mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-22 04:50:23 +00:00
130 lines
3.3 KiB
Go
130 lines
3.3 KiB
Go
/*
|
|
Copyright 2016 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 kubelet
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
|
|
"k8s.io/api/core/v1"
|
|
"k8s.io/kubernetes/pkg/capabilities"
|
|
kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
|
|
"k8s.io/kubernetes/pkg/securitycontext"
|
|
)
|
|
|
|
// Check whether we have the capabilities to run the specified pod.
|
|
func canRunPod(pod *v1.Pod) error {
|
|
if !capabilities.Get().AllowPrivileged {
|
|
for _, container := range pod.Spec.Containers {
|
|
if securitycontext.HasPrivilegedRequest(&container) {
|
|
return fmt.Errorf("pod with UID %q specified privileged container, but is disallowed", pod.UID)
|
|
}
|
|
}
|
|
for _, container := range pod.Spec.InitContainers {
|
|
if securitycontext.HasPrivilegedRequest(&container) {
|
|
return fmt.Errorf("pod with UID %q specified privileged init container, but is disallowed", pod.UID)
|
|
}
|
|
}
|
|
}
|
|
|
|
if pod.Spec.HostNetwork {
|
|
allowed, err := allowHostNetwork(pod)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !allowed {
|
|
return fmt.Errorf("pod with UID %q specified host networking, but is disallowed", pod.UID)
|
|
}
|
|
}
|
|
|
|
if pod.Spec.HostPID {
|
|
allowed, err := allowHostPID(pod)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !allowed {
|
|
return fmt.Errorf("pod with UID %q specified host PID, but is disallowed", pod.UID)
|
|
}
|
|
}
|
|
|
|
if pod.Spec.HostIPC {
|
|
allowed, err := allowHostIPC(pod)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !allowed {
|
|
return fmt.Errorf("pod with UID %q specified host ipc, but is disallowed", pod.UID)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Determined whether the specified pod is allowed to use host networking
|
|
func allowHostNetwork(pod *v1.Pod) (bool, error) {
|
|
podSource, err := kubetypes.GetPodSource(pod)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
for _, source := range capabilities.Get().PrivilegedSources.HostNetworkSources {
|
|
if source == podSource {
|
|
return true, nil
|
|
}
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
// Determined whether the specified pod is allowed to use host PID
|
|
func allowHostPID(pod *v1.Pod) (bool, error) {
|
|
podSource, err := kubetypes.GetPodSource(pod)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
for _, source := range capabilities.Get().PrivilegedSources.HostPIDSources {
|
|
if source == podSource {
|
|
return true, nil
|
|
}
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
// Determined whether the specified pod is allowed to use host ipc
|
|
func allowHostIPC(pod *v1.Pod) (bool, error) {
|
|
podSource, err := kubetypes.GetPodSource(pod)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
for _, source := range capabilities.Get().PrivilegedSources.HostIPCSources {
|
|
if source == podSource {
|
|
return true, nil
|
|
}
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
// dirExists returns true if the path exists and represents a directory.
|
|
func dirExists(path string) bool {
|
|
s, err := os.Stat(path)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
return s.IsDir()
|
|
}
|
|
|
|
// empty is a placeholder type used to implement a set
|
|
type empty struct{}
|