132 lines
4.4 KiB
Go
132 lines
4.4 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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"fmt"
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"github.com/golang/glog"
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"bytes"
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"k8s.io/apiserver/pkg/authentication/user"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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"k8s.io/kubernetes/pkg/apis/rbac"
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rbacregistryvalidation "k8s.io/kubernetes/pkg/registry/rbac/validation"
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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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authorizationRuleResolver RequestToRuleMapper
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}
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func (r *RBACAuthorizer) Authorize(requestAttributes authorizer.Attributes) (bool, string, error) {
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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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// Build a detailed log of the denial.
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// Make the whole block conditional so we don't do a lot of string-building we won't use.
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if glog.V(2) {
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var operation string
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if requestAttributes.IsResourceRequest() {
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b := &bytes.Buffer{}
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b.WriteString(`"`)
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b.WriteString(requestAttributes.GetVerb())
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b.WriteString(`" resource "`)
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b.WriteString(requestAttributes.GetResource())
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if len(requestAttributes.GetAPIGroup()) > 0 {
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b.WriteString(`.`)
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b.WriteString(requestAttributes.GetAPIGroup())
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}
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if len(requestAttributes.GetSubresource()) > 0 {
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b.WriteString(`/`)
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b.WriteString(requestAttributes.GetSubresource())
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}
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b.WriteString(`"`)
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if len(requestAttributes.GetName()) > 0 {
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b.WriteString(` named "`)
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b.WriteString(requestAttributes.GetName())
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b.WriteString(`"`)
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}
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operation = b.String()
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} else {
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operation = fmt.Sprintf("%q nonResourceURL %q", requestAttributes.GetVerb(), requestAttributes.GetPath())
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}
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var scope string
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if ns := requestAttributes.GetNamespace(); len(ns) > 0 {
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scope = fmt.Sprintf("in namespace %q", ns)
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} else {
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scope = "cluster-wide"
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}
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glog.Infof("RBAC DENY: user %q groups %v cannot %s %s", requestAttributes.GetUser().GetName(), requestAttributes.GetUser().GetGroups(), operation, scope)
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}
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reason := ""
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if ruleResolutionError != nil {
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reason = fmt.Sprintf("%v", ruleResolutionError)
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}
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return false, reason, nil
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}
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func New(roles rbacregistryvalidation.RoleGetter, roleBindings rbacregistryvalidation.RoleBindingLister, clusterRoles rbacregistryvalidation.ClusterRoleGetter, clusterRoleBindings rbacregistryvalidation.ClusterRoleBindingLister) *RBACAuthorizer {
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authorizer := &RBACAuthorizer{
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authorizationRuleResolver: rbacregistryvalidation.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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