mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-30 02:00:19 +00:00
105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
/*
|
|
Copyright 2021 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package policy
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
corev1 "k8s.io/api/core/v1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/pod-security-admission/api"
|
|
)
|
|
|
|
/*
|
|
Containers must not set runAsUser: 0
|
|
|
|
**Restricted Fields:**
|
|
|
|
spec.securityContext.runAsUser
|
|
spec.containers[*].securityContext.runAsUser
|
|
spec.initContainers[*].securityContext.runAsUser
|
|
|
|
**Allowed Values:**
|
|
non-zero values
|
|
undefined/null
|
|
|
|
*/
|
|
|
|
func init() {
|
|
addCheck(CheckRunAsUser)
|
|
}
|
|
|
|
// CheckRunAsUser returns a restricted level check
|
|
// that forbides runAsUser=0 in 1.23+
|
|
func CheckRunAsUser() Check {
|
|
return Check{
|
|
ID: "runAsUser",
|
|
Level: api.LevelRestricted,
|
|
Versions: []VersionedCheck{
|
|
{
|
|
MinimumVersion: api.MajorMinorVersion(1, 23),
|
|
CheckPod: runAsUser_1_23,
|
|
},
|
|
},
|
|
}
|
|
}
|
|
|
|
func runAsUser_1_23(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
|
|
// See KEP-127: https://github.com/kubernetes/enhancements/blob/308ba8d/keps/sig-node/127-user-namespaces/README.md?plain=1#L411-L447
|
|
if relaxPolicyForUserNamespacePod(podSpec) {
|
|
return CheckResult{Allowed: true}
|
|
}
|
|
|
|
// things that explicitly set runAsUser=0
|
|
var badSetters []string
|
|
|
|
if podSpec.SecurityContext != nil && podSpec.SecurityContext.RunAsUser != nil && *podSpec.SecurityContext.RunAsUser == 0 {
|
|
badSetters = append(badSetters, "pod")
|
|
}
|
|
|
|
// containers that explicitly set runAsUser=0
|
|
var explicitlyBadContainers []string
|
|
|
|
visitContainers(podSpec, func(container *corev1.Container) {
|
|
if container.SecurityContext != nil && container.SecurityContext.RunAsUser != nil && *container.SecurityContext.RunAsUser == 0 {
|
|
explicitlyBadContainers = append(explicitlyBadContainers, container.Name)
|
|
}
|
|
})
|
|
|
|
if len(explicitlyBadContainers) > 0 {
|
|
badSetters = append(
|
|
badSetters,
|
|
fmt.Sprintf(
|
|
"%s %s",
|
|
pluralize("container", "containers", len(explicitlyBadContainers)),
|
|
joinQuote(explicitlyBadContainers),
|
|
),
|
|
)
|
|
}
|
|
// pod or containers explicitly set runAsUser=0
|
|
if len(badSetters) > 0 {
|
|
return CheckResult{
|
|
Allowed: false,
|
|
ForbiddenReason: "runAsUser=0",
|
|
ForbiddenDetail: fmt.Sprintf("%s must not set runAsUser=0", strings.Join(badSetters, " and ")),
|
|
}
|
|
}
|
|
|
|
return CheckResult{Allowed: true}
|
|
}
|