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PodSecurity: runAsUser
This commit is contained in:
Jordan Liggitt
parent
9b930e3728
commit
a476a5e00e
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/*
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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/pod-security-admission/api"
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)
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/*
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Containers must not set runAsUser: 0
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**Restricted Fields:**
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spec.securityContext.runAsUser
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spec.containers[*].securityContext.runAsUser
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spec.initContainers[*].securityContext.runAsUser
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**Allowed Values:**
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non-zero values
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undefined/null
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*/
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func init() {
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addCheck(CheckRunAsUser)
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}
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// CheckRunAsUser returns a restricted level check
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// that forbides runAsUser=0 in 1.23+
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func CheckRunAsUser() Check {
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return Check{
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ID: "runAsUser",
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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, 23),
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CheckPod: runAsUser_1_23,
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},
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},
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}
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}
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func runAsUser_1_23(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
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// things that explicitly set runAsUser=0
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var badSetters []string
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if podSpec.SecurityContext != nil && podSpec.SecurityContext.RunAsUser != nil && *podSpec.SecurityContext.RunAsUser == 0 {
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badSetters = append(badSetters, "pod")
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}
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// containers that explicitly set runAsUser=0
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var explicitlyBadContainers []string
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visitContainers(podSpec, func(container *corev1.Container) {
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if container.SecurityContext != nil && container.SecurityContext.RunAsUser != nil && *container.SecurityContext.RunAsUser == 0 {
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explicitlyBadContainers = append(explicitlyBadContainers, container.Name)
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}
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})
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if len(explicitlyBadContainers) > 0 {
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badSetters = append(
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badSetters,
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fmt.Sprintf(
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"%s %s",
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pluralize("container", "containers", len(explicitlyBadContainers)),
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joinQuote(explicitlyBadContainers),
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),
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)
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}
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// pod or containers explicitly set runAsUser=0
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if len(badSetters) > 0 {
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return CheckResult{
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Allowed: false,
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ForbiddenReason: "runAsUser=0",
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ForbiddenDetail: fmt.Sprintf("%s must not set runAsUser=0", strings.Join(badSetters, " and ")),
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}
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}
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return CheckResult{Allowed: true}
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}
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@ -0,0 +1,115 @@
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/*
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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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"testing"
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corev1 "k8s.io/api/core/v1"
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utilpointer "k8s.io/utils/pointer"
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)
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func TestRunAsUser(t *testing.T) {
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tests := []struct {
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name string
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pod *corev1.Pod
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expectAllow bool
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expectReason string
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expectDetail string
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}{
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{
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name: "pod runAsUser=0",
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pod: &corev1.Pod{Spec: corev1.PodSpec{
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SecurityContext: &corev1.PodSecurityContext{RunAsUser: utilpointer.Int64(0)},
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Containers: []corev1.Container{
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{Name: "a", SecurityContext: nil},
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},
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}},
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expectReason: `runAsUser=0`,
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expectDetail: `pod must not set runAsUser=0`,
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},
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{
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name: "pod runAsUser=non-zero",
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pod: &corev1.Pod{Spec: corev1.PodSpec{
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SecurityContext: &corev1.PodSecurityContext{RunAsUser: utilpointer.Int64(1000)},
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Containers: []corev1.Container{
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{Name: "a", SecurityContext: nil},
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},
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}},
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expectAllow: true,
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},
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{
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name: "pod runAsUser=nil",
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pod: &corev1.Pod{Spec: corev1.PodSpec{
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SecurityContext: &corev1.PodSecurityContext{RunAsUser: nil},
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Containers: []corev1.Container{
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{Name: "a", SecurityContext: nil},
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},
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}},
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expectAllow: true,
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},
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{
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name: "containers runAsUser=0",
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pod: &corev1.Pod{Spec: corev1.PodSpec{
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SecurityContext: &corev1.PodSecurityContext{RunAsUser: utilpointer.Int64(1000)},
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Containers: []corev1.Container{
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{Name: "a", SecurityContext: nil},
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{Name: "b", SecurityContext: &corev1.SecurityContext{}},
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{Name: "c", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(0)}},
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{Name: "d", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(0)}},
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{Name: "e", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(1)}},
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{Name: "f", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(1)}},
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},
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}},
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expectReason: `runAsUser=0`,
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expectDetail: `containers "c", "d" must not set runAsUser=0`,
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},
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{
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name: "containers runAsUser=non-zero",
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pod: &corev1.Pod{Spec: corev1.PodSpec{
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Containers: []corev1.Container{
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{Name: "c", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(1)}},
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{Name: "d", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(2)}},
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{Name: "e", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(3)}},
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{Name: "f", SecurityContext: &corev1.SecurityContext{RunAsUser: utilpointer.Int64(4)}},
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},
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}},
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expectAllow: true,
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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result := runAsUser_1_23(&tc.pod.ObjectMeta, &tc.pod.Spec)
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if tc.expectAllow {
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if !result.Allowed {
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t.Fatalf("expected to be allowed, disallowed: %s, %s", result.ForbiddenReason, result.ForbiddenDetail)
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}
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return
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}
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if result.Allowed {
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t.Fatal("expected disallowed")
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}
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if e, a := tc.expectReason, result.ForbiddenReason; e != a {
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t.Errorf("expected\n%s\ngot\n%s", e, a)
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}
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if e, a := tc.expectDetail, result.ForbiddenDetail; e != a {
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t.Errorf("expected\n%s\ngot\n%s", e, a)
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}
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})
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}
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}
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@ -0,0 +1,66 @@
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/*
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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 test
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import (
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corev1 "k8s.io/api/core/v1"
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"k8s.io/pod-security-admission/api"
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"k8s.io/utils/pointer"
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)
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/*
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TODO: include field paths in reflect-based unit test
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podFields: []string{
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`securityContext.runAsUser`,
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},
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containerFields: []string{
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`securityContext.runAsUser`,
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},
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*/
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func init() {
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fixtureData_1_23 := fixtureGenerator{
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generatePass: func(p *corev1.Pod) []*corev1.Pod {
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p = ensureSecurityContext(p)
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return []*corev1.Pod{
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tweak(p, func(p *corev1.Pod) {
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p.Spec.SecurityContext.RunAsUser = pointer.Int64Ptr(1000)
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p.Spec.Containers[0].SecurityContext.RunAsUser = pointer.Int64Ptr(1000)
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p.Spec.InitContainers[0].SecurityContext.RunAsUser = pointer.Int64Ptr(1000)
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}),
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}
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},
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generateFail: func(p *corev1.Pod) []*corev1.Pod {
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p = ensureSecurityContext(p)
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return []*corev1.Pod{
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// explicit 0 on pod
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tweak(p, func(p *corev1.Pod) { p.Spec.SecurityContext.RunAsUser = pointer.Int64Ptr(0) }),
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// explicit 0 on containers
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tweak(p, func(p *corev1.Pod) { p.Spec.Containers[0].SecurityContext.RunAsUser = pointer.Int64Ptr(0) }),
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tweak(p, func(p *corev1.Pod) { p.Spec.InitContainers[0].SecurityContext.RunAsUser = pointer.Int64Ptr(0) }),
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}
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},
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}
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registerFixtureGenerator(
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fixtureKey{level: api.LevelRestricted, version: api.MajorMinorVersion(1, 23), check: "runAsUser"},
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fixtureData_1_23,
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)
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}
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