mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-29 08:20:20 +00:00
134 lines
3.8 KiB
Go
134 lines
3.8 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package policy
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import (
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"fmt"
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"strings"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/pod-security-admission/api"
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)
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/*
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Containers must be required to run as non-root users.
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**Restricted Fields:**
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spec.securityContext.runAsNonRoot
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spec.containers[*].securityContext.runAsNonRoot
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spec.initContainers[*].securityContext.runAsNonRoot
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**Allowed Values:**
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true
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undefined/null at container-level if pod-level is set to true
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*/
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func init() {
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addCheck(CheckRunAsNonRoot)
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}
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// CheckRunAsNonRoot returns a restricted level check
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// that requires runAsNonRoot=true in 1.0+
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func CheckRunAsNonRoot() Check {
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return Check{
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ID: "runAsNonRoot",
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Level: api.LevelRestricted,
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Versions: []VersionedCheck{
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{
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MinimumVersion: api.MajorMinorVersion(1, 0),
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CheckPod: runAsNonRoot_1_0,
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},
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},
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}
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}
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func runAsNonRoot_1_0(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
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// See KEP-127: https://github.com/kubernetes/enhancements/blob/308ba8d/keps/sig-node/127-user-namespaces/README.md?plain=1#L411-L447
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if relaxPolicyForUserNamespacePod(podSpec) {
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return CheckResult{Allowed: true}
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}
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// things that explicitly set runAsNonRoot=false
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var badSetters []string
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podRunAsNonRoot := false
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if podSpec.SecurityContext != nil && podSpec.SecurityContext.RunAsNonRoot != nil {
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if !*podSpec.SecurityContext.RunAsNonRoot {
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badSetters = append(badSetters, "pod")
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} else {
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podRunAsNonRoot = true
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}
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}
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// containers that explicitly set runAsNonRoot=false
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var explicitlyBadContainers []string
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// containers that didn't set runAsNonRoot and aren't caught by a pod-level runAsNonRoot=true
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var implicitlyBadContainers []string
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visitContainers(podSpec, func(container *corev1.Container) {
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if container.SecurityContext != nil && container.SecurityContext.RunAsNonRoot != nil {
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// container explicitly set runAsNonRoot
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if !*container.SecurityContext.RunAsNonRoot {
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// container explicitly set runAsNonRoot to a bad value
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explicitlyBadContainers = append(explicitlyBadContainers, container.Name)
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}
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} else {
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// container did not explicitly set runAsNonRoot
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if !podRunAsNonRoot {
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// no pod-level runAsNonRoot=true, so this container implicitly has a bad value
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implicitlyBadContainers = append(implicitlyBadContainers, container.Name)
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}
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}
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})
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if len(explicitlyBadContainers) > 0 {
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badSetters = append(
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badSetters,
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fmt.Sprintf(
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"%s %s",
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pluralize("container", "containers", len(explicitlyBadContainers)),
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joinQuote(explicitlyBadContainers),
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),
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)
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}
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// pod or containers explicitly set runAsNonRoot=false
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if len(badSetters) > 0 {
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return CheckResult{
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Allowed: false,
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ForbiddenReason: "runAsNonRoot != true",
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ForbiddenDetail: fmt.Sprintf("%s must not set securityContext.runAsNonRoot=false", strings.Join(badSetters, " and ")),
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}
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}
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// pod didn't set runAsNonRoot and not all containers opted into runAsNonRoot
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if len(implicitlyBadContainers) > 0 {
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return CheckResult{
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Allowed: false,
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ForbiddenReason: "runAsNonRoot != true",
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ForbiddenDetail: fmt.Sprintf(
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"pod or %s %s must set securityContext.runAsNonRoot=true",
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pluralize("container", "containers", len(implicitlyBadContainers)),
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joinQuote(implicitlyBadContainers),
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),
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}
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}
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return CheckResult{Allowed: true}
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}
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