// determineEffectiveSecurityContext gets container's security context from api.Pod and api.Container.
func (m *kubeGenericRuntimeManager) determineEffectiveSecurityContext(pod *api.Pod, container *api.Container, imageUser string) *runtimeapi.LinuxContainerSecurityContext {
effectiveSc := securitycontext.DetermineEffectiveSecurityContext(pod, container)
synthesized := convertToRuntimeSecurityContext(effectiveSc)
if synthesized == nil {
synthesized = &runtimeapi.LinuxContainerSecurityContext{}
}
// set RunAsUser.
if synthesized.RunAsUser == nil {
synthesized.RunAsUser = &imageUser
}
// set namespace options and supplemental groups.
podSc := pod.Spec.SecurityContext
if podSc == nil {
return synthesized
}
synthesized.NamespaceOptions = &runtimeapi.NamespaceOption{
HostNetwork: &podSc.HostNetwork,
HostIpc: &podSc.HostIPC,
HostPid: &podSc.HostPID,
}
if podSc.FSGroup != nil {
synthesized.SupplementalGroups = append(synthesized.SupplementalGroups, *podSc.FSGroup)
}
if groups := m.runtimeHelper.GetExtraSupplementalGroupsForPod(pod); len(groups) > 0 {
synthesized.SupplementalGroups = append(synthesized.SupplementalGroups, groups...)
}
if podSc.SupplementalGroups != nil {
synthesized.SupplementalGroups = append(synthesized.SupplementalGroups, podSc.SupplementalGroups...)
}
return synthesized
}
// verifyRunAsNonRoot verifies RunAsNonRoot.
func verifyRunAsNonRoot(pod *api.Pod, container *api.Container, imageUser string) error {
effectiveSc := securitycontext.DetermineEffectiveSecurityContext(pod, container)
if effectiveSc == nil || effectiveSc.RunAsNonRoot == nil {
return nil
}
if effectiveSc.RunAsUser != nil {
if *effectiveSc.RunAsUser == 0 {
return fmt.Errorf("container's runAsUser breaks non-root policy")
}
return nil
}
// Non-root verification only supports numeric user now. For non-numeric user,
// just return nil to by-pass the verfication.
// TODO: Support non-numeric user.
uid, err := strconv.ParseInt(imageUser, 10, 64)
if err != nil {
glog.Warningf("Non-root verification doesn't support non-numeric user (%s)", imageUser)
return nil
}
if uid == 0 {
return fmt.Errorf("container has runAsNonRoot and image will run as root")
}
return nil
}
// assignSecurityContext creates a security context for each container in the pod
// and validates that the sc falls within the scc constraints. All containers must validate against
// the same scc or is not considered valid.
func assignSecurityContext(provider scc.SecurityContextConstraintsProvider, pod *kapi.Pod, fldPath *field.Path) field.ErrorList {
generatedSCs := make([]*kapi.SecurityContext, len(pod.Spec.Containers))
errs := field.ErrorList{}
psc, err := provider.CreatePodSecurityContext(pod)
if err != nil {
errs = append(errs, field.Invalid(field.NewPath("spec", "securityContext"), pod.Spec.SecurityContext, err.Error()))
}
// save the original PSC and validate the generated PSC. Leave the generated PSC
// set for container generation/validation. We will reset to original post container
// validation.
originalPSC := pod.Spec.SecurityContext
pod.Spec.SecurityContext = psc
errs = append(errs, provider.ValidatePodSecurityContext(pod, field.NewPath("spec", "securityContext"))...)
// Note: this is not changing the original container, we will set container SCs later so long
// as all containers validated under the same SCC.
for i, containerCopy := range pod.Spec.Containers {
// We will determine the effective security context for the container and validate against that
// since that is how the sc provider will eventually apply settings in the runtime.
// This results in an SC that is based on the Pod's PSC with the set fields from the container
// overriding pod level settings.
containerCopy.SecurityContext = sc.DetermineEffectiveSecurityContext(pod, &containerCopy)
sc, err := provider.CreateContainerSecurityContext(pod, &containerCopy)
if err != nil {
errs = append(errs, field.Invalid(field.NewPath("spec", "containers").Index(i).Child("securityContext"), "", err.Error()))
continue
}
generatedSCs[i] = sc
containerCopy.SecurityContext = sc
errs = append(errs, provider.ValidateContainerSecurityContext(pod, &containerCopy, field.NewPath("spec", "containers").Index(i).Child("securityContext"))...)
}
if len(errs) > 0 {
// ensure psc is not mutated if there are errors
pod.Spec.SecurityContext = originalPSC
return errs
}
// if we've reached this code then we've generated and validated an SC for every container in the
// pod so let's apply what we generated. Note: the psc is already applied.
for i, sc := range generatedSCs {
pod.Spec.Containers[i].SecurityContext = sc
}
return nil
}
// resolveContainerSecurityContext checks the provided container against the provider, returning any
// validation errors encountered on the resulting security context, or the security context that was
// resolved. The SecurityContext field of the container is updated, so ensure that a copy of the original
// container is passed here if you wish to preserve the original input.
func resolveContainerSecurityContext(provider scc.SecurityContextConstraintsProvider, pod *kapi.Pod, container *kapi.Container, path *field.Path) (*kapi.SecurityContext, field.ErrorList) {
// We will determine the effective security context for the container and validate against that
// since that is how the sc provider will eventually apply settings in the runtime.
