cis-ocp-v160-1.1.10

DevOps & Security

Ensure that the Container Network Interface file ownership is set to root:root (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.6.0 - Control 1.1.10

Profile Applicability

Level: 1

Description

Ensure that the Container Network Interface files have ownership set to root:root.

Rationale

Container Network Interface provides various networking options for overlay networking. You should consult their documentation and restrict their respective file permissions to maintain the integrity of those files. Those files should be owned by root:root.

Impact

None.

Audit Procedure

The Cluster Network Operator (CNO) deploys and manages the cluster network components on an OpenShift Container Platform cluster. This includes the Container Network Interface (CNI) default network provider plug-in selected for the cluster during installation. OpenShift Container Platform uses the Multus CNI plug-in to allow chaining of CNI plug-ins. The default Pod network must be configured during cluster installation. By default, the CNO deploys the OpenShift SDN as the default Pod network. Ensure that the multu and openshift-sdn file ownership is set to root:root and the Open vSwitch (OVS) file ownership is set to openvswitch:openvswitch. The SDN components are deployed as DaemonSets across the master/worker nodes with controllers limited to control plane nodes. OpenShift deploys OVS as a network overlay by default. Various configurations (ConfigMaps and other files managed by the operator via hostpath but stored on the container hosts) are stored in the following locations: CNI: /etc/cni/net.d /host/var/run/multus/cni/net.d SDN: /var/lib/cni/networks/openshift-sdn /var/run/openshift-sdn SDN OVS: /var/run/openvswitch /etc/openvswitch /run/openvswitch

Run the following commands to verify ownership when using CNI multus:

for i in $(oc get pods -n openshift-multus -l app=multus -oname); do  oc exec -n openshift-multus $i --  /bin/bash -c "stat -c \"%U:%G %n\" /host/etc/cni/net.d/*.conf"; done

for i in $(oc get pods -n openshift-multus -l app=multus -oname); do  oc exec -n openshift-multus $i --  /bin/bash -c "stat -c \"%U:%G %n\" /host/var/run/multus/cni/net.d/*.conf"; done

Run the following commands to verify the permissions when using OpenShift SDN:

for i in $(oc get pods -n openshift-sdn -l app=sdn -oname);  do   oc exec -n openshift-sdn $i --   find /var/lib/cni/networks/openshift-sdn -type f -exec stat -c \"%U:%G\" {} \;;  done

for i in $(oc get pods -n openshift-sdn -l app=sdn -oname);  do   oc exec -n openshift-sdn $i -- find /var/run/openshift-sdn -type f -exec stat -c %U:%G {} \;;  done

Run the following commands to verify the permissions when using OVS:

for i in $(oc get pods -n openshift-sdn -l app=ovs -oname);  do   oc exec -n openshift-sdn $i --   find /var/run/openvswitch -type f -exec stat -c %U:%G {} \;;  done

for i in $(oc get pods -n openshift-sdn -l app=ovs -oname);  do   oc exec -n openshift-sdn $i --   find /etc/openvswitch -type f -exec stat -c %U:%G {} \;; done

for i in $(oc get pods -n openshift-sdn -l app=ovs -oname);  do   oc exec -n openshift-sdn $i --   find /run/openvswitch -type f -exec stat -c %U:%G {} \;; done

Verify file ownership is set to root:root. In deployments using OCS, verify that the file ownership is set to openvswitch:openvswitch. /var/run/openvswitch = openvswitch:openvswitch /etc/openvswitch = openvswitch:openvswitch /run/openvswitch = openvswitch:openvswitch

Remediation

No remediation required; file permissions are managed by the operator.

Default Value

In OpenShift 4, the default file ownership is root:root for CNI Multus and SDN and openvswitch:openvswitch for the OVS plugin.

/host/etc/cni/net.d/00-multus.conf = root:root /host/var/run/multus/cni/net.d/80-openshift-network.conf = root:root /var/lib/cni/networks/openshift-sdn = root:root /var/run/openshift-sdn = root:root /var/run/openvswitch = openvswitch:openvswitch /etc/openvswitch = openvswitch:openvswitch /run/openvswitch = openvswitch:openvswitch

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts	*	*	*
v7	4.3 Ensure the Use of Dedicated Administrative Accounts	*	*	*

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1083, T1222	TA0005, TA0007	M1026

Profile

Level 1 (Manual)