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69 lines
3.0 KiB
Go
69 lines
3.0 KiB
Go
// +build windows
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/*
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Copyright 2020 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 kuberuntime
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import (
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"fmt"
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"k8s.io/api/core/v1"
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"k8s.io/klog/v2"
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"k8s.io/kubernetes/pkg/kubelet/util/format"
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"k8s.io/kubernetes/pkg/securitycontext"
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)
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var (
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windowsRootUserName = "ContainerAdministrator"
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)
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// verifyRunAsNonRoot verifies RunAsNonRoot on windows.
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// https://github.com/kubernetes/enhancements/tree/master/keps/sig-windows/116-windows-node-support#v1container
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// Windows does not have a root user, we cannot judge the root identity of the windows container by the way to judge the root(uid=0) of the linux container.
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// According to the discussion of sig-windows, at present, we assume that ContainerAdministrator is the windows container root user,
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// and then optimize this logic according to the best time.
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// https://docs.google.com/document/d/1Tjxzjjuy4SQsFSUVXZbvqVb64hjNAG5CQX8bK7Yda9w
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func verifyRunAsNonRoot(pod *v1.Pod, container *v1.Container, uid *int64, username string) error {
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effectiveSc := securitycontext.DetermineEffectiveSecurityContext(pod, container)
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// If the option is not set, or if running as root is allowed, return nil.
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if effectiveSc == nil || effectiveSc.RunAsNonRoot == nil || !*effectiveSc.RunAsNonRoot {
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return nil
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}
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if effectiveSc.RunAsUser != nil {
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klog.InfoS("Windows container does not support SecurityContext.RunAsUser, please use SecurityContext.WindowsOptions",
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"pod", klog.KObj(pod), "containerName", container.Name)
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}
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if effectiveSc.SELinuxOptions != nil {
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klog.InfoS("Windows container does not support SecurityContext.SELinuxOptions, please use SecurityContext.WindowsOptions",
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"pod", klog.KObj(pod), "containerName", container.Name)
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}
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if effectiveSc.RunAsGroup != nil {
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klog.InfoS("Windows container does not support SecurityContext.RunAsGroup", "pod", klog.KObj(pod), "containerName", container.Name)
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}
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if effectiveSc.WindowsOptions != nil {
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if effectiveSc.WindowsOptions.RunAsUserName != nil {
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if *effectiveSc.WindowsOptions.RunAsUserName == windowsRootUserName {
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return fmt.Errorf("container's runAsUser (%s) which will be regarded as root identity and will break non-root policy (pod: %q, container: %s)", username, format.Pod(pod), container.Name)
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}
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return nil
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}
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}
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if len(username) > 0 && username == windowsRootUserName {
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return fmt.Errorf("container's runAsUser (%s) which will be regarded as root identity and will break non-root policy (pod: %q, container: %s)", username, format.Pod(pod), container.Name)
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}
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return nil
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}
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