/
kubernetes_authz.go
120 lines (100 loc) · 3.39 KB
/
kubernetes_authz.go
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package authorization
import (
gocontext "context"
"fmt"
"strings"
"github.com/kuadrant/authorino/pkg/auth"
"github.com/kuadrant/authorino/pkg/context"
"github.com/kuadrant/authorino/pkg/json"
"github.com/kuadrant/authorino/pkg/log"
kubeAuthz "k8s.io/api/authorization/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
kubeAuthzClient "k8s.io/client-go/kubernetes/typed/authorization/v1"
"k8s.io/client-go/rest"
)
type kubernetesSubjectAccessReviewer interface {
SubjectAccessReviews() kubeAuthzClient.SubjectAccessReviewInterface
}
func NewKubernetesAuthz(user json.JSONValue, groups []string, resourceAttributes *KubernetesAuthzResourceAttributes) (*KubernetesAuthz, error) {
config, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
k8sClient, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return &KubernetesAuthz{
User: user,
Groups: groups,
ResourceAttributes: resourceAttributes,
authorizer: k8sClient.AuthorizationV1(),
}, nil
}
type KubernetesAuthzResourceAttributes struct {
Namespace json.JSONValue
Group json.JSONValue
Resource json.JSONValue
Name json.JSONValue
SubResource json.JSONValue
Verb json.JSONValue
}
type KubernetesAuthz struct {
User json.JSONValue
Groups []string
ResourceAttributes *KubernetesAuthzResourceAttributes
authorizer kubernetesSubjectAccessReviewer
}
func (k *KubernetesAuthz) Call(pipeline auth.AuthPipeline, ctx gocontext.Context) (interface{}, error) {
if err := context.CheckContext(ctx); err != nil {
return false, err
}
authJSON := pipeline.GetAuthorizationJSON()
jsonValueToStr := func(value json.JSONValue) string {
return fmt.Sprintf("%s", value.ResolveFor(authJSON))
}
subjectAccessReview := kubeAuthz.SubjectAccessReview{
Spec: kubeAuthz.SubjectAccessReviewSpec{
User: jsonValueToStr(k.User),
},
}
if k.ResourceAttributes != nil {
resourceAttributes := k.ResourceAttributes
subjectAccessReview.Spec.ResourceAttributes = &kubeAuthz.ResourceAttributes{
Namespace: jsonValueToStr(resourceAttributes.Namespace),
Group: jsonValueToStr(resourceAttributes.Group),
Resource: jsonValueToStr(resourceAttributes.Resource),
Name: jsonValueToStr(resourceAttributes.Name),
Subresource: jsonValueToStr(resourceAttributes.SubResource),
Verb: jsonValueToStr(resourceAttributes.Verb),
}
} else {
request := pipeline.GetHttp()
subjectAccessReview.Spec.NonResourceAttributes = &kubeAuthz.NonResourceAttributes{
Path: request.Path,
Verb: strings.ToLower(request.Method),
}
}
if len(k.Groups) > 0 {
subjectAccessReview.Spec.Groups = k.Groups
}
log.FromContext(ctx).WithName("kubernetesauthz").V(1).Info("calling kubernetes subject access review api", "subjectaccessreview", subjectAccessReview)
if result, err := k.authorizer.SubjectAccessReviews().Create(ctx, &subjectAccessReview, metav1.CreateOptions{}); err != nil {
return false, err
} else {
return parseSubjectAccessReviewResult(result)
}
}
func parseSubjectAccessReviewResult(subjectAccessReview *kubeAuthz.SubjectAccessReview) (bool, error) {
status := subjectAccessReview.Status
if status.Allowed {
return true, nil
} else {
reason := status.Reason
if reason == "" {
reason = "unknown reason"
}
return false, fmt.Errorf("not authorized: %s", reason)
}
}