use this to track the progress of our scan.

$ oc get -n $NAMESPACE compliancesuites -w
NAME            PHASE     RESULT
nist-moderate   RUNNING   NOT-AVAILABLE

You can also make use of conditions to wait for a suite to produce results:

$ oc wait --for=condition=ready compliancesuite cis-compliancesuite

This subsequently creates the ComplianceScan objects for the suite. The ComplianceScan then creates scan pods that run on each node in the cluster. The scan pods execute openscap-chroot on every node and eventually report the results. The scan takes several minutes to complete.

If you're interested in seeing the individual pods, you can do so with:

$ oc get -n $NAMESPACE pods -w

When the scan is done, the operator changes the state of the ComplianceSuite object to "Done" and all the pods are transition to the "Completed" state. You can then check the ComplianceRemediations that were found with:

$ oc get -n $NAMESPACE complianceremediations
NAME                                                             STATE
workers-scan-auditd-name-format                                  NotApplied
workers-scan-coredump-disable-backtraces                         NotApplied
workers-scan-coredump-disable-storage                            NotApplied
workers-scan-disable-ctrlaltdel-burstaction                      NotApplied
workers-scan-disable-users-coredumps                             NotApplied
workers-scan-grub2-audit-argument                                NotApplied
workers-scan-grub2-audit-backlog-limit-argument                  NotApplied
workers-scan-grub2-page-poison-argument                          NotApplied

To apply a remediation, edit that object and set its Apply attribute to true:

$ oc edit -n $NAMESPACE complianceremediation/workers-scan-no-direct-root-logins

The operator then creates a MachineConfig or KubeletConfig object per remediation. This object is rendered to a MachinePool and the MachineConfigDaemon running on nodes in that pool pushes the configuration to the nodes and reboots the nodes.

The more documentation on how KubeletConfig remediation work following document

You can watch the node status with:

$ oc get nodes -w

Once the nodes reboot, you might want to run another Suite to ensure that the remediation that you applied previously was no longer found.

Evaluating rules against default configuration values

Kubernetes infrastructure may contain incomplete configuration files. At run time, nodes will assume default configuration values for missing configuration options. And some configuration can be passed as command line arguments, therefore, the Compliance Operator cannot assume the configuration file on the node is complete and it may be missing options used in rule checks.

To prevent false negative findings where the default configuration value passes a check, the Compliance Operator uses the node proxy API to fetch the configuration for each node, then evaluates the properties for each and stores a "consistent" copy to be evaluated against the rules. This increases the accuracy of the scan results.

The enchantment documentation can be found in the following document

No additional changes are required to use this feature with master and worker node pools. See the following sections for details on how to use this feature with custom node pools.

Custom node pools

For scalability reasons, the Compliance Operator doesn't persist a copy of each node configuration. Instead, it aggregates consistent configuration options for all nodes within a single node pool into one copy of the configuration file. It then uses the configuration file for a particular node pool to evaluate rules against nodes within that pool.

If your cluster uses custom node pools outside the default worker and master node pools, you'll need to supply additional variables to ensure the Compliance Operator aggregates a configuration file for that node pool.

For example, in a cluster that has master, worker and infra pools, If a user wants to check against all pools, they need to set the value of ocp-var-role-master and ocp-var-role-worker to infra in TailoredProfile:

apiVersion: compliance.openshift.io/v1alpha1
kind: TailoredProfile
metadata:
  name: cis-infra-tp
spec:
  extends: ocp4-cis
  title: My modified nist profile with a custom value
  setValues:
  - name: ocp4-var-role-master
    value: infra
    rationale: test for infra nodes
  - name: ocp4-var-role-worker
    value: infra
    rationale: test for infra nodes
  description: cis-infra-scan

User will need to add infra role to the ScanSetting that will be in the `ScanSettingBinding.

apiVersion: compliance.openshift.io/v1alpha1
kind: ScanSetting
metadata:
  name: default
  namespace: openshift-compliance
rawResultStorage:
  rotation: 3
  size: 1Gi
roles:
- worker
- master
- infra
scanTolerations:
- effect: NoSchedule
  key: node-role.kubernetes.io/master
  operator: Exists
schedule: '0 1 * * *'

