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ceph-csi/vendor/k8s.io/pod-security-admission/policy/check_seccompProfile_baseline.go
Madhu Rajanna e3bf375035 rebase: update kubernetes to v1.25.0
update kubernetes to latest v1.25.0
release.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
2022-08-25 16:36:35 +00:00

172 lines
5.1 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/apimachinery/pkg/util/sets"
"k8s.io/pod-security-admission/api"
)
/*
If seccomp profiles are specified, only runtime default and localhost profiles are allowed.
v1.0 - v1.18:
**Restricted Fields:**
metadata.annotations['seccomp.security.alpha.kubernetes.io/pod']
metadata.annotations['container.seccomp.security.alpha.kubernetes.io/*']
**Allowed Values:** 'runtime/default', 'docker/default', 'localhost/*', undefined
v1.19+:
**Restricted Fields:**
spec.securityContext.seccompProfile.type
spec.containers[*].securityContext.seccompProfile.type
spec.initContainers[*].securityContext.seccompProfile.type
**Allowed Values:** 'RuntimeDefault', 'Localhost', undefined
*/
const (
annotationKeyPod = "seccomp.security.alpha.kubernetes.io/pod"
annotationKeyContainerPrefix = "container.seccomp.security.alpha.kubernetes.io/"
checkSeccompBaselineID CheckID = "seccompProfile_baseline"
)
func init() {
addCheck(CheckSeccompBaseline)
}
func CheckSeccompBaseline() Check {
return Check{
ID: checkSeccompBaselineID,
Level: api.LevelBaseline,
Versions: []VersionedCheck{
{
MinimumVersion: api.MajorMinorVersion(1, 0),
CheckPod: seccompProfileBaseline_1_0,
},
{
MinimumVersion: api.MajorMinorVersion(1, 19),
CheckPod: seccompProfileBaseline_1_19,
},
},
}
}
func validSeccomp(t corev1.SeccompProfileType) bool {
return t == corev1.SeccompProfileTypeLocalhost ||
t == corev1.SeccompProfileTypeRuntimeDefault
}
func validSeccompAnnotationValue(v string) bool {
return v == corev1.SeccompProfileRuntimeDefault ||
v == corev1.DeprecatedSeccompProfileDockerDefault ||
strings.HasPrefix(v, corev1.SeccompLocalhostProfileNamePrefix)
}
// seccompProfileBaseline_1_0 checks baseline policy on seccomp alpha annotation
func seccompProfileBaseline_1_0(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
forbidden := sets.NewString()
if val, ok := podMetadata.Annotations[annotationKeyPod]; ok {
if !validSeccompAnnotationValue(val) {
forbidden.Insert(fmt.Sprintf("%s=%q", annotationKeyPod, val))
}
}
visitContainers(podSpec, func(c *corev1.Container) {
annotation := annotationKeyContainerPrefix + c.Name
if val, ok := podMetadata.Annotations[annotation]; ok {
if !validSeccompAnnotationValue(val) {
forbidden.Insert(fmt.Sprintf("%s=%q", annotation, val))
}
}
})
if len(forbidden) > 0 {
return CheckResult{
Allowed: false,
ForbiddenReason: "seccompProfile",
ForbiddenDetail: fmt.Sprintf(
"forbidden %s %s",
pluralize("annotation", "annotations", len(forbidden)),
strings.Join(forbidden.List(), ", "),
),
}
}
return CheckResult{Allowed: true}
}
// seccompProfileBaseline_1_19 checks baseline policy on securityContext.seccompProfile field
func seccompProfileBaseline_1_19(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
// things that explicitly set seccompProfile.type to a bad value
var badSetters []string
badValues := sets.NewString()
if podSpec.SecurityContext != nil && podSpec.SecurityContext.SeccompProfile != nil {
if !validSeccomp(podSpec.SecurityContext.SeccompProfile.Type) {
badSetters = append(badSetters, "pod")
badValues.Insert(string(podSpec.SecurityContext.SeccompProfile.Type))
}
}
// containers that explicitly set seccompProfile.type to a bad value
var explicitlyBadContainers []string
visitContainers(podSpec, func(c *corev1.Container) {
if c.SecurityContext != nil && c.SecurityContext.SeccompProfile != nil {
// container explicitly set seccompProfile
if !validSeccomp(c.SecurityContext.SeccompProfile.Type) {
// container explicitly set seccompProfile to a bad value
explicitlyBadContainers = append(explicitlyBadContainers, c.Name)
badValues.Insert(string(c.SecurityContext.SeccompProfile.Type))
}
}
})
if len(explicitlyBadContainers) > 0 {
badSetters = append(
badSetters,
fmt.Sprintf(
"%s %s",
pluralize("container", "containers", len(explicitlyBadContainers)),
joinQuote(explicitlyBadContainers),
),
)
}
// pod or containers explicitly set bad seccompProfiles
if len(badSetters) > 0 {
return CheckResult{
Allowed: false,
ForbiddenReason: "seccompProfile",
ForbiddenDetail: fmt.Sprintf(
"%s must not set securityContext.seccompProfile.type to %s",
strings.Join(badSetters, " and "),
joinQuote(badValues.List()),
),
}
}
return CheckResult{Allowed: true}
}