// This results in an SC that is based on the Pod's PSC with the set fields from the container
// overriding pod level settings.
container.SecurityContext = sc.DetermineEffectiveSecurityContext(pod, container)
csc, err := provider.CreateContainerSecurityContext(pod, container)
if err != nil {
return nil, field.ErrorList{field.Invalid(path.Child("securityContext"), "", err.Error())}
}
container.SecurityContext = csc
return csc, provider.ValidateContainerSecurityContext(pod, container, path.Child("securityContext"))
}
// verifyRunAsNonRoot verifies RunAsNonRoot.
func verifyRunAsNonRoot(pod *api.Pod, container *api.Container, imageUser int64) error {
effectiveSc := securitycontext.DetermineEffectiveSecurityContext(pod, container)
if effectiveSc == nil || effectiveSc.RunAsNonRoot == nil {
return nil
}
if effectiveSc.RunAsUser != nil && *effectiveSc.RunAsUser == 0 {
return fmt.Errorf("container's runAsUser breaks non-root policy")
}
if imageUser == 0 {
return fmt.Errorf("container has runAsNonRoot and image will run as root")
}
return nil
}
func (r *Runtime) newAppcRuntimeApp(pod *api.Pod, c api.Container, pullSecrets []api.Secret) (*appcschema.RuntimeApp, []kubecontainer.PortMapping, error) {
if err, _ := r.imagePuller.PullImage(pod, &c, pullSecrets); err != nil {
return nil, nil, err
}
imgManifest, err := r.getImageManifest(c.Image)
if err != nil {
return nil, nil, err
}
if imgManifest.App == nil {
imgManifest.App = new(appctypes.App)
}
imageID, err := r.getImageID(c.Image)
if err != nil {
return nil, nil, err
}
hash, err := appctypes.NewHash(imageID)
if err != nil {
return nil, nil, err
}
opts, err := r.generator.GenerateRunContainerOptions(pod, &c)
if err != nil {
return nil, nil, err
}
ctx := securitycontext.DetermineEffectiveSecurityContext(pod, &c)
if err := setApp(imgManifest.App, &c, opts, ctx, pod.Spec.SecurityContext); err != nil {
return nil, nil, err
}
return &appcschema.RuntimeApp{
Name: convertToACName(c.Name),
Image: appcschema.RuntimeImage{ID: *hash},
App: imgManifest.App,
Annotations: []appctypes.Annotation{
{
Name: *appctypes.MustACIdentifier(k8sRktContainerHashAnno),
Value: strconv.FormatUint(kubecontainer.HashContainer(&c), 10),
},
},
}, opts.PortMappings, nil
}
func (r *Runtime) newAppcRuntimeApp(pod *api.Pod, c api.Container, pullSecrets []api.Secret, manifest *appcschema.PodManifest) error {
if err, _ := r.imagePuller.PullImage(pod, &c, pullSecrets); err != nil {
return nil
}
imgManifest, err := r.getImageManifest(c.Image)
if err != nil {
return err
}
if imgManifest.App == nil {
imgManifest.App = new(appctypes.App)
}
imageID, err := r.getImageID(c.Image)
if err != nil {
return err
}
hash, err := appctypes.NewHash(imageID)
if err != nil {
return err
}
opts, err := r.runtimeHelper.GenerateRunContainerOptions(pod, &c)
if err != nil {
return err
}
// create the container log file and make a mount pair.
mnt, err := makeContainerLogMount(opts, &c)
if err != nil {
return err
}
ctx := securitycontext.DetermineEffectiveSecurityContext(pod, &c)
if err := setApp(imgManifest.App, &c, opts, ctx, pod.Spec.SecurityContext); err != nil {
return err
}
ra := appcschema.RuntimeApp{
Name: convertToACName(c.Name),
Image: appcschema.RuntimeImage{ID: *hash},
App: imgManifest.App,
Annotations: []appctypes.Annotation{
{
Name: *appctypes.MustACIdentifier(k8sRktContainerHashAnno),
Value: strconv.FormatUint(kubecontainer.HashContainer(&c), 10),
},
},
}
if mnt != nil {
ra.Annotations = append(ra.Annotations, appctypes.Annotation{
Name: *appctypes.MustACIdentifier(k8sRktTerminationMessagePathAnno),
Value: mnt.HostPath,
})
manifest.Volumes = append(manifest.Volumes, appctypes.Volume{
Name: convertToACName(mnt.Name),
Kind: "host",
Source: mnt.HostPath,
})
}
manifest.Apps = append(manifest.Apps, ra)
// Set global ports.
for _, port := range opts.PortMappings {
manifest.Ports = append(manifest.Ports, appctypes.ExposedPort{
Name: convertToACName(port.Name),
HostPort: uint(port.HostPort),
})
}
return nil
}