And launch a scan using ScanSettingBinding:

apiVersion: compliance.openshift.io/v1alpha1
kind: ScanSettingBinding
metadata:
  name: cis
  namespace: openshift-compliance
profiles:
- apiGroup: compliance.openshift.io/v1alpha1
  kind: Profile
  name: ocp4-cis
- apiGroup: compliance.openshift.io/v1alpha1
  kind: Profile
  name: ocp4-cis-node
- apiGroup: compliance.openshift.io/v1alpha1
  kind: TailoredProfile
  name: cis-infra-tp
settingsRef:
  apiGroup: compliance.openshift.io/v1alpha1
  kind: ScanSetting
  name: default

KubeletConfig Remediation on sub-pools

If a user wants to use KubeletConfig remediation on sub-pools Remediation for Customized MachineConfigPool, they need to add a label to the sub-pool MachineConfigPool:

$ oc label mcp <sub-pool-name> pools.operator.machineconfiguration.openshift.io/<sub-pool-name>=

How does it work?

To give an example on the CIS benchmark: Compliance Operator checks runtime KubeletConfig through Kubernetes Node/Proxy object, and it uses variables ocp-var-role-master and ocp-var-role-master to determine the nodes it performs the check against. And in ComplianceCheckResult, KubeletConfig rules will be shown as ocp4-cis-kubelet-*. The scan only passes if all selected nodes pass the check.

List of KubeletConfig rules checked through Node/Proxy object:

A user can find out if a rule is checked through Node/Proxy object by checking if valuesUsed of the ComplianceCheckResult contains ocp4-var-role-master or ocp4-var-role-worker:

oc get ccr -n openshift-compliance -o yaml | jq '.items[] | select(.valuesUsed | contains("ocp4-var-role-master") or contains("ocp4-var-role-worker"))'

Suspending and resuming scan schedules

The ScanSetting CRD exposes a schedule attribute that allows you to schedule compliance scans as a cron job syntax. The Compliance Operator uses Kubernetes CronJob resources to implement the schedule for a scan suite, which is sometimes referred to as a suite rerunner.

Scan schedules are associated with a ComplianceSuite, which may contain at least one ComplianceScan. This means the schedule associated with a ComplianceSuite applies to all ComplianceScan objects within that suite. This may be useful to prevent scans from happening during planned maintenance windows, where results might be inaccurate depending on the state of the cluster.

You can suspend a ComplianceSuite by updating the ScanSetting you used when you created the ScanSettingBinding.

$ oc patch ss/default -p 'suspend: true' --type merge

Any ScanSettingBinding using the suspended ScanSetting will show a SUSPENDED status:

$ oc get ssb
NAME       STATUS
cis-node   SUSPENDED

You can disable the suspend attribute to resume the scan schedule:

$ oc patch ss/default -p 'suspend: false' --type merge

The ScanSettingBinding will return to a READY state:

$ oc get ssb
NAME       STATUS
cis-node   READY

Note that this functionality does not pause, suspend, or stop a scan that is already in progress.

Extracting raw results

The scans provide two kinds of raw results: the full report in the ARF format and just the list of scan results in the XCCDF format. The ARF reports are, due to their large size, copied into persistent volumes:

$ oc get pv
NAME                                       CAPACITY  CLAIM
pvc-5d49c852-03a6-4bcd-838b-c7225307c4bb   1Gi       openshift-compliance/workers-scan
pvc-ef68c834-bb6e-4644-926a-8b7a4a180999   1Gi       openshift-compliance/masters-scan
$ oc get pvc
NAME                     STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
ocp4-moderate            Bound    pvc-01b7bd30-0d19-4fbc-8989-bad61d9384d9   1Gi        RWO            gp2            37m
rhcos4-with-usb-master   Bound    pvc-f3f35712-6c3f-42f0-a89a-af9e6f54a0d4   1Gi        RWO            gp2            37m
rhcos4-with-usb-worker   Bound    pvc-7837e9ba-db13-40c4-8eee-a2d1beb0ada7   1Gi        RWO            gp2            37m

