Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/pkg/registry/rbac/escalation_check.go

@@ -0,0 +1,45 @@
+/*
+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 rbac
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/auth/user"
+)
+
+func EscalationAllowed(ctx api.Context, superUser string) bool {
+	u, ok := api.UserFrom(ctx)
+	if !ok {
+		// the only way to be without a user is to either have no authenticators by explicitly saying that's your preference
+		// or to be connecting via the insecure port, in which case this logically doesn't apply
+		return true
+	}
+
+	// check to see if this subject is allowed to escalate
+	if len(superUser) != 0 && u.GetName() == superUser {
+		return true
+	}
+	// system:masters is special because the API server uses it for privileged loopback connections
+	// therefore we know that a member of system:masters can always do anything
+	for _, group := range u.GetGroups() {
+		if group == user.SystemPrivilegedGroup {
+			return true
+		}
+	}
+
+	return false
+}