2c521d7d9a
Automatic merge from submit-queue (batch tested with PRs 49284, 49555, 47639, 49526, 49724) Add clusterroles for approving CSRs easily **What this PR does / why we need it**: Adds ClusterRoles for CSR approving. Currently consumers like kubeadm and GKE have to create these rules by themselves, but are doing it slightly differently which leads to sprawl. Instead, the ClusterRoles are created by core, and the actual bindings created by respective deployment method. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # fixes https://github.com/kubernetes/kubernetes/issues/48191 **Special notes for your reviewer**: **Release note**: ```release-note The API Server now automatically creates RBAC ClusterRoles for CSR approving. Each deployment method should bind users/groups to the ClusterRoles if they are using this feature. ``` cc @kubernetes/sig-auth-pr-reviews @kubernetes/sig-cluster-lifecycle-pr-reviews
421 lines
20 KiB
Go
421 lines
20 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 bootstrappolicy
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import (
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apiserver/pkg/authentication/user"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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rbac "k8s.io/kubernetes/pkg/apis/rbac"
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"k8s.io/kubernetes/pkg/features"
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)
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var (
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ReadWrite = []string{"get", "list", "watch", "create", "update", "patch", "delete", "deletecollection"}
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Read = []string{"get", "list", "watch"}
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Label = map[string]string{"kubernetes.io/bootstrapping": "rbac-defaults"}
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Annotation = map[string]string{rbac.AutoUpdateAnnotationKey: "true"}
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)
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const (
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legacyGroup = ""
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appsGroup = "apps"
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authenticationGroup = "authentication.k8s.io"
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authorizationGroup = "authorization.k8s.io"
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autoscalingGroup = "autoscaling"
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batchGroup = "batch"
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certificatesGroup = "certificates.k8s.io"
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extensionsGroup = "extensions"
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policyGroup = "policy"
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rbacGroup = "rbac.authorization.k8s.io"
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storageGroup = "storage.k8s.io"
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)
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func addDefaultMetadata(obj runtime.Object) {
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metadata, err := meta.Accessor(obj)
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if err != nil {
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// if this happens, then some static code is broken
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panic(err)
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}
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labels := metadata.GetLabels()
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if labels == nil {
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labels = map[string]string{}
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}
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for k, v := range Label {
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labels[k] = v
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}
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metadata.SetLabels(labels)
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annotations := metadata.GetAnnotations()
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if annotations == nil {
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annotations = map[string]string{}
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}
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for k, v := range Annotation {
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annotations[k] = v
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}
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metadata.SetAnnotations(annotations)
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}
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func addClusterRoleLabel(roles []rbac.ClusterRole) {
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for i := range roles {
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addDefaultMetadata(&roles[i])
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}
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return
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}
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func addClusterRoleBindingLabel(rolebindings []rbac.ClusterRoleBinding) {
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for i := range rolebindings {
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addDefaultMetadata(&rolebindings[i])
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}
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return
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}
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func NodeRules() []rbac.PolicyRule {
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return []rbac.PolicyRule{
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// Needed to check API access. These creates are non-mutating
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rbac.NewRule("create").Groups(authenticationGroup).Resources("tokenreviews").RuleOrDie(),
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rbac.NewRule("create").Groups(authorizationGroup).Resources("subjectaccessreviews", "localsubjectaccessreviews").RuleOrDie(),
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// Needed to build serviceLister, to populate env vars for services
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("services").RuleOrDie(),
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// Nodes can register Node API objects and report status.
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// Use the NodeRestriction admission plugin to limit a node to creating/updating its own API object.
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rbac.NewRule("create", "get", "list", "watch").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
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rbac.NewRule("update", "patch").Groups(legacyGroup).Resources("nodes/status").RuleOrDie(),
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rbac.NewRule("update", "patch", "delete").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
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// TODO: restrict to the bound node as creator in the NodeRestrictions admission plugin
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rbac.NewRule("create", "update", "patch").Groups(legacyGroup).Resources("events").RuleOrDie(),
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// TODO: restrict to pods scheduled on the bound node once field selectors are supported by list/watch authorization
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("pods").RuleOrDie(),
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// Needed for the node to create/delete mirror pods.
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// Use the NodeRestriction admission plugin to limit a node to creating/deleting mirror pods bound to itself.