An example of extracting ARF results from a scan called workers-scan follows:

Once the scan had finished, you'll note that there is a PersistentVolumeClaim named after the scan:

oc get pvc/workers-scan
NAME            STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
workers-scan    Bound    pvc-01b7bd30-0d19-4fbc-8989-bad61d9384d9   1Gi        RWO            gp2            38m

You'll want to start a pod that mounts the PV, for example:

apiVersion: "v1"
kind: Pod
metadata:
  name: pv-extract
spec:
  containers:
    - name: pv-extract-pod
      image: registry.access.redhat.com/ubi8/ubi
      command: ["sleep", "3000"]
      volumeMounts:
        - mountPath: "/workers-scan-results"
          name: workers-scan-vol
  volumes:
    - name: workers-scan-vol
      persistentVolumeClaim:
        claimName: workers-scan

You can inspect the files by listing the /workers-scan-results directory and copy the files locally:

$ oc exec pods/pv-extract -- ls /workers-scan-results/0
lost+found
workers-scan-ip-10-0-129-252.ec2.internal-pod.xml.bzip2
workers-scan-ip-10-0-149-70.ec2.internal-pod.xml.bzip2
workers-scan-ip-10-0-172-30.ec2.internal-pod.xml.bzip2
$ oc cp pv-extract:/workers-scan-results .

The files are bzipped. To get the raw ARF file:

$ bunzip2 -c workers-scan-ip-10-0-129-252.ec2.internal-pod.xml.bzip2 > workers-scan-ip-10-0-129-252.ec2.internal-pod.xml

The XCCDF results are much smaller and can be stored in a configmap, from which you can extract the results. For easier filtering, the configmaps are labeled with the scan name:

$ oc get cm -l=compliance.openshift.io/scan-name=masters-scan
NAME                                            DATA   AGE
masters-scan-ip-10-0-129-248.ec2.internal-pod   1      25m
masters-scan-ip-10-0-144-54.ec2.internal-pod    1      24m
masters-scan-ip-10-0-174-253.ec2.internal-pod   1      25m

To extract the results, use:

$ oc extract cm/masters-scan-ip-10-0-174-253.ec2.internal-pod

Note that if the results are too big for the ConfigMap, they'll be bzipped and base64 encoded.

Operating system support

Node scans

Note that the current testing has been done in RHCOS. In the absence of RHEL/CentOS support, one can simply run OpenSCAP directly on the nodes.

Platform scans

Current testing has been done on OpenShift (OCP). The project is open to getting other platforms tested, so volunteers are needed for this.

The current supported versions of OpenShift are 4.6 and up.

Additional documentation

See the self-paced workshop for a hands-on tutorial, including advanced topics such as content building.

Must-gather support

An oc adm must-gather image for collecting operator information for debugging or support is available at ghcr.io/complianceascode/must-gather-ocp:latest:

$ oc adm must-gather --image=ghcr.io/complianceascode/must-gather-ocp:latest

Metrics

The compliance-operator exposes the following metrics to Prometheus when cluster-monitoring is available.

# HELP compliance_operator_compliance_remediation_status_total A counter
# for the total number of updates to the status of a ComplianceRemediation
# TYPE compliance_operator_compliance_remediation_status_total counter
compliance_operator_compliance_remediation_status_total{name="remediation-name",state="NotApplied"} 1

# HELP compliance_operator_compliance_scan_status_total A counter for the
# total number of updates to the status of a ComplianceScan
# TYPE compliance_operator_compliance_scan_status_total counter
compliance_operator_compliance_scan_status_total{name="scan-name",phase="AGGREGATING",result="NOT-AVAILABLE"} 1

# HELP compliance_operator_compliance_scan_error_total A counter for the
# total number errors
# TYPE compliance_operator_compliance_scan_error_total counter
compliance_operator_compliance_scan_error_total{name="scan-name",error="some_error"} 1

# HELP compliance_operator_compliance_state A gauge for the compliance
# state of a ComplianceSuite. Set to 0 when COMPLIANT, 1 when NON-COMPLIANT,
# 2 when INCONSISTENT, and 3 when ERROR
# TYPE compliance_operator_compliance_state gauge
compliance_operator_compliance_state{name="some-compliance-suite"} 1

After logging into the console, navigating to Monitoring -> Metrics, the compliance_operator* metrics can be queried using the metrics dashboard. The {__name__=~"compliance.*"} query can be used to view the full set of metrics.

