mirror of https://github.com/k3s-io/k3s
130 lines
3.3 KiB
Go
130 lines
3.3 KiB
Go
/*
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Copyright 2016 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 kubelet
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import (
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"fmt"
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"os"
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"k8s.io/api/core/v1"
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"k8s.io/kubernetes/pkg/capabilities"
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kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
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"k8s.io/kubernetes/pkg/securitycontext"
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)
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// Check whether we have the capabilities to run the specified pod.
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func canRunPod(pod *v1.Pod) error {
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if !capabilities.Get().AllowPrivileged {
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for _, container := range pod.Spec.Containers {
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if securitycontext.HasPrivilegedRequest(&container) {
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return fmt.Errorf("pod with UID %q specified privileged container, but is disallowed", pod.UID)
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}
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}
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for _, container := range pod.Spec.InitContainers {
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if securitycontext.HasPrivilegedRequest(&container) {
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return fmt.Errorf("pod with UID %q specified privileged init container, but is disallowed", pod.UID)
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}
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}
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}
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if pod.Spec.HostNetwork {
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allowed, err := allowHostNetwork(pod)
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if err != nil {
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return err
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}
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if !allowed {
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return fmt.Errorf("pod with UID %q specified host networking, but is disallowed", pod.UID)
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}
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}
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if pod.Spec.HostPID {
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allowed, err := allowHostPID(pod)
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if err != nil {
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return err
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}
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if !allowed {
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return fmt.Errorf("pod with UID %q specified host PID, but is disallowed", pod.UID)
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}
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}
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if pod.Spec.HostIPC {
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allowed, err := allowHostIPC(pod)
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if err != nil {
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return err
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}
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if !allowed {
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return fmt.Errorf("pod with UID %q specified host ipc, but is disallowed", pod.UID)
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}
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}
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return nil
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}
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// Determined whether the specified pod is allowed to use host networking
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func allowHostNetwork(pod *v1.Pod) (bool, error) {
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podSource, err := kubetypes.GetPodSource(pod)
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if err != nil {
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return false, err
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}
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for _, source := range capabilities.Get().PrivilegedSources.HostNetworkSources {
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if source == podSource {
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return true, nil
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}
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}
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return false, nil
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}
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// Determined whether the specified pod is allowed to use host PID
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func allowHostPID(pod *v1.Pod) (bool, error) {
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podSource, err := kubetypes.GetPodSource(pod)
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if err != nil {
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return false, err
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}
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for _, source := range capabilities.Get().PrivilegedSources.HostPIDSources {
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if source == podSource {
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return true, nil
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}
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}
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return false, nil
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}
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// Determined whether the specified pod is allowed to use host ipc
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func allowHostIPC(pod *v1.Pod) (bool, error) {
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podSource, err := kubetypes.GetPodSource(pod)
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if err != nil {
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return false, err
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}
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for _, source := range capabilities.Get().PrivilegedSources.HostIPCSources {
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if source == podSource {
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return true, nil
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}
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}
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return false, nil
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}
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// dirExists returns true if the path exists and represents a directory.
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func dirExists(path string) bool {
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s, err := os.Stat(path)
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if err != nil {
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return false
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}
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return s.IsDir()
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}
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// empty is a placeholder type used to implement a set
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type empty struct{}
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