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rbac.NewRule("create", "delete").Groups(legacyGroup).Resources("pods").RuleOrDie(),
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// Needed for the node to report status of pods it is running.
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// Use the NodeRestriction admission plugin to limit a node to updating status of pods bound to itself.
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rbac.NewRule("update").Groups(legacyGroup).Resources("pods/status").RuleOrDie(),
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// Needed for the node to create pod evictions.
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// Use the NodeRestriction admission plugin to limit a node to creating evictions for pods bound to itself.
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rbac.NewRule("create").Groups(legacyGroup).Resources("pods/eviction").RuleOrDie(),
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// Needed for imagepullsecrets, rbd/ceph and secret volumes, and secrets in envs
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// Needed for configmap volume and envs
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// Use the NodeRestriction admission plugin to limit a node to get secrets/configmaps referenced by pods bound to itself.
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rbac.NewRule("get").Groups(legacyGroup).Resources("secrets", "configmaps").RuleOrDie(),
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// Needed for persistent volumes
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// Use the NodeRestriction admission plugin to limit a node to get pv/pvc objects referenced by pods bound to itself.
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rbac.NewRule("get").Groups(legacyGroup).Resources("persistentvolumeclaims", "persistentvolumes").RuleOrDie(),
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// TODO: add to the Node authorizer and restrict to endpoints referenced by pods or PVs bound to the node
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// Needed for glusterfs volumes
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rbac.NewRule("get").Groups(legacyGroup).Resources("endpoints").RuleOrDie(),
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// Used to create a certificatesigningrequest for a node-specific client certificate, and watch
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// for it to be signed. This allows the kubelet to rotate it's own certificate.
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rbac.NewRule("create", "get", "list", "watch").Groups(certificatesGroup).Resources("certificatesigningrequests").RuleOrDie(),
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}
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}
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// ClusterRoles returns the cluster roles to bootstrap an API server with
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func ClusterRoles() []rbac.ClusterRole {
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roles := []rbac.ClusterRole{
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{
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// a "root" role which can do absolutely anything
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ObjectMeta: metav1.ObjectMeta{Name: "cluster-admin"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule("*").Groups("*").Resources("*").RuleOrDie(),
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rbac.NewRule("*").URLs("*").RuleOrDie(),
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},
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},
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{
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// a role which provides just enough power to determine if the server is ready and discover API versions for negotiation
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ObjectMeta: metav1.ObjectMeta{Name: "system:discovery"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule("get").URLs("/healthz", "/version", "/swaggerapi", "/swaggerapi/*", "/api", "/api/*", "/apis", "/apis/*").RuleOrDie(),
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},
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},
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{
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// a role which provides minimal resource access to allow a "normal" user to learn information about themselves
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ObjectMeta: metav1.ObjectMeta{Name: "system:basic-user"},
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Rules: []rbac.PolicyRule{
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// TODO add future selfsubjectrulesreview, project request APIs, project listing APIs
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rbac.NewRule("create").Groups(authorizationGroup).Resources("selfsubjectaccessreviews").RuleOrDie(),
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},
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},
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{
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// a role for a namespace level admin. It is `edit` plus the power to grant permissions to other users.
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ObjectMeta: metav1.ObjectMeta{Name: "admin"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("pods", "pods/attach", "pods/proxy", "pods/exec", "pods/portforward").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts",
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"services", "services/proxy", "endpoints", "persistentvolumeclaims", "configmaps", "secrets").RuleOrDie(),
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("limitranges", "resourcequotas", "bindings", "events",
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"pods/status", "resourcequotas/status", "namespaces/status", "replicationcontrollers/status", "pods/log").RuleOrDie(),
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// read access to namespaces at the namespace scope means you can read *this* namespace. This can be used as an
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// indicator of which namespaces you have access to.
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("namespaces").RuleOrDie(),
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rbac.NewRule("impersonate").Groups(legacyGroup).Resources("serviceaccounts").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(appsGroup).Resources("statefulsets",
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"deployments", "deployments/scale", "deployments/rollback").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(autoscalingGroup).Resources("horizontalpodautoscalers").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(batchGroup).Resources("jobs", "cronjobs", "scheduledjobs").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(extensionsGroup).Resources("daemonsets",
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"deployments", "deployments/scale", "deployments/rollback", "ingresses",
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"replicasets", "replicasets/scale", "replicationcontrollers/scale").RuleOrDie(),
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// additional admin powers
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rbac.NewRule("create").Groups(authorizationGroup).Resources("localsubjectaccessreviews").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(rbacGroup).Resources("roles", "rolebindings").RuleOrDie(),
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},
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},
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{
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// a role for a namespace level editor. It grants access to all user level actions in a namespace.
