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e204d863a5
* Update Kubernetes to v1.22.1 * Update dependent modules to track with upstream Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
80 lines
2.3 KiB
Go
80 lines
2.3 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/pod-security-admission/api"
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)
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/*
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Privilege escalation (such as via set-user-ID or set-group-ID file mode) should not be allowed.
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**Restricted Fields:**
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spec.containers[*].securityContext.allowPrivilegeEscalation
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spec.initContainers[*].securityContext.allowPrivilegeEscalation
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**Allowed Values:** false
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*/
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func init() {
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addCheck(CheckAllowPrivilegeEscalation)
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}
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// CheckAllowPrivilegeEscalation returns a restricted level check
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// that requires allowPrivilegeEscalation=false in 1.8+
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func CheckAllowPrivilegeEscalation() Check {
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return Check{
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ID: "allowPrivilegeEscalation",
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Level: api.LevelRestricted,
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Versions: []VersionedCheck{
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{
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// Field added in 1.8:
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// https://github.com/kubernetes/kubernetes/blob/v1.8.0/staging/src/k8s.io/api/core/v1/types.go#L4797-L4804
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MinimumVersion: api.MajorMinorVersion(1, 8),
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CheckPod: allowPrivilegeEscalation_1_8,
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},
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},
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}
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}
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func allowPrivilegeEscalation_1_8(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
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var badContainers []string
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visitContainers(podSpec, func(container *corev1.Container) {
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if container.SecurityContext == nil || container.SecurityContext.AllowPrivilegeEscalation == nil || *container.SecurityContext.AllowPrivilegeEscalation {
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badContainers = append(badContainers, container.Name)
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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: "allowPrivilegeEscalation != false",
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ForbiddenDetail: fmt.Sprintf(
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"%s %s must set securityContext.allowPrivilegeEscalation=false",
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pluralize("container", "containers", len(badContainers)),
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joinQuote(badContainers),
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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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