vitess.io/vitess@v0.16.2/go/vt/vtadmin/rbac/rule.go (about)

     1  /*
     2  Copyright 2021 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  	http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package rbac
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"k8s.io/apimachinery/pkg/util/sets"
    23  )
    24  
    25  // Rule is a single rule governing access to a particular resource.
    26  type Rule struct {
    27  	clusters sets.Set[string]
    28  	actions  sets.Set[string]
    29  	subjects sets.Set[string]
    30  }
    31  
    32  // Allows returns true if the actor is allowed to take the specified action in
    33  // the specified cluster.
    34  //
    35  // A nil actor signifies the unauthenticated state, and is only allowed access
    36  // if the rule contains the wildcard ("*") subject.
    37  func (r *Rule) Allows(clusterID string, action Action, actor *Actor) bool {
    38  	if r.clusters.HasAny("*", clusterID) {
    39  		if r.actions.HasAny("*", string(action)) {
    40  			if r.subjects.Has("*") {
    41  				return true
    42  			}
    43  
    44  			if actor == nil {
    45  				return false
    46  			}
    47  
    48  			if r.subjects.Has(fmt.Sprintf("user:%s", actor.Name)) {
    49  				return true
    50  			}
    51  
    52  			for _, role := range actor.Roles {
    53  				if r.subjects.Has(fmt.Sprintf("role:%s", role)) {
    54  					return true
    55  				}
    56  			}
    57  		}
    58  	}
    59  
    60  	return false
    61  }