cis-ocp-v170-1.2.7

DevOps & Security

Ensure that the --authorization-mode argument is not set to AlwaysAllow (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 1.2.7

Profile Applicability

Level: 1

Description

Do not always authorize all requests.

Rationale

The API Server, can be configured to allow all requests. This mode should not be used on any production cluster.

Impact

Only authorized requests will be served.

Audit Procedure

It is not possible to configure an OpenShift cluster to allow all requests. OpenShift is configured at bootstrap time to use RBAC to authorize requests. Role-based access control (RBAC) objects determine what actions a user is allowed to perform on what objects in an OpenShift cluster. Cluster administrators manage RBAC for the cluster. Project owners can manage RBAC for their individual OpenShift projects. The OpenShift API server configmap does not use the authorization-mode flag.

To verify, run the following commands:

$ oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq '.apiServerArguments."authorization-mode"'
[
  "Scope",
  "SystemMasters",
  "RBAC",
  "Node"
]

Remediation

None. RBAC is always on and the OpenShift API server does not use the values assigned to the flag authorization-mode.

Default Value

OpenShift uses RBAC by default.

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists	*	*	*
v7	9.2 Ensure Only Approved Ports, Protocols and Services Are Running		*	*

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1133	TA0001	M1026

Profile

Level 1 (Manual)