mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-22 22:30:23 +00:00
e3bf375035
update kubernetes to latest v1.25.0 release. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
146 lines
4.4 KiB
Go
146 lines
4.4 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/apimachinery/pkg/util/sets"
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"k8s.io/pod-security-admission/api"
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)
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const (
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capabilityAll = "ALL"
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capabilityNetBindService = "NET_BIND_SERVICE"
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)
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/*
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Containers must drop ALL, and may only add NET_BIND_SERVICE.
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**Restricted Fields:**
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spec.containers[*].securityContext.capabilities.drop
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spec.initContainers[*].securityContext.capabilities.drop
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**Allowed Values:**
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Must include "ALL"
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**Restricted Fields:**
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spec.containers[*].securityContext.capabilities.add
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spec.initContainers[*].securityContext.capabilities.add
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**Allowed Values:**
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undefined / empty
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"NET_BIND_SERVICE"
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*/
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func init() {
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addCheck(CheckCapabilitiesRestricted)
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}
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// CheckCapabilitiesRestricted returns a restricted level check
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// that ensures ALL capabilities are dropped in 1.22+
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func CheckCapabilitiesRestricted() Check {
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return Check{
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ID: "capabilities_restricted",
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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, 22),
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CheckPod: capabilitiesRestricted_1_22,
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OverrideCheckIDs: []CheckID{checkCapabilitiesBaselineID},
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},
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// Starting 1.25, windows pods would be exempted from this check using pod.spec.os field when set to windows.
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{
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MinimumVersion: api.MajorMinorVersion(1, 25),
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CheckPod: capabilitiesRestricted_1_25,
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OverrideCheckIDs: []CheckID{checkCapabilitiesBaselineID},
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},
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},
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}
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}
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func capabilitiesRestricted_1_22(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
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var (
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containersMissingDropAll []string
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containersAddingForbidden []string
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forbiddenCapabilities = sets.NewString()
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)
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visitContainers(podSpec, func(container *corev1.Container) {
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if container.SecurityContext == nil || container.SecurityContext.Capabilities == nil {
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containersMissingDropAll = append(containersMissingDropAll, container.Name)
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return
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}
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droppedAll := false
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for _, c := range container.SecurityContext.Capabilities.Drop {
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if c == capabilityAll {
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droppedAll = true
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break
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}
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}
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if !droppedAll {
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containersMissingDropAll = append(containersMissingDropAll, container.Name)
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}
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addedForbidden := false
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for _, c := range container.SecurityContext.Capabilities.Add {
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if c != capabilityNetBindService {
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addedForbidden = true
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forbiddenCapabilities.Insert(string(c))
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}
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}
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if addedForbidden {
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containersAddingForbidden = append(containersAddingForbidden, container.Name)
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}
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})
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var forbiddenDetails []string
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if len(containersMissingDropAll) > 0 {
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forbiddenDetails = append(forbiddenDetails, fmt.Sprintf(
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`%s %s must set securityContext.capabilities.drop=["ALL"]`,
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pluralize("container", "containers", len(containersMissingDropAll)),
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joinQuote(containersMissingDropAll)))
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}
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if len(containersAddingForbidden) > 0 {
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forbiddenDetails = append(forbiddenDetails, fmt.Sprintf(
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`%s %s must not include %s in securityContext.capabilities.add`,
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pluralize("container", "containers", len(containersAddingForbidden)),
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joinQuote(containersAddingForbidden),
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joinQuote(forbiddenCapabilities.List())))
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}
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if len(forbiddenDetails) > 0 {
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return CheckResult{
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Allowed: false,
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ForbiddenReason: "unrestricted capabilities",
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ForbiddenDetail: strings.Join(forbiddenDetails, "; "),
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}
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}
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return CheckResult{Allowed: true}
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}
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func capabilitiesRestricted_1_25(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
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// Pod API validation would have failed if podOS == Windows and if capabilities have been set.
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// We can admit the Windows pod even if capabilities has not been set.
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if podSpec.OS != nil && podSpec.OS.Name == corev1.Windows {
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return CheckResult{Allowed: true}
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}
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return capabilitiesRestricted_1_22(podMetadata, podSpec)
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}
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