mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-09-19 15:09:56 +00:00
5a66991bb3
updating the kubernetes release to the latest in main go.mod Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
103 lines
3.0 KiB
Go
103 lines
3.0 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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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/pod-security-admission/api"
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)
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/*
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The default /proc masks are set up to reduce attack surface, and should be required.
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**Restricted Fields:**
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spec.containers[*].securityContext.procMount
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spec.initContainers[*].securityContext.procMount
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**Allowed Values:** undefined/null, "Default"
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However, if the pod is in a user namespace (`hostUsers: false`), and the
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UserNamespacesPodSecurityStandards feature is enabled, all values are allowed.
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*/
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func init() {
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addCheck(CheckProcMount)
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}
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// CheckProcMount returns a baseline level check that restricts
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// setting the value of securityContext.procMount to DefaultProcMount
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// in 1.0+
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func CheckProcMount() Check {
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return Check{
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ID: "procMount",
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Level: api.LevelBaseline,
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Versions: []VersionedCheck{
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{
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MinimumVersion: api.MajorMinorVersion(1, 0),
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CheckPod: procMount_1_0,
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},
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},
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}
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}
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func procMount_1_0(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
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// TODO: When we remove the UserNamespacesPodSecurityStandards feature gate (and GA this relaxation),
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// create a new policy version.
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// Note: pod validation will check for well formed procMount type, so avoid double validation and allow everything
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// here.
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if relaxPolicyForUserNamespacePod(podSpec) {
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return CheckResult{Allowed: true}
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}
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var badContainers []string
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forbiddenProcMountTypes := sets.NewString()
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visitContainers(podSpec, func(container *corev1.Container) {
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// allow if the security context is nil.
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if container.SecurityContext == nil {
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return
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}
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// allow if proc mount is not set.
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if container.SecurityContext.ProcMount == nil {
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return
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}
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// check if the value of the proc mount type is valid.
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if *container.SecurityContext.ProcMount != corev1.DefaultProcMount {
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badContainers = append(badContainers, container.Name)
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forbiddenProcMountTypes.Insert(string(*container.SecurityContext.ProcMount))
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}
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})
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if len(badContainers) > 0 {
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return CheckResult{
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Allowed: false,
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ForbiddenReason: "procMount",
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ForbiddenDetail: fmt.Sprintf(
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"%s %s must not set securityContext.procMount to %s",
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pluralize("container", "containers", len(badContainers)),
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joinQuote(badContainers),
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joinQuote(forbiddenProcMountTypes.List()),
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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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