Testing for the metrics from the cli can also be done directly with a pod that curls the metrics service. This is useful for troubleshooting.

oc run --rm -i --restart=Never --image=registry.fedoraproject.org/fedora-minimal:latest -n openshift-compliance metrics-test -- bash -c 'curl -ks -H "Authorization: Bea
rer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" https://metrics.openshift-compliance.svc:8585/metrics-co' | grep compliance

To use PriorityClass for scans

When heavily using Pod Priority and Preemption1 for automated scaling and the default PriorityClass is too low to guarantee pods to run then scans are not executed and reports are missing. Since the Compliance Operator is important for ensuring compliance, we should give administrators the ability to associate a PriorityClass with the operator. This will ensure the Compliance Operator is prioritized and minimizes the chance that the cluster will fall out of compliance because the Compliance Operator wasn’t running.

An admin can set PriorityClass1 in ScanSetting, below is an example of a ScanSetting with a PriorityClass:

apiVersion: compliance.openshift.io/v1alpha1
strictNodeScan: true
metadata:
  name: default
  namespace: openshift-compliance
priorityClass: compliance-high-priority
kind: ScanSetting
showNotApplicable: false
rawResultStorage:
  nodeSelector:
    node-role.kubernetes.io/master: ''
  pvAccessModes:
    - ReadWriteOnce
  rotation: 3
  size: 1Gi
  tolerations:
    - effect: NoSchedule
      key: node-role.kubernetes.io/master
      operator: Exists
    - effect: NoExecute
      key: node.kubernetes.io/not-ready
      operator: Exists
      tolerationSeconds: 300
    - effect: NoExecute
      key: node.kubernetes.io/unreachable
      operator: Exists
      tolerationSeconds: 300
    - effect: NoSchedule
      key: node.kubernetes.io/memory-pressure
      operator: Exists
schedule: 0 1 * * *
roles:
  - master
  - worker
scanTolerations:
  - operator: Exists

If the PriorityClass referenced in the ScanSetting can't be found, the operator will leave PriorityClass empty, issue a warning, and continue scheduling scans without a PriorityClass.

Increasing operator's memory or CPU limits

In some cases, the compliance-operator might require more memory than the default limits allow. If the operator had been installed through OLM (which is the case when the operator is installed through the OCP Web Console), the best way is to set custom limits in the Subscription object.

For example, in order to increase the operator's memory limits to 500Mi, create the following patch file:

spec:
  config:
    resources:
      limits:
        memory: 500Mi

and apply it:

$ oc patch sub compliance-operator -nopenshift-compliance --patch-file co-memlimit-patch.yaml --type=merge

Please note that this only sets the limit for the compliance-operator deployment, not the pods actually performing the scan.

To use timeout option for scan

The scan has a timeout option that can be specified in the ComplianceScanSetting object as a duration string (e.g. 1h30m). If the scan does not finish within the specified timeout, it will either be reattempted (up to a maximum of MaxRetryOnTimeout times) or considered a failure, depending on the value of MaxRetryOnTimeout. The timeout can be disabled by setting it to 0s, and the default value is 30m. The default value for MaxRetryOnTimeout is 3, so the timeout scan will be retried up to three times if it fails.

To set a Timeout and MaxRetryOnTimeout in ScanSetting:

apiVersion: compliance.openshift.io/v1alpha1
kind: ScanSetting
metadata:
  name: default
  namespace: openshift-compliance
rawResultStorage:
  rotation: 3
  size: 1Gi
roles:
- worker
- master
scanTolerations:
- effect: NoSchedule
  key: node-role.kubernetes.io/master
  operator: Exists
schedule: '0 1 * * *'
timeout: '10m0s'
maxRetryOnTimeout: 3

Compliance Operator will check the creation timestamp of the Scanner pod age, if it is longer than timeout, we will terminate the scan or retry.

