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rest.go
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rest.go
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package podsecuritypolicysubjectreview
import (
"fmt"
"sort"
"github.com/golang/glog"
kapierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/apiserver/pkg/authentication/user"
apirequest "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/registry/rest"
"k8s.io/kubernetes/pkg/api/legacyscheme"
kapiref "k8s.io/kubernetes/pkg/api/ref"
kapi "k8s.io/kubernetes/pkg/apis/core"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/serviceaccount"
securityapi "github.com/openshift/origin/pkg/security/apis/security"
securityvalidation "github.com/openshift/origin/pkg/security/apis/security/validation"
scc "github.com/openshift/origin/pkg/security/securitycontextconstraints"
)
// REST implements the RESTStorage interface in terms of an Registry.
type REST struct {
sccMatcher scc.SCCMatcher
client clientset.Interface
}
var _ rest.Creater = &REST{}
// NewREST creates a new REST for policies..
func NewREST(m scc.SCCMatcher, c clientset.Interface) *REST {
return &REST{sccMatcher: m, client: c}
}
// New creates a new PodSecurityPolicySubjectReview object
func (r *REST) New() runtime.Object {
return &securityapi.PodSecurityPolicySubjectReview{}
}
// Create registers a given new PodSecurityPolicySubjectReview instance to r.registry.
func (r *REST) Create(ctx apirequest.Context, obj runtime.Object, _ rest.ValidateObjectFunc, _ bool) (runtime.Object, error) {
pspsr, ok := obj.(*securityapi.PodSecurityPolicySubjectReview)
if !ok {
return nil, kapierrors.NewBadRequest(fmt.Sprintf("not a PodSecurityPolicySubjectReview: %#v", obj))
}
ns, ok := apirequest.NamespaceFrom(ctx)
if !ok {
return nil, kapierrors.NewBadRequest("namespace parameter required.")
}
if errs := securityvalidation.ValidatePodSecurityPolicySubjectReview(pspsr); len(errs) > 0 {
return nil, kapierrors.NewInvalid(kapi.Kind("PodSecurityPolicySubjectReview"), "", errs)
}
userInfo := &user.DefaultInfo{Name: pspsr.Spec.User, Groups: pspsr.Spec.Groups}
matchedConstraints, err := r.sccMatcher.FindApplicableSCCs(userInfo, ns)
if err != nil {
return nil, kapierrors.NewBadRequest(fmt.Sprintf("unable to find SecurityContextConstraints: %v", err))
}
saName := pspsr.Spec.Template.Spec.ServiceAccountName
if len(saName) > 0 {
saUserInfo := serviceaccount.UserInfo(ns, saName, "")
saConstraints, err := r.sccMatcher.FindApplicableSCCs(saUserInfo, ns)
if err != nil {
return nil, kapierrors.NewBadRequest(fmt.Sprintf("unable to find SecurityContextConstraints: %v", err))
}
matchedConstraints = append(matchedConstraints, saConstraints...)
}
scc.DeduplicateSecurityContextConstraints(matchedConstraints)
sort.Sort(scc.ByPriority(matchedConstraints))
var namespace *kapi.Namespace
for _, constraint := range matchedConstraints {
var (
provider scc.SecurityContextConstraintsProvider
err error
)
if provider, namespace, err = scc.CreateProviderFromConstraint(ns, namespace, constraint, r.client); err != nil {
glog.Errorf("Unable to create provider for constraint: %v", err)
continue
}
filled, err := FillPodSecurityPolicySubjectReviewStatus(&pspsr.Status, provider, pspsr.Spec.Template.Spec, constraint)
if err != nil {
glog.Errorf("unable to fill PodSecurityPolicySubjectReviewStatus from constraint %v", err)
continue
}
if filled {
return pspsr, nil
}
}
return pspsr, nil
}
// FillPodSecurityPolicySubjectReviewStatus fills PodSecurityPolicySubjectReviewStatus assigning SecurityContectConstraint to the PodSpec
func FillPodSecurityPolicySubjectReviewStatus(s *securityapi.PodSecurityPolicySubjectReviewStatus, provider scc.SecurityContextConstraintsProvider, spec kapi.PodSpec, constraint *securityapi.SecurityContextConstraints) (bool, error) {
pod := &kapi.Pod{
Spec: spec,
}
if errs := scc.AssignSecurityContext(provider, pod, field.NewPath(fmt.Sprintf("provider %s: ", provider.GetSCCName()))); len(errs) > 0 {
glog.Errorf("unable to assign SecurityContextConstraints provider: %v", errs)
s.Reason = "CantAssignSecurityContextConstraintProvider"
return false, fmt.Errorf("unable to assign SecurityContextConstraints provider: %v", errs.ToAggregate())
}
ref, err := kapiref.GetReference(legacyscheme.Scheme, constraint)
if err != nil {
s.Reason = "CantObtainReference"
return false, fmt.Errorf("unable to get SecurityContextConstraints reference: %v", err)
}
s.AllowedBy = ref
if len(spec.ServiceAccountName) > 0 {
s.Template.Spec = pod.Spec
}
return true, nil
}