kubernetes security_context 源码
kubernetes security_context 代码
文件路径:/pkg/kubelet/kuberuntime/security_context.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 kuberuntime
import (
v1 "k8s.io/api/core/v1"
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
runtimeutil "k8s.io/kubernetes/pkg/kubelet/kuberuntime/util"
"k8s.io/kubernetes/pkg/security/apparmor"
"k8s.io/kubernetes/pkg/securitycontext"
)
// determineEffectiveSecurityContext gets container's security context from v1.Pod and v1.Container.
func (m *kubeGenericRuntimeManager) determineEffectiveSecurityContext(pod *v1.Pod, container *v1.Container, uid *int64, username string) (*runtimeapi.LinuxContainerSecurityContext, error) {
effectiveSc := securitycontext.DetermineEffectiveSecurityContext(pod, container)
synthesized := convertToRuntimeSecurityContext(effectiveSc)
if synthesized == nil {
synthesized = &runtimeapi.LinuxContainerSecurityContext{
MaskedPaths: securitycontext.ConvertToRuntimeMaskedPaths(effectiveSc.ProcMount),
ReadonlyPaths: securitycontext.ConvertToRuntimeReadonlyPaths(effectiveSc.ProcMount),
}
}
// TODO: Deprecated, remove after we switch to Seccomp field
// set SeccompProfilePath.
synthesized.SeccompProfilePath = m.getSeccompProfilePath(pod.Annotations, container.Name, pod.Spec.SecurityContext, container.SecurityContext, m.seccompDefault)
synthesized.Seccomp = m.getSeccompProfile(pod.Annotations, container.Name, pod.Spec.SecurityContext, container.SecurityContext, m.seccompDefault)
// set ApparmorProfile.
synthesized.ApparmorProfile = apparmor.GetProfileNameFromPodAnnotations(pod.Annotations, container.Name)
// set RunAsUser.
if synthesized.RunAsUser == nil {
if uid != nil {
synthesized.RunAsUser = &runtimeapi.Int64Value{Value: *uid}
}
synthesized.RunAsUsername = username
}
// set namespace options and supplemental groups.
namespaceOptions, err := runtimeutil.NamespacesForPod(pod, m.runtimeHelper)
if err != nil {
return nil, err
}
synthesized.NamespaceOptions = namespaceOptions
podSc := pod.Spec.SecurityContext
if podSc != nil {
if podSc.FSGroup != nil {
synthesized.SupplementalGroups = append(synthesized.SupplementalGroups, int64(*podSc.FSGroup))
}
if podSc.SupplementalGroups != nil {
for _, sg := range podSc.SupplementalGroups {
synthesized.SupplementalGroups = append(synthesized.SupplementalGroups, int64(sg))
}
}
}
if groups := m.runtimeHelper.GetExtraSupplementalGroupsForPod(pod); len(groups) > 0 {
synthesized.SupplementalGroups = append(synthesized.SupplementalGroups, groups...)
}
synthesized.NoNewPrivs = securitycontext.AddNoNewPrivileges(effectiveSc)
synthesized.MaskedPaths = securitycontext.ConvertToRuntimeMaskedPaths(effectiveSc.ProcMount)
synthesized.ReadonlyPaths = securitycontext.ConvertToRuntimeReadonlyPaths(effectiveSc.ProcMount)
return synthesized, nil
}
// convertToRuntimeSecurityContext converts v1.SecurityContext to runtimeapi.SecurityContext.
func convertToRuntimeSecurityContext(securityContext *v1.SecurityContext) *runtimeapi.LinuxContainerSecurityContext {
if securityContext == nil {
return nil
}
sc := &runtimeapi.LinuxContainerSecurityContext{
Capabilities: convertToRuntimeCapabilities(securityContext.Capabilities),
SelinuxOptions: convertToRuntimeSELinuxOption(securityContext.SELinuxOptions),
}
if securityContext.RunAsUser != nil {
sc.RunAsUser = &runtimeapi.Int64Value{Value: int64(*securityContext.RunAsUser)}
}
if securityContext.RunAsGroup != nil {
sc.RunAsGroup = &runtimeapi.Int64Value{Value: int64(*securityContext.RunAsGroup)}
}
if securityContext.Privileged != nil {
sc.Privileged = *securityContext.Privileged
}
if securityContext.ReadOnlyRootFilesystem != nil {
sc.ReadonlyRootfs = *securityContext.ReadOnlyRootFilesystem
}
return sc
}
// convertToRuntimeSELinuxOption converts v1.SELinuxOptions to runtimeapi.SELinuxOption.
func convertToRuntimeSELinuxOption(opts *v1.SELinuxOptions) *runtimeapi.SELinuxOption {
if opts == nil {
return nil
}
return &runtimeapi.SELinuxOption{
User: opts.User,
Role: opts.Role,
Type: opts.Type,
Level: opts.Level,
}
}
// convertToRuntimeCapabilities converts v1.Capabilities to runtimeapi.Capability.
func convertToRuntimeCapabilities(opts *v1.Capabilities) *runtimeapi.Capability {
if opts == nil {
return nil
}
capabilities := &runtimeapi.Capability{
AddCapabilities: make([]string, len(opts.Add)),
DropCapabilities: make([]string, len(opts.Drop)),
}
for index, value := range opts.Add {
capabilities.AddCapabilities[index] = string(value)
}
for index, value := range opts.Drop {
capabilities.DropCapabilities[index] = string(value)
}
return capabilities
}
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