A timeout scan will send a warning on retries, and the scan will have an error result.

How to Use Compliance Operator with HyperShift Management Cluster

Hypershift allows one to create and manage clusters on existing infrastructure. Compliance Operator is able to create a platform scan on the HyperShift Management Cluster for the Hosted Cluster with a TailoredProfile.

Currently, we only support CIS profile and PCI-DSS profile, you can either extend ocp4-cis or ocp4-pci-dss.

In order to scan a Hosted Cluster, you need to create a TailoredProfile specifying the name and namespace of the Hosted Cluster that you want to scan. Set the value of ocp4-hypershift-cluster to the name of the target Hosted Cluster, and set the value of ocp4-hypershift-namespace-prefix to the namespace where the Hosted Cluster resides, e.g.: local-cluster, or clusters.

apiVersion: compliance.openshift.io/v1alpha1
kind: TailoredProfile
metadata:
 name: cis-compliance-hypershift
 namespace: openshift-compliance
 annotations:
   compliance.openshift.io/product-type: Platform
spec:
 title: CIS Benchmark for Hypershift
 description: CIS Benchmark for Hypershift Master-plane components
 extends: ocp4-cis
 setValues:
   - name: ocp4-hypershift-cluster
     value: "<hypershift-hosted-cluster-name>"
     rationale: This value is used for HyperShift version detection
   - name: ocp4-hypershift-namespace-prefix
     value: "<hypershift-hosted-namespace-prefix>"
     rationale: This value is used for HyperShift control plane namespace detection

And after you save the edit, you can then apply the edited tailoredProfile, and create a ScanSettingBinding to run the scan:

apiVersion: compliance.openshift.io/v1alpha1
kind: ScanSettingBinding
metadata:
 name: cis-compliance-hypershift
 namespace: openshift-compliance
profiles:
 - name: cis-compliance-hypershift
   kind: TailoredProfile
   apiGroup: compliance.openshift.io/v1alpha1
settingsRef:
 name: default
 kind: ScanSetting
 apiGroup: compliance.openshift.io/v1alpha1

How to Use Compliance Operator with HyperShift Hosted Cluster

Compliance Operator is able to run a platform scan on the HyperShift Hosted Cluster without any tailoredProfile. Any unsupport rules will be hidden from the ComplianceCheckResult.

However, you need to use a special subscription file to install Compliance Operator on the Hosted Cluster from the OperatorHub. You can either add spec.config section from the following example to the existing subscription object, or use the following subscription file directly:

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: compliance-operator-
  namespace: openshift-compliance
spec:
  channel: stable
  installPlanApproval: Automatic
  name: compliance-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace
  startingCSV: compliance-operator.v1.0.0
  config:
    nodeSelector:
      node-role.kubernetes.io/worker: ""
    env: 
    - name: PLATFORM
      value: "HyperShift"

To install Compliance Operator on the Hosted Cluster from upstream using OLM, you can run the following command:

make catalog-deploy PLATFORM=HyperShift

Verbose OpenScap debugging information

Compliance Operator uses OpenScap under the hood to perform the scans. In order to enable verbose debugging information from OpenScap, you can set the OSCAP_DEBUG_LEVEL environment variable.

Setting the variable depends on your deployment method: if you installed the operator directly from upstream manifests, just add the variable to the main operator deployment (.spec.template.spec.containers[0].env), and then wait for restart of the operator pod.

If the operator was installed through OLM, you can set the variable in the Subscription object, e.g.:

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
  name: compliance-operator-sub
  namespace: openshift-compliance
spec:
  channel: alpha
  name: compliance-operator
  source: compliance-operator
  sourceNamespace: openshift-marketplace
  config:
    nodeSelector:
      node-role.kubernetes.io/worker: ""
    env:
      - name: OSCAP_DEBUG_LEVEL
        value: DEVEL