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// It does not grant powers for "privileged" resources which are domain of the system: `/status`
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// subresources or `quota`/`limits` which are used to control namespaces
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ObjectMeta: metav1.ObjectMeta{Name: "edit"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("pods", "pods/attach", "pods/proxy", "pods/exec", "pods/portforward").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(legacyGroup).Resources("replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts",
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"services", "services/proxy", "endpoints", "persistentvolumeclaims", "configmaps", "secrets").RuleOrDie(),
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("limitranges", "resourcequotas", "bindings", "events",
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"pods/status", "resourcequotas/status", "namespaces/status", "replicationcontrollers/status", "pods/log").RuleOrDie(),
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// read access to namespaces at the namespace scope means you can read *this* namespace. This can be used as an
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// indicator of which namespaces you have access to.
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("namespaces").RuleOrDie(),
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rbac.NewRule("impersonate").Groups(legacyGroup).Resources("serviceaccounts").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(appsGroup).Resources("statefulsets",
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"deployments", "deployments/scale", "deployments/rollback").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(autoscalingGroup).Resources("horizontalpodautoscalers").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(batchGroup).Resources("jobs", "cronjobs", "scheduledjobs").RuleOrDie(),
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rbac.NewRule(ReadWrite...).Groups(extensionsGroup).Resources("daemonsets",
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"deployments", "deployments/scale", "deployments/rollback", "ingresses",
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"replicasets", "replicasets/scale", "replicationcontrollers/scale").RuleOrDie(),
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},
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},
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{
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// a role for namespace level viewing. It grants Read-only access to non-escalating resources in
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// a namespace.
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ObjectMeta: metav1.ObjectMeta{Name: "view"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("pods", "replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts",
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"services", "endpoints", "persistentvolumeclaims", "configmaps").RuleOrDie(),
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("limitranges", "resourcequotas", "bindings", "events",
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"pods/status", "resourcequotas/status", "namespaces/status", "replicationcontrollers/status", "pods/log").RuleOrDie(),
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// read access to namespaces at the namespace scope means you can read *this* namespace. This can be used as an
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// indicator of which namespaces you have access to.
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("namespaces").RuleOrDie(),
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rbac.NewRule(Read...).Groups(appsGroup).Resources("statefulsets", "deployments", "deployments/scale").RuleOrDie(),
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rbac.NewRule(Read...).Groups(autoscalingGroup).Resources("horizontalpodautoscalers").RuleOrDie(),
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rbac.NewRule(Read...).Groups(batchGroup).Resources("jobs", "cronjobs", "scheduledjobs").RuleOrDie(),
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rbac.NewRule(Read...).Groups(extensionsGroup).Resources("daemonsets", "deployments", "deployments/scale",
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"ingresses", "replicasets", "replicasets/scale", "replicationcontrollers/scale").RuleOrDie(),
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},
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},
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{
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// a role to use for heapster's connections back to the API server
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ObjectMeta: metav1.ObjectMeta{Name: "system:heapster"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("events", "pods", "nodes", "namespaces").RuleOrDie(),
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rbac.NewRule(Read...).Groups(extensionsGroup).Resources("deployments").RuleOrDie(),
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},
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},
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{
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// a role for nodes to use to have the access they need for running pods
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ObjectMeta: metav1.ObjectMeta{Name: "system:node"},
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Rules: NodeRules(),
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},
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{
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// a role to use for node-problem-detector access. It does not get bound to default location since
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// deployment locations can reasonably vary.
