90 lines
3.1 KiB
Go
90 lines
3.1 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package rbac implements the authorizer.Authorizer interface using roles base access control.
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package rbac
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import (
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"k8s.io/kubernetes/pkg/apis/rbac"
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"k8s.io/kubernetes/pkg/apis/rbac/validation"
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"k8s.io/kubernetes/pkg/auth/authorizer"
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"k8s.io/kubernetes/pkg/auth/user"
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)
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type RequestToRuleMapper interface {
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// RulesFor returns all known PolicyRules and any errors that happened while locating those rules.
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// Any rule returned is still valid, since rules are deny by default. If you can pass with the rules
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// supplied, you do not have to fail the request. If you cannot, you should indicate the error along
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// with your denial.
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RulesFor(subject user.Info, namespace string) ([]rbac.PolicyRule, error)
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}
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type RBACAuthorizer struct {
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superUser string
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authorizationRuleResolver RequestToRuleMapper
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}
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func (r *RBACAuthorizer) Authorize(requestAttributes authorizer.Attributes) (bool, string, error) {
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if r.superUser != "" && requestAttributes.GetUser() != nil && requestAttributes.GetUser().GetName() == r.superUser {
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return true, "", nil
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}
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rules, ruleResolutionError := r.authorizationRuleResolver.RulesFor(requestAttributes.GetUser(), requestAttributes.GetNamespace())
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if RulesAllow(requestAttributes, rules...) {
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return true, "", nil
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}
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return false, "", ruleResolutionError
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}
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func New(roles validation.RoleGetter, roleBindings validation.RoleBindingLister, clusterRoles validation.ClusterRoleGetter, clusterRoleBindings validation.ClusterRoleBindingLister, superUser string) *RBACAuthorizer {
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authorizer := &RBACAuthorizer{
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superUser: superUser,
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authorizationRuleResolver: validation.NewDefaultRuleResolver(
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roles, roleBindings, clusterRoles, clusterRoleBindings,
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),
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}
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return authorizer
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}
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func RulesAllow(requestAttributes authorizer.Attributes, rules ...rbac.PolicyRule) bool {
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for _, rule := range rules {
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if RuleAllows(requestAttributes, rule) {
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return true
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}
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}
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return false
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}
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func RuleAllows(requestAttributes authorizer.Attributes, rule rbac.PolicyRule) bool {
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if requestAttributes.IsResourceRequest() {
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resource := requestAttributes.GetResource()
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if len(requestAttributes.GetSubresource()) > 0 {
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resource = requestAttributes.GetResource() + "/" + requestAttributes.GetSubresource()
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}
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return rbac.VerbMatches(rule, requestAttributes.GetVerb()) &&
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rbac.APIGroupMatches(rule, requestAttributes.GetAPIGroup()) &&
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rbac.ResourceMatches(rule, resource) &&
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rbac.ResourceNameMatches(rule, requestAttributes.GetName())
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}
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return rbac.VerbMatches(rule, requestAttributes.GetVerb()) &&
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rbac.NonResourceURLMatches(rule, requestAttributes.GetPath())
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}
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