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ObjectMeta: metav1.ObjectMeta{Name: "system:node-problem-detector"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule("get").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
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rbac.NewRule("patch").Groups(legacyGroup).Resources("nodes/status").RuleOrDie(),
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eventsRule(),
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},
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},
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{
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// a role to use for setting up a proxy
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ObjectMeta: metav1.ObjectMeta{Name: "system:node-proxier"},
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Rules: []rbac.PolicyRule{
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// Used to build serviceLister
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rbac.NewRule("list", "watch").Groups(legacyGroup).Resources("services", "endpoints").RuleOrDie(),
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rbac.NewRule("get").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
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eventsRule(),
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},
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},
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{
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// a role to use for bootstrapping a node's client certificates
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ObjectMeta: metav1.ObjectMeta{Name: "system:node-bootstrapper"},
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Rules: []rbac.PolicyRule{
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// used to create a certificatesigningrequest for a node-specific client certificate, and watch for it to be signed
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rbac.NewRule("create", "get", "list", "watch").Groups(certificatesGroup).Resources("certificatesigningrequests").RuleOrDie(),
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},
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},
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{
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// a role to use for allowing authentication and authorization delegation
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ObjectMeta: metav1.ObjectMeta{Name: "system:auth-delegator"},
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Rules: []rbac.PolicyRule{
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// These creates are non-mutating
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rbac.NewRule("create").Groups(authenticationGroup).Resources("tokenreviews").RuleOrDie(),
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rbac.NewRule("create").Groups(authorizationGroup).Resources("subjectaccessreviews").RuleOrDie(),
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},
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},
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{
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// a role to use for the API registry, summarization, and proxy handling
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ObjectMeta: metav1.ObjectMeta{Name: "system:kube-aggregator"},
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Rules: []rbac.PolicyRule{
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// it needs to see all services so that it knows whether the ones it points to exist or not
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("services", "endpoints").RuleOrDie(),
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},
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},
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{
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// a role to use for bootstrapping the kube-controller-manager so it can create the shared informers
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// service accounts, and secrets that we need to create separate identities for other controllers
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ObjectMeta: metav1.ObjectMeta{Name: "system:kube-controller-manager"},
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Rules: []rbac.PolicyRule{
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eventsRule(),
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rbac.NewRule("create").Groups(legacyGroup).Resources("endpoints", "secrets", "serviceaccounts").RuleOrDie(),
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rbac.NewRule("delete").Groups(legacyGroup).Resources("secrets").RuleOrDie(),
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rbac.NewRule("get").Groups(legacyGroup).Resources("endpoints", "namespaces", "secrets", "serviceaccounts").RuleOrDie(),
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rbac.NewRule("update").Groups(legacyGroup).Resources("endpoints", "secrets", "serviceaccounts").RuleOrDie(),
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// Needed to check API access. These creates are non-mutating
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rbac.NewRule("create").Groups(authenticationGroup).Resources("tokenreviews").RuleOrDie(),
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// Needed for all shared informers
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rbac.NewRule("list", "watch").Groups("*").Resources("*").RuleOrDie(),
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},
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},
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{
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// a role to use for the kube-scheduler
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ObjectMeta: metav1.ObjectMeta{Name: "system:kube-scheduler"},
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Rules: []rbac.PolicyRule{
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eventsRule(),
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// this is for leaderlease access
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// TODO: scope this to the kube-system namespace
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rbac.NewRule("create").Groups(legacyGroup).Resources("endpoints").RuleOrDie(),
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rbac.NewRule("get", "update", "patch", "delete").Groups(legacyGroup).Resources("endpoints").Names("kube-scheduler").RuleOrDie(),
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// fundamental resources
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("nodes", "pods").RuleOrDie(),
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rbac.NewRule("create").Groups(legacyGroup).Resources("pods/binding", "bindings").RuleOrDie(),
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rbac.NewRule("update").Groups(legacyGroup).Resources("pods/status").RuleOrDie(),
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// things that select pods
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("services", "replicationcontrollers").RuleOrDie(),
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rbac.NewRule(Read...).Groups(extensionsGroup).Resources("replicasets").RuleOrDie(),
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rbac.NewRule(Read...).Groups(appsGroup).Resources("statefulsets").RuleOrDie(),
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// things that pods use
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rbac.NewRule(Read...).Groups(legacyGroup).Resources("persistentvolumeclaims", "persistentvolumes").RuleOrDie(),
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},
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},
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{
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// a role to use for the kube-dns pod
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ObjectMeta: metav1.ObjectMeta{Name: "system:kube-dns"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule("list", "watch").Groups(legacyGroup).Resources("endpoints", "services").RuleOrDie(),
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},
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},
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{
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// a role for an external/out-of-tree persistent volume provisioner
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ObjectMeta: metav1.ObjectMeta{Name: "system:persistent-volume-provisioner"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule("get", "list", "watch", "create", "delete").Groups(legacyGroup).Resources("persistentvolumes").RuleOrDie(),
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// update is needed in addition to read access for setting lock annotations on PVCs
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rbac.NewRule("get", "list", "watch", "update").Groups(legacyGroup).Resources("persistentvolumeclaims").RuleOrDie(),
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rbac.NewRule(Read...).Groups(storageGroup).Resources("storageclasses").RuleOrDie(),
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// Needed for watching provisioning success and failure events
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rbac.NewRule("watch").Groups(legacyGroup).Resources("events").RuleOrDie(),
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eventsRule(),
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},
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},
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{
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// a role making the csrapprover controller approve a node client CSR
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ObjectMeta: metav1.ObjectMeta{Name: "system:certificates.k8s.io:certificatesigningrequests:nodeclient"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule("create").Groups(certificatesGroup).Resources("certificatesigningrequests/nodeclient").RuleOrDie(),
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},
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},
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{
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// a role making the csrapprover controller approve a node client CSR requested by the node itself
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ObjectMeta: metav1.ObjectMeta{Name: "system:certificates.k8s.io:certificatesigningrequests:selfnodeclient"},
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Rules: []rbac.PolicyRule{
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rbac.NewRule("create").Groups(certificatesGroup).Resources("certificatesigningrequests/selfnodeclient").RuleOrDie(),
|
|
},
|
|
},
|
|
}
|
|
|
|
if utilfeature.DefaultFeatureGate.Enabled(features.RotateKubeletServerCertificate) {
|
|
roles = append(roles, rbac.ClusterRole{
|
|
// a role making the csrapprover controller approve a node server CSR requested by the node itself
|
|
ObjectMeta: metav1.ObjectMeta{Name: "system:certificates.k8s.io:certificatesigningrequests:selfnodeserver"},
|
|
Rules: []rbac.PolicyRule{
|
|
rbac.NewRule("create").Groups(certificatesGroup).Resources("certificatesigningrequests/selfnodeserver").RuleOrDie(),
|
|
},
|
|
})
|
|
}
|
|
|
|
addClusterRoleLabel(roles)
|
|
return roles
|
|
}
|
|
|
|
const systemNodeRoleName = "system:node"
|
|
|
|
// ClusterRoleBindings return default rolebindings to the default roles
|
|
func ClusterRoleBindings() []rbac.ClusterRoleBinding {
|
|
rolebindings := []rbac.ClusterRoleBinding{
|
|
rbac.NewClusterBinding("cluster-admin").Groups(user.SystemPrivilegedGroup).BindingOrDie(),
|
|
rbac.NewClusterBinding("system:discovery").Groups(user.AllAuthenticated, user.AllUnauthenticated).BindingOrDie(),
|
|
rbac.NewClusterBinding("system:basic-user").Groups(user.AllAuthenticated, user.AllUnauthenticated).BindingOrDie(),
|
|
rbac.NewClusterBinding("system:node-proxier").Users(user.KubeProxy).BindingOrDie(),
|
|
rbac.NewClusterBinding("system:kube-controller-manager").Users(user.KubeControllerManager).BindingOrDie(),
|
|
rbac.NewClusterBinding("system:kube-dns").SAs("kube-system", "kube-dns").BindingOrDie(),
|
|
rbac.NewClusterBinding("system:kube-scheduler").Users(user.KubeScheduler).BindingOrDie(),
|
|
|
|
// This default binding of the system:node role to the system:nodes group is deprecated in 1.7 with the availability of the Node authorizer.
|
|
// This leaves the binding, but with an empty set of subjects, so that tightening reconciliation can remove the subject.
|
|
{
|
|
ObjectMeta: metav1.ObjectMeta{Name: systemNodeRoleName},
|
|
RoleRef: rbac.RoleRef{APIGroup: rbac.GroupName, Kind: "ClusterRole", Name: systemNodeRoleName},
|
|
},
|
|
}
|
|
|
|
addClusterRoleBindingLabel(rolebindings)
|
|
|
|
return rolebindings
